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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
c20555e1 | 5 | * Copyright (c) 2020 Virtuozzo International GmbH. |
5fafdf24 | 6 | * |
fc01f7e7 FB |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
e688df6b | 25 | |
d38ea87a | 26 | #include "qemu/osdep.h" |
0ab8ed18 | 27 | #include "block/trace.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
e2c1c34f | 30 | #include "block/dirty-bitmap.h" |
0c9b70d5 | 31 | #include "block/fuse.h" |
cd7fca95 | 32 | #include "block/nbd.h" |
609f45ea | 33 | #include "block/qdict.h" |
d49b6836 | 34 | #include "qemu/error-report.h" |
5e5733e5 | 35 | #include "block/module_block.h" |
db725815 | 36 | #include "qemu/main-loop.h" |
1de7afc9 | 37 | #include "qemu/module.h" |
e688df6b | 38 | #include "qapi/error.h" |
452fcdbc | 39 | #include "qapi/qmp/qdict.h" |
7b1b5d19 | 40 | #include "qapi/qmp/qjson.h" |
e59a0cf1 | 41 | #include "qapi/qmp/qnull.h" |
fc81fa1e | 42 | #include "qapi/qmp/qstring.h" |
e1d74bc6 KW |
43 | #include "qapi/qobject-output-visitor.h" |
44 | #include "qapi/qapi-visit-block-core.h" | |
bfb197e0 | 45 | #include "sysemu/block-backend.h" |
1de7afc9 | 46 | #include "qemu/notify.h" |
922a01a0 | 47 | #include "qemu/option.h" |
10817bf0 | 48 | #include "qemu/coroutine.h" |
c13163fb | 49 | #include "block/qapi.h" |
1de7afc9 | 50 | #include "qemu/timer.h" |
f348b6d1 VB |
51 | #include "qemu/cutils.h" |
52 | #include "qemu/id.h" | |
0bc329fb HR |
53 | #include "qemu/range.h" |
54 | #include "qemu/rcu.h" | |
21c2283e | 55 | #include "block/coroutines.h" |
fc01f7e7 | 56 | |
71e72a19 | 57 | #ifdef CONFIG_BSD |
7674e7bf | 58 | #include <sys/ioctl.h> |
72cf2d4f | 59 | #include <sys/queue.h> |
feccdcee | 60 | #if defined(HAVE_SYS_DISK_H) |
7674e7bf FB |
61 | #include <sys/disk.h> |
62 | #endif | |
c5e97233 | 63 | #endif |
7674e7bf | 64 | |
49dc768d AL |
65 | #ifdef _WIN32 |
66 | #include <windows.h> | |
67 | #endif | |
68 | ||
1c9805a3 SH |
69 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
70 | ||
3b491a90 | 71 | /* Protected by BQL */ |
dc364f4c BC |
72 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
73 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); | |
74 | ||
3b491a90 | 75 | /* Protected by BQL */ |
2c1d04e0 HR |
76 | static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states = |
77 | QTAILQ_HEAD_INITIALIZER(all_bdrv_states); | |
78 | ||
3b491a90 | 79 | /* Protected by BQL */ |
8a22f02a SH |
80 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
81 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 82 | |
5b363937 HR |
83 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
84 | const char *reference, | |
85 | QDict *options, int flags, | |
86 | BlockDriverState *parent, | |
bd86fb99 | 87 | const BdrvChildClass *child_class, |
272c02ea | 88 | BdrvChildRole child_role, |
5b363937 | 89 | Error **errp); |
f3930ed0 | 90 | |
bfb8aa6d KW |
91 | static bool bdrv_recurse_has_child(BlockDriverState *bs, |
92 | BlockDriverState *child); | |
93 | ||
ad29eb3d KW |
94 | static void GRAPH_WRLOCK |
95 | bdrv_replace_child_noperm(BdrvChild *child, BlockDriverState *new_bs); | |
96 | ||
2f64e1fc KW |
97 | static void GRAPH_WRLOCK |
98 | bdrv_remove_child(BdrvChild *child, Transaction *tran); | |
0978623e | 99 | |
72373e40 VSO |
100 | static int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
101 | BlockReopenQueue *queue, | |
ecd30d2d | 102 | Transaction *change_child_tran, Error **errp); |
53e96d1e VSO |
103 | static void bdrv_reopen_commit(BDRVReopenState *reopen_state); |
104 | static void bdrv_reopen_abort(BDRVReopenState *reopen_state); | |
105 | ||
fa8fc1d0 EGE |
106 | static bool bdrv_backing_overridden(BlockDriverState *bs); |
107 | ||
7e8c182f | 108 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
e08cc001 | 109 | GHashTable *visited, Transaction *tran, |
7e8c182f EGE |
110 | Error **errp); |
111 | ||
eb852011 MA |
112 | /* If non-zero, use only whitelisted block drivers */ |
113 | static int use_bdrv_whitelist; | |
114 | ||
9e0b22f4 SH |
115 | #ifdef _WIN32 |
116 | static int is_windows_drive_prefix(const char *filename) | |
117 | { | |
118 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
119 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
120 | filename[1] == ':'); | |
121 | } | |
122 | ||
123 | int is_windows_drive(const char *filename) | |
124 | { | |
125 | if (is_windows_drive_prefix(filename) && | |
126 | filename[2] == '\0') | |
127 | return 1; | |
128 | if (strstart(filename, "\\\\.\\", NULL) || | |
129 | strstart(filename, "//./", NULL)) | |
130 | return 1; | |
131 | return 0; | |
132 | } | |
133 | #endif | |
134 | ||
339064d5 KW |
135 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
136 | { | |
137 | if (!bs || !bs->drv) { | |
459b4e66 | 138 | /* page size or 4k (hdd sector size) should be on the safe side */ |
8e3b0cbb | 139 | return MAX(4096, qemu_real_host_page_size()); |
339064d5 | 140 | } |
384a48fb | 141 | IO_CODE(); |
339064d5 KW |
142 | |
143 | return bs->bl.opt_mem_alignment; | |
144 | } | |
145 | ||
4196d2f0 DL |
146 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
147 | { | |
148 | if (!bs || !bs->drv) { | |
459b4e66 | 149 | /* page size or 4k (hdd sector size) should be on the safe side */ |
8e3b0cbb | 150 | return MAX(4096, qemu_real_host_page_size()); |
4196d2f0 | 151 | } |
384a48fb | 152 | IO_CODE(); |
4196d2f0 DL |
153 | |
154 | return bs->bl.min_mem_alignment; | |
155 | } | |
156 | ||
9e0b22f4 | 157 | /* check if the path starts with "<protocol>:" */ |
5c98415b | 158 | int path_has_protocol(const char *path) |
9e0b22f4 | 159 | { |
947995c0 PB |
160 | const char *p; |
161 | ||
9e0b22f4 SH |
162 | #ifdef _WIN32 |
163 | if (is_windows_drive(path) || | |
164 | is_windows_drive_prefix(path)) { | |
165 | return 0; | |
166 | } | |
947995c0 PB |
167 | p = path + strcspn(path, ":/\\"); |
168 | #else | |
169 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
170 | #endif |
171 | ||
947995c0 | 172 | return *p == ':'; |
9e0b22f4 SH |
173 | } |
174 | ||
83f64091 | 175 | int path_is_absolute(const char *path) |
3b0d4f61 | 176 | { |
21664424 FB |
177 | #ifdef _WIN32 |
178 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 179 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 180 | return 1; |
f53f4da9 PB |
181 | } |
182 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 183 | #else |
f53f4da9 | 184 | return (*path == '/'); |
3b9f94e1 | 185 | #endif |
3b0d4f61 FB |
186 | } |
187 | ||
009b03aa | 188 | /* if filename is absolute, just return its duplicate. Otherwise, build a |
83f64091 FB |
189 | path to it by considering it is relative to base_path. URL are |
190 | supported. */ | |
009b03aa | 191 | char *path_combine(const char *base_path, const char *filename) |
3b0d4f61 | 192 | { |
009b03aa | 193 | const char *protocol_stripped = NULL; |
83f64091 | 194 | const char *p, *p1; |
009b03aa | 195 | char *result; |
83f64091 FB |
196 | int len; |
197 | ||
83f64091 | 198 | if (path_is_absolute(filename)) { |
009b03aa HR |
199 | return g_strdup(filename); |
200 | } | |
0d54a6fe | 201 | |
009b03aa HR |
202 | if (path_has_protocol(base_path)) { |
203 | protocol_stripped = strchr(base_path, ':'); | |
204 | if (protocol_stripped) { | |
205 | protocol_stripped++; | |
0d54a6fe | 206 | } |
009b03aa HR |
207 | } |
208 | p = protocol_stripped ?: base_path; | |
0d54a6fe | 209 | |
009b03aa | 210 | p1 = strrchr(base_path, '/'); |
3b9f94e1 | 211 | #ifdef _WIN32 |
009b03aa HR |
212 | { |
213 | const char *p2; | |
214 | p2 = strrchr(base_path, '\\'); | |
215 | if (!p1 || p2 > p1) { | |
216 | p1 = p2; | |
3b9f94e1 | 217 | } |
009b03aa | 218 | } |
3b9f94e1 | 219 | #endif |
009b03aa HR |
220 | if (p1) { |
221 | p1++; | |
222 | } else { | |
223 | p1 = base_path; | |
224 | } | |
225 | if (p1 > p) { | |
226 | p = p1; | |
3b0d4f61 | 227 | } |
009b03aa HR |
228 | len = p - base_path; |
229 | ||
230 | result = g_malloc(len + strlen(filename) + 1); | |
231 | memcpy(result, base_path, len); | |
232 | strcpy(result + len, filename); | |
233 | ||
234 | return result; | |
235 | } | |
236 | ||
03c320d8 HR |
237 | /* |
238 | * Helper function for bdrv_parse_filename() implementations to remove optional | |
239 | * protocol prefixes (especially "file:") from a filename and for putting the | |
240 | * stripped filename into the options QDict if there is such a prefix. | |
241 | */ | |
242 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, | |
243 | QDict *options) | |
244 | { | |
245 | if (strstart(filename, prefix, &filename)) { | |
246 | /* Stripping the explicit protocol prefix may result in a protocol | |
247 | * prefix being (wrongly) detected (if the filename contains a colon) */ | |
248 | if (path_has_protocol(filename)) { | |
18cf67c5 | 249 | GString *fat_filename; |
03c320d8 HR |
250 | |
251 | /* This means there is some colon before the first slash; therefore, | |
252 | * this cannot be an absolute path */ | |
253 | assert(!path_is_absolute(filename)); | |
254 | ||
255 | /* And we can thus fix the protocol detection issue by prefixing it | |
256 | * by "./" */ | |
18cf67c5 MA |
257 | fat_filename = g_string_new("./"); |
258 | g_string_append(fat_filename, filename); | |
03c320d8 | 259 | |
18cf67c5 | 260 | assert(!path_has_protocol(fat_filename->str)); |
03c320d8 | 261 | |
18cf67c5 MA |
262 | qdict_put(options, "filename", |
263 | qstring_from_gstring(fat_filename)); | |
03c320d8 HR |
264 | } else { |
265 | /* If no protocol prefix was detected, we can use the shortened | |
266 | * filename as-is */ | |
267 | qdict_put_str(options, "filename", filename); | |
268 | } | |
269 | } | |
270 | } | |
271 | ||
272 | ||
9c5e6594 KW |
273 | /* Returns whether the image file is opened as read-only. Note that this can |
274 | * return false and writing to the image file is still not possible because the | |
275 | * image is inactivated. */ | |
93ed524e JC |
276 | bool bdrv_is_read_only(BlockDriverState *bs) |
277 | { | |
384a48fb | 278 | IO_CODE(); |
975da073 | 279 | return !(bs->open_flags & BDRV_O_RDWR); |
93ed524e JC |
280 | } |
281 | ||
4026f1c4 KW |
282 | static int GRAPH_RDLOCK |
283 | bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, | |
284 | bool ignore_allow_rdw, Error **errp) | |
fe5241bf | 285 | { |
384a48fb EGE |
286 | IO_CODE(); |
287 | ||
e2b8247a JC |
288 | /* Do not set read_only if copy_on_read is enabled */ |
289 | if (bs->copy_on_read && read_only) { | |
290 | error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled", | |
291 | bdrv_get_device_or_node_name(bs)); | |
292 | return -EINVAL; | |
293 | } | |
294 | ||
d6fcdf06 | 295 | /* Do not clear read_only if it is prohibited */ |
54a32bfe KW |
296 | if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && |
297 | !ignore_allow_rdw) | |
298 | { | |
d6fcdf06 JC |
299 | error_setg(errp, "Node '%s' is read only", |
300 | bdrv_get_device_or_node_name(bs)); | |
301 | return -EPERM; | |
302 | } | |
303 | ||
45803a03 JC |
304 | return 0; |
305 | } | |
306 | ||
eaa2410f KW |
307 | /* |
308 | * Called by a driver that can only provide a read-only image. | |
309 | * | |
310 | * Returns 0 if the node is already read-only or it could switch the node to | |
311 | * read-only because BDRV_O_AUTO_RDONLY is set. | |
312 | * | |
313 | * Returns -EACCES if the node is read-write and BDRV_O_AUTO_RDONLY is not set | |
314 | * or bdrv_can_set_read_only() forbids making the node read-only. If @errmsg | |
315 | * is not NULL, it is used as the error message for the Error object. | |
316 | */ | |
317 | int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, | |
318 | Error **errp) | |
45803a03 JC |
319 | { |
320 | int ret = 0; | |
384a48fb | 321 | IO_CODE(); |
45803a03 | 322 | |
eaa2410f KW |
323 | if (!(bs->open_flags & BDRV_O_RDWR)) { |
324 | return 0; | |
325 | } | |
326 | if (!(bs->open_flags & BDRV_O_AUTO_RDONLY)) { | |
327 | goto fail; | |
45803a03 JC |
328 | } |
329 | ||
eaa2410f KW |
330 | ret = bdrv_can_set_read_only(bs, true, false, NULL); |
331 | if (ret < 0) { | |
332 | goto fail; | |
eeae6a59 KW |
333 | } |
334 | ||
eaa2410f KW |
335 | bs->open_flags &= ~BDRV_O_RDWR; |
336 | ||
e2b8247a | 337 | return 0; |
eaa2410f KW |
338 | |
339 | fail: | |
340 | error_setg(errp, "%s", errmsg ?: "Image is read-only"); | |
341 | return -EACCES; | |
fe5241bf JC |
342 | } |
343 | ||
645ae7d8 HR |
344 | /* |
345 | * If @backing is empty, this function returns NULL without setting | |
346 | * @errp. In all other cases, NULL will only be returned with @errp | |
347 | * set. | |
348 | * | |
349 | * Therefore, a return value of NULL without @errp set means that | |
350 | * there is no backing file; if @errp is set, there is one but its | |
351 | * absolute filename cannot be generated. | |
352 | */ | |
353 | char *bdrv_get_full_backing_filename_from_filename(const char *backed, | |
354 | const char *backing, | |
355 | Error **errp) | |
dc5a1371 | 356 | { |
645ae7d8 HR |
357 | if (backing[0] == '\0') { |
358 | return NULL; | |
359 | } else if (path_has_protocol(backing) || path_is_absolute(backing)) { | |
360 | return g_strdup(backing); | |
9f07429e HR |
361 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
362 | error_setg(errp, "Cannot use relative backing file names for '%s'", | |
363 | backed); | |
645ae7d8 | 364 | return NULL; |
dc5a1371 | 365 | } else { |
645ae7d8 | 366 | return path_combine(backed, backing); |
dc5a1371 PB |
367 | } |
368 | } | |
369 | ||
9f4793d8 HR |
370 | /* |
371 | * If @filename is empty or NULL, this function returns NULL without | |
372 | * setting @errp. In all other cases, NULL will only be returned with | |
373 | * @errp set. | |
374 | */ | |
b7cfc7d5 KW |
375 | static char * GRAPH_RDLOCK |
376 | bdrv_make_absolute_filename(BlockDriverState *relative_to, | |
377 | const char *filename, Error **errp) | |
0a82855a | 378 | { |
8df68616 | 379 | char *dir, *full_name; |
9f4793d8 | 380 | |
8df68616 HR |
381 | if (!filename || filename[0] == '\0') { |
382 | return NULL; | |
383 | } else if (path_has_protocol(filename) || path_is_absolute(filename)) { | |
384 | return g_strdup(filename); | |
385 | } | |
9f07429e | 386 | |
8df68616 HR |
387 | dir = bdrv_dirname(relative_to, errp); |
388 | if (!dir) { | |
389 | return NULL; | |
390 | } | |
f30c66ba | 391 | |
8df68616 HR |
392 | full_name = g_strconcat(dir, filename, NULL); |
393 | g_free(dir); | |
394 | return full_name; | |
9f4793d8 HR |
395 | } |
396 | ||
397 | char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp) | |
398 | { | |
f791bf7f | 399 | GLOBAL_STATE_CODE(); |
9f4793d8 | 400 | return bdrv_make_absolute_filename(bs, bs->backing_file, errp); |
0a82855a HR |
401 | } |
402 | ||
0eb7217e SH |
403 | void bdrv_register(BlockDriver *bdrv) |
404 | { | |
a15f08dc | 405 | assert(bdrv->format_name); |
f791bf7f | 406 | GLOBAL_STATE_CODE(); |
8a22f02a | 407 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 408 | } |
b338082b | 409 | |
e4e9986b MA |
410 | BlockDriverState *bdrv_new(void) |
411 | { | |
412 | BlockDriverState *bs; | |
413 | int i; | |
414 | ||
f791bf7f EGE |
415 | GLOBAL_STATE_CODE(); |
416 | ||
5839e53b | 417 | bs = g_new0(BlockDriverState, 1); |
e4654d2d | 418 | QLIST_INIT(&bs->dirty_bitmaps); |
fbe40ff7 FZ |
419 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
420 | QLIST_INIT(&bs->op_blockers[i]); | |
421 | } | |
fa9185fc | 422 | qemu_mutex_init(&bs->reqs_lock); |
2119882c | 423 | qemu_mutex_init(&bs->dirty_bitmap_mutex); |
9fcb0251 | 424 | bs->refcnt = 1; |
dcd04228 | 425 | bs->aio_context = qemu_get_aio_context(); |
d7d512f6 | 426 | |
3ff2f67a EY |
427 | qemu_co_queue_init(&bs->flush_queue); |
428 | ||
0bc329fb HR |
429 | qemu_co_mutex_init(&bs->bsc_modify_lock); |
430 | bs->block_status_cache = g_new0(BdrvBlockStatusCache, 1); | |
431 | ||
0f12264e KW |
432 | for (i = 0; i < bdrv_drain_all_count; i++) { |
433 | bdrv_drained_begin(bs); | |
434 | } | |
435 | ||
2c1d04e0 HR |
436 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
437 | ||
b338082b FB |
438 | return bs; |
439 | } | |
440 | ||
88d88798 | 441 | static BlockDriver *bdrv_do_find_format(const char *format_name) |
ea2384d3 FB |
442 | { |
443 | BlockDriver *drv1; | |
bdb73476 | 444 | GLOBAL_STATE_CODE(); |
88d88798 | 445 | |
8a22f02a SH |
446 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
447 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 448 | return drv1; |
8a22f02a | 449 | } |
ea2384d3 | 450 | } |
88d88798 | 451 | |
ea2384d3 FB |
452 | return NULL; |
453 | } | |
454 | ||
88d88798 MM |
455 | BlockDriver *bdrv_find_format(const char *format_name) |
456 | { | |
457 | BlockDriver *drv1; | |
458 | int i; | |
459 | ||
f791bf7f EGE |
460 | GLOBAL_STATE_CODE(); |
461 | ||
88d88798 MM |
462 | drv1 = bdrv_do_find_format(format_name); |
463 | if (drv1) { | |
464 | return drv1; | |
465 | } | |
466 | ||
467 | /* The driver isn't registered, maybe we need to load a module */ | |
468 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { | |
469 | if (!strcmp(block_driver_modules[i].format_name, format_name)) { | |
c551fb0b CF |
470 | Error *local_err = NULL; |
471 | int rv = block_module_load(block_driver_modules[i].library_name, | |
472 | &local_err); | |
473 | if (rv > 0) { | |
474 | return bdrv_do_find_format(format_name); | |
475 | } else if (rv < 0) { | |
476 | error_report_err(local_err); | |
477 | } | |
88d88798 MM |
478 | break; |
479 | } | |
480 | } | |
c551fb0b | 481 | return NULL; |
88d88798 MM |
482 | } |
483 | ||
9ac404c5 | 484 | static int bdrv_format_is_whitelisted(const char *format_name, bool read_only) |
eb852011 | 485 | { |
b64ec4e4 FZ |
486 | static const char *whitelist_rw[] = { |
487 | CONFIG_BDRV_RW_WHITELIST | |
859aef02 | 488 | NULL |
b64ec4e4 FZ |
489 | }; |
490 | static const char *whitelist_ro[] = { | |
491 | CONFIG_BDRV_RO_WHITELIST | |
859aef02 | 492 | NULL |
eb852011 MA |
493 | }; |
494 | const char **p; | |
495 | ||
b64ec4e4 | 496 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 497 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 498 | } |
eb852011 | 499 | |
b64ec4e4 | 500 | for (p = whitelist_rw; *p; p++) { |
9ac404c5 | 501 | if (!strcmp(format_name, *p)) { |
eb852011 MA |
502 | return 1; |
503 | } | |
504 | } | |
b64ec4e4 FZ |
505 | if (read_only) { |
506 | for (p = whitelist_ro; *p; p++) { | |
9ac404c5 | 507 | if (!strcmp(format_name, *p)) { |
b64ec4e4 FZ |
508 | return 1; |
509 | } | |
510 | } | |
511 | } | |
eb852011 MA |
512 | return 0; |
513 | } | |
514 | ||
9ac404c5 AS |
515 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
516 | { | |
f791bf7f | 517 | GLOBAL_STATE_CODE(); |
9ac404c5 AS |
518 | return bdrv_format_is_whitelisted(drv->format_name, read_only); |
519 | } | |
520 | ||
e6ff69bf DB |
521 | bool bdrv_uses_whitelist(void) |
522 | { | |
523 | return use_bdrv_whitelist; | |
524 | } | |
525 | ||
5b7e1542 ZYW |
526 | typedef struct CreateCo { |
527 | BlockDriver *drv; | |
528 | char *filename; | |
83d0521a | 529 | QemuOpts *opts; |
5b7e1542 | 530 | int ret; |
cc84d90f | 531 | Error *err; |
5b7e1542 ZYW |
532 | } CreateCo; |
533 | ||
741443eb EGE |
534 | int coroutine_fn bdrv_co_create(BlockDriver *drv, const char *filename, |
535 | QemuOpts *opts, Error **errp) | |
5b7e1542 | 536 | { |
cc84d90f | 537 | int ret; |
84bdf21f EGE |
538 | GLOBAL_STATE_CODE(); |
539 | ERRP_GUARD(); | |
540 | ||
541 | if (!drv->bdrv_co_create_opts) { | |
542 | error_setg(errp, "Driver '%s' does not support image creation", | |
543 | drv->format_name); | |
544 | return -ENOTSUP; | |
545 | } | |
546 | ||
547 | ret = drv->bdrv_co_create_opts(drv, filename, opts, errp); | |
548 | if (ret < 0 && !*errp) { | |
549 | error_setg_errno(errp, -ret, "Could not create image"); | |
550 | } | |
cc84d90f | 551 | |
84bdf21f EGE |
552 | return ret; |
553 | } | |
554 | ||
fd17146c HR |
555 | /** |
556 | * Helper function for bdrv_create_file_fallback(): Resize @blk to at | |
557 | * least the given @minimum_size. | |
558 | * | |
559 | * On success, return @blk's actual length. | |
560 | * Otherwise, return -errno. | |
561 | */ | |
84569a7d PB |
562 | static int64_t coroutine_fn GRAPH_UNLOCKED |
563 | create_file_fallback_truncate(BlockBackend *blk, int64_t minimum_size, | |
564 | Error **errp) | |
84a12e66 | 565 | { |
cc84d90f | 566 | Error *local_err = NULL; |
fd17146c | 567 | int64_t size; |
cc84d90f | 568 | int ret; |
84a12e66 | 569 | |
bdb73476 EGE |
570 | GLOBAL_STATE_CODE(); |
571 | ||
84569a7d PB |
572 | ret = blk_co_truncate(blk, minimum_size, false, PREALLOC_MODE_OFF, 0, |
573 | &local_err); | |
fd17146c HR |
574 | if (ret < 0 && ret != -ENOTSUP) { |
575 | error_propagate(errp, local_err); | |
576 | return ret; | |
577 | } | |
578 | ||
84569a7d | 579 | size = blk_co_getlength(blk); |
fd17146c HR |
580 | if (size < 0) { |
581 | error_free(local_err); | |
582 | error_setg_errno(errp, -size, | |
583 | "Failed to inquire the new image file's length"); | |
584 | return size; | |
585 | } | |
586 | ||
587 | if (size < minimum_size) { | |
588 | /* Need to grow the image, but we failed to do that */ | |
589 | error_propagate(errp, local_err); | |
590 | return -ENOTSUP; | |
591 | } | |
592 | ||
593 | error_free(local_err); | |
594 | local_err = NULL; | |
595 | ||
596 | return size; | |
597 | } | |
598 | ||
599 | /** | |
600 | * Helper function for bdrv_create_file_fallback(): Zero the first | |
601 | * sector to remove any potentially pre-existing image header. | |
602 | */ | |
881a4c55 PB |
603 | static int coroutine_fn |
604 | create_file_fallback_zero_first_sector(BlockBackend *blk, | |
605 | int64_t current_size, | |
606 | Error **errp) | |
fd17146c HR |
607 | { |
608 | int64_t bytes_to_clear; | |
609 | int ret; | |
610 | ||
bdb73476 EGE |
611 | GLOBAL_STATE_CODE(); |
612 | ||
fd17146c HR |
613 | bytes_to_clear = MIN(current_size, BDRV_SECTOR_SIZE); |
614 | if (bytes_to_clear) { | |
ce47ff20 | 615 | ret = blk_co_pwrite_zeroes(blk, 0, bytes_to_clear, BDRV_REQ_MAY_UNMAP); |
fd17146c HR |
616 | if (ret < 0) { |
617 | error_setg_errno(errp, -ret, | |
618 | "Failed to clear the new image's first sector"); | |
619 | return ret; | |
620 | } | |
621 | } | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
5a5e7f8c ML |
626 | /** |
627 | * Simple implementation of bdrv_co_create_opts for protocol drivers | |
628 | * which only support creation via opening a file | |
629 | * (usually existing raw storage device) | |
630 | */ | |
631 | int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv, | |
632 | const char *filename, | |
633 | QemuOpts *opts, | |
634 | Error **errp) | |
fd17146c HR |
635 | { |
636 | BlockBackend *blk; | |
eeea1faa | 637 | QDict *options; |
fd17146c HR |
638 | int64_t size = 0; |
639 | char *buf = NULL; | |
640 | PreallocMode prealloc; | |
641 | Error *local_err = NULL; | |
642 | int ret; | |
643 | ||
b4ad82aa EGE |
644 | GLOBAL_STATE_CODE(); |
645 | ||
fd17146c HR |
646 | size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); |
647 | buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); | |
648 | prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, | |
649 | PREALLOC_MODE_OFF, &local_err); | |
650 | g_free(buf); | |
651 | if (local_err) { | |
652 | error_propagate(errp, local_err); | |
653 | return -EINVAL; | |
654 | } | |
655 | ||
656 | if (prealloc != PREALLOC_MODE_OFF) { | |
657 | error_setg(errp, "Unsupported preallocation mode '%s'", | |
658 | PreallocMode_str(prealloc)); | |
659 | return -ENOTSUP; | |
660 | } | |
661 | ||
eeea1faa | 662 | options = qdict_new(); |
fd17146c HR |
663 | qdict_put_str(options, "driver", drv->format_name); |
664 | ||
be1a732c KW |
665 | blk = blk_co_new_open(filename, NULL, options, |
666 | BDRV_O_RDWR | BDRV_O_RESIZE, errp); | |
fd17146c | 667 | if (!blk) { |
81624867 HC |
668 | error_prepend(errp, "Protocol driver '%s' does not support creating " |
669 | "new images, so an existing image must be selected as " | |
670 | "the target; however, opening the given target as an " | |
671 | "existing image failed: ", | |
fd17146c HR |
672 | drv->format_name); |
673 | return -EINVAL; | |
674 | } | |
675 | ||
676 | size = create_file_fallback_truncate(blk, size, errp); | |
677 | if (size < 0) { | |
678 | ret = size; | |
679 | goto out; | |
680 | } | |
681 | ||
682 | ret = create_file_fallback_zero_first_sector(blk, size, errp); | |
683 | if (ret < 0) { | |
684 | goto out; | |
685 | } | |
686 | ||
687 | ret = 0; | |
688 | out: | |
b2ab5f54 | 689 | blk_co_unref(blk); |
fd17146c HR |
690 | return ret; |
691 | } | |
692 | ||
2475a0d0 EGE |
693 | int coroutine_fn bdrv_co_create_file(const char *filename, QemuOpts *opts, |
694 | Error **errp) | |
fd17146c | 695 | { |
729222af | 696 | QemuOpts *protocol_opts; |
fd17146c | 697 | BlockDriver *drv; |
729222af SG |
698 | QDict *qdict; |
699 | int ret; | |
fd17146c | 700 | |
f791bf7f EGE |
701 | GLOBAL_STATE_CODE(); |
702 | ||
b65a5e12 | 703 | drv = bdrv_find_protocol(filename, true, errp); |
84a12e66 | 704 | if (drv == NULL) { |
16905d71 | 705 | return -ENOENT; |
84a12e66 CH |
706 | } |
707 | ||
729222af SG |
708 | if (!drv->create_opts) { |
709 | error_setg(errp, "Driver '%s' does not support image creation", | |
710 | drv->format_name); | |
711 | return -ENOTSUP; | |
712 | } | |
713 | ||
714 | /* | |
715 | * 'opts' contains a QemuOptsList with a combination of format and protocol | |
716 | * default values. | |
717 | * | |
718 | * The format properly removes its options, but the default values remain | |
719 | * in 'opts->list'. So if the protocol has options with the same name | |
720 | * (e.g. rbd has 'cluster_size' as qcow2), it will see the default values | |
721 | * of the format, since for overlapping options, the format wins. | |
722 | * | |
723 | * To avoid this issue, lets convert QemuOpts to QDict, in this way we take | |
724 | * only the set options, and then convert it back to QemuOpts, using the | |
725 | * create_opts of the protocol. So the new QemuOpts, will contain only the | |
726 | * protocol defaults. | |
727 | */ | |
728 | qdict = qemu_opts_to_qdict(opts, NULL); | |
729 | protocol_opts = qemu_opts_from_qdict(drv->create_opts, qdict, errp); | |
730 | if (protocol_opts == NULL) { | |
731 | ret = -EINVAL; | |
732 | goto out; | |
733 | } | |
734 | ||
2475a0d0 | 735 | ret = bdrv_co_create(drv, filename, protocol_opts, errp); |
729222af SG |
736 | out: |
737 | qemu_opts_del(protocol_opts); | |
738 | qobject_unref(qdict); | |
739 | return ret; | |
84a12e66 CH |
740 | } |
741 | ||
e1d7f8bb DHB |
742 | int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp) |
743 | { | |
744 | Error *local_err = NULL; | |
745 | int ret; | |
746 | ||
384a48fb | 747 | IO_CODE(); |
e1d7f8bb | 748 | assert(bs != NULL); |
48aef794 | 749 | assert_bdrv_graph_readable(); |
e1d7f8bb DHB |
750 | |
751 | if (!bs->drv) { | |
752 | error_setg(errp, "Block node '%s' is not opened", bs->filename); | |
753 | return -ENOMEDIUM; | |
754 | } | |
755 | ||
756 | if (!bs->drv->bdrv_co_delete_file) { | |
757 | error_setg(errp, "Driver '%s' does not support image deletion", | |
758 | bs->drv->format_name); | |
759 | return -ENOTSUP; | |
760 | } | |
761 | ||
762 | ret = bs->drv->bdrv_co_delete_file(bs, &local_err); | |
763 | if (ret < 0) { | |
764 | error_propagate(errp, local_err); | |
765 | } | |
766 | ||
767 | return ret; | |
768 | } | |
769 | ||
a890f08e ML |
770 | void coroutine_fn bdrv_co_delete_file_noerr(BlockDriverState *bs) |
771 | { | |
772 | Error *local_err = NULL; | |
773 | int ret; | |
384a48fb | 774 | IO_CODE(); |
a890f08e ML |
775 | |
776 | if (!bs) { | |
777 | return; | |
778 | } | |
779 | ||
780 | ret = bdrv_co_delete_file(bs, &local_err); | |
781 | /* | |
782 | * ENOTSUP will happen if the block driver doesn't support | |
783 | * the 'bdrv_co_delete_file' interface. This is a predictable | |
784 | * scenario and shouldn't be reported back to the user. | |
785 | */ | |
786 | if (ret == -ENOTSUP) { | |
787 | error_free(local_err); | |
788 | } else if (ret < 0) { | |
789 | error_report_err(local_err); | |
790 | } | |
791 | } | |
792 | ||
892b7de8 ET |
793 | /** |
794 | * Try to get @bs's logical and physical block size. | |
795 | * On success, store them in @bsz struct and return 0. | |
796 | * On failure return -errno. | |
797 | * @bs must not be empty. | |
798 | */ | |
799 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) | |
800 | { | |
801 | BlockDriver *drv = bs->drv; | |
93393e69 | 802 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
f791bf7f | 803 | GLOBAL_STATE_CODE(); |
892b7de8 ET |
804 | |
805 | if (drv && drv->bdrv_probe_blocksizes) { | |
806 | return drv->bdrv_probe_blocksizes(bs, bsz); | |
93393e69 HR |
807 | } else if (filtered) { |
808 | return bdrv_probe_blocksizes(filtered, bsz); | |
892b7de8 ET |
809 | } |
810 | ||
811 | return -ENOTSUP; | |
812 | } | |
813 | ||
814 | /** | |
815 | * Try to get @bs's geometry (cyls, heads, sectors). | |
816 | * On success, store them in @geo struct and return 0. | |
817 | * On failure return -errno. | |
818 | * @bs must not be empty. | |
819 | */ | |
820 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) | |
821 | { | |
822 | BlockDriver *drv = bs->drv; | |
f5a3a270 KW |
823 | BlockDriverState *filtered; |
824 | ||
f791bf7f | 825 | GLOBAL_STATE_CODE(); |
f5a3a270 | 826 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
892b7de8 ET |
827 | |
828 | if (drv && drv->bdrv_probe_geometry) { | |
829 | return drv->bdrv_probe_geometry(bs, geo); | |
f5a3a270 KW |
830 | } |
831 | ||
832 | filtered = bdrv_filter_bs(bs); | |
833 | if (filtered) { | |
93393e69 | 834 | return bdrv_probe_geometry(filtered, geo); |
892b7de8 ET |
835 | } |
836 | ||
837 | return -ENOTSUP; | |
838 | } | |
839 | ||
eba25057 JM |
840 | /* |
841 | * Create a uniquely-named empty temporary file. | |
69fbfff9 BM |
842 | * Return the actual file name used upon success, otherwise NULL. |
843 | * This string should be freed with g_free() when not needed any longer. | |
844 | * | |
845 | * Note: creating a temporary file for the caller to (re)open is | |
846 | * inherently racy. Use g_file_open_tmp() instead whenever practical. | |
eba25057 | 847 | */ |
69fbfff9 | 848 | char *create_tmp_file(Error **errp) |
d5249393 | 849 | { |
67b915a5 | 850 | int fd; |
7ccfb2eb | 851 | const char *tmpdir; |
69fbfff9 BM |
852 | g_autofree char *filename = NULL; |
853 | ||
854 | tmpdir = g_get_tmp_dir(); | |
855 | #ifndef _WIN32 | |
856 | /* | |
857 | * See commit 69bef79 ("block: use /var/tmp instead of /tmp for -snapshot") | |
858 | * | |
859 | * This function is used to create temporary disk images (like -snapshot), | |
860 | * so the files can become very large. /tmp is often a tmpfs where as | |
861 | * /var/tmp is usually on a disk, so more appropriate for disk images. | |
862 | */ | |
863 | if (!g_strcmp0(tmpdir, "/tmp")) { | |
69bef793 AS |
864 | tmpdir = "/var/tmp"; |
865 | } | |
69fbfff9 BM |
866 | #endif |
867 | ||
868 | filename = g_strdup_printf("%s/vl.XXXXXX", tmpdir); | |
869 | fd = g_mkstemp(filename); | |
fe235a06 | 870 | if (fd < 0) { |
69fbfff9 BM |
871 | error_setg_errno(errp, errno, "Could not open temporary file '%s'", |
872 | filename); | |
873 | return NULL; | |
eba25057 | 874 | } |
6b6471ee | 875 | close(fd); |
69fbfff9 BM |
876 | |
877 | return g_steal_pointer(&filename); | |
eba25057 | 878 | } |
fc01f7e7 | 879 | |
84a12e66 CH |
880 | /* |
881 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
882 | * recognized as a host CDROM. | |
883 | */ | |
884 | static BlockDriver *find_hdev_driver(const char *filename) | |
885 | { | |
886 | int score_max = 0, score; | |
887 | BlockDriver *drv = NULL, *d; | |
bdb73476 | 888 | GLOBAL_STATE_CODE(); |
84a12e66 CH |
889 | |
890 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
891 | if (d->bdrv_probe_device) { | |
892 | score = d->bdrv_probe_device(filename); | |
893 | if (score > score_max) { | |
894 | score_max = score; | |
895 | drv = d; | |
896 | } | |
897 | } | |
898 | } | |
899 | ||
900 | return drv; | |
901 | } | |
902 | ||
88d88798 MM |
903 | static BlockDriver *bdrv_do_find_protocol(const char *protocol) |
904 | { | |
905 | BlockDriver *drv1; | |
bdb73476 | 906 | GLOBAL_STATE_CODE(); |
88d88798 MM |
907 | |
908 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
909 | if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) { | |
910 | return drv1; | |
911 | } | |
912 | } | |
913 | ||
914 | return NULL; | |
915 | } | |
916 | ||
98289620 | 917 | BlockDriver *bdrv_find_protocol(const char *filename, |
b65a5e12 HR |
918 | bool allow_protocol_prefix, |
919 | Error **errp) | |
83f64091 FB |
920 | { |
921 | BlockDriver *drv1; | |
922 | char protocol[128]; | |
1cec71e3 | 923 | int len; |
83f64091 | 924 | const char *p; |
88d88798 | 925 | int i; |
19cb3738 | 926 | |
f791bf7f | 927 | GLOBAL_STATE_CODE(); |
66f82cee KW |
928 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
929 | ||
39508e7a CH |
930 | /* |
931 | * XXX(hch): we really should not let host device detection | |
932 | * override an explicit protocol specification, but moving this | |
933 | * later breaks access to device names with colons in them. | |
934 | * Thanks to the brain-dead persistent naming schemes on udev- | |
935 | * based Linux systems those actually are quite common. | |
936 | */ | |
937 | drv1 = find_hdev_driver(filename); | |
938 | if (drv1) { | |
939 | return drv1; | |
940 | } | |
941 | ||
98289620 | 942 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
ef810437 | 943 | return &bdrv_file; |
84a12e66 | 944 | } |
98289620 | 945 | |
9e0b22f4 SH |
946 | p = strchr(filename, ':'); |
947 | assert(p != NULL); | |
1cec71e3 AL |
948 | len = p - filename; |
949 | if (len > sizeof(protocol) - 1) | |
950 | len = sizeof(protocol) - 1; | |
951 | memcpy(protocol, filename, len); | |
952 | protocol[len] = '\0'; | |
88d88798 MM |
953 | |
954 | drv1 = bdrv_do_find_protocol(protocol); | |
955 | if (drv1) { | |
956 | return drv1; | |
957 | } | |
958 | ||
959 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { | |
960 | if (block_driver_modules[i].protocol_name && | |
961 | !strcmp(block_driver_modules[i].protocol_name, protocol)) { | |
c551fb0b CF |
962 | int rv = block_module_load(block_driver_modules[i].library_name, errp); |
963 | if (rv > 0) { | |
964 | drv1 = bdrv_do_find_protocol(protocol); | |
965 | } else if (rv < 0) { | |
966 | return NULL; | |
967 | } | |
88d88798 | 968 | break; |
8a22f02a | 969 | } |
83f64091 | 970 | } |
b65a5e12 | 971 | |
88d88798 MM |
972 | if (!drv1) { |
973 | error_setg(errp, "Unknown protocol '%s'", protocol); | |
974 | } | |
975 | return drv1; | |
83f64091 FB |
976 | } |
977 | ||
c6684249 MA |
978 | /* |
979 | * Guess image format by probing its contents. | |
980 | * This is not a good idea when your image is raw (CVE-2008-2004), but | |
981 | * we do it anyway for backward compatibility. | |
982 | * | |
983 | * @buf contains the image's first @buf_size bytes. | |
7cddd372 KW |
984 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
985 | * but can be smaller if the image file is smaller) | |
c6684249 MA |
986 | * @filename is its filename. |
987 | * | |
988 | * For all block drivers, call the bdrv_probe() method to get its | |
989 | * probing score. | |
990 | * Return the first block driver with the highest probing score. | |
991 | */ | |
38f3ef57 KW |
992 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
993 | const char *filename) | |
c6684249 MA |
994 | { |
995 | int score_max = 0, score; | |
996 | BlockDriver *drv = NULL, *d; | |
967d7905 | 997 | IO_CODE(); |
c6684249 MA |
998 | |
999 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
1000 | if (d->bdrv_probe) { | |
1001 | score = d->bdrv_probe(buf, buf_size, filename); | |
1002 | if (score > score_max) { | |
1003 | score_max = score; | |
1004 | drv = d; | |
1005 | } | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | return drv; | |
1010 | } | |
1011 | ||
5696c6e3 | 1012 | static int find_image_format(BlockBackend *file, const char *filename, |
34b5d2c6 | 1013 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 1014 | { |
c6684249 | 1015 | BlockDriver *drv; |
7cddd372 | 1016 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
f500a6d3 | 1017 | int ret = 0; |
f8ea0b00 | 1018 | |
bdb73476 EGE |
1019 | GLOBAL_STATE_CODE(); |
1020 | ||
08a00559 | 1021 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
5696c6e3 | 1022 | if (blk_is_sg(file) || !blk_is_inserted(file) || blk_getlength(file) == 0) { |
ef810437 | 1023 | *pdrv = &bdrv_raw; |
c98ac35d | 1024 | return ret; |
1a396859 | 1025 | } |
f8ea0b00 | 1026 | |
a9262f55 | 1027 | ret = blk_pread(file, 0, sizeof(buf), buf, 0); |
83f64091 | 1028 | if (ret < 0) { |
34b5d2c6 HR |
1029 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
1030 | "format"); | |
c98ac35d SW |
1031 | *pdrv = NULL; |
1032 | return ret; | |
83f64091 FB |
1033 | } |
1034 | ||
bf5b16fa | 1035 | drv = bdrv_probe_all(buf, sizeof(buf), filename); |
c98ac35d | 1036 | if (!drv) { |
34b5d2c6 HR |
1037 | error_setg(errp, "Could not determine image format: No compatible " |
1038 | "driver found"); | |
bf5b16fa AF |
1039 | *pdrv = NULL; |
1040 | return -ENOENT; | |
c98ac35d | 1041 | } |
bf5b16fa | 1042 | |
c98ac35d | 1043 | *pdrv = drv; |
bf5b16fa | 1044 | return 0; |
ea2384d3 FB |
1045 | } |
1046 | ||
51762288 SH |
1047 | /** |
1048 | * Set the current 'total_sectors' value | |
65a9bb25 | 1049 | * Return 0 on success, -errno on error. |
51762288 | 1050 | */ |
c86422c5 EGE |
1051 | int coroutine_fn bdrv_co_refresh_total_sectors(BlockDriverState *bs, |
1052 | int64_t hint) | |
51762288 SH |
1053 | { |
1054 | BlockDriver *drv = bs->drv; | |
967d7905 | 1055 | IO_CODE(); |
8ab8140a | 1056 | assert_bdrv_graph_readable(); |
51762288 | 1057 | |
d470ad42 HR |
1058 | if (!drv) { |
1059 | return -ENOMEDIUM; | |
1060 | } | |
1061 | ||
c86422c5 | 1062 | /* Do not attempt drv->bdrv_co_getlength() on scsi-generic devices */ |
b192af8a | 1063 | if (bdrv_is_sg(bs)) |
396759ad NB |
1064 | return 0; |
1065 | ||
51762288 | 1066 | /* query actual device if possible, otherwise just trust the hint */ |
c86422c5 EGE |
1067 | if (drv->bdrv_co_getlength) { |
1068 | int64_t length = drv->bdrv_co_getlength(bs); | |
51762288 SH |
1069 | if (length < 0) { |
1070 | return length; | |
1071 | } | |
7e382003 | 1072 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
1073 | } |
1074 | ||
1075 | bs->total_sectors = hint; | |
8b117001 VSO |
1076 | |
1077 | if (bs->total_sectors * BDRV_SECTOR_SIZE > BDRV_MAX_LENGTH) { | |
1078 | return -EFBIG; | |
1079 | } | |
1080 | ||
51762288 SH |
1081 | return 0; |
1082 | } | |
1083 | ||
cddff5ba KW |
1084 | /** |
1085 | * Combines a QDict of new block driver @options with any missing options taken | |
1086 | * from @old_options, so that leaving out an option defaults to its old value. | |
1087 | */ | |
1088 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, | |
1089 | QDict *old_options) | |
1090 | { | |
da359909 | 1091 | GLOBAL_STATE_CODE(); |
cddff5ba KW |
1092 | if (bs->drv && bs->drv->bdrv_join_options) { |
1093 | bs->drv->bdrv_join_options(options, old_options); | |
1094 | } else { | |
1095 | qdict_join(options, old_options, false); | |
1096 | } | |
1097 | } | |
1098 | ||
543770bd AG |
1099 | static BlockdevDetectZeroesOptions bdrv_parse_detect_zeroes(QemuOpts *opts, |
1100 | int open_flags, | |
1101 | Error **errp) | |
1102 | { | |
1103 | Error *local_err = NULL; | |
1104 | char *value = qemu_opt_get_del(opts, "detect-zeroes"); | |
1105 | BlockdevDetectZeroesOptions detect_zeroes = | |
1106 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, value, | |
1107 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, &local_err); | |
bdb73476 | 1108 | GLOBAL_STATE_CODE(); |
543770bd AG |
1109 | g_free(value); |
1110 | if (local_err) { | |
1111 | error_propagate(errp, local_err); | |
1112 | return detect_zeroes; | |
1113 | } | |
1114 | ||
1115 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && | |
1116 | !(open_flags & BDRV_O_UNMAP)) | |
1117 | { | |
1118 | error_setg(errp, "setting detect-zeroes to unmap is not allowed " | |
1119 | "without setting discard operation to unmap"); | |
1120 | } | |
1121 | ||
1122 | return detect_zeroes; | |
1123 | } | |
1124 | ||
f80f2673 AM |
1125 | /** |
1126 | * Set open flags for aio engine | |
1127 | * | |
1128 | * Return 0 on success, -1 if the engine specified is invalid | |
1129 | */ | |
1130 | int bdrv_parse_aio(const char *mode, int *flags) | |
1131 | { | |
1132 | if (!strcmp(mode, "threads")) { | |
1133 | /* do nothing, default */ | |
1134 | } else if (!strcmp(mode, "native")) { | |
1135 | *flags |= BDRV_O_NATIVE_AIO; | |
1136 | #ifdef CONFIG_LINUX_IO_URING | |
1137 | } else if (!strcmp(mode, "io_uring")) { | |
1138 | *flags |= BDRV_O_IO_URING; | |
1139 | #endif | |
1140 | } else { | |
1141 | return -1; | |
1142 | } | |
1143 | ||
1144 | return 0; | |
1145 | } | |
1146 | ||
9e8f1835 PB |
1147 | /** |
1148 | * Set open flags for a given discard mode | |
1149 | * | |
1150 | * Return 0 on success, -1 if the discard mode was invalid. | |
1151 | */ | |
1152 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
1153 | { | |
1154 | *flags &= ~BDRV_O_UNMAP; | |
1155 | ||
1156 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
1157 | /* do nothing */ | |
1158 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
1159 | *flags |= BDRV_O_UNMAP; | |
1160 | } else { | |
1161 | return -1; | |
1162 | } | |
1163 | ||
1164 | return 0; | |
1165 | } | |
1166 | ||
c3993cdc SH |
1167 | /** |
1168 | * Set open flags for a given cache mode | |
1169 | * | |
1170 | * Return 0 on success, -1 if the cache mode was invalid. | |
1171 | */ | |
53e8ae01 | 1172 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) |
c3993cdc SH |
1173 | { |
1174 | *flags &= ~BDRV_O_CACHE_MASK; | |
1175 | ||
1176 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
53e8ae01 KW |
1177 | *writethrough = false; |
1178 | *flags |= BDRV_O_NOCACHE; | |
92196b2f | 1179 | } else if (!strcmp(mode, "directsync")) { |
53e8ae01 | 1180 | *writethrough = true; |
92196b2f | 1181 | *flags |= BDRV_O_NOCACHE; |
c3993cdc | 1182 | } else if (!strcmp(mode, "writeback")) { |
53e8ae01 | 1183 | *writethrough = false; |
c3993cdc | 1184 | } else if (!strcmp(mode, "unsafe")) { |
53e8ae01 | 1185 | *writethrough = false; |
c3993cdc SH |
1186 | *flags |= BDRV_O_NO_FLUSH; |
1187 | } else if (!strcmp(mode, "writethrough")) { | |
53e8ae01 | 1188 | *writethrough = true; |
c3993cdc SH |
1189 | } else { |
1190 | return -1; | |
1191 | } | |
1192 | ||
1193 | return 0; | |
1194 | } | |
1195 | ||
b5411555 KW |
1196 | static char *bdrv_child_get_parent_desc(BdrvChild *c) |
1197 | { | |
1198 | BlockDriverState *parent = c->opaque; | |
2c0a3acb | 1199 | return g_strdup_printf("node '%s'", bdrv_get_node_name(parent)); |
b5411555 KW |
1200 | } |
1201 | ||
d05ab380 | 1202 | static void GRAPH_RDLOCK bdrv_child_cb_drained_begin(BdrvChild *child) |
20018e12 KW |
1203 | { |
1204 | BlockDriverState *bs = child->opaque; | |
a82a3bd1 | 1205 | bdrv_do_drained_begin_quiesce(bs, NULL); |
20018e12 KW |
1206 | } |
1207 | ||
d05ab380 | 1208 | static bool GRAPH_RDLOCK bdrv_child_cb_drained_poll(BdrvChild *child) |
89bd0305 KW |
1209 | { |
1210 | BlockDriverState *bs = child->opaque; | |
299403ae | 1211 | return bdrv_drain_poll(bs, NULL, false); |
89bd0305 KW |
1212 | } |
1213 | ||
d05ab380 | 1214 | static void GRAPH_RDLOCK bdrv_child_cb_drained_end(BdrvChild *child) |
20018e12 KW |
1215 | { |
1216 | BlockDriverState *bs = child->opaque; | |
2f65df6e | 1217 | bdrv_drained_end(bs); |
20018e12 KW |
1218 | } |
1219 | ||
38701b6a KW |
1220 | static int bdrv_child_cb_inactivate(BdrvChild *child) |
1221 | { | |
1222 | BlockDriverState *bs = child->opaque; | |
bdb73476 | 1223 | GLOBAL_STATE_CODE(); |
38701b6a KW |
1224 | assert(bs->open_flags & BDRV_O_INACTIVE); |
1225 | return 0; | |
1226 | } | |
1227 | ||
27633e74 EGE |
1228 | static bool bdrv_child_cb_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
1229 | GHashTable *visited, Transaction *tran, | |
1230 | Error **errp) | |
53a7d041 KW |
1231 | { |
1232 | BlockDriverState *bs = child->opaque; | |
27633e74 | 1233 | return bdrv_change_aio_context(bs, ctx, visited, tran, errp); |
53a7d041 KW |
1234 | } |
1235 | ||
b1e6fc08 | 1236 | /* |
73176bee KW |
1237 | * Returns the options and flags that a temporary snapshot should get, based on |
1238 | * the originally requested flags (the originally requested image will have | |
1239 | * flags like a backing file) | |
b1e6fc08 | 1240 | */ |
73176bee KW |
1241 | static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, |
1242 | int parent_flags, QDict *parent_options) | |
b1e6fc08 | 1243 | { |
bdb73476 | 1244 | GLOBAL_STATE_CODE(); |
73176bee KW |
1245 | *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
1246 | ||
1247 | /* For temporary files, unconditional cache=unsafe is fine */ | |
73176bee KW |
1248 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); |
1249 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); | |
41869044 | 1250 | |
3f48686f | 1251 | /* Copy the read-only and discard options from the parent */ |
f87a0e29 | 1252 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
3f48686f | 1253 | qdict_copy_default(child_options, parent_options, BDRV_OPT_DISCARD); |
f87a0e29 | 1254 | |
41869044 KW |
1255 | /* aio=native doesn't work for cache.direct=off, so disable it for the |
1256 | * temporary snapshot */ | |
1257 | *child_flags &= ~BDRV_O_NATIVE_AIO; | |
b1e6fc08 KW |
1258 | } |
1259 | ||
b7cfc7d5 | 1260 | static void GRAPH_WRLOCK bdrv_backing_attach(BdrvChild *c) |
db95dbba KW |
1261 | { |
1262 | BlockDriverState *parent = c->opaque; | |
1263 | BlockDriverState *backing_hd = c->bs; | |
1264 | ||
bdb73476 | 1265 | GLOBAL_STATE_CODE(); |
db95dbba KW |
1266 | assert(!parent->backing_blocker); |
1267 | error_setg(&parent->backing_blocker, | |
1268 | "node is used as backing hd of '%s'", | |
1269 | bdrv_get_device_or_node_name(parent)); | |
1270 | ||
f30c66ba HR |
1271 | bdrv_refresh_filename(backing_hd); |
1272 | ||
db95dbba | 1273 | parent->open_flags &= ~BDRV_O_NO_BACKING; |
db95dbba KW |
1274 | |
1275 | bdrv_op_block_all(backing_hd, parent->backing_blocker); | |
1276 | /* Otherwise we won't be able to commit or stream */ | |
1277 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, | |
1278 | parent->backing_blocker); | |
1279 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, | |
1280 | parent->backing_blocker); | |
1281 | /* | |
1282 | * We do backup in 3 ways: | |
1283 | * 1. drive backup | |
1284 | * The target bs is new opened, and the source is top BDS | |
1285 | * 2. blockdev backup | |
1286 | * Both the source and the target are top BDSes. | |
1287 | * 3. internal backup(used for block replication) | |
1288 | * Both the source and the target are backing file | |
1289 | * | |
1290 | * In case 1 and 2, neither the source nor the target is the backing file. | |
1291 | * In case 3, we will block the top BDS, so there is only one block job | |
1292 | * for the top BDS and its backing chain. | |
1293 | */ | |
1294 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, | |
1295 | parent->backing_blocker); | |
1296 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, | |
1297 | parent->backing_blocker); | |
ca2f1234 | 1298 | } |
d736f119 | 1299 | |
db95dbba KW |
1300 | static void bdrv_backing_detach(BdrvChild *c) |
1301 | { | |
1302 | BlockDriverState *parent = c->opaque; | |
1303 | ||
bdb73476 | 1304 | GLOBAL_STATE_CODE(); |
db95dbba KW |
1305 | assert(parent->backing_blocker); |
1306 | bdrv_op_unblock_all(c->bs, parent->backing_blocker); | |
1307 | error_free(parent->backing_blocker); | |
1308 | parent->backing_blocker = NULL; | |
48e08288 | 1309 | } |
d736f119 | 1310 | |
6858eba0 KW |
1311 | static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base, |
1312 | const char *filename, Error **errp) | |
1313 | { | |
1314 | BlockDriverState *parent = c->opaque; | |
e94d3dba | 1315 | bool read_only = bdrv_is_read_only(parent); |
6858eba0 | 1316 | int ret; |
bdb73476 | 1317 | GLOBAL_STATE_CODE(); |
6858eba0 | 1318 | |
e94d3dba AG |
1319 | if (read_only) { |
1320 | ret = bdrv_reopen_set_read_only(parent, false, errp); | |
61f09cea KW |
1321 | if (ret < 0) { |
1322 | return ret; | |
1323 | } | |
1324 | } | |
1325 | ||
6858eba0 | 1326 | ret = bdrv_change_backing_file(parent, filename, |
e54ee1b3 EB |
1327 | base->drv ? base->drv->format_name : "", |
1328 | false); | |
6858eba0 | 1329 | if (ret < 0) { |
64730694 | 1330 | error_setg_errno(errp, -ret, "Could not update backing file link"); |
6858eba0 KW |
1331 | } |
1332 | ||
e94d3dba AG |
1333 | if (read_only) { |
1334 | bdrv_reopen_set_read_only(parent, true, NULL); | |
61f09cea KW |
1335 | } |
1336 | ||
6858eba0 KW |
1337 | return ret; |
1338 | } | |
1339 | ||
fae8bd39 HR |
1340 | /* |
1341 | * Returns the options and flags that a generic child of a BDS should | |
1342 | * get, based on the given options and flags for the parent BDS. | |
1343 | */ | |
00ff7ffd HR |
1344 | static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format, |
1345 | int *child_flags, QDict *child_options, | |
1346 | int parent_flags, QDict *parent_options) | |
fae8bd39 HR |
1347 | { |
1348 | int flags = parent_flags; | |
bdb73476 | 1349 | GLOBAL_STATE_CODE(); |
fae8bd39 HR |
1350 | |
1351 | /* | |
1352 | * First, decide whether to set, clear, or leave BDRV_O_PROTOCOL. | |
1353 | * Generally, the question to answer is: Should this child be | |
1354 | * format-probed by default? | |
1355 | */ | |
1356 | ||
1357 | /* | |
1358 | * Pure and non-filtered data children of non-format nodes should | |
1359 | * be probed by default (even when the node itself has BDRV_O_PROTOCOL | |
1360 | * set). This only affects a very limited set of drivers (namely | |
1361 | * quorum and blkverify when this comment was written). | |
1362 | * Force-clear BDRV_O_PROTOCOL then. | |
1363 | */ | |
1364 | if (!parent_is_format && | |
1365 | (role & BDRV_CHILD_DATA) && | |
1366 | !(role & (BDRV_CHILD_METADATA | BDRV_CHILD_FILTERED))) | |
1367 | { | |
1368 | flags &= ~BDRV_O_PROTOCOL; | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * All children of format nodes (except for COW children) and all | |
1373 | * metadata children in general should never be format-probed. | |
1374 | * Force-set BDRV_O_PROTOCOL then. | |
1375 | */ | |
1376 | if ((parent_is_format && !(role & BDRV_CHILD_COW)) || | |
1377 | (role & BDRV_CHILD_METADATA)) | |
1378 | { | |
1379 | flags |= BDRV_O_PROTOCOL; | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * If the cache mode isn't explicitly set, inherit direct and no-flush from | |
1384 | * the parent. | |
1385 | */ | |
1386 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); | |
1387 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); | |
1388 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); | |
1389 | ||
1390 | if (role & BDRV_CHILD_COW) { | |
1391 | /* backing files are opened read-only by default */ | |
1392 | qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); | |
1393 | qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off"); | |
1394 | } else { | |
1395 | /* Inherit the read-only option from the parent if it's not set */ | |
1396 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); | |
1397 | qdict_copy_default(child_options, parent_options, | |
1398 | BDRV_OPT_AUTO_READ_ONLY); | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * bdrv_co_pdiscard() respects unmap policy for the parent, so we | |
1403 | * can default to enable it on lower layers regardless of the | |
1404 | * parent option. | |
1405 | */ | |
1406 | qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap"); | |
1407 | ||
1408 | /* Clear flags that only apply to the top layer */ | |
1409 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); | |
1410 | ||
1411 | if (role & BDRV_CHILD_METADATA) { | |
1412 | flags &= ~BDRV_O_NO_IO; | |
1413 | } | |
1414 | if (role & BDRV_CHILD_COW) { | |
1415 | flags &= ~BDRV_O_TEMPORARY; | |
1416 | } | |
1417 | ||
1418 | *child_flags = flags; | |
1419 | } | |
1420 | ||
303de47b | 1421 | static void GRAPH_WRLOCK bdrv_child_cb_attach(BdrvChild *child) |
ca2f1234 HR |
1422 | { |
1423 | BlockDriverState *bs = child->opaque; | |
1424 | ||
3f35f82e | 1425 | assert_bdrv_graph_writable(); |
a225369b | 1426 | QLIST_INSERT_HEAD(&bs->children, child, next); |
5bb04747 VSO |
1427 | if (bs->drv->is_filter || (child->role & BDRV_CHILD_FILTERED)) { |
1428 | /* | |
1429 | * Here we handle filters and block/raw-format.c when it behave like | |
1430 | * filter. They generally have a single PRIMARY child, which is also the | |
1431 | * FILTERED child, and that they may have multiple more children, which | |
1432 | * are neither PRIMARY nor FILTERED. And never we have a COW child here. | |
1433 | * So bs->file will be the PRIMARY child, unless the PRIMARY child goes | |
1434 | * into bs->backing on exceptional cases; and bs->backing will be | |
1435 | * nothing else. | |
1436 | */ | |
1437 | assert(!(child->role & BDRV_CHILD_COW)); | |
1438 | if (child->role & BDRV_CHILD_PRIMARY) { | |
1439 | assert(child->role & BDRV_CHILD_FILTERED); | |
1440 | assert(!bs->backing); | |
1441 | assert(!bs->file); | |
1442 | ||
1443 | if (bs->drv->filtered_child_is_backing) { | |
1444 | bs->backing = child; | |
1445 | } else { | |
1446 | bs->file = child; | |
1447 | } | |
1448 | } else { | |
1449 | assert(!(child->role & BDRV_CHILD_FILTERED)); | |
1450 | } | |
1451 | } else if (child->role & BDRV_CHILD_COW) { | |
1452 | assert(bs->drv->supports_backing); | |
1453 | assert(!(child->role & BDRV_CHILD_PRIMARY)); | |
1454 | assert(!bs->backing); | |
1455 | bs->backing = child; | |
ca2f1234 | 1456 | bdrv_backing_attach(child); |
5bb04747 VSO |
1457 | } else if (child->role & BDRV_CHILD_PRIMARY) { |
1458 | assert(!bs->file); | |
1459 | bs->file = child; | |
ca2f1234 | 1460 | } |
ca2f1234 HR |
1461 | } |
1462 | ||
303de47b | 1463 | static void GRAPH_WRLOCK bdrv_child_cb_detach(BdrvChild *child) |
48e08288 HR |
1464 | { |
1465 | BlockDriverState *bs = child->opaque; | |
1466 | ||
1467 | if (child->role & BDRV_CHILD_COW) { | |
1468 | bdrv_backing_detach(child); | |
1469 | } | |
1470 | ||
3f35f82e | 1471 | assert_bdrv_graph_writable(); |
a225369b | 1472 | QLIST_REMOVE(child, next); |
5bb04747 VSO |
1473 | if (child == bs->backing) { |
1474 | assert(child != bs->file); | |
1475 | bs->backing = NULL; | |
1476 | } else if (child == bs->file) { | |
1477 | bs->file = NULL; | |
1478 | } | |
48e08288 HR |
1479 | } |
1480 | ||
43483550 HR |
1481 | static int bdrv_child_cb_update_filename(BdrvChild *c, BlockDriverState *base, |
1482 | const char *filename, Error **errp) | |
1483 | { | |
1484 | if (c->role & BDRV_CHILD_COW) { | |
1485 | return bdrv_backing_update_filename(c, base, filename, errp); | |
1486 | } | |
1487 | return 0; | |
1488 | } | |
1489 | ||
fb62b588 | 1490 | AioContext *child_of_bds_get_parent_aio_context(BdrvChild *c) |
3ca1f322 VSO |
1491 | { |
1492 | BlockDriverState *bs = c->opaque; | |
384a48fb | 1493 | IO_CODE(); |
3ca1f322 VSO |
1494 | |
1495 | return bdrv_get_aio_context(bs); | |
1496 | } | |
1497 | ||
43483550 HR |
1498 | const BdrvChildClass child_of_bds = { |
1499 | .parent_is_bds = true, | |
1500 | .get_parent_desc = bdrv_child_get_parent_desc, | |
1501 | .inherit_options = bdrv_inherited_options, | |
1502 | .drained_begin = bdrv_child_cb_drained_begin, | |
1503 | .drained_poll = bdrv_child_cb_drained_poll, | |
1504 | .drained_end = bdrv_child_cb_drained_end, | |
1505 | .attach = bdrv_child_cb_attach, | |
1506 | .detach = bdrv_child_cb_detach, | |
1507 | .inactivate = bdrv_child_cb_inactivate, | |
27633e74 | 1508 | .change_aio_ctx = bdrv_child_cb_change_aio_ctx, |
43483550 | 1509 | .update_filename = bdrv_child_cb_update_filename, |
fb62b588 | 1510 | .get_parent_aio_context = child_of_bds_get_parent_aio_context, |
43483550 HR |
1511 | }; |
1512 | ||
3ca1f322 VSO |
1513 | AioContext *bdrv_child_get_parent_aio_context(BdrvChild *c) |
1514 | { | |
d5f8d79c | 1515 | IO_CODE(); |
3ca1f322 VSO |
1516 | return c->klass->get_parent_aio_context(c); |
1517 | } | |
1518 | ||
7b272452 KW |
1519 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
1520 | { | |
61de4c68 | 1521 | int open_flags = flags; |
bdb73476 | 1522 | GLOBAL_STATE_CODE(); |
7b272452 KW |
1523 | |
1524 | /* | |
1525 | * Clear flags that are internal to the block layer before opening the | |
1526 | * image. | |
1527 | */ | |
20cca275 | 1528 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
7b272452 | 1529 | |
7b272452 KW |
1530 | return open_flags; |
1531 | } | |
1532 | ||
91a097e7 KW |
1533 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
1534 | { | |
bdb73476 EGE |
1535 | GLOBAL_STATE_CODE(); |
1536 | ||
2a3d4331 | 1537 | *flags &= ~(BDRV_O_CACHE_MASK | BDRV_O_RDWR | BDRV_O_AUTO_RDONLY); |
91a097e7 | 1538 | |
57f9db9a | 1539 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { |
91a097e7 KW |
1540 | *flags |= BDRV_O_NO_FLUSH; |
1541 | } | |
1542 | ||
57f9db9a | 1543 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_DIRECT, false)) { |
91a097e7 KW |
1544 | *flags |= BDRV_O_NOCACHE; |
1545 | } | |
f87a0e29 | 1546 | |
57f9db9a | 1547 | if (!qemu_opt_get_bool_del(opts, BDRV_OPT_READ_ONLY, false)) { |
f87a0e29 AG |
1548 | *flags |= BDRV_O_RDWR; |
1549 | } | |
1550 | ||
e35bdc12 KW |
1551 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_AUTO_READ_ONLY, false)) { |
1552 | *flags |= BDRV_O_AUTO_RDONLY; | |
1553 | } | |
91a097e7 KW |
1554 | } |
1555 | ||
1556 | static void update_options_from_flags(QDict *options, int flags) | |
1557 | { | |
bdb73476 | 1558 | GLOBAL_STATE_CODE(); |
91a097e7 | 1559 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
46f5ac20 | 1560 | qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, flags & BDRV_O_NOCACHE); |
91a097e7 KW |
1561 | } |
1562 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { | |
46f5ac20 EB |
1563 | qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH, |
1564 | flags & BDRV_O_NO_FLUSH); | |
91a097e7 | 1565 | } |
f87a0e29 | 1566 | if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { |
46f5ac20 | 1567 | qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); |
f87a0e29 | 1568 | } |
e35bdc12 KW |
1569 | if (!qdict_haskey(options, BDRV_OPT_AUTO_READ_ONLY)) { |
1570 | qdict_put_bool(options, BDRV_OPT_AUTO_READ_ONLY, | |
1571 | flags & BDRV_O_AUTO_RDONLY); | |
1572 | } | |
91a097e7 KW |
1573 | } |
1574 | ||
636ea370 KW |
1575 | static void bdrv_assign_node_name(BlockDriverState *bs, |
1576 | const char *node_name, | |
1577 | Error **errp) | |
6913c0c2 | 1578 | { |
15489c76 | 1579 | char *gen_node_name = NULL; |
bdb73476 | 1580 | GLOBAL_STATE_CODE(); |
6913c0c2 | 1581 | |
15489c76 JC |
1582 | if (!node_name) { |
1583 | node_name = gen_node_name = id_generate(ID_BLOCK); | |
1584 | } else if (!id_wellformed(node_name)) { | |
1585 | /* | |
1586 | * Check for empty string or invalid characters, but not if it is | |
1587 | * generated (generated names use characters not available to the user) | |
1588 | */ | |
785ec4b1 | 1589 | error_setg(errp, "Invalid node-name: '%s'", node_name); |
636ea370 | 1590 | return; |
6913c0c2 BC |
1591 | } |
1592 | ||
0c5e94ee | 1593 | /* takes care of avoiding namespaces collisions */ |
7f06d47e | 1594 | if (blk_by_name(node_name)) { |
0c5e94ee BC |
1595 | error_setg(errp, "node-name=%s is conflicting with a device id", |
1596 | node_name); | |
15489c76 | 1597 | goto out; |
0c5e94ee BC |
1598 | } |
1599 | ||
6913c0c2 BC |
1600 | /* takes care of avoiding duplicates node names */ |
1601 | if (bdrv_find_node(node_name)) { | |
785ec4b1 | 1602 | error_setg(errp, "Duplicate nodes with node-name='%s'", node_name); |
15489c76 | 1603 | goto out; |
6913c0c2 BC |
1604 | } |
1605 | ||
824808dd KW |
1606 | /* Make sure that the node name isn't truncated */ |
1607 | if (strlen(node_name) >= sizeof(bs->node_name)) { | |
1608 | error_setg(errp, "Node name too long"); | |
1609 | goto out; | |
1610 | } | |
1611 | ||
6913c0c2 BC |
1612 | /* copy node name into the bs and insert it into the graph list */ |
1613 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
1614 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
15489c76 JC |
1615 | out: |
1616 | g_free(gen_node_name); | |
6913c0c2 BC |
1617 | } |
1618 | ||
1a30b0f5 KW |
1619 | static int no_coroutine_fn GRAPH_UNLOCKED |
1620 | bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name, | |
1621 | QDict *options, int open_flags, Error **errp) | |
01a56501 KW |
1622 | { |
1623 | Error *local_err = NULL; | |
0f12264e | 1624 | int i, ret; |
da359909 | 1625 | GLOBAL_STATE_CODE(); |
01a56501 KW |
1626 | |
1627 | bdrv_assign_node_name(bs, node_name, &local_err); | |
1628 | if (local_err) { | |
1629 | error_propagate(errp, local_err); | |
1630 | return -EINVAL; | |
1631 | } | |
1632 | ||
1633 | bs->drv = drv; | |
1634 | bs->opaque = g_malloc0(drv->instance_size); | |
1635 | ||
1636 | if (drv->bdrv_file_open) { | |
1637 | assert(!drv->bdrv_needs_filename || bs->filename[0]); | |
1638 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); | |
680c7f96 | 1639 | } else if (drv->bdrv_open) { |
01a56501 | 1640 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
680c7f96 KW |
1641 | } else { |
1642 | ret = 0; | |
01a56501 KW |
1643 | } |
1644 | ||
1645 | if (ret < 0) { | |
1646 | if (local_err) { | |
1647 | error_propagate(errp, local_err); | |
1648 | } else if (bs->filename[0]) { | |
1649 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
1650 | } else { | |
1651 | error_setg_errno(errp, -ret, "Could not open image"); | |
1652 | } | |
180ca19a | 1653 | goto open_failed; |
01a56501 KW |
1654 | } |
1655 | ||
e8b65355 SH |
1656 | assert(!(bs->supported_read_flags & ~BDRV_REQ_MASK)); |
1657 | assert(!(bs->supported_write_flags & ~BDRV_REQ_MASK)); | |
1658 | ||
1659 | /* | |
1660 | * Always allow the BDRV_REQ_REGISTERED_BUF optimization hint. This saves | |
1661 | * drivers that pass read/write requests through to a child the trouble of | |
1662 | * declaring support explicitly. | |
1663 | * | |
1664 | * Drivers must not propagate this flag accidentally when they initiate I/O | |
1665 | * to a bounce buffer. That case should be rare though. | |
1666 | */ | |
1667 | bs->supported_read_flags |= BDRV_REQ_REGISTERED_BUF; | |
1668 | bs->supported_write_flags |= BDRV_REQ_REGISTERED_BUF; | |
1669 | ||
c057960c | 1670 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
01a56501 KW |
1671 | if (ret < 0) { |
1672 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
180ca19a | 1673 | return ret; |
01a56501 KW |
1674 | } |
1675 | ||
e19b157f | 1676 | bdrv_graph_rdlock_main_loop(); |
1e4c797c | 1677 | bdrv_refresh_limits(bs, NULL, &local_err); |
e19b157f KW |
1678 | bdrv_graph_rdunlock_main_loop(); |
1679 | ||
01a56501 KW |
1680 | if (local_err) { |
1681 | error_propagate(errp, local_err); | |
180ca19a | 1682 | return -EINVAL; |
01a56501 KW |
1683 | } |
1684 | ||
1685 | assert(bdrv_opt_mem_align(bs) != 0); | |
1686 | assert(bdrv_min_mem_align(bs) != 0); | |
1687 | assert(is_power_of_2(bs->bl.request_alignment)); | |
1688 | ||
0f12264e | 1689 | for (i = 0; i < bs->quiesce_counter; i++) { |
5e8ac217 KW |
1690 | if (drv->bdrv_drain_begin) { |
1691 | drv->bdrv_drain_begin(bs); | |
0f12264e KW |
1692 | } |
1693 | } | |
1694 | ||
01a56501 | 1695 | return 0; |
180ca19a MP |
1696 | open_failed: |
1697 | bs->drv = NULL; | |
1f051dcb | 1698 | |
6bc30f19 | 1699 | bdrv_graph_wrlock(); |
180ca19a MP |
1700 | if (bs->file != NULL) { |
1701 | bdrv_unref_child(bs, bs->file); | |
5bb04747 | 1702 | assert(!bs->file); |
180ca19a | 1703 | } |
6bc30f19 | 1704 | bdrv_graph_wrunlock(); |
1f051dcb | 1705 | |
01a56501 KW |
1706 | g_free(bs->opaque); |
1707 | bs->opaque = NULL; | |
01a56501 KW |
1708 | return ret; |
1709 | } | |
1710 | ||
621d1737 VSO |
1711 | /* |
1712 | * Create and open a block node. | |
1713 | * | |
1714 | * @options is a QDict of options to pass to the block drivers, or NULL for an | |
1715 | * empty set of options. The reference to the QDict belongs to the block layer | |
1716 | * after the call (even on failure), so if the caller intends to reuse the | |
1717 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. | |
1718 | */ | |
1719 | BlockDriverState *bdrv_new_open_driver_opts(BlockDriver *drv, | |
1720 | const char *node_name, | |
1721 | QDict *options, int flags, | |
1722 | Error **errp) | |
680c7f96 KW |
1723 | { |
1724 | BlockDriverState *bs; | |
1725 | int ret; | |
1726 | ||
f791bf7f EGE |
1727 | GLOBAL_STATE_CODE(); |
1728 | ||
680c7f96 KW |
1729 | bs = bdrv_new(); |
1730 | bs->open_flags = flags; | |
621d1737 VSO |
1731 | bs->options = options ?: qdict_new(); |
1732 | bs->explicit_options = qdict_clone_shallow(bs->options); | |
680c7f96 KW |
1733 | bs->opaque = NULL; |
1734 | ||
1735 | update_options_from_flags(bs->options, flags); | |
1736 | ||
1737 | ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp); | |
1738 | if (ret < 0) { | |
cb3e7f08 | 1739 | qobject_unref(bs->explicit_options); |
180ca19a | 1740 | bs->explicit_options = NULL; |
cb3e7f08 | 1741 | qobject_unref(bs->options); |
180ca19a | 1742 | bs->options = NULL; |
680c7f96 KW |
1743 | bdrv_unref(bs); |
1744 | return NULL; | |
1745 | } | |
1746 | ||
1747 | return bs; | |
1748 | } | |
1749 | ||
621d1737 VSO |
1750 | /* Create and open a block node. */ |
1751 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, | |
1752 | int flags, Error **errp) | |
1753 | { | |
f791bf7f | 1754 | GLOBAL_STATE_CODE(); |
621d1737 VSO |
1755 | return bdrv_new_open_driver_opts(drv, node_name, NULL, flags, errp); |
1756 | } | |
1757 | ||
c5f3014b | 1758 | QemuOptsList bdrv_runtime_opts = { |
18edf289 KW |
1759 | .name = "bdrv_common", |
1760 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), | |
1761 | .desc = { | |
1762 | { | |
1763 | .name = "node-name", | |
1764 | .type = QEMU_OPT_STRING, | |
1765 | .help = "Node name of the block device node", | |
1766 | }, | |
62392ebb KW |
1767 | { |
1768 | .name = "driver", | |
1769 | .type = QEMU_OPT_STRING, | |
1770 | .help = "Block driver to use for the node", | |
1771 | }, | |
91a097e7 KW |
1772 | { |
1773 | .name = BDRV_OPT_CACHE_DIRECT, | |
1774 | .type = QEMU_OPT_BOOL, | |
1775 | .help = "Bypass software writeback cache on the host", | |
1776 | }, | |
1777 | { | |
1778 | .name = BDRV_OPT_CACHE_NO_FLUSH, | |
1779 | .type = QEMU_OPT_BOOL, | |
1780 | .help = "Ignore flush requests", | |
1781 | }, | |
f87a0e29 AG |
1782 | { |
1783 | .name = BDRV_OPT_READ_ONLY, | |
1784 | .type = QEMU_OPT_BOOL, | |
1785 | .help = "Node is opened in read-only mode", | |
1786 | }, | |
e35bdc12 KW |
1787 | { |
1788 | .name = BDRV_OPT_AUTO_READ_ONLY, | |
1789 | .type = QEMU_OPT_BOOL, | |
1790 | .help = "Node can become read-only if opening read-write fails", | |
1791 | }, | |
692e01a2 KW |
1792 | { |
1793 | .name = "detect-zeroes", | |
1794 | .type = QEMU_OPT_STRING, | |
1795 | .help = "try to optimize zero writes (off, on, unmap)", | |
1796 | }, | |
818584a4 | 1797 | { |
415bbca8 | 1798 | .name = BDRV_OPT_DISCARD, |
818584a4 KW |
1799 | .type = QEMU_OPT_STRING, |
1800 | .help = "discard operation (ignore/off, unmap/on)", | |
1801 | }, | |
5a9347c6 FZ |
1802 | { |
1803 | .name = BDRV_OPT_FORCE_SHARE, | |
1804 | .type = QEMU_OPT_BOOL, | |
1805 | .help = "always accept other writers (default: off)", | |
1806 | }, | |
18edf289 KW |
1807 | { /* end of list */ } |
1808 | }, | |
1809 | }; | |
1810 | ||
5a5e7f8c ML |
1811 | QemuOptsList bdrv_create_opts_simple = { |
1812 | .name = "simple-create-opts", | |
1813 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_create_opts_simple.head), | |
fd17146c HR |
1814 | .desc = { |
1815 | { | |
1816 | .name = BLOCK_OPT_SIZE, | |
1817 | .type = QEMU_OPT_SIZE, | |
1818 | .help = "Virtual disk size" | |
1819 | }, | |
1820 | { | |
1821 | .name = BLOCK_OPT_PREALLOC, | |
1822 | .type = QEMU_OPT_STRING, | |
1823 | .help = "Preallocation mode (allowed values: off)" | |
1824 | }, | |
1825 | { /* end of list */ } | |
1826 | } | |
1827 | }; | |
1828 | ||
57915332 KW |
1829 | /* |
1830 | * Common part for opening disk images and files | |
b6ad491a KW |
1831 | * |
1832 | * Removes all processed options from *options. | |
57915332 | 1833 | */ |
5696c6e3 | 1834 | static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, |
82dc8b41 | 1835 | QDict *options, Error **errp) |
57915332 KW |
1836 | { |
1837 | int ret, open_flags; | |
035fccdf | 1838 | const char *filename; |
62392ebb | 1839 | const char *driver_name = NULL; |
6913c0c2 | 1840 | const char *node_name = NULL; |
818584a4 | 1841 | const char *discard; |
18edf289 | 1842 | QemuOpts *opts; |
62392ebb | 1843 | BlockDriver *drv; |
34b5d2c6 | 1844 | Error *local_err = NULL; |
307261b2 | 1845 | bool ro; |
57915332 | 1846 | |
1f051dcb KW |
1847 | GLOBAL_STATE_CODE(); |
1848 | ||
1849 | bdrv_graph_rdlock_main_loop(); | |
6405875c | 1850 | assert(bs->file == NULL); |
707ff828 | 1851 | assert(options != NULL && bs->options != options); |
1f051dcb | 1852 | bdrv_graph_rdunlock_main_loop(); |
57915332 | 1853 | |
62392ebb | 1854 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
af175e85 | 1855 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
62392ebb KW |
1856 | ret = -EINVAL; |
1857 | goto fail_opts; | |
1858 | } | |
1859 | ||
9b7e8691 AG |
1860 | update_flags_from_options(&bs->open_flags, opts); |
1861 | ||
62392ebb KW |
1862 | driver_name = qemu_opt_get(opts, "driver"); |
1863 | drv = bdrv_find_format(driver_name); | |
1864 | assert(drv != NULL); | |
1865 | ||
5a9347c6 FZ |
1866 | bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); |
1867 | ||
1868 | if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { | |
1869 | error_setg(errp, | |
1870 | BDRV_OPT_FORCE_SHARE | |
1871 | "=on can only be used with read-only images"); | |
1872 | ret = -EINVAL; | |
1873 | goto fail_opts; | |
1874 | } | |
1875 | ||
45673671 | 1876 | if (file != NULL) { |
b7cfc7d5 | 1877 | bdrv_graph_rdlock_main_loop(); |
f30c66ba | 1878 | bdrv_refresh_filename(blk_bs(file)); |
b7cfc7d5 KW |
1879 | bdrv_graph_rdunlock_main_loop(); |
1880 | ||
5696c6e3 | 1881 | filename = blk_bs(file)->filename; |
45673671 | 1882 | } else { |
129c7d1c MA |
1883 | /* |
1884 | * Caution: while qdict_get_try_str() is fine, getting | |
1885 | * non-string types would require more care. When @options | |
1886 | * come from -blockdev or blockdev_add, its members are typed | |
1887 | * according to the QAPI schema, but when they come from | |
1888 | * -drive, they're all QString. | |
1889 | */ | |
45673671 KW |
1890 | filename = qdict_get_try_str(options, "filename"); |
1891 | } | |
1892 | ||
4a008240 | 1893 | if (drv->bdrv_needs_filename && (!filename || !filename[0])) { |
765003db KW |
1894 | error_setg(errp, "The '%s' block driver requires a file name", |
1895 | drv->format_name); | |
18edf289 KW |
1896 | ret = -EINVAL; |
1897 | goto fail_opts; | |
6913c0c2 | 1898 | } |
6913c0c2 | 1899 | |
82dc8b41 KW |
1900 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
1901 | drv->format_name); | |
62392ebb | 1902 | |
307261b2 VSO |
1903 | ro = bdrv_is_read_only(bs); |
1904 | ||
1905 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, ro)) { | |
1906 | if (!ro && bdrv_is_whitelisted(drv, true)) { | |
018f9dea | 1907 | bdrv_graph_rdlock_main_loop(); |
8be25de6 | 1908 | ret = bdrv_apply_auto_read_only(bs, NULL, NULL); |
018f9dea | 1909 | bdrv_graph_rdunlock_main_loop(); |
8be25de6 KW |
1910 | } else { |
1911 | ret = -ENOTSUP; | |
1912 | } | |
1913 | if (ret < 0) { | |
1914 | error_setg(errp, | |
307261b2 | 1915 | !ro && bdrv_is_whitelisted(drv, true) |
8be25de6 KW |
1916 | ? "Driver '%s' can only be used for read-only devices" |
1917 | : "Driver '%s' is not whitelisted", | |
1918 | drv->format_name); | |
1919 | goto fail_opts; | |
1920 | } | |
b64ec4e4 | 1921 | } |
57915332 | 1922 | |
d3faa13e | 1923 | /* bdrv_new() and bdrv_close() make it so */ |
d73415a3 | 1924 | assert(qatomic_read(&bs->copy_on_read) == 0); |
d3faa13e | 1925 | |
82dc8b41 | 1926 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
307261b2 | 1927 | if (!ro) { |
0ebd24e0 KW |
1928 | bdrv_enable_copy_on_read(bs); |
1929 | } else { | |
1930 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
18edf289 KW |
1931 | ret = -EINVAL; |
1932 | goto fail_opts; | |
0ebd24e0 | 1933 | } |
53fec9d3 SH |
1934 | } |
1935 | ||
415bbca8 | 1936 | discard = qemu_opt_get(opts, BDRV_OPT_DISCARD); |
818584a4 KW |
1937 | if (discard != NULL) { |
1938 | if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) { | |
1939 | error_setg(errp, "Invalid discard option"); | |
1940 | ret = -EINVAL; | |
1941 | goto fail_opts; | |
1942 | } | |
1943 | } | |
1944 | ||
543770bd AG |
1945 | bs->detect_zeroes = |
1946 | bdrv_parse_detect_zeroes(opts, bs->open_flags, &local_err); | |
1947 | if (local_err) { | |
1948 | error_propagate(errp, local_err); | |
1949 | ret = -EINVAL; | |
1950 | goto fail_opts; | |
692e01a2 KW |
1951 | } |
1952 | ||
c2ad1b0c KW |
1953 | if (filename != NULL) { |
1954 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
1955 | } else { | |
1956 | bs->filename[0] = '\0'; | |
1957 | } | |
91af7014 | 1958 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
57915332 | 1959 | |
66f82cee | 1960 | /* Open the image, either directly or using a protocol */ |
82dc8b41 | 1961 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
01a56501 | 1962 | node_name = qemu_opt_get(opts, "node-name"); |
57915332 | 1963 | |
01a56501 KW |
1964 | assert(!drv->bdrv_file_open || file == NULL); |
1965 | ret = bdrv_open_driver(bs, drv, node_name, options, open_flags, errp); | |
51762288 | 1966 | if (ret < 0) { |
01a56501 | 1967 | goto fail_opts; |
3baca891 KW |
1968 | } |
1969 | ||
18edf289 | 1970 | qemu_opts_del(opts); |
57915332 KW |
1971 | return 0; |
1972 | ||
18edf289 KW |
1973 | fail_opts: |
1974 | qemu_opts_del(opts); | |
57915332 KW |
1975 | return ret; |
1976 | } | |
1977 | ||
5e5c4f63 KW |
1978 | static QDict *parse_json_filename(const char *filename, Error **errp) |
1979 | { | |
1980 | QObject *options_obj; | |
1981 | QDict *options; | |
1982 | int ret; | |
bdb73476 | 1983 | GLOBAL_STATE_CODE(); |
5e5c4f63 KW |
1984 | |
1985 | ret = strstart(filename, "json:", &filename); | |
1986 | assert(ret); | |
1987 | ||
5577fff7 | 1988 | options_obj = qobject_from_json(filename, errp); |
5e5c4f63 | 1989 | if (!options_obj) { |
5577fff7 | 1990 | error_prepend(errp, "Could not parse the JSON options: "); |
5e5c4f63 KW |
1991 | return NULL; |
1992 | } | |
1993 | ||
7dc847eb | 1994 | options = qobject_to(QDict, options_obj); |
ca6b6e1e | 1995 | if (!options) { |
cb3e7f08 | 1996 | qobject_unref(options_obj); |
5e5c4f63 KW |
1997 | error_setg(errp, "Invalid JSON object given"); |
1998 | return NULL; | |
1999 | } | |
2000 | ||
5e5c4f63 KW |
2001 | qdict_flatten(options); |
2002 | ||
2003 | return options; | |
2004 | } | |
2005 | ||
de3b53f0 KW |
2006 | static void parse_json_protocol(QDict *options, const char **pfilename, |
2007 | Error **errp) | |
2008 | { | |
2009 | QDict *json_options; | |
2010 | Error *local_err = NULL; | |
bdb73476 | 2011 | GLOBAL_STATE_CODE(); |
de3b53f0 KW |
2012 | |
2013 | /* Parse json: pseudo-protocol */ | |
2014 | if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { | |
2015 | return; | |
2016 | } | |
2017 | ||
2018 | json_options = parse_json_filename(*pfilename, &local_err); | |
2019 | if (local_err) { | |
2020 | error_propagate(errp, local_err); | |
2021 | return; | |
2022 | } | |
2023 | ||
2024 | /* Options given in the filename have lower priority than options | |
2025 | * specified directly */ | |
2026 | qdict_join(options, json_options, false); | |
cb3e7f08 | 2027 | qobject_unref(json_options); |
de3b53f0 KW |
2028 | *pfilename = NULL; |
2029 | } | |
2030 | ||
b6ce07aa | 2031 | /* |
f54120ff KW |
2032 | * Fills in default options for opening images and converts the legacy |
2033 | * filename/flags pair to option QDict entries. | |
53a29513 HR |
2034 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
2035 | * block driver has been specified explicitly. | |
b6ce07aa | 2036 | */ |
de3b53f0 | 2037 | static int bdrv_fill_options(QDict **options, const char *filename, |
053e1578 | 2038 | int *flags, Error **errp) |
ea2384d3 | 2039 | { |
c2ad1b0c | 2040 | const char *drvname; |
53a29513 | 2041 | bool protocol = *flags & BDRV_O_PROTOCOL; |
e3fa4bfa | 2042 | bool parse_filename = false; |
053e1578 | 2043 | BlockDriver *drv = NULL; |
34b5d2c6 | 2044 | Error *local_err = NULL; |
83f64091 | 2045 | |
da359909 EGE |
2046 | GLOBAL_STATE_CODE(); |
2047 | ||
129c7d1c MA |
2048 | /* |
2049 | * Caution: while qdict_get_try_str() is fine, getting non-string | |
2050 | * types would require more care. When @options come from | |
2051 | * -blockdev or blockdev_add, its members are typed according to | |
2052 | * the QAPI schema, but when they come from -drive, they're all | |
2053 | * QString. | |
2054 | */ | |
53a29513 | 2055 | drvname = qdict_get_try_str(*options, "driver"); |
053e1578 HR |
2056 | if (drvname) { |
2057 | drv = bdrv_find_format(drvname); | |
2058 | if (!drv) { | |
2059 | error_setg(errp, "Unknown driver '%s'", drvname); | |
2060 | return -ENOENT; | |
2061 | } | |
2062 | /* If the user has explicitly specified the driver, this choice should | |
2063 | * override the BDRV_O_PROTOCOL flag */ | |
2064 | protocol = drv->bdrv_file_open; | |
53a29513 HR |
2065 | } |
2066 | ||
2067 | if (protocol) { | |
2068 | *flags |= BDRV_O_PROTOCOL; | |
2069 | } else { | |
2070 | *flags &= ~BDRV_O_PROTOCOL; | |
2071 | } | |
2072 | ||
91a097e7 KW |
2073 | /* Translate cache options from flags into options */ |
2074 | update_options_from_flags(*options, *flags); | |
2075 | ||
035fccdf | 2076 | /* Fetch the file name from the options QDict if necessary */ |
17b005f1 | 2077 | if (protocol && filename) { |
f54120ff | 2078 | if (!qdict_haskey(*options, "filename")) { |
46f5ac20 | 2079 | qdict_put_str(*options, "filename", filename); |
f54120ff KW |
2080 | parse_filename = true; |
2081 | } else { | |
2082 | error_setg(errp, "Can't specify 'file' and 'filename' options at " | |
2083 | "the same time"); | |
2084 | return -EINVAL; | |
2085 | } | |
035fccdf KW |
2086 | } |
2087 | ||
c2ad1b0c | 2088 | /* Find the right block driver */ |
129c7d1c | 2089 | /* See cautionary note on accessing @options above */ |
f54120ff | 2090 | filename = qdict_get_try_str(*options, "filename"); |
f54120ff | 2091 | |
053e1578 HR |
2092 | if (!drvname && protocol) { |
2093 | if (filename) { | |
2094 | drv = bdrv_find_protocol(filename, parse_filename, errp); | |
17b005f1 | 2095 | if (!drv) { |
053e1578 | 2096 | return -EINVAL; |
17b005f1 | 2097 | } |
053e1578 HR |
2098 | |
2099 | drvname = drv->format_name; | |
46f5ac20 | 2100 | qdict_put_str(*options, "driver", drvname); |
053e1578 HR |
2101 | } else { |
2102 | error_setg(errp, "Must specify either driver or file"); | |
2103 | return -EINVAL; | |
98289620 | 2104 | } |
c2ad1b0c KW |
2105 | } |
2106 | ||
17b005f1 | 2107 | assert(drv || !protocol); |
c2ad1b0c | 2108 | |
f54120ff | 2109 | /* Driver-specific filename parsing */ |
17b005f1 | 2110 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
5acd9d81 | 2111 | drv->bdrv_parse_filename(filename, *options, &local_err); |
84d18f06 | 2112 | if (local_err) { |
34b5d2c6 | 2113 | error_propagate(errp, local_err); |
f54120ff | 2114 | return -EINVAL; |
6963a30d | 2115 | } |
cd5d031e HR |
2116 | |
2117 | if (!drv->bdrv_needs_filename) { | |
2118 | qdict_del(*options, "filename"); | |
cd5d031e | 2119 | } |
6963a30d KW |
2120 | } |
2121 | ||
f54120ff KW |
2122 | return 0; |
2123 | } | |
2124 | ||
148eb13c KW |
2125 | typedef struct BlockReopenQueueEntry { |
2126 | bool prepared; | |
2127 | BDRVReopenState state; | |
859443b0 | 2128 | QTAILQ_ENTRY(BlockReopenQueueEntry) entry; |
148eb13c KW |
2129 | } BlockReopenQueueEntry; |
2130 | ||
2131 | /* | |
2132 | * Return the flags that @bs will have after the reopens in @q have | |
2133 | * successfully completed. If @q is NULL (or @bs is not contained in @q), | |
2134 | * return the current flags. | |
2135 | */ | |
2136 | static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs) | |
2137 | { | |
2138 | BlockReopenQueueEntry *entry; | |
2139 | ||
2140 | if (q != NULL) { | |
859443b0 | 2141 | QTAILQ_FOREACH(entry, q, entry) { |
148eb13c KW |
2142 | if (entry->state.bs == bs) { |
2143 | return entry->state.flags; | |
2144 | } | |
2145 | } | |
2146 | } | |
2147 | ||
2148 | return bs->open_flags; | |
2149 | } | |
2150 | ||
2151 | /* Returns whether the image file can be written to after the reopen queue @q | |
2152 | * has been successfully applied, or right now if @q is NULL. */ | |
cc022140 HR |
2153 | static bool bdrv_is_writable_after_reopen(BlockDriverState *bs, |
2154 | BlockReopenQueue *q) | |
148eb13c KW |
2155 | { |
2156 | int flags = bdrv_reopen_get_flags(q, bs); | |
2157 | ||
2158 | return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR; | |
2159 | } | |
2160 | ||
cc022140 HR |
2161 | /* |
2162 | * Return whether the BDS can be written to. This is not necessarily | |
2163 | * the same as !bdrv_is_read_only(bs), as inactivated images may not | |
2164 | * be written to but do not count as read-only images. | |
2165 | */ | |
2166 | bool bdrv_is_writable(BlockDriverState *bs) | |
2167 | { | |
384a48fb | 2168 | IO_CODE(); |
cc022140 HR |
2169 | return bdrv_is_writable_after_reopen(bs, NULL); |
2170 | } | |
2171 | ||
3bf416ba VSO |
2172 | static char *bdrv_child_user_desc(BdrvChild *c) |
2173 | { | |
f0c28327 | 2174 | GLOBAL_STATE_CODE(); |
da261b69 | 2175 | return c->klass->get_parent_desc(c); |
3bf416ba VSO |
2176 | } |
2177 | ||
30ebb9aa VSO |
2178 | /* |
2179 | * Check that @a allows everything that @b needs. @a and @b must reference same | |
2180 | * child node. | |
2181 | */ | |
3bf416ba VSO |
2182 | static bool bdrv_a_allow_b(BdrvChild *a, BdrvChild *b, Error **errp) |
2183 | { | |
30ebb9aa VSO |
2184 | const char *child_bs_name; |
2185 | g_autofree char *a_user = NULL; | |
2186 | g_autofree char *b_user = NULL; | |
2187 | g_autofree char *perms = NULL; | |
2188 | ||
2189 | assert(a->bs); | |
2190 | assert(a->bs == b->bs); | |
862fded9 | 2191 | GLOBAL_STATE_CODE(); |
3bf416ba VSO |
2192 | |
2193 | if ((b->perm & a->shared_perm) == b->perm) { | |
2194 | return true; | |
2195 | } | |
2196 | ||
30ebb9aa VSO |
2197 | child_bs_name = bdrv_get_node_name(b->bs); |
2198 | a_user = bdrv_child_user_desc(a); | |
2199 | b_user = bdrv_child_user_desc(b); | |
2200 | perms = bdrv_perm_names(b->perm & ~a->shared_perm); | |
2201 | ||
2202 | error_setg(errp, "Permission conflict on node '%s': permissions '%s' are " | |
2203 | "both required by %s (uses node '%s' as '%s' child) and " | |
2204 | "unshared by %s (uses node '%s' as '%s' child).", | |
2205 | child_bs_name, perms, | |
2206 | b_user, child_bs_name, b->name, | |
2207 | a_user, child_bs_name, a->name); | |
3bf416ba VSO |
2208 | |
2209 | return false; | |
2210 | } | |
2211 | ||
3804e3cf KW |
2212 | static bool GRAPH_RDLOCK |
2213 | bdrv_parent_perms_conflict(BlockDriverState *bs, Error **errp) | |
3bf416ba VSO |
2214 | { |
2215 | BdrvChild *a, *b; | |
862fded9 | 2216 | GLOBAL_STATE_CODE(); |
3bf416ba VSO |
2217 | |
2218 | /* | |
2219 | * During the loop we'll look at each pair twice. That's correct because | |
2220 | * bdrv_a_allow_b() is asymmetric and we should check each pair in both | |
2221 | * directions. | |
2222 | */ | |
2223 | QLIST_FOREACH(a, &bs->parents, next_parent) { | |
2224 | QLIST_FOREACH(b, &bs->parents, next_parent) { | |
9397c14f | 2225 | if (a == b) { |
3bf416ba VSO |
2226 | continue; |
2227 | } | |
2228 | ||
2229 | if (!bdrv_a_allow_b(a, b, errp)) { | |
2230 | return true; | |
2231 | } | |
2232 | } | |
2233 | } | |
2234 | ||
2235 | return false; | |
2236 | } | |
2237 | ||
c629b6d2 KW |
2238 | static void GRAPH_RDLOCK |
2239 | bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, | |
2240 | BdrvChild *c, BdrvChildRole role, | |
2241 | BlockReopenQueue *reopen_queue, | |
2242 | uint64_t parent_perm, uint64_t parent_shared, | |
2243 | uint64_t *nperm, uint64_t *nshared) | |
ffd1a5a2 | 2244 | { |
0b3ca76e | 2245 | assert(bs->drv && bs->drv->bdrv_child_perm); |
da359909 | 2246 | GLOBAL_STATE_CODE(); |
e5d8a406 | 2247 | bs->drv->bdrv_child_perm(bs, c, role, reopen_queue, |
0b3ca76e AG |
2248 | parent_perm, parent_shared, |
2249 | nperm, nshared); | |
e0995dc3 | 2250 | /* TODO Take force_share from reopen_queue */ |
ffd1a5a2 FZ |
2251 | if (child_bs && child_bs->force_share) { |
2252 | *nshared = BLK_PERM_ALL; | |
2253 | } | |
2254 | } | |
2255 | ||
bd57f8f7 VSO |
2256 | /* |
2257 | * Adds the whole subtree of @bs (including @bs itself) to the @list (except for | |
2258 | * nodes that are already in the @list, of course) so that final list is | |
2259 | * topologically sorted. Return the result (GSList @list object is updated, so | |
2260 | * don't use old reference after function call). | |
2261 | * | |
2262 | * On function start @list must be already topologically sorted and for any node | |
2263 | * in the @list the whole subtree of the node must be in the @list as well. The | |
2264 | * simplest way to satisfy this criteria: use only result of | |
2265 | * bdrv_topological_dfs() or NULL as @list parameter. | |
2266 | */ | |
3804e3cf KW |
2267 | static GSList * GRAPH_RDLOCK |
2268 | bdrv_topological_dfs(GSList *list, GHashTable *found, BlockDriverState *bs) | |
bd57f8f7 VSO |
2269 | { |
2270 | BdrvChild *child; | |
2271 | g_autoptr(GHashTable) local_found = NULL; | |
2272 | ||
bdb73476 EGE |
2273 | GLOBAL_STATE_CODE(); |
2274 | ||
bd57f8f7 VSO |
2275 | if (!found) { |
2276 | assert(!list); | |
2277 | found = local_found = g_hash_table_new(NULL, NULL); | |
2278 | } | |
2279 | ||
2280 | if (g_hash_table_contains(found, bs)) { | |
2281 | return list; | |
2282 | } | |
2283 | g_hash_table_add(found, bs); | |
2284 | ||
2285 | QLIST_FOREACH(child, &bs->children, next) { | |
2286 | list = bdrv_topological_dfs(list, found, child->bs); | |
2287 | } | |
2288 | ||
2289 | return g_slist_prepend(list, bs); | |
2290 | } | |
2291 | ||
ecb776bd VSO |
2292 | typedef struct BdrvChildSetPermState { |
2293 | BdrvChild *child; | |
2294 | uint64_t old_perm; | |
2295 | uint64_t old_shared_perm; | |
2296 | } BdrvChildSetPermState; | |
b0defa83 VSO |
2297 | |
2298 | static void bdrv_child_set_perm_abort(void *opaque) | |
2299 | { | |
ecb776bd VSO |
2300 | BdrvChildSetPermState *s = opaque; |
2301 | ||
862fded9 EGE |
2302 | GLOBAL_STATE_CODE(); |
2303 | ||
ecb776bd VSO |
2304 | s->child->perm = s->old_perm; |
2305 | s->child->shared_perm = s->old_shared_perm; | |
b0defa83 VSO |
2306 | } |
2307 | ||
2308 | static TransactionActionDrv bdrv_child_set_pem_drv = { | |
2309 | .abort = bdrv_child_set_perm_abort, | |
ecb776bd | 2310 | .clean = g_free, |
b0defa83 VSO |
2311 | }; |
2312 | ||
ecb776bd VSO |
2313 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, |
2314 | uint64_t shared, Transaction *tran) | |
b0defa83 | 2315 | { |
ecb776bd | 2316 | BdrvChildSetPermState *s = g_new(BdrvChildSetPermState, 1); |
862fded9 | 2317 | GLOBAL_STATE_CODE(); |
ecb776bd VSO |
2318 | |
2319 | *s = (BdrvChildSetPermState) { | |
2320 | .child = c, | |
2321 | .old_perm = c->perm, | |
2322 | .old_shared_perm = c->shared_perm, | |
2323 | }; | |
b0defa83 VSO |
2324 | |
2325 | c->perm = perm; | |
2326 | c->shared_perm = shared; | |
2327 | ||
ecb776bd | 2328 | tran_add(tran, &bdrv_child_set_pem_drv, s); |
b0defa83 VSO |
2329 | } |
2330 | ||
bce73bc2 | 2331 | static void GRAPH_RDLOCK bdrv_drv_set_perm_commit(void *opaque) |
2513ef59 VSO |
2332 | { |
2333 | BlockDriverState *bs = opaque; | |
2334 | uint64_t cumulative_perms, cumulative_shared_perms; | |
da359909 | 2335 | GLOBAL_STATE_CODE(); |
2513ef59 VSO |
2336 | |
2337 | if (bs->drv->bdrv_set_perm) { | |
2338 | bdrv_get_cumulative_perm(bs, &cumulative_perms, | |
2339 | &cumulative_shared_perms); | |
2340 | bs->drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); | |
2341 | } | |
2342 | } | |
2343 | ||
bce73bc2 | 2344 | static void GRAPH_RDLOCK bdrv_drv_set_perm_abort(void *opaque) |
2513ef59 VSO |
2345 | { |
2346 | BlockDriverState *bs = opaque; | |
da359909 | 2347 | GLOBAL_STATE_CODE(); |
2513ef59 VSO |
2348 | |
2349 | if (bs->drv->bdrv_abort_perm_update) { | |
2350 | bs->drv->bdrv_abort_perm_update(bs); | |
2351 | } | |
2352 | } | |
2353 | ||
2354 | TransactionActionDrv bdrv_drv_set_perm_drv = { | |
2355 | .abort = bdrv_drv_set_perm_abort, | |
2356 | .commit = bdrv_drv_set_perm_commit, | |
2357 | }; | |
2358 | ||
bce73bc2 KW |
2359 | /* |
2360 | * After calling this function, the transaction @tran may only be completed | |
2361 | * while holding a reader lock for the graph. | |
2362 | */ | |
2363 | static int GRAPH_RDLOCK | |
2364 | bdrv_drv_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared_perm, | |
2365 | Transaction *tran, Error **errp) | |
2513ef59 | 2366 | { |
da359909 | 2367 | GLOBAL_STATE_CODE(); |
2513ef59 VSO |
2368 | if (!bs->drv) { |
2369 | return 0; | |
2370 | } | |
2371 | ||
2372 | if (bs->drv->bdrv_check_perm) { | |
2373 | int ret = bs->drv->bdrv_check_perm(bs, perm, shared_perm, errp); | |
2374 | if (ret < 0) { | |
2375 | return ret; | |
2376 | } | |
2377 | } | |
2378 | ||
2379 | if (tran) { | |
2380 | tran_add(tran, &bdrv_drv_set_perm_drv, bs); | |
2381 | } | |
2382 | ||
2383 | return 0; | |
2384 | } | |
2385 | ||
0978623e VSO |
2386 | typedef struct BdrvReplaceChildState { |
2387 | BdrvChild *child; | |
2388 | BlockDriverState *old_bs; | |
2389 | } BdrvReplaceChildState; | |
2390 | ||
5661a00d | 2391 | static void GRAPH_WRLOCK bdrv_replace_child_commit(void *opaque) |
0978623e VSO |
2392 | { |
2393 | BdrvReplaceChildState *s = opaque; | |
bdb73476 | 2394 | GLOBAL_STATE_CODE(); |
0978623e | 2395 | |
5661a00d | 2396 | bdrv_schedule_unref(s->old_bs); |
0978623e VSO |
2397 | } |
2398 | ||
5661a00d | 2399 | static void GRAPH_WRLOCK bdrv_replace_child_abort(void *opaque) |
0978623e VSO |
2400 | { |
2401 | BdrvReplaceChildState *s = opaque; | |
2402 | BlockDriverState *new_bs = s->child->bs; | |
2403 | ||
bdb73476 | 2404 | GLOBAL_STATE_CODE(); |
5661a00d | 2405 | assert_bdrv_graph_writable(); |
ad29eb3d | 2406 | |
0f0b1e29 | 2407 | /* old_bs reference is transparently moved from @s to @s->child */ |
23987471 KW |
2408 | if (!s->child->bs) { |
2409 | /* | |
2410 | * The parents were undrained when removing old_bs from the child. New | |
2411 | * requests can't have been made, though, because the child was empty. | |
2412 | * | |
2413 | * TODO Make bdrv_replace_child_noperm() transactionable to avoid | |
2414 | * undraining the parent in the first place. Once this is done, having | |
2415 | * new_bs drained when calling bdrv_replace_child_tran() is not a | |
2416 | * requirement any more. | |
2417 | */ | |
606ed756 | 2418 | bdrv_parent_drained_begin_single(s->child); |
23987471 KW |
2419 | assert(!bdrv_parent_drained_poll_single(s->child)); |
2420 | } | |
2421 | assert(s->child->quiesced_parent); | |
544acc7d | 2422 | bdrv_replace_child_noperm(s->child, s->old_bs); |
ad29eb3d | 2423 | |
0978623e VSO |
2424 | bdrv_unref(new_bs); |
2425 | } | |
2426 | ||
2427 | static TransactionActionDrv bdrv_replace_child_drv = { | |
2428 | .commit = bdrv_replace_child_commit, | |
2429 | .abort = bdrv_replace_child_abort, | |
2430 | .clean = g_free, | |
2431 | }; | |
2432 | ||
2433 | /* | |
4bf021db | 2434 | * bdrv_replace_child_tran |
0978623e VSO |
2435 | * |
2436 | * Note: real unref of old_bs is done only on commit. | |
4bf021db | 2437 | * |
23987471 KW |
2438 | * Both @child->bs and @new_bs (if non-NULL) must be drained. @new_bs must be |
2439 | * kept drained until the transaction is completed. | |
2440 | * | |
5661a00d KW |
2441 | * After calling this function, the transaction @tran may only be completed |
2442 | * while holding a writer lock for the graph. | |
2443 | * | |
4bf021db | 2444 | * The function doesn't update permissions, caller is responsible for this. |
0978623e | 2445 | */ |
2f64e1fc KW |
2446 | static void GRAPH_WRLOCK |
2447 | bdrv_replace_child_tran(BdrvChild *child, BlockDriverState *new_bs, | |
2448 | Transaction *tran) | |
0978623e VSO |
2449 | { |
2450 | BdrvReplaceChildState *s = g_new(BdrvReplaceChildState, 1); | |
23987471 KW |
2451 | |
2452 | assert(child->quiesced_parent); | |
2453 | assert(!new_bs || new_bs->quiesce_counter); | |
2454 | ||
0978623e | 2455 | *s = (BdrvReplaceChildState) { |
0f0b1e29 VSO |
2456 | .child = child, |
2457 | .old_bs = child->bs, | |
0978623e VSO |
2458 | }; |
2459 | tran_add(tran, &bdrv_replace_child_drv, s); | |
2460 | ||
2461 | if (new_bs) { | |
2462 | bdrv_ref(new_bs); | |
2463 | } | |
ad29eb3d | 2464 | |
544acc7d | 2465 | bdrv_replace_child_noperm(child, new_bs); |
0f0b1e29 | 2466 | /* old_bs reference is transparently moved from @child to @s */ |
0978623e VSO |
2467 | } |
2468 | ||
33a610c3 | 2469 | /* |
c20555e1 VSO |
2470 | * Refresh permissions in @bs subtree. The function is intended to be called |
2471 | * after some graph modification that was done without permission update. | |
bce73bc2 KW |
2472 | * |
2473 | * After calling this function, the transaction @tran may only be completed | |
2474 | * while holding a reader lock for the graph. | |
33a610c3 | 2475 | */ |
bce73bc2 KW |
2476 | static int GRAPH_RDLOCK |
2477 | bdrv_node_refresh_perm(BlockDriverState *bs, BlockReopenQueue *q, | |
2478 | Transaction *tran, Error **errp) | |
33a610c3 KW |
2479 | { |
2480 | BlockDriver *drv = bs->drv; | |
2481 | BdrvChild *c; | |
2482 | int ret; | |
c20555e1 | 2483 | uint64_t cumulative_perms, cumulative_shared_perms; |
862fded9 | 2484 | GLOBAL_STATE_CODE(); |
c20555e1 VSO |
2485 | |
2486 | bdrv_get_cumulative_perm(bs, &cumulative_perms, &cumulative_shared_perms); | |
33a610c3 KW |
2487 | |
2488 | /* Write permissions never work with read-only images */ | |
2489 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && | |
cc022140 | 2490 | !bdrv_is_writable_after_reopen(bs, q)) |
33a610c3 | 2491 | { |
481e0eee HR |
2492 | if (!bdrv_is_writable_after_reopen(bs, NULL)) { |
2493 | error_setg(errp, "Block node is read-only"); | |
2494 | } else { | |
c20555e1 VSO |
2495 | error_setg(errp, "Read-only block node '%s' cannot support " |
2496 | "read-write users", bdrv_get_node_name(bs)); | |
481e0eee HR |
2497 | } |
2498 | ||
33a610c3 KW |
2499 | return -EPERM; |
2500 | } | |
2501 | ||
9c60a5d1 KW |
2502 | /* |
2503 | * Unaligned requests will automatically be aligned to bl.request_alignment | |
2504 | * and without RESIZE we can't extend requests to write to space beyond the | |
2505 | * end of the image, so it's required that the image size is aligned. | |
2506 | */ | |
2507 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && | |
2508 | !(cumulative_perms & BLK_PERM_RESIZE)) | |
2509 | { | |
2510 | if ((bs->total_sectors * BDRV_SECTOR_SIZE) % bs->bl.request_alignment) { | |
2511 | error_setg(errp, "Cannot get 'write' permission without 'resize': " | |
2512 | "Image size is not a multiple of request " | |
2513 | "alignment"); | |
2514 | return -EPERM; | |
2515 | } | |
2516 | } | |
2517 | ||
33a610c3 KW |
2518 | /* Check this node */ |
2519 | if (!drv) { | |
2520 | return 0; | |
2521 | } | |
2522 | ||
b1d2bbeb | 2523 | ret = bdrv_drv_set_perm(bs, cumulative_perms, cumulative_shared_perms, tran, |
2513ef59 VSO |
2524 | errp); |
2525 | if (ret < 0) { | |
2526 | return ret; | |
33a610c3 KW |
2527 | } |
2528 | ||
78e421c9 | 2529 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
33a610c3 | 2530 | if (!drv->bdrv_child_perm) { |
78e421c9 | 2531 | assert(QLIST_EMPTY(&bs->children)); |
33a610c3 KW |
2532 | return 0; |
2533 | } | |
2534 | ||
2535 | /* Check all children */ | |
2536 | QLIST_FOREACH(c, &bs->children, next) { | |
2537 | uint64_t cur_perm, cur_shared; | |
9eab1544 | 2538 | |
e5d8a406 | 2539 | bdrv_child_perm(bs, c->bs, c, c->role, q, |
ffd1a5a2 FZ |
2540 | cumulative_perms, cumulative_shared_perms, |
2541 | &cur_perm, &cur_shared); | |
ecb776bd | 2542 | bdrv_child_set_perm(c, cur_perm, cur_shared, tran); |
bd57f8f7 VSO |
2543 | } |
2544 | ||
2545 | return 0; | |
2546 | } | |
3ef45e02 | 2547 | |
fb0ff4d1 VSO |
2548 | /* |
2549 | * @list is a product of bdrv_topological_dfs() (may be called several times) - | |
2550 | * a topologically sorted subgraph. | |
bce73bc2 KW |
2551 | * |
2552 | * After calling this function, the transaction @tran may only be completed | |
2553 | * while holding a reader lock for the graph. | |
fb0ff4d1 | 2554 | */ |
3804e3cf KW |
2555 | static int GRAPH_RDLOCK |
2556 | bdrv_do_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, | |
2557 | Error **errp) | |
bd57f8f7 VSO |
2558 | { |
2559 | int ret; | |
b1d2bbeb | 2560 | BlockDriverState *bs; |
862fded9 | 2561 | GLOBAL_STATE_CODE(); |
bd57f8f7 | 2562 | |
b1d2bbeb VSO |
2563 | for ( ; list; list = list->next) { |
2564 | bs = list->data; | |
2565 | ||
9397c14f | 2566 | if (bdrv_parent_perms_conflict(bs, errp)) { |
b1d2bbeb | 2567 | return -EINVAL; |
bd57f8f7 VSO |
2568 | } |
2569 | ||
c20555e1 | 2570 | ret = bdrv_node_refresh_perm(bs, q, tran, errp); |
33a610c3 KW |
2571 | if (ret < 0) { |
2572 | return ret; | |
2573 | } | |
2574 | } | |
2575 | ||
2576 | return 0; | |
2577 | } | |
2578 | ||
fb0ff4d1 VSO |
2579 | /* |
2580 | * @list is any list of nodes. List is completed by all subtrees and | |
2581 | * topologically sorted. It's not a problem if some node occurs in the @list | |
2582 | * several times. | |
bce73bc2 KW |
2583 | * |
2584 | * After calling this function, the transaction @tran may only be completed | |
2585 | * while holding a reader lock for the graph. | |
fb0ff4d1 | 2586 | */ |
3804e3cf KW |
2587 | static int GRAPH_RDLOCK |
2588 | bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, | |
2589 | Error **errp) | |
fb0ff4d1 VSO |
2590 | { |
2591 | g_autoptr(GHashTable) found = g_hash_table_new(NULL, NULL); | |
2592 | g_autoptr(GSList) refresh_list = NULL; | |
2593 | ||
2594 | for ( ; list; list = list->next) { | |
2595 | refresh_list = bdrv_topological_dfs(refresh_list, found, list->data); | |
2596 | } | |
2597 | ||
2598 | return bdrv_do_refresh_perms(refresh_list, q, tran, errp); | |
2599 | } | |
2600 | ||
c7a0f2be KW |
2601 | void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm, |
2602 | uint64_t *shared_perm) | |
33a610c3 KW |
2603 | { |
2604 | BdrvChild *c; | |
2605 | uint64_t cumulative_perms = 0; | |
2606 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; | |
2607 | ||
b4ad82aa EGE |
2608 | GLOBAL_STATE_CODE(); |
2609 | ||
33a610c3 KW |
2610 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
2611 | cumulative_perms |= c->perm; | |
2612 | cumulative_shared_perms &= c->shared_perm; | |
2613 | } | |
2614 | ||
2615 | *perm = cumulative_perms; | |
2616 | *shared_perm = cumulative_shared_perms; | |
2617 | } | |
2618 | ||
5176196c | 2619 | char *bdrv_perm_names(uint64_t perm) |
d083319f KW |
2620 | { |
2621 | struct perm_name { | |
2622 | uint64_t perm; | |
2623 | const char *name; | |
2624 | } permissions[] = { | |
2625 | { BLK_PERM_CONSISTENT_READ, "consistent read" }, | |
2626 | { BLK_PERM_WRITE, "write" }, | |
2627 | { BLK_PERM_WRITE_UNCHANGED, "write unchanged" }, | |
2628 | { BLK_PERM_RESIZE, "resize" }, | |
d083319f KW |
2629 | { 0, NULL } |
2630 | }; | |
2631 | ||
e2a7423a | 2632 | GString *result = g_string_sized_new(30); |
d083319f KW |
2633 | struct perm_name *p; |
2634 | ||
2635 | for (p = permissions; p->name; p++) { | |
2636 | if (perm & p->perm) { | |
e2a7423a AG |
2637 | if (result->len > 0) { |
2638 | g_string_append(result, ", "); | |
2639 | } | |
2640 | g_string_append(result, p->name); | |
d083319f KW |
2641 | } |
2642 | } | |
2643 | ||
e2a7423a | 2644 | return g_string_free(result, FALSE); |
d083319f KW |
2645 | } |
2646 | ||
33a610c3 | 2647 | |
bce73bc2 KW |
2648 | /* |
2649 | * @tran is allowed to be NULL. In this case no rollback is possible. | |
2650 | * | |
2651 | * After calling this function, the transaction @tran may only be completed | |
2652 | * while holding a reader lock for the graph. | |
2653 | */ | |
3804e3cf KW |
2654 | static int GRAPH_RDLOCK |
2655 | bdrv_refresh_perms(BlockDriverState *bs, Transaction *tran, Error **errp) | |
bb87e4d1 VSO |
2656 | { |
2657 | int ret; | |
f1316edb | 2658 | Transaction *local_tran = NULL; |
b1d2bbeb | 2659 | g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs); |
862fded9 | 2660 | GLOBAL_STATE_CODE(); |
bb87e4d1 | 2661 | |
f1316edb VSO |
2662 | if (!tran) { |
2663 | tran = local_tran = tran_new(); | |
2664 | } | |
2665 | ||
fb0ff4d1 | 2666 | ret = bdrv_do_refresh_perms(list, NULL, tran, errp); |
f1316edb VSO |
2667 | |
2668 | if (local_tran) { | |
2669 | tran_finalize(local_tran, ret); | |
2670 | } | |
bb87e4d1 | 2671 | |
b1d2bbeb | 2672 | return ret; |
bb87e4d1 VSO |
2673 | } |
2674 | ||
33a610c3 KW |
2675 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
2676 | Error **errp) | |
2677 | { | |
1046779e | 2678 | Error *local_err = NULL; |
83928dc4 | 2679 | Transaction *tran = tran_new(); |
33a610c3 KW |
2680 | int ret; |
2681 | ||
b4ad82aa EGE |
2682 | GLOBAL_STATE_CODE(); |
2683 | ||
ecb776bd | 2684 | bdrv_child_set_perm(c, perm, shared, tran); |
83928dc4 | 2685 | |
f1316edb | 2686 | ret = bdrv_refresh_perms(c->bs, tran, &local_err); |
83928dc4 VSO |
2687 | |
2688 | tran_finalize(tran, ret); | |
2689 | ||
33a610c3 | 2690 | if (ret < 0) { |
071b474f VSO |
2691 | if ((perm & ~c->perm) || (c->shared_perm & ~shared)) { |
2692 | /* tighten permissions */ | |
1046779e HR |
2693 | error_propagate(errp, local_err); |
2694 | } else { | |
2695 | /* | |
2696 | * Our caller may intend to only loosen restrictions and | |
2697 | * does not expect this function to fail. Errors are not | |
2698 | * fatal in such a case, so we can just hide them from our | |
2699 | * caller. | |
2700 | */ | |
2701 | error_free(local_err); | |
2702 | ret = 0; | |
2703 | } | |
33a610c3 KW |
2704 | } |
2705 | ||
83928dc4 | 2706 | return ret; |
d5e6f437 KW |
2707 | } |
2708 | ||
c1087f12 HR |
2709 | int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp) |
2710 | { | |
2711 | uint64_t parent_perms, parent_shared; | |
2712 | uint64_t perms, shared; | |
2713 | ||
b4ad82aa EGE |
2714 | GLOBAL_STATE_CODE(); |
2715 | ||
c1087f12 | 2716 | bdrv_get_cumulative_perm(bs, &parent_perms, &parent_shared); |
e5d8a406 | 2717 | bdrv_child_perm(bs, c->bs, c, c->role, NULL, |
bf8e925e | 2718 | parent_perms, parent_shared, &perms, &shared); |
c1087f12 HR |
2719 | |
2720 | return bdrv_child_try_set_perm(c, perms, shared, errp); | |
2721 | } | |
2722 | ||
87278af1 HR |
2723 | /* |
2724 | * Default implementation for .bdrv_child_perm() for block filters: | |
2725 | * Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED, and RESIZE to the | |
2726 | * filtered child. | |
2727 | */ | |
2728 | static void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, | |
87278af1 HR |
2729 | BdrvChildRole role, |
2730 | BlockReopenQueue *reopen_queue, | |
2731 | uint64_t perm, uint64_t shared, | |
2732 | uint64_t *nperm, uint64_t *nshared) | |
6a1b9ee1 | 2733 | { |
862fded9 | 2734 | GLOBAL_STATE_CODE(); |
e444fa83 KW |
2735 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; |
2736 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; | |
6a1b9ee1 KW |
2737 | } |
2738 | ||
70082db4 | 2739 | static void bdrv_default_perms_for_cow(BlockDriverState *bs, BdrvChild *c, |
70082db4 HR |
2740 | BdrvChildRole role, |
2741 | BlockReopenQueue *reopen_queue, | |
2742 | uint64_t perm, uint64_t shared, | |
2743 | uint64_t *nperm, uint64_t *nshared) | |
2744 | { | |
e5d8a406 | 2745 | assert(role & BDRV_CHILD_COW); |
862fded9 | 2746 | GLOBAL_STATE_CODE(); |
70082db4 HR |
2747 | |
2748 | /* | |
2749 | * We want consistent read from backing files if the parent needs it. | |
2750 | * No other operations are performed on backing files. | |
2751 | */ | |
2752 | perm &= BLK_PERM_CONSISTENT_READ; | |
2753 | ||
2754 | /* | |
2755 | * If the parent can deal with changing data, we're okay with a | |
2756 | * writable and resizable backing file. | |
2757 | * TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? | |
2758 | */ | |
2759 | if (shared & BLK_PERM_WRITE) { | |
2760 | shared = BLK_PERM_WRITE | BLK_PERM_RESIZE; | |
2761 | } else { | |
2762 | shared = 0; | |
2763 | } | |
2764 | ||
64631f36 | 2765 | shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; |
70082db4 HR |
2766 | |
2767 | if (bs->open_flags & BDRV_O_INACTIVE) { | |
2768 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; | |
2769 | } | |
2770 | ||
2771 | *nperm = perm; | |
2772 | *nshared = shared; | |
2773 | } | |
2774 | ||
6f838a4b | 2775 | static void bdrv_default_perms_for_storage(BlockDriverState *bs, BdrvChild *c, |
6f838a4b HR |
2776 | BdrvChildRole role, |
2777 | BlockReopenQueue *reopen_queue, | |
2778 | uint64_t perm, uint64_t shared, | |
2779 | uint64_t *nperm, uint64_t *nshared) | |
2780 | { | |
2781 | int flags; | |
2782 | ||
862fded9 | 2783 | GLOBAL_STATE_CODE(); |
e5d8a406 | 2784 | assert(role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)); |
6f838a4b HR |
2785 | |
2786 | flags = bdrv_reopen_get_flags(reopen_queue, bs); | |
2787 | ||
2788 | /* | |
2789 | * Apart from the modifications below, the same permissions are | |
2790 | * forwarded and left alone as for filters | |
2791 | */ | |
e5d8a406 | 2792 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
6f838a4b HR |
2793 | perm, shared, &perm, &shared); |
2794 | ||
f889054f HR |
2795 | if (role & BDRV_CHILD_METADATA) { |
2796 | /* Format drivers may touch metadata even if the guest doesn't write */ | |
2797 | if (bdrv_is_writable_after_reopen(bs, reopen_queue)) { | |
2798 | perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; | |
2799 | } | |
2800 | ||
2801 | /* | |
2802 | * bs->file always needs to be consistent because of the | |
2803 | * metadata. We can never allow other users to resize or write | |
2804 | * to it. | |
2805 | */ | |
2806 | if (!(flags & BDRV_O_NO_IO)) { | |
2807 | perm |= BLK_PERM_CONSISTENT_READ; | |
2808 | } | |
2809 | shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
6f838a4b HR |
2810 | } |
2811 | ||
f889054f HR |
2812 | if (role & BDRV_CHILD_DATA) { |
2813 | /* | |
2814 | * Technically, everything in this block is a subset of the | |
2815 | * BDRV_CHILD_METADATA path taken above, and so this could | |
2816 | * be an "else if" branch. However, that is not obvious, and | |
2817 | * this function is not performance critical, therefore we let | |
2818 | * this be an independent "if". | |
2819 | */ | |
2820 | ||
2821 | /* | |
2822 | * We cannot allow other users to resize the file because the | |
2823 | * format driver might have some assumptions about the size | |
2824 | * (e.g. because it is stored in metadata, or because the file | |
2825 | * is split into fixed-size data files). | |
2826 | */ | |
2827 | shared &= ~BLK_PERM_RESIZE; | |
2828 | ||
2829 | /* | |
2830 | * WRITE_UNCHANGED often cannot be performed as such on the | |
2831 | * data file. For example, the qcow2 driver may still need to | |
2832 | * write copied clusters on copy-on-read. | |
2833 | */ | |
2834 | if (perm & BLK_PERM_WRITE_UNCHANGED) { | |
2835 | perm |= BLK_PERM_WRITE; | |
2836 | } | |
2837 | ||
2838 | /* | |
2839 | * If the data file is written to, the format driver may | |
2840 | * expect to be able to resize it by writing beyond the EOF. | |
2841 | */ | |
2842 | if (perm & BLK_PERM_WRITE) { | |
2843 | perm |= BLK_PERM_RESIZE; | |
2844 | } | |
6f838a4b | 2845 | } |
6f838a4b HR |
2846 | |
2847 | if (bs->open_flags & BDRV_O_INACTIVE) { | |
2848 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; | |
2849 | } | |
2850 | ||
2851 | *nperm = perm; | |
2852 | *nshared = shared; | |
2853 | } | |
2854 | ||
2519f549 | 2855 | void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c, |
e5d8a406 | 2856 | BdrvChildRole role, BlockReopenQueue *reopen_queue, |
2519f549 HR |
2857 | uint64_t perm, uint64_t shared, |
2858 | uint64_t *nperm, uint64_t *nshared) | |
2859 | { | |
b4ad82aa | 2860 | GLOBAL_STATE_CODE(); |
2519f549 HR |
2861 | if (role & BDRV_CHILD_FILTERED) { |
2862 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | | |
2863 | BDRV_CHILD_COW))); | |
e5d8a406 | 2864 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
2519f549 HR |
2865 | perm, shared, nperm, nshared); |
2866 | } else if (role & BDRV_CHILD_COW) { | |
2867 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA))); | |
e5d8a406 | 2868 | bdrv_default_perms_for_cow(bs, c, role, reopen_queue, |
2519f549 HR |
2869 | perm, shared, nperm, nshared); |
2870 | } else if (role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)) { | |
e5d8a406 | 2871 | bdrv_default_perms_for_storage(bs, c, role, reopen_queue, |
2519f549 HR |
2872 | perm, shared, nperm, nshared); |
2873 | } else { | |
2874 | g_assert_not_reached(); | |
2875 | } | |
2876 | } | |
2877 | ||
7b1d9c4d HR |
2878 | uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm) |
2879 | { | |
2880 | static const uint64_t permissions[] = { | |
2881 | [BLOCK_PERMISSION_CONSISTENT_READ] = BLK_PERM_CONSISTENT_READ, | |
2882 | [BLOCK_PERMISSION_WRITE] = BLK_PERM_WRITE, | |
2883 | [BLOCK_PERMISSION_WRITE_UNCHANGED] = BLK_PERM_WRITE_UNCHANGED, | |
2884 | [BLOCK_PERMISSION_RESIZE] = BLK_PERM_RESIZE, | |
7b1d9c4d HR |
2885 | }; |
2886 | ||
2887 | QEMU_BUILD_BUG_ON(ARRAY_SIZE(permissions) != BLOCK_PERMISSION__MAX); | |
2888 | QEMU_BUILD_BUG_ON(1UL << ARRAY_SIZE(permissions) != BLK_PERM_ALL + 1); | |
2889 | ||
2890 | assert(qapi_perm < BLOCK_PERMISSION__MAX); | |
2891 | ||
2892 | return permissions[qapi_perm]; | |
2893 | } | |
2894 | ||
23987471 KW |
2895 | /* |
2896 | * Replaces the node that a BdrvChild points to without updating permissions. | |
2897 | * | |
2898 | * If @new_bs is non-NULL, the parent of @child must already be drained through | |
23c983c8 | 2899 | * @child. |
23987471 | 2900 | */ |
ad29eb3d KW |
2901 | static void GRAPH_WRLOCK |
2902 | bdrv_replace_child_noperm(BdrvChild *child, BlockDriverState *new_bs) | |
e9740bc6 KW |
2903 | { |
2904 | BlockDriverState *old_bs = child->bs; | |
debc2927 | 2905 | int new_bs_quiesce_counter; |
e9740bc6 | 2906 | |
2cad1ebe | 2907 | assert(!child->frozen); |
23987471 KW |
2908 | |
2909 | /* | |
2910 | * If we want to change the BdrvChild to point to a drained node as its new | |
2911 | * child->bs, we need to make sure that its new parent is drained, too. In | |
2912 | * other words, either child->quiesce_parent must already be true or we must | |
2913 | * be able to set it and keep the parent's quiesce_counter consistent with | |
2914 | * that, but without polling or starting new requests (this function | |
2915 | * guarantees that it doesn't poll, and starting new requests would be | |
2916 | * against the invariants of drain sections). | |
2917 | * | |
2918 | * To keep things simple, we pick the first option (child->quiesce_parent | |
2919 | * must already be true). We also generalise the rule a bit to make it | |
2920 | * easier to verify in callers and more likely to be covered in test cases: | |
2921 | * The parent must be quiesced through this child even if new_bs isn't | |
2922 | * currently drained. | |
2923 | * | |
2924 | * The only exception is for callers that always pass new_bs == NULL. In | |
2925 | * this case, we obviously never need to consider the case of a drained | |
2926 | * new_bs, so we can keep the callers simpler by allowing them not to drain | |
2927 | * the parent. | |
2928 | */ | |
2929 | assert(!new_bs || child->quiesced_parent); | |
bfb8aa6d | 2930 | assert(old_bs != new_bs); |
f0c28327 | 2931 | GLOBAL_STATE_CODE(); |
2cad1ebe | 2932 | |
bb2614e9 FZ |
2933 | if (old_bs && new_bs) { |
2934 | assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); | |
2935 | } | |
debc2927 | 2936 | |
e9740bc6 | 2937 | if (old_bs) { |
bd86fb99 HR |
2938 | if (child->klass->detach) { |
2939 | child->klass->detach(child); | |
d736f119 | 2940 | } |
e9740bc6 KW |
2941 | QLIST_REMOVE(child, next_parent); |
2942 | } | |
36fe1331 KW |
2943 | |
2944 | child->bs = new_bs; | |
2945 | ||
e9740bc6 KW |
2946 | if (new_bs) { |
2947 | QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); | |
bd86fb99 HR |
2948 | if (child->klass->attach) { |
2949 | child->klass->attach(child); | |
8ee03995 KW |
2950 | } |
2951 | } | |
debc2927 HR |
2952 | |
2953 | /* | |
23987471 KW |
2954 | * If the parent was drained through this BdrvChild previously, but new_bs |
2955 | * is not drained, allow requests to come in only after the new node has | |
2956 | * been attached. | |
debc2927 | 2957 | */ |
57e05be3 KW |
2958 | new_bs_quiesce_counter = (new_bs ? new_bs->quiesce_counter : 0); |
2959 | if (!new_bs_quiesce_counter && child->quiesced_parent) { | |
debc2927 | 2960 | bdrv_parent_drained_end_single(child); |
debc2927 | 2961 | } |
8ee03995 | 2962 | } |
33a610c3 | 2963 | |
04c9c3a5 HR |
2964 | /** |
2965 | * Free the given @child. | |
2966 | * | |
2967 | * The child must be empty (i.e. `child->bs == NULL`) and it must be | |
2968 | * unused (i.e. not in a children list). | |
2969 | */ | |
2970 | static void bdrv_child_free(BdrvChild *child) | |
df581792 | 2971 | { |
548a74c0 | 2972 | assert(!child->bs); |
bdb73476 | 2973 | GLOBAL_STATE_CODE(); |
680e0cc4 KW |
2974 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
2975 | ||
a225369b | 2976 | assert(!child->next.le_prev); /* not in children list */ |
04c9c3a5 HR |
2977 | |
2978 | g_free(child->name); | |
2979 | g_free(child); | |
548a74c0 | 2980 | } |
d5e6f437 | 2981 | |
548a74c0 | 2982 | typedef struct BdrvAttachChildCommonState { |
5bb04747 | 2983 | BdrvChild *child; |
548a74c0 VSO |
2984 | AioContext *old_parent_ctx; |
2985 | AioContext *old_child_ctx; | |
2986 | } BdrvAttachChildCommonState; | |
2987 | ||
5661a00d | 2988 | static void GRAPH_WRLOCK bdrv_attach_child_common_abort(void *opaque) |
548a74c0 VSO |
2989 | { |
2990 | BdrvAttachChildCommonState *s = opaque; | |
5bb04747 | 2991 | BlockDriverState *bs = s->child->bs; |
548a74c0 | 2992 | |
f0c28327 | 2993 | GLOBAL_STATE_CODE(); |
5661a00d | 2994 | assert_bdrv_graph_writable(); |
ad29eb3d | 2995 | |
5bb04747 | 2996 | bdrv_replace_child_noperm(s->child, NULL); |
548a74c0 VSO |
2997 | |
2998 | if (bdrv_get_aio_context(bs) != s->old_child_ctx) { | |
142e6907 | 2999 | bdrv_try_change_aio_context(bs, s->old_child_ctx, NULL, &error_abort); |
548a74c0 VSO |
3000 | } |
3001 | ||
5bb04747 | 3002 | if (bdrv_child_get_parent_aio_context(s->child) != s->old_parent_ctx) { |
f8be48ad EGE |
3003 | Transaction *tran; |
3004 | GHashTable *visited; | |
3005 | bool ret; | |
548a74c0 | 3006 | |
f8be48ad | 3007 | tran = tran_new(); |
548a74c0 | 3008 | |
f8be48ad EGE |
3009 | /* No need to visit `child`, because it has been detached already */ |
3010 | visited = g_hash_table_new(NULL, NULL); | |
3011 | ret = s->child->klass->change_aio_ctx(s->child, s->old_parent_ctx, | |
3012 | visited, tran, &error_abort); | |
3013 | g_hash_table_destroy(visited); | |
3014 | ||
3015 | /* transaction is supposed to always succeed */ | |
3016 | assert(ret == true); | |
3017 | tran_commit(tran); | |
d5e6f437 KW |
3018 | } |
3019 | ||
5661a00d | 3020 | bdrv_schedule_unref(bs); |
5bb04747 | 3021 | bdrv_child_free(s->child); |
548a74c0 VSO |
3022 | } |
3023 | ||
3024 | static TransactionActionDrv bdrv_attach_child_common_drv = { | |
3025 | .abort = bdrv_attach_child_common_abort, | |
3026 | .clean = g_free, | |
3027 | }; | |
3028 | ||
3029 | /* | |
3030 | * Common part of attaching bdrv child to bs or to blk or to job | |
f8d2ad78 | 3031 | * |
7ec390d5 | 3032 | * Function doesn't update permissions, caller is responsible for this. |
5bb04747 | 3033 | * |
5661a00d KW |
3034 | * After calling this function, the transaction @tran may only be completed |
3035 | * while holding a writer lock for the graph. | |
3036 | * | |
5bb04747 | 3037 | * Returns new created child. |
c066e808 | 3038 | * |
23c983c8 SH |
3039 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
3040 | * function. | |
548a74c0 | 3041 | */ |
7d4ca9d2 KW |
3042 | static BdrvChild * GRAPH_WRLOCK |
3043 | bdrv_attach_child_common(BlockDriverState *child_bs, | |
3044 | const char *child_name, | |
3045 | const BdrvChildClass *child_class, | |
3046 | BdrvChildRole child_role, | |
3047 | uint64_t perm, uint64_t shared_perm, | |
3048 | void *opaque, | |
3049 | Transaction *tran, Error **errp) | |
548a74c0 VSO |
3050 | { |
3051 | BdrvChild *new_child; | |
b49f4755 | 3052 | AioContext *parent_ctx; |
548a74c0 VSO |
3053 | AioContext *child_ctx = bdrv_get_aio_context(child_bs); |
3054 | ||
da261b69 | 3055 | assert(child_class->get_parent_desc); |
bdb73476 | 3056 | GLOBAL_STATE_CODE(); |
548a74c0 VSO |
3057 | |
3058 | new_child = g_new(BdrvChild, 1); | |
3059 | *new_child = (BdrvChild) { | |
d5e6f437 KW |
3060 | .bs = NULL, |
3061 | .name = g_strdup(child_name), | |
bd86fb99 | 3062 | .klass = child_class, |
258b7765 | 3063 | .role = child_role, |
d5e6f437 KW |
3064 | .perm = perm, |
3065 | .shared_perm = shared_perm, | |
3066 | .opaque = opaque, | |
df581792 KW |
3067 | }; |
3068 | ||
548a74c0 VSO |
3069 | /* |
3070 | * If the AioContexts don't match, first try to move the subtree of | |
132ada80 | 3071 | * child_bs into the AioContext of the new parent. If this doesn't work, |
548a74c0 VSO |
3072 | * try moving the parent into the AioContext of child_bs instead. |
3073 | */ | |
3074 | parent_ctx = bdrv_child_get_parent_aio_context(new_child); | |
3075 | if (child_ctx != parent_ctx) { | |
3076 | Error *local_err = NULL; | |
142e6907 EGE |
3077 | int ret = bdrv_try_change_aio_context(child_bs, parent_ctx, NULL, |
3078 | &local_err); | |
548a74c0 | 3079 | |
f8be48ad | 3080 | if (ret < 0 && child_class->change_aio_ctx) { |
fb2575f9 | 3081 | Transaction *aio_ctx_tran = tran_new(); |
f8be48ad EGE |
3082 | GHashTable *visited = g_hash_table_new(NULL, NULL); |
3083 | bool ret_child; | |
3084 | ||
3085 | g_hash_table_add(visited, new_child); | |
3086 | ret_child = child_class->change_aio_ctx(new_child, child_ctx, | |
fb2575f9 MA |
3087 | visited, aio_ctx_tran, |
3088 | NULL); | |
f8be48ad | 3089 | if (ret_child == true) { |
132ada80 KW |
3090 | error_free(local_err); |
3091 | ret = 0; | |
132ada80 | 3092 | } |
fb2575f9 | 3093 | tran_finalize(aio_ctx_tran, ret_child == true ? 0 : -1); |
f8be48ad | 3094 | g_hash_table_destroy(visited); |
132ada80 | 3095 | } |
548a74c0 | 3096 | |
132ada80 KW |
3097 | if (ret < 0) { |
3098 | error_propagate(errp, local_err); | |
04c9c3a5 | 3099 | bdrv_child_free(new_child); |
5bb04747 | 3100 | return NULL; |
132ada80 KW |
3101 | } |
3102 | } | |
3103 | ||
548a74c0 | 3104 | bdrv_ref(child_bs); |
23987471 KW |
3105 | /* |
3106 | * Let every new BdrvChild start with a drained parent. Inserting the child | |
3107 | * in the graph with bdrv_replace_child_noperm() will undrain it if | |
3108 | * @child_bs is not drained. | |
3109 | * | |
3110 | * The child was only just created and is not yet visible in global state | |
3111 | * until bdrv_replace_child_noperm() inserts it into the graph, so nobody | |
3112 | * could have sent requests and polling is not necessary. | |
3113 | * | |
3114 | * Note that this means that the parent isn't fully drained yet, we only | |
3115 | * stop new requests from coming in. This is fine, we don't care about the | |
3116 | * old requests here, they are not for this child. If another place enters a | |
3117 | * drain section for the same parent, but wants it to be fully quiesced, it | |
3118 | * will not run most of the the code in .drained_begin() again (which is not | |
3119 | * a problem, we already did this), but it will still poll until the parent | |
3120 | * is fully quiesced, so it will not be negatively affected either. | |
3121 | */ | |
606ed756 | 3122 | bdrv_parent_drained_begin_single(new_child); |
544acc7d | 3123 | bdrv_replace_child_noperm(new_child, child_bs); |
b4b059f6 | 3124 | |
548a74c0 VSO |
3125 | BdrvAttachChildCommonState *s = g_new(BdrvAttachChildCommonState, 1); |
3126 | *s = (BdrvAttachChildCommonState) { | |
5bb04747 | 3127 | .child = new_child, |
548a74c0 VSO |
3128 | .old_parent_ctx = parent_ctx, |
3129 | .old_child_ctx = child_ctx, | |
3130 | }; | |
3131 | tran_add(tran, &bdrv_attach_child_common_drv, s); | |
3132 | ||
5bb04747 | 3133 | return new_child; |
548a74c0 VSO |
3134 | } |
3135 | ||
f8d2ad78 | 3136 | /* |
7ec390d5 | 3137 | * Function doesn't update permissions, caller is responsible for this. |
c066e808 | 3138 | * |
23c983c8 SH |
3139 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
3140 | * function. | |
5661a00d KW |
3141 | * |
3142 | * After calling this function, the transaction @tran may only be completed | |
3143 | * while holding a writer lock for the graph. | |
f8d2ad78 | 3144 | */ |
7d4ca9d2 KW |
3145 | static BdrvChild * GRAPH_WRLOCK |
3146 | bdrv_attach_child_noperm(BlockDriverState *parent_bs, | |
3147 | BlockDriverState *child_bs, | |
3148 | const char *child_name, | |
3149 | const BdrvChildClass *child_class, | |
3150 | BdrvChildRole child_role, | |
3151 | Transaction *tran, | |
3152 | Error **errp) | |
aa5a04c7 | 3153 | { |
aa5a04c7 VSO |
3154 | uint64_t perm, shared_perm; |
3155 | ||
3156 | assert(parent_bs->drv); | |
bdb73476 | 3157 | GLOBAL_STATE_CODE(); |
aa5a04c7 | 3158 | |
bfb8aa6d KW |
3159 | if (bdrv_recurse_has_child(child_bs, parent_bs)) { |
3160 | error_setg(errp, "Making '%s' a %s child of '%s' would create a cycle", | |
3161 | child_bs->node_name, child_name, parent_bs->node_name); | |
5bb04747 | 3162 | return NULL; |
bfb8aa6d KW |
3163 | } |
3164 | ||
aa5a04c7 VSO |
3165 | bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); |
3166 | bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL, | |
3167 | perm, shared_perm, &perm, &shared_perm); | |
3168 | ||
5bb04747 VSO |
3169 | return bdrv_attach_child_common(child_bs, child_name, child_class, |
3170 | child_role, perm, shared_perm, parent_bs, | |
3171 | tran, errp); | |
aa5a04c7 VSO |
3172 | } |
3173 | ||
548a74c0 VSO |
3174 | /* |
3175 | * This function steals the reference to child_bs from the caller. | |
3176 | * That reference is later dropped by bdrv_root_unref_child(). | |
3177 | * | |
3178 | * On failure NULL is returned, errp is set and the reference to | |
3179 | * child_bs is also dropped. | |
548a74c0 VSO |
3180 | */ |
3181 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, | |
3182 | const char *child_name, | |
3183 | const BdrvChildClass *child_class, | |
3184 | BdrvChildRole child_role, | |
3185 | uint64_t perm, uint64_t shared_perm, | |
3186 | void *opaque, Error **errp) | |
3187 | { | |
3188 | int ret; | |
5bb04747 | 3189 | BdrvChild *child; |
548a74c0 VSO |
3190 | Transaction *tran = tran_new(); |
3191 | ||
b4ad82aa EGE |
3192 | GLOBAL_STATE_CODE(); |
3193 | ||
5bb04747 | 3194 | child = bdrv_attach_child_common(child_bs, child_name, child_class, |
548a74c0 | 3195 | child_role, perm, shared_perm, opaque, |
5bb04747 VSO |
3196 | tran, errp); |
3197 | if (!child) { | |
3198 | ret = -EINVAL; | |
e878bb12 | 3199 | goto out; |
548a74c0 VSO |
3200 | } |
3201 | ||
f1316edb | 3202 | ret = bdrv_refresh_perms(child_bs, tran, errp); |
548a74c0 | 3203 | |
e878bb12 KW |
3204 | out: |
3205 | tran_finalize(tran, ret); | |
f8d2ad78 | 3206 | |
03b9eaca | 3207 | bdrv_schedule_unref(child_bs); |
5bb04747 VSO |
3208 | |
3209 | return ret < 0 ? NULL : child; | |
df581792 KW |
3210 | } |
3211 | ||
b441dc71 AG |
3212 | /* |
3213 | * This function transfers the reference to child_bs from the caller | |
3214 | * to parent_bs. That reference is later dropped by parent_bs on | |
3215 | * bdrv_close() or if someone calls bdrv_unref_child(). | |
3216 | * | |
3217 | * On failure NULL is returned, errp is set and the reference to | |
3218 | * child_bs is also dropped. | |
3219 | */ | |
98292c61 WC |
3220 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
3221 | BlockDriverState *child_bs, | |
3222 | const char *child_name, | |
bd86fb99 | 3223 | const BdrvChildClass *child_class, |
258b7765 | 3224 | BdrvChildRole child_role, |
8b2ff529 | 3225 | Error **errp) |
f21d96d0 | 3226 | { |
aa5a04c7 | 3227 | int ret; |
5bb04747 | 3228 | BdrvChild *child; |
aa5a04c7 | 3229 | Transaction *tran = tran_new(); |
f68c598b | 3230 | |
f791bf7f EGE |
3231 | GLOBAL_STATE_CODE(); |
3232 | ||
5bb04747 VSO |
3233 | child = bdrv_attach_child_noperm(parent_bs, child_bs, child_name, |
3234 | child_class, child_role, tran, errp); | |
3235 | if (!child) { | |
3236 | ret = -EINVAL; | |
aa5a04c7 VSO |
3237 | goto out; |
3238 | } | |
d5e6f437 | 3239 | |
f1316edb | 3240 | ret = bdrv_refresh_perms(parent_bs, tran, errp); |
aa5a04c7 VSO |
3241 | if (ret < 0) { |
3242 | goto out; | |
d5e6f437 KW |
3243 | } |
3244 | ||
aa5a04c7 VSO |
3245 | out: |
3246 | tran_finalize(tran, ret); | |
3247 | ||
afdaeb9e | 3248 | bdrv_schedule_unref(child_bs); |
aa5a04c7 | 3249 | |
5bb04747 | 3250 | return ret < 0 ? NULL : child; |
f21d96d0 KW |
3251 | } |
3252 | ||
7b99a266 | 3253 | /* Callers must ensure that child->frozen is false. */ |
f21d96d0 | 3254 | void bdrv_root_unref_child(BdrvChild *child) |
33a60407 | 3255 | { |
00eb93b5 | 3256 | BlockDriverState *child_bs = child->bs; |
779020cb | 3257 | |
f791bf7f | 3258 | GLOBAL_STATE_CODE(); |
00eb93b5 VSO |
3259 | bdrv_replace_child_noperm(child, NULL); |
3260 | bdrv_child_free(child); | |
3261 | ||
3262 | if (child_bs) { | |
3263 | /* | |
3264 | * Update permissions for old node. We're just taking a parent away, so | |
3265 | * we're loosening restrictions. Errors of permission update are not | |
3266 | * fatal in this case, ignore them. | |
3267 | */ | |
f1316edb | 3268 | bdrv_refresh_perms(child_bs, NULL, NULL); |
00eb93b5 VSO |
3269 | |
3270 | /* | |
3271 | * When the parent requiring a non-default AioContext is removed, the | |
3272 | * node moves back to the main AioContext | |
3273 | */ | |
3274 | bdrv_try_change_aio_context(child_bs, qemu_get_aio_context(), NULL, | |
3275 | NULL); | |
3276 | } | |
f791bf7f | 3277 | |
ede01e46 | 3278 | bdrv_schedule_unref(child_bs); |
f21d96d0 KW |
3279 | } |
3280 | ||
332b3a17 VSO |
3281 | typedef struct BdrvSetInheritsFrom { |
3282 | BlockDriverState *bs; | |
3283 | BlockDriverState *old_inherits_from; | |
3284 | } BdrvSetInheritsFrom; | |
3285 | ||
3286 | static void bdrv_set_inherits_from_abort(void *opaque) | |
3287 | { | |
3288 | BdrvSetInheritsFrom *s = opaque; | |
3289 | ||
3290 | s->bs->inherits_from = s->old_inherits_from; | |
3291 | } | |
3292 | ||
3293 | static TransactionActionDrv bdrv_set_inherits_from_drv = { | |
3294 | .abort = bdrv_set_inherits_from_abort, | |
3295 | .clean = g_free, | |
3296 | }; | |
3297 | ||
3298 | /* @tran is allowed to be NULL. In this case no rollback is possible */ | |
3299 | static void bdrv_set_inherits_from(BlockDriverState *bs, | |
3300 | BlockDriverState *new_inherits_from, | |
3301 | Transaction *tran) | |
3302 | { | |
3303 | if (tran) { | |
3304 | BdrvSetInheritsFrom *s = g_new(BdrvSetInheritsFrom, 1); | |
3305 | ||
3306 | *s = (BdrvSetInheritsFrom) { | |
3307 | .bs = bs, | |
3308 | .old_inherits_from = bs->inherits_from, | |
3309 | }; | |
3310 | ||
3311 | tran_add(tran, &bdrv_set_inherits_from_drv, s); | |
3312 | } | |
3313 | ||
3314 | bs->inherits_from = new_inherits_from; | |
3315 | } | |
3316 | ||
3cf746b3 HR |
3317 | /** |
3318 | * Clear all inherits_from pointers from children and grandchildren of | |
3319 | * @root that point to @root, where necessary. | |
332b3a17 | 3320 | * @tran is allowed to be NULL. In this case no rollback is possible |
3cf746b3 | 3321 | */ |
32a8aba3 KW |
3322 | static void GRAPH_WRLOCK |
3323 | bdrv_unset_inherits_from(BlockDriverState *root, BdrvChild *child, | |
3324 | Transaction *tran) | |
f21d96d0 | 3325 | { |
3cf746b3 | 3326 | BdrvChild *c; |
4e4bf5c4 | 3327 | |
3cf746b3 HR |
3328 | if (child->bs->inherits_from == root) { |
3329 | /* | |
3330 | * Remove inherits_from only when the last reference between root and | |
3331 | * child->bs goes away. | |
3332 | */ | |
3333 | QLIST_FOREACH(c, &root->children, next) { | |
4e4bf5c4 KW |
3334 | if (c != child && c->bs == child->bs) { |
3335 | break; | |
3336 | } | |
3337 | } | |
3338 | if (c == NULL) { | |
332b3a17 | 3339 | bdrv_set_inherits_from(child->bs, NULL, tran); |
4e4bf5c4 | 3340 | } |
33a60407 KW |
3341 | } |
3342 | ||
3cf746b3 | 3343 | QLIST_FOREACH(c, &child->bs->children, next) { |
332b3a17 | 3344 | bdrv_unset_inherits_from(root, c, tran); |
3cf746b3 HR |
3345 | } |
3346 | } | |
3347 | ||
7b99a266 | 3348 | /* Callers must ensure that child->frozen is false. */ |
3cf746b3 HR |
3349 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
3350 | { | |
f791bf7f | 3351 | GLOBAL_STATE_CODE(); |
3cf746b3 HR |
3352 | if (child == NULL) { |
3353 | return; | |
3354 | } | |
3355 | ||
332b3a17 | 3356 | bdrv_unset_inherits_from(parent, child, NULL); |
f21d96d0 | 3357 | bdrv_root_unref_child(child); |
33a60407 KW |
3358 | } |
3359 | ||
5c8cab48 | 3360 | |
356f4ef6 KW |
3361 | static void GRAPH_RDLOCK |
3362 | bdrv_parent_cb_change_media(BlockDriverState *bs, bool load) | |
5c8cab48 KW |
3363 | { |
3364 | BdrvChild *c; | |
f0c28327 | 3365 | GLOBAL_STATE_CODE(); |
5c8cab48 | 3366 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
bd86fb99 HR |
3367 | if (c->klass->change_media) { |
3368 | c->klass->change_media(c, load); | |
5c8cab48 KW |
3369 | } |
3370 | } | |
3371 | } | |
3372 | ||
0065c455 AG |
3373 | /* Return true if you can reach parent going through child->inherits_from |
3374 | * recursively. If parent or child are NULL, return false */ | |
3375 | static bool bdrv_inherits_from_recursive(BlockDriverState *child, | |
3376 | BlockDriverState *parent) | |
3377 | { | |
3378 | while (child && child != parent) { | |
3379 | child = child->inherits_from; | |
3380 | } | |
3381 | ||
3382 | return child != NULL; | |
3383 | } | |
3384 | ||
25191e5f HR |
3385 | /* |
3386 | * Return the BdrvChildRole for @bs's backing child. bs->backing is | |
3387 | * mostly used for COW backing children (role = COW), but also for | |
3388 | * filtered children (role = FILTERED | PRIMARY). | |
3389 | */ | |
3390 | static BdrvChildRole bdrv_backing_role(BlockDriverState *bs) | |
3391 | { | |
3392 | if (bs->drv && bs->drv->is_filter) { | |
3393 | return BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; | |
3394 | } else { | |
3395 | return BDRV_CHILD_COW; | |
3396 | } | |
3397 | } | |
3398 | ||
5db15a57 | 3399 | /* |
e9238278 VSO |
3400 | * Sets the bs->backing or bs->file link of a BDS. A new reference is created; |
3401 | * callers which don't need their own reference any more must call bdrv_unref(). | |
7ec390d5 | 3402 | * |
7d4ca9d2 KW |
3403 | * If the respective child is already present (i.e. we're detaching a node), |
3404 | * that child node must be drained. | |
3405 | * | |
7ec390d5 | 3406 | * Function doesn't update permissions, caller is responsible for this. |
4b408668 | 3407 | * |
23c983c8 SH |
3408 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
3409 | * function. | |
5661a00d KW |
3410 | * |
3411 | * After calling this function, the transaction @tran may only be completed | |
3412 | * while holding a writer lock for the graph. | |
5db15a57 | 3413 | */ |
7d4ca9d2 KW |
3414 | static int GRAPH_WRLOCK |
3415 | bdrv_set_file_or_backing_noperm(BlockDriverState *parent_bs, | |
3416 | BlockDriverState *child_bs, | |
3417 | bool is_backing, | |
3418 | Transaction *tran, Error **errp) | |
8d24cce1 | 3419 | { |
e9238278 VSO |
3420 | bool update_inherits_from = |
3421 | bdrv_inherits_from_recursive(child_bs, parent_bs); | |
3422 | BdrvChild *child = is_backing ? parent_bs->backing : parent_bs->file; | |
3423 | BdrvChildRole role; | |
0065c455 | 3424 | |
bdb73476 EGE |
3425 | GLOBAL_STATE_CODE(); |
3426 | ||
e9238278 VSO |
3427 | if (!parent_bs->drv) { |
3428 | /* | |
3429 | * Node without drv is an object without a class :/. TODO: finally fix | |
3430 | * qcow2 driver to never clear bs->drv and implement format corruption | |
3431 | * handling in other way. | |
3432 | */ | |
3433 | error_setg(errp, "Node corrupted"); | |
3434 | return -EINVAL; | |
3435 | } | |
3436 | ||
3437 | if (child && child->frozen) { | |
3438 | error_setg(errp, "Cannot change frozen '%s' link from '%s' to '%s'", | |
3439 | child->name, parent_bs->node_name, child->bs->node_name); | |
a1e708fc | 3440 | return -EPERM; |
2cad1ebe AG |
3441 | } |
3442 | ||
25f78d9e VSO |
3443 | if (is_backing && !parent_bs->drv->is_filter && |
3444 | !parent_bs->drv->supports_backing) | |
3445 | { | |
3446 | error_setg(errp, "Driver '%s' of node '%s' does not support backing " | |
3447 | "files", parent_bs->drv->format_name, parent_bs->node_name); | |
3448 | return -EINVAL; | |
3449 | } | |
3450 | ||
e9238278 VSO |
3451 | if (parent_bs->drv->is_filter) { |
3452 | role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; | |
3453 | } else if (is_backing) { | |
3454 | role = BDRV_CHILD_COW; | |
3455 | } else { | |
3456 | /* | |
3457 | * We only can use same role as it is in existing child. We don't have | |
3458 | * infrastructure to determine role of file child in generic way | |
3459 | */ | |
3460 | if (!child) { | |
3461 | error_setg(errp, "Cannot set file child to format node without " | |
3462 | "file child"); | |
3463 | return -EINVAL; | |
3464 | } | |
3465 | role = child->role; | |
826b6ca0 FZ |
3466 | } |
3467 | ||
e9238278 | 3468 | if (child) { |
7d4ca9d2 | 3469 | assert(child->bs->quiesce_counter); |
e9238278 | 3470 | bdrv_unset_inherits_from(parent_bs, child, tran); |
57f08941 | 3471 | bdrv_remove_child(child, tran); |
e9238278 VSO |
3472 | } |
3473 | ||
3474 | if (!child_bs) { | |
8d24cce1 FZ |
3475 | goto out; |
3476 | } | |
12fa4af6 | 3477 | |
5bb04747 VSO |
3478 | child = bdrv_attach_child_noperm(parent_bs, child_bs, |
3479 | is_backing ? "backing" : "file", | |
3480 | &child_of_bds, role, | |
3481 | tran, errp); | |
3482 | if (!child) { | |
3483 | return -EINVAL; | |
a1e708fc VSO |
3484 | } |
3485 | ||
160333e1 VSO |
3486 | |
3487 | /* | |
e9238278 | 3488 | * If inherits_from pointed recursively to bs then let's update it to |
160333e1 VSO |
3489 | * point directly to bs (else it will become NULL). |
3490 | */ | |
a1e708fc | 3491 | if (update_inherits_from) { |
e9238278 | 3492 | bdrv_set_inherits_from(child_bs, parent_bs, tran); |
0065c455 | 3493 | } |
826b6ca0 | 3494 | |
8d24cce1 | 3495 | out: |
e9238278 | 3496 | bdrv_refresh_limits(parent_bs, tran, NULL); |
160333e1 VSO |
3497 | |
3498 | return 0; | |
3499 | } | |
3500 | ||
4b408668 | 3501 | /* |
23c983c8 SH |
3502 | * Both @bs and @backing_hd can move to a different AioContext in this |
3503 | * function. | |
7d4ca9d2 KW |
3504 | * |
3505 | * If a backing child is already present (i.e. we're detaching a node), that | |
3506 | * child node must be drained. | |
4b408668 | 3507 | */ |
92140b9f KW |
3508 | int bdrv_set_backing_hd_drained(BlockDriverState *bs, |
3509 | BlockDriverState *backing_hd, | |
3510 | Error **errp) | |
160333e1 VSO |
3511 | { |
3512 | int ret; | |
3513 | Transaction *tran = tran_new(); | |
3514 | ||
f791bf7f | 3515 | GLOBAL_STATE_CODE(); |
92140b9f | 3516 | assert(bs->quiesce_counter > 0); |
7d4ca9d2 KW |
3517 | if (bs->backing) { |
3518 | assert(bs->backing->bs->quiesce_counter > 0); | |
3519 | } | |
c0829cb1 | 3520 | |
3204c2e3 | 3521 | ret = bdrv_set_file_or_backing_noperm(bs, backing_hd, true, tran, errp); |
160333e1 VSO |
3522 | if (ret < 0) { |
3523 | goto out; | |
3524 | } | |
3525 | ||
f1316edb | 3526 | ret = bdrv_refresh_perms(bs, tran, errp); |
160333e1 VSO |
3527 | out: |
3528 | tran_finalize(tran, ret); | |
92140b9f KW |
3529 | return ret; |
3530 | } | |
a1e708fc | 3531 | |
92140b9f KW |
3532 | int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
3533 | Error **errp) | |
3534 | { | |
004915a9 | 3535 | BlockDriverState *drain_bs; |
92140b9f KW |
3536 | int ret; |
3537 | GLOBAL_STATE_CODE(); | |
3538 | ||
004915a9 KW |
3539 | bdrv_graph_rdlock_main_loop(); |
3540 | drain_bs = bs->backing ? bs->backing->bs : bs; | |
3541 | bdrv_graph_rdunlock_main_loop(); | |
3542 | ||
7d4ca9d2 KW |
3543 | bdrv_ref(drain_bs); |
3544 | bdrv_drained_begin(drain_bs); | |
6bc30f19 | 3545 | bdrv_graph_wrlock(); |
92140b9f | 3546 | ret = bdrv_set_backing_hd_drained(bs, backing_hd, errp); |
6bc30f19 | 3547 | bdrv_graph_wrunlock(); |
7d4ca9d2 KW |
3548 | bdrv_drained_end(drain_bs); |
3549 | bdrv_unref(drain_bs); | |
c0829cb1 | 3550 | |
a1e708fc | 3551 | return ret; |
8d24cce1 FZ |
3552 | } |
3553 | ||
31ca6d07 KW |
3554 | /* |
3555 | * Opens the backing file for a BlockDriverState if not yet open | |
3556 | * | |
d9b7b057 KW |
3557 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
3558 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
3559 | * itself, all options starting with "${bdref_key}." are considered part of the | |
3560 | * BlockdevRef. | |
3561 | * | |
3562 | * TODO Can this be unified with bdrv_open_image()? | |
31ca6d07 | 3563 | */ |
d9b7b057 KW |
3564 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
3565 | const char *bdref_key, Error **errp) | |
9156df12 | 3566 | { |
6b6833c1 | 3567 | char *backing_filename = NULL; |
d9b7b057 KW |
3568 | char *bdref_key_dot; |
3569 | const char *reference = NULL; | |
317fc44e | 3570 | int ret = 0; |
998c2019 | 3571 | bool implicit_backing = false; |
8d24cce1 | 3572 | BlockDriverState *backing_hd; |
d9b7b057 KW |
3573 | QDict *options; |
3574 | QDict *tmp_parent_options = NULL; | |
34b5d2c6 | 3575 | Error *local_err = NULL; |
9156df12 | 3576 | |
f791bf7f | 3577 | GLOBAL_STATE_CODE(); |
004915a9 | 3578 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f791bf7f | 3579 | |
760e0063 | 3580 | if (bs->backing != NULL) { |
1ba4b6a5 | 3581 | goto free_exit; |
9156df12 PB |
3582 | } |
3583 | ||
31ca6d07 | 3584 | /* NULL means an empty set of options */ |
d9b7b057 KW |
3585 | if (parent_options == NULL) { |
3586 | tmp_parent_options = qdict_new(); | |
3587 | parent_options = tmp_parent_options; | |
31ca6d07 KW |
3588 | } |
3589 | ||
9156df12 | 3590 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
d9b7b057 KW |
3591 | |
3592 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); | |
3593 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); | |
3594 | g_free(bdref_key_dot); | |
3595 | ||
129c7d1c MA |
3596 | /* |
3597 | * Caution: while qdict_get_try_str() is fine, getting non-string | |
3598 | * types would require more care. When @parent_options come from | |
3599 | * -blockdev or blockdev_add, its members are typed according to | |
3600 | * the QAPI schema, but when they come from -drive, they're all | |
3601 | * QString. | |
3602 | */ | |
d9b7b057 KW |
3603 | reference = qdict_get_try_str(parent_options, bdref_key); |
3604 | if (reference || qdict_haskey(options, "file.filename")) { | |
6b6833c1 | 3605 | /* keep backing_filename NULL */ |
1cb6f506 | 3606 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
cb3e7f08 | 3607 | qobject_unref(options); |
1ba4b6a5 | 3608 | goto free_exit; |
dbecebdd | 3609 | } else { |
998c2019 HR |
3610 | if (qdict_size(options) == 0) { |
3611 | /* If the user specifies options that do not modify the | |
3612 | * backing file's behavior, we might still consider it the | |
3613 | * implicit backing file. But it's easier this way, and | |
3614 | * just specifying some of the backing BDS's options is | |
3615 | * only possible with -drive anyway (otherwise the QAPI | |
3616 | * schema forces the user to specify everything). */ | |
3617 | implicit_backing = !strcmp(bs->auto_backing_file, bs->backing_file); | |
3618 | } | |
3619 | ||
6b6833c1 | 3620 | backing_filename = bdrv_get_full_backing_filename(bs, &local_err); |
9f07429e HR |
3621 | if (local_err) { |
3622 | ret = -EINVAL; | |
3623 | error_propagate(errp, local_err); | |
cb3e7f08 | 3624 | qobject_unref(options); |
9f07429e HR |
3625 | goto free_exit; |
3626 | } | |
9156df12 PB |
3627 | } |
3628 | ||
8ee79e70 KW |
3629 | if (!bs->drv || !bs->drv->supports_backing) { |
3630 | ret = -EINVAL; | |
3631 | error_setg(errp, "Driver doesn't support backing files"); | |
cb3e7f08 | 3632 | qobject_unref(options); |
8ee79e70 KW |
3633 | goto free_exit; |
3634 | } | |
3635 | ||
6bff597b PK |
3636 | if (!reference && |
3637 | bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { | |
46f5ac20 | 3638 | qdict_put_str(options, "driver", bs->backing_format); |
9156df12 PB |
3639 | } |
3640 | ||
6b6833c1 | 3641 | backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs, |
25191e5f | 3642 | &child_of_bds, bdrv_backing_role(bs), errp); |
5b363937 | 3643 | if (!backing_hd) { |
9156df12 | 3644 | bs->open_flags |= BDRV_O_NO_BACKING; |
e43bfd9c | 3645 | error_prepend(errp, "Could not open backing file: "); |
5b363937 | 3646 | ret = -EINVAL; |
1ba4b6a5 | 3647 | goto free_exit; |
9156df12 | 3648 | } |
df581792 | 3649 | |
998c2019 HR |
3650 | if (implicit_backing) { |
3651 | bdrv_refresh_filename(backing_hd); | |
3652 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), | |
3653 | backing_hd->filename); | |
3654 | } | |
3655 | ||
5db15a57 KW |
3656 | /* Hook up the backing file link; drop our reference, bs owns the |
3657 | * backing_hd reference now */ | |
dc9c10a1 | 3658 | ret = bdrv_set_backing_hd(bs, backing_hd, errp); |
5db15a57 | 3659 | bdrv_unref(backing_hd); |
8aa04542 | 3660 | |
dc9c10a1 | 3661 | if (ret < 0) { |
12fa4af6 KW |
3662 | goto free_exit; |
3663 | } | |
d80ac658 | 3664 | |
d9b7b057 KW |
3665 | qdict_del(parent_options, bdref_key); |
3666 | ||
1ba4b6a5 BC |
3667 | free_exit: |
3668 | g_free(backing_filename); | |
cb3e7f08 | 3669 | qobject_unref(tmp_parent_options); |
1ba4b6a5 | 3670 | return ret; |
9156df12 PB |
3671 | } |
3672 | ||
2d6b86af KW |
3673 | static BlockDriverState * |
3674 | bdrv_open_child_bs(const char *filename, QDict *options, const char *bdref_key, | |
bd86fb99 | 3675 | BlockDriverState *parent, const BdrvChildClass *child_class, |
272c02ea | 3676 | BdrvChildRole child_role, bool allow_none, Error **errp) |
da557aac | 3677 | { |
2d6b86af | 3678 | BlockDriverState *bs = NULL; |
da557aac | 3679 | QDict *image_options; |
da557aac HR |
3680 | char *bdref_key_dot; |
3681 | const char *reference; | |
3682 | ||
bd86fb99 | 3683 | assert(child_class != NULL); |
f67503e5 | 3684 | |
da557aac HR |
3685 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
3686 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
3687 | g_free(bdref_key_dot); | |
3688 | ||
129c7d1c MA |
3689 | /* |
3690 | * Caution: while qdict_get_try_str() is fine, getting non-string | |
3691 | * types would require more care. When @options come from | |
3692 | * -blockdev or blockdev_add, its members are typed according to | |
3693 | * the QAPI schema, but when they come from -drive, they're all | |
3694 | * QString. | |
3695 | */ | |
da557aac HR |
3696 | reference = qdict_get_try_str(options, bdref_key); |
3697 | if (!filename && !reference && !qdict_size(image_options)) { | |
b4b059f6 | 3698 | if (!allow_none) { |
da557aac HR |
3699 | error_setg(errp, "A block device must be specified for \"%s\"", |
3700 | bdref_key); | |
da557aac | 3701 | } |
cb3e7f08 | 3702 | qobject_unref(image_options); |
da557aac HR |
3703 | goto done; |
3704 | } | |
3705 | ||
5b363937 | 3706 | bs = bdrv_open_inherit(filename, reference, image_options, 0, |
272c02ea | 3707 | parent, child_class, child_role, errp); |
5b363937 | 3708 | if (!bs) { |
df581792 KW |
3709 | goto done; |
3710 | } | |
3711 | ||
da557aac HR |
3712 | done: |
3713 | qdict_del(options, bdref_key); | |
2d6b86af KW |
3714 | return bs; |
3715 | } | |
3716 | ||
3717 | /* | |
3718 | * Opens a disk image whose options are given as BlockdevRef in another block | |
3719 | * device's options. | |
3720 | * | |
3721 | * If allow_none is true, no image will be opened if filename is false and no | |
3722 | * BlockdevRef is given. NULL will be returned, but errp remains unset. | |
3723 | * | |
3724 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
3725 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
3726 | * itself, all options starting with "${bdref_key}." are considered part of the | |
3727 | * BlockdevRef. | |
3728 | * | |
3729 | * The BlockdevRef will be removed from the options QDict. | |
aa269ff8 | 3730 | * |
23c983c8 | 3731 | * @parent can move to a different AioContext in this function. |
2d6b86af KW |
3732 | */ |
3733 | BdrvChild *bdrv_open_child(const char *filename, | |
3734 | QDict *options, const char *bdref_key, | |
3735 | BlockDriverState *parent, | |
bd86fb99 | 3736 | const BdrvChildClass *child_class, |
258b7765 | 3737 | BdrvChildRole child_role, |
2d6b86af KW |
3738 | bool allow_none, Error **errp) |
3739 | { | |
3740 | BlockDriverState *bs; | |
8394c35e | 3741 | BdrvChild *child; |
2d6b86af | 3742 | |
f791bf7f EGE |
3743 | GLOBAL_STATE_CODE(); |
3744 | ||
bd86fb99 | 3745 | bs = bdrv_open_child_bs(filename, options, bdref_key, parent, child_class, |
272c02ea | 3746 | child_role, allow_none, errp); |
2d6b86af KW |
3747 | if (bs == NULL) { |
3748 | return NULL; | |
3749 | } | |
3750 | ||
6bc30f19 | 3751 | bdrv_graph_wrlock(); |
8394c35e KW |
3752 | child = bdrv_attach_child(parent, bs, bdref_key, child_class, child_role, |
3753 | errp); | |
6bc30f19 | 3754 | bdrv_graph_wrunlock(); |
8394c35e KW |
3755 | |
3756 | return child; | |
b4b059f6 KW |
3757 | } |
3758 | ||
83930780 VSO |
3759 | /* |
3760 | * Wrapper on bdrv_open_child() for most popular case: open primary child of bs. | |
aa269ff8 | 3761 | * |
23c983c8 | 3762 | * @parent can move to a different AioContext in this function. |
83930780 VSO |
3763 | */ |
3764 | int bdrv_open_file_child(const char *filename, | |
3765 | QDict *options, const char *bdref_key, | |
3766 | BlockDriverState *parent, Error **errp) | |
3767 | { | |
3768 | BdrvChildRole role; | |
3769 | ||
3770 | /* commit_top and mirror_top don't use this function */ | |
3771 | assert(!parent->drv->filtered_child_is_backing); | |
83930780 VSO |
3772 | role = parent->drv->is_filter ? |
3773 | (BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY) : BDRV_CHILD_IMAGE; | |
3774 | ||
5bb04747 VSO |
3775 | if (!bdrv_open_child(filename, options, bdref_key, parent, |
3776 | &child_of_bds, role, false, errp)) | |
3777 | { | |
3778 | return -EINVAL; | |
3779 | } | |
83930780 | 3780 | |
5bb04747 | 3781 | return 0; |
83930780 VSO |
3782 | } |
3783 | ||
bd86fb99 HR |
3784 | /* |
3785 | * TODO Future callers may need to specify parent/child_class in order for | |
3786 | * option inheritance to work. Existing callers use it for the root node. | |
3787 | */ | |
e1d74bc6 KW |
3788 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp) |
3789 | { | |
3790 | BlockDriverState *bs = NULL; | |
e1d74bc6 KW |
3791 | QObject *obj = NULL; |
3792 | QDict *qdict = NULL; | |
3793 | const char *reference = NULL; | |
3794 | Visitor *v = NULL; | |
3795 | ||
f791bf7f EGE |
3796 | GLOBAL_STATE_CODE(); |
3797 | ||
e1d74bc6 KW |
3798 | if (ref->type == QTYPE_QSTRING) { |
3799 | reference = ref->u.reference; | |
3800 | } else { | |
3801 | BlockdevOptions *options = &ref->u.definition; | |
3802 | assert(ref->type == QTYPE_QDICT); | |
3803 | ||
3804 | v = qobject_output_visitor_new(&obj); | |
1f584248 | 3805 | visit_type_BlockdevOptions(v, NULL, &options, &error_abort); |
e1d74bc6 KW |
3806 | visit_complete(v, &obj); |
3807 | ||
7dc847eb | 3808 | qdict = qobject_to(QDict, obj); |
e1d74bc6 KW |
3809 | qdict_flatten(qdict); |
3810 | ||
3811 | /* bdrv_open_inherit() defaults to the values in bdrv_flags (for | |
3812 | * compatibility with other callers) rather than what we want as the | |
3813 | * real defaults. Apply the defaults here instead. */ | |
3814 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_DIRECT, "off"); | |
3815 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_NO_FLUSH, "off"); | |
3816 | qdict_set_default_str(qdict, BDRV_OPT_READ_ONLY, "off"); | |
e35bdc12 KW |
3817 | qdict_set_default_str(qdict, BDRV_OPT_AUTO_READ_ONLY, "off"); |
3818 | ||
e1d74bc6 KW |
3819 | } |
3820 | ||
272c02ea | 3821 | bs = bdrv_open_inherit(NULL, reference, qdict, 0, NULL, NULL, 0, errp); |
e1d74bc6 | 3822 | obj = NULL; |
cb3e7f08 | 3823 | qobject_unref(obj); |
e1d74bc6 KW |
3824 | visit_free(v); |
3825 | return bs; | |
3826 | } | |
3827 | ||
66836189 HR |
3828 | static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, |
3829 | int flags, | |
3830 | QDict *snapshot_options, | |
3831 | Error **errp) | |
b998875d | 3832 | { |
69fbfff9 | 3833 | g_autofree char *tmp_filename = NULL; |
b998875d | 3834 | int64_t total_size; |
83d0521a | 3835 | QemuOpts *opts = NULL; |
ff6ed714 | 3836 | BlockDriverState *bs_snapshot = NULL; |
b998875d KW |
3837 | int ret; |
3838 | ||
bdb73476 EGE |
3839 | GLOBAL_STATE_CODE(); |
3840 | ||
b998875d KW |
3841 | /* if snapshot, we create a temporary backing file and open it |
3842 | instead of opening 'filename' directly */ | |
3843 | ||
3844 | /* Get the required size from the image */ | |
f187743a | 3845 | total_size = bdrv_getlength(bs); |
f665f01f | 3846 | |
f187743a KW |
3847 | if (total_size < 0) { |
3848 | error_setg_errno(errp, -total_size, "Could not get image size"); | |
1ba4b6a5 | 3849 | goto out; |
f187743a | 3850 | } |
b998875d KW |
3851 | |
3852 | /* Create the temporary image */ | |
69fbfff9 BM |
3853 | tmp_filename = create_tmp_file(errp); |
3854 | if (!tmp_filename) { | |
1ba4b6a5 | 3855 | goto out; |
b998875d KW |
3856 | } |
3857 | ||
ef810437 | 3858 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
c282e1fd | 3859 | &error_abort); |
39101f25 | 3860 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
e43bfd9c | 3861 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
83d0521a | 3862 | qemu_opts_del(opts); |
b998875d | 3863 | if (ret < 0) { |
e43bfd9c MA |
3864 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
3865 | tmp_filename); | |
1ba4b6a5 | 3866 | goto out; |
b998875d KW |
3867 | } |
3868 | ||
73176bee | 3869 | /* Prepare options QDict for the temporary file */ |
46f5ac20 EB |
3870 | qdict_put_str(snapshot_options, "file.driver", "file"); |
3871 | qdict_put_str(snapshot_options, "file.filename", tmp_filename); | |
3872 | qdict_put_str(snapshot_options, "driver", "qcow2"); | |
b998875d | 3873 | |
5b363937 | 3874 | bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp); |
73176bee | 3875 | snapshot_options = NULL; |
5b363937 | 3876 | if (!bs_snapshot) { |
1ba4b6a5 | 3877 | goto out; |
b998875d KW |
3878 | } |
3879 | ||
934aee14 VSO |
3880 | ret = bdrv_append(bs_snapshot, bs, errp); |
3881 | if (ret < 0) { | |
ff6ed714 | 3882 | bs_snapshot = NULL; |
b2c2832c KW |
3883 | goto out; |
3884 | } | |
1ba4b6a5 BC |
3885 | |
3886 | out: | |
cb3e7f08 | 3887 | qobject_unref(snapshot_options); |
ff6ed714 | 3888 | return bs_snapshot; |
b998875d KW |
3889 | } |
3890 | ||
b6ce07aa KW |
3891 | /* |
3892 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
3893 | * |
3894 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
3895 | * empty set of options. The reference to the QDict belongs to the block layer | |
3896 | * after the call (even on failure), so if the caller intends to reuse the | |
cb3e7f08 | 3897 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
f67503e5 HR |
3898 | * |
3899 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
3900 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
3901 | * |
3902 | * The reference parameter may be used to specify an existing block device which | |
3903 | * should be opened. If specified, neither options nor a filename may be given, | |
3904 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 3905 | */ |
32192301 KW |
3906 | static BlockDriverState * no_coroutine_fn |
3907 | bdrv_open_inherit(const char *filename, const char *reference, QDict *options, | |
3908 | int flags, BlockDriverState *parent, | |
3909 | const BdrvChildClass *child_class, BdrvChildRole child_role, | |
3910 | Error **errp) | |
ea2384d3 | 3911 | { |
b6ce07aa | 3912 | int ret; |
5696c6e3 | 3913 | BlockBackend *file = NULL; |
9a4f4c31 | 3914 | BlockDriverState *bs; |
ce343771 | 3915 | BlockDriver *drv = NULL; |
2f624b80 | 3916 | BdrvChild *child; |
74fe54f2 | 3917 | const char *drvname; |
3e8c2e57 | 3918 | const char *backing; |
34b5d2c6 | 3919 | Error *local_err = NULL; |
73176bee | 3920 | QDict *snapshot_options = NULL; |
b1e6fc08 | 3921 | int snapshot_flags = 0; |
712e7874 | 3922 | |
bd86fb99 HR |
3923 | assert(!child_class || !flags); |
3924 | assert(!child_class == !parent); | |
f0c28327 | 3925 | GLOBAL_STATE_CODE(); |
32192301 | 3926 | assert(!qemu_in_coroutine()); |
f67503e5 | 3927 | |
356f4ef6 KW |
3928 | /* TODO We'll eventually have to take a writer lock in this function */ |
3929 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
3930 | ||
ddf5636d HR |
3931 | if (reference) { |
3932 | bool options_non_empty = options ? qdict_size(options) : false; | |
cb3e7f08 | 3933 | qobject_unref(options); |
ddf5636d | 3934 | |
ddf5636d HR |
3935 | if (filename || options_non_empty) { |
3936 | error_setg(errp, "Cannot reference an existing block device with " | |
3937 | "additional options or a new filename"); | |
5b363937 | 3938 | return NULL; |
ddf5636d HR |
3939 | } |
3940 | ||
3941 | bs = bdrv_lookup_bs(reference, reference, errp); | |
3942 | if (!bs) { | |
5b363937 | 3943 | return NULL; |
ddf5636d | 3944 | } |
76b22320 | 3945 | |
ddf5636d | 3946 | bdrv_ref(bs); |
5b363937 | 3947 | return bs; |
ddf5636d HR |
3948 | } |
3949 | ||
5b363937 | 3950 | bs = bdrv_new(); |
f67503e5 | 3951 | |
de9c0cec KW |
3952 | /* NULL means an empty set of options */ |
3953 | if (options == NULL) { | |
3954 | options = qdict_new(); | |
3955 | } | |
3956 | ||
145f598e | 3957 | /* json: syntax counts as explicit options, as if in the QDict */ |
de3b53f0 KW |
3958 | parse_json_protocol(options, &filename, &local_err); |
3959 | if (local_err) { | |
de3b53f0 KW |
3960 | goto fail; |
3961 | } | |
3962 | ||
145f598e KW |
3963 | bs->explicit_options = qdict_clone_shallow(options); |
3964 | ||
bd86fb99 | 3965 | if (child_class) { |
3cdc69d3 HR |
3966 | bool parent_is_format; |
3967 | ||
3968 | if (parent->drv) { | |
3969 | parent_is_format = parent->drv->is_format; | |
3970 | } else { | |
3971 | /* | |
3972 | * parent->drv is not set yet because this node is opened for | |
3973 | * (potential) format probing. That means that @parent is going | |
3974 | * to be a format node. | |
3975 | */ | |
3976 | parent_is_format = true; | |
3977 | } | |
3978 | ||
bddcec37 | 3979 | bs->inherits_from = parent; |
3cdc69d3 HR |
3980 | child_class->inherit_options(child_role, parent_is_format, |
3981 | &flags, options, | |
bd86fb99 | 3982 | parent->open_flags, parent->options); |
f3930ed0 KW |
3983 | } |
3984 | ||
de3b53f0 | 3985 | ret = bdrv_fill_options(&options, filename, &flags, &local_err); |
dfde483e | 3986 | if (ret < 0) { |
462f5bcf KW |
3987 | goto fail; |
3988 | } | |
3989 | ||
129c7d1c MA |
3990 | /* |
3991 | * Set the BDRV_O_RDWR and BDRV_O_ALLOW_RDWR flags. | |
3992 | * Caution: getting a boolean member of @options requires care. | |
3993 | * When @options come from -blockdev or blockdev_add, members are | |
3994 | * typed according to the QAPI schema, but when they come from | |
3995 | * -drive, they're all QString. | |
3996 | */ | |
f87a0e29 AG |
3997 | if (g_strcmp0(qdict_get_try_str(options, BDRV_OPT_READ_ONLY), "on") && |
3998 | !qdict_get_try_bool(options, BDRV_OPT_READ_ONLY, false)) { | |
3999 | flags |= (BDRV_O_RDWR | BDRV_O_ALLOW_RDWR); | |
4000 | } else { | |
4001 | flags &= ~BDRV_O_RDWR; | |
14499ea5 AG |
4002 | } |
4003 | ||
4004 | if (flags & BDRV_O_SNAPSHOT) { | |
4005 | snapshot_options = qdict_new(); | |
4006 | bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, | |
4007 | flags, options); | |
f87a0e29 AG |
4008 | /* Let bdrv_backing_options() override "read-only" */ |
4009 | qdict_del(options, BDRV_OPT_READ_ONLY); | |
00ff7ffd HR |
4010 | bdrv_inherited_options(BDRV_CHILD_COW, true, |
4011 | &flags, options, flags, options); | |
14499ea5 AG |
4012 | } |
4013 | ||
62392ebb KW |
4014 | bs->open_flags = flags; |
4015 | bs->options = options; | |
4016 | options = qdict_clone_shallow(options); | |
4017 | ||
76c591b0 | 4018 | /* Find the right image format driver */ |
129c7d1c | 4019 | /* See cautionary note on accessing @options above */ |
76c591b0 KW |
4020 | drvname = qdict_get_try_str(options, "driver"); |
4021 | if (drvname) { | |
4022 | drv = bdrv_find_format(drvname); | |
76c591b0 KW |
4023 | if (!drv) { |
4024 | error_setg(errp, "Unknown driver: '%s'", drvname); | |
76c591b0 KW |
4025 | goto fail; |
4026 | } | |
4027 | } | |
4028 | ||
4029 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); | |
76c591b0 | 4030 | |
129c7d1c | 4031 | /* See cautionary note on accessing @options above */ |
3e8c2e57 | 4032 | backing = qdict_get_try_str(options, "backing"); |
e59a0cf1 HR |
4033 | if (qobject_to(QNull, qdict_get(options, "backing")) != NULL || |
4034 | (backing && *backing == '\0')) | |
4035 | { | |
4f7be280 HR |
4036 | if (backing) { |
4037 | warn_report("Use of \"backing\": \"\" is deprecated; " | |
4038 | "use \"backing\": null instead"); | |
4039 | } | |
3e8c2e57 | 4040 | flags |= BDRV_O_NO_BACKING; |
ae0f57f0 KW |
4041 | qdict_del(bs->explicit_options, "backing"); |
4042 | qdict_del(bs->options, "backing"); | |
3e8c2e57 AG |
4043 | qdict_del(options, "backing"); |
4044 | } | |
4045 | ||
5696c6e3 | 4046 | /* Open image file without format layer. This BlockBackend is only used for |
4e4bf5c4 KW |
4047 | * probing, the block drivers will do their own bdrv_open_child() for the |
4048 | * same BDS, which is why we put the node name back into options. */ | |
f4788adc | 4049 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
5696c6e3 KW |
4050 | BlockDriverState *file_bs; |
4051 | ||
4052 | file_bs = bdrv_open_child_bs(filename, options, "file", bs, | |
58944401 HR |
4053 | &child_of_bds, BDRV_CHILD_IMAGE, |
4054 | true, &local_err); | |
1fdd6933 | 4055 | if (local_err) { |
f4788adc KW |
4056 | goto fail; |
4057 | } | |
5696c6e3 | 4058 | if (file_bs != NULL) { |
dacaa162 KW |
4059 | /* Not requesting BLK_PERM_CONSISTENT_READ because we're only |
4060 | * looking at the header to guess the image format. This works even | |
4061 | * in cases where a guest would not see a consistent state. */ | |
b49f4755 | 4062 | AioContext *ctx = bdrv_get_aio_context(file_bs); |
f665f01f | 4063 | file = blk_new(ctx, 0, BLK_PERM_ALL); |
d7086422 | 4064 | blk_insert_bs(file, file_bs, &local_err); |
5696c6e3 | 4065 | bdrv_unref(file_bs); |
f665f01f | 4066 | |
d7086422 KW |
4067 | if (local_err) { |
4068 | goto fail; | |
4069 | } | |
5696c6e3 | 4070 | |
46f5ac20 | 4071 | qdict_put_str(options, "file", bdrv_get_node_name(file_bs)); |
4e4bf5c4 | 4072 | } |
f500a6d3 KW |
4073 | } |
4074 | ||
76c591b0 | 4075 | /* Image format probing */ |
38f3ef57 | 4076 | bs->probed = !drv; |
76c591b0 | 4077 | if (!drv && file) { |
cf2ab8fc | 4078 | ret = find_image_format(file, filename, &drv, &local_err); |
17b005f1 | 4079 | if (ret < 0) { |
8bfea15d | 4080 | goto fail; |
2a05cbe4 | 4081 | } |
62392ebb KW |
4082 | /* |
4083 | * This option update would logically belong in bdrv_fill_options(), | |
4084 | * but we first need to open bs->file for the probing to work, while | |
4085 | * opening bs->file already requires the (mostly) final set of options | |
4086 | * so that cache mode etc. can be inherited. | |
4087 | * | |
4088 | * Adding the driver later is somewhat ugly, but it's not an option | |
4089 | * that would ever be inherited, so it's correct. We just need to make | |
4090 | * sure to update both bs->options (which has the full effective | |
4091 | * options for bs) and options (which has file.* already removed). | |
4092 | */ | |
46f5ac20 EB |
4093 | qdict_put_str(bs->options, "driver", drv->format_name); |
4094 | qdict_put_str(options, "driver", drv->format_name); | |
76c591b0 | 4095 | } else if (!drv) { |
17b005f1 | 4096 | error_setg(errp, "Must specify either driver or file"); |
8bfea15d | 4097 | goto fail; |
ea2384d3 | 4098 | } |
b6ce07aa | 4099 | |
53a29513 HR |
4100 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
4101 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); | |
4102 | /* file must be NULL if a protocol BDS is about to be created | |
4103 | * (the inverse results in an error message from bdrv_open_common()) */ | |
4104 | assert(!(flags & BDRV_O_PROTOCOL) || !file); | |
4105 | ||
b6ce07aa | 4106 | /* Open the image */ |
82dc8b41 | 4107 | ret = bdrv_open_common(bs, file, options, &local_err); |
b6ce07aa | 4108 | if (ret < 0) { |
8bfea15d | 4109 | goto fail; |
6987307c CH |
4110 | } |
4111 | ||
4e4bf5c4 | 4112 | if (file) { |
5696c6e3 | 4113 | blk_unref(file); |
f500a6d3 KW |
4114 | file = NULL; |
4115 | } | |
4116 | ||
b6ce07aa | 4117 | /* If there is a backing file, use it */ |
9156df12 | 4118 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
d9b7b057 | 4119 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
b6ce07aa | 4120 | if (ret < 0) { |
b6ad491a | 4121 | goto close_and_fail; |
b6ce07aa | 4122 | } |
b6ce07aa KW |
4123 | } |
4124 | ||
50196d7a AG |
4125 | /* Remove all children options and references |
4126 | * from bs->options and bs->explicit_options */ | |
2f624b80 AG |
4127 | QLIST_FOREACH(child, &bs->children, next) { |
4128 | char *child_key_dot; | |
4129 | child_key_dot = g_strdup_printf("%s.", child->name); | |
4130 | qdict_extract_subqdict(bs->explicit_options, NULL, child_key_dot); | |
4131 | qdict_extract_subqdict(bs->options, NULL, child_key_dot); | |
50196d7a AG |
4132 | qdict_del(bs->explicit_options, child->name); |
4133 | qdict_del(bs->options, child->name); | |
2f624b80 AG |
4134 | g_free(child_key_dot); |
4135 | } | |
4136 | ||
b6ad491a | 4137 | /* Check if any unknown options were used */ |
7ad2757f | 4138 | if (qdict_size(options) != 0) { |
b6ad491a | 4139 | const QDictEntry *entry = qdict_first(options); |
5acd9d81 HR |
4140 | if (flags & BDRV_O_PROTOCOL) { |
4141 | error_setg(errp, "Block protocol '%s' doesn't support the option " | |
4142 | "'%s'", drv->format_name, entry->key); | |
4143 | } else { | |
d0e46a55 HR |
4144 | error_setg(errp, |
4145 | "Block format '%s' does not support the option '%s'", | |
4146 | drv->format_name, entry->key); | |
5acd9d81 | 4147 | } |
b6ad491a | 4148 | |
b6ad491a KW |
4149 | goto close_and_fail; |
4150 | } | |
b6ad491a | 4151 | |
c01c214b | 4152 | bdrv_parent_cb_change_media(bs, true); |
b6ce07aa | 4153 | |
cb3e7f08 | 4154 | qobject_unref(options); |
8961be33 | 4155 | options = NULL; |
dd62f1ca KW |
4156 | |
4157 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the | |
4158 | * temporary snapshot afterwards. */ | |
4159 | if (snapshot_flags) { | |
66836189 HR |
4160 | BlockDriverState *snapshot_bs; |
4161 | snapshot_bs = bdrv_append_temp_snapshot(bs, snapshot_flags, | |
4162 | snapshot_options, &local_err); | |
73176bee | 4163 | snapshot_options = NULL; |
dd62f1ca KW |
4164 | if (local_err) { |
4165 | goto close_and_fail; | |
4166 | } | |
5b363937 HR |
4167 | /* We are not going to return bs but the overlay on top of it |
4168 | * (snapshot_bs); thus, we have to drop the strong reference to bs | |
4169 | * (which we obtained by calling bdrv_new()). bs will not be deleted, | |
4170 | * though, because the overlay still has a reference to it. */ | |
4171 | bdrv_unref(bs); | |
4172 | bs = snapshot_bs; | |
dd62f1ca KW |
4173 | } |
4174 | ||
5b363937 | 4175 | return bs; |
b6ce07aa | 4176 | |
8bfea15d | 4177 | fail: |
5696c6e3 | 4178 | blk_unref(file); |
cb3e7f08 MAL |
4179 | qobject_unref(snapshot_options); |
4180 | qobject_unref(bs->explicit_options); | |
4181 | qobject_unref(bs->options); | |
4182 | qobject_unref(options); | |
de9c0cec | 4183 | bs->options = NULL; |
998cbd6a | 4184 | bs->explicit_options = NULL; |
5b363937 | 4185 | bdrv_unref(bs); |
621ff94d | 4186 | error_propagate(errp, local_err); |
5b363937 | 4187 | return NULL; |
de9c0cec | 4188 | |
b6ad491a | 4189 | close_and_fail: |
5b363937 | 4190 | bdrv_unref(bs); |
cb3e7f08 MAL |
4191 | qobject_unref(snapshot_options); |
4192 | qobject_unref(options); | |
621ff94d | 4193 | error_propagate(errp, local_err); |
5b363937 | 4194 | return NULL; |
b6ce07aa KW |
4195 | } |
4196 | ||
5b363937 HR |
4197 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
4198 | QDict *options, int flags, Error **errp) | |
f3930ed0 | 4199 | { |
f791bf7f EGE |
4200 | GLOBAL_STATE_CODE(); |
4201 | ||
5b363937 | 4202 | return bdrv_open_inherit(filename, reference, options, flags, NULL, |
272c02ea | 4203 | NULL, 0, errp); |
f3930ed0 KW |
4204 | } |
4205 | ||
faf116b4 AG |
4206 | /* Return true if the NULL-terminated @list contains @str */ |
4207 | static bool is_str_in_list(const char *str, const char *const *list) | |
4208 | { | |
4209 | if (str && list) { | |
4210 | int i; | |
4211 | for (i = 0; list[i] != NULL; i++) { | |
4212 | if (!strcmp(str, list[i])) { | |
4213 | return true; | |
4214 | } | |
4215 | } | |
4216 | } | |
4217 | return false; | |
4218 | } | |
4219 | ||
4220 | /* | |
4221 | * Check that every option set in @bs->options is also set in | |
4222 | * @new_opts. | |
4223 | * | |
4224 | * Options listed in the common_options list and in | |
4225 | * @bs->drv->mutable_opts are skipped. | |
4226 | * | |
4227 | * Return 0 on success, otherwise return -EINVAL and set @errp. | |
4228 | */ | |
4229 | static int bdrv_reset_options_allowed(BlockDriverState *bs, | |
4230 | const QDict *new_opts, Error **errp) | |
4231 | { | |
4232 | const QDictEntry *e; | |
4233 | /* These options are common to all block drivers and are handled | |
4234 | * in bdrv_reopen_prepare() so they can be left out of @new_opts */ | |
4235 | const char *const common_options[] = { | |
4236 | "node-name", "discard", "cache.direct", "cache.no-flush", | |
4237 | "read-only", "auto-read-only", "detect-zeroes", NULL | |
4238 | }; | |
4239 | ||
4240 | for (e = qdict_first(bs->options); e; e = qdict_next(bs->options, e)) { | |
4241 | if (!qdict_haskey(new_opts, e->key) && | |
4242 | !is_str_in_list(e->key, common_options) && | |
4243 | !is_str_in_list(e->key, bs->drv->mutable_opts)) { | |
4244 | error_setg(errp, "Option '%s' cannot be reset " | |
4245 | "to its default value", e->key); | |
4246 | return -EINVAL; | |
4247 | } | |
4248 | } | |
4249 | ||
4250 | return 0; | |
4251 | } | |
4252 | ||
cb828c31 AG |
4253 | /* |
4254 | * Returns true if @child can be reached recursively from @bs | |
4255 | */ | |
ce433d29 KW |
4256 | static bool GRAPH_RDLOCK |
4257 | bdrv_recurse_has_child(BlockDriverState *bs, BlockDriverState *child) | |
cb828c31 AG |
4258 | { |
4259 | BdrvChild *c; | |
4260 | ||
4261 | if (bs == child) { | |
4262 | return true; | |
4263 | } | |
4264 | ||
4265 | QLIST_FOREACH(c, &bs->children, next) { | |
4266 | if (bdrv_recurse_has_child(c->bs, child)) { | |
4267 | return true; | |
4268 | } | |
4269 | } | |
4270 | ||
4271 | return false; | |
4272 | } | |
4273 | ||
e971aa12 JC |
4274 | /* |
4275 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
4276 | * reopen of multiple devices. | |
4277 | * | |
859443b0 | 4278 | * bs_queue can either be an existing BlockReopenQueue that has had QTAILQ_INIT |
e971aa12 JC |
4279 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
4280 | * be created and initialized. This newly created BlockReopenQueue should be | |
4281 | * passed back in for subsequent calls that are intended to be of the same | |
4282 | * atomic 'set'. | |
4283 | * | |
4284 | * bs is the BlockDriverState to add to the reopen queue. | |
4285 | * | |
4d2cb092 KW |
4286 | * options contains the changed options for the associated bs |
4287 | * (the BlockReopenQueue takes ownership) | |
4288 | * | |
e971aa12 JC |
4289 | * flags contains the open flags for the associated bs |
4290 | * | |
4291 | * returns a pointer to bs_queue, which is either the newly allocated | |
4292 | * bs_queue, or the existing bs_queue being used. | |
4293 | * | |
d22933ac | 4294 | * bs is drained here and undrained by bdrv_reopen_queue_free(). |
2e117866 KW |
4295 | * |
4296 | * To be called with bs->aio_context locked. | |
e971aa12 | 4297 | */ |
ce433d29 KW |
4298 | static BlockReopenQueue * GRAPH_RDLOCK |
4299 | bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, BlockDriverState *bs, | |
4300 | QDict *options, const BdrvChildClass *klass, | |
4301 | BdrvChildRole role, bool parent_is_format, | |
4302 | QDict *parent_options, int parent_flags, | |
4303 | bool keep_old_opts) | |
e971aa12 JC |
4304 | { |
4305 | assert(bs != NULL); | |
4306 | ||
4307 | BlockReopenQueueEntry *bs_entry; | |
67251a31 | 4308 | BdrvChild *child; |
9aa09ddd AG |
4309 | QDict *old_options, *explicit_options, *options_copy; |
4310 | int flags; | |
4311 | QemuOpts *opts; | |
67251a31 | 4312 | |
f0c28327 | 4313 | GLOBAL_STATE_CODE(); |
1a63a907 | 4314 | |
ce433d29 KW |
4315 | /* |
4316 | * Strictly speaking, draining is illegal under GRAPH_RDLOCK. We know that | |
4317 | * we've been called with bdrv_graph_rdlock_main_loop(), though, so it's ok | |
4318 | * in practice. | |
4319 | */ | |
d22933ac KW |
4320 | bdrv_drained_begin(bs); |
4321 | ||
e971aa12 JC |
4322 | if (bs_queue == NULL) { |
4323 | bs_queue = g_new0(BlockReopenQueue, 1); | |
859443b0 | 4324 | QTAILQ_INIT(bs_queue); |
e971aa12 JC |
4325 | } |
4326 | ||
4d2cb092 KW |
4327 | if (!options) { |
4328 | options = qdict_new(); | |
4329 | } | |
4330 | ||
5b7ba05f | 4331 | /* Check if this BlockDriverState is already in the queue */ |
859443b0 | 4332 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
5b7ba05f AG |
4333 | if (bs == bs_entry->state.bs) { |
4334 | break; | |
4335 | } | |
4336 | } | |
4337 | ||
28518102 KW |
4338 | /* |
4339 | * Precedence of options: | |
4340 | * 1. Explicitly passed in options (highest) | |
9aa09ddd AG |
4341 | * 2. Retained from explicitly set options of bs |
4342 | * 3. Inherited from parent node | |
4343 | * 4. Retained from effective options of bs | |
28518102 KW |
4344 | */ |
4345 | ||
145f598e | 4346 | /* Old explicitly set values (don't overwrite by inherited value) */ |
077e8e20 AG |
4347 | if (bs_entry || keep_old_opts) { |
4348 | old_options = qdict_clone_shallow(bs_entry ? | |
4349 | bs_entry->state.explicit_options : | |
4350 | bs->explicit_options); | |
4351 | bdrv_join_options(bs, options, old_options); | |
4352 | qobject_unref(old_options); | |
5b7ba05f | 4353 | } |
145f598e KW |
4354 | |
4355 | explicit_options = qdict_clone_shallow(options); | |
4356 | ||
28518102 KW |
4357 | /* Inherit from parent node */ |
4358 | if (parent_options) { | |
9aa09ddd | 4359 | flags = 0; |
3cdc69d3 | 4360 | klass->inherit_options(role, parent_is_format, &flags, options, |
272c02ea | 4361 | parent_flags, parent_options); |
9aa09ddd AG |
4362 | } else { |
4363 | flags = bdrv_get_flags(bs); | |
28518102 KW |
4364 | } |
4365 | ||
077e8e20 AG |
4366 | if (keep_old_opts) { |
4367 | /* Old values are used for options that aren't set yet */ | |
4368 | old_options = qdict_clone_shallow(bs->options); | |
4369 | bdrv_join_options(bs, options, old_options); | |
4370 | qobject_unref(old_options); | |
4371 | } | |
4d2cb092 | 4372 | |
9aa09ddd AG |
4373 | /* We have the final set of options so let's update the flags */ |
4374 | options_copy = qdict_clone_shallow(options); | |
4375 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); | |
4376 | qemu_opts_absorb_qdict(opts, options_copy, NULL); | |
4377 | update_flags_from_options(&flags, opts); | |
4378 | qemu_opts_del(opts); | |
4379 | qobject_unref(options_copy); | |
4380 | ||
fd452021 | 4381 | /* bdrv_open_inherit() sets and clears some additional flags internally */ |
f1f25a2e | 4382 | flags &= ~BDRV_O_PROTOCOL; |
fd452021 KW |
4383 | if (flags & BDRV_O_RDWR) { |
4384 | flags |= BDRV_O_ALLOW_RDWR; | |
4385 | } | |
f1f25a2e | 4386 | |
1857c97b KW |
4387 | if (!bs_entry) { |
4388 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
859443b0 | 4389 | QTAILQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
1857c97b | 4390 | } else { |
cb3e7f08 MAL |
4391 | qobject_unref(bs_entry->state.options); |
4392 | qobject_unref(bs_entry->state.explicit_options); | |
1857c97b KW |
4393 | } |
4394 | ||
4395 | bs_entry->state.bs = bs; | |
4396 | bs_entry->state.options = options; | |
4397 | bs_entry->state.explicit_options = explicit_options; | |
4398 | bs_entry->state.flags = flags; | |
4399 | ||
8546632e AG |
4400 | /* |
4401 | * If keep_old_opts is false then it means that unspecified | |
4402 | * options must be reset to their original value. We don't allow | |
4403 | * resetting 'backing' but we need to know if the option is | |
4404 | * missing in order to decide if we have to return an error. | |
4405 | */ | |
4406 | if (!keep_old_opts) { | |
4407 | bs_entry->state.backing_missing = | |
4408 | !qdict_haskey(options, "backing") && | |
4409 | !qdict_haskey(options, "backing.driver"); | |
4410 | } | |
4411 | ||
67251a31 | 4412 | QLIST_FOREACH(child, &bs->children, next) { |
8546632e AG |
4413 | QDict *new_child_options = NULL; |
4414 | bool child_keep_old = keep_old_opts; | |
67251a31 | 4415 | |
4c9dfe5d KW |
4416 | /* reopen can only change the options of block devices that were |
4417 | * implicitly created and inherited options. For other (referenced) | |
4418 | * block devices, a syntax like "backing.foo" results in an error. */ | |
67251a31 KW |
4419 | if (child->bs->inherits_from != bs) { |
4420 | continue; | |
4421 | } | |
4422 | ||
8546632e AG |
4423 | /* Check if the options contain a child reference */ |
4424 | if (qdict_haskey(options, child->name)) { | |
4425 | const char *childref = qdict_get_try_str(options, child->name); | |
4426 | /* | |
4427 | * The current child must not be reopened if the child | |
4428 | * reference is null or points to a different node. | |
4429 | */ | |
4430 | if (g_strcmp0(childref, child->bs->node_name)) { | |
4431 | continue; | |
4432 | } | |
4433 | /* | |
4434 | * If the child reference points to the current child then | |
4435 | * reopen it with its existing set of options (note that | |
4436 | * it can still inherit new options from the parent). | |
4437 | */ | |
4438 | child_keep_old = true; | |
4439 | } else { | |
4440 | /* Extract child options ("child-name.*") */ | |
4441 | char *child_key_dot = g_strdup_printf("%s.", child->name); | |
4442 | qdict_extract_subqdict(explicit_options, NULL, child_key_dot); | |
4443 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); | |
4444 | g_free(child_key_dot); | |
4445 | } | |
4c9dfe5d | 4446 | |
9aa09ddd | 4447 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, |
3cdc69d3 HR |
4448 | child->klass, child->role, bs->drv->is_format, |
4449 | options, flags, child_keep_old); | |
e971aa12 JC |
4450 | } |
4451 | ||
e971aa12 JC |
4452 | return bs_queue; |
4453 | } | |
4454 | ||
2e117866 | 4455 | /* To be called with bs->aio_context locked */ |
28518102 KW |
4456 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
4457 | BlockDriverState *bs, | |
077e8e20 | 4458 | QDict *options, bool keep_old_opts) |
28518102 | 4459 | { |
f791bf7f | 4460 | GLOBAL_STATE_CODE(); |
ce433d29 | 4461 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f791bf7f | 4462 | |
3cdc69d3 HR |
4463 | return bdrv_reopen_queue_child(bs_queue, bs, options, NULL, 0, false, |
4464 | NULL, 0, keep_old_opts); | |
28518102 KW |
4465 | } |
4466 | ||
ab5b5228 AG |
4467 | void bdrv_reopen_queue_free(BlockReopenQueue *bs_queue) |
4468 | { | |
f791bf7f | 4469 | GLOBAL_STATE_CODE(); |
ab5b5228 AG |
4470 | if (bs_queue) { |
4471 | BlockReopenQueueEntry *bs_entry, *next; | |
4472 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
d22933ac | 4473 | bdrv_drained_end(bs_entry->state.bs); |
ab5b5228 AG |
4474 | qobject_unref(bs_entry->state.explicit_options); |
4475 | qobject_unref(bs_entry->state.options); | |
4476 | g_free(bs_entry); | |
4477 | } | |
4478 | g_free(bs_queue); | |
4479 | } | |
4480 | } | |
4481 | ||
e971aa12 JC |
4482 | /* |
4483 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
4484 | * | |
4485 | * The queue passed in (bs_queue) must have been built up previous | |
4486 | * via bdrv_reopen_queue(). | |
4487 | * | |
4488 | * Reopens all BDS specified in the queue, with the appropriate | |
4489 | * flags. All devices are prepared for reopen, and failure of any | |
50d6a8a3 | 4490 | * device will cause all device changes to be abandoned, and intermediate |
e971aa12 JC |
4491 | * data cleaned up. |
4492 | * | |
4493 | * If all devices prepare successfully, then the changes are committed | |
4494 | * to all devices. | |
4495 | * | |
1a63a907 KW |
4496 | * All affected nodes must be drained between bdrv_reopen_queue() and |
4497 | * bdrv_reopen_multiple(). | |
6cf42ca2 KW |
4498 | * |
4499 | * To be called from the main thread, with all other AioContexts unlocked. | |
e971aa12 | 4500 | */ |
5019aece | 4501 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
e971aa12 JC |
4502 | { |
4503 | int ret = -1; | |
4504 | BlockReopenQueueEntry *bs_entry, *next; | |
72373e40 | 4505 | Transaction *tran = tran_new(); |
72373e40 | 4506 | g_autoptr(GSList) refresh_list = NULL; |
e971aa12 | 4507 | |
6cf42ca2 | 4508 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
e971aa12 | 4509 | assert(bs_queue != NULL); |
da359909 | 4510 | GLOBAL_STATE_CODE(); |
e971aa12 | 4511 | |
a2aabf88 VSO |
4512 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
4513 | ret = bdrv_flush(bs_entry->state.bs); | |
4514 | if (ret < 0) { | |
4515 | error_setg_errno(errp, -ret, "Error flushing drive"); | |
e3fc91aa | 4516 | goto abort; |
a2aabf88 VSO |
4517 | } |
4518 | } | |
4519 | ||
859443b0 | 4520 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
1a63a907 | 4521 | assert(bs_entry->state.bs->quiesce_counter > 0); |
72373e40 VSO |
4522 | ret = bdrv_reopen_prepare(&bs_entry->state, bs_queue, tran, errp); |
4523 | if (ret < 0) { | |
4524 | goto abort; | |
e971aa12 JC |
4525 | } |
4526 | bs_entry->prepared = true; | |
4527 | } | |
4528 | ||
859443b0 | 4529 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
69b736e7 | 4530 | BDRVReopenState *state = &bs_entry->state; |
72373e40 | 4531 | |
fb0ff4d1 | 4532 | refresh_list = g_slist_prepend(refresh_list, state->bs); |
72373e40 | 4533 | if (state->old_backing_bs) { |
fb0ff4d1 | 4534 | refresh_list = g_slist_prepend(refresh_list, state->old_backing_bs); |
cb828c31 | 4535 | } |
ecd30d2d | 4536 | if (state->old_file_bs) { |
fb0ff4d1 | 4537 | refresh_list = g_slist_prepend(refresh_list, state->old_file_bs); |
ecd30d2d | 4538 | } |
72373e40 VSO |
4539 | } |
4540 | ||
4541 | /* | |
4542 | * Note that file-posix driver rely on permission update done during reopen | |
4543 | * (even if no permission changed), because it wants "new" permissions for | |
4544 | * reconfiguring the fd and that's why it does it in raw_check_perm(), not | |
4545 | * in raw_reopen_prepare() which is called with "old" permissions. | |
4546 | */ | |
3804e3cf | 4547 | bdrv_graph_rdlock_main_loop(); |
72373e40 | 4548 | ret = bdrv_list_refresh_perms(refresh_list, bs_queue, tran, errp); |
3804e3cf KW |
4549 | bdrv_graph_rdunlock_main_loop(); |
4550 | ||
72373e40 VSO |
4551 | if (ret < 0) { |
4552 | goto abort; | |
69b736e7 KW |
4553 | } |
4554 | ||
fcd6a4f4 VSO |
4555 | /* |
4556 | * If we reach this point, we have success and just need to apply the | |
4557 | * changes. | |
4558 | * | |
4559 | * Reverse order is used to comfort qcow2 driver: on commit it need to write | |
4560 | * IN_USE flag to the image, to mark bitmaps in the image as invalid. But | |
4561 | * children are usually goes after parents in reopen-queue, so go from last | |
4562 | * to first element. | |
e971aa12 | 4563 | */ |
fcd6a4f4 | 4564 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
e971aa12 JC |
4565 | bdrv_reopen_commit(&bs_entry->state); |
4566 | } | |
4567 | ||
6bc30f19 | 4568 | bdrv_graph_wrlock(); |
72373e40 | 4569 | tran_commit(tran); |
6bc30f19 | 4570 | bdrv_graph_wrunlock(); |
69b736e7 | 4571 | |
72373e40 VSO |
4572 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
4573 | BlockDriverState *bs = bs_entry->state.bs; | |
74ad9a3b | 4574 | |
72373e40 VSO |
4575 | if (bs->drv->bdrv_reopen_commit_post) { |
4576 | bs->drv->bdrv_reopen_commit_post(&bs_entry->state); | |
69b736e7 KW |
4577 | } |
4578 | } | |
17e1e2be | 4579 | |
72373e40 VSO |
4580 | ret = 0; |
4581 | goto cleanup; | |
17e1e2be | 4582 | |
72373e40 | 4583 | abort: |
6bc30f19 | 4584 | bdrv_graph_wrlock(); |
72373e40 | 4585 | tran_abort(tran); |
6bc30f19 | 4586 | bdrv_graph_wrunlock(); |
7d4ca9d2 | 4587 | |
72373e40 VSO |
4588 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
4589 | if (bs_entry->prepared) { | |
4590 | bdrv_reopen_abort(&bs_entry->state); | |
17e1e2be PK |
4591 | } |
4592 | } | |
72373e40 | 4593 | |
e971aa12 | 4594 | cleanup: |
ab5b5228 | 4595 | bdrv_reopen_queue_free(bs_queue); |
40840e41 | 4596 | |
e971aa12 JC |
4597 | return ret; |
4598 | } | |
4599 | ||
6cf42ca2 KW |
4600 | int bdrv_reopen(BlockDriverState *bs, QDict *opts, bool keep_old_opts, |
4601 | Error **errp) | |
6e1000a8 | 4602 | { |
6e1000a8 | 4603 | BlockReopenQueue *queue; |
6e1000a8 | 4604 | |
f791bf7f EGE |
4605 | GLOBAL_STATE_CODE(); |
4606 | ||
2e117866 KW |
4607 | queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts); |
4608 | ||
b49f4755 | 4609 | return bdrv_reopen_multiple(queue, errp); |
6e1000a8 AG |
4610 | } |
4611 | ||
6cf42ca2 KW |
4612 | int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
4613 | Error **errp) | |
4614 | { | |
4615 | QDict *opts = qdict_new(); | |
4616 | ||
f791bf7f EGE |
4617 | GLOBAL_STATE_CODE(); |
4618 | ||
6cf42ca2 KW |
4619 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, read_only); |
4620 | ||
4621 | return bdrv_reopen(bs, opts, true, errp); | |
4622 | } | |
4623 | ||
cb828c31 AG |
4624 | /* |
4625 | * Take a BDRVReopenState and check if the value of 'backing' in the | |
4626 | * reopen_state->options QDict is valid or not. | |
4627 | * | |
4628 | * If 'backing' is missing from the QDict then return 0. | |
4629 | * | |
4630 | * If 'backing' contains the node name of the backing file of | |
4631 | * reopen_state->bs then return 0. | |
4632 | * | |
4633 | * If 'backing' contains a different node name (or is null) then check | |
4634 | * whether the current backing file can be replaced with the new one. | |
4635 | * If that's the case then reopen_state->replace_backing_bs is set to | |
4636 | * true and reopen_state->new_backing_bs contains a pointer to the new | |
4637 | * backing BlockDriverState (or NULL). | |
4638 | * | |
5661a00d KW |
4639 | * After calling this function, the transaction @tran may only be completed |
4640 | * while holding a writer lock for the graph. | |
4641 | * | |
cb828c31 | 4642 | * Return 0 on success, otherwise return < 0 and set @errp. |
4b408668 | 4643 | * |
4b408668 | 4644 | * @reopen_state->bs can move to a different AioContext in this function. |
cb828c31 | 4645 | */ |
ce433d29 KW |
4646 | static int GRAPH_UNLOCKED |
4647 | bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state, | |
4648 | bool is_backing, Transaction *tran, | |
4649 | Error **errp) | |
cb828c31 AG |
4650 | { |
4651 | BlockDriverState *bs = reopen_state->bs; | |
ecd30d2d | 4652 | BlockDriverState *new_child_bs; |
004915a9 KW |
4653 | BlockDriverState *old_child_bs; |
4654 | ||
ecd30d2d | 4655 | const char *child_name = is_backing ? "backing" : "file"; |
cb828c31 AG |
4656 | QObject *value; |
4657 | const char *str; | |
ce433d29 | 4658 | bool has_child; |
4b408668 | 4659 | int ret; |
cb828c31 | 4660 | |
bdb73476 EGE |
4661 | GLOBAL_STATE_CODE(); |
4662 | ||
ecd30d2d | 4663 | value = qdict_get(reopen_state->options, child_name); |
cb828c31 AG |
4664 | if (value == NULL) { |
4665 | return 0; | |
4666 | } | |
4667 | ||
430da832 KW |
4668 | bdrv_graph_rdlock_main_loop(); |
4669 | ||
cb828c31 AG |
4670 | switch (qobject_type(value)) { |
4671 | case QTYPE_QNULL: | |
ecd30d2d AG |
4672 | assert(is_backing); /* The 'file' option does not allow a null value */ |
4673 | new_child_bs = NULL; | |
cb828c31 AG |
4674 | break; |
4675 | case QTYPE_QSTRING: | |
410f44f5 | 4676 | str = qstring_get_str(qobject_to(QString, value)); |
ecd30d2d AG |
4677 | new_child_bs = bdrv_lookup_bs(NULL, str, errp); |
4678 | if (new_child_bs == NULL) { | |
430da832 KW |
4679 | ret = -EINVAL; |
4680 | goto out_rdlock; | |
ce433d29 KW |
4681 | } |
4682 | ||
ce433d29 | 4683 | has_child = bdrv_recurse_has_child(new_child_bs, bs); |
ce433d29 | 4684 | if (has_child) { |
ecd30d2d AG |
4685 | error_setg(errp, "Making '%s' a %s child of '%s' would create a " |
4686 | "cycle", str, child_name, bs->node_name); | |
430da832 KW |
4687 | ret = -EINVAL; |
4688 | goto out_rdlock; | |
cb828c31 AG |
4689 | } |
4690 | break; | |
4691 | default: | |
ecd30d2d AG |
4692 | /* |
4693 | * The options QDict has been flattened, so 'backing' and 'file' | |
4694 | * do not allow any other data type here. | |
4695 | */ | |
cb828c31 AG |
4696 | g_assert_not_reached(); |
4697 | } | |
4698 | ||
004915a9 | 4699 | old_child_bs = is_backing ? child_bs(bs->backing) : child_bs(bs->file); |
ecd30d2d | 4700 | if (old_child_bs == new_child_bs) { |
430da832 KW |
4701 | ret = 0; |
4702 | goto out_rdlock; | |
ecd30d2d AG |
4703 | } |
4704 | ||
4705 | if (old_child_bs) { | |
4706 | if (bdrv_skip_implicit_filters(old_child_bs) == new_child_bs) { | |
430da832 KW |
4707 | ret = 0; |
4708 | goto out_rdlock; | |
cbfdb98c VSO |
4709 | } |
4710 | ||
ecd30d2d AG |
4711 | if (old_child_bs->implicit) { |
4712 | error_setg(errp, "Cannot replace implicit %s child of %s", | |
4713 | child_name, bs->node_name); | |
430da832 KW |
4714 | ret = -EPERM; |
4715 | goto out_rdlock; | |
cbfdb98c VSO |
4716 | } |
4717 | } | |
4718 | ||
ecd30d2d | 4719 | if (bs->drv->is_filter && !old_child_bs) { |
25f78d9e VSO |
4720 | /* |
4721 | * Filters always have a file or a backing child, so we are trying to | |
4722 | * change wrong child | |
4723 | */ | |
4724 | error_setg(errp, "'%s' is a %s filter node that does not support a " | |
ecd30d2d | 4725 | "%s child", bs->node_name, bs->drv->format_name, child_name); |
430da832 KW |
4726 | ret = -EINVAL; |
4727 | goto out_rdlock; | |
1d42f48c HR |
4728 | } |
4729 | ||
ecd30d2d AG |
4730 | if (is_backing) { |
4731 | reopen_state->old_backing_bs = old_child_bs; | |
4732 | } else { | |
4733 | reopen_state->old_file_bs = old_child_bs; | |
4734 | } | |
4735 | ||
7d4ca9d2 KW |
4736 | if (old_child_bs) { |
4737 | bdrv_ref(old_child_bs); | |
4738 | bdrv_drained_begin(old_child_bs); | |
4739 | } | |
4740 | ||
430da832 | 4741 | bdrv_graph_rdunlock_main_loop(); |
6bc30f19 | 4742 | bdrv_graph_wrlock(); |
7d4ca9d2 | 4743 | |
4b408668 KW |
4744 | ret = bdrv_set_file_or_backing_noperm(bs, new_child_bs, is_backing, |
4745 | tran, errp); | |
4746 | ||
6bc30f19 | 4747 | bdrv_graph_wrunlock(); |
7d4ca9d2 | 4748 | |
7d4ca9d2 KW |
4749 | if (old_child_bs) { |
4750 | bdrv_drained_end(old_child_bs); | |
4751 | bdrv_unref(old_child_bs); | |
4752 | } | |
4753 | ||
4b408668 | 4754 | return ret; |
430da832 KW |
4755 | |
4756 | out_rdlock: | |
4757 | bdrv_graph_rdunlock_main_loop(); | |
4758 | return ret; | |
cb828c31 AG |
4759 | } |
4760 | ||
e971aa12 JC |
4761 | /* |
4762 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
4763 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
4764 | * the block driver layer .bdrv_reopen_prepare() | |
4765 | * | |
4766 | * bs is the BlockDriverState to reopen | |
4767 | * flags are the new open flags | |
4768 | * queue is the reopen queue | |
4769 | * | |
4770 | * Returns 0 on success, non-zero on error. On error errp will be set | |
4771 | * as well. | |
4772 | * | |
4773 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
4774 | * It is the responsibility of the caller to then call the abort() or | |
4775 | * commit() for any other BDS that have been left in a prepare() state | |
4776 | * | |
5661a00d KW |
4777 | * After calling this function, the transaction @change_child_tran may only be |
4778 | * completed while holding a writer lock for the graph. | |
e971aa12 | 4779 | */ |
ce433d29 KW |
4780 | static int GRAPH_UNLOCKED |
4781 | bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
4782 | Transaction *change_child_tran, Error **errp) | |
e971aa12 JC |
4783 | { |
4784 | int ret = -1; | |
e6d79c41 | 4785 | int old_flags; |
e971aa12 JC |
4786 | Error *local_err = NULL; |
4787 | BlockDriver *drv; | |
ccf9dc07 | 4788 | QemuOpts *opts; |
4c8350fe | 4789 | QDict *orig_reopen_opts; |
593b3071 | 4790 | char *discard = NULL; |
3d8ce171 | 4791 | bool read_only; |
9ad08c44 | 4792 | bool drv_prepared = false; |
e971aa12 JC |
4793 | |
4794 | assert(reopen_state != NULL); | |
4795 | assert(reopen_state->bs->drv != NULL); | |
da359909 | 4796 | GLOBAL_STATE_CODE(); |
e971aa12 JC |
4797 | drv = reopen_state->bs->drv; |
4798 | ||
4c8350fe AG |
4799 | /* This function and each driver's bdrv_reopen_prepare() remove |
4800 | * entries from reopen_state->options as they are processed, so | |
4801 | * we need to make a copy of the original QDict. */ | |
4802 | orig_reopen_opts = qdict_clone_shallow(reopen_state->options); | |
4803 | ||
ccf9dc07 KW |
4804 | /* Process generic block layer options */ |
4805 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); | |
af175e85 | 4806 | if (!qemu_opts_absorb_qdict(opts, reopen_state->options, errp)) { |
ccf9dc07 KW |
4807 | ret = -EINVAL; |
4808 | goto error; | |
4809 | } | |
4810 | ||
e6d79c41 AG |
4811 | /* This was already called in bdrv_reopen_queue_child() so the flags |
4812 | * are up-to-date. This time we simply want to remove the options from | |
4813 | * QemuOpts in order to indicate that they have been processed. */ | |
4814 | old_flags = reopen_state->flags; | |
91a097e7 | 4815 | update_flags_from_options(&reopen_state->flags, opts); |
e6d79c41 | 4816 | assert(old_flags == reopen_state->flags); |
91a097e7 | 4817 | |
415bbca8 | 4818 | discard = qemu_opt_get_del(opts, BDRV_OPT_DISCARD); |
593b3071 AG |
4819 | if (discard != NULL) { |
4820 | if (bdrv_parse_discard_flags(discard, &reopen_state->flags) != 0) { | |
4821 | error_setg(errp, "Invalid discard option"); | |
4822 | ret = -EINVAL; | |
4823 | goto error; | |
4824 | } | |
4825 | } | |
4826 | ||
543770bd AG |
4827 | reopen_state->detect_zeroes = |
4828 | bdrv_parse_detect_zeroes(opts, reopen_state->flags, &local_err); | |
4829 | if (local_err) { | |
4830 | error_propagate(errp, local_err); | |
4831 | ret = -EINVAL; | |
4832 | goto error; | |
4833 | } | |
4834 | ||
57f9db9a AG |
4835 | /* All other options (including node-name and driver) must be unchanged. |
4836 | * Put them back into the QDict, so that they are checked at the end | |
4837 | * of this function. */ | |
4838 | qemu_opts_to_qdict(opts, reopen_state->options); | |
ccf9dc07 | 4839 | |
3d8ce171 JC |
4840 | /* If we are to stay read-only, do not allow permission change |
4841 | * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is | |
4842 | * not set, or if the BDS still has copy_on_read enabled */ | |
4843 | read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
4026f1c4 KW |
4844 | |
4845 | bdrv_graph_rdlock_main_loop(); | |
54a32bfe | 4846 | ret = bdrv_can_set_read_only(reopen_state->bs, read_only, true, &local_err); |
4026f1c4 | 4847 | bdrv_graph_rdunlock_main_loop(); |
3d8ce171 JC |
4848 | if (local_err) { |
4849 | error_propagate(errp, local_err); | |
e971aa12 JC |
4850 | goto error; |
4851 | } | |
4852 | ||
e971aa12 | 4853 | if (drv->bdrv_reopen_prepare) { |
faf116b4 AG |
4854 | /* |
4855 | * If a driver-specific option is missing, it means that we | |
4856 | * should reset it to its default value. | |
4857 | * But not all options allow that, so we need to check it first. | |
4858 | */ | |
4859 | ret = bdrv_reset_options_allowed(reopen_state->bs, | |
4860 | reopen_state->options, errp); | |
4861 | if (ret) { | |
4862 | goto error; | |
4863 | } | |
4864 | ||
e971aa12 JC |
4865 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
4866 | if (ret) { | |
4867 | if (local_err != NULL) { | |
4868 | error_propagate(errp, local_err); | |
4869 | } else { | |
b7cfc7d5 | 4870 | bdrv_graph_rdlock_main_loop(); |
f30c66ba | 4871 | bdrv_refresh_filename(reopen_state->bs); |
b7cfc7d5 | 4872 | bdrv_graph_rdunlock_main_loop(); |
d8b6895f LC |
4873 | error_setg(errp, "failed while preparing to reopen image '%s'", |
4874 | reopen_state->bs->filename); | |
e971aa12 JC |
4875 | } |
4876 | goto error; | |
4877 | } | |
4878 | } else { | |
4879 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
4880 | * handler for each supported drv. */ | |
4026f1c4 | 4881 | bdrv_graph_rdlock_main_loop(); |
81e5f78a AG |
4882 | error_setg(errp, "Block format '%s' used by node '%s' " |
4883 | "does not support reopening files", drv->format_name, | |
4884 | bdrv_get_device_or_node_name(reopen_state->bs)); | |
4026f1c4 | 4885 | bdrv_graph_rdunlock_main_loop(); |
e971aa12 JC |
4886 | ret = -1; |
4887 | goto error; | |
4888 | } | |
4889 | ||
9ad08c44 HR |
4890 | drv_prepared = true; |
4891 | ||
bacd9b87 AG |
4892 | /* |
4893 | * We must provide the 'backing' option if the BDS has a backing | |
4894 | * file or if the image file has a backing file name as part of | |
4895 | * its metadata. Otherwise the 'backing' option can be omitted. | |
4896 | */ | |
004915a9 | 4897 | bdrv_graph_rdlock_main_loop(); |
bacd9b87 | 4898 | if (drv->supports_backing && reopen_state->backing_missing && |
1d42f48c | 4899 | (reopen_state->bs->backing || reopen_state->bs->backing_file[0])) { |
8546632e AG |
4900 | error_setg(errp, "backing is missing for '%s'", |
4901 | reopen_state->bs->node_name); | |
004915a9 | 4902 | bdrv_graph_rdunlock_main_loop(); |
8546632e AG |
4903 | ret = -EINVAL; |
4904 | goto error; | |
4905 | } | |
004915a9 | 4906 | bdrv_graph_rdunlock_main_loop(); |
8546632e | 4907 | |
cb828c31 AG |
4908 | /* |
4909 | * Allow changing the 'backing' option. The new value can be | |
4910 | * either a reference to an existing node (using its node name) | |
4911 | * or NULL to simply detach the current backing file. | |
4912 | */ | |
ecd30d2d AG |
4913 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, true, |
4914 | change_child_tran, errp); | |
cb828c31 AG |
4915 | if (ret < 0) { |
4916 | goto error; | |
4917 | } | |
4918 | qdict_del(reopen_state->options, "backing"); | |
4919 | ||
ecd30d2d AG |
4920 | /* Allow changing the 'file' option. In this case NULL is not allowed */ |
4921 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, false, | |
4922 | change_child_tran, errp); | |
4923 | if (ret < 0) { | |
4924 | goto error; | |
4925 | } | |
4926 | qdict_del(reopen_state->options, "file"); | |
4927 | ||
4d2cb092 KW |
4928 | /* Options that are not handled are only okay if they are unchanged |
4929 | * compared to the old state. It is expected that some options are only | |
4930 | * used for the initial open, but not reopen (e.g. filename) */ | |
4931 | if (qdict_size(reopen_state->options)) { | |
4932 | const QDictEntry *entry = qdict_first(reopen_state->options); | |
4933 | ||
ce433d29 KW |
4934 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
4935 | ||
4d2cb092 | 4936 | do { |
54fd1b0d HR |
4937 | QObject *new = entry->value; |
4938 | QObject *old = qdict_get(reopen_state->bs->options, entry->key); | |
4939 | ||
db905283 AG |
4940 | /* Allow child references (child_name=node_name) as long as they |
4941 | * point to the current child (i.e. everything stays the same). */ | |
4942 | if (qobject_type(new) == QTYPE_QSTRING) { | |
4943 | BdrvChild *child; | |
4944 | QLIST_FOREACH(child, &reopen_state->bs->children, next) { | |
4945 | if (!strcmp(child->name, entry->key)) { | |
4946 | break; | |
4947 | } | |
4948 | } | |
4949 | ||
4950 | if (child) { | |
410f44f5 MA |
4951 | if (!strcmp(child->bs->node_name, |
4952 | qstring_get_str(qobject_to(QString, new)))) { | |
db905283 AG |
4953 | continue; /* Found child with this name, skip option */ |
4954 | } | |
4955 | } | |
4956 | } | |
4957 | ||
129c7d1c | 4958 | /* |
54fd1b0d HR |
4959 | * TODO: When using -drive to specify blockdev options, all values |
4960 | * will be strings; however, when using -blockdev, blockdev-add or | |
4961 | * filenames using the json:{} pseudo-protocol, they will be | |
4962 | * correctly typed. | |
4963 | * In contrast, reopening options are (currently) always strings | |
4964 | * (because you can only specify them through qemu-io; all other | |
4965 | * callers do not specify any options). | |
4966 | * Therefore, when using anything other than -drive to create a BDS, | |
4967 | * this cannot detect non-string options as unchanged, because | |
4968 | * qobject_is_equal() always returns false for objects of different | |
4969 | * type. In the future, this should be remedied by correctly typing | |
4970 | * all options. For now, this is not too big of an issue because | |
4971 | * the user can simply omit options which cannot be changed anyway, | |
4972 | * so they will stay unchanged. | |
129c7d1c | 4973 | */ |
54fd1b0d | 4974 | if (!qobject_is_equal(new, old)) { |
4d2cb092 KW |
4975 | error_setg(errp, "Cannot change the option '%s'", entry->key); |
4976 | ret = -EINVAL; | |
4977 | goto error; | |
4978 | } | |
4979 | } while ((entry = qdict_next(reopen_state->options, entry))); | |
4980 | } | |
4981 | ||
e971aa12 JC |
4982 | ret = 0; |
4983 | ||
4c8350fe AG |
4984 | /* Restore the original reopen_state->options QDict */ |
4985 | qobject_unref(reopen_state->options); | |
4986 | reopen_state->options = qobject_ref(orig_reopen_opts); | |
4987 | ||
e971aa12 | 4988 | error: |
9ad08c44 HR |
4989 | if (ret < 0 && drv_prepared) { |
4990 | /* drv->bdrv_reopen_prepare() has succeeded, so we need to | |
4991 | * call drv->bdrv_reopen_abort() before signaling an error | |
4992 | * (bdrv_reopen_multiple() will not call bdrv_reopen_abort() | |
4993 | * when the respective bdrv_reopen_prepare() has failed) */ | |
4994 | if (drv->bdrv_reopen_abort) { | |
4995 | drv->bdrv_reopen_abort(reopen_state); | |
4996 | } | |
4997 | } | |
ccf9dc07 | 4998 | qemu_opts_del(opts); |
4c8350fe | 4999 | qobject_unref(orig_reopen_opts); |
593b3071 | 5000 | g_free(discard); |
e971aa12 JC |
5001 | return ret; |
5002 | } | |
5003 | ||
5004 | /* | |
5005 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
5006 | * makes them final by swapping the staging BlockDriverState contents into | |
5007 | * the active BlockDriverState contents. | |
5008 | */ | |
ce433d29 | 5009 | static void GRAPH_UNLOCKED bdrv_reopen_commit(BDRVReopenState *reopen_state) |
e971aa12 JC |
5010 | { |
5011 | BlockDriver *drv; | |
50bf65ba | 5012 | BlockDriverState *bs; |
50196d7a | 5013 | BdrvChild *child; |
e971aa12 JC |
5014 | |
5015 | assert(reopen_state != NULL); | |
50bf65ba VSO |
5016 | bs = reopen_state->bs; |
5017 | drv = bs->drv; | |
e971aa12 | 5018 | assert(drv != NULL); |
da359909 | 5019 | GLOBAL_STATE_CODE(); |
e971aa12 JC |
5020 | |
5021 | /* If there are any driver level actions to take */ | |
5022 | if (drv->bdrv_reopen_commit) { | |
5023 | drv->bdrv_reopen_commit(reopen_state); | |
5024 | } | |
5025 | ||
ce433d29 KW |
5026 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
5027 | ||
e971aa12 | 5028 | /* set BDS specific flags now */ |
cb3e7f08 | 5029 | qobject_unref(bs->explicit_options); |
4c8350fe | 5030 | qobject_unref(bs->options); |
ab5b5228 AG |
5031 | qobject_ref(reopen_state->explicit_options); |
5032 | qobject_ref(reopen_state->options); | |
145f598e | 5033 | |
50bf65ba | 5034 | bs->explicit_options = reopen_state->explicit_options; |
4c8350fe | 5035 | bs->options = reopen_state->options; |
50bf65ba | 5036 | bs->open_flags = reopen_state->flags; |
543770bd | 5037 | bs->detect_zeroes = reopen_state->detect_zeroes; |
355ef4ac | 5038 | |
50196d7a AG |
5039 | /* Remove child references from bs->options and bs->explicit_options. |
5040 | * Child options were already removed in bdrv_reopen_queue_child() */ | |
5041 | QLIST_FOREACH(child, &bs->children, next) { | |
5042 | qdict_del(bs->explicit_options, child->name); | |
5043 | qdict_del(bs->options, child->name); | |
5044 | } | |
3d0e8743 VSO |
5045 | /* backing is probably removed, so it's not handled by previous loop */ |
5046 | qdict_del(bs->explicit_options, "backing"); | |
5047 | qdict_del(bs->options, "backing"); | |
5048 | ||
1e4c797c | 5049 | bdrv_refresh_limits(bs, NULL, NULL); |
439cc330 | 5050 | bdrv_refresh_total_sectors(bs, bs->total_sectors); |
e971aa12 JC |
5051 | } |
5052 | ||
5053 | /* | |
5054 | * Abort the reopen, and delete and free the staged changes in | |
5055 | * reopen_state | |
5056 | */ | |
ce433d29 | 5057 | static void GRAPH_UNLOCKED bdrv_reopen_abort(BDRVReopenState *reopen_state) |
e971aa12 JC |
5058 | { |
5059 | BlockDriver *drv; | |
5060 | ||
5061 | assert(reopen_state != NULL); | |
5062 | drv = reopen_state->bs->drv; | |
5063 | assert(drv != NULL); | |
da359909 | 5064 | GLOBAL_STATE_CODE(); |
e971aa12 JC |
5065 | |
5066 | if (drv->bdrv_reopen_abort) { | |
5067 | drv->bdrv_reopen_abort(reopen_state); | |
5068 | } | |
5069 | } | |
5070 | ||
5071 | ||
64dff520 | 5072 | static void bdrv_close(BlockDriverState *bs) |
fc01f7e7 | 5073 | { |
33384421 | 5074 | BdrvAioNotifier *ban, *ban_next; |
50a3efb0 | 5075 | BdrvChild *child, *next; |
33384421 | 5076 | |
f791bf7f | 5077 | GLOBAL_STATE_CODE(); |
30f55fb8 | 5078 | assert(!bs->refcnt); |
99b7e775 | 5079 | |
fc27291d | 5080 | bdrv_drained_begin(bs); /* complete I/O */ |
58fda173 | 5081 | bdrv_flush(bs); |
53ec73e2 | 5082 | bdrv_drain(bs); /* in case flush left pending I/O */ |
fc27291d | 5083 | |
3cbc002c | 5084 | if (bs->drv) { |
3c005293 | 5085 | if (bs->drv->bdrv_close) { |
7b99a266 | 5086 | /* Must unfreeze all children, so bdrv_unref_child() works */ |
3c005293 VSO |
5087 | bs->drv->bdrv_close(bs); |
5088 | } | |
9a4f4c31 | 5089 | bs->drv = NULL; |
50a3efb0 | 5090 | } |
9a7dedbc | 5091 | |
6bc30f19 | 5092 | bdrv_graph_wrlock(); |
50a3efb0 | 5093 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
dd4118c7 | 5094 | bdrv_unref_child(bs, child); |
b338082b | 5095 | } |
98f90dba | 5096 | |
5bb04747 VSO |
5097 | assert(!bs->backing); |
5098 | assert(!bs->file); | |
6bc30f19 | 5099 | bdrv_graph_wrunlock(); |
004915a9 | 5100 | |
50a3efb0 AG |
5101 | g_free(bs->opaque); |
5102 | bs->opaque = NULL; | |
d73415a3 | 5103 | qatomic_set(&bs->copy_on_read, 0); |
50a3efb0 AG |
5104 | bs->backing_file[0] = '\0'; |
5105 | bs->backing_format[0] = '\0'; | |
5106 | bs->total_sectors = 0; | |
5107 | bs->encrypted = false; | |
5108 | bs->sg = false; | |
cb3e7f08 MAL |
5109 | qobject_unref(bs->options); |
5110 | qobject_unref(bs->explicit_options); | |
50a3efb0 AG |
5111 | bs->options = NULL; |
5112 | bs->explicit_options = NULL; | |
cb3e7f08 | 5113 | qobject_unref(bs->full_open_options); |
50a3efb0 | 5114 | bs->full_open_options = NULL; |
0bc329fb HR |
5115 | g_free(bs->block_status_cache); |
5116 | bs->block_status_cache = NULL; | |
50a3efb0 | 5117 | |
cca43ae1 VSO |
5118 | bdrv_release_named_dirty_bitmaps(bs); |
5119 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); | |
5120 | ||
33384421 HR |
5121 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
5122 | g_free(ban); | |
5123 | } | |
5124 | QLIST_INIT(&bs->aio_notifiers); | |
fc27291d | 5125 | bdrv_drained_end(bs); |
1a6d3bd2 GK |
5126 | |
5127 | /* | |
5128 | * If we're still inside some bdrv_drain_all_begin()/end() sections, end | |
5129 | * them now since this BDS won't exist anymore when bdrv_drain_all_end() | |
5130 | * gets called. | |
5131 | */ | |
5132 | if (bs->quiesce_counter) { | |
5133 | bdrv_drain_all_end_quiesce(bs); | |
5134 | } | |
b338082b FB |
5135 | } |
5136 | ||
2bc93fed MK |
5137 | void bdrv_close_all(void) |
5138 | { | |
f791bf7f | 5139 | GLOBAL_STATE_CODE(); |
880eeec6 | 5140 | assert(job_next(NULL) == NULL); |
ca9bd24c HR |
5141 | |
5142 | /* Drop references from requests still in flight, such as canceled block | |
5143 | * jobs whose AIO context has not been polled yet */ | |
5144 | bdrv_drain_all(); | |
2bc93fed | 5145 | |
ca9bd24c HR |
5146 | blk_remove_all_bs(); |
5147 | blockdev_close_all_bdrv_states(); | |
ed78cda3 | 5148 | |
a1a2af07 | 5149 | assert(QTAILQ_EMPTY(&all_bdrv_states)); |
2bc93fed MK |
5150 | } |
5151 | ||
2f64e1fc | 5152 | static bool GRAPH_RDLOCK should_update_child(BdrvChild *c, BlockDriverState *to) |
d0ac0380 | 5153 | { |
2f30b7c3 VSO |
5154 | GQueue *queue; |
5155 | GHashTable *found; | |
5156 | bool ret; | |
d0ac0380 | 5157 | |
bd86fb99 | 5158 | if (c->klass->stay_at_node) { |
d0ac0380 KW |
5159 | return false; |
5160 | } | |
5161 | ||
ec9f10fe HR |
5162 | /* If the child @c belongs to the BDS @to, replacing the current |
5163 | * c->bs by @to would mean to create a loop. | |
5164 | * | |
5165 | * Such a case occurs when appending a BDS to a backing chain. | |
5166 | * For instance, imagine the following chain: | |
5167 | * | |
5168 | * guest device -> node A -> further backing chain... | |
5169 | * | |
5170 | * Now we create a new BDS B which we want to put on top of this | |
5171 | * chain, so we first attach A as its backing node: | |
5172 | * | |
5173 | * node B | |
5174 | * | | |
5175 | * v | |
5176 | * guest device -> node A -> further backing chain... | |
5177 | * | |
5178 | * Finally we want to replace A by B. When doing that, we want to | |
5179 | * replace all pointers to A by pointers to B -- except for the | |
5180 | * pointer from B because (1) that would create a loop, and (2) | |
5181 | * that pointer should simply stay intact: | |
5182 | * | |
5183 | * guest device -> node B | |
5184 | * | | |
5185 | * v | |
5186 | * node A -> further backing chain... | |
5187 | * | |
5188 | * In general, when replacing a node A (c->bs) by a node B (@to), | |
5189 | * if A is a child of B, that means we cannot replace A by B there | |
5190 | * because that would create a loop. Silently detaching A from B | |
5191 | * is also not really an option. So overall just leaving A in | |
2f30b7c3 VSO |
5192 | * place there is the most sensible choice. |
5193 | * | |
5194 | * We would also create a loop in any cases where @c is only | |
5195 | * indirectly referenced by @to. Prevent this by returning false | |
5196 | * if @c is found (by breadth-first search) anywhere in the whole | |
5197 | * subtree of @to. | |
5198 | */ | |
5199 | ||
5200 | ret = true; | |
5201 | found = g_hash_table_new(NULL, NULL); | |
5202 | g_hash_table_add(found, to); | |
5203 | queue = g_queue_new(); | |
5204 | g_queue_push_tail(queue, to); | |
5205 | ||
5206 | while (!g_queue_is_empty(queue)) { | |
5207 | BlockDriverState *v = g_queue_pop_head(queue); | |
5208 | BdrvChild *c2; | |
5209 | ||
5210 | QLIST_FOREACH(c2, &v->children, next) { | |
5211 | if (c2 == c) { | |
5212 | ret = false; | |
5213 | break; | |
5214 | } | |
5215 | ||
5216 | if (g_hash_table_contains(found, c2->bs)) { | |
5217 | continue; | |
5218 | } | |
5219 | ||
5220 | g_queue_push_tail(queue, c2->bs); | |
5221 | g_hash_table_add(found, c2->bs); | |
d0ac0380 KW |
5222 | } |
5223 | } | |
5224 | ||
2f30b7c3 VSO |
5225 | g_queue_free(queue); |
5226 | g_hash_table_destroy(found); | |
5227 | ||
5228 | return ret; | |
d0ac0380 KW |
5229 | } |
5230 | ||
57f08941 | 5231 | static void bdrv_remove_child_commit(void *opaque) |
46541ee5 | 5232 | { |
bdb73476 | 5233 | GLOBAL_STATE_CODE(); |
5bb04747 | 5234 | bdrv_child_free(opaque); |
82b54cf5 HR |
5235 | } |
5236 | ||
57f08941 VSO |
5237 | static TransactionActionDrv bdrv_remove_child_drv = { |
5238 | .commit = bdrv_remove_child_commit, | |
46541ee5 VSO |
5239 | }; |
5240 | ||
2f64e1fc KW |
5241 | /* |
5242 | * Function doesn't update permissions, caller is responsible for this. | |
5243 | * | |
5244 | * @child->bs (if non-NULL) must be drained. | |
5661a00d KW |
5245 | * |
5246 | * After calling this function, the transaction @tran may only be completed | |
5247 | * while holding a writer lock for the graph. | |
2f64e1fc KW |
5248 | */ |
5249 | static void GRAPH_WRLOCK bdrv_remove_child(BdrvChild *child, Transaction *tran) | |
46541ee5 | 5250 | { |
46541ee5 VSO |
5251 | if (!child) { |
5252 | return; | |
5253 | } | |
5254 | ||
5255 | if (child->bs) { | |
2f64e1fc | 5256 | assert(child->quiesced_parent); |
a2c37a30 | 5257 | bdrv_replace_child_tran(child, NULL, tran); |
46541ee5 VSO |
5258 | } |
5259 | ||
57f08941 | 5260 | tran_add(tran, &bdrv_remove_child_drv, child); |
46541ee5 VSO |
5261 | } |
5262 | ||
2f64e1fc KW |
5263 | /* |
5264 | * Both @from and @to (if non-NULL) must be drained. @to must be kept drained | |
5265 | * until the transaction is completed. | |
5661a00d KW |
5266 | * |
5267 | * After calling this function, the transaction @tran may only be completed | |
5268 | * while holding a writer lock for the graph. | |
2f64e1fc KW |
5269 | */ |
5270 | static int GRAPH_WRLOCK | |
5271 | bdrv_replace_node_noperm(BlockDriverState *from, | |
5272 | BlockDriverState *to, | |
5273 | bool auto_skip, Transaction *tran, | |
5274 | Error **errp) | |
117caba9 VSO |
5275 | { |
5276 | BdrvChild *c, *next; | |
5277 | ||
bdb73476 | 5278 | GLOBAL_STATE_CODE(); |
82b54cf5 | 5279 | |
2f64e1fc KW |
5280 | assert(from->quiesce_counter); |
5281 | assert(to->quiesce_counter); | |
23987471 | 5282 | |
117caba9 VSO |
5283 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
5284 | assert(c->bs == from); | |
5285 | if (!should_update_child(c, to)) { | |
5286 | if (auto_skip) { | |
5287 | continue; | |
5288 | } | |
5289 | error_setg(errp, "Should not change '%s' link to '%s'", | |
5290 | c->name, from->node_name); | |
5291 | return -EINVAL; | |
5292 | } | |
5293 | if (c->frozen) { | |
5294 | error_setg(errp, "Cannot change '%s' link to '%s'", | |
5295 | c->name, from->node_name); | |
5296 | return -EPERM; | |
5297 | } | |
0f0b1e29 | 5298 | bdrv_replace_child_tran(c, to, tran); |
117caba9 VSO |
5299 | } |
5300 | ||
5301 | return 0; | |
5302 | } | |
5303 | ||
313274bb | 5304 | /* |
5c0ef495 KW |
5305 | * Switch all parents of @from to point to @to instead. @from and @to must be in |
5306 | * the same AioContext and both must be drained. | |
5307 | * | |
313274bb VSO |
5308 | * With auto_skip=true bdrv_replace_node_common skips updating from parents |
5309 | * if it creates a parent-child relation loop or if parent is block-job. | |
5310 | * | |
5311 | * With auto_skip=false the error is returned if from has a parent which should | |
5312 | * not be updated. | |
3108a15c VSO |
5313 | * |
5314 | * With @detach_subchain=true @to must be in a backing chain of @from. In this | |
5315 | * case backing link of the cow-parent of @to is removed. | |
313274bb | 5316 | */ |
5c0ef495 KW |
5317 | static int GRAPH_WRLOCK |
5318 | bdrv_replace_node_common(BlockDriverState *from, BlockDriverState *to, | |
5319 | bool auto_skip, bool detach_subchain, Error **errp) | |
dd62f1ca | 5320 | { |
3bb0e298 | 5321 | Transaction *tran = tran_new(); |
3bb0e298 | 5322 | g_autoptr(GSList) refresh_list = NULL; |
2d369d6e | 5323 | BlockDriverState *to_cow_parent = NULL; |
234ac1a9 KW |
5324 | int ret; |
5325 | ||
bdb73476 | 5326 | GLOBAL_STATE_CODE(); |
82b54cf5 | 5327 | |
5c0ef495 KW |
5328 | assert(from->quiesce_counter); |
5329 | assert(to->quiesce_counter); | |
30dd65f3 | 5330 | assert(bdrv_get_aio_context(from) == bdrv_get_aio_context(to)); |
f871abd6 | 5331 | |
372b69f5 KW |
5332 | if (detach_subchain) { |
5333 | assert(bdrv_chain_contains(from, to)); | |
5334 | assert(from != to); | |
5335 | for (to_cow_parent = from; | |
5336 | bdrv_filter_or_cow_bs(to_cow_parent) != to; | |
5337 | to_cow_parent = bdrv_filter_or_cow_bs(to_cow_parent)) | |
5338 | { | |
5339 | ; | |
5340 | } | |
5341 | } | |
5342 | ||
3bb0e298 VSO |
5343 | /* |
5344 | * Do the replacement without permission update. | |
5345 | * Replacement may influence the permissions, we should calculate new | |
5346 | * permissions based on new graph. If we fail, we'll roll-back the | |
5347 | * replacement. | |
5348 | */ | |
117caba9 VSO |
5349 | ret = bdrv_replace_node_noperm(from, to, auto_skip, tran, errp); |
5350 | if (ret < 0) { | |
5351 | goto out; | |
234ac1a9 KW |
5352 | } |
5353 | ||
3108a15c | 5354 | if (detach_subchain) { |
2f64e1fc | 5355 | /* to_cow_parent is already drained because from is drained */ |
f38eaec4 | 5356 | bdrv_remove_child(bdrv_filter_or_cow_child(to_cow_parent), tran); |
3108a15c VSO |
5357 | } |
5358 | ||
fb0ff4d1 VSO |
5359 | refresh_list = g_slist_prepend(refresh_list, to); |
5360 | refresh_list = g_slist_prepend(refresh_list, from); | |
9bd910e2 | 5361 | |
3bb0e298 VSO |
5362 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); |
5363 | if (ret < 0) { | |
5364 | goto out; | |
dd62f1ca | 5365 | } |
234ac1a9 | 5366 | |
a1e708fc VSO |
5367 | ret = 0; |
5368 | ||
234ac1a9 | 5369 | out: |
3bb0e298 | 5370 | tran_finalize(tran, ret); |
a1e708fc | 5371 | return ret; |
dd62f1ca KW |
5372 | } |
5373 | ||
a1e708fc VSO |
5374 | int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
5375 | Error **errp) | |
313274bb | 5376 | { |
ccd6a379 | 5377 | return bdrv_replace_node_common(from, to, true, false, errp); |
3108a15c VSO |
5378 | } |
5379 | ||
5380 | int bdrv_drop_filter(BlockDriverState *bs, Error **errp) | |
5381 | { | |
372b69f5 | 5382 | BlockDriverState *child_bs; |
5c0ef495 | 5383 | int ret; |
372b69f5 | 5384 | |
f791bf7f | 5385 | GLOBAL_STATE_CODE(); |
5c0ef495 | 5386 | |
372b69f5 KW |
5387 | bdrv_graph_rdlock_main_loop(); |
5388 | child_bs = bdrv_filter_or_cow_bs(bs); | |
5389 | bdrv_graph_rdunlock_main_loop(); | |
f791bf7f | 5390 | |
5c0ef495 | 5391 | bdrv_drained_begin(child_bs); |
6bc30f19 | 5392 | bdrv_graph_wrlock(); |
5c0ef495 | 5393 | ret = bdrv_replace_node_common(bs, child_bs, true, true, errp); |
6bc30f19 | 5394 | bdrv_graph_wrunlock(); |
5c0ef495 KW |
5395 | bdrv_drained_end(child_bs); |
5396 | ||
5397 | return ret; | |
313274bb VSO |
5398 | } |
5399 | ||
4ddc07ca PB |
5400 | /* |
5401 | * Add new bs contents at the top of an image chain while the chain is | |
5402 | * live, while keeping required fields on the top layer. | |
5403 | * | |
5404 | * This will modify the BlockDriverState fields, and swap contents | |
5405 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
5406 | * | |
2272edcf VSO |
5407 | * bs_new must not be attached to a BlockBackend and must not have backing |
5408 | * child. | |
4ddc07ca PB |
5409 | * |
5410 | * This function does not create any image files. | |
5411 | */ | |
a1e708fc VSO |
5412 | int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
5413 | Error **errp) | |
4ddc07ca | 5414 | { |
2272edcf | 5415 | int ret; |
5bb04747 | 5416 | BdrvChild *child; |
2272edcf VSO |
5417 | Transaction *tran = tran_new(); |
5418 | ||
f791bf7f EGE |
5419 | GLOBAL_STATE_CODE(); |
5420 | ||
004915a9 | 5421 | bdrv_graph_rdlock_main_loop(); |
2272edcf | 5422 | assert(!bs_new->backing); |
004915a9 | 5423 | bdrv_graph_rdunlock_main_loop(); |
2272edcf | 5424 | |
7d4ca9d2 | 5425 | bdrv_drained_begin(bs_top); |
7d4ca9d2 | 5426 | bdrv_drained_begin(bs_new); |
7d4ca9d2 | 5427 | |
6bc30f19 | 5428 | bdrv_graph_wrlock(); |
60d90bf4 | 5429 | |
5bb04747 VSO |
5430 | child = bdrv_attach_child_noperm(bs_new, bs_top, "backing", |
5431 | &child_of_bds, bdrv_backing_role(bs_new), | |
5432 | tran, errp); | |
5433 | if (!child) { | |
5434 | ret = -EINVAL; | |
2272edcf | 5435 | goto out; |
b2c2832c | 5436 | } |
dd62f1ca | 5437 | |
2272edcf | 5438 | ret = bdrv_replace_node_noperm(bs_top, bs_new, true, tran, errp); |
a1e708fc | 5439 | if (ret < 0) { |
2272edcf | 5440 | goto out; |
234ac1a9 | 5441 | } |
4ddc07ca | 5442 | |
f1316edb | 5443 | ret = bdrv_refresh_perms(bs_new, tran, errp); |
2272edcf VSO |
5444 | out: |
5445 | tran_finalize(tran, ret); | |
5446 | ||
1e4c797c | 5447 | bdrv_refresh_limits(bs_top, NULL, NULL); |
6bc30f19 | 5448 | bdrv_graph_wrunlock(); |
2272edcf | 5449 | |
7d4ca9d2 KW |
5450 | bdrv_drained_end(bs_top); |
5451 | bdrv_drained_end(bs_new); | |
2f64e1fc | 5452 | |
2272edcf | 5453 | return ret; |
8802d1fd JC |
5454 | } |
5455 | ||
bd8f4c42 VSO |
5456 | /* Not for empty child */ |
5457 | int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs, | |
5458 | Error **errp) | |
5459 | { | |
5460 | int ret; | |
5461 | Transaction *tran = tran_new(); | |
bd8f4c42 VSO |
5462 | g_autoptr(GSList) refresh_list = NULL; |
5463 | BlockDriverState *old_bs = child->bs; | |
5464 | ||
f791bf7f EGE |
5465 | GLOBAL_STATE_CODE(); |
5466 | ||
bd8f4c42 VSO |
5467 | bdrv_ref(old_bs); |
5468 | bdrv_drained_begin(old_bs); | |
5469 | bdrv_drained_begin(new_bs); | |
6bc30f19 | 5470 | bdrv_graph_wrlock(); |
bd8f4c42 | 5471 | |
0f0b1e29 | 5472 | bdrv_replace_child_tran(child, new_bs, tran); |
bd8f4c42 | 5473 | |
fb0ff4d1 VSO |
5474 | refresh_list = g_slist_prepend(refresh_list, old_bs); |
5475 | refresh_list = g_slist_prepend(refresh_list, new_bs); | |
bd8f4c42 VSO |
5476 | |
5477 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); | |
5478 | ||
5479 | tran_finalize(tran, ret); | |
5480 | ||
6bc30f19 | 5481 | bdrv_graph_wrunlock(); |
bd8f4c42 VSO |
5482 | bdrv_drained_end(old_bs); |
5483 | bdrv_drained_end(new_bs); | |
5484 | bdrv_unref(old_bs); | |
5485 | ||
5486 | return ret; | |
5487 | } | |
5488 | ||
4f6fd349 | 5489 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 5490 | { |
3718d8ab | 5491 | assert(bdrv_op_blocker_is_empty(bs)); |
4f6fd349 | 5492 | assert(!bs->refcnt); |
f791bf7f | 5493 | GLOBAL_STATE_CODE(); |
18846dee | 5494 | |
1b7bdbc1 | 5495 | /* remove from list, if necessary */ |
63eaaae0 KW |
5496 | if (bs->node_name[0] != '\0') { |
5497 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
5498 | } | |
2c1d04e0 HR |
5499 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
5500 | ||
30c321f9 AK |
5501 | bdrv_close(bs); |
5502 | ||
fa9185fc SH |
5503 | qemu_mutex_destroy(&bs->reqs_lock); |
5504 | ||
7267c094 | 5505 | g_free(bs); |
fc01f7e7 FB |
5506 | } |
5507 | ||
96796fae VSO |
5508 | |
5509 | /* | |
5510 | * Replace @bs by newly created block node. | |
5511 | * | |
5512 | * @options is a QDict of options to pass to the block drivers, or NULL for an | |
5513 | * empty set of options. The reference to the QDict belongs to the block layer | |
5514 | * after the call (even on failure), so if the caller intends to reuse the | |
5515 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. | |
8823407c | 5516 | * |
23c983c8 SH |
5517 | * The caller must make sure that @bs stays in the same AioContext, i.e. |
5518 | * @options must not refer to nodes in a different AioContext. | |
96796fae VSO |
5519 | */ |
5520 | BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options, | |
8872ef78 AS |
5521 | int flags, Error **errp) |
5522 | { | |
f053b7e8 VSO |
5523 | ERRP_GUARD(); |
5524 | int ret; | |
8823407c | 5525 | AioContext *ctx = bdrv_get_aio_context(bs); |
b11c8739 VSO |
5526 | BlockDriverState *new_node_bs = NULL; |
5527 | const char *drvname, *node_name; | |
5528 | BlockDriver *drv; | |
5529 | ||
5530 | drvname = qdict_get_try_str(options, "driver"); | |
5531 | if (!drvname) { | |
5532 | error_setg(errp, "driver is not specified"); | |
5533 | goto fail; | |
5534 | } | |
5535 | ||
5536 | drv = bdrv_find_format(drvname); | |
5537 | if (!drv) { | |
5538 | error_setg(errp, "Unknown driver: '%s'", drvname); | |
5539 | goto fail; | |
5540 | } | |
8872ef78 | 5541 | |
b11c8739 VSO |
5542 | node_name = qdict_get_try_str(options, "node-name"); |
5543 | ||
f791bf7f EGE |
5544 | GLOBAL_STATE_CODE(); |
5545 | ||
b11c8739 VSO |
5546 | new_node_bs = bdrv_new_open_driver_opts(drv, node_name, options, flags, |
5547 | errp); | |
8823407c KW |
5548 | assert(bdrv_get_aio_context(bs) == ctx); |
5549 | ||
b11c8739 VSO |
5550 | options = NULL; /* bdrv_new_open_driver() eats options */ |
5551 | if (!new_node_bs) { | |
8872ef78 | 5552 | error_prepend(errp, "Could not create node: "); |
b11c8739 | 5553 | goto fail; |
8872ef78 AS |
5554 | } |
5555 | ||
ccd6a379 KW |
5556 | /* |
5557 | * Make sure that @bs doesn't go away until we have successfully attached | |
5558 | * all of its parents to @new_node_bs and undrained it again. | |
5559 | */ | |
5560 | bdrv_ref(bs); | |
8872ef78 | 5561 | bdrv_drained_begin(bs); |
ccd6a379 | 5562 | bdrv_drained_begin(new_node_bs); |
6bc30f19 | 5563 | bdrv_graph_wrlock(); |
f053b7e8 | 5564 | ret = bdrv_replace_node(bs, new_node_bs, errp); |
6bc30f19 | 5565 | bdrv_graph_wrunlock(); |
ccd6a379 | 5566 | bdrv_drained_end(new_node_bs); |
8872ef78 | 5567 | bdrv_drained_end(bs); |
ccd6a379 | 5568 | bdrv_unref(bs); |
8872ef78 | 5569 | |
f053b7e8 VSO |
5570 | if (ret < 0) { |
5571 | error_prepend(errp, "Could not replace node: "); | |
b11c8739 | 5572 | goto fail; |
8872ef78 AS |
5573 | } |
5574 | ||
5575 | return new_node_bs; | |
b11c8739 VSO |
5576 | |
5577 | fail: | |
5578 | qobject_unref(options); | |
5579 | bdrv_unref(new_node_bs); | |
5580 | return NULL; | |
8872ef78 AS |
5581 | } |
5582 | ||
e97fc193 AL |
5583 | /* |
5584 | * Run consistency checks on an image | |
5585 | * | |
e076f338 | 5586 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 5587 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 5588 | * check are stored in res. |
e97fc193 | 5589 | */ |
21c2283e VSO |
5590 | int coroutine_fn bdrv_co_check(BlockDriverState *bs, |
5591 | BdrvCheckResult *res, BdrvCheckMode fix) | |
e97fc193 | 5592 | { |
1581a70d | 5593 | IO_CODE(); |
1b3ff9fe | 5594 | assert_bdrv_graph_readable(); |
908bcd54 HR |
5595 | if (bs->drv == NULL) { |
5596 | return -ENOMEDIUM; | |
5597 | } | |
2fd61638 | 5598 | if (bs->drv->bdrv_co_check == NULL) { |
e97fc193 AL |
5599 | return -ENOTSUP; |
5600 | } | |
5601 | ||
e076f338 | 5602 | memset(res, 0, sizeof(*res)); |
2fd61638 PB |
5603 | return bs->drv->bdrv_co_check(bs, res, fix); |
5604 | } | |
5605 | ||
756e6736 KW |
5606 | /* |
5607 | * Return values: | |
5608 | * 0 - success | |
5609 | * -EINVAL - backing format specified, but no file | |
5610 | * -ENOSPC - can't update the backing file because no space is left in the | |
5611 | * image file header | |
5612 | * -ENOTSUP - format driver doesn't support changing the backing file | |
5613 | */ | |
e2dd2737 KW |
5614 | int coroutine_fn |
5615 | bdrv_co_change_backing_file(BlockDriverState *bs, const char *backing_file, | |
5616 | const char *backing_fmt, bool require) | |
756e6736 KW |
5617 | { |
5618 | BlockDriver *drv = bs->drv; | |
469ef350 | 5619 | int ret; |
756e6736 | 5620 | |
e2dd2737 | 5621 | IO_CODE(); |
f791bf7f | 5622 | |
d470ad42 HR |
5623 | if (!drv) { |
5624 | return -ENOMEDIUM; | |
5625 | } | |
5626 | ||
5f377794 PB |
5627 | /* Backing file format doesn't make sense without a backing file */ |
5628 | if (backing_fmt && !backing_file) { | |
5629 | return -EINVAL; | |
5630 | } | |
5631 | ||
497a30db EB |
5632 | if (require && backing_file && !backing_fmt) { |
5633 | return -EINVAL; | |
e54ee1b3 EB |
5634 | } |
5635 | ||
e2dd2737 KW |
5636 | if (drv->bdrv_co_change_backing_file != NULL) { |
5637 | ret = drv->bdrv_co_change_backing_file(bs, backing_file, backing_fmt); | |
756e6736 | 5638 | } else { |
469ef350 | 5639 | ret = -ENOTSUP; |
756e6736 | 5640 | } |
469ef350 PB |
5641 | |
5642 | if (ret == 0) { | |
5643 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
5644 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
998c2019 HR |
5645 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
5646 | backing_file ?: ""); | |
469ef350 PB |
5647 | } |
5648 | return ret; | |
756e6736 KW |
5649 | } |
5650 | ||
6ebdcee2 | 5651 | /* |
dcf3f9b2 HR |
5652 | * Finds the first non-filter node above bs in the chain between |
5653 | * active and bs. The returned node is either an immediate parent of | |
5654 | * bs, or there are only filter nodes between the two. | |
6ebdcee2 JC |
5655 | * |
5656 | * Returns NULL if bs is not found in active's image chain, | |
5657 | * or if active == bs. | |
4caf0fcd JC |
5658 | * |
5659 | * Returns the bottommost base image if bs == NULL. | |
6ebdcee2 JC |
5660 | */ |
5661 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
5662 | BlockDriverState *bs) | |
5663 | { | |
f791bf7f EGE |
5664 | |
5665 | GLOBAL_STATE_CODE(); | |
5666 | ||
dcf3f9b2 HR |
5667 | bs = bdrv_skip_filters(bs); |
5668 | active = bdrv_skip_filters(active); | |
5669 | ||
5670 | while (active) { | |
5671 | BlockDriverState *next = bdrv_backing_chain_next(active); | |
5672 | if (bs == next) { | |
5673 | return active; | |
5674 | } | |
5675 | active = next; | |
6ebdcee2 JC |
5676 | } |
5677 | ||
dcf3f9b2 | 5678 | return NULL; |
4caf0fcd | 5679 | } |
6ebdcee2 | 5680 | |
4caf0fcd JC |
5681 | /* Given a BDS, searches for the base layer. */ |
5682 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) | |
5683 | { | |
f791bf7f EGE |
5684 | GLOBAL_STATE_CODE(); |
5685 | ||
4caf0fcd | 5686 | return bdrv_find_overlay(bs, NULL); |
6ebdcee2 JC |
5687 | } |
5688 | ||
2cad1ebe | 5689 | /* |
7b99a266 HR |
5690 | * Return true if at least one of the COW (backing) and filter links |
5691 | * between @bs and @base is frozen. @errp is set if that's the case. | |
0f0998f6 | 5692 | * @base must be reachable from @bs, or NULL. |
2cad1ebe | 5693 | */ |
9275fc72 KW |
5694 | static bool GRAPH_RDLOCK |
5695 | bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, | |
5696 | Error **errp) | |
2cad1ebe AG |
5697 | { |
5698 | BlockDriverState *i; | |
7b99a266 | 5699 | BdrvChild *child; |
2cad1ebe | 5700 | |
f791bf7f EGE |
5701 | GLOBAL_STATE_CODE(); |
5702 | ||
7b99a266 HR |
5703 | for (i = bs; i != base; i = child_bs(child)) { |
5704 | child = bdrv_filter_or_cow_child(i); | |
5705 | ||
5706 | if (child && child->frozen) { | |
2cad1ebe | 5707 | error_setg(errp, "Cannot change '%s' link from '%s' to '%s'", |
7b99a266 | 5708 | child->name, i->node_name, child->bs->node_name); |
2cad1ebe AG |
5709 | return true; |
5710 | } | |
5711 | } | |
5712 | ||
5713 | return false; | |
5714 | } | |
5715 | ||
5716 | /* | |
7b99a266 | 5717 | * Freeze all COW (backing) and filter links between @bs and @base. |
2cad1ebe AG |
5718 | * If any of the links is already frozen the operation is aborted and |
5719 | * none of the links are modified. | |
0f0998f6 | 5720 | * @base must be reachable from @bs, or NULL. |
2cad1ebe AG |
5721 | * Returns 0 on success. On failure returns < 0 and sets @errp. |
5722 | */ | |
5723 | int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, | |
5724 | Error **errp) | |
5725 | { | |
5726 | BlockDriverState *i; | |
7b99a266 | 5727 | BdrvChild *child; |
2cad1ebe | 5728 | |
f791bf7f EGE |
5729 | GLOBAL_STATE_CODE(); |
5730 | ||
2cad1ebe AG |
5731 | if (bdrv_is_backing_chain_frozen(bs, base, errp)) { |
5732 | return -EPERM; | |
5733 | } | |
5734 | ||
7b99a266 HR |
5735 | for (i = bs; i != base; i = child_bs(child)) { |
5736 | child = bdrv_filter_or_cow_child(i); | |
5737 | if (child && child->bs->never_freeze) { | |
e5182c1c | 5738 | error_setg(errp, "Cannot freeze '%s' link to '%s'", |
7b99a266 | 5739 | child->name, child->bs->node_name); |
e5182c1c HR |
5740 | return -EPERM; |
5741 | } | |
5742 | } | |
5743 | ||
7b99a266 HR |
5744 | for (i = bs; i != base; i = child_bs(child)) { |
5745 | child = bdrv_filter_or_cow_child(i); | |
5746 | if (child) { | |
5747 | child->frozen = true; | |
0f0998f6 | 5748 | } |
2cad1ebe AG |
5749 | } |
5750 | ||
5751 | return 0; | |
5752 | } | |
5753 | ||
5754 | /* | |
7b99a266 HR |
5755 | * Unfreeze all COW (backing) and filter links between @bs and @base. |
5756 | * The caller must ensure that all links are frozen before using this | |
5757 | * function. | |
0f0998f6 | 5758 | * @base must be reachable from @bs, or NULL. |
2cad1ebe AG |
5759 | */ |
5760 | void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base) | |
5761 | { | |
5762 | BlockDriverState *i; | |
7b99a266 | 5763 | BdrvChild *child; |
2cad1ebe | 5764 | |
f791bf7f EGE |
5765 | GLOBAL_STATE_CODE(); |
5766 | ||
7b99a266 HR |
5767 | for (i = bs; i != base; i = child_bs(child)) { |
5768 | child = bdrv_filter_or_cow_child(i); | |
5769 | if (child) { | |
5770 | assert(child->frozen); | |
5771 | child->frozen = false; | |
0f0998f6 | 5772 | } |
2cad1ebe AG |
5773 | } |
5774 | } | |
5775 | ||
6ebdcee2 JC |
5776 | /* |
5777 | * Drops images above 'base' up to and including 'top', and sets the image | |
5778 | * above 'top' to have base as its backing file. | |
5779 | * | |
5780 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
5781 | * information in 'bs' can be properly updated. | |
5782 | * | |
5783 | * E.g., this will convert the following chain: | |
5784 | * bottom <- base <- intermediate <- top <- active | |
5785 | * | |
5786 | * to | |
5787 | * | |
5788 | * bottom <- base <- active | |
5789 | * | |
5790 | * It is allowed for bottom==base, in which case it converts: | |
5791 | * | |
5792 | * base <- intermediate <- top <- active | |
5793 | * | |
5794 | * to | |
5795 | * | |
5796 | * base <- active | |
5797 | * | |
54e26900 JC |
5798 | * If backing_file_str is non-NULL, it will be used when modifying top's |
5799 | * overlay image metadata. | |
5800 | * | |
6ebdcee2 JC |
5801 | * Error conditions: |
5802 | * if active == top, that is considered an error | |
5803 | * | |
5804 | */ | |
bde70715 KW |
5805 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
5806 | const char *backing_file_str) | |
6ebdcee2 | 5807 | { |
6bd858b3 AG |
5808 | BlockDriverState *explicit_top = top; |
5809 | bool update_inherits_from; | |
d669ed6a | 5810 | BdrvChild *c; |
12fa4af6 | 5811 | Error *local_err = NULL; |
6ebdcee2 | 5812 | int ret = -EIO; |
d669ed6a VSO |
5813 | g_autoptr(GSList) updated_children = NULL; |
5814 | GSList *p; | |
6ebdcee2 | 5815 | |
f791bf7f EGE |
5816 | GLOBAL_STATE_CODE(); |
5817 | ||
6858eba0 | 5818 | bdrv_ref(top); |
631086de | 5819 | bdrv_drained_begin(base); |
6bc30f19 | 5820 | bdrv_graph_wrlock(); |
6858eba0 | 5821 | |
6ebdcee2 | 5822 | if (!top->drv || !base->drv) { |
5c0ef495 | 5823 | goto exit_wrlock; |
6ebdcee2 JC |
5824 | } |
5825 | ||
5db15a57 KW |
5826 | /* Make sure that base is in the backing chain of top */ |
5827 | if (!bdrv_chain_contains(top, base)) { | |
5c0ef495 | 5828 | goto exit_wrlock; |
6ebdcee2 JC |
5829 | } |
5830 | ||
6bd858b3 AG |
5831 | /* If 'base' recursively inherits from 'top' then we should set |
5832 | * base->inherits_from to top->inherits_from after 'top' and all | |
5833 | * other intermediate nodes have been dropped. | |
5834 | * If 'top' is an implicit node (e.g. "commit_top") we should skip | |
5835 | * it because no one inherits from it. We use explicit_top for that. */ | |
dcf3f9b2 | 5836 | explicit_top = bdrv_skip_implicit_filters(explicit_top); |
6bd858b3 AG |
5837 | update_inherits_from = bdrv_inherits_from_recursive(base, explicit_top); |
5838 | ||
6ebdcee2 | 5839 | /* success - we can delete the intermediate states, and link top->base */ |
f30c66ba HR |
5840 | if (!backing_file_str) { |
5841 | bdrv_refresh_filename(base); | |
5842 | backing_file_str = base->filename; | |
5843 | } | |
61f09cea | 5844 | |
d669ed6a VSO |
5845 | QLIST_FOREACH(c, &top->parents, next_parent) { |
5846 | updated_children = g_slist_prepend(updated_children, c); | |
5847 | } | |
5848 | ||
3108a15c VSO |
5849 | /* |
5850 | * It seems correct to pass detach_subchain=true here, but it triggers | |
5851 | * one more yet not fixed bug, when due to nested aio_poll loop we switch to | |
5852 | * another drained section, which modify the graph (for example, removing | |
5853 | * the child, which we keep in updated_children list). So, it's a TODO. | |
5854 | * | |
5855 | * Note, bug triggered if pass detach_subchain=true here and run | |
5856 | * test-bdrv-drain. test_drop_intermediate_poll() test-case will crash. | |
5857 | * That's a FIXME. | |
5858 | */ | |
5859 | bdrv_replace_node_common(top, base, false, false, &local_err); | |
6bc30f19 | 5860 | bdrv_graph_wrunlock(); |
5c0ef495 | 5861 | |
d669ed6a VSO |
5862 | if (local_err) { |
5863 | error_report_err(local_err); | |
5864 | goto exit; | |
5865 | } | |
5866 | ||
5867 | for (p = updated_children; p; p = p->next) { | |
5868 | c = p->data; | |
12fa4af6 | 5869 | |
bd86fb99 HR |
5870 | if (c->klass->update_filename) { |
5871 | ret = c->klass->update_filename(c, base, backing_file_str, | |
5872 | &local_err); | |
61f09cea | 5873 | if (ret < 0) { |
d669ed6a VSO |
5874 | /* |
5875 | * TODO: Actually, we want to rollback all previous iterations | |
5876 | * of this loop, and (which is almost impossible) previous | |
5877 | * bdrv_replace_node()... | |
5878 | * | |
5879 | * Note, that c->klass->update_filename may lead to permission | |
5880 | * update, so it's a bad idea to call it inside permission | |
5881 | * update transaction of bdrv_replace_node. | |
5882 | */ | |
61f09cea KW |
5883 | error_report_err(local_err); |
5884 | goto exit; | |
5885 | } | |
5886 | } | |
12fa4af6 | 5887 | } |
6ebdcee2 | 5888 | |
6bd858b3 AG |
5889 | if (update_inherits_from) { |
5890 | base->inherits_from = explicit_top->inherits_from; | |
5891 | } | |
5892 | ||
6ebdcee2 | 5893 | ret = 0; |
5c0ef495 KW |
5894 | goto exit; |
5895 | ||
5896 | exit_wrlock: | |
6bc30f19 | 5897 | bdrv_graph_wrunlock(); |
6ebdcee2 | 5898 | exit: |
631086de | 5899 | bdrv_drained_end(base); |
6858eba0 | 5900 | bdrv_unref(top); |
6ebdcee2 JC |
5901 | return ret; |
5902 | } | |
5903 | ||
081e4650 | 5904 | /** |
82618d7b | 5905 | * Implementation of BlockDriver.bdrv_co_get_allocated_file_size() that |
081e4650 HR |
5906 | * sums the size of all data-bearing children. (This excludes backing |
5907 | * children.) | |
5908 | */ | |
de335638 EGE |
5909 | static int64_t coroutine_fn GRAPH_RDLOCK |
5910 | bdrv_sum_allocated_file_size(BlockDriverState *bs) | |
081e4650 HR |
5911 | { |
5912 | BdrvChild *child; | |
5913 | int64_t child_size, sum = 0; | |
5914 | ||
5915 | QLIST_FOREACH(child, &bs->children, next) { | |
5916 | if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | | |
5917 | BDRV_CHILD_FILTERED)) | |
5918 | { | |
82618d7b | 5919 | child_size = bdrv_co_get_allocated_file_size(child->bs); |
081e4650 HR |
5920 | if (child_size < 0) { |
5921 | return child_size; | |
5922 | } | |
5923 | sum += child_size; | |
5924 | } | |
5925 | } | |
5926 | ||
5927 | return sum; | |
5928 | } | |
5929 | ||
61007b31 SH |
5930 | /** |
5931 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
5932 | * allocated space. Return < 0 if error or unknown. | |
5933 | */ | |
82618d7b | 5934 | int64_t coroutine_fn bdrv_co_get_allocated_file_size(BlockDriverState *bs) |
71d0770c | 5935 | { |
61007b31 | 5936 | BlockDriver *drv = bs->drv; |
384a48fb | 5937 | IO_CODE(); |
de335638 | 5938 | assert_bdrv_graph_readable(); |
384a48fb | 5939 | |
61007b31 SH |
5940 | if (!drv) { |
5941 | return -ENOMEDIUM; | |
8f4754ed | 5942 | } |
82618d7b EGE |
5943 | if (drv->bdrv_co_get_allocated_file_size) { |
5944 | return drv->bdrv_co_get_allocated_file_size(bs); | |
61007b31 | 5945 | } |
081e4650 HR |
5946 | |
5947 | if (drv->bdrv_file_open) { | |
5948 | /* | |
5949 | * Protocol drivers default to -ENOTSUP (most of their data is | |
5950 | * not stored in any of their children (if they even have any), | |
5951 | * so there is no generic way to figure it out). | |
5952 | */ | |
5953 | return -ENOTSUP; | |
5954 | } else if (drv->is_filter) { | |
5955 | /* Filter drivers default to the size of their filtered child */ | |
82618d7b | 5956 | return bdrv_co_get_allocated_file_size(bdrv_filter_bs(bs)); |
081e4650 HR |
5957 | } else { |
5958 | /* Other drivers default to summing their children's sizes */ | |
5959 | return bdrv_sum_allocated_file_size(bs); | |
1c9805a3 SH |
5960 | } |
5961 | } | |
e7a8a783 | 5962 | |
90880ff1 SH |
5963 | /* |
5964 | * bdrv_measure: | |
5965 | * @drv: Format driver | |
5966 | * @opts: Creation options for new image | |
5967 | * @in_bs: Existing image containing data for new image (may be NULL) | |
5968 | * @errp: Error object | |
5969 | * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo()) | |
5970 | * or NULL on error | |
5971 | * | |
5972 | * Calculate file size required to create a new image. | |
5973 | * | |
5974 | * If @in_bs is given then space for allocated clusters and zero clusters | |
5975 | * from that image are included in the calculation. If @opts contains a | |
5976 | * backing file that is shared by @in_bs then backing clusters may be omitted | |
5977 | * from the calculation. | |
5978 | * | |
5979 | * If @in_bs is NULL then the calculation includes no allocated clusters | |
5980 | * unless a preallocation option is given in @opts. | |
5981 | * | |
5982 | * Note that @in_bs may use a different BlockDriver from @drv. | |
5983 | * | |
5984 | * If an error occurs the @errp pointer is set. | |
5985 | */ | |
5986 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, | |
5987 | BlockDriverState *in_bs, Error **errp) | |
5988 | { | |
384a48fb | 5989 | IO_CODE(); |
90880ff1 SH |
5990 | if (!drv->bdrv_measure) { |
5991 | error_setg(errp, "Block driver '%s' does not support size measurement", | |
5992 | drv->format_name); | |
5993 | return NULL; | |
5994 | } | |
5995 | ||
5996 | return drv->bdrv_measure(opts, in_bs, errp); | |
5997 | } | |
5998 | ||
61007b31 SH |
5999 | /** |
6000 | * Return number of sectors on success, -errno on error. | |
1c9805a3 | 6001 | */ |
c86422c5 | 6002 | int64_t coroutine_fn bdrv_co_nb_sectors(BlockDriverState *bs) |
1c9805a3 | 6003 | { |
61007b31 | 6004 | BlockDriver *drv = bs->drv; |
384a48fb | 6005 | IO_CODE(); |
8ab8140a | 6006 | assert_bdrv_graph_readable(); |
498e386c | 6007 | |
61007b31 SH |
6008 | if (!drv) |
6009 | return -ENOMEDIUM; | |
2572b37a | 6010 | |
160a29e2 | 6011 | if (bs->bl.has_variable_length) { |
c86422c5 | 6012 | int ret = bdrv_co_refresh_total_sectors(bs, bs->total_sectors); |
61007b31 SH |
6013 | if (ret < 0) { |
6014 | return ret; | |
1c9805a3 SH |
6015 | } |
6016 | } | |
61007b31 | 6017 | return bs->total_sectors; |
1c9805a3 | 6018 | } |
b338082b | 6019 | |
81f730d4 PB |
6020 | /* |
6021 | * This wrapper is written by hand because this function is in the hot I/O path, | |
6022 | * via blk_get_geometry. | |
6023 | */ | |
6024 | int64_t coroutine_mixed_fn bdrv_nb_sectors(BlockDriverState *bs) | |
6025 | { | |
6026 | BlockDriver *drv = bs->drv; | |
6027 | IO_CODE(); | |
6028 | ||
6029 | if (!drv) | |
6030 | return -ENOMEDIUM; | |
6031 | ||
6032 | if (bs->bl.has_variable_length) { | |
6033 | int ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); | |
6034 | if (ret < 0) { | |
6035 | return ret; | |
6036 | } | |
6037 | } | |
6038 | ||
6039 | return bs->total_sectors; | |
6040 | } | |
6041 | ||
61007b31 SH |
6042 | /** |
6043 | * Return length in bytes on success, -errno on error. | |
6044 | * The length is always a multiple of BDRV_SECTOR_SIZE. | |
8d3b1a2d | 6045 | */ |
c86422c5 | 6046 | int64_t coroutine_fn bdrv_co_getlength(BlockDriverState *bs) |
8d3b1a2d | 6047 | { |
c86422c5 | 6048 | int64_t ret; |
384a48fb | 6049 | IO_CODE(); |
8ab8140a | 6050 | assert_bdrv_graph_readable(); |
8d3b1a2d | 6051 | |
c86422c5 | 6052 | ret = bdrv_co_nb_sectors(bs); |
122860ba EB |
6053 | if (ret < 0) { |
6054 | return ret; | |
6055 | } | |
6056 | if (ret > INT64_MAX / BDRV_SECTOR_SIZE) { | |
6057 | return -EFBIG; | |
6058 | } | |
6059 | return ret * BDRV_SECTOR_SIZE; | |
fc01f7e7 FB |
6060 | } |
6061 | ||
54115412 | 6062 | bool bdrv_is_sg(BlockDriverState *bs) |
f08145fe | 6063 | { |
384a48fb | 6064 | IO_CODE(); |
61007b31 | 6065 | return bs->sg; |
f08145fe KW |
6066 | } |
6067 | ||
ae23f786 HR |
6068 | /** |
6069 | * Return whether the given node supports compressed writes. | |
6070 | */ | |
6071 | bool bdrv_supports_compressed_writes(BlockDriverState *bs) | |
6072 | { | |
6073 | BlockDriverState *filtered; | |
384a48fb | 6074 | IO_CODE(); |
ae23f786 HR |
6075 | |
6076 | if (!bs->drv || !block_driver_can_compress(bs->drv)) { | |
6077 | return false; | |
6078 | } | |
6079 | ||
6080 | filtered = bdrv_filter_bs(bs); | |
6081 | if (filtered) { | |
6082 | /* | |
6083 | * Filters can only forward compressed writes, so we have to | |
6084 | * check the child. | |
6085 | */ | |
6086 | return bdrv_supports_compressed_writes(filtered); | |
6087 | } | |
6088 | ||
6089 | return true; | |
6090 | } | |
6091 | ||
61007b31 | 6092 | const char *bdrv_get_format_name(BlockDriverState *bs) |
40b4f539 | 6093 | { |
384a48fb | 6094 | IO_CODE(); |
61007b31 | 6095 | return bs->drv ? bs->drv->format_name : NULL; |
40b4f539 KW |
6096 | } |
6097 | ||
61007b31 | 6098 | static int qsort_strcmp(const void *a, const void *b) |
40b4f539 | 6099 | { |
ceff5bd7 | 6100 | return strcmp(*(char *const *)a, *(char *const *)b); |
40b4f539 KW |
6101 | } |
6102 | ||
61007b31 | 6103 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
9ac404c5 | 6104 | void *opaque, bool read_only) |
40b4f539 | 6105 | { |
61007b31 SH |
6106 | BlockDriver *drv; |
6107 | int count = 0; | |
6108 | int i; | |
6109 | const char **formats = NULL; | |
40b4f539 | 6110 | |
f791bf7f EGE |
6111 | GLOBAL_STATE_CODE(); |
6112 | ||
61007b31 SH |
6113 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
6114 | if (drv->format_name) { | |
6115 | bool found = false; | |
9ac404c5 AS |
6116 | |
6117 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, read_only)) { | |
6118 | continue; | |
6119 | } | |
6120 | ||
fb2575f9 | 6121 | i = count; |
61007b31 SH |
6122 | while (formats && i && !found) { |
6123 | found = !strcmp(formats[--i], drv->format_name); | |
6124 | } | |
e2a305fb | 6125 | |
61007b31 SH |
6126 | if (!found) { |
6127 | formats = g_renew(const char *, formats, count + 1); | |
6128 | formats[count++] = drv->format_name; | |
6129 | } | |
6c5a42ac | 6130 | } |
61007b31 | 6131 | } |
6c5a42ac | 6132 | |
eb0df69f HR |
6133 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); i++) { |
6134 | const char *format_name = block_driver_modules[i].format_name; | |
6135 | ||
6136 | if (format_name) { | |
6137 | bool found = false; | |
6138 | int j = count; | |
6139 | ||
9ac404c5 AS |
6140 | if (use_bdrv_whitelist && |
6141 | !bdrv_format_is_whitelisted(format_name, read_only)) { | |
6142 | continue; | |
6143 | } | |
6144 | ||
eb0df69f HR |
6145 | while (formats && j && !found) { |
6146 | found = !strcmp(formats[--j], format_name); | |
6147 | } | |
6148 | ||
6149 | if (!found) { | |
6150 | formats = g_renew(const char *, formats, count + 1); | |
6151 | formats[count++] = format_name; | |
6152 | } | |
6153 | } | |
6154 | } | |
6155 | ||
61007b31 | 6156 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
40b4f539 | 6157 | |
61007b31 SH |
6158 | for (i = 0; i < count; i++) { |
6159 | it(opaque, formats[i]); | |
6160 | } | |
40b4f539 | 6161 | |
61007b31 SH |
6162 | g_free(formats); |
6163 | } | |
40b4f539 | 6164 | |
61007b31 SH |
6165 | /* This function is to find a node in the bs graph */ |
6166 | BlockDriverState *bdrv_find_node(const char *node_name) | |
6167 | { | |
6168 | BlockDriverState *bs; | |
391827eb | 6169 | |
61007b31 | 6170 | assert(node_name); |
f791bf7f | 6171 | GLOBAL_STATE_CODE(); |
40b4f539 | 6172 | |
61007b31 SH |
6173 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
6174 | if (!strcmp(node_name, bs->node_name)) { | |
6175 | return bs; | |
40b4f539 KW |
6176 | } |
6177 | } | |
61007b31 | 6178 | return NULL; |
40b4f539 KW |
6179 | } |
6180 | ||
61007b31 | 6181 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
facda544 PK |
6182 | BlockDeviceInfoList *bdrv_named_nodes_list(bool flat, |
6183 | Error **errp) | |
40b4f539 | 6184 | { |
9812e712 | 6185 | BlockDeviceInfoList *list; |
61007b31 | 6186 | BlockDriverState *bs; |
40b4f539 | 6187 | |
f791bf7f | 6188 | GLOBAL_STATE_CODE(); |
b7cfc7d5 | 6189 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f791bf7f | 6190 | |
61007b31 SH |
6191 | list = NULL; |
6192 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
facda544 | 6193 | BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, flat, errp); |
61007b31 SH |
6194 | if (!info) { |
6195 | qapi_free_BlockDeviceInfoList(list); | |
6196 | return NULL; | |
301db7c2 | 6197 | } |
9812e712 | 6198 | QAPI_LIST_PREPEND(list, info); |
301db7c2 RH |
6199 | } |
6200 | ||
61007b31 SH |
6201 | return list; |
6202 | } | |
40b4f539 | 6203 | |
5d3b4e99 VSO |
6204 | typedef struct XDbgBlockGraphConstructor { |
6205 | XDbgBlockGraph *graph; | |
6206 | GHashTable *graph_nodes; | |
6207 | } XDbgBlockGraphConstructor; | |
6208 | ||
6209 | static XDbgBlockGraphConstructor *xdbg_graph_new(void) | |
6210 | { | |
6211 | XDbgBlockGraphConstructor *gr = g_new(XDbgBlockGraphConstructor, 1); | |
6212 | ||
6213 | gr->graph = g_new0(XDbgBlockGraph, 1); | |
6214 | gr->graph_nodes = g_hash_table_new(NULL, NULL); | |
6215 | ||
6216 | return gr; | |
6217 | } | |
6218 | ||
6219 | static XDbgBlockGraph *xdbg_graph_finalize(XDbgBlockGraphConstructor *gr) | |
6220 | { | |
6221 | XDbgBlockGraph *graph = gr->graph; | |
6222 | ||
6223 | g_hash_table_destroy(gr->graph_nodes); | |
6224 | g_free(gr); | |
6225 | ||
6226 | return graph; | |
6227 | } | |
6228 | ||
6229 | static uintptr_t xdbg_graph_node_num(XDbgBlockGraphConstructor *gr, void *node) | |
6230 | { | |
6231 | uintptr_t ret = (uintptr_t)g_hash_table_lookup(gr->graph_nodes, node); | |
6232 | ||
6233 | if (ret != 0) { | |
6234 | return ret; | |
6235 | } | |
6236 | ||
6237 | /* | |
6238 | * Start counting from 1, not 0, because 0 interferes with not-found (NULL) | |
6239 | * answer of g_hash_table_lookup. | |
6240 | */ | |
6241 | ret = g_hash_table_size(gr->graph_nodes) + 1; | |
6242 | g_hash_table_insert(gr->graph_nodes, node, (void *)ret); | |
6243 | ||
6244 | return ret; | |
6245 | } | |
6246 | ||
6247 | static void xdbg_graph_add_node(XDbgBlockGraphConstructor *gr, void *node, | |
6248 | XDbgBlockGraphNodeType type, const char *name) | |
6249 | { | |
6250 | XDbgBlockGraphNode *n; | |
6251 | ||
6252 | n = g_new0(XDbgBlockGraphNode, 1); | |
6253 | ||
6254 | n->id = xdbg_graph_node_num(gr, node); | |
6255 | n->type = type; | |
6256 | n->name = g_strdup(name); | |
6257 | ||
9812e712 | 6258 | QAPI_LIST_PREPEND(gr->graph->nodes, n); |
5d3b4e99 VSO |
6259 | } |
6260 | ||
6261 | static void xdbg_graph_add_edge(XDbgBlockGraphConstructor *gr, void *parent, | |
6262 | const BdrvChild *child) | |
6263 | { | |
cdb1cec8 | 6264 | BlockPermission qapi_perm; |
5d3b4e99 | 6265 | XDbgBlockGraphEdge *edge; |
862fded9 | 6266 | GLOBAL_STATE_CODE(); |
5d3b4e99 | 6267 | |
5d3b4e99 VSO |
6268 | edge = g_new0(XDbgBlockGraphEdge, 1); |
6269 | ||
6270 | edge->parent = xdbg_graph_node_num(gr, parent); | |
6271 | edge->child = xdbg_graph_node_num(gr, child->bs); | |
6272 | edge->name = g_strdup(child->name); | |
6273 | ||
cdb1cec8 HR |
6274 | for (qapi_perm = 0; qapi_perm < BLOCK_PERMISSION__MAX; qapi_perm++) { |
6275 | uint64_t flag = bdrv_qapi_perm_to_blk_perm(qapi_perm); | |
6276 | ||
6277 | if (flag & child->perm) { | |
9812e712 | 6278 | QAPI_LIST_PREPEND(edge->perm, qapi_perm); |
5d3b4e99 | 6279 | } |
cdb1cec8 | 6280 | if (flag & child->shared_perm) { |
9812e712 | 6281 | QAPI_LIST_PREPEND(edge->shared_perm, qapi_perm); |
5d3b4e99 VSO |
6282 | } |
6283 | } | |
6284 | ||
9812e712 | 6285 | QAPI_LIST_PREPEND(gr->graph->edges, edge); |
5d3b4e99 VSO |
6286 | } |
6287 | ||
6288 | ||
6289 | XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp) | |
6290 | { | |
6291 | BlockBackend *blk; | |
6292 | BlockJob *job; | |
6293 | BlockDriverState *bs; | |
6294 | BdrvChild *child; | |
6295 | XDbgBlockGraphConstructor *gr = xdbg_graph_new(); | |
6296 | ||
f791bf7f EGE |
6297 | GLOBAL_STATE_CODE(); |
6298 | ||
5d3b4e99 VSO |
6299 | for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) { |
6300 | char *allocated_name = NULL; | |
6301 | const char *name = blk_name(blk); | |
6302 | ||
6303 | if (!*name) { | |
6304 | name = allocated_name = blk_get_attached_dev_id(blk); | |
6305 | } | |
6306 | xdbg_graph_add_node(gr, blk, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_BACKEND, | |
6307 | name); | |
6308 | g_free(allocated_name); | |
6309 | if (blk_root(blk)) { | |
6310 | xdbg_graph_add_edge(gr, blk, blk_root(blk)); | |
6311 | } | |
6312 | } | |
6313 | ||
880eeec6 EGE |
6314 | WITH_JOB_LOCK_GUARD() { |
6315 | for (job = block_job_next_locked(NULL); job; | |
6316 | job = block_job_next_locked(job)) { | |
6317 | GSList *el; | |
5d3b4e99 | 6318 | |
880eeec6 EGE |
6319 | xdbg_graph_add_node(gr, job, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_JOB, |
6320 | job->job.id); | |
6321 | for (el = job->nodes; el; el = el->next) { | |
6322 | xdbg_graph_add_edge(gr, job, (BdrvChild *)el->data); | |
6323 | } | |
5d3b4e99 VSO |
6324 | } |
6325 | } | |
6326 | ||
6327 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
6328 | xdbg_graph_add_node(gr, bs, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_DRIVER, | |
6329 | bs->node_name); | |
6330 | QLIST_FOREACH(child, &bs->children, next) { | |
6331 | xdbg_graph_add_edge(gr, bs, child); | |
6332 | } | |
6333 | } | |
6334 | ||
6335 | return xdbg_graph_finalize(gr); | |
6336 | } | |
6337 | ||
61007b31 SH |
6338 | BlockDriverState *bdrv_lookup_bs(const char *device, |
6339 | const char *node_name, | |
6340 | Error **errp) | |
6341 | { | |
6342 | BlockBackend *blk; | |
6343 | BlockDriverState *bs; | |
40b4f539 | 6344 | |
f791bf7f EGE |
6345 | GLOBAL_STATE_CODE(); |
6346 | ||
61007b31 SH |
6347 | if (device) { |
6348 | blk = blk_by_name(device); | |
40b4f539 | 6349 | |
61007b31 | 6350 | if (blk) { |
9f4ed6fb AG |
6351 | bs = blk_bs(blk); |
6352 | if (!bs) { | |
5433c24f | 6353 | error_setg(errp, "Device '%s' has no medium", device); |
5433c24f HR |
6354 | } |
6355 | ||
9f4ed6fb | 6356 | return bs; |
61007b31 SH |
6357 | } |
6358 | } | |
40b4f539 | 6359 | |
61007b31 SH |
6360 | if (node_name) { |
6361 | bs = bdrv_find_node(node_name); | |
6d519a5f | 6362 | |
61007b31 SH |
6363 | if (bs) { |
6364 | return bs; | |
6365 | } | |
40b4f539 KW |
6366 | } |
6367 | ||
785ec4b1 | 6368 | error_setg(errp, "Cannot find device=\'%s\' nor node-name=\'%s\'", |
61007b31 SH |
6369 | device ? device : "", |
6370 | node_name ? node_name : ""); | |
6371 | return NULL; | |
40b4f539 KW |
6372 | } |
6373 | ||
61007b31 SH |
6374 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
6375 | * return false. If either argument is NULL, return false. */ | |
6376 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) | |
83f64091 | 6377 | { |
f791bf7f EGE |
6378 | |
6379 | GLOBAL_STATE_CODE(); | |
6380 | ||
61007b31 | 6381 | while (top && top != base) { |
dcf3f9b2 | 6382 | top = bdrv_filter_or_cow_bs(top); |
02c50efe | 6383 | } |
61007b31 SH |
6384 | |
6385 | return top != NULL; | |
02c50efe FZ |
6386 | } |
6387 | ||
61007b31 | 6388 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
02c50efe | 6389 | { |
f791bf7f | 6390 | GLOBAL_STATE_CODE(); |
61007b31 SH |
6391 | if (!bs) { |
6392 | return QTAILQ_FIRST(&graph_bdrv_states); | |
02c50efe | 6393 | } |
61007b31 | 6394 | return QTAILQ_NEXT(bs, node_list); |
83f64091 FB |
6395 | } |
6396 | ||
0f12264e KW |
6397 | BlockDriverState *bdrv_next_all_states(BlockDriverState *bs) |
6398 | { | |
f791bf7f | 6399 | GLOBAL_STATE_CODE(); |
0f12264e KW |
6400 | if (!bs) { |
6401 | return QTAILQ_FIRST(&all_bdrv_states); | |
6402 | } | |
6403 | return QTAILQ_NEXT(bs, bs_list); | |
6404 | } | |
6405 | ||
61007b31 | 6406 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
83f64091 | 6407 | { |
384a48fb | 6408 | IO_CODE(); |
61007b31 | 6409 | return bs->node_name; |
beac80cd FB |
6410 | } |
6411 | ||
1f0c461b | 6412 | const char *bdrv_get_parent_name(const BlockDriverState *bs) |
4c265bf9 KW |
6413 | { |
6414 | BdrvChild *c; | |
6415 | const char *name; | |
967d7905 | 6416 | IO_CODE(); |
4c265bf9 KW |
6417 | |
6418 | /* If multiple parents have a name, just pick the first one. */ | |
6419 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
bd86fb99 HR |
6420 | if (c->klass->get_name) { |
6421 | name = c->klass->get_name(c); | |
4c265bf9 KW |
6422 | if (name && *name) { |
6423 | return name; | |
6424 | } | |
6425 | } | |
6426 | } | |
6427 | ||
6428 | return NULL; | |
6429 | } | |
6430 | ||
61007b31 SH |
6431 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
6432 | const char *bdrv_get_device_name(const BlockDriverState *bs) | |
beac80cd | 6433 | { |
384a48fb | 6434 | IO_CODE(); |
4c265bf9 | 6435 | return bdrv_get_parent_name(bs) ?: ""; |
f141eafe | 6436 | } |
83f64091 | 6437 | |
61007b31 SH |
6438 | /* This can be used to identify nodes that might not have a device |
6439 | * name associated. Since node and device names live in the same | |
6440 | * namespace, the result is unambiguous. The exception is if both are | |
6441 | * absent, then this returns an empty (non-null) string. */ | |
6442 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) | |
f141eafe | 6443 | { |
384a48fb | 6444 | IO_CODE(); |
4c265bf9 | 6445 | return bdrv_get_parent_name(bs) ?: bs->node_name; |
beac80cd | 6446 | } |
beac80cd | 6447 | |
61007b31 | 6448 | int bdrv_get_flags(BlockDriverState *bs) |
0b5a2445 | 6449 | { |
15aee7ac | 6450 | IO_CODE(); |
61007b31 | 6451 | return bs->open_flags; |
0b5a2445 PB |
6452 | } |
6453 | ||
61007b31 | 6454 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
68485420 | 6455 | { |
f791bf7f | 6456 | GLOBAL_STATE_CODE(); |
61007b31 | 6457 | return 1; |
0b5a2445 PB |
6458 | } |
6459 | ||
06717986 | 6460 | int coroutine_mixed_fn bdrv_has_zero_init(BlockDriverState *bs) |
0b5a2445 | 6461 | { |
93393e69 | 6462 | BlockDriverState *filtered; |
f791bf7f | 6463 | GLOBAL_STATE_CODE(); |
93393e69 | 6464 | |
d470ad42 HR |
6465 | if (!bs->drv) { |
6466 | return 0; | |
6467 | } | |
0b5a2445 | 6468 | |
61007b31 SH |
6469 | /* If BS is a copy on write image, it is initialized to |
6470 | the contents of the base image, which may not be zeroes. */ | |
34778172 | 6471 | if (bdrv_cow_child(bs)) { |
61007b31 SH |
6472 | return 0; |
6473 | } | |
6474 | if (bs->drv->bdrv_has_zero_init) { | |
6475 | return bs->drv->bdrv_has_zero_init(bs); | |
0b5a2445 | 6476 | } |
93393e69 HR |
6477 | |
6478 | filtered = bdrv_filter_bs(bs); | |
6479 | if (filtered) { | |
6480 | return bdrv_has_zero_init(filtered); | |
5a612c00 | 6481 | } |
61007b31 SH |
6482 | |
6483 | /* safe default */ | |
6484 | return 0; | |
68485420 KW |
6485 | } |
6486 | ||
61007b31 | 6487 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
68485420 | 6488 | { |
384a48fb | 6489 | IO_CODE(); |
2f0342ef | 6490 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
61007b31 SH |
6491 | return false; |
6492 | } | |
68485420 | 6493 | |
e24d813b | 6494 | return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP; |
68485420 KW |
6495 | } |
6496 | ||
61007b31 SH |
6497 | void bdrv_get_backing_filename(BlockDriverState *bs, |
6498 | char *filename, int filename_size) | |
016f5cf6 | 6499 | { |
384a48fb | 6500 | IO_CODE(); |
61007b31 SH |
6501 | pstrcpy(filename, filename_size, bs->backing_file); |
6502 | } | |
d318aea9 | 6503 | |
3d47eb0a | 6504 | int coroutine_fn bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
61007b31 | 6505 | { |
8b117001 | 6506 | int ret; |
61007b31 | 6507 | BlockDriver *drv = bs->drv; |
384a48fb | 6508 | IO_CODE(); |
a00e70c0 EGE |
6509 | assert_bdrv_graph_readable(); |
6510 | ||
5a612c00 MP |
6511 | /* if bs->drv == NULL, bs is closed, so there's nothing to do here */ |
6512 | if (!drv) { | |
61007b31 | 6513 | return -ENOMEDIUM; |
5a612c00 | 6514 | } |
3d47eb0a | 6515 | if (!drv->bdrv_co_get_info) { |
93393e69 HR |
6516 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
6517 | if (filtered) { | |
3d47eb0a | 6518 | return bdrv_co_get_info(filtered, bdi); |
5a612c00 | 6519 | } |
61007b31 | 6520 | return -ENOTSUP; |
5a612c00 | 6521 | } |
61007b31 | 6522 | memset(bdi, 0, sizeof(*bdi)); |
3d47eb0a | 6523 | ret = drv->bdrv_co_get_info(bs, bdi); |
c54483b6 AD |
6524 | if (bdi->subcluster_size == 0) { |
6525 | /* | |
6526 | * If the driver left this unset, subclusters are not supported. | |
6527 | * Then it is safe to treat each cluster as having only one subcluster. | |
6528 | */ | |
6529 | bdi->subcluster_size = bdi->cluster_size; | |
6530 | } | |
8b117001 VSO |
6531 | if (ret < 0) { |
6532 | return ret; | |
6533 | } | |
6534 | ||
6535 | if (bdi->cluster_size > BDRV_MAX_ALIGNMENT) { | |
6536 | return -EINVAL; | |
6537 | } | |
6538 | ||
6539 | return 0; | |
61007b31 | 6540 | } |
016f5cf6 | 6541 | |
1bf6e9ca AS |
6542 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
6543 | Error **errp) | |
61007b31 SH |
6544 | { |
6545 | BlockDriver *drv = bs->drv; | |
384a48fb | 6546 | IO_CODE(); |
61007b31 | 6547 | if (drv && drv->bdrv_get_specific_info) { |
1bf6e9ca | 6548 | return drv->bdrv_get_specific_info(bs, errp); |
61007b31 SH |
6549 | } |
6550 | return NULL; | |
016f5cf6 AG |
6551 | } |
6552 | ||
d9245599 AN |
6553 | BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs) |
6554 | { | |
6555 | BlockDriver *drv = bs->drv; | |
384a48fb | 6556 | IO_CODE(); |
d9245599 AN |
6557 | if (!drv || !drv->bdrv_get_specific_stats) { |
6558 | return NULL; | |
6559 | } | |
6560 | return drv->bdrv_get_specific_stats(bs); | |
6561 | } | |
6562 | ||
c834dc05 | 6563 | void coroutine_fn bdrv_co_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
4265d620 | 6564 | { |
384a48fb | 6565 | IO_CODE(); |
cb2bfaa4 EGE |
6566 | assert_bdrv_graph_readable(); |
6567 | ||
c834dc05 | 6568 | if (!bs || !bs->drv || !bs->drv->bdrv_co_debug_event) { |
61007b31 SH |
6569 | return; |
6570 | } | |
4265d620 | 6571 | |
c834dc05 | 6572 | bs->drv->bdrv_co_debug_event(bs, event); |
4265d620 PB |
6573 | } |
6574 | ||
c0fc5123 KW |
6575 | static BlockDriverState * GRAPH_RDLOCK |
6576 | bdrv_find_debug_node(BlockDriverState *bs) | |
4265d620 | 6577 | { |
bdb73476 | 6578 | GLOBAL_STATE_CODE(); |
61007b31 | 6579 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
f706a92f | 6580 | bs = bdrv_primary_bs(bs); |
61007b31 | 6581 | } |
4265d620 | 6582 | |
61007b31 | 6583 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
d10529a2 VSO |
6584 | assert(bs->drv->bdrv_debug_remove_breakpoint); |
6585 | return bs; | |
6586 | } | |
6587 | ||
6588 | return NULL; | |
6589 | } | |
6590 | ||
6591 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
6592 | const char *tag) | |
6593 | { | |
f791bf7f | 6594 | GLOBAL_STATE_CODE(); |
c0fc5123 KW |
6595 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
6596 | ||
d10529a2 VSO |
6597 | bs = bdrv_find_debug_node(bs); |
6598 | if (bs) { | |
61007b31 SH |
6599 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
6600 | } | |
4265d620 | 6601 | |
61007b31 | 6602 | return -ENOTSUP; |
4265d620 PB |
6603 | } |
6604 | ||
61007b31 | 6605 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
ea2384d3 | 6606 | { |
f791bf7f | 6607 | GLOBAL_STATE_CODE(); |
c0fc5123 KW |
6608 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
6609 | ||
d10529a2 VSO |
6610 | bs = bdrv_find_debug_node(bs); |
6611 | if (bs) { | |
61007b31 SH |
6612 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
6613 | } | |
6614 | ||
6615 | return -ENOTSUP; | |
eb852011 MA |
6616 | } |
6617 | ||
61007b31 | 6618 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
ce1a14dc | 6619 | { |
f791bf7f | 6620 | GLOBAL_STATE_CODE(); |
c0fc5123 KW |
6621 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
6622 | ||
61007b31 | 6623 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
f706a92f | 6624 | bs = bdrv_primary_bs(bs); |
61007b31 | 6625 | } |
ce1a14dc | 6626 | |
61007b31 SH |
6627 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
6628 | return bs->drv->bdrv_debug_resume(bs, tag); | |
6629 | } | |
ce1a14dc | 6630 | |
61007b31 | 6631 | return -ENOTSUP; |
f197fe2b FZ |
6632 | } |
6633 | ||
61007b31 | 6634 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
ce1a14dc | 6635 | { |
f791bf7f | 6636 | GLOBAL_STATE_CODE(); |
c0fc5123 KW |
6637 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
6638 | ||
61007b31 | 6639 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
f706a92f | 6640 | bs = bdrv_primary_bs(bs); |
f197fe2b | 6641 | } |
19cb3738 | 6642 | |
61007b31 SH |
6643 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
6644 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
6645 | } | |
f9f05dc5 | 6646 | |
61007b31 SH |
6647 | return false; |
6648 | } | |
f9f05dc5 | 6649 | |
61007b31 SH |
6650 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
6651 | * relative, it must be relative to the chain. So, passing in bs->filename | |
6652 | * from a BDS as backing_file should not be done, as that may be relative to | |
6653 | * the CWD rather than the chain. */ | |
6654 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, | |
6655 | const char *backing_file) | |
f9f05dc5 | 6656 | { |
61007b31 SH |
6657 | char *filename_full = NULL; |
6658 | char *backing_file_full = NULL; | |
6659 | char *filename_tmp = NULL; | |
6660 | int is_protocol = 0; | |
0b877d09 | 6661 | bool filenames_refreshed = false; |
61007b31 SH |
6662 | BlockDriverState *curr_bs = NULL; |
6663 | BlockDriverState *retval = NULL; | |
dcf3f9b2 | 6664 | BlockDriverState *bs_below; |
f9f05dc5 | 6665 | |
f791bf7f | 6666 | GLOBAL_STATE_CODE(); |
b7cfc7d5 | 6667 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f791bf7f | 6668 | |
61007b31 SH |
6669 | if (!bs || !bs->drv || !backing_file) { |
6670 | return NULL; | |
f9f05dc5 KW |
6671 | } |
6672 | ||
61007b31 SH |
6673 | filename_full = g_malloc(PATH_MAX); |
6674 | backing_file_full = g_malloc(PATH_MAX); | |
f9f05dc5 | 6675 | |
61007b31 | 6676 | is_protocol = path_has_protocol(backing_file); |
f9f05dc5 | 6677 | |
dcf3f9b2 HR |
6678 | /* |
6679 | * Being largely a legacy function, skip any filters here | |
6680 | * (because filters do not have normal filenames, so they cannot | |
6681 | * match anyway; and allowing json:{} filenames is a bit out of | |
6682 | * scope). | |
6683 | */ | |
6684 | for (curr_bs = bdrv_skip_filters(bs); | |
6685 | bdrv_cow_child(curr_bs) != NULL; | |
6686 | curr_bs = bs_below) | |
6687 | { | |
6688 | bs_below = bdrv_backing_chain_next(curr_bs); | |
f9f05dc5 | 6689 | |
0b877d09 HR |
6690 | if (bdrv_backing_overridden(curr_bs)) { |
6691 | /* | |
6692 | * If the backing file was overridden, we can only compare | |
6693 | * directly against the backing node's filename. | |
6694 | */ | |
6695 | ||
6696 | if (!filenames_refreshed) { | |
6697 | /* | |
6698 | * This will automatically refresh all of the | |
6699 | * filenames in the rest of the backing chain, so we | |
6700 | * only need to do this once. | |
6701 | */ | |
6702 | bdrv_refresh_filename(bs_below); | |
6703 | filenames_refreshed = true; | |
6704 | } | |
6705 | ||
6706 | if (strcmp(backing_file, bs_below->filename) == 0) { | |
6707 | retval = bs_below; | |
6708 | break; | |
6709 | } | |
6710 | } else if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
6711 | /* | |
6712 | * If either of the filename paths is actually a protocol, then | |
6713 | * compare unmodified paths; otherwise make paths relative. | |
6714 | */ | |
6b6833c1 HR |
6715 | char *backing_file_full_ret; |
6716 | ||
61007b31 | 6717 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
dcf3f9b2 | 6718 | retval = bs_below; |
61007b31 SH |
6719 | break; |
6720 | } | |
418661e0 | 6721 | /* Also check against the full backing filename for the image */ |
6b6833c1 HR |
6722 | backing_file_full_ret = bdrv_get_full_backing_filename(curr_bs, |
6723 | NULL); | |
6724 | if (backing_file_full_ret) { | |
6725 | bool equal = strcmp(backing_file, backing_file_full_ret) == 0; | |
6726 | g_free(backing_file_full_ret); | |
6727 | if (equal) { | |
dcf3f9b2 | 6728 | retval = bs_below; |
418661e0 JC |
6729 | break; |
6730 | } | |
418661e0 | 6731 | } |
61007b31 SH |
6732 | } else { |
6733 | /* If not an absolute filename path, make it relative to the current | |
6734 | * image's filename path */ | |
2d9158ce HR |
6735 | filename_tmp = bdrv_make_absolute_filename(curr_bs, backing_file, |
6736 | NULL); | |
6737 | /* We are going to compare canonicalized absolute pathnames */ | |
6738 | if (!filename_tmp || !realpath(filename_tmp, filename_full)) { | |
6739 | g_free(filename_tmp); | |
61007b31 SH |
6740 | continue; |
6741 | } | |
2d9158ce | 6742 | g_free(filename_tmp); |
07f07615 | 6743 | |
61007b31 SH |
6744 | /* We need to make sure the backing filename we are comparing against |
6745 | * is relative to the current image filename (or absolute) */ | |
2d9158ce HR |
6746 | filename_tmp = bdrv_get_full_backing_filename(curr_bs, NULL); |
6747 | if (!filename_tmp || !realpath(filename_tmp, backing_file_full)) { | |
6748 | g_free(filename_tmp); | |
61007b31 SH |
6749 | continue; |
6750 | } | |
2d9158ce | 6751 | g_free(filename_tmp); |
eb489bb1 | 6752 | |
61007b31 | 6753 | if (strcmp(backing_file_full, filename_full) == 0) { |
dcf3f9b2 | 6754 | retval = bs_below; |
61007b31 SH |
6755 | break; |
6756 | } | |
6757 | } | |
eb489bb1 KW |
6758 | } |
6759 | ||
61007b31 SH |
6760 | g_free(filename_full); |
6761 | g_free(backing_file_full); | |
61007b31 SH |
6762 | return retval; |
6763 | } | |
6764 | ||
61007b31 SH |
6765 | void bdrv_init(void) |
6766 | { | |
e5f05f8c KW |
6767 | #ifdef CONFIG_BDRV_WHITELIST_TOOLS |
6768 | use_bdrv_whitelist = 1; | |
6769 | #endif | |
61007b31 SH |
6770 | module_call_init(MODULE_INIT_BLOCK); |
6771 | } | |
29cdb251 | 6772 | |
61007b31 SH |
6773 | void bdrv_init_with_whitelist(void) |
6774 | { | |
6775 | use_bdrv_whitelist = 1; | |
6776 | bdrv_init(); | |
07f07615 PB |
6777 | } |
6778 | ||
a94750d9 | 6779 | int bdrv_activate(BlockDriverState *bs, Error **errp) |
0f15423c | 6780 | { |
4417ab7a | 6781 | BdrvChild *child, *parent; |
5a8a30db KW |
6782 | Error *local_err = NULL; |
6783 | int ret; | |
9c98f145 | 6784 | BdrvDirtyBitmap *bm; |
5a8a30db | 6785 | |
f791bf7f | 6786 | GLOBAL_STATE_CODE(); |
3804e3cf | 6787 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f791bf7f | 6788 | |
3456a8d1 | 6789 | if (!bs->drv) { |
5416645f | 6790 | return -ENOMEDIUM; |
3456a8d1 KW |
6791 | } |
6792 | ||
16e977d5 | 6793 | QLIST_FOREACH(child, &bs->children, next) { |
11d0c9b3 | 6794 | bdrv_activate(child->bs, &local_err); |
0d1c5c91 | 6795 | if (local_err) { |
0d1c5c91 | 6796 | error_propagate(errp, local_err); |
5416645f | 6797 | return -EINVAL; |
0d1c5c91 | 6798 | } |
5a8a30db | 6799 | } |
0d1c5c91 | 6800 | |
dafe0960 KW |
6801 | /* |
6802 | * Update permissions, they may differ for inactive nodes. | |
6803 | * | |
6804 | * Note that the required permissions of inactive images are always a | |
6805 | * subset of the permissions required after activating the image. This | |
6806 | * allows us to just get the permissions upfront without restricting | |
11d0c9b3 | 6807 | * bdrv_co_invalidate_cache(). |
dafe0960 KW |
6808 | * |
6809 | * It also means that in error cases, we don't have to try and revert to | |
6810 | * the old permissions (which is an operation that could fail, too). We can | |
6811 | * just keep the extended permissions for the next time that an activation | |
6812 | * of the image is tried. | |
6813 | */ | |
7bb4941a KW |
6814 | if (bs->open_flags & BDRV_O_INACTIVE) { |
6815 | bs->open_flags &= ~BDRV_O_INACTIVE; | |
f1316edb | 6816 | ret = bdrv_refresh_perms(bs, NULL, errp); |
7bb4941a | 6817 | if (ret < 0) { |
0d1c5c91 | 6818 | bs->open_flags |= BDRV_O_INACTIVE; |
5416645f | 6819 | return ret; |
0d1c5c91 | 6820 | } |
3456a8d1 | 6821 | |
11d0c9b3 EGE |
6822 | ret = bdrv_invalidate_cache(bs, errp); |
6823 | if (ret < 0) { | |
6824 | bs->open_flags |= BDRV_O_INACTIVE; | |
6825 | return ret; | |
7bb4941a | 6826 | } |
9c98f145 | 6827 | |
7bb4941a KW |
6828 | FOR_EACH_DIRTY_BITMAP(bs, bm) { |
6829 | bdrv_dirty_bitmap_skip_store(bm, false); | |
6830 | } | |
6831 | ||
c057960c | 6832 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
7bb4941a KW |
6833 | if (ret < 0) { |
6834 | bs->open_flags |= BDRV_O_INACTIVE; | |
6835 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
5416645f | 6836 | return ret; |
7bb4941a | 6837 | } |
5a8a30db | 6838 | } |
4417ab7a KW |
6839 | |
6840 | QLIST_FOREACH(parent, &bs->parents, next_parent) { | |
bd86fb99 HR |
6841 | if (parent->klass->activate) { |
6842 | parent->klass->activate(parent, &local_err); | |
4417ab7a | 6843 | if (local_err) { |
78fc3b3a | 6844 | bs->open_flags |= BDRV_O_INACTIVE; |
4417ab7a | 6845 | error_propagate(errp, local_err); |
5416645f | 6846 | return -EINVAL; |
4417ab7a KW |
6847 | } |
6848 | } | |
6849 | } | |
5416645f VSO |
6850 | |
6851 | return 0; | |
0f15423c AL |
6852 | } |
6853 | ||
11d0c9b3 EGE |
6854 | int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp) |
6855 | { | |
6856 | Error *local_err = NULL; | |
1581a70d | 6857 | IO_CODE(); |
11d0c9b3 EGE |
6858 | |
6859 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); | |
1b3ff9fe | 6860 | assert_bdrv_graph_readable(); |
11d0c9b3 EGE |
6861 | |
6862 | if (bs->drv->bdrv_co_invalidate_cache) { | |
6863 | bs->drv->bdrv_co_invalidate_cache(bs, &local_err); | |
6864 | if (local_err) { | |
6865 | error_propagate(errp, local_err); | |
6866 | return -EINVAL; | |
6867 | } | |
6868 | } | |
6869 | ||
6870 | return 0; | |
6871 | } | |
6872 | ||
3b717194 | 6873 | void bdrv_activate_all(Error **errp) |
0f15423c | 6874 | { |
7c8eece4 | 6875 | BlockDriverState *bs; |
88be7b4b | 6876 | BdrvNextIterator it; |
0f15423c | 6877 | |
f791bf7f | 6878 | GLOBAL_STATE_CODE(); |
2b3912f1 | 6879 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f791bf7f | 6880 | |
88be7b4b | 6881 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
5416645f | 6882 | int ret; |
ed78cda3 | 6883 | |
a94750d9 | 6884 | ret = bdrv_activate(bs, errp); |
5416645f | 6885 | if (ret < 0) { |
5e003f17 | 6886 | bdrv_next_cleanup(&it); |
5a8a30db KW |
6887 | return; |
6888 | } | |
0f15423c AL |
6889 | } |
6890 | } | |
6891 | ||
0e6bad1f KW |
6892 | static bool GRAPH_RDLOCK |
6893 | bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) | |
9e37271f KW |
6894 | { |
6895 | BdrvChild *parent; | |
bdb73476 | 6896 | GLOBAL_STATE_CODE(); |
9e37271f KW |
6897 | |
6898 | QLIST_FOREACH(parent, &bs->parents, next_parent) { | |
bd86fb99 | 6899 | if (parent->klass->parent_is_bds) { |
9e37271f KW |
6900 | BlockDriverState *parent_bs = parent->opaque; |
6901 | if (!only_active || !(parent_bs->open_flags & BDRV_O_INACTIVE)) { | |
6902 | return true; | |
6903 | } | |
6904 | } | |
6905 | } | |
6906 | ||
6907 | return false; | |
6908 | } | |
6909 | ||
0e6bad1f | 6910 | static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) |
76b1c7fe | 6911 | { |
cfa1a572 | 6912 | BdrvChild *child, *parent; |
76b1c7fe | 6913 | int ret; |
a13de40a | 6914 | uint64_t cumulative_perms, cumulative_shared_perms; |
76b1c7fe | 6915 | |
da359909 EGE |
6916 | GLOBAL_STATE_CODE(); |
6917 | ||
d470ad42 HR |
6918 | if (!bs->drv) { |
6919 | return -ENOMEDIUM; | |
6920 | } | |
6921 | ||
9e37271f KW |
6922 | /* Make sure that we don't inactivate a child before its parent. |
6923 | * It will be covered by recursion from the yet active parent. */ | |
6924 | if (bdrv_has_bds_parent(bs, true)) { | |
6925 | return 0; | |
6926 | } | |
6927 | ||
6928 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); | |
6929 | ||
6930 | /* Inactivate this node */ | |
6931 | if (bs->drv->bdrv_inactivate) { | |
76b1c7fe KW |
6932 | ret = bs->drv->bdrv_inactivate(bs); |
6933 | if (ret < 0) { | |
6934 | return ret; | |
6935 | } | |
6936 | } | |
6937 | ||
9e37271f | 6938 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
bd86fb99 HR |
6939 | if (parent->klass->inactivate) { |
6940 | ret = parent->klass->inactivate(parent); | |
9e37271f KW |
6941 | if (ret < 0) { |
6942 | return ret; | |
cfa1a572 KW |
6943 | } |
6944 | } | |
9e37271f | 6945 | } |
9c5e6594 | 6946 | |
a13de40a VSO |
6947 | bdrv_get_cumulative_perm(bs, &cumulative_perms, |
6948 | &cumulative_shared_perms); | |
6949 | if (cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) { | |
6950 | /* Our inactive parents still need write access. Inactivation failed. */ | |
6951 | return -EPERM; | |
6952 | } | |
6953 | ||
9e37271f | 6954 | bs->open_flags |= BDRV_O_INACTIVE; |
7d5b5261 | 6955 | |
bb87e4d1 VSO |
6956 | /* |
6957 | * Update permissions, they may differ for inactive nodes. | |
6958 | * We only tried to loosen restrictions, so errors are not fatal, ignore | |
6959 | * them. | |
6960 | */ | |
f1316edb | 6961 | bdrv_refresh_perms(bs, NULL, NULL); |
9e37271f KW |
6962 | |
6963 | /* Recursively inactivate children */ | |
38701b6a | 6964 | QLIST_FOREACH(child, &bs->children, next) { |
9e37271f | 6965 | ret = bdrv_inactivate_recurse(child->bs); |
38701b6a KW |
6966 | if (ret < 0) { |
6967 | return ret; | |
6968 | } | |
6969 | } | |
6970 | ||
76b1c7fe KW |
6971 | return 0; |
6972 | } | |
6973 | ||
6974 | int bdrv_inactivate_all(void) | |
6975 | { | |
79720af6 | 6976 | BlockDriverState *bs = NULL; |
88be7b4b | 6977 | BdrvNextIterator it; |
aad0b7a0 | 6978 | int ret = 0; |
76b1c7fe | 6979 | |
f791bf7f | 6980 | GLOBAL_STATE_CODE(); |
0e6bad1f | 6981 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f791bf7f | 6982 | |
9e37271f KW |
6983 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
6984 | /* Nodes with BDS parents are covered by recursion from the last | |
6985 | * parent that gets inactivated. Don't inactivate them a second | |
6986 | * time if that has already happened. */ | |
6987 | if (bdrv_has_bds_parent(bs, false)) { | |
6988 | continue; | |
6989 | } | |
6990 | ret = bdrv_inactivate_recurse(bs); | |
6991 | if (ret < 0) { | |
6992 | bdrv_next_cleanup(&it); | |
b49f4755 | 6993 | break; |
76b1c7fe KW |
6994 | } |
6995 | } | |
6996 | ||
aad0b7a0 | 6997 | return ret; |
76b1c7fe KW |
6998 | } |
6999 | ||
19cb3738 FB |
7000 | /**************************************************************/ |
7001 | /* removable device support */ | |
7002 | ||
7003 | /** | |
7004 | * Return TRUE if the media is present | |
7005 | */ | |
1e97be91 | 7006 | bool coroutine_fn bdrv_co_is_inserted(BlockDriverState *bs) |
19cb3738 FB |
7007 | { |
7008 | BlockDriver *drv = bs->drv; | |
28d7a789 | 7009 | BdrvChild *child; |
384a48fb | 7010 | IO_CODE(); |
c73ff92c | 7011 | assert_bdrv_graph_readable(); |
a1aff5bf | 7012 | |
e031f750 HR |
7013 | if (!drv) { |
7014 | return false; | |
7015 | } | |
1e97be91 EGE |
7016 | if (drv->bdrv_co_is_inserted) { |
7017 | return drv->bdrv_co_is_inserted(bs); | |
28d7a789 HR |
7018 | } |
7019 | QLIST_FOREACH(child, &bs->children, next) { | |
1e97be91 | 7020 | if (!bdrv_co_is_inserted(child->bs)) { |
28d7a789 HR |
7021 | return false; |
7022 | } | |
e031f750 | 7023 | } |
28d7a789 | 7024 | return true; |
19cb3738 FB |
7025 | } |
7026 | ||
19cb3738 FB |
7027 | /** |
7028 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
7029 | */ | |
2531b390 | 7030 | void coroutine_fn bdrv_co_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
7031 | { |
7032 | BlockDriver *drv = bs->drv; | |
384a48fb | 7033 | IO_CODE(); |
79a292e5 | 7034 | assert_bdrv_graph_readable(); |
19cb3738 | 7035 | |
2531b390 EGE |
7036 | if (drv && drv->bdrv_co_eject) { |
7037 | drv->bdrv_co_eject(bs, eject_flag); | |
19cb3738 FB |
7038 | } |
7039 | } | |
7040 | ||
19cb3738 FB |
7041 | /** |
7042 | * Lock or unlock the media (if it is locked, the user won't be able | |
7043 | * to eject it manually). | |
7044 | */ | |
2c75261c | 7045 | void coroutine_fn bdrv_co_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
7046 | { |
7047 | BlockDriver *drv = bs->drv; | |
384a48fb | 7048 | IO_CODE(); |
79a292e5 | 7049 | assert_bdrv_graph_readable(); |
025e849a | 7050 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 7051 | |
2c75261c EGE |
7052 | if (drv && drv->bdrv_co_lock_medium) { |
7053 | drv->bdrv_co_lock_medium(bs, locked); | |
19cb3738 FB |
7054 | } |
7055 | } | |
985a03b0 | 7056 | |
9fcb0251 FZ |
7057 | /* Get a reference to bs */ |
7058 | void bdrv_ref(BlockDriverState *bs) | |
7059 | { | |
f791bf7f | 7060 | GLOBAL_STATE_CODE(); |
9fcb0251 FZ |
7061 | bs->refcnt++; |
7062 | } | |
7063 | ||
7064 | /* Release a previously grabbed reference to bs. | |
7065 | * If after releasing, reference count is zero, the BlockDriverState is | |
7066 | * deleted. */ | |
7067 | void bdrv_unref(BlockDriverState *bs) | |
7068 | { | |
f791bf7f | 7069 | GLOBAL_STATE_CODE(); |
9a4d5ca6 JC |
7070 | if (!bs) { |
7071 | return; | |
7072 | } | |
9fcb0251 FZ |
7073 | assert(bs->refcnt > 0); |
7074 | if (--bs->refcnt == 0) { | |
7075 | bdrv_delete(bs); | |
7076 | } | |
7077 | } | |
7078 | ||
6bc0bcc8 KW |
7079 | static void bdrv_schedule_unref_bh(void *opaque) |
7080 | { | |
7081 | BlockDriverState *bs = opaque; | |
6bc0bcc8 | 7082 | |
6bc0bcc8 | 7083 | bdrv_unref(bs); |
6bc0bcc8 KW |
7084 | } |
7085 | ||
ac2ae233 KW |
7086 | /* |
7087 | * Release a BlockDriverState reference while holding the graph write lock. | |
7088 | * | |
7089 | * Calling bdrv_unref() directly is forbidden while holding the graph lock | |
7090 | * because bdrv_close() both involves polling and taking the graph lock | |
7091 | * internally. bdrv_schedule_unref() instead delays decreasing the refcount and | |
7092 | * possibly closing @bs until the graph lock is released. | |
7093 | */ | |
7094 | void bdrv_schedule_unref(BlockDriverState *bs) | |
7095 | { | |
7096 | if (!bs) { | |
7097 | return; | |
7098 | } | |
6bc0bcc8 | 7099 | aio_bh_schedule_oneshot(qemu_get_aio_context(), bdrv_schedule_unref_bh, bs); |
ac2ae233 KW |
7100 | } |
7101 | ||
fbe40ff7 FZ |
7102 | struct BdrvOpBlocker { |
7103 | Error *reason; | |
7104 | QLIST_ENTRY(BdrvOpBlocker) list; | |
7105 | }; | |
7106 | ||
7107 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) | |
7108 | { | |
7109 | BdrvOpBlocker *blocker; | |
f791bf7f | 7110 | GLOBAL_STATE_CODE(); |
0bb79c97 | 7111 | |
fbe40ff7 FZ |
7112 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
7113 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { | |
7114 | blocker = QLIST_FIRST(&bs->op_blockers[op]); | |
4b576648 MA |
7115 | error_propagate_prepend(errp, error_copy(blocker->reason), |
7116 | "Node '%s' is busy: ", | |
7117 | bdrv_get_device_or_node_name(bs)); | |
fbe40ff7 FZ |
7118 | return true; |
7119 | } | |
7120 | return false; | |
7121 | } | |
7122 | ||
7123 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) | |
7124 | { | |
7125 | BdrvOpBlocker *blocker; | |
f791bf7f | 7126 | GLOBAL_STATE_CODE(); |
fbe40ff7 FZ |
7127 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
7128 | ||
5839e53b | 7129 | blocker = g_new0(BdrvOpBlocker, 1); |
fbe40ff7 FZ |
7130 | blocker->reason = reason; |
7131 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); | |
7132 | } | |
7133 | ||
7134 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) | |
7135 | { | |
7136 | BdrvOpBlocker *blocker, *next; | |
f791bf7f | 7137 | GLOBAL_STATE_CODE(); |
fbe40ff7 FZ |
7138 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
7139 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { | |
7140 | if (blocker->reason == reason) { | |
7141 | QLIST_REMOVE(blocker, list); | |
7142 | g_free(blocker); | |
7143 | } | |
7144 | } | |
7145 | } | |
7146 | ||
7147 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) | |
7148 | { | |
7149 | int i; | |
f791bf7f | 7150 | GLOBAL_STATE_CODE(); |
fbe40ff7 FZ |
7151 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
7152 | bdrv_op_block(bs, i, reason); | |
7153 | } | |
7154 | } | |
7155 | ||
7156 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) | |
7157 | { | |
7158 | int i; | |
f791bf7f | 7159 | GLOBAL_STATE_CODE(); |
fbe40ff7 FZ |
7160 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
7161 | bdrv_op_unblock(bs, i, reason); | |
7162 | } | |
7163 | } | |
7164 | ||
7165 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) | |
7166 | { | |
7167 | int i; | |
f791bf7f | 7168 | GLOBAL_STATE_CODE(); |
fbe40ff7 FZ |
7169 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
7170 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { | |
7171 | return false; | |
7172 | } | |
7173 | } | |
7174 | return true; | |
7175 | } | |
7176 | ||
e1355055 KW |
7177 | /* |
7178 | * Must not be called while holding the lock of an AioContext other than the | |
7179 | * current one. | |
7180 | */ | |
d92ada22 LC |
7181 | void bdrv_img_create(const char *filename, const char *fmt, |
7182 | const char *base_filename, const char *base_fmt, | |
9217283d FZ |
7183 | char *options, uint64_t img_size, int flags, bool quiet, |
7184 | Error **errp) | |
f88e1a42 | 7185 | { |
83d0521a CL |
7186 | QemuOptsList *create_opts = NULL; |
7187 | QemuOpts *opts = NULL; | |
7188 | const char *backing_fmt, *backing_file; | |
7189 | int64_t size; | |
f88e1a42 | 7190 | BlockDriver *drv, *proto_drv; |
cc84d90f | 7191 | Error *local_err = NULL; |
f88e1a42 JS |
7192 | int ret = 0; |
7193 | ||
f791bf7f EGE |
7194 | GLOBAL_STATE_CODE(); |
7195 | ||
f88e1a42 JS |
7196 | /* Find driver and parse its options */ |
7197 | drv = bdrv_find_format(fmt); | |
7198 | if (!drv) { | |
71c79813 | 7199 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 7200 | return; |
f88e1a42 JS |
7201 | } |
7202 | ||
b65a5e12 | 7203 | proto_drv = bdrv_find_protocol(filename, true, errp); |
f88e1a42 | 7204 | if (!proto_drv) { |
d92ada22 | 7205 | return; |
f88e1a42 JS |
7206 | } |
7207 | ||
c6149724 HR |
7208 | if (!drv->create_opts) { |
7209 | error_setg(errp, "Format driver '%s' does not support image creation", | |
7210 | drv->format_name); | |
7211 | return; | |
7212 | } | |
7213 | ||
5a5e7f8c ML |
7214 | if (!proto_drv->create_opts) { |
7215 | error_setg(errp, "Protocol driver '%s' does not support image creation", | |
7216 | proto_drv->format_name); | |
7217 | return; | |
7218 | } | |
7219 | ||
f6dc1c31 | 7220 | /* Create parameter list */ |
c282e1fd | 7221 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
5a5e7f8c | 7222 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
f88e1a42 | 7223 | |
83d0521a | 7224 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
f88e1a42 JS |
7225 | |
7226 | /* Parse -o options */ | |
7227 | if (options) { | |
a5f9b9df | 7228 | if (!qemu_opts_do_parse(opts, options, NULL, errp)) { |
f88e1a42 JS |
7229 | goto out; |
7230 | } | |
7231 | } | |
7232 | ||
f6dc1c31 KW |
7233 | if (!qemu_opt_get(opts, BLOCK_OPT_SIZE)) { |
7234 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); | |
7235 | } else if (img_size != UINT64_C(-1)) { | |
7236 | error_setg(errp, "The image size must be specified only once"); | |
7237 | goto out; | |
7238 | } | |
7239 | ||
f88e1a42 | 7240 | if (base_filename) { |
235e59cf | 7241 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, |
3882578b | 7242 | NULL)) { |
71c79813 LC |
7243 | error_setg(errp, "Backing file not supported for file format '%s'", |
7244 | fmt); | |
f88e1a42 JS |
7245 | goto out; |
7246 | } | |
7247 | } | |
7248 | ||
7249 | if (base_fmt) { | |
3882578b | 7250 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, NULL)) { |
71c79813 LC |
7251 | error_setg(errp, "Backing file format not supported for file " |
7252 | "format '%s'", fmt); | |
f88e1a42 JS |
7253 | goto out; |
7254 | } | |
7255 | } | |
7256 | ||
83d0521a CL |
7257 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
7258 | if (backing_file) { | |
7259 | if (!strcmp(filename, backing_file)) { | |
71c79813 LC |
7260 | error_setg(errp, "Error: Trying to create an image with the " |
7261 | "same filename as the backing file"); | |
792da93a JS |
7262 | goto out; |
7263 | } | |
975a7bd2 CK |
7264 | if (backing_file[0] == '\0') { |
7265 | error_setg(errp, "Expected backing file name, got empty string"); | |
7266 | goto out; | |
7267 | } | |
792da93a JS |
7268 | } |
7269 | ||
83d0521a | 7270 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
f88e1a42 | 7271 | |
6e6e55f5 JS |
7272 | /* The size for the image must always be specified, unless we have a backing |
7273 | * file and we have not been forbidden from opening it. */ | |
a8b42a1c | 7274 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size); |
6e6e55f5 JS |
7275 | if (backing_file && !(flags & BDRV_O_NO_BACKING)) { |
7276 | BlockDriverState *bs; | |
645ae7d8 | 7277 | char *full_backing; |
6e6e55f5 JS |
7278 | int back_flags; |
7279 | QDict *backing_options = NULL; | |
7280 | ||
645ae7d8 HR |
7281 | full_backing = |
7282 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, | |
7283 | &local_err); | |
6e6e55f5 | 7284 | if (local_err) { |
6e6e55f5 JS |
7285 | goto out; |
7286 | } | |
645ae7d8 | 7287 | assert(full_backing); |
29168018 | 7288 | |
d5b23994 HR |
7289 | /* |
7290 | * No need to do I/O here, which allows us to open encrypted | |
7291 | * backing images without needing the secret | |
7292 | */ | |
6e6e55f5 JS |
7293 | back_flags = flags; |
7294 | back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
d5b23994 | 7295 | back_flags |= BDRV_O_NO_IO; |
f88e1a42 | 7296 | |
cc954f01 | 7297 | backing_options = qdict_new(); |
6e6e55f5 | 7298 | if (backing_fmt) { |
6e6e55f5 JS |
7299 | qdict_put_str(backing_options, "driver", backing_fmt); |
7300 | } | |
cc954f01 | 7301 | qdict_put_bool(backing_options, BDRV_OPT_FORCE_SHARE, true); |
e6641719 | 7302 | |
6e6e55f5 JS |
7303 | bs = bdrv_open(full_backing, NULL, backing_options, back_flags, |
7304 | &local_err); | |
7305 | g_free(full_backing); | |
add8200d EB |
7306 | if (!bs) { |
7307 | error_append_hint(&local_err, "Could not open backing image.\n"); | |
6e6e55f5 JS |
7308 | goto out; |
7309 | } else { | |
d9f059aa | 7310 | if (!backing_fmt) { |
497a30db EB |
7311 | error_setg(&local_err, |
7312 | "Backing file specified without backing format"); | |
fbdffb08 | 7313 | error_append_hint(&local_err, "Detected format of %s.\n", |
497a30db EB |
7314 | bs->drv->format_name); |
7315 | goto out; | |
d9f059aa | 7316 | } |
6e6e55f5 JS |
7317 | if (size == -1) { |
7318 | /* Opened BS, have no size */ | |
7319 | size = bdrv_getlength(bs); | |
7320 | if (size < 0) { | |
7321 | error_setg_errno(errp, -size, "Could not get size of '%s'", | |
7322 | backing_file); | |
7323 | bdrv_unref(bs); | |
7324 | goto out; | |
7325 | } | |
7326 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); | |
52bf1e72 | 7327 | } |
66f6b814 | 7328 | bdrv_unref(bs); |
f88e1a42 | 7329 | } |
d9f059aa EB |
7330 | /* (backing_file && !(flags & BDRV_O_NO_BACKING)) */ |
7331 | } else if (backing_file && !backing_fmt) { | |
497a30db EB |
7332 | error_setg(&local_err, |
7333 | "Backing file specified without backing format"); | |
7334 | goto out; | |
d9f059aa | 7335 | } |
6e6e55f5 JS |
7336 | |
7337 | if (size == -1) { | |
7338 | error_setg(errp, "Image creation needs a size parameter"); | |
7339 | goto out; | |
f88e1a42 JS |
7340 | } |
7341 | ||
f382d43a | 7342 | if (!quiet) { |
fe646693 | 7343 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
43c5d8f8 | 7344 | qemu_opts_print(opts, " "); |
f382d43a | 7345 | puts(""); |
4e2f4418 | 7346 | fflush(stdout); |
f382d43a | 7347 | } |
83d0521a | 7348 | |
c282e1fd | 7349 | ret = bdrv_create(drv, filename, opts, &local_err); |
83d0521a | 7350 | |
cc84d90f HR |
7351 | if (ret == -EFBIG) { |
7352 | /* This is generally a better message than whatever the driver would | |
7353 | * deliver (especially because of the cluster_size_hint), since that | |
7354 | * is most probably not much different from "image too large". */ | |
7355 | const char *cluster_size_hint = ""; | |
83d0521a | 7356 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
cc84d90f | 7357 | cluster_size_hint = " (try using a larger cluster size)"; |
f88e1a42 | 7358 | } |
cc84d90f HR |
7359 | error_setg(errp, "The image size is too large for file format '%s'" |
7360 | "%s", fmt, cluster_size_hint); | |
7361 | error_free(local_err); | |
7362 | local_err = NULL; | |
f88e1a42 JS |
7363 | } |
7364 | ||
7365 | out: | |
83d0521a CL |
7366 | qemu_opts_del(opts); |
7367 | qemu_opts_free(create_opts); | |
621ff94d | 7368 | error_propagate(errp, local_err); |
f88e1a42 | 7369 | } |
85d126f3 SH |
7370 | |
7371 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
7372 | { | |
384a48fb | 7373 | IO_CODE(); |
33f2a757 | 7374 | return bs ? bs->aio_context : qemu_get_aio_context(); |
dcd04228 SH |
7375 | } |
7376 | ||
e336fd4c KW |
7377 | AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs) |
7378 | { | |
7379 | Coroutine *self = qemu_coroutine_self(); | |
7380 | AioContext *old_ctx = qemu_coroutine_get_aio_context(self); | |
7381 | AioContext *new_ctx; | |
384a48fb | 7382 | IO_CODE(); |
e336fd4c KW |
7383 | |
7384 | /* | |
7385 | * Increase bs->in_flight to ensure that this operation is completed before | |
7386 | * moving the node to a different AioContext. Read new_ctx only afterwards. | |
7387 | */ | |
7388 | bdrv_inc_in_flight(bs); | |
7389 | ||
7390 | new_ctx = bdrv_get_aio_context(bs); | |
7391 | aio_co_reschedule_self(new_ctx); | |
7392 | return old_ctx; | |
7393 | } | |
7394 | ||
7395 | void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx) | |
7396 | { | |
384a48fb | 7397 | IO_CODE(); |
e336fd4c KW |
7398 | aio_co_reschedule_self(old_ctx); |
7399 | bdrv_dec_in_flight(bs); | |
7400 | } | |
7401 | ||
e8a095da SH |
7402 | static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban) |
7403 | { | |
bdb73476 | 7404 | GLOBAL_STATE_CODE(); |
e8a095da SH |
7405 | QLIST_REMOVE(ban, list); |
7406 | g_free(ban); | |
7407 | } | |
7408 | ||
a3a683c3 | 7409 | static void bdrv_detach_aio_context(BlockDriverState *bs) |
dcd04228 | 7410 | { |
e8a095da | 7411 | BdrvAioNotifier *baf, *baf_tmp; |
33384421 | 7412 | |
e8a095da | 7413 | assert(!bs->walking_aio_notifiers); |
da359909 | 7414 | GLOBAL_STATE_CODE(); |
e8a095da SH |
7415 | bs->walking_aio_notifiers = true; |
7416 | QLIST_FOREACH_SAFE(baf, &bs->aio_notifiers, list, baf_tmp) { | |
7417 | if (baf->deleted) { | |
7418 | bdrv_do_remove_aio_context_notifier(baf); | |
7419 | } else { | |
7420 | baf->detach_aio_context(baf->opaque); | |
7421 | } | |
33384421 | 7422 | } |
e8a095da SH |
7423 | /* Never mind iterating again to check for ->deleted. bdrv_close() will |
7424 | * remove remaining aio notifiers if we aren't called again. | |
7425 | */ | |
7426 | bs->walking_aio_notifiers = false; | |
33384421 | 7427 | |
1bffe1ae | 7428 | if (bs->drv && bs->drv->bdrv_detach_aio_context) { |
dcd04228 SH |
7429 | bs->drv->bdrv_detach_aio_context(bs); |
7430 | } | |
dcd04228 SH |
7431 | |
7432 | bs->aio_context = NULL; | |
7433 | } | |
7434 | ||
a3a683c3 KW |
7435 | static void bdrv_attach_aio_context(BlockDriverState *bs, |
7436 | AioContext *new_context) | |
dcd04228 | 7437 | { |
e8a095da | 7438 | BdrvAioNotifier *ban, *ban_tmp; |
da359909 | 7439 | GLOBAL_STATE_CODE(); |
33384421 | 7440 | |
dcd04228 SH |
7441 | bs->aio_context = new_context; |
7442 | ||
1bffe1ae | 7443 | if (bs->drv && bs->drv->bdrv_attach_aio_context) { |
dcd04228 SH |
7444 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
7445 | } | |
33384421 | 7446 | |
e8a095da SH |
7447 | assert(!bs->walking_aio_notifiers); |
7448 | bs->walking_aio_notifiers = true; | |
7449 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_tmp) { | |
7450 | if (ban->deleted) { | |
7451 | bdrv_do_remove_aio_context_notifier(ban); | |
7452 | } else { | |
7453 | ban->attached_aio_context(new_context, ban->opaque); | |
7454 | } | |
33384421 | 7455 | } |
e8a095da | 7456 | bs->walking_aio_notifiers = false; |
dcd04228 SH |
7457 | } |
7458 | ||
7e8c182f EGE |
7459 | typedef struct BdrvStateSetAioContext { |
7460 | AioContext *new_ctx; | |
7461 | BlockDriverState *bs; | |
7462 | } BdrvStateSetAioContext; | |
d616b224 | 7463 | |
7e8c182f | 7464 | static bool bdrv_parent_change_aio_context(BdrvChild *c, AioContext *ctx, |
e08cc001 EGE |
7465 | GHashTable *visited, |
7466 | Transaction *tran, | |
7e8c182f | 7467 | Error **errp) |
5d231849 | 7468 | { |
f0c28327 | 7469 | GLOBAL_STATE_CODE(); |
e08cc001 | 7470 | if (g_hash_table_contains(visited, c)) { |
5d231849 KW |
7471 | return true; |
7472 | } | |
e08cc001 | 7473 | g_hash_table_add(visited, c); |
5d231849 | 7474 | |
bd86fb99 HR |
7475 | /* |
7476 | * A BdrvChildClass that doesn't handle AioContext changes cannot | |
7477 | * tolerate any AioContext changes | |
7478 | */ | |
7e8c182f | 7479 | if (!c->klass->change_aio_ctx) { |
5d231849 KW |
7480 | char *user = bdrv_child_user_desc(c); |
7481 | error_setg(errp, "Changing iothreads is not supported by %s", user); | |
7482 | g_free(user); | |
7483 | return false; | |
7484 | } | |
7e8c182f | 7485 | if (!c->klass->change_aio_ctx(c, ctx, visited, tran, errp)) { |
5d231849 KW |
7486 | assert(!errp || *errp); |
7487 | return false; | |
7488 | } | |
7489 | return true; | |
7490 | } | |
7491 | ||
7e8c182f | 7492 | bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx, |
e08cc001 | 7493 | GHashTable *visited, Transaction *tran, |
7e8c182f | 7494 | Error **errp) |
5d231849 | 7495 | { |
f791bf7f | 7496 | GLOBAL_STATE_CODE(); |
e08cc001 | 7497 | if (g_hash_table_contains(visited, c)) { |
5d231849 KW |
7498 | return true; |
7499 | } | |
e08cc001 | 7500 | g_hash_table_add(visited, c); |
7e8c182f | 7501 | return bdrv_change_aio_context(c->bs, ctx, visited, tran, errp); |
5d231849 KW |
7502 | } |
7503 | ||
7e8c182f EGE |
7504 | static void bdrv_set_aio_context_clean(void *opaque) |
7505 | { | |
7506 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; | |
7507 | BlockDriverState *bs = (BlockDriverState *) state->bs; | |
7508 | ||
7509 | /* Paired with bdrv_drained_begin in bdrv_change_aio_context() */ | |
7510 | bdrv_drained_end(bs); | |
7511 | ||
7512 | g_free(state); | |
7513 | } | |
7514 | ||
7515 | static void bdrv_set_aio_context_commit(void *opaque) | |
7516 | { | |
7517 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; | |
7518 | BlockDriverState *bs = (BlockDriverState *) state->bs; | |
7519 | AioContext *new_context = state->new_ctx; | |
7e8c182f | 7520 | |
7e8c182f | 7521 | bdrv_detach_aio_context(bs); |
7e8c182f EGE |
7522 | bdrv_attach_aio_context(bs, new_context); |
7523 | } | |
7524 | ||
7525 | static TransactionActionDrv set_aio_context = { | |
7526 | .commit = bdrv_set_aio_context_commit, | |
7527 | .clean = bdrv_set_aio_context_clean, | |
7528 | }; | |
7529 | ||
7530 | /* | |
7531 | * Changes the AioContext used for fd handlers, timers, and BHs by this | |
7532 | * BlockDriverState and all its children and parents. | |
7533 | * | |
7534 | * Must be called from the main AioContext. | |
7535 | * | |
7e8c182f EGE |
7536 | * @visited will accumulate all visited BdrvChild objects. The caller is |
7537 | * responsible for freeing the list afterwards. | |
7538 | */ | |
7539 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, | |
e08cc001 | 7540 | GHashTable *visited, Transaction *tran, |
7e8c182f | 7541 | Error **errp) |
5d231849 KW |
7542 | { |
7543 | BdrvChild *c; | |
7e8c182f EGE |
7544 | BdrvStateSetAioContext *state; |
7545 | ||
7546 | GLOBAL_STATE_CODE(); | |
5d231849 KW |
7547 | |
7548 | if (bdrv_get_aio_context(bs) == ctx) { | |
7549 | return true; | |
7550 | } | |
7551 | ||
7f831d29 | 7552 | bdrv_graph_rdlock_main_loop(); |
5d231849 | 7553 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
7e8c182f | 7554 | if (!bdrv_parent_change_aio_context(c, ctx, visited, tran, errp)) { |
7f831d29 | 7555 | bdrv_graph_rdunlock_main_loop(); |
5d231849 KW |
7556 | return false; |
7557 | } | |
7558 | } | |
7e8c182f | 7559 | |
5d231849 | 7560 | QLIST_FOREACH(c, &bs->children, next) { |
7e8c182f | 7561 | if (!bdrv_child_change_aio_context(c, ctx, visited, tran, errp)) { |
7f831d29 | 7562 | bdrv_graph_rdunlock_main_loop(); |
5d231849 KW |
7563 | return false; |
7564 | } | |
7565 | } | |
7f831d29 | 7566 | bdrv_graph_rdunlock_main_loop(); |
5d231849 | 7567 | |
7e8c182f EGE |
7568 | state = g_new(BdrvStateSetAioContext, 1); |
7569 | *state = (BdrvStateSetAioContext) { | |
7570 | .new_ctx = ctx, | |
7571 | .bs = bs, | |
7572 | }; | |
7573 | ||
7574 | /* Paired with bdrv_drained_end in bdrv_set_aio_context_clean() */ | |
7575 | bdrv_drained_begin(bs); | |
7576 | ||
7577 | tran_add(tran, &set_aio_context, state); | |
7578 | ||
5d231849 KW |
7579 | return true; |
7580 | } | |
7581 | ||
7e8c182f EGE |
7582 | /* |
7583 | * Change bs's and recursively all of its parents' and children's AioContext | |
7584 | * to the given new context, returning an error if that isn't possible. | |
7585 | * | |
7586 | * If ignore_child is not NULL, that child (and its subgraph) will not | |
7587 | * be touched. | |
7e8c182f | 7588 | */ |
a41cfda1 EGE |
7589 | int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
7590 | BdrvChild *ignore_child, Error **errp) | |
5d231849 | 7591 | { |
7e8c182f | 7592 | Transaction *tran; |
e08cc001 | 7593 | GHashTable *visited; |
7e8c182f | 7594 | int ret; |
f791bf7f EGE |
7595 | GLOBAL_STATE_CODE(); |
7596 | ||
7e8c182f EGE |
7597 | /* |
7598 | * Recursion phase: go through all nodes of the graph. | |
7599 | * Take care of checking that all nodes support changing AioContext | |
3202d8e4 | 7600 | * and drain them, building a linear list of callbacks to run if everything |
7e8c182f EGE |
7601 | * is successful (the transaction itself). |
7602 | */ | |
7603 | tran = tran_new(); | |
e08cc001 EGE |
7604 | visited = g_hash_table_new(NULL, NULL); |
7605 | if (ignore_child) { | |
7606 | g_hash_table_add(visited, ignore_child); | |
7607 | } | |
7608 | ret = bdrv_change_aio_context(bs, ctx, visited, tran, errp); | |
7609 | g_hash_table_destroy(visited); | |
7e8c182f EGE |
7610 | |
7611 | /* | |
7612 | * Linear phase: go through all callbacks collected in the transaction. | |
23c983c8 SH |
7613 | * Run all callbacks collected in the recursion to switch every node's |
7614 | * AioContext (transaction commit), or undo all changes done in the | |
7e8c182f EGE |
7615 | * recursion (transaction abort). |
7616 | */ | |
5d231849 KW |
7617 | |
7618 | if (!ret) { | |
7e8c182f EGE |
7619 | /* Just run clean() callbacks. No AioContext changed. */ |
7620 | tran_abort(tran); | |
5d231849 KW |
7621 | return -EPERM; |
7622 | } | |
7623 | ||
7e8c182f | 7624 | tran_commit(tran); |
7e8c182f | 7625 | return 0; |
5d231849 KW |
7626 | } |
7627 | ||
33384421 HR |
7628 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
7629 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
7630 | void (*detach_aio_context)(void *opaque), void *opaque) | |
7631 | { | |
7632 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); | |
7633 | *ban = (BdrvAioNotifier){ | |
7634 | .attached_aio_context = attached_aio_context, | |
7635 | .detach_aio_context = detach_aio_context, | |
7636 | .opaque = opaque | |
7637 | }; | |
f791bf7f | 7638 | GLOBAL_STATE_CODE(); |
33384421 HR |
7639 | |
7640 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); | |
7641 | } | |
7642 | ||
7643 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, | |
7644 | void (*attached_aio_context)(AioContext *, | |
7645 | void *), | |
7646 | void (*detach_aio_context)(void *), | |
7647 | void *opaque) | |
7648 | { | |
7649 | BdrvAioNotifier *ban, *ban_next; | |
f791bf7f | 7650 | GLOBAL_STATE_CODE(); |
33384421 HR |
7651 | |
7652 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
7653 | if (ban->attached_aio_context == attached_aio_context && | |
7654 | ban->detach_aio_context == detach_aio_context && | |
e8a095da SH |
7655 | ban->opaque == opaque && |
7656 | ban->deleted == false) | |
33384421 | 7657 | { |
e8a095da SH |
7658 | if (bs->walking_aio_notifiers) { |
7659 | ban->deleted = true; | |
7660 | } else { | |
7661 | bdrv_do_remove_aio_context_notifier(ban); | |
7662 | } | |
33384421 HR |
7663 | return; |
7664 | } | |
7665 | } | |
7666 | ||
7667 | abort(); | |
7668 | } | |
7669 | ||
77485434 | 7670 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
d1402b50 | 7671 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
a3579bfa | 7672 | bool force, |
d1402b50 | 7673 | Error **errp) |
6f176b48 | 7674 | { |
f791bf7f | 7675 | GLOBAL_STATE_CODE(); |
d470ad42 | 7676 | if (!bs->drv) { |
d1402b50 | 7677 | error_setg(errp, "Node is ejected"); |
d470ad42 HR |
7678 | return -ENOMEDIUM; |
7679 | } | |
c282e1fd | 7680 | if (!bs->drv->bdrv_amend_options) { |
d1402b50 HR |
7681 | error_setg(errp, "Block driver '%s' does not support option amendment", |
7682 | bs->drv->format_name); | |
6f176b48 HR |
7683 | return -ENOTSUP; |
7684 | } | |
a3579bfa ML |
7685 | return bs->drv->bdrv_amend_options(bs, opts, status_cb, |
7686 | cb_opaque, force, errp); | |
6f176b48 | 7687 | } |
f6186f49 | 7688 | |
5d69b5ab HR |
7689 | /* |
7690 | * This function checks whether the given @to_replace is allowed to be | |
7691 | * replaced by a node that always shows the same data as @bs. This is | |
7692 | * used for example to verify whether the mirror job can replace | |
7693 | * @to_replace by the target mirrored from @bs. | |
7694 | * To be replaceable, @bs and @to_replace may either be guaranteed to | |
7695 | * always show the same data (because they are only connected through | |
7696 | * filters), or some driver may allow replacing one of its children | |
7697 | * because it can guarantee that this child's data is not visible at | |
7698 | * all (for example, for dissenting quorum children that have no other | |
7699 | * parents). | |
7700 | */ | |
7701 | bool bdrv_recurse_can_replace(BlockDriverState *bs, | |
7702 | BlockDriverState *to_replace) | |
7703 | { | |
93393e69 HR |
7704 | BlockDriverState *filtered; |
7705 | ||
b4ad82aa EGE |
7706 | GLOBAL_STATE_CODE(); |
7707 | ||
5d69b5ab HR |
7708 | if (!bs || !bs->drv) { |
7709 | return false; | |
7710 | } | |
7711 | ||
7712 | if (bs == to_replace) { | |
7713 | return true; | |
7714 | } | |
7715 | ||
7716 | /* See what the driver can do */ | |
7717 | if (bs->drv->bdrv_recurse_can_replace) { | |
7718 | return bs->drv->bdrv_recurse_can_replace(bs, to_replace); | |
7719 | } | |
7720 | ||
7721 | /* For filters without an own implementation, we can recurse on our own */ | |
93393e69 HR |
7722 | filtered = bdrv_filter_bs(bs); |
7723 | if (filtered) { | |
7724 | return bdrv_recurse_can_replace(filtered, to_replace); | |
5d69b5ab HR |
7725 | } |
7726 | ||
7727 | /* Safe default */ | |
7728 | return false; | |
7729 | } | |
7730 | ||
810803a8 HR |
7731 | /* |
7732 | * Check whether the given @node_name can be replaced by a node that | |
7733 | * has the same data as @parent_bs. If so, return @node_name's BDS; | |
7734 | * NULL otherwise. | |
7735 | * | |
7736 | * @node_name must be a (recursive) *child of @parent_bs (or this | |
7737 | * function will return NULL). | |
7738 | * | |
7739 | * The result (whether the node can be replaced or not) is only valid | |
7740 | * for as long as no graph or permission changes occur. | |
7741 | */ | |
e12f3784 WC |
7742 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
7743 | const char *node_name, Error **errp) | |
09158f00 BC |
7744 | { |
7745 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); | |
5a7e7a0b | 7746 | |
f791bf7f EGE |
7747 | GLOBAL_STATE_CODE(); |
7748 | ||
09158f00 | 7749 | if (!to_replace_bs) { |
785ec4b1 | 7750 | error_setg(errp, "Failed to find node with node-name='%s'", node_name); |
09158f00 BC |
7751 | return NULL; |
7752 | } | |
7753 | ||
7754 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { | |
b49f4755 | 7755 | return NULL; |
09158f00 BC |
7756 | } |
7757 | ||
7758 | /* We don't want arbitrary node of the BDS chain to be replaced only the top | |
7759 | * most non filter in order to prevent data corruption. | |
7760 | * Another benefit is that this tests exclude backing files which are | |
7761 | * blocked by the backing blockers. | |
7762 | */ | |
810803a8 HR |
7763 | if (!bdrv_recurse_can_replace(parent_bs, to_replace_bs)) { |
7764 | error_setg(errp, "Cannot replace '%s' by a node mirrored from '%s', " | |
7765 | "because it cannot be guaranteed that doing so would not " | |
7766 | "lead to an abrupt change of visible data", | |
7767 | node_name, parent_bs->node_name); | |
b49f4755 | 7768 | return NULL; |
09158f00 BC |
7769 | } |
7770 | ||
7771 | return to_replace_bs; | |
7772 | } | |
448ad91d | 7773 | |
97e2f021 HR |
7774 | /** |
7775 | * Iterates through the list of runtime option keys that are said to | |
7776 | * be "strong" for a BDS. An option is called "strong" if it changes | |
7777 | * a BDS's data. For example, the null block driver's "size" and | |
7778 | * "read-zeroes" options are strong, but its "latency-ns" option is | |
7779 | * not. | |
7780 | * | |
7781 | * If a key returned by this function ends with a dot, all options | |
7782 | * starting with that prefix are strong. | |
7783 | */ | |
7784 | static const char *const *strong_options(BlockDriverState *bs, | |
7785 | const char *const *curopt) | |
7786 | { | |
7787 | static const char *const global_options[] = { | |
7788 | "driver", "filename", NULL | |
7789 | }; | |
7790 | ||
7791 | if (!curopt) { | |
7792 | return &global_options[0]; | |
7793 | } | |
7794 | ||
7795 | curopt++; | |
7796 | if (curopt == &global_options[ARRAY_SIZE(global_options) - 1] && bs->drv) { | |
7797 | curopt = bs->drv->strong_runtime_opts; | |
7798 | } | |
7799 | ||
7800 | return (curopt && *curopt) ? curopt : NULL; | |
7801 | } | |
7802 | ||
7803 | /** | |
7804 | * Copies all strong runtime options from bs->options to the given | |
7805 | * QDict. The set of strong option keys is determined by invoking | |
7806 | * strong_options(). | |
7807 | * | |
7808 | * Returns true iff any strong option was present in bs->options (and | |
7809 | * thus copied to the target QDict) with the exception of "filename" | |
7810 | * and "driver". The caller is expected to use this value to decide | |
7811 | * whether the existence of strong options prevents the generation of | |
7812 | * a plain filename. | |
7813 | */ | |
7814 | static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs) | |
7815 | { | |
7816 | bool found_any = false; | |
7817 | const char *const *option_name = NULL; | |
7818 | ||
7819 | if (!bs->drv) { | |
7820 | return false; | |
7821 | } | |
7822 | ||
7823 | while ((option_name = strong_options(bs, option_name))) { | |
7824 | bool option_given = false; | |
7825 | ||
7826 | assert(strlen(*option_name) > 0); | |
7827 | if ((*option_name)[strlen(*option_name) - 1] != '.') { | |
7828 | QObject *entry = qdict_get(bs->options, *option_name); | |
7829 | if (!entry) { | |
7830 | continue; | |
7831 | } | |
7832 | ||
7833 | qdict_put_obj(d, *option_name, qobject_ref(entry)); | |
7834 | option_given = true; | |
7835 | } else { | |
7836 | const QDictEntry *entry; | |
7837 | for (entry = qdict_first(bs->options); entry; | |
7838 | entry = qdict_next(bs->options, entry)) | |
7839 | { | |
7840 | if (strstart(qdict_entry_key(entry), *option_name, NULL)) { | |
7841 | qdict_put_obj(d, qdict_entry_key(entry), | |
7842 | qobject_ref(qdict_entry_value(entry))); | |
7843 | option_given = true; | |
7844 | } | |
7845 | } | |
7846 | } | |
7847 | ||
7848 | /* While "driver" and "filename" need to be included in a JSON filename, | |
7849 | * their existence does not prohibit generation of a plain filename. */ | |
7850 | if (!found_any && option_given && | |
7851 | strcmp(*option_name, "driver") && strcmp(*option_name, "filename")) | |
7852 | { | |
7853 | found_any = true; | |
7854 | } | |
7855 | } | |
7856 | ||
62a01a27 HR |
7857 | if (!qdict_haskey(d, "driver")) { |
7858 | /* Drivers created with bdrv_new_open_driver() may not have a | |
7859 | * @driver option. Add it here. */ | |
7860 | qdict_put_str(d, "driver", bs->drv->format_name); | |
7861 | } | |
7862 | ||
97e2f021 HR |
7863 | return found_any; |
7864 | } | |
7865 | ||
90993623 HR |
7866 | /* Note: This function may return false positives; it may return true |
7867 | * even if opening the backing file specified by bs's image header | |
7868 | * would result in exactly bs->backing. */ | |
004915a9 | 7869 | static bool GRAPH_RDLOCK bdrv_backing_overridden(BlockDriverState *bs) |
90993623 | 7870 | { |
b4ad82aa | 7871 | GLOBAL_STATE_CODE(); |
90993623 HR |
7872 | if (bs->backing) { |
7873 | return strcmp(bs->auto_backing_file, | |
7874 | bs->backing->bs->filename); | |
7875 | } else { | |
7876 | /* No backing BDS, so if the image header reports any backing | |
7877 | * file, it must have been suppressed */ | |
7878 | return bs->auto_backing_file[0] != '\0'; | |
7879 | } | |
7880 | } | |
7881 | ||
91af7014 HR |
7882 | /* Updates the following BDS fields: |
7883 | * - exact_filename: A filename which may be used for opening a block device | |
7884 | * which (mostly) equals the given BDS (even without any | |
7885 | * other options; so reading and writing must return the same | |
7886 | * results, but caching etc. may be different) | |
7887 | * - full_open_options: Options which, when given when opening a block device | |
7888 | * (without a filename), result in a BDS (mostly) | |
7889 | * equalling the given one | |
7890 | * - filename: If exact_filename is set, it is copied here. Otherwise, | |
7891 | * full_open_options is converted to a JSON object, prefixed with | |
7892 | * "json:" (for use through the JSON pseudo protocol) and put here. | |
7893 | */ | |
7894 | void bdrv_refresh_filename(BlockDriverState *bs) | |
7895 | { | |
7896 | BlockDriver *drv = bs->drv; | |
e24518e3 | 7897 | BdrvChild *child; |
52f72d6f | 7898 | BlockDriverState *primary_child_bs; |
91af7014 | 7899 | QDict *opts; |
90993623 | 7900 | bool backing_overridden; |
998b3a1e HR |
7901 | bool generate_json_filename; /* Whether our default implementation should |
7902 | fill exact_filename (false) or not (true) */ | |
91af7014 | 7903 | |
f791bf7f EGE |
7904 | GLOBAL_STATE_CODE(); |
7905 | ||
91af7014 HR |
7906 | if (!drv) { |
7907 | return; | |
7908 | } | |
7909 | ||
e24518e3 HR |
7910 | /* This BDS's file name may depend on any of its children's file names, so |
7911 | * refresh those first */ | |
7912 | QLIST_FOREACH(child, &bs->children, next) { | |
7913 | bdrv_refresh_filename(child->bs); | |
91af7014 HR |
7914 | } |
7915 | ||
bb808d5f HR |
7916 | if (bs->implicit) { |
7917 | /* For implicit nodes, just copy everything from the single child */ | |
7918 | child = QLIST_FIRST(&bs->children); | |
7919 | assert(QLIST_NEXT(child, next) == NULL); | |
7920 | ||
7921 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), | |
7922 | child->bs->exact_filename); | |
7923 | pstrcpy(bs->filename, sizeof(bs->filename), child->bs->filename); | |
7924 | ||
cb895614 | 7925 | qobject_unref(bs->full_open_options); |
bb808d5f HR |
7926 | bs->full_open_options = qobject_ref(child->bs->full_open_options); |
7927 | ||
7928 | return; | |
7929 | } | |
7930 | ||
90993623 HR |
7931 | backing_overridden = bdrv_backing_overridden(bs); |
7932 | ||
7933 | if (bs->open_flags & BDRV_O_NO_IO) { | |
7934 | /* Without I/O, the backing file does not change anything. | |
7935 | * Therefore, in such a case (primarily qemu-img), we can | |
7936 | * pretend the backing file has not been overridden even if | |
7937 | * it technically has been. */ | |
7938 | backing_overridden = false; | |
7939 | } | |
7940 | ||
97e2f021 HR |
7941 | /* Gather the options QDict */ |
7942 | opts = qdict_new(); | |
998b3a1e HR |
7943 | generate_json_filename = append_strong_runtime_options(opts, bs); |
7944 | generate_json_filename |= backing_overridden; | |
97e2f021 HR |
7945 | |
7946 | if (drv->bdrv_gather_child_options) { | |
7947 | /* Some block drivers may not want to present all of their children's | |
7948 | * options, or name them differently from BdrvChild.name */ | |
7949 | drv->bdrv_gather_child_options(bs, opts, backing_overridden); | |
7950 | } else { | |
7951 | QLIST_FOREACH(child, &bs->children, next) { | |
25191e5f | 7952 | if (child == bs->backing && !backing_overridden) { |
97e2f021 HR |
7953 | /* We can skip the backing BDS if it has not been overridden */ |
7954 | continue; | |
7955 | } | |
7956 | ||
7957 | qdict_put(opts, child->name, | |
7958 | qobject_ref(child->bs->full_open_options)); | |
7959 | } | |
7960 | ||
7961 | if (backing_overridden && !bs->backing) { | |
7962 | /* Force no backing file */ | |
7963 | qdict_put_null(opts, "backing"); | |
7964 | } | |
7965 | } | |
7966 | ||
7967 | qobject_unref(bs->full_open_options); | |
7968 | bs->full_open_options = opts; | |
7969 | ||
52f72d6f HR |
7970 | primary_child_bs = bdrv_primary_bs(bs); |
7971 | ||
998b3a1e HR |
7972 | if (drv->bdrv_refresh_filename) { |
7973 | /* Obsolete information is of no use here, so drop the old file name | |
7974 | * information before refreshing it */ | |
7975 | bs->exact_filename[0] = '\0'; | |
7976 | ||
7977 | drv->bdrv_refresh_filename(bs); | |
52f72d6f HR |
7978 | } else if (primary_child_bs) { |
7979 | /* | |
7980 | * Try to reconstruct valid information from the underlying | |
7981 | * file -- this only works for format nodes (filter nodes | |
7982 | * cannot be probed and as such must be selected by the user | |
7983 | * either through an options dict, or through a special | |
7984 | * filename which the filter driver must construct in its | |
7985 | * .bdrv_refresh_filename() implementation). | |
7986 | */ | |
998b3a1e HR |
7987 | |
7988 | bs->exact_filename[0] = '\0'; | |
7989 | ||
fb695c74 HR |
7990 | /* |
7991 | * We can use the underlying file's filename if: | |
7992 | * - it has a filename, | |
52f72d6f | 7993 | * - the current BDS is not a filter, |
fb695c74 HR |
7994 | * - the file is a protocol BDS, and |
7995 | * - opening that file (as this BDS's format) will automatically create | |
7996 | * the BDS tree we have right now, that is: | |
7997 | * - the user did not significantly change this BDS's behavior with | |
7998 | * some explicit (strong) options | |
7999 | * - no non-file child of this BDS has been overridden by the user | |
8000 | * Both of these conditions are represented by generate_json_filename. | |
8001 | */ | |
52f72d6f HR |
8002 | if (primary_child_bs->exact_filename[0] && |
8003 | primary_child_bs->drv->bdrv_file_open && | |
8004 | !drv->is_filter && !generate_json_filename) | |
fb695c74 | 8005 | { |
52f72d6f | 8006 | strcpy(bs->exact_filename, primary_child_bs->exact_filename); |
998b3a1e HR |
8007 | } |
8008 | } | |
8009 | ||
91af7014 HR |
8010 | if (bs->exact_filename[0]) { |
8011 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); | |
97e2f021 | 8012 | } else { |
eab3a467 | 8013 | GString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
5c86bdf1 | 8014 | if (snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
eab3a467 | 8015 | json->str) >= sizeof(bs->filename)) { |
5c86bdf1 EB |
8016 | /* Give user a hint if we truncated things. */ |
8017 | strcpy(bs->filename + sizeof(bs->filename) - 4, "..."); | |
8018 | } | |
eab3a467 | 8019 | g_string_free(json, true); |
91af7014 HR |
8020 | } |
8021 | } | |
e06018ad | 8022 | |
1e89d0f9 HR |
8023 | char *bdrv_dirname(BlockDriverState *bs, Error **errp) |
8024 | { | |
8025 | BlockDriver *drv = bs->drv; | |
52f72d6f | 8026 | BlockDriverState *child_bs; |
1e89d0f9 | 8027 | |
f791bf7f EGE |
8028 | GLOBAL_STATE_CODE(); |
8029 | ||
1e89d0f9 HR |
8030 | if (!drv) { |
8031 | error_setg(errp, "Node '%s' is ejected", bs->node_name); | |
8032 | return NULL; | |
8033 | } | |
8034 | ||
8035 | if (drv->bdrv_dirname) { | |
8036 | return drv->bdrv_dirname(bs, errp); | |
8037 | } | |
8038 | ||
52f72d6f HR |
8039 | child_bs = bdrv_primary_bs(bs); |
8040 | if (child_bs) { | |
8041 | return bdrv_dirname(child_bs, errp); | |
1e89d0f9 HR |
8042 | } |
8043 | ||
8044 | bdrv_refresh_filename(bs); | |
8045 | if (bs->exact_filename[0] != '\0') { | |
8046 | return path_combine(bs->exact_filename, ""); | |
8047 | } | |
8048 | ||
8049 | error_setg(errp, "Cannot generate a base directory for %s nodes", | |
8050 | drv->format_name); | |
8051 | return NULL; | |
8052 | } | |
8053 | ||
e06018ad WC |
8054 | /* |
8055 | * Hot add/remove a BDS's child. So the user can take a child offline when | |
8056 | * it is broken and take a new child online | |
8057 | */ | |
8058 | void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, | |
8059 | Error **errp) | |
8060 | { | |
f791bf7f | 8061 | GLOBAL_STATE_CODE(); |
e06018ad WC |
8062 | if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { |
8063 | error_setg(errp, "The node %s does not support adding a child", | |
8064 | bdrv_get_device_or_node_name(parent_bs)); | |
8065 | return; | |
8066 | } | |
8067 | ||
774c726c SL |
8068 | /* |
8069 | * Non-zoned block drivers do not follow zoned storage constraints | |
8070 | * (i.e. sequential writes to zones). Refuse mixing zoned and non-zoned | |
8071 | * drivers in a graph. | |
8072 | */ | |
8073 | if (!parent_bs->drv->supports_zoned_children && | |
8074 | child_bs->bl.zoned == BLK_Z_HM) { | |
8075 | /* | |
8076 | * The host-aware model allows zoned storage constraints and random | |
8077 | * write. Allow mixing host-aware and non-zoned drivers. Using | |
8078 | * host-aware device as a regular device. | |
8079 | */ | |
8080 | error_setg(errp, "Cannot add a %s child to a %s parent", | |
8081 | child_bs->bl.zoned == BLK_Z_HM ? "zoned" : "non-zoned", | |
8082 | parent_bs->drv->supports_zoned_children ? | |
8083 | "support zoned children" : "not support zoned children"); | |
8084 | return; | |
8085 | } | |
8086 | ||
e06018ad WC |
8087 | if (!QLIST_EMPTY(&child_bs->parents)) { |
8088 | error_setg(errp, "The node %s already has a parent", | |
8089 | child_bs->node_name); | |
8090 | return; | |
8091 | } | |
8092 | ||
8093 | parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); | |
8094 | } | |
8095 | ||
8096 | void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp) | |
8097 | { | |
8098 | BdrvChild *tmp; | |
8099 | ||
f791bf7f | 8100 | GLOBAL_STATE_CODE(); |
e06018ad WC |
8101 | if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { |
8102 | error_setg(errp, "The node %s does not support removing a child", | |
8103 | bdrv_get_device_or_node_name(parent_bs)); | |
8104 | return; | |
8105 | } | |
8106 | ||
8107 | QLIST_FOREACH(tmp, &parent_bs->children, next) { | |
8108 | if (tmp == child) { | |
8109 | break; | |
8110 | } | |
8111 | } | |
8112 | ||
8113 | if (!tmp) { | |
8114 | error_setg(errp, "The node %s does not have a child named %s", | |
8115 | bdrv_get_device_or_node_name(parent_bs), | |
8116 | bdrv_get_device_or_node_name(child->bs)); | |
8117 | return; | |
8118 | } | |
8119 | ||
8120 | parent_bs->drv->bdrv_del_child(parent_bs, child, errp); | |
8121 | } | |
6f7a3b53 HR |
8122 | |
8123 | int bdrv_make_empty(BdrvChild *c, Error **errp) | |
8124 | { | |
8125 | BlockDriver *drv = c->bs->drv; | |
8126 | int ret; | |
8127 | ||
f791bf7f | 8128 | GLOBAL_STATE_CODE(); |
6f7a3b53 HR |
8129 | assert(c->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)); |
8130 | ||
8131 | if (!drv->bdrv_make_empty) { | |
8132 | error_setg(errp, "%s does not support emptying nodes", | |
8133 | drv->format_name); | |
8134 | return -ENOTSUP; | |
8135 | } | |
8136 | ||
8137 | ret = drv->bdrv_make_empty(c->bs); | |
8138 | if (ret < 0) { | |
8139 | error_setg_errno(errp, -ret, "Failed to empty %s", | |
8140 | c->bs->filename); | |
8141 | return ret; | |
8142 | } | |
8143 | ||
8144 | return 0; | |
8145 | } | |
9a6fc887 HR |
8146 | |
8147 | /* | |
8148 | * Return the child that @bs acts as an overlay for, and from which data may be | |
8149 | * copied in COW or COR operations. Usually this is the backing file. | |
8150 | */ | |
8151 | BdrvChild *bdrv_cow_child(BlockDriverState *bs) | |
8152 | { | |
967d7905 EGE |
8153 | IO_CODE(); |
8154 | ||
9a6fc887 HR |
8155 | if (!bs || !bs->drv) { |
8156 | return NULL; | |
8157 | } | |
8158 | ||
8159 | if (bs->drv->is_filter) { | |
8160 | return NULL; | |
8161 | } | |
8162 | ||
8163 | if (!bs->backing) { | |
8164 | return NULL; | |
8165 | } | |
8166 | ||
8167 | assert(bs->backing->role & BDRV_CHILD_COW); | |
8168 | return bs->backing; | |
8169 | } | |
8170 | ||
8171 | /* | |
8172 | * If @bs acts as a filter for exactly one of its children, return | |
8173 | * that child. | |
8174 | */ | |
8175 | BdrvChild *bdrv_filter_child(BlockDriverState *bs) | |
8176 | { | |
8177 | BdrvChild *c; | |
967d7905 | 8178 | IO_CODE(); |
9a6fc887 HR |
8179 | |
8180 | if (!bs || !bs->drv) { | |
8181 | return NULL; | |
8182 | } | |
8183 | ||
8184 | if (!bs->drv->is_filter) { | |
8185 | return NULL; | |
8186 | } | |
8187 | ||
8188 | /* Only one of @backing or @file may be used */ | |
8189 | assert(!(bs->backing && bs->file)); | |
8190 | ||
8191 | c = bs->backing ?: bs->file; | |
8192 | if (!c) { | |
8193 | return NULL; | |
8194 | } | |
8195 | ||
8196 | assert(c->role & BDRV_CHILD_FILTERED); | |
8197 | return c; | |
8198 | } | |
8199 | ||
8200 | /* | |
8201 | * Return either the result of bdrv_cow_child() or bdrv_filter_child(), | |
8202 | * whichever is non-NULL. | |
8203 | * | |
8204 | * Return NULL if both are NULL. | |
8205 | */ | |
8206 | BdrvChild *bdrv_filter_or_cow_child(BlockDriverState *bs) | |
8207 | { | |
8208 | BdrvChild *cow_child = bdrv_cow_child(bs); | |
8209 | BdrvChild *filter_child = bdrv_filter_child(bs); | |
967d7905 | 8210 | IO_CODE(); |
9a6fc887 HR |
8211 | |
8212 | /* Filter nodes cannot have COW backing files */ | |
8213 | assert(!(cow_child && filter_child)); | |
8214 | ||
8215 | return cow_child ?: filter_child; | |
8216 | } | |
8217 | ||
8218 | /* | |
8219 | * Return the primary child of this node: For filters, that is the | |
8220 | * filtered child. For other nodes, that is usually the child storing | |
8221 | * metadata. | |
8222 | * (A generally more helpful description is that this is (usually) the | |
8223 | * child that has the same filename as @bs.) | |
8224 | * | |
8225 | * Drivers do not necessarily have a primary child; for example quorum | |
8226 | * does not. | |
8227 | */ | |
8228 | BdrvChild *bdrv_primary_child(BlockDriverState *bs) | |
8229 | { | |
8230 | BdrvChild *c, *found = NULL; | |
967d7905 | 8231 | IO_CODE(); |
9a6fc887 HR |
8232 | |
8233 | QLIST_FOREACH(c, &bs->children, next) { | |
8234 | if (c->role & BDRV_CHILD_PRIMARY) { | |
8235 | assert(!found); | |
8236 | found = c; | |
8237 | } | |
8238 | } | |
8239 | ||
8240 | return found; | |
8241 | } | |
d38d7eb8 | 8242 | |
ec82cc41 KW |
8243 | static BlockDriverState * GRAPH_RDLOCK |
8244 | bdrv_do_skip_filters(BlockDriverState *bs, bool stop_on_explicit_filter) | |
d38d7eb8 HR |
8245 | { |
8246 | BdrvChild *c; | |
8247 | ||
8248 | if (!bs) { | |
8249 | return NULL; | |
8250 | } | |
8251 | ||
8252 | while (!(stop_on_explicit_filter && !bs->implicit)) { | |
8253 | c = bdrv_filter_child(bs); | |
8254 | if (!c) { | |
8255 | /* | |
8256 | * A filter that is embedded in a working block graph must | |
8257 | * have a child. Assert this here so this function does | |
8258 | * not return a filter node that is not expected by the | |
8259 | * caller. | |
8260 | */ | |
8261 | assert(!bs->drv || !bs->drv->is_filter); | |
8262 | break; | |
8263 | } | |
8264 | bs = c->bs; | |
8265 | } | |
8266 | /* | |
8267 | * Note that this treats nodes with bs->drv == NULL as not being | |
8268 | * filters (bs->drv == NULL should be replaced by something else | |
8269 | * anyway). | |
8270 | * The advantage of this behavior is that this function will thus | |
8271 | * always return a non-NULL value (given a non-NULL @bs). | |
8272 | */ | |
8273 | ||
8274 | return bs; | |
8275 | } | |
8276 | ||
8277 | /* | |
8278 | * Return the first BDS that has not been added implicitly or that | |
8279 | * does not have a filtered child down the chain starting from @bs | |
8280 | * (including @bs itself). | |
8281 | */ | |
8282 | BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs) | |
8283 | { | |
b4ad82aa | 8284 | GLOBAL_STATE_CODE(); |
d38d7eb8 HR |
8285 | return bdrv_do_skip_filters(bs, true); |
8286 | } | |
8287 | ||
8288 | /* | |
8289 | * Return the first BDS that does not have a filtered child down the | |
8290 | * chain starting from @bs (including @bs itself). | |
8291 | */ | |
8292 | BlockDriverState *bdrv_skip_filters(BlockDriverState *bs) | |
8293 | { | |
967d7905 | 8294 | IO_CODE(); |
d38d7eb8 HR |
8295 | return bdrv_do_skip_filters(bs, false); |
8296 | } | |
8297 | ||
8298 | /* | |
8299 | * For a backing chain, return the first non-filter backing image of | |
8300 | * the first non-filter image. | |
8301 | */ | |
8302 | BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs) | |
8303 | { | |
967d7905 | 8304 | IO_CODE(); |
d38d7eb8 HR |
8305 | return bdrv_skip_filters(bdrv_cow_bs(bdrv_skip_filters(bs))); |
8306 | } | |
0bc329fb HR |
8307 | |
8308 | /** | |
8309 | * Check whether [offset, offset + bytes) overlaps with the cached | |
8310 | * block-status data region. | |
8311 | * | |
8312 | * If so, and @pnum is not NULL, set *pnum to `bsc.data_end - offset`, | |
8313 | * which is what bdrv_bsc_is_data()'s interface needs. | |
8314 | * Otherwise, *pnum is not touched. | |
8315 | */ | |
8316 | static bool bdrv_bsc_range_overlaps_locked(BlockDriverState *bs, | |
8317 | int64_t offset, int64_t bytes, | |
8318 | int64_t *pnum) | |
8319 | { | |
8320 | BdrvBlockStatusCache *bsc = qatomic_rcu_read(&bs->block_status_cache); | |
8321 | bool overlaps; | |
8322 | ||
8323 | overlaps = | |
8324 | qatomic_read(&bsc->valid) && | |
8325 | ranges_overlap(offset, bytes, bsc->data_start, | |
8326 | bsc->data_end - bsc->data_start); | |
8327 | ||
8328 | if (overlaps && pnum) { | |
8329 | *pnum = bsc->data_end - offset; | |
8330 | } | |
8331 | ||
8332 | return overlaps; | |
8333 | } | |
8334 | ||
8335 | /** | |
8336 | * See block_int.h for this function's documentation. | |
8337 | */ | |
8338 | bool bdrv_bsc_is_data(BlockDriverState *bs, int64_t offset, int64_t *pnum) | |
8339 | { | |
967d7905 | 8340 | IO_CODE(); |
0bc329fb | 8341 | RCU_READ_LOCK_GUARD(); |
0bc329fb HR |
8342 | return bdrv_bsc_range_overlaps_locked(bs, offset, 1, pnum); |
8343 | } | |
8344 | ||
8345 | /** | |
8346 | * See block_int.h for this function's documentation. | |
8347 | */ | |
8348 | void bdrv_bsc_invalidate_range(BlockDriverState *bs, | |
8349 | int64_t offset, int64_t bytes) | |
8350 | { | |
967d7905 | 8351 | IO_CODE(); |
0bc329fb HR |
8352 | RCU_READ_LOCK_GUARD(); |
8353 | ||
8354 | if (bdrv_bsc_range_overlaps_locked(bs, offset, bytes, NULL)) { | |
8355 | qatomic_set(&bs->block_status_cache->valid, false); | |
8356 | } | |
8357 | } | |
8358 | ||
8359 | /** | |
8360 | * See block_int.h for this function's documentation. | |
8361 | */ | |
8362 | void bdrv_bsc_fill(BlockDriverState *bs, int64_t offset, int64_t bytes) | |
8363 | { | |
8364 | BdrvBlockStatusCache *new_bsc = g_new(BdrvBlockStatusCache, 1); | |
8365 | BdrvBlockStatusCache *old_bsc; | |
967d7905 | 8366 | IO_CODE(); |
0bc329fb HR |
8367 | |
8368 | *new_bsc = (BdrvBlockStatusCache) { | |
8369 | .valid = true, | |
8370 | .data_start = offset, | |
8371 | .data_end = offset + bytes, | |
8372 | }; | |
8373 | ||
8374 | QEMU_LOCK_GUARD(&bs->bsc_modify_lock); | |
8375 | ||
8376 | old_bsc = qatomic_rcu_read(&bs->block_status_cache); | |
8377 | qatomic_rcu_set(&bs->block_status_cache, new_bsc); | |
8378 | if (old_bsc) { | |
8379 | g_free_rcu(old_bsc, rcu); | |
8380 | } | |
8381 | } |