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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 |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
83c9089e | 27 | #include "monitor/monitor.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
1de7afc9 | 30 | #include "qemu/module.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qjson.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
b2023818 | 35 | #include "qmp-commands.h" |
1de7afc9 | 36 | #include "qemu/timer.h" |
fc01f7e7 | 37 | |
71e72a19 | 38 | #ifdef CONFIG_BSD |
7674e7bf FB |
39 | #include <sys/types.h> |
40 | #include <sys/stat.h> | |
41 | #include <sys/ioctl.h> | |
72cf2d4f | 42 | #include <sys/queue.h> |
c5e97233 | 43 | #ifndef __DragonFly__ |
7674e7bf FB |
44 | #include <sys/disk.h> |
45 | #endif | |
c5e97233 | 46 | #endif |
7674e7bf | 47 | |
49dc768d AL |
48 | #ifdef _WIN32 |
49 | #include <windows.h> | |
50 | #endif | |
51 | ||
1c9805a3 SH |
52 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
53 | ||
470c0504 SH |
54 | typedef enum { |
55 | BDRV_REQ_COPY_ON_READ = 0x1, | |
f08f2dda | 56 | BDRV_REQ_ZERO_WRITE = 0x2, |
470c0504 SH |
57 | } BdrvRequestFlags; |
58 | ||
7d4b4ba5 | 59 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
60 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
61 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 62 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
63 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
64 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 65 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
66 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
67 | int64_t sector_num, int nb_sectors, | |
68 | QEMUIOVector *iov); | |
69 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
70 | int64_t sector_num, int nb_sectors, | |
71 | QEMUIOVector *iov); | |
c5fbe571 | 72 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
73 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
74 | BdrvRequestFlags flags); | |
1c9805a3 | 75 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
f08f2dda SH |
76 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
77 | BdrvRequestFlags flags); | |
b2a61371 SH |
78 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
79 | int64_t sector_num, | |
80 | QEMUIOVector *qiov, | |
81 | int nb_sectors, | |
82 | BlockDriverCompletionFunc *cb, | |
83 | void *opaque, | |
8c5873d6 | 84 | bool is_write); |
b2a61371 | 85 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 KW |
86 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
87 | int64_t sector_num, int nb_sectors); | |
ec530c81 | 88 | |
98f90dba ZYW |
89 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
90 | bool is_write, double elapsed_time, uint64_t *wait); | |
91 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
92 | double elapsed_time, uint64_t *wait); | |
93 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
94 | bool is_write, int64_t *wait); | |
95 | ||
1b7bdbc1 SH |
96 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
97 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 98 | |
8a22f02a SH |
99 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
100 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 101 | |
f9092b10 MA |
102 | /* The device to use for VM snapshots */ |
103 | static BlockDriverState *bs_snapshots; | |
104 | ||
eb852011 MA |
105 | /* If non-zero, use only whitelisted block drivers */ |
106 | static int use_bdrv_whitelist; | |
107 | ||
9e0b22f4 SH |
108 | #ifdef _WIN32 |
109 | static int is_windows_drive_prefix(const char *filename) | |
110 | { | |
111 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
112 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
113 | filename[1] == ':'); | |
114 | } | |
115 | ||
116 | int is_windows_drive(const char *filename) | |
117 | { | |
118 | if (is_windows_drive_prefix(filename) && | |
119 | filename[2] == '\0') | |
120 | return 1; | |
121 | if (strstart(filename, "\\\\.\\", NULL) || | |
122 | strstart(filename, "//./", NULL)) | |
123 | return 1; | |
124 | return 0; | |
125 | } | |
126 | #endif | |
127 | ||
0563e191 | 128 | /* throttling disk I/O limits */ |
98f90dba ZYW |
129 | void bdrv_io_limits_disable(BlockDriverState *bs) |
130 | { | |
131 | bs->io_limits_enabled = false; | |
132 | ||
133 | while (qemu_co_queue_next(&bs->throttled_reqs)); | |
134 | ||
135 | if (bs->block_timer) { | |
136 | qemu_del_timer(bs->block_timer); | |
137 | qemu_free_timer(bs->block_timer); | |
138 | bs->block_timer = NULL; | |
139 | } | |
140 | ||
141 | bs->slice_start = 0; | |
142 | bs->slice_end = 0; | |
143 | bs->slice_time = 0; | |
144 | memset(&bs->io_base, 0, sizeof(bs->io_base)); | |
145 | } | |
146 | ||
0563e191 ZYW |
147 | static void bdrv_block_timer(void *opaque) |
148 | { | |
149 | BlockDriverState *bs = opaque; | |
150 | ||
151 | qemu_co_queue_next(&bs->throttled_reqs); | |
152 | } | |
153 | ||
154 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
155 | { | |
156 | qemu_co_queue_init(&bs->throttled_reqs); | |
157 | bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); | |
0563e191 ZYW |
158 | bs->io_limits_enabled = true; |
159 | } | |
160 | ||
161 | bool bdrv_io_limits_enabled(BlockDriverState *bs) | |
162 | { | |
163 | BlockIOLimit *io_limits = &bs->io_limits; | |
164 | return io_limits->bps[BLOCK_IO_LIMIT_READ] | |
165 | || io_limits->bps[BLOCK_IO_LIMIT_WRITE] | |
166 | || io_limits->bps[BLOCK_IO_LIMIT_TOTAL] | |
167 | || io_limits->iops[BLOCK_IO_LIMIT_READ] | |
168 | || io_limits->iops[BLOCK_IO_LIMIT_WRITE] | |
169 | || io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; | |
170 | } | |
171 | ||
98f90dba ZYW |
172 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
173 | bool is_write, int nb_sectors) | |
174 | { | |
175 | int64_t wait_time = -1; | |
176 | ||
177 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
178 | qemu_co_queue_wait(&bs->throttled_reqs); | |
179 | } | |
180 | ||
181 | /* In fact, we hope to keep each request's timing, in FIFO mode. The next | |
182 | * throttled requests will not be dequeued until the current request is | |
183 | * allowed to be serviced. So if the current request still exceeds the | |
184 | * limits, it will be inserted to the head. All requests followed it will | |
185 | * be still in throttled_reqs queue. | |
186 | */ | |
187 | ||
188 | while (bdrv_exceed_io_limits(bs, nb_sectors, is_write, &wait_time)) { | |
189 | qemu_mod_timer(bs->block_timer, | |
190 | wait_time + qemu_get_clock_ns(vm_clock)); | |
191 | qemu_co_queue_wait_insert_head(&bs->throttled_reqs); | |
192 | } | |
193 | ||
194 | qemu_co_queue_next(&bs->throttled_reqs); | |
195 | } | |
196 | ||
9e0b22f4 SH |
197 | /* check if the path starts with "<protocol>:" */ |
198 | static int path_has_protocol(const char *path) | |
199 | { | |
947995c0 PB |
200 | const char *p; |
201 | ||
9e0b22f4 SH |
202 | #ifdef _WIN32 |
203 | if (is_windows_drive(path) || | |
204 | is_windows_drive_prefix(path)) { | |
205 | return 0; | |
206 | } | |
947995c0 PB |
207 | p = path + strcspn(path, ":/\\"); |
208 | #else | |
209 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
210 | #endif |
211 | ||
947995c0 | 212 | return *p == ':'; |
9e0b22f4 SH |
213 | } |
214 | ||
83f64091 | 215 | int path_is_absolute(const char *path) |
3b0d4f61 | 216 | { |
21664424 FB |
217 | #ifdef _WIN32 |
218 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 219 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 220 | return 1; |
f53f4da9 PB |
221 | } |
222 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 223 | #else |
f53f4da9 | 224 | return (*path == '/'); |
3b9f94e1 | 225 | #endif |
3b0d4f61 FB |
226 | } |
227 | ||
83f64091 FB |
228 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
229 | path to it by considering it is relative to base_path. URL are | |
230 | supported. */ | |
231 | void path_combine(char *dest, int dest_size, | |
232 | const char *base_path, | |
233 | const char *filename) | |
3b0d4f61 | 234 | { |
83f64091 FB |
235 | const char *p, *p1; |
236 | int len; | |
237 | ||
238 | if (dest_size <= 0) | |
239 | return; | |
240 | if (path_is_absolute(filename)) { | |
241 | pstrcpy(dest, dest_size, filename); | |
242 | } else { | |
243 | p = strchr(base_path, ':'); | |
244 | if (p) | |
245 | p++; | |
246 | else | |
247 | p = base_path; | |
3b9f94e1 FB |
248 | p1 = strrchr(base_path, '/'); |
249 | #ifdef _WIN32 | |
250 | { | |
251 | const char *p2; | |
252 | p2 = strrchr(base_path, '\\'); | |
253 | if (!p1 || p2 > p1) | |
254 | p1 = p2; | |
255 | } | |
256 | #endif | |
83f64091 FB |
257 | if (p1) |
258 | p1++; | |
259 | else | |
260 | p1 = base_path; | |
261 | if (p1 > p) | |
262 | p = p1; | |
263 | len = p - base_path; | |
264 | if (len > dest_size - 1) | |
265 | len = dest_size - 1; | |
266 | memcpy(dest, base_path, len); | |
267 | dest[len] = '\0'; | |
268 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 269 | } |
3b0d4f61 FB |
270 | } |
271 | ||
dc5a1371 PB |
272 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
273 | { | |
274 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
275 | pstrcpy(dest, sz, bs->backing_file); | |
276 | } else { | |
277 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
278 | } | |
279 | } | |
280 | ||
5efa9d5a | 281 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 282 | { |
8c5873d6 SH |
283 | /* Block drivers without coroutine functions need emulation */ |
284 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
285 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
286 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
287 | ||
f8c35c1d SH |
288 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
289 | * the block driver lacks aio we need to emulate that too. | |
290 | */ | |
f9f05dc5 KW |
291 | if (!bdrv->bdrv_aio_readv) { |
292 | /* add AIO emulation layer */ | |
293 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
294 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 295 | } |
83f64091 | 296 | } |
b2e12bc6 | 297 | |
8a22f02a | 298 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 299 | } |
b338082b FB |
300 | |
301 | /* create a new block device (by default it is empty) */ | |
302 | BlockDriverState *bdrv_new(const char *device_name) | |
303 | { | |
1b7bdbc1 | 304 | BlockDriverState *bs; |
b338082b | 305 | |
7267c094 | 306 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 307 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 308 | if (device_name[0] != '\0') { |
1b7bdbc1 | 309 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 310 | } |
28a7282a | 311 | bdrv_iostatus_disable(bs); |
d7d512f6 PB |
312 | notifier_list_init(&bs->close_notifiers); |
313 | ||
b338082b FB |
314 | return bs; |
315 | } | |
316 | ||
d7d512f6 PB |
317 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
318 | { | |
319 | notifier_list_add(&bs->close_notifiers, notify); | |
320 | } | |
321 | ||
ea2384d3 FB |
322 | BlockDriver *bdrv_find_format(const char *format_name) |
323 | { | |
324 | BlockDriver *drv1; | |
8a22f02a SH |
325 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
326 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 327 | return drv1; |
8a22f02a | 328 | } |
ea2384d3 FB |
329 | } |
330 | return NULL; | |
331 | } | |
332 | ||
eb852011 MA |
333 | static int bdrv_is_whitelisted(BlockDriver *drv) |
334 | { | |
335 | static const char *whitelist[] = { | |
336 | CONFIG_BDRV_WHITELIST | |
337 | }; | |
338 | const char **p; | |
339 | ||
340 | if (!whitelist[0]) | |
341 | return 1; /* no whitelist, anything goes */ | |
342 | ||
343 | for (p = whitelist; *p; p++) { | |
344 | if (!strcmp(drv->format_name, *p)) { | |
345 | return 1; | |
346 | } | |
347 | } | |
348 | return 0; | |
349 | } | |
350 | ||
351 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
352 | { | |
353 | BlockDriver *drv = bdrv_find_format(format_name); | |
354 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
355 | } | |
356 | ||
5b7e1542 ZYW |
357 | typedef struct CreateCo { |
358 | BlockDriver *drv; | |
359 | char *filename; | |
360 | QEMUOptionParameter *options; | |
361 | int ret; | |
362 | } CreateCo; | |
363 | ||
364 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
365 | { | |
366 | CreateCo *cco = opaque; | |
367 | assert(cco->drv); | |
368 | ||
369 | cco->ret = cco->drv->bdrv_create(cco->filename, cco->options); | |
370 | } | |
371 | ||
0e7e1989 KW |
372 | int bdrv_create(BlockDriver *drv, const char* filename, |
373 | QEMUOptionParameter *options) | |
ea2384d3 | 374 | { |
5b7e1542 ZYW |
375 | int ret; |
376 | ||
377 | Coroutine *co; | |
378 | CreateCo cco = { | |
379 | .drv = drv, | |
380 | .filename = g_strdup(filename), | |
381 | .options = options, | |
382 | .ret = NOT_DONE, | |
383 | }; | |
384 | ||
385 | if (!drv->bdrv_create) { | |
80168bff LC |
386 | ret = -ENOTSUP; |
387 | goto out; | |
5b7e1542 ZYW |
388 | } |
389 | ||
390 | if (qemu_in_coroutine()) { | |
391 | /* Fast-path if already in coroutine context */ | |
392 | bdrv_create_co_entry(&cco); | |
393 | } else { | |
394 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
395 | qemu_coroutine_enter(co, &cco); | |
396 | while (cco.ret == NOT_DONE) { | |
397 | qemu_aio_wait(); | |
398 | } | |
399 | } | |
400 | ||
401 | ret = cco.ret; | |
0e7e1989 | 402 | |
80168bff LC |
403 | out: |
404 | g_free(cco.filename); | |
5b7e1542 | 405 | return ret; |
ea2384d3 FB |
406 | } |
407 | ||
84a12e66 CH |
408 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
409 | { | |
410 | BlockDriver *drv; | |
411 | ||
b50cbabc | 412 | drv = bdrv_find_protocol(filename); |
84a12e66 | 413 | if (drv == NULL) { |
16905d71 | 414 | return -ENOENT; |
84a12e66 CH |
415 | } |
416 | ||
417 | return bdrv_create(drv, filename, options); | |
418 | } | |
419 | ||
eba25057 JM |
420 | /* |
421 | * Create a uniquely-named empty temporary file. | |
422 | * Return 0 upon success, otherwise a negative errno value. | |
423 | */ | |
424 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 425 | { |
eba25057 | 426 | #ifdef _WIN32 |
3b9f94e1 | 427 | char temp_dir[MAX_PATH]; |
eba25057 JM |
428 | /* GetTempFileName requires that its output buffer (4th param) |
429 | have length MAX_PATH or greater. */ | |
430 | assert(size >= MAX_PATH); | |
431 | return (GetTempPath(MAX_PATH, temp_dir) | |
432 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
433 | ? 0 : -GetLastError()); | |
d5249393 | 434 | #else |
67b915a5 | 435 | int fd; |
7ccfb2eb | 436 | const char *tmpdir; |
0badc1ee AJ |
437 | tmpdir = getenv("TMPDIR"); |
438 | if (!tmpdir) | |
439 | tmpdir = "/tmp"; | |
eba25057 JM |
440 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
441 | return -EOVERFLOW; | |
442 | } | |
ea2384d3 | 443 | fd = mkstemp(filename); |
fe235a06 DH |
444 | if (fd < 0) { |
445 | return -errno; | |
446 | } | |
447 | if (close(fd) != 0) { | |
448 | unlink(filename); | |
eba25057 JM |
449 | return -errno; |
450 | } | |
451 | return 0; | |
d5249393 | 452 | #endif |
eba25057 | 453 | } |
fc01f7e7 | 454 | |
84a12e66 CH |
455 | /* |
456 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
457 | * recognized as a host CDROM. | |
458 | */ | |
459 | static BlockDriver *find_hdev_driver(const char *filename) | |
460 | { | |
461 | int score_max = 0, score; | |
462 | BlockDriver *drv = NULL, *d; | |
463 | ||
464 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
465 | if (d->bdrv_probe_device) { | |
466 | score = d->bdrv_probe_device(filename); | |
467 | if (score > score_max) { | |
468 | score_max = score; | |
469 | drv = d; | |
470 | } | |
471 | } | |
472 | } | |
473 | ||
474 | return drv; | |
475 | } | |
476 | ||
b50cbabc | 477 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
478 | { |
479 | BlockDriver *drv1; | |
480 | char protocol[128]; | |
1cec71e3 | 481 | int len; |
83f64091 | 482 | const char *p; |
19cb3738 | 483 | |
66f82cee KW |
484 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
485 | ||
39508e7a CH |
486 | /* |
487 | * XXX(hch): we really should not let host device detection | |
488 | * override an explicit protocol specification, but moving this | |
489 | * later breaks access to device names with colons in them. | |
490 | * Thanks to the brain-dead persistent naming schemes on udev- | |
491 | * based Linux systems those actually are quite common. | |
492 | */ | |
493 | drv1 = find_hdev_driver(filename); | |
494 | if (drv1) { | |
495 | return drv1; | |
496 | } | |
497 | ||
9e0b22f4 | 498 | if (!path_has_protocol(filename)) { |
39508e7a | 499 | return bdrv_find_format("file"); |
84a12e66 | 500 | } |
9e0b22f4 SH |
501 | p = strchr(filename, ':'); |
502 | assert(p != NULL); | |
1cec71e3 AL |
503 | len = p - filename; |
504 | if (len > sizeof(protocol) - 1) | |
505 | len = sizeof(protocol) - 1; | |
506 | memcpy(protocol, filename, len); | |
507 | protocol[len] = '\0'; | |
8a22f02a | 508 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 509 | if (drv1->protocol_name && |
8a22f02a | 510 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 511 | return drv1; |
8a22f02a | 512 | } |
83f64091 FB |
513 | } |
514 | return NULL; | |
515 | } | |
516 | ||
f500a6d3 KW |
517 | static int find_image_format(BlockDriverState *bs, const char *filename, |
518 | BlockDriver **pdrv) | |
f3a5d3f8 | 519 | { |
f500a6d3 | 520 | int score, score_max; |
f3a5d3f8 CH |
521 | BlockDriver *drv1, *drv; |
522 | uint8_t buf[2048]; | |
f500a6d3 | 523 | int ret = 0; |
f8ea0b00 | 524 | |
08a00559 | 525 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 526 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
527 | drv = bdrv_find_format("raw"); |
528 | if (!drv) { | |
529 | ret = -ENOENT; | |
530 | } | |
531 | *pdrv = drv; | |
532 | return ret; | |
1a396859 | 533 | } |
f8ea0b00 | 534 | |
83f64091 | 535 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 536 | if (ret < 0) { |
c98ac35d SW |
537 | *pdrv = NULL; |
538 | return ret; | |
83f64091 FB |
539 | } |
540 | ||
ea2384d3 | 541 | score_max = 0; |
84a12e66 | 542 | drv = NULL; |
8a22f02a | 543 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
544 | if (drv1->bdrv_probe) { |
545 | score = drv1->bdrv_probe(buf, ret, filename); | |
546 | if (score > score_max) { | |
547 | score_max = score; | |
548 | drv = drv1; | |
549 | } | |
0849bf08 | 550 | } |
fc01f7e7 | 551 | } |
c98ac35d SW |
552 | if (!drv) { |
553 | ret = -ENOENT; | |
554 | } | |
555 | *pdrv = drv; | |
556 | return ret; | |
ea2384d3 FB |
557 | } |
558 | ||
51762288 SH |
559 | /** |
560 | * Set the current 'total_sectors' value | |
561 | */ | |
562 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
563 | { | |
564 | BlockDriver *drv = bs->drv; | |
565 | ||
396759ad NB |
566 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
567 | if (bs->sg) | |
568 | return 0; | |
569 | ||
51762288 SH |
570 | /* query actual device if possible, otherwise just trust the hint */ |
571 | if (drv->bdrv_getlength) { | |
572 | int64_t length = drv->bdrv_getlength(bs); | |
573 | if (length < 0) { | |
574 | return length; | |
575 | } | |
576 | hint = length >> BDRV_SECTOR_BITS; | |
577 | } | |
578 | ||
579 | bs->total_sectors = hint; | |
580 | return 0; | |
581 | } | |
582 | ||
c3993cdc SH |
583 | /** |
584 | * Set open flags for a given cache mode | |
585 | * | |
586 | * Return 0 on success, -1 if the cache mode was invalid. | |
587 | */ | |
588 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
589 | { | |
590 | *flags &= ~BDRV_O_CACHE_MASK; | |
591 | ||
592 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
593 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
594 | } else if (!strcmp(mode, "directsync")) { |
595 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
596 | } else if (!strcmp(mode, "writeback")) { |
597 | *flags |= BDRV_O_CACHE_WB; | |
598 | } else if (!strcmp(mode, "unsafe")) { | |
599 | *flags |= BDRV_O_CACHE_WB; | |
600 | *flags |= BDRV_O_NO_FLUSH; | |
601 | } else if (!strcmp(mode, "writethrough")) { | |
602 | /* this is the default */ | |
603 | } else { | |
604 | return -1; | |
605 | } | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
53fec9d3 SH |
610 | /** |
611 | * The copy-on-read flag is actually a reference count so multiple users may | |
612 | * use the feature without worrying about clobbering its previous state. | |
613 | * Copy-on-read stays enabled until all users have called to disable it. | |
614 | */ | |
615 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
616 | { | |
617 | bs->copy_on_read++; | |
618 | } | |
619 | ||
620 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
621 | { | |
622 | assert(bs->copy_on_read > 0); | |
623 | bs->copy_on_read--; | |
624 | } | |
625 | ||
7b272452 KW |
626 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
627 | { | |
628 | int open_flags = flags | BDRV_O_CACHE_WB; | |
629 | ||
630 | /* | |
631 | * Clear flags that are internal to the block layer before opening the | |
632 | * image. | |
633 | */ | |
634 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
635 | ||
636 | /* | |
637 | * Snapshots should be writable. | |
638 | */ | |
639 | if (bs->is_temporary) { | |
640 | open_flags |= BDRV_O_RDWR; | |
641 | } | |
642 | ||
643 | return open_flags; | |
644 | } | |
645 | ||
57915332 KW |
646 | /* |
647 | * Common part for opening disk images and files | |
648 | */ | |
f500a6d3 KW |
649 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
650 | const char *filename, | |
57915332 KW |
651 | int flags, BlockDriver *drv) |
652 | { | |
653 | int ret, open_flags; | |
654 | ||
655 | assert(drv != NULL); | |
6405875c | 656 | assert(bs->file == NULL); |
57915332 | 657 | |
28dcee10 SH |
658 | trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
659 | ||
57915332 | 660 | bs->open_flags = flags; |
57915332 KW |
661 | bs->buffer_alignment = 512; |
662 | ||
53fec9d3 SH |
663 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
664 | if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) { | |
665 | bdrv_enable_copy_on_read(bs); | |
666 | } | |
667 | ||
57915332 KW |
668 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
669 | ||
670 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
671 | return -ENOTSUP; | |
672 | } | |
673 | ||
674 | bs->drv = drv; | |
7267c094 | 675 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 676 | |
03f541bd | 677 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
7b272452 | 678 | open_flags = bdrv_open_flags(bs, flags); |
57915332 | 679 | |
be028adc | 680 | bs->read_only = !(open_flags & BDRV_O_RDWR); |
e7c63796 | 681 | |
66f82cee KW |
682 | /* Open the image, either directly or using a protocol */ |
683 | if (drv->bdrv_file_open) { | |
f500a6d3 KW |
684 | if (file != NULL) { |
685 | bdrv_swap(file, bs); | |
686 | ret = 0; | |
687 | } else { | |
688 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
66f82cee | 689 | } |
f500a6d3 KW |
690 | } else { |
691 | assert(file != NULL); | |
692 | bs->file = file; | |
693 | ret = drv->bdrv_open(bs, open_flags); | |
66f82cee KW |
694 | } |
695 | ||
57915332 KW |
696 | if (ret < 0) { |
697 | goto free_and_fail; | |
698 | } | |
699 | ||
51762288 SH |
700 | ret = refresh_total_sectors(bs, bs->total_sectors); |
701 | if (ret < 0) { | |
702 | goto free_and_fail; | |
57915332 | 703 | } |
51762288 | 704 | |
57915332 KW |
705 | #ifndef _WIN32 |
706 | if (bs->is_temporary) { | |
707 | unlink(filename); | |
708 | } | |
709 | #endif | |
710 | return 0; | |
711 | ||
712 | free_and_fail: | |
f500a6d3 | 713 | bs->file = NULL; |
7267c094 | 714 | g_free(bs->opaque); |
57915332 KW |
715 | bs->opaque = NULL; |
716 | bs->drv = NULL; | |
717 | return ret; | |
718 | } | |
719 | ||
b6ce07aa KW |
720 | /* |
721 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
722 | */ | |
83f64091 | 723 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 724 | { |
83f64091 | 725 | BlockDriverState *bs; |
6db95603 | 726 | BlockDriver *drv; |
83f64091 FB |
727 | int ret; |
728 | ||
b50cbabc | 729 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
730 | if (!drv) { |
731 | return -ENOENT; | |
732 | } | |
733 | ||
83f64091 | 734 | bs = bdrv_new(""); |
f500a6d3 | 735 | ret = bdrv_open_common(bs, NULL, filename, flags, drv); |
83f64091 FB |
736 | if (ret < 0) { |
737 | bdrv_delete(bs); | |
738 | return ret; | |
3b0d4f61 | 739 | } |
71d0770c | 740 | bs->growable = 1; |
83f64091 FB |
741 | *pbs = bs; |
742 | return 0; | |
743 | } | |
744 | ||
9156df12 PB |
745 | int bdrv_open_backing_file(BlockDriverState *bs) |
746 | { | |
747 | char backing_filename[PATH_MAX]; | |
748 | int back_flags, ret; | |
749 | BlockDriver *back_drv = NULL; | |
750 | ||
751 | if (bs->backing_hd != NULL) { | |
752 | return 0; | |
753 | } | |
754 | ||
755 | bs->open_flags &= ~BDRV_O_NO_BACKING; | |
756 | if (bs->backing_file[0] == '\0') { | |
757 | return 0; | |
758 | } | |
759 | ||
760 | bs->backing_hd = bdrv_new(""); | |
761 | bdrv_get_full_backing_filename(bs, backing_filename, | |
762 | sizeof(backing_filename)); | |
763 | ||
764 | if (bs->backing_format[0] != '\0') { | |
765 | back_drv = bdrv_find_format(bs->backing_format); | |
766 | } | |
767 | ||
768 | /* backing files always opened read-only */ | |
769 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT); | |
770 | ||
771 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
772 | if (ret < 0) { | |
773 | bdrv_delete(bs->backing_hd); | |
774 | bs->backing_hd = NULL; | |
775 | bs->open_flags |= BDRV_O_NO_BACKING; | |
776 | return ret; | |
777 | } | |
778 | return 0; | |
779 | } | |
780 | ||
b6ce07aa KW |
781 | /* |
782 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
783 | */ | |
d6e9098e KW |
784 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
785 | BlockDriver *drv) | |
ea2384d3 | 786 | { |
b6ce07aa | 787 | int ret; |
89c9bc3d SW |
788 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
789 | char tmp_filename[PATH_MAX + 1]; | |
f500a6d3 | 790 | BlockDriverState *file = NULL; |
712e7874 | 791 | |
83f64091 | 792 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
793 | BlockDriverState *bs1; |
794 | int64_t total_size; | |
7c96d46e | 795 | int is_protocol = 0; |
91a073a9 KW |
796 | BlockDriver *bdrv_qcow2; |
797 | QEMUOptionParameter *options; | |
b6ce07aa | 798 | char backing_filename[PATH_MAX]; |
3b46e624 | 799 | |
ea2384d3 FB |
800 | /* if snapshot, we create a temporary backing file and open it |
801 | instead of opening 'filename' directly */ | |
33e3963e | 802 | |
ea2384d3 FB |
803 | /* if there is a backing file, use it */ |
804 | bs1 = bdrv_new(""); | |
d6e9098e | 805 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 806 | if (ret < 0) { |
ea2384d3 | 807 | bdrv_delete(bs1); |
51d7c00c | 808 | return ret; |
ea2384d3 | 809 | } |
3e82990b | 810 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
811 | |
812 | if (bs1->drv && bs1->drv->protocol_name) | |
813 | is_protocol = 1; | |
814 | ||
ea2384d3 | 815 | bdrv_delete(bs1); |
3b46e624 | 816 | |
eba25057 JM |
817 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
818 | if (ret < 0) { | |
819 | return ret; | |
820 | } | |
7c96d46e AL |
821 | |
822 | /* Real path is meaningless for protocols */ | |
823 | if (is_protocol) | |
824 | snprintf(backing_filename, sizeof(backing_filename), | |
825 | "%s", filename); | |
114cdfa9 KS |
826 | else if (!realpath(filename, backing_filename)) |
827 | return -errno; | |
7c96d46e | 828 | |
91a073a9 KW |
829 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
830 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
831 | ||
3e82990b | 832 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
833 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
834 | if (drv) { | |
835 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
836 | drv->format_name); | |
837 | } | |
838 | ||
839 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 840 | free_option_parameters(options); |
51d7c00c AL |
841 | if (ret < 0) { |
842 | return ret; | |
ea2384d3 | 843 | } |
91a073a9 | 844 | |
ea2384d3 | 845 | filename = tmp_filename; |
91a073a9 | 846 | drv = bdrv_qcow2; |
ea2384d3 FB |
847 | bs->is_temporary = 1; |
848 | } | |
712e7874 | 849 | |
f500a6d3 KW |
850 | /* Open image file without format layer */ |
851 | if (flags & BDRV_O_RDWR) { | |
852 | flags |= BDRV_O_ALLOW_RDWR; | |
853 | } | |
854 | ||
855 | ret = bdrv_file_open(&file, filename, bdrv_open_flags(bs, flags)); | |
856 | if (ret < 0) { | |
857 | return ret; | |
858 | } | |
859 | ||
b6ce07aa | 860 | /* Find the right image format driver */ |
6db95603 | 861 | if (!drv) { |
f500a6d3 | 862 | ret = find_image_format(file, filename, &drv); |
51d7c00c | 863 | } |
6987307c | 864 | |
51d7c00c | 865 | if (!drv) { |
51d7c00c | 866 | goto unlink_and_fail; |
ea2384d3 | 867 | } |
b6ce07aa KW |
868 | |
869 | /* Open the image */ | |
f500a6d3 | 870 | ret = bdrv_open_common(bs, file, filename, flags, drv); |
b6ce07aa | 871 | if (ret < 0) { |
6987307c CH |
872 | goto unlink_and_fail; |
873 | } | |
874 | ||
f500a6d3 KW |
875 | if (bs->file != file) { |
876 | bdrv_delete(file); | |
877 | file = NULL; | |
878 | } | |
879 | ||
b6ce07aa | 880 | /* If there is a backing file, use it */ |
9156df12 PB |
881 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
882 | ret = bdrv_open_backing_file(bs); | |
b6ce07aa KW |
883 | if (ret < 0) { |
884 | bdrv_close(bs); | |
885 | return ret; | |
886 | } | |
b6ce07aa KW |
887 | } |
888 | ||
889 | if (!bdrv_key_required(bs)) { | |
7d4b4ba5 | 890 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
891 | } |
892 | ||
98f90dba ZYW |
893 | /* throttling disk I/O limits */ |
894 | if (bs->io_limits_enabled) { | |
895 | bdrv_io_limits_enable(bs); | |
896 | } | |
897 | ||
b6ce07aa KW |
898 | return 0; |
899 | ||
900 | unlink_and_fail: | |
f500a6d3 KW |
901 | if (file != NULL) { |
902 | bdrv_delete(file); | |
903 | } | |
b6ce07aa KW |
904 | if (bs->is_temporary) { |
905 | unlink(filename); | |
906 | } | |
907 | return ret; | |
908 | } | |
909 | ||
e971aa12 JC |
910 | typedef struct BlockReopenQueueEntry { |
911 | bool prepared; | |
912 | BDRVReopenState state; | |
913 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
914 | } BlockReopenQueueEntry; | |
915 | ||
916 | /* | |
917 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
918 | * reopen of multiple devices. | |
919 | * | |
920 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
921 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
922 | * be created and initialized. This newly created BlockReopenQueue should be | |
923 | * passed back in for subsequent calls that are intended to be of the same | |
924 | * atomic 'set'. | |
925 | * | |
926 | * bs is the BlockDriverState to add to the reopen queue. | |
927 | * | |
928 | * flags contains the open flags for the associated bs | |
929 | * | |
930 | * returns a pointer to bs_queue, which is either the newly allocated | |
931 | * bs_queue, or the existing bs_queue being used. | |
932 | * | |
933 | */ | |
934 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
935 | BlockDriverState *bs, int flags) | |
936 | { | |
937 | assert(bs != NULL); | |
938 | ||
939 | BlockReopenQueueEntry *bs_entry; | |
940 | if (bs_queue == NULL) { | |
941 | bs_queue = g_new0(BlockReopenQueue, 1); | |
942 | QSIMPLEQ_INIT(bs_queue); | |
943 | } | |
944 | ||
945 | if (bs->file) { | |
946 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
947 | } | |
948 | ||
949 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
950 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
951 | ||
952 | bs_entry->state.bs = bs; | |
953 | bs_entry->state.flags = flags; | |
954 | ||
955 | return bs_queue; | |
956 | } | |
957 | ||
958 | /* | |
959 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
960 | * | |
961 | * The queue passed in (bs_queue) must have been built up previous | |
962 | * via bdrv_reopen_queue(). | |
963 | * | |
964 | * Reopens all BDS specified in the queue, with the appropriate | |
965 | * flags. All devices are prepared for reopen, and failure of any | |
966 | * device will cause all device changes to be abandonded, and intermediate | |
967 | * data cleaned up. | |
968 | * | |
969 | * If all devices prepare successfully, then the changes are committed | |
970 | * to all devices. | |
971 | * | |
972 | */ | |
973 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
974 | { | |
975 | int ret = -1; | |
976 | BlockReopenQueueEntry *bs_entry, *next; | |
977 | Error *local_err = NULL; | |
978 | ||
979 | assert(bs_queue != NULL); | |
980 | ||
981 | bdrv_drain_all(); | |
982 | ||
983 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
984 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
985 | error_propagate(errp, local_err); | |
986 | goto cleanup; | |
987 | } | |
988 | bs_entry->prepared = true; | |
989 | } | |
990 | ||
991 | /* If we reach this point, we have success and just need to apply the | |
992 | * changes | |
993 | */ | |
994 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
995 | bdrv_reopen_commit(&bs_entry->state); | |
996 | } | |
997 | ||
998 | ret = 0; | |
999 | ||
1000 | cleanup: | |
1001 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1002 | if (ret && bs_entry->prepared) { | |
1003 | bdrv_reopen_abort(&bs_entry->state); | |
1004 | } | |
1005 | g_free(bs_entry); | |
1006 | } | |
1007 | g_free(bs_queue); | |
1008 | return ret; | |
1009 | } | |
1010 | ||
1011 | ||
1012 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1013 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1014 | { | |
1015 | int ret = -1; | |
1016 | Error *local_err = NULL; | |
1017 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1018 | ||
1019 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1020 | if (local_err != NULL) { | |
1021 | error_propagate(errp, local_err); | |
1022 | } | |
1023 | return ret; | |
1024 | } | |
1025 | ||
1026 | ||
1027 | /* | |
1028 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1029 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1030 | * the block driver layer .bdrv_reopen_prepare() | |
1031 | * | |
1032 | * bs is the BlockDriverState to reopen | |
1033 | * flags are the new open flags | |
1034 | * queue is the reopen queue | |
1035 | * | |
1036 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1037 | * as well. | |
1038 | * | |
1039 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1040 | * It is the responsibility of the caller to then call the abort() or | |
1041 | * commit() for any other BDS that have been left in a prepare() state | |
1042 | * | |
1043 | */ | |
1044 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1045 | Error **errp) | |
1046 | { | |
1047 | int ret = -1; | |
1048 | Error *local_err = NULL; | |
1049 | BlockDriver *drv; | |
1050 | ||
1051 | assert(reopen_state != NULL); | |
1052 | assert(reopen_state->bs->drv != NULL); | |
1053 | drv = reopen_state->bs->drv; | |
1054 | ||
1055 | /* if we are to stay read-only, do not allow permission change | |
1056 | * to r/w */ | |
1057 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1058 | reopen_state->flags & BDRV_O_RDWR) { | |
1059 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1060 | reopen_state->bs->device_name); | |
1061 | goto error; | |
1062 | } | |
1063 | ||
1064 | ||
1065 | ret = bdrv_flush(reopen_state->bs); | |
1066 | if (ret) { | |
1067 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1068 | strerror(-ret)); | |
1069 | goto error; | |
1070 | } | |
1071 | ||
1072 | if (drv->bdrv_reopen_prepare) { | |
1073 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1074 | if (ret) { | |
1075 | if (local_err != NULL) { | |
1076 | error_propagate(errp, local_err); | |
1077 | } else { | |
1078 | error_set(errp, QERR_OPEN_FILE_FAILED, | |
1079 | reopen_state->bs->filename); | |
1080 | } | |
1081 | goto error; | |
1082 | } | |
1083 | } else { | |
1084 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1085 | * handler for each supported drv. */ | |
1086 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1087 | drv->format_name, reopen_state->bs->device_name, | |
1088 | "reopening of file"); | |
1089 | ret = -1; | |
1090 | goto error; | |
1091 | } | |
1092 | ||
1093 | ret = 0; | |
1094 | ||
1095 | error: | |
1096 | return ret; | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1101 | * makes them final by swapping the staging BlockDriverState contents into | |
1102 | * the active BlockDriverState contents. | |
1103 | */ | |
1104 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1105 | { | |
1106 | BlockDriver *drv; | |
1107 | ||
1108 | assert(reopen_state != NULL); | |
1109 | drv = reopen_state->bs->drv; | |
1110 | assert(drv != NULL); | |
1111 | ||
1112 | /* If there are any driver level actions to take */ | |
1113 | if (drv->bdrv_reopen_commit) { | |
1114 | drv->bdrv_reopen_commit(reopen_state); | |
1115 | } | |
1116 | ||
1117 | /* set BDS specific flags now */ | |
1118 | reopen_state->bs->open_flags = reopen_state->flags; | |
1119 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1120 | BDRV_O_CACHE_WB); | |
1121 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Abort the reopen, and delete and free the staged changes in | |
1126 | * reopen_state | |
1127 | */ | |
1128 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1129 | { | |
1130 | BlockDriver *drv; | |
1131 | ||
1132 | assert(reopen_state != NULL); | |
1133 | drv = reopen_state->bs->drv; | |
1134 | assert(drv != NULL); | |
1135 | ||
1136 | if (drv->bdrv_reopen_abort) { | |
1137 | drv->bdrv_reopen_abort(reopen_state); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | ||
fc01f7e7 FB |
1142 | void bdrv_close(BlockDriverState *bs) |
1143 | { | |
80ccf93b | 1144 | bdrv_flush(bs); |
3cbc002c PB |
1145 | if (bs->job) { |
1146 | block_job_cancel_sync(bs->job); | |
1147 | } | |
1148 | bdrv_drain_all(); | |
d7d512f6 | 1149 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1150 | |
3cbc002c | 1151 | if (bs->drv) { |
f9092b10 MA |
1152 | if (bs == bs_snapshots) { |
1153 | bs_snapshots = NULL; | |
1154 | } | |
557df6ac | 1155 | if (bs->backing_hd) { |
ea2384d3 | 1156 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
1157 | bs->backing_hd = NULL; |
1158 | } | |
ea2384d3 | 1159 | bs->drv->bdrv_close(bs); |
7267c094 | 1160 | g_free(bs->opaque); |
ea2384d3 FB |
1161 | #ifdef _WIN32 |
1162 | if (bs->is_temporary) { | |
1163 | unlink(bs->filename); | |
1164 | } | |
67b915a5 | 1165 | #endif |
ea2384d3 FB |
1166 | bs->opaque = NULL; |
1167 | bs->drv = NULL; | |
53fec9d3 | 1168 | bs->copy_on_read = 0; |
a275fa42 PB |
1169 | bs->backing_file[0] = '\0'; |
1170 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1171 | bs->total_sectors = 0; |
1172 | bs->encrypted = 0; | |
1173 | bs->valid_key = 0; | |
1174 | bs->sg = 0; | |
1175 | bs->growable = 0; | |
b338082b | 1176 | |
66f82cee | 1177 | if (bs->file != NULL) { |
0ac9377d PB |
1178 | bdrv_delete(bs->file); |
1179 | bs->file = NULL; | |
66f82cee | 1180 | } |
b338082b | 1181 | } |
98f90dba | 1182 | |
9ca11154 PH |
1183 | bdrv_dev_change_media_cb(bs, false); |
1184 | ||
98f90dba ZYW |
1185 | /*throttling disk I/O limits*/ |
1186 | if (bs->io_limits_enabled) { | |
1187 | bdrv_io_limits_disable(bs); | |
1188 | } | |
b338082b FB |
1189 | } |
1190 | ||
2bc93fed MK |
1191 | void bdrv_close_all(void) |
1192 | { | |
1193 | BlockDriverState *bs; | |
1194 | ||
1195 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1196 | bdrv_close(bs); | |
1197 | } | |
1198 | } | |
1199 | ||
922453bc SH |
1200 | /* |
1201 | * Wait for pending requests to complete across all BlockDriverStates | |
1202 | * | |
1203 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1204 | * after calling this function. | |
4c355d53 ZYW |
1205 | * |
1206 | * Note that completion of an asynchronous I/O operation can trigger any | |
1207 | * number of other I/O operations on other devices---for example a coroutine | |
1208 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1209 | * coroutine is complete. Because of this, it is not possible to have a | |
1210 | * function to drain a single device's I/O queue. | |
922453bc SH |
1211 | */ |
1212 | void bdrv_drain_all(void) | |
1213 | { | |
1214 | BlockDriverState *bs; | |
4c355d53 ZYW |
1215 | bool busy; |
1216 | ||
1217 | do { | |
1218 | busy = qemu_aio_wait(); | |
922453bc | 1219 | |
4c355d53 ZYW |
1220 | /* FIXME: We do not have timer support here, so this is effectively |
1221 | * a busy wait. | |
1222 | */ | |
1223 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1224 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
1225 | qemu_co_queue_restart_all(&bs->throttled_reqs); | |
1226 | busy = true; | |
1227 | } | |
1228 | } | |
1229 | } while (busy); | |
922453bc SH |
1230 | |
1231 | /* If requests are still pending there is a bug somewhere */ | |
1232 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1233 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
1234 | assert(qemu_co_queue_empty(&bs->throttled_reqs)); | |
1235 | } | |
1236 | } | |
1237 | ||
d22b2f41 RH |
1238 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
1239 | Also, NULL terminate the device_name to prevent double remove */ | |
1240 | void bdrv_make_anon(BlockDriverState *bs) | |
1241 | { | |
1242 | if (bs->device_name[0] != '\0') { | |
1243 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
1244 | } | |
1245 | bs->device_name[0] = '\0'; | |
1246 | } | |
1247 | ||
e023b2e2 PB |
1248 | static void bdrv_rebind(BlockDriverState *bs) |
1249 | { | |
1250 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1251 | bs->drv->bdrv_rebind(bs); | |
1252 | } | |
1253 | } | |
1254 | ||
4ddc07ca PB |
1255 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1256 | BlockDriverState *bs_src) | |
8802d1fd | 1257 | { |
4ddc07ca PB |
1258 | /* move some fields that need to stay attached to the device */ |
1259 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1260 | |
1261 | /* dev info */ | |
4ddc07ca PB |
1262 | bs_dest->dev_ops = bs_src->dev_ops; |
1263 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1264 | bs_dest->dev = bs_src->dev; | |
1265 | bs_dest->buffer_alignment = bs_src->buffer_alignment; | |
1266 | bs_dest->copy_on_read = bs_src->copy_on_read; | |
8802d1fd | 1267 | |
4ddc07ca | 1268 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1269 | |
8802d1fd | 1270 | /* i/o timing parameters */ |
4ddc07ca PB |
1271 | bs_dest->slice_time = bs_src->slice_time; |
1272 | bs_dest->slice_start = bs_src->slice_start; | |
1273 | bs_dest->slice_end = bs_src->slice_end; | |
1274 | bs_dest->io_limits = bs_src->io_limits; | |
1275 | bs_dest->io_base = bs_src->io_base; | |
1276 | bs_dest->throttled_reqs = bs_src->throttled_reqs; | |
1277 | bs_dest->block_timer = bs_src->block_timer; | |
1278 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; | |
8802d1fd | 1279 | |
8802d1fd | 1280 | /* r/w error */ |
4ddc07ca PB |
1281 | bs_dest->on_read_error = bs_src->on_read_error; |
1282 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1283 | |
1284 | /* i/o status */ | |
4ddc07ca PB |
1285 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1286 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1287 | |
a9fc4408 | 1288 | /* dirty bitmap */ |
4ddc07ca PB |
1289 | bs_dest->dirty_count = bs_src->dirty_count; |
1290 | bs_dest->dirty_bitmap = bs_src->dirty_bitmap; | |
a9fc4408 PB |
1291 | |
1292 | /* job */ | |
4ddc07ca PB |
1293 | bs_dest->in_use = bs_src->in_use; |
1294 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1295 | |
8802d1fd | 1296 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1297 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1298 | bs_src->device_name); | |
1299 | bs_dest->list = bs_src->list; | |
1300 | } | |
8802d1fd | 1301 | |
4ddc07ca PB |
1302 | /* |
1303 | * Swap bs contents for two image chains while they are live, | |
1304 | * while keeping required fields on the BlockDriverState that is | |
1305 | * actually attached to a device. | |
1306 | * | |
1307 | * This will modify the BlockDriverState fields, and swap contents | |
1308 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1309 | * | |
1310 | * bs_new is required to be anonymous. | |
1311 | * | |
1312 | * This function does not create any image files. | |
1313 | */ | |
1314 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1315 | { | |
1316 | BlockDriverState tmp; | |
f6801b83 | 1317 | |
4ddc07ca PB |
1318 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1319 | assert(bs_new->device_name[0] == '\0'); | |
1320 | assert(bs_new->dirty_bitmap == NULL); | |
1321 | assert(bs_new->job == NULL); | |
1322 | assert(bs_new->dev == NULL); | |
1323 | assert(bs_new->in_use == 0); | |
1324 | assert(bs_new->io_limits_enabled == false); | |
1325 | assert(bs_new->block_timer == NULL); | |
8802d1fd | 1326 | |
4ddc07ca PB |
1327 | tmp = *bs_new; |
1328 | *bs_new = *bs_old; | |
1329 | *bs_old = tmp; | |
a9fc4408 | 1330 | |
4ddc07ca PB |
1331 | /* there are some fields that should not be swapped, move them back */ |
1332 | bdrv_move_feature_fields(&tmp, bs_old); | |
1333 | bdrv_move_feature_fields(bs_old, bs_new); | |
1334 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1335 | |
4ddc07ca PB |
1336 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1337 | assert(bs_new->device_name[0] == '\0'); | |
1338 | ||
1339 | /* Check a few fields that should remain attached to the device */ | |
1340 | assert(bs_new->dev == NULL); | |
1341 | assert(bs_new->job == NULL); | |
1342 | assert(bs_new->in_use == 0); | |
1343 | assert(bs_new->io_limits_enabled == false); | |
1344 | assert(bs_new->block_timer == NULL); | |
e023b2e2 PB |
1345 | |
1346 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1347 | bdrv_rebind(bs_old); |
1348 | } | |
1349 | ||
1350 | /* | |
1351 | * Add new bs contents at the top of an image chain while the chain is | |
1352 | * live, while keeping required fields on the top layer. | |
1353 | * | |
1354 | * This will modify the BlockDriverState fields, and swap contents | |
1355 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1356 | * | |
1357 | * bs_new is required to be anonymous. | |
1358 | * | |
1359 | * This function does not create any image files. | |
1360 | */ | |
1361 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1362 | { | |
1363 | bdrv_swap(bs_new, bs_top); | |
1364 | ||
1365 | /* The contents of 'tmp' will become bs_top, as we are | |
1366 | * swapping bs_new and bs_top contents. */ | |
1367 | bs_top->backing_hd = bs_new; | |
1368 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1369 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1370 | bs_new->filename); | |
1371 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1372 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1373 | } |
1374 | ||
b338082b FB |
1375 | void bdrv_delete(BlockDriverState *bs) |
1376 | { | |
fa879d62 | 1377 | assert(!bs->dev); |
3e914655 PB |
1378 | assert(!bs->job); |
1379 | assert(!bs->in_use); | |
18846dee | 1380 | |
1b7bdbc1 | 1381 | /* remove from list, if necessary */ |
d22b2f41 | 1382 | bdrv_make_anon(bs); |
34c6f050 | 1383 | |
b338082b | 1384 | bdrv_close(bs); |
66f82cee | 1385 | |
f9092b10 | 1386 | assert(bs != bs_snapshots); |
7267c094 | 1387 | g_free(bs); |
fc01f7e7 FB |
1388 | } |
1389 | ||
fa879d62 MA |
1390 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1391 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1392 | { |
fa879d62 | 1393 | if (bs->dev) { |
18846dee MA |
1394 | return -EBUSY; |
1395 | } | |
fa879d62 | 1396 | bs->dev = dev; |
28a7282a | 1397 | bdrv_iostatus_reset(bs); |
18846dee MA |
1398 | return 0; |
1399 | } | |
1400 | ||
fa879d62 MA |
1401 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1402 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1403 | { |
fa879d62 MA |
1404 | if (bdrv_attach_dev(bs, dev) < 0) { |
1405 | abort(); | |
1406 | } | |
1407 | } | |
1408 | ||
1409 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1410 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1411 | { | |
1412 | assert(bs->dev == dev); | |
1413 | bs->dev = NULL; | |
0e49de52 MA |
1414 | bs->dev_ops = NULL; |
1415 | bs->dev_opaque = NULL; | |
29e05f20 | 1416 | bs->buffer_alignment = 512; |
18846dee MA |
1417 | } |
1418 | ||
fa879d62 MA |
1419 | /* TODO change to return DeviceState * when all users are qdevified */ |
1420 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1421 | { |
fa879d62 | 1422 | return bs->dev; |
18846dee MA |
1423 | } |
1424 | ||
0e49de52 MA |
1425 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1426 | void *opaque) | |
1427 | { | |
1428 | bs->dev_ops = ops; | |
1429 | bs->dev_opaque = opaque; | |
2c6942fa MA |
1430 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
1431 | bs_snapshots = NULL; | |
1432 | } | |
0e49de52 MA |
1433 | } |
1434 | ||
32c81a4a PB |
1435 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1436 | enum MonitorEvent ev, | |
1437 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
1438 | { |
1439 | QObject *data; | |
1440 | const char *action_str; | |
1441 | ||
1442 | switch (action) { | |
1443 | case BDRV_ACTION_REPORT: | |
1444 | action_str = "report"; | |
1445 | break; | |
1446 | case BDRV_ACTION_IGNORE: | |
1447 | action_str = "ignore"; | |
1448 | break; | |
1449 | case BDRV_ACTION_STOP: | |
1450 | action_str = "stop"; | |
1451 | break; | |
1452 | default: | |
1453 | abort(); | |
1454 | } | |
1455 | ||
1456 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1457 | bdrv->device_name, | |
1458 | action_str, | |
1459 | is_read ? "read" : "write"); | |
32c81a4a | 1460 | monitor_protocol_event(ev, data); |
329c0a48 LC |
1461 | |
1462 | qobject_decref(data); | |
1463 | } | |
1464 | ||
6f382ed2 LC |
1465 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1466 | { | |
1467 | QObject *data; | |
1468 | ||
1469 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1470 | bdrv_get_device_name(bs), ejected); | |
1471 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1472 | ||
1473 | qobject_decref(data); | |
1474 | } | |
1475 | ||
7d4b4ba5 | 1476 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1477 | { |
145feb17 | 1478 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1479 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1480 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1481 | if (tray_was_closed) { |
1482 | /* tray open */ | |
1483 | bdrv_emit_qmp_eject_event(bs, true); | |
1484 | } | |
1485 | if (load) { | |
1486 | /* tray close */ | |
1487 | bdrv_emit_qmp_eject_event(bs, false); | |
1488 | } | |
145feb17 MA |
1489 | } |
1490 | } | |
1491 | ||
2c6942fa MA |
1492 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1493 | { | |
1494 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1495 | } | |
1496 | ||
025ccaa7 PB |
1497 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1498 | { | |
1499 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1500 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1501 | } | |
1502 | } | |
1503 | ||
e4def80b MA |
1504 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1505 | { | |
1506 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1507 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1508 | } | |
1509 | return false; | |
1510 | } | |
1511 | ||
145feb17 MA |
1512 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1513 | { | |
1514 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1515 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1516 | } |
1517 | } | |
1518 | ||
f107639a MA |
1519 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1520 | { | |
1521 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1522 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1523 | } | |
1524 | return false; | |
1525 | } | |
1526 | ||
e97fc193 AL |
1527 | /* |
1528 | * Run consistency checks on an image | |
1529 | * | |
e076f338 | 1530 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1531 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1532 | * check are stored in res. |
e97fc193 | 1533 | */ |
4534ff54 | 1534 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1535 | { |
1536 | if (bs->drv->bdrv_check == NULL) { | |
1537 | return -ENOTSUP; | |
1538 | } | |
1539 | ||
e076f338 | 1540 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1541 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1542 | } |
1543 | ||
8a426614 KW |
1544 | #define COMMIT_BUF_SECTORS 2048 |
1545 | ||
33e3963e FB |
1546 | /* commit COW file into the raw image */ |
1547 | int bdrv_commit(BlockDriverState *bs) | |
1548 | { | |
19cb3738 | 1549 | BlockDriver *drv = bs->drv; |
8a426614 KW |
1550 | int64_t sector, total_sectors; |
1551 | int n, ro, open_flags; | |
0bce597d | 1552 | int ret = 0; |
8a426614 | 1553 | uint8_t *buf; |
c2cba3d9 | 1554 | char filename[PATH_MAX]; |
33e3963e | 1555 | |
19cb3738 FB |
1556 | if (!drv) |
1557 | return -ENOMEDIUM; | |
4dca4b63 NS |
1558 | |
1559 | if (!bs->backing_hd) { | |
1560 | return -ENOTSUP; | |
33e3963e FB |
1561 | } |
1562 | ||
2d3735d3 SH |
1563 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1564 | return -EBUSY; | |
1565 | } | |
1566 | ||
4dca4b63 | 1567 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
1568 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
1569 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
1570 | open_flags = bs->backing_hd->open_flags; |
1571 | ||
1572 | if (ro) { | |
0bce597d JC |
1573 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
1574 | return -EACCES; | |
4dca4b63 | 1575 | } |
ea2384d3 | 1576 | } |
33e3963e | 1577 | |
6ea44308 | 1578 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1579 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1580 | |
1581 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1582 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1583 | |
1584 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1585 | ret = -EIO; | |
1586 | goto ro_cleanup; | |
1587 | } | |
1588 | ||
1589 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1590 | ret = -EIO; | |
1591 | goto ro_cleanup; | |
1592 | } | |
ea2384d3 | 1593 | } |
33e3963e | 1594 | } |
95389c86 | 1595 | |
1d44952f CH |
1596 | if (drv->bdrv_make_empty) { |
1597 | ret = drv->bdrv_make_empty(bs); | |
1598 | bdrv_flush(bs); | |
1599 | } | |
95389c86 | 1600 | |
3f5075ae CH |
1601 | /* |
1602 | * Make sure all data we wrote to the backing device is actually | |
1603 | * stable on disk. | |
1604 | */ | |
1605 | if (bs->backing_hd) | |
1606 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1607 | |
1608 | ro_cleanup: | |
7267c094 | 1609 | g_free(buf); |
4dca4b63 NS |
1610 | |
1611 | if (ro) { | |
0bce597d JC |
1612 | /* ignoring error return here */ |
1613 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
1614 | } |
1615 | ||
1d44952f | 1616 | return ret; |
33e3963e FB |
1617 | } |
1618 | ||
e8877497 | 1619 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1620 | { |
1621 | BlockDriverState *bs; | |
1622 | ||
1623 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
e8877497 SH |
1624 | int ret = bdrv_commit(bs); |
1625 | if (ret < 0) { | |
1626 | return ret; | |
1627 | } | |
6ab4b5ab | 1628 | } |
e8877497 | 1629 | return 0; |
6ab4b5ab MA |
1630 | } |
1631 | ||
dbffbdcf SH |
1632 | struct BdrvTrackedRequest { |
1633 | BlockDriverState *bs; | |
1634 | int64_t sector_num; | |
1635 | int nb_sectors; | |
1636 | bool is_write; | |
1637 | QLIST_ENTRY(BdrvTrackedRequest) list; | |
5f8b6491 | 1638 | Coroutine *co; /* owner, used for deadlock detection */ |
f4658285 | 1639 | CoQueue wait_queue; /* coroutines blocked on this request */ |
dbffbdcf SH |
1640 | }; |
1641 | ||
1642 | /** | |
1643 | * Remove an active request from the tracked requests list | |
1644 | * | |
1645 | * This function should be called when a tracked request is completing. | |
1646 | */ | |
1647 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1648 | { | |
1649 | QLIST_REMOVE(req, list); | |
f4658285 | 1650 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1651 | } |
1652 | ||
1653 | /** | |
1654 | * Add an active request to the tracked requests list | |
1655 | */ | |
1656 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1657 | BlockDriverState *bs, | |
1658 | int64_t sector_num, | |
1659 | int nb_sectors, bool is_write) | |
1660 | { | |
1661 | *req = (BdrvTrackedRequest){ | |
1662 | .bs = bs, | |
1663 | .sector_num = sector_num, | |
1664 | .nb_sectors = nb_sectors, | |
1665 | .is_write = is_write, | |
5f8b6491 | 1666 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1667 | }; |
1668 | ||
f4658285 SH |
1669 | qemu_co_queue_init(&req->wait_queue); |
1670 | ||
dbffbdcf SH |
1671 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1672 | } | |
1673 | ||
d83947ac SH |
1674 | /** |
1675 | * Round a region to cluster boundaries | |
1676 | */ | |
1677 | static void round_to_clusters(BlockDriverState *bs, | |
1678 | int64_t sector_num, int nb_sectors, | |
1679 | int64_t *cluster_sector_num, | |
1680 | int *cluster_nb_sectors) | |
1681 | { | |
1682 | BlockDriverInfo bdi; | |
1683 | ||
1684 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1685 | *cluster_sector_num = sector_num; | |
1686 | *cluster_nb_sectors = nb_sectors; | |
1687 | } else { | |
1688 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1689 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1690 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1691 | nb_sectors, c); | |
1692 | } | |
1693 | } | |
1694 | ||
f4658285 SH |
1695 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1696 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1697 | /* aaaa bbbb */ |
1698 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1699 | return false; | |
1700 | } | |
1701 | /* bbbb aaaa */ | |
1702 | if (req->sector_num >= sector_num + nb_sectors) { | |
1703 | return false; | |
1704 | } | |
1705 | return true; | |
f4658285 SH |
1706 | } |
1707 | ||
1708 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1709 | int64_t sector_num, int nb_sectors) | |
1710 | { | |
1711 | BdrvTrackedRequest *req; | |
d83947ac SH |
1712 | int64_t cluster_sector_num; |
1713 | int cluster_nb_sectors; | |
f4658285 SH |
1714 | bool retry; |
1715 | ||
d83947ac SH |
1716 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1717 | * that allocating writes will be serialized and not race with each other | |
1718 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1719 | * CoR read and write operations are atomic and guest writes cannot | |
1720 | * interleave between them. | |
1721 | */ | |
1722 | round_to_clusters(bs, sector_num, nb_sectors, | |
1723 | &cluster_sector_num, &cluster_nb_sectors); | |
1724 | ||
f4658285 SH |
1725 | do { |
1726 | retry = false; | |
1727 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1728 | if (tracked_request_overlaps(req, cluster_sector_num, |
1729 | cluster_nb_sectors)) { | |
5f8b6491 SH |
1730 | /* Hitting this means there was a reentrant request, for |
1731 | * example, a block driver issuing nested requests. This must | |
1732 | * never happen since it means deadlock. | |
1733 | */ | |
1734 | assert(qemu_coroutine_self() != req->co); | |
1735 | ||
f4658285 SH |
1736 | qemu_co_queue_wait(&req->wait_queue); |
1737 | retry = true; | |
1738 | break; | |
1739 | } | |
1740 | } | |
1741 | } while (retry); | |
1742 | } | |
1743 | ||
756e6736 KW |
1744 | /* |
1745 | * Return values: | |
1746 | * 0 - success | |
1747 | * -EINVAL - backing format specified, but no file | |
1748 | * -ENOSPC - can't update the backing file because no space is left in the | |
1749 | * image file header | |
1750 | * -ENOTSUP - format driver doesn't support changing the backing file | |
1751 | */ | |
1752 | int bdrv_change_backing_file(BlockDriverState *bs, | |
1753 | const char *backing_file, const char *backing_fmt) | |
1754 | { | |
1755 | BlockDriver *drv = bs->drv; | |
469ef350 | 1756 | int ret; |
756e6736 | 1757 | |
5f377794 PB |
1758 | /* Backing file format doesn't make sense without a backing file */ |
1759 | if (backing_fmt && !backing_file) { | |
1760 | return -EINVAL; | |
1761 | } | |
1762 | ||
756e6736 | 1763 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 1764 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 1765 | } else { |
469ef350 | 1766 | ret = -ENOTSUP; |
756e6736 | 1767 | } |
469ef350 PB |
1768 | |
1769 | if (ret == 0) { | |
1770 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
1771 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1772 | } | |
1773 | return ret; | |
756e6736 KW |
1774 | } |
1775 | ||
6ebdcee2 JC |
1776 | /* |
1777 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
1778 | * | |
1779 | * active is the current topmost image. | |
1780 | * | |
1781 | * Returns NULL if bs is not found in active's image chain, | |
1782 | * or if active == bs. | |
1783 | */ | |
1784 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
1785 | BlockDriverState *bs) | |
1786 | { | |
1787 | BlockDriverState *overlay = NULL; | |
1788 | BlockDriverState *intermediate; | |
1789 | ||
1790 | assert(active != NULL); | |
1791 | assert(bs != NULL); | |
1792 | ||
1793 | /* if bs is the same as active, then by definition it has no overlay | |
1794 | */ | |
1795 | if (active == bs) { | |
1796 | return NULL; | |
1797 | } | |
1798 | ||
1799 | intermediate = active; | |
1800 | while (intermediate->backing_hd) { | |
1801 | if (intermediate->backing_hd == bs) { | |
1802 | overlay = intermediate; | |
1803 | break; | |
1804 | } | |
1805 | intermediate = intermediate->backing_hd; | |
1806 | } | |
1807 | ||
1808 | return overlay; | |
1809 | } | |
1810 | ||
1811 | typedef struct BlkIntermediateStates { | |
1812 | BlockDriverState *bs; | |
1813 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
1814 | } BlkIntermediateStates; | |
1815 | ||
1816 | ||
1817 | /* | |
1818 | * Drops images above 'base' up to and including 'top', and sets the image | |
1819 | * above 'top' to have base as its backing file. | |
1820 | * | |
1821 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
1822 | * information in 'bs' can be properly updated. | |
1823 | * | |
1824 | * E.g., this will convert the following chain: | |
1825 | * bottom <- base <- intermediate <- top <- active | |
1826 | * | |
1827 | * to | |
1828 | * | |
1829 | * bottom <- base <- active | |
1830 | * | |
1831 | * It is allowed for bottom==base, in which case it converts: | |
1832 | * | |
1833 | * base <- intermediate <- top <- active | |
1834 | * | |
1835 | * to | |
1836 | * | |
1837 | * base <- active | |
1838 | * | |
1839 | * Error conditions: | |
1840 | * if active == top, that is considered an error | |
1841 | * | |
1842 | */ | |
1843 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
1844 | BlockDriverState *base) | |
1845 | { | |
1846 | BlockDriverState *intermediate; | |
1847 | BlockDriverState *base_bs = NULL; | |
1848 | BlockDriverState *new_top_bs = NULL; | |
1849 | BlkIntermediateStates *intermediate_state, *next; | |
1850 | int ret = -EIO; | |
1851 | ||
1852 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
1853 | QSIMPLEQ_INIT(&states_to_delete); | |
1854 | ||
1855 | if (!top->drv || !base->drv) { | |
1856 | goto exit; | |
1857 | } | |
1858 | ||
1859 | new_top_bs = bdrv_find_overlay(active, top); | |
1860 | ||
1861 | if (new_top_bs == NULL) { | |
1862 | /* we could not find the image above 'top', this is an error */ | |
1863 | goto exit; | |
1864 | } | |
1865 | ||
1866 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
1867 | * to do, no intermediate images */ | |
1868 | if (new_top_bs->backing_hd == base) { | |
1869 | ret = 0; | |
1870 | goto exit; | |
1871 | } | |
1872 | ||
1873 | intermediate = top; | |
1874 | ||
1875 | /* now we will go down through the list, and add each BDS we find | |
1876 | * into our deletion queue, until we hit the 'base' | |
1877 | */ | |
1878 | while (intermediate) { | |
1879 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
1880 | intermediate_state->bs = intermediate; | |
1881 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
1882 | ||
1883 | if (intermediate->backing_hd == base) { | |
1884 | base_bs = intermediate->backing_hd; | |
1885 | break; | |
1886 | } | |
1887 | intermediate = intermediate->backing_hd; | |
1888 | } | |
1889 | if (base_bs == NULL) { | |
1890 | /* something went wrong, we did not end at the base. safely | |
1891 | * unravel everything, and exit with error */ | |
1892 | goto exit; | |
1893 | } | |
1894 | ||
1895 | /* success - we can delete the intermediate states, and link top->base */ | |
1896 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
1897 | base_bs->drv ? base_bs->drv->format_name : ""); | |
1898 | if (ret) { | |
1899 | goto exit; | |
1900 | } | |
1901 | new_top_bs->backing_hd = base_bs; | |
1902 | ||
1903 | ||
1904 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
1905 | /* so that bdrv_close() does not recursively close the chain */ | |
1906 | intermediate_state->bs->backing_hd = NULL; | |
1907 | bdrv_delete(intermediate_state->bs); | |
1908 | } | |
1909 | ret = 0; | |
1910 | ||
1911 | exit: | |
1912 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
1913 | g_free(intermediate_state); | |
1914 | } | |
1915 | return ret; | |
1916 | } | |
1917 | ||
1918 | ||
71d0770c AL |
1919 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1920 | size_t size) | |
1921 | { | |
1922 | int64_t len; | |
1923 | ||
1924 | if (!bdrv_is_inserted(bs)) | |
1925 | return -ENOMEDIUM; | |
1926 | ||
1927 | if (bs->growable) | |
1928 | return 0; | |
1929 | ||
1930 | len = bdrv_getlength(bs); | |
1931 | ||
fbb7b4e0 KW |
1932 | if (offset < 0) |
1933 | return -EIO; | |
1934 | ||
1935 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
1936 | return -EIO; |
1937 | ||
1938 | return 0; | |
1939 | } | |
1940 | ||
1941 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
1942 | int nb_sectors) | |
1943 | { | |
eb5a3165 JS |
1944 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
1945 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
1946 | } |
1947 | ||
1c9805a3 SH |
1948 | typedef struct RwCo { |
1949 | BlockDriverState *bs; | |
1950 | int64_t sector_num; | |
1951 | int nb_sectors; | |
1952 | QEMUIOVector *qiov; | |
1953 | bool is_write; | |
1954 | int ret; | |
1955 | } RwCo; | |
1956 | ||
1957 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 1958 | { |
1c9805a3 | 1959 | RwCo *rwco = opaque; |
ea2384d3 | 1960 | |
1c9805a3 SH |
1961 | if (!rwco->is_write) { |
1962 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
470c0504 | 1963 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1964 | } else { |
1965 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
f08f2dda | 1966 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1967 | } |
1968 | } | |
e7a8a783 | 1969 | |
1c9805a3 SH |
1970 | /* |
1971 | * Process a synchronous request using coroutines | |
1972 | */ | |
1973 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
1974 | int nb_sectors, bool is_write) | |
1975 | { | |
1976 | QEMUIOVector qiov; | |
1977 | struct iovec iov = { | |
1978 | .iov_base = (void *)buf, | |
1979 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1980 | }; | |
1981 | Coroutine *co; | |
1982 | RwCo rwco = { | |
1983 | .bs = bs, | |
1984 | .sector_num = sector_num, | |
1985 | .nb_sectors = nb_sectors, | |
1986 | .qiov = &qiov, | |
1987 | .is_write = is_write, | |
1988 | .ret = NOT_DONE, | |
1989 | }; | |
e7a8a783 | 1990 | |
1c9805a3 | 1991 | qemu_iovec_init_external(&qiov, &iov, 1); |
e7a8a783 | 1992 | |
498e386c ZYW |
1993 | /** |
1994 | * In sync call context, when the vcpu is blocked, this throttling timer | |
1995 | * will not fire; so the I/O throttling function has to be disabled here | |
1996 | * if it has been enabled. | |
1997 | */ | |
1998 | if (bs->io_limits_enabled) { | |
1999 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2000 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2001 | bdrv_io_limits_disable(bs); | |
2002 | } | |
2003 | ||
1c9805a3 SH |
2004 | if (qemu_in_coroutine()) { |
2005 | /* Fast-path if already in coroutine context */ | |
2006 | bdrv_rw_co_entry(&rwco); | |
2007 | } else { | |
2008 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2009 | qemu_coroutine_enter(co, &rwco); | |
2010 | while (rwco.ret == NOT_DONE) { | |
2011 | qemu_aio_wait(); | |
2012 | } | |
2013 | } | |
2014 | return rwco.ret; | |
2015 | } | |
b338082b | 2016 | |
1c9805a3 SH |
2017 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2018 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2019 | uint8_t *buf, int nb_sectors) | |
2020 | { | |
2021 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
fc01f7e7 FB |
2022 | } |
2023 | ||
07d27a44 MA |
2024 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2025 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2026 | uint8_t *buf, int nb_sectors) | |
2027 | { | |
2028 | bool enabled; | |
2029 | int ret; | |
2030 | ||
2031 | enabled = bs->io_limits_enabled; | |
2032 | bs->io_limits_enabled = false; | |
2033 | ret = bdrv_read(bs, 0, buf, 1); | |
2034 | bs->io_limits_enabled = enabled; | |
2035 | return ret; | |
2036 | } | |
2037 | ||
71df14fc PB |
2038 | #define BITS_PER_LONG (sizeof(unsigned long) * 8) |
2039 | ||
7cd1e32a | 2040 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 2041 | int nb_sectors, int dirty) |
7cd1e32a | 2042 | { |
2043 | int64_t start, end; | |
c6d22830 | 2044 | unsigned long val, idx, bit; |
a55eb92c | 2045 | |
6ea44308 | 2046 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 2047 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
2048 | |
2049 | for (; start <= end; start++) { | |
71df14fc PB |
2050 | idx = start / BITS_PER_LONG; |
2051 | bit = start % BITS_PER_LONG; | |
c6d22830 JK |
2052 | val = bs->dirty_bitmap[idx]; |
2053 | if (dirty) { | |
6d59fec1 | 2054 | if (!(val & (1UL << bit))) { |
aaa0eb75 | 2055 | bs->dirty_count++; |
6d59fec1 | 2056 | val |= 1UL << bit; |
aaa0eb75 | 2057 | } |
c6d22830 | 2058 | } else { |
6d59fec1 | 2059 | if (val & (1UL << bit)) { |
aaa0eb75 | 2060 | bs->dirty_count--; |
6d59fec1 | 2061 | val &= ~(1UL << bit); |
aaa0eb75 | 2062 | } |
c6d22830 JK |
2063 | } |
2064 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 2065 | } |
2066 | } | |
2067 | ||
5fafdf24 | 2068 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2069 | -EIO generic I/O error (may happen for all errors) |
2070 | -ENOMEDIUM No media inserted. | |
2071 | -EINVAL Invalid sector number or nb_sectors | |
2072 | -EACCES Trying to write a read-only device | |
2073 | */ | |
5fafdf24 | 2074 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2075 | const uint8_t *buf, int nb_sectors) |
2076 | { | |
1c9805a3 | 2077 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
83f64091 FB |
2078 | } |
2079 | ||
eda578e5 AL |
2080 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
2081 | void *buf, int count1) | |
83f64091 | 2082 | { |
6ea44308 | 2083 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2084 | int len, nb_sectors, count; |
2085 | int64_t sector_num; | |
9a8c4cce | 2086 | int ret; |
83f64091 FB |
2087 | |
2088 | count = count1; | |
2089 | /* first read to align to sector start */ | |
6ea44308 | 2090 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2091 | if (len > count) |
2092 | len = count; | |
6ea44308 | 2093 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2094 | if (len > 0) { |
9a8c4cce KW |
2095 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2096 | return ret; | |
6ea44308 | 2097 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
2098 | count -= len; |
2099 | if (count == 0) | |
2100 | return count1; | |
2101 | sector_num++; | |
2102 | buf += len; | |
2103 | } | |
2104 | ||
2105 | /* read the sectors "in place" */ | |
6ea44308 | 2106 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2107 | if (nb_sectors > 0) { |
9a8c4cce KW |
2108 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
2109 | return ret; | |
83f64091 | 2110 | sector_num += nb_sectors; |
6ea44308 | 2111 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2112 | buf += len; |
2113 | count -= len; | |
2114 | } | |
2115 | ||
2116 | /* add data from the last sector */ | |
2117 | if (count > 0) { | |
9a8c4cce KW |
2118 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2119 | return ret; | |
83f64091 FB |
2120 | memcpy(buf, tmp_buf, count); |
2121 | } | |
2122 | return count1; | |
2123 | } | |
2124 | ||
eda578e5 AL |
2125 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
2126 | const void *buf, int count1) | |
83f64091 | 2127 | { |
6ea44308 | 2128 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2129 | int len, nb_sectors, count; |
2130 | int64_t sector_num; | |
9a8c4cce | 2131 | int ret; |
83f64091 FB |
2132 | |
2133 | count = count1; | |
2134 | /* first write to align to sector start */ | |
6ea44308 | 2135 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2136 | if (len > count) |
2137 | len = count; | |
6ea44308 | 2138 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2139 | if (len > 0) { |
9a8c4cce KW |
2140 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2141 | return ret; | |
6ea44308 | 2142 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
2143 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2144 | return ret; | |
83f64091 FB |
2145 | count -= len; |
2146 | if (count == 0) | |
2147 | return count1; | |
2148 | sector_num++; | |
2149 | buf += len; | |
2150 | } | |
2151 | ||
2152 | /* write the sectors "in place" */ | |
6ea44308 | 2153 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2154 | if (nb_sectors > 0) { |
9a8c4cce KW |
2155 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
2156 | return ret; | |
83f64091 | 2157 | sector_num += nb_sectors; |
6ea44308 | 2158 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2159 | buf += len; |
2160 | count -= len; | |
2161 | } | |
2162 | ||
2163 | /* add data from the last sector */ | |
2164 | if (count > 0) { | |
9a8c4cce KW |
2165 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2166 | return ret; | |
83f64091 | 2167 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
2168 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2169 | return ret; | |
83f64091 FB |
2170 | } |
2171 | return count1; | |
2172 | } | |
83f64091 | 2173 | |
f08145fe KW |
2174 | /* |
2175 | * Writes to the file and ensures that no writes are reordered across this | |
2176 | * request (acts as a barrier) | |
2177 | * | |
2178 | * Returns 0 on success, -errno in error cases. | |
2179 | */ | |
2180 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2181 | const void *buf, int count) | |
2182 | { | |
2183 | int ret; | |
2184 | ||
2185 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2186 | if (ret < 0) { | |
2187 | return ret; | |
2188 | } | |
2189 | ||
f05fa4ad PB |
2190 | /* No flush needed for cache modes that already do it */ |
2191 | if (bs->enable_write_cache) { | |
f08145fe KW |
2192 | bdrv_flush(bs); |
2193 | } | |
2194 | ||
2195 | return 0; | |
2196 | } | |
2197 | ||
470c0504 | 2198 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2199 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2200 | { | |
2201 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2202 | * their read buffer while the operation is in progress do not end up | |
2203 | * modifying the image file. This is critical for zero-copy guest I/O | |
2204 | * where anything might happen inside guest memory. | |
2205 | */ | |
2206 | void *bounce_buffer; | |
2207 | ||
79c053bd | 2208 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2209 | struct iovec iov; |
2210 | QEMUIOVector bounce_qiov; | |
2211 | int64_t cluster_sector_num; | |
2212 | int cluster_nb_sectors; | |
2213 | size_t skip_bytes; | |
2214 | int ret; | |
2215 | ||
2216 | /* Cover entire cluster so no additional backing file I/O is required when | |
2217 | * allocating cluster in the image file. | |
2218 | */ | |
2219 | round_to_clusters(bs, sector_num, nb_sectors, | |
2220 | &cluster_sector_num, &cluster_nb_sectors); | |
2221 | ||
470c0504 SH |
2222 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2223 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2224 | |
2225 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2226 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2227 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2228 | ||
79c053bd SH |
2229 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2230 | &bounce_qiov); | |
ab185921 SH |
2231 | if (ret < 0) { |
2232 | goto err; | |
2233 | } | |
2234 | ||
79c053bd SH |
2235 | if (drv->bdrv_co_write_zeroes && |
2236 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
2237 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
2238 | cluster_nb_sectors); | |
79c053bd | 2239 | } else { |
f05fa4ad PB |
2240 | /* This does not change the data on the disk, it is not necessary |
2241 | * to flush even in cache=writethrough mode. | |
2242 | */ | |
79c053bd | 2243 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2244 | &bounce_qiov); |
79c053bd SH |
2245 | } |
2246 | ||
ab185921 SH |
2247 | if (ret < 0) { |
2248 | /* It might be okay to ignore write errors for guest requests. If this | |
2249 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2250 | * Simply report it in all cases. | |
2251 | */ | |
2252 | goto err; | |
2253 | } | |
2254 | ||
2255 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2256 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2257 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2258 | |
2259 | err: | |
2260 | qemu_vfree(bounce_buffer); | |
2261 | return ret; | |
2262 | } | |
2263 | ||
c5fbe571 SH |
2264 | /* |
2265 | * Handle a read request in coroutine context | |
2266 | */ | |
2267 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
2268 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2269 | BdrvRequestFlags flags) | |
da1fa91d KW |
2270 | { |
2271 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
2272 | BdrvTrackedRequest req; |
2273 | int ret; | |
da1fa91d | 2274 | |
da1fa91d KW |
2275 | if (!drv) { |
2276 | return -ENOMEDIUM; | |
2277 | } | |
2278 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2279 | return -EIO; | |
2280 | } | |
2281 | ||
98f90dba ZYW |
2282 | /* throttling disk read I/O */ |
2283 | if (bs->io_limits_enabled) { | |
2284 | bdrv_io_limits_intercept(bs, false, nb_sectors); | |
2285 | } | |
2286 | ||
f4658285 | 2287 | if (bs->copy_on_read) { |
470c0504 SH |
2288 | flags |= BDRV_REQ_COPY_ON_READ; |
2289 | } | |
2290 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2291 | bs->copy_on_read_in_flight++; | |
2292 | } | |
2293 | ||
2294 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
2295 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2296 | } | |
2297 | ||
dbffbdcf | 2298 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 2299 | |
470c0504 | 2300 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2301 | int pnum; |
2302 | ||
2303 | ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); | |
2304 | if (ret < 0) { | |
2305 | goto out; | |
2306 | } | |
2307 | ||
2308 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2309 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2310 | goto out; |
2311 | } | |
2312 | } | |
2313 | ||
dbffbdcf | 2314 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2315 | |
2316 | out: | |
dbffbdcf | 2317 | tracked_request_end(&req); |
470c0504 SH |
2318 | |
2319 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2320 | bs->copy_on_read_in_flight--; | |
2321 | } | |
2322 | ||
dbffbdcf | 2323 | return ret; |
da1fa91d KW |
2324 | } |
2325 | ||
c5fbe571 | 2326 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
2327 | int nb_sectors, QEMUIOVector *qiov) |
2328 | { | |
c5fbe571 | 2329 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 2330 | |
470c0504 SH |
2331 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
2332 | } | |
2333 | ||
2334 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
2335 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
2336 | { | |
2337 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
2338 | ||
2339 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
2340 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
2341 | } |
2342 | ||
f08f2dda SH |
2343 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
2344 | int64_t sector_num, int nb_sectors) | |
2345 | { | |
2346 | BlockDriver *drv = bs->drv; | |
2347 | QEMUIOVector qiov; | |
2348 | struct iovec iov; | |
2349 | int ret; | |
2350 | ||
621f0589 KW |
2351 | /* TODO Emulate only part of misaligned requests instead of letting block |
2352 | * drivers return -ENOTSUP and emulate everything */ | |
2353 | ||
f08f2dda SH |
2354 | /* First try the efficient write zeroes operation */ |
2355 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
2356 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
2357 | if (ret != -ENOTSUP) { | |
2358 | return ret; | |
2359 | } | |
f08f2dda SH |
2360 | } |
2361 | ||
2362 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
2363 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2364 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
2365 | memset(iov.iov_base, 0, iov.iov_len); | |
2366 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2367 | ||
2368 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
2369 | ||
2370 | qemu_vfree(iov.iov_base); | |
2371 | return ret; | |
2372 | } | |
2373 | ||
c5fbe571 SH |
2374 | /* |
2375 | * Handle a write request in coroutine context | |
2376 | */ | |
2377 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
2378 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2379 | BdrvRequestFlags flags) | |
c5fbe571 SH |
2380 | { |
2381 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 2382 | BdrvTrackedRequest req; |
6b7cb247 | 2383 | int ret; |
da1fa91d KW |
2384 | |
2385 | if (!bs->drv) { | |
2386 | return -ENOMEDIUM; | |
2387 | } | |
2388 | if (bs->read_only) { | |
2389 | return -EACCES; | |
2390 | } | |
2391 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2392 | return -EIO; | |
2393 | } | |
2394 | ||
98f90dba ZYW |
2395 | /* throttling disk write I/O */ |
2396 | if (bs->io_limits_enabled) { | |
2397 | bdrv_io_limits_intercept(bs, true, nb_sectors); | |
2398 | } | |
2399 | ||
470c0504 | 2400 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
2401 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2402 | } | |
2403 | ||
dbffbdcf SH |
2404 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
2405 | ||
f08f2dda SH |
2406 | if (flags & BDRV_REQ_ZERO_WRITE) { |
2407 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); | |
2408 | } else { | |
2409 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
2410 | } | |
6b7cb247 | 2411 | |
f05fa4ad PB |
2412 | if (ret == 0 && !bs->enable_write_cache) { |
2413 | ret = bdrv_co_flush(bs); | |
2414 | } | |
2415 | ||
da1fa91d | 2416 | if (bs->dirty_bitmap) { |
1755da16 | 2417 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
2418 | } |
2419 | ||
2420 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2421 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2422 | } | |
2423 | ||
dbffbdcf SH |
2424 | tracked_request_end(&req); |
2425 | ||
6b7cb247 | 2426 | return ret; |
da1fa91d KW |
2427 | } |
2428 | ||
c5fbe571 SH |
2429 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2430 | int nb_sectors, QEMUIOVector *qiov) | |
2431 | { | |
2432 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2433 | ||
f08f2dda SH |
2434 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
2435 | } | |
2436 | ||
2437 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
2438 | int64_t sector_num, int nb_sectors) | |
2439 | { | |
2440 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
2441 | ||
2442 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
2443 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
2444 | } |
2445 | ||
83f64091 FB |
2446 | /** |
2447 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2448 | */ | |
2449 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2450 | { | |
2451 | BlockDriver *drv = bs->drv; | |
51762288 | 2452 | int ret; |
83f64091 | 2453 | if (!drv) |
19cb3738 | 2454 | return -ENOMEDIUM; |
83f64091 FB |
2455 | if (!drv->bdrv_truncate) |
2456 | return -ENOTSUP; | |
59f2689d NS |
2457 | if (bs->read_only) |
2458 | return -EACCES; | |
8591675f MT |
2459 | if (bdrv_in_use(bs)) |
2460 | return -EBUSY; | |
51762288 SH |
2461 | ret = drv->bdrv_truncate(bs, offset); |
2462 | if (ret == 0) { | |
2463 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2464 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2465 | } |
2466 | return ret; | |
83f64091 FB |
2467 | } |
2468 | ||
4a1d5e1f FZ |
2469 | /** |
2470 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2471 | * allocated space. Return < 0 if error or unknown. | |
2472 | */ | |
2473 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2474 | { | |
2475 | BlockDriver *drv = bs->drv; | |
2476 | if (!drv) { | |
2477 | return -ENOMEDIUM; | |
2478 | } | |
2479 | if (drv->bdrv_get_allocated_file_size) { | |
2480 | return drv->bdrv_get_allocated_file_size(bs); | |
2481 | } | |
2482 | if (bs->file) { | |
2483 | return bdrv_get_allocated_file_size(bs->file); | |
2484 | } | |
2485 | return -ENOTSUP; | |
2486 | } | |
2487 | ||
83f64091 FB |
2488 | /** |
2489 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2490 | */ | |
2491 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2492 | { | |
2493 | BlockDriver *drv = bs->drv; | |
2494 | if (!drv) | |
19cb3738 | 2495 | return -ENOMEDIUM; |
51762288 | 2496 | |
2c6942fa | 2497 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2498 | if (drv->bdrv_getlength) { |
2499 | return drv->bdrv_getlength(bs); | |
2500 | } | |
83f64091 | 2501 | } |
46a4e4e6 | 2502 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2503 | } |
2504 | ||
19cb3738 | 2505 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2506 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2507 | { |
19cb3738 FB |
2508 | int64_t length; |
2509 | length = bdrv_getlength(bs); | |
2510 | if (length < 0) | |
2511 | length = 0; | |
2512 | else | |
6ea44308 | 2513 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2514 | *nb_sectors_ptr = length; |
fc01f7e7 | 2515 | } |
cf98951b | 2516 | |
0563e191 ZYW |
2517 | /* throttling disk io limits */ |
2518 | void bdrv_set_io_limits(BlockDriverState *bs, | |
2519 | BlockIOLimit *io_limits) | |
2520 | { | |
2521 | bs->io_limits = *io_limits; | |
2522 | bs->io_limits_enabled = bdrv_io_limits_enabled(bs); | |
2523 | } | |
2524 | ||
ff06f5f3 PB |
2525 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
2526 | BlockdevOnError on_write_error) | |
abd7f68d MA |
2527 | { |
2528 | bs->on_read_error = on_read_error; | |
2529 | bs->on_write_error = on_write_error; | |
2530 | } | |
2531 | ||
1ceee0d5 | 2532 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
2533 | { |
2534 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2535 | } | |
2536 | ||
3e1caa5f PB |
2537 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
2538 | { | |
2539 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
2540 | ||
2541 | switch (on_err) { | |
2542 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2543 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
2544 | case BLOCKDEV_ON_ERROR_STOP: | |
2545 | return BDRV_ACTION_STOP; | |
2546 | case BLOCKDEV_ON_ERROR_REPORT: | |
2547 | return BDRV_ACTION_REPORT; | |
2548 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2549 | return BDRV_ACTION_IGNORE; | |
2550 | default: | |
2551 | abort(); | |
2552 | } | |
2553 | } | |
2554 | ||
2555 | /* This is done by device models because, while the block layer knows | |
2556 | * about the error, it does not know whether an operation comes from | |
2557 | * the device or the block layer (from a job, for example). | |
2558 | */ | |
2559 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
2560 | bool is_read, int error) | |
2561 | { | |
2562 | assert(error >= 0); | |
32c81a4a | 2563 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
2564 | if (action == BDRV_ACTION_STOP) { |
2565 | vm_stop(RUN_STATE_IO_ERROR); | |
2566 | bdrv_iostatus_set_err(bs, error); | |
2567 | } | |
2568 | } | |
2569 | ||
b338082b FB |
2570 | int bdrv_is_read_only(BlockDriverState *bs) |
2571 | { | |
2572 | return bs->read_only; | |
2573 | } | |
2574 | ||
985a03b0 TS |
2575 | int bdrv_is_sg(BlockDriverState *bs) |
2576 | { | |
2577 | return bs->sg; | |
2578 | } | |
2579 | ||
e900a7b7 CH |
2580 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2581 | { | |
2582 | return bs->enable_write_cache; | |
2583 | } | |
2584 | ||
425b0148 PB |
2585 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
2586 | { | |
2587 | bs->enable_write_cache = wce; | |
55b110f2 JC |
2588 | |
2589 | /* so a reopen() will preserve wce */ | |
2590 | if (wce) { | |
2591 | bs->open_flags |= BDRV_O_CACHE_WB; | |
2592 | } else { | |
2593 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
2594 | } | |
425b0148 PB |
2595 | } |
2596 | ||
ea2384d3 FB |
2597 | int bdrv_is_encrypted(BlockDriverState *bs) |
2598 | { | |
2599 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2600 | return 1; | |
2601 | return bs->encrypted; | |
2602 | } | |
2603 | ||
c0f4ce77 AL |
2604 | int bdrv_key_required(BlockDriverState *bs) |
2605 | { | |
2606 | BlockDriverState *backing_hd = bs->backing_hd; | |
2607 | ||
2608 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2609 | return 1; | |
2610 | return (bs->encrypted && !bs->valid_key); | |
2611 | } | |
2612 | ||
ea2384d3 FB |
2613 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2614 | { | |
2615 | int ret; | |
2616 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2617 | ret = bdrv_set_key(bs->backing_hd, key); | |
2618 | if (ret < 0) | |
2619 | return ret; | |
2620 | if (!bs->encrypted) | |
2621 | return 0; | |
2622 | } | |
fd04a2ae SH |
2623 | if (!bs->encrypted) { |
2624 | return -EINVAL; | |
2625 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2626 | return -ENOMEDIUM; | |
2627 | } | |
c0f4ce77 | 2628 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2629 | if (ret < 0) { |
2630 | bs->valid_key = 0; | |
2631 | } else if (!bs->valid_key) { | |
2632 | bs->valid_key = 1; | |
2633 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2634 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2635 | } |
c0f4ce77 | 2636 | return ret; |
ea2384d3 FB |
2637 | } |
2638 | ||
f8d6bba1 | 2639 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 2640 | { |
f8d6bba1 | 2641 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
2642 | } |
2643 | ||
5fafdf24 | 2644 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2645 | void *opaque) |
2646 | { | |
2647 | BlockDriver *drv; | |
2648 | ||
8a22f02a | 2649 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2650 | it(opaque, drv->format_name); |
2651 | } | |
2652 | } | |
2653 | ||
b338082b FB |
2654 | BlockDriverState *bdrv_find(const char *name) |
2655 | { | |
2656 | BlockDriverState *bs; | |
2657 | ||
1b7bdbc1 SH |
2658 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2659 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2660 | return bs; |
1b7bdbc1 | 2661 | } |
b338082b FB |
2662 | } |
2663 | return NULL; | |
2664 | } | |
2665 | ||
2f399b0a MA |
2666 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2667 | { | |
2668 | if (!bs) { | |
2669 | return QTAILQ_FIRST(&bdrv_states); | |
2670 | } | |
2671 | return QTAILQ_NEXT(bs, list); | |
2672 | } | |
2673 | ||
51de9760 | 2674 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2675 | { |
2676 | BlockDriverState *bs; | |
2677 | ||
1b7bdbc1 | 2678 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2679 | it(opaque, bs); |
81d0912d FB |
2680 | } |
2681 | } | |
2682 | ||
ea2384d3 FB |
2683 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2684 | { | |
2685 | return bs->device_name; | |
2686 | } | |
2687 | ||
c8433287 MA |
2688 | int bdrv_get_flags(BlockDriverState *bs) |
2689 | { | |
2690 | return bs->open_flags; | |
2691 | } | |
2692 | ||
c6ca28d6 AL |
2693 | void bdrv_flush_all(void) |
2694 | { | |
2695 | BlockDriverState *bs; | |
2696 | ||
1b7bdbc1 | 2697 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
29cdb251 | 2698 | bdrv_flush(bs); |
1b7bdbc1 | 2699 | } |
c6ca28d6 AL |
2700 | } |
2701 | ||
f2feebbd KW |
2702 | int bdrv_has_zero_init(BlockDriverState *bs) |
2703 | { | |
2704 | assert(bs->drv); | |
2705 | ||
336c1c12 KW |
2706 | if (bs->drv->bdrv_has_zero_init) { |
2707 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
2708 | } |
2709 | ||
2710 | return 1; | |
2711 | } | |
2712 | ||
376ae3f1 SH |
2713 | typedef struct BdrvCoIsAllocatedData { |
2714 | BlockDriverState *bs; | |
2715 | int64_t sector_num; | |
2716 | int nb_sectors; | |
2717 | int *pnum; | |
2718 | int ret; | |
2719 | bool done; | |
2720 | } BdrvCoIsAllocatedData; | |
2721 | ||
f58c7b35 TS |
2722 | /* |
2723 | * Returns true iff the specified sector is present in the disk image. Drivers | |
2724 | * not implementing the functionality are assumed to not support backing files, | |
2725 | * hence all their sectors are reported as allocated. | |
2726 | * | |
bd9533e3 SH |
2727 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
2728 | * and 'pnum' is set to 0. | |
2729 | * | |
f58c7b35 TS |
2730 | * 'pnum' is set to the number of sectors (including and immediately following |
2731 | * the specified sector) that are known to be in the same | |
2732 | * allocated/unallocated state. | |
2733 | * | |
bd9533e3 SH |
2734 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
2735 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 2736 | */ |
060f51c9 SH |
2737 | int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
2738 | int nb_sectors, int *pnum) | |
f58c7b35 | 2739 | { |
bd9533e3 SH |
2740 | int64_t n; |
2741 | ||
2742 | if (sector_num >= bs->total_sectors) { | |
2743 | *pnum = 0; | |
2744 | return 0; | |
2745 | } | |
2746 | ||
2747 | n = bs->total_sectors - sector_num; | |
2748 | if (n < nb_sectors) { | |
2749 | nb_sectors = n; | |
2750 | } | |
2751 | ||
6aebab14 | 2752 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 2753 | *pnum = nb_sectors; |
f58c7b35 TS |
2754 | return 1; |
2755 | } | |
6aebab14 | 2756 | |
060f51c9 SH |
2757 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
2758 | } | |
2759 | ||
2760 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
2761 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
2762 | { | |
2763 | BdrvCoIsAllocatedData *data = opaque; | |
2764 | BlockDriverState *bs = data->bs; | |
2765 | ||
2766 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
2767 | data->pnum); | |
2768 | data->done = true; | |
2769 | } | |
2770 | ||
2771 | /* | |
2772 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
2773 | * | |
2774 | * See bdrv_co_is_allocated() for details. | |
2775 | */ | |
2776 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
2777 | int *pnum) | |
2778 | { | |
6aebab14 SH |
2779 | Coroutine *co; |
2780 | BdrvCoIsAllocatedData data = { | |
2781 | .bs = bs, | |
2782 | .sector_num = sector_num, | |
2783 | .nb_sectors = nb_sectors, | |
2784 | .pnum = pnum, | |
2785 | .done = false, | |
2786 | }; | |
2787 | ||
2788 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
2789 | qemu_coroutine_enter(co, &data); | |
2790 | while (!data.done) { | |
2791 | qemu_aio_wait(); | |
2792 | } | |
2793 | return data.ret; | |
f58c7b35 TS |
2794 | } |
2795 | ||
188a7bbf PB |
2796 | /* |
2797 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
2798 | * | |
2799 | * Return true if the given sector is allocated in any image between | |
2800 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
2801 | * sector is allocated in any image of the chain. Return false otherwise. | |
2802 | * | |
2803 | * 'pnum' is set to the number of sectors (including and immediately following | |
2804 | * the specified sector) that are known to be in the same | |
2805 | * allocated/unallocated state. | |
2806 | * | |
2807 | */ | |
2808 | int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, | |
2809 | BlockDriverState *base, | |
2810 | int64_t sector_num, | |
2811 | int nb_sectors, int *pnum) | |
2812 | { | |
2813 | BlockDriverState *intermediate; | |
2814 | int ret, n = nb_sectors; | |
2815 | ||
2816 | intermediate = top; | |
2817 | while (intermediate && intermediate != base) { | |
2818 | int pnum_inter; | |
2819 | ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors, | |
2820 | &pnum_inter); | |
2821 | if (ret < 0) { | |
2822 | return ret; | |
2823 | } else if (ret) { | |
2824 | *pnum = pnum_inter; | |
2825 | return 1; | |
2826 | } | |
2827 | ||
2828 | /* | |
2829 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
2830 | * might have | |
2831 | * | |
2832 | * [sector_num+x, nr_sectors] allocated. | |
2833 | */ | |
2834 | if (n > pnum_inter) { | |
2835 | n = pnum_inter; | |
2836 | } | |
2837 | ||
2838 | intermediate = intermediate->backing_hd; | |
2839 | } | |
2840 | ||
2841 | *pnum = n; | |
2842 | return 0; | |
2843 | } | |
2844 | ||
ac84adac | 2845 | BlockInfo *bdrv_query_info(BlockDriverState *bs) |
b338082b | 2846 | { |
ac84adac PB |
2847 | BlockInfo *info = g_malloc0(sizeof(*info)); |
2848 | info->device = g_strdup(bs->device_name); | |
2849 | info->type = g_strdup("unknown"); | |
2850 | info->locked = bdrv_dev_is_medium_locked(bs); | |
2851 | info->removable = bdrv_dev_has_removable_media(bs); | |
b338082b | 2852 | |
ac84adac PB |
2853 | if (bdrv_dev_has_removable_media(bs)) { |
2854 | info->has_tray_open = true; | |
2855 | info->tray_open = bdrv_dev_is_tray_open(bs); | |
2856 | } | |
d15e5465 | 2857 | |
ac84adac PB |
2858 | if (bdrv_iostatus_is_enabled(bs)) { |
2859 | info->has_io_status = true; | |
2860 | info->io_status = bs->iostatus; | |
2861 | } | |
d15e5465 | 2862 | |
b9a9b3a4 PB |
2863 | if (bs->dirty_bitmap) { |
2864 | info->has_dirty = true; | |
2865 | info->dirty = g_malloc0(sizeof(*info->dirty)); | |
2866 | info->dirty->count = bdrv_get_dirty_count(bs) * | |
2867 | BDRV_SECTORS_PER_DIRTY_CHUNK * BDRV_SECTOR_SIZE; | |
2868 | } | |
d15e5465 | 2869 | |
ac84adac PB |
2870 | if (bs->drv) { |
2871 | info->has_inserted = true; | |
2872 | info->inserted = g_malloc0(sizeof(*info->inserted)); | |
2873 | info->inserted->file = g_strdup(bs->filename); | |
2874 | info->inserted->ro = bs->read_only; | |
2875 | info->inserted->drv = g_strdup(bs->drv->format_name); | |
2876 | info->inserted->encrypted = bs->encrypted; | |
2877 | info->inserted->encryption_key_missing = bdrv_key_required(bs); | |
2878 | ||
2879 | if (bs->backing_file[0]) { | |
2880 | info->inserted->has_backing_file = true; | |
2881 | info->inserted->backing_file = g_strdup(bs->backing_file); | |
e4def80b | 2882 | } |
f04ef601 | 2883 | |
ac84adac PB |
2884 | info->inserted->backing_file_depth = bdrv_get_backing_file_depth(bs); |
2885 | ||
2886 | if (bs->io_limits_enabled) { | |
2887 | info->inserted->bps = | |
2888 | bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
2889 | info->inserted->bps_rd = | |
2890 | bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; | |
2891 | info->inserted->bps_wr = | |
2892 | bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; | |
2893 | info->inserted->iops = | |
2894 | bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
2895 | info->inserted->iops_rd = | |
2896 | bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; | |
2897 | info->inserted->iops_wr = | |
2898 | bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; | |
f04ef601 | 2899 | } |
ac84adac PB |
2900 | } |
2901 | return info; | |
2902 | } | |
f04ef601 | 2903 | |
ac84adac PB |
2904 | BlockInfoList *qmp_query_block(Error **errp) |
2905 | { | |
2906 | BlockInfoList *head = NULL, **p_next = &head; | |
2907 | BlockDriverState *bs; | |
727f005e | 2908 | |
ac84adac PB |
2909 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2910 | BlockInfoList *info = g_malloc0(sizeof(*info)); | |
2911 | info->value = bdrv_query_info(bs); | |
d15e5465 | 2912 | |
ac84adac PB |
2913 | *p_next = info; |
2914 | p_next = &info->next; | |
b338082b | 2915 | } |
d15e5465 | 2916 | |
b2023818 | 2917 | return head; |
b338082b | 2918 | } |
a36e69dd | 2919 | |
9887b616 | 2920 | BlockStats *bdrv_query_stats(const BlockDriverState *bs) |
f11f57e4 LC |
2921 | { |
2922 | BlockStats *s; | |
2923 | ||
2924 | s = g_malloc0(sizeof(*s)); | |
2925 | ||
2926 | if (bs->device_name[0]) { | |
2927 | s->has_device = true; | |
2928 | s->device = g_strdup(bs->device_name); | |
294cc35f KW |
2929 | } |
2930 | ||
f11f57e4 LC |
2931 | s->stats = g_malloc0(sizeof(*s->stats)); |
2932 | s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; | |
2933 | s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; | |
2934 | s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; | |
2935 | s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; | |
2936 | s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; | |
2937 | s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; | |
2938 | s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; | |
2939 | s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; | |
2940 | s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; | |
2941 | ||
294cc35f | 2942 | if (bs->file) { |
f11f57e4 | 2943 | s->has_parent = true; |
9887b616 | 2944 | s->parent = bdrv_query_stats(bs->file); |
294cc35f KW |
2945 | } |
2946 | ||
f11f57e4 | 2947 | return s; |
294cc35f KW |
2948 | } |
2949 | ||
f11f57e4 | 2950 | BlockStatsList *qmp_query_blockstats(Error **errp) |
218a536a | 2951 | { |
9887b616 | 2952 | BlockStatsList *head = NULL, **p_next = &head; |
a36e69dd TS |
2953 | BlockDriverState *bs; |
2954 | ||
1b7bdbc1 | 2955 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f11f57e4 | 2956 | BlockStatsList *info = g_malloc0(sizeof(*info)); |
9887b616 | 2957 | info->value = bdrv_query_stats(bs); |
f11f57e4 | 2958 | |
9887b616 PB |
2959 | *p_next = info; |
2960 | p_next = &info->next; | |
a36e69dd | 2961 | } |
218a536a | 2962 | |
f11f57e4 | 2963 | return head; |
a36e69dd | 2964 | } |
ea2384d3 | 2965 | |
045df330 AL |
2966 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
2967 | { | |
2968 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2969 | return bs->backing_file; | |
2970 | else if (bs->encrypted) | |
2971 | return bs->filename; | |
2972 | else | |
2973 | return NULL; | |
2974 | } | |
2975 | ||
5fafdf24 | 2976 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
2977 | char *filename, int filename_size) |
2978 | { | |
3574c608 | 2979 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
2980 | } |
2981 | ||
5fafdf24 | 2982 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
2983 | const uint8_t *buf, int nb_sectors) |
2984 | { | |
2985 | BlockDriver *drv = bs->drv; | |
2986 | if (!drv) | |
19cb3738 | 2987 | return -ENOMEDIUM; |
faea38e7 FB |
2988 | if (!drv->bdrv_write_compressed) |
2989 | return -ENOTSUP; | |
fbb7b4e0 KW |
2990 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2991 | return -EIO; | |
a55eb92c | 2992 | |
1755da16 | 2993 | assert(!bs->dirty_bitmap); |
a55eb92c | 2994 | |
faea38e7 FB |
2995 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
2996 | } | |
3b46e624 | 2997 | |
faea38e7 FB |
2998 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
2999 | { | |
3000 | BlockDriver *drv = bs->drv; | |
3001 | if (!drv) | |
19cb3738 | 3002 | return -ENOMEDIUM; |
faea38e7 FB |
3003 | if (!drv->bdrv_get_info) |
3004 | return -ENOTSUP; | |
3005 | memset(bdi, 0, sizeof(*bdi)); | |
3006 | return drv->bdrv_get_info(bs, bdi); | |
3007 | } | |
3008 | ||
45566e9c CH |
3009 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3010 | int64_t pos, int size) | |
178e08a5 AL |
3011 | { |
3012 | BlockDriver *drv = bs->drv; | |
3013 | if (!drv) | |
3014 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3015 | if (drv->bdrv_save_vmstate) |
3016 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
3017 | if (bs->file) | |
3018 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
3019 | return -ENOTSUP; | |
178e08a5 AL |
3020 | } |
3021 | ||
45566e9c CH |
3022 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
3023 | int64_t pos, int size) | |
178e08a5 AL |
3024 | { |
3025 | BlockDriver *drv = bs->drv; | |
3026 | if (!drv) | |
3027 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3028 | if (drv->bdrv_load_vmstate) |
3029 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
3030 | if (bs->file) | |
3031 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
3032 | return -ENOTSUP; | |
178e08a5 AL |
3033 | } |
3034 | ||
8b9b0cc2 KW |
3035 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
3036 | { | |
3037 | BlockDriver *drv = bs->drv; | |
3038 | ||
3039 | if (!drv || !drv->bdrv_debug_event) { | |
3040 | return; | |
3041 | } | |
3042 | ||
0ed8b6f6 | 3043 | drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
3044 | } |
3045 | ||
3046 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
3047 | const char *tag) | |
3048 | { | |
3049 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
3050 | bs = bs->file; | |
3051 | } | |
3052 | ||
3053 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
3054 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3055 | } | |
3056 | ||
3057 | return -ENOTSUP; | |
3058 | } | |
3059 | ||
3060 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) | |
3061 | { | |
3062 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
3063 | bs = bs->file; | |
3064 | } | |
8b9b0cc2 | 3065 | |
41c695c7 KW |
3066 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3067 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3068 | } | |
3069 | ||
3070 | return -ENOTSUP; | |
3071 | } | |
3072 | ||
3073 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
3074 | { | |
3075 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
3076 | bs = bs->file; | |
3077 | } | |
3078 | ||
3079 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
3080 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3081 | } | |
3082 | ||
3083 | return false; | |
8b9b0cc2 KW |
3084 | } |
3085 | ||
faea38e7 FB |
3086 | /**************************************************************/ |
3087 | /* handling of snapshots */ | |
3088 | ||
feeee5ac MDCF |
3089 | int bdrv_can_snapshot(BlockDriverState *bs) |
3090 | { | |
3091 | BlockDriver *drv = bs->drv; | |
07b70bfb | 3092 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
feeee5ac MDCF |
3093 | return 0; |
3094 | } | |
3095 | ||
3096 | if (!drv->bdrv_snapshot_create) { | |
3097 | if (bs->file != NULL) { | |
3098 | return bdrv_can_snapshot(bs->file); | |
3099 | } | |
3100 | return 0; | |
3101 | } | |
3102 | ||
3103 | return 1; | |
3104 | } | |
3105 | ||
199630b6 BS |
3106 | int bdrv_is_snapshot(BlockDriverState *bs) |
3107 | { | |
3108 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
3109 | } | |
3110 | ||
f9092b10 MA |
3111 | BlockDriverState *bdrv_snapshots(void) |
3112 | { | |
3113 | BlockDriverState *bs; | |
3114 | ||
3ac906f7 | 3115 | if (bs_snapshots) { |
f9092b10 | 3116 | return bs_snapshots; |
3ac906f7 | 3117 | } |
f9092b10 MA |
3118 | |
3119 | bs = NULL; | |
3120 | while ((bs = bdrv_next(bs))) { | |
3121 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
3122 | bs_snapshots = bs; |
3123 | return bs; | |
f9092b10 MA |
3124 | } |
3125 | } | |
3126 | return NULL; | |
f9092b10 MA |
3127 | } |
3128 | ||
5fafdf24 | 3129 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
3130 | QEMUSnapshotInfo *sn_info) |
3131 | { | |
3132 | BlockDriver *drv = bs->drv; | |
3133 | if (!drv) | |
19cb3738 | 3134 | return -ENOMEDIUM; |
7cdb1f6d MK |
3135 | if (drv->bdrv_snapshot_create) |
3136 | return drv->bdrv_snapshot_create(bs, sn_info); | |
3137 | if (bs->file) | |
3138 | return bdrv_snapshot_create(bs->file, sn_info); | |
3139 | return -ENOTSUP; | |
faea38e7 FB |
3140 | } |
3141 | ||
5fafdf24 | 3142 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
3143 | const char *snapshot_id) |
3144 | { | |
3145 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
3146 | int ret, open_ret; |
3147 | ||
faea38e7 | 3148 | if (!drv) |
19cb3738 | 3149 | return -ENOMEDIUM; |
7cdb1f6d MK |
3150 | if (drv->bdrv_snapshot_goto) |
3151 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
3152 | ||
3153 | if (bs->file) { | |
3154 | drv->bdrv_close(bs); | |
3155 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
3156 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
3157 | if (open_ret < 0) { | |
3158 | bdrv_delete(bs->file); | |
3159 | bs->drv = NULL; | |
3160 | return open_ret; | |
3161 | } | |
3162 | return ret; | |
3163 | } | |
3164 | ||
3165 | return -ENOTSUP; | |
faea38e7 FB |
3166 | } |
3167 | ||
3168 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
3169 | { | |
3170 | BlockDriver *drv = bs->drv; | |
3171 | if (!drv) | |
19cb3738 | 3172 | return -ENOMEDIUM; |
7cdb1f6d MK |
3173 | if (drv->bdrv_snapshot_delete) |
3174 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
3175 | if (bs->file) | |
3176 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
3177 | return -ENOTSUP; | |
faea38e7 FB |
3178 | } |
3179 | ||
5fafdf24 | 3180 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
3181 | QEMUSnapshotInfo **psn_info) |
3182 | { | |
3183 | BlockDriver *drv = bs->drv; | |
3184 | if (!drv) | |
19cb3738 | 3185 | return -ENOMEDIUM; |
7cdb1f6d MK |
3186 | if (drv->bdrv_snapshot_list) |
3187 | return drv->bdrv_snapshot_list(bs, psn_info); | |
3188 | if (bs->file) | |
3189 | return bdrv_snapshot_list(bs->file, psn_info); | |
3190 | return -ENOTSUP; | |
faea38e7 FB |
3191 | } |
3192 | ||
51ef6727 | 3193 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
3194 | const char *snapshot_name) | |
3195 | { | |
3196 | BlockDriver *drv = bs->drv; | |
3197 | if (!drv) { | |
3198 | return -ENOMEDIUM; | |
3199 | } | |
3200 | if (!bs->read_only) { | |
3201 | return -EINVAL; | |
3202 | } | |
3203 | if (drv->bdrv_snapshot_load_tmp) { | |
3204 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
3205 | } | |
3206 | return -ENOTSUP; | |
3207 | } | |
3208 | ||
b1b1d783 JC |
3209 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3210 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3211 | * from a BDS as backing_file should not be done, as that may be relative to | |
3212 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
3213 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
3214 | const char *backing_file) | |
3215 | { | |
b1b1d783 JC |
3216 | char *filename_full = NULL; |
3217 | char *backing_file_full = NULL; | |
3218 | char *filename_tmp = NULL; | |
3219 | int is_protocol = 0; | |
3220 | BlockDriverState *curr_bs = NULL; | |
3221 | BlockDriverState *retval = NULL; | |
3222 | ||
3223 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
3224 | return NULL; |
3225 | } | |
3226 | ||
b1b1d783 JC |
3227 | filename_full = g_malloc(PATH_MAX); |
3228 | backing_file_full = g_malloc(PATH_MAX); | |
3229 | filename_tmp = g_malloc(PATH_MAX); | |
3230 | ||
3231 | is_protocol = path_has_protocol(backing_file); | |
3232 | ||
3233 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
3234 | ||
3235 | /* If either of the filename paths is actually a protocol, then | |
3236 | * compare unmodified paths; otherwise make paths relative */ | |
3237 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3238 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
3239 | retval = curr_bs->backing_hd; | |
3240 | break; | |
3241 | } | |
e8a6bb9c | 3242 | } else { |
b1b1d783 JC |
3243 | /* If not an absolute filename path, make it relative to the current |
3244 | * image's filename path */ | |
3245 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3246 | backing_file); | |
3247 | ||
3248 | /* We are going to compare absolute pathnames */ | |
3249 | if (!realpath(filename_tmp, filename_full)) { | |
3250 | continue; | |
3251 | } | |
3252 | ||
3253 | /* We need to make sure the backing filename we are comparing against | |
3254 | * is relative to the current image filename (or absolute) */ | |
3255 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3256 | curr_bs->backing_file); | |
3257 | ||
3258 | if (!realpath(filename_tmp, backing_file_full)) { | |
3259 | continue; | |
3260 | } | |
3261 | ||
3262 | if (strcmp(backing_file_full, filename_full) == 0) { | |
3263 | retval = curr_bs->backing_hd; | |
3264 | break; | |
3265 | } | |
e8a6bb9c MT |
3266 | } |
3267 | } | |
3268 | ||
b1b1d783 JC |
3269 | g_free(filename_full); |
3270 | g_free(backing_file_full); | |
3271 | g_free(filename_tmp); | |
3272 | return retval; | |
e8a6bb9c MT |
3273 | } |
3274 | ||
f198fd1c BC |
3275 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
3276 | { | |
3277 | if (!bs->drv) { | |
3278 | return 0; | |
3279 | } | |
3280 | ||
3281 | if (!bs->backing_hd) { | |
3282 | return 0; | |
3283 | } | |
3284 | ||
3285 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
3286 | } | |
3287 | ||
79fac568 JC |
3288 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
3289 | { | |
3290 | BlockDriverState *curr_bs = NULL; | |
3291 | ||
3292 | if (!bs) { | |
3293 | return NULL; | |
3294 | } | |
3295 | ||
3296 | curr_bs = bs; | |
3297 | ||
3298 | while (curr_bs->backing_hd) { | |
3299 | curr_bs = curr_bs->backing_hd; | |
3300 | } | |
3301 | return curr_bs; | |
3302 | } | |
3303 | ||
faea38e7 FB |
3304 | #define NB_SUFFIXES 4 |
3305 | ||
3306 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
3307 | { | |
3308 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
3309 | int64_t base; | |
3310 | int i; | |
3311 | ||
3312 | if (size <= 999) { | |
3313 | snprintf(buf, buf_size, "%" PRId64, size); | |
3314 | } else { | |
3315 | base = 1024; | |
3316 | for(i = 0; i < NB_SUFFIXES; i++) { | |
3317 | if (size < (10 * base)) { | |
5fafdf24 | 3318 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
3319 | (double)size / base, |
3320 | suffixes[i]); | |
3321 | break; | |
3322 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 3323 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
3324 | ((size + (base >> 1)) / base), |
3325 | suffixes[i]); | |
3326 | break; | |
3327 | } | |
3328 | base = base * 1024; | |
3329 | } | |
3330 | } | |
3331 | return buf; | |
3332 | } | |
3333 | ||
3334 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
3335 | { | |
3336 | char buf1[128], date_buf[128], clock_buf[128]; | |
3337 | struct tm tm; | |
3338 | time_t ti; | |
3339 | int64_t secs; | |
3340 | ||
3341 | if (!sn) { | |
5fafdf24 TS |
3342 | snprintf(buf, buf_size, |
3343 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
3344 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
3345 | } else { | |
3346 | ti = sn->date_sec; | |
3347 | localtime_r(&ti, &tm); | |
3348 | strftime(date_buf, sizeof(date_buf), | |
3349 | "%Y-%m-%d %H:%M:%S", &tm); | |
3350 | secs = sn->vm_clock_nsec / 1000000000; | |
3351 | snprintf(clock_buf, sizeof(clock_buf), | |
3352 | "%02d:%02d:%02d.%03d", | |
3353 | (int)(secs / 3600), | |
3354 | (int)((secs / 60) % 60), | |
5fafdf24 | 3355 | (int)(secs % 60), |
faea38e7 FB |
3356 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
3357 | snprintf(buf, buf_size, | |
5fafdf24 | 3358 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
3359 | sn->id_str, sn->name, |
3360 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
3361 | date_buf, | |
3362 | clock_buf); | |
3363 | } | |
3364 | return buf; | |
3365 | } | |
3366 | ||
ea2384d3 | 3367 | /**************************************************************/ |
83f64091 | 3368 | /* async I/Os */ |
ea2384d3 | 3369 | |
3b69e4b9 | 3370 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3371 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3372 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3373 | { |
bbf0a440 SH |
3374 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3375 | ||
b2a61371 | 3376 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3377 | cb, opaque, false); |
ea2384d3 FB |
3378 | } |
3379 | ||
f141eafe AL |
3380 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3381 | QEMUIOVector *qiov, int nb_sectors, | |
3382 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3383 | { |
bbf0a440 SH |
3384 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3385 | ||
1a6e115b | 3386 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3387 | cb, opaque, true); |
83f64091 FB |
3388 | } |
3389 | ||
40b4f539 KW |
3390 | |
3391 | typedef struct MultiwriteCB { | |
3392 | int error; | |
3393 | int num_requests; | |
3394 | int num_callbacks; | |
3395 | struct { | |
3396 | BlockDriverCompletionFunc *cb; | |
3397 | void *opaque; | |
3398 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3399 | } callbacks[]; |
3400 | } MultiwriteCB; | |
3401 | ||
3402 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3403 | { | |
3404 | int i; | |
3405 | ||
3406 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3407 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3408 | if (mcb->callbacks[i].free_qiov) { |
3409 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3410 | } | |
7267c094 | 3411 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3412 | } |
3413 | } | |
3414 | ||
3415 | static void multiwrite_cb(void *opaque, int ret) | |
3416 | { | |
3417 | MultiwriteCB *mcb = opaque; | |
3418 | ||
6d519a5f SH |
3419 | trace_multiwrite_cb(mcb, ret); |
3420 | ||
cb6d3ca0 | 3421 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3422 | mcb->error = ret; |
40b4f539 KW |
3423 | } |
3424 | ||
3425 | mcb->num_requests--; | |
3426 | if (mcb->num_requests == 0) { | |
de189a1b | 3427 | multiwrite_user_cb(mcb); |
7267c094 | 3428 | g_free(mcb); |
40b4f539 KW |
3429 | } |
3430 | } | |
3431 | ||
3432 | static int multiwrite_req_compare(const void *a, const void *b) | |
3433 | { | |
77be4366 CH |
3434 | const BlockRequest *req1 = a, *req2 = b; |
3435 | ||
3436 | /* | |
3437 | * Note that we can't simply subtract req2->sector from req1->sector | |
3438 | * here as that could overflow the return value. | |
3439 | */ | |
3440 | if (req1->sector > req2->sector) { | |
3441 | return 1; | |
3442 | } else if (req1->sector < req2->sector) { | |
3443 | return -1; | |
3444 | } else { | |
3445 | return 0; | |
3446 | } | |
40b4f539 KW |
3447 | } |
3448 | ||
3449 | /* | |
3450 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3451 | * requests that remain after merging. | |
3452 | */ | |
3453 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3454 | int num_reqs, MultiwriteCB *mcb) | |
3455 | { | |
3456 | int i, outidx; | |
3457 | ||
3458 | // Sort requests by start sector | |
3459 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3460 | ||
3461 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3462 | // filling up gaps with zero sectors. | |
3463 | outidx = 0; | |
3464 | for (i = 1; i < num_reqs; i++) { | |
3465 | int merge = 0; | |
3466 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3467 | ||
b6a127a1 | 3468 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3469 | if (reqs[i].sector <= oldreq_last) { |
3470 | merge = 1; | |
3471 | } | |
3472 | ||
e2a305fb CH |
3473 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3474 | merge = 0; | |
3475 | } | |
3476 | ||
40b4f539 KW |
3477 | if (merge) { |
3478 | size_t size; | |
7267c094 | 3479 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3480 | qemu_iovec_init(qiov, |
3481 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3482 | ||
3483 | // Add the first request to the merged one. If the requests are | |
3484 | // overlapping, drop the last sectors of the first request. | |
3485 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 3486 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 3487 | |
b6a127a1 PB |
3488 | // We should need to add any zeros between the two requests |
3489 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3490 | |
3491 | // Add the second request | |
1b093c48 | 3492 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 3493 | |
cbf1dff2 | 3494 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3495 | reqs[outidx].qiov = qiov; |
3496 | ||
3497 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3498 | } else { | |
3499 | outidx++; | |
3500 | reqs[outidx].sector = reqs[i].sector; | |
3501 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3502 | reqs[outidx].qiov = reqs[i].qiov; | |
3503 | } | |
3504 | } | |
3505 | ||
3506 | return outidx + 1; | |
3507 | } | |
3508 | ||
3509 | /* | |
3510 | * Submit multiple AIO write requests at once. | |
3511 | * | |
3512 | * On success, the function returns 0 and all requests in the reqs array have | |
3513 | * been submitted. In error case this function returns -1, and any of the | |
3514 | * requests may or may not be submitted yet. In particular, this means that the | |
3515 | * callback will be called for some of the requests, for others it won't. The | |
3516 | * caller must check the error field of the BlockRequest to wait for the right | |
3517 | * callbacks (if error != 0, no callback will be called). | |
3518 | * | |
3519 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3520 | * requests. However, the fields opaque and error are left unmodified as they | |
3521 | * are used to signal failure for a single request to the caller. | |
3522 | */ | |
3523 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3524 | { | |
40b4f539 KW |
3525 | MultiwriteCB *mcb; |
3526 | int i; | |
3527 | ||
301db7c2 RH |
3528 | /* don't submit writes if we don't have a medium */ |
3529 | if (bs->drv == NULL) { | |
3530 | for (i = 0; i < num_reqs; i++) { | |
3531 | reqs[i].error = -ENOMEDIUM; | |
3532 | } | |
3533 | return -1; | |
3534 | } | |
3535 | ||
40b4f539 KW |
3536 | if (num_reqs == 0) { |
3537 | return 0; | |
3538 | } | |
3539 | ||
3540 | // Create MultiwriteCB structure | |
7267c094 | 3541 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3542 | mcb->num_requests = 0; |
3543 | mcb->num_callbacks = num_reqs; | |
3544 | ||
3545 | for (i = 0; i < num_reqs; i++) { | |
3546 | mcb->callbacks[i].cb = reqs[i].cb; | |
3547 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3548 | } | |
3549 | ||
3550 | // Check for mergable requests | |
3551 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3552 | ||
6d519a5f SH |
3553 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3554 | ||
df9309fb PB |
3555 | /* Run the aio requests. */ |
3556 | mcb->num_requests = num_reqs; | |
40b4f539 | 3557 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3558 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3559 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3560 | } |
3561 | ||
3562 | return 0; | |
40b4f539 KW |
3563 | } |
3564 | ||
83f64091 | 3565 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3566 | { |
d7331bed | 3567 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
3568 | } |
3569 | ||
98f90dba ZYW |
3570 | /* block I/O throttling */ |
3571 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, | |
3572 | bool is_write, double elapsed_time, uint64_t *wait) | |
3573 | { | |
3574 | uint64_t bps_limit = 0; | |
3575 | double bytes_limit, bytes_base, bytes_res; | |
3576 | double slice_time, wait_time; | |
3577 | ||
3578 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3579 | bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
3580 | } else if (bs->io_limits.bps[is_write]) { | |
3581 | bps_limit = bs->io_limits.bps[is_write]; | |
3582 | } else { | |
3583 | if (wait) { | |
3584 | *wait = 0; | |
3585 | } | |
3586 | ||
3587 | return false; | |
3588 | } | |
3589 | ||
3590 | slice_time = bs->slice_end - bs->slice_start; | |
3591 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3592 | bytes_limit = bps_limit * slice_time; | |
3593 | bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; | |
3594 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3595 | bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; | |
3596 | } | |
3597 | ||
3598 | /* bytes_base: the bytes of data which have been read/written; and | |
3599 | * it is obtained from the history statistic info. | |
3600 | * bytes_res: the remaining bytes of data which need to be read/written. | |
3601 | * (bytes_base + bytes_res) / bps_limit: used to calcuate | |
3602 | * the total time for completing reading/writting all data. | |
3603 | */ | |
3604 | bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
3605 | ||
3606 | if (bytes_base + bytes_res <= bytes_limit) { | |
3607 | if (wait) { | |
3608 | *wait = 0; | |
3609 | } | |
3610 | ||
3611 | return false; | |
3612 | } | |
3613 | ||
3614 | /* Calc approx time to dispatch */ | |
3615 | wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; | |
3616 | ||
3617 | /* When the I/O rate at runtime exceeds the limits, | |
3618 | * bs->slice_end need to be extended in order that the current statistic | |
3619 | * info can be kept until the timer fire, so it is increased and tuned | |
3620 | * based on the result of experiment. | |
3621 | */ | |
3622 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3623 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3624 | if (wait) { | |
3625 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3626 | } | |
3627 | ||
3628 | return true; | |
3629 | } | |
3630 | ||
3631 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
3632 | double elapsed_time, uint64_t *wait) | |
3633 | { | |
3634 | uint64_t iops_limit = 0; | |
3635 | double ios_limit, ios_base; | |
3636 | double slice_time, wait_time; | |
3637 | ||
3638 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3639 | iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
3640 | } else if (bs->io_limits.iops[is_write]) { | |
3641 | iops_limit = bs->io_limits.iops[is_write]; | |
3642 | } else { | |
3643 | if (wait) { | |
3644 | *wait = 0; | |
3645 | } | |
3646 | ||
3647 | return false; | |
3648 | } | |
3649 | ||
3650 | slice_time = bs->slice_end - bs->slice_start; | |
3651 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3652 | ios_limit = iops_limit * slice_time; | |
3653 | ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; | |
3654 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3655 | ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; | |
3656 | } | |
3657 | ||
3658 | if (ios_base + 1 <= ios_limit) { | |
3659 | if (wait) { | |
3660 | *wait = 0; | |
3661 | } | |
3662 | ||
3663 | return false; | |
3664 | } | |
3665 | ||
3666 | /* Calc approx time to dispatch */ | |
3667 | wait_time = (ios_base + 1) / iops_limit; | |
3668 | if (wait_time > elapsed_time) { | |
3669 | wait_time = wait_time - elapsed_time; | |
3670 | } else { | |
3671 | wait_time = 0; | |
3672 | } | |
3673 | ||
3674 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3675 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3676 | if (wait) { | |
3677 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3678 | } | |
3679 | ||
3680 | return true; | |
3681 | } | |
3682 | ||
3683 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
3684 | bool is_write, int64_t *wait) | |
3685 | { | |
3686 | int64_t now, max_wait; | |
3687 | uint64_t bps_wait = 0, iops_wait = 0; | |
3688 | double elapsed_time; | |
3689 | int bps_ret, iops_ret; | |
3690 | ||
3691 | now = qemu_get_clock_ns(vm_clock); | |
3692 | if ((bs->slice_start < now) | |
3693 | && (bs->slice_end > now)) { | |
3694 | bs->slice_end = now + bs->slice_time; | |
3695 | } else { | |
3696 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
3697 | bs->slice_start = now; | |
3698 | bs->slice_end = now + bs->slice_time; | |
3699 | ||
3700 | bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; | |
3701 | bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; | |
3702 | ||
3703 | bs->io_base.ios[is_write] = bs->nr_ops[is_write]; | |
3704 | bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; | |
3705 | } | |
3706 | ||
3707 | elapsed_time = now - bs->slice_start; | |
3708 | elapsed_time /= (NANOSECONDS_PER_SECOND); | |
3709 | ||
3710 | bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, | |
3711 | is_write, elapsed_time, &bps_wait); | |
3712 | iops_ret = bdrv_exceed_iops_limits(bs, is_write, | |
3713 | elapsed_time, &iops_wait); | |
3714 | if (bps_ret || iops_ret) { | |
3715 | max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; | |
3716 | if (wait) { | |
3717 | *wait = max_wait; | |
3718 | } | |
3719 | ||
3720 | now = qemu_get_clock_ns(vm_clock); | |
3721 | if (bs->slice_end < now + max_wait) { | |
3722 | bs->slice_end = now + max_wait; | |
3723 | } | |
3724 | ||
3725 | return true; | |
3726 | } | |
3727 | ||
3728 | if (wait) { | |
3729 | *wait = 0; | |
3730 | } | |
3731 | ||
3732 | return false; | |
3733 | } | |
ce1a14dc | 3734 | |
83f64091 FB |
3735 | /**************************************************************/ |
3736 | /* async block device emulation */ | |
3737 | ||
c16b5a2c CH |
3738 | typedef struct BlockDriverAIOCBSync { |
3739 | BlockDriverAIOCB common; | |
3740 | QEMUBH *bh; | |
3741 | int ret; | |
3742 | /* vector translation state */ | |
3743 | QEMUIOVector *qiov; | |
3744 | uint8_t *bounce; | |
3745 | int is_write; | |
3746 | } BlockDriverAIOCBSync; | |
3747 | ||
3748 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3749 | { | |
b666d239 KW |
3750 | BlockDriverAIOCBSync *acb = |
3751 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3752 | qemu_bh_delete(acb->bh); |
36afc451 | 3753 | acb->bh = NULL; |
c16b5a2c CH |
3754 | qemu_aio_release(acb); |
3755 | } | |
3756 | ||
d7331bed | 3757 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
3758 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
3759 | .cancel = bdrv_aio_cancel_em, | |
3760 | }; | |
3761 | ||
ce1a14dc | 3762 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3763 | { |
ce1a14dc | 3764 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3765 | |
f141eafe | 3766 | if (!acb->is_write) |
03396148 | 3767 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 3768 | qemu_vfree(acb->bounce); |
ce1a14dc | 3769 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3770 | qemu_bh_delete(acb->bh); |
36afc451 | 3771 | acb->bh = NULL; |
ce1a14dc | 3772 | qemu_aio_release(acb); |
83f64091 | 3773 | } |
beac80cd | 3774 | |
f141eafe AL |
3775 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3776 | int64_t sector_num, | |
3777 | QEMUIOVector *qiov, | |
3778 | int nb_sectors, | |
3779 | BlockDriverCompletionFunc *cb, | |
3780 | void *opaque, | |
3781 | int is_write) | |
3782 | ||
83f64091 | 3783 | { |
ce1a14dc | 3784 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3785 | |
d7331bed | 3786 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
3787 | acb->is_write = is_write; |
3788 | acb->qiov = qiov; | |
e268ca52 | 3789 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3790 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3791 | |
3792 | if (is_write) { | |
d5e6b161 | 3793 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 3794 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3795 | } else { |
1ed20acf | 3796 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3797 | } |
3798 | ||
ce1a14dc | 3799 | qemu_bh_schedule(acb->bh); |
f141eafe | 3800 | |
ce1a14dc | 3801 | return &acb->common; |
beac80cd FB |
3802 | } |
3803 | ||
f141eafe AL |
3804 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3805 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3806 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3807 | { |
f141eafe AL |
3808 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3809 | } | |
83f64091 | 3810 | |
f141eafe AL |
3811 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3812 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3813 | BlockDriverCompletionFunc *cb, void *opaque) | |
3814 | { | |
3815 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3816 | } |
beac80cd | 3817 | |
68485420 KW |
3818 | |
3819 | typedef struct BlockDriverAIOCBCoroutine { | |
3820 | BlockDriverAIOCB common; | |
3821 | BlockRequest req; | |
3822 | bool is_write; | |
d318aea9 | 3823 | bool *done; |
68485420 KW |
3824 | QEMUBH* bh; |
3825 | } BlockDriverAIOCBCoroutine; | |
3826 | ||
3827 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3828 | { | |
d318aea9 KW |
3829 | BlockDriverAIOCBCoroutine *acb = |
3830 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
3831 | bool done = false; | |
3832 | ||
3833 | acb->done = &done; | |
3834 | while (!done) { | |
3835 | qemu_aio_wait(); | |
3836 | } | |
68485420 KW |
3837 | } |
3838 | ||
d7331bed | 3839 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
3840 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
3841 | .cancel = bdrv_aio_co_cancel_em, | |
3842 | }; | |
3843 | ||
35246a68 | 3844 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3845 | { |
3846 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3847 | ||
3848 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
3849 | |
3850 | if (acb->done) { | |
3851 | *acb->done = true; | |
3852 | } | |
3853 | ||
68485420 KW |
3854 | qemu_bh_delete(acb->bh); |
3855 | qemu_aio_release(acb); | |
3856 | } | |
3857 | ||
b2a61371 SH |
3858 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3859 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3860 | { | |
3861 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3862 | BlockDriverState *bs = acb->common.bs; | |
3863 | ||
3864 | if (!acb->is_write) { | |
3865 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3866 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3867 | } else { |
3868 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3869 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3870 | } |
3871 | ||
35246a68 | 3872 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3873 | qemu_bh_schedule(acb->bh); |
3874 | } | |
3875 | ||
68485420 KW |
3876 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3877 | int64_t sector_num, | |
3878 | QEMUIOVector *qiov, | |
3879 | int nb_sectors, | |
3880 | BlockDriverCompletionFunc *cb, | |
3881 | void *opaque, | |
8c5873d6 | 3882 | bool is_write) |
68485420 KW |
3883 | { |
3884 | Coroutine *co; | |
3885 | BlockDriverAIOCBCoroutine *acb; | |
3886 | ||
d7331bed | 3887 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
3888 | acb->req.sector = sector_num; |
3889 | acb->req.nb_sectors = nb_sectors; | |
3890 | acb->req.qiov = qiov; | |
3891 | acb->is_write = is_write; | |
d318aea9 | 3892 | acb->done = NULL; |
68485420 | 3893 | |
8c5873d6 | 3894 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3895 | qemu_coroutine_enter(co, acb); |
3896 | ||
3897 | return &acb->common; | |
3898 | } | |
3899 | ||
07f07615 | 3900 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3901 | { |
07f07615 PB |
3902 | BlockDriverAIOCBCoroutine *acb = opaque; |
3903 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3904 | |
07f07615 PB |
3905 | acb->req.error = bdrv_co_flush(bs); |
3906 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3907 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3908 | } |
3909 | ||
07f07615 | 3910 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3911 | BlockDriverCompletionFunc *cb, void *opaque) |
3912 | { | |
07f07615 | 3913 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3914 | |
07f07615 PB |
3915 | Coroutine *co; |
3916 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3917 | |
d7331bed | 3918 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
3919 | acb->done = NULL; |
3920 | ||
07f07615 PB |
3921 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
3922 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3923 | |
016f5cf6 AG |
3924 | return &acb->common; |
3925 | } | |
3926 | ||
4265d620 PB |
3927 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3928 | { | |
3929 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3930 | BlockDriverState *bs = acb->common.bs; | |
3931 | ||
3932 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3933 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3934 | qemu_bh_schedule(acb->bh); | |
3935 | } | |
3936 | ||
3937 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3938 | int64_t sector_num, int nb_sectors, | |
3939 | BlockDriverCompletionFunc *cb, void *opaque) | |
3940 | { | |
3941 | Coroutine *co; | |
3942 | BlockDriverAIOCBCoroutine *acb; | |
3943 | ||
3944 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3945 | ||
d7331bed | 3946 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
3947 | acb->req.sector = sector_num; |
3948 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 3949 | acb->done = NULL; |
4265d620 PB |
3950 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
3951 | qemu_coroutine_enter(co, acb); | |
3952 | ||
3953 | return &acb->common; | |
3954 | } | |
3955 | ||
ea2384d3 FB |
3956 | void bdrv_init(void) |
3957 | { | |
5efa9d5a | 3958 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3959 | } |
ce1a14dc | 3960 | |
eb852011 MA |
3961 | void bdrv_init_with_whitelist(void) |
3962 | { | |
3963 | use_bdrv_whitelist = 1; | |
3964 | bdrv_init(); | |
3965 | } | |
3966 | ||
d7331bed | 3967 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 3968 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 3969 | { |
ce1a14dc PB |
3970 | BlockDriverAIOCB *acb; |
3971 | ||
d7331bed SH |
3972 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
3973 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
3974 | acb->bs = bs; |
3975 | acb->cb = cb; | |
3976 | acb->opaque = opaque; | |
3977 | return acb; | |
3978 | } | |
3979 | ||
3980 | void qemu_aio_release(void *p) | |
3981 | { | |
d37c975f | 3982 | BlockDriverAIOCB *acb = p; |
d7331bed | 3983 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 3984 | } |
19cb3738 | 3985 | |
f9f05dc5 KW |
3986 | /**************************************************************/ |
3987 | /* Coroutine block device emulation */ | |
3988 | ||
3989 | typedef struct CoroutineIOCompletion { | |
3990 | Coroutine *coroutine; | |
3991 | int ret; | |
3992 | } CoroutineIOCompletion; | |
3993 | ||
3994 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3995 | { | |
3996 | CoroutineIOCompletion *co = opaque; | |
3997 | ||
3998 | co->ret = ret; | |
3999 | qemu_coroutine_enter(co->coroutine, NULL); | |
4000 | } | |
4001 | ||
4002 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4003 | int nb_sectors, QEMUIOVector *iov, | |
4004 | bool is_write) | |
4005 | { | |
4006 | CoroutineIOCompletion co = { | |
4007 | .coroutine = qemu_coroutine_self(), | |
4008 | }; | |
4009 | BlockDriverAIOCB *acb; | |
4010 | ||
4011 | if (is_write) { | |
a652d160 SH |
4012 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4013 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4014 | } else { |
a652d160 SH |
4015 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4016 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4017 | } |
4018 | ||
59370aaa | 4019 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4020 | if (!acb) { |
4021 | return -EIO; | |
4022 | } | |
4023 | qemu_coroutine_yield(); | |
4024 | ||
4025 | return co.ret; | |
4026 | } | |
4027 | ||
4028 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4029 | int64_t sector_num, int nb_sectors, | |
4030 | QEMUIOVector *iov) | |
4031 | { | |
4032 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4033 | } | |
4034 | ||
4035 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4036 | int64_t sector_num, int nb_sectors, | |
4037 | QEMUIOVector *iov) | |
4038 | { | |
4039 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4040 | } | |
4041 | ||
07f07615 | 4042 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4043 | { |
07f07615 PB |
4044 | RwCo *rwco = opaque; |
4045 | ||
4046 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4047 | } | |
4048 | ||
4049 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4050 | { | |
eb489bb1 KW |
4051 | int ret; |
4052 | ||
29cdb251 | 4053 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4054 | return 0; |
eb489bb1 KW |
4055 | } |
4056 | ||
ca716364 | 4057 | /* Write back cached data to the OS even with cache=unsafe */ |
eb489bb1 KW |
4058 | if (bs->drv->bdrv_co_flush_to_os) { |
4059 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4060 | if (ret < 0) { | |
4061 | return ret; | |
4062 | } | |
4063 | } | |
4064 | ||
ca716364 KW |
4065 | /* But don't actually force it to the disk with cache=unsafe */ |
4066 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4067 | goto flush_parent; |
ca716364 KW |
4068 | } |
4069 | ||
eb489bb1 | 4070 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4071 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4072 | } else if (bs->drv->bdrv_aio_flush) { |
4073 | BlockDriverAIOCB *acb; | |
4074 | CoroutineIOCompletion co = { | |
4075 | .coroutine = qemu_coroutine_self(), | |
4076 | }; | |
4077 | ||
4078 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4079 | if (acb == NULL) { | |
29cdb251 | 4080 | ret = -EIO; |
07f07615 PB |
4081 | } else { |
4082 | qemu_coroutine_yield(); | |
29cdb251 | 4083 | ret = co.ret; |
07f07615 | 4084 | } |
07f07615 PB |
4085 | } else { |
4086 | /* | |
4087 | * Some block drivers always operate in either writethrough or unsafe | |
4088 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4089 | * know how the server works (because the behaviour is hardcoded or | |
4090 | * depends on server-side configuration), so we can't ensure that | |
4091 | * everything is safe on disk. Returning an error doesn't work because | |
4092 | * that would break guests even if the server operates in writethrough | |
4093 | * mode. | |
4094 | * | |
4095 | * Let's hope the user knows what he's doing. | |
4096 | */ | |
29cdb251 | 4097 | ret = 0; |
07f07615 | 4098 | } |
29cdb251 PB |
4099 | if (ret < 0) { |
4100 | return ret; | |
4101 | } | |
4102 | ||
4103 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4104 | * in the case of cache=unsafe, so there are no useless flushes. | |
4105 | */ | |
d4c82329 | 4106 | flush_parent: |
29cdb251 | 4107 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4108 | } |
4109 | ||
0f15423c AL |
4110 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4111 | { | |
4112 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4113 | bs->drv->bdrv_invalidate_cache(bs); | |
4114 | } | |
4115 | } | |
4116 | ||
4117 | void bdrv_invalidate_cache_all(void) | |
4118 | { | |
4119 | BlockDriverState *bs; | |
4120 | ||
4121 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4122 | bdrv_invalidate_cache(bs); | |
4123 | } | |
4124 | } | |
4125 | ||
07789269 BC |
4126 | void bdrv_clear_incoming_migration_all(void) |
4127 | { | |
4128 | BlockDriverState *bs; | |
4129 | ||
4130 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4131 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
4132 | } | |
4133 | } | |
4134 | ||
07f07615 PB |
4135 | int bdrv_flush(BlockDriverState *bs) |
4136 | { | |
4137 | Coroutine *co; | |
4138 | RwCo rwco = { | |
4139 | .bs = bs, | |
4140 | .ret = NOT_DONE, | |
e7a8a783 | 4141 | }; |
e7a8a783 | 4142 | |
07f07615 PB |
4143 | if (qemu_in_coroutine()) { |
4144 | /* Fast-path if already in coroutine context */ | |
4145 | bdrv_flush_co_entry(&rwco); | |
4146 | } else { | |
4147 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4148 | qemu_coroutine_enter(co, &rwco); | |
4149 | while (rwco.ret == NOT_DONE) { | |
4150 | qemu_aio_wait(); | |
4151 | } | |
e7a8a783 | 4152 | } |
07f07615 PB |
4153 | |
4154 | return rwco.ret; | |
e7a8a783 KW |
4155 | } |
4156 | ||
4265d620 PB |
4157 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4158 | { | |
4159 | RwCo *rwco = opaque; | |
4160 | ||
4161 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4162 | } | |
4163 | ||
4164 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
4165 | int nb_sectors) | |
4166 | { | |
4167 | if (!bs->drv) { | |
4168 | return -ENOMEDIUM; | |
4169 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4170 | return -EIO; | |
4171 | } else if (bs->read_only) { | |
4172 | return -EROFS; | |
df702c9b PB |
4173 | } |
4174 | ||
4175 | if (bs->dirty_bitmap) { | |
4176 | set_dirty_bitmap(bs, sector_num, nb_sectors, 0); | |
4177 | } | |
4178 | ||
4179 | if (bs->drv->bdrv_co_discard) { | |
4265d620 PB |
4180 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); |
4181 | } else if (bs->drv->bdrv_aio_discard) { | |
4182 | BlockDriverAIOCB *acb; | |
4183 | CoroutineIOCompletion co = { | |
4184 | .coroutine = qemu_coroutine_self(), | |
4185 | }; | |
4186 | ||
4187 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4188 | bdrv_co_io_em_complete, &co); | |
4189 | if (acb == NULL) { | |
4190 | return -EIO; | |
4191 | } else { | |
4192 | qemu_coroutine_yield(); | |
4193 | return co.ret; | |
4194 | } | |
4265d620 PB |
4195 | } else { |
4196 | return 0; | |
4197 | } | |
4198 | } | |
4199 | ||
4200 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4201 | { | |
4202 | Coroutine *co; | |
4203 | RwCo rwco = { | |
4204 | .bs = bs, | |
4205 | .sector_num = sector_num, | |
4206 | .nb_sectors = nb_sectors, | |
4207 | .ret = NOT_DONE, | |
4208 | }; | |
4209 | ||
4210 | if (qemu_in_coroutine()) { | |
4211 | /* Fast-path if already in coroutine context */ | |
4212 | bdrv_discard_co_entry(&rwco); | |
4213 | } else { | |
4214 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4215 | qemu_coroutine_enter(co, &rwco); | |
4216 | while (rwco.ret == NOT_DONE) { | |
4217 | qemu_aio_wait(); | |
4218 | } | |
4219 | } | |
4220 | ||
4221 | return rwco.ret; | |
4222 | } | |
4223 | ||
19cb3738 FB |
4224 | /**************************************************************/ |
4225 | /* removable device support */ | |
4226 | ||
4227 | /** | |
4228 | * Return TRUE if the media is present | |
4229 | */ | |
4230 | int bdrv_is_inserted(BlockDriverState *bs) | |
4231 | { | |
4232 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4233 | |
19cb3738 FB |
4234 | if (!drv) |
4235 | return 0; | |
4236 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4237 | return 1; |
4238 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4239 | } |
4240 | ||
4241 | /** | |
8e49ca46 MA |
4242 | * Return whether the media changed since the last call to this |
4243 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4244 | */ |
4245 | int bdrv_media_changed(BlockDriverState *bs) | |
4246 | { | |
4247 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4248 | |
8e49ca46 MA |
4249 | if (drv && drv->bdrv_media_changed) { |
4250 | return drv->bdrv_media_changed(bs); | |
4251 | } | |
4252 | return -ENOTSUP; | |
19cb3738 FB |
4253 | } |
4254 | ||
4255 | /** | |
4256 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4257 | */ | |
f36f3949 | 4258 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4259 | { |
4260 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4261 | |
822e1cd1 MA |
4262 | if (drv && drv->bdrv_eject) { |
4263 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4264 | } |
6f382ed2 LC |
4265 | |
4266 | if (bs->device_name[0] != '\0') { | |
4267 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4268 | } | |
19cb3738 FB |
4269 | } |
4270 | ||
19cb3738 FB |
4271 | /** |
4272 | * Lock or unlock the media (if it is locked, the user won't be able | |
4273 | * to eject it manually). | |
4274 | */ | |
025e849a | 4275 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4276 | { |
4277 | BlockDriver *drv = bs->drv; | |
4278 | ||
025e849a | 4279 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4280 | |
025e849a MA |
4281 | if (drv && drv->bdrv_lock_medium) { |
4282 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4283 | } |
4284 | } | |
985a03b0 TS |
4285 | |
4286 | /* needed for generic scsi interface */ | |
4287 | ||
4288 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
4289 | { | |
4290 | BlockDriver *drv = bs->drv; | |
4291 | ||
4292 | if (drv && drv->bdrv_ioctl) | |
4293 | return drv->bdrv_ioctl(bs, req, buf); | |
4294 | return -ENOTSUP; | |
4295 | } | |
7d780669 | 4296 | |
221f715d AL |
4297 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
4298 | unsigned long int req, void *buf, | |
4299 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 4300 | { |
221f715d | 4301 | BlockDriver *drv = bs->drv; |
7d780669 | 4302 | |
221f715d AL |
4303 | if (drv && drv->bdrv_aio_ioctl) |
4304 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
4305 | return NULL; | |
7d780669 | 4306 | } |
e268ca52 | 4307 | |
7b6f9300 MA |
4308 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
4309 | { | |
4310 | bs->buffer_alignment = align; | |
4311 | } | |
7cd1e32a | 4312 | |
e268ca52 AL |
4313 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
4314 | { | |
4315 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
4316 | } | |
7cd1e32a | 4317 | |
c53b1c51 SH |
4318 | /* |
4319 | * Check if all memory in this vector is sector aligned. | |
4320 | */ | |
4321 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
4322 | { | |
4323 | int i; | |
4324 | ||
4325 | for (i = 0; i < qiov->niov; i++) { | |
4326 | if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { | |
4327 | return false; | |
4328 | } | |
4329 | } | |
4330 | ||
4331 | return true; | |
4332 | } | |
4333 | ||
7cd1e32a | 4334 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
4335 | { | |
4336 | int64_t bitmap_size; | |
a55eb92c | 4337 | |
aaa0eb75 | 4338 | bs->dirty_count = 0; |
a55eb92c | 4339 | if (enable) { |
c6d22830 JK |
4340 | if (!bs->dirty_bitmap) { |
4341 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
71df14fc PB |
4342 | BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG - 1; |
4343 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG; | |
a55eb92c | 4344 | |
71df14fc | 4345 | bs->dirty_bitmap = g_new0(unsigned long, bitmap_size); |
a55eb92c | 4346 | } |
7cd1e32a | 4347 | } else { |
c6d22830 | 4348 | if (bs->dirty_bitmap) { |
7267c094 | 4349 | g_free(bs->dirty_bitmap); |
c6d22830 | 4350 | bs->dirty_bitmap = NULL; |
a55eb92c | 4351 | } |
7cd1e32a | 4352 | } |
4353 | } | |
4354 | ||
4355 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
4356 | { | |
6ea44308 | 4357 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 4358 | |
c6d22830 JK |
4359 | if (bs->dirty_bitmap && |
4360 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
1755da16 PB |
4361 | return !!(bs->dirty_bitmap[chunk / BITS_PER_LONG] & |
4362 | (1UL << (chunk % BITS_PER_LONG))); | |
7cd1e32a | 4363 | } else { |
4364 | return 0; | |
4365 | } | |
4366 | } | |
4367 | ||
1755da16 PB |
4368 | int64_t bdrv_get_next_dirty(BlockDriverState *bs, int64_t sector) |
4369 | { | |
4370 | int64_t chunk; | |
4371 | int bit, elem; | |
4372 | ||
4373 | /* Avoid an infinite loop. */ | |
4374 | assert(bs->dirty_count > 0); | |
4375 | ||
4376 | sector = (sector | (BDRV_SECTORS_PER_DIRTY_CHUNK - 1)) + 1; | |
4377 | chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; | |
4378 | ||
4379 | QEMU_BUILD_BUG_ON(sizeof(bs->dirty_bitmap[0]) * 8 != BITS_PER_LONG); | |
4380 | elem = chunk / BITS_PER_LONG; | |
4381 | bit = chunk % BITS_PER_LONG; | |
4382 | for (;;) { | |
4383 | if (sector >= bs->total_sectors) { | |
4384 | sector = 0; | |
4385 | bit = elem = 0; | |
4386 | } | |
4387 | if (bit == 0 && bs->dirty_bitmap[elem] == 0) { | |
4388 | sector += BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG; | |
4389 | elem++; | |
4390 | } else { | |
4391 | if (bs->dirty_bitmap[elem] & (1UL << bit)) { | |
4392 | return sector; | |
4393 | } | |
4394 | sector += BDRV_SECTORS_PER_DIRTY_CHUNK; | |
4395 | if (++bit == BITS_PER_LONG) { | |
4396 | bit = 0; | |
4397 | elem++; | |
4398 | } | |
4399 | } | |
4400 | } | |
4401 | } | |
4402 | ||
4403 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
4404 | int nr_sectors) | |
4405 | { | |
4406 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 1); | |
4407 | } | |
4408 | ||
a55eb92c JK |
4409 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
4410 | int nr_sectors) | |
7cd1e32a | 4411 | { |
4412 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
4413 | } | |
aaa0eb75 LS |
4414 | |
4415 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
4416 | { | |
4417 | return bs->dirty_count; | |
4418 | } | |
f88e1a42 | 4419 | |
db593f25 MT |
4420 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4421 | { | |
4422 | assert(bs->in_use != in_use); | |
4423 | bs->in_use = in_use; | |
4424 | } | |
4425 | ||
4426 | int bdrv_in_use(BlockDriverState *bs) | |
4427 | { | |
4428 | return bs->in_use; | |
4429 | } | |
4430 | ||
28a7282a LC |
4431 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4432 | { | |
d6bf279e | 4433 | bs->iostatus_enabled = true; |
58e21ef5 | 4434 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4435 | } |
4436 | ||
4437 | /* The I/O status is only enabled if the drive explicitly | |
4438 | * enables it _and_ the VM is configured to stop on errors */ | |
4439 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4440 | { | |
d6bf279e | 4441 | return (bs->iostatus_enabled && |
92aa5c6d PB |
4442 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
4443 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
4444 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
4445 | } |
4446 | ||
4447 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4448 | { | |
d6bf279e | 4449 | bs->iostatus_enabled = false; |
28a7282a LC |
4450 | } |
4451 | ||
4452 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4453 | { | |
4454 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4455 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
4456 | if (bs->job) { |
4457 | block_job_iostatus_reset(bs->job); | |
4458 | } | |
28a7282a LC |
4459 | } |
4460 | } | |
4461 | ||
28a7282a LC |
4462 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
4463 | { | |
3e1caa5f PB |
4464 | assert(bdrv_iostatus_is_enabled(bs)); |
4465 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
4466 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4467 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4468 | } |
4469 | } | |
4470 | ||
a597e79c CH |
4471 | void |
4472 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4473 | enum BlockAcctType type) | |
4474 | { | |
4475 | assert(type < BDRV_MAX_IOTYPE); | |
4476 | ||
4477 | cookie->bytes = bytes; | |
c488c7f6 | 4478 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4479 | cookie->type = type; |
4480 | } | |
4481 | ||
4482 | void | |
4483 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4484 | { | |
4485 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4486 | ||
4487 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4488 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4489 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4490 | } |
4491 | ||
d92ada22 LC |
4492 | void bdrv_img_create(const char *filename, const char *fmt, |
4493 | const char *base_filename, const char *base_fmt, | |
4494 | char *options, uint64_t img_size, int flags, Error **errp) | |
f88e1a42 JS |
4495 | { |
4496 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4497 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4498 | BlockDriverState *bs = NULL; |
4499 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4500 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4501 | int ret = 0; |
4502 | ||
4503 | /* Find driver and parse its options */ | |
4504 | drv = bdrv_find_format(fmt); | |
4505 | if (!drv) { | |
71c79813 | 4506 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4507 | return; |
f88e1a42 JS |
4508 | } |
4509 | ||
4510 | proto_drv = bdrv_find_protocol(filename); | |
4511 | if (!proto_drv) { | |
71c79813 | 4512 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 4513 | return; |
f88e1a42 JS |
4514 | } |
4515 | ||
4516 | create_options = append_option_parameters(create_options, | |
4517 | drv->create_options); | |
4518 | create_options = append_option_parameters(create_options, | |
4519 | proto_drv->create_options); | |
4520 | ||
4521 | /* Create parameter list with default values */ | |
4522 | param = parse_option_parameters("", create_options, param); | |
4523 | ||
4524 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4525 | ||
4526 | /* Parse -o options */ | |
4527 | if (options) { | |
4528 | param = parse_option_parameters(options, create_options, param); | |
4529 | if (param == NULL) { | |
71c79813 | 4530 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
4531 | goto out; |
4532 | } | |
4533 | } | |
4534 | ||
4535 | if (base_filename) { | |
4536 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4537 | base_filename)) { | |
71c79813 LC |
4538 | error_setg(errp, "Backing file not supported for file format '%s'", |
4539 | fmt); | |
f88e1a42 JS |
4540 | goto out; |
4541 | } | |
4542 | } | |
4543 | ||
4544 | if (base_fmt) { | |
4545 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
4546 | error_setg(errp, "Backing file format not supported for file " |
4547 | "format '%s'", fmt); | |
f88e1a42 JS |
4548 | goto out; |
4549 | } | |
4550 | } | |
4551 | ||
792da93a JS |
4552 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4553 | if (backing_file && backing_file->value.s) { | |
4554 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
4555 | error_setg(errp, "Error: Trying to create an image with the " |
4556 | "same filename as the backing file"); | |
792da93a JS |
4557 | goto out; |
4558 | } | |
4559 | } | |
4560 | ||
f88e1a42 JS |
4561 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4562 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4563 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4564 | if (!backing_drv) { | |
71c79813 LC |
4565 | error_setg(errp, "Unknown backing file format '%s'", |
4566 | backing_fmt->value.s); | |
f88e1a42 JS |
4567 | goto out; |
4568 | } | |
4569 | } | |
4570 | ||
4571 | // The size for the image must always be specified, with one exception: | |
4572 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4573 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4574 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4575 | if (backing_file && backing_file->value.s) { |
4576 | uint64_t size; | |
f88e1a42 | 4577 | char buf[32]; |
63090dac PB |
4578 | int back_flags; |
4579 | ||
4580 | /* backing files always opened read-only */ | |
4581 | back_flags = | |
4582 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4583 | |
f88e1a42 JS |
4584 | bs = bdrv_new(""); |
4585 | ||
63090dac | 4586 | ret = bdrv_open(bs, backing_file->value.s, back_flags, backing_drv); |
f88e1a42 | 4587 | if (ret < 0) { |
71c79813 LC |
4588 | error_setg_errno(errp, -ret, "Could not open '%s'", |
4589 | backing_file->value.s); | |
f88e1a42 JS |
4590 | goto out; |
4591 | } | |
4592 | bdrv_get_geometry(bs, &size); | |
4593 | size *= 512; | |
4594 | ||
4595 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4596 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4597 | } else { | |
71c79813 | 4598 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
4599 | goto out; |
4600 | } | |
4601 | } | |
4602 | ||
4603 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4604 | print_option_parameters(param); | |
4605 | puts(""); | |
4606 | ||
4607 | ret = bdrv_create(drv, filename, param); | |
f88e1a42 JS |
4608 | if (ret < 0) { |
4609 | if (ret == -ENOTSUP) { | |
71c79813 LC |
4610 | error_setg(errp,"Formatting or formatting option not supported for " |
4611 | "file format '%s'", fmt); | |
f88e1a42 | 4612 | } else if (ret == -EFBIG) { |
71c79813 LC |
4613 | error_setg(errp, "The image size is too large for file format '%s'", |
4614 | fmt); | |
f88e1a42 | 4615 | } else { |
71c79813 LC |
4616 | error_setg(errp, "%s: error while creating %s: %s", filename, fmt, |
4617 | strerror(-ret)); | |
f88e1a42 JS |
4618 | } |
4619 | } | |
4620 | ||
4621 | out: | |
4622 | free_option_parameters(create_options); | |
4623 | free_option_parameters(param); | |
4624 | ||
4625 | if (bs) { | |
4626 | bdrv_delete(bs); | |
4627 | } | |
f88e1a42 | 4628 | } |