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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" |
376253ec | 27 | #include "monitor.h" |
ea2384d3 | 28 | #include "block_int.h" |
5efa9d5a | 29 | #include "module.h" |
d15e5465 | 30 | #include "qemu-objects.h" |
68485420 | 31 | #include "qemu-coroutine.h" |
fc01f7e7 | 32 | |
71e72a19 | 33 | #ifdef CONFIG_BSD |
7674e7bf FB |
34 | #include <sys/types.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/ioctl.h> | |
72cf2d4f | 37 | #include <sys/queue.h> |
c5e97233 | 38 | #ifndef __DragonFly__ |
7674e7bf FB |
39 | #include <sys/disk.h> |
40 | #endif | |
c5e97233 | 41 | #endif |
7674e7bf | 42 | |
49dc768d AL |
43 | #ifdef _WIN32 |
44 | #include <windows.h> | |
45 | #endif | |
46 | ||
7d4b4ba5 | 47 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
48 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
49 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 50 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
51 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
52 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 53 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
54 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
55 | BlockDriverCompletionFunc *cb, void *opaque); | |
016f5cf6 AG |
56 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
57 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 58 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
59 | uint8_t *buf, int nb_sectors); |
60 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
61 | const uint8_t *buf, int nb_sectors); | |
68485420 KW |
62 | static BlockDriverAIOCB *bdrv_co_aio_readv_em(BlockDriverState *bs, |
63 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
64 | BlockDriverCompletionFunc *cb, void *opaque); | |
65 | static BlockDriverAIOCB *bdrv_co_aio_writev_em(BlockDriverState *bs, | |
66 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
67 | BlockDriverCompletionFunc *cb, void *opaque); | |
f9f05dc5 KW |
68 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
69 | int64_t sector_num, int nb_sectors, | |
70 | QEMUIOVector *iov); | |
71 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
72 | int64_t sector_num, int nb_sectors, | |
73 | QEMUIOVector *iov); | |
e7a8a783 | 74 | static int coroutine_fn bdrv_co_flush_em(BlockDriverState *bs); |
c5fbe571 SH |
75 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
76 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); | |
ec530c81 | 77 | |
1b7bdbc1 SH |
78 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
79 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 80 | |
8a22f02a SH |
81 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
82 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 83 | |
f9092b10 MA |
84 | /* The device to use for VM snapshots */ |
85 | static BlockDriverState *bs_snapshots; | |
86 | ||
eb852011 MA |
87 | /* If non-zero, use only whitelisted block drivers */ |
88 | static int use_bdrv_whitelist; | |
89 | ||
9e0b22f4 SH |
90 | #ifdef _WIN32 |
91 | static int is_windows_drive_prefix(const char *filename) | |
92 | { | |
93 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
94 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
95 | filename[1] == ':'); | |
96 | } | |
97 | ||
98 | int is_windows_drive(const char *filename) | |
99 | { | |
100 | if (is_windows_drive_prefix(filename) && | |
101 | filename[2] == '\0') | |
102 | return 1; | |
103 | if (strstart(filename, "\\\\.\\", NULL) || | |
104 | strstart(filename, "//./", NULL)) | |
105 | return 1; | |
106 | return 0; | |
107 | } | |
108 | #endif | |
109 | ||
110 | /* check if the path starts with "<protocol>:" */ | |
111 | static int path_has_protocol(const char *path) | |
112 | { | |
113 | #ifdef _WIN32 | |
114 | if (is_windows_drive(path) || | |
115 | is_windows_drive_prefix(path)) { | |
116 | return 0; | |
117 | } | |
118 | #endif | |
119 | ||
120 | return strchr(path, ':') != NULL; | |
121 | } | |
122 | ||
83f64091 | 123 | int path_is_absolute(const char *path) |
3b0d4f61 | 124 | { |
83f64091 | 125 | const char *p; |
21664424 FB |
126 | #ifdef _WIN32 |
127 | /* specific case for names like: "\\.\d:" */ | |
128 | if (*path == '/' || *path == '\\') | |
129 | return 1; | |
130 | #endif | |
83f64091 FB |
131 | p = strchr(path, ':'); |
132 | if (p) | |
133 | p++; | |
134 | else | |
135 | p = path; | |
3b9f94e1 FB |
136 | #ifdef _WIN32 |
137 | return (*p == '/' || *p == '\\'); | |
138 | #else | |
139 | return (*p == '/'); | |
140 | #endif | |
3b0d4f61 FB |
141 | } |
142 | ||
83f64091 FB |
143 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
144 | path to it by considering it is relative to base_path. URL are | |
145 | supported. */ | |
146 | void path_combine(char *dest, int dest_size, | |
147 | const char *base_path, | |
148 | const char *filename) | |
3b0d4f61 | 149 | { |
83f64091 FB |
150 | const char *p, *p1; |
151 | int len; | |
152 | ||
153 | if (dest_size <= 0) | |
154 | return; | |
155 | if (path_is_absolute(filename)) { | |
156 | pstrcpy(dest, dest_size, filename); | |
157 | } else { | |
158 | p = strchr(base_path, ':'); | |
159 | if (p) | |
160 | p++; | |
161 | else | |
162 | p = base_path; | |
3b9f94e1 FB |
163 | p1 = strrchr(base_path, '/'); |
164 | #ifdef _WIN32 | |
165 | { | |
166 | const char *p2; | |
167 | p2 = strrchr(base_path, '\\'); | |
168 | if (!p1 || p2 > p1) | |
169 | p1 = p2; | |
170 | } | |
171 | #endif | |
83f64091 FB |
172 | if (p1) |
173 | p1++; | |
174 | else | |
175 | p1 = base_path; | |
176 | if (p1 > p) | |
177 | p = p1; | |
178 | len = p - base_path; | |
179 | if (len > dest_size - 1) | |
180 | len = dest_size - 1; | |
181 | memcpy(dest, base_path, len); | |
182 | dest[len] = '\0'; | |
183 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 184 | } |
3b0d4f61 FB |
185 | } |
186 | ||
5efa9d5a | 187 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 188 | { |
68485420 KW |
189 | if (bdrv->bdrv_co_readv) { |
190 | /* Emulate AIO by coroutines, and sync by AIO */ | |
191 | bdrv->bdrv_aio_readv = bdrv_co_aio_readv_em; | |
192 | bdrv->bdrv_aio_writev = bdrv_co_aio_writev_em; | |
193 | bdrv->bdrv_read = bdrv_read_em; | |
194 | bdrv->bdrv_write = bdrv_write_em; | |
f9f05dc5 KW |
195 | } else { |
196 | bdrv->bdrv_co_readv = bdrv_co_readv_em; | |
197 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
198 | ||
199 | if (!bdrv->bdrv_aio_readv) { | |
200 | /* add AIO emulation layer */ | |
201 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
202 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
203 | } else if (!bdrv->bdrv_read) { | |
204 | /* add synchronous IO emulation layer */ | |
205 | bdrv->bdrv_read = bdrv_read_em; | |
206 | bdrv->bdrv_write = bdrv_write_em; | |
207 | } | |
83f64091 | 208 | } |
b2e12bc6 CH |
209 | |
210 | if (!bdrv->bdrv_aio_flush) | |
211 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
212 | ||
8a22f02a | 213 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 214 | } |
b338082b FB |
215 | |
216 | /* create a new block device (by default it is empty) */ | |
217 | BlockDriverState *bdrv_new(const char *device_name) | |
218 | { | |
1b7bdbc1 | 219 | BlockDriverState *bs; |
b338082b | 220 | |
7267c094 | 221 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 222 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 223 | if (device_name[0] != '\0') { |
1b7bdbc1 | 224 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 225 | } |
28a7282a | 226 | bdrv_iostatus_disable(bs); |
b338082b FB |
227 | return bs; |
228 | } | |
229 | ||
ea2384d3 FB |
230 | BlockDriver *bdrv_find_format(const char *format_name) |
231 | { | |
232 | BlockDriver *drv1; | |
8a22f02a SH |
233 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
234 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 235 | return drv1; |
8a22f02a | 236 | } |
ea2384d3 FB |
237 | } |
238 | return NULL; | |
239 | } | |
240 | ||
eb852011 MA |
241 | static int bdrv_is_whitelisted(BlockDriver *drv) |
242 | { | |
243 | static const char *whitelist[] = { | |
244 | CONFIG_BDRV_WHITELIST | |
245 | }; | |
246 | const char **p; | |
247 | ||
248 | if (!whitelist[0]) | |
249 | return 1; /* no whitelist, anything goes */ | |
250 | ||
251 | for (p = whitelist; *p; p++) { | |
252 | if (!strcmp(drv->format_name, *p)) { | |
253 | return 1; | |
254 | } | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
259 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
260 | { | |
261 | BlockDriver *drv = bdrv_find_format(format_name); | |
262 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
263 | } | |
264 | ||
0e7e1989 KW |
265 | int bdrv_create(BlockDriver *drv, const char* filename, |
266 | QEMUOptionParameter *options) | |
ea2384d3 FB |
267 | { |
268 | if (!drv->bdrv_create) | |
269 | return -ENOTSUP; | |
0e7e1989 KW |
270 | |
271 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
272 | } |
273 | ||
84a12e66 CH |
274 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
275 | { | |
276 | BlockDriver *drv; | |
277 | ||
b50cbabc | 278 | drv = bdrv_find_protocol(filename); |
84a12e66 | 279 | if (drv == NULL) { |
16905d71 | 280 | return -ENOENT; |
84a12e66 CH |
281 | } |
282 | ||
283 | return bdrv_create(drv, filename, options); | |
284 | } | |
285 | ||
d5249393 | 286 | #ifdef _WIN32 |
95389c86 | 287 | void get_tmp_filename(char *filename, int size) |
d5249393 | 288 | { |
3b9f94e1 | 289 | char temp_dir[MAX_PATH]; |
3b46e624 | 290 | |
3b9f94e1 FB |
291 | GetTempPath(MAX_PATH, temp_dir); |
292 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
293 | } |
294 | #else | |
95389c86 | 295 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 296 | { |
67b915a5 | 297 | int fd; |
7ccfb2eb | 298 | const char *tmpdir; |
d5249393 | 299 | /* XXX: race condition possible */ |
0badc1ee AJ |
300 | tmpdir = getenv("TMPDIR"); |
301 | if (!tmpdir) | |
302 | tmpdir = "/tmp"; | |
303 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
304 | fd = mkstemp(filename); |
305 | close(fd); | |
306 | } | |
d5249393 | 307 | #endif |
fc01f7e7 | 308 | |
84a12e66 CH |
309 | /* |
310 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
311 | * recognized as a host CDROM. | |
312 | */ | |
313 | static BlockDriver *find_hdev_driver(const char *filename) | |
314 | { | |
315 | int score_max = 0, score; | |
316 | BlockDriver *drv = NULL, *d; | |
317 | ||
318 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
319 | if (d->bdrv_probe_device) { | |
320 | score = d->bdrv_probe_device(filename); | |
321 | if (score > score_max) { | |
322 | score_max = score; | |
323 | drv = d; | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
328 | return drv; | |
329 | } | |
330 | ||
b50cbabc | 331 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
332 | { |
333 | BlockDriver *drv1; | |
334 | char protocol[128]; | |
1cec71e3 | 335 | int len; |
83f64091 | 336 | const char *p; |
19cb3738 | 337 | |
66f82cee KW |
338 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
339 | ||
39508e7a CH |
340 | /* |
341 | * XXX(hch): we really should not let host device detection | |
342 | * override an explicit protocol specification, but moving this | |
343 | * later breaks access to device names with colons in them. | |
344 | * Thanks to the brain-dead persistent naming schemes on udev- | |
345 | * based Linux systems those actually are quite common. | |
346 | */ | |
347 | drv1 = find_hdev_driver(filename); | |
348 | if (drv1) { | |
349 | return drv1; | |
350 | } | |
351 | ||
9e0b22f4 | 352 | if (!path_has_protocol(filename)) { |
39508e7a | 353 | return bdrv_find_format("file"); |
84a12e66 | 354 | } |
9e0b22f4 SH |
355 | p = strchr(filename, ':'); |
356 | assert(p != NULL); | |
1cec71e3 AL |
357 | len = p - filename; |
358 | if (len > sizeof(protocol) - 1) | |
359 | len = sizeof(protocol) - 1; | |
360 | memcpy(protocol, filename, len); | |
361 | protocol[len] = '\0'; | |
8a22f02a | 362 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 363 | if (drv1->protocol_name && |
8a22f02a | 364 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 365 | return drv1; |
8a22f02a | 366 | } |
83f64091 FB |
367 | } |
368 | return NULL; | |
369 | } | |
370 | ||
c98ac35d | 371 | static int find_image_format(const char *filename, BlockDriver **pdrv) |
f3a5d3f8 CH |
372 | { |
373 | int ret, score, score_max; | |
374 | BlockDriver *drv1, *drv; | |
375 | uint8_t buf[2048]; | |
376 | BlockDriverState *bs; | |
377 | ||
f5edb014 | 378 | ret = bdrv_file_open(&bs, filename, 0); |
c98ac35d SW |
379 | if (ret < 0) { |
380 | *pdrv = NULL; | |
381 | return ret; | |
382 | } | |
f8ea0b00 | 383 | |
08a00559 KW |
384 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
385 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
1a396859 | 386 | bdrv_delete(bs); |
c98ac35d SW |
387 | drv = bdrv_find_format("raw"); |
388 | if (!drv) { | |
389 | ret = -ENOENT; | |
390 | } | |
391 | *pdrv = drv; | |
392 | return ret; | |
1a396859 | 393 | } |
f8ea0b00 | 394 | |
83f64091 FB |
395 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
396 | bdrv_delete(bs); | |
397 | if (ret < 0) { | |
c98ac35d SW |
398 | *pdrv = NULL; |
399 | return ret; | |
83f64091 FB |
400 | } |
401 | ||
ea2384d3 | 402 | score_max = 0; |
84a12e66 | 403 | drv = NULL; |
8a22f02a | 404 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
405 | if (drv1->bdrv_probe) { |
406 | score = drv1->bdrv_probe(buf, ret, filename); | |
407 | if (score > score_max) { | |
408 | score_max = score; | |
409 | drv = drv1; | |
410 | } | |
0849bf08 | 411 | } |
fc01f7e7 | 412 | } |
c98ac35d SW |
413 | if (!drv) { |
414 | ret = -ENOENT; | |
415 | } | |
416 | *pdrv = drv; | |
417 | return ret; | |
ea2384d3 FB |
418 | } |
419 | ||
51762288 SH |
420 | /** |
421 | * Set the current 'total_sectors' value | |
422 | */ | |
423 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
424 | { | |
425 | BlockDriver *drv = bs->drv; | |
426 | ||
396759ad NB |
427 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
428 | if (bs->sg) | |
429 | return 0; | |
430 | ||
51762288 SH |
431 | /* query actual device if possible, otherwise just trust the hint */ |
432 | if (drv->bdrv_getlength) { | |
433 | int64_t length = drv->bdrv_getlength(bs); | |
434 | if (length < 0) { | |
435 | return length; | |
436 | } | |
437 | hint = length >> BDRV_SECTOR_BITS; | |
438 | } | |
439 | ||
440 | bs->total_sectors = hint; | |
441 | return 0; | |
442 | } | |
443 | ||
c3993cdc SH |
444 | /** |
445 | * Set open flags for a given cache mode | |
446 | * | |
447 | * Return 0 on success, -1 if the cache mode was invalid. | |
448 | */ | |
449 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
450 | { | |
451 | *flags &= ~BDRV_O_CACHE_MASK; | |
452 | ||
453 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
454 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
455 | } else if (!strcmp(mode, "directsync")) { |
456 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
457 | } else if (!strcmp(mode, "writeback")) { |
458 | *flags |= BDRV_O_CACHE_WB; | |
459 | } else if (!strcmp(mode, "unsafe")) { | |
460 | *flags |= BDRV_O_CACHE_WB; | |
461 | *flags |= BDRV_O_NO_FLUSH; | |
462 | } else if (!strcmp(mode, "writethrough")) { | |
463 | /* this is the default */ | |
464 | } else { | |
465 | return -1; | |
466 | } | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
57915332 KW |
471 | /* |
472 | * Common part for opening disk images and files | |
473 | */ | |
474 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
475 | int flags, BlockDriver *drv) | |
476 | { | |
477 | int ret, open_flags; | |
478 | ||
479 | assert(drv != NULL); | |
480 | ||
28dcee10 SH |
481 | trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
482 | ||
66f82cee | 483 | bs->file = NULL; |
51762288 | 484 | bs->total_sectors = 0; |
57915332 KW |
485 | bs->encrypted = 0; |
486 | bs->valid_key = 0; | |
487 | bs->open_flags = flags; | |
57915332 KW |
488 | bs->buffer_alignment = 512; |
489 | ||
490 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
491 | ||
492 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
493 | return -ENOTSUP; | |
494 | } | |
495 | ||
496 | bs->drv = drv; | |
7267c094 | 497 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 498 | |
a6599793 | 499 | if (flags & BDRV_O_CACHE_WB) |
57915332 KW |
500 | bs->enable_write_cache = 1; |
501 | ||
502 | /* | |
503 | * Clear flags that are internal to the block layer before opening the | |
504 | * image. | |
505 | */ | |
506 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
507 | ||
508 | /* | |
ebabb67a | 509 | * Snapshots should be writable. |
57915332 KW |
510 | */ |
511 | if (bs->is_temporary) { | |
512 | open_flags |= BDRV_O_RDWR; | |
513 | } | |
514 | ||
66f82cee KW |
515 | /* Open the image, either directly or using a protocol */ |
516 | if (drv->bdrv_file_open) { | |
517 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
518 | } else { | |
519 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
520 | if (ret >= 0) { | |
521 | ret = drv->bdrv_open(bs, open_flags); | |
522 | } | |
523 | } | |
524 | ||
57915332 KW |
525 | if (ret < 0) { |
526 | goto free_and_fail; | |
527 | } | |
528 | ||
529 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
51762288 SH |
530 | |
531 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
532 | if (ret < 0) { | |
533 | goto free_and_fail; | |
57915332 | 534 | } |
51762288 | 535 | |
57915332 KW |
536 | #ifndef _WIN32 |
537 | if (bs->is_temporary) { | |
538 | unlink(filename); | |
539 | } | |
540 | #endif | |
541 | return 0; | |
542 | ||
543 | free_and_fail: | |
66f82cee KW |
544 | if (bs->file) { |
545 | bdrv_delete(bs->file); | |
546 | bs->file = NULL; | |
547 | } | |
7267c094 | 548 | g_free(bs->opaque); |
57915332 KW |
549 | bs->opaque = NULL; |
550 | bs->drv = NULL; | |
551 | return ret; | |
552 | } | |
553 | ||
b6ce07aa KW |
554 | /* |
555 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
556 | */ | |
83f64091 | 557 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 558 | { |
83f64091 | 559 | BlockDriverState *bs; |
6db95603 | 560 | BlockDriver *drv; |
83f64091 FB |
561 | int ret; |
562 | ||
b50cbabc | 563 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
564 | if (!drv) { |
565 | return -ENOENT; | |
566 | } | |
567 | ||
83f64091 | 568 | bs = bdrv_new(""); |
b6ce07aa | 569 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
570 | if (ret < 0) { |
571 | bdrv_delete(bs); | |
572 | return ret; | |
3b0d4f61 | 573 | } |
71d0770c | 574 | bs->growable = 1; |
83f64091 FB |
575 | *pbs = bs; |
576 | return 0; | |
577 | } | |
578 | ||
b6ce07aa KW |
579 | /* |
580 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
581 | */ | |
d6e9098e KW |
582 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
583 | BlockDriver *drv) | |
ea2384d3 | 584 | { |
b6ce07aa | 585 | int ret; |
712e7874 | 586 | |
83f64091 | 587 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
588 | BlockDriverState *bs1; |
589 | int64_t total_size; | |
7c96d46e | 590 | int is_protocol = 0; |
91a073a9 KW |
591 | BlockDriver *bdrv_qcow2; |
592 | QEMUOptionParameter *options; | |
b6ce07aa KW |
593 | char tmp_filename[PATH_MAX]; |
594 | char backing_filename[PATH_MAX]; | |
3b46e624 | 595 | |
ea2384d3 FB |
596 | /* if snapshot, we create a temporary backing file and open it |
597 | instead of opening 'filename' directly */ | |
33e3963e | 598 | |
ea2384d3 FB |
599 | /* if there is a backing file, use it */ |
600 | bs1 = bdrv_new(""); | |
d6e9098e | 601 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 602 | if (ret < 0) { |
ea2384d3 | 603 | bdrv_delete(bs1); |
51d7c00c | 604 | return ret; |
ea2384d3 | 605 | } |
3e82990b | 606 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
607 | |
608 | if (bs1->drv && bs1->drv->protocol_name) | |
609 | is_protocol = 1; | |
610 | ||
ea2384d3 | 611 | bdrv_delete(bs1); |
3b46e624 | 612 | |
ea2384d3 | 613 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
614 | |
615 | /* Real path is meaningless for protocols */ | |
616 | if (is_protocol) | |
617 | snprintf(backing_filename, sizeof(backing_filename), | |
618 | "%s", filename); | |
114cdfa9 KS |
619 | else if (!realpath(filename, backing_filename)) |
620 | return -errno; | |
7c96d46e | 621 | |
91a073a9 KW |
622 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
623 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
624 | ||
3e82990b | 625 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
626 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
627 | if (drv) { | |
628 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
629 | drv->format_name); | |
630 | } | |
631 | ||
632 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 633 | free_option_parameters(options); |
51d7c00c AL |
634 | if (ret < 0) { |
635 | return ret; | |
ea2384d3 | 636 | } |
91a073a9 | 637 | |
ea2384d3 | 638 | filename = tmp_filename; |
91a073a9 | 639 | drv = bdrv_qcow2; |
ea2384d3 FB |
640 | bs->is_temporary = 1; |
641 | } | |
712e7874 | 642 | |
b6ce07aa | 643 | /* Find the right image format driver */ |
6db95603 | 644 | if (!drv) { |
c98ac35d | 645 | ret = find_image_format(filename, &drv); |
51d7c00c | 646 | } |
6987307c | 647 | |
51d7c00c | 648 | if (!drv) { |
51d7c00c | 649 | goto unlink_and_fail; |
ea2384d3 | 650 | } |
b6ce07aa KW |
651 | |
652 | /* Open the image */ | |
653 | ret = bdrv_open_common(bs, filename, flags, drv); | |
654 | if (ret < 0) { | |
6987307c CH |
655 | goto unlink_and_fail; |
656 | } | |
657 | ||
b6ce07aa KW |
658 | /* If there is a backing file, use it */ |
659 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
660 | char backing_filename[PATH_MAX]; | |
661 | int back_flags; | |
662 | BlockDriver *back_drv = NULL; | |
663 | ||
664 | bs->backing_hd = bdrv_new(""); | |
df2dbb4a SH |
665 | |
666 | if (path_has_protocol(bs->backing_file)) { | |
667 | pstrcpy(backing_filename, sizeof(backing_filename), | |
668 | bs->backing_file); | |
669 | } else { | |
670 | path_combine(backing_filename, sizeof(backing_filename), | |
671 | filename, bs->backing_file); | |
672 | } | |
673 | ||
674 | if (bs->backing_format[0] != '\0') { | |
b6ce07aa | 675 | back_drv = bdrv_find_format(bs->backing_format); |
df2dbb4a | 676 | } |
b6ce07aa KW |
677 | |
678 | /* backing files always opened read-only */ | |
679 | back_flags = | |
680 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
681 | ||
682 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
683 | if (ret < 0) { | |
684 | bdrv_close(bs); | |
685 | return ret; | |
686 | } | |
687 | if (bs->is_temporary) { | |
688 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
689 | } else { | |
690 | /* base image inherits from "parent" */ | |
691 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
692 | } | |
693 | } | |
694 | ||
695 | if (!bdrv_key_required(bs)) { | |
7d4b4ba5 | 696 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
697 | } |
698 | ||
699 | return 0; | |
700 | ||
701 | unlink_and_fail: | |
702 | if (bs->is_temporary) { | |
703 | unlink(filename); | |
704 | } | |
705 | return ret; | |
706 | } | |
707 | ||
fc01f7e7 FB |
708 | void bdrv_close(BlockDriverState *bs) |
709 | { | |
19cb3738 | 710 | if (bs->drv) { |
f9092b10 MA |
711 | if (bs == bs_snapshots) { |
712 | bs_snapshots = NULL; | |
713 | } | |
557df6ac | 714 | if (bs->backing_hd) { |
ea2384d3 | 715 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
716 | bs->backing_hd = NULL; |
717 | } | |
ea2384d3 | 718 | bs->drv->bdrv_close(bs); |
7267c094 | 719 | g_free(bs->opaque); |
ea2384d3 FB |
720 | #ifdef _WIN32 |
721 | if (bs->is_temporary) { | |
722 | unlink(bs->filename); | |
723 | } | |
67b915a5 | 724 | #endif |
ea2384d3 FB |
725 | bs->opaque = NULL; |
726 | bs->drv = NULL; | |
b338082b | 727 | |
66f82cee KW |
728 | if (bs->file != NULL) { |
729 | bdrv_close(bs->file); | |
730 | } | |
731 | ||
7d4b4ba5 | 732 | bdrv_dev_change_media_cb(bs, false); |
b338082b FB |
733 | } |
734 | } | |
735 | ||
2bc93fed MK |
736 | void bdrv_close_all(void) |
737 | { | |
738 | BlockDriverState *bs; | |
739 | ||
740 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
741 | bdrv_close(bs); | |
742 | } | |
743 | } | |
744 | ||
d22b2f41 RH |
745 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
746 | Also, NULL terminate the device_name to prevent double remove */ | |
747 | void bdrv_make_anon(BlockDriverState *bs) | |
748 | { | |
749 | if (bs->device_name[0] != '\0') { | |
750 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
751 | } | |
752 | bs->device_name[0] = '\0'; | |
753 | } | |
754 | ||
b338082b FB |
755 | void bdrv_delete(BlockDriverState *bs) |
756 | { | |
fa879d62 | 757 | assert(!bs->dev); |
18846dee | 758 | |
1b7bdbc1 | 759 | /* remove from list, if necessary */ |
d22b2f41 | 760 | bdrv_make_anon(bs); |
34c6f050 | 761 | |
b338082b | 762 | bdrv_close(bs); |
66f82cee KW |
763 | if (bs->file != NULL) { |
764 | bdrv_delete(bs->file); | |
765 | } | |
766 | ||
f9092b10 | 767 | assert(bs != bs_snapshots); |
7267c094 | 768 | g_free(bs); |
fc01f7e7 FB |
769 | } |
770 | ||
fa879d62 MA |
771 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
772 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 773 | { |
fa879d62 | 774 | if (bs->dev) { |
18846dee MA |
775 | return -EBUSY; |
776 | } | |
fa879d62 | 777 | bs->dev = dev; |
28a7282a | 778 | bdrv_iostatus_reset(bs); |
18846dee MA |
779 | return 0; |
780 | } | |
781 | ||
fa879d62 MA |
782 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
783 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 784 | { |
fa879d62 MA |
785 | if (bdrv_attach_dev(bs, dev) < 0) { |
786 | abort(); | |
787 | } | |
788 | } | |
789 | ||
790 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
791 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
792 | { | |
793 | assert(bs->dev == dev); | |
794 | bs->dev = NULL; | |
0e49de52 MA |
795 | bs->dev_ops = NULL; |
796 | bs->dev_opaque = NULL; | |
29e05f20 | 797 | bs->buffer_alignment = 512; |
18846dee MA |
798 | } |
799 | ||
fa879d62 MA |
800 | /* TODO change to return DeviceState * when all users are qdevified */ |
801 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 802 | { |
fa879d62 | 803 | return bs->dev; |
18846dee MA |
804 | } |
805 | ||
0e49de52 MA |
806 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
807 | void *opaque) | |
808 | { | |
809 | bs->dev_ops = ops; | |
810 | bs->dev_opaque = opaque; | |
2c6942fa MA |
811 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
812 | bs_snapshots = NULL; | |
813 | } | |
0e49de52 MA |
814 | } |
815 | ||
7d4b4ba5 | 816 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 817 | { |
145feb17 | 818 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
7d4b4ba5 | 819 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
145feb17 MA |
820 | } |
821 | } | |
822 | ||
2c6942fa MA |
823 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
824 | { | |
825 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
826 | } | |
827 | ||
e4def80b MA |
828 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
829 | { | |
830 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
831 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
832 | } | |
833 | return false; | |
834 | } | |
835 | ||
145feb17 MA |
836 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
837 | { | |
838 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
839 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
840 | } |
841 | } | |
842 | ||
f107639a MA |
843 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
844 | { | |
845 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
846 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
847 | } | |
848 | return false; | |
849 | } | |
850 | ||
e97fc193 AL |
851 | /* |
852 | * Run consistency checks on an image | |
853 | * | |
e076f338 | 854 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 855 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 856 | * check are stored in res. |
e97fc193 | 857 | */ |
e076f338 | 858 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) |
e97fc193 AL |
859 | { |
860 | if (bs->drv->bdrv_check == NULL) { | |
861 | return -ENOTSUP; | |
862 | } | |
863 | ||
e076f338 | 864 | memset(res, 0, sizeof(*res)); |
9ac228e0 | 865 | return bs->drv->bdrv_check(bs, res); |
e97fc193 AL |
866 | } |
867 | ||
8a426614 KW |
868 | #define COMMIT_BUF_SECTORS 2048 |
869 | ||
33e3963e FB |
870 | /* commit COW file into the raw image */ |
871 | int bdrv_commit(BlockDriverState *bs) | |
872 | { | |
19cb3738 | 873 | BlockDriver *drv = bs->drv; |
ee181196 | 874 | BlockDriver *backing_drv; |
8a426614 KW |
875 | int64_t sector, total_sectors; |
876 | int n, ro, open_flags; | |
4dca4b63 | 877 | int ret = 0, rw_ret = 0; |
8a426614 | 878 | uint8_t *buf; |
4dca4b63 NS |
879 | char filename[1024]; |
880 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 881 | |
19cb3738 FB |
882 | if (!drv) |
883 | return -ENOMEDIUM; | |
4dca4b63 NS |
884 | |
885 | if (!bs->backing_hd) { | |
886 | return -ENOTSUP; | |
33e3963e FB |
887 | } |
888 | ||
4dca4b63 NS |
889 | if (bs->backing_hd->keep_read_only) { |
890 | return -EACCES; | |
891 | } | |
ee181196 KW |
892 | |
893 | backing_drv = bs->backing_hd->drv; | |
4dca4b63 NS |
894 | ro = bs->backing_hd->read_only; |
895 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
896 | open_flags = bs->backing_hd->open_flags; | |
897 | ||
898 | if (ro) { | |
899 | /* re-open as RW */ | |
900 | bdrv_delete(bs->backing_hd); | |
901 | bs->backing_hd = NULL; | |
902 | bs_rw = bdrv_new(""); | |
ee181196 KW |
903 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
904 | backing_drv); | |
4dca4b63 NS |
905 | if (rw_ret < 0) { |
906 | bdrv_delete(bs_rw); | |
907 | /* try to re-open read-only */ | |
908 | bs_ro = bdrv_new(""); | |
ee181196 KW |
909 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
910 | backing_drv); | |
4dca4b63 NS |
911 | if (ret < 0) { |
912 | bdrv_delete(bs_ro); | |
913 | /* drive not functional anymore */ | |
914 | bs->drv = NULL; | |
915 | return ret; | |
916 | } | |
917 | bs->backing_hd = bs_ro; | |
918 | return rw_ret; | |
919 | } | |
920 | bs->backing_hd = bs_rw; | |
ea2384d3 | 921 | } |
33e3963e | 922 | |
6ea44308 | 923 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 924 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
925 | |
926 | for (sector = 0; sector < total_sectors; sector += n) { | |
927 | if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { | |
928 | ||
929 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
930 | ret = -EIO; | |
931 | goto ro_cleanup; | |
932 | } | |
933 | ||
934 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
935 | ret = -EIO; | |
936 | goto ro_cleanup; | |
937 | } | |
ea2384d3 | 938 | } |
33e3963e | 939 | } |
95389c86 | 940 | |
1d44952f CH |
941 | if (drv->bdrv_make_empty) { |
942 | ret = drv->bdrv_make_empty(bs); | |
943 | bdrv_flush(bs); | |
944 | } | |
95389c86 | 945 | |
3f5075ae CH |
946 | /* |
947 | * Make sure all data we wrote to the backing device is actually | |
948 | * stable on disk. | |
949 | */ | |
950 | if (bs->backing_hd) | |
951 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
952 | |
953 | ro_cleanup: | |
7267c094 | 954 | g_free(buf); |
4dca4b63 NS |
955 | |
956 | if (ro) { | |
957 | /* re-open as RO */ | |
958 | bdrv_delete(bs->backing_hd); | |
959 | bs->backing_hd = NULL; | |
960 | bs_ro = bdrv_new(""); | |
ee181196 KW |
961 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
962 | backing_drv); | |
4dca4b63 NS |
963 | if (ret < 0) { |
964 | bdrv_delete(bs_ro); | |
965 | /* drive not functional anymore */ | |
966 | bs->drv = NULL; | |
967 | return ret; | |
968 | } | |
969 | bs->backing_hd = bs_ro; | |
970 | bs->backing_hd->keep_read_only = 0; | |
971 | } | |
972 | ||
1d44952f | 973 | return ret; |
33e3963e FB |
974 | } |
975 | ||
6ab4b5ab MA |
976 | void bdrv_commit_all(void) |
977 | { | |
978 | BlockDriverState *bs; | |
979 | ||
980 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
981 | bdrv_commit(bs); | |
982 | } | |
983 | } | |
984 | ||
756e6736 KW |
985 | /* |
986 | * Return values: | |
987 | * 0 - success | |
988 | * -EINVAL - backing format specified, but no file | |
989 | * -ENOSPC - can't update the backing file because no space is left in the | |
990 | * image file header | |
991 | * -ENOTSUP - format driver doesn't support changing the backing file | |
992 | */ | |
993 | int bdrv_change_backing_file(BlockDriverState *bs, | |
994 | const char *backing_file, const char *backing_fmt) | |
995 | { | |
996 | BlockDriver *drv = bs->drv; | |
997 | ||
998 | if (drv->bdrv_change_backing_file != NULL) { | |
999 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
1000 | } else { | |
1001 | return -ENOTSUP; | |
1002 | } | |
1003 | } | |
1004 | ||
71d0770c AL |
1005 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1006 | size_t size) | |
1007 | { | |
1008 | int64_t len; | |
1009 | ||
1010 | if (!bdrv_is_inserted(bs)) | |
1011 | return -ENOMEDIUM; | |
1012 | ||
1013 | if (bs->growable) | |
1014 | return 0; | |
1015 | ||
1016 | len = bdrv_getlength(bs); | |
1017 | ||
fbb7b4e0 KW |
1018 | if (offset < 0) |
1019 | return -EIO; | |
1020 | ||
1021 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
1022 | return -EIO; |
1023 | ||
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
1028 | int nb_sectors) | |
1029 | { | |
eb5a3165 JS |
1030 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
1031 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
1032 | } |
1033 | ||
e7a8a783 KW |
1034 | static inline bool bdrv_has_async_rw(BlockDriver *drv) |
1035 | { | |
1036 | return drv->bdrv_co_readv != bdrv_co_readv_em | |
1037 | || drv->bdrv_aio_readv != bdrv_aio_readv_em; | |
1038 | } | |
1039 | ||
1040 | static inline bool bdrv_has_async_flush(BlockDriver *drv) | |
1041 | { | |
1042 | return drv->bdrv_aio_flush != bdrv_aio_flush_em; | |
1043 | } | |
1044 | ||
19cb3738 | 1045 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 1046 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
1047 | uint8_t *buf, int nb_sectors) |
1048 | { | |
ea2384d3 FB |
1049 | BlockDriver *drv = bs->drv; |
1050 | ||
19cb3738 FB |
1051 | if (!drv) |
1052 | return -ENOMEDIUM; | |
e7a8a783 KW |
1053 | |
1054 | if (bdrv_has_async_rw(drv) && qemu_in_coroutine()) { | |
1055 | QEMUIOVector qiov; | |
1056 | struct iovec iov = { | |
1057 | .iov_base = (void *)buf, | |
1058 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1059 | }; | |
1060 | ||
1061 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1062 | return bdrv_co_readv(bs, sector_num, nb_sectors, &qiov); | |
1063 | } | |
1064 | ||
71d0770c AL |
1065 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1066 | return -EIO; | |
b338082b | 1067 | |
eda578e5 | 1068 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
1069 | } |
1070 | ||
7cd1e32a | 1071 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 1072 | int nb_sectors, int dirty) |
7cd1e32a | 1073 | { |
1074 | int64_t start, end; | |
c6d22830 | 1075 | unsigned long val, idx, bit; |
a55eb92c | 1076 | |
6ea44308 | 1077 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 1078 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
1079 | |
1080 | for (; start <= end; start++) { | |
c6d22830 JK |
1081 | idx = start / (sizeof(unsigned long) * 8); |
1082 | bit = start % (sizeof(unsigned long) * 8); | |
1083 | val = bs->dirty_bitmap[idx]; | |
1084 | if (dirty) { | |
6d59fec1 | 1085 | if (!(val & (1UL << bit))) { |
aaa0eb75 | 1086 | bs->dirty_count++; |
6d59fec1 | 1087 | val |= 1UL << bit; |
aaa0eb75 | 1088 | } |
c6d22830 | 1089 | } else { |
6d59fec1 | 1090 | if (val & (1UL << bit)) { |
aaa0eb75 | 1091 | bs->dirty_count--; |
6d59fec1 | 1092 | val &= ~(1UL << bit); |
aaa0eb75 | 1093 | } |
c6d22830 JK |
1094 | } |
1095 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 1096 | } |
1097 | } | |
1098 | ||
5fafdf24 | 1099 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
1100 | -EIO generic I/O error (may happen for all errors) |
1101 | -ENOMEDIUM No media inserted. | |
1102 | -EINVAL Invalid sector number or nb_sectors | |
1103 | -EACCES Trying to write a read-only device | |
1104 | */ | |
5fafdf24 | 1105 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
1106 | const uint8_t *buf, int nb_sectors) |
1107 | { | |
83f64091 | 1108 | BlockDriver *drv = bs->drv; |
e7a8a783 | 1109 | |
19cb3738 FB |
1110 | if (!bs->drv) |
1111 | return -ENOMEDIUM; | |
e7a8a783 KW |
1112 | |
1113 | if (bdrv_has_async_rw(drv) && qemu_in_coroutine()) { | |
1114 | QEMUIOVector qiov; | |
1115 | struct iovec iov = { | |
1116 | .iov_base = (void *)buf, | |
1117 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1118 | }; | |
1119 | ||
1120 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1121 | return bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
1122 | } | |
1123 | ||
0849bf08 | 1124 | if (bs->read_only) |
19cb3738 | 1125 | return -EACCES; |
71d0770c AL |
1126 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1127 | return -EIO; | |
a55eb92c | 1128 | |
c6d22830 | 1129 | if (bs->dirty_bitmap) { |
7cd1e32a | 1130 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1131 | } | |
a55eb92c | 1132 | |
294cc35f KW |
1133 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
1134 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1135 | } | |
1136 | ||
42fb2807 | 1137 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
1138 | } |
1139 | ||
eda578e5 AL |
1140 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
1141 | void *buf, int count1) | |
83f64091 | 1142 | { |
6ea44308 | 1143 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1144 | int len, nb_sectors, count; |
1145 | int64_t sector_num; | |
9a8c4cce | 1146 | int ret; |
83f64091 FB |
1147 | |
1148 | count = count1; | |
1149 | /* first read to align to sector start */ | |
6ea44308 | 1150 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1151 | if (len > count) |
1152 | len = count; | |
6ea44308 | 1153 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1154 | if (len > 0) { |
9a8c4cce KW |
1155 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1156 | return ret; | |
6ea44308 | 1157 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
1158 | count -= len; |
1159 | if (count == 0) | |
1160 | return count1; | |
1161 | sector_num++; | |
1162 | buf += len; | |
1163 | } | |
1164 | ||
1165 | /* read the sectors "in place" */ | |
6ea44308 | 1166 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1167 | if (nb_sectors > 0) { |
9a8c4cce KW |
1168 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1169 | return ret; | |
83f64091 | 1170 | sector_num += nb_sectors; |
6ea44308 | 1171 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1172 | buf += len; |
1173 | count -= len; | |
1174 | } | |
1175 | ||
1176 | /* add data from the last sector */ | |
1177 | if (count > 0) { | |
9a8c4cce KW |
1178 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1179 | return ret; | |
83f64091 FB |
1180 | memcpy(buf, tmp_buf, count); |
1181 | } | |
1182 | return count1; | |
1183 | } | |
1184 | ||
eda578e5 AL |
1185 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
1186 | const void *buf, int count1) | |
83f64091 | 1187 | { |
6ea44308 | 1188 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1189 | int len, nb_sectors, count; |
1190 | int64_t sector_num; | |
9a8c4cce | 1191 | int ret; |
83f64091 FB |
1192 | |
1193 | count = count1; | |
1194 | /* first write to align to sector start */ | |
6ea44308 | 1195 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1196 | if (len > count) |
1197 | len = count; | |
6ea44308 | 1198 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1199 | if (len > 0) { |
9a8c4cce KW |
1200 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1201 | return ret; | |
6ea44308 | 1202 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1203 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1204 | return ret; | |
83f64091 FB |
1205 | count -= len; |
1206 | if (count == 0) | |
1207 | return count1; | |
1208 | sector_num++; | |
1209 | buf += len; | |
1210 | } | |
1211 | ||
1212 | /* write the sectors "in place" */ | |
6ea44308 | 1213 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1214 | if (nb_sectors > 0) { |
9a8c4cce KW |
1215 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1216 | return ret; | |
83f64091 | 1217 | sector_num += nb_sectors; |
6ea44308 | 1218 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1219 | buf += len; |
1220 | count -= len; | |
1221 | } | |
1222 | ||
1223 | /* add data from the last sector */ | |
1224 | if (count > 0) { | |
9a8c4cce KW |
1225 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1226 | return ret; | |
83f64091 | 1227 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1228 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1229 | return ret; | |
83f64091 FB |
1230 | } |
1231 | return count1; | |
1232 | } | |
83f64091 | 1233 | |
f08145fe KW |
1234 | /* |
1235 | * Writes to the file and ensures that no writes are reordered across this | |
1236 | * request (acts as a barrier) | |
1237 | * | |
1238 | * Returns 0 on success, -errno in error cases. | |
1239 | */ | |
1240 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1241 | const void *buf, int count) | |
1242 | { | |
1243 | int ret; | |
1244 | ||
1245 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1246 | if (ret < 0) { | |
1247 | return ret; | |
1248 | } | |
1249 | ||
92196b2f SH |
1250 | /* No flush needed for cache modes that use O_DSYNC */ |
1251 | if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { | |
f08145fe KW |
1252 | bdrv_flush(bs); |
1253 | } | |
1254 | ||
1255 | return 0; | |
1256 | } | |
1257 | ||
c5fbe571 SH |
1258 | /* |
1259 | * Handle a read request in coroutine context | |
1260 | */ | |
1261 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
1262 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
da1fa91d KW |
1263 | { |
1264 | BlockDriver *drv = bs->drv; | |
1265 | ||
da1fa91d KW |
1266 | if (!drv) { |
1267 | return -ENOMEDIUM; | |
1268 | } | |
1269 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1270 | return -EIO; | |
1271 | } | |
1272 | ||
1273 | return drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
1274 | } | |
1275 | ||
c5fbe571 | 1276 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
1277 | int nb_sectors, QEMUIOVector *qiov) |
1278 | { | |
c5fbe571 | 1279 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 1280 | |
c5fbe571 SH |
1281 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov); |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * Handle a write request in coroutine context | |
1286 | */ | |
1287 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
1288 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1289 | { | |
1290 | BlockDriver *drv = bs->drv; | |
da1fa91d KW |
1291 | |
1292 | if (!bs->drv) { | |
1293 | return -ENOMEDIUM; | |
1294 | } | |
1295 | if (bs->read_only) { | |
1296 | return -EACCES; | |
1297 | } | |
1298 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1299 | return -EIO; | |
1300 | } | |
1301 | ||
1302 | if (bs->dirty_bitmap) { | |
1303 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1304 | } | |
1305 | ||
1306 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1307 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1308 | } | |
1309 | ||
1310 | return drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
1311 | } | |
1312 | ||
c5fbe571 SH |
1313 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
1314 | int nb_sectors, QEMUIOVector *qiov) | |
1315 | { | |
1316 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
1317 | ||
1318 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov); | |
1319 | } | |
1320 | ||
83f64091 FB |
1321 | /** |
1322 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1323 | */ | |
1324 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1325 | { | |
1326 | BlockDriver *drv = bs->drv; | |
51762288 | 1327 | int ret; |
83f64091 | 1328 | if (!drv) |
19cb3738 | 1329 | return -ENOMEDIUM; |
83f64091 FB |
1330 | if (!drv->bdrv_truncate) |
1331 | return -ENOTSUP; | |
59f2689d NS |
1332 | if (bs->read_only) |
1333 | return -EACCES; | |
8591675f MT |
1334 | if (bdrv_in_use(bs)) |
1335 | return -EBUSY; | |
51762288 SH |
1336 | ret = drv->bdrv_truncate(bs, offset); |
1337 | if (ret == 0) { | |
1338 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 1339 | bdrv_dev_resize_cb(bs); |
51762288 SH |
1340 | } |
1341 | return ret; | |
83f64091 FB |
1342 | } |
1343 | ||
4a1d5e1f FZ |
1344 | /** |
1345 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
1346 | * allocated space. Return < 0 if error or unknown. | |
1347 | */ | |
1348 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
1349 | { | |
1350 | BlockDriver *drv = bs->drv; | |
1351 | if (!drv) { | |
1352 | return -ENOMEDIUM; | |
1353 | } | |
1354 | if (drv->bdrv_get_allocated_file_size) { | |
1355 | return drv->bdrv_get_allocated_file_size(bs); | |
1356 | } | |
1357 | if (bs->file) { | |
1358 | return bdrv_get_allocated_file_size(bs->file); | |
1359 | } | |
1360 | return -ENOTSUP; | |
1361 | } | |
1362 | ||
83f64091 FB |
1363 | /** |
1364 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1365 | */ | |
1366 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1367 | { | |
1368 | BlockDriver *drv = bs->drv; | |
1369 | if (!drv) | |
19cb3738 | 1370 | return -ENOMEDIUM; |
51762288 | 1371 | |
2c6942fa | 1372 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
1373 | if (drv->bdrv_getlength) { |
1374 | return drv->bdrv_getlength(bs); | |
1375 | } | |
83f64091 | 1376 | } |
46a4e4e6 | 1377 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
1378 | } |
1379 | ||
19cb3738 | 1380 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 1381 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 1382 | { |
19cb3738 FB |
1383 | int64_t length; |
1384 | length = bdrv_getlength(bs); | |
1385 | if (length < 0) | |
1386 | length = 0; | |
1387 | else | |
6ea44308 | 1388 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 1389 | *nb_sectors_ptr = length; |
fc01f7e7 | 1390 | } |
cf98951b | 1391 | |
f3d54fc4 AL |
1392 | struct partition { |
1393 | uint8_t boot_ind; /* 0x80 - active */ | |
1394 | uint8_t head; /* starting head */ | |
1395 | uint8_t sector; /* starting sector */ | |
1396 | uint8_t cyl; /* starting cylinder */ | |
1397 | uint8_t sys_ind; /* What partition type */ | |
1398 | uint8_t end_head; /* end head */ | |
1399 | uint8_t end_sector; /* end sector */ | |
1400 | uint8_t end_cyl; /* end cylinder */ | |
1401 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1402 | uint32_t nr_sects; /* nr of sectors in partition */ | |
541dc0d4 | 1403 | } QEMU_PACKED; |
f3d54fc4 AL |
1404 | |
1405 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1406 | static int guess_disk_lchs(BlockDriverState *bs, | |
1407 | int *pcylinders, int *pheads, int *psectors) | |
1408 | { | |
eb5a3165 | 1409 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
1410 | int ret, i, heads, sectors, cylinders; |
1411 | struct partition *p; | |
1412 | uint32_t nr_sects; | |
a38131b6 | 1413 | uint64_t nb_sectors; |
f3d54fc4 AL |
1414 | |
1415 | bdrv_get_geometry(bs, &nb_sectors); | |
1416 | ||
1417 | ret = bdrv_read(bs, 0, buf, 1); | |
1418 | if (ret < 0) | |
1419 | return -1; | |
1420 | /* test msdos magic */ | |
1421 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1422 | return -1; | |
1423 | for(i = 0; i < 4; i++) { | |
1424 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1425 | nr_sects = le32_to_cpu(p->nr_sects); | |
1426 | if (nr_sects && p->end_head) { | |
1427 | /* We make the assumption that the partition terminates on | |
1428 | a cylinder boundary */ | |
1429 | heads = p->end_head + 1; | |
1430 | sectors = p->end_sector & 63; | |
1431 | if (sectors == 0) | |
1432 | continue; | |
1433 | cylinders = nb_sectors / (heads * sectors); | |
1434 | if (cylinders < 1 || cylinders > 16383) | |
1435 | continue; | |
1436 | *pheads = heads; | |
1437 | *psectors = sectors; | |
1438 | *pcylinders = cylinders; | |
1439 | #if 0 | |
1440 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1441 | cylinders, heads, sectors); | |
1442 | #endif | |
1443 | return 0; | |
1444 | } | |
1445 | } | |
1446 | return -1; | |
1447 | } | |
1448 | ||
1449 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1450 | { | |
1451 | int translation, lba_detected = 0; | |
1452 | int cylinders, heads, secs; | |
a38131b6 | 1453 | uint64_t nb_sectors; |
f3d54fc4 AL |
1454 | |
1455 | /* if a geometry hint is available, use it */ | |
1456 | bdrv_get_geometry(bs, &nb_sectors); | |
1457 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1458 | translation = bdrv_get_translation_hint(bs); | |
1459 | if (cylinders != 0) { | |
1460 | *pcyls = cylinders; | |
1461 | *pheads = heads; | |
1462 | *psecs = secs; | |
1463 | } else { | |
1464 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1465 | if (heads > 16) { | |
1466 | /* if heads > 16, it means that a BIOS LBA | |
1467 | translation was active, so the default | |
1468 | hardware geometry is OK */ | |
1469 | lba_detected = 1; | |
1470 | goto default_geometry; | |
1471 | } else { | |
1472 | *pcyls = cylinders; | |
1473 | *pheads = heads; | |
1474 | *psecs = secs; | |
1475 | /* disable any translation to be in sync with | |
1476 | the logical geometry */ | |
1477 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1478 | bdrv_set_translation_hint(bs, | |
1479 | BIOS_ATA_TRANSLATION_NONE); | |
1480 | } | |
1481 | } | |
1482 | } else { | |
1483 | default_geometry: | |
1484 | /* if no geometry, use a standard physical disk geometry */ | |
1485 | cylinders = nb_sectors / (16 * 63); | |
1486 | ||
1487 | if (cylinders > 16383) | |
1488 | cylinders = 16383; | |
1489 | else if (cylinders < 2) | |
1490 | cylinders = 2; | |
1491 | *pcyls = cylinders; | |
1492 | *pheads = 16; | |
1493 | *psecs = 63; | |
1494 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1495 | if ((*pcyls * *pheads) <= 131072) { | |
1496 | bdrv_set_translation_hint(bs, | |
1497 | BIOS_ATA_TRANSLATION_LARGE); | |
1498 | } else { | |
1499 | bdrv_set_translation_hint(bs, | |
1500 | BIOS_ATA_TRANSLATION_LBA); | |
1501 | } | |
1502 | } | |
1503 | } | |
1504 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1505 | } | |
1506 | } | |
1507 | ||
5fafdf24 | 1508 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1509 | int cyls, int heads, int secs) |
1510 | { | |
1511 | bs->cyls = cyls; | |
1512 | bs->heads = heads; | |
1513 | bs->secs = secs; | |
1514 | } | |
1515 | ||
46d4767d FB |
1516 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1517 | { | |
1518 | bs->translation = translation; | |
1519 | } | |
1520 | ||
5fafdf24 | 1521 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1522 | int *pcyls, int *pheads, int *psecs) |
1523 | { | |
1524 | *pcyls = bs->cyls; | |
1525 | *pheads = bs->heads; | |
1526 | *psecs = bs->secs; | |
1527 | } | |
1528 | ||
5bbdbb46 BS |
1529 | /* Recognize floppy formats */ |
1530 | typedef struct FDFormat { | |
1531 | FDriveType drive; | |
1532 | uint8_t last_sect; | |
1533 | uint8_t max_track; | |
1534 | uint8_t max_head; | |
1535 | } FDFormat; | |
1536 | ||
1537 | static const FDFormat fd_formats[] = { | |
1538 | /* First entry is default format */ | |
1539 | /* 1.44 MB 3"1/2 floppy disks */ | |
1540 | { FDRIVE_DRV_144, 18, 80, 1, }, | |
1541 | { FDRIVE_DRV_144, 20, 80, 1, }, | |
1542 | { FDRIVE_DRV_144, 21, 80, 1, }, | |
1543 | { FDRIVE_DRV_144, 21, 82, 1, }, | |
1544 | { FDRIVE_DRV_144, 21, 83, 1, }, | |
1545 | { FDRIVE_DRV_144, 22, 80, 1, }, | |
1546 | { FDRIVE_DRV_144, 23, 80, 1, }, | |
1547 | { FDRIVE_DRV_144, 24, 80, 1, }, | |
1548 | /* 2.88 MB 3"1/2 floppy disks */ | |
1549 | { FDRIVE_DRV_288, 36, 80, 1, }, | |
1550 | { FDRIVE_DRV_288, 39, 80, 1, }, | |
1551 | { FDRIVE_DRV_288, 40, 80, 1, }, | |
1552 | { FDRIVE_DRV_288, 44, 80, 1, }, | |
1553 | { FDRIVE_DRV_288, 48, 80, 1, }, | |
1554 | /* 720 kB 3"1/2 floppy disks */ | |
1555 | { FDRIVE_DRV_144, 9, 80, 1, }, | |
1556 | { FDRIVE_DRV_144, 10, 80, 1, }, | |
1557 | { FDRIVE_DRV_144, 10, 82, 1, }, | |
1558 | { FDRIVE_DRV_144, 10, 83, 1, }, | |
1559 | { FDRIVE_DRV_144, 13, 80, 1, }, | |
1560 | { FDRIVE_DRV_144, 14, 80, 1, }, | |
1561 | /* 1.2 MB 5"1/4 floppy disks */ | |
1562 | { FDRIVE_DRV_120, 15, 80, 1, }, | |
1563 | { FDRIVE_DRV_120, 18, 80, 1, }, | |
1564 | { FDRIVE_DRV_120, 18, 82, 1, }, | |
1565 | { FDRIVE_DRV_120, 18, 83, 1, }, | |
1566 | { FDRIVE_DRV_120, 20, 80, 1, }, | |
1567 | /* 720 kB 5"1/4 floppy disks */ | |
1568 | { FDRIVE_DRV_120, 9, 80, 1, }, | |
1569 | { FDRIVE_DRV_120, 11, 80, 1, }, | |
1570 | /* 360 kB 5"1/4 floppy disks */ | |
1571 | { FDRIVE_DRV_120, 9, 40, 1, }, | |
1572 | { FDRIVE_DRV_120, 9, 40, 0, }, | |
1573 | { FDRIVE_DRV_120, 10, 41, 1, }, | |
1574 | { FDRIVE_DRV_120, 10, 42, 1, }, | |
1575 | /* 320 kB 5"1/4 floppy disks */ | |
1576 | { FDRIVE_DRV_120, 8, 40, 1, }, | |
1577 | { FDRIVE_DRV_120, 8, 40, 0, }, | |
1578 | /* 360 kB must match 5"1/4 better than 3"1/2... */ | |
1579 | { FDRIVE_DRV_144, 9, 80, 0, }, | |
1580 | /* end */ | |
1581 | { FDRIVE_DRV_NONE, -1, -1, 0, }, | |
1582 | }; | |
1583 | ||
1584 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
1585 | int *max_track, int *last_sect, | |
1586 | FDriveType drive_in, FDriveType *drive) | |
1587 | { | |
1588 | const FDFormat *parse; | |
1589 | uint64_t nb_sectors, size; | |
1590 | int i, first_match, match; | |
1591 | ||
1592 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
1593 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
1594 | /* User defined disk */ | |
1595 | } else { | |
1596 | bdrv_get_geometry(bs, &nb_sectors); | |
1597 | match = -1; | |
1598 | first_match = -1; | |
1599 | for (i = 0; ; i++) { | |
1600 | parse = &fd_formats[i]; | |
1601 | if (parse->drive == FDRIVE_DRV_NONE) { | |
1602 | break; | |
1603 | } | |
1604 | if (drive_in == parse->drive || | |
1605 | drive_in == FDRIVE_DRV_NONE) { | |
1606 | size = (parse->max_head + 1) * parse->max_track * | |
1607 | parse->last_sect; | |
1608 | if (nb_sectors == size) { | |
1609 | match = i; | |
1610 | break; | |
1611 | } | |
1612 | if (first_match == -1) { | |
1613 | first_match = i; | |
1614 | } | |
1615 | } | |
1616 | } | |
1617 | if (match == -1) { | |
1618 | if (first_match == -1) { | |
1619 | match = 1; | |
1620 | } else { | |
1621 | match = first_match; | |
1622 | } | |
1623 | parse = &fd_formats[match]; | |
1624 | } | |
1625 | *nb_heads = parse->max_head + 1; | |
1626 | *max_track = parse->max_track; | |
1627 | *last_sect = parse->last_sect; | |
1628 | *drive = parse->drive; | |
1629 | } | |
1630 | } | |
1631 | ||
46d4767d FB |
1632 | int bdrv_get_translation_hint(BlockDriverState *bs) |
1633 | { | |
1634 | return bs->translation; | |
1635 | } | |
1636 | ||
abd7f68d MA |
1637 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
1638 | BlockErrorAction on_write_error) | |
1639 | { | |
1640 | bs->on_read_error = on_read_error; | |
1641 | bs->on_write_error = on_write_error; | |
1642 | } | |
1643 | ||
1644 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
1645 | { | |
1646 | return is_read ? bs->on_read_error : bs->on_write_error; | |
1647 | } | |
1648 | ||
b338082b FB |
1649 | int bdrv_is_read_only(BlockDriverState *bs) |
1650 | { | |
1651 | return bs->read_only; | |
1652 | } | |
1653 | ||
985a03b0 TS |
1654 | int bdrv_is_sg(BlockDriverState *bs) |
1655 | { | |
1656 | return bs->sg; | |
1657 | } | |
1658 | ||
e900a7b7 CH |
1659 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1660 | { | |
1661 | return bs->enable_write_cache; | |
1662 | } | |
1663 | ||
ea2384d3 FB |
1664 | int bdrv_is_encrypted(BlockDriverState *bs) |
1665 | { | |
1666 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1667 | return 1; | |
1668 | return bs->encrypted; | |
1669 | } | |
1670 | ||
c0f4ce77 AL |
1671 | int bdrv_key_required(BlockDriverState *bs) |
1672 | { | |
1673 | BlockDriverState *backing_hd = bs->backing_hd; | |
1674 | ||
1675 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1676 | return 1; | |
1677 | return (bs->encrypted && !bs->valid_key); | |
1678 | } | |
1679 | ||
ea2384d3 FB |
1680 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1681 | { | |
1682 | int ret; | |
1683 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1684 | ret = bdrv_set_key(bs->backing_hd, key); | |
1685 | if (ret < 0) | |
1686 | return ret; | |
1687 | if (!bs->encrypted) | |
1688 | return 0; | |
1689 | } | |
fd04a2ae SH |
1690 | if (!bs->encrypted) { |
1691 | return -EINVAL; | |
1692 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1693 | return -ENOMEDIUM; | |
1694 | } | |
c0f4ce77 | 1695 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1696 | if (ret < 0) { |
1697 | bs->valid_key = 0; | |
1698 | } else if (!bs->valid_key) { | |
1699 | bs->valid_key = 1; | |
1700 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 1701 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 1702 | } |
c0f4ce77 | 1703 | return ret; |
ea2384d3 FB |
1704 | } |
1705 | ||
1706 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1707 | { | |
19cb3738 | 1708 | if (!bs->drv) { |
ea2384d3 FB |
1709 | buf[0] = '\0'; |
1710 | } else { | |
1711 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1712 | } | |
1713 | } | |
1714 | ||
5fafdf24 | 1715 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1716 | void *opaque) |
1717 | { | |
1718 | BlockDriver *drv; | |
1719 | ||
8a22f02a | 1720 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
1721 | it(opaque, drv->format_name); |
1722 | } | |
1723 | } | |
1724 | ||
b338082b FB |
1725 | BlockDriverState *bdrv_find(const char *name) |
1726 | { | |
1727 | BlockDriverState *bs; | |
1728 | ||
1b7bdbc1 SH |
1729 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1730 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 1731 | return bs; |
1b7bdbc1 | 1732 | } |
b338082b FB |
1733 | } |
1734 | return NULL; | |
1735 | } | |
1736 | ||
2f399b0a MA |
1737 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
1738 | { | |
1739 | if (!bs) { | |
1740 | return QTAILQ_FIRST(&bdrv_states); | |
1741 | } | |
1742 | return QTAILQ_NEXT(bs, list); | |
1743 | } | |
1744 | ||
51de9760 | 1745 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1746 | { |
1747 | BlockDriverState *bs; | |
1748 | ||
1b7bdbc1 | 1749 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 1750 | it(opaque, bs); |
81d0912d FB |
1751 | } |
1752 | } | |
1753 | ||
ea2384d3 FB |
1754 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1755 | { | |
1756 | return bs->device_name; | |
1757 | } | |
1758 | ||
205ef796 | 1759 | int bdrv_flush(BlockDriverState *bs) |
7a6cba61 | 1760 | { |
016f5cf6 | 1761 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
205ef796 KW |
1762 | return 0; |
1763 | } | |
1764 | ||
e7a8a783 KW |
1765 | if (bs->drv && bdrv_has_async_flush(bs->drv) && qemu_in_coroutine()) { |
1766 | return bdrv_co_flush_em(bs); | |
1767 | } | |
1768 | ||
205ef796 KW |
1769 | if (bs->drv && bs->drv->bdrv_flush) { |
1770 | return bs->drv->bdrv_flush(bs); | |
016f5cf6 AG |
1771 | } |
1772 | ||
205ef796 KW |
1773 | /* |
1774 | * Some block drivers always operate in either writethrough or unsafe mode | |
1775 | * and don't support bdrv_flush therefore. Usually qemu doesn't know how | |
1776 | * the server works (because the behaviour is hardcoded or depends on | |
1777 | * server-side configuration), so we can't ensure that everything is safe | |
1778 | * on disk. Returning an error doesn't work because that would break guests | |
1779 | * even if the server operates in writethrough mode. | |
1780 | * | |
1781 | * Let's hope the user knows what he's doing. | |
1782 | */ | |
1783 | return 0; | |
7a6cba61 PB |
1784 | } |
1785 | ||
c6ca28d6 AL |
1786 | void bdrv_flush_all(void) |
1787 | { | |
1788 | BlockDriverState *bs; | |
1789 | ||
1b7bdbc1 | 1790 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
c602a489 | 1791 | if (!bdrv_is_read_only(bs) && bdrv_is_inserted(bs)) { |
c6ca28d6 | 1792 | bdrv_flush(bs); |
1b7bdbc1 SH |
1793 | } |
1794 | } | |
c6ca28d6 AL |
1795 | } |
1796 | ||
f2feebbd KW |
1797 | int bdrv_has_zero_init(BlockDriverState *bs) |
1798 | { | |
1799 | assert(bs->drv); | |
1800 | ||
336c1c12 KW |
1801 | if (bs->drv->bdrv_has_zero_init) { |
1802 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
1803 | } |
1804 | ||
1805 | return 1; | |
1806 | } | |
1807 | ||
bb8bf76f CH |
1808 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
1809 | { | |
1810 | if (!bs->drv) { | |
1811 | return -ENOMEDIUM; | |
1812 | } | |
1813 | if (!bs->drv->bdrv_discard) { | |
1814 | return 0; | |
1815 | } | |
1816 | return bs->drv->bdrv_discard(bs, sector_num, nb_sectors); | |
1817 | } | |
1818 | ||
f58c7b35 TS |
1819 | /* |
1820 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1821 | * not implementing the functionality are assumed to not support backing files, | |
1822 | * hence all their sectors are reported as allocated. | |
1823 | * | |
1824 | * 'pnum' is set to the number of sectors (including and immediately following | |
1825 | * the specified sector) that are known to be in the same | |
1826 | * allocated/unallocated state. | |
1827 | * | |
1828 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1829 | */ | |
1830 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1831 | int *pnum) | |
1832 | { | |
1833 | int64_t n; | |
1834 | if (!bs->drv->bdrv_is_allocated) { | |
1835 | if (sector_num >= bs->total_sectors) { | |
1836 | *pnum = 0; | |
1837 | return 0; | |
1838 | } | |
1839 | n = bs->total_sectors - sector_num; | |
1840 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1841 | return 1; | |
1842 | } | |
1843 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1844 | } | |
1845 | ||
2582bfed LC |
1846 | void bdrv_mon_event(const BlockDriverState *bdrv, |
1847 | BlockMonEventAction action, int is_read) | |
1848 | { | |
1849 | QObject *data; | |
1850 | const char *action_str; | |
1851 | ||
1852 | switch (action) { | |
1853 | case BDRV_ACTION_REPORT: | |
1854 | action_str = "report"; | |
1855 | break; | |
1856 | case BDRV_ACTION_IGNORE: | |
1857 | action_str = "ignore"; | |
1858 | break; | |
1859 | case BDRV_ACTION_STOP: | |
1860 | action_str = "stop"; | |
1861 | break; | |
1862 | default: | |
1863 | abort(); | |
1864 | } | |
1865 | ||
1866 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1867 | bdrv->device_name, | |
1868 | action_str, | |
1869 | is_read ? "read" : "write"); | |
1870 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1871 | ||
1872 | qobject_decref(data); | |
1873 | } | |
1874 | ||
d15e5465 | 1875 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1876 | { |
d15e5465 LC |
1877 | QDict *bs_dict; |
1878 | Monitor *mon = opaque; | |
1879 | ||
1880 | bs_dict = qobject_to_qdict(obj); | |
1881 | ||
d8aeeb31 | 1882 | monitor_printf(mon, "%s: removable=%d", |
d15e5465 | 1883 | qdict_get_str(bs_dict, "device"), |
d15e5465 LC |
1884 | qdict_get_bool(bs_dict, "removable")); |
1885 | ||
1886 | if (qdict_get_bool(bs_dict, "removable")) { | |
1887 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
e4def80b MA |
1888 | monitor_printf(mon, " tray-open=%d", |
1889 | qdict_get_bool(bs_dict, "tray-open")); | |
d15e5465 | 1890 | } |
d2078cc2 LC |
1891 | |
1892 | if (qdict_haskey(bs_dict, "io-status")) { | |
1893 | monitor_printf(mon, " io-status=%s", qdict_get_str(bs_dict, "io-status")); | |
1894 | } | |
1895 | ||
d15e5465 LC |
1896 | if (qdict_haskey(bs_dict, "inserted")) { |
1897 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1898 | ||
1899 | monitor_printf(mon, " file="); | |
1900 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1901 | if (qdict_haskey(qdict, "backing_file")) { | |
1902 | monitor_printf(mon, " backing_file="); | |
1903 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1904 | } | |
1905 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1906 | qdict_get_bool(qdict, "ro"), | |
1907 | qdict_get_str(qdict, "drv"), | |
1908 | qdict_get_bool(qdict, "encrypted")); | |
1909 | } else { | |
1910 | monitor_printf(mon, " [not inserted]"); | |
1911 | } | |
1912 | ||
1913 | monitor_printf(mon, "\n"); | |
1914 | } | |
1915 | ||
1916 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1917 | { | |
1918 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1919 | } | |
1920 | ||
f04ef601 LC |
1921 | static const char *const io_status_name[BDRV_IOS_MAX] = { |
1922 | [BDRV_IOS_OK] = "ok", | |
1923 | [BDRV_IOS_FAILED] = "failed", | |
1924 | [BDRV_IOS_ENOSPC] = "nospace", | |
1925 | }; | |
1926 | ||
d15e5465 LC |
1927 | void bdrv_info(Monitor *mon, QObject **ret_data) |
1928 | { | |
1929 | QList *bs_list; | |
b338082b FB |
1930 | BlockDriverState *bs; |
1931 | ||
d15e5465 LC |
1932 | bs_list = qlist_new(); |
1933 | ||
1b7bdbc1 | 1934 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
d15e5465 | 1935 | QObject *bs_obj; |
e4def80b | 1936 | QDict *bs_dict; |
d15e5465 | 1937 | |
d8aeeb31 | 1938 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': 'unknown', " |
d15e5465 | 1939 | "'removable': %i, 'locked': %i }", |
2c6942fa MA |
1940 | bs->device_name, |
1941 | bdrv_dev_has_removable_media(bs), | |
f107639a | 1942 | bdrv_dev_is_medium_locked(bs)); |
e4def80b | 1943 | bs_dict = qobject_to_qdict(bs_obj); |
d15e5465 | 1944 | |
e4def80b MA |
1945 | if (bdrv_dev_has_removable_media(bs)) { |
1946 | qdict_put(bs_dict, "tray-open", | |
1947 | qbool_from_int(bdrv_dev_is_tray_open(bs))); | |
1948 | } | |
f04ef601 LC |
1949 | |
1950 | if (bdrv_iostatus_is_enabled(bs)) { | |
1951 | qdict_put(bs_dict, "io-status", | |
1952 | qstring_from_str(io_status_name[bs->iostatus])); | |
1953 | } | |
1954 | ||
19cb3738 | 1955 | if (bs->drv) { |
d15e5465 | 1956 | QObject *obj; |
d15e5465 LC |
1957 | |
1958 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1959 | "'encrypted': %i }", | |
1960 | bs->filename, bs->read_only, | |
1961 | bs->drv->format_name, | |
1962 | bdrv_is_encrypted(bs)); | |
fef30743 | 1963 | if (bs->backing_file[0] != '\0') { |
d15e5465 LC |
1964 | QDict *qdict = qobject_to_qdict(obj); |
1965 | qdict_put(qdict, "backing_file", | |
1966 | qstring_from_str(bs->backing_file)); | |
376253ec | 1967 | } |
d15e5465 LC |
1968 | |
1969 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1970 | } |
d15e5465 | 1971 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1972 | } |
d15e5465 LC |
1973 | |
1974 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1975 | } |
a36e69dd | 1976 | |
218a536a | 1977 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1978 | { |
218a536a LC |
1979 | QDict *qdict; |
1980 | Monitor *mon = opaque; | |
1981 | ||
1982 | qdict = qobject_to_qdict(data); | |
1983 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1984 | ||
1985 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1986 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1987 | " wr_bytes=%" PRId64 | |
1988 | " rd_operations=%" PRId64 | |
1989 | " wr_operations=%" PRId64 | |
e8045d67 | 1990 | " flush_operations=%" PRId64 |
c488c7f6 CH |
1991 | " wr_total_time_ns=%" PRId64 |
1992 | " rd_total_time_ns=%" PRId64 | |
1993 | " flush_total_time_ns=%" PRId64 | |
218a536a LC |
1994 | "\n", |
1995 | qdict_get_int(qdict, "rd_bytes"), | |
1996 | qdict_get_int(qdict, "wr_bytes"), | |
1997 | qdict_get_int(qdict, "rd_operations"), | |
e8045d67 | 1998 | qdict_get_int(qdict, "wr_operations"), |
c488c7f6 CH |
1999 | qdict_get_int(qdict, "flush_operations"), |
2000 | qdict_get_int(qdict, "wr_total_time_ns"), | |
2001 | qdict_get_int(qdict, "rd_total_time_ns"), | |
2002 | qdict_get_int(qdict, "flush_total_time_ns")); | |
218a536a LC |
2003 | } |
2004 | ||
2005 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
2006 | { | |
2007 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
2008 | } | |
2009 | ||
294cc35f KW |
2010 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) |
2011 | { | |
2012 | QObject *res; | |
2013 | QDict *dict; | |
2014 | ||
2015 | res = qobject_from_jsonf("{ 'stats': {" | |
2016 | "'rd_bytes': %" PRId64 "," | |
2017 | "'wr_bytes': %" PRId64 "," | |
2018 | "'rd_operations': %" PRId64 "," | |
2019 | "'wr_operations': %" PRId64 "," | |
e8045d67 | 2020 | "'wr_highest_offset': %" PRId64 "," |
c488c7f6 CH |
2021 | "'flush_operations': %" PRId64 "," |
2022 | "'wr_total_time_ns': %" PRId64 "," | |
2023 | "'rd_total_time_ns': %" PRId64 "," | |
2024 | "'flush_total_time_ns': %" PRId64 | |
294cc35f | 2025 | "} }", |
a597e79c CH |
2026 | bs->nr_bytes[BDRV_ACCT_READ], |
2027 | bs->nr_bytes[BDRV_ACCT_WRITE], | |
2028 | bs->nr_ops[BDRV_ACCT_READ], | |
2029 | bs->nr_ops[BDRV_ACCT_WRITE], | |
5ffbbc67 | 2030 | bs->wr_highest_sector * |
e8045d67 | 2031 | (uint64_t)BDRV_SECTOR_SIZE, |
c488c7f6 CH |
2032 | bs->nr_ops[BDRV_ACCT_FLUSH], |
2033 | bs->total_time_ns[BDRV_ACCT_WRITE], | |
2034 | bs->total_time_ns[BDRV_ACCT_READ], | |
2035 | bs->total_time_ns[BDRV_ACCT_FLUSH]); | |
294cc35f KW |
2036 | dict = qobject_to_qdict(res); |
2037 | ||
2038 | if (*bs->device_name) { | |
2039 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
2040 | } | |
2041 | ||
2042 | if (bs->file) { | |
2043 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
2044 | qdict_put_obj(dict, "parent", parent); | |
2045 | } | |
2046 | ||
2047 | return res; | |
2048 | } | |
2049 | ||
218a536a LC |
2050 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) |
2051 | { | |
2052 | QObject *obj; | |
2053 | QList *devices; | |
a36e69dd TS |
2054 | BlockDriverState *bs; |
2055 | ||
218a536a LC |
2056 | devices = qlist_new(); |
2057 | ||
1b7bdbc1 | 2058 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
294cc35f | 2059 | obj = bdrv_info_stats_bs(bs); |
218a536a | 2060 | qlist_append_obj(devices, obj); |
a36e69dd | 2061 | } |
218a536a LC |
2062 | |
2063 | *ret_data = QOBJECT(devices); | |
a36e69dd | 2064 | } |
ea2384d3 | 2065 | |
045df330 AL |
2066 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
2067 | { | |
2068 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2069 | return bs->backing_file; | |
2070 | else if (bs->encrypted) | |
2071 | return bs->filename; | |
2072 | else | |
2073 | return NULL; | |
2074 | } | |
2075 | ||
5fafdf24 | 2076 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
2077 | char *filename, int filename_size) |
2078 | { | |
b783e409 | 2079 | if (!bs->backing_file) { |
83f64091 FB |
2080 | pstrcpy(filename, filename_size, ""); |
2081 | } else { | |
2082 | pstrcpy(filename, filename_size, bs->backing_file); | |
2083 | } | |
2084 | } | |
2085 | ||
5fafdf24 | 2086 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
2087 | const uint8_t *buf, int nb_sectors) |
2088 | { | |
2089 | BlockDriver *drv = bs->drv; | |
2090 | if (!drv) | |
19cb3738 | 2091 | return -ENOMEDIUM; |
faea38e7 FB |
2092 | if (!drv->bdrv_write_compressed) |
2093 | return -ENOTSUP; | |
fbb7b4e0 KW |
2094 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2095 | return -EIO; | |
a55eb92c | 2096 | |
c6d22830 | 2097 | if (bs->dirty_bitmap) { |
7cd1e32a | 2098 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
2099 | } | |
a55eb92c | 2100 | |
faea38e7 FB |
2101 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
2102 | } | |
3b46e624 | 2103 | |
faea38e7 FB |
2104 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
2105 | { | |
2106 | BlockDriver *drv = bs->drv; | |
2107 | if (!drv) | |
19cb3738 | 2108 | return -ENOMEDIUM; |
faea38e7 FB |
2109 | if (!drv->bdrv_get_info) |
2110 | return -ENOTSUP; | |
2111 | memset(bdi, 0, sizeof(*bdi)); | |
2112 | return drv->bdrv_get_info(bs, bdi); | |
2113 | } | |
2114 | ||
45566e9c CH |
2115 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
2116 | int64_t pos, int size) | |
178e08a5 AL |
2117 | { |
2118 | BlockDriver *drv = bs->drv; | |
2119 | if (!drv) | |
2120 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2121 | if (drv->bdrv_save_vmstate) |
2122 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
2123 | if (bs->file) | |
2124 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
2125 | return -ENOTSUP; | |
178e08a5 AL |
2126 | } |
2127 | ||
45566e9c CH |
2128 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2129 | int64_t pos, int size) | |
178e08a5 AL |
2130 | { |
2131 | BlockDriver *drv = bs->drv; | |
2132 | if (!drv) | |
2133 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2134 | if (drv->bdrv_load_vmstate) |
2135 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
2136 | if (bs->file) | |
2137 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
2138 | return -ENOTSUP; | |
178e08a5 AL |
2139 | } |
2140 | ||
8b9b0cc2 KW |
2141 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
2142 | { | |
2143 | BlockDriver *drv = bs->drv; | |
2144 | ||
2145 | if (!drv || !drv->bdrv_debug_event) { | |
2146 | return; | |
2147 | } | |
2148 | ||
2149 | return drv->bdrv_debug_event(bs, event); | |
2150 | ||
2151 | } | |
2152 | ||
faea38e7 FB |
2153 | /**************************************************************/ |
2154 | /* handling of snapshots */ | |
2155 | ||
feeee5ac MDCF |
2156 | int bdrv_can_snapshot(BlockDriverState *bs) |
2157 | { | |
2158 | BlockDriver *drv = bs->drv; | |
07b70bfb | 2159 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
feeee5ac MDCF |
2160 | return 0; |
2161 | } | |
2162 | ||
2163 | if (!drv->bdrv_snapshot_create) { | |
2164 | if (bs->file != NULL) { | |
2165 | return bdrv_can_snapshot(bs->file); | |
2166 | } | |
2167 | return 0; | |
2168 | } | |
2169 | ||
2170 | return 1; | |
2171 | } | |
2172 | ||
199630b6 BS |
2173 | int bdrv_is_snapshot(BlockDriverState *bs) |
2174 | { | |
2175 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
2176 | } | |
2177 | ||
f9092b10 MA |
2178 | BlockDriverState *bdrv_snapshots(void) |
2179 | { | |
2180 | BlockDriverState *bs; | |
2181 | ||
3ac906f7 | 2182 | if (bs_snapshots) { |
f9092b10 | 2183 | return bs_snapshots; |
3ac906f7 | 2184 | } |
f9092b10 MA |
2185 | |
2186 | bs = NULL; | |
2187 | while ((bs = bdrv_next(bs))) { | |
2188 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
2189 | bs_snapshots = bs; |
2190 | return bs; | |
f9092b10 MA |
2191 | } |
2192 | } | |
2193 | return NULL; | |
f9092b10 MA |
2194 | } |
2195 | ||
5fafdf24 | 2196 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
2197 | QEMUSnapshotInfo *sn_info) |
2198 | { | |
2199 | BlockDriver *drv = bs->drv; | |
2200 | if (!drv) | |
19cb3738 | 2201 | return -ENOMEDIUM; |
7cdb1f6d MK |
2202 | if (drv->bdrv_snapshot_create) |
2203 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2204 | if (bs->file) | |
2205 | return bdrv_snapshot_create(bs->file, sn_info); | |
2206 | return -ENOTSUP; | |
faea38e7 FB |
2207 | } |
2208 | ||
5fafdf24 | 2209 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
2210 | const char *snapshot_id) |
2211 | { | |
2212 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
2213 | int ret, open_ret; |
2214 | ||
faea38e7 | 2215 | if (!drv) |
19cb3738 | 2216 | return -ENOMEDIUM; |
7cdb1f6d MK |
2217 | if (drv->bdrv_snapshot_goto) |
2218 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2219 | ||
2220 | if (bs->file) { | |
2221 | drv->bdrv_close(bs); | |
2222 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2223 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2224 | if (open_ret < 0) { | |
2225 | bdrv_delete(bs->file); | |
2226 | bs->drv = NULL; | |
2227 | return open_ret; | |
2228 | } | |
2229 | return ret; | |
2230 | } | |
2231 | ||
2232 | return -ENOTSUP; | |
faea38e7 FB |
2233 | } |
2234 | ||
2235 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2236 | { | |
2237 | BlockDriver *drv = bs->drv; | |
2238 | if (!drv) | |
19cb3738 | 2239 | return -ENOMEDIUM; |
7cdb1f6d MK |
2240 | if (drv->bdrv_snapshot_delete) |
2241 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2242 | if (bs->file) | |
2243 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2244 | return -ENOTSUP; | |
faea38e7 FB |
2245 | } |
2246 | ||
5fafdf24 | 2247 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
2248 | QEMUSnapshotInfo **psn_info) |
2249 | { | |
2250 | BlockDriver *drv = bs->drv; | |
2251 | if (!drv) | |
19cb3738 | 2252 | return -ENOMEDIUM; |
7cdb1f6d MK |
2253 | if (drv->bdrv_snapshot_list) |
2254 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2255 | if (bs->file) | |
2256 | return bdrv_snapshot_list(bs->file, psn_info); | |
2257 | return -ENOTSUP; | |
faea38e7 FB |
2258 | } |
2259 | ||
51ef6727 | 2260 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
2261 | const char *snapshot_name) | |
2262 | { | |
2263 | BlockDriver *drv = bs->drv; | |
2264 | if (!drv) { | |
2265 | return -ENOMEDIUM; | |
2266 | } | |
2267 | if (!bs->read_only) { | |
2268 | return -EINVAL; | |
2269 | } | |
2270 | if (drv->bdrv_snapshot_load_tmp) { | |
2271 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2272 | } | |
2273 | return -ENOTSUP; | |
2274 | } | |
2275 | ||
faea38e7 FB |
2276 | #define NB_SUFFIXES 4 |
2277 | ||
2278 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2279 | { | |
2280 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2281 | int64_t base; | |
2282 | int i; | |
2283 | ||
2284 | if (size <= 999) { | |
2285 | snprintf(buf, buf_size, "%" PRId64, size); | |
2286 | } else { | |
2287 | base = 1024; | |
2288 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2289 | if (size < (10 * base)) { | |
5fafdf24 | 2290 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
2291 | (double)size / base, |
2292 | suffixes[i]); | |
2293 | break; | |
2294 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 2295 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
2296 | ((size + (base >> 1)) / base), |
2297 | suffixes[i]); | |
2298 | break; | |
2299 | } | |
2300 | base = base * 1024; | |
2301 | } | |
2302 | } | |
2303 | return buf; | |
2304 | } | |
2305 | ||
2306 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
2307 | { | |
2308 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
2309 | #ifdef _WIN32 |
2310 | struct tm *ptm; | |
2311 | #else | |
faea38e7 | 2312 | struct tm tm; |
3b9f94e1 | 2313 | #endif |
faea38e7 FB |
2314 | time_t ti; |
2315 | int64_t secs; | |
2316 | ||
2317 | if (!sn) { | |
5fafdf24 TS |
2318 | snprintf(buf, buf_size, |
2319 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
2320 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
2321 | } else { | |
2322 | ti = sn->date_sec; | |
3b9f94e1 FB |
2323 | #ifdef _WIN32 |
2324 | ptm = localtime(&ti); | |
2325 | strftime(date_buf, sizeof(date_buf), | |
2326 | "%Y-%m-%d %H:%M:%S", ptm); | |
2327 | #else | |
faea38e7 FB |
2328 | localtime_r(&ti, &tm); |
2329 | strftime(date_buf, sizeof(date_buf), | |
2330 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 2331 | #endif |
faea38e7 FB |
2332 | secs = sn->vm_clock_nsec / 1000000000; |
2333 | snprintf(clock_buf, sizeof(clock_buf), | |
2334 | "%02d:%02d:%02d.%03d", | |
2335 | (int)(secs / 3600), | |
2336 | (int)((secs / 60) % 60), | |
5fafdf24 | 2337 | (int)(secs % 60), |
faea38e7 FB |
2338 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
2339 | snprintf(buf, buf_size, | |
5fafdf24 | 2340 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
2341 | sn->id_str, sn->name, |
2342 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
2343 | date_buf, | |
2344 | clock_buf); | |
2345 | } | |
2346 | return buf; | |
2347 | } | |
2348 | ||
ea2384d3 | 2349 | /**************************************************************/ |
83f64091 | 2350 | /* async I/Os */ |
ea2384d3 | 2351 | |
3b69e4b9 | 2352 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 2353 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 2354 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
2355 | { |
2356 | BlockDriver *drv = bs->drv; | |
83f64091 | 2357 | |
bbf0a440 SH |
2358 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
2359 | ||
19cb3738 | 2360 | if (!drv) |
ce1a14dc | 2361 | return NULL; |
71d0770c AL |
2362 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2363 | return NULL; | |
3b46e624 | 2364 | |
a597e79c CH |
2365 | return drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
2366 | cb, opaque); | |
ea2384d3 FB |
2367 | } |
2368 | ||
4dcafbb1 MT |
2369 | typedef struct BlockCompleteData { |
2370 | BlockDriverCompletionFunc *cb; | |
2371 | void *opaque; | |
2372 | BlockDriverState *bs; | |
2373 | int64_t sector_num; | |
2374 | int nb_sectors; | |
2375 | } BlockCompleteData; | |
2376 | ||
2377 | static void block_complete_cb(void *opaque, int ret) | |
2378 | { | |
2379 | BlockCompleteData *b = opaque; | |
2380 | ||
2381 | if (b->bs->dirty_bitmap) { | |
2382 | set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1); | |
2383 | } | |
2384 | b->cb(b->opaque, ret); | |
7267c094 | 2385 | g_free(b); |
4dcafbb1 MT |
2386 | } |
2387 | ||
2388 | static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs, | |
2389 | int64_t sector_num, | |
2390 | int nb_sectors, | |
2391 | BlockDriverCompletionFunc *cb, | |
2392 | void *opaque) | |
2393 | { | |
7267c094 | 2394 | BlockCompleteData *blkdata = g_malloc0(sizeof(BlockCompleteData)); |
4dcafbb1 MT |
2395 | |
2396 | blkdata->bs = bs; | |
2397 | blkdata->cb = cb; | |
2398 | blkdata->opaque = opaque; | |
2399 | blkdata->sector_num = sector_num; | |
2400 | blkdata->nb_sectors = nb_sectors; | |
2401 | ||
2402 | return blkdata; | |
2403 | } | |
2404 | ||
f141eafe AL |
2405 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
2406 | QEMUIOVector *qiov, int nb_sectors, | |
2407 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 2408 | { |
83f64091 | 2409 | BlockDriver *drv = bs->drv; |
a36e69dd | 2410 | BlockDriverAIOCB *ret; |
4dcafbb1 | 2411 | BlockCompleteData *blk_cb_data; |
ea2384d3 | 2412 | |
bbf0a440 SH |
2413 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
2414 | ||
19cb3738 | 2415 | if (!drv) |
ce1a14dc | 2416 | return NULL; |
83f64091 | 2417 | if (bs->read_only) |
ce1a14dc | 2418 | return NULL; |
71d0770c AL |
2419 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2420 | return NULL; | |
83f64091 | 2421 | |
c6d22830 | 2422 | if (bs->dirty_bitmap) { |
4dcafbb1 MT |
2423 | blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb, |
2424 | opaque); | |
2425 | cb = &block_complete_cb; | |
2426 | opaque = blk_cb_data; | |
7cd1e32a | 2427 | } |
a55eb92c | 2428 | |
f141eafe AL |
2429 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
2430 | cb, opaque); | |
a36e69dd TS |
2431 | |
2432 | if (ret) { | |
294cc35f KW |
2433 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
2434 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2435 | } | |
a36e69dd TS |
2436 | } |
2437 | ||
2438 | return ret; | |
83f64091 FB |
2439 | } |
2440 | ||
40b4f539 KW |
2441 | |
2442 | typedef struct MultiwriteCB { | |
2443 | int error; | |
2444 | int num_requests; | |
2445 | int num_callbacks; | |
2446 | struct { | |
2447 | BlockDriverCompletionFunc *cb; | |
2448 | void *opaque; | |
2449 | QEMUIOVector *free_qiov; | |
2450 | void *free_buf; | |
2451 | } callbacks[]; | |
2452 | } MultiwriteCB; | |
2453 | ||
2454 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
2455 | { | |
2456 | int i; | |
2457 | ||
2458 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2459 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
2460 | if (mcb->callbacks[i].free_qiov) { |
2461 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2462 | } | |
7267c094 | 2463 | g_free(mcb->callbacks[i].free_qiov); |
f8a83245 | 2464 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
2465 | } |
2466 | } | |
2467 | ||
2468 | static void multiwrite_cb(void *opaque, int ret) | |
2469 | { | |
2470 | MultiwriteCB *mcb = opaque; | |
2471 | ||
6d519a5f SH |
2472 | trace_multiwrite_cb(mcb, ret); |
2473 | ||
cb6d3ca0 | 2474 | if (ret < 0 && !mcb->error) { |
40b4f539 | 2475 | mcb->error = ret; |
40b4f539 KW |
2476 | } |
2477 | ||
2478 | mcb->num_requests--; | |
2479 | if (mcb->num_requests == 0) { | |
de189a1b | 2480 | multiwrite_user_cb(mcb); |
7267c094 | 2481 | g_free(mcb); |
40b4f539 KW |
2482 | } |
2483 | } | |
2484 | ||
2485 | static int multiwrite_req_compare(const void *a, const void *b) | |
2486 | { | |
77be4366 CH |
2487 | const BlockRequest *req1 = a, *req2 = b; |
2488 | ||
2489 | /* | |
2490 | * Note that we can't simply subtract req2->sector from req1->sector | |
2491 | * here as that could overflow the return value. | |
2492 | */ | |
2493 | if (req1->sector > req2->sector) { | |
2494 | return 1; | |
2495 | } else if (req1->sector < req2->sector) { | |
2496 | return -1; | |
2497 | } else { | |
2498 | return 0; | |
2499 | } | |
40b4f539 KW |
2500 | } |
2501 | ||
2502 | /* | |
2503 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2504 | * requests that remain after merging. | |
2505 | */ | |
2506 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2507 | int num_reqs, MultiwriteCB *mcb) | |
2508 | { | |
2509 | int i, outidx; | |
2510 | ||
2511 | // Sort requests by start sector | |
2512 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2513 | ||
2514 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2515 | // filling up gaps with zero sectors. | |
2516 | outidx = 0; | |
2517 | for (i = 1; i < num_reqs; i++) { | |
2518 | int merge = 0; | |
2519 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2520 | ||
2521 | // This handles the cases that are valid for all block drivers, namely | |
2522 | // exactly sequential writes and overlapping writes. | |
2523 | if (reqs[i].sector <= oldreq_last) { | |
2524 | merge = 1; | |
2525 | } | |
2526 | ||
2527 | // The block driver may decide that it makes sense to combine requests | |
2528 | // even if there is a gap of some sectors between them. In this case, | |
2529 | // the gap is filled with zeros (therefore only applicable for yet | |
2530 | // unused space in format like qcow2). | |
2531 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2532 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2533 | } | |
2534 | ||
e2a305fb CH |
2535 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
2536 | merge = 0; | |
2537 | } | |
2538 | ||
40b4f539 KW |
2539 | if (merge) { |
2540 | size_t size; | |
7267c094 | 2541 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
2542 | qemu_iovec_init(qiov, |
2543 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2544 | ||
2545 | // Add the first request to the merged one. If the requests are | |
2546 | // overlapping, drop the last sectors of the first request. | |
2547 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2548 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2549 | ||
2550 | // We might need to add some zeros between the two requests | |
2551 | if (reqs[i].sector > oldreq_last) { | |
2552 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2553 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2554 | memset(buf, 0, zero_bytes); | |
2555 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2556 | mcb->callbacks[i].free_buf = buf; | |
2557 | } | |
2558 | ||
2559 | // Add the second request | |
2560 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2561 | ||
cbf1dff2 | 2562 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
2563 | reqs[outidx].qiov = qiov; |
2564 | ||
2565 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2566 | } else { | |
2567 | outidx++; | |
2568 | reqs[outidx].sector = reqs[i].sector; | |
2569 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2570 | reqs[outidx].qiov = reqs[i].qiov; | |
2571 | } | |
2572 | } | |
2573 | ||
2574 | return outidx + 1; | |
2575 | } | |
2576 | ||
2577 | /* | |
2578 | * Submit multiple AIO write requests at once. | |
2579 | * | |
2580 | * On success, the function returns 0 and all requests in the reqs array have | |
2581 | * been submitted. In error case this function returns -1, and any of the | |
2582 | * requests may or may not be submitted yet. In particular, this means that the | |
2583 | * callback will be called for some of the requests, for others it won't. The | |
2584 | * caller must check the error field of the BlockRequest to wait for the right | |
2585 | * callbacks (if error != 0, no callback will be called). | |
2586 | * | |
2587 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2588 | * requests. However, the fields opaque and error are left unmodified as they | |
2589 | * are used to signal failure for a single request to the caller. | |
2590 | */ | |
2591 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2592 | { | |
2593 | BlockDriverAIOCB *acb; | |
2594 | MultiwriteCB *mcb; | |
2595 | int i; | |
2596 | ||
301db7c2 RH |
2597 | /* don't submit writes if we don't have a medium */ |
2598 | if (bs->drv == NULL) { | |
2599 | for (i = 0; i < num_reqs; i++) { | |
2600 | reqs[i].error = -ENOMEDIUM; | |
2601 | } | |
2602 | return -1; | |
2603 | } | |
2604 | ||
40b4f539 KW |
2605 | if (num_reqs == 0) { |
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | // Create MultiwriteCB structure | |
7267c094 | 2610 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
2611 | mcb->num_requests = 0; |
2612 | mcb->num_callbacks = num_reqs; | |
2613 | ||
2614 | for (i = 0; i < num_reqs; i++) { | |
2615 | mcb->callbacks[i].cb = reqs[i].cb; | |
2616 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2617 | } | |
2618 | ||
2619 | // Check for mergable requests | |
2620 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2621 | ||
6d519a5f SH |
2622 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
2623 | ||
453f9a16 KW |
2624 | /* |
2625 | * Run the aio requests. As soon as one request can't be submitted | |
2626 | * successfully, fail all requests that are not yet submitted (we must | |
2627 | * return failure for all requests anyway) | |
2628 | * | |
2629 | * num_requests cannot be set to the right value immediately: If | |
2630 | * bdrv_aio_writev fails for some request, num_requests would be too high | |
2631 | * and therefore multiwrite_cb() would never recognize the multiwrite | |
2632 | * request as completed. We also cannot use the loop variable i to set it | |
2633 | * when the first request fails because the callback may already have been | |
2634 | * called for previously submitted requests. Thus, num_requests must be | |
2635 | * incremented for each request that is submitted. | |
2636 | * | |
2637 | * The problem that callbacks may be called early also means that we need | |
2638 | * to take care that num_requests doesn't become 0 before all requests are | |
2639 | * submitted - multiwrite_cb() would consider the multiwrite request | |
2640 | * completed. A dummy request that is "completed" by a manual call to | |
2641 | * multiwrite_cb() takes care of this. | |
2642 | */ | |
2643 | mcb->num_requests = 1; | |
2644 | ||
6d519a5f | 2645 | // Run the aio requests |
40b4f539 | 2646 | for (i = 0; i < num_reqs; i++) { |
453f9a16 | 2647 | mcb->num_requests++; |
40b4f539 KW |
2648 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
2649 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2650 | ||
2651 | if (acb == NULL) { | |
2652 | // We can only fail the whole thing if no request has been | |
2653 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2654 | // complete and report the error in the callback. | |
453f9a16 | 2655 | if (i == 0) { |
6d519a5f | 2656 | trace_bdrv_aio_multiwrite_earlyfail(mcb); |
40b4f539 KW |
2657 | goto fail; |
2658 | } else { | |
6d519a5f | 2659 | trace_bdrv_aio_multiwrite_latefail(mcb, i); |
7eb58a6c | 2660 | multiwrite_cb(mcb, -EIO); |
40b4f539 KW |
2661 | break; |
2662 | } | |
40b4f539 KW |
2663 | } |
2664 | } | |
2665 | ||
453f9a16 KW |
2666 | /* Complete the dummy request */ |
2667 | multiwrite_cb(mcb, 0); | |
2668 | ||
40b4f539 KW |
2669 | return 0; |
2670 | ||
2671 | fail: | |
453f9a16 KW |
2672 | for (i = 0; i < mcb->num_callbacks; i++) { |
2673 | reqs[i].error = -EIO; | |
2674 | } | |
7267c094 | 2675 | g_free(mcb); |
40b4f539 KW |
2676 | return -1; |
2677 | } | |
2678 | ||
b2e12bc6 CH |
2679 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2680 | BlockDriverCompletionFunc *cb, void *opaque) | |
2681 | { | |
2682 | BlockDriver *drv = bs->drv; | |
2683 | ||
a13aac04 SH |
2684 | trace_bdrv_aio_flush(bs, opaque); |
2685 | ||
016f5cf6 AG |
2686 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
2687 | return bdrv_aio_noop_em(bs, cb, opaque); | |
2688 | } | |
2689 | ||
b2e12bc6 CH |
2690 | if (!drv) |
2691 | return NULL; | |
b2e12bc6 CH |
2692 | return drv->bdrv_aio_flush(bs, cb, opaque); |
2693 | } | |
2694 | ||
83f64091 | 2695 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 2696 | { |
6bbff9a0 | 2697 | acb->pool->cancel(acb); |
83f64091 FB |
2698 | } |
2699 | ||
ce1a14dc | 2700 | |
83f64091 FB |
2701 | /**************************************************************/ |
2702 | /* async block device emulation */ | |
2703 | ||
c16b5a2c CH |
2704 | typedef struct BlockDriverAIOCBSync { |
2705 | BlockDriverAIOCB common; | |
2706 | QEMUBH *bh; | |
2707 | int ret; | |
2708 | /* vector translation state */ | |
2709 | QEMUIOVector *qiov; | |
2710 | uint8_t *bounce; | |
2711 | int is_write; | |
2712 | } BlockDriverAIOCBSync; | |
2713 | ||
2714 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2715 | { | |
b666d239 KW |
2716 | BlockDriverAIOCBSync *acb = |
2717 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 2718 | qemu_bh_delete(acb->bh); |
36afc451 | 2719 | acb->bh = NULL; |
c16b5a2c CH |
2720 | qemu_aio_release(acb); |
2721 | } | |
2722 | ||
2723 | static AIOPool bdrv_em_aio_pool = { | |
2724 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2725 | .cancel = bdrv_aio_cancel_em, | |
2726 | }; | |
2727 | ||
ce1a14dc | 2728 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 2729 | { |
ce1a14dc | 2730 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 2731 | |
f141eafe AL |
2732 | if (!acb->is_write) |
2733 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 2734 | qemu_vfree(acb->bounce); |
ce1a14dc | 2735 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 2736 | qemu_bh_delete(acb->bh); |
36afc451 | 2737 | acb->bh = NULL; |
ce1a14dc | 2738 | qemu_aio_release(acb); |
83f64091 | 2739 | } |
beac80cd | 2740 | |
f141eafe AL |
2741 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
2742 | int64_t sector_num, | |
2743 | QEMUIOVector *qiov, | |
2744 | int nb_sectors, | |
2745 | BlockDriverCompletionFunc *cb, | |
2746 | void *opaque, | |
2747 | int is_write) | |
2748 | ||
83f64091 | 2749 | { |
ce1a14dc | 2750 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 2751 | |
c16b5a2c | 2752 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
2753 | acb->is_write = is_write; |
2754 | acb->qiov = qiov; | |
e268ca52 | 2755 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 2756 | |
ce1a14dc PB |
2757 | if (!acb->bh) |
2758 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
2759 | |
2760 | if (is_write) { | |
2761 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1ed20acf | 2762 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 2763 | } else { |
1ed20acf | 2764 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
2765 | } |
2766 | ||
ce1a14dc | 2767 | qemu_bh_schedule(acb->bh); |
f141eafe | 2768 | |
ce1a14dc | 2769 | return &acb->common; |
beac80cd FB |
2770 | } |
2771 | ||
f141eafe AL |
2772 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
2773 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 2774 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 2775 | { |
f141eafe AL |
2776 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2777 | } | |
83f64091 | 2778 | |
f141eafe AL |
2779 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
2780 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2781 | BlockDriverCompletionFunc *cb, void *opaque) | |
2782 | { | |
2783 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 2784 | } |
beac80cd | 2785 | |
68485420 KW |
2786 | |
2787 | typedef struct BlockDriverAIOCBCoroutine { | |
2788 | BlockDriverAIOCB common; | |
2789 | BlockRequest req; | |
2790 | bool is_write; | |
2791 | QEMUBH* bh; | |
2792 | } BlockDriverAIOCBCoroutine; | |
2793 | ||
2794 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
2795 | { | |
2796 | qemu_aio_flush(); | |
2797 | } | |
2798 | ||
2799 | static AIOPool bdrv_em_co_aio_pool = { | |
2800 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), | |
2801 | .cancel = bdrv_aio_co_cancel_em, | |
2802 | }; | |
2803 | ||
2804 | static void bdrv_co_rw_bh(void *opaque) | |
2805 | { | |
2806 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2807 | ||
2808 | acb->common.cb(acb->common.opaque, acb->req.error); | |
2809 | qemu_bh_delete(acb->bh); | |
2810 | qemu_aio_release(acb); | |
2811 | } | |
2812 | ||
2813 | static void coroutine_fn bdrv_co_rw(void *opaque) | |
2814 | { | |
2815 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2816 | BlockDriverState *bs = acb->common.bs; | |
2817 | ||
2818 | if (!acb->is_write) { | |
2819 | acb->req.error = bs->drv->bdrv_co_readv(bs, acb->req.sector, | |
2820 | acb->req.nb_sectors, acb->req.qiov); | |
2821 | } else { | |
2822 | acb->req.error = bs->drv->bdrv_co_writev(bs, acb->req.sector, | |
2823 | acb->req.nb_sectors, acb->req.qiov); | |
2824 | } | |
2825 | ||
2826 | acb->bh = qemu_bh_new(bdrv_co_rw_bh, acb); | |
2827 | qemu_bh_schedule(acb->bh); | |
2828 | } | |
2829 | ||
2830 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, | |
2831 | int64_t sector_num, | |
2832 | QEMUIOVector *qiov, | |
2833 | int nb_sectors, | |
2834 | BlockDriverCompletionFunc *cb, | |
2835 | void *opaque, | |
2836 | bool is_write) | |
2837 | { | |
2838 | Coroutine *co; | |
2839 | BlockDriverAIOCBCoroutine *acb; | |
2840 | ||
2841 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
2842 | acb->req.sector = sector_num; | |
2843 | acb->req.nb_sectors = nb_sectors; | |
2844 | acb->req.qiov = qiov; | |
2845 | acb->is_write = is_write; | |
2846 | ||
2847 | co = qemu_coroutine_create(bdrv_co_rw); | |
2848 | qemu_coroutine_enter(co, acb); | |
2849 | ||
2850 | return &acb->common; | |
2851 | } | |
2852 | ||
2853 | static BlockDriverAIOCB *bdrv_co_aio_readv_em(BlockDriverState *bs, | |
2854 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2855 | BlockDriverCompletionFunc *cb, void *opaque) | |
2856 | { | |
2857 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, | |
2858 | false); | |
2859 | } | |
2860 | ||
2861 | static BlockDriverAIOCB *bdrv_co_aio_writev_em(BlockDriverState *bs, | |
2862 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2863 | BlockDriverCompletionFunc *cb, void *opaque) | |
2864 | { | |
2865 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, | |
2866 | true); | |
2867 | } | |
2868 | ||
b2e12bc6 CH |
2869 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
2870 | BlockDriverCompletionFunc *cb, void *opaque) | |
2871 | { | |
2872 | BlockDriverAIOCBSync *acb; | |
2873 | ||
2874 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2875 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2876 | acb->qiov = NULL; | |
2877 | acb->bounce = NULL; | |
2878 | acb->ret = 0; | |
2879 | ||
2880 | if (!acb->bh) | |
2881 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2882 | ||
2883 | bdrv_flush(bs); | |
2884 | qemu_bh_schedule(acb->bh); | |
2885 | return &acb->common; | |
2886 | } | |
2887 | ||
016f5cf6 AG |
2888 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
2889 | BlockDriverCompletionFunc *cb, void *opaque) | |
2890 | { | |
2891 | BlockDriverAIOCBSync *acb; | |
2892 | ||
2893 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2894 | acb->is_write = 1; /* don't bounce in the completion handler */ | |
2895 | acb->qiov = NULL; | |
2896 | acb->bounce = NULL; | |
2897 | acb->ret = 0; | |
2898 | ||
2899 | if (!acb->bh) { | |
2900 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2901 | } | |
2902 | ||
2903 | qemu_bh_schedule(acb->bh); | |
2904 | return &acb->common; | |
2905 | } | |
2906 | ||
83f64091 FB |
2907 | /**************************************************************/ |
2908 | /* sync block device emulation */ | |
ea2384d3 | 2909 | |
83f64091 FB |
2910 | static void bdrv_rw_em_cb(void *opaque, int ret) |
2911 | { | |
2912 | *(int *)opaque = ret; | |
ea2384d3 FB |
2913 | } |
2914 | ||
83f64091 FB |
2915 | #define NOT_DONE 0x7fffffff |
2916 | ||
5fafdf24 | 2917 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 2918 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 2919 | { |
ce1a14dc PB |
2920 | int async_ret; |
2921 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2922 | struct iovec iov; |
2923 | QEMUIOVector qiov; | |
83f64091 | 2924 | |
83f64091 | 2925 | async_ret = NOT_DONE; |
3f4cb3d3 | 2926 | iov.iov_base = (void *)buf; |
eb5a3165 | 2927 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe | 2928 | qemu_iovec_init_external(&qiov, &iov, 1); |
1ed20acf SH |
2929 | |
2930 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2931 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2932 | if (acb == NULL) { |
2933 | async_ret = -1; | |
2934 | goto fail; | |
2935 | } | |
baf35cb9 | 2936 | |
83f64091 FB |
2937 | while (async_ret == NOT_DONE) { |
2938 | qemu_aio_wait(); | |
2939 | } | |
baf35cb9 | 2940 | |
65d6b3d8 KW |
2941 | |
2942 | fail: | |
83f64091 | 2943 | return async_ret; |
7a6cba61 PB |
2944 | } |
2945 | ||
83f64091 FB |
2946 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2947 | const uint8_t *buf, int nb_sectors) | |
2948 | { | |
ce1a14dc PB |
2949 | int async_ret; |
2950 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2951 | struct iovec iov; |
2952 | QEMUIOVector qiov; | |
83f64091 | 2953 | |
83f64091 | 2954 | async_ret = NOT_DONE; |
f141eafe | 2955 | iov.iov_base = (void *)buf; |
eb5a3165 | 2956 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe | 2957 | qemu_iovec_init_external(&qiov, &iov, 1); |
1ed20acf SH |
2958 | |
2959 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2960 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2961 | if (acb == NULL) { |
2962 | async_ret = -1; | |
2963 | goto fail; | |
2964 | } | |
83f64091 FB |
2965 | while (async_ret == NOT_DONE) { |
2966 | qemu_aio_wait(); | |
2967 | } | |
65d6b3d8 KW |
2968 | |
2969 | fail: | |
83f64091 FB |
2970 | return async_ret; |
2971 | } | |
ea2384d3 FB |
2972 | |
2973 | void bdrv_init(void) | |
2974 | { | |
5efa9d5a | 2975 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 2976 | } |
ce1a14dc | 2977 | |
eb852011 MA |
2978 | void bdrv_init_with_whitelist(void) |
2979 | { | |
2980 | use_bdrv_whitelist = 1; | |
2981 | bdrv_init(); | |
2982 | } | |
2983 | ||
c16b5a2c CH |
2984 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
2985 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 2986 | { |
ce1a14dc PB |
2987 | BlockDriverAIOCB *acb; |
2988 | ||
6bbff9a0 AL |
2989 | if (pool->free_aiocb) { |
2990 | acb = pool->free_aiocb; | |
2991 | pool->free_aiocb = acb->next; | |
ce1a14dc | 2992 | } else { |
7267c094 | 2993 | acb = g_malloc0(pool->aiocb_size); |
6bbff9a0 | 2994 | acb->pool = pool; |
ce1a14dc PB |
2995 | } |
2996 | acb->bs = bs; | |
2997 | acb->cb = cb; | |
2998 | acb->opaque = opaque; | |
2999 | return acb; | |
3000 | } | |
3001 | ||
3002 | void qemu_aio_release(void *p) | |
3003 | { | |
6bbff9a0 AL |
3004 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
3005 | AIOPool *pool = acb->pool; | |
3006 | acb->next = pool->free_aiocb; | |
3007 | pool->free_aiocb = acb; | |
ce1a14dc | 3008 | } |
19cb3738 | 3009 | |
f9f05dc5 KW |
3010 | /**************************************************************/ |
3011 | /* Coroutine block device emulation */ | |
3012 | ||
3013 | typedef struct CoroutineIOCompletion { | |
3014 | Coroutine *coroutine; | |
3015 | int ret; | |
3016 | } CoroutineIOCompletion; | |
3017 | ||
3018 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3019 | { | |
3020 | CoroutineIOCompletion *co = opaque; | |
3021 | ||
3022 | co->ret = ret; | |
3023 | qemu_coroutine_enter(co->coroutine, NULL); | |
3024 | } | |
3025 | ||
3026 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3027 | int nb_sectors, QEMUIOVector *iov, | |
3028 | bool is_write) | |
3029 | { | |
3030 | CoroutineIOCompletion co = { | |
3031 | .coroutine = qemu_coroutine_self(), | |
3032 | }; | |
3033 | BlockDriverAIOCB *acb; | |
3034 | ||
3035 | if (is_write) { | |
a652d160 SH |
3036 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3037 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3038 | } else { |
a652d160 SH |
3039 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3040 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3041 | } |
3042 | ||
59370aaa | 3043 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3044 | if (!acb) { |
3045 | return -EIO; | |
3046 | } | |
3047 | qemu_coroutine_yield(); | |
3048 | ||
3049 | return co.ret; | |
3050 | } | |
3051 | ||
3052 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
3053 | int64_t sector_num, int nb_sectors, | |
3054 | QEMUIOVector *iov) | |
3055 | { | |
3056 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
3057 | } | |
3058 | ||
3059 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
3060 | int64_t sector_num, int nb_sectors, | |
3061 | QEMUIOVector *iov) | |
3062 | { | |
3063 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
3064 | } | |
3065 | ||
e7a8a783 KW |
3066 | static int coroutine_fn bdrv_co_flush_em(BlockDriverState *bs) |
3067 | { | |
3068 | CoroutineIOCompletion co = { | |
3069 | .coroutine = qemu_coroutine_self(), | |
3070 | }; | |
3071 | BlockDriverAIOCB *acb; | |
3072 | ||
3073 | acb = bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
3074 | if (!acb) { | |
3075 | return -EIO; | |
3076 | } | |
3077 | qemu_coroutine_yield(); | |
3078 | return co.ret; | |
3079 | } | |
3080 | ||
19cb3738 FB |
3081 | /**************************************************************/ |
3082 | /* removable device support */ | |
3083 | ||
3084 | /** | |
3085 | * Return TRUE if the media is present | |
3086 | */ | |
3087 | int bdrv_is_inserted(BlockDriverState *bs) | |
3088 | { | |
3089 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 3090 | |
19cb3738 FB |
3091 | if (!drv) |
3092 | return 0; | |
3093 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
3094 | return 1; |
3095 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
3096 | } |
3097 | ||
3098 | /** | |
8e49ca46 MA |
3099 | * Return whether the media changed since the last call to this |
3100 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
3101 | */ |
3102 | int bdrv_media_changed(BlockDriverState *bs) | |
3103 | { | |
3104 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3105 | |
8e49ca46 MA |
3106 | if (drv && drv->bdrv_media_changed) { |
3107 | return drv->bdrv_media_changed(bs); | |
3108 | } | |
3109 | return -ENOTSUP; | |
19cb3738 FB |
3110 | } |
3111 | ||
3112 | /** | |
3113 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
3114 | */ | |
fdec4404 | 3115 | void bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
3116 | { |
3117 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3118 | |
822e1cd1 MA |
3119 | if (drv && drv->bdrv_eject) { |
3120 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 FB |
3121 | } |
3122 | } | |
3123 | ||
19cb3738 FB |
3124 | /** |
3125 | * Lock or unlock the media (if it is locked, the user won't be able | |
3126 | * to eject it manually). | |
3127 | */ | |
025e849a | 3128 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
3129 | { |
3130 | BlockDriver *drv = bs->drv; | |
3131 | ||
025e849a | 3132 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 3133 | |
025e849a MA |
3134 | if (drv && drv->bdrv_lock_medium) { |
3135 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
3136 | } |
3137 | } | |
985a03b0 TS |
3138 | |
3139 | /* needed for generic scsi interface */ | |
3140 | ||
3141 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
3142 | { | |
3143 | BlockDriver *drv = bs->drv; | |
3144 | ||
3145 | if (drv && drv->bdrv_ioctl) | |
3146 | return drv->bdrv_ioctl(bs, req, buf); | |
3147 | return -ENOTSUP; | |
3148 | } | |
7d780669 | 3149 | |
221f715d AL |
3150 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
3151 | unsigned long int req, void *buf, | |
3152 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 3153 | { |
221f715d | 3154 | BlockDriver *drv = bs->drv; |
7d780669 | 3155 | |
221f715d AL |
3156 | if (drv && drv->bdrv_aio_ioctl) |
3157 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
3158 | return NULL; | |
7d780669 | 3159 | } |
e268ca52 | 3160 | |
7b6f9300 MA |
3161 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
3162 | { | |
3163 | bs->buffer_alignment = align; | |
3164 | } | |
7cd1e32a | 3165 | |
e268ca52 AL |
3166 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
3167 | { | |
3168 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
3169 | } | |
7cd1e32a | 3170 | |
3171 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
3172 | { | |
3173 | int64_t bitmap_size; | |
a55eb92c | 3174 | |
aaa0eb75 | 3175 | bs->dirty_count = 0; |
a55eb92c | 3176 | if (enable) { |
c6d22830 JK |
3177 | if (!bs->dirty_bitmap) { |
3178 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
3179 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
3180 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 3181 | |
7267c094 | 3182 | bs->dirty_bitmap = g_malloc0(bitmap_size); |
a55eb92c | 3183 | } |
7cd1e32a | 3184 | } else { |
c6d22830 | 3185 | if (bs->dirty_bitmap) { |
7267c094 | 3186 | g_free(bs->dirty_bitmap); |
c6d22830 | 3187 | bs->dirty_bitmap = NULL; |
a55eb92c | 3188 | } |
7cd1e32a | 3189 | } |
3190 | } | |
3191 | ||
3192 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
3193 | { | |
6ea44308 | 3194 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 3195 | |
c6d22830 JK |
3196 | if (bs->dirty_bitmap && |
3197 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
6d59fec1 MT |
3198 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
3199 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
7cd1e32a | 3200 | } else { |
3201 | return 0; | |
3202 | } | |
3203 | } | |
3204 | ||
a55eb92c JK |
3205 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
3206 | int nr_sectors) | |
7cd1e32a | 3207 | { |
3208 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
3209 | } | |
aaa0eb75 LS |
3210 | |
3211 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
3212 | { | |
3213 | return bs->dirty_count; | |
3214 | } | |
f88e1a42 | 3215 | |
db593f25 MT |
3216 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
3217 | { | |
3218 | assert(bs->in_use != in_use); | |
3219 | bs->in_use = in_use; | |
3220 | } | |
3221 | ||
3222 | int bdrv_in_use(BlockDriverState *bs) | |
3223 | { | |
3224 | return bs->in_use; | |
3225 | } | |
3226 | ||
28a7282a LC |
3227 | void bdrv_iostatus_enable(BlockDriverState *bs) |
3228 | { | |
3229 | bs->iostatus = BDRV_IOS_OK; | |
3230 | } | |
3231 | ||
3232 | /* The I/O status is only enabled if the drive explicitly | |
3233 | * enables it _and_ the VM is configured to stop on errors */ | |
3234 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
3235 | { | |
3236 | return (bs->iostatus != BDRV_IOS_INVAL && | |
3237 | (bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || | |
3238 | bs->on_write_error == BLOCK_ERR_STOP_ANY || | |
3239 | bs->on_read_error == BLOCK_ERR_STOP_ANY)); | |
3240 | } | |
3241 | ||
3242 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
3243 | { | |
3244 | bs->iostatus = BDRV_IOS_INVAL; | |
3245 | } | |
3246 | ||
3247 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
3248 | { | |
3249 | if (bdrv_iostatus_is_enabled(bs)) { | |
3250 | bs->iostatus = BDRV_IOS_OK; | |
3251 | } | |
3252 | } | |
3253 | ||
3254 | /* XXX: Today this is set by device models because it makes the implementation | |
3255 | quite simple. However, the block layer knows about the error, so it's | |
3256 | possible to implement this without device models being involved */ | |
3257 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) | |
3258 | { | |
3259 | if (bdrv_iostatus_is_enabled(bs) && bs->iostatus == BDRV_IOS_OK) { | |
3260 | assert(error >= 0); | |
3261 | bs->iostatus = error == ENOSPC ? BDRV_IOS_ENOSPC : BDRV_IOS_FAILED; | |
3262 | } | |
3263 | } | |
3264 | ||
a597e79c CH |
3265 | void |
3266 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
3267 | enum BlockAcctType type) | |
3268 | { | |
3269 | assert(type < BDRV_MAX_IOTYPE); | |
3270 | ||
3271 | cookie->bytes = bytes; | |
c488c7f6 | 3272 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
3273 | cookie->type = type; |
3274 | } | |
3275 | ||
3276 | void | |
3277 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
3278 | { | |
3279 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
3280 | ||
3281 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
3282 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 3283 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
3284 | } |
3285 | ||
f88e1a42 JS |
3286 | int bdrv_img_create(const char *filename, const char *fmt, |
3287 | const char *base_filename, const char *base_fmt, | |
3288 | char *options, uint64_t img_size, int flags) | |
3289 | { | |
3290 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 3291 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
3292 | BlockDriverState *bs = NULL; |
3293 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 3294 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
3295 | int ret = 0; |
3296 | ||
3297 | /* Find driver and parse its options */ | |
3298 | drv = bdrv_find_format(fmt); | |
3299 | if (!drv) { | |
3300 | error_report("Unknown file format '%s'", fmt); | |
4f70f249 | 3301 | ret = -EINVAL; |
f88e1a42 JS |
3302 | goto out; |
3303 | } | |
3304 | ||
3305 | proto_drv = bdrv_find_protocol(filename); | |
3306 | if (!proto_drv) { | |
3307 | error_report("Unknown protocol '%s'", filename); | |
4f70f249 | 3308 | ret = -EINVAL; |
f88e1a42 JS |
3309 | goto out; |
3310 | } | |
3311 | ||
3312 | create_options = append_option_parameters(create_options, | |
3313 | drv->create_options); | |
3314 | create_options = append_option_parameters(create_options, | |
3315 | proto_drv->create_options); | |
3316 | ||
3317 | /* Create parameter list with default values */ | |
3318 | param = parse_option_parameters("", create_options, param); | |
3319 | ||
3320 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
3321 | ||
3322 | /* Parse -o options */ | |
3323 | if (options) { | |
3324 | param = parse_option_parameters(options, create_options, param); | |
3325 | if (param == NULL) { | |
3326 | error_report("Invalid options for file format '%s'.", fmt); | |
4f70f249 | 3327 | ret = -EINVAL; |
f88e1a42 JS |
3328 | goto out; |
3329 | } | |
3330 | } | |
3331 | ||
3332 | if (base_filename) { | |
3333 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
3334 | base_filename)) { | |
3335 | error_report("Backing file not supported for file format '%s'", | |
3336 | fmt); | |
4f70f249 | 3337 | ret = -EINVAL; |
f88e1a42 JS |
3338 | goto out; |
3339 | } | |
3340 | } | |
3341 | ||
3342 | if (base_fmt) { | |
3343 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
3344 | error_report("Backing file format not supported for file " | |
3345 | "format '%s'", fmt); | |
4f70f249 | 3346 | ret = -EINVAL; |
f88e1a42 JS |
3347 | goto out; |
3348 | } | |
3349 | } | |
3350 | ||
792da93a JS |
3351 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
3352 | if (backing_file && backing_file->value.s) { | |
3353 | if (!strcmp(filename, backing_file->value.s)) { | |
3354 | error_report("Error: Trying to create an image with the " | |
3355 | "same filename as the backing file"); | |
4f70f249 | 3356 | ret = -EINVAL; |
792da93a JS |
3357 | goto out; |
3358 | } | |
3359 | } | |
3360 | ||
f88e1a42 JS |
3361 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
3362 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
3363 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
3364 | if (!backing_drv) { | |
f88e1a42 JS |
3365 | error_report("Unknown backing file format '%s'", |
3366 | backing_fmt->value.s); | |
4f70f249 | 3367 | ret = -EINVAL; |
f88e1a42 JS |
3368 | goto out; |
3369 | } | |
3370 | } | |
3371 | ||
3372 | // The size for the image must always be specified, with one exception: | |
3373 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
3374 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
3375 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
3376 | if (backing_file && backing_file->value.s) { |
3377 | uint64_t size; | |
f88e1a42 JS |
3378 | char buf[32]; |
3379 | ||
f88e1a42 JS |
3380 | bs = bdrv_new(""); |
3381 | ||
96df67d1 | 3382 | ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); |
f88e1a42 | 3383 | if (ret < 0) { |
96df67d1 | 3384 | error_report("Could not open '%s'", backing_file->value.s); |
f88e1a42 JS |
3385 | goto out; |
3386 | } | |
3387 | bdrv_get_geometry(bs, &size); | |
3388 | size *= 512; | |
3389 | ||
3390 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
3391 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
3392 | } else { | |
3393 | error_report("Image creation needs a size parameter"); | |
4f70f249 | 3394 | ret = -EINVAL; |
f88e1a42 JS |
3395 | goto out; |
3396 | } | |
3397 | } | |
3398 | ||
3399 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
3400 | print_option_parameters(param); | |
3401 | puts(""); | |
3402 | ||
3403 | ret = bdrv_create(drv, filename, param); | |
3404 | ||
3405 | if (ret < 0) { | |
3406 | if (ret == -ENOTSUP) { | |
3407 | error_report("Formatting or formatting option not supported for " | |
3408 | "file format '%s'", fmt); | |
3409 | } else if (ret == -EFBIG) { | |
3410 | error_report("The image size is too large for file format '%s'", | |
3411 | fmt); | |
3412 | } else { | |
3413 | error_report("%s: error while creating %s: %s", filename, fmt, | |
3414 | strerror(-ret)); | |
3415 | } | |
3416 | } | |
3417 | ||
3418 | out: | |
3419 | free_option_parameters(create_options); | |
3420 | free_option_parameters(param); | |
3421 | ||
3422 | if (bs) { | |
3423 | bdrv_delete(bs); | |
3424 | } | |
4f70f249 JS |
3425 | |
3426 | return ret; | |
f88e1a42 | 3427 | } |