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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
83c9089e | 27 | #include "monitor/monitor.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
1de7afc9 | 30 | #include "qemu/module.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qjson.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
b2023818 | 35 | #include "qmp-commands.h" |
1de7afc9 | 36 | #include "qemu/timer.h" |
fc01f7e7 | 37 | |
71e72a19 | 38 | #ifdef CONFIG_BSD |
7674e7bf FB |
39 | #include <sys/types.h> |
40 | #include <sys/stat.h> | |
41 | #include <sys/ioctl.h> | |
72cf2d4f | 42 | #include <sys/queue.h> |
c5e97233 | 43 | #ifndef __DragonFly__ |
7674e7bf FB |
44 | #include <sys/disk.h> |
45 | #endif | |
c5e97233 | 46 | #endif |
7674e7bf | 47 | |
49dc768d AL |
48 | #ifdef _WIN32 |
49 | #include <windows.h> | |
50 | #endif | |
51 | ||
1c9805a3 SH |
52 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
53 | ||
470c0504 SH |
54 | typedef enum { |
55 | BDRV_REQ_COPY_ON_READ = 0x1, | |
f08f2dda | 56 | BDRV_REQ_ZERO_WRITE = 0x2, |
470c0504 SH |
57 | } BdrvRequestFlags; |
58 | ||
7d4b4ba5 | 59 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
60 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
61 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 62 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
63 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
64 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 65 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
66 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
67 | int64_t sector_num, int nb_sectors, | |
68 | QEMUIOVector *iov); | |
69 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
70 | int64_t sector_num, int nb_sectors, | |
71 | QEMUIOVector *iov); | |
c5fbe571 | 72 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
73 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
74 | BdrvRequestFlags flags); | |
1c9805a3 | 75 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
f08f2dda SH |
76 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
77 | BdrvRequestFlags flags); | |
b2a61371 SH |
78 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
79 | int64_t sector_num, | |
80 | QEMUIOVector *qiov, | |
81 | int nb_sectors, | |
82 | BlockDriverCompletionFunc *cb, | |
83 | void *opaque, | |
8c5873d6 | 84 | bool is_write); |
b2a61371 | 85 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 KW |
86 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
87 | int64_t sector_num, int nb_sectors); | |
ec530c81 | 88 | |
98f90dba ZYW |
89 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
90 | bool is_write, double elapsed_time, uint64_t *wait); | |
91 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
92 | double elapsed_time, uint64_t *wait); | |
93 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
94 | bool is_write, int64_t *wait); | |
95 | ||
1b7bdbc1 SH |
96 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
97 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 98 | |
8a22f02a SH |
99 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
100 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 101 | |
f9092b10 MA |
102 | /* The device to use for VM snapshots */ |
103 | static BlockDriverState *bs_snapshots; | |
104 | ||
eb852011 MA |
105 | /* If non-zero, use only whitelisted block drivers */ |
106 | static int use_bdrv_whitelist; | |
107 | ||
9e0b22f4 SH |
108 | #ifdef _WIN32 |
109 | static int is_windows_drive_prefix(const char *filename) | |
110 | { | |
111 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
112 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
113 | filename[1] == ':'); | |
114 | } | |
115 | ||
116 | int is_windows_drive(const char *filename) | |
117 | { | |
118 | if (is_windows_drive_prefix(filename) && | |
119 | filename[2] == '\0') | |
120 | return 1; | |
121 | if (strstart(filename, "\\\\.\\", NULL) || | |
122 | strstart(filename, "//./", NULL)) | |
123 | return 1; | |
124 | return 0; | |
125 | } | |
126 | #endif | |
127 | ||
0563e191 | 128 | /* throttling disk I/O limits */ |
98f90dba ZYW |
129 | void bdrv_io_limits_disable(BlockDriverState *bs) |
130 | { | |
131 | bs->io_limits_enabled = false; | |
132 | ||
133 | while (qemu_co_queue_next(&bs->throttled_reqs)); | |
134 | ||
135 | if (bs->block_timer) { | |
136 | qemu_del_timer(bs->block_timer); | |
137 | qemu_free_timer(bs->block_timer); | |
138 | bs->block_timer = NULL; | |
139 | } | |
140 | ||
141 | bs->slice_start = 0; | |
142 | bs->slice_end = 0; | |
143 | bs->slice_time = 0; | |
144 | memset(&bs->io_base, 0, sizeof(bs->io_base)); | |
145 | } | |
146 | ||
0563e191 ZYW |
147 | static void bdrv_block_timer(void *opaque) |
148 | { | |
149 | BlockDriverState *bs = opaque; | |
150 | ||
151 | qemu_co_queue_next(&bs->throttled_reqs); | |
152 | } | |
153 | ||
154 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
155 | { | |
156 | qemu_co_queue_init(&bs->throttled_reqs); | |
157 | bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); | |
0563e191 ZYW |
158 | bs->io_limits_enabled = true; |
159 | } | |
160 | ||
161 | bool bdrv_io_limits_enabled(BlockDriverState *bs) | |
162 | { | |
163 | BlockIOLimit *io_limits = &bs->io_limits; | |
164 | return io_limits->bps[BLOCK_IO_LIMIT_READ] | |
165 | || io_limits->bps[BLOCK_IO_LIMIT_WRITE] | |
166 | || io_limits->bps[BLOCK_IO_LIMIT_TOTAL] | |
167 | || io_limits->iops[BLOCK_IO_LIMIT_READ] | |
168 | || io_limits->iops[BLOCK_IO_LIMIT_WRITE] | |
169 | || io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; | |
170 | } | |
171 | ||
98f90dba ZYW |
172 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
173 | bool is_write, int nb_sectors) | |
174 | { | |
175 | int64_t wait_time = -1; | |
176 | ||
177 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
178 | qemu_co_queue_wait(&bs->throttled_reqs); | |
179 | } | |
180 | ||
181 | /* In fact, we hope to keep each request's timing, in FIFO mode. The next | |
182 | * throttled requests will not be dequeued until the current request is | |
183 | * allowed to be serviced. So if the current request still exceeds the | |
184 | * limits, it will be inserted to the head. All requests followed it will | |
185 | * be still in throttled_reqs queue. | |
186 | */ | |
187 | ||
188 | while (bdrv_exceed_io_limits(bs, nb_sectors, is_write, &wait_time)) { | |
189 | qemu_mod_timer(bs->block_timer, | |
190 | wait_time + qemu_get_clock_ns(vm_clock)); | |
191 | qemu_co_queue_wait_insert_head(&bs->throttled_reqs); | |
192 | } | |
193 | ||
194 | qemu_co_queue_next(&bs->throttled_reqs); | |
195 | } | |
196 | ||
9e0b22f4 SH |
197 | /* check if the path starts with "<protocol>:" */ |
198 | static int path_has_protocol(const char *path) | |
199 | { | |
947995c0 PB |
200 | const char *p; |
201 | ||
9e0b22f4 SH |
202 | #ifdef _WIN32 |
203 | if (is_windows_drive(path) || | |
204 | is_windows_drive_prefix(path)) { | |
205 | return 0; | |
206 | } | |
947995c0 PB |
207 | p = path + strcspn(path, ":/\\"); |
208 | #else | |
209 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
210 | #endif |
211 | ||
947995c0 | 212 | return *p == ':'; |
9e0b22f4 SH |
213 | } |
214 | ||
83f64091 | 215 | int path_is_absolute(const char *path) |
3b0d4f61 | 216 | { |
21664424 FB |
217 | #ifdef _WIN32 |
218 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 219 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 220 | return 1; |
f53f4da9 PB |
221 | } |
222 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 223 | #else |
f53f4da9 | 224 | return (*path == '/'); |
3b9f94e1 | 225 | #endif |
3b0d4f61 FB |
226 | } |
227 | ||
83f64091 FB |
228 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
229 | path to it by considering it is relative to base_path. URL are | |
230 | supported. */ | |
231 | void path_combine(char *dest, int dest_size, | |
232 | const char *base_path, | |
233 | const char *filename) | |
3b0d4f61 | 234 | { |
83f64091 FB |
235 | const char *p, *p1; |
236 | int len; | |
237 | ||
238 | if (dest_size <= 0) | |
239 | return; | |
240 | if (path_is_absolute(filename)) { | |
241 | pstrcpy(dest, dest_size, filename); | |
242 | } else { | |
243 | p = strchr(base_path, ':'); | |
244 | if (p) | |
245 | p++; | |
246 | else | |
247 | p = base_path; | |
3b9f94e1 FB |
248 | p1 = strrchr(base_path, '/'); |
249 | #ifdef _WIN32 | |
250 | { | |
251 | const char *p2; | |
252 | p2 = strrchr(base_path, '\\'); | |
253 | if (!p1 || p2 > p1) | |
254 | p1 = p2; | |
255 | } | |
256 | #endif | |
83f64091 FB |
257 | if (p1) |
258 | p1++; | |
259 | else | |
260 | p1 = base_path; | |
261 | if (p1 > p) | |
262 | p = p1; | |
263 | len = p - base_path; | |
264 | if (len > dest_size - 1) | |
265 | len = dest_size - 1; | |
266 | memcpy(dest, base_path, len); | |
267 | dest[len] = '\0'; | |
268 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 269 | } |
3b0d4f61 FB |
270 | } |
271 | ||
dc5a1371 PB |
272 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
273 | { | |
274 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
275 | pstrcpy(dest, sz, bs->backing_file); | |
276 | } else { | |
277 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
278 | } | |
279 | } | |
280 | ||
5efa9d5a | 281 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 282 | { |
8c5873d6 SH |
283 | /* Block drivers without coroutine functions need emulation */ |
284 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
285 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
286 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
287 | ||
f8c35c1d SH |
288 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
289 | * the block driver lacks aio we need to emulate that too. | |
290 | */ | |
f9f05dc5 KW |
291 | if (!bdrv->bdrv_aio_readv) { |
292 | /* add AIO emulation layer */ | |
293 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
294 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 295 | } |
83f64091 | 296 | } |
b2e12bc6 | 297 | |
8a22f02a | 298 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 299 | } |
b338082b FB |
300 | |
301 | /* create a new block device (by default it is empty) */ | |
302 | BlockDriverState *bdrv_new(const char *device_name) | |
303 | { | |
1b7bdbc1 | 304 | BlockDriverState *bs; |
b338082b | 305 | |
7267c094 | 306 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 307 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 308 | if (device_name[0] != '\0') { |
1b7bdbc1 | 309 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 310 | } |
28a7282a | 311 | bdrv_iostatus_disable(bs); |
d7d512f6 PB |
312 | notifier_list_init(&bs->close_notifiers); |
313 | ||
b338082b FB |
314 | return bs; |
315 | } | |
316 | ||
d7d512f6 PB |
317 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
318 | { | |
319 | notifier_list_add(&bs->close_notifiers, notify); | |
320 | } | |
321 | ||
ea2384d3 FB |
322 | BlockDriver *bdrv_find_format(const char *format_name) |
323 | { | |
324 | BlockDriver *drv1; | |
8a22f02a SH |
325 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
326 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 327 | return drv1; |
8a22f02a | 328 | } |
ea2384d3 FB |
329 | } |
330 | return NULL; | |
331 | } | |
332 | ||
eb852011 MA |
333 | static int bdrv_is_whitelisted(BlockDriver *drv) |
334 | { | |
335 | static const char *whitelist[] = { | |
336 | CONFIG_BDRV_WHITELIST | |
337 | }; | |
338 | const char **p; | |
339 | ||
340 | if (!whitelist[0]) | |
341 | return 1; /* no whitelist, anything goes */ | |
342 | ||
343 | for (p = whitelist; *p; p++) { | |
344 | if (!strcmp(drv->format_name, *p)) { | |
345 | return 1; | |
346 | } | |
347 | } | |
348 | return 0; | |
349 | } | |
350 | ||
351 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
352 | { | |
353 | BlockDriver *drv = bdrv_find_format(format_name); | |
354 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
355 | } | |
356 | ||
5b7e1542 ZYW |
357 | typedef struct CreateCo { |
358 | BlockDriver *drv; | |
359 | char *filename; | |
360 | QEMUOptionParameter *options; | |
361 | int ret; | |
362 | } CreateCo; | |
363 | ||
364 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
365 | { | |
366 | CreateCo *cco = opaque; | |
367 | assert(cco->drv); | |
368 | ||
369 | cco->ret = cco->drv->bdrv_create(cco->filename, cco->options); | |
370 | } | |
371 | ||
0e7e1989 KW |
372 | int bdrv_create(BlockDriver *drv, const char* filename, |
373 | QEMUOptionParameter *options) | |
ea2384d3 | 374 | { |
5b7e1542 ZYW |
375 | int ret; |
376 | ||
377 | Coroutine *co; | |
378 | CreateCo cco = { | |
379 | .drv = drv, | |
380 | .filename = g_strdup(filename), | |
381 | .options = options, | |
382 | .ret = NOT_DONE, | |
383 | }; | |
384 | ||
385 | if (!drv->bdrv_create) { | |
80168bff LC |
386 | ret = -ENOTSUP; |
387 | goto out; | |
5b7e1542 ZYW |
388 | } |
389 | ||
390 | if (qemu_in_coroutine()) { | |
391 | /* Fast-path if already in coroutine context */ | |
392 | bdrv_create_co_entry(&cco); | |
393 | } else { | |
394 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
395 | qemu_coroutine_enter(co, &cco); | |
396 | while (cco.ret == NOT_DONE) { | |
397 | qemu_aio_wait(); | |
398 | } | |
399 | } | |
400 | ||
401 | ret = cco.ret; | |
0e7e1989 | 402 | |
80168bff LC |
403 | out: |
404 | g_free(cco.filename); | |
5b7e1542 | 405 | return ret; |
ea2384d3 FB |
406 | } |
407 | ||
84a12e66 CH |
408 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
409 | { | |
410 | BlockDriver *drv; | |
411 | ||
b50cbabc | 412 | drv = bdrv_find_protocol(filename); |
84a12e66 | 413 | if (drv == NULL) { |
16905d71 | 414 | return -ENOENT; |
84a12e66 CH |
415 | } |
416 | ||
417 | return bdrv_create(drv, filename, options); | |
418 | } | |
419 | ||
eba25057 JM |
420 | /* |
421 | * Create a uniquely-named empty temporary file. | |
422 | * Return 0 upon success, otherwise a negative errno value. | |
423 | */ | |
424 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 425 | { |
eba25057 | 426 | #ifdef _WIN32 |
3b9f94e1 | 427 | char temp_dir[MAX_PATH]; |
eba25057 JM |
428 | /* GetTempFileName requires that its output buffer (4th param) |
429 | have length MAX_PATH or greater. */ | |
430 | assert(size >= MAX_PATH); | |
431 | return (GetTempPath(MAX_PATH, temp_dir) | |
432 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
433 | ? 0 : -GetLastError()); | |
d5249393 | 434 | #else |
67b915a5 | 435 | int fd; |
7ccfb2eb | 436 | const char *tmpdir; |
0badc1ee AJ |
437 | tmpdir = getenv("TMPDIR"); |
438 | if (!tmpdir) | |
439 | tmpdir = "/tmp"; | |
eba25057 JM |
440 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
441 | return -EOVERFLOW; | |
442 | } | |
ea2384d3 | 443 | fd = mkstemp(filename); |
fe235a06 DH |
444 | if (fd < 0) { |
445 | return -errno; | |
446 | } | |
447 | if (close(fd) != 0) { | |
448 | unlink(filename); | |
eba25057 JM |
449 | return -errno; |
450 | } | |
451 | return 0; | |
d5249393 | 452 | #endif |
eba25057 | 453 | } |
fc01f7e7 | 454 | |
84a12e66 CH |
455 | /* |
456 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
457 | * recognized as a host CDROM. | |
458 | */ | |
459 | static BlockDriver *find_hdev_driver(const char *filename) | |
460 | { | |
461 | int score_max = 0, score; | |
462 | BlockDriver *drv = NULL, *d; | |
463 | ||
464 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
465 | if (d->bdrv_probe_device) { | |
466 | score = d->bdrv_probe_device(filename); | |
467 | if (score > score_max) { | |
468 | score_max = score; | |
469 | drv = d; | |
470 | } | |
471 | } | |
472 | } | |
473 | ||
474 | return drv; | |
475 | } | |
476 | ||
b50cbabc | 477 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
478 | { |
479 | BlockDriver *drv1; | |
480 | char protocol[128]; | |
1cec71e3 | 481 | int len; |
83f64091 | 482 | const char *p; |
19cb3738 | 483 | |
66f82cee KW |
484 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
485 | ||
39508e7a CH |
486 | /* |
487 | * XXX(hch): we really should not let host device detection | |
488 | * override an explicit protocol specification, but moving this | |
489 | * later breaks access to device names with colons in them. | |
490 | * Thanks to the brain-dead persistent naming schemes on udev- | |
491 | * based Linux systems those actually are quite common. | |
492 | */ | |
493 | drv1 = find_hdev_driver(filename); | |
494 | if (drv1) { | |
495 | return drv1; | |
496 | } | |
497 | ||
9e0b22f4 | 498 | if (!path_has_protocol(filename)) { |
39508e7a | 499 | return bdrv_find_format("file"); |
84a12e66 | 500 | } |
9e0b22f4 SH |
501 | p = strchr(filename, ':'); |
502 | assert(p != NULL); | |
1cec71e3 AL |
503 | len = p - filename; |
504 | if (len > sizeof(protocol) - 1) | |
505 | len = sizeof(protocol) - 1; | |
506 | memcpy(protocol, filename, len); | |
507 | protocol[len] = '\0'; | |
8a22f02a | 508 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 509 | if (drv1->protocol_name && |
8a22f02a | 510 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 511 | return drv1; |
8a22f02a | 512 | } |
83f64091 FB |
513 | } |
514 | return NULL; | |
515 | } | |
516 | ||
f500a6d3 KW |
517 | static int find_image_format(BlockDriverState *bs, const char *filename, |
518 | BlockDriver **pdrv) | |
f3a5d3f8 | 519 | { |
f500a6d3 | 520 | int score, score_max; |
f3a5d3f8 CH |
521 | BlockDriver *drv1, *drv; |
522 | uint8_t buf[2048]; | |
f500a6d3 | 523 | int ret = 0; |
f8ea0b00 | 524 | |
08a00559 | 525 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 526 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
527 | drv = bdrv_find_format("raw"); |
528 | if (!drv) { | |
529 | ret = -ENOENT; | |
530 | } | |
531 | *pdrv = drv; | |
532 | return ret; | |
1a396859 | 533 | } |
f8ea0b00 | 534 | |
83f64091 | 535 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 536 | if (ret < 0) { |
c98ac35d SW |
537 | *pdrv = NULL; |
538 | return ret; | |
83f64091 FB |
539 | } |
540 | ||
ea2384d3 | 541 | score_max = 0; |
84a12e66 | 542 | drv = NULL; |
8a22f02a | 543 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
544 | if (drv1->bdrv_probe) { |
545 | score = drv1->bdrv_probe(buf, ret, filename); | |
546 | if (score > score_max) { | |
547 | score_max = score; | |
548 | drv = drv1; | |
549 | } | |
0849bf08 | 550 | } |
fc01f7e7 | 551 | } |
c98ac35d SW |
552 | if (!drv) { |
553 | ret = -ENOENT; | |
554 | } | |
555 | *pdrv = drv; | |
556 | return ret; | |
ea2384d3 FB |
557 | } |
558 | ||
51762288 SH |
559 | /** |
560 | * Set the current 'total_sectors' value | |
561 | */ | |
562 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
563 | { | |
564 | BlockDriver *drv = bs->drv; | |
565 | ||
396759ad NB |
566 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
567 | if (bs->sg) | |
568 | return 0; | |
569 | ||
51762288 SH |
570 | /* query actual device if possible, otherwise just trust the hint */ |
571 | if (drv->bdrv_getlength) { | |
572 | int64_t length = drv->bdrv_getlength(bs); | |
573 | if (length < 0) { | |
574 | return length; | |
575 | } | |
576 | hint = length >> BDRV_SECTOR_BITS; | |
577 | } | |
578 | ||
579 | bs->total_sectors = hint; | |
580 | return 0; | |
581 | } | |
582 | ||
9e8f1835 PB |
583 | /** |
584 | * Set open flags for a given discard mode | |
585 | * | |
586 | * Return 0 on success, -1 if the discard mode was invalid. | |
587 | */ | |
588 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
589 | { | |
590 | *flags &= ~BDRV_O_UNMAP; | |
591 | ||
592 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
593 | /* do nothing */ | |
594 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
595 | *flags |= BDRV_O_UNMAP; | |
596 | } else { | |
597 | return -1; | |
598 | } | |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
c3993cdc SH |
603 | /** |
604 | * Set open flags for a given cache mode | |
605 | * | |
606 | * Return 0 on success, -1 if the cache mode was invalid. | |
607 | */ | |
608 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
609 | { | |
610 | *flags &= ~BDRV_O_CACHE_MASK; | |
611 | ||
612 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
613 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
614 | } else if (!strcmp(mode, "directsync")) { |
615 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
616 | } else if (!strcmp(mode, "writeback")) { |
617 | *flags |= BDRV_O_CACHE_WB; | |
618 | } else if (!strcmp(mode, "unsafe")) { | |
619 | *flags |= BDRV_O_CACHE_WB; | |
620 | *flags |= BDRV_O_NO_FLUSH; | |
621 | } else if (!strcmp(mode, "writethrough")) { | |
622 | /* this is the default */ | |
623 | } else { | |
624 | return -1; | |
625 | } | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
53fec9d3 SH |
630 | /** |
631 | * The copy-on-read flag is actually a reference count so multiple users may | |
632 | * use the feature without worrying about clobbering its previous state. | |
633 | * Copy-on-read stays enabled until all users have called to disable it. | |
634 | */ | |
635 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
636 | { | |
637 | bs->copy_on_read++; | |
638 | } | |
639 | ||
640 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
641 | { | |
642 | assert(bs->copy_on_read > 0); | |
643 | bs->copy_on_read--; | |
644 | } | |
645 | ||
7b272452 KW |
646 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
647 | { | |
648 | int open_flags = flags | BDRV_O_CACHE_WB; | |
649 | ||
650 | /* | |
651 | * Clear flags that are internal to the block layer before opening the | |
652 | * image. | |
653 | */ | |
654 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
655 | ||
656 | /* | |
657 | * Snapshots should be writable. | |
658 | */ | |
659 | if (bs->is_temporary) { | |
660 | open_flags |= BDRV_O_RDWR; | |
661 | } | |
662 | ||
663 | return open_flags; | |
664 | } | |
665 | ||
57915332 KW |
666 | /* |
667 | * Common part for opening disk images and files | |
b6ad491a KW |
668 | * |
669 | * Removes all processed options from *options. | |
57915332 | 670 | */ |
f500a6d3 | 671 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
b6ad491a | 672 | const char *filename, QDict *options, |
57915332 KW |
673 | int flags, BlockDriver *drv) |
674 | { | |
675 | int ret, open_flags; | |
676 | ||
677 | assert(drv != NULL); | |
6405875c | 678 | assert(bs->file == NULL); |
b6ad491a | 679 | assert(options == NULL || bs->options != options); |
57915332 | 680 | |
28dcee10 SH |
681 | trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
682 | ||
57915332 | 683 | bs->open_flags = flags; |
57915332 KW |
684 | bs->buffer_alignment = 512; |
685 | ||
53fec9d3 SH |
686 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
687 | if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) { | |
688 | bdrv_enable_copy_on_read(bs); | |
689 | } | |
690 | ||
57915332 KW |
691 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
692 | ||
693 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
694 | return -ENOTSUP; | |
695 | } | |
696 | ||
697 | bs->drv = drv; | |
7267c094 | 698 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 699 | |
03f541bd | 700 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
7b272452 | 701 | open_flags = bdrv_open_flags(bs, flags); |
57915332 | 702 | |
be028adc | 703 | bs->read_only = !(open_flags & BDRV_O_RDWR); |
e7c63796 | 704 | |
66f82cee KW |
705 | /* Open the image, either directly or using a protocol */ |
706 | if (drv->bdrv_file_open) { | |
f500a6d3 KW |
707 | if (file != NULL) { |
708 | bdrv_swap(file, bs); | |
709 | ret = 0; | |
710 | } else { | |
711 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
66f82cee | 712 | } |
f500a6d3 KW |
713 | } else { |
714 | assert(file != NULL); | |
715 | bs->file = file; | |
b6ad491a | 716 | ret = drv->bdrv_open(bs, options, open_flags); |
66f82cee KW |
717 | } |
718 | ||
57915332 KW |
719 | if (ret < 0) { |
720 | goto free_and_fail; | |
721 | } | |
722 | ||
51762288 SH |
723 | ret = refresh_total_sectors(bs, bs->total_sectors); |
724 | if (ret < 0) { | |
725 | goto free_and_fail; | |
57915332 | 726 | } |
51762288 | 727 | |
57915332 KW |
728 | #ifndef _WIN32 |
729 | if (bs->is_temporary) { | |
730 | unlink(filename); | |
731 | } | |
732 | #endif | |
733 | return 0; | |
734 | ||
735 | free_and_fail: | |
f500a6d3 | 736 | bs->file = NULL; |
7267c094 | 737 | g_free(bs->opaque); |
57915332 KW |
738 | bs->opaque = NULL; |
739 | bs->drv = NULL; | |
740 | return ret; | |
741 | } | |
742 | ||
b6ce07aa KW |
743 | /* |
744 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
745 | */ | |
83f64091 | 746 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 747 | { |
83f64091 | 748 | BlockDriverState *bs; |
6db95603 | 749 | BlockDriver *drv; |
83f64091 FB |
750 | int ret; |
751 | ||
b50cbabc | 752 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
753 | if (!drv) { |
754 | return -ENOENT; | |
755 | } | |
756 | ||
83f64091 | 757 | bs = bdrv_new(""); |
b6ad491a | 758 | ret = bdrv_open_common(bs, NULL, filename, NULL, flags, drv); |
83f64091 FB |
759 | if (ret < 0) { |
760 | bdrv_delete(bs); | |
761 | return ret; | |
3b0d4f61 | 762 | } |
71d0770c | 763 | bs->growable = 1; |
83f64091 FB |
764 | *pbs = bs; |
765 | return 0; | |
766 | } | |
767 | ||
9156df12 PB |
768 | int bdrv_open_backing_file(BlockDriverState *bs) |
769 | { | |
770 | char backing_filename[PATH_MAX]; | |
771 | int back_flags, ret; | |
772 | BlockDriver *back_drv = NULL; | |
773 | ||
774 | if (bs->backing_hd != NULL) { | |
775 | return 0; | |
776 | } | |
777 | ||
778 | bs->open_flags &= ~BDRV_O_NO_BACKING; | |
779 | if (bs->backing_file[0] == '\0') { | |
780 | return 0; | |
781 | } | |
782 | ||
783 | bs->backing_hd = bdrv_new(""); | |
784 | bdrv_get_full_backing_filename(bs, backing_filename, | |
785 | sizeof(backing_filename)); | |
786 | ||
787 | if (bs->backing_format[0] != '\0') { | |
788 | back_drv = bdrv_find_format(bs->backing_format); | |
789 | } | |
790 | ||
791 | /* backing files always opened read-only */ | |
792 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT); | |
793 | ||
de9c0cec KW |
794 | ret = bdrv_open(bs->backing_hd, backing_filename, NULL, |
795 | back_flags, back_drv); | |
9156df12 PB |
796 | if (ret < 0) { |
797 | bdrv_delete(bs->backing_hd); | |
798 | bs->backing_hd = NULL; | |
799 | bs->open_flags |= BDRV_O_NO_BACKING; | |
800 | return ret; | |
801 | } | |
802 | return 0; | |
803 | } | |
804 | ||
b6ce07aa KW |
805 | /* |
806 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
807 | * |
808 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
809 | * empty set of options. The reference to the QDict belongs to the block layer | |
810 | * after the call (even on failure), so if the caller intends to reuse the | |
811 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
b6ce07aa | 812 | */ |
de9c0cec KW |
813 | int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, |
814 | int flags, BlockDriver *drv) | |
ea2384d3 | 815 | { |
b6ce07aa | 816 | int ret; |
89c9bc3d SW |
817 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
818 | char tmp_filename[PATH_MAX + 1]; | |
f500a6d3 | 819 | BlockDriverState *file = NULL; |
712e7874 | 820 | |
de9c0cec KW |
821 | /* NULL means an empty set of options */ |
822 | if (options == NULL) { | |
823 | options = qdict_new(); | |
824 | } | |
825 | ||
826 | bs->options = options; | |
b6ad491a | 827 | options = qdict_clone_shallow(options); |
de9c0cec KW |
828 | |
829 | /* For snapshot=on, create a temporary qcow2 overlay */ | |
83f64091 | 830 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
831 | BlockDriverState *bs1; |
832 | int64_t total_size; | |
7c96d46e | 833 | int is_protocol = 0; |
91a073a9 KW |
834 | BlockDriver *bdrv_qcow2; |
835 | QEMUOptionParameter *options; | |
b6ce07aa | 836 | char backing_filename[PATH_MAX]; |
3b46e624 | 837 | |
ea2384d3 FB |
838 | /* if snapshot, we create a temporary backing file and open it |
839 | instead of opening 'filename' directly */ | |
33e3963e | 840 | |
ea2384d3 FB |
841 | /* if there is a backing file, use it */ |
842 | bs1 = bdrv_new(""); | |
de9c0cec | 843 | ret = bdrv_open(bs1, filename, NULL, 0, drv); |
51d7c00c | 844 | if (ret < 0) { |
ea2384d3 | 845 | bdrv_delete(bs1); |
de9c0cec | 846 | goto fail; |
ea2384d3 | 847 | } |
3e82990b | 848 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
849 | |
850 | if (bs1->drv && bs1->drv->protocol_name) | |
851 | is_protocol = 1; | |
852 | ||
ea2384d3 | 853 | bdrv_delete(bs1); |
3b46e624 | 854 | |
eba25057 JM |
855 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
856 | if (ret < 0) { | |
de9c0cec | 857 | goto fail; |
eba25057 | 858 | } |
7c96d46e AL |
859 | |
860 | /* Real path is meaningless for protocols */ | |
de9c0cec | 861 | if (is_protocol) { |
7c96d46e AL |
862 | snprintf(backing_filename, sizeof(backing_filename), |
863 | "%s", filename); | |
de9c0cec KW |
864 | } else if (!realpath(filename, backing_filename)) { |
865 | ret = -errno; | |
866 | goto fail; | |
867 | } | |
7c96d46e | 868 | |
91a073a9 KW |
869 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
870 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
871 | ||
3e82990b | 872 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
873 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
874 | if (drv) { | |
875 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
876 | drv->format_name); | |
877 | } | |
878 | ||
879 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 880 | free_option_parameters(options); |
51d7c00c | 881 | if (ret < 0) { |
de9c0cec | 882 | goto fail; |
ea2384d3 | 883 | } |
91a073a9 | 884 | |
ea2384d3 | 885 | filename = tmp_filename; |
91a073a9 | 886 | drv = bdrv_qcow2; |
ea2384d3 FB |
887 | bs->is_temporary = 1; |
888 | } | |
712e7874 | 889 | |
f500a6d3 KW |
890 | /* Open image file without format layer */ |
891 | if (flags & BDRV_O_RDWR) { | |
892 | flags |= BDRV_O_ALLOW_RDWR; | |
893 | } | |
894 | ||
895 | ret = bdrv_file_open(&file, filename, bdrv_open_flags(bs, flags)); | |
896 | if (ret < 0) { | |
de9c0cec | 897 | goto fail; |
f500a6d3 KW |
898 | } |
899 | ||
b6ce07aa | 900 | /* Find the right image format driver */ |
6db95603 | 901 | if (!drv) { |
f500a6d3 | 902 | ret = find_image_format(file, filename, &drv); |
51d7c00c | 903 | } |
6987307c | 904 | |
51d7c00c | 905 | if (!drv) { |
51d7c00c | 906 | goto unlink_and_fail; |
ea2384d3 | 907 | } |
b6ce07aa KW |
908 | |
909 | /* Open the image */ | |
b6ad491a | 910 | ret = bdrv_open_common(bs, file, filename, options, flags, drv); |
b6ce07aa | 911 | if (ret < 0) { |
6987307c CH |
912 | goto unlink_and_fail; |
913 | } | |
914 | ||
f500a6d3 KW |
915 | if (bs->file != file) { |
916 | bdrv_delete(file); | |
917 | file = NULL; | |
918 | } | |
919 | ||
b6ce07aa | 920 | /* If there is a backing file, use it */ |
9156df12 PB |
921 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
922 | ret = bdrv_open_backing_file(bs); | |
b6ce07aa | 923 | if (ret < 0) { |
b6ad491a | 924 | goto close_and_fail; |
b6ce07aa | 925 | } |
b6ce07aa KW |
926 | } |
927 | ||
b6ad491a KW |
928 | /* Check if any unknown options were used */ |
929 | if (qdict_size(options) != 0) { | |
930 | const QDictEntry *entry = qdict_first(options); | |
931 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Block format '%s' used by " | |
932 | "device '%s' doesn't support the option '%s'", | |
933 | drv->format_name, bs->device_name, entry->key); | |
934 | ||
935 | ret = -EINVAL; | |
936 | goto close_and_fail; | |
937 | } | |
938 | QDECREF(options); | |
939 | ||
b6ce07aa | 940 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 941 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
942 | } |
943 | ||
98f90dba ZYW |
944 | /* throttling disk I/O limits */ |
945 | if (bs->io_limits_enabled) { | |
946 | bdrv_io_limits_enable(bs); | |
947 | } | |
948 | ||
b6ce07aa KW |
949 | return 0; |
950 | ||
951 | unlink_and_fail: | |
f500a6d3 KW |
952 | if (file != NULL) { |
953 | bdrv_delete(file); | |
954 | } | |
b6ce07aa KW |
955 | if (bs->is_temporary) { |
956 | unlink(filename); | |
957 | } | |
de9c0cec KW |
958 | fail: |
959 | QDECREF(bs->options); | |
b6ad491a | 960 | QDECREF(options); |
de9c0cec | 961 | bs->options = NULL; |
b6ad491a | 962 | return ret; |
de9c0cec | 963 | |
b6ad491a KW |
964 | close_and_fail: |
965 | bdrv_close(bs); | |
966 | QDECREF(options); | |
b6ce07aa KW |
967 | return ret; |
968 | } | |
969 | ||
e971aa12 JC |
970 | typedef struct BlockReopenQueueEntry { |
971 | bool prepared; | |
972 | BDRVReopenState state; | |
973 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
974 | } BlockReopenQueueEntry; | |
975 | ||
976 | /* | |
977 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
978 | * reopen of multiple devices. | |
979 | * | |
980 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
981 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
982 | * be created and initialized. This newly created BlockReopenQueue should be | |
983 | * passed back in for subsequent calls that are intended to be of the same | |
984 | * atomic 'set'. | |
985 | * | |
986 | * bs is the BlockDriverState to add to the reopen queue. | |
987 | * | |
988 | * flags contains the open flags for the associated bs | |
989 | * | |
990 | * returns a pointer to bs_queue, which is either the newly allocated | |
991 | * bs_queue, or the existing bs_queue being used. | |
992 | * | |
993 | */ | |
994 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
995 | BlockDriverState *bs, int flags) | |
996 | { | |
997 | assert(bs != NULL); | |
998 | ||
999 | BlockReopenQueueEntry *bs_entry; | |
1000 | if (bs_queue == NULL) { | |
1001 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1002 | QSIMPLEQ_INIT(bs_queue); | |
1003 | } | |
1004 | ||
1005 | if (bs->file) { | |
1006 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
1007 | } | |
1008 | ||
1009 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1010 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1011 | ||
1012 | bs_entry->state.bs = bs; | |
1013 | bs_entry->state.flags = flags; | |
1014 | ||
1015 | return bs_queue; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1020 | * | |
1021 | * The queue passed in (bs_queue) must have been built up previous | |
1022 | * via bdrv_reopen_queue(). | |
1023 | * | |
1024 | * Reopens all BDS specified in the queue, with the appropriate | |
1025 | * flags. All devices are prepared for reopen, and failure of any | |
1026 | * device will cause all device changes to be abandonded, and intermediate | |
1027 | * data cleaned up. | |
1028 | * | |
1029 | * If all devices prepare successfully, then the changes are committed | |
1030 | * to all devices. | |
1031 | * | |
1032 | */ | |
1033 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1034 | { | |
1035 | int ret = -1; | |
1036 | BlockReopenQueueEntry *bs_entry, *next; | |
1037 | Error *local_err = NULL; | |
1038 | ||
1039 | assert(bs_queue != NULL); | |
1040 | ||
1041 | bdrv_drain_all(); | |
1042 | ||
1043 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1044 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1045 | error_propagate(errp, local_err); | |
1046 | goto cleanup; | |
1047 | } | |
1048 | bs_entry->prepared = true; | |
1049 | } | |
1050 | ||
1051 | /* If we reach this point, we have success and just need to apply the | |
1052 | * changes | |
1053 | */ | |
1054 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1055 | bdrv_reopen_commit(&bs_entry->state); | |
1056 | } | |
1057 | ||
1058 | ret = 0; | |
1059 | ||
1060 | cleanup: | |
1061 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1062 | if (ret && bs_entry->prepared) { | |
1063 | bdrv_reopen_abort(&bs_entry->state); | |
1064 | } | |
1065 | g_free(bs_entry); | |
1066 | } | |
1067 | g_free(bs_queue); | |
1068 | return ret; | |
1069 | } | |
1070 | ||
1071 | ||
1072 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1073 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1074 | { | |
1075 | int ret = -1; | |
1076 | Error *local_err = NULL; | |
1077 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1078 | ||
1079 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1080 | if (local_err != NULL) { | |
1081 | error_propagate(errp, local_err); | |
1082 | } | |
1083 | return ret; | |
1084 | } | |
1085 | ||
1086 | ||
1087 | /* | |
1088 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1089 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1090 | * the block driver layer .bdrv_reopen_prepare() | |
1091 | * | |
1092 | * bs is the BlockDriverState to reopen | |
1093 | * flags are the new open flags | |
1094 | * queue is the reopen queue | |
1095 | * | |
1096 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1097 | * as well. | |
1098 | * | |
1099 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1100 | * It is the responsibility of the caller to then call the abort() or | |
1101 | * commit() for any other BDS that have been left in a prepare() state | |
1102 | * | |
1103 | */ | |
1104 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1105 | Error **errp) | |
1106 | { | |
1107 | int ret = -1; | |
1108 | Error *local_err = NULL; | |
1109 | BlockDriver *drv; | |
1110 | ||
1111 | assert(reopen_state != NULL); | |
1112 | assert(reopen_state->bs->drv != NULL); | |
1113 | drv = reopen_state->bs->drv; | |
1114 | ||
1115 | /* if we are to stay read-only, do not allow permission change | |
1116 | * to r/w */ | |
1117 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1118 | reopen_state->flags & BDRV_O_RDWR) { | |
1119 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1120 | reopen_state->bs->device_name); | |
1121 | goto error; | |
1122 | } | |
1123 | ||
1124 | ||
1125 | ret = bdrv_flush(reopen_state->bs); | |
1126 | if (ret) { | |
1127 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1128 | strerror(-ret)); | |
1129 | goto error; | |
1130 | } | |
1131 | ||
1132 | if (drv->bdrv_reopen_prepare) { | |
1133 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1134 | if (ret) { | |
1135 | if (local_err != NULL) { | |
1136 | error_propagate(errp, local_err); | |
1137 | } else { | |
1138 | error_set(errp, QERR_OPEN_FILE_FAILED, | |
1139 | reopen_state->bs->filename); | |
1140 | } | |
1141 | goto error; | |
1142 | } | |
1143 | } else { | |
1144 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1145 | * handler for each supported drv. */ | |
1146 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1147 | drv->format_name, reopen_state->bs->device_name, | |
1148 | "reopening of file"); | |
1149 | ret = -1; | |
1150 | goto error; | |
1151 | } | |
1152 | ||
1153 | ret = 0; | |
1154 | ||
1155 | error: | |
1156 | return ret; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1161 | * makes them final by swapping the staging BlockDriverState contents into | |
1162 | * the active BlockDriverState contents. | |
1163 | */ | |
1164 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1165 | { | |
1166 | BlockDriver *drv; | |
1167 | ||
1168 | assert(reopen_state != NULL); | |
1169 | drv = reopen_state->bs->drv; | |
1170 | assert(drv != NULL); | |
1171 | ||
1172 | /* If there are any driver level actions to take */ | |
1173 | if (drv->bdrv_reopen_commit) { | |
1174 | drv->bdrv_reopen_commit(reopen_state); | |
1175 | } | |
1176 | ||
1177 | /* set BDS specific flags now */ | |
1178 | reopen_state->bs->open_flags = reopen_state->flags; | |
1179 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1180 | BDRV_O_CACHE_WB); | |
1181 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Abort the reopen, and delete and free the staged changes in | |
1186 | * reopen_state | |
1187 | */ | |
1188 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1189 | { | |
1190 | BlockDriver *drv; | |
1191 | ||
1192 | assert(reopen_state != NULL); | |
1193 | drv = reopen_state->bs->drv; | |
1194 | assert(drv != NULL); | |
1195 | ||
1196 | if (drv->bdrv_reopen_abort) { | |
1197 | drv->bdrv_reopen_abort(reopen_state); | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | ||
fc01f7e7 FB |
1202 | void bdrv_close(BlockDriverState *bs) |
1203 | { | |
80ccf93b | 1204 | bdrv_flush(bs); |
3cbc002c PB |
1205 | if (bs->job) { |
1206 | block_job_cancel_sync(bs->job); | |
1207 | } | |
1208 | bdrv_drain_all(); | |
d7d512f6 | 1209 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1210 | |
3cbc002c | 1211 | if (bs->drv) { |
f9092b10 MA |
1212 | if (bs == bs_snapshots) { |
1213 | bs_snapshots = NULL; | |
1214 | } | |
557df6ac | 1215 | if (bs->backing_hd) { |
ea2384d3 | 1216 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
1217 | bs->backing_hd = NULL; |
1218 | } | |
ea2384d3 | 1219 | bs->drv->bdrv_close(bs); |
7267c094 | 1220 | g_free(bs->opaque); |
ea2384d3 FB |
1221 | #ifdef _WIN32 |
1222 | if (bs->is_temporary) { | |
1223 | unlink(bs->filename); | |
1224 | } | |
67b915a5 | 1225 | #endif |
ea2384d3 FB |
1226 | bs->opaque = NULL; |
1227 | bs->drv = NULL; | |
53fec9d3 | 1228 | bs->copy_on_read = 0; |
a275fa42 PB |
1229 | bs->backing_file[0] = '\0'; |
1230 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1231 | bs->total_sectors = 0; |
1232 | bs->encrypted = 0; | |
1233 | bs->valid_key = 0; | |
1234 | bs->sg = 0; | |
1235 | bs->growable = 0; | |
de9c0cec KW |
1236 | QDECREF(bs->options); |
1237 | bs->options = NULL; | |
b338082b | 1238 | |
66f82cee | 1239 | if (bs->file != NULL) { |
0ac9377d PB |
1240 | bdrv_delete(bs->file); |
1241 | bs->file = NULL; | |
66f82cee | 1242 | } |
b338082b | 1243 | } |
98f90dba | 1244 | |
9ca11154 PH |
1245 | bdrv_dev_change_media_cb(bs, false); |
1246 | ||
98f90dba ZYW |
1247 | /*throttling disk I/O limits*/ |
1248 | if (bs->io_limits_enabled) { | |
1249 | bdrv_io_limits_disable(bs); | |
1250 | } | |
b338082b FB |
1251 | } |
1252 | ||
2bc93fed MK |
1253 | void bdrv_close_all(void) |
1254 | { | |
1255 | BlockDriverState *bs; | |
1256 | ||
1257 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1258 | bdrv_close(bs); | |
1259 | } | |
1260 | } | |
1261 | ||
922453bc SH |
1262 | /* |
1263 | * Wait for pending requests to complete across all BlockDriverStates | |
1264 | * | |
1265 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1266 | * after calling this function. | |
4c355d53 ZYW |
1267 | * |
1268 | * Note that completion of an asynchronous I/O operation can trigger any | |
1269 | * number of other I/O operations on other devices---for example a coroutine | |
1270 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1271 | * coroutine is complete. Because of this, it is not possible to have a | |
1272 | * function to drain a single device's I/O queue. | |
922453bc SH |
1273 | */ |
1274 | void bdrv_drain_all(void) | |
1275 | { | |
1276 | BlockDriverState *bs; | |
4c355d53 ZYW |
1277 | bool busy; |
1278 | ||
1279 | do { | |
1280 | busy = qemu_aio_wait(); | |
922453bc | 1281 | |
4c355d53 ZYW |
1282 | /* FIXME: We do not have timer support here, so this is effectively |
1283 | * a busy wait. | |
1284 | */ | |
1285 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1286 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
1287 | qemu_co_queue_restart_all(&bs->throttled_reqs); | |
1288 | busy = true; | |
1289 | } | |
1290 | } | |
1291 | } while (busy); | |
922453bc SH |
1292 | |
1293 | /* If requests are still pending there is a bug somewhere */ | |
1294 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1295 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
1296 | assert(qemu_co_queue_empty(&bs->throttled_reqs)); | |
1297 | } | |
1298 | } | |
1299 | ||
d22b2f41 RH |
1300 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
1301 | Also, NULL terminate the device_name to prevent double remove */ | |
1302 | void bdrv_make_anon(BlockDriverState *bs) | |
1303 | { | |
1304 | if (bs->device_name[0] != '\0') { | |
1305 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
1306 | } | |
1307 | bs->device_name[0] = '\0'; | |
1308 | } | |
1309 | ||
e023b2e2 PB |
1310 | static void bdrv_rebind(BlockDriverState *bs) |
1311 | { | |
1312 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1313 | bs->drv->bdrv_rebind(bs); | |
1314 | } | |
1315 | } | |
1316 | ||
4ddc07ca PB |
1317 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1318 | BlockDriverState *bs_src) | |
8802d1fd | 1319 | { |
4ddc07ca PB |
1320 | /* move some fields that need to stay attached to the device */ |
1321 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1322 | |
1323 | /* dev info */ | |
4ddc07ca PB |
1324 | bs_dest->dev_ops = bs_src->dev_ops; |
1325 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1326 | bs_dest->dev = bs_src->dev; | |
1327 | bs_dest->buffer_alignment = bs_src->buffer_alignment; | |
1328 | bs_dest->copy_on_read = bs_src->copy_on_read; | |
8802d1fd | 1329 | |
4ddc07ca | 1330 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1331 | |
8802d1fd | 1332 | /* i/o timing parameters */ |
4ddc07ca PB |
1333 | bs_dest->slice_time = bs_src->slice_time; |
1334 | bs_dest->slice_start = bs_src->slice_start; | |
1335 | bs_dest->slice_end = bs_src->slice_end; | |
1336 | bs_dest->io_limits = bs_src->io_limits; | |
1337 | bs_dest->io_base = bs_src->io_base; | |
1338 | bs_dest->throttled_reqs = bs_src->throttled_reqs; | |
1339 | bs_dest->block_timer = bs_src->block_timer; | |
1340 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; | |
8802d1fd | 1341 | |
8802d1fd | 1342 | /* r/w error */ |
4ddc07ca PB |
1343 | bs_dest->on_read_error = bs_src->on_read_error; |
1344 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1345 | |
1346 | /* i/o status */ | |
4ddc07ca PB |
1347 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1348 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1349 | |
a9fc4408 | 1350 | /* dirty bitmap */ |
4ddc07ca | 1351 | bs_dest->dirty_bitmap = bs_src->dirty_bitmap; |
a9fc4408 PB |
1352 | |
1353 | /* job */ | |
4ddc07ca PB |
1354 | bs_dest->in_use = bs_src->in_use; |
1355 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1356 | |
8802d1fd | 1357 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1358 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1359 | bs_src->device_name); | |
1360 | bs_dest->list = bs_src->list; | |
1361 | } | |
8802d1fd | 1362 | |
4ddc07ca PB |
1363 | /* |
1364 | * Swap bs contents for two image chains while they are live, | |
1365 | * while keeping required fields on the BlockDriverState that is | |
1366 | * actually attached to a device. | |
1367 | * | |
1368 | * This will modify the BlockDriverState fields, and swap contents | |
1369 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1370 | * | |
1371 | * bs_new is required to be anonymous. | |
1372 | * | |
1373 | * This function does not create any image files. | |
1374 | */ | |
1375 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1376 | { | |
1377 | BlockDriverState tmp; | |
f6801b83 | 1378 | |
4ddc07ca PB |
1379 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1380 | assert(bs_new->device_name[0] == '\0'); | |
1381 | assert(bs_new->dirty_bitmap == NULL); | |
1382 | assert(bs_new->job == NULL); | |
1383 | assert(bs_new->dev == NULL); | |
1384 | assert(bs_new->in_use == 0); | |
1385 | assert(bs_new->io_limits_enabled == false); | |
1386 | assert(bs_new->block_timer == NULL); | |
8802d1fd | 1387 | |
4ddc07ca PB |
1388 | tmp = *bs_new; |
1389 | *bs_new = *bs_old; | |
1390 | *bs_old = tmp; | |
a9fc4408 | 1391 | |
4ddc07ca PB |
1392 | /* there are some fields that should not be swapped, move them back */ |
1393 | bdrv_move_feature_fields(&tmp, bs_old); | |
1394 | bdrv_move_feature_fields(bs_old, bs_new); | |
1395 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1396 | |
4ddc07ca PB |
1397 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1398 | assert(bs_new->device_name[0] == '\0'); | |
1399 | ||
1400 | /* Check a few fields that should remain attached to the device */ | |
1401 | assert(bs_new->dev == NULL); | |
1402 | assert(bs_new->job == NULL); | |
1403 | assert(bs_new->in_use == 0); | |
1404 | assert(bs_new->io_limits_enabled == false); | |
1405 | assert(bs_new->block_timer == NULL); | |
e023b2e2 PB |
1406 | |
1407 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1408 | bdrv_rebind(bs_old); |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * Add new bs contents at the top of an image chain while the chain is | |
1413 | * live, while keeping required fields on the top layer. | |
1414 | * | |
1415 | * This will modify the BlockDriverState fields, and swap contents | |
1416 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1417 | * | |
1418 | * bs_new is required to be anonymous. | |
1419 | * | |
1420 | * This function does not create any image files. | |
1421 | */ | |
1422 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1423 | { | |
1424 | bdrv_swap(bs_new, bs_top); | |
1425 | ||
1426 | /* The contents of 'tmp' will become bs_top, as we are | |
1427 | * swapping bs_new and bs_top contents. */ | |
1428 | bs_top->backing_hd = bs_new; | |
1429 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1430 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1431 | bs_new->filename); | |
1432 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1433 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1434 | } |
1435 | ||
b338082b FB |
1436 | void bdrv_delete(BlockDriverState *bs) |
1437 | { | |
fa879d62 | 1438 | assert(!bs->dev); |
3e914655 PB |
1439 | assert(!bs->job); |
1440 | assert(!bs->in_use); | |
18846dee | 1441 | |
1b7bdbc1 | 1442 | /* remove from list, if necessary */ |
d22b2f41 | 1443 | bdrv_make_anon(bs); |
34c6f050 | 1444 | |
b338082b | 1445 | bdrv_close(bs); |
66f82cee | 1446 | |
f9092b10 | 1447 | assert(bs != bs_snapshots); |
7267c094 | 1448 | g_free(bs); |
fc01f7e7 FB |
1449 | } |
1450 | ||
fa879d62 MA |
1451 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1452 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1453 | { |
fa879d62 | 1454 | if (bs->dev) { |
18846dee MA |
1455 | return -EBUSY; |
1456 | } | |
fa879d62 | 1457 | bs->dev = dev; |
28a7282a | 1458 | bdrv_iostatus_reset(bs); |
18846dee MA |
1459 | return 0; |
1460 | } | |
1461 | ||
fa879d62 MA |
1462 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1463 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1464 | { |
fa879d62 MA |
1465 | if (bdrv_attach_dev(bs, dev) < 0) { |
1466 | abort(); | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1471 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1472 | { | |
1473 | assert(bs->dev == dev); | |
1474 | bs->dev = NULL; | |
0e49de52 MA |
1475 | bs->dev_ops = NULL; |
1476 | bs->dev_opaque = NULL; | |
29e05f20 | 1477 | bs->buffer_alignment = 512; |
18846dee MA |
1478 | } |
1479 | ||
fa879d62 MA |
1480 | /* TODO change to return DeviceState * when all users are qdevified */ |
1481 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1482 | { |
fa879d62 | 1483 | return bs->dev; |
18846dee MA |
1484 | } |
1485 | ||
0e49de52 MA |
1486 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1487 | void *opaque) | |
1488 | { | |
1489 | bs->dev_ops = ops; | |
1490 | bs->dev_opaque = opaque; | |
2c6942fa MA |
1491 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
1492 | bs_snapshots = NULL; | |
1493 | } | |
0e49de52 MA |
1494 | } |
1495 | ||
32c81a4a PB |
1496 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1497 | enum MonitorEvent ev, | |
1498 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
1499 | { |
1500 | QObject *data; | |
1501 | const char *action_str; | |
1502 | ||
1503 | switch (action) { | |
1504 | case BDRV_ACTION_REPORT: | |
1505 | action_str = "report"; | |
1506 | break; | |
1507 | case BDRV_ACTION_IGNORE: | |
1508 | action_str = "ignore"; | |
1509 | break; | |
1510 | case BDRV_ACTION_STOP: | |
1511 | action_str = "stop"; | |
1512 | break; | |
1513 | default: | |
1514 | abort(); | |
1515 | } | |
1516 | ||
1517 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1518 | bdrv->device_name, | |
1519 | action_str, | |
1520 | is_read ? "read" : "write"); | |
32c81a4a | 1521 | monitor_protocol_event(ev, data); |
329c0a48 LC |
1522 | |
1523 | qobject_decref(data); | |
1524 | } | |
1525 | ||
6f382ed2 LC |
1526 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1527 | { | |
1528 | QObject *data; | |
1529 | ||
1530 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1531 | bdrv_get_device_name(bs), ejected); | |
1532 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1533 | ||
1534 | qobject_decref(data); | |
1535 | } | |
1536 | ||
7d4b4ba5 | 1537 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1538 | { |
145feb17 | 1539 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1540 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1541 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1542 | if (tray_was_closed) { |
1543 | /* tray open */ | |
1544 | bdrv_emit_qmp_eject_event(bs, true); | |
1545 | } | |
1546 | if (load) { | |
1547 | /* tray close */ | |
1548 | bdrv_emit_qmp_eject_event(bs, false); | |
1549 | } | |
145feb17 MA |
1550 | } |
1551 | } | |
1552 | ||
2c6942fa MA |
1553 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1554 | { | |
1555 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1556 | } | |
1557 | ||
025ccaa7 PB |
1558 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1559 | { | |
1560 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1561 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1562 | } | |
1563 | } | |
1564 | ||
e4def80b MA |
1565 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1566 | { | |
1567 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1568 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1569 | } | |
1570 | return false; | |
1571 | } | |
1572 | ||
145feb17 MA |
1573 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1574 | { | |
1575 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1576 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1577 | } |
1578 | } | |
1579 | ||
f107639a MA |
1580 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1581 | { | |
1582 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1583 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1584 | } | |
1585 | return false; | |
1586 | } | |
1587 | ||
e97fc193 AL |
1588 | /* |
1589 | * Run consistency checks on an image | |
1590 | * | |
e076f338 | 1591 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1592 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1593 | * check are stored in res. |
e97fc193 | 1594 | */ |
4534ff54 | 1595 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1596 | { |
1597 | if (bs->drv->bdrv_check == NULL) { | |
1598 | return -ENOTSUP; | |
1599 | } | |
1600 | ||
e076f338 | 1601 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1602 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1603 | } |
1604 | ||
8a426614 KW |
1605 | #define COMMIT_BUF_SECTORS 2048 |
1606 | ||
33e3963e FB |
1607 | /* commit COW file into the raw image */ |
1608 | int bdrv_commit(BlockDriverState *bs) | |
1609 | { | |
19cb3738 | 1610 | BlockDriver *drv = bs->drv; |
8a426614 KW |
1611 | int64_t sector, total_sectors; |
1612 | int n, ro, open_flags; | |
0bce597d | 1613 | int ret = 0; |
8a426614 | 1614 | uint8_t *buf; |
c2cba3d9 | 1615 | char filename[PATH_MAX]; |
33e3963e | 1616 | |
19cb3738 FB |
1617 | if (!drv) |
1618 | return -ENOMEDIUM; | |
4dca4b63 NS |
1619 | |
1620 | if (!bs->backing_hd) { | |
1621 | return -ENOTSUP; | |
33e3963e FB |
1622 | } |
1623 | ||
2d3735d3 SH |
1624 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1625 | return -EBUSY; | |
1626 | } | |
1627 | ||
4dca4b63 | 1628 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
1629 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
1630 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
1631 | open_flags = bs->backing_hd->open_flags; |
1632 | ||
1633 | if (ro) { | |
0bce597d JC |
1634 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
1635 | return -EACCES; | |
4dca4b63 | 1636 | } |
ea2384d3 | 1637 | } |
33e3963e | 1638 | |
6ea44308 | 1639 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1640 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1641 | |
1642 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1643 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1644 | |
1645 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1646 | ret = -EIO; | |
1647 | goto ro_cleanup; | |
1648 | } | |
1649 | ||
1650 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1651 | ret = -EIO; | |
1652 | goto ro_cleanup; | |
1653 | } | |
ea2384d3 | 1654 | } |
33e3963e | 1655 | } |
95389c86 | 1656 | |
1d44952f CH |
1657 | if (drv->bdrv_make_empty) { |
1658 | ret = drv->bdrv_make_empty(bs); | |
1659 | bdrv_flush(bs); | |
1660 | } | |
95389c86 | 1661 | |
3f5075ae CH |
1662 | /* |
1663 | * Make sure all data we wrote to the backing device is actually | |
1664 | * stable on disk. | |
1665 | */ | |
1666 | if (bs->backing_hd) | |
1667 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1668 | |
1669 | ro_cleanup: | |
7267c094 | 1670 | g_free(buf); |
4dca4b63 NS |
1671 | |
1672 | if (ro) { | |
0bce597d JC |
1673 | /* ignoring error return here */ |
1674 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
1675 | } |
1676 | ||
1d44952f | 1677 | return ret; |
33e3963e FB |
1678 | } |
1679 | ||
e8877497 | 1680 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1681 | { |
1682 | BlockDriverState *bs; | |
1683 | ||
1684 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
272d2d8e JC |
1685 | if (bs->drv && bs->backing_hd) { |
1686 | int ret = bdrv_commit(bs); | |
1687 | if (ret < 0) { | |
1688 | return ret; | |
1689 | } | |
e8877497 | 1690 | } |
6ab4b5ab | 1691 | } |
e8877497 | 1692 | return 0; |
6ab4b5ab MA |
1693 | } |
1694 | ||
dbffbdcf SH |
1695 | struct BdrvTrackedRequest { |
1696 | BlockDriverState *bs; | |
1697 | int64_t sector_num; | |
1698 | int nb_sectors; | |
1699 | bool is_write; | |
1700 | QLIST_ENTRY(BdrvTrackedRequest) list; | |
5f8b6491 | 1701 | Coroutine *co; /* owner, used for deadlock detection */ |
f4658285 | 1702 | CoQueue wait_queue; /* coroutines blocked on this request */ |
dbffbdcf SH |
1703 | }; |
1704 | ||
1705 | /** | |
1706 | * Remove an active request from the tracked requests list | |
1707 | * | |
1708 | * This function should be called when a tracked request is completing. | |
1709 | */ | |
1710 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1711 | { | |
1712 | QLIST_REMOVE(req, list); | |
f4658285 | 1713 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1714 | } |
1715 | ||
1716 | /** | |
1717 | * Add an active request to the tracked requests list | |
1718 | */ | |
1719 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1720 | BlockDriverState *bs, | |
1721 | int64_t sector_num, | |
1722 | int nb_sectors, bool is_write) | |
1723 | { | |
1724 | *req = (BdrvTrackedRequest){ | |
1725 | .bs = bs, | |
1726 | .sector_num = sector_num, | |
1727 | .nb_sectors = nb_sectors, | |
1728 | .is_write = is_write, | |
5f8b6491 | 1729 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1730 | }; |
1731 | ||
f4658285 SH |
1732 | qemu_co_queue_init(&req->wait_queue); |
1733 | ||
dbffbdcf SH |
1734 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1735 | } | |
1736 | ||
d83947ac SH |
1737 | /** |
1738 | * Round a region to cluster boundaries | |
1739 | */ | |
343bded4 PB |
1740 | void bdrv_round_to_clusters(BlockDriverState *bs, |
1741 | int64_t sector_num, int nb_sectors, | |
1742 | int64_t *cluster_sector_num, | |
1743 | int *cluster_nb_sectors) | |
d83947ac SH |
1744 | { |
1745 | BlockDriverInfo bdi; | |
1746 | ||
1747 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1748 | *cluster_sector_num = sector_num; | |
1749 | *cluster_nb_sectors = nb_sectors; | |
1750 | } else { | |
1751 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1752 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1753 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1754 | nb_sectors, c); | |
1755 | } | |
1756 | } | |
1757 | ||
f4658285 SH |
1758 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1759 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1760 | /* aaaa bbbb */ |
1761 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1762 | return false; | |
1763 | } | |
1764 | /* bbbb aaaa */ | |
1765 | if (req->sector_num >= sector_num + nb_sectors) { | |
1766 | return false; | |
1767 | } | |
1768 | return true; | |
f4658285 SH |
1769 | } |
1770 | ||
1771 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1772 | int64_t sector_num, int nb_sectors) | |
1773 | { | |
1774 | BdrvTrackedRequest *req; | |
d83947ac SH |
1775 | int64_t cluster_sector_num; |
1776 | int cluster_nb_sectors; | |
f4658285 SH |
1777 | bool retry; |
1778 | ||
d83947ac SH |
1779 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1780 | * that allocating writes will be serialized and not race with each other | |
1781 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1782 | * CoR read and write operations are atomic and guest writes cannot | |
1783 | * interleave between them. | |
1784 | */ | |
343bded4 PB |
1785 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
1786 | &cluster_sector_num, &cluster_nb_sectors); | |
d83947ac | 1787 | |
f4658285 SH |
1788 | do { |
1789 | retry = false; | |
1790 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1791 | if (tracked_request_overlaps(req, cluster_sector_num, |
1792 | cluster_nb_sectors)) { | |
5f8b6491 SH |
1793 | /* Hitting this means there was a reentrant request, for |
1794 | * example, a block driver issuing nested requests. This must | |
1795 | * never happen since it means deadlock. | |
1796 | */ | |
1797 | assert(qemu_coroutine_self() != req->co); | |
1798 | ||
f4658285 SH |
1799 | qemu_co_queue_wait(&req->wait_queue); |
1800 | retry = true; | |
1801 | break; | |
1802 | } | |
1803 | } | |
1804 | } while (retry); | |
1805 | } | |
1806 | ||
756e6736 KW |
1807 | /* |
1808 | * Return values: | |
1809 | * 0 - success | |
1810 | * -EINVAL - backing format specified, but no file | |
1811 | * -ENOSPC - can't update the backing file because no space is left in the | |
1812 | * image file header | |
1813 | * -ENOTSUP - format driver doesn't support changing the backing file | |
1814 | */ | |
1815 | int bdrv_change_backing_file(BlockDriverState *bs, | |
1816 | const char *backing_file, const char *backing_fmt) | |
1817 | { | |
1818 | BlockDriver *drv = bs->drv; | |
469ef350 | 1819 | int ret; |
756e6736 | 1820 | |
5f377794 PB |
1821 | /* Backing file format doesn't make sense without a backing file */ |
1822 | if (backing_fmt && !backing_file) { | |
1823 | return -EINVAL; | |
1824 | } | |
1825 | ||
756e6736 | 1826 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 1827 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 1828 | } else { |
469ef350 | 1829 | ret = -ENOTSUP; |
756e6736 | 1830 | } |
469ef350 PB |
1831 | |
1832 | if (ret == 0) { | |
1833 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
1834 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1835 | } | |
1836 | return ret; | |
756e6736 KW |
1837 | } |
1838 | ||
6ebdcee2 JC |
1839 | /* |
1840 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
1841 | * | |
1842 | * active is the current topmost image. | |
1843 | * | |
1844 | * Returns NULL if bs is not found in active's image chain, | |
1845 | * or if active == bs. | |
1846 | */ | |
1847 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
1848 | BlockDriverState *bs) | |
1849 | { | |
1850 | BlockDriverState *overlay = NULL; | |
1851 | BlockDriverState *intermediate; | |
1852 | ||
1853 | assert(active != NULL); | |
1854 | assert(bs != NULL); | |
1855 | ||
1856 | /* if bs is the same as active, then by definition it has no overlay | |
1857 | */ | |
1858 | if (active == bs) { | |
1859 | return NULL; | |
1860 | } | |
1861 | ||
1862 | intermediate = active; | |
1863 | while (intermediate->backing_hd) { | |
1864 | if (intermediate->backing_hd == bs) { | |
1865 | overlay = intermediate; | |
1866 | break; | |
1867 | } | |
1868 | intermediate = intermediate->backing_hd; | |
1869 | } | |
1870 | ||
1871 | return overlay; | |
1872 | } | |
1873 | ||
1874 | typedef struct BlkIntermediateStates { | |
1875 | BlockDriverState *bs; | |
1876 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
1877 | } BlkIntermediateStates; | |
1878 | ||
1879 | ||
1880 | /* | |
1881 | * Drops images above 'base' up to and including 'top', and sets the image | |
1882 | * above 'top' to have base as its backing file. | |
1883 | * | |
1884 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
1885 | * information in 'bs' can be properly updated. | |
1886 | * | |
1887 | * E.g., this will convert the following chain: | |
1888 | * bottom <- base <- intermediate <- top <- active | |
1889 | * | |
1890 | * to | |
1891 | * | |
1892 | * bottom <- base <- active | |
1893 | * | |
1894 | * It is allowed for bottom==base, in which case it converts: | |
1895 | * | |
1896 | * base <- intermediate <- top <- active | |
1897 | * | |
1898 | * to | |
1899 | * | |
1900 | * base <- active | |
1901 | * | |
1902 | * Error conditions: | |
1903 | * if active == top, that is considered an error | |
1904 | * | |
1905 | */ | |
1906 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
1907 | BlockDriverState *base) | |
1908 | { | |
1909 | BlockDriverState *intermediate; | |
1910 | BlockDriverState *base_bs = NULL; | |
1911 | BlockDriverState *new_top_bs = NULL; | |
1912 | BlkIntermediateStates *intermediate_state, *next; | |
1913 | int ret = -EIO; | |
1914 | ||
1915 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
1916 | QSIMPLEQ_INIT(&states_to_delete); | |
1917 | ||
1918 | if (!top->drv || !base->drv) { | |
1919 | goto exit; | |
1920 | } | |
1921 | ||
1922 | new_top_bs = bdrv_find_overlay(active, top); | |
1923 | ||
1924 | if (new_top_bs == NULL) { | |
1925 | /* we could not find the image above 'top', this is an error */ | |
1926 | goto exit; | |
1927 | } | |
1928 | ||
1929 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
1930 | * to do, no intermediate images */ | |
1931 | if (new_top_bs->backing_hd == base) { | |
1932 | ret = 0; | |
1933 | goto exit; | |
1934 | } | |
1935 | ||
1936 | intermediate = top; | |
1937 | ||
1938 | /* now we will go down through the list, and add each BDS we find | |
1939 | * into our deletion queue, until we hit the 'base' | |
1940 | */ | |
1941 | while (intermediate) { | |
1942 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
1943 | intermediate_state->bs = intermediate; | |
1944 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
1945 | ||
1946 | if (intermediate->backing_hd == base) { | |
1947 | base_bs = intermediate->backing_hd; | |
1948 | break; | |
1949 | } | |
1950 | intermediate = intermediate->backing_hd; | |
1951 | } | |
1952 | if (base_bs == NULL) { | |
1953 | /* something went wrong, we did not end at the base. safely | |
1954 | * unravel everything, and exit with error */ | |
1955 | goto exit; | |
1956 | } | |
1957 | ||
1958 | /* success - we can delete the intermediate states, and link top->base */ | |
1959 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
1960 | base_bs->drv ? base_bs->drv->format_name : ""); | |
1961 | if (ret) { | |
1962 | goto exit; | |
1963 | } | |
1964 | new_top_bs->backing_hd = base_bs; | |
1965 | ||
1966 | ||
1967 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
1968 | /* so that bdrv_close() does not recursively close the chain */ | |
1969 | intermediate_state->bs->backing_hd = NULL; | |
1970 | bdrv_delete(intermediate_state->bs); | |
1971 | } | |
1972 | ret = 0; | |
1973 | ||
1974 | exit: | |
1975 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
1976 | g_free(intermediate_state); | |
1977 | } | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1981 | ||
71d0770c AL |
1982 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1983 | size_t size) | |
1984 | { | |
1985 | int64_t len; | |
1986 | ||
1987 | if (!bdrv_is_inserted(bs)) | |
1988 | return -ENOMEDIUM; | |
1989 | ||
1990 | if (bs->growable) | |
1991 | return 0; | |
1992 | ||
1993 | len = bdrv_getlength(bs); | |
1994 | ||
fbb7b4e0 KW |
1995 | if (offset < 0) |
1996 | return -EIO; | |
1997 | ||
1998 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
1999 | return -EIO; |
2000 | ||
2001 | return 0; | |
2002 | } | |
2003 | ||
2004 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2005 | int nb_sectors) | |
2006 | { | |
eb5a3165 JS |
2007 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2008 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2009 | } |
2010 | ||
1c9805a3 SH |
2011 | typedef struct RwCo { |
2012 | BlockDriverState *bs; | |
2013 | int64_t sector_num; | |
2014 | int nb_sectors; | |
2015 | QEMUIOVector *qiov; | |
2016 | bool is_write; | |
2017 | int ret; | |
2018 | } RwCo; | |
2019 | ||
2020 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2021 | { |
1c9805a3 | 2022 | RwCo *rwco = opaque; |
ea2384d3 | 2023 | |
1c9805a3 SH |
2024 | if (!rwco->is_write) { |
2025 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
470c0504 | 2026 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
2027 | } else { |
2028 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
f08f2dda | 2029 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
2030 | } |
2031 | } | |
e7a8a783 | 2032 | |
1c9805a3 SH |
2033 | /* |
2034 | * Process a synchronous request using coroutines | |
2035 | */ | |
2036 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
2037 | int nb_sectors, bool is_write) | |
2038 | { | |
2039 | QEMUIOVector qiov; | |
2040 | struct iovec iov = { | |
2041 | .iov_base = (void *)buf, | |
2042 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2043 | }; | |
2044 | Coroutine *co; | |
2045 | RwCo rwco = { | |
2046 | .bs = bs, | |
2047 | .sector_num = sector_num, | |
2048 | .nb_sectors = nb_sectors, | |
2049 | .qiov = &qiov, | |
2050 | .is_write = is_write, | |
2051 | .ret = NOT_DONE, | |
2052 | }; | |
e7a8a783 | 2053 | |
1c9805a3 | 2054 | qemu_iovec_init_external(&qiov, &iov, 1); |
e7a8a783 | 2055 | |
498e386c ZYW |
2056 | /** |
2057 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2058 | * will not fire; so the I/O throttling function has to be disabled here | |
2059 | * if it has been enabled. | |
2060 | */ | |
2061 | if (bs->io_limits_enabled) { | |
2062 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2063 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2064 | bdrv_io_limits_disable(bs); | |
2065 | } | |
2066 | ||
1c9805a3 SH |
2067 | if (qemu_in_coroutine()) { |
2068 | /* Fast-path if already in coroutine context */ | |
2069 | bdrv_rw_co_entry(&rwco); | |
2070 | } else { | |
2071 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2072 | qemu_coroutine_enter(co, &rwco); | |
2073 | while (rwco.ret == NOT_DONE) { | |
2074 | qemu_aio_wait(); | |
2075 | } | |
2076 | } | |
2077 | return rwco.ret; | |
2078 | } | |
b338082b | 2079 | |
1c9805a3 SH |
2080 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2081 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2082 | uint8_t *buf, int nb_sectors) | |
2083 | { | |
2084 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
fc01f7e7 FB |
2085 | } |
2086 | ||
07d27a44 MA |
2087 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2088 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2089 | uint8_t *buf, int nb_sectors) | |
2090 | { | |
2091 | bool enabled; | |
2092 | int ret; | |
2093 | ||
2094 | enabled = bs->io_limits_enabled; | |
2095 | bs->io_limits_enabled = false; | |
2096 | ret = bdrv_read(bs, 0, buf, 1); | |
2097 | bs->io_limits_enabled = enabled; | |
2098 | return ret; | |
2099 | } | |
2100 | ||
5fafdf24 | 2101 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2102 | -EIO generic I/O error (may happen for all errors) |
2103 | -ENOMEDIUM No media inserted. | |
2104 | -EINVAL Invalid sector number or nb_sectors | |
2105 | -EACCES Trying to write a read-only device | |
2106 | */ | |
5fafdf24 | 2107 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2108 | const uint8_t *buf, int nb_sectors) |
2109 | { | |
1c9805a3 | 2110 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
83f64091 FB |
2111 | } |
2112 | ||
eda578e5 AL |
2113 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
2114 | void *buf, int count1) | |
83f64091 | 2115 | { |
6ea44308 | 2116 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2117 | int len, nb_sectors, count; |
2118 | int64_t sector_num; | |
9a8c4cce | 2119 | int ret; |
83f64091 FB |
2120 | |
2121 | count = count1; | |
2122 | /* first read to align to sector start */ | |
6ea44308 | 2123 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2124 | if (len > count) |
2125 | len = count; | |
6ea44308 | 2126 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2127 | if (len > 0) { |
9a8c4cce KW |
2128 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2129 | return ret; | |
6ea44308 | 2130 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
2131 | count -= len; |
2132 | if (count == 0) | |
2133 | return count1; | |
2134 | sector_num++; | |
2135 | buf += len; | |
2136 | } | |
2137 | ||
2138 | /* read the sectors "in place" */ | |
6ea44308 | 2139 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2140 | if (nb_sectors > 0) { |
9a8c4cce KW |
2141 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
2142 | return ret; | |
83f64091 | 2143 | sector_num += nb_sectors; |
6ea44308 | 2144 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2145 | buf += len; |
2146 | count -= len; | |
2147 | } | |
2148 | ||
2149 | /* add data from the last sector */ | |
2150 | if (count > 0) { | |
9a8c4cce KW |
2151 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2152 | return ret; | |
83f64091 FB |
2153 | memcpy(buf, tmp_buf, count); |
2154 | } | |
2155 | return count1; | |
2156 | } | |
2157 | ||
eda578e5 AL |
2158 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
2159 | const void *buf, int count1) | |
83f64091 | 2160 | { |
6ea44308 | 2161 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2162 | int len, nb_sectors, count; |
2163 | int64_t sector_num; | |
9a8c4cce | 2164 | int ret; |
83f64091 FB |
2165 | |
2166 | count = count1; | |
2167 | /* first write to align to sector start */ | |
6ea44308 | 2168 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2169 | if (len > count) |
2170 | len = count; | |
6ea44308 | 2171 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2172 | if (len > 0) { |
9a8c4cce KW |
2173 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2174 | return ret; | |
6ea44308 | 2175 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
2176 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2177 | return ret; | |
83f64091 FB |
2178 | count -= len; |
2179 | if (count == 0) | |
2180 | return count1; | |
2181 | sector_num++; | |
2182 | buf += len; | |
2183 | } | |
2184 | ||
2185 | /* write the sectors "in place" */ | |
6ea44308 | 2186 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2187 | if (nb_sectors > 0) { |
9a8c4cce KW |
2188 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
2189 | return ret; | |
83f64091 | 2190 | sector_num += nb_sectors; |
6ea44308 | 2191 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2192 | buf += len; |
2193 | count -= len; | |
2194 | } | |
2195 | ||
2196 | /* add data from the last sector */ | |
2197 | if (count > 0) { | |
9a8c4cce KW |
2198 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2199 | return ret; | |
83f64091 | 2200 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
2201 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2202 | return ret; | |
83f64091 FB |
2203 | } |
2204 | return count1; | |
2205 | } | |
83f64091 | 2206 | |
f08145fe KW |
2207 | /* |
2208 | * Writes to the file and ensures that no writes are reordered across this | |
2209 | * request (acts as a barrier) | |
2210 | * | |
2211 | * Returns 0 on success, -errno in error cases. | |
2212 | */ | |
2213 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2214 | const void *buf, int count) | |
2215 | { | |
2216 | int ret; | |
2217 | ||
2218 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2219 | if (ret < 0) { | |
2220 | return ret; | |
2221 | } | |
2222 | ||
f05fa4ad PB |
2223 | /* No flush needed for cache modes that already do it */ |
2224 | if (bs->enable_write_cache) { | |
f08145fe KW |
2225 | bdrv_flush(bs); |
2226 | } | |
2227 | ||
2228 | return 0; | |
2229 | } | |
2230 | ||
470c0504 | 2231 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2232 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2233 | { | |
2234 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2235 | * their read buffer while the operation is in progress do not end up | |
2236 | * modifying the image file. This is critical for zero-copy guest I/O | |
2237 | * where anything might happen inside guest memory. | |
2238 | */ | |
2239 | void *bounce_buffer; | |
2240 | ||
79c053bd | 2241 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2242 | struct iovec iov; |
2243 | QEMUIOVector bounce_qiov; | |
2244 | int64_t cluster_sector_num; | |
2245 | int cluster_nb_sectors; | |
2246 | size_t skip_bytes; | |
2247 | int ret; | |
2248 | ||
2249 | /* Cover entire cluster so no additional backing file I/O is required when | |
2250 | * allocating cluster in the image file. | |
2251 | */ | |
343bded4 PB |
2252 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2253 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2254 | |
470c0504 SH |
2255 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2256 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2257 | |
2258 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2259 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2260 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2261 | ||
79c053bd SH |
2262 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2263 | &bounce_qiov); | |
ab185921 SH |
2264 | if (ret < 0) { |
2265 | goto err; | |
2266 | } | |
2267 | ||
79c053bd SH |
2268 | if (drv->bdrv_co_write_zeroes && |
2269 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
2270 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
2271 | cluster_nb_sectors); | |
79c053bd | 2272 | } else { |
f05fa4ad PB |
2273 | /* This does not change the data on the disk, it is not necessary |
2274 | * to flush even in cache=writethrough mode. | |
2275 | */ | |
79c053bd | 2276 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2277 | &bounce_qiov); |
79c053bd SH |
2278 | } |
2279 | ||
ab185921 SH |
2280 | if (ret < 0) { |
2281 | /* It might be okay to ignore write errors for guest requests. If this | |
2282 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2283 | * Simply report it in all cases. | |
2284 | */ | |
2285 | goto err; | |
2286 | } | |
2287 | ||
2288 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2289 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2290 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2291 | |
2292 | err: | |
2293 | qemu_vfree(bounce_buffer); | |
2294 | return ret; | |
2295 | } | |
2296 | ||
c5fbe571 SH |
2297 | /* |
2298 | * Handle a read request in coroutine context | |
2299 | */ | |
2300 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
2301 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2302 | BdrvRequestFlags flags) | |
da1fa91d KW |
2303 | { |
2304 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
2305 | BdrvTrackedRequest req; |
2306 | int ret; | |
da1fa91d | 2307 | |
da1fa91d KW |
2308 | if (!drv) { |
2309 | return -ENOMEDIUM; | |
2310 | } | |
2311 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2312 | return -EIO; | |
2313 | } | |
2314 | ||
98f90dba ZYW |
2315 | /* throttling disk read I/O */ |
2316 | if (bs->io_limits_enabled) { | |
2317 | bdrv_io_limits_intercept(bs, false, nb_sectors); | |
2318 | } | |
2319 | ||
f4658285 | 2320 | if (bs->copy_on_read) { |
470c0504 SH |
2321 | flags |= BDRV_REQ_COPY_ON_READ; |
2322 | } | |
2323 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2324 | bs->copy_on_read_in_flight++; | |
2325 | } | |
2326 | ||
2327 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
2328 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2329 | } | |
2330 | ||
dbffbdcf | 2331 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 2332 | |
470c0504 | 2333 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2334 | int pnum; |
2335 | ||
2336 | ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); | |
2337 | if (ret < 0) { | |
2338 | goto out; | |
2339 | } | |
2340 | ||
2341 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2342 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2343 | goto out; |
2344 | } | |
2345 | } | |
2346 | ||
dbffbdcf | 2347 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2348 | |
2349 | out: | |
dbffbdcf | 2350 | tracked_request_end(&req); |
470c0504 SH |
2351 | |
2352 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2353 | bs->copy_on_read_in_flight--; | |
2354 | } | |
2355 | ||
dbffbdcf | 2356 | return ret; |
da1fa91d KW |
2357 | } |
2358 | ||
c5fbe571 | 2359 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
2360 | int nb_sectors, QEMUIOVector *qiov) |
2361 | { | |
c5fbe571 | 2362 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 2363 | |
470c0504 SH |
2364 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
2365 | } | |
2366 | ||
2367 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
2368 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
2369 | { | |
2370 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
2371 | ||
2372 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
2373 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
2374 | } |
2375 | ||
f08f2dda SH |
2376 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
2377 | int64_t sector_num, int nb_sectors) | |
2378 | { | |
2379 | BlockDriver *drv = bs->drv; | |
2380 | QEMUIOVector qiov; | |
2381 | struct iovec iov; | |
2382 | int ret; | |
2383 | ||
621f0589 KW |
2384 | /* TODO Emulate only part of misaligned requests instead of letting block |
2385 | * drivers return -ENOTSUP and emulate everything */ | |
2386 | ||
f08f2dda SH |
2387 | /* First try the efficient write zeroes operation */ |
2388 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
2389 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
2390 | if (ret != -ENOTSUP) { | |
2391 | return ret; | |
2392 | } | |
f08f2dda SH |
2393 | } |
2394 | ||
2395 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
2396 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2397 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
2398 | memset(iov.iov_base, 0, iov.iov_len); | |
2399 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2400 | ||
2401 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
2402 | ||
2403 | qemu_vfree(iov.iov_base); | |
2404 | return ret; | |
2405 | } | |
2406 | ||
c5fbe571 SH |
2407 | /* |
2408 | * Handle a write request in coroutine context | |
2409 | */ | |
2410 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
2411 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2412 | BdrvRequestFlags flags) | |
c5fbe571 SH |
2413 | { |
2414 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 2415 | BdrvTrackedRequest req; |
6b7cb247 | 2416 | int ret; |
da1fa91d KW |
2417 | |
2418 | if (!bs->drv) { | |
2419 | return -ENOMEDIUM; | |
2420 | } | |
2421 | if (bs->read_only) { | |
2422 | return -EACCES; | |
2423 | } | |
2424 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2425 | return -EIO; | |
2426 | } | |
2427 | ||
98f90dba ZYW |
2428 | /* throttling disk write I/O */ |
2429 | if (bs->io_limits_enabled) { | |
2430 | bdrv_io_limits_intercept(bs, true, nb_sectors); | |
2431 | } | |
2432 | ||
470c0504 | 2433 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
2434 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2435 | } | |
2436 | ||
dbffbdcf SH |
2437 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
2438 | ||
f08f2dda SH |
2439 | if (flags & BDRV_REQ_ZERO_WRITE) { |
2440 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); | |
2441 | } else { | |
2442 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
2443 | } | |
6b7cb247 | 2444 | |
f05fa4ad PB |
2445 | if (ret == 0 && !bs->enable_write_cache) { |
2446 | ret = bdrv_co_flush(bs); | |
2447 | } | |
2448 | ||
da1fa91d | 2449 | if (bs->dirty_bitmap) { |
1755da16 | 2450 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
2451 | } |
2452 | ||
2453 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2454 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2455 | } | |
2456 | ||
dbffbdcf SH |
2457 | tracked_request_end(&req); |
2458 | ||
6b7cb247 | 2459 | return ret; |
da1fa91d KW |
2460 | } |
2461 | ||
c5fbe571 SH |
2462 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2463 | int nb_sectors, QEMUIOVector *qiov) | |
2464 | { | |
2465 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2466 | ||
f08f2dda SH |
2467 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
2468 | } | |
2469 | ||
2470 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
2471 | int64_t sector_num, int nb_sectors) | |
2472 | { | |
2473 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
2474 | ||
2475 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
2476 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
2477 | } |
2478 | ||
83f64091 FB |
2479 | /** |
2480 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2481 | */ | |
2482 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2483 | { | |
2484 | BlockDriver *drv = bs->drv; | |
51762288 | 2485 | int ret; |
83f64091 | 2486 | if (!drv) |
19cb3738 | 2487 | return -ENOMEDIUM; |
83f64091 FB |
2488 | if (!drv->bdrv_truncate) |
2489 | return -ENOTSUP; | |
59f2689d NS |
2490 | if (bs->read_only) |
2491 | return -EACCES; | |
8591675f MT |
2492 | if (bdrv_in_use(bs)) |
2493 | return -EBUSY; | |
9a665b2b PL |
2494 | |
2495 | /* There better not be any in-flight IOs when we truncate the device. */ | |
2496 | bdrv_drain_all(); | |
2497 | ||
51762288 SH |
2498 | ret = drv->bdrv_truncate(bs, offset); |
2499 | if (ret == 0) { | |
2500 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2501 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2502 | } |
2503 | return ret; | |
83f64091 FB |
2504 | } |
2505 | ||
4a1d5e1f FZ |
2506 | /** |
2507 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2508 | * allocated space. Return < 0 if error or unknown. | |
2509 | */ | |
2510 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2511 | { | |
2512 | BlockDriver *drv = bs->drv; | |
2513 | if (!drv) { | |
2514 | return -ENOMEDIUM; | |
2515 | } | |
2516 | if (drv->bdrv_get_allocated_file_size) { | |
2517 | return drv->bdrv_get_allocated_file_size(bs); | |
2518 | } | |
2519 | if (bs->file) { | |
2520 | return bdrv_get_allocated_file_size(bs->file); | |
2521 | } | |
2522 | return -ENOTSUP; | |
2523 | } | |
2524 | ||
83f64091 FB |
2525 | /** |
2526 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2527 | */ | |
2528 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2529 | { | |
2530 | BlockDriver *drv = bs->drv; | |
2531 | if (!drv) | |
19cb3738 | 2532 | return -ENOMEDIUM; |
51762288 | 2533 | |
2c6942fa | 2534 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2535 | if (drv->bdrv_getlength) { |
2536 | return drv->bdrv_getlength(bs); | |
2537 | } | |
83f64091 | 2538 | } |
46a4e4e6 | 2539 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2540 | } |
2541 | ||
19cb3738 | 2542 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2543 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2544 | { |
19cb3738 FB |
2545 | int64_t length; |
2546 | length = bdrv_getlength(bs); | |
2547 | if (length < 0) | |
2548 | length = 0; | |
2549 | else | |
6ea44308 | 2550 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2551 | *nb_sectors_ptr = length; |
fc01f7e7 | 2552 | } |
cf98951b | 2553 | |
0563e191 ZYW |
2554 | /* throttling disk io limits */ |
2555 | void bdrv_set_io_limits(BlockDriverState *bs, | |
2556 | BlockIOLimit *io_limits) | |
2557 | { | |
2558 | bs->io_limits = *io_limits; | |
2559 | bs->io_limits_enabled = bdrv_io_limits_enabled(bs); | |
2560 | } | |
2561 | ||
ff06f5f3 PB |
2562 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
2563 | BlockdevOnError on_write_error) | |
abd7f68d MA |
2564 | { |
2565 | bs->on_read_error = on_read_error; | |
2566 | bs->on_write_error = on_write_error; | |
2567 | } | |
2568 | ||
1ceee0d5 | 2569 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
2570 | { |
2571 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2572 | } | |
2573 | ||
3e1caa5f PB |
2574 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
2575 | { | |
2576 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
2577 | ||
2578 | switch (on_err) { | |
2579 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2580 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
2581 | case BLOCKDEV_ON_ERROR_STOP: | |
2582 | return BDRV_ACTION_STOP; | |
2583 | case BLOCKDEV_ON_ERROR_REPORT: | |
2584 | return BDRV_ACTION_REPORT; | |
2585 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2586 | return BDRV_ACTION_IGNORE; | |
2587 | default: | |
2588 | abort(); | |
2589 | } | |
2590 | } | |
2591 | ||
2592 | /* This is done by device models because, while the block layer knows | |
2593 | * about the error, it does not know whether an operation comes from | |
2594 | * the device or the block layer (from a job, for example). | |
2595 | */ | |
2596 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
2597 | bool is_read, int error) | |
2598 | { | |
2599 | assert(error >= 0); | |
32c81a4a | 2600 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
2601 | if (action == BDRV_ACTION_STOP) { |
2602 | vm_stop(RUN_STATE_IO_ERROR); | |
2603 | bdrv_iostatus_set_err(bs, error); | |
2604 | } | |
2605 | } | |
2606 | ||
b338082b FB |
2607 | int bdrv_is_read_only(BlockDriverState *bs) |
2608 | { | |
2609 | return bs->read_only; | |
2610 | } | |
2611 | ||
985a03b0 TS |
2612 | int bdrv_is_sg(BlockDriverState *bs) |
2613 | { | |
2614 | return bs->sg; | |
2615 | } | |
2616 | ||
e900a7b7 CH |
2617 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2618 | { | |
2619 | return bs->enable_write_cache; | |
2620 | } | |
2621 | ||
425b0148 PB |
2622 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
2623 | { | |
2624 | bs->enable_write_cache = wce; | |
55b110f2 JC |
2625 | |
2626 | /* so a reopen() will preserve wce */ | |
2627 | if (wce) { | |
2628 | bs->open_flags |= BDRV_O_CACHE_WB; | |
2629 | } else { | |
2630 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
2631 | } | |
425b0148 PB |
2632 | } |
2633 | ||
ea2384d3 FB |
2634 | int bdrv_is_encrypted(BlockDriverState *bs) |
2635 | { | |
2636 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2637 | return 1; | |
2638 | return bs->encrypted; | |
2639 | } | |
2640 | ||
c0f4ce77 AL |
2641 | int bdrv_key_required(BlockDriverState *bs) |
2642 | { | |
2643 | BlockDriverState *backing_hd = bs->backing_hd; | |
2644 | ||
2645 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2646 | return 1; | |
2647 | return (bs->encrypted && !bs->valid_key); | |
2648 | } | |
2649 | ||
ea2384d3 FB |
2650 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2651 | { | |
2652 | int ret; | |
2653 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2654 | ret = bdrv_set_key(bs->backing_hd, key); | |
2655 | if (ret < 0) | |
2656 | return ret; | |
2657 | if (!bs->encrypted) | |
2658 | return 0; | |
2659 | } | |
fd04a2ae SH |
2660 | if (!bs->encrypted) { |
2661 | return -EINVAL; | |
2662 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2663 | return -ENOMEDIUM; | |
2664 | } | |
c0f4ce77 | 2665 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2666 | if (ret < 0) { |
2667 | bs->valid_key = 0; | |
2668 | } else if (!bs->valid_key) { | |
2669 | bs->valid_key = 1; | |
2670 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2671 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2672 | } |
c0f4ce77 | 2673 | return ret; |
ea2384d3 FB |
2674 | } |
2675 | ||
f8d6bba1 | 2676 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 2677 | { |
f8d6bba1 | 2678 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
2679 | } |
2680 | ||
5fafdf24 | 2681 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2682 | void *opaque) |
2683 | { | |
2684 | BlockDriver *drv; | |
2685 | ||
8a22f02a | 2686 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2687 | it(opaque, drv->format_name); |
2688 | } | |
2689 | } | |
2690 | ||
b338082b FB |
2691 | BlockDriverState *bdrv_find(const char *name) |
2692 | { | |
2693 | BlockDriverState *bs; | |
2694 | ||
1b7bdbc1 SH |
2695 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2696 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2697 | return bs; |
1b7bdbc1 | 2698 | } |
b338082b FB |
2699 | } |
2700 | return NULL; | |
2701 | } | |
2702 | ||
2f399b0a MA |
2703 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2704 | { | |
2705 | if (!bs) { | |
2706 | return QTAILQ_FIRST(&bdrv_states); | |
2707 | } | |
2708 | return QTAILQ_NEXT(bs, list); | |
2709 | } | |
2710 | ||
51de9760 | 2711 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2712 | { |
2713 | BlockDriverState *bs; | |
2714 | ||
1b7bdbc1 | 2715 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2716 | it(opaque, bs); |
81d0912d FB |
2717 | } |
2718 | } | |
2719 | ||
ea2384d3 FB |
2720 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2721 | { | |
2722 | return bs->device_name; | |
2723 | } | |
2724 | ||
c8433287 MA |
2725 | int bdrv_get_flags(BlockDriverState *bs) |
2726 | { | |
2727 | return bs->open_flags; | |
2728 | } | |
2729 | ||
c6ca28d6 AL |
2730 | void bdrv_flush_all(void) |
2731 | { | |
2732 | BlockDriverState *bs; | |
2733 | ||
1b7bdbc1 | 2734 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
29cdb251 | 2735 | bdrv_flush(bs); |
1b7bdbc1 | 2736 | } |
c6ca28d6 AL |
2737 | } |
2738 | ||
f2feebbd KW |
2739 | int bdrv_has_zero_init(BlockDriverState *bs) |
2740 | { | |
2741 | assert(bs->drv); | |
2742 | ||
336c1c12 KW |
2743 | if (bs->drv->bdrv_has_zero_init) { |
2744 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
2745 | } |
2746 | ||
2747 | return 1; | |
2748 | } | |
2749 | ||
376ae3f1 SH |
2750 | typedef struct BdrvCoIsAllocatedData { |
2751 | BlockDriverState *bs; | |
b35b2bba | 2752 | BlockDriverState *base; |
376ae3f1 SH |
2753 | int64_t sector_num; |
2754 | int nb_sectors; | |
2755 | int *pnum; | |
2756 | int ret; | |
2757 | bool done; | |
2758 | } BdrvCoIsAllocatedData; | |
2759 | ||
f58c7b35 TS |
2760 | /* |
2761 | * Returns true iff the specified sector is present in the disk image. Drivers | |
2762 | * not implementing the functionality are assumed to not support backing files, | |
2763 | * hence all their sectors are reported as allocated. | |
2764 | * | |
bd9533e3 SH |
2765 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
2766 | * and 'pnum' is set to 0. | |
2767 | * | |
f58c7b35 TS |
2768 | * 'pnum' is set to the number of sectors (including and immediately following |
2769 | * the specified sector) that are known to be in the same | |
2770 | * allocated/unallocated state. | |
2771 | * | |
bd9533e3 SH |
2772 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
2773 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 2774 | */ |
060f51c9 SH |
2775 | int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
2776 | int nb_sectors, int *pnum) | |
f58c7b35 | 2777 | { |
bd9533e3 SH |
2778 | int64_t n; |
2779 | ||
2780 | if (sector_num >= bs->total_sectors) { | |
2781 | *pnum = 0; | |
2782 | return 0; | |
2783 | } | |
2784 | ||
2785 | n = bs->total_sectors - sector_num; | |
2786 | if (n < nb_sectors) { | |
2787 | nb_sectors = n; | |
2788 | } | |
2789 | ||
6aebab14 | 2790 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 2791 | *pnum = nb_sectors; |
f58c7b35 TS |
2792 | return 1; |
2793 | } | |
6aebab14 | 2794 | |
060f51c9 SH |
2795 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
2796 | } | |
2797 | ||
2798 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
2799 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
2800 | { | |
2801 | BdrvCoIsAllocatedData *data = opaque; | |
2802 | BlockDriverState *bs = data->bs; | |
2803 | ||
2804 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
2805 | data->pnum); | |
2806 | data->done = true; | |
2807 | } | |
2808 | ||
2809 | /* | |
2810 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
2811 | * | |
2812 | * See bdrv_co_is_allocated() for details. | |
2813 | */ | |
2814 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
2815 | int *pnum) | |
2816 | { | |
6aebab14 SH |
2817 | Coroutine *co; |
2818 | BdrvCoIsAllocatedData data = { | |
2819 | .bs = bs, | |
2820 | .sector_num = sector_num, | |
2821 | .nb_sectors = nb_sectors, | |
2822 | .pnum = pnum, | |
2823 | .done = false, | |
2824 | }; | |
2825 | ||
2826 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
2827 | qemu_coroutine_enter(co, &data); | |
2828 | while (!data.done) { | |
2829 | qemu_aio_wait(); | |
2830 | } | |
2831 | return data.ret; | |
f58c7b35 TS |
2832 | } |
2833 | ||
188a7bbf PB |
2834 | /* |
2835 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
2836 | * | |
2837 | * Return true if the given sector is allocated in any image between | |
2838 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
2839 | * sector is allocated in any image of the chain. Return false otherwise. | |
2840 | * | |
2841 | * 'pnum' is set to the number of sectors (including and immediately following | |
2842 | * the specified sector) that are known to be in the same | |
2843 | * allocated/unallocated state. | |
2844 | * | |
2845 | */ | |
2846 | int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, | |
2847 | BlockDriverState *base, | |
2848 | int64_t sector_num, | |
2849 | int nb_sectors, int *pnum) | |
2850 | { | |
2851 | BlockDriverState *intermediate; | |
2852 | int ret, n = nb_sectors; | |
2853 | ||
2854 | intermediate = top; | |
2855 | while (intermediate && intermediate != base) { | |
2856 | int pnum_inter; | |
2857 | ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors, | |
2858 | &pnum_inter); | |
2859 | if (ret < 0) { | |
2860 | return ret; | |
2861 | } else if (ret) { | |
2862 | *pnum = pnum_inter; | |
2863 | return 1; | |
2864 | } | |
2865 | ||
2866 | /* | |
2867 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
2868 | * might have | |
2869 | * | |
2870 | * [sector_num+x, nr_sectors] allocated. | |
2871 | */ | |
63ba17d3 VI |
2872 | if (n > pnum_inter && |
2873 | (intermediate == top || | |
2874 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
2875 | n = pnum_inter; |
2876 | } | |
2877 | ||
2878 | intermediate = intermediate->backing_hd; | |
2879 | } | |
2880 | ||
2881 | *pnum = n; | |
2882 | return 0; | |
2883 | } | |
2884 | ||
b35b2bba MR |
2885 | /* Coroutine wrapper for bdrv_is_allocated_above() */ |
2886 | static void coroutine_fn bdrv_is_allocated_above_co_entry(void *opaque) | |
2887 | { | |
2888 | BdrvCoIsAllocatedData *data = opaque; | |
2889 | BlockDriverState *top = data->bs; | |
2890 | BlockDriverState *base = data->base; | |
2891 | ||
2892 | data->ret = bdrv_co_is_allocated_above(top, base, data->sector_num, | |
2893 | data->nb_sectors, data->pnum); | |
2894 | data->done = true; | |
2895 | } | |
2896 | ||
2897 | /* | |
2898 | * Synchronous wrapper around bdrv_co_is_allocated_above(). | |
2899 | * | |
2900 | * See bdrv_co_is_allocated_above() for details. | |
2901 | */ | |
2902 | int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, | |
2903 | int64_t sector_num, int nb_sectors, int *pnum) | |
2904 | { | |
2905 | Coroutine *co; | |
2906 | BdrvCoIsAllocatedData data = { | |
2907 | .bs = top, | |
2908 | .base = base, | |
2909 | .sector_num = sector_num, | |
2910 | .nb_sectors = nb_sectors, | |
2911 | .pnum = pnum, | |
2912 | .done = false, | |
2913 | }; | |
2914 | ||
2915 | co = qemu_coroutine_create(bdrv_is_allocated_above_co_entry); | |
2916 | qemu_coroutine_enter(co, &data); | |
2917 | while (!data.done) { | |
2918 | qemu_aio_wait(); | |
2919 | } | |
2920 | return data.ret; | |
2921 | } | |
2922 | ||
ac84adac | 2923 | BlockInfo *bdrv_query_info(BlockDriverState *bs) |
b338082b | 2924 | { |
ac84adac PB |
2925 | BlockInfo *info = g_malloc0(sizeof(*info)); |
2926 | info->device = g_strdup(bs->device_name); | |
2927 | info->type = g_strdup("unknown"); | |
2928 | info->locked = bdrv_dev_is_medium_locked(bs); | |
2929 | info->removable = bdrv_dev_has_removable_media(bs); | |
b338082b | 2930 | |
ac84adac PB |
2931 | if (bdrv_dev_has_removable_media(bs)) { |
2932 | info->has_tray_open = true; | |
2933 | info->tray_open = bdrv_dev_is_tray_open(bs); | |
2934 | } | |
d15e5465 | 2935 | |
ac84adac PB |
2936 | if (bdrv_iostatus_is_enabled(bs)) { |
2937 | info->has_io_status = true; | |
2938 | info->io_status = bs->iostatus; | |
2939 | } | |
d15e5465 | 2940 | |
b9a9b3a4 PB |
2941 | if (bs->dirty_bitmap) { |
2942 | info->has_dirty = true; | |
2943 | info->dirty = g_malloc0(sizeof(*info->dirty)); | |
acc906c6 | 2944 | info->dirty->count = bdrv_get_dirty_count(bs) * BDRV_SECTOR_SIZE; |
50717e94 PB |
2945 | info->dirty->granularity = |
2946 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bs->dirty_bitmap)); | |
b9a9b3a4 | 2947 | } |
d15e5465 | 2948 | |
ac84adac PB |
2949 | if (bs->drv) { |
2950 | info->has_inserted = true; | |
2951 | info->inserted = g_malloc0(sizeof(*info->inserted)); | |
2952 | info->inserted->file = g_strdup(bs->filename); | |
2953 | info->inserted->ro = bs->read_only; | |
2954 | info->inserted->drv = g_strdup(bs->drv->format_name); | |
2955 | info->inserted->encrypted = bs->encrypted; | |
2956 | info->inserted->encryption_key_missing = bdrv_key_required(bs); | |
2957 | ||
2958 | if (bs->backing_file[0]) { | |
2959 | info->inserted->has_backing_file = true; | |
2960 | info->inserted->backing_file = g_strdup(bs->backing_file); | |
e4def80b | 2961 | } |
f04ef601 | 2962 | |
ac84adac PB |
2963 | info->inserted->backing_file_depth = bdrv_get_backing_file_depth(bs); |
2964 | ||
2965 | if (bs->io_limits_enabled) { | |
2966 | info->inserted->bps = | |
2967 | bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
2968 | info->inserted->bps_rd = | |
2969 | bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; | |
2970 | info->inserted->bps_wr = | |
2971 | bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; | |
2972 | info->inserted->iops = | |
2973 | bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
2974 | info->inserted->iops_rd = | |
2975 | bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; | |
2976 | info->inserted->iops_wr = | |
2977 | bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; | |
f04ef601 | 2978 | } |
ac84adac PB |
2979 | } |
2980 | return info; | |
2981 | } | |
f04ef601 | 2982 | |
ac84adac PB |
2983 | BlockInfoList *qmp_query_block(Error **errp) |
2984 | { | |
2985 | BlockInfoList *head = NULL, **p_next = &head; | |
2986 | BlockDriverState *bs; | |
727f005e | 2987 | |
ac84adac PB |
2988 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2989 | BlockInfoList *info = g_malloc0(sizeof(*info)); | |
2990 | info->value = bdrv_query_info(bs); | |
d15e5465 | 2991 | |
ac84adac PB |
2992 | *p_next = info; |
2993 | p_next = &info->next; | |
b338082b | 2994 | } |
d15e5465 | 2995 | |
b2023818 | 2996 | return head; |
b338082b | 2997 | } |
a36e69dd | 2998 | |
9887b616 | 2999 | BlockStats *bdrv_query_stats(const BlockDriverState *bs) |
f11f57e4 LC |
3000 | { |
3001 | BlockStats *s; | |
3002 | ||
3003 | s = g_malloc0(sizeof(*s)); | |
3004 | ||
3005 | if (bs->device_name[0]) { | |
3006 | s->has_device = true; | |
3007 | s->device = g_strdup(bs->device_name); | |
294cc35f KW |
3008 | } |
3009 | ||
f11f57e4 LC |
3010 | s->stats = g_malloc0(sizeof(*s->stats)); |
3011 | s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; | |
3012 | s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; | |
3013 | s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; | |
3014 | s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; | |
3015 | s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; | |
3016 | s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; | |
3017 | s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; | |
3018 | s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; | |
3019 | s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; | |
3020 | ||
294cc35f | 3021 | if (bs->file) { |
f11f57e4 | 3022 | s->has_parent = true; |
9887b616 | 3023 | s->parent = bdrv_query_stats(bs->file); |
294cc35f KW |
3024 | } |
3025 | ||
f11f57e4 | 3026 | return s; |
294cc35f KW |
3027 | } |
3028 | ||
f11f57e4 | 3029 | BlockStatsList *qmp_query_blockstats(Error **errp) |
218a536a | 3030 | { |
9887b616 | 3031 | BlockStatsList *head = NULL, **p_next = &head; |
a36e69dd TS |
3032 | BlockDriverState *bs; |
3033 | ||
1b7bdbc1 | 3034 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f11f57e4 | 3035 | BlockStatsList *info = g_malloc0(sizeof(*info)); |
9887b616 | 3036 | info->value = bdrv_query_stats(bs); |
f11f57e4 | 3037 | |
9887b616 PB |
3038 | *p_next = info; |
3039 | p_next = &info->next; | |
a36e69dd | 3040 | } |
218a536a | 3041 | |
f11f57e4 | 3042 | return head; |
a36e69dd | 3043 | } |
ea2384d3 | 3044 | |
045df330 AL |
3045 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
3046 | { | |
3047 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3048 | return bs->backing_file; | |
3049 | else if (bs->encrypted) | |
3050 | return bs->filename; | |
3051 | else | |
3052 | return NULL; | |
3053 | } | |
3054 | ||
5fafdf24 | 3055 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
3056 | char *filename, int filename_size) |
3057 | { | |
3574c608 | 3058 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
3059 | } |
3060 | ||
5fafdf24 | 3061 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
3062 | const uint8_t *buf, int nb_sectors) |
3063 | { | |
3064 | BlockDriver *drv = bs->drv; | |
3065 | if (!drv) | |
19cb3738 | 3066 | return -ENOMEDIUM; |
faea38e7 FB |
3067 | if (!drv->bdrv_write_compressed) |
3068 | return -ENOTSUP; | |
fbb7b4e0 KW |
3069 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
3070 | return -EIO; | |
a55eb92c | 3071 | |
1755da16 | 3072 | assert(!bs->dirty_bitmap); |
a55eb92c | 3073 | |
faea38e7 FB |
3074 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
3075 | } | |
3b46e624 | 3076 | |
faea38e7 FB |
3077 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3078 | { | |
3079 | BlockDriver *drv = bs->drv; | |
3080 | if (!drv) | |
19cb3738 | 3081 | return -ENOMEDIUM; |
faea38e7 FB |
3082 | if (!drv->bdrv_get_info) |
3083 | return -ENOTSUP; | |
3084 | memset(bdi, 0, sizeof(*bdi)); | |
3085 | return drv->bdrv_get_info(bs, bdi); | |
3086 | } | |
3087 | ||
45566e9c CH |
3088 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3089 | int64_t pos, int size) | |
178e08a5 AL |
3090 | { |
3091 | BlockDriver *drv = bs->drv; | |
3092 | if (!drv) | |
3093 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3094 | if (drv->bdrv_save_vmstate) |
3095 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
3096 | if (bs->file) | |
3097 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
3098 | return -ENOTSUP; | |
178e08a5 AL |
3099 | } |
3100 | ||
45566e9c CH |
3101 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
3102 | int64_t pos, int size) | |
178e08a5 AL |
3103 | { |
3104 | BlockDriver *drv = bs->drv; | |
3105 | if (!drv) | |
3106 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3107 | if (drv->bdrv_load_vmstate) |
3108 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
3109 | if (bs->file) | |
3110 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
3111 | return -ENOTSUP; | |
178e08a5 AL |
3112 | } |
3113 | ||
8b9b0cc2 KW |
3114 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
3115 | { | |
3116 | BlockDriver *drv = bs->drv; | |
3117 | ||
3118 | if (!drv || !drv->bdrv_debug_event) { | |
3119 | return; | |
3120 | } | |
3121 | ||
0ed8b6f6 | 3122 | drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
3123 | } |
3124 | ||
3125 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
3126 | const char *tag) | |
3127 | { | |
3128 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
3129 | bs = bs->file; | |
3130 | } | |
3131 | ||
3132 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
3133 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3134 | } | |
3135 | ||
3136 | return -ENOTSUP; | |
3137 | } | |
3138 | ||
3139 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) | |
3140 | { | |
3141 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
3142 | bs = bs->file; | |
3143 | } | |
8b9b0cc2 | 3144 | |
41c695c7 KW |
3145 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3146 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3147 | } | |
3148 | ||
3149 | return -ENOTSUP; | |
3150 | } | |
3151 | ||
3152 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
3153 | { | |
3154 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
3155 | bs = bs->file; | |
3156 | } | |
3157 | ||
3158 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
3159 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3160 | } | |
3161 | ||
3162 | return false; | |
8b9b0cc2 KW |
3163 | } |
3164 | ||
faea38e7 FB |
3165 | /**************************************************************/ |
3166 | /* handling of snapshots */ | |
3167 | ||
feeee5ac MDCF |
3168 | int bdrv_can_snapshot(BlockDriverState *bs) |
3169 | { | |
3170 | BlockDriver *drv = bs->drv; | |
07b70bfb | 3171 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
feeee5ac MDCF |
3172 | return 0; |
3173 | } | |
3174 | ||
3175 | if (!drv->bdrv_snapshot_create) { | |
3176 | if (bs->file != NULL) { | |
3177 | return bdrv_can_snapshot(bs->file); | |
3178 | } | |
3179 | return 0; | |
3180 | } | |
3181 | ||
3182 | return 1; | |
3183 | } | |
3184 | ||
199630b6 BS |
3185 | int bdrv_is_snapshot(BlockDriverState *bs) |
3186 | { | |
3187 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
3188 | } | |
3189 | ||
f9092b10 MA |
3190 | BlockDriverState *bdrv_snapshots(void) |
3191 | { | |
3192 | BlockDriverState *bs; | |
3193 | ||
3ac906f7 | 3194 | if (bs_snapshots) { |
f9092b10 | 3195 | return bs_snapshots; |
3ac906f7 | 3196 | } |
f9092b10 MA |
3197 | |
3198 | bs = NULL; | |
3199 | while ((bs = bdrv_next(bs))) { | |
3200 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
3201 | bs_snapshots = bs; |
3202 | return bs; | |
f9092b10 MA |
3203 | } |
3204 | } | |
3205 | return NULL; | |
f9092b10 MA |
3206 | } |
3207 | ||
5fafdf24 | 3208 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
3209 | QEMUSnapshotInfo *sn_info) |
3210 | { | |
3211 | BlockDriver *drv = bs->drv; | |
3212 | if (!drv) | |
19cb3738 | 3213 | return -ENOMEDIUM; |
7cdb1f6d MK |
3214 | if (drv->bdrv_snapshot_create) |
3215 | return drv->bdrv_snapshot_create(bs, sn_info); | |
3216 | if (bs->file) | |
3217 | return bdrv_snapshot_create(bs->file, sn_info); | |
3218 | return -ENOTSUP; | |
faea38e7 FB |
3219 | } |
3220 | ||
5fafdf24 | 3221 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
3222 | const char *snapshot_id) |
3223 | { | |
3224 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
3225 | int ret, open_ret; |
3226 | ||
faea38e7 | 3227 | if (!drv) |
19cb3738 | 3228 | return -ENOMEDIUM; |
7cdb1f6d MK |
3229 | if (drv->bdrv_snapshot_goto) |
3230 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
3231 | ||
3232 | if (bs->file) { | |
3233 | drv->bdrv_close(bs); | |
3234 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
1a86938f | 3235 | open_ret = drv->bdrv_open(bs, NULL, bs->open_flags); |
7cdb1f6d MK |
3236 | if (open_ret < 0) { |
3237 | bdrv_delete(bs->file); | |
3238 | bs->drv = NULL; | |
3239 | return open_ret; | |
3240 | } | |
3241 | return ret; | |
3242 | } | |
3243 | ||
3244 | return -ENOTSUP; | |
faea38e7 FB |
3245 | } |
3246 | ||
3247 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
3248 | { | |
3249 | BlockDriver *drv = bs->drv; | |
3250 | if (!drv) | |
19cb3738 | 3251 | return -ENOMEDIUM; |
7cdb1f6d MK |
3252 | if (drv->bdrv_snapshot_delete) |
3253 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
3254 | if (bs->file) | |
3255 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
3256 | return -ENOTSUP; | |
faea38e7 FB |
3257 | } |
3258 | ||
5fafdf24 | 3259 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
3260 | QEMUSnapshotInfo **psn_info) |
3261 | { | |
3262 | BlockDriver *drv = bs->drv; | |
3263 | if (!drv) | |
19cb3738 | 3264 | return -ENOMEDIUM; |
7cdb1f6d MK |
3265 | if (drv->bdrv_snapshot_list) |
3266 | return drv->bdrv_snapshot_list(bs, psn_info); | |
3267 | if (bs->file) | |
3268 | return bdrv_snapshot_list(bs->file, psn_info); | |
3269 | return -ENOTSUP; | |
faea38e7 FB |
3270 | } |
3271 | ||
51ef6727 | 3272 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
3273 | const char *snapshot_name) | |
3274 | { | |
3275 | BlockDriver *drv = bs->drv; | |
3276 | if (!drv) { | |
3277 | return -ENOMEDIUM; | |
3278 | } | |
3279 | if (!bs->read_only) { | |
3280 | return -EINVAL; | |
3281 | } | |
3282 | if (drv->bdrv_snapshot_load_tmp) { | |
3283 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
3284 | } | |
3285 | return -ENOTSUP; | |
3286 | } | |
3287 | ||
b1b1d783 JC |
3288 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3289 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3290 | * from a BDS as backing_file should not be done, as that may be relative to | |
3291 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
3292 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
3293 | const char *backing_file) | |
3294 | { | |
b1b1d783 JC |
3295 | char *filename_full = NULL; |
3296 | char *backing_file_full = NULL; | |
3297 | char *filename_tmp = NULL; | |
3298 | int is_protocol = 0; | |
3299 | BlockDriverState *curr_bs = NULL; | |
3300 | BlockDriverState *retval = NULL; | |
3301 | ||
3302 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
3303 | return NULL; |
3304 | } | |
3305 | ||
b1b1d783 JC |
3306 | filename_full = g_malloc(PATH_MAX); |
3307 | backing_file_full = g_malloc(PATH_MAX); | |
3308 | filename_tmp = g_malloc(PATH_MAX); | |
3309 | ||
3310 | is_protocol = path_has_protocol(backing_file); | |
3311 | ||
3312 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
3313 | ||
3314 | /* If either of the filename paths is actually a protocol, then | |
3315 | * compare unmodified paths; otherwise make paths relative */ | |
3316 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3317 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
3318 | retval = curr_bs->backing_hd; | |
3319 | break; | |
3320 | } | |
e8a6bb9c | 3321 | } else { |
b1b1d783 JC |
3322 | /* If not an absolute filename path, make it relative to the current |
3323 | * image's filename path */ | |
3324 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3325 | backing_file); | |
3326 | ||
3327 | /* We are going to compare absolute pathnames */ | |
3328 | if (!realpath(filename_tmp, filename_full)) { | |
3329 | continue; | |
3330 | } | |
3331 | ||
3332 | /* We need to make sure the backing filename we are comparing against | |
3333 | * is relative to the current image filename (or absolute) */ | |
3334 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3335 | curr_bs->backing_file); | |
3336 | ||
3337 | if (!realpath(filename_tmp, backing_file_full)) { | |
3338 | continue; | |
3339 | } | |
3340 | ||
3341 | if (strcmp(backing_file_full, filename_full) == 0) { | |
3342 | retval = curr_bs->backing_hd; | |
3343 | break; | |
3344 | } | |
e8a6bb9c MT |
3345 | } |
3346 | } | |
3347 | ||
b1b1d783 JC |
3348 | g_free(filename_full); |
3349 | g_free(backing_file_full); | |
3350 | g_free(filename_tmp); | |
3351 | return retval; | |
e8a6bb9c MT |
3352 | } |
3353 | ||
f198fd1c BC |
3354 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
3355 | { | |
3356 | if (!bs->drv) { | |
3357 | return 0; | |
3358 | } | |
3359 | ||
3360 | if (!bs->backing_hd) { | |
3361 | return 0; | |
3362 | } | |
3363 | ||
3364 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
3365 | } | |
3366 | ||
79fac568 JC |
3367 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
3368 | { | |
3369 | BlockDriverState *curr_bs = NULL; | |
3370 | ||
3371 | if (!bs) { | |
3372 | return NULL; | |
3373 | } | |
3374 | ||
3375 | curr_bs = bs; | |
3376 | ||
3377 | while (curr_bs->backing_hd) { | |
3378 | curr_bs = curr_bs->backing_hd; | |
3379 | } | |
3380 | return curr_bs; | |
3381 | } | |
3382 | ||
faea38e7 FB |
3383 | #define NB_SUFFIXES 4 |
3384 | ||
3385 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
3386 | { | |
3387 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
3388 | int64_t base; | |
3389 | int i; | |
3390 | ||
3391 | if (size <= 999) { | |
3392 | snprintf(buf, buf_size, "%" PRId64, size); | |
3393 | } else { | |
3394 | base = 1024; | |
3395 | for(i = 0; i < NB_SUFFIXES; i++) { | |
3396 | if (size < (10 * base)) { | |
5fafdf24 | 3397 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
3398 | (double)size / base, |
3399 | suffixes[i]); | |
3400 | break; | |
3401 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 3402 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
3403 | ((size + (base >> 1)) / base), |
3404 | suffixes[i]); | |
3405 | break; | |
3406 | } | |
3407 | base = base * 1024; | |
3408 | } | |
3409 | } | |
3410 | return buf; | |
3411 | } | |
3412 | ||
3413 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
3414 | { | |
3415 | char buf1[128], date_buf[128], clock_buf[128]; | |
3416 | struct tm tm; | |
3417 | time_t ti; | |
3418 | int64_t secs; | |
3419 | ||
3420 | if (!sn) { | |
5fafdf24 TS |
3421 | snprintf(buf, buf_size, |
3422 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
3423 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
3424 | } else { | |
3425 | ti = sn->date_sec; | |
3426 | localtime_r(&ti, &tm); | |
3427 | strftime(date_buf, sizeof(date_buf), | |
3428 | "%Y-%m-%d %H:%M:%S", &tm); | |
3429 | secs = sn->vm_clock_nsec / 1000000000; | |
3430 | snprintf(clock_buf, sizeof(clock_buf), | |
3431 | "%02d:%02d:%02d.%03d", | |
3432 | (int)(secs / 3600), | |
3433 | (int)((secs / 60) % 60), | |
5fafdf24 | 3434 | (int)(secs % 60), |
faea38e7 FB |
3435 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
3436 | snprintf(buf, buf_size, | |
5fafdf24 | 3437 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
3438 | sn->id_str, sn->name, |
3439 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
3440 | date_buf, | |
3441 | clock_buf); | |
3442 | } | |
3443 | return buf; | |
3444 | } | |
3445 | ||
ea2384d3 | 3446 | /**************************************************************/ |
83f64091 | 3447 | /* async I/Os */ |
ea2384d3 | 3448 | |
3b69e4b9 | 3449 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3450 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3451 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3452 | { |
bbf0a440 SH |
3453 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3454 | ||
b2a61371 | 3455 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3456 | cb, opaque, false); |
ea2384d3 FB |
3457 | } |
3458 | ||
f141eafe AL |
3459 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3460 | QEMUIOVector *qiov, int nb_sectors, | |
3461 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3462 | { |
bbf0a440 SH |
3463 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3464 | ||
1a6e115b | 3465 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3466 | cb, opaque, true); |
83f64091 FB |
3467 | } |
3468 | ||
40b4f539 KW |
3469 | |
3470 | typedef struct MultiwriteCB { | |
3471 | int error; | |
3472 | int num_requests; | |
3473 | int num_callbacks; | |
3474 | struct { | |
3475 | BlockDriverCompletionFunc *cb; | |
3476 | void *opaque; | |
3477 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3478 | } callbacks[]; |
3479 | } MultiwriteCB; | |
3480 | ||
3481 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3482 | { | |
3483 | int i; | |
3484 | ||
3485 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3486 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3487 | if (mcb->callbacks[i].free_qiov) { |
3488 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3489 | } | |
7267c094 | 3490 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3491 | } |
3492 | } | |
3493 | ||
3494 | static void multiwrite_cb(void *opaque, int ret) | |
3495 | { | |
3496 | MultiwriteCB *mcb = opaque; | |
3497 | ||
6d519a5f SH |
3498 | trace_multiwrite_cb(mcb, ret); |
3499 | ||
cb6d3ca0 | 3500 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3501 | mcb->error = ret; |
40b4f539 KW |
3502 | } |
3503 | ||
3504 | mcb->num_requests--; | |
3505 | if (mcb->num_requests == 0) { | |
de189a1b | 3506 | multiwrite_user_cb(mcb); |
7267c094 | 3507 | g_free(mcb); |
40b4f539 KW |
3508 | } |
3509 | } | |
3510 | ||
3511 | static int multiwrite_req_compare(const void *a, const void *b) | |
3512 | { | |
77be4366 CH |
3513 | const BlockRequest *req1 = a, *req2 = b; |
3514 | ||
3515 | /* | |
3516 | * Note that we can't simply subtract req2->sector from req1->sector | |
3517 | * here as that could overflow the return value. | |
3518 | */ | |
3519 | if (req1->sector > req2->sector) { | |
3520 | return 1; | |
3521 | } else if (req1->sector < req2->sector) { | |
3522 | return -1; | |
3523 | } else { | |
3524 | return 0; | |
3525 | } | |
40b4f539 KW |
3526 | } |
3527 | ||
3528 | /* | |
3529 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3530 | * requests that remain after merging. | |
3531 | */ | |
3532 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3533 | int num_reqs, MultiwriteCB *mcb) | |
3534 | { | |
3535 | int i, outidx; | |
3536 | ||
3537 | // Sort requests by start sector | |
3538 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3539 | ||
3540 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3541 | // filling up gaps with zero sectors. | |
3542 | outidx = 0; | |
3543 | for (i = 1; i < num_reqs; i++) { | |
3544 | int merge = 0; | |
3545 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3546 | ||
b6a127a1 | 3547 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3548 | if (reqs[i].sector <= oldreq_last) { |
3549 | merge = 1; | |
3550 | } | |
3551 | ||
e2a305fb CH |
3552 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3553 | merge = 0; | |
3554 | } | |
3555 | ||
40b4f539 KW |
3556 | if (merge) { |
3557 | size_t size; | |
7267c094 | 3558 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3559 | qemu_iovec_init(qiov, |
3560 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3561 | ||
3562 | // Add the first request to the merged one. If the requests are | |
3563 | // overlapping, drop the last sectors of the first request. | |
3564 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 3565 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 3566 | |
b6a127a1 PB |
3567 | // We should need to add any zeros between the two requests |
3568 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3569 | |
3570 | // Add the second request | |
1b093c48 | 3571 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 3572 | |
cbf1dff2 | 3573 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3574 | reqs[outidx].qiov = qiov; |
3575 | ||
3576 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3577 | } else { | |
3578 | outidx++; | |
3579 | reqs[outidx].sector = reqs[i].sector; | |
3580 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3581 | reqs[outidx].qiov = reqs[i].qiov; | |
3582 | } | |
3583 | } | |
3584 | ||
3585 | return outidx + 1; | |
3586 | } | |
3587 | ||
3588 | /* | |
3589 | * Submit multiple AIO write requests at once. | |
3590 | * | |
3591 | * On success, the function returns 0 and all requests in the reqs array have | |
3592 | * been submitted. In error case this function returns -1, and any of the | |
3593 | * requests may or may not be submitted yet. In particular, this means that the | |
3594 | * callback will be called for some of the requests, for others it won't. The | |
3595 | * caller must check the error field of the BlockRequest to wait for the right | |
3596 | * callbacks (if error != 0, no callback will be called). | |
3597 | * | |
3598 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3599 | * requests. However, the fields opaque and error are left unmodified as they | |
3600 | * are used to signal failure for a single request to the caller. | |
3601 | */ | |
3602 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3603 | { | |
40b4f539 KW |
3604 | MultiwriteCB *mcb; |
3605 | int i; | |
3606 | ||
301db7c2 RH |
3607 | /* don't submit writes if we don't have a medium */ |
3608 | if (bs->drv == NULL) { | |
3609 | for (i = 0; i < num_reqs; i++) { | |
3610 | reqs[i].error = -ENOMEDIUM; | |
3611 | } | |
3612 | return -1; | |
3613 | } | |
3614 | ||
40b4f539 KW |
3615 | if (num_reqs == 0) { |
3616 | return 0; | |
3617 | } | |
3618 | ||
3619 | // Create MultiwriteCB structure | |
7267c094 | 3620 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3621 | mcb->num_requests = 0; |
3622 | mcb->num_callbacks = num_reqs; | |
3623 | ||
3624 | for (i = 0; i < num_reqs; i++) { | |
3625 | mcb->callbacks[i].cb = reqs[i].cb; | |
3626 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3627 | } | |
3628 | ||
3629 | // Check for mergable requests | |
3630 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3631 | ||
6d519a5f SH |
3632 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3633 | ||
df9309fb PB |
3634 | /* Run the aio requests. */ |
3635 | mcb->num_requests = num_reqs; | |
40b4f539 | 3636 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3637 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3638 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3639 | } |
3640 | ||
3641 | return 0; | |
40b4f539 KW |
3642 | } |
3643 | ||
83f64091 | 3644 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3645 | { |
d7331bed | 3646 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
3647 | } |
3648 | ||
98f90dba ZYW |
3649 | /* block I/O throttling */ |
3650 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, | |
3651 | bool is_write, double elapsed_time, uint64_t *wait) | |
3652 | { | |
3653 | uint64_t bps_limit = 0; | |
3654 | double bytes_limit, bytes_base, bytes_res; | |
3655 | double slice_time, wait_time; | |
3656 | ||
3657 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3658 | bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
3659 | } else if (bs->io_limits.bps[is_write]) { | |
3660 | bps_limit = bs->io_limits.bps[is_write]; | |
3661 | } else { | |
3662 | if (wait) { | |
3663 | *wait = 0; | |
3664 | } | |
3665 | ||
3666 | return false; | |
3667 | } | |
3668 | ||
3669 | slice_time = bs->slice_end - bs->slice_start; | |
3670 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3671 | bytes_limit = bps_limit * slice_time; | |
3672 | bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; | |
3673 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3674 | bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; | |
3675 | } | |
3676 | ||
3677 | /* bytes_base: the bytes of data which have been read/written; and | |
3678 | * it is obtained from the history statistic info. | |
3679 | * bytes_res: the remaining bytes of data which need to be read/written. | |
3680 | * (bytes_base + bytes_res) / bps_limit: used to calcuate | |
3681 | * the total time for completing reading/writting all data. | |
3682 | */ | |
3683 | bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
3684 | ||
3685 | if (bytes_base + bytes_res <= bytes_limit) { | |
3686 | if (wait) { | |
3687 | *wait = 0; | |
3688 | } | |
3689 | ||
3690 | return false; | |
3691 | } | |
3692 | ||
3693 | /* Calc approx time to dispatch */ | |
3694 | wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; | |
3695 | ||
3696 | /* When the I/O rate at runtime exceeds the limits, | |
3697 | * bs->slice_end need to be extended in order that the current statistic | |
3698 | * info can be kept until the timer fire, so it is increased and tuned | |
3699 | * based on the result of experiment. | |
3700 | */ | |
3701 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3702 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3703 | if (wait) { | |
3704 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3705 | } | |
3706 | ||
3707 | return true; | |
3708 | } | |
3709 | ||
3710 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
3711 | double elapsed_time, uint64_t *wait) | |
3712 | { | |
3713 | uint64_t iops_limit = 0; | |
3714 | double ios_limit, ios_base; | |
3715 | double slice_time, wait_time; | |
3716 | ||
3717 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3718 | iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
3719 | } else if (bs->io_limits.iops[is_write]) { | |
3720 | iops_limit = bs->io_limits.iops[is_write]; | |
3721 | } else { | |
3722 | if (wait) { | |
3723 | *wait = 0; | |
3724 | } | |
3725 | ||
3726 | return false; | |
3727 | } | |
3728 | ||
3729 | slice_time = bs->slice_end - bs->slice_start; | |
3730 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3731 | ios_limit = iops_limit * slice_time; | |
3732 | ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; | |
3733 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3734 | ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; | |
3735 | } | |
3736 | ||
3737 | if (ios_base + 1 <= ios_limit) { | |
3738 | if (wait) { | |
3739 | *wait = 0; | |
3740 | } | |
3741 | ||
3742 | return false; | |
3743 | } | |
3744 | ||
3745 | /* Calc approx time to dispatch */ | |
3746 | wait_time = (ios_base + 1) / iops_limit; | |
3747 | if (wait_time > elapsed_time) { | |
3748 | wait_time = wait_time - elapsed_time; | |
3749 | } else { | |
3750 | wait_time = 0; | |
3751 | } | |
3752 | ||
3753 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3754 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3755 | if (wait) { | |
3756 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3757 | } | |
3758 | ||
3759 | return true; | |
3760 | } | |
3761 | ||
3762 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
3763 | bool is_write, int64_t *wait) | |
3764 | { | |
3765 | int64_t now, max_wait; | |
3766 | uint64_t bps_wait = 0, iops_wait = 0; | |
3767 | double elapsed_time; | |
3768 | int bps_ret, iops_ret; | |
3769 | ||
3770 | now = qemu_get_clock_ns(vm_clock); | |
3771 | if ((bs->slice_start < now) | |
3772 | && (bs->slice_end > now)) { | |
3773 | bs->slice_end = now + bs->slice_time; | |
3774 | } else { | |
3775 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
3776 | bs->slice_start = now; | |
3777 | bs->slice_end = now + bs->slice_time; | |
3778 | ||
3779 | bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; | |
3780 | bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; | |
3781 | ||
3782 | bs->io_base.ios[is_write] = bs->nr_ops[is_write]; | |
3783 | bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; | |
3784 | } | |
3785 | ||
3786 | elapsed_time = now - bs->slice_start; | |
3787 | elapsed_time /= (NANOSECONDS_PER_SECOND); | |
3788 | ||
3789 | bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, | |
3790 | is_write, elapsed_time, &bps_wait); | |
3791 | iops_ret = bdrv_exceed_iops_limits(bs, is_write, | |
3792 | elapsed_time, &iops_wait); | |
3793 | if (bps_ret || iops_ret) { | |
3794 | max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; | |
3795 | if (wait) { | |
3796 | *wait = max_wait; | |
3797 | } | |
3798 | ||
3799 | now = qemu_get_clock_ns(vm_clock); | |
3800 | if (bs->slice_end < now + max_wait) { | |
3801 | bs->slice_end = now + max_wait; | |
3802 | } | |
3803 | ||
3804 | return true; | |
3805 | } | |
3806 | ||
3807 | if (wait) { | |
3808 | *wait = 0; | |
3809 | } | |
3810 | ||
3811 | return false; | |
3812 | } | |
ce1a14dc | 3813 | |
83f64091 FB |
3814 | /**************************************************************/ |
3815 | /* async block device emulation */ | |
3816 | ||
c16b5a2c CH |
3817 | typedef struct BlockDriverAIOCBSync { |
3818 | BlockDriverAIOCB common; | |
3819 | QEMUBH *bh; | |
3820 | int ret; | |
3821 | /* vector translation state */ | |
3822 | QEMUIOVector *qiov; | |
3823 | uint8_t *bounce; | |
3824 | int is_write; | |
3825 | } BlockDriverAIOCBSync; | |
3826 | ||
3827 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3828 | { | |
b666d239 KW |
3829 | BlockDriverAIOCBSync *acb = |
3830 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3831 | qemu_bh_delete(acb->bh); |
36afc451 | 3832 | acb->bh = NULL; |
c16b5a2c CH |
3833 | qemu_aio_release(acb); |
3834 | } | |
3835 | ||
d7331bed | 3836 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
3837 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
3838 | .cancel = bdrv_aio_cancel_em, | |
3839 | }; | |
3840 | ||
ce1a14dc | 3841 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3842 | { |
ce1a14dc | 3843 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3844 | |
f141eafe | 3845 | if (!acb->is_write) |
03396148 | 3846 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 3847 | qemu_vfree(acb->bounce); |
ce1a14dc | 3848 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3849 | qemu_bh_delete(acb->bh); |
36afc451 | 3850 | acb->bh = NULL; |
ce1a14dc | 3851 | qemu_aio_release(acb); |
83f64091 | 3852 | } |
beac80cd | 3853 | |
f141eafe AL |
3854 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3855 | int64_t sector_num, | |
3856 | QEMUIOVector *qiov, | |
3857 | int nb_sectors, | |
3858 | BlockDriverCompletionFunc *cb, | |
3859 | void *opaque, | |
3860 | int is_write) | |
3861 | ||
83f64091 | 3862 | { |
ce1a14dc | 3863 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3864 | |
d7331bed | 3865 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
3866 | acb->is_write = is_write; |
3867 | acb->qiov = qiov; | |
e268ca52 | 3868 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3869 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3870 | |
3871 | if (is_write) { | |
d5e6b161 | 3872 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 3873 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3874 | } else { |
1ed20acf | 3875 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3876 | } |
3877 | ||
ce1a14dc | 3878 | qemu_bh_schedule(acb->bh); |
f141eafe | 3879 | |
ce1a14dc | 3880 | return &acb->common; |
beac80cd FB |
3881 | } |
3882 | ||
f141eafe AL |
3883 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3884 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3885 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3886 | { |
f141eafe AL |
3887 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3888 | } | |
83f64091 | 3889 | |
f141eafe AL |
3890 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3891 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3892 | BlockDriverCompletionFunc *cb, void *opaque) | |
3893 | { | |
3894 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3895 | } |
beac80cd | 3896 | |
68485420 KW |
3897 | |
3898 | typedef struct BlockDriverAIOCBCoroutine { | |
3899 | BlockDriverAIOCB common; | |
3900 | BlockRequest req; | |
3901 | bool is_write; | |
d318aea9 | 3902 | bool *done; |
68485420 KW |
3903 | QEMUBH* bh; |
3904 | } BlockDriverAIOCBCoroutine; | |
3905 | ||
3906 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3907 | { | |
d318aea9 KW |
3908 | BlockDriverAIOCBCoroutine *acb = |
3909 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
3910 | bool done = false; | |
3911 | ||
3912 | acb->done = &done; | |
3913 | while (!done) { | |
3914 | qemu_aio_wait(); | |
3915 | } | |
68485420 KW |
3916 | } |
3917 | ||
d7331bed | 3918 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
3919 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
3920 | .cancel = bdrv_aio_co_cancel_em, | |
3921 | }; | |
3922 | ||
35246a68 | 3923 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3924 | { |
3925 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3926 | ||
3927 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
3928 | |
3929 | if (acb->done) { | |
3930 | *acb->done = true; | |
3931 | } | |
3932 | ||
68485420 KW |
3933 | qemu_bh_delete(acb->bh); |
3934 | qemu_aio_release(acb); | |
3935 | } | |
3936 | ||
b2a61371 SH |
3937 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3938 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3939 | { | |
3940 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3941 | BlockDriverState *bs = acb->common.bs; | |
3942 | ||
3943 | if (!acb->is_write) { | |
3944 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3945 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3946 | } else { |
3947 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3948 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3949 | } |
3950 | ||
35246a68 | 3951 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3952 | qemu_bh_schedule(acb->bh); |
3953 | } | |
3954 | ||
68485420 KW |
3955 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3956 | int64_t sector_num, | |
3957 | QEMUIOVector *qiov, | |
3958 | int nb_sectors, | |
3959 | BlockDriverCompletionFunc *cb, | |
3960 | void *opaque, | |
8c5873d6 | 3961 | bool is_write) |
68485420 KW |
3962 | { |
3963 | Coroutine *co; | |
3964 | BlockDriverAIOCBCoroutine *acb; | |
3965 | ||
d7331bed | 3966 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
3967 | acb->req.sector = sector_num; |
3968 | acb->req.nb_sectors = nb_sectors; | |
3969 | acb->req.qiov = qiov; | |
3970 | acb->is_write = is_write; | |
d318aea9 | 3971 | acb->done = NULL; |
68485420 | 3972 | |
8c5873d6 | 3973 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3974 | qemu_coroutine_enter(co, acb); |
3975 | ||
3976 | return &acb->common; | |
3977 | } | |
3978 | ||
07f07615 | 3979 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3980 | { |
07f07615 PB |
3981 | BlockDriverAIOCBCoroutine *acb = opaque; |
3982 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3983 | |
07f07615 PB |
3984 | acb->req.error = bdrv_co_flush(bs); |
3985 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3986 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3987 | } |
3988 | ||
07f07615 | 3989 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3990 | BlockDriverCompletionFunc *cb, void *opaque) |
3991 | { | |
07f07615 | 3992 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3993 | |
07f07615 PB |
3994 | Coroutine *co; |
3995 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3996 | |
d7331bed | 3997 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
3998 | acb->done = NULL; |
3999 | ||
07f07615 PB |
4000 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4001 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4002 | |
016f5cf6 AG |
4003 | return &acb->common; |
4004 | } | |
4005 | ||
4265d620 PB |
4006 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4007 | { | |
4008 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4009 | BlockDriverState *bs = acb->common.bs; | |
4010 | ||
4011 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
4012 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
4013 | qemu_bh_schedule(acb->bh); | |
4014 | } | |
4015 | ||
4016 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
4017 | int64_t sector_num, int nb_sectors, | |
4018 | BlockDriverCompletionFunc *cb, void *opaque) | |
4019 | { | |
4020 | Coroutine *co; | |
4021 | BlockDriverAIOCBCoroutine *acb; | |
4022 | ||
4023 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4024 | ||
d7331bed | 4025 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4026 | acb->req.sector = sector_num; |
4027 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 4028 | acb->done = NULL; |
4265d620 PB |
4029 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
4030 | qemu_coroutine_enter(co, acb); | |
4031 | ||
4032 | return &acb->common; | |
4033 | } | |
4034 | ||
ea2384d3 FB |
4035 | void bdrv_init(void) |
4036 | { | |
5efa9d5a | 4037 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4038 | } |
ce1a14dc | 4039 | |
eb852011 MA |
4040 | void bdrv_init_with_whitelist(void) |
4041 | { | |
4042 | use_bdrv_whitelist = 1; | |
4043 | bdrv_init(); | |
4044 | } | |
4045 | ||
d7331bed | 4046 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 4047 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 4048 | { |
ce1a14dc PB |
4049 | BlockDriverAIOCB *acb; |
4050 | ||
d7331bed SH |
4051 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4052 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4053 | acb->bs = bs; |
4054 | acb->cb = cb; | |
4055 | acb->opaque = opaque; | |
4056 | return acb; | |
4057 | } | |
4058 | ||
4059 | void qemu_aio_release(void *p) | |
4060 | { | |
d37c975f | 4061 | BlockDriverAIOCB *acb = p; |
d7331bed | 4062 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 4063 | } |
19cb3738 | 4064 | |
f9f05dc5 KW |
4065 | /**************************************************************/ |
4066 | /* Coroutine block device emulation */ | |
4067 | ||
4068 | typedef struct CoroutineIOCompletion { | |
4069 | Coroutine *coroutine; | |
4070 | int ret; | |
4071 | } CoroutineIOCompletion; | |
4072 | ||
4073 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4074 | { | |
4075 | CoroutineIOCompletion *co = opaque; | |
4076 | ||
4077 | co->ret = ret; | |
4078 | qemu_coroutine_enter(co->coroutine, NULL); | |
4079 | } | |
4080 | ||
4081 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4082 | int nb_sectors, QEMUIOVector *iov, | |
4083 | bool is_write) | |
4084 | { | |
4085 | CoroutineIOCompletion co = { | |
4086 | .coroutine = qemu_coroutine_self(), | |
4087 | }; | |
4088 | BlockDriverAIOCB *acb; | |
4089 | ||
4090 | if (is_write) { | |
a652d160 SH |
4091 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4092 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4093 | } else { |
a652d160 SH |
4094 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4095 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4096 | } |
4097 | ||
59370aaa | 4098 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4099 | if (!acb) { |
4100 | return -EIO; | |
4101 | } | |
4102 | qemu_coroutine_yield(); | |
4103 | ||
4104 | return co.ret; | |
4105 | } | |
4106 | ||
4107 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4108 | int64_t sector_num, int nb_sectors, | |
4109 | QEMUIOVector *iov) | |
4110 | { | |
4111 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4112 | } | |
4113 | ||
4114 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4115 | int64_t sector_num, int nb_sectors, | |
4116 | QEMUIOVector *iov) | |
4117 | { | |
4118 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4119 | } | |
4120 | ||
07f07615 | 4121 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4122 | { |
07f07615 PB |
4123 | RwCo *rwco = opaque; |
4124 | ||
4125 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4126 | } | |
4127 | ||
4128 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4129 | { | |
eb489bb1 KW |
4130 | int ret; |
4131 | ||
29cdb251 | 4132 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4133 | return 0; |
eb489bb1 KW |
4134 | } |
4135 | ||
ca716364 | 4136 | /* Write back cached data to the OS even with cache=unsafe */ |
eb489bb1 KW |
4137 | if (bs->drv->bdrv_co_flush_to_os) { |
4138 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4139 | if (ret < 0) { | |
4140 | return ret; | |
4141 | } | |
4142 | } | |
4143 | ||
ca716364 KW |
4144 | /* But don't actually force it to the disk with cache=unsafe */ |
4145 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4146 | goto flush_parent; |
ca716364 KW |
4147 | } |
4148 | ||
eb489bb1 | 4149 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4150 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4151 | } else if (bs->drv->bdrv_aio_flush) { |
4152 | BlockDriverAIOCB *acb; | |
4153 | CoroutineIOCompletion co = { | |
4154 | .coroutine = qemu_coroutine_self(), | |
4155 | }; | |
4156 | ||
4157 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4158 | if (acb == NULL) { | |
29cdb251 | 4159 | ret = -EIO; |
07f07615 PB |
4160 | } else { |
4161 | qemu_coroutine_yield(); | |
29cdb251 | 4162 | ret = co.ret; |
07f07615 | 4163 | } |
07f07615 PB |
4164 | } else { |
4165 | /* | |
4166 | * Some block drivers always operate in either writethrough or unsafe | |
4167 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4168 | * know how the server works (because the behaviour is hardcoded or | |
4169 | * depends on server-side configuration), so we can't ensure that | |
4170 | * everything is safe on disk. Returning an error doesn't work because | |
4171 | * that would break guests even if the server operates in writethrough | |
4172 | * mode. | |
4173 | * | |
4174 | * Let's hope the user knows what he's doing. | |
4175 | */ | |
29cdb251 | 4176 | ret = 0; |
07f07615 | 4177 | } |
29cdb251 PB |
4178 | if (ret < 0) { |
4179 | return ret; | |
4180 | } | |
4181 | ||
4182 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4183 | * in the case of cache=unsafe, so there are no useless flushes. | |
4184 | */ | |
d4c82329 | 4185 | flush_parent: |
29cdb251 | 4186 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4187 | } |
4188 | ||
0f15423c AL |
4189 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4190 | { | |
4191 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4192 | bs->drv->bdrv_invalidate_cache(bs); | |
4193 | } | |
4194 | } | |
4195 | ||
4196 | void bdrv_invalidate_cache_all(void) | |
4197 | { | |
4198 | BlockDriverState *bs; | |
4199 | ||
4200 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4201 | bdrv_invalidate_cache(bs); | |
4202 | } | |
4203 | } | |
4204 | ||
07789269 BC |
4205 | void bdrv_clear_incoming_migration_all(void) |
4206 | { | |
4207 | BlockDriverState *bs; | |
4208 | ||
4209 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4210 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
4211 | } | |
4212 | } | |
4213 | ||
07f07615 PB |
4214 | int bdrv_flush(BlockDriverState *bs) |
4215 | { | |
4216 | Coroutine *co; | |
4217 | RwCo rwco = { | |
4218 | .bs = bs, | |
4219 | .ret = NOT_DONE, | |
e7a8a783 | 4220 | }; |
e7a8a783 | 4221 | |
07f07615 PB |
4222 | if (qemu_in_coroutine()) { |
4223 | /* Fast-path if already in coroutine context */ | |
4224 | bdrv_flush_co_entry(&rwco); | |
4225 | } else { | |
4226 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4227 | qemu_coroutine_enter(co, &rwco); | |
4228 | while (rwco.ret == NOT_DONE) { | |
4229 | qemu_aio_wait(); | |
4230 | } | |
e7a8a783 | 4231 | } |
07f07615 PB |
4232 | |
4233 | return rwco.ret; | |
e7a8a783 KW |
4234 | } |
4235 | ||
4265d620 PB |
4236 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4237 | { | |
4238 | RwCo *rwco = opaque; | |
4239 | ||
4240 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4241 | } | |
4242 | ||
4243 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
4244 | int nb_sectors) | |
4245 | { | |
4246 | if (!bs->drv) { | |
4247 | return -ENOMEDIUM; | |
4248 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4249 | return -EIO; | |
4250 | } else if (bs->read_only) { | |
4251 | return -EROFS; | |
df702c9b PB |
4252 | } |
4253 | ||
4254 | if (bs->dirty_bitmap) { | |
8f0720ec | 4255 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b PB |
4256 | } |
4257 | ||
9e8f1835 PB |
4258 | /* Do nothing if disabled. */ |
4259 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
4260 | return 0; | |
4261 | } | |
4262 | ||
df702c9b | 4263 | if (bs->drv->bdrv_co_discard) { |
4265d620 PB |
4264 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); |
4265 | } else if (bs->drv->bdrv_aio_discard) { | |
4266 | BlockDriverAIOCB *acb; | |
4267 | CoroutineIOCompletion co = { | |
4268 | .coroutine = qemu_coroutine_self(), | |
4269 | }; | |
4270 | ||
4271 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4272 | bdrv_co_io_em_complete, &co); | |
4273 | if (acb == NULL) { | |
4274 | return -EIO; | |
4275 | } else { | |
4276 | qemu_coroutine_yield(); | |
4277 | return co.ret; | |
4278 | } | |
4265d620 PB |
4279 | } else { |
4280 | return 0; | |
4281 | } | |
4282 | } | |
4283 | ||
4284 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4285 | { | |
4286 | Coroutine *co; | |
4287 | RwCo rwco = { | |
4288 | .bs = bs, | |
4289 | .sector_num = sector_num, | |
4290 | .nb_sectors = nb_sectors, | |
4291 | .ret = NOT_DONE, | |
4292 | }; | |
4293 | ||
4294 | if (qemu_in_coroutine()) { | |
4295 | /* Fast-path if already in coroutine context */ | |
4296 | bdrv_discard_co_entry(&rwco); | |
4297 | } else { | |
4298 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4299 | qemu_coroutine_enter(co, &rwco); | |
4300 | while (rwco.ret == NOT_DONE) { | |
4301 | qemu_aio_wait(); | |
4302 | } | |
4303 | } | |
4304 | ||
4305 | return rwco.ret; | |
4306 | } | |
4307 | ||
19cb3738 FB |
4308 | /**************************************************************/ |
4309 | /* removable device support */ | |
4310 | ||
4311 | /** | |
4312 | * Return TRUE if the media is present | |
4313 | */ | |
4314 | int bdrv_is_inserted(BlockDriverState *bs) | |
4315 | { | |
4316 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4317 | |
19cb3738 FB |
4318 | if (!drv) |
4319 | return 0; | |
4320 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4321 | return 1; |
4322 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4323 | } |
4324 | ||
4325 | /** | |
8e49ca46 MA |
4326 | * Return whether the media changed since the last call to this |
4327 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4328 | */ |
4329 | int bdrv_media_changed(BlockDriverState *bs) | |
4330 | { | |
4331 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4332 | |
8e49ca46 MA |
4333 | if (drv && drv->bdrv_media_changed) { |
4334 | return drv->bdrv_media_changed(bs); | |
4335 | } | |
4336 | return -ENOTSUP; | |
19cb3738 FB |
4337 | } |
4338 | ||
4339 | /** | |
4340 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4341 | */ | |
f36f3949 | 4342 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4343 | { |
4344 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4345 | |
822e1cd1 MA |
4346 | if (drv && drv->bdrv_eject) { |
4347 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4348 | } |
6f382ed2 LC |
4349 | |
4350 | if (bs->device_name[0] != '\0') { | |
4351 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4352 | } | |
19cb3738 FB |
4353 | } |
4354 | ||
19cb3738 FB |
4355 | /** |
4356 | * Lock or unlock the media (if it is locked, the user won't be able | |
4357 | * to eject it manually). | |
4358 | */ | |
025e849a | 4359 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4360 | { |
4361 | BlockDriver *drv = bs->drv; | |
4362 | ||
025e849a | 4363 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4364 | |
025e849a MA |
4365 | if (drv && drv->bdrv_lock_medium) { |
4366 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4367 | } |
4368 | } | |
985a03b0 TS |
4369 | |
4370 | /* needed for generic scsi interface */ | |
4371 | ||
4372 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
4373 | { | |
4374 | BlockDriver *drv = bs->drv; | |
4375 | ||
4376 | if (drv && drv->bdrv_ioctl) | |
4377 | return drv->bdrv_ioctl(bs, req, buf); | |
4378 | return -ENOTSUP; | |
4379 | } | |
7d780669 | 4380 | |
221f715d AL |
4381 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
4382 | unsigned long int req, void *buf, | |
4383 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 4384 | { |
221f715d | 4385 | BlockDriver *drv = bs->drv; |
7d780669 | 4386 | |
221f715d AL |
4387 | if (drv && drv->bdrv_aio_ioctl) |
4388 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
4389 | return NULL; | |
7d780669 | 4390 | } |
e268ca52 | 4391 | |
7b6f9300 MA |
4392 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
4393 | { | |
4394 | bs->buffer_alignment = align; | |
4395 | } | |
7cd1e32a | 4396 | |
e268ca52 AL |
4397 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
4398 | { | |
4399 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
4400 | } | |
7cd1e32a | 4401 | |
c53b1c51 SH |
4402 | /* |
4403 | * Check if all memory in this vector is sector aligned. | |
4404 | */ | |
4405 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
4406 | { | |
4407 | int i; | |
4408 | ||
4409 | for (i = 0; i < qiov->niov; i++) { | |
4410 | if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { | |
4411 | return false; | |
4412 | } | |
4413 | } | |
4414 | ||
4415 | return true; | |
4416 | } | |
4417 | ||
50717e94 | 4418 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity) |
7cd1e32a LS |
4419 | { |
4420 | int64_t bitmap_size; | |
a55eb92c | 4421 | |
50717e94 PB |
4422 | assert((granularity & (granularity - 1)) == 0); |
4423 | ||
4424 | if (granularity) { | |
4425 | granularity >>= BDRV_SECTOR_BITS; | |
4426 | assert(!bs->dirty_bitmap); | |
4427 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); | |
4428 | bs->dirty_bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
7cd1e32a | 4429 | } else { |
c6d22830 | 4430 | if (bs->dirty_bitmap) { |
8f0720ec | 4431 | hbitmap_free(bs->dirty_bitmap); |
c6d22830 | 4432 | bs->dirty_bitmap = NULL; |
a55eb92c | 4433 | } |
7cd1e32a LS |
4434 | } |
4435 | } | |
4436 | ||
4437 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
4438 | { | |
8f0720ec PB |
4439 | if (bs->dirty_bitmap) { |
4440 | return hbitmap_get(bs->dirty_bitmap, sector); | |
7cd1e32a LS |
4441 | } else { |
4442 | return 0; | |
4443 | } | |
4444 | } | |
4445 | ||
8f0720ec | 4446 | void bdrv_dirty_iter_init(BlockDriverState *bs, HBitmapIter *hbi) |
1755da16 | 4447 | { |
8f0720ec | 4448 | hbitmap_iter_init(hbi, bs->dirty_bitmap, 0); |
1755da16 PB |
4449 | } |
4450 | ||
4451 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
4452 | int nr_sectors) | |
4453 | { | |
8f0720ec | 4454 | hbitmap_set(bs->dirty_bitmap, cur_sector, nr_sectors); |
1755da16 PB |
4455 | } |
4456 | ||
a55eb92c JK |
4457 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
4458 | int nr_sectors) | |
7cd1e32a | 4459 | { |
8f0720ec | 4460 | hbitmap_reset(bs->dirty_bitmap, cur_sector, nr_sectors); |
7cd1e32a | 4461 | } |
aaa0eb75 LS |
4462 | |
4463 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
4464 | { | |
8f0720ec | 4465 | if (bs->dirty_bitmap) { |
acc906c6 | 4466 | return hbitmap_count(bs->dirty_bitmap); |
8f0720ec PB |
4467 | } else { |
4468 | return 0; | |
4469 | } | |
aaa0eb75 | 4470 | } |
f88e1a42 | 4471 | |
db593f25 MT |
4472 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4473 | { | |
4474 | assert(bs->in_use != in_use); | |
4475 | bs->in_use = in_use; | |
4476 | } | |
4477 | ||
4478 | int bdrv_in_use(BlockDriverState *bs) | |
4479 | { | |
4480 | return bs->in_use; | |
4481 | } | |
4482 | ||
28a7282a LC |
4483 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4484 | { | |
d6bf279e | 4485 | bs->iostatus_enabled = true; |
58e21ef5 | 4486 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4487 | } |
4488 | ||
4489 | /* The I/O status is only enabled if the drive explicitly | |
4490 | * enables it _and_ the VM is configured to stop on errors */ | |
4491 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4492 | { | |
d6bf279e | 4493 | return (bs->iostatus_enabled && |
92aa5c6d PB |
4494 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
4495 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
4496 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
4497 | } |
4498 | ||
4499 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4500 | { | |
d6bf279e | 4501 | bs->iostatus_enabled = false; |
28a7282a LC |
4502 | } |
4503 | ||
4504 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4505 | { | |
4506 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4507 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
4508 | if (bs->job) { |
4509 | block_job_iostatus_reset(bs->job); | |
4510 | } | |
28a7282a LC |
4511 | } |
4512 | } | |
4513 | ||
28a7282a LC |
4514 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
4515 | { | |
3e1caa5f PB |
4516 | assert(bdrv_iostatus_is_enabled(bs)); |
4517 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
4518 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4519 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4520 | } |
4521 | } | |
4522 | ||
a597e79c CH |
4523 | void |
4524 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4525 | enum BlockAcctType type) | |
4526 | { | |
4527 | assert(type < BDRV_MAX_IOTYPE); | |
4528 | ||
4529 | cookie->bytes = bytes; | |
c488c7f6 | 4530 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4531 | cookie->type = type; |
4532 | } | |
4533 | ||
4534 | void | |
4535 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4536 | { | |
4537 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4538 | ||
4539 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4540 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4541 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4542 | } |
4543 | ||
d92ada22 LC |
4544 | void bdrv_img_create(const char *filename, const char *fmt, |
4545 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
4546 | char *options, uint64_t img_size, int flags, |
4547 | Error **errp, bool quiet) | |
f88e1a42 JS |
4548 | { |
4549 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4550 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4551 | BlockDriverState *bs = NULL; |
4552 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4553 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4554 | int ret = 0; |
4555 | ||
4556 | /* Find driver and parse its options */ | |
4557 | drv = bdrv_find_format(fmt); | |
4558 | if (!drv) { | |
71c79813 | 4559 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4560 | return; |
f88e1a42 JS |
4561 | } |
4562 | ||
4563 | proto_drv = bdrv_find_protocol(filename); | |
4564 | if (!proto_drv) { | |
71c79813 | 4565 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 4566 | return; |
f88e1a42 JS |
4567 | } |
4568 | ||
4569 | create_options = append_option_parameters(create_options, | |
4570 | drv->create_options); | |
4571 | create_options = append_option_parameters(create_options, | |
4572 | proto_drv->create_options); | |
4573 | ||
4574 | /* Create parameter list with default values */ | |
4575 | param = parse_option_parameters("", create_options, param); | |
4576 | ||
4577 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4578 | ||
4579 | /* Parse -o options */ | |
4580 | if (options) { | |
4581 | param = parse_option_parameters(options, create_options, param); | |
4582 | if (param == NULL) { | |
71c79813 | 4583 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
4584 | goto out; |
4585 | } | |
4586 | } | |
4587 | ||
4588 | if (base_filename) { | |
4589 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4590 | base_filename)) { | |
71c79813 LC |
4591 | error_setg(errp, "Backing file not supported for file format '%s'", |
4592 | fmt); | |
f88e1a42 JS |
4593 | goto out; |
4594 | } | |
4595 | } | |
4596 | ||
4597 | if (base_fmt) { | |
4598 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
4599 | error_setg(errp, "Backing file format not supported for file " |
4600 | "format '%s'", fmt); | |
f88e1a42 JS |
4601 | goto out; |
4602 | } | |
4603 | } | |
4604 | ||
792da93a JS |
4605 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4606 | if (backing_file && backing_file->value.s) { | |
4607 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
4608 | error_setg(errp, "Error: Trying to create an image with the " |
4609 | "same filename as the backing file"); | |
792da93a JS |
4610 | goto out; |
4611 | } | |
4612 | } | |
4613 | ||
f88e1a42 JS |
4614 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4615 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4616 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4617 | if (!backing_drv) { | |
71c79813 LC |
4618 | error_setg(errp, "Unknown backing file format '%s'", |
4619 | backing_fmt->value.s); | |
f88e1a42 JS |
4620 | goto out; |
4621 | } | |
4622 | } | |
4623 | ||
4624 | // The size for the image must always be specified, with one exception: | |
4625 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4626 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4627 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4628 | if (backing_file && backing_file->value.s) { |
4629 | uint64_t size; | |
f88e1a42 | 4630 | char buf[32]; |
63090dac PB |
4631 | int back_flags; |
4632 | ||
4633 | /* backing files always opened read-only */ | |
4634 | back_flags = | |
4635 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4636 | |
f88e1a42 JS |
4637 | bs = bdrv_new(""); |
4638 | ||
de9c0cec KW |
4639 | ret = bdrv_open(bs, backing_file->value.s, NULL, back_flags, |
4640 | backing_drv); | |
f88e1a42 | 4641 | if (ret < 0) { |
71c79813 LC |
4642 | error_setg_errno(errp, -ret, "Could not open '%s'", |
4643 | backing_file->value.s); | |
f88e1a42 JS |
4644 | goto out; |
4645 | } | |
4646 | bdrv_get_geometry(bs, &size); | |
4647 | size *= 512; | |
4648 | ||
4649 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4650 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4651 | } else { | |
71c79813 | 4652 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
4653 | goto out; |
4654 | } | |
4655 | } | |
4656 | ||
f382d43a MR |
4657 | if (!quiet) { |
4658 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4659 | print_option_parameters(param); | |
4660 | puts(""); | |
4661 | } | |
f88e1a42 | 4662 | ret = bdrv_create(drv, filename, param); |
f88e1a42 JS |
4663 | if (ret < 0) { |
4664 | if (ret == -ENOTSUP) { | |
71c79813 LC |
4665 | error_setg(errp,"Formatting or formatting option not supported for " |
4666 | "file format '%s'", fmt); | |
f88e1a42 | 4667 | } else if (ret == -EFBIG) { |
71c79813 LC |
4668 | error_setg(errp, "The image size is too large for file format '%s'", |
4669 | fmt); | |
f88e1a42 | 4670 | } else { |
71c79813 LC |
4671 | error_setg(errp, "%s: error while creating %s: %s", filename, fmt, |
4672 | strerror(-ret)); | |
f88e1a42 JS |
4673 | } |
4674 | } | |
4675 | ||
4676 | out: | |
4677 | free_option_parameters(create_options); | |
4678 | free_option_parameters(param); | |
4679 | ||
4680 | if (bs) { | |
4681 | bdrv_delete(bs); | |
4682 | } | |
f88e1a42 | 4683 | } |