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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
376253ec | 27 | #include "monitor.h" |
ea2384d3 | 28 | #include "block_int.h" |
5efa9d5a | 29 | #include "module.h" |
f795e743 | 30 | #include "qjson.h" |
68485420 | 31 | #include "qemu-coroutine.h" |
b2023818 | 32 | #include "qmp-commands.h" |
0563e191 | 33 | #include "qemu-timer.h" |
fc01f7e7 | 34 | |
71e72a19 | 35 | #ifdef CONFIG_BSD |
7674e7bf FB |
36 | #include <sys/types.h> |
37 | #include <sys/stat.h> | |
38 | #include <sys/ioctl.h> | |
72cf2d4f | 39 | #include <sys/queue.h> |
c5e97233 | 40 | #ifndef __DragonFly__ |
7674e7bf FB |
41 | #include <sys/disk.h> |
42 | #endif | |
c5e97233 | 43 | #endif |
7674e7bf | 44 | |
49dc768d AL |
45 | #ifdef _WIN32 |
46 | #include <windows.h> | |
47 | #endif | |
48 | ||
1c9805a3 SH |
49 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
50 | ||
470c0504 SH |
51 | typedef enum { |
52 | BDRV_REQ_COPY_ON_READ = 0x1, | |
53 | } BdrvRequestFlags; | |
54 | ||
7d4b4ba5 | 55 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
56 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
57 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 58 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
59 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
60 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 61 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
62 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
63 | int64_t sector_num, int nb_sectors, | |
64 | QEMUIOVector *iov); | |
65 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
66 | int64_t sector_num, int nb_sectors, | |
67 | QEMUIOVector *iov); | |
c5fbe571 | 68 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
69 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
70 | BdrvRequestFlags flags); | |
1c9805a3 SH |
71 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
72 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); | |
b2a61371 SH |
73 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
74 | int64_t sector_num, | |
75 | QEMUIOVector *qiov, | |
76 | int nb_sectors, | |
77 | BlockDriverCompletionFunc *cb, | |
78 | void *opaque, | |
8c5873d6 | 79 | bool is_write); |
b2a61371 | 80 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
ec530c81 | 81 | |
98f90dba ZYW |
82 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
83 | bool is_write, double elapsed_time, uint64_t *wait); | |
84 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
85 | double elapsed_time, uint64_t *wait); | |
86 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
87 | bool is_write, int64_t *wait); | |
88 | ||
1b7bdbc1 SH |
89 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
90 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 91 | |
8a22f02a SH |
92 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
93 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 94 | |
f9092b10 MA |
95 | /* The device to use for VM snapshots */ |
96 | static BlockDriverState *bs_snapshots; | |
97 | ||
eb852011 MA |
98 | /* If non-zero, use only whitelisted block drivers */ |
99 | static int use_bdrv_whitelist; | |
100 | ||
9e0b22f4 SH |
101 | #ifdef _WIN32 |
102 | static int is_windows_drive_prefix(const char *filename) | |
103 | { | |
104 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
105 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
106 | filename[1] == ':'); | |
107 | } | |
108 | ||
109 | int is_windows_drive(const char *filename) | |
110 | { | |
111 | if (is_windows_drive_prefix(filename) && | |
112 | filename[2] == '\0') | |
113 | return 1; | |
114 | if (strstart(filename, "\\\\.\\", NULL) || | |
115 | strstart(filename, "//./", NULL)) | |
116 | return 1; | |
117 | return 0; | |
118 | } | |
119 | #endif | |
120 | ||
0563e191 | 121 | /* throttling disk I/O limits */ |
98f90dba ZYW |
122 | void bdrv_io_limits_disable(BlockDriverState *bs) |
123 | { | |
124 | bs->io_limits_enabled = false; | |
125 | ||
126 | while (qemu_co_queue_next(&bs->throttled_reqs)); | |
127 | ||
128 | if (bs->block_timer) { | |
129 | qemu_del_timer(bs->block_timer); | |
130 | qemu_free_timer(bs->block_timer); | |
131 | bs->block_timer = NULL; | |
132 | } | |
133 | ||
134 | bs->slice_start = 0; | |
135 | bs->slice_end = 0; | |
136 | bs->slice_time = 0; | |
137 | memset(&bs->io_base, 0, sizeof(bs->io_base)); | |
138 | } | |
139 | ||
0563e191 ZYW |
140 | static void bdrv_block_timer(void *opaque) |
141 | { | |
142 | BlockDriverState *bs = opaque; | |
143 | ||
144 | qemu_co_queue_next(&bs->throttled_reqs); | |
145 | } | |
146 | ||
147 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
148 | { | |
149 | qemu_co_queue_init(&bs->throttled_reqs); | |
150 | bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); | |
151 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
152 | bs->slice_start = qemu_get_clock_ns(vm_clock); | |
153 | bs->slice_end = bs->slice_start + bs->slice_time; | |
154 | memset(&bs->io_base, 0, sizeof(bs->io_base)); | |
155 | bs->io_limits_enabled = true; | |
156 | } | |
157 | ||
158 | bool bdrv_io_limits_enabled(BlockDriverState *bs) | |
159 | { | |
160 | BlockIOLimit *io_limits = &bs->io_limits; | |
161 | return io_limits->bps[BLOCK_IO_LIMIT_READ] | |
162 | || io_limits->bps[BLOCK_IO_LIMIT_WRITE] | |
163 | || io_limits->bps[BLOCK_IO_LIMIT_TOTAL] | |
164 | || io_limits->iops[BLOCK_IO_LIMIT_READ] | |
165 | || io_limits->iops[BLOCK_IO_LIMIT_WRITE] | |
166 | || io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; | |
167 | } | |
168 | ||
98f90dba ZYW |
169 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
170 | bool is_write, int nb_sectors) | |
171 | { | |
172 | int64_t wait_time = -1; | |
173 | ||
174 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
175 | qemu_co_queue_wait(&bs->throttled_reqs); | |
176 | } | |
177 | ||
178 | /* In fact, we hope to keep each request's timing, in FIFO mode. The next | |
179 | * throttled requests will not be dequeued until the current request is | |
180 | * allowed to be serviced. So if the current request still exceeds the | |
181 | * limits, it will be inserted to the head. All requests followed it will | |
182 | * be still in throttled_reqs queue. | |
183 | */ | |
184 | ||
185 | while (bdrv_exceed_io_limits(bs, nb_sectors, is_write, &wait_time)) { | |
186 | qemu_mod_timer(bs->block_timer, | |
187 | wait_time + qemu_get_clock_ns(vm_clock)); | |
188 | qemu_co_queue_wait_insert_head(&bs->throttled_reqs); | |
189 | } | |
190 | ||
191 | qemu_co_queue_next(&bs->throttled_reqs); | |
192 | } | |
193 | ||
9e0b22f4 SH |
194 | /* check if the path starts with "<protocol>:" */ |
195 | static int path_has_protocol(const char *path) | |
196 | { | |
197 | #ifdef _WIN32 | |
198 | if (is_windows_drive(path) || | |
199 | is_windows_drive_prefix(path)) { | |
200 | return 0; | |
201 | } | |
202 | #endif | |
203 | ||
204 | return strchr(path, ':') != NULL; | |
205 | } | |
206 | ||
83f64091 | 207 | int path_is_absolute(const char *path) |
3b0d4f61 | 208 | { |
83f64091 | 209 | const char *p; |
21664424 FB |
210 | #ifdef _WIN32 |
211 | /* specific case for names like: "\\.\d:" */ | |
212 | if (*path == '/' || *path == '\\') | |
213 | return 1; | |
214 | #endif | |
83f64091 FB |
215 | p = strchr(path, ':'); |
216 | if (p) | |
217 | p++; | |
218 | else | |
219 | p = path; | |
3b9f94e1 FB |
220 | #ifdef _WIN32 |
221 | return (*p == '/' || *p == '\\'); | |
222 | #else | |
223 | return (*p == '/'); | |
224 | #endif | |
3b0d4f61 FB |
225 | } |
226 | ||
83f64091 FB |
227 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
228 | path to it by considering it is relative to base_path. URL are | |
229 | supported. */ | |
230 | void path_combine(char *dest, int dest_size, | |
231 | const char *base_path, | |
232 | const char *filename) | |
3b0d4f61 | 233 | { |
83f64091 FB |
234 | const char *p, *p1; |
235 | int len; | |
236 | ||
237 | if (dest_size <= 0) | |
238 | return; | |
239 | if (path_is_absolute(filename)) { | |
240 | pstrcpy(dest, dest_size, filename); | |
241 | } else { | |
242 | p = strchr(base_path, ':'); | |
243 | if (p) | |
244 | p++; | |
245 | else | |
246 | p = base_path; | |
3b9f94e1 FB |
247 | p1 = strrchr(base_path, '/'); |
248 | #ifdef _WIN32 | |
249 | { | |
250 | const char *p2; | |
251 | p2 = strrchr(base_path, '\\'); | |
252 | if (!p1 || p2 > p1) | |
253 | p1 = p2; | |
254 | } | |
255 | #endif | |
83f64091 FB |
256 | if (p1) |
257 | p1++; | |
258 | else | |
259 | p1 = base_path; | |
260 | if (p1 > p) | |
261 | p = p1; | |
262 | len = p - base_path; | |
263 | if (len > dest_size - 1) | |
264 | len = dest_size - 1; | |
265 | memcpy(dest, base_path, len); | |
266 | dest[len] = '\0'; | |
267 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 268 | } |
3b0d4f61 FB |
269 | } |
270 | ||
5efa9d5a | 271 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 272 | { |
8c5873d6 SH |
273 | /* Block drivers without coroutine functions need emulation */ |
274 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
275 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
276 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
277 | ||
f8c35c1d SH |
278 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
279 | * the block driver lacks aio we need to emulate that too. | |
280 | */ | |
f9f05dc5 KW |
281 | if (!bdrv->bdrv_aio_readv) { |
282 | /* add AIO emulation layer */ | |
283 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
284 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 285 | } |
83f64091 | 286 | } |
b2e12bc6 | 287 | |
8a22f02a | 288 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 289 | } |
b338082b FB |
290 | |
291 | /* create a new block device (by default it is empty) */ | |
292 | BlockDriverState *bdrv_new(const char *device_name) | |
293 | { | |
1b7bdbc1 | 294 | BlockDriverState *bs; |
b338082b | 295 | |
7267c094 | 296 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 297 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 298 | if (device_name[0] != '\0') { |
1b7bdbc1 | 299 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 300 | } |
28a7282a | 301 | bdrv_iostatus_disable(bs); |
b338082b FB |
302 | return bs; |
303 | } | |
304 | ||
ea2384d3 FB |
305 | BlockDriver *bdrv_find_format(const char *format_name) |
306 | { | |
307 | BlockDriver *drv1; | |
8a22f02a SH |
308 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
309 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 310 | return drv1; |
8a22f02a | 311 | } |
ea2384d3 FB |
312 | } |
313 | return NULL; | |
314 | } | |
315 | ||
eb852011 MA |
316 | static int bdrv_is_whitelisted(BlockDriver *drv) |
317 | { | |
318 | static const char *whitelist[] = { | |
319 | CONFIG_BDRV_WHITELIST | |
320 | }; | |
321 | const char **p; | |
322 | ||
323 | if (!whitelist[0]) | |
324 | return 1; /* no whitelist, anything goes */ | |
325 | ||
326 | for (p = whitelist; *p; p++) { | |
327 | if (!strcmp(drv->format_name, *p)) { | |
328 | return 1; | |
329 | } | |
330 | } | |
331 | return 0; | |
332 | } | |
333 | ||
334 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
335 | { | |
336 | BlockDriver *drv = bdrv_find_format(format_name); | |
337 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
338 | } | |
339 | ||
0e7e1989 KW |
340 | int bdrv_create(BlockDriver *drv, const char* filename, |
341 | QEMUOptionParameter *options) | |
ea2384d3 FB |
342 | { |
343 | if (!drv->bdrv_create) | |
344 | return -ENOTSUP; | |
0e7e1989 KW |
345 | |
346 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
347 | } |
348 | ||
84a12e66 CH |
349 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
350 | { | |
351 | BlockDriver *drv; | |
352 | ||
b50cbabc | 353 | drv = bdrv_find_protocol(filename); |
84a12e66 | 354 | if (drv == NULL) { |
16905d71 | 355 | return -ENOENT; |
84a12e66 CH |
356 | } |
357 | ||
358 | return bdrv_create(drv, filename, options); | |
359 | } | |
360 | ||
d5249393 | 361 | #ifdef _WIN32 |
95389c86 | 362 | void get_tmp_filename(char *filename, int size) |
d5249393 | 363 | { |
3b9f94e1 | 364 | char temp_dir[MAX_PATH]; |
3b46e624 | 365 | |
3b9f94e1 FB |
366 | GetTempPath(MAX_PATH, temp_dir); |
367 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
368 | } |
369 | #else | |
95389c86 | 370 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 371 | { |
67b915a5 | 372 | int fd; |
7ccfb2eb | 373 | const char *tmpdir; |
d5249393 | 374 | /* XXX: race condition possible */ |
0badc1ee AJ |
375 | tmpdir = getenv("TMPDIR"); |
376 | if (!tmpdir) | |
377 | tmpdir = "/tmp"; | |
378 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
379 | fd = mkstemp(filename); |
380 | close(fd); | |
381 | } | |
d5249393 | 382 | #endif |
fc01f7e7 | 383 | |
84a12e66 CH |
384 | /* |
385 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
386 | * recognized as a host CDROM. | |
387 | */ | |
388 | static BlockDriver *find_hdev_driver(const char *filename) | |
389 | { | |
390 | int score_max = 0, score; | |
391 | BlockDriver *drv = NULL, *d; | |
392 | ||
393 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
394 | if (d->bdrv_probe_device) { | |
395 | score = d->bdrv_probe_device(filename); | |
396 | if (score > score_max) { | |
397 | score_max = score; | |
398 | drv = d; | |
399 | } | |
400 | } | |
401 | } | |
402 | ||
403 | return drv; | |
404 | } | |
405 | ||
b50cbabc | 406 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
407 | { |
408 | BlockDriver *drv1; | |
409 | char protocol[128]; | |
1cec71e3 | 410 | int len; |
83f64091 | 411 | const char *p; |
19cb3738 | 412 | |
66f82cee KW |
413 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
414 | ||
39508e7a CH |
415 | /* |
416 | * XXX(hch): we really should not let host device detection | |
417 | * override an explicit protocol specification, but moving this | |
418 | * later breaks access to device names with colons in them. | |
419 | * Thanks to the brain-dead persistent naming schemes on udev- | |
420 | * based Linux systems those actually are quite common. | |
421 | */ | |
422 | drv1 = find_hdev_driver(filename); | |
423 | if (drv1) { | |
424 | return drv1; | |
425 | } | |
426 | ||
9e0b22f4 | 427 | if (!path_has_protocol(filename)) { |
39508e7a | 428 | return bdrv_find_format("file"); |
84a12e66 | 429 | } |
9e0b22f4 SH |
430 | p = strchr(filename, ':'); |
431 | assert(p != NULL); | |
1cec71e3 AL |
432 | len = p - filename; |
433 | if (len > sizeof(protocol) - 1) | |
434 | len = sizeof(protocol) - 1; | |
435 | memcpy(protocol, filename, len); | |
436 | protocol[len] = '\0'; | |
8a22f02a | 437 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 438 | if (drv1->protocol_name && |
8a22f02a | 439 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 440 | return drv1; |
8a22f02a | 441 | } |
83f64091 FB |
442 | } |
443 | return NULL; | |
444 | } | |
445 | ||
c98ac35d | 446 | static int find_image_format(const char *filename, BlockDriver **pdrv) |
f3a5d3f8 CH |
447 | { |
448 | int ret, score, score_max; | |
449 | BlockDriver *drv1, *drv; | |
450 | uint8_t buf[2048]; | |
451 | BlockDriverState *bs; | |
452 | ||
f5edb014 | 453 | ret = bdrv_file_open(&bs, filename, 0); |
c98ac35d SW |
454 | if (ret < 0) { |
455 | *pdrv = NULL; | |
456 | return ret; | |
457 | } | |
f8ea0b00 | 458 | |
08a00559 KW |
459 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
460 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
1a396859 | 461 | bdrv_delete(bs); |
c98ac35d SW |
462 | drv = bdrv_find_format("raw"); |
463 | if (!drv) { | |
464 | ret = -ENOENT; | |
465 | } | |
466 | *pdrv = drv; | |
467 | return ret; | |
1a396859 | 468 | } |
f8ea0b00 | 469 | |
83f64091 FB |
470 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
471 | bdrv_delete(bs); | |
472 | if (ret < 0) { | |
c98ac35d SW |
473 | *pdrv = NULL; |
474 | return ret; | |
83f64091 FB |
475 | } |
476 | ||
ea2384d3 | 477 | score_max = 0; |
84a12e66 | 478 | drv = NULL; |
8a22f02a | 479 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
480 | if (drv1->bdrv_probe) { |
481 | score = drv1->bdrv_probe(buf, ret, filename); | |
482 | if (score > score_max) { | |
483 | score_max = score; | |
484 | drv = drv1; | |
485 | } | |
0849bf08 | 486 | } |
fc01f7e7 | 487 | } |
c98ac35d SW |
488 | if (!drv) { |
489 | ret = -ENOENT; | |
490 | } | |
491 | *pdrv = drv; | |
492 | return ret; | |
ea2384d3 FB |
493 | } |
494 | ||
51762288 SH |
495 | /** |
496 | * Set the current 'total_sectors' value | |
497 | */ | |
498 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
499 | { | |
500 | BlockDriver *drv = bs->drv; | |
501 | ||
396759ad NB |
502 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
503 | if (bs->sg) | |
504 | return 0; | |
505 | ||
51762288 SH |
506 | /* query actual device if possible, otherwise just trust the hint */ |
507 | if (drv->bdrv_getlength) { | |
508 | int64_t length = drv->bdrv_getlength(bs); | |
509 | if (length < 0) { | |
510 | return length; | |
511 | } | |
512 | hint = length >> BDRV_SECTOR_BITS; | |
513 | } | |
514 | ||
515 | bs->total_sectors = hint; | |
516 | return 0; | |
517 | } | |
518 | ||
c3993cdc SH |
519 | /** |
520 | * Set open flags for a given cache mode | |
521 | * | |
522 | * Return 0 on success, -1 if the cache mode was invalid. | |
523 | */ | |
524 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
525 | { | |
526 | *flags &= ~BDRV_O_CACHE_MASK; | |
527 | ||
528 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
529 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
530 | } else if (!strcmp(mode, "directsync")) { |
531 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
532 | } else if (!strcmp(mode, "writeback")) { |
533 | *flags |= BDRV_O_CACHE_WB; | |
534 | } else if (!strcmp(mode, "unsafe")) { | |
535 | *flags |= BDRV_O_CACHE_WB; | |
536 | *flags |= BDRV_O_NO_FLUSH; | |
537 | } else if (!strcmp(mode, "writethrough")) { | |
538 | /* this is the default */ | |
539 | } else { | |
540 | return -1; | |
541 | } | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
53fec9d3 SH |
546 | /** |
547 | * The copy-on-read flag is actually a reference count so multiple users may | |
548 | * use the feature without worrying about clobbering its previous state. | |
549 | * Copy-on-read stays enabled until all users have called to disable it. | |
550 | */ | |
551 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
552 | { | |
553 | bs->copy_on_read++; | |
554 | } | |
555 | ||
556 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
557 | { | |
558 | assert(bs->copy_on_read > 0); | |
559 | bs->copy_on_read--; | |
560 | } | |
561 | ||
57915332 KW |
562 | /* |
563 | * Common part for opening disk images and files | |
564 | */ | |
565 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
566 | int flags, BlockDriver *drv) | |
567 | { | |
568 | int ret, open_flags; | |
569 | ||
570 | assert(drv != NULL); | |
571 | ||
28dcee10 SH |
572 | trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
573 | ||
66f82cee | 574 | bs->file = NULL; |
51762288 | 575 | bs->total_sectors = 0; |
57915332 KW |
576 | bs->encrypted = 0; |
577 | bs->valid_key = 0; | |
03f541bd | 578 | bs->sg = 0; |
57915332 | 579 | bs->open_flags = flags; |
03f541bd | 580 | bs->growable = 0; |
57915332 KW |
581 | bs->buffer_alignment = 512; |
582 | ||
53fec9d3 SH |
583 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
584 | if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) { | |
585 | bdrv_enable_copy_on_read(bs); | |
586 | } | |
587 | ||
57915332 | 588 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
03f541bd | 589 | bs->backing_file[0] = '\0'; |
57915332 KW |
590 | |
591 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
592 | return -ENOTSUP; | |
593 | } | |
594 | ||
595 | bs->drv = drv; | |
7267c094 | 596 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 597 | |
03f541bd | 598 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
57915332 KW |
599 | |
600 | /* | |
601 | * Clear flags that are internal to the block layer before opening the | |
602 | * image. | |
603 | */ | |
604 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
605 | ||
606 | /* | |
ebabb67a | 607 | * Snapshots should be writable. |
57915332 KW |
608 | */ |
609 | if (bs->is_temporary) { | |
610 | open_flags |= BDRV_O_RDWR; | |
611 | } | |
612 | ||
e7c63796 SH |
613 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
614 | ||
66f82cee KW |
615 | /* Open the image, either directly or using a protocol */ |
616 | if (drv->bdrv_file_open) { | |
617 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
618 | } else { | |
619 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
620 | if (ret >= 0) { | |
621 | ret = drv->bdrv_open(bs, open_flags); | |
622 | } | |
623 | } | |
624 | ||
57915332 KW |
625 | if (ret < 0) { |
626 | goto free_and_fail; | |
627 | } | |
628 | ||
51762288 SH |
629 | ret = refresh_total_sectors(bs, bs->total_sectors); |
630 | if (ret < 0) { | |
631 | goto free_and_fail; | |
57915332 | 632 | } |
51762288 | 633 | |
57915332 KW |
634 | #ifndef _WIN32 |
635 | if (bs->is_temporary) { | |
636 | unlink(filename); | |
637 | } | |
638 | #endif | |
639 | return 0; | |
640 | ||
641 | free_and_fail: | |
66f82cee KW |
642 | if (bs->file) { |
643 | bdrv_delete(bs->file); | |
644 | bs->file = NULL; | |
645 | } | |
7267c094 | 646 | g_free(bs->opaque); |
57915332 KW |
647 | bs->opaque = NULL; |
648 | bs->drv = NULL; | |
649 | return ret; | |
650 | } | |
651 | ||
b6ce07aa KW |
652 | /* |
653 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
654 | */ | |
83f64091 | 655 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 656 | { |
83f64091 | 657 | BlockDriverState *bs; |
6db95603 | 658 | BlockDriver *drv; |
83f64091 FB |
659 | int ret; |
660 | ||
b50cbabc | 661 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
662 | if (!drv) { |
663 | return -ENOENT; | |
664 | } | |
665 | ||
83f64091 | 666 | bs = bdrv_new(""); |
b6ce07aa | 667 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
668 | if (ret < 0) { |
669 | bdrv_delete(bs); | |
670 | return ret; | |
3b0d4f61 | 671 | } |
71d0770c | 672 | bs->growable = 1; |
83f64091 FB |
673 | *pbs = bs; |
674 | return 0; | |
675 | } | |
676 | ||
b6ce07aa KW |
677 | /* |
678 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
679 | */ | |
d6e9098e KW |
680 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
681 | BlockDriver *drv) | |
ea2384d3 | 682 | { |
b6ce07aa | 683 | int ret; |
2b572816 | 684 | char tmp_filename[PATH_MAX]; |
712e7874 | 685 | |
83f64091 | 686 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
687 | BlockDriverState *bs1; |
688 | int64_t total_size; | |
7c96d46e | 689 | int is_protocol = 0; |
91a073a9 KW |
690 | BlockDriver *bdrv_qcow2; |
691 | QEMUOptionParameter *options; | |
b6ce07aa | 692 | char backing_filename[PATH_MAX]; |
3b46e624 | 693 | |
ea2384d3 FB |
694 | /* if snapshot, we create a temporary backing file and open it |
695 | instead of opening 'filename' directly */ | |
33e3963e | 696 | |
ea2384d3 FB |
697 | /* if there is a backing file, use it */ |
698 | bs1 = bdrv_new(""); | |
d6e9098e | 699 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 700 | if (ret < 0) { |
ea2384d3 | 701 | bdrv_delete(bs1); |
51d7c00c | 702 | return ret; |
ea2384d3 | 703 | } |
3e82990b | 704 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
705 | |
706 | if (bs1->drv && bs1->drv->protocol_name) | |
707 | is_protocol = 1; | |
708 | ||
ea2384d3 | 709 | bdrv_delete(bs1); |
3b46e624 | 710 | |
ea2384d3 | 711 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
712 | |
713 | /* Real path is meaningless for protocols */ | |
714 | if (is_protocol) | |
715 | snprintf(backing_filename, sizeof(backing_filename), | |
716 | "%s", filename); | |
114cdfa9 KS |
717 | else if (!realpath(filename, backing_filename)) |
718 | return -errno; | |
7c96d46e | 719 | |
91a073a9 KW |
720 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
721 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
722 | ||
3e82990b | 723 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
724 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
725 | if (drv) { | |
726 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
727 | drv->format_name); | |
728 | } | |
729 | ||
730 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 731 | free_option_parameters(options); |
51d7c00c AL |
732 | if (ret < 0) { |
733 | return ret; | |
ea2384d3 | 734 | } |
91a073a9 | 735 | |
ea2384d3 | 736 | filename = tmp_filename; |
91a073a9 | 737 | drv = bdrv_qcow2; |
ea2384d3 FB |
738 | bs->is_temporary = 1; |
739 | } | |
712e7874 | 740 | |
b6ce07aa | 741 | /* Find the right image format driver */ |
6db95603 | 742 | if (!drv) { |
c98ac35d | 743 | ret = find_image_format(filename, &drv); |
51d7c00c | 744 | } |
6987307c | 745 | |
51d7c00c | 746 | if (!drv) { |
51d7c00c | 747 | goto unlink_and_fail; |
ea2384d3 | 748 | } |
b6ce07aa KW |
749 | |
750 | /* Open the image */ | |
751 | ret = bdrv_open_common(bs, filename, flags, drv); | |
752 | if (ret < 0) { | |
6987307c CH |
753 | goto unlink_and_fail; |
754 | } | |
755 | ||
b6ce07aa KW |
756 | /* If there is a backing file, use it */ |
757 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
758 | char backing_filename[PATH_MAX]; | |
759 | int back_flags; | |
760 | BlockDriver *back_drv = NULL; | |
761 | ||
762 | bs->backing_hd = bdrv_new(""); | |
df2dbb4a SH |
763 | |
764 | if (path_has_protocol(bs->backing_file)) { | |
765 | pstrcpy(backing_filename, sizeof(backing_filename), | |
766 | bs->backing_file); | |
767 | } else { | |
768 | path_combine(backing_filename, sizeof(backing_filename), | |
769 | filename, bs->backing_file); | |
770 | } | |
771 | ||
772 | if (bs->backing_format[0] != '\0') { | |
b6ce07aa | 773 | back_drv = bdrv_find_format(bs->backing_format); |
df2dbb4a | 774 | } |
b6ce07aa KW |
775 | |
776 | /* backing files always opened read-only */ | |
777 | back_flags = | |
778 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
779 | ||
780 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
781 | if (ret < 0) { | |
782 | bdrv_close(bs); | |
783 | return ret; | |
784 | } | |
785 | if (bs->is_temporary) { | |
786 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
787 | } else { | |
788 | /* base image inherits from "parent" */ | |
789 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
790 | } | |
791 | } | |
792 | ||
793 | if (!bdrv_key_required(bs)) { | |
7d4b4ba5 | 794 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
795 | } |
796 | ||
98f90dba ZYW |
797 | /* throttling disk I/O limits */ |
798 | if (bs->io_limits_enabled) { | |
799 | bdrv_io_limits_enable(bs); | |
800 | } | |
801 | ||
b6ce07aa KW |
802 | return 0; |
803 | ||
804 | unlink_and_fail: | |
805 | if (bs->is_temporary) { | |
806 | unlink(filename); | |
807 | } | |
808 | return ret; | |
809 | } | |
810 | ||
fc01f7e7 FB |
811 | void bdrv_close(BlockDriverState *bs) |
812 | { | |
19cb3738 | 813 | if (bs->drv) { |
f9092b10 MA |
814 | if (bs == bs_snapshots) { |
815 | bs_snapshots = NULL; | |
816 | } | |
557df6ac | 817 | if (bs->backing_hd) { |
ea2384d3 | 818 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
819 | bs->backing_hd = NULL; |
820 | } | |
ea2384d3 | 821 | bs->drv->bdrv_close(bs); |
7267c094 | 822 | g_free(bs->opaque); |
ea2384d3 FB |
823 | #ifdef _WIN32 |
824 | if (bs->is_temporary) { | |
825 | unlink(bs->filename); | |
826 | } | |
67b915a5 | 827 | #endif |
ea2384d3 FB |
828 | bs->opaque = NULL; |
829 | bs->drv = NULL; | |
53fec9d3 | 830 | bs->copy_on_read = 0; |
b338082b | 831 | |
66f82cee KW |
832 | if (bs->file != NULL) { |
833 | bdrv_close(bs->file); | |
834 | } | |
835 | ||
7d4b4ba5 | 836 | bdrv_dev_change_media_cb(bs, false); |
b338082b | 837 | } |
98f90dba ZYW |
838 | |
839 | /*throttling disk I/O limits*/ | |
840 | if (bs->io_limits_enabled) { | |
841 | bdrv_io_limits_disable(bs); | |
842 | } | |
b338082b FB |
843 | } |
844 | ||
2bc93fed MK |
845 | void bdrv_close_all(void) |
846 | { | |
847 | BlockDriverState *bs; | |
848 | ||
849 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
850 | bdrv_close(bs); | |
851 | } | |
852 | } | |
853 | ||
922453bc SH |
854 | /* |
855 | * Wait for pending requests to complete across all BlockDriverStates | |
856 | * | |
857 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
858 | * after calling this function. | |
859 | */ | |
860 | void bdrv_drain_all(void) | |
861 | { | |
862 | BlockDriverState *bs; | |
863 | ||
864 | qemu_aio_flush(); | |
865 | ||
866 | /* If requests are still pending there is a bug somewhere */ | |
867 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
868 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
869 | assert(qemu_co_queue_empty(&bs->throttled_reqs)); | |
870 | } | |
871 | } | |
872 | ||
d22b2f41 RH |
873 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
874 | Also, NULL terminate the device_name to prevent double remove */ | |
875 | void bdrv_make_anon(BlockDriverState *bs) | |
876 | { | |
877 | if (bs->device_name[0] != '\0') { | |
878 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
879 | } | |
880 | bs->device_name[0] = '\0'; | |
881 | } | |
882 | ||
b338082b FB |
883 | void bdrv_delete(BlockDriverState *bs) |
884 | { | |
fa879d62 | 885 | assert(!bs->dev); |
18846dee | 886 | |
1b7bdbc1 | 887 | /* remove from list, if necessary */ |
d22b2f41 | 888 | bdrv_make_anon(bs); |
34c6f050 | 889 | |
b338082b | 890 | bdrv_close(bs); |
66f82cee KW |
891 | if (bs->file != NULL) { |
892 | bdrv_delete(bs->file); | |
893 | } | |
894 | ||
f9092b10 | 895 | assert(bs != bs_snapshots); |
7267c094 | 896 | g_free(bs); |
fc01f7e7 FB |
897 | } |
898 | ||
fa879d62 MA |
899 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
900 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 901 | { |
fa879d62 | 902 | if (bs->dev) { |
18846dee MA |
903 | return -EBUSY; |
904 | } | |
fa879d62 | 905 | bs->dev = dev; |
28a7282a | 906 | bdrv_iostatus_reset(bs); |
18846dee MA |
907 | return 0; |
908 | } | |
909 | ||
fa879d62 MA |
910 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
911 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 912 | { |
fa879d62 MA |
913 | if (bdrv_attach_dev(bs, dev) < 0) { |
914 | abort(); | |
915 | } | |
916 | } | |
917 | ||
918 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
919 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
920 | { | |
921 | assert(bs->dev == dev); | |
922 | bs->dev = NULL; | |
0e49de52 MA |
923 | bs->dev_ops = NULL; |
924 | bs->dev_opaque = NULL; | |
29e05f20 | 925 | bs->buffer_alignment = 512; |
18846dee MA |
926 | } |
927 | ||
fa879d62 MA |
928 | /* TODO change to return DeviceState * when all users are qdevified */ |
929 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 930 | { |
fa879d62 | 931 | return bs->dev; |
18846dee MA |
932 | } |
933 | ||
0e49de52 MA |
934 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
935 | void *opaque) | |
936 | { | |
937 | bs->dev_ops = ops; | |
938 | bs->dev_opaque = opaque; | |
2c6942fa MA |
939 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
940 | bs_snapshots = NULL; | |
941 | } | |
0e49de52 MA |
942 | } |
943 | ||
7d4b4ba5 | 944 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 945 | { |
145feb17 | 946 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
7d4b4ba5 | 947 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
145feb17 MA |
948 | } |
949 | } | |
950 | ||
2c6942fa MA |
951 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
952 | { | |
953 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
954 | } | |
955 | ||
025ccaa7 PB |
956 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
957 | { | |
958 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
959 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
960 | } | |
961 | } | |
962 | ||
e4def80b MA |
963 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
964 | { | |
965 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
966 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
967 | } | |
968 | return false; | |
969 | } | |
970 | ||
145feb17 MA |
971 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
972 | { | |
973 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
974 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
975 | } |
976 | } | |
977 | ||
f107639a MA |
978 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
979 | { | |
980 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
981 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
982 | } | |
983 | return false; | |
984 | } | |
985 | ||
e97fc193 AL |
986 | /* |
987 | * Run consistency checks on an image | |
988 | * | |
e076f338 | 989 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 990 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 991 | * check are stored in res. |
e97fc193 | 992 | */ |
e076f338 | 993 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) |
e97fc193 AL |
994 | { |
995 | if (bs->drv->bdrv_check == NULL) { | |
996 | return -ENOTSUP; | |
997 | } | |
998 | ||
e076f338 | 999 | memset(res, 0, sizeof(*res)); |
9ac228e0 | 1000 | return bs->drv->bdrv_check(bs, res); |
e97fc193 AL |
1001 | } |
1002 | ||
8a426614 KW |
1003 | #define COMMIT_BUF_SECTORS 2048 |
1004 | ||
33e3963e FB |
1005 | /* commit COW file into the raw image */ |
1006 | int bdrv_commit(BlockDriverState *bs) | |
1007 | { | |
19cb3738 | 1008 | BlockDriver *drv = bs->drv; |
ee181196 | 1009 | BlockDriver *backing_drv; |
8a426614 KW |
1010 | int64_t sector, total_sectors; |
1011 | int n, ro, open_flags; | |
4dca4b63 | 1012 | int ret = 0, rw_ret = 0; |
8a426614 | 1013 | uint8_t *buf; |
4dca4b63 NS |
1014 | char filename[1024]; |
1015 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 1016 | |
19cb3738 FB |
1017 | if (!drv) |
1018 | return -ENOMEDIUM; | |
4dca4b63 NS |
1019 | |
1020 | if (!bs->backing_hd) { | |
1021 | return -ENOTSUP; | |
33e3963e FB |
1022 | } |
1023 | ||
4dca4b63 NS |
1024 | if (bs->backing_hd->keep_read_only) { |
1025 | return -EACCES; | |
1026 | } | |
ee181196 | 1027 | |
2d3735d3 SH |
1028 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1029 | return -EBUSY; | |
1030 | } | |
1031 | ||
ee181196 | 1032 | backing_drv = bs->backing_hd->drv; |
4dca4b63 NS |
1033 | ro = bs->backing_hd->read_only; |
1034 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
1035 | open_flags = bs->backing_hd->open_flags; | |
1036 | ||
1037 | if (ro) { | |
1038 | /* re-open as RW */ | |
1039 | bdrv_delete(bs->backing_hd); | |
1040 | bs->backing_hd = NULL; | |
1041 | bs_rw = bdrv_new(""); | |
ee181196 KW |
1042 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
1043 | backing_drv); | |
4dca4b63 NS |
1044 | if (rw_ret < 0) { |
1045 | bdrv_delete(bs_rw); | |
1046 | /* try to re-open read-only */ | |
1047 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1048 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1049 | backing_drv); | |
4dca4b63 NS |
1050 | if (ret < 0) { |
1051 | bdrv_delete(bs_ro); | |
1052 | /* drive not functional anymore */ | |
1053 | bs->drv = NULL; | |
1054 | return ret; | |
1055 | } | |
1056 | bs->backing_hd = bs_ro; | |
1057 | return rw_ret; | |
1058 | } | |
1059 | bs->backing_hd = bs_rw; | |
ea2384d3 | 1060 | } |
33e3963e | 1061 | |
6ea44308 | 1062 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1063 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1064 | |
1065 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1066 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1067 | |
1068 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1069 | ret = -EIO; | |
1070 | goto ro_cleanup; | |
1071 | } | |
1072 | ||
1073 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1074 | ret = -EIO; | |
1075 | goto ro_cleanup; | |
1076 | } | |
ea2384d3 | 1077 | } |
33e3963e | 1078 | } |
95389c86 | 1079 | |
1d44952f CH |
1080 | if (drv->bdrv_make_empty) { |
1081 | ret = drv->bdrv_make_empty(bs); | |
1082 | bdrv_flush(bs); | |
1083 | } | |
95389c86 | 1084 | |
3f5075ae CH |
1085 | /* |
1086 | * Make sure all data we wrote to the backing device is actually | |
1087 | * stable on disk. | |
1088 | */ | |
1089 | if (bs->backing_hd) | |
1090 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1091 | |
1092 | ro_cleanup: | |
7267c094 | 1093 | g_free(buf); |
4dca4b63 NS |
1094 | |
1095 | if (ro) { | |
1096 | /* re-open as RO */ | |
1097 | bdrv_delete(bs->backing_hd); | |
1098 | bs->backing_hd = NULL; | |
1099 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1100 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1101 | backing_drv); | |
4dca4b63 NS |
1102 | if (ret < 0) { |
1103 | bdrv_delete(bs_ro); | |
1104 | /* drive not functional anymore */ | |
1105 | bs->drv = NULL; | |
1106 | return ret; | |
1107 | } | |
1108 | bs->backing_hd = bs_ro; | |
1109 | bs->backing_hd->keep_read_only = 0; | |
1110 | } | |
1111 | ||
1d44952f | 1112 | return ret; |
33e3963e FB |
1113 | } |
1114 | ||
6ab4b5ab MA |
1115 | void bdrv_commit_all(void) |
1116 | { | |
1117 | BlockDriverState *bs; | |
1118 | ||
1119 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1120 | bdrv_commit(bs); | |
1121 | } | |
1122 | } | |
1123 | ||
dbffbdcf SH |
1124 | struct BdrvTrackedRequest { |
1125 | BlockDriverState *bs; | |
1126 | int64_t sector_num; | |
1127 | int nb_sectors; | |
1128 | bool is_write; | |
1129 | QLIST_ENTRY(BdrvTrackedRequest) list; | |
5f8b6491 | 1130 | Coroutine *co; /* owner, used for deadlock detection */ |
f4658285 | 1131 | CoQueue wait_queue; /* coroutines blocked on this request */ |
dbffbdcf SH |
1132 | }; |
1133 | ||
1134 | /** | |
1135 | * Remove an active request from the tracked requests list | |
1136 | * | |
1137 | * This function should be called when a tracked request is completing. | |
1138 | */ | |
1139 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1140 | { | |
1141 | QLIST_REMOVE(req, list); | |
f4658285 | 1142 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1143 | } |
1144 | ||
1145 | /** | |
1146 | * Add an active request to the tracked requests list | |
1147 | */ | |
1148 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1149 | BlockDriverState *bs, | |
1150 | int64_t sector_num, | |
1151 | int nb_sectors, bool is_write) | |
1152 | { | |
1153 | *req = (BdrvTrackedRequest){ | |
1154 | .bs = bs, | |
1155 | .sector_num = sector_num, | |
1156 | .nb_sectors = nb_sectors, | |
1157 | .is_write = is_write, | |
5f8b6491 | 1158 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1159 | }; |
1160 | ||
f4658285 SH |
1161 | qemu_co_queue_init(&req->wait_queue); |
1162 | ||
dbffbdcf SH |
1163 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1164 | } | |
1165 | ||
d83947ac SH |
1166 | /** |
1167 | * Round a region to cluster boundaries | |
1168 | */ | |
1169 | static void round_to_clusters(BlockDriverState *bs, | |
1170 | int64_t sector_num, int nb_sectors, | |
1171 | int64_t *cluster_sector_num, | |
1172 | int *cluster_nb_sectors) | |
1173 | { | |
1174 | BlockDriverInfo bdi; | |
1175 | ||
1176 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1177 | *cluster_sector_num = sector_num; | |
1178 | *cluster_nb_sectors = nb_sectors; | |
1179 | } else { | |
1180 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1181 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1182 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1183 | nb_sectors, c); | |
1184 | } | |
1185 | } | |
1186 | ||
f4658285 SH |
1187 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1188 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1189 | /* aaaa bbbb */ |
1190 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1191 | return false; | |
1192 | } | |
1193 | /* bbbb aaaa */ | |
1194 | if (req->sector_num >= sector_num + nb_sectors) { | |
1195 | return false; | |
1196 | } | |
1197 | return true; | |
f4658285 SH |
1198 | } |
1199 | ||
1200 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1201 | int64_t sector_num, int nb_sectors) | |
1202 | { | |
1203 | BdrvTrackedRequest *req; | |
d83947ac SH |
1204 | int64_t cluster_sector_num; |
1205 | int cluster_nb_sectors; | |
f4658285 SH |
1206 | bool retry; |
1207 | ||
d83947ac SH |
1208 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1209 | * that allocating writes will be serialized and not race with each other | |
1210 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1211 | * CoR read and write operations are atomic and guest writes cannot | |
1212 | * interleave between them. | |
1213 | */ | |
1214 | round_to_clusters(bs, sector_num, nb_sectors, | |
1215 | &cluster_sector_num, &cluster_nb_sectors); | |
1216 | ||
f4658285 SH |
1217 | do { |
1218 | retry = false; | |
1219 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1220 | if (tracked_request_overlaps(req, cluster_sector_num, |
1221 | cluster_nb_sectors)) { | |
5f8b6491 SH |
1222 | /* Hitting this means there was a reentrant request, for |
1223 | * example, a block driver issuing nested requests. This must | |
1224 | * never happen since it means deadlock. | |
1225 | */ | |
1226 | assert(qemu_coroutine_self() != req->co); | |
1227 | ||
f4658285 SH |
1228 | qemu_co_queue_wait(&req->wait_queue); |
1229 | retry = true; | |
1230 | break; | |
1231 | } | |
1232 | } | |
1233 | } while (retry); | |
1234 | } | |
1235 | ||
756e6736 KW |
1236 | /* |
1237 | * Return values: | |
1238 | * 0 - success | |
1239 | * -EINVAL - backing format specified, but no file | |
1240 | * -ENOSPC - can't update the backing file because no space is left in the | |
1241 | * image file header | |
1242 | * -ENOTSUP - format driver doesn't support changing the backing file | |
1243 | */ | |
1244 | int bdrv_change_backing_file(BlockDriverState *bs, | |
1245 | const char *backing_file, const char *backing_fmt) | |
1246 | { | |
1247 | BlockDriver *drv = bs->drv; | |
1248 | ||
1249 | if (drv->bdrv_change_backing_file != NULL) { | |
1250 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
1251 | } else { | |
1252 | return -ENOTSUP; | |
1253 | } | |
1254 | } | |
1255 | ||
71d0770c AL |
1256 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1257 | size_t size) | |
1258 | { | |
1259 | int64_t len; | |
1260 | ||
1261 | if (!bdrv_is_inserted(bs)) | |
1262 | return -ENOMEDIUM; | |
1263 | ||
1264 | if (bs->growable) | |
1265 | return 0; | |
1266 | ||
1267 | len = bdrv_getlength(bs); | |
1268 | ||
fbb7b4e0 KW |
1269 | if (offset < 0) |
1270 | return -EIO; | |
1271 | ||
1272 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
1273 | return -EIO; |
1274 | ||
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
1279 | int nb_sectors) | |
1280 | { | |
eb5a3165 JS |
1281 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
1282 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
1283 | } |
1284 | ||
1c9805a3 SH |
1285 | typedef struct RwCo { |
1286 | BlockDriverState *bs; | |
1287 | int64_t sector_num; | |
1288 | int nb_sectors; | |
1289 | QEMUIOVector *qiov; | |
1290 | bool is_write; | |
1291 | int ret; | |
1292 | } RwCo; | |
1293 | ||
1294 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 1295 | { |
1c9805a3 | 1296 | RwCo *rwco = opaque; |
ea2384d3 | 1297 | |
1c9805a3 SH |
1298 | if (!rwco->is_write) { |
1299 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
470c0504 | 1300 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1301 | } else { |
1302 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
1303 | rwco->nb_sectors, rwco->qiov); | |
1304 | } | |
1305 | } | |
e7a8a783 | 1306 | |
1c9805a3 SH |
1307 | /* |
1308 | * Process a synchronous request using coroutines | |
1309 | */ | |
1310 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
1311 | int nb_sectors, bool is_write) | |
1312 | { | |
1313 | QEMUIOVector qiov; | |
1314 | struct iovec iov = { | |
1315 | .iov_base = (void *)buf, | |
1316 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1317 | }; | |
1318 | Coroutine *co; | |
1319 | RwCo rwco = { | |
1320 | .bs = bs, | |
1321 | .sector_num = sector_num, | |
1322 | .nb_sectors = nb_sectors, | |
1323 | .qiov = &qiov, | |
1324 | .is_write = is_write, | |
1325 | .ret = NOT_DONE, | |
1326 | }; | |
e7a8a783 | 1327 | |
1c9805a3 | 1328 | qemu_iovec_init_external(&qiov, &iov, 1); |
e7a8a783 | 1329 | |
1c9805a3 SH |
1330 | if (qemu_in_coroutine()) { |
1331 | /* Fast-path if already in coroutine context */ | |
1332 | bdrv_rw_co_entry(&rwco); | |
1333 | } else { | |
1334 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
1335 | qemu_coroutine_enter(co, &rwco); | |
1336 | while (rwco.ret == NOT_DONE) { | |
1337 | qemu_aio_wait(); | |
1338 | } | |
1339 | } | |
1340 | return rwco.ret; | |
1341 | } | |
b338082b | 1342 | |
1c9805a3 SH |
1343 | /* return < 0 if error. See bdrv_write() for the return codes */ |
1344 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
1345 | uint8_t *buf, int nb_sectors) | |
1346 | { | |
1347 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
fc01f7e7 FB |
1348 | } |
1349 | ||
7cd1e32a | 1350 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 1351 | int nb_sectors, int dirty) |
7cd1e32a LS |
1352 | { |
1353 | int64_t start, end; | |
c6d22830 | 1354 | unsigned long val, idx, bit; |
a55eb92c | 1355 | |
6ea44308 | 1356 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 1357 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
1358 | |
1359 | for (; start <= end; start++) { | |
c6d22830 JK |
1360 | idx = start / (sizeof(unsigned long) * 8); |
1361 | bit = start % (sizeof(unsigned long) * 8); | |
1362 | val = bs->dirty_bitmap[idx]; | |
1363 | if (dirty) { | |
6d59fec1 | 1364 | if (!(val & (1UL << bit))) { |
aaa0eb75 | 1365 | bs->dirty_count++; |
6d59fec1 | 1366 | val |= 1UL << bit; |
aaa0eb75 | 1367 | } |
c6d22830 | 1368 | } else { |
6d59fec1 | 1369 | if (val & (1UL << bit)) { |
aaa0eb75 | 1370 | bs->dirty_count--; |
6d59fec1 | 1371 | val &= ~(1UL << bit); |
aaa0eb75 | 1372 | } |
c6d22830 JK |
1373 | } |
1374 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a LS |
1375 | } |
1376 | } | |
1377 | ||
5fafdf24 | 1378 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
1379 | -EIO generic I/O error (may happen for all errors) |
1380 | -ENOMEDIUM No media inserted. | |
1381 | -EINVAL Invalid sector number or nb_sectors | |
1382 | -EACCES Trying to write a read-only device | |
1383 | */ | |
5fafdf24 | 1384 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
1385 | const uint8_t *buf, int nb_sectors) |
1386 | { | |
1c9805a3 | 1387 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
83f64091 FB |
1388 | } |
1389 | ||
eda578e5 AL |
1390 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
1391 | void *buf, int count1) | |
83f64091 | 1392 | { |
6ea44308 | 1393 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1394 | int len, nb_sectors, count; |
1395 | int64_t sector_num; | |
9a8c4cce | 1396 | int ret; |
83f64091 FB |
1397 | |
1398 | count = count1; | |
1399 | /* first read to align to sector start */ | |
6ea44308 | 1400 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1401 | if (len > count) |
1402 | len = count; | |
6ea44308 | 1403 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1404 | if (len > 0) { |
9a8c4cce KW |
1405 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1406 | return ret; | |
6ea44308 | 1407 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
1408 | count -= len; |
1409 | if (count == 0) | |
1410 | return count1; | |
1411 | sector_num++; | |
1412 | buf += len; | |
1413 | } | |
1414 | ||
1415 | /* read the sectors "in place" */ | |
6ea44308 | 1416 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1417 | if (nb_sectors > 0) { |
9a8c4cce KW |
1418 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1419 | return ret; | |
83f64091 | 1420 | sector_num += nb_sectors; |
6ea44308 | 1421 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1422 | buf += len; |
1423 | count -= len; | |
1424 | } | |
1425 | ||
1426 | /* add data from the last sector */ | |
1427 | if (count > 0) { | |
9a8c4cce KW |
1428 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1429 | return ret; | |
83f64091 FB |
1430 | memcpy(buf, tmp_buf, count); |
1431 | } | |
1432 | return count1; | |
1433 | } | |
1434 | ||
eda578e5 AL |
1435 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
1436 | const void *buf, int count1) | |
83f64091 | 1437 | { |
6ea44308 | 1438 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1439 | int len, nb_sectors, count; |
1440 | int64_t sector_num; | |
9a8c4cce | 1441 | int ret; |
83f64091 FB |
1442 | |
1443 | count = count1; | |
1444 | /* first write to align to sector start */ | |
6ea44308 | 1445 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1446 | if (len > count) |
1447 | len = count; | |
6ea44308 | 1448 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1449 | if (len > 0) { |
9a8c4cce KW |
1450 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1451 | return ret; | |
6ea44308 | 1452 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1453 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1454 | return ret; | |
83f64091 FB |
1455 | count -= len; |
1456 | if (count == 0) | |
1457 | return count1; | |
1458 | sector_num++; | |
1459 | buf += len; | |
1460 | } | |
1461 | ||
1462 | /* write the sectors "in place" */ | |
6ea44308 | 1463 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1464 | if (nb_sectors > 0) { |
9a8c4cce KW |
1465 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1466 | return ret; | |
83f64091 | 1467 | sector_num += nb_sectors; |
6ea44308 | 1468 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1469 | buf += len; |
1470 | count -= len; | |
1471 | } | |
1472 | ||
1473 | /* add data from the last sector */ | |
1474 | if (count > 0) { | |
9a8c4cce KW |
1475 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1476 | return ret; | |
83f64091 | 1477 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1478 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1479 | return ret; | |
83f64091 FB |
1480 | } |
1481 | return count1; | |
1482 | } | |
83f64091 | 1483 | |
f08145fe KW |
1484 | /* |
1485 | * Writes to the file and ensures that no writes are reordered across this | |
1486 | * request (acts as a barrier) | |
1487 | * | |
1488 | * Returns 0 on success, -errno in error cases. | |
1489 | */ | |
1490 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1491 | const void *buf, int count) | |
1492 | { | |
1493 | int ret; | |
1494 | ||
1495 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1496 | if (ret < 0) { | |
1497 | return ret; | |
1498 | } | |
1499 | ||
92196b2f SH |
1500 | /* No flush needed for cache modes that use O_DSYNC */ |
1501 | if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { | |
f08145fe KW |
1502 | bdrv_flush(bs); |
1503 | } | |
1504 | ||
1505 | return 0; | |
1506 | } | |
1507 | ||
470c0504 | 1508 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
1509 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
1510 | { | |
1511 | /* Perform I/O through a temporary buffer so that users who scribble over | |
1512 | * their read buffer while the operation is in progress do not end up | |
1513 | * modifying the image file. This is critical for zero-copy guest I/O | |
1514 | * where anything might happen inside guest memory. | |
1515 | */ | |
1516 | void *bounce_buffer; | |
1517 | ||
1518 | struct iovec iov; | |
1519 | QEMUIOVector bounce_qiov; | |
1520 | int64_t cluster_sector_num; | |
1521 | int cluster_nb_sectors; | |
1522 | size_t skip_bytes; | |
1523 | int ret; | |
1524 | ||
1525 | /* Cover entire cluster so no additional backing file I/O is required when | |
1526 | * allocating cluster in the image file. | |
1527 | */ | |
1528 | round_to_clusters(bs, sector_num, nb_sectors, | |
1529 | &cluster_sector_num, &cluster_nb_sectors); | |
1530 | ||
470c0504 SH |
1531 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
1532 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
1533 | |
1534 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
1535 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
1536 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
1537 | ||
1538 | ret = bs->drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, | |
1539 | &bounce_qiov); | |
1540 | if (ret < 0) { | |
1541 | goto err; | |
1542 | } | |
1543 | ||
1544 | ret = bs->drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, | |
1545 | &bounce_qiov); | |
1546 | if (ret < 0) { | |
1547 | /* It might be okay to ignore write errors for guest requests. If this | |
1548 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
1549 | * Simply report it in all cases. | |
1550 | */ | |
1551 | goto err; | |
1552 | } | |
1553 | ||
1554 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
1555 | qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, | |
1556 | nb_sectors * BDRV_SECTOR_SIZE); | |
1557 | ||
1558 | err: | |
1559 | qemu_vfree(bounce_buffer); | |
1560 | return ret; | |
1561 | } | |
1562 | ||
c5fbe571 SH |
1563 | /* |
1564 | * Handle a read request in coroutine context | |
1565 | */ | |
1566 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
1567 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
1568 | BdrvRequestFlags flags) | |
da1fa91d KW |
1569 | { |
1570 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
1571 | BdrvTrackedRequest req; |
1572 | int ret; | |
da1fa91d | 1573 | |
da1fa91d KW |
1574 | if (!drv) { |
1575 | return -ENOMEDIUM; | |
1576 | } | |
1577 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1578 | return -EIO; | |
1579 | } | |
1580 | ||
98f90dba ZYW |
1581 | /* throttling disk read I/O */ |
1582 | if (bs->io_limits_enabled) { | |
1583 | bdrv_io_limits_intercept(bs, false, nb_sectors); | |
1584 | } | |
1585 | ||
f4658285 | 1586 | if (bs->copy_on_read) { |
470c0504 SH |
1587 | flags |= BDRV_REQ_COPY_ON_READ; |
1588 | } | |
1589 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1590 | bs->copy_on_read_in_flight++; | |
1591 | } | |
1592 | ||
1593 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
1594 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1595 | } | |
1596 | ||
dbffbdcf | 1597 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 1598 | |
470c0504 | 1599 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
1600 | int pnum; |
1601 | ||
1602 | ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); | |
1603 | if (ret < 0) { | |
1604 | goto out; | |
1605 | } | |
1606 | ||
1607 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 1608 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1609 | goto out; |
1610 | } | |
1611 | } | |
1612 | ||
dbffbdcf | 1613 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1614 | |
1615 | out: | |
dbffbdcf | 1616 | tracked_request_end(&req); |
470c0504 SH |
1617 | |
1618 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1619 | bs->copy_on_read_in_flight--; | |
1620 | } | |
1621 | ||
dbffbdcf | 1622 | return ret; |
da1fa91d KW |
1623 | } |
1624 | ||
c5fbe571 | 1625 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
1626 | int nb_sectors, QEMUIOVector *qiov) |
1627 | { | |
c5fbe571 | 1628 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 1629 | |
470c0504 SH |
1630 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
1631 | } | |
1632 | ||
1633 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
1634 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1635 | { | |
1636 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
1637 | ||
1638 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
1639 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
1640 | } |
1641 | ||
1642 | /* | |
1643 | * Handle a write request in coroutine context | |
1644 | */ | |
1645 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
1646 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1647 | { | |
1648 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 1649 | BdrvTrackedRequest req; |
6b7cb247 | 1650 | int ret; |
da1fa91d KW |
1651 | |
1652 | if (!bs->drv) { | |
1653 | return -ENOMEDIUM; | |
1654 | } | |
1655 | if (bs->read_only) { | |
1656 | return -EACCES; | |
1657 | } | |
1658 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1659 | return -EIO; | |
1660 | } | |
1661 | ||
98f90dba ZYW |
1662 | /* throttling disk write I/O */ |
1663 | if (bs->io_limits_enabled) { | |
1664 | bdrv_io_limits_intercept(bs, true, nb_sectors); | |
1665 | } | |
1666 | ||
470c0504 | 1667 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
1668 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1669 | } | |
1670 | ||
dbffbdcf SH |
1671 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
1672 | ||
6b7cb247 SH |
1673 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
1674 | ||
da1fa91d KW |
1675 | if (bs->dirty_bitmap) { |
1676 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1677 | } | |
1678 | ||
1679 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1680 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1681 | } | |
1682 | ||
dbffbdcf SH |
1683 | tracked_request_end(&req); |
1684 | ||
6b7cb247 | 1685 | return ret; |
da1fa91d KW |
1686 | } |
1687 | ||
c5fbe571 SH |
1688 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
1689 | int nb_sectors, QEMUIOVector *qiov) | |
1690 | { | |
1691 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
1692 | ||
1693 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov); | |
1694 | } | |
1695 | ||
83f64091 FB |
1696 | /** |
1697 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1698 | */ | |
1699 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1700 | { | |
1701 | BlockDriver *drv = bs->drv; | |
51762288 | 1702 | int ret; |
83f64091 | 1703 | if (!drv) |
19cb3738 | 1704 | return -ENOMEDIUM; |
83f64091 FB |
1705 | if (!drv->bdrv_truncate) |
1706 | return -ENOTSUP; | |
59f2689d NS |
1707 | if (bs->read_only) |
1708 | return -EACCES; | |
8591675f MT |
1709 | if (bdrv_in_use(bs)) |
1710 | return -EBUSY; | |
51762288 SH |
1711 | ret = drv->bdrv_truncate(bs, offset); |
1712 | if (ret == 0) { | |
1713 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 1714 | bdrv_dev_resize_cb(bs); |
51762288 SH |
1715 | } |
1716 | return ret; | |
83f64091 FB |
1717 | } |
1718 | ||
4a1d5e1f FZ |
1719 | /** |
1720 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
1721 | * allocated space. Return < 0 if error or unknown. | |
1722 | */ | |
1723 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
1724 | { | |
1725 | BlockDriver *drv = bs->drv; | |
1726 | if (!drv) { | |
1727 | return -ENOMEDIUM; | |
1728 | } | |
1729 | if (drv->bdrv_get_allocated_file_size) { | |
1730 | return drv->bdrv_get_allocated_file_size(bs); | |
1731 | } | |
1732 | if (bs->file) { | |
1733 | return bdrv_get_allocated_file_size(bs->file); | |
1734 | } | |
1735 | return -ENOTSUP; | |
1736 | } | |
1737 | ||
83f64091 FB |
1738 | /** |
1739 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1740 | */ | |
1741 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1742 | { | |
1743 | BlockDriver *drv = bs->drv; | |
1744 | if (!drv) | |
19cb3738 | 1745 | return -ENOMEDIUM; |
51762288 | 1746 | |
2c6942fa | 1747 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
1748 | if (drv->bdrv_getlength) { |
1749 | return drv->bdrv_getlength(bs); | |
1750 | } | |
83f64091 | 1751 | } |
46a4e4e6 | 1752 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
1753 | } |
1754 | ||
19cb3738 | 1755 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 1756 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 1757 | { |
19cb3738 FB |
1758 | int64_t length; |
1759 | length = bdrv_getlength(bs); | |
1760 | if (length < 0) | |
1761 | length = 0; | |
1762 | else | |
6ea44308 | 1763 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 1764 | *nb_sectors_ptr = length; |
fc01f7e7 | 1765 | } |
cf98951b | 1766 | |
f3d54fc4 AL |
1767 | struct partition { |
1768 | uint8_t boot_ind; /* 0x80 - active */ | |
1769 | uint8_t head; /* starting head */ | |
1770 | uint8_t sector; /* starting sector */ | |
1771 | uint8_t cyl; /* starting cylinder */ | |
1772 | uint8_t sys_ind; /* What partition type */ | |
1773 | uint8_t end_head; /* end head */ | |
1774 | uint8_t end_sector; /* end sector */ | |
1775 | uint8_t end_cyl; /* end cylinder */ | |
1776 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1777 | uint32_t nr_sects; /* nr of sectors in partition */ | |
541dc0d4 | 1778 | } QEMU_PACKED; |
f3d54fc4 AL |
1779 | |
1780 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1781 | static int guess_disk_lchs(BlockDriverState *bs, | |
1782 | int *pcylinders, int *pheads, int *psectors) | |
1783 | { | |
eb5a3165 | 1784 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
1785 | int ret, i, heads, sectors, cylinders; |
1786 | struct partition *p; | |
1787 | uint32_t nr_sects; | |
a38131b6 | 1788 | uint64_t nb_sectors; |
f3d54fc4 AL |
1789 | |
1790 | bdrv_get_geometry(bs, &nb_sectors); | |
1791 | ||
1792 | ret = bdrv_read(bs, 0, buf, 1); | |
1793 | if (ret < 0) | |
1794 | return -1; | |
1795 | /* test msdos magic */ | |
1796 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1797 | return -1; | |
1798 | for(i = 0; i < 4; i++) { | |
1799 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1800 | nr_sects = le32_to_cpu(p->nr_sects); | |
1801 | if (nr_sects && p->end_head) { | |
1802 | /* We make the assumption that the partition terminates on | |
1803 | a cylinder boundary */ | |
1804 | heads = p->end_head + 1; | |
1805 | sectors = p->end_sector & 63; | |
1806 | if (sectors == 0) | |
1807 | continue; | |
1808 | cylinders = nb_sectors / (heads * sectors); | |
1809 | if (cylinders < 1 || cylinders > 16383) | |
1810 | continue; | |
1811 | *pheads = heads; | |
1812 | *psectors = sectors; | |
1813 | *pcylinders = cylinders; | |
1814 | #if 0 | |
1815 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1816 | cylinders, heads, sectors); | |
1817 | #endif | |
1818 | return 0; | |
1819 | } | |
1820 | } | |
1821 | return -1; | |
1822 | } | |
1823 | ||
1824 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1825 | { | |
1826 | int translation, lba_detected = 0; | |
1827 | int cylinders, heads, secs; | |
a38131b6 | 1828 | uint64_t nb_sectors; |
f3d54fc4 AL |
1829 | |
1830 | /* if a geometry hint is available, use it */ | |
1831 | bdrv_get_geometry(bs, &nb_sectors); | |
1832 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1833 | translation = bdrv_get_translation_hint(bs); | |
1834 | if (cylinders != 0) { | |
1835 | *pcyls = cylinders; | |
1836 | *pheads = heads; | |
1837 | *psecs = secs; | |
1838 | } else { | |
1839 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1840 | if (heads > 16) { | |
1841 | /* if heads > 16, it means that a BIOS LBA | |
1842 | translation was active, so the default | |
1843 | hardware geometry is OK */ | |
1844 | lba_detected = 1; | |
1845 | goto default_geometry; | |
1846 | } else { | |
1847 | *pcyls = cylinders; | |
1848 | *pheads = heads; | |
1849 | *psecs = secs; | |
1850 | /* disable any translation to be in sync with | |
1851 | the logical geometry */ | |
1852 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1853 | bdrv_set_translation_hint(bs, | |
1854 | BIOS_ATA_TRANSLATION_NONE); | |
1855 | } | |
1856 | } | |
1857 | } else { | |
1858 | default_geometry: | |
1859 | /* if no geometry, use a standard physical disk geometry */ | |
1860 | cylinders = nb_sectors / (16 * 63); | |
1861 | ||
1862 | if (cylinders > 16383) | |
1863 | cylinders = 16383; | |
1864 | else if (cylinders < 2) | |
1865 | cylinders = 2; | |
1866 | *pcyls = cylinders; | |
1867 | *pheads = 16; | |
1868 | *psecs = 63; | |
1869 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1870 | if ((*pcyls * *pheads) <= 131072) { | |
1871 | bdrv_set_translation_hint(bs, | |
1872 | BIOS_ATA_TRANSLATION_LARGE); | |
1873 | } else { | |
1874 | bdrv_set_translation_hint(bs, | |
1875 | BIOS_ATA_TRANSLATION_LBA); | |
1876 | } | |
1877 | } | |
1878 | } | |
1879 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1880 | } | |
1881 | } | |
1882 | ||
5fafdf24 | 1883 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1884 | int cyls, int heads, int secs) |
1885 | { | |
1886 | bs->cyls = cyls; | |
1887 | bs->heads = heads; | |
1888 | bs->secs = secs; | |
1889 | } | |
1890 | ||
46d4767d FB |
1891 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1892 | { | |
1893 | bs->translation = translation; | |
1894 | } | |
1895 | ||
5fafdf24 | 1896 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1897 | int *pcyls, int *pheads, int *psecs) |
1898 | { | |
1899 | *pcyls = bs->cyls; | |
1900 | *pheads = bs->heads; | |
1901 | *psecs = bs->secs; | |
1902 | } | |
1903 | ||
0563e191 ZYW |
1904 | /* throttling disk io limits */ |
1905 | void bdrv_set_io_limits(BlockDriverState *bs, | |
1906 | BlockIOLimit *io_limits) | |
1907 | { | |
1908 | bs->io_limits = *io_limits; | |
1909 | bs->io_limits_enabled = bdrv_io_limits_enabled(bs); | |
1910 | } | |
1911 | ||
5bbdbb46 BS |
1912 | /* Recognize floppy formats */ |
1913 | typedef struct FDFormat { | |
1914 | FDriveType drive; | |
1915 | uint8_t last_sect; | |
1916 | uint8_t max_track; | |
1917 | uint8_t max_head; | |
1918 | } FDFormat; | |
1919 | ||
1920 | static const FDFormat fd_formats[] = { | |
1921 | /* First entry is default format */ | |
1922 | /* 1.44 MB 3"1/2 floppy disks */ | |
1923 | { FDRIVE_DRV_144, 18, 80, 1, }, | |
1924 | { FDRIVE_DRV_144, 20, 80, 1, }, | |
1925 | { FDRIVE_DRV_144, 21, 80, 1, }, | |
1926 | { FDRIVE_DRV_144, 21, 82, 1, }, | |
1927 | { FDRIVE_DRV_144, 21, 83, 1, }, | |
1928 | { FDRIVE_DRV_144, 22, 80, 1, }, | |
1929 | { FDRIVE_DRV_144, 23, 80, 1, }, | |
1930 | { FDRIVE_DRV_144, 24, 80, 1, }, | |
1931 | /* 2.88 MB 3"1/2 floppy disks */ | |
1932 | { FDRIVE_DRV_288, 36, 80, 1, }, | |
1933 | { FDRIVE_DRV_288, 39, 80, 1, }, | |
1934 | { FDRIVE_DRV_288, 40, 80, 1, }, | |
1935 | { FDRIVE_DRV_288, 44, 80, 1, }, | |
1936 | { FDRIVE_DRV_288, 48, 80, 1, }, | |
1937 | /* 720 kB 3"1/2 floppy disks */ | |
1938 | { FDRIVE_DRV_144, 9, 80, 1, }, | |
1939 | { FDRIVE_DRV_144, 10, 80, 1, }, | |
1940 | { FDRIVE_DRV_144, 10, 82, 1, }, | |
1941 | { FDRIVE_DRV_144, 10, 83, 1, }, | |
1942 | { FDRIVE_DRV_144, 13, 80, 1, }, | |
1943 | { FDRIVE_DRV_144, 14, 80, 1, }, | |
1944 | /* 1.2 MB 5"1/4 floppy disks */ | |
1945 | { FDRIVE_DRV_120, 15, 80, 1, }, | |
1946 | { FDRIVE_DRV_120, 18, 80, 1, }, | |
1947 | { FDRIVE_DRV_120, 18, 82, 1, }, | |
1948 | { FDRIVE_DRV_120, 18, 83, 1, }, | |
1949 | { FDRIVE_DRV_120, 20, 80, 1, }, | |
1950 | /* 720 kB 5"1/4 floppy disks */ | |
1951 | { FDRIVE_DRV_120, 9, 80, 1, }, | |
1952 | { FDRIVE_DRV_120, 11, 80, 1, }, | |
1953 | /* 360 kB 5"1/4 floppy disks */ | |
1954 | { FDRIVE_DRV_120, 9, 40, 1, }, | |
1955 | { FDRIVE_DRV_120, 9, 40, 0, }, | |
1956 | { FDRIVE_DRV_120, 10, 41, 1, }, | |
1957 | { FDRIVE_DRV_120, 10, 42, 1, }, | |
1958 | /* 320 kB 5"1/4 floppy disks */ | |
1959 | { FDRIVE_DRV_120, 8, 40, 1, }, | |
1960 | { FDRIVE_DRV_120, 8, 40, 0, }, | |
1961 | /* 360 kB must match 5"1/4 better than 3"1/2... */ | |
1962 | { FDRIVE_DRV_144, 9, 80, 0, }, | |
1963 | /* end */ | |
1964 | { FDRIVE_DRV_NONE, -1, -1, 0, }, | |
1965 | }; | |
1966 | ||
1967 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
1968 | int *max_track, int *last_sect, | |
1969 | FDriveType drive_in, FDriveType *drive) | |
1970 | { | |
1971 | const FDFormat *parse; | |
1972 | uint64_t nb_sectors, size; | |
1973 | int i, first_match, match; | |
1974 | ||
1975 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
1976 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
1977 | /* User defined disk */ | |
1978 | } else { | |
1979 | bdrv_get_geometry(bs, &nb_sectors); | |
1980 | match = -1; | |
1981 | first_match = -1; | |
1982 | for (i = 0; ; i++) { | |
1983 | parse = &fd_formats[i]; | |
1984 | if (parse->drive == FDRIVE_DRV_NONE) { | |
1985 | break; | |
1986 | } | |
1987 | if (drive_in == parse->drive || | |
1988 | drive_in == FDRIVE_DRV_NONE) { | |
1989 | size = (parse->max_head + 1) * parse->max_track * | |
1990 | parse->last_sect; | |
1991 | if (nb_sectors == size) { | |
1992 | match = i; | |
1993 | break; | |
1994 | } | |
1995 | if (first_match == -1) { | |
1996 | first_match = i; | |
1997 | } | |
1998 | } | |
1999 | } | |
2000 | if (match == -1) { | |
2001 | if (first_match == -1) { | |
2002 | match = 1; | |
2003 | } else { | |
2004 | match = first_match; | |
2005 | } | |
2006 | parse = &fd_formats[match]; | |
2007 | } | |
2008 | *nb_heads = parse->max_head + 1; | |
2009 | *max_track = parse->max_track; | |
2010 | *last_sect = parse->last_sect; | |
2011 | *drive = parse->drive; | |
2012 | } | |
2013 | } | |
2014 | ||
46d4767d FB |
2015 | int bdrv_get_translation_hint(BlockDriverState *bs) |
2016 | { | |
2017 | return bs->translation; | |
2018 | } | |
2019 | ||
abd7f68d MA |
2020 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
2021 | BlockErrorAction on_write_error) | |
2022 | { | |
2023 | bs->on_read_error = on_read_error; | |
2024 | bs->on_write_error = on_write_error; | |
2025 | } | |
2026 | ||
2027 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
2028 | { | |
2029 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2030 | } | |
2031 | ||
b338082b FB |
2032 | int bdrv_is_read_only(BlockDriverState *bs) |
2033 | { | |
2034 | return bs->read_only; | |
2035 | } | |
2036 | ||
985a03b0 TS |
2037 | int bdrv_is_sg(BlockDriverState *bs) |
2038 | { | |
2039 | return bs->sg; | |
2040 | } | |
2041 | ||
e900a7b7 CH |
2042 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2043 | { | |
2044 | return bs->enable_write_cache; | |
2045 | } | |
2046 | ||
ea2384d3 FB |
2047 | int bdrv_is_encrypted(BlockDriverState *bs) |
2048 | { | |
2049 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2050 | return 1; | |
2051 | return bs->encrypted; | |
2052 | } | |
2053 | ||
c0f4ce77 AL |
2054 | int bdrv_key_required(BlockDriverState *bs) |
2055 | { | |
2056 | BlockDriverState *backing_hd = bs->backing_hd; | |
2057 | ||
2058 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2059 | return 1; | |
2060 | return (bs->encrypted && !bs->valid_key); | |
2061 | } | |
2062 | ||
ea2384d3 FB |
2063 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2064 | { | |
2065 | int ret; | |
2066 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2067 | ret = bdrv_set_key(bs->backing_hd, key); | |
2068 | if (ret < 0) | |
2069 | return ret; | |
2070 | if (!bs->encrypted) | |
2071 | return 0; | |
2072 | } | |
fd04a2ae SH |
2073 | if (!bs->encrypted) { |
2074 | return -EINVAL; | |
2075 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2076 | return -ENOMEDIUM; | |
2077 | } | |
c0f4ce77 | 2078 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2079 | if (ret < 0) { |
2080 | bs->valid_key = 0; | |
2081 | } else if (!bs->valid_key) { | |
2082 | bs->valid_key = 1; | |
2083 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2084 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2085 | } |
c0f4ce77 | 2086 | return ret; |
ea2384d3 FB |
2087 | } |
2088 | ||
2089 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
2090 | { | |
19cb3738 | 2091 | if (!bs->drv) { |
ea2384d3 FB |
2092 | buf[0] = '\0'; |
2093 | } else { | |
2094 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
2095 | } | |
2096 | } | |
2097 | ||
5fafdf24 | 2098 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2099 | void *opaque) |
2100 | { | |
2101 | BlockDriver *drv; | |
2102 | ||
8a22f02a | 2103 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2104 | it(opaque, drv->format_name); |
2105 | } | |
2106 | } | |
2107 | ||
b338082b FB |
2108 | BlockDriverState *bdrv_find(const char *name) |
2109 | { | |
2110 | BlockDriverState *bs; | |
2111 | ||
1b7bdbc1 SH |
2112 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2113 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2114 | return bs; |
1b7bdbc1 | 2115 | } |
b338082b FB |
2116 | } |
2117 | return NULL; | |
2118 | } | |
2119 | ||
2f399b0a MA |
2120 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2121 | { | |
2122 | if (!bs) { | |
2123 | return QTAILQ_FIRST(&bdrv_states); | |
2124 | } | |
2125 | return QTAILQ_NEXT(bs, list); | |
2126 | } | |
2127 | ||
51de9760 | 2128 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2129 | { |
2130 | BlockDriverState *bs; | |
2131 | ||
1b7bdbc1 | 2132 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2133 | it(opaque, bs); |
81d0912d FB |
2134 | } |
2135 | } | |
2136 | ||
ea2384d3 FB |
2137 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2138 | { | |
2139 | return bs->device_name; | |
2140 | } | |
2141 | ||
c6ca28d6 AL |
2142 | void bdrv_flush_all(void) |
2143 | { | |
2144 | BlockDriverState *bs; | |
2145 | ||
1b7bdbc1 | 2146 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
c602a489 | 2147 | if (!bdrv_is_read_only(bs) && bdrv_is_inserted(bs)) { |
c6ca28d6 | 2148 | bdrv_flush(bs); |
1b7bdbc1 SH |
2149 | } |
2150 | } | |
c6ca28d6 AL |
2151 | } |
2152 | ||
f2feebbd KW |
2153 | int bdrv_has_zero_init(BlockDriverState *bs) |
2154 | { | |
2155 | assert(bs->drv); | |
2156 | ||
336c1c12 KW |
2157 | if (bs->drv->bdrv_has_zero_init) { |
2158 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
2159 | } |
2160 | ||
2161 | return 1; | |
2162 | } | |
2163 | ||
376ae3f1 SH |
2164 | typedef struct BdrvCoIsAllocatedData { |
2165 | BlockDriverState *bs; | |
2166 | int64_t sector_num; | |
2167 | int nb_sectors; | |
2168 | int *pnum; | |
2169 | int ret; | |
2170 | bool done; | |
2171 | } BdrvCoIsAllocatedData; | |
2172 | ||
f58c7b35 TS |
2173 | /* |
2174 | * Returns true iff the specified sector is present in the disk image. Drivers | |
2175 | * not implementing the functionality are assumed to not support backing files, | |
2176 | * hence all their sectors are reported as allocated. | |
2177 | * | |
bd9533e3 SH |
2178 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
2179 | * and 'pnum' is set to 0. | |
2180 | * | |
f58c7b35 TS |
2181 | * 'pnum' is set to the number of sectors (including and immediately following |
2182 | * the specified sector) that are known to be in the same | |
2183 | * allocated/unallocated state. | |
2184 | * | |
bd9533e3 SH |
2185 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
2186 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 2187 | */ |
060f51c9 SH |
2188 | int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
2189 | int nb_sectors, int *pnum) | |
f58c7b35 | 2190 | { |
bd9533e3 SH |
2191 | int64_t n; |
2192 | ||
2193 | if (sector_num >= bs->total_sectors) { | |
2194 | *pnum = 0; | |
2195 | return 0; | |
2196 | } | |
2197 | ||
2198 | n = bs->total_sectors - sector_num; | |
2199 | if (n < nb_sectors) { | |
2200 | nb_sectors = n; | |
2201 | } | |
2202 | ||
6aebab14 | 2203 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 2204 | *pnum = nb_sectors; |
f58c7b35 TS |
2205 | return 1; |
2206 | } | |
6aebab14 | 2207 | |
060f51c9 SH |
2208 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
2209 | } | |
2210 | ||
2211 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
2212 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
2213 | { | |
2214 | BdrvCoIsAllocatedData *data = opaque; | |
2215 | BlockDriverState *bs = data->bs; | |
2216 | ||
2217 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
2218 | data->pnum); | |
2219 | data->done = true; | |
2220 | } | |
2221 | ||
2222 | /* | |
2223 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
2224 | * | |
2225 | * See bdrv_co_is_allocated() for details. | |
2226 | */ | |
2227 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
2228 | int *pnum) | |
2229 | { | |
6aebab14 SH |
2230 | Coroutine *co; |
2231 | BdrvCoIsAllocatedData data = { | |
2232 | .bs = bs, | |
2233 | .sector_num = sector_num, | |
2234 | .nb_sectors = nb_sectors, | |
2235 | .pnum = pnum, | |
2236 | .done = false, | |
2237 | }; | |
2238 | ||
2239 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
2240 | qemu_coroutine_enter(co, &data); | |
2241 | while (!data.done) { | |
2242 | qemu_aio_wait(); | |
2243 | } | |
2244 | return data.ret; | |
f58c7b35 TS |
2245 | } |
2246 | ||
2582bfed LC |
2247 | void bdrv_mon_event(const BlockDriverState *bdrv, |
2248 | BlockMonEventAction action, int is_read) | |
2249 | { | |
2250 | QObject *data; | |
2251 | const char *action_str; | |
2252 | ||
2253 | switch (action) { | |
2254 | case BDRV_ACTION_REPORT: | |
2255 | action_str = "report"; | |
2256 | break; | |
2257 | case BDRV_ACTION_IGNORE: | |
2258 | action_str = "ignore"; | |
2259 | break; | |
2260 | case BDRV_ACTION_STOP: | |
2261 | action_str = "stop"; | |
2262 | break; | |
2263 | default: | |
2264 | abort(); | |
2265 | } | |
2266 | ||
2267 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
2268 | bdrv->device_name, | |
2269 | action_str, | |
2270 | is_read ? "read" : "write"); | |
2271 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
2272 | ||
2273 | qobject_decref(data); | |
2274 | } | |
2275 | ||
b2023818 | 2276 | BlockInfoList *qmp_query_block(Error **errp) |
b338082b | 2277 | { |
b2023818 | 2278 | BlockInfoList *head = NULL, *cur_item = NULL; |
b338082b FB |
2279 | BlockDriverState *bs; |
2280 | ||
1b7bdbc1 | 2281 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
b2023818 | 2282 | BlockInfoList *info = g_malloc0(sizeof(*info)); |
d15e5465 | 2283 | |
b2023818 LC |
2284 | info->value = g_malloc0(sizeof(*info->value)); |
2285 | info->value->device = g_strdup(bs->device_name); | |
2286 | info->value->type = g_strdup("unknown"); | |
2287 | info->value->locked = bdrv_dev_is_medium_locked(bs); | |
2288 | info->value->removable = bdrv_dev_has_removable_media(bs); | |
d15e5465 | 2289 | |
e4def80b | 2290 | if (bdrv_dev_has_removable_media(bs)) { |
b2023818 LC |
2291 | info->value->has_tray_open = true; |
2292 | info->value->tray_open = bdrv_dev_is_tray_open(bs); | |
e4def80b | 2293 | } |
f04ef601 LC |
2294 | |
2295 | if (bdrv_iostatus_is_enabled(bs)) { | |
b2023818 LC |
2296 | info->value->has_io_status = true; |
2297 | info->value->io_status = bs->iostatus; | |
f04ef601 LC |
2298 | } |
2299 | ||
19cb3738 | 2300 | if (bs->drv) { |
b2023818 LC |
2301 | info->value->has_inserted = true; |
2302 | info->value->inserted = g_malloc0(sizeof(*info->value->inserted)); | |
2303 | info->value->inserted->file = g_strdup(bs->filename); | |
2304 | info->value->inserted->ro = bs->read_only; | |
2305 | info->value->inserted->drv = g_strdup(bs->drv->format_name); | |
2306 | info->value->inserted->encrypted = bs->encrypted; | |
2307 | if (bs->backing_file[0]) { | |
2308 | info->value->inserted->has_backing_file = true; | |
2309 | info->value->inserted->backing_file = g_strdup(bs->backing_file); | |
376253ec | 2310 | } |
727f005e ZYW |
2311 | |
2312 | if (bs->io_limits_enabled) { | |
2313 | info->value->inserted->bps = | |
2314 | bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
2315 | info->value->inserted->bps_rd = | |
2316 | bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; | |
2317 | info->value->inserted->bps_wr = | |
2318 | bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; | |
2319 | info->value->inserted->iops = | |
2320 | bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
2321 | info->value->inserted->iops_rd = | |
2322 | bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; | |
2323 | info->value->inserted->iops_wr = | |
2324 | bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; | |
2325 | } | |
b2023818 | 2326 | } |
d15e5465 | 2327 | |
b2023818 LC |
2328 | /* XXX: waiting for the qapi to support GSList */ |
2329 | if (!cur_item) { | |
2330 | head = cur_item = info; | |
2331 | } else { | |
2332 | cur_item->next = info; | |
2333 | cur_item = info; | |
b338082b | 2334 | } |
b338082b | 2335 | } |
d15e5465 | 2336 | |
b2023818 | 2337 | return head; |
b338082b | 2338 | } |
a36e69dd | 2339 | |
f11f57e4 LC |
2340 | /* Consider exposing this as a full fledged QMP command */ |
2341 | static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) | |
2342 | { | |
2343 | BlockStats *s; | |
2344 | ||
2345 | s = g_malloc0(sizeof(*s)); | |
2346 | ||
2347 | if (bs->device_name[0]) { | |
2348 | s->has_device = true; | |
2349 | s->device = g_strdup(bs->device_name); | |
294cc35f KW |
2350 | } |
2351 | ||
f11f57e4 LC |
2352 | s->stats = g_malloc0(sizeof(*s->stats)); |
2353 | s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; | |
2354 | s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; | |
2355 | s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; | |
2356 | s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; | |
2357 | s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; | |
2358 | s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; | |
2359 | s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; | |
2360 | s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; | |
2361 | s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; | |
2362 | ||
294cc35f | 2363 | if (bs->file) { |
f11f57e4 LC |
2364 | s->has_parent = true; |
2365 | s->parent = qmp_query_blockstat(bs->file, NULL); | |
294cc35f KW |
2366 | } |
2367 | ||
f11f57e4 | 2368 | return s; |
294cc35f KW |
2369 | } |
2370 | ||
f11f57e4 | 2371 | BlockStatsList *qmp_query_blockstats(Error **errp) |
218a536a | 2372 | { |
f11f57e4 | 2373 | BlockStatsList *head = NULL, *cur_item = NULL; |
a36e69dd TS |
2374 | BlockDriverState *bs; |
2375 | ||
1b7bdbc1 | 2376 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f11f57e4 LC |
2377 | BlockStatsList *info = g_malloc0(sizeof(*info)); |
2378 | info->value = qmp_query_blockstat(bs, NULL); | |
2379 | ||
2380 | /* XXX: waiting for the qapi to support GSList */ | |
2381 | if (!cur_item) { | |
2382 | head = cur_item = info; | |
2383 | } else { | |
2384 | cur_item->next = info; | |
2385 | cur_item = info; | |
2386 | } | |
a36e69dd | 2387 | } |
218a536a | 2388 | |
f11f57e4 | 2389 | return head; |
a36e69dd | 2390 | } |
ea2384d3 | 2391 | |
045df330 AL |
2392 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
2393 | { | |
2394 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2395 | return bs->backing_file; | |
2396 | else if (bs->encrypted) | |
2397 | return bs->filename; | |
2398 | else | |
2399 | return NULL; | |
2400 | } | |
2401 | ||
5fafdf24 | 2402 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
2403 | char *filename, int filename_size) |
2404 | { | |
3574c608 | 2405 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
2406 | } |
2407 | ||
5fafdf24 | 2408 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
2409 | const uint8_t *buf, int nb_sectors) |
2410 | { | |
2411 | BlockDriver *drv = bs->drv; | |
2412 | if (!drv) | |
19cb3738 | 2413 | return -ENOMEDIUM; |
faea38e7 FB |
2414 | if (!drv->bdrv_write_compressed) |
2415 | return -ENOTSUP; | |
fbb7b4e0 KW |
2416 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2417 | return -EIO; | |
a55eb92c | 2418 | |
c6d22830 | 2419 | if (bs->dirty_bitmap) { |
7cd1e32a LS |
2420 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
2421 | } | |
a55eb92c | 2422 | |
faea38e7 FB |
2423 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
2424 | } | |
3b46e624 | 2425 | |
faea38e7 FB |
2426 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
2427 | { | |
2428 | BlockDriver *drv = bs->drv; | |
2429 | if (!drv) | |
19cb3738 | 2430 | return -ENOMEDIUM; |
faea38e7 FB |
2431 | if (!drv->bdrv_get_info) |
2432 | return -ENOTSUP; | |
2433 | memset(bdi, 0, sizeof(*bdi)); | |
2434 | return drv->bdrv_get_info(bs, bdi); | |
2435 | } | |
2436 | ||
45566e9c CH |
2437 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
2438 | int64_t pos, int size) | |
178e08a5 AL |
2439 | { |
2440 | BlockDriver *drv = bs->drv; | |
2441 | if (!drv) | |
2442 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2443 | if (drv->bdrv_save_vmstate) |
2444 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
2445 | if (bs->file) | |
2446 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
2447 | return -ENOTSUP; | |
178e08a5 AL |
2448 | } |
2449 | ||
45566e9c CH |
2450 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2451 | int64_t pos, int size) | |
178e08a5 AL |
2452 | { |
2453 | BlockDriver *drv = bs->drv; | |
2454 | if (!drv) | |
2455 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2456 | if (drv->bdrv_load_vmstate) |
2457 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
2458 | if (bs->file) | |
2459 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
2460 | return -ENOTSUP; | |
178e08a5 AL |
2461 | } |
2462 | ||
8b9b0cc2 KW |
2463 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
2464 | { | |
2465 | BlockDriver *drv = bs->drv; | |
2466 | ||
2467 | if (!drv || !drv->bdrv_debug_event) { | |
2468 | return; | |
2469 | } | |
2470 | ||
2471 | return drv->bdrv_debug_event(bs, event); | |
2472 | ||
2473 | } | |
2474 | ||
faea38e7 FB |
2475 | /**************************************************************/ |
2476 | /* handling of snapshots */ | |
2477 | ||
feeee5ac MDCF |
2478 | int bdrv_can_snapshot(BlockDriverState *bs) |
2479 | { | |
2480 | BlockDriver *drv = bs->drv; | |
07b70bfb | 2481 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
feeee5ac MDCF |
2482 | return 0; |
2483 | } | |
2484 | ||
2485 | if (!drv->bdrv_snapshot_create) { | |
2486 | if (bs->file != NULL) { | |
2487 | return bdrv_can_snapshot(bs->file); | |
2488 | } | |
2489 | return 0; | |
2490 | } | |
2491 | ||
2492 | return 1; | |
2493 | } | |
2494 | ||
199630b6 BS |
2495 | int bdrv_is_snapshot(BlockDriverState *bs) |
2496 | { | |
2497 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
2498 | } | |
2499 | ||
f9092b10 MA |
2500 | BlockDriverState *bdrv_snapshots(void) |
2501 | { | |
2502 | BlockDriverState *bs; | |
2503 | ||
3ac906f7 | 2504 | if (bs_snapshots) { |
f9092b10 | 2505 | return bs_snapshots; |
3ac906f7 | 2506 | } |
f9092b10 MA |
2507 | |
2508 | bs = NULL; | |
2509 | while ((bs = bdrv_next(bs))) { | |
2510 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
2511 | bs_snapshots = bs; |
2512 | return bs; | |
f9092b10 MA |
2513 | } |
2514 | } | |
2515 | return NULL; | |
f9092b10 MA |
2516 | } |
2517 | ||
5fafdf24 | 2518 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
2519 | QEMUSnapshotInfo *sn_info) |
2520 | { | |
2521 | BlockDriver *drv = bs->drv; | |
2522 | if (!drv) | |
19cb3738 | 2523 | return -ENOMEDIUM; |
7cdb1f6d MK |
2524 | if (drv->bdrv_snapshot_create) |
2525 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2526 | if (bs->file) | |
2527 | return bdrv_snapshot_create(bs->file, sn_info); | |
2528 | return -ENOTSUP; | |
faea38e7 FB |
2529 | } |
2530 | ||
5fafdf24 | 2531 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
2532 | const char *snapshot_id) |
2533 | { | |
2534 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
2535 | int ret, open_ret; |
2536 | ||
faea38e7 | 2537 | if (!drv) |
19cb3738 | 2538 | return -ENOMEDIUM; |
7cdb1f6d MK |
2539 | if (drv->bdrv_snapshot_goto) |
2540 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2541 | ||
2542 | if (bs->file) { | |
2543 | drv->bdrv_close(bs); | |
2544 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2545 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2546 | if (open_ret < 0) { | |
2547 | bdrv_delete(bs->file); | |
2548 | bs->drv = NULL; | |
2549 | return open_ret; | |
2550 | } | |
2551 | return ret; | |
2552 | } | |
2553 | ||
2554 | return -ENOTSUP; | |
faea38e7 FB |
2555 | } |
2556 | ||
2557 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2558 | { | |
2559 | BlockDriver *drv = bs->drv; | |
2560 | if (!drv) | |
19cb3738 | 2561 | return -ENOMEDIUM; |
7cdb1f6d MK |
2562 | if (drv->bdrv_snapshot_delete) |
2563 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2564 | if (bs->file) | |
2565 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2566 | return -ENOTSUP; | |
faea38e7 FB |
2567 | } |
2568 | ||
5fafdf24 | 2569 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
2570 | QEMUSnapshotInfo **psn_info) |
2571 | { | |
2572 | BlockDriver *drv = bs->drv; | |
2573 | if (!drv) | |
19cb3738 | 2574 | return -ENOMEDIUM; |
7cdb1f6d MK |
2575 | if (drv->bdrv_snapshot_list) |
2576 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2577 | if (bs->file) | |
2578 | return bdrv_snapshot_list(bs->file, psn_info); | |
2579 | return -ENOTSUP; | |
faea38e7 FB |
2580 | } |
2581 | ||
51ef6727 | 2582 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
2583 | const char *snapshot_name) | |
2584 | { | |
2585 | BlockDriver *drv = bs->drv; | |
2586 | if (!drv) { | |
2587 | return -ENOMEDIUM; | |
2588 | } | |
2589 | if (!bs->read_only) { | |
2590 | return -EINVAL; | |
2591 | } | |
2592 | if (drv->bdrv_snapshot_load_tmp) { | |
2593 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2594 | } | |
2595 | return -ENOTSUP; | |
2596 | } | |
2597 | ||
faea38e7 FB |
2598 | #define NB_SUFFIXES 4 |
2599 | ||
2600 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2601 | { | |
2602 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2603 | int64_t base; | |
2604 | int i; | |
2605 | ||
2606 | if (size <= 999) { | |
2607 | snprintf(buf, buf_size, "%" PRId64, size); | |
2608 | } else { | |
2609 | base = 1024; | |
2610 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2611 | if (size < (10 * base)) { | |
5fafdf24 | 2612 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
2613 | (double)size / base, |
2614 | suffixes[i]); | |
2615 | break; | |
2616 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 2617 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
2618 | ((size + (base >> 1)) / base), |
2619 | suffixes[i]); | |
2620 | break; | |
2621 | } | |
2622 | base = base * 1024; | |
2623 | } | |
2624 | } | |
2625 | return buf; | |
2626 | } | |
2627 | ||
2628 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
2629 | { | |
2630 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
2631 | #ifdef _WIN32 |
2632 | struct tm *ptm; | |
2633 | #else | |
faea38e7 | 2634 | struct tm tm; |
3b9f94e1 | 2635 | #endif |
faea38e7 FB |
2636 | time_t ti; |
2637 | int64_t secs; | |
2638 | ||
2639 | if (!sn) { | |
5fafdf24 TS |
2640 | snprintf(buf, buf_size, |
2641 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
2642 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
2643 | } else { | |
2644 | ti = sn->date_sec; | |
3b9f94e1 FB |
2645 | #ifdef _WIN32 |
2646 | ptm = localtime(&ti); | |
2647 | strftime(date_buf, sizeof(date_buf), | |
2648 | "%Y-%m-%d %H:%M:%S", ptm); | |
2649 | #else | |
faea38e7 FB |
2650 | localtime_r(&ti, &tm); |
2651 | strftime(date_buf, sizeof(date_buf), | |
2652 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 2653 | #endif |
faea38e7 FB |
2654 | secs = sn->vm_clock_nsec / 1000000000; |
2655 | snprintf(clock_buf, sizeof(clock_buf), | |
2656 | "%02d:%02d:%02d.%03d", | |
2657 | (int)(secs / 3600), | |
2658 | (int)((secs / 60) % 60), | |
5fafdf24 | 2659 | (int)(secs % 60), |
faea38e7 FB |
2660 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
2661 | snprintf(buf, buf_size, | |
5fafdf24 | 2662 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
2663 | sn->id_str, sn->name, |
2664 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
2665 | date_buf, | |
2666 | clock_buf); | |
2667 | } | |
2668 | return buf; | |
2669 | } | |
2670 | ||
ea2384d3 | 2671 | /**************************************************************/ |
83f64091 | 2672 | /* async I/Os */ |
ea2384d3 | 2673 | |
3b69e4b9 | 2674 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 2675 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 2676 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 2677 | { |
bbf0a440 SH |
2678 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
2679 | ||
b2a61371 | 2680 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 2681 | cb, opaque, false); |
ea2384d3 FB |
2682 | } |
2683 | ||
f141eafe AL |
2684 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
2685 | QEMUIOVector *qiov, int nb_sectors, | |
2686 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 2687 | { |
bbf0a440 SH |
2688 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
2689 | ||
1a6e115b | 2690 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 2691 | cb, opaque, true); |
83f64091 FB |
2692 | } |
2693 | ||
40b4f539 KW |
2694 | |
2695 | typedef struct MultiwriteCB { | |
2696 | int error; | |
2697 | int num_requests; | |
2698 | int num_callbacks; | |
2699 | struct { | |
2700 | BlockDriverCompletionFunc *cb; | |
2701 | void *opaque; | |
2702 | QEMUIOVector *free_qiov; | |
2703 | void *free_buf; | |
2704 | } callbacks[]; | |
2705 | } MultiwriteCB; | |
2706 | ||
2707 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
2708 | { | |
2709 | int i; | |
2710 | ||
2711 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2712 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
2713 | if (mcb->callbacks[i].free_qiov) { |
2714 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2715 | } | |
7267c094 | 2716 | g_free(mcb->callbacks[i].free_qiov); |
f8a83245 | 2717 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
2718 | } |
2719 | } | |
2720 | ||
2721 | static void multiwrite_cb(void *opaque, int ret) | |
2722 | { | |
2723 | MultiwriteCB *mcb = opaque; | |
2724 | ||
6d519a5f SH |
2725 | trace_multiwrite_cb(mcb, ret); |
2726 | ||
cb6d3ca0 | 2727 | if (ret < 0 && !mcb->error) { |
40b4f539 | 2728 | mcb->error = ret; |
40b4f539 KW |
2729 | } |
2730 | ||
2731 | mcb->num_requests--; | |
2732 | if (mcb->num_requests == 0) { | |
de189a1b | 2733 | multiwrite_user_cb(mcb); |
7267c094 | 2734 | g_free(mcb); |
40b4f539 KW |
2735 | } |
2736 | } | |
2737 | ||
2738 | static int multiwrite_req_compare(const void *a, const void *b) | |
2739 | { | |
77be4366 CH |
2740 | const BlockRequest *req1 = a, *req2 = b; |
2741 | ||
2742 | /* | |
2743 | * Note that we can't simply subtract req2->sector from req1->sector | |
2744 | * here as that could overflow the return value. | |
2745 | */ | |
2746 | if (req1->sector > req2->sector) { | |
2747 | return 1; | |
2748 | } else if (req1->sector < req2->sector) { | |
2749 | return -1; | |
2750 | } else { | |
2751 | return 0; | |
2752 | } | |
40b4f539 KW |
2753 | } |
2754 | ||
2755 | /* | |
2756 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2757 | * requests that remain after merging. | |
2758 | */ | |
2759 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2760 | int num_reqs, MultiwriteCB *mcb) | |
2761 | { | |
2762 | int i, outidx; | |
2763 | ||
2764 | // Sort requests by start sector | |
2765 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2766 | ||
2767 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2768 | // filling up gaps with zero sectors. | |
2769 | outidx = 0; | |
2770 | for (i = 1; i < num_reqs; i++) { | |
2771 | int merge = 0; | |
2772 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2773 | ||
2774 | // This handles the cases that are valid for all block drivers, namely | |
2775 | // exactly sequential writes and overlapping writes. | |
2776 | if (reqs[i].sector <= oldreq_last) { | |
2777 | merge = 1; | |
2778 | } | |
2779 | ||
2780 | // The block driver may decide that it makes sense to combine requests | |
2781 | // even if there is a gap of some sectors between them. In this case, | |
2782 | // the gap is filled with zeros (therefore only applicable for yet | |
2783 | // unused space in format like qcow2). | |
2784 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2785 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2786 | } | |
2787 | ||
e2a305fb CH |
2788 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
2789 | merge = 0; | |
2790 | } | |
2791 | ||
40b4f539 KW |
2792 | if (merge) { |
2793 | size_t size; | |
7267c094 | 2794 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
2795 | qemu_iovec_init(qiov, |
2796 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2797 | ||
2798 | // Add the first request to the merged one. If the requests are | |
2799 | // overlapping, drop the last sectors of the first request. | |
2800 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2801 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2802 | ||
2803 | // We might need to add some zeros between the two requests | |
2804 | if (reqs[i].sector > oldreq_last) { | |
2805 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2806 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2807 | memset(buf, 0, zero_bytes); | |
2808 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2809 | mcb->callbacks[i].free_buf = buf; | |
2810 | } | |
2811 | ||
2812 | // Add the second request | |
2813 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2814 | ||
cbf1dff2 | 2815 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
2816 | reqs[outidx].qiov = qiov; |
2817 | ||
2818 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2819 | } else { | |
2820 | outidx++; | |
2821 | reqs[outidx].sector = reqs[i].sector; | |
2822 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2823 | reqs[outidx].qiov = reqs[i].qiov; | |
2824 | } | |
2825 | } | |
2826 | ||
2827 | return outidx + 1; | |
2828 | } | |
2829 | ||
2830 | /* | |
2831 | * Submit multiple AIO write requests at once. | |
2832 | * | |
2833 | * On success, the function returns 0 and all requests in the reqs array have | |
2834 | * been submitted. In error case this function returns -1, and any of the | |
2835 | * requests may or may not be submitted yet. In particular, this means that the | |
2836 | * callback will be called for some of the requests, for others it won't. The | |
2837 | * caller must check the error field of the BlockRequest to wait for the right | |
2838 | * callbacks (if error != 0, no callback will be called). | |
2839 | * | |
2840 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2841 | * requests. However, the fields opaque and error are left unmodified as they | |
2842 | * are used to signal failure for a single request to the caller. | |
2843 | */ | |
2844 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2845 | { | |
40b4f539 KW |
2846 | MultiwriteCB *mcb; |
2847 | int i; | |
2848 | ||
301db7c2 RH |
2849 | /* don't submit writes if we don't have a medium */ |
2850 | if (bs->drv == NULL) { | |
2851 | for (i = 0; i < num_reqs; i++) { | |
2852 | reqs[i].error = -ENOMEDIUM; | |
2853 | } | |
2854 | return -1; | |
2855 | } | |
2856 | ||
40b4f539 KW |
2857 | if (num_reqs == 0) { |
2858 | return 0; | |
2859 | } | |
2860 | ||
2861 | // Create MultiwriteCB structure | |
7267c094 | 2862 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
2863 | mcb->num_requests = 0; |
2864 | mcb->num_callbacks = num_reqs; | |
2865 | ||
2866 | for (i = 0; i < num_reqs; i++) { | |
2867 | mcb->callbacks[i].cb = reqs[i].cb; | |
2868 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2869 | } | |
2870 | ||
2871 | // Check for mergable requests | |
2872 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2873 | ||
6d519a5f SH |
2874 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
2875 | ||
df9309fb PB |
2876 | /* Run the aio requests. */ |
2877 | mcb->num_requests = num_reqs; | |
40b4f539 | 2878 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 2879 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 2880 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
2881 | } |
2882 | ||
2883 | return 0; | |
40b4f539 KW |
2884 | } |
2885 | ||
83f64091 | 2886 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 2887 | { |
6bbff9a0 | 2888 | acb->pool->cancel(acb); |
83f64091 FB |
2889 | } |
2890 | ||
98f90dba ZYW |
2891 | /* block I/O throttling */ |
2892 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, | |
2893 | bool is_write, double elapsed_time, uint64_t *wait) | |
2894 | { | |
2895 | uint64_t bps_limit = 0; | |
2896 | double bytes_limit, bytes_base, bytes_res; | |
2897 | double slice_time, wait_time; | |
2898 | ||
2899 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
2900 | bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
2901 | } else if (bs->io_limits.bps[is_write]) { | |
2902 | bps_limit = bs->io_limits.bps[is_write]; | |
2903 | } else { | |
2904 | if (wait) { | |
2905 | *wait = 0; | |
2906 | } | |
2907 | ||
2908 | return false; | |
2909 | } | |
2910 | ||
2911 | slice_time = bs->slice_end - bs->slice_start; | |
2912 | slice_time /= (NANOSECONDS_PER_SECOND); | |
2913 | bytes_limit = bps_limit * slice_time; | |
2914 | bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; | |
2915 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
2916 | bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; | |
2917 | } | |
2918 | ||
2919 | /* bytes_base: the bytes of data which have been read/written; and | |
2920 | * it is obtained from the history statistic info. | |
2921 | * bytes_res: the remaining bytes of data which need to be read/written. | |
2922 | * (bytes_base + bytes_res) / bps_limit: used to calcuate | |
2923 | * the total time for completing reading/writting all data. | |
2924 | */ | |
2925 | bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
2926 | ||
2927 | if (bytes_base + bytes_res <= bytes_limit) { | |
2928 | if (wait) { | |
2929 | *wait = 0; | |
2930 | } | |
2931 | ||
2932 | return false; | |
2933 | } | |
2934 | ||
2935 | /* Calc approx time to dispatch */ | |
2936 | wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; | |
2937 | ||
2938 | /* When the I/O rate at runtime exceeds the limits, | |
2939 | * bs->slice_end need to be extended in order that the current statistic | |
2940 | * info can be kept until the timer fire, so it is increased and tuned | |
2941 | * based on the result of experiment. | |
2942 | */ | |
2943 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
2944 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
2945 | if (wait) { | |
2946 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
2947 | } | |
2948 | ||
2949 | return true; | |
2950 | } | |
2951 | ||
2952 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
2953 | double elapsed_time, uint64_t *wait) | |
2954 | { | |
2955 | uint64_t iops_limit = 0; | |
2956 | double ios_limit, ios_base; | |
2957 | double slice_time, wait_time; | |
2958 | ||
2959 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
2960 | iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
2961 | } else if (bs->io_limits.iops[is_write]) { | |
2962 | iops_limit = bs->io_limits.iops[is_write]; | |
2963 | } else { | |
2964 | if (wait) { | |
2965 | *wait = 0; | |
2966 | } | |
2967 | ||
2968 | return false; | |
2969 | } | |
2970 | ||
2971 | slice_time = bs->slice_end - bs->slice_start; | |
2972 | slice_time /= (NANOSECONDS_PER_SECOND); | |
2973 | ios_limit = iops_limit * slice_time; | |
2974 | ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; | |
2975 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
2976 | ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; | |
2977 | } | |
2978 | ||
2979 | if (ios_base + 1 <= ios_limit) { | |
2980 | if (wait) { | |
2981 | *wait = 0; | |
2982 | } | |
2983 | ||
2984 | return false; | |
2985 | } | |
2986 | ||
2987 | /* Calc approx time to dispatch */ | |
2988 | wait_time = (ios_base + 1) / iops_limit; | |
2989 | if (wait_time > elapsed_time) { | |
2990 | wait_time = wait_time - elapsed_time; | |
2991 | } else { | |
2992 | wait_time = 0; | |
2993 | } | |
2994 | ||
2995 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
2996 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
2997 | if (wait) { | |
2998 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
2999 | } | |
3000 | ||
3001 | return true; | |
3002 | } | |
3003 | ||
3004 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
3005 | bool is_write, int64_t *wait) | |
3006 | { | |
3007 | int64_t now, max_wait; | |
3008 | uint64_t bps_wait = 0, iops_wait = 0; | |
3009 | double elapsed_time; | |
3010 | int bps_ret, iops_ret; | |
3011 | ||
3012 | now = qemu_get_clock_ns(vm_clock); | |
3013 | if ((bs->slice_start < now) | |
3014 | && (bs->slice_end > now)) { | |
3015 | bs->slice_end = now + bs->slice_time; | |
3016 | } else { | |
3017 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
3018 | bs->slice_start = now; | |
3019 | bs->slice_end = now + bs->slice_time; | |
3020 | ||
3021 | bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; | |
3022 | bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; | |
3023 | ||
3024 | bs->io_base.ios[is_write] = bs->nr_ops[is_write]; | |
3025 | bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; | |
3026 | } | |
3027 | ||
3028 | elapsed_time = now - bs->slice_start; | |
3029 | elapsed_time /= (NANOSECONDS_PER_SECOND); | |
3030 | ||
3031 | bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, | |
3032 | is_write, elapsed_time, &bps_wait); | |
3033 | iops_ret = bdrv_exceed_iops_limits(bs, is_write, | |
3034 | elapsed_time, &iops_wait); | |
3035 | if (bps_ret || iops_ret) { | |
3036 | max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; | |
3037 | if (wait) { | |
3038 | *wait = max_wait; | |
3039 | } | |
3040 | ||
3041 | now = qemu_get_clock_ns(vm_clock); | |
3042 | if (bs->slice_end < now + max_wait) { | |
3043 | bs->slice_end = now + max_wait; | |
3044 | } | |
3045 | ||
3046 | return true; | |
3047 | } | |
3048 | ||
3049 | if (wait) { | |
3050 | *wait = 0; | |
3051 | } | |
3052 | ||
3053 | return false; | |
3054 | } | |
ce1a14dc | 3055 | |
83f64091 FB |
3056 | /**************************************************************/ |
3057 | /* async block device emulation */ | |
3058 | ||
c16b5a2c CH |
3059 | typedef struct BlockDriverAIOCBSync { |
3060 | BlockDriverAIOCB common; | |
3061 | QEMUBH *bh; | |
3062 | int ret; | |
3063 | /* vector translation state */ | |
3064 | QEMUIOVector *qiov; | |
3065 | uint8_t *bounce; | |
3066 | int is_write; | |
3067 | } BlockDriverAIOCBSync; | |
3068 | ||
3069 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3070 | { | |
b666d239 KW |
3071 | BlockDriverAIOCBSync *acb = |
3072 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3073 | qemu_bh_delete(acb->bh); |
36afc451 | 3074 | acb->bh = NULL; |
c16b5a2c CH |
3075 | qemu_aio_release(acb); |
3076 | } | |
3077 | ||
3078 | static AIOPool bdrv_em_aio_pool = { | |
3079 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
3080 | .cancel = bdrv_aio_cancel_em, | |
3081 | }; | |
3082 | ||
ce1a14dc | 3083 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3084 | { |
ce1a14dc | 3085 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3086 | |
f141eafe AL |
3087 | if (!acb->is_write) |
3088 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 3089 | qemu_vfree(acb->bounce); |
ce1a14dc | 3090 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3091 | qemu_bh_delete(acb->bh); |
36afc451 | 3092 | acb->bh = NULL; |
ce1a14dc | 3093 | qemu_aio_release(acb); |
83f64091 | 3094 | } |
beac80cd | 3095 | |
f141eafe AL |
3096 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3097 | int64_t sector_num, | |
3098 | QEMUIOVector *qiov, | |
3099 | int nb_sectors, | |
3100 | BlockDriverCompletionFunc *cb, | |
3101 | void *opaque, | |
3102 | int is_write) | |
3103 | ||
83f64091 | 3104 | { |
ce1a14dc | 3105 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3106 | |
c16b5a2c | 3107 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
3108 | acb->is_write = is_write; |
3109 | acb->qiov = qiov; | |
e268ca52 | 3110 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3111 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3112 | |
3113 | if (is_write) { | |
3114 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1ed20acf | 3115 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3116 | } else { |
1ed20acf | 3117 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3118 | } |
3119 | ||
ce1a14dc | 3120 | qemu_bh_schedule(acb->bh); |
f141eafe | 3121 | |
ce1a14dc | 3122 | return &acb->common; |
beac80cd FB |
3123 | } |
3124 | ||
f141eafe AL |
3125 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3126 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3127 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3128 | { |
f141eafe AL |
3129 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3130 | } | |
83f64091 | 3131 | |
f141eafe AL |
3132 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3133 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3134 | BlockDriverCompletionFunc *cb, void *opaque) | |
3135 | { | |
3136 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3137 | } |
beac80cd | 3138 | |
68485420 KW |
3139 | |
3140 | typedef struct BlockDriverAIOCBCoroutine { | |
3141 | BlockDriverAIOCB common; | |
3142 | BlockRequest req; | |
3143 | bool is_write; | |
3144 | QEMUBH* bh; | |
3145 | } BlockDriverAIOCBCoroutine; | |
3146 | ||
3147 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3148 | { | |
3149 | qemu_aio_flush(); | |
3150 | } | |
3151 | ||
3152 | static AIOPool bdrv_em_co_aio_pool = { | |
3153 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), | |
3154 | .cancel = bdrv_aio_co_cancel_em, | |
3155 | }; | |
3156 | ||
35246a68 | 3157 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3158 | { |
3159 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3160 | ||
3161 | acb->common.cb(acb->common.opaque, acb->req.error); | |
3162 | qemu_bh_delete(acb->bh); | |
3163 | qemu_aio_release(acb); | |
3164 | } | |
3165 | ||
b2a61371 SH |
3166 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3167 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3168 | { | |
3169 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3170 | BlockDriverState *bs = acb->common.bs; | |
3171 | ||
3172 | if (!acb->is_write) { | |
3173 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3174 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3175 | } else { |
3176 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
3177 | acb->req.nb_sectors, acb->req.qiov); | |
3178 | } | |
3179 | ||
35246a68 | 3180 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3181 | qemu_bh_schedule(acb->bh); |
3182 | } | |
3183 | ||
68485420 KW |
3184 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3185 | int64_t sector_num, | |
3186 | QEMUIOVector *qiov, | |
3187 | int nb_sectors, | |
3188 | BlockDriverCompletionFunc *cb, | |
3189 | void *opaque, | |
8c5873d6 | 3190 | bool is_write) |
68485420 KW |
3191 | { |
3192 | Coroutine *co; | |
3193 | BlockDriverAIOCBCoroutine *acb; | |
3194 | ||
3195 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3196 | acb->req.sector = sector_num; | |
3197 | acb->req.nb_sectors = nb_sectors; | |
3198 | acb->req.qiov = qiov; | |
3199 | acb->is_write = is_write; | |
3200 | ||
8c5873d6 | 3201 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3202 | qemu_coroutine_enter(co, acb); |
3203 | ||
3204 | return &acb->common; | |
3205 | } | |
3206 | ||
07f07615 | 3207 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3208 | { |
07f07615 PB |
3209 | BlockDriverAIOCBCoroutine *acb = opaque; |
3210 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3211 | |
07f07615 PB |
3212 | acb->req.error = bdrv_co_flush(bs); |
3213 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3214 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3215 | } |
3216 | ||
07f07615 | 3217 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3218 | BlockDriverCompletionFunc *cb, void *opaque) |
3219 | { | |
07f07615 | 3220 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3221 | |
07f07615 PB |
3222 | Coroutine *co; |
3223 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3224 | |
07f07615 PB |
3225 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
3226 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); | |
3227 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3228 | |
016f5cf6 AG |
3229 | return &acb->common; |
3230 | } | |
3231 | ||
4265d620 PB |
3232 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3233 | { | |
3234 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3235 | BlockDriverState *bs = acb->common.bs; | |
3236 | ||
3237 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3238 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3239 | qemu_bh_schedule(acb->bh); | |
3240 | } | |
3241 | ||
3242 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3243 | int64_t sector_num, int nb_sectors, | |
3244 | BlockDriverCompletionFunc *cb, void *opaque) | |
3245 | { | |
3246 | Coroutine *co; | |
3247 | BlockDriverAIOCBCoroutine *acb; | |
3248 | ||
3249 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3250 | ||
3251 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3252 | acb->req.sector = sector_num; | |
3253 | acb->req.nb_sectors = nb_sectors; | |
3254 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
3255 | qemu_coroutine_enter(co, acb); | |
3256 | ||
3257 | return &acb->common; | |
3258 | } | |
3259 | ||
ea2384d3 FB |
3260 | void bdrv_init(void) |
3261 | { | |
5efa9d5a | 3262 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3263 | } |
ce1a14dc | 3264 | |
eb852011 MA |
3265 | void bdrv_init_with_whitelist(void) |
3266 | { | |
3267 | use_bdrv_whitelist = 1; | |
3268 | bdrv_init(); | |
3269 | } | |
3270 | ||
c16b5a2c CH |
3271 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
3272 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 3273 | { |
ce1a14dc PB |
3274 | BlockDriverAIOCB *acb; |
3275 | ||
6bbff9a0 AL |
3276 | if (pool->free_aiocb) { |
3277 | acb = pool->free_aiocb; | |
3278 | pool->free_aiocb = acb->next; | |
ce1a14dc | 3279 | } else { |
7267c094 | 3280 | acb = g_malloc0(pool->aiocb_size); |
6bbff9a0 | 3281 | acb->pool = pool; |
ce1a14dc PB |
3282 | } |
3283 | acb->bs = bs; | |
3284 | acb->cb = cb; | |
3285 | acb->opaque = opaque; | |
3286 | return acb; | |
3287 | } | |
3288 | ||
3289 | void qemu_aio_release(void *p) | |
3290 | { | |
6bbff9a0 AL |
3291 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
3292 | AIOPool *pool = acb->pool; | |
3293 | acb->next = pool->free_aiocb; | |
3294 | pool->free_aiocb = acb; | |
ce1a14dc | 3295 | } |
19cb3738 | 3296 | |
f9f05dc5 KW |
3297 | /**************************************************************/ |
3298 | /* Coroutine block device emulation */ | |
3299 | ||
3300 | typedef struct CoroutineIOCompletion { | |
3301 | Coroutine *coroutine; | |
3302 | int ret; | |
3303 | } CoroutineIOCompletion; | |
3304 | ||
3305 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3306 | { | |
3307 | CoroutineIOCompletion *co = opaque; | |
3308 | ||
3309 | co->ret = ret; | |
3310 | qemu_coroutine_enter(co->coroutine, NULL); | |
3311 | } | |
3312 | ||
3313 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3314 | int nb_sectors, QEMUIOVector *iov, | |
3315 | bool is_write) | |
3316 | { | |
3317 | CoroutineIOCompletion co = { | |
3318 | .coroutine = qemu_coroutine_self(), | |
3319 | }; | |
3320 | BlockDriverAIOCB *acb; | |
3321 | ||
3322 | if (is_write) { | |
a652d160 SH |
3323 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3324 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3325 | } else { |
a652d160 SH |
3326 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3327 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3328 | } |
3329 | ||
59370aaa | 3330 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3331 | if (!acb) { |
3332 | return -EIO; | |
3333 | } | |
3334 | qemu_coroutine_yield(); | |
3335 | ||
3336 | return co.ret; | |
3337 | } | |
3338 | ||
3339 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
3340 | int64_t sector_num, int nb_sectors, | |
3341 | QEMUIOVector *iov) | |
3342 | { | |
3343 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
3344 | } | |
3345 | ||
3346 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
3347 | int64_t sector_num, int nb_sectors, | |
3348 | QEMUIOVector *iov) | |
3349 | { | |
3350 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
3351 | } | |
3352 | ||
07f07615 | 3353 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 3354 | { |
07f07615 PB |
3355 | RwCo *rwco = opaque; |
3356 | ||
3357 | rwco->ret = bdrv_co_flush(rwco->bs); | |
3358 | } | |
3359 | ||
3360 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
3361 | { | |
eb489bb1 KW |
3362 | int ret; |
3363 | ||
ca716364 | 3364 | if (!bs->drv) { |
07f07615 | 3365 | return 0; |
eb489bb1 KW |
3366 | } |
3367 | ||
ca716364 | 3368 | /* Write back cached data to the OS even with cache=unsafe */ |
eb489bb1 KW |
3369 | if (bs->drv->bdrv_co_flush_to_os) { |
3370 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
3371 | if (ret < 0) { | |
3372 | return ret; | |
3373 | } | |
3374 | } | |
3375 | ||
ca716364 KW |
3376 | /* But don't actually force it to the disk with cache=unsafe */ |
3377 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
3378 | return 0; | |
3379 | } | |
3380 | ||
eb489bb1 | 3381 | if (bs->drv->bdrv_co_flush_to_disk) { |
c68b89ac | 3382 | return bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
3383 | } else if (bs->drv->bdrv_aio_flush) { |
3384 | BlockDriverAIOCB *acb; | |
3385 | CoroutineIOCompletion co = { | |
3386 | .coroutine = qemu_coroutine_self(), | |
3387 | }; | |
3388 | ||
3389 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
3390 | if (acb == NULL) { | |
3391 | return -EIO; | |
3392 | } else { | |
3393 | qemu_coroutine_yield(); | |
3394 | return co.ret; | |
3395 | } | |
07f07615 PB |
3396 | } else { |
3397 | /* | |
3398 | * Some block drivers always operate in either writethrough or unsafe | |
3399 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
3400 | * know how the server works (because the behaviour is hardcoded or | |
3401 | * depends on server-side configuration), so we can't ensure that | |
3402 | * everything is safe on disk. Returning an error doesn't work because | |
3403 | * that would break guests even if the server operates in writethrough | |
3404 | * mode. | |
3405 | * | |
3406 | * Let's hope the user knows what he's doing. | |
3407 | */ | |
3408 | return 0; | |
3409 | } | |
3410 | } | |
3411 | ||
0f15423c AL |
3412 | void bdrv_invalidate_cache(BlockDriverState *bs) |
3413 | { | |
3414 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
3415 | bs->drv->bdrv_invalidate_cache(bs); | |
3416 | } | |
3417 | } | |
3418 | ||
3419 | void bdrv_invalidate_cache_all(void) | |
3420 | { | |
3421 | BlockDriverState *bs; | |
3422 | ||
3423 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
3424 | bdrv_invalidate_cache(bs); | |
3425 | } | |
3426 | } | |
3427 | ||
07f07615 PB |
3428 | int bdrv_flush(BlockDriverState *bs) |
3429 | { | |
3430 | Coroutine *co; | |
3431 | RwCo rwco = { | |
3432 | .bs = bs, | |
3433 | .ret = NOT_DONE, | |
e7a8a783 | 3434 | }; |
e7a8a783 | 3435 | |
07f07615 PB |
3436 | if (qemu_in_coroutine()) { |
3437 | /* Fast-path if already in coroutine context */ | |
3438 | bdrv_flush_co_entry(&rwco); | |
3439 | } else { | |
3440 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
3441 | qemu_coroutine_enter(co, &rwco); | |
3442 | while (rwco.ret == NOT_DONE) { | |
3443 | qemu_aio_wait(); | |
3444 | } | |
e7a8a783 | 3445 | } |
07f07615 PB |
3446 | |
3447 | return rwco.ret; | |
e7a8a783 KW |
3448 | } |
3449 | ||
4265d620 PB |
3450 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
3451 | { | |
3452 | RwCo *rwco = opaque; | |
3453 | ||
3454 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
3455 | } | |
3456 | ||
3457 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
3458 | int nb_sectors) | |
3459 | { | |
3460 | if (!bs->drv) { | |
3461 | return -ENOMEDIUM; | |
3462 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
3463 | return -EIO; | |
3464 | } else if (bs->read_only) { | |
3465 | return -EROFS; | |
3466 | } else if (bs->drv->bdrv_co_discard) { | |
3467 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); | |
3468 | } else if (bs->drv->bdrv_aio_discard) { | |
3469 | BlockDriverAIOCB *acb; | |
3470 | CoroutineIOCompletion co = { | |
3471 | .coroutine = qemu_coroutine_self(), | |
3472 | }; | |
3473 | ||
3474 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
3475 | bdrv_co_io_em_complete, &co); | |
3476 | if (acb == NULL) { | |
3477 | return -EIO; | |
3478 | } else { | |
3479 | qemu_coroutine_yield(); | |
3480 | return co.ret; | |
3481 | } | |
4265d620 PB |
3482 | } else { |
3483 | return 0; | |
3484 | } | |
3485 | } | |
3486 | ||
3487 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
3488 | { | |
3489 | Coroutine *co; | |
3490 | RwCo rwco = { | |
3491 | .bs = bs, | |
3492 | .sector_num = sector_num, | |
3493 | .nb_sectors = nb_sectors, | |
3494 | .ret = NOT_DONE, | |
3495 | }; | |
3496 | ||
3497 | if (qemu_in_coroutine()) { | |
3498 | /* Fast-path if already in coroutine context */ | |
3499 | bdrv_discard_co_entry(&rwco); | |
3500 | } else { | |
3501 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
3502 | qemu_coroutine_enter(co, &rwco); | |
3503 | while (rwco.ret == NOT_DONE) { | |
3504 | qemu_aio_wait(); | |
3505 | } | |
3506 | } | |
3507 | ||
3508 | return rwco.ret; | |
3509 | } | |
3510 | ||
19cb3738 FB |
3511 | /**************************************************************/ |
3512 | /* removable device support */ | |
3513 | ||
3514 | /** | |
3515 | * Return TRUE if the media is present | |
3516 | */ | |
3517 | int bdrv_is_inserted(BlockDriverState *bs) | |
3518 | { | |
3519 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 3520 | |
19cb3738 FB |
3521 | if (!drv) |
3522 | return 0; | |
3523 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
3524 | return 1; |
3525 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
3526 | } |
3527 | ||
3528 | /** | |
8e49ca46 MA |
3529 | * Return whether the media changed since the last call to this |
3530 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
3531 | */ |
3532 | int bdrv_media_changed(BlockDriverState *bs) | |
3533 | { | |
3534 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3535 | |
8e49ca46 MA |
3536 | if (drv && drv->bdrv_media_changed) { |
3537 | return drv->bdrv_media_changed(bs); | |
3538 | } | |
3539 | return -ENOTSUP; | |
19cb3738 FB |
3540 | } |
3541 | ||
3542 | /** | |
3543 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
3544 | */ | |
fdec4404 | 3545 | void bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
3546 | { |
3547 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3548 | |
822e1cd1 MA |
3549 | if (drv && drv->bdrv_eject) { |
3550 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 FB |
3551 | } |
3552 | } | |
3553 | ||
19cb3738 FB |
3554 | /** |
3555 | * Lock or unlock the media (if it is locked, the user won't be able | |
3556 | * to eject it manually). | |
3557 | */ | |
025e849a | 3558 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
3559 | { |
3560 | BlockDriver *drv = bs->drv; | |
3561 | ||
025e849a | 3562 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 3563 | |
025e849a MA |
3564 | if (drv && drv->bdrv_lock_medium) { |
3565 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
3566 | } |
3567 | } | |
985a03b0 TS |
3568 | |
3569 | /* needed for generic scsi interface */ | |
3570 | ||
3571 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
3572 | { | |
3573 | BlockDriver *drv = bs->drv; | |
3574 | ||
3575 | if (drv && drv->bdrv_ioctl) | |
3576 | return drv->bdrv_ioctl(bs, req, buf); | |
3577 | return -ENOTSUP; | |
3578 | } | |
7d780669 | 3579 | |
221f715d AL |
3580 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
3581 | unsigned long int req, void *buf, | |
3582 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 3583 | { |
221f715d | 3584 | BlockDriver *drv = bs->drv; |
7d780669 | 3585 | |
221f715d AL |
3586 | if (drv && drv->bdrv_aio_ioctl) |
3587 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
3588 | return NULL; | |
7d780669 | 3589 | } |
e268ca52 | 3590 | |
7b6f9300 MA |
3591 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
3592 | { | |
3593 | bs->buffer_alignment = align; | |
3594 | } | |
7cd1e32a | 3595 | |
e268ca52 AL |
3596 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
3597 | { | |
3598 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
3599 | } | |
7cd1e32a LS |
3600 | |
3601 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
3602 | { | |
3603 | int64_t bitmap_size; | |
a55eb92c | 3604 | |
aaa0eb75 | 3605 | bs->dirty_count = 0; |
a55eb92c | 3606 | if (enable) { |
c6d22830 JK |
3607 | if (!bs->dirty_bitmap) { |
3608 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
3609 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
3610 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 3611 | |
7267c094 | 3612 | bs->dirty_bitmap = g_malloc0(bitmap_size); |
a55eb92c | 3613 | } |
7cd1e32a | 3614 | } else { |
c6d22830 | 3615 | if (bs->dirty_bitmap) { |
7267c094 | 3616 | g_free(bs->dirty_bitmap); |
c6d22830 | 3617 | bs->dirty_bitmap = NULL; |
a55eb92c | 3618 | } |
7cd1e32a LS |
3619 | } |
3620 | } | |
3621 | ||
3622 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
3623 | { | |
6ea44308 | 3624 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 3625 | |
c6d22830 JK |
3626 | if (bs->dirty_bitmap && |
3627 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
6d59fec1 MT |
3628 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
3629 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
7cd1e32a LS |
3630 | } else { |
3631 | return 0; | |
3632 | } | |
3633 | } | |
3634 | ||
a55eb92c JK |
3635 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
3636 | int nr_sectors) | |
7cd1e32a LS |
3637 | { |
3638 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
3639 | } | |
aaa0eb75 LS |
3640 | |
3641 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
3642 | { | |
3643 | return bs->dirty_count; | |
3644 | } | |
f88e1a42 | 3645 | |
db593f25 MT |
3646 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
3647 | { | |
3648 | assert(bs->in_use != in_use); | |
3649 | bs->in_use = in_use; | |
3650 | } | |
3651 | ||
3652 | int bdrv_in_use(BlockDriverState *bs) | |
3653 | { | |
3654 | return bs->in_use; | |
3655 | } | |
3656 | ||
28a7282a LC |
3657 | void bdrv_iostatus_enable(BlockDriverState *bs) |
3658 | { | |
d6bf279e | 3659 | bs->iostatus_enabled = true; |
58e21ef5 | 3660 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
3661 | } |
3662 | ||
3663 | /* The I/O status is only enabled if the drive explicitly | |
3664 | * enables it _and_ the VM is configured to stop on errors */ | |
3665 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
3666 | { | |
d6bf279e | 3667 | return (bs->iostatus_enabled && |
28a7282a LC |
3668 | (bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || |
3669 | bs->on_write_error == BLOCK_ERR_STOP_ANY || | |
3670 | bs->on_read_error == BLOCK_ERR_STOP_ANY)); | |
3671 | } | |
3672 | ||
3673 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
3674 | { | |
d6bf279e | 3675 | bs->iostatus_enabled = false; |
28a7282a LC |
3676 | } |
3677 | ||
3678 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
3679 | { | |
3680 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 3681 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
3682 | } |
3683 | } | |
3684 | ||
3685 | /* XXX: Today this is set by device models because it makes the implementation | |
3686 | quite simple. However, the block layer knows about the error, so it's | |
3687 | possible to implement this without device models being involved */ | |
3688 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) | |
3689 | { | |
58e21ef5 LC |
3690 | if (bdrv_iostatus_is_enabled(bs) && |
3691 | bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
28a7282a | 3692 | assert(error >= 0); |
58e21ef5 LC |
3693 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
3694 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
3695 | } |
3696 | } | |
3697 | ||
a597e79c CH |
3698 | void |
3699 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
3700 | enum BlockAcctType type) | |
3701 | { | |
3702 | assert(type < BDRV_MAX_IOTYPE); | |
3703 | ||
3704 | cookie->bytes = bytes; | |
c488c7f6 | 3705 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
3706 | cookie->type = type; |
3707 | } | |
3708 | ||
3709 | void | |
3710 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
3711 | { | |
3712 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
3713 | ||
3714 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
3715 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 3716 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
3717 | } |
3718 | ||
f88e1a42 JS |
3719 | int bdrv_img_create(const char *filename, const char *fmt, |
3720 | const char *base_filename, const char *base_fmt, | |
3721 | char *options, uint64_t img_size, int flags) | |
3722 | { | |
3723 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 3724 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
3725 | BlockDriverState *bs = NULL; |
3726 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 3727 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
3728 | int ret = 0; |
3729 | ||
3730 | /* Find driver and parse its options */ | |
3731 | drv = bdrv_find_format(fmt); | |
3732 | if (!drv) { | |
3733 | error_report("Unknown file format '%s'", fmt); | |
4f70f249 | 3734 | ret = -EINVAL; |
f88e1a42 JS |
3735 | goto out; |
3736 | } | |
3737 | ||
3738 | proto_drv = bdrv_find_protocol(filename); | |
3739 | if (!proto_drv) { | |
3740 | error_report("Unknown protocol '%s'", filename); | |
4f70f249 | 3741 | ret = -EINVAL; |
f88e1a42 JS |
3742 | goto out; |
3743 | } | |
3744 | ||
3745 | create_options = append_option_parameters(create_options, | |
3746 | drv->create_options); | |
3747 | create_options = append_option_parameters(create_options, | |
3748 | proto_drv->create_options); | |
3749 | ||
3750 | /* Create parameter list with default values */ | |
3751 | param = parse_option_parameters("", create_options, param); | |
3752 | ||
3753 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
3754 | ||
3755 | /* Parse -o options */ | |
3756 | if (options) { | |
3757 | param = parse_option_parameters(options, create_options, param); | |
3758 | if (param == NULL) { | |
3759 | error_report("Invalid options for file format '%s'.", fmt); | |
4f70f249 | 3760 | ret = -EINVAL; |
f88e1a42 JS |
3761 | goto out; |
3762 | } | |
3763 | } | |
3764 | ||
3765 | if (base_filename) { | |
3766 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
3767 | base_filename)) { | |
3768 | error_report("Backing file not supported for file format '%s'", | |
3769 | fmt); | |
4f70f249 | 3770 | ret = -EINVAL; |
f88e1a42 JS |
3771 | goto out; |
3772 | } | |
3773 | } | |
3774 | ||
3775 | if (base_fmt) { | |
3776 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
3777 | error_report("Backing file format not supported for file " | |
3778 | "format '%s'", fmt); | |
4f70f249 | 3779 | ret = -EINVAL; |
f88e1a42 JS |
3780 | goto out; |
3781 | } | |
3782 | } | |
3783 | ||
792da93a JS |
3784 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
3785 | if (backing_file && backing_file->value.s) { | |
3786 | if (!strcmp(filename, backing_file->value.s)) { | |
3787 | error_report("Error: Trying to create an image with the " | |
3788 | "same filename as the backing file"); | |
4f70f249 | 3789 | ret = -EINVAL; |
792da93a JS |
3790 | goto out; |
3791 | } | |
3792 | } | |
3793 | ||
f88e1a42 JS |
3794 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
3795 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
3796 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
3797 | if (!backing_drv) { | |
f88e1a42 JS |
3798 | error_report("Unknown backing file format '%s'", |
3799 | backing_fmt->value.s); | |
4f70f249 | 3800 | ret = -EINVAL; |
f88e1a42 JS |
3801 | goto out; |
3802 | } | |
3803 | } | |
3804 | ||
3805 | // The size for the image must always be specified, with one exception: | |
3806 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
3807 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
3808 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
3809 | if (backing_file && backing_file->value.s) { |
3810 | uint64_t size; | |
f88e1a42 JS |
3811 | char buf[32]; |
3812 | ||
f88e1a42 JS |
3813 | bs = bdrv_new(""); |
3814 | ||
96df67d1 | 3815 | ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); |
f88e1a42 | 3816 | if (ret < 0) { |
96df67d1 | 3817 | error_report("Could not open '%s'", backing_file->value.s); |
f88e1a42 JS |
3818 | goto out; |
3819 | } | |
3820 | bdrv_get_geometry(bs, &size); | |
3821 | size *= 512; | |
3822 | ||
3823 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
3824 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
3825 | } else { | |
3826 | error_report("Image creation needs a size parameter"); | |
4f70f249 | 3827 | ret = -EINVAL; |
f88e1a42 JS |
3828 | goto out; |
3829 | } | |
3830 | } | |
3831 | ||
3832 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
3833 | print_option_parameters(param); | |
3834 | puts(""); | |
3835 | ||
3836 | ret = bdrv_create(drv, filename, param); | |
3837 | ||
3838 | if (ret < 0) { | |
3839 | if (ret == -ENOTSUP) { | |
3840 | error_report("Formatting or formatting option not supported for " | |
3841 | "file format '%s'", fmt); | |
3842 | } else if (ret == -EFBIG) { | |
3843 | error_report("The image size is too large for file format '%s'", | |
3844 | fmt); | |
3845 | } else { | |
3846 | error_report("%s: error while creating %s: %s", filename, fmt, | |
3847 | strerror(-ret)); | |
3848 | } | |
3849 | } | |
3850 | ||
3851 | out: | |
3852 | free_option_parameters(create_options); | |
3853 | free_option_parameters(param); | |
3854 | ||
3855 | if (bs) { | |
3856 | bdrv_delete(bs); | |
3857 | } | |
4f70f249 JS |
3858 | |
3859 | return ret; | |
f88e1a42 | 3860 | } |
eeec61f2 SH |
3861 | |
3862 | void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, | |
3863 | BlockDriverCompletionFunc *cb, void *opaque) | |
3864 | { | |
3865 | BlockJob *job; | |
3866 | ||
3867 | if (bs->job || bdrv_in_use(bs)) { | |
3868 | return NULL; | |
3869 | } | |
3870 | bdrv_set_in_use(bs, 1); | |
3871 | ||
3872 | job = g_malloc0(job_type->instance_size); | |
3873 | job->job_type = job_type; | |
3874 | job->bs = bs; | |
3875 | job->cb = cb; | |
3876 | job->opaque = opaque; | |
3877 | bs->job = job; | |
3878 | return job; | |
3879 | } | |
3880 | ||
3881 | void block_job_complete(BlockJob *job, int ret) | |
3882 | { | |
3883 | BlockDriverState *bs = job->bs; | |
3884 | ||
3885 | assert(bs->job == job); | |
3886 | job->cb(job->opaque, ret); | |
3887 | bs->job = NULL; | |
3888 | g_free(job); | |
3889 | bdrv_set_in_use(bs, 0); | |
3890 | } | |
3891 | ||
3892 | int block_job_set_speed(BlockJob *job, int64_t value) | |
3893 | { | |
3894 | if (!job->job_type->set_speed) { | |
3895 | return -ENOTSUP; | |
3896 | } | |
3897 | return job->job_type->set_speed(job, value); | |
3898 | } | |
3899 | ||
3900 | void block_job_cancel(BlockJob *job) | |
3901 | { | |
3902 | job->cancelled = true; | |
3903 | } | |
3904 | ||
3905 | bool block_job_is_cancelled(BlockJob *job) | |
3906 | { | |
3907 | return job->cancelled; | |
3908 | } |