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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, | |
f08f2dda | 53 | BDRV_REQ_ZERO_WRITE = 0x2, |
470c0504 SH |
54 | } BdrvRequestFlags; |
55 | ||
7d4b4ba5 | 56 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
57 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
58 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 59 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
60 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
61 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 62 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
63 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
64 | int64_t sector_num, int nb_sectors, | |
65 | QEMUIOVector *iov); | |
66 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
67 | int64_t sector_num, int nb_sectors, | |
68 | QEMUIOVector *iov); | |
c5fbe571 | 69 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
70 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
71 | BdrvRequestFlags flags); | |
1c9805a3 | 72 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
f08f2dda SH |
73 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
74 | BdrvRequestFlags flags); | |
b2a61371 SH |
75 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
76 | int64_t sector_num, | |
77 | QEMUIOVector *qiov, | |
78 | int nb_sectors, | |
79 | BlockDriverCompletionFunc *cb, | |
80 | void *opaque, | |
8c5873d6 | 81 | bool is_write); |
b2a61371 | 82 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 KW |
83 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
84 | int64_t sector_num, int nb_sectors); | |
ec530c81 | 85 | |
98f90dba ZYW |
86 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
87 | bool is_write, double elapsed_time, uint64_t *wait); | |
88 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
89 | double elapsed_time, uint64_t *wait); | |
90 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
91 | bool is_write, int64_t *wait); | |
92 | ||
1b7bdbc1 SH |
93 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
94 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 95 | |
8a22f02a SH |
96 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
97 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 98 | |
f9092b10 MA |
99 | /* The device to use for VM snapshots */ |
100 | static BlockDriverState *bs_snapshots; | |
101 | ||
eb852011 MA |
102 | /* If non-zero, use only whitelisted block drivers */ |
103 | static int use_bdrv_whitelist; | |
104 | ||
9e0b22f4 SH |
105 | #ifdef _WIN32 |
106 | static int is_windows_drive_prefix(const char *filename) | |
107 | { | |
108 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
109 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
110 | filename[1] == ':'); | |
111 | } | |
112 | ||
113 | int is_windows_drive(const char *filename) | |
114 | { | |
115 | if (is_windows_drive_prefix(filename) && | |
116 | filename[2] == '\0') | |
117 | return 1; | |
118 | if (strstart(filename, "\\\\.\\", NULL) || | |
119 | strstart(filename, "//./", NULL)) | |
120 | return 1; | |
121 | return 0; | |
122 | } | |
123 | #endif | |
124 | ||
0563e191 | 125 | /* throttling disk I/O limits */ |
98f90dba ZYW |
126 | void bdrv_io_limits_disable(BlockDriverState *bs) |
127 | { | |
128 | bs->io_limits_enabled = false; | |
129 | ||
130 | while (qemu_co_queue_next(&bs->throttled_reqs)); | |
131 | ||
132 | if (bs->block_timer) { | |
133 | qemu_del_timer(bs->block_timer); | |
134 | qemu_free_timer(bs->block_timer); | |
135 | bs->block_timer = NULL; | |
136 | } | |
137 | ||
138 | bs->slice_start = 0; | |
139 | bs->slice_end = 0; | |
140 | bs->slice_time = 0; | |
141 | memset(&bs->io_base, 0, sizeof(bs->io_base)); | |
142 | } | |
143 | ||
0563e191 ZYW |
144 | static void bdrv_block_timer(void *opaque) |
145 | { | |
146 | BlockDriverState *bs = opaque; | |
147 | ||
148 | qemu_co_queue_next(&bs->throttled_reqs); | |
149 | } | |
150 | ||
151 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
152 | { | |
153 | qemu_co_queue_init(&bs->throttled_reqs); | |
154 | bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); | |
155 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
156 | bs->slice_start = qemu_get_clock_ns(vm_clock); | |
157 | bs->slice_end = bs->slice_start + bs->slice_time; | |
158 | memset(&bs->io_base, 0, sizeof(bs->io_base)); | |
159 | bs->io_limits_enabled = true; | |
160 | } | |
161 | ||
162 | bool bdrv_io_limits_enabled(BlockDriverState *bs) | |
163 | { | |
164 | BlockIOLimit *io_limits = &bs->io_limits; | |
165 | return io_limits->bps[BLOCK_IO_LIMIT_READ] | |
166 | || io_limits->bps[BLOCK_IO_LIMIT_WRITE] | |
167 | || io_limits->bps[BLOCK_IO_LIMIT_TOTAL] | |
168 | || io_limits->iops[BLOCK_IO_LIMIT_READ] | |
169 | || io_limits->iops[BLOCK_IO_LIMIT_WRITE] | |
170 | || io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; | |
171 | } | |
172 | ||
98f90dba ZYW |
173 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
174 | bool is_write, int nb_sectors) | |
175 | { | |
176 | int64_t wait_time = -1; | |
177 | ||
178 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
179 | qemu_co_queue_wait(&bs->throttled_reqs); | |
180 | } | |
181 | ||
182 | /* In fact, we hope to keep each request's timing, in FIFO mode. The next | |
183 | * throttled requests will not be dequeued until the current request is | |
184 | * allowed to be serviced. So if the current request still exceeds the | |
185 | * limits, it will be inserted to the head. All requests followed it will | |
186 | * be still in throttled_reqs queue. | |
187 | */ | |
188 | ||
189 | while (bdrv_exceed_io_limits(bs, nb_sectors, is_write, &wait_time)) { | |
190 | qemu_mod_timer(bs->block_timer, | |
191 | wait_time + qemu_get_clock_ns(vm_clock)); | |
192 | qemu_co_queue_wait_insert_head(&bs->throttled_reqs); | |
193 | } | |
194 | ||
195 | qemu_co_queue_next(&bs->throttled_reqs); | |
196 | } | |
197 | ||
9e0b22f4 SH |
198 | /* check if the path starts with "<protocol>:" */ |
199 | static int path_has_protocol(const char *path) | |
200 | { | |
201 | #ifdef _WIN32 | |
202 | if (is_windows_drive(path) || | |
203 | is_windows_drive_prefix(path)) { | |
204 | return 0; | |
205 | } | |
206 | #endif | |
207 | ||
208 | return strchr(path, ':') != NULL; | |
209 | } | |
210 | ||
83f64091 | 211 | int path_is_absolute(const char *path) |
3b0d4f61 | 212 | { |
83f64091 | 213 | const char *p; |
21664424 FB |
214 | #ifdef _WIN32 |
215 | /* specific case for names like: "\\.\d:" */ | |
216 | if (*path == '/' || *path == '\\') | |
217 | return 1; | |
218 | #endif | |
83f64091 FB |
219 | p = strchr(path, ':'); |
220 | if (p) | |
221 | p++; | |
222 | else | |
223 | p = path; | |
3b9f94e1 FB |
224 | #ifdef _WIN32 |
225 | return (*p == '/' || *p == '\\'); | |
226 | #else | |
227 | return (*p == '/'); | |
228 | #endif | |
3b0d4f61 FB |
229 | } |
230 | ||
83f64091 FB |
231 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
232 | path to it by considering it is relative to base_path. URL are | |
233 | supported. */ | |
234 | void path_combine(char *dest, int dest_size, | |
235 | const char *base_path, | |
236 | const char *filename) | |
3b0d4f61 | 237 | { |
83f64091 FB |
238 | const char *p, *p1; |
239 | int len; | |
240 | ||
241 | if (dest_size <= 0) | |
242 | return; | |
243 | if (path_is_absolute(filename)) { | |
244 | pstrcpy(dest, dest_size, filename); | |
245 | } else { | |
246 | p = strchr(base_path, ':'); | |
247 | if (p) | |
248 | p++; | |
249 | else | |
250 | p = base_path; | |
3b9f94e1 FB |
251 | p1 = strrchr(base_path, '/'); |
252 | #ifdef _WIN32 | |
253 | { | |
254 | const char *p2; | |
255 | p2 = strrchr(base_path, '\\'); | |
256 | if (!p1 || p2 > p1) | |
257 | p1 = p2; | |
258 | } | |
259 | #endif | |
83f64091 FB |
260 | if (p1) |
261 | p1++; | |
262 | else | |
263 | p1 = base_path; | |
264 | if (p1 > p) | |
265 | p = p1; | |
266 | len = p - base_path; | |
267 | if (len > dest_size - 1) | |
268 | len = dest_size - 1; | |
269 | memcpy(dest, base_path, len); | |
270 | dest[len] = '\0'; | |
271 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 272 | } |
3b0d4f61 FB |
273 | } |
274 | ||
5efa9d5a | 275 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 276 | { |
8c5873d6 SH |
277 | /* Block drivers without coroutine functions need emulation */ |
278 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
279 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
280 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
281 | ||
f8c35c1d SH |
282 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
283 | * the block driver lacks aio we need to emulate that too. | |
284 | */ | |
f9f05dc5 KW |
285 | if (!bdrv->bdrv_aio_readv) { |
286 | /* add AIO emulation layer */ | |
287 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
288 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 289 | } |
83f64091 | 290 | } |
b2e12bc6 | 291 | |
8a22f02a | 292 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 293 | } |
b338082b FB |
294 | |
295 | /* create a new block device (by default it is empty) */ | |
296 | BlockDriverState *bdrv_new(const char *device_name) | |
297 | { | |
1b7bdbc1 | 298 | BlockDriverState *bs; |
b338082b | 299 | |
7267c094 | 300 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 301 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 302 | if (device_name[0] != '\0') { |
1b7bdbc1 | 303 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 304 | } |
28a7282a | 305 | bdrv_iostatus_disable(bs); |
b338082b FB |
306 | return bs; |
307 | } | |
308 | ||
ea2384d3 FB |
309 | BlockDriver *bdrv_find_format(const char *format_name) |
310 | { | |
311 | BlockDriver *drv1; | |
8a22f02a SH |
312 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
313 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 314 | return drv1; |
8a22f02a | 315 | } |
ea2384d3 FB |
316 | } |
317 | return NULL; | |
318 | } | |
319 | ||
eb852011 MA |
320 | static int bdrv_is_whitelisted(BlockDriver *drv) |
321 | { | |
322 | static const char *whitelist[] = { | |
323 | CONFIG_BDRV_WHITELIST | |
324 | }; | |
325 | const char **p; | |
326 | ||
327 | if (!whitelist[0]) | |
328 | return 1; /* no whitelist, anything goes */ | |
329 | ||
330 | for (p = whitelist; *p; p++) { | |
331 | if (!strcmp(drv->format_name, *p)) { | |
332 | return 1; | |
333 | } | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
338 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
339 | { | |
340 | BlockDriver *drv = bdrv_find_format(format_name); | |
341 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
342 | } | |
343 | ||
5b7e1542 ZYW |
344 | typedef struct CreateCo { |
345 | BlockDriver *drv; | |
346 | char *filename; | |
347 | QEMUOptionParameter *options; | |
348 | int ret; | |
349 | } CreateCo; | |
350 | ||
351 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
352 | { | |
353 | CreateCo *cco = opaque; | |
354 | assert(cco->drv); | |
355 | ||
356 | cco->ret = cco->drv->bdrv_create(cco->filename, cco->options); | |
357 | } | |
358 | ||
0e7e1989 KW |
359 | int bdrv_create(BlockDriver *drv, const char* filename, |
360 | QEMUOptionParameter *options) | |
ea2384d3 | 361 | { |
5b7e1542 ZYW |
362 | int ret; |
363 | ||
364 | Coroutine *co; | |
365 | CreateCo cco = { | |
366 | .drv = drv, | |
367 | .filename = g_strdup(filename), | |
368 | .options = options, | |
369 | .ret = NOT_DONE, | |
370 | }; | |
371 | ||
372 | if (!drv->bdrv_create) { | |
ea2384d3 | 373 | return -ENOTSUP; |
5b7e1542 ZYW |
374 | } |
375 | ||
376 | if (qemu_in_coroutine()) { | |
377 | /* Fast-path if already in coroutine context */ | |
378 | bdrv_create_co_entry(&cco); | |
379 | } else { | |
380 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
381 | qemu_coroutine_enter(co, &cco); | |
382 | while (cco.ret == NOT_DONE) { | |
383 | qemu_aio_wait(); | |
384 | } | |
385 | } | |
386 | ||
387 | ret = cco.ret; | |
388 | g_free(cco.filename); | |
0e7e1989 | 389 | |
5b7e1542 | 390 | return ret; |
ea2384d3 FB |
391 | } |
392 | ||
84a12e66 CH |
393 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
394 | { | |
395 | BlockDriver *drv; | |
396 | ||
b50cbabc | 397 | drv = bdrv_find_protocol(filename); |
84a12e66 | 398 | if (drv == NULL) { |
16905d71 | 399 | return -ENOENT; |
84a12e66 CH |
400 | } |
401 | ||
402 | return bdrv_create(drv, filename, options); | |
403 | } | |
404 | ||
d5249393 | 405 | #ifdef _WIN32 |
95389c86 | 406 | void get_tmp_filename(char *filename, int size) |
d5249393 | 407 | { |
3b9f94e1 | 408 | char temp_dir[MAX_PATH]; |
3b46e624 | 409 | |
3b9f94e1 FB |
410 | GetTempPath(MAX_PATH, temp_dir); |
411 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
412 | } |
413 | #else | |
95389c86 | 414 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 415 | { |
67b915a5 | 416 | int fd; |
7ccfb2eb | 417 | const char *tmpdir; |
d5249393 | 418 | /* XXX: race condition possible */ |
0badc1ee AJ |
419 | tmpdir = getenv("TMPDIR"); |
420 | if (!tmpdir) | |
421 | tmpdir = "/tmp"; | |
422 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
423 | fd = mkstemp(filename); |
424 | close(fd); | |
425 | } | |
d5249393 | 426 | #endif |
fc01f7e7 | 427 | |
84a12e66 CH |
428 | /* |
429 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
430 | * recognized as a host CDROM. | |
431 | */ | |
432 | static BlockDriver *find_hdev_driver(const char *filename) | |
433 | { | |
434 | int score_max = 0, score; | |
435 | BlockDriver *drv = NULL, *d; | |
436 | ||
437 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
438 | if (d->bdrv_probe_device) { | |
439 | score = d->bdrv_probe_device(filename); | |
440 | if (score > score_max) { | |
441 | score_max = score; | |
442 | drv = d; | |
443 | } | |
444 | } | |
445 | } | |
446 | ||
447 | return drv; | |
448 | } | |
449 | ||
b50cbabc | 450 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
451 | { |
452 | BlockDriver *drv1; | |
453 | char protocol[128]; | |
1cec71e3 | 454 | int len; |
83f64091 | 455 | const char *p; |
19cb3738 | 456 | |
66f82cee KW |
457 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
458 | ||
39508e7a CH |
459 | /* |
460 | * XXX(hch): we really should not let host device detection | |
461 | * override an explicit protocol specification, but moving this | |
462 | * later breaks access to device names with colons in them. | |
463 | * Thanks to the brain-dead persistent naming schemes on udev- | |
464 | * based Linux systems those actually are quite common. | |
465 | */ | |
466 | drv1 = find_hdev_driver(filename); | |
467 | if (drv1) { | |
468 | return drv1; | |
469 | } | |
470 | ||
9e0b22f4 | 471 | if (!path_has_protocol(filename)) { |
39508e7a | 472 | return bdrv_find_format("file"); |
84a12e66 | 473 | } |
9e0b22f4 SH |
474 | p = strchr(filename, ':'); |
475 | assert(p != NULL); | |
1cec71e3 AL |
476 | len = p - filename; |
477 | if (len > sizeof(protocol) - 1) | |
478 | len = sizeof(protocol) - 1; | |
479 | memcpy(protocol, filename, len); | |
480 | protocol[len] = '\0'; | |
8a22f02a | 481 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 482 | if (drv1->protocol_name && |
8a22f02a | 483 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 484 | return drv1; |
8a22f02a | 485 | } |
83f64091 FB |
486 | } |
487 | return NULL; | |
488 | } | |
489 | ||
c98ac35d | 490 | static int find_image_format(const char *filename, BlockDriver **pdrv) |
f3a5d3f8 CH |
491 | { |
492 | int ret, score, score_max; | |
493 | BlockDriver *drv1, *drv; | |
494 | uint8_t buf[2048]; | |
495 | BlockDriverState *bs; | |
496 | ||
f5edb014 | 497 | ret = bdrv_file_open(&bs, filename, 0); |
c98ac35d SW |
498 | if (ret < 0) { |
499 | *pdrv = NULL; | |
500 | return ret; | |
501 | } | |
f8ea0b00 | 502 | |
08a00559 KW |
503 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
504 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
1a396859 | 505 | bdrv_delete(bs); |
c98ac35d SW |
506 | drv = bdrv_find_format("raw"); |
507 | if (!drv) { | |
508 | ret = -ENOENT; | |
509 | } | |
510 | *pdrv = drv; | |
511 | return ret; | |
1a396859 | 512 | } |
f8ea0b00 | 513 | |
83f64091 FB |
514 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
515 | bdrv_delete(bs); | |
516 | if (ret < 0) { | |
c98ac35d SW |
517 | *pdrv = NULL; |
518 | return ret; | |
83f64091 FB |
519 | } |
520 | ||
ea2384d3 | 521 | score_max = 0; |
84a12e66 | 522 | drv = NULL; |
8a22f02a | 523 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
524 | if (drv1->bdrv_probe) { |
525 | score = drv1->bdrv_probe(buf, ret, filename); | |
526 | if (score > score_max) { | |
527 | score_max = score; | |
528 | drv = drv1; | |
529 | } | |
0849bf08 | 530 | } |
fc01f7e7 | 531 | } |
c98ac35d SW |
532 | if (!drv) { |
533 | ret = -ENOENT; | |
534 | } | |
535 | *pdrv = drv; | |
536 | return ret; | |
ea2384d3 FB |
537 | } |
538 | ||
51762288 SH |
539 | /** |
540 | * Set the current 'total_sectors' value | |
541 | */ | |
542 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
543 | { | |
544 | BlockDriver *drv = bs->drv; | |
545 | ||
396759ad NB |
546 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
547 | if (bs->sg) | |
548 | return 0; | |
549 | ||
51762288 SH |
550 | /* query actual device if possible, otherwise just trust the hint */ |
551 | if (drv->bdrv_getlength) { | |
552 | int64_t length = drv->bdrv_getlength(bs); | |
553 | if (length < 0) { | |
554 | return length; | |
555 | } | |
556 | hint = length >> BDRV_SECTOR_BITS; | |
557 | } | |
558 | ||
559 | bs->total_sectors = hint; | |
560 | return 0; | |
561 | } | |
562 | ||
c3993cdc SH |
563 | /** |
564 | * Set open flags for a given cache mode | |
565 | * | |
566 | * Return 0 on success, -1 if the cache mode was invalid. | |
567 | */ | |
568 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
569 | { | |
570 | *flags &= ~BDRV_O_CACHE_MASK; | |
571 | ||
572 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
573 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
574 | } else if (!strcmp(mode, "directsync")) { |
575 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
576 | } else if (!strcmp(mode, "writeback")) { |
577 | *flags |= BDRV_O_CACHE_WB; | |
578 | } else if (!strcmp(mode, "unsafe")) { | |
579 | *flags |= BDRV_O_CACHE_WB; | |
580 | *flags |= BDRV_O_NO_FLUSH; | |
581 | } else if (!strcmp(mode, "writethrough")) { | |
582 | /* this is the default */ | |
583 | } else { | |
584 | return -1; | |
585 | } | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
53fec9d3 SH |
590 | /** |
591 | * The copy-on-read flag is actually a reference count so multiple users may | |
592 | * use the feature without worrying about clobbering its previous state. | |
593 | * Copy-on-read stays enabled until all users have called to disable it. | |
594 | */ | |
595 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
596 | { | |
597 | bs->copy_on_read++; | |
598 | } | |
599 | ||
600 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
601 | { | |
602 | assert(bs->copy_on_read > 0); | |
603 | bs->copy_on_read--; | |
604 | } | |
605 | ||
57915332 KW |
606 | /* |
607 | * Common part for opening disk images and files | |
608 | */ | |
609 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
610 | int flags, BlockDriver *drv) | |
611 | { | |
612 | int ret, open_flags; | |
613 | ||
614 | assert(drv != NULL); | |
615 | ||
28dcee10 SH |
616 | trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
617 | ||
66f82cee | 618 | bs->file = NULL; |
51762288 | 619 | bs->total_sectors = 0; |
57915332 KW |
620 | bs->encrypted = 0; |
621 | bs->valid_key = 0; | |
03f541bd | 622 | bs->sg = 0; |
57915332 | 623 | bs->open_flags = flags; |
03f541bd | 624 | bs->growable = 0; |
57915332 KW |
625 | bs->buffer_alignment = 512; |
626 | ||
53fec9d3 SH |
627 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
628 | if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) { | |
629 | bdrv_enable_copy_on_read(bs); | |
630 | } | |
631 | ||
57915332 | 632 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
03f541bd | 633 | bs->backing_file[0] = '\0'; |
57915332 KW |
634 | |
635 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
636 | return -ENOTSUP; | |
637 | } | |
638 | ||
639 | bs->drv = drv; | |
7267c094 | 640 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 641 | |
03f541bd | 642 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
57915332 KW |
643 | |
644 | /* | |
645 | * Clear flags that are internal to the block layer before opening the | |
646 | * image. | |
647 | */ | |
648 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
649 | ||
650 | /* | |
ebabb67a | 651 | * Snapshots should be writable. |
57915332 KW |
652 | */ |
653 | if (bs->is_temporary) { | |
654 | open_flags |= BDRV_O_RDWR; | |
655 | } | |
656 | ||
e7c63796 SH |
657 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
658 | ||
66f82cee KW |
659 | /* Open the image, either directly or using a protocol */ |
660 | if (drv->bdrv_file_open) { | |
661 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
662 | } else { | |
663 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
664 | if (ret >= 0) { | |
665 | ret = drv->bdrv_open(bs, open_flags); | |
666 | } | |
667 | } | |
668 | ||
57915332 KW |
669 | if (ret < 0) { |
670 | goto free_and_fail; | |
671 | } | |
672 | ||
51762288 SH |
673 | ret = refresh_total_sectors(bs, bs->total_sectors); |
674 | if (ret < 0) { | |
675 | goto free_and_fail; | |
57915332 | 676 | } |
51762288 | 677 | |
57915332 KW |
678 | #ifndef _WIN32 |
679 | if (bs->is_temporary) { | |
680 | unlink(filename); | |
681 | } | |
682 | #endif | |
683 | return 0; | |
684 | ||
685 | free_and_fail: | |
66f82cee KW |
686 | if (bs->file) { |
687 | bdrv_delete(bs->file); | |
688 | bs->file = NULL; | |
689 | } | |
7267c094 | 690 | g_free(bs->opaque); |
57915332 KW |
691 | bs->opaque = NULL; |
692 | bs->drv = NULL; | |
693 | return ret; | |
694 | } | |
695 | ||
b6ce07aa KW |
696 | /* |
697 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
698 | */ | |
83f64091 | 699 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 700 | { |
83f64091 | 701 | BlockDriverState *bs; |
6db95603 | 702 | BlockDriver *drv; |
83f64091 FB |
703 | int ret; |
704 | ||
b50cbabc | 705 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
706 | if (!drv) { |
707 | return -ENOENT; | |
708 | } | |
709 | ||
83f64091 | 710 | bs = bdrv_new(""); |
b6ce07aa | 711 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
712 | if (ret < 0) { |
713 | bdrv_delete(bs); | |
714 | return ret; | |
3b0d4f61 | 715 | } |
71d0770c | 716 | bs->growable = 1; |
83f64091 FB |
717 | *pbs = bs; |
718 | return 0; | |
719 | } | |
720 | ||
b6ce07aa KW |
721 | /* |
722 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
723 | */ | |
d6e9098e KW |
724 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
725 | BlockDriver *drv) | |
ea2384d3 | 726 | { |
b6ce07aa | 727 | int ret; |
2b572816 | 728 | char tmp_filename[PATH_MAX]; |
712e7874 | 729 | |
83f64091 | 730 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
731 | BlockDriverState *bs1; |
732 | int64_t total_size; | |
7c96d46e | 733 | int is_protocol = 0; |
91a073a9 KW |
734 | BlockDriver *bdrv_qcow2; |
735 | QEMUOptionParameter *options; | |
b6ce07aa | 736 | char backing_filename[PATH_MAX]; |
3b46e624 | 737 | |
ea2384d3 FB |
738 | /* if snapshot, we create a temporary backing file and open it |
739 | instead of opening 'filename' directly */ | |
33e3963e | 740 | |
ea2384d3 FB |
741 | /* if there is a backing file, use it */ |
742 | bs1 = bdrv_new(""); | |
d6e9098e | 743 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 744 | if (ret < 0) { |
ea2384d3 | 745 | bdrv_delete(bs1); |
51d7c00c | 746 | return ret; |
ea2384d3 | 747 | } |
3e82990b | 748 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
749 | |
750 | if (bs1->drv && bs1->drv->protocol_name) | |
751 | is_protocol = 1; | |
752 | ||
ea2384d3 | 753 | bdrv_delete(bs1); |
3b46e624 | 754 | |
ea2384d3 | 755 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
756 | |
757 | /* Real path is meaningless for protocols */ | |
758 | if (is_protocol) | |
759 | snprintf(backing_filename, sizeof(backing_filename), | |
760 | "%s", filename); | |
114cdfa9 KS |
761 | else if (!realpath(filename, backing_filename)) |
762 | return -errno; | |
7c96d46e | 763 | |
91a073a9 KW |
764 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
765 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
766 | ||
3e82990b | 767 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
768 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
769 | if (drv) { | |
770 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
771 | drv->format_name); | |
772 | } | |
773 | ||
774 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 775 | free_option_parameters(options); |
51d7c00c AL |
776 | if (ret < 0) { |
777 | return ret; | |
ea2384d3 | 778 | } |
91a073a9 | 779 | |
ea2384d3 | 780 | filename = tmp_filename; |
91a073a9 | 781 | drv = bdrv_qcow2; |
ea2384d3 FB |
782 | bs->is_temporary = 1; |
783 | } | |
712e7874 | 784 | |
b6ce07aa | 785 | /* Find the right image format driver */ |
6db95603 | 786 | if (!drv) { |
c98ac35d | 787 | ret = find_image_format(filename, &drv); |
51d7c00c | 788 | } |
6987307c | 789 | |
51d7c00c | 790 | if (!drv) { |
51d7c00c | 791 | goto unlink_and_fail; |
ea2384d3 | 792 | } |
b6ce07aa KW |
793 | |
794 | /* Open the image */ | |
795 | ret = bdrv_open_common(bs, filename, flags, drv); | |
796 | if (ret < 0) { | |
6987307c CH |
797 | goto unlink_and_fail; |
798 | } | |
799 | ||
b6ce07aa KW |
800 | /* If there is a backing file, use it */ |
801 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
802 | char backing_filename[PATH_MAX]; | |
803 | int back_flags; | |
804 | BlockDriver *back_drv = NULL; | |
805 | ||
806 | bs->backing_hd = bdrv_new(""); | |
df2dbb4a SH |
807 | |
808 | if (path_has_protocol(bs->backing_file)) { | |
809 | pstrcpy(backing_filename, sizeof(backing_filename), | |
810 | bs->backing_file); | |
811 | } else { | |
812 | path_combine(backing_filename, sizeof(backing_filename), | |
813 | filename, bs->backing_file); | |
814 | } | |
815 | ||
816 | if (bs->backing_format[0] != '\0') { | |
b6ce07aa | 817 | back_drv = bdrv_find_format(bs->backing_format); |
df2dbb4a | 818 | } |
b6ce07aa KW |
819 | |
820 | /* backing files always opened read-only */ | |
821 | back_flags = | |
822 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
823 | ||
824 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
825 | if (ret < 0) { | |
826 | bdrv_close(bs); | |
827 | return ret; | |
828 | } | |
829 | if (bs->is_temporary) { | |
830 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
831 | } else { | |
832 | /* base image inherits from "parent" */ | |
833 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
834 | } | |
835 | } | |
836 | ||
837 | if (!bdrv_key_required(bs)) { | |
7d4b4ba5 | 838 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
839 | } |
840 | ||
98f90dba ZYW |
841 | /* throttling disk I/O limits */ |
842 | if (bs->io_limits_enabled) { | |
843 | bdrv_io_limits_enable(bs); | |
844 | } | |
845 | ||
b6ce07aa KW |
846 | return 0; |
847 | ||
848 | unlink_and_fail: | |
849 | if (bs->is_temporary) { | |
850 | unlink(filename); | |
851 | } | |
852 | return ret; | |
853 | } | |
854 | ||
fc01f7e7 FB |
855 | void bdrv_close(BlockDriverState *bs) |
856 | { | |
80ccf93b | 857 | bdrv_flush(bs); |
19cb3738 | 858 | if (bs->drv) { |
3e914655 PB |
859 | if (bs->job) { |
860 | block_job_cancel_sync(bs->job); | |
861 | } | |
7094f12f KW |
862 | bdrv_drain_all(); |
863 | ||
f9092b10 MA |
864 | if (bs == bs_snapshots) { |
865 | bs_snapshots = NULL; | |
866 | } | |
557df6ac | 867 | if (bs->backing_hd) { |
ea2384d3 | 868 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
869 | bs->backing_hd = NULL; |
870 | } | |
ea2384d3 | 871 | bs->drv->bdrv_close(bs); |
7267c094 | 872 | g_free(bs->opaque); |
ea2384d3 FB |
873 | #ifdef _WIN32 |
874 | if (bs->is_temporary) { | |
875 | unlink(bs->filename); | |
876 | } | |
67b915a5 | 877 | #endif |
ea2384d3 FB |
878 | bs->opaque = NULL; |
879 | bs->drv = NULL; | |
53fec9d3 | 880 | bs->copy_on_read = 0; |
a275fa42 PB |
881 | bs->backing_file[0] = '\0'; |
882 | bs->backing_format[0] = '\0'; | |
b338082b | 883 | |
66f82cee | 884 | if (bs->file != NULL) { |
0ac9377d PB |
885 | bdrv_delete(bs->file); |
886 | bs->file = NULL; | |
66f82cee KW |
887 | } |
888 | ||
7d4b4ba5 | 889 | bdrv_dev_change_media_cb(bs, false); |
b338082b | 890 | } |
98f90dba ZYW |
891 | |
892 | /*throttling disk I/O limits*/ | |
893 | if (bs->io_limits_enabled) { | |
894 | bdrv_io_limits_disable(bs); | |
895 | } | |
b338082b FB |
896 | } |
897 | ||
2bc93fed MK |
898 | void bdrv_close_all(void) |
899 | { | |
900 | BlockDriverState *bs; | |
901 | ||
902 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
903 | bdrv_close(bs); | |
904 | } | |
905 | } | |
906 | ||
922453bc SH |
907 | /* |
908 | * Wait for pending requests to complete across all BlockDriverStates | |
909 | * | |
910 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
911 | * after calling this function. | |
4c355d53 ZYW |
912 | * |
913 | * Note that completion of an asynchronous I/O operation can trigger any | |
914 | * number of other I/O operations on other devices---for example a coroutine | |
915 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
916 | * coroutine is complete. Because of this, it is not possible to have a | |
917 | * function to drain a single device's I/O queue. | |
922453bc SH |
918 | */ |
919 | void bdrv_drain_all(void) | |
920 | { | |
921 | BlockDriverState *bs; | |
4c355d53 ZYW |
922 | bool busy; |
923 | ||
924 | do { | |
925 | busy = qemu_aio_wait(); | |
922453bc | 926 | |
4c355d53 ZYW |
927 | /* FIXME: We do not have timer support here, so this is effectively |
928 | * a busy wait. | |
929 | */ | |
930 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
931 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
932 | qemu_co_queue_restart_all(&bs->throttled_reqs); | |
933 | busy = true; | |
934 | } | |
935 | } | |
936 | } while (busy); | |
922453bc SH |
937 | |
938 | /* If requests are still pending there is a bug somewhere */ | |
939 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
940 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
941 | assert(qemu_co_queue_empty(&bs->throttled_reqs)); | |
942 | } | |
943 | } | |
944 | ||
d22b2f41 RH |
945 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
946 | Also, NULL terminate the device_name to prevent double remove */ | |
947 | void bdrv_make_anon(BlockDriverState *bs) | |
948 | { | |
949 | if (bs->device_name[0] != '\0') { | |
950 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
951 | } | |
952 | bs->device_name[0] = '\0'; | |
953 | } | |
954 | ||
e023b2e2 PB |
955 | static void bdrv_rebind(BlockDriverState *bs) |
956 | { | |
957 | if (bs->drv && bs->drv->bdrv_rebind) { | |
958 | bs->drv->bdrv_rebind(bs); | |
959 | } | |
960 | } | |
961 | ||
8802d1fd JC |
962 | /* |
963 | * Add new bs contents at the top of an image chain while the chain is | |
964 | * live, while keeping required fields on the top layer. | |
965 | * | |
966 | * This will modify the BlockDriverState fields, and swap contents | |
967 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
968 | * | |
f6801b83 JC |
969 | * bs_new is required to be anonymous. |
970 | * | |
8802d1fd JC |
971 | * This function does not create any image files. |
972 | */ | |
973 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
974 | { | |
975 | BlockDriverState tmp; | |
976 | ||
f6801b83 JC |
977 | /* bs_new must be anonymous */ |
978 | assert(bs_new->device_name[0] == '\0'); | |
8802d1fd JC |
979 | |
980 | tmp = *bs_new; | |
981 | ||
982 | /* there are some fields that need to stay on the top layer: */ | |
3a389e79 | 983 | tmp.open_flags = bs_top->open_flags; |
8802d1fd JC |
984 | |
985 | /* dev info */ | |
986 | tmp.dev_ops = bs_top->dev_ops; | |
987 | tmp.dev_opaque = bs_top->dev_opaque; | |
988 | tmp.dev = bs_top->dev; | |
989 | tmp.buffer_alignment = bs_top->buffer_alignment; | |
990 | tmp.copy_on_read = bs_top->copy_on_read; | |
991 | ||
992 | /* i/o timing parameters */ | |
993 | tmp.slice_time = bs_top->slice_time; | |
994 | tmp.slice_start = bs_top->slice_start; | |
995 | tmp.slice_end = bs_top->slice_end; | |
996 | tmp.io_limits = bs_top->io_limits; | |
997 | tmp.io_base = bs_top->io_base; | |
998 | tmp.throttled_reqs = bs_top->throttled_reqs; | |
999 | tmp.block_timer = bs_top->block_timer; | |
1000 | tmp.io_limits_enabled = bs_top->io_limits_enabled; | |
1001 | ||
1002 | /* geometry */ | |
1003 | tmp.cyls = bs_top->cyls; | |
1004 | tmp.heads = bs_top->heads; | |
1005 | tmp.secs = bs_top->secs; | |
1006 | tmp.translation = bs_top->translation; | |
1007 | ||
1008 | /* r/w error */ | |
1009 | tmp.on_read_error = bs_top->on_read_error; | |
1010 | tmp.on_write_error = bs_top->on_write_error; | |
1011 | ||
1012 | /* i/o status */ | |
1013 | tmp.iostatus_enabled = bs_top->iostatus_enabled; | |
1014 | tmp.iostatus = bs_top->iostatus; | |
1015 | ||
1016 | /* keep the same entry in bdrv_states */ | |
1017 | pstrcpy(tmp.device_name, sizeof(tmp.device_name), bs_top->device_name); | |
1018 | tmp.list = bs_top->list; | |
1019 | ||
1020 | /* The contents of 'tmp' will become bs_top, as we are | |
1021 | * swapping bs_new and bs_top contents. */ | |
1022 | tmp.backing_hd = bs_new; | |
1023 | pstrcpy(tmp.backing_file, sizeof(tmp.backing_file), bs_top->filename); | |
f6801b83 | 1024 | bdrv_get_format(bs_top, tmp.backing_format, sizeof(tmp.backing_format)); |
8802d1fd JC |
1025 | |
1026 | /* swap contents of the fixed new bs and the current top */ | |
1027 | *bs_new = *bs_top; | |
1028 | *bs_top = tmp; | |
1029 | ||
f6801b83 JC |
1030 | /* device_name[] was carried over from the old bs_top. bs_new |
1031 | * shouldn't be in bdrv_states, so we need to make device_name[] | |
1032 | * reflect the anonymity of bs_new | |
1033 | */ | |
1034 | bs_new->device_name[0] = '\0'; | |
1035 | ||
8802d1fd JC |
1036 | /* clear the copied fields in the new backing file */ |
1037 | bdrv_detach_dev(bs_new, bs_new->dev); | |
1038 | ||
1039 | qemu_co_queue_init(&bs_new->throttled_reqs); | |
1040 | memset(&bs_new->io_base, 0, sizeof(bs_new->io_base)); | |
1041 | memset(&bs_new->io_limits, 0, sizeof(bs_new->io_limits)); | |
1042 | bdrv_iostatus_disable(bs_new); | |
1043 | ||
1044 | /* we don't use bdrv_io_limits_disable() for this, because we don't want | |
1045 | * to affect or delete the block_timer, as it has been moved to bs_top */ | |
1046 | bs_new->io_limits_enabled = false; | |
1047 | bs_new->block_timer = NULL; | |
1048 | bs_new->slice_time = 0; | |
1049 | bs_new->slice_start = 0; | |
1050 | bs_new->slice_end = 0; | |
e023b2e2 PB |
1051 | |
1052 | bdrv_rebind(bs_new); | |
1053 | bdrv_rebind(bs_top); | |
8802d1fd JC |
1054 | } |
1055 | ||
b338082b FB |
1056 | void bdrv_delete(BlockDriverState *bs) |
1057 | { | |
fa879d62 | 1058 | assert(!bs->dev); |
3e914655 PB |
1059 | assert(!bs->job); |
1060 | assert(!bs->in_use); | |
18846dee | 1061 | |
1b7bdbc1 | 1062 | /* remove from list, if necessary */ |
d22b2f41 | 1063 | bdrv_make_anon(bs); |
34c6f050 | 1064 | |
b338082b | 1065 | bdrv_close(bs); |
66f82cee | 1066 | |
f9092b10 | 1067 | assert(bs != bs_snapshots); |
7267c094 | 1068 | g_free(bs); |
fc01f7e7 FB |
1069 | } |
1070 | ||
fa879d62 MA |
1071 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1072 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1073 | { |
fa879d62 | 1074 | if (bs->dev) { |
18846dee MA |
1075 | return -EBUSY; |
1076 | } | |
fa879d62 | 1077 | bs->dev = dev; |
28a7282a | 1078 | bdrv_iostatus_reset(bs); |
18846dee MA |
1079 | return 0; |
1080 | } | |
1081 | ||
fa879d62 MA |
1082 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1083 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1084 | { |
fa879d62 MA |
1085 | if (bdrv_attach_dev(bs, dev) < 0) { |
1086 | abort(); | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1091 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1092 | { | |
1093 | assert(bs->dev == dev); | |
1094 | bs->dev = NULL; | |
0e49de52 MA |
1095 | bs->dev_ops = NULL; |
1096 | bs->dev_opaque = NULL; | |
29e05f20 | 1097 | bs->buffer_alignment = 512; |
18846dee MA |
1098 | } |
1099 | ||
fa879d62 MA |
1100 | /* TODO change to return DeviceState * when all users are qdevified */ |
1101 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1102 | { |
fa879d62 | 1103 | return bs->dev; |
18846dee MA |
1104 | } |
1105 | ||
0e49de52 MA |
1106 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1107 | void *opaque) | |
1108 | { | |
1109 | bs->dev_ops = ops; | |
1110 | bs->dev_opaque = opaque; | |
2c6942fa MA |
1111 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
1112 | bs_snapshots = NULL; | |
1113 | } | |
0e49de52 MA |
1114 | } |
1115 | ||
329c0a48 LC |
1116 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1117 | BlockQMPEventAction action, int is_read) | |
1118 | { | |
1119 | QObject *data; | |
1120 | const char *action_str; | |
1121 | ||
1122 | switch (action) { | |
1123 | case BDRV_ACTION_REPORT: | |
1124 | action_str = "report"; | |
1125 | break; | |
1126 | case BDRV_ACTION_IGNORE: | |
1127 | action_str = "ignore"; | |
1128 | break; | |
1129 | case BDRV_ACTION_STOP: | |
1130 | action_str = "stop"; | |
1131 | break; | |
1132 | default: | |
1133 | abort(); | |
1134 | } | |
1135 | ||
1136 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1137 | bdrv->device_name, | |
1138 | action_str, | |
1139 | is_read ? "read" : "write"); | |
1140 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1141 | ||
1142 | qobject_decref(data); | |
1143 | } | |
1144 | ||
6f382ed2 LC |
1145 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1146 | { | |
1147 | QObject *data; | |
1148 | ||
1149 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1150 | bdrv_get_device_name(bs), ejected); | |
1151 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1152 | ||
1153 | qobject_decref(data); | |
1154 | } | |
1155 | ||
7d4b4ba5 | 1156 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1157 | { |
145feb17 | 1158 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1159 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1160 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1161 | if (tray_was_closed) { |
1162 | /* tray open */ | |
1163 | bdrv_emit_qmp_eject_event(bs, true); | |
1164 | } | |
1165 | if (load) { | |
1166 | /* tray close */ | |
1167 | bdrv_emit_qmp_eject_event(bs, false); | |
1168 | } | |
145feb17 MA |
1169 | } |
1170 | } | |
1171 | ||
2c6942fa MA |
1172 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1173 | { | |
1174 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1175 | } | |
1176 | ||
025ccaa7 PB |
1177 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1178 | { | |
1179 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1180 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1181 | } | |
1182 | } | |
1183 | ||
e4def80b MA |
1184 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1185 | { | |
1186 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1187 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1188 | } | |
1189 | return false; | |
1190 | } | |
1191 | ||
145feb17 MA |
1192 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1193 | { | |
1194 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1195 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1196 | } |
1197 | } | |
1198 | ||
f107639a MA |
1199 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1200 | { | |
1201 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1202 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1203 | } | |
1204 | return false; | |
1205 | } | |
1206 | ||
e97fc193 AL |
1207 | /* |
1208 | * Run consistency checks on an image | |
1209 | * | |
e076f338 | 1210 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1211 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1212 | * check are stored in res. |
e97fc193 | 1213 | */ |
e076f338 | 1214 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) |
e97fc193 AL |
1215 | { |
1216 | if (bs->drv->bdrv_check == NULL) { | |
1217 | return -ENOTSUP; | |
1218 | } | |
1219 | ||
e076f338 | 1220 | memset(res, 0, sizeof(*res)); |
9ac228e0 | 1221 | return bs->drv->bdrv_check(bs, res); |
e97fc193 AL |
1222 | } |
1223 | ||
8a426614 KW |
1224 | #define COMMIT_BUF_SECTORS 2048 |
1225 | ||
33e3963e FB |
1226 | /* commit COW file into the raw image */ |
1227 | int bdrv_commit(BlockDriverState *bs) | |
1228 | { | |
19cb3738 | 1229 | BlockDriver *drv = bs->drv; |
ee181196 | 1230 | BlockDriver *backing_drv; |
8a426614 KW |
1231 | int64_t sector, total_sectors; |
1232 | int n, ro, open_flags; | |
4dca4b63 | 1233 | int ret = 0, rw_ret = 0; |
8a426614 | 1234 | uint8_t *buf; |
4dca4b63 NS |
1235 | char filename[1024]; |
1236 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 1237 | |
19cb3738 FB |
1238 | if (!drv) |
1239 | return -ENOMEDIUM; | |
4dca4b63 NS |
1240 | |
1241 | if (!bs->backing_hd) { | |
1242 | return -ENOTSUP; | |
33e3963e FB |
1243 | } |
1244 | ||
4dca4b63 NS |
1245 | if (bs->backing_hd->keep_read_only) { |
1246 | return -EACCES; | |
1247 | } | |
ee181196 | 1248 | |
2d3735d3 SH |
1249 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1250 | return -EBUSY; | |
1251 | } | |
1252 | ||
ee181196 | 1253 | backing_drv = bs->backing_hd->drv; |
4dca4b63 NS |
1254 | ro = bs->backing_hd->read_only; |
1255 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
1256 | open_flags = bs->backing_hd->open_flags; | |
1257 | ||
1258 | if (ro) { | |
1259 | /* re-open as RW */ | |
1260 | bdrv_delete(bs->backing_hd); | |
1261 | bs->backing_hd = NULL; | |
1262 | bs_rw = bdrv_new(""); | |
ee181196 KW |
1263 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
1264 | backing_drv); | |
4dca4b63 NS |
1265 | if (rw_ret < 0) { |
1266 | bdrv_delete(bs_rw); | |
1267 | /* try to re-open read-only */ | |
1268 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1269 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1270 | backing_drv); | |
4dca4b63 NS |
1271 | if (ret < 0) { |
1272 | bdrv_delete(bs_ro); | |
1273 | /* drive not functional anymore */ | |
1274 | bs->drv = NULL; | |
1275 | return ret; | |
1276 | } | |
1277 | bs->backing_hd = bs_ro; | |
1278 | return rw_ret; | |
1279 | } | |
1280 | bs->backing_hd = bs_rw; | |
ea2384d3 | 1281 | } |
33e3963e | 1282 | |
6ea44308 | 1283 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1284 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1285 | |
1286 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1287 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1288 | |
1289 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1290 | ret = -EIO; | |
1291 | goto ro_cleanup; | |
1292 | } | |
1293 | ||
1294 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1295 | ret = -EIO; | |
1296 | goto ro_cleanup; | |
1297 | } | |
ea2384d3 | 1298 | } |
33e3963e | 1299 | } |
95389c86 | 1300 | |
1d44952f CH |
1301 | if (drv->bdrv_make_empty) { |
1302 | ret = drv->bdrv_make_empty(bs); | |
1303 | bdrv_flush(bs); | |
1304 | } | |
95389c86 | 1305 | |
3f5075ae CH |
1306 | /* |
1307 | * Make sure all data we wrote to the backing device is actually | |
1308 | * stable on disk. | |
1309 | */ | |
1310 | if (bs->backing_hd) | |
1311 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1312 | |
1313 | ro_cleanup: | |
7267c094 | 1314 | g_free(buf); |
4dca4b63 NS |
1315 | |
1316 | if (ro) { | |
1317 | /* re-open as RO */ | |
1318 | bdrv_delete(bs->backing_hd); | |
1319 | bs->backing_hd = NULL; | |
1320 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1321 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1322 | backing_drv); | |
4dca4b63 NS |
1323 | if (ret < 0) { |
1324 | bdrv_delete(bs_ro); | |
1325 | /* drive not functional anymore */ | |
1326 | bs->drv = NULL; | |
1327 | return ret; | |
1328 | } | |
1329 | bs->backing_hd = bs_ro; | |
1330 | bs->backing_hd->keep_read_only = 0; | |
1331 | } | |
1332 | ||
1d44952f | 1333 | return ret; |
33e3963e FB |
1334 | } |
1335 | ||
e8877497 | 1336 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1337 | { |
1338 | BlockDriverState *bs; | |
1339 | ||
1340 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
e8877497 SH |
1341 | int ret = bdrv_commit(bs); |
1342 | if (ret < 0) { | |
1343 | return ret; | |
1344 | } | |
6ab4b5ab | 1345 | } |
e8877497 | 1346 | return 0; |
6ab4b5ab MA |
1347 | } |
1348 | ||
dbffbdcf SH |
1349 | struct BdrvTrackedRequest { |
1350 | BlockDriverState *bs; | |
1351 | int64_t sector_num; | |
1352 | int nb_sectors; | |
1353 | bool is_write; | |
1354 | QLIST_ENTRY(BdrvTrackedRequest) list; | |
5f8b6491 | 1355 | Coroutine *co; /* owner, used for deadlock detection */ |
f4658285 | 1356 | CoQueue wait_queue; /* coroutines blocked on this request */ |
dbffbdcf SH |
1357 | }; |
1358 | ||
1359 | /** | |
1360 | * Remove an active request from the tracked requests list | |
1361 | * | |
1362 | * This function should be called when a tracked request is completing. | |
1363 | */ | |
1364 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1365 | { | |
1366 | QLIST_REMOVE(req, list); | |
f4658285 | 1367 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1368 | } |
1369 | ||
1370 | /** | |
1371 | * Add an active request to the tracked requests list | |
1372 | */ | |
1373 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1374 | BlockDriverState *bs, | |
1375 | int64_t sector_num, | |
1376 | int nb_sectors, bool is_write) | |
1377 | { | |
1378 | *req = (BdrvTrackedRequest){ | |
1379 | .bs = bs, | |
1380 | .sector_num = sector_num, | |
1381 | .nb_sectors = nb_sectors, | |
1382 | .is_write = is_write, | |
5f8b6491 | 1383 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1384 | }; |
1385 | ||
f4658285 SH |
1386 | qemu_co_queue_init(&req->wait_queue); |
1387 | ||
dbffbdcf SH |
1388 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1389 | } | |
1390 | ||
d83947ac SH |
1391 | /** |
1392 | * Round a region to cluster boundaries | |
1393 | */ | |
1394 | static void round_to_clusters(BlockDriverState *bs, | |
1395 | int64_t sector_num, int nb_sectors, | |
1396 | int64_t *cluster_sector_num, | |
1397 | int *cluster_nb_sectors) | |
1398 | { | |
1399 | BlockDriverInfo bdi; | |
1400 | ||
1401 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1402 | *cluster_sector_num = sector_num; | |
1403 | *cluster_nb_sectors = nb_sectors; | |
1404 | } else { | |
1405 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1406 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1407 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1408 | nb_sectors, c); | |
1409 | } | |
1410 | } | |
1411 | ||
f4658285 SH |
1412 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1413 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1414 | /* aaaa bbbb */ |
1415 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1416 | return false; | |
1417 | } | |
1418 | /* bbbb aaaa */ | |
1419 | if (req->sector_num >= sector_num + nb_sectors) { | |
1420 | return false; | |
1421 | } | |
1422 | return true; | |
f4658285 SH |
1423 | } |
1424 | ||
1425 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1426 | int64_t sector_num, int nb_sectors) | |
1427 | { | |
1428 | BdrvTrackedRequest *req; | |
d83947ac SH |
1429 | int64_t cluster_sector_num; |
1430 | int cluster_nb_sectors; | |
f4658285 SH |
1431 | bool retry; |
1432 | ||
d83947ac SH |
1433 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1434 | * that allocating writes will be serialized and not race with each other | |
1435 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1436 | * CoR read and write operations are atomic and guest writes cannot | |
1437 | * interleave between them. | |
1438 | */ | |
1439 | round_to_clusters(bs, sector_num, nb_sectors, | |
1440 | &cluster_sector_num, &cluster_nb_sectors); | |
1441 | ||
f4658285 SH |
1442 | do { |
1443 | retry = false; | |
1444 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1445 | if (tracked_request_overlaps(req, cluster_sector_num, |
1446 | cluster_nb_sectors)) { | |
5f8b6491 SH |
1447 | /* Hitting this means there was a reentrant request, for |
1448 | * example, a block driver issuing nested requests. This must | |
1449 | * never happen since it means deadlock. | |
1450 | */ | |
1451 | assert(qemu_coroutine_self() != req->co); | |
1452 | ||
f4658285 SH |
1453 | qemu_co_queue_wait(&req->wait_queue); |
1454 | retry = true; | |
1455 | break; | |
1456 | } | |
1457 | } | |
1458 | } while (retry); | |
1459 | } | |
1460 | ||
756e6736 KW |
1461 | /* |
1462 | * Return values: | |
1463 | * 0 - success | |
1464 | * -EINVAL - backing format specified, but no file | |
1465 | * -ENOSPC - can't update the backing file because no space is left in the | |
1466 | * image file header | |
1467 | * -ENOTSUP - format driver doesn't support changing the backing file | |
1468 | */ | |
1469 | int bdrv_change_backing_file(BlockDriverState *bs, | |
1470 | const char *backing_file, const char *backing_fmt) | |
1471 | { | |
1472 | BlockDriver *drv = bs->drv; | |
469ef350 | 1473 | int ret; |
756e6736 | 1474 | |
5f377794 PB |
1475 | /* Backing file format doesn't make sense without a backing file */ |
1476 | if (backing_fmt && !backing_file) { | |
1477 | return -EINVAL; | |
1478 | } | |
1479 | ||
756e6736 | 1480 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 1481 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 1482 | } else { |
469ef350 | 1483 | ret = -ENOTSUP; |
756e6736 | 1484 | } |
469ef350 PB |
1485 | |
1486 | if (ret == 0) { | |
1487 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
1488 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1489 | } | |
1490 | return ret; | |
756e6736 KW |
1491 | } |
1492 | ||
71d0770c AL |
1493 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1494 | size_t size) | |
1495 | { | |
1496 | int64_t len; | |
1497 | ||
1498 | if (!bdrv_is_inserted(bs)) | |
1499 | return -ENOMEDIUM; | |
1500 | ||
1501 | if (bs->growable) | |
1502 | return 0; | |
1503 | ||
1504 | len = bdrv_getlength(bs); | |
1505 | ||
fbb7b4e0 KW |
1506 | if (offset < 0) |
1507 | return -EIO; | |
1508 | ||
1509 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
1510 | return -EIO; |
1511 | ||
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
1516 | int nb_sectors) | |
1517 | { | |
eb5a3165 JS |
1518 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
1519 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
1520 | } |
1521 | ||
1c9805a3 SH |
1522 | typedef struct RwCo { |
1523 | BlockDriverState *bs; | |
1524 | int64_t sector_num; | |
1525 | int nb_sectors; | |
1526 | QEMUIOVector *qiov; | |
1527 | bool is_write; | |
1528 | int ret; | |
1529 | } RwCo; | |
1530 | ||
1531 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 1532 | { |
1c9805a3 | 1533 | RwCo *rwco = opaque; |
ea2384d3 | 1534 | |
1c9805a3 SH |
1535 | if (!rwco->is_write) { |
1536 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
470c0504 | 1537 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1538 | } else { |
1539 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
f08f2dda | 1540 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1541 | } |
1542 | } | |
e7a8a783 | 1543 | |
1c9805a3 SH |
1544 | /* |
1545 | * Process a synchronous request using coroutines | |
1546 | */ | |
1547 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
1548 | int nb_sectors, bool is_write) | |
1549 | { | |
1550 | QEMUIOVector qiov; | |
1551 | struct iovec iov = { | |
1552 | .iov_base = (void *)buf, | |
1553 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1554 | }; | |
1555 | Coroutine *co; | |
1556 | RwCo rwco = { | |
1557 | .bs = bs, | |
1558 | .sector_num = sector_num, | |
1559 | .nb_sectors = nb_sectors, | |
1560 | .qiov = &qiov, | |
1561 | .is_write = is_write, | |
1562 | .ret = NOT_DONE, | |
1563 | }; | |
e7a8a783 | 1564 | |
1c9805a3 | 1565 | qemu_iovec_init_external(&qiov, &iov, 1); |
e7a8a783 | 1566 | |
498e386c ZYW |
1567 | /** |
1568 | * In sync call context, when the vcpu is blocked, this throttling timer | |
1569 | * will not fire; so the I/O throttling function has to be disabled here | |
1570 | * if it has been enabled. | |
1571 | */ | |
1572 | if (bs->io_limits_enabled) { | |
1573 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
1574 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
1575 | bdrv_io_limits_disable(bs); | |
1576 | } | |
1577 | ||
1c9805a3 SH |
1578 | if (qemu_in_coroutine()) { |
1579 | /* Fast-path if already in coroutine context */ | |
1580 | bdrv_rw_co_entry(&rwco); | |
1581 | } else { | |
1582 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
1583 | qemu_coroutine_enter(co, &rwco); | |
1584 | while (rwco.ret == NOT_DONE) { | |
1585 | qemu_aio_wait(); | |
1586 | } | |
1587 | } | |
1588 | return rwco.ret; | |
1589 | } | |
b338082b | 1590 | |
1c9805a3 SH |
1591 | /* return < 0 if error. See bdrv_write() for the return codes */ |
1592 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
1593 | uint8_t *buf, int nb_sectors) | |
1594 | { | |
1595 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
fc01f7e7 FB |
1596 | } |
1597 | ||
71df14fc PB |
1598 | #define BITS_PER_LONG (sizeof(unsigned long) * 8) |
1599 | ||
7cd1e32a | 1600 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 1601 | int nb_sectors, int dirty) |
7cd1e32a LS |
1602 | { |
1603 | int64_t start, end; | |
c6d22830 | 1604 | unsigned long val, idx, bit; |
a55eb92c | 1605 | |
6ea44308 | 1606 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 1607 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
1608 | |
1609 | for (; start <= end; start++) { | |
71df14fc PB |
1610 | idx = start / BITS_PER_LONG; |
1611 | bit = start % BITS_PER_LONG; | |
c6d22830 JK |
1612 | val = bs->dirty_bitmap[idx]; |
1613 | if (dirty) { | |
6d59fec1 | 1614 | if (!(val & (1UL << bit))) { |
aaa0eb75 | 1615 | bs->dirty_count++; |
6d59fec1 | 1616 | val |= 1UL << bit; |
aaa0eb75 | 1617 | } |
c6d22830 | 1618 | } else { |
6d59fec1 | 1619 | if (val & (1UL << bit)) { |
aaa0eb75 | 1620 | bs->dirty_count--; |
6d59fec1 | 1621 | val &= ~(1UL << bit); |
aaa0eb75 | 1622 | } |
c6d22830 JK |
1623 | } |
1624 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a LS |
1625 | } |
1626 | } | |
1627 | ||
5fafdf24 | 1628 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
1629 | -EIO generic I/O error (may happen for all errors) |
1630 | -ENOMEDIUM No media inserted. | |
1631 | -EINVAL Invalid sector number or nb_sectors | |
1632 | -EACCES Trying to write a read-only device | |
1633 | */ | |
5fafdf24 | 1634 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
1635 | const uint8_t *buf, int nb_sectors) |
1636 | { | |
1c9805a3 | 1637 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
83f64091 FB |
1638 | } |
1639 | ||
eda578e5 AL |
1640 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
1641 | void *buf, int count1) | |
83f64091 | 1642 | { |
6ea44308 | 1643 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1644 | int len, nb_sectors, count; |
1645 | int64_t sector_num; | |
9a8c4cce | 1646 | int ret; |
83f64091 FB |
1647 | |
1648 | count = count1; | |
1649 | /* first read to align to sector start */ | |
6ea44308 | 1650 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1651 | if (len > count) |
1652 | len = count; | |
6ea44308 | 1653 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1654 | if (len > 0) { |
9a8c4cce KW |
1655 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1656 | return ret; | |
6ea44308 | 1657 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
1658 | count -= len; |
1659 | if (count == 0) | |
1660 | return count1; | |
1661 | sector_num++; | |
1662 | buf += len; | |
1663 | } | |
1664 | ||
1665 | /* read the sectors "in place" */ | |
6ea44308 | 1666 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1667 | if (nb_sectors > 0) { |
9a8c4cce KW |
1668 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1669 | return ret; | |
83f64091 | 1670 | sector_num += nb_sectors; |
6ea44308 | 1671 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1672 | buf += len; |
1673 | count -= len; | |
1674 | } | |
1675 | ||
1676 | /* add data from the last sector */ | |
1677 | if (count > 0) { | |
9a8c4cce KW |
1678 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1679 | return ret; | |
83f64091 FB |
1680 | memcpy(buf, tmp_buf, count); |
1681 | } | |
1682 | return count1; | |
1683 | } | |
1684 | ||
eda578e5 AL |
1685 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
1686 | const void *buf, int count1) | |
83f64091 | 1687 | { |
6ea44308 | 1688 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1689 | int len, nb_sectors, count; |
1690 | int64_t sector_num; | |
9a8c4cce | 1691 | int ret; |
83f64091 FB |
1692 | |
1693 | count = count1; | |
1694 | /* first write to align to sector start */ | |
6ea44308 | 1695 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1696 | if (len > count) |
1697 | len = count; | |
6ea44308 | 1698 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1699 | if (len > 0) { |
9a8c4cce KW |
1700 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1701 | return ret; | |
6ea44308 | 1702 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1703 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1704 | return ret; | |
83f64091 FB |
1705 | count -= len; |
1706 | if (count == 0) | |
1707 | return count1; | |
1708 | sector_num++; | |
1709 | buf += len; | |
1710 | } | |
1711 | ||
1712 | /* write the sectors "in place" */ | |
6ea44308 | 1713 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1714 | if (nb_sectors > 0) { |
9a8c4cce KW |
1715 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1716 | return ret; | |
83f64091 | 1717 | sector_num += nb_sectors; |
6ea44308 | 1718 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1719 | buf += len; |
1720 | count -= len; | |
1721 | } | |
1722 | ||
1723 | /* add data from the last sector */ | |
1724 | if (count > 0) { | |
9a8c4cce KW |
1725 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1726 | return ret; | |
83f64091 | 1727 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1728 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1729 | return ret; | |
83f64091 FB |
1730 | } |
1731 | return count1; | |
1732 | } | |
83f64091 | 1733 | |
f08145fe KW |
1734 | /* |
1735 | * Writes to the file and ensures that no writes are reordered across this | |
1736 | * request (acts as a barrier) | |
1737 | * | |
1738 | * Returns 0 on success, -errno in error cases. | |
1739 | */ | |
1740 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1741 | const void *buf, int count) | |
1742 | { | |
1743 | int ret; | |
1744 | ||
1745 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1746 | if (ret < 0) { | |
1747 | return ret; | |
1748 | } | |
1749 | ||
92196b2f SH |
1750 | /* No flush needed for cache modes that use O_DSYNC */ |
1751 | if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { | |
f08145fe KW |
1752 | bdrv_flush(bs); |
1753 | } | |
1754 | ||
1755 | return 0; | |
1756 | } | |
1757 | ||
470c0504 | 1758 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
1759 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
1760 | { | |
1761 | /* Perform I/O through a temporary buffer so that users who scribble over | |
1762 | * their read buffer while the operation is in progress do not end up | |
1763 | * modifying the image file. This is critical for zero-copy guest I/O | |
1764 | * where anything might happen inside guest memory. | |
1765 | */ | |
1766 | void *bounce_buffer; | |
1767 | ||
79c053bd | 1768 | BlockDriver *drv = bs->drv; |
ab185921 SH |
1769 | struct iovec iov; |
1770 | QEMUIOVector bounce_qiov; | |
1771 | int64_t cluster_sector_num; | |
1772 | int cluster_nb_sectors; | |
1773 | size_t skip_bytes; | |
1774 | int ret; | |
1775 | ||
1776 | /* Cover entire cluster so no additional backing file I/O is required when | |
1777 | * allocating cluster in the image file. | |
1778 | */ | |
1779 | round_to_clusters(bs, sector_num, nb_sectors, | |
1780 | &cluster_sector_num, &cluster_nb_sectors); | |
1781 | ||
470c0504 SH |
1782 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
1783 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
1784 | |
1785 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
1786 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
1787 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
1788 | ||
79c053bd SH |
1789 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
1790 | &bounce_qiov); | |
ab185921 SH |
1791 | if (ret < 0) { |
1792 | goto err; | |
1793 | } | |
1794 | ||
79c053bd SH |
1795 | if (drv->bdrv_co_write_zeroes && |
1796 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
1797 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
1798 | cluster_nb_sectors); | |
79c053bd SH |
1799 | } else { |
1800 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, | |
ab185921 | 1801 | &bounce_qiov); |
79c053bd SH |
1802 | } |
1803 | ||
ab185921 SH |
1804 | if (ret < 0) { |
1805 | /* It might be okay to ignore write errors for guest requests. If this | |
1806 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
1807 | * Simply report it in all cases. | |
1808 | */ | |
1809 | goto err; | |
1810 | } | |
1811 | ||
1812 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
1813 | qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, | |
1814 | nb_sectors * BDRV_SECTOR_SIZE); | |
1815 | ||
1816 | err: | |
1817 | qemu_vfree(bounce_buffer); | |
1818 | return ret; | |
1819 | } | |
1820 | ||
c5fbe571 SH |
1821 | /* |
1822 | * Handle a read request in coroutine context | |
1823 | */ | |
1824 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
1825 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
1826 | BdrvRequestFlags flags) | |
da1fa91d KW |
1827 | { |
1828 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
1829 | BdrvTrackedRequest req; |
1830 | int ret; | |
da1fa91d | 1831 | |
da1fa91d KW |
1832 | if (!drv) { |
1833 | return -ENOMEDIUM; | |
1834 | } | |
1835 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1836 | return -EIO; | |
1837 | } | |
1838 | ||
98f90dba ZYW |
1839 | /* throttling disk read I/O */ |
1840 | if (bs->io_limits_enabled) { | |
1841 | bdrv_io_limits_intercept(bs, false, nb_sectors); | |
1842 | } | |
1843 | ||
f4658285 | 1844 | if (bs->copy_on_read) { |
470c0504 SH |
1845 | flags |= BDRV_REQ_COPY_ON_READ; |
1846 | } | |
1847 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1848 | bs->copy_on_read_in_flight++; | |
1849 | } | |
1850 | ||
1851 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
1852 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1853 | } | |
1854 | ||
dbffbdcf | 1855 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 1856 | |
470c0504 | 1857 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
1858 | int pnum; |
1859 | ||
1860 | ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); | |
1861 | if (ret < 0) { | |
1862 | goto out; | |
1863 | } | |
1864 | ||
1865 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 1866 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1867 | goto out; |
1868 | } | |
1869 | } | |
1870 | ||
dbffbdcf | 1871 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1872 | |
1873 | out: | |
dbffbdcf | 1874 | tracked_request_end(&req); |
470c0504 SH |
1875 | |
1876 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1877 | bs->copy_on_read_in_flight--; | |
1878 | } | |
1879 | ||
dbffbdcf | 1880 | return ret; |
da1fa91d KW |
1881 | } |
1882 | ||
c5fbe571 | 1883 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
1884 | int nb_sectors, QEMUIOVector *qiov) |
1885 | { | |
c5fbe571 | 1886 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 1887 | |
470c0504 SH |
1888 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
1889 | } | |
1890 | ||
1891 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
1892 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1893 | { | |
1894 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
1895 | ||
1896 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
1897 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
1898 | } |
1899 | ||
f08f2dda SH |
1900 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
1901 | int64_t sector_num, int nb_sectors) | |
1902 | { | |
1903 | BlockDriver *drv = bs->drv; | |
1904 | QEMUIOVector qiov; | |
1905 | struct iovec iov; | |
1906 | int ret; | |
1907 | ||
621f0589 KW |
1908 | /* TODO Emulate only part of misaligned requests instead of letting block |
1909 | * drivers return -ENOTSUP and emulate everything */ | |
1910 | ||
f08f2dda SH |
1911 | /* First try the efficient write zeroes operation */ |
1912 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
1913 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
1914 | if (ret != -ENOTSUP) { | |
1915 | return ret; | |
1916 | } | |
f08f2dda SH |
1917 | } |
1918 | ||
1919 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
1920 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
1921 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
1922 | memset(iov.iov_base, 0, iov.iov_len); | |
1923 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1924 | ||
1925 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
1926 | ||
1927 | qemu_vfree(iov.iov_base); | |
1928 | return ret; | |
1929 | } | |
1930 | ||
c5fbe571 SH |
1931 | /* |
1932 | * Handle a write request in coroutine context | |
1933 | */ | |
1934 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
1935 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
1936 | BdrvRequestFlags flags) | |
c5fbe571 SH |
1937 | { |
1938 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 1939 | BdrvTrackedRequest req; |
6b7cb247 | 1940 | int ret; |
da1fa91d KW |
1941 | |
1942 | if (!bs->drv) { | |
1943 | return -ENOMEDIUM; | |
1944 | } | |
1945 | if (bs->read_only) { | |
1946 | return -EACCES; | |
1947 | } | |
1948 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1949 | return -EIO; | |
1950 | } | |
1951 | ||
98f90dba ZYW |
1952 | /* throttling disk write I/O */ |
1953 | if (bs->io_limits_enabled) { | |
1954 | bdrv_io_limits_intercept(bs, true, nb_sectors); | |
1955 | } | |
1956 | ||
470c0504 | 1957 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
1958 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1959 | } | |
1960 | ||
dbffbdcf SH |
1961 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
1962 | ||
f08f2dda SH |
1963 | if (flags & BDRV_REQ_ZERO_WRITE) { |
1964 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); | |
1965 | } else { | |
1966 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
1967 | } | |
6b7cb247 | 1968 | |
da1fa91d KW |
1969 | if (bs->dirty_bitmap) { |
1970 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1971 | } | |
1972 | ||
1973 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1974 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1975 | } | |
1976 | ||
dbffbdcf SH |
1977 | tracked_request_end(&req); |
1978 | ||
6b7cb247 | 1979 | return ret; |
da1fa91d KW |
1980 | } |
1981 | ||
c5fbe571 SH |
1982 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
1983 | int nb_sectors, QEMUIOVector *qiov) | |
1984 | { | |
1985 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
1986 | ||
f08f2dda SH |
1987 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
1988 | } | |
1989 | ||
1990 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
1991 | int64_t sector_num, int nb_sectors) | |
1992 | { | |
1993 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
1994 | ||
1995 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
1996 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
1997 | } |
1998 | ||
83f64091 FB |
1999 | /** |
2000 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2001 | */ | |
2002 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2003 | { | |
2004 | BlockDriver *drv = bs->drv; | |
51762288 | 2005 | int ret; |
83f64091 | 2006 | if (!drv) |
19cb3738 | 2007 | return -ENOMEDIUM; |
83f64091 FB |
2008 | if (!drv->bdrv_truncate) |
2009 | return -ENOTSUP; | |
59f2689d NS |
2010 | if (bs->read_only) |
2011 | return -EACCES; | |
8591675f MT |
2012 | if (bdrv_in_use(bs)) |
2013 | return -EBUSY; | |
51762288 SH |
2014 | ret = drv->bdrv_truncate(bs, offset); |
2015 | if (ret == 0) { | |
2016 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2017 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2018 | } |
2019 | return ret; | |
83f64091 FB |
2020 | } |
2021 | ||
4a1d5e1f FZ |
2022 | /** |
2023 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2024 | * allocated space. Return < 0 if error or unknown. | |
2025 | */ | |
2026 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2027 | { | |
2028 | BlockDriver *drv = bs->drv; | |
2029 | if (!drv) { | |
2030 | return -ENOMEDIUM; | |
2031 | } | |
2032 | if (drv->bdrv_get_allocated_file_size) { | |
2033 | return drv->bdrv_get_allocated_file_size(bs); | |
2034 | } | |
2035 | if (bs->file) { | |
2036 | return bdrv_get_allocated_file_size(bs->file); | |
2037 | } | |
2038 | return -ENOTSUP; | |
2039 | } | |
2040 | ||
83f64091 FB |
2041 | /** |
2042 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2043 | */ | |
2044 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2045 | { | |
2046 | BlockDriver *drv = bs->drv; | |
2047 | if (!drv) | |
19cb3738 | 2048 | return -ENOMEDIUM; |
51762288 | 2049 | |
2c6942fa | 2050 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2051 | if (drv->bdrv_getlength) { |
2052 | return drv->bdrv_getlength(bs); | |
2053 | } | |
83f64091 | 2054 | } |
46a4e4e6 | 2055 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2056 | } |
2057 | ||
19cb3738 | 2058 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2059 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2060 | { |
19cb3738 FB |
2061 | int64_t length; |
2062 | length = bdrv_getlength(bs); | |
2063 | if (length < 0) | |
2064 | length = 0; | |
2065 | else | |
6ea44308 | 2066 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2067 | *nb_sectors_ptr = length; |
fc01f7e7 | 2068 | } |
cf98951b | 2069 | |
f3d54fc4 AL |
2070 | struct partition { |
2071 | uint8_t boot_ind; /* 0x80 - active */ | |
2072 | uint8_t head; /* starting head */ | |
2073 | uint8_t sector; /* starting sector */ | |
2074 | uint8_t cyl; /* starting cylinder */ | |
2075 | uint8_t sys_ind; /* What partition type */ | |
2076 | uint8_t end_head; /* end head */ | |
2077 | uint8_t end_sector; /* end sector */ | |
2078 | uint8_t end_cyl; /* end cylinder */ | |
2079 | uint32_t start_sect; /* starting sector counting from 0 */ | |
2080 | uint32_t nr_sects; /* nr of sectors in partition */ | |
541dc0d4 | 2081 | } QEMU_PACKED; |
f3d54fc4 AL |
2082 | |
2083 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
2084 | static int guess_disk_lchs(BlockDriverState *bs, | |
2085 | int *pcylinders, int *pheads, int *psectors) | |
2086 | { | |
eb5a3165 | 2087 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
2088 | int ret, i, heads, sectors, cylinders; |
2089 | struct partition *p; | |
2090 | uint32_t nr_sects; | |
a38131b6 | 2091 | uint64_t nb_sectors; |
498e386c | 2092 | bool enabled; |
f3d54fc4 AL |
2093 | |
2094 | bdrv_get_geometry(bs, &nb_sectors); | |
2095 | ||
498e386c ZYW |
2096 | /** |
2097 | * The function will be invoked during startup not only in sync I/O mode, | |
2098 | * but also in async I/O mode. So the I/O throttling function has to | |
2099 | * be disabled temporarily here, not permanently. | |
2100 | */ | |
2101 | enabled = bs->io_limits_enabled; | |
2102 | bs->io_limits_enabled = false; | |
f3d54fc4 | 2103 | ret = bdrv_read(bs, 0, buf, 1); |
498e386c | 2104 | bs->io_limits_enabled = enabled; |
f3d54fc4 AL |
2105 | if (ret < 0) |
2106 | return -1; | |
2107 | /* test msdos magic */ | |
2108 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
2109 | return -1; | |
2110 | for(i = 0; i < 4; i++) { | |
2111 | p = ((struct partition *)(buf + 0x1be)) + i; | |
2112 | nr_sects = le32_to_cpu(p->nr_sects); | |
2113 | if (nr_sects && p->end_head) { | |
2114 | /* We make the assumption that the partition terminates on | |
2115 | a cylinder boundary */ | |
2116 | heads = p->end_head + 1; | |
2117 | sectors = p->end_sector & 63; | |
2118 | if (sectors == 0) | |
2119 | continue; | |
2120 | cylinders = nb_sectors / (heads * sectors); | |
2121 | if (cylinders < 1 || cylinders > 16383) | |
2122 | continue; | |
2123 | *pheads = heads; | |
2124 | *psectors = sectors; | |
2125 | *pcylinders = cylinders; | |
2126 | #if 0 | |
2127 | printf("guessed geometry: LCHS=%d %d %d\n", | |
2128 | cylinders, heads, sectors); | |
2129 | #endif | |
2130 | return 0; | |
2131 | } | |
2132 | } | |
2133 | return -1; | |
2134 | } | |
2135 | ||
2136 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
2137 | { | |
2138 | int translation, lba_detected = 0; | |
2139 | int cylinders, heads, secs; | |
a38131b6 | 2140 | uint64_t nb_sectors; |
f3d54fc4 AL |
2141 | |
2142 | /* if a geometry hint is available, use it */ | |
2143 | bdrv_get_geometry(bs, &nb_sectors); | |
2144 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
2145 | translation = bdrv_get_translation_hint(bs); | |
2146 | if (cylinders != 0) { | |
2147 | *pcyls = cylinders; | |
2148 | *pheads = heads; | |
2149 | *psecs = secs; | |
2150 | } else { | |
2151 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
2152 | if (heads > 16) { | |
2153 | /* if heads > 16, it means that a BIOS LBA | |
2154 | translation was active, so the default | |
2155 | hardware geometry is OK */ | |
2156 | lba_detected = 1; | |
2157 | goto default_geometry; | |
2158 | } else { | |
2159 | *pcyls = cylinders; | |
2160 | *pheads = heads; | |
2161 | *psecs = secs; | |
2162 | /* disable any translation to be in sync with | |
2163 | the logical geometry */ | |
2164 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
2165 | bdrv_set_translation_hint(bs, | |
2166 | BIOS_ATA_TRANSLATION_NONE); | |
2167 | } | |
2168 | } | |
2169 | } else { | |
2170 | default_geometry: | |
2171 | /* if no geometry, use a standard physical disk geometry */ | |
2172 | cylinders = nb_sectors / (16 * 63); | |
2173 | ||
2174 | if (cylinders > 16383) | |
2175 | cylinders = 16383; | |
2176 | else if (cylinders < 2) | |
2177 | cylinders = 2; | |
2178 | *pcyls = cylinders; | |
2179 | *pheads = 16; | |
2180 | *psecs = 63; | |
2181 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
2182 | if ((*pcyls * *pheads) <= 131072) { | |
2183 | bdrv_set_translation_hint(bs, | |
2184 | BIOS_ATA_TRANSLATION_LARGE); | |
2185 | } else { | |
2186 | bdrv_set_translation_hint(bs, | |
2187 | BIOS_ATA_TRANSLATION_LBA); | |
2188 | } | |
2189 | } | |
2190 | } | |
2191 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
2192 | } | |
2193 | } | |
2194 | ||
5fafdf24 | 2195 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
2196 | int cyls, int heads, int secs) |
2197 | { | |
2198 | bs->cyls = cyls; | |
2199 | bs->heads = heads; | |
2200 | bs->secs = secs; | |
2201 | } | |
2202 | ||
46d4767d FB |
2203 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
2204 | { | |
2205 | bs->translation = translation; | |
2206 | } | |
2207 | ||
5fafdf24 | 2208 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
2209 | int *pcyls, int *pheads, int *psecs) |
2210 | { | |
2211 | *pcyls = bs->cyls; | |
2212 | *pheads = bs->heads; | |
2213 | *psecs = bs->secs; | |
2214 | } | |
2215 | ||
0563e191 ZYW |
2216 | /* throttling disk io limits */ |
2217 | void bdrv_set_io_limits(BlockDriverState *bs, | |
2218 | BlockIOLimit *io_limits) | |
2219 | { | |
2220 | bs->io_limits = *io_limits; | |
2221 | bs->io_limits_enabled = bdrv_io_limits_enabled(bs); | |
2222 | } | |
2223 | ||
5bbdbb46 BS |
2224 | /* Recognize floppy formats */ |
2225 | typedef struct FDFormat { | |
2226 | FDriveType drive; | |
2227 | uint8_t last_sect; | |
2228 | uint8_t max_track; | |
2229 | uint8_t max_head; | |
f8d3d128 | 2230 | FDriveRate rate; |
5bbdbb46 BS |
2231 | } FDFormat; |
2232 | ||
2233 | static const FDFormat fd_formats[] = { | |
2234 | /* First entry is default format */ | |
2235 | /* 1.44 MB 3"1/2 floppy disks */ | |
f8d3d128 HP |
2236 | { FDRIVE_DRV_144, 18, 80, 1, FDRIVE_RATE_500K, }, |
2237 | { FDRIVE_DRV_144, 20, 80, 1, FDRIVE_RATE_500K, }, | |
2238 | { FDRIVE_DRV_144, 21, 80, 1, FDRIVE_RATE_500K, }, | |
2239 | { FDRIVE_DRV_144, 21, 82, 1, FDRIVE_RATE_500K, }, | |
2240 | { FDRIVE_DRV_144, 21, 83, 1, FDRIVE_RATE_500K, }, | |
2241 | { FDRIVE_DRV_144, 22, 80, 1, FDRIVE_RATE_500K, }, | |
2242 | { FDRIVE_DRV_144, 23, 80, 1, FDRIVE_RATE_500K, }, | |
2243 | { FDRIVE_DRV_144, 24, 80, 1, FDRIVE_RATE_500K, }, | |
5bbdbb46 | 2244 | /* 2.88 MB 3"1/2 floppy disks */ |
f8d3d128 HP |
2245 | { FDRIVE_DRV_288, 36, 80, 1, FDRIVE_RATE_1M, }, |
2246 | { FDRIVE_DRV_288, 39, 80, 1, FDRIVE_RATE_1M, }, | |
2247 | { FDRIVE_DRV_288, 40, 80, 1, FDRIVE_RATE_1M, }, | |
2248 | { FDRIVE_DRV_288, 44, 80, 1, FDRIVE_RATE_1M, }, | |
2249 | { FDRIVE_DRV_288, 48, 80, 1, FDRIVE_RATE_1M, }, | |
5bbdbb46 | 2250 | /* 720 kB 3"1/2 floppy disks */ |
f8d3d128 HP |
2251 | { FDRIVE_DRV_144, 9, 80, 1, FDRIVE_RATE_250K, }, |
2252 | { FDRIVE_DRV_144, 10, 80, 1, FDRIVE_RATE_250K, }, | |
2253 | { FDRIVE_DRV_144, 10, 82, 1, FDRIVE_RATE_250K, }, | |
2254 | { FDRIVE_DRV_144, 10, 83, 1, FDRIVE_RATE_250K, }, | |
2255 | { FDRIVE_DRV_144, 13, 80, 1, FDRIVE_RATE_250K, }, | |
2256 | { FDRIVE_DRV_144, 14, 80, 1, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2257 | /* 1.2 MB 5"1/4 floppy disks */ |
f8d3d128 HP |
2258 | { FDRIVE_DRV_120, 15, 80, 1, FDRIVE_RATE_500K, }, |
2259 | { FDRIVE_DRV_120, 18, 80, 1, FDRIVE_RATE_500K, }, | |
2260 | { FDRIVE_DRV_120, 18, 82, 1, FDRIVE_RATE_500K, }, | |
2261 | { FDRIVE_DRV_120, 18, 83, 1, FDRIVE_RATE_500K, }, | |
2262 | { FDRIVE_DRV_120, 20, 80, 1, FDRIVE_RATE_500K, }, | |
5bbdbb46 | 2263 | /* 720 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2264 | { FDRIVE_DRV_120, 9, 80, 1, FDRIVE_RATE_250K, }, |
2265 | { FDRIVE_DRV_120, 11, 80, 1, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2266 | /* 360 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2267 | { FDRIVE_DRV_120, 9, 40, 1, FDRIVE_RATE_300K, }, |
2268 | { FDRIVE_DRV_120, 9, 40, 0, FDRIVE_RATE_300K, }, | |
2269 | { FDRIVE_DRV_120, 10, 41, 1, FDRIVE_RATE_300K, }, | |
2270 | { FDRIVE_DRV_120, 10, 42, 1, FDRIVE_RATE_300K, }, | |
5bbdbb46 | 2271 | /* 320 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2272 | { FDRIVE_DRV_120, 8, 40, 1, FDRIVE_RATE_250K, }, |
2273 | { FDRIVE_DRV_120, 8, 40, 0, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2274 | /* 360 kB must match 5"1/4 better than 3"1/2... */ |
f8d3d128 | 2275 | { FDRIVE_DRV_144, 9, 80, 0, FDRIVE_RATE_250K, }, |
5bbdbb46 | 2276 | /* end */ |
f8d3d128 | 2277 | { FDRIVE_DRV_NONE, -1, -1, 0, 0, }, |
5bbdbb46 BS |
2278 | }; |
2279 | ||
2280 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
2281 | int *max_track, int *last_sect, | |
f8d3d128 HP |
2282 | FDriveType drive_in, FDriveType *drive, |
2283 | FDriveRate *rate) | |
5bbdbb46 BS |
2284 | { |
2285 | const FDFormat *parse; | |
2286 | uint64_t nb_sectors, size; | |
2287 | int i, first_match, match; | |
2288 | ||
2289 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
2290 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
2291 | /* User defined disk */ | |
f8d3d128 | 2292 | *rate = FDRIVE_RATE_500K; |
5bbdbb46 BS |
2293 | } else { |
2294 | bdrv_get_geometry(bs, &nb_sectors); | |
2295 | match = -1; | |
2296 | first_match = -1; | |
2297 | for (i = 0; ; i++) { | |
2298 | parse = &fd_formats[i]; | |
2299 | if (parse->drive == FDRIVE_DRV_NONE) { | |
2300 | break; | |
2301 | } | |
2302 | if (drive_in == parse->drive || | |
2303 | drive_in == FDRIVE_DRV_NONE) { | |
2304 | size = (parse->max_head + 1) * parse->max_track * | |
2305 | parse->last_sect; | |
2306 | if (nb_sectors == size) { | |
2307 | match = i; | |
2308 | break; | |
2309 | } | |
2310 | if (first_match == -1) { | |
2311 | first_match = i; | |
2312 | } | |
2313 | } | |
2314 | } | |
2315 | if (match == -1) { | |
2316 | if (first_match == -1) { | |
2317 | match = 1; | |
2318 | } else { | |
2319 | match = first_match; | |
2320 | } | |
2321 | parse = &fd_formats[match]; | |
2322 | } | |
2323 | *nb_heads = parse->max_head + 1; | |
2324 | *max_track = parse->max_track; | |
2325 | *last_sect = parse->last_sect; | |
2326 | *drive = parse->drive; | |
f8d3d128 | 2327 | *rate = parse->rate; |
5bbdbb46 BS |
2328 | } |
2329 | } | |
2330 | ||
46d4767d FB |
2331 | int bdrv_get_translation_hint(BlockDriverState *bs) |
2332 | { | |
2333 | return bs->translation; | |
2334 | } | |
2335 | ||
abd7f68d MA |
2336 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
2337 | BlockErrorAction on_write_error) | |
2338 | { | |
2339 | bs->on_read_error = on_read_error; | |
2340 | bs->on_write_error = on_write_error; | |
2341 | } | |
2342 | ||
2343 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
2344 | { | |
2345 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2346 | } | |
2347 | ||
b338082b FB |
2348 | int bdrv_is_read_only(BlockDriverState *bs) |
2349 | { | |
2350 | return bs->read_only; | |
2351 | } | |
2352 | ||
985a03b0 TS |
2353 | int bdrv_is_sg(BlockDriverState *bs) |
2354 | { | |
2355 | return bs->sg; | |
2356 | } | |
2357 | ||
e900a7b7 CH |
2358 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2359 | { | |
2360 | return bs->enable_write_cache; | |
2361 | } | |
2362 | ||
ea2384d3 FB |
2363 | int bdrv_is_encrypted(BlockDriverState *bs) |
2364 | { | |
2365 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2366 | return 1; | |
2367 | return bs->encrypted; | |
2368 | } | |
2369 | ||
c0f4ce77 AL |
2370 | int bdrv_key_required(BlockDriverState *bs) |
2371 | { | |
2372 | BlockDriverState *backing_hd = bs->backing_hd; | |
2373 | ||
2374 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2375 | return 1; | |
2376 | return (bs->encrypted && !bs->valid_key); | |
2377 | } | |
2378 | ||
ea2384d3 FB |
2379 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2380 | { | |
2381 | int ret; | |
2382 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2383 | ret = bdrv_set_key(bs->backing_hd, key); | |
2384 | if (ret < 0) | |
2385 | return ret; | |
2386 | if (!bs->encrypted) | |
2387 | return 0; | |
2388 | } | |
fd04a2ae SH |
2389 | if (!bs->encrypted) { |
2390 | return -EINVAL; | |
2391 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2392 | return -ENOMEDIUM; | |
2393 | } | |
c0f4ce77 | 2394 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2395 | if (ret < 0) { |
2396 | bs->valid_key = 0; | |
2397 | } else if (!bs->valid_key) { | |
2398 | bs->valid_key = 1; | |
2399 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2400 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2401 | } |
c0f4ce77 | 2402 | return ret; |
ea2384d3 FB |
2403 | } |
2404 | ||
2405 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
2406 | { | |
19cb3738 | 2407 | if (!bs->drv) { |
ea2384d3 FB |
2408 | buf[0] = '\0'; |
2409 | } else { | |
2410 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
2411 | } | |
2412 | } | |
2413 | ||
5fafdf24 | 2414 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2415 | void *opaque) |
2416 | { | |
2417 | BlockDriver *drv; | |
2418 | ||
8a22f02a | 2419 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2420 | it(opaque, drv->format_name); |
2421 | } | |
2422 | } | |
2423 | ||
b338082b FB |
2424 | BlockDriverState *bdrv_find(const char *name) |
2425 | { | |
2426 | BlockDriverState *bs; | |
2427 | ||
1b7bdbc1 SH |
2428 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2429 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2430 | return bs; |
1b7bdbc1 | 2431 | } |
b338082b FB |
2432 | } |
2433 | return NULL; | |
2434 | } | |
2435 | ||
2f399b0a MA |
2436 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2437 | { | |
2438 | if (!bs) { | |
2439 | return QTAILQ_FIRST(&bdrv_states); | |
2440 | } | |
2441 | return QTAILQ_NEXT(bs, list); | |
2442 | } | |
2443 | ||
51de9760 | 2444 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2445 | { |
2446 | BlockDriverState *bs; | |
2447 | ||
1b7bdbc1 | 2448 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2449 | it(opaque, bs); |
81d0912d FB |
2450 | } |
2451 | } | |
2452 | ||
ea2384d3 FB |
2453 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2454 | { | |
2455 | return bs->device_name; | |
2456 | } | |
2457 | ||
c6ca28d6 AL |
2458 | void bdrv_flush_all(void) |
2459 | { | |
2460 | BlockDriverState *bs; | |
2461 | ||
1b7bdbc1 | 2462 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
29cdb251 | 2463 | bdrv_flush(bs); |
1b7bdbc1 | 2464 | } |
c6ca28d6 AL |
2465 | } |
2466 | ||
f2feebbd KW |
2467 | int bdrv_has_zero_init(BlockDriverState *bs) |
2468 | { | |
2469 | assert(bs->drv); | |
2470 | ||
336c1c12 KW |
2471 | if (bs->drv->bdrv_has_zero_init) { |
2472 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
2473 | } |
2474 | ||
2475 | return 1; | |
2476 | } | |
2477 | ||
376ae3f1 SH |
2478 | typedef struct BdrvCoIsAllocatedData { |
2479 | BlockDriverState *bs; | |
2480 | int64_t sector_num; | |
2481 | int nb_sectors; | |
2482 | int *pnum; | |
2483 | int ret; | |
2484 | bool done; | |
2485 | } BdrvCoIsAllocatedData; | |
2486 | ||
f58c7b35 TS |
2487 | /* |
2488 | * Returns true iff the specified sector is present in the disk image. Drivers | |
2489 | * not implementing the functionality are assumed to not support backing files, | |
2490 | * hence all their sectors are reported as allocated. | |
2491 | * | |
bd9533e3 SH |
2492 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
2493 | * and 'pnum' is set to 0. | |
2494 | * | |
f58c7b35 TS |
2495 | * 'pnum' is set to the number of sectors (including and immediately following |
2496 | * the specified sector) that are known to be in the same | |
2497 | * allocated/unallocated state. | |
2498 | * | |
bd9533e3 SH |
2499 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
2500 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 2501 | */ |
060f51c9 SH |
2502 | int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
2503 | int nb_sectors, int *pnum) | |
f58c7b35 | 2504 | { |
bd9533e3 SH |
2505 | int64_t n; |
2506 | ||
2507 | if (sector_num >= bs->total_sectors) { | |
2508 | *pnum = 0; | |
2509 | return 0; | |
2510 | } | |
2511 | ||
2512 | n = bs->total_sectors - sector_num; | |
2513 | if (n < nb_sectors) { | |
2514 | nb_sectors = n; | |
2515 | } | |
2516 | ||
6aebab14 | 2517 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 2518 | *pnum = nb_sectors; |
f58c7b35 TS |
2519 | return 1; |
2520 | } | |
6aebab14 | 2521 | |
060f51c9 SH |
2522 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
2523 | } | |
2524 | ||
2525 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
2526 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
2527 | { | |
2528 | BdrvCoIsAllocatedData *data = opaque; | |
2529 | BlockDriverState *bs = data->bs; | |
2530 | ||
2531 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
2532 | data->pnum); | |
2533 | data->done = true; | |
2534 | } | |
2535 | ||
2536 | /* | |
2537 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
2538 | * | |
2539 | * See bdrv_co_is_allocated() for details. | |
2540 | */ | |
2541 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
2542 | int *pnum) | |
2543 | { | |
6aebab14 SH |
2544 | Coroutine *co; |
2545 | BdrvCoIsAllocatedData data = { | |
2546 | .bs = bs, | |
2547 | .sector_num = sector_num, | |
2548 | .nb_sectors = nb_sectors, | |
2549 | .pnum = pnum, | |
2550 | .done = false, | |
2551 | }; | |
2552 | ||
2553 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
2554 | qemu_coroutine_enter(co, &data); | |
2555 | while (!data.done) { | |
2556 | qemu_aio_wait(); | |
2557 | } | |
2558 | return data.ret; | |
f58c7b35 TS |
2559 | } |
2560 | ||
b2023818 | 2561 | BlockInfoList *qmp_query_block(Error **errp) |
b338082b | 2562 | { |
b2023818 | 2563 | BlockInfoList *head = NULL, *cur_item = NULL; |
b338082b FB |
2564 | BlockDriverState *bs; |
2565 | ||
1b7bdbc1 | 2566 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
b2023818 | 2567 | BlockInfoList *info = g_malloc0(sizeof(*info)); |
d15e5465 | 2568 | |
b2023818 LC |
2569 | info->value = g_malloc0(sizeof(*info->value)); |
2570 | info->value->device = g_strdup(bs->device_name); | |
2571 | info->value->type = g_strdup("unknown"); | |
2572 | info->value->locked = bdrv_dev_is_medium_locked(bs); | |
2573 | info->value->removable = bdrv_dev_has_removable_media(bs); | |
d15e5465 | 2574 | |
e4def80b | 2575 | if (bdrv_dev_has_removable_media(bs)) { |
b2023818 LC |
2576 | info->value->has_tray_open = true; |
2577 | info->value->tray_open = bdrv_dev_is_tray_open(bs); | |
e4def80b | 2578 | } |
f04ef601 LC |
2579 | |
2580 | if (bdrv_iostatus_is_enabled(bs)) { | |
b2023818 LC |
2581 | info->value->has_io_status = true; |
2582 | info->value->io_status = bs->iostatus; | |
f04ef601 LC |
2583 | } |
2584 | ||
19cb3738 | 2585 | if (bs->drv) { |
b2023818 LC |
2586 | info->value->has_inserted = true; |
2587 | info->value->inserted = g_malloc0(sizeof(*info->value->inserted)); | |
2588 | info->value->inserted->file = g_strdup(bs->filename); | |
2589 | info->value->inserted->ro = bs->read_only; | |
2590 | info->value->inserted->drv = g_strdup(bs->drv->format_name); | |
2591 | info->value->inserted->encrypted = bs->encrypted; | |
2592 | if (bs->backing_file[0]) { | |
2593 | info->value->inserted->has_backing_file = true; | |
2594 | info->value->inserted->backing_file = g_strdup(bs->backing_file); | |
376253ec | 2595 | } |
727f005e ZYW |
2596 | |
2597 | if (bs->io_limits_enabled) { | |
2598 | info->value->inserted->bps = | |
2599 | bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
2600 | info->value->inserted->bps_rd = | |
2601 | bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; | |
2602 | info->value->inserted->bps_wr = | |
2603 | bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; | |
2604 | info->value->inserted->iops = | |
2605 | bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
2606 | info->value->inserted->iops_rd = | |
2607 | bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; | |
2608 | info->value->inserted->iops_wr = | |
2609 | bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; | |
2610 | } | |
b2023818 | 2611 | } |
d15e5465 | 2612 | |
b2023818 LC |
2613 | /* XXX: waiting for the qapi to support GSList */ |
2614 | if (!cur_item) { | |
2615 | head = cur_item = info; | |
2616 | } else { | |
2617 | cur_item->next = info; | |
2618 | cur_item = info; | |
b338082b | 2619 | } |
b338082b | 2620 | } |
d15e5465 | 2621 | |
b2023818 | 2622 | return head; |
b338082b | 2623 | } |
a36e69dd | 2624 | |
f11f57e4 LC |
2625 | /* Consider exposing this as a full fledged QMP command */ |
2626 | static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) | |
2627 | { | |
2628 | BlockStats *s; | |
2629 | ||
2630 | s = g_malloc0(sizeof(*s)); | |
2631 | ||
2632 | if (bs->device_name[0]) { | |
2633 | s->has_device = true; | |
2634 | s->device = g_strdup(bs->device_name); | |
294cc35f KW |
2635 | } |
2636 | ||
f11f57e4 LC |
2637 | s->stats = g_malloc0(sizeof(*s->stats)); |
2638 | s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; | |
2639 | s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; | |
2640 | s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; | |
2641 | s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; | |
2642 | s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; | |
2643 | s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; | |
2644 | s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; | |
2645 | s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; | |
2646 | s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; | |
2647 | ||
294cc35f | 2648 | if (bs->file) { |
f11f57e4 LC |
2649 | s->has_parent = true; |
2650 | s->parent = qmp_query_blockstat(bs->file, NULL); | |
294cc35f KW |
2651 | } |
2652 | ||
f11f57e4 | 2653 | return s; |
294cc35f KW |
2654 | } |
2655 | ||
f11f57e4 | 2656 | BlockStatsList *qmp_query_blockstats(Error **errp) |
218a536a | 2657 | { |
f11f57e4 | 2658 | BlockStatsList *head = NULL, *cur_item = NULL; |
a36e69dd TS |
2659 | BlockDriverState *bs; |
2660 | ||
1b7bdbc1 | 2661 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f11f57e4 LC |
2662 | BlockStatsList *info = g_malloc0(sizeof(*info)); |
2663 | info->value = qmp_query_blockstat(bs, NULL); | |
2664 | ||
2665 | /* XXX: waiting for the qapi to support GSList */ | |
2666 | if (!cur_item) { | |
2667 | head = cur_item = info; | |
2668 | } else { | |
2669 | cur_item->next = info; | |
2670 | cur_item = info; | |
2671 | } | |
a36e69dd | 2672 | } |
218a536a | 2673 | |
f11f57e4 | 2674 | return head; |
a36e69dd | 2675 | } |
ea2384d3 | 2676 | |
045df330 AL |
2677 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
2678 | { | |
2679 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2680 | return bs->backing_file; | |
2681 | else if (bs->encrypted) | |
2682 | return bs->filename; | |
2683 | else | |
2684 | return NULL; | |
2685 | } | |
2686 | ||
5fafdf24 | 2687 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
2688 | char *filename, int filename_size) |
2689 | { | |
3574c608 | 2690 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
2691 | } |
2692 | ||
5fafdf24 | 2693 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
2694 | const uint8_t *buf, int nb_sectors) |
2695 | { | |
2696 | BlockDriver *drv = bs->drv; | |
2697 | if (!drv) | |
19cb3738 | 2698 | return -ENOMEDIUM; |
faea38e7 FB |
2699 | if (!drv->bdrv_write_compressed) |
2700 | return -ENOTSUP; | |
fbb7b4e0 KW |
2701 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2702 | return -EIO; | |
a55eb92c | 2703 | |
c6d22830 | 2704 | if (bs->dirty_bitmap) { |
7cd1e32a LS |
2705 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
2706 | } | |
a55eb92c | 2707 | |
faea38e7 FB |
2708 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
2709 | } | |
3b46e624 | 2710 | |
faea38e7 FB |
2711 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
2712 | { | |
2713 | BlockDriver *drv = bs->drv; | |
2714 | if (!drv) | |
19cb3738 | 2715 | return -ENOMEDIUM; |
faea38e7 FB |
2716 | if (!drv->bdrv_get_info) |
2717 | return -ENOTSUP; | |
2718 | memset(bdi, 0, sizeof(*bdi)); | |
2719 | return drv->bdrv_get_info(bs, bdi); | |
2720 | } | |
2721 | ||
45566e9c CH |
2722 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
2723 | int64_t pos, int size) | |
178e08a5 AL |
2724 | { |
2725 | BlockDriver *drv = bs->drv; | |
2726 | if (!drv) | |
2727 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2728 | if (drv->bdrv_save_vmstate) |
2729 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
2730 | if (bs->file) | |
2731 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
2732 | return -ENOTSUP; | |
178e08a5 AL |
2733 | } |
2734 | ||
45566e9c CH |
2735 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2736 | int64_t pos, int size) | |
178e08a5 AL |
2737 | { |
2738 | BlockDriver *drv = bs->drv; | |
2739 | if (!drv) | |
2740 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2741 | if (drv->bdrv_load_vmstate) |
2742 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
2743 | if (bs->file) | |
2744 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
2745 | return -ENOTSUP; | |
178e08a5 AL |
2746 | } |
2747 | ||
8b9b0cc2 KW |
2748 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
2749 | { | |
2750 | BlockDriver *drv = bs->drv; | |
2751 | ||
2752 | if (!drv || !drv->bdrv_debug_event) { | |
2753 | return; | |
2754 | } | |
2755 | ||
2756 | return drv->bdrv_debug_event(bs, event); | |
2757 | ||
2758 | } | |
2759 | ||
faea38e7 FB |
2760 | /**************************************************************/ |
2761 | /* handling of snapshots */ | |
2762 | ||
feeee5ac MDCF |
2763 | int bdrv_can_snapshot(BlockDriverState *bs) |
2764 | { | |
2765 | BlockDriver *drv = bs->drv; | |
07b70bfb | 2766 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
feeee5ac MDCF |
2767 | return 0; |
2768 | } | |
2769 | ||
2770 | if (!drv->bdrv_snapshot_create) { | |
2771 | if (bs->file != NULL) { | |
2772 | return bdrv_can_snapshot(bs->file); | |
2773 | } | |
2774 | return 0; | |
2775 | } | |
2776 | ||
2777 | return 1; | |
2778 | } | |
2779 | ||
199630b6 BS |
2780 | int bdrv_is_snapshot(BlockDriverState *bs) |
2781 | { | |
2782 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
2783 | } | |
2784 | ||
f9092b10 MA |
2785 | BlockDriverState *bdrv_snapshots(void) |
2786 | { | |
2787 | BlockDriverState *bs; | |
2788 | ||
3ac906f7 | 2789 | if (bs_snapshots) { |
f9092b10 | 2790 | return bs_snapshots; |
3ac906f7 | 2791 | } |
f9092b10 MA |
2792 | |
2793 | bs = NULL; | |
2794 | while ((bs = bdrv_next(bs))) { | |
2795 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
2796 | bs_snapshots = bs; |
2797 | return bs; | |
f9092b10 MA |
2798 | } |
2799 | } | |
2800 | return NULL; | |
f9092b10 MA |
2801 | } |
2802 | ||
5fafdf24 | 2803 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
2804 | QEMUSnapshotInfo *sn_info) |
2805 | { | |
2806 | BlockDriver *drv = bs->drv; | |
2807 | if (!drv) | |
19cb3738 | 2808 | return -ENOMEDIUM; |
7cdb1f6d MK |
2809 | if (drv->bdrv_snapshot_create) |
2810 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2811 | if (bs->file) | |
2812 | return bdrv_snapshot_create(bs->file, sn_info); | |
2813 | return -ENOTSUP; | |
faea38e7 FB |
2814 | } |
2815 | ||
5fafdf24 | 2816 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
2817 | const char *snapshot_id) |
2818 | { | |
2819 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
2820 | int ret, open_ret; |
2821 | ||
faea38e7 | 2822 | if (!drv) |
19cb3738 | 2823 | return -ENOMEDIUM; |
7cdb1f6d MK |
2824 | if (drv->bdrv_snapshot_goto) |
2825 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2826 | ||
2827 | if (bs->file) { | |
2828 | drv->bdrv_close(bs); | |
2829 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2830 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2831 | if (open_ret < 0) { | |
2832 | bdrv_delete(bs->file); | |
2833 | bs->drv = NULL; | |
2834 | return open_ret; | |
2835 | } | |
2836 | return ret; | |
2837 | } | |
2838 | ||
2839 | return -ENOTSUP; | |
faea38e7 FB |
2840 | } |
2841 | ||
2842 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2843 | { | |
2844 | BlockDriver *drv = bs->drv; | |
2845 | if (!drv) | |
19cb3738 | 2846 | return -ENOMEDIUM; |
7cdb1f6d MK |
2847 | if (drv->bdrv_snapshot_delete) |
2848 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2849 | if (bs->file) | |
2850 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2851 | return -ENOTSUP; | |
faea38e7 FB |
2852 | } |
2853 | ||
5fafdf24 | 2854 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
2855 | QEMUSnapshotInfo **psn_info) |
2856 | { | |
2857 | BlockDriver *drv = bs->drv; | |
2858 | if (!drv) | |
19cb3738 | 2859 | return -ENOMEDIUM; |
7cdb1f6d MK |
2860 | if (drv->bdrv_snapshot_list) |
2861 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2862 | if (bs->file) | |
2863 | return bdrv_snapshot_list(bs->file, psn_info); | |
2864 | return -ENOTSUP; | |
faea38e7 FB |
2865 | } |
2866 | ||
51ef6727 | 2867 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
2868 | const char *snapshot_name) | |
2869 | { | |
2870 | BlockDriver *drv = bs->drv; | |
2871 | if (!drv) { | |
2872 | return -ENOMEDIUM; | |
2873 | } | |
2874 | if (!bs->read_only) { | |
2875 | return -EINVAL; | |
2876 | } | |
2877 | if (drv->bdrv_snapshot_load_tmp) { | |
2878 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2879 | } | |
2880 | return -ENOTSUP; | |
2881 | } | |
2882 | ||
e8a6bb9c MT |
2883 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
2884 | const char *backing_file) | |
2885 | { | |
2886 | if (!bs->drv) { | |
2887 | return NULL; | |
2888 | } | |
2889 | ||
2890 | if (bs->backing_hd) { | |
2891 | if (strcmp(bs->backing_file, backing_file) == 0) { | |
2892 | return bs->backing_hd; | |
2893 | } else { | |
2894 | return bdrv_find_backing_image(bs->backing_hd, backing_file); | |
2895 | } | |
2896 | } | |
2897 | ||
2898 | return NULL; | |
2899 | } | |
2900 | ||
faea38e7 FB |
2901 | #define NB_SUFFIXES 4 |
2902 | ||
2903 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2904 | { | |
2905 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2906 | int64_t base; | |
2907 | int i; | |
2908 | ||
2909 | if (size <= 999) { | |
2910 | snprintf(buf, buf_size, "%" PRId64, size); | |
2911 | } else { | |
2912 | base = 1024; | |
2913 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2914 | if (size < (10 * base)) { | |
5fafdf24 | 2915 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
2916 | (double)size / base, |
2917 | suffixes[i]); | |
2918 | break; | |
2919 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 2920 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
2921 | ((size + (base >> 1)) / base), |
2922 | suffixes[i]); | |
2923 | break; | |
2924 | } | |
2925 | base = base * 1024; | |
2926 | } | |
2927 | } | |
2928 | return buf; | |
2929 | } | |
2930 | ||
2931 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
2932 | { | |
2933 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
2934 | #ifdef _WIN32 |
2935 | struct tm *ptm; | |
2936 | #else | |
faea38e7 | 2937 | struct tm tm; |
3b9f94e1 | 2938 | #endif |
faea38e7 FB |
2939 | time_t ti; |
2940 | int64_t secs; | |
2941 | ||
2942 | if (!sn) { | |
5fafdf24 TS |
2943 | snprintf(buf, buf_size, |
2944 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
2945 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
2946 | } else { | |
2947 | ti = sn->date_sec; | |
3b9f94e1 FB |
2948 | #ifdef _WIN32 |
2949 | ptm = localtime(&ti); | |
2950 | strftime(date_buf, sizeof(date_buf), | |
2951 | "%Y-%m-%d %H:%M:%S", ptm); | |
2952 | #else | |
faea38e7 FB |
2953 | localtime_r(&ti, &tm); |
2954 | strftime(date_buf, sizeof(date_buf), | |
2955 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 2956 | #endif |
faea38e7 FB |
2957 | secs = sn->vm_clock_nsec / 1000000000; |
2958 | snprintf(clock_buf, sizeof(clock_buf), | |
2959 | "%02d:%02d:%02d.%03d", | |
2960 | (int)(secs / 3600), | |
2961 | (int)((secs / 60) % 60), | |
5fafdf24 | 2962 | (int)(secs % 60), |
faea38e7 FB |
2963 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
2964 | snprintf(buf, buf_size, | |
5fafdf24 | 2965 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
2966 | sn->id_str, sn->name, |
2967 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
2968 | date_buf, | |
2969 | clock_buf); | |
2970 | } | |
2971 | return buf; | |
2972 | } | |
2973 | ||
ea2384d3 | 2974 | /**************************************************************/ |
83f64091 | 2975 | /* async I/Os */ |
ea2384d3 | 2976 | |
3b69e4b9 | 2977 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 2978 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 2979 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 2980 | { |
bbf0a440 SH |
2981 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
2982 | ||
b2a61371 | 2983 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 2984 | cb, opaque, false); |
ea2384d3 FB |
2985 | } |
2986 | ||
f141eafe AL |
2987 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
2988 | QEMUIOVector *qiov, int nb_sectors, | |
2989 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 2990 | { |
bbf0a440 SH |
2991 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
2992 | ||
1a6e115b | 2993 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 2994 | cb, opaque, true); |
83f64091 FB |
2995 | } |
2996 | ||
40b4f539 KW |
2997 | |
2998 | typedef struct MultiwriteCB { | |
2999 | int error; | |
3000 | int num_requests; | |
3001 | int num_callbacks; | |
3002 | struct { | |
3003 | BlockDriverCompletionFunc *cb; | |
3004 | void *opaque; | |
3005 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3006 | } callbacks[]; |
3007 | } MultiwriteCB; | |
3008 | ||
3009 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3010 | { | |
3011 | int i; | |
3012 | ||
3013 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3014 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3015 | if (mcb->callbacks[i].free_qiov) { |
3016 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3017 | } | |
7267c094 | 3018 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3019 | } |
3020 | } | |
3021 | ||
3022 | static void multiwrite_cb(void *opaque, int ret) | |
3023 | { | |
3024 | MultiwriteCB *mcb = opaque; | |
3025 | ||
6d519a5f SH |
3026 | trace_multiwrite_cb(mcb, ret); |
3027 | ||
cb6d3ca0 | 3028 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3029 | mcb->error = ret; |
40b4f539 KW |
3030 | } |
3031 | ||
3032 | mcb->num_requests--; | |
3033 | if (mcb->num_requests == 0) { | |
de189a1b | 3034 | multiwrite_user_cb(mcb); |
7267c094 | 3035 | g_free(mcb); |
40b4f539 KW |
3036 | } |
3037 | } | |
3038 | ||
3039 | static int multiwrite_req_compare(const void *a, const void *b) | |
3040 | { | |
77be4366 CH |
3041 | const BlockRequest *req1 = a, *req2 = b; |
3042 | ||
3043 | /* | |
3044 | * Note that we can't simply subtract req2->sector from req1->sector | |
3045 | * here as that could overflow the return value. | |
3046 | */ | |
3047 | if (req1->sector > req2->sector) { | |
3048 | return 1; | |
3049 | } else if (req1->sector < req2->sector) { | |
3050 | return -1; | |
3051 | } else { | |
3052 | return 0; | |
3053 | } | |
40b4f539 KW |
3054 | } |
3055 | ||
3056 | /* | |
3057 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3058 | * requests that remain after merging. | |
3059 | */ | |
3060 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3061 | int num_reqs, MultiwriteCB *mcb) | |
3062 | { | |
3063 | int i, outidx; | |
3064 | ||
3065 | // Sort requests by start sector | |
3066 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3067 | ||
3068 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3069 | // filling up gaps with zero sectors. | |
3070 | outidx = 0; | |
3071 | for (i = 1; i < num_reqs; i++) { | |
3072 | int merge = 0; | |
3073 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3074 | ||
b6a127a1 | 3075 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3076 | if (reqs[i].sector <= oldreq_last) { |
3077 | merge = 1; | |
3078 | } | |
3079 | ||
e2a305fb CH |
3080 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3081 | merge = 0; | |
3082 | } | |
3083 | ||
40b4f539 KW |
3084 | if (merge) { |
3085 | size_t size; | |
7267c094 | 3086 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3087 | qemu_iovec_init(qiov, |
3088 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3089 | ||
3090 | // Add the first request to the merged one. If the requests are | |
3091 | // overlapping, drop the last sectors of the first request. | |
3092 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
3093 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
3094 | ||
b6a127a1 PB |
3095 | // We should need to add any zeros between the two requests |
3096 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3097 | |
3098 | // Add the second request | |
3099 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
3100 | ||
cbf1dff2 | 3101 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3102 | reqs[outidx].qiov = qiov; |
3103 | ||
3104 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3105 | } else { | |
3106 | outidx++; | |
3107 | reqs[outidx].sector = reqs[i].sector; | |
3108 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3109 | reqs[outidx].qiov = reqs[i].qiov; | |
3110 | } | |
3111 | } | |
3112 | ||
3113 | return outidx + 1; | |
3114 | } | |
3115 | ||
3116 | /* | |
3117 | * Submit multiple AIO write requests at once. | |
3118 | * | |
3119 | * On success, the function returns 0 and all requests in the reqs array have | |
3120 | * been submitted. In error case this function returns -1, and any of the | |
3121 | * requests may or may not be submitted yet. In particular, this means that the | |
3122 | * callback will be called for some of the requests, for others it won't. The | |
3123 | * caller must check the error field of the BlockRequest to wait for the right | |
3124 | * callbacks (if error != 0, no callback will be called). | |
3125 | * | |
3126 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3127 | * requests. However, the fields opaque and error are left unmodified as they | |
3128 | * are used to signal failure for a single request to the caller. | |
3129 | */ | |
3130 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3131 | { | |
40b4f539 KW |
3132 | MultiwriteCB *mcb; |
3133 | int i; | |
3134 | ||
301db7c2 RH |
3135 | /* don't submit writes if we don't have a medium */ |
3136 | if (bs->drv == NULL) { | |
3137 | for (i = 0; i < num_reqs; i++) { | |
3138 | reqs[i].error = -ENOMEDIUM; | |
3139 | } | |
3140 | return -1; | |
3141 | } | |
3142 | ||
40b4f539 KW |
3143 | if (num_reqs == 0) { |
3144 | return 0; | |
3145 | } | |
3146 | ||
3147 | // Create MultiwriteCB structure | |
7267c094 | 3148 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3149 | mcb->num_requests = 0; |
3150 | mcb->num_callbacks = num_reqs; | |
3151 | ||
3152 | for (i = 0; i < num_reqs; i++) { | |
3153 | mcb->callbacks[i].cb = reqs[i].cb; | |
3154 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3155 | } | |
3156 | ||
3157 | // Check for mergable requests | |
3158 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3159 | ||
6d519a5f SH |
3160 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3161 | ||
df9309fb PB |
3162 | /* Run the aio requests. */ |
3163 | mcb->num_requests = num_reqs; | |
40b4f539 | 3164 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3165 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3166 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3167 | } |
3168 | ||
3169 | return 0; | |
40b4f539 KW |
3170 | } |
3171 | ||
83f64091 | 3172 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3173 | { |
6bbff9a0 | 3174 | acb->pool->cancel(acb); |
83f64091 FB |
3175 | } |
3176 | ||
98f90dba ZYW |
3177 | /* block I/O throttling */ |
3178 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, | |
3179 | bool is_write, double elapsed_time, uint64_t *wait) | |
3180 | { | |
3181 | uint64_t bps_limit = 0; | |
3182 | double bytes_limit, bytes_base, bytes_res; | |
3183 | double slice_time, wait_time; | |
3184 | ||
3185 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3186 | bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
3187 | } else if (bs->io_limits.bps[is_write]) { | |
3188 | bps_limit = bs->io_limits.bps[is_write]; | |
3189 | } else { | |
3190 | if (wait) { | |
3191 | *wait = 0; | |
3192 | } | |
3193 | ||
3194 | return false; | |
3195 | } | |
3196 | ||
3197 | slice_time = bs->slice_end - bs->slice_start; | |
3198 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3199 | bytes_limit = bps_limit * slice_time; | |
3200 | bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; | |
3201 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3202 | bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; | |
3203 | } | |
3204 | ||
3205 | /* bytes_base: the bytes of data which have been read/written; and | |
3206 | * it is obtained from the history statistic info. | |
3207 | * bytes_res: the remaining bytes of data which need to be read/written. | |
3208 | * (bytes_base + bytes_res) / bps_limit: used to calcuate | |
3209 | * the total time for completing reading/writting all data. | |
3210 | */ | |
3211 | bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
3212 | ||
3213 | if (bytes_base + bytes_res <= bytes_limit) { | |
3214 | if (wait) { | |
3215 | *wait = 0; | |
3216 | } | |
3217 | ||
3218 | return false; | |
3219 | } | |
3220 | ||
3221 | /* Calc approx time to dispatch */ | |
3222 | wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; | |
3223 | ||
3224 | /* When the I/O rate at runtime exceeds the limits, | |
3225 | * bs->slice_end need to be extended in order that the current statistic | |
3226 | * info can be kept until the timer fire, so it is increased and tuned | |
3227 | * based on the result of experiment. | |
3228 | */ | |
3229 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3230 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3231 | if (wait) { | |
3232 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3233 | } | |
3234 | ||
3235 | return true; | |
3236 | } | |
3237 | ||
3238 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
3239 | double elapsed_time, uint64_t *wait) | |
3240 | { | |
3241 | uint64_t iops_limit = 0; | |
3242 | double ios_limit, ios_base; | |
3243 | double slice_time, wait_time; | |
3244 | ||
3245 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3246 | iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
3247 | } else if (bs->io_limits.iops[is_write]) { | |
3248 | iops_limit = bs->io_limits.iops[is_write]; | |
3249 | } else { | |
3250 | if (wait) { | |
3251 | *wait = 0; | |
3252 | } | |
3253 | ||
3254 | return false; | |
3255 | } | |
3256 | ||
3257 | slice_time = bs->slice_end - bs->slice_start; | |
3258 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3259 | ios_limit = iops_limit * slice_time; | |
3260 | ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; | |
3261 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3262 | ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; | |
3263 | } | |
3264 | ||
3265 | if (ios_base + 1 <= ios_limit) { | |
3266 | if (wait) { | |
3267 | *wait = 0; | |
3268 | } | |
3269 | ||
3270 | return false; | |
3271 | } | |
3272 | ||
3273 | /* Calc approx time to dispatch */ | |
3274 | wait_time = (ios_base + 1) / iops_limit; | |
3275 | if (wait_time > elapsed_time) { | |
3276 | wait_time = wait_time - elapsed_time; | |
3277 | } else { | |
3278 | wait_time = 0; | |
3279 | } | |
3280 | ||
3281 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3282 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3283 | if (wait) { | |
3284 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3285 | } | |
3286 | ||
3287 | return true; | |
3288 | } | |
3289 | ||
3290 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
3291 | bool is_write, int64_t *wait) | |
3292 | { | |
3293 | int64_t now, max_wait; | |
3294 | uint64_t bps_wait = 0, iops_wait = 0; | |
3295 | double elapsed_time; | |
3296 | int bps_ret, iops_ret; | |
3297 | ||
3298 | now = qemu_get_clock_ns(vm_clock); | |
3299 | if ((bs->slice_start < now) | |
3300 | && (bs->slice_end > now)) { | |
3301 | bs->slice_end = now + bs->slice_time; | |
3302 | } else { | |
3303 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
3304 | bs->slice_start = now; | |
3305 | bs->slice_end = now + bs->slice_time; | |
3306 | ||
3307 | bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; | |
3308 | bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; | |
3309 | ||
3310 | bs->io_base.ios[is_write] = bs->nr_ops[is_write]; | |
3311 | bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; | |
3312 | } | |
3313 | ||
3314 | elapsed_time = now - bs->slice_start; | |
3315 | elapsed_time /= (NANOSECONDS_PER_SECOND); | |
3316 | ||
3317 | bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, | |
3318 | is_write, elapsed_time, &bps_wait); | |
3319 | iops_ret = bdrv_exceed_iops_limits(bs, is_write, | |
3320 | elapsed_time, &iops_wait); | |
3321 | if (bps_ret || iops_ret) { | |
3322 | max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; | |
3323 | if (wait) { | |
3324 | *wait = max_wait; | |
3325 | } | |
3326 | ||
3327 | now = qemu_get_clock_ns(vm_clock); | |
3328 | if (bs->slice_end < now + max_wait) { | |
3329 | bs->slice_end = now + max_wait; | |
3330 | } | |
3331 | ||
3332 | return true; | |
3333 | } | |
3334 | ||
3335 | if (wait) { | |
3336 | *wait = 0; | |
3337 | } | |
3338 | ||
3339 | return false; | |
3340 | } | |
ce1a14dc | 3341 | |
83f64091 FB |
3342 | /**************************************************************/ |
3343 | /* async block device emulation */ | |
3344 | ||
c16b5a2c CH |
3345 | typedef struct BlockDriverAIOCBSync { |
3346 | BlockDriverAIOCB common; | |
3347 | QEMUBH *bh; | |
3348 | int ret; | |
3349 | /* vector translation state */ | |
3350 | QEMUIOVector *qiov; | |
3351 | uint8_t *bounce; | |
3352 | int is_write; | |
3353 | } BlockDriverAIOCBSync; | |
3354 | ||
3355 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3356 | { | |
b666d239 KW |
3357 | BlockDriverAIOCBSync *acb = |
3358 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3359 | qemu_bh_delete(acb->bh); |
36afc451 | 3360 | acb->bh = NULL; |
c16b5a2c CH |
3361 | qemu_aio_release(acb); |
3362 | } | |
3363 | ||
3364 | static AIOPool bdrv_em_aio_pool = { | |
3365 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
3366 | .cancel = bdrv_aio_cancel_em, | |
3367 | }; | |
3368 | ||
ce1a14dc | 3369 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3370 | { |
ce1a14dc | 3371 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3372 | |
f141eafe AL |
3373 | if (!acb->is_write) |
3374 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 3375 | qemu_vfree(acb->bounce); |
ce1a14dc | 3376 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3377 | qemu_bh_delete(acb->bh); |
36afc451 | 3378 | acb->bh = NULL; |
ce1a14dc | 3379 | qemu_aio_release(acb); |
83f64091 | 3380 | } |
beac80cd | 3381 | |
f141eafe AL |
3382 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3383 | int64_t sector_num, | |
3384 | QEMUIOVector *qiov, | |
3385 | int nb_sectors, | |
3386 | BlockDriverCompletionFunc *cb, | |
3387 | void *opaque, | |
3388 | int is_write) | |
3389 | ||
83f64091 | 3390 | { |
ce1a14dc | 3391 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3392 | |
c16b5a2c | 3393 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
3394 | acb->is_write = is_write; |
3395 | acb->qiov = qiov; | |
e268ca52 | 3396 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3397 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3398 | |
3399 | if (is_write) { | |
3400 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1ed20acf | 3401 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3402 | } else { |
1ed20acf | 3403 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3404 | } |
3405 | ||
ce1a14dc | 3406 | qemu_bh_schedule(acb->bh); |
f141eafe | 3407 | |
ce1a14dc | 3408 | return &acb->common; |
beac80cd FB |
3409 | } |
3410 | ||
f141eafe AL |
3411 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3412 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3413 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3414 | { |
f141eafe AL |
3415 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3416 | } | |
83f64091 | 3417 | |
f141eafe AL |
3418 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3419 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3420 | BlockDriverCompletionFunc *cb, void *opaque) | |
3421 | { | |
3422 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3423 | } |
beac80cd | 3424 | |
68485420 KW |
3425 | |
3426 | typedef struct BlockDriverAIOCBCoroutine { | |
3427 | BlockDriverAIOCB common; | |
3428 | BlockRequest req; | |
3429 | bool is_write; | |
3430 | QEMUBH* bh; | |
3431 | } BlockDriverAIOCBCoroutine; | |
3432 | ||
3433 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3434 | { | |
3435 | qemu_aio_flush(); | |
3436 | } | |
3437 | ||
3438 | static AIOPool bdrv_em_co_aio_pool = { | |
3439 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), | |
3440 | .cancel = bdrv_aio_co_cancel_em, | |
3441 | }; | |
3442 | ||
35246a68 | 3443 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3444 | { |
3445 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3446 | ||
3447 | acb->common.cb(acb->common.opaque, acb->req.error); | |
3448 | qemu_bh_delete(acb->bh); | |
3449 | qemu_aio_release(acb); | |
3450 | } | |
3451 | ||
b2a61371 SH |
3452 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3453 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3454 | { | |
3455 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3456 | BlockDriverState *bs = acb->common.bs; | |
3457 | ||
3458 | if (!acb->is_write) { | |
3459 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3460 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3461 | } else { |
3462 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3463 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3464 | } |
3465 | ||
35246a68 | 3466 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3467 | qemu_bh_schedule(acb->bh); |
3468 | } | |
3469 | ||
68485420 KW |
3470 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3471 | int64_t sector_num, | |
3472 | QEMUIOVector *qiov, | |
3473 | int nb_sectors, | |
3474 | BlockDriverCompletionFunc *cb, | |
3475 | void *opaque, | |
8c5873d6 | 3476 | bool is_write) |
68485420 KW |
3477 | { |
3478 | Coroutine *co; | |
3479 | BlockDriverAIOCBCoroutine *acb; | |
3480 | ||
3481 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3482 | acb->req.sector = sector_num; | |
3483 | acb->req.nb_sectors = nb_sectors; | |
3484 | acb->req.qiov = qiov; | |
3485 | acb->is_write = is_write; | |
3486 | ||
8c5873d6 | 3487 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3488 | qemu_coroutine_enter(co, acb); |
3489 | ||
3490 | return &acb->common; | |
3491 | } | |
3492 | ||
07f07615 | 3493 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3494 | { |
07f07615 PB |
3495 | BlockDriverAIOCBCoroutine *acb = opaque; |
3496 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3497 | |
07f07615 PB |
3498 | acb->req.error = bdrv_co_flush(bs); |
3499 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3500 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3501 | } |
3502 | ||
07f07615 | 3503 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3504 | BlockDriverCompletionFunc *cb, void *opaque) |
3505 | { | |
07f07615 | 3506 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3507 | |
07f07615 PB |
3508 | Coroutine *co; |
3509 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3510 | |
07f07615 PB |
3511 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
3512 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); | |
3513 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3514 | |
016f5cf6 AG |
3515 | return &acb->common; |
3516 | } | |
3517 | ||
4265d620 PB |
3518 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3519 | { | |
3520 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3521 | BlockDriverState *bs = acb->common.bs; | |
3522 | ||
3523 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3524 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3525 | qemu_bh_schedule(acb->bh); | |
3526 | } | |
3527 | ||
3528 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3529 | int64_t sector_num, int nb_sectors, | |
3530 | BlockDriverCompletionFunc *cb, void *opaque) | |
3531 | { | |
3532 | Coroutine *co; | |
3533 | BlockDriverAIOCBCoroutine *acb; | |
3534 | ||
3535 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3536 | ||
3537 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3538 | acb->req.sector = sector_num; | |
3539 | acb->req.nb_sectors = nb_sectors; | |
3540 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
3541 | qemu_coroutine_enter(co, acb); | |
3542 | ||
3543 | return &acb->common; | |
3544 | } | |
3545 | ||
ea2384d3 FB |
3546 | void bdrv_init(void) |
3547 | { | |
5efa9d5a | 3548 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3549 | } |
ce1a14dc | 3550 | |
eb852011 MA |
3551 | void bdrv_init_with_whitelist(void) |
3552 | { | |
3553 | use_bdrv_whitelist = 1; | |
3554 | bdrv_init(); | |
3555 | } | |
3556 | ||
c16b5a2c CH |
3557 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
3558 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 3559 | { |
ce1a14dc PB |
3560 | BlockDriverAIOCB *acb; |
3561 | ||
6bbff9a0 AL |
3562 | if (pool->free_aiocb) { |
3563 | acb = pool->free_aiocb; | |
3564 | pool->free_aiocb = acb->next; | |
ce1a14dc | 3565 | } else { |
7267c094 | 3566 | acb = g_malloc0(pool->aiocb_size); |
6bbff9a0 | 3567 | acb->pool = pool; |
ce1a14dc PB |
3568 | } |
3569 | acb->bs = bs; | |
3570 | acb->cb = cb; | |
3571 | acb->opaque = opaque; | |
3572 | return acb; | |
3573 | } | |
3574 | ||
3575 | void qemu_aio_release(void *p) | |
3576 | { | |
6bbff9a0 AL |
3577 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
3578 | AIOPool *pool = acb->pool; | |
3579 | acb->next = pool->free_aiocb; | |
3580 | pool->free_aiocb = acb; | |
ce1a14dc | 3581 | } |
19cb3738 | 3582 | |
f9f05dc5 KW |
3583 | /**************************************************************/ |
3584 | /* Coroutine block device emulation */ | |
3585 | ||
3586 | typedef struct CoroutineIOCompletion { | |
3587 | Coroutine *coroutine; | |
3588 | int ret; | |
3589 | } CoroutineIOCompletion; | |
3590 | ||
3591 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3592 | { | |
3593 | CoroutineIOCompletion *co = opaque; | |
3594 | ||
3595 | co->ret = ret; | |
3596 | qemu_coroutine_enter(co->coroutine, NULL); | |
3597 | } | |
3598 | ||
3599 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3600 | int nb_sectors, QEMUIOVector *iov, | |
3601 | bool is_write) | |
3602 | { | |
3603 | CoroutineIOCompletion co = { | |
3604 | .coroutine = qemu_coroutine_self(), | |
3605 | }; | |
3606 | BlockDriverAIOCB *acb; | |
3607 | ||
3608 | if (is_write) { | |
a652d160 SH |
3609 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3610 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3611 | } else { |
a652d160 SH |
3612 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3613 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3614 | } |
3615 | ||
59370aaa | 3616 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3617 | if (!acb) { |
3618 | return -EIO; | |
3619 | } | |
3620 | qemu_coroutine_yield(); | |
3621 | ||
3622 | return co.ret; | |
3623 | } | |
3624 | ||
3625 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
3626 | int64_t sector_num, int nb_sectors, | |
3627 | QEMUIOVector *iov) | |
3628 | { | |
3629 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
3630 | } | |
3631 | ||
3632 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
3633 | int64_t sector_num, int nb_sectors, | |
3634 | QEMUIOVector *iov) | |
3635 | { | |
3636 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
3637 | } | |
3638 | ||
07f07615 | 3639 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 3640 | { |
07f07615 PB |
3641 | RwCo *rwco = opaque; |
3642 | ||
3643 | rwco->ret = bdrv_co_flush(rwco->bs); | |
3644 | } | |
3645 | ||
3646 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
3647 | { | |
eb489bb1 KW |
3648 | int ret; |
3649 | ||
29cdb251 | 3650 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 3651 | return 0; |
eb489bb1 KW |
3652 | } |
3653 | ||
ca716364 | 3654 | /* Write back cached data to the OS even with cache=unsafe */ |
eb489bb1 KW |
3655 | if (bs->drv->bdrv_co_flush_to_os) { |
3656 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
3657 | if (ret < 0) { | |
3658 | return ret; | |
3659 | } | |
3660 | } | |
3661 | ||
ca716364 KW |
3662 | /* But don't actually force it to the disk with cache=unsafe */ |
3663 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
3664 | return 0; | |
3665 | } | |
3666 | ||
eb489bb1 | 3667 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 3668 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
3669 | } else if (bs->drv->bdrv_aio_flush) { |
3670 | BlockDriverAIOCB *acb; | |
3671 | CoroutineIOCompletion co = { | |
3672 | .coroutine = qemu_coroutine_self(), | |
3673 | }; | |
3674 | ||
3675 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
3676 | if (acb == NULL) { | |
29cdb251 | 3677 | ret = -EIO; |
07f07615 PB |
3678 | } else { |
3679 | qemu_coroutine_yield(); | |
29cdb251 | 3680 | ret = co.ret; |
07f07615 | 3681 | } |
07f07615 PB |
3682 | } else { |
3683 | /* | |
3684 | * Some block drivers always operate in either writethrough or unsafe | |
3685 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
3686 | * know how the server works (because the behaviour is hardcoded or | |
3687 | * depends on server-side configuration), so we can't ensure that | |
3688 | * everything is safe on disk. Returning an error doesn't work because | |
3689 | * that would break guests even if the server operates in writethrough | |
3690 | * mode. | |
3691 | * | |
3692 | * Let's hope the user knows what he's doing. | |
3693 | */ | |
29cdb251 | 3694 | ret = 0; |
07f07615 | 3695 | } |
29cdb251 PB |
3696 | if (ret < 0) { |
3697 | return ret; | |
3698 | } | |
3699 | ||
3700 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
3701 | * in the case of cache=unsafe, so there are no useless flushes. | |
3702 | */ | |
3703 | return bdrv_co_flush(bs->file); | |
07f07615 PB |
3704 | } |
3705 | ||
0f15423c AL |
3706 | void bdrv_invalidate_cache(BlockDriverState *bs) |
3707 | { | |
3708 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
3709 | bs->drv->bdrv_invalidate_cache(bs); | |
3710 | } | |
3711 | } | |
3712 | ||
3713 | void bdrv_invalidate_cache_all(void) | |
3714 | { | |
3715 | BlockDriverState *bs; | |
3716 | ||
3717 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
3718 | bdrv_invalidate_cache(bs); | |
3719 | } | |
3720 | } | |
3721 | ||
07789269 BC |
3722 | void bdrv_clear_incoming_migration_all(void) |
3723 | { | |
3724 | BlockDriverState *bs; | |
3725 | ||
3726 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
3727 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
3728 | } | |
3729 | } | |
3730 | ||
07f07615 PB |
3731 | int bdrv_flush(BlockDriverState *bs) |
3732 | { | |
3733 | Coroutine *co; | |
3734 | RwCo rwco = { | |
3735 | .bs = bs, | |
3736 | .ret = NOT_DONE, | |
e7a8a783 | 3737 | }; |
e7a8a783 | 3738 | |
07f07615 PB |
3739 | if (qemu_in_coroutine()) { |
3740 | /* Fast-path if already in coroutine context */ | |
3741 | bdrv_flush_co_entry(&rwco); | |
3742 | } else { | |
3743 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
3744 | qemu_coroutine_enter(co, &rwco); | |
3745 | while (rwco.ret == NOT_DONE) { | |
3746 | qemu_aio_wait(); | |
3747 | } | |
e7a8a783 | 3748 | } |
07f07615 PB |
3749 | |
3750 | return rwco.ret; | |
e7a8a783 KW |
3751 | } |
3752 | ||
4265d620 PB |
3753 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
3754 | { | |
3755 | RwCo *rwco = opaque; | |
3756 | ||
3757 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
3758 | } | |
3759 | ||
3760 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
3761 | int nb_sectors) | |
3762 | { | |
3763 | if (!bs->drv) { | |
3764 | return -ENOMEDIUM; | |
3765 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
3766 | return -EIO; | |
3767 | } else if (bs->read_only) { | |
3768 | return -EROFS; | |
3769 | } else if (bs->drv->bdrv_co_discard) { | |
3770 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); | |
3771 | } else if (bs->drv->bdrv_aio_discard) { | |
3772 | BlockDriverAIOCB *acb; | |
3773 | CoroutineIOCompletion co = { | |
3774 | .coroutine = qemu_coroutine_self(), | |
3775 | }; | |
3776 | ||
3777 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
3778 | bdrv_co_io_em_complete, &co); | |
3779 | if (acb == NULL) { | |
3780 | return -EIO; | |
3781 | } else { | |
3782 | qemu_coroutine_yield(); | |
3783 | return co.ret; | |
3784 | } | |
4265d620 PB |
3785 | } else { |
3786 | return 0; | |
3787 | } | |
3788 | } | |
3789 | ||
3790 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
3791 | { | |
3792 | Coroutine *co; | |
3793 | RwCo rwco = { | |
3794 | .bs = bs, | |
3795 | .sector_num = sector_num, | |
3796 | .nb_sectors = nb_sectors, | |
3797 | .ret = NOT_DONE, | |
3798 | }; | |
3799 | ||
3800 | if (qemu_in_coroutine()) { | |
3801 | /* Fast-path if already in coroutine context */ | |
3802 | bdrv_discard_co_entry(&rwco); | |
3803 | } else { | |
3804 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
3805 | qemu_coroutine_enter(co, &rwco); | |
3806 | while (rwco.ret == NOT_DONE) { | |
3807 | qemu_aio_wait(); | |
3808 | } | |
3809 | } | |
3810 | ||
3811 | return rwco.ret; | |
3812 | } | |
3813 | ||
19cb3738 FB |
3814 | /**************************************************************/ |
3815 | /* removable device support */ | |
3816 | ||
3817 | /** | |
3818 | * Return TRUE if the media is present | |
3819 | */ | |
3820 | int bdrv_is_inserted(BlockDriverState *bs) | |
3821 | { | |
3822 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 3823 | |
19cb3738 FB |
3824 | if (!drv) |
3825 | return 0; | |
3826 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
3827 | return 1; |
3828 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
3829 | } |
3830 | ||
3831 | /** | |
8e49ca46 MA |
3832 | * Return whether the media changed since the last call to this |
3833 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
3834 | */ |
3835 | int bdrv_media_changed(BlockDriverState *bs) | |
3836 | { | |
3837 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3838 | |
8e49ca46 MA |
3839 | if (drv && drv->bdrv_media_changed) { |
3840 | return drv->bdrv_media_changed(bs); | |
3841 | } | |
3842 | return -ENOTSUP; | |
19cb3738 FB |
3843 | } |
3844 | ||
3845 | /** | |
3846 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
3847 | */ | |
f36f3949 | 3848 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
3849 | { |
3850 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3851 | |
822e1cd1 MA |
3852 | if (drv && drv->bdrv_eject) { |
3853 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 3854 | } |
6f382ed2 LC |
3855 | |
3856 | if (bs->device_name[0] != '\0') { | |
3857 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
3858 | } | |
19cb3738 FB |
3859 | } |
3860 | ||
19cb3738 FB |
3861 | /** |
3862 | * Lock or unlock the media (if it is locked, the user won't be able | |
3863 | * to eject it manually). | |
3864 | */ | |
025e849a | 3865 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
3866 | { |
3867 | BlockDriver *drv = bs->drv; | |
3868 | ||
025e849a | 3869 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 3870 | |
025e849a MA |
3871 | if (drv && drv->bdrv_lock_medium) { |
3872 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
3873 | } |
3874 | } | |
985a03b0 TS |
3875 | |
3876 | /* needed for generic scsi interface */ | |
3877 | ||
3878 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
3879 | { | |
3880 | BlockDriver *drv = bs->drv; | |
3881 | ||
3882 | if (drv && drv->bdrv_ioctl) | |
3883 | return drv->bdrv_ioctl(bs, req, buf); | |
3884 | return -ENOTSUP; | |
3885 | } | |
7d780669 | 3886 | |
221f715d AL |
3887 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
3888 | unsigned long int req, void *buf, | |
3889 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 3890 | { |
221f715d | 3891 | BlockDriver *drv = bs->drv; |
7d780669 | 3892 | |
221f715d AL |
3893 | if (drv && drv->bdrv_aio_ioctl) |
3894 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
3895 | return NULL; | |
7d780669 | 3896 | } |
e268ca52 | 3897 | |
7b6f9300 MA |
3898 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
3899 | { | |
3900 | bs->buffer_alignment = align; | |
3901 | } | |
7cd1e32a | 3902 | |
e268ca52 AL |
3903 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
3904 | { | |
3905 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
3906 | } | |
7cd1e32a LS |
3907 | |
3908 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
3909 | { | |
3910 | int64_t bitmap_size; | |
a55eb92c | 3911 | |
aaa0eb75 | 3912 | bs->dirty_count = 0; |
a55eb92c | 3913 | if (enable) { |
c6d22830 JK |
3914 | if (!bs->dirty_bitmap) { |
3915 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
71df14fc PB |
3916 | BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG - 1; |
3917 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG; | |
a55eb92c | 3918 | |
71df14fc | 3919 | bs->dirty_bitmap = g_new0(unsigned long, bitmap_size); |
a55eb92c | 3920 | } |
7cd1e32a | 3921 | } else { |
c6d22830 | 3922 | if (bs->dirty_bitmap) { |
7267c094 | 3923 | g_free(bs->dirty_bitmap); |
c6d22830 | 3924 | bs->dirty_bitmap = NULL; |
a55eb92c | 3925 | } |
7cd1e32a LS |
3926 | } |
3927 | } | |
3928 | ||
3929 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
3930 | { | |
6ea44308 | 3931 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 3932 | |
c6d22830 JK |
3933 | if (bs->dirty_bitmap && |
3934 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
6d59fec1 MT |
3935 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
3936 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
7cd1e32a LS |
3937 | } else { |
3938 | return 0; | |
3939 | } | |
3940 | } | |
3941 | ||
a55eb92c JK |
3942 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
3943 | int nr_sectors) | |
7cd1e32a LS |
3944 | { |
3945 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
3946 | } | |
aaa0eb75 LS |
3947 | |
3948 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
3949 | { | |
3950 | return bs->dirty_count; | |
3951 | } | |
f88e1a42 | 3952 | |
db593f25 MT |
3953 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
3954 | { | |
3955 | assert(bs->in_use != in_use); | |
3956 | bs->in_use = in_use; | |
3957 | } | |
3958 | ||
3959 | int bdrv_in_use(BlockDriverState *bs) | |
3960 | { | |
3961 | return bs->in_use; | |
3962 | } | |
3963 | ||
28a7282a LC |
3964 | void bdrv_iostatus_enable(BlockDriverState *bs) |
3965 | { | |
d6bf279e | 3966 | bs->iostatus_enabled = true; |
58e21ef5 | 3967 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
3968 | } |
3969 | ||
3970 | /* The I/O status is only enabled if the drive explicitly | |
3971 | * enables it _and_ the VM is configured to stop on errors */ | |
3972 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
3973 | { | |
d6bf279e | 3974 | return (bs->iostatus_enabled && |
28a7282a LC |
3975 | (bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || |
3976 | bs->on_write_error == BLOCK_ERR_STOP_ANY || | |
3977 | bs->on_read_error == BLOCK_ERR_STOP_ANY)); | |
3978 | } | |
3979 | ||
3980 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
3981 | { | |
d6bf279e | 3982 | bs->iostatus_enabled = false; |
28a7282a LC |
3983 | } |
3984 | ||
3985 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
3986 | { | |
3987 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 3988 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
3989 | } |
3990 | } | |
3991 | ||
3992 | /* XXX: Today this is set by device models because it makes the implementation | |
3993 | quite simple. However, the block layer knows about the error, so it's | |
3994 | possible to implement this without device models being involved */ | |
3995 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) | |
3996 | { | |
58e21ef5 LC |
3997 | if (bdrv_iostatus_is_enabled(bs) && |
3998 | bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
28a7282a | 3999 | assert(error >= 0); |
58e21ef5 LC |
4000 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4001 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4002 | } |
4003 | } | |
4004 | ||
a597e79c CH |
4005 | void |
4006 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4007 | enum BlockAcctType type) | |
4008 | { | |
4009 | assert(type < BDRV_MAX_IOTYPE); | |
4010 | ||
4011 | cookie->bytes = bytes; | |
c488c7f6 | 4012 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4013 | cookie->type = type; |
4014 | } | |
4015 | ||
4016 | void | |
4017 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4018 | { | |
4019 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4020 | ||
4021 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4022 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4023 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4024 | } |
4025 | ||
f88e1a42 JS |
4026 | int bdrv_img_create(const char *filename, const char *fmt, |
4027 | const char *base_filename, const char *base_fmt, | |
4028 | char *options, uint64_t img_size, int flags) | |
4029 | { | |
4030 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4031 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4032 | BlockDriverState *bs = NULL; |
4033 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4034 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4035 | int ret = 0; |
4036 | ||
4037 | /* Find driver and parse its options */ | |
4038 | drv = bdrv_find_format(fmt); | |
4039 | if (!drv) { | |
4040 | error_report("Unknown file format '%s'", fmt); | |
4f70f249 | 4041 | ret = -EINVAL; |
f88e1a42 JS |
4042 | goto out; |
4043 | } | |
4044 | ||
4045 | proto_drv = bdrv_find_protocol(filename); | |
4046 | if (!proto_drv) { | |
4047 | error_report("Unknown protocol '%s'", filename); | |
4f70f249 | 4048 | ret = -EINVAL; |
f88e1a42 JS |
4049 | goto out; |
4050 | } | |
4051 | ||
4052 | create_options = append_option_parameters(create_options, | |
4053 | drv->create_options); | |
4054 | create_options = append_option_parameters(create_options, | |
4055 | proto_drv->create_options); | |
4056 | ||
4057 | /* Create parameter list with default values */ | |
4058 | param = parse_option_parameters("", create_options, param); | |
4059 | ||
4060 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4061 | ||
4062 | /* Parse -o options */ | |
4063 | if (options) { | |
4064 | param = parse_option_parameters(options, create_options, param); | |
4065 | if (param == NULL) { | |
4066 | error_report("Invalid options for file format '%s'.", fmt); | |
4f70f249 | 4067 | ret = -EINVAL; |
f88e1a42 JS |
4068 | goto out; |
4069 | } | |
4070 | } | |
4071 | ||
4072 | if (base_filename) { | |
4073 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4074 | base_filename)) { | |
4075 | error_report("Backing file not supported for file format '%s'", | |
4076 | fmt); | |
4f70f249 | 4077 | ret = -EINVAL; |
f88e1a42 JS |
4078 | goto out; |
4079 | } | |
4080 | } | |
4081 | ||
4082 | if (base_fmt) { | |
4083 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
4084 | error_report("Backing file format not supported for file " | |
4085 | "format '%s'", fmt); | |
4f70f249 | 4086 | ret = -EINVAL; |
f88e1a42 JS |
4087 | goto out; |
4088 | } | |
4089 | } | |
4090 | ||
792da93a JS |
4091 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4092 | if (backing_file && backing_file->value.s) { | |
4093 | if (!strcmp(filename, backing_file->value.s)) { | |
4094 | error_report("Error: Trying to create an image with the " | |
4095 | "same filename as the backing file"); | |
4f70f249 | 4096 | ret = -EINVAL; |
792da93a JS |
4097 | goto out; |
4098 | } | |
4099 | } | |
4100 | ||
f88e1a42 JS |
4101 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4102 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4103 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4104 | if (!backing_drv) { | |
f88e1a42 JS |
4105 | error_report("Unknown backing file format '%s'", |
4106 | backing_fmt->value.s); | |
4f70f249 | 4107 | ret = -EINVAL; |
f88e1a42 JS |
4108 | goto out; |
4109 | } | |
4110 | } | |
4111 | ||
4112 | // The size for the image must always be specified, with one exception: | |
4113 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4114 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4115 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4116 | if (backing_file && backing_file->value.s) { |
4117 | uint64_t size; | |
f88e1a42 | 4118 | char buf[32]; |
63090dac PB |
4119 | int back_flags; |
4120 | ||
4121 | /* backing files always opened read-only */ | |
4122 | back_flags = | |
4123 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4124 | |
f88e1a42 JS |
4125 | bs = bdrv_new(""); |
4126 | ||
63090dac | 4127 | ret = bdrv_open(bs, backing_file->value.s, back_flags, backing_drv); |
f88e1a42 | 4128 | if (ret < 0) { |
96df67d1 | 4129 | error_report("Could not open '%s'", backing_file->value.s); |
f88e1a42 JS |
4130 | goto out; |
4131 | } | |
4132 | bdrv_get_geometry(bs, &size); | |
4133 | size *= 512; | |
4134 | ||
4135 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4136 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4137 | } else { | |
4138 | error_report("Image creation needs a size parameter"); | |
4f70f249 | 4139 | ret = -EINVAL; |
f88e1a42 JS |
4140 | goto out; |
4141 | } | |
4142 | } | |
4143 | ||
4144 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4145 | print_option_parameters(param); | |
4146 | puts(""); | |
4147 | ||
4148 | ret = bdrv_create(drv, filename, param); | |
4149 | ||
4150 | if (ret < 0) { | |
4151 | if (ret == -ENOTSUP) { | |
4152 | error_report("Formatting or formatting option not supported for " | |
4153 | "file format '%s'", fmt); | |
4154 | } else if (ret == -EFBIG) { | |
4155 | error_report("The image size is too large for file format '%s'", | |
4156 | fmt); | |
4157 | } else { | |
4158 | error_report("%s: error while creating %s: %s", filename, fmt, | |
4159 | strerror(-ret)); | |
4160 | } | |
4161 | } | |
4162 | ||
4163 | out: | |
4164 | free_option_parameters(create_options); | |
4165 | free_option_parameters(param); | |
4166 | ||
4167 | if (bs) { | |
4168 | bdrv_delete(bs); | |
4169 | } | |
4f70f249 JS |
4170 | |
4171 | return ret; | |
f88e1a42 | 4172 | } |
eeec61f2 SH |
4173 | |
4174 | void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, | |
c83c66c3 SH |
4175 | int64_t speed, BlockDriverCompletionFunc *cb, |
4176 | void *opaque, Error **errp) | |
eeec61f2 SH |
4177 | { |
4178 | BlockJob *job; | |
4179 | ||
4180 | if (bs->job || bdrv_in_use(bs)) { | |
fd7f8c65 | 4181 | error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
eeec61f2 SH |
4182 | return NULL; |
4183 | } | |
4184 | bdrv_set_in_use(bs, 1); | |
4185 | ||
4186 | job = g_malloc0(job_type->instance_size); | |
4187 | job->job_type = job_type; | |
4188 | job->bs = bs; | |
4189 | job->cb = cb; | |
4190 | job->opaque = opaque; | |
4513eafe | 4191 | job->busy = true; |
eeec61f2 | 4192 | bs->job = job; |
c83c66c3 SH |
4193 | |
4194 | /* Only set speed when necessary to avoid NotSupported error */ | |
4195 | if (speed != 0) { | |
4196 | Error *local_err = NULL; | |
4197 | ||
4198 | block_job_set_speed(job, speed, &local_err); | |
4199 | if (error_is_set(&local_err)) { | |
4200 | bs->job = NULL; | |
4201 | g_free(job); | |
4202 | bdrv_set_in_use(bs, 0); | |
4203 | error_propagate(errp, local_err); | |
4204 | return NULL; | |
4205 | } | |
4206 | } | |
eeec61f2 SH |
4207 | return job; |
4208 | } | |
4209 | ||
4210 | void block_job_complete(BlockJob *job, int ret) | |
4211 | { | |
4212 | BlockDriverState *bs = job->bs; | |
4213 | ||
4214 | assert(bs->job == job); | |
4215 | job->cb(job->opaque, ret); | |
4216 | bs->job = NULL; | |
4217 | g_free(job); | |
4218 | bdrv_set_in_use(bs, 0); | |
4219 | } | |
4220 | ||
882ec7ce | 4221 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
eeec61f2 | 4222 | { |
9e6636c7 | 4223 | Error *local_err = NULL; |
9f25eccc | 4224 | |
eeec61f2 | 4225 | if (!job->job_type->set_speed) { |
9e6636c7 SH |
4226 | error_set(errp, QERR_NOT_SUPPORTED); |
4227 | return; | |
eeec61f2 | 4228 | } |
882ec7ce | 4229 | job->job_type->set_speed(job, speed, &local_err); |
9e6636c7 SH |
4230 | if (error_is_set(&local_err)) { |
4231 | error_propagate(errp, local_err); | |
4232 | return; | |
9f25eccc | 4233 | } |
9e6636c7 | 4234 | |
882ec7ce | 4235 | job->speed = speed; |
eeec61f2 SH |
4236 | } |
4237 | ||
4238 | void block_job_cancel(BlockJob *job) | |
4239 | { | |
4240 | job->cancelled = true; | |
4241 | } | |
4242 | ||
4243 | bool block_job_is_cancelled(BlockJob *job) | |
4244 | { | |
4245 | return job->cancelled; | |
4246 | } | |
3e914655 PB |
4247 | |
4248 | void block_job_cancel_sync(BlockJob *job) | |
4249 | { | |
4250 | BlockDriverState *bs = job->bs; | |
4251 | ||
4252 | assert(bs->job == job); | |
4253 | block_job_cancel(job); | |
4254 | while (bs->job != NULL && bs->job->busy) { | |
4255 | qemu_aio_wait(); | |
4256 | } | |
4257 | } | |
4513eafe PB |
4258 | |
4259 | void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns) | |
4260 | { | |
4261 | /* Check cancellation *before* setting busy = false, too! */ | |
4262 | if (!block_job_is_cancelled(job)) { | |
4263 | job->busy = false; | |
4264 | co_sleep_ns(clock, ns); | |
4265 | job->busy = true; | |
4266 | } | |
4267 | } |