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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 | { | |
947995c0 PB |
201 | const char *p; |
202 | ||
9e0b22f4 SH |
203 | #ifdef _WIN32 |
204 | if (is_windows_drive(path) || | |
205 | is_windows_drive_prefix(path)) { | |
206 | return 0; | |
207 | } | |
947995c0 PB |
208 | p = path + strcspn(path, ":/\\"); |
209 | #else | |
210 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
211 | #endif |
212 | ||
947995c0 | 213 | return *p == ':'; |
9e0b22f4 SH |
214 | } |
215 | ||
83f64091 | 216 | int path_is_absolute(const char *path) |
3b0d4f61 | 217 | { |
21664424 FB |
218 | #ifdef _WIN32 |
219 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 220 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 221 | return 1; |
f53f4da9 PB |
222 | } |
223 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 224 | #else |
f53f4da9 | 225 | return (*path == '/'); |
3b9f94e1 | 226 | #endif |
3b0d4f61 FB |
227 | } |
228 | ||
83f64091 FB |
229 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
230 | path to it by considering it is relative to base_path. URL are | |
231 | supported. */ | |
232 | void path_combine(char *dest, int dest_size, | |
233 | const char *base_path, | |
234 | const char *filename) | |
3b0d4f61 | 235 | { |
83f64091 FB |
236 | const char *p, *p1; |
237 | int len; | |
238 | ||
239 | if (dest_size <= 0) | |
240 | return; | |
241 | if (path_is_absolute(filename)) { | |
242 | pstrcpy(dest, dest_size, filename); | |
243 | } else { | |
244 | p = strchr(base_path, ':'); | |
245 | if (p) | |
246 | p++; | |
247 | else | |
248 | p = base_path; | |
3b9f94e1 FB |
249 | p1 = strrchr(base_path, '/'); |
250 | #ifdef _WIN32 | |
251 | { | |
252 | const char *p2; | |
253 | p2 = strrchr(base_path, '\\'); | |
254 | if (!p1 || p2 > p1) | |
255 | p1 = p2; | |
256 | } | |
257 | #endif | |
83f64091 FB |
258 | if (p1) |
259 | p1++; | |
260 | else | |
261 | p1 = base_path; | |
262 | if (p1 > p) | |
263 | p = p1; | |
264 | len = p - base_path; | |
265 | if (len > dest_size - 1) | |
266 | len = dest_size - 1; | |
267 | memcpy(dest, base_path, len); | |
268 | dest[len] = '\0'; | |
269 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 270 | } |
3b0d4f61 FB |
271 | } |
272 | ||
dc5a1371 PB |
273 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
274 | { | |
275 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
276 | pstrcpy(dest, sz, bs->backing_file); | |
277 | } else { | |
278 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
279 | } | |
280 | } | |
281 | ||
5efa9d5a | 282 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 283 | { |
8c5873d6 SH |
284 | /* Block drivers without coroutine functions need emulation */ |
285 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
286 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
287 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
288 | ||
f8c35c1d SH |
289 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
290 | * the block driver lacks aio we need to emulate that too. | |
291 | */ | |
f9f05dc5 KW |
292 | if (!bdrv->bdrv_aio_readv) { |
293 | /* add AIO emulation layer */ | |
294 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
295 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 296 | } |
83f64091 | 297 | } |
b2e12bc6 | 298 | |
8a22f02a | 299 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 300 | } |
b338082b FB |
301 | |
302 | /* create a new block device (by default it is empty) */ | |
303 | BlockDriverState *bdrv_new(const char *device_name) | |
304 | { | |
1b7bdbc1 | 305 | BlockDriverState *bs; |
b338082b | 306 | |
7267c094 | 307 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 308 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 309 | if (device_name[0] != '\0') { |
1b7bdbc1 | 310 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 311 | } |
28a7282a | 312 | bdrv_iostatus_disable(bs); |
b338082b FB |
313 | return bs; |
314 | } | |
315 | ||
ea2384d3 FB |
316 | BlockDriver *bdrv_find_format(const char *format_name) |
317 | { | |
318 | BlockDriver *drv1; | |
8a22f02a SH |
319 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
320 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 321 | return drv1; |
8a22f02a | 322 | } |
ea2384d3 FB |
323 | } |
324 | return NULL; | |
325 | } | |
326 | ||
eb852011 MA |
327 | static int bdrv_is_whitelisted(BlockDriver *drv) |
328 | { | |
329 | static const char *whitelist[] = { | |
330 | CONFIG_BDRV_WHITELIST | |
331 | }; | |
332 | const char **p; | |
333 | ||
334 | if (!whitelist[0]) | |
335 | return 1; /* no whitelist, anything goes */ | |
336 | ||
337 | for (p = whitelist; *p; p++) { | |
338 | if (!strcmp(drv->format_name, *p)) { | |
339 | return 1; | |
340 | } | |
341 | } | |
342 | return 0; | |
343 | } | |
344 | ||
345 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
346 | { | |
347 | BlockDriver *drv = bdrv_find_format(format_name); | |
348 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
349 | } | |
350 | ||
5b7e1542 ZYW |
351 | typedef struct CreateCo { |
352 | BlockDriver *drv; | |
353 | char *filename; | |
354 | QEMUOptionParameter *options; | |
355 | int ret; | |
356 | } CreateCo; | |
357 | ||
358 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
359 | { | |
360 | CreateCo *cco = opaque; | |
361 | assert(cco->drv); | |
362 | ||
363 | cco->ret = cco->drv->bdrv_create(cco->filename, cco->options); | |
364 | } | |
365 | ||
0e7e1989 KW |
366 | int bdrv_create(BlockDriver *drv, const char* filename, |
367 | QEMUOptionParameter *options) | |
ea2384d3 | 368 | { |
5b7e1542 ZYW |
369 | int ret; |
370 | ||
371 | Coroutine *co; | |
372 | CreateCo cco = { | |
373 | .drv = drv, | |
374 | .filename = g_strdup(filename), | |
375 | .options = options, | |
376 | .ret = NOT_DONE, | |
377 | }; | |
378 | ||
379 | if (!drv->bdrv_create) { | |
ea2384d3 | 380 | return -ENOTSUP; |
5b7e1542 ZYW |
381 | } |
382 | ||
383 | if (qemu_in_coroutine()) { | |
384 | /* Fast-path if already in coroutine context */ | |
385 | bdrv_create_co_entry(&cco); | |
386 | } else { | |
387 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
388 | qemu_coroutine_enter(co, &cco); | |
389 | while (cco.ret == NOT_DONE) { | |
390 | qemu_aio_wait(); | |
391 | } | |
392 | } | |
393 | ||
394 | ret = cco.ret; | |
395 | g_free(cco.filename); | |
0e7e1989 | 396 | |
5b7e1542 | 397 | return ret; |
ea2384d3 FB |
398 | } |
399 | ||
84a12e66 CH |
400 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
401 | { | |
402 | BlockDriver *drv; | |
403 | ||
b50cbabc | 404 | drv = bdrv_find_protocol(filename); |
84a12e66 | 405 | if (drv == NULL) { |
16905d71 | 406 | return -ENOENT; |
84a12e66 CH |
407 | } |
408 | ||
409 | return bdrv_create(drv, filename, options); | |
410 | } | |
411 | ||
eba25057 JM |
412 | /* |
413 | * Create a uniquely-named empty temporary file. | |
414 | * Return 0 upon success, otherwise a negative errno value. | |
415 | */ | |
416 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 417 | { |
eba25057 | 418 | #ifdef _WIN32 |
3b9f94e1 | 419 | char temp_dir[MAX_PATH]; |
eba25057 JM |
420 | /* GetTempFileName requires that its output buffer (4th param) |
421 | have length MAX_PATH or greater. */ | |
422 | assert(size >= MAX_PATH); | |
423 | return (GetTempPath(MAX_PATH, temp_dir) | |
424 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
425 | ? 0 : -GetLastError()); | |
d5249393 | 426 | #else |
67b915a5 | 427 | int fd; |
7ccfb2eb | 428 | const char *tmpdir; |
0badc1ee AJ |
429 | tmpdir = getenv("TMPDIR"); |
430 | if (!tmpdir) | |
431 | tmpdir = "/tmp"; | |
eba25057 JM |
432 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
433 | return -EOVERFLOW; | |
434 | } | |
ea2384d3 | 435 | fd = mkstemp(filename); |
eba25057 JM |
436 | if (fd < 0 || close(fd)) { |
437 | return -errno; | |
438 | } | |
439 | return 0; | |
d5249393 | 440 | #endif |
eba25057 | 441 | } |
fc01f7e7 | 442 | |
84a12e66 CH |
443 | /* |
444 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
445 | * recognized as a host CDROM. | |
446 | */ | |
447 | static BlockDriver *find_hdev_driver(const char *filename) | |
448 | { | |
449 | int score_max = 0, score; | |
450 | BlockDriver *drv = NULL, *d; | |
451 | ||
452 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
453 | if (d->bdrv_probe_device) { | |
454 | score = d->bdrv_probe_device(filename); | |
455 | if (score > score_max) { | |
456 | score_max = score; | |
457 | drv = d; | |
458 | } | |
459 | } | |
460 | } | |
461 | ||
462 | return drv; | |
463 | } | |
464 | ||
b50cbabc | 465 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
466 | { |
467 | BlockDriver *drv1; | |
468 | char protocol[128]; | |
1cec71e3 | 469 | int len; |
83f64091 | 470 | const char *p; |
19cb3738 | 471 | |
66f82cee KW |
472 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
473 | ||
39508e7a CH |
474 | /* |
475 | * XXX(hch): we really should not let host device detection | |
476 | * override an explicit protocol specification, but moving this | |
477 | * later breaks access to device names with colons in them. | |
478 | * Thanks to the brain-dead persistent naming schemes on udev- | |
479 | * based Linux systems those actually are quite common. | |
480 | */ | |
481 | drv1 = find_hdev_driver(filename); | |
482 | if (drv1) { | |
483 | return drv1; | |
484 | } | |
485 | ||
9e0b22f4 | 486 | if (!path_has_protocol(filename)) { |
39508e7a | 487 | return bdrv_find_format("file"); |
84a12e66 | 488 | } |
9e0b22f4 SH |
489 | p = strchr(filename, ':'); |
490 | assert(p != NULL); | |
1cec71e3 AL |
491 | len = p - filename; |
492 | if (len > sizeof(protocol) - 1) | |
493 | len = sizeof(protocol) - 1; | |
494 | memcpy(protocol, filename, len); | |
495 | protocol[len] = '\0'; | |
8a22f02a | 496 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 497 | if (drv1->protocol_name && |
8a22f02a | 498 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 499 | return drv1; |
8a22f02a | 500 | } |
83f64091 FB |
501 | } |
502 | return NULL; | |
503 | } | |
504 | ||
c98ac35d | 505 | static int find_image_format(const char *filename, BlockDriver **pdrv) |
f3a5d3f8 CH |
506 | { |
507 | int ret, score, score_max; | |
508 | BlockDriver *drv1, *drv; | |
509 | uint8_t buf[2048]; | |
510 | BlockDriverState *bs; | |
511 | ||
f5edb014 | 512 | ret = bdrv_file_open(&bs, filename, 0); |
c98ac35d SW |
513 | if (ret < 0) { |
514 | *pdrv = NULL; | |
515 | return ret; | |
516 | } | |
f8ea0b00 | 517 | |
08a00559 KW |
518 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
519 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
1a396859 | 520 | bdrv_delete(bs); |
c98ac35d SW |
521 | drv = bdrv_find_format("raw"); |
522 | if (!drv) { | |
523 | ret = -ENOENT; | |
524 | } | |
525 | *pdrv = drv; | |
526 | return ret; | |
1a396859 | 527 | } |
f8ea0b00 | 528 | |
83f64091 FB |
529 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
530 | bdrv_delete(bs); | |
531 | if (ret < 0) { | |
c98ac35d SW |
532 | *pdrv = NULL; |
533 | return ret; | |
83f64091 FB |
534 | } |
535 | ||
ea2384d3 | 536 | score_max = 0; |
84a12e66 | 537 | drv = NULL; |
8a22f02a | 538 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
539 | if (drv1->bdrv_probe) { |
540 | score = drv1->bdrv_probe(buf, ret, filename); | |
541 | if (score > score_max) { | |
542 | score_max = score; | |
543 | drv = drv1; | |
544 | } | |
0849bf08 | 545 | } |
fc01f7e7 | 546 | } |
c98ac35d SW |
547 | if (!drv) { |
548 | ret = -ENOENT; | |
549 | } | |
550 | *pdrv = drv; | |
551 | return ret; | |
ea2384d3 FB |
552 | } |
553 | ||
51762288 SH |
554 | /** |
555 | * Set the current 'total_sectors' value | |
556 | */ | |
557 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
558 | { | |
559 | BlockDriver *drv = bs->drv; | |
560 | ||
396759ad NB |
561 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
562 | if (bs->sg) | |
563 | return 0; | |
564 | ||
51762288 SH |
565 | /* query actual device if possible, otherwise just trust the hint */ |
566 | if (drv->bdrv_getlength) { | |
567 | int64_t length = drv->bdrv_getlength(bs); | |
568 | if (length < 0) { | |
569 | return length; | |
570 | } | |
571 | hint = length >> BDRV_SECTOR_BITS; | |
572 | } | |
573 | ||
574 | bs->total_sectors = hint; | |
575 | return 0; | |
576 | } | |
577 | ||
c3993cdc SH |
578 | /** |
579 | * Set open flags for a given cache mode | |
580 | * | |
581 | * Return 0 on success, -1 if the cache mode was invalid. | |
582 | */ | |
583 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
584 | { | |
585 | *flags &= ~BDRV_O_CACHE_MASK; | |
586 | ||
587 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
588 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
589 | } else if (!strcmp(mode, "directsync")) { |
590 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
591 | } else if (!strcmp(mode, "writeback")) { |
592 | *flags |= BDRV_O_CACHE_WB; | |
593 | } else if (!strcmp(mode, "unsafe")) { | |
594 | *flags |= BDRV_O_CACHE_WB; | |
595 | *flags |= BDRV_O_NO_FLUSH; | |
596 | } else if (!strcmp(mode, "writethrough")) { | |
597 | /* this is the default */ | |
598 | } else { | |
599 | return -1; | |
600 | } | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
53fec9d3 SH |
605 | /** |
606 | * The copy-on-read flag is actually a reference count so multiple users may | |
607 | * use the feature without worrying about clobbering its previous state. | |
608 | * Copy-on-read stays enabled until all users have called to disable it. | |
609 | */ | |
610 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
611 | { | |
612 | bs->copy_on_read++; | |
613 | } | |
614 | ||
615 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
616 | { | |
617 | assert(bs->copy_on_read > 0); | |
618 | bs->copy_on_read--; | |
619 | } | |
620 | ||
57915332 KW |
621 | /* |
622 | * Common part for opening disk images and files | |
623 | */ | |
624 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
625 | int flags, BlockDriver *drv) | |
626 | { | |
627 | int ret, open_flags; | |
628 | ||
629 | assert(drv != NULL); | |
6405875c | 630 | assert(bs->file == NULL); |
57915332 | 631 | |
28dcee10 SH |
632 | trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
633 | ||
57915332 | 634 | bs->open_flags = flags; |
57915332 KW |
635 | bs->buffer_alignment = 512; |
636 | ||
53fec9d3 SH |
637 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
638 | if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) { | |
639 | bdrv_enable_copy_on_read(bs); | |
640 | } | |
641 | ||
57915332 KW |
642 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
643 | ||
644 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
645 | return -ENOTSUP; | |
646 | } | |
647 | ||
648 | bs->drv = drv; | |
7267c094 | 649 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 650 | |
03f541bd | 651 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e1e9b0ac | 652 | open_flags = flags | BDRV_O_CACHE_WB; |
57915332 KW |
653 | |
654 | /* | |
655 | * Clear flags that are internal to the block layer before opening the | |
656 | * image. | |
657 | */ | |
e1e9b0ac | 658 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
57915332 KW |
659 | |
660 | /* | |
ebabb67a | 661 | * Snapshots should be writable. |
57915332 KW |
662 | */ |
663 | if (bs->is_temporary) { | |
664 | open_flags |= BDRV_O_RDWR; | |
665 | } | |
666 | ||
e7c63796 SH |
667 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
668 | ||
66f82cee KW |
669 | /* Open the image, either directly or using a protocol */ |
670 | if (drv->bdrv_file_open) { | |
671 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
672 | } else { | |
673 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
674 | if (ret >= 0) { | |
675 | ret = drv->bdrv_open(bs, open_flags); | |
676 | } | |
677 | } | |
678 | ||
57915332 KW |
679 | if (ret < 0) { |
680 | goto free_and_fail; | |
681 | } | |
682 | ||
51762288 SH |
683 | ret = refresh_total_sectors(bs, bs->total_sectors); |
684 | if (ret < 0) { | |
685 | goto free_and_fail; | |
57915332 | 686 | } |
51762288 | 687 | |
57915332 KW |
688 | #ifndef _WIN32 |
689 | if (bs->is_temporary) { | |
690 | unlink(filename); | |
691 | } | |
692 | #endif | |
693 | return 0; | |
694 | ||
695 | free_and_fail: | |
66f82cee KW |
696 | if (bs->file) { |
697 | bdrv_delete(bs->file); | |
698 | bs->file = NULL; | |
699 | } | |
7267c094 | 700 | g_free(bs->opaque); |
57915332 KW |
701 | bs->opaque = NULL; |
702 | bs->drv = NULL; | |
703 | return ret; | |
704 | } | |
705 | ||
b6ce07aa KW |
706 | /* |
707 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
708 | */ | |
83f64091 | 709 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 710 | { |
83f64091 | 711 | BlockDriverState *bs; |
6db95603 | 712 | BlockDriver *drv; |
83f64091 FB |
713 | int ret; |
714 | ||
b50cbabc | 715 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
716 | if (!drv) { |
717 | return -ENOENT; | |
718 | } | |
719 | ||
83f64091 | 720 | bs = bdrv_new(""); |
b6ce07aa | 721 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
722 | if (ret < 0) { |
723 | bdrv_delete(bs); | |
724 | return ret; | |
3b0d4f61 | 725 | } |
71d0770c | 726 | bs->growable = 1; |
83f64091 FB |
727 | *pbs = bs; |
728 | return 0; | |
729 | } | |
730 | ||
b6ce07aa KW |
731 | /* |
732 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
733 | */ | |
d6e9098e KW |
734 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
735 | BlockDriver *drv) | |
ea2384d3 | 736 | { |
b6ce07aa | 737 | int ret; |
2b572816 | 738 | char tmp_filename[PATH_MAX]; |
712e7874 | 739 | |
83f64091 | 740 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
741 | BlockDriverState *bs1; |
742 | int64_t total_size; | |
7c96d46e | 743 | int is_protocol = 0; |
91a073a9 KW |
744 | BlockDriver *bdrv_qcow2; |
745 | QEMUOptionParameter *options; | |
b6ce07aa | 746 | char backing_filename[PATH_MAX]; |
3b46e624 | 747 | |
ea2384d3 FB |
748 | /* if snapshot, we create a temporary backing file and open it |
749 | instead of opening 'filename' directly */ | |
33e3963e | 750 | |
ea2384d3 FB |
751 | /* if there is a backing file, use it */ |
752 | bs1 = bdrv_new(""); | |
d6e9098e | 753 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 754 | if (ret < 0) { |
ea2384d3 | 755 | bdrv_delete(bs1); |
51d7c00c | 756 | return ret; |
ea2384d3 | 757 | } |
3e82990b | 758 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
759 | |
760 | if (bs1->drv && bs1->drv->protocol_name) | |
761 | is_protocol = 1; | |
762 | ||
ea2384d3 | 763 | bdrv_delete(bs1); |
3b46e624 | 764 | |
eba25057 JM |
765 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
766 | if (ret < 0) { | |
767 | return ret; | |
768 | } | |
7c96d46e AL |
769 | |
770 | /* Real path is meaningless for protocols */ | |
771 | if (is_protocol) | |
772 | snprintf(backing_filename, sizeof(backing_filename), | |
773 | "%s", filename); | |
114cdfa9 KS |
774 | else if (!realpath(filename, backing_filename)) |
775 | return -errno; | |
7c96d46e | 776 | |
91a073a9 KW |
777 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
778 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
779 | ||
3e82990b | 780 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
781 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
782 | if (drv) { | |
783 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
784 | drv->format_name); | |
785 | } | |
786 | ||
787 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 788 | free_option_parameters(options); |
51d7c00c AL |
789 | if (ret < 0) { |
790 | return ret; | |
ea2384d3 | 791 | } |
91a073a9 | 792 | |
ea2384d3 | 793 | filename = tmp_filename; |
91a073a9 | 794 | drv = bdrv_qcow2; |
ea2384d3 FB |
795 | bs->is_temporary = 1; |
796 | } | |
712e7874 | 797 | |
b6ce07aa | 798 | /* Find the right image format driver */ |
6db95603 | 799 | if (!drv) { |
c98ac35d | 800 | ret = find_image_format(filename, &drv); |
51d7c00c | 801 | } |
6987307c | 802 | |
51d7c00c | 803 | if (!drv) { |
51d7c00c | 804 | goto unlink_and_fail; |
ea2384d3 | 805 | } |
b6ce07aa KW |
806 | |
807 | /* Open the image */ | |
808 | ret = bdrv_open_common(bs, filename, flags, drv); | |
809 | if (ret < 0) { | |
6987307c CH |
810 | goto unlink_and_fail; |
811 | } | |
812 | ||
b6ce07aa KW |
813 | /* If there is a backing file, use it */ |
814 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
815 | char backing_filename[PATH_MAX]; | |
816 | int back_flags; | |
817 | BlockDriver *back_drv = NULL; | |
818 | ||
819 | bs->backing_hd = bdrv_new(""); | |
dc5a1371 PB |
820 | bdrv_get_full_backing_filename(bs, backing_filename, |
821 | sizeof(backing_filename)); | |
df2dbb4a SH |
822 | |
823 | if (bs->backing_format[0] != '\0') { | |
b6ce07aa | 824 | back_drv = bdrv_find_format(bs->backing_format); |
df2dbb4a | 825 | } |
b6ce07aa KW |
826 | |
827 | /* backing files always opened read-only */ | |
828 | back_flags = | |
829 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
830 | ||
831 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
832 | if (ret < 0) { | |
833 | bdrv_close(bs); | |
834 | return ret; | |
835 | } | |
836 | if (bs->is_temporary) { | |
837 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
838 | } else { | |
839 | /* base image inherits from "parent" */ | |
840 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
841 | } | |
842 | } | |
843 | ||
844 | if (!bdrv_key_required(bs)) { | |
7d4b4ba5 | 845 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
846 | } |
847 | ||
98f90dba ZYW |
848 | /* throttling disk I/O limits */ |
849 | if (bs->io_limits_enabled) { | |
850 | bdrv_io_limits_enable(bs); | |
851 | } | |
852 | ||
b6ce07aa KW |
853 | return 0; |
854 | ||
855 | unlink_and_fail: | |
856 | if (bs->is_temporary) { | |
857 | unlink(filename); | |
858 | } | |
859 | return ret; | |
860 | } | |
861 | ||
fc01f7e7 FB |
862 | void bdrv_close(BlockDriverState *bs) |
863 | { | |
80ccf93b | 864 | bdrv_flush(bs); |
19cb3738 | 865 | if (bs->drv) { |
3e914655 PB |
866 | if (bs->job) { |
867 | block_job_cancel_sync(bs->job); | |
868 | } | |
7094f12f KW |
869 | bdrv_drain_all(); |
870 | ||
f9092b10 MA |
871 | if (bs == bs_snapshots) { |
872 | bs_snapshots = NULL; | |
873 | } | |
557df6ac | 874 | if (bs->backing_hd) { |
ea2384d3 | 875 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
876 | bs->backing_hd = NULL; |
877 | } | |
ea2384d3 | 878 | bs->drv->bdrv_close(bs); |
7267c094 | 879 | g_free(bs->opaque); |
ea2384d3 FB |
880 | #ifdef _WIN32 |
881 | if (bs->is_temporary) { | |
882 | unlink(bs->filename); | |
883 | } | |
67b915a5 | 884 | #endif |
ea2384d3 FB |
885 | bs->opaque = NULL; |
886 | bs->drv = NULL; | |
53fec9d3 | 887 | bs->copy_on_read = 0; |
a275fa42 PB |
888 | bs->backing_file[0] = '\0'; |
889 | bs->backing_format[0] = '\0'; | |
6405875c PB |
890 | bs->total_sectors = 0; |
891 | bs->encrypted = 0; | |
892 | bs->valid_key = 0; | |
893 | bs->sg = 0; | |
894 | bs->growable = 0; | |
b338082b | 895 | |
66f82cee | 896 | if (bs->file != NULL) { |
0ac9377d PB |
897 | bdrv_delete(bs->file); |
898 | bs->file = NULL; | |
66f82cee KW |
899 | } |
900 | ||
7d4b4ba5 | 901 | bdrv_dev_change_media_cb(bs, false); |
b338082b | 902 | } |
98f90dba ZYW |
903 | |
904 | /*throttling disk I/O limits*/ | |
905 | if (bs->io_limits_enabled) { | |
906 | bdrv_io_limits_disable(bs); | |
907 | } | |
b338082b FB |
908 | } |
909 | ||
2bc93fed MK |
910 | void bdrv_close_all(void) |
911 | { | |
912 | BlockDriverState *bs; | |
913 | ||
914 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
915 | bdrv_close(bs); | |
916 | } | |
917 | } | |
918 | ||
922453bc SH |
919 | /* |
920 | * Wait for pending requests to complete across all BlockDriverStates | |
921 | * | |
922 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
923 | * after calling this function. | |
4c355d53 ZYW |
924 | * |
925 | * Note that completion of an asynchronous I/O operation can trigger any | |
926 | * number of other I/O operations on other devices---for example a coroutine | |
927 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
928 | * coroutine is complete. Because of this, it is not possible to have a | |
929 | * function to drain a single device's I/O queue. | |
922453bc SH |
930 | */ |
931 | void bdrv_drain_all(void) | |
932 | { | |
933 | BlockDriverState *bs; | |
4c355d53 ZYW |
934 | bool busy; |
935 | ||
936 | do { | |
937 | busy = qemu_aio_wait(); | |
922453bc | 938 | |
4c355d53 ZYW |
939 | /* FIXME: We do not have timer support here, so this is effectively |
940 | * a busy wait. | |
941 | */ | |
942 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
943 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
944 | qemu_co_queue_restart_all(&bs->throttled_reqs); | |
945 | busy = true; | |
946 | } | |
947 | } | |
948 | } while (busy); | |
922453bc SH |
949 | |
950 | /* If requests are still pending there is a bug somewhere */ | |
951 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
952 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
953 | assert(qemu_co_queue_empty(&bs->throttled_reqs)); | |
954 | } | |
955 | } | |
956 | ||
d22b2f41 RH |
957 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
958 | Also, NULL terminate the device_name to prevent double remove */ | |
959 | void bdrv_make_anon(BlockDriverState *bs) | |
960 | { | |
961 | if (bs->device_name[0] != '\0') { | |
962 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
963 | } | |
964 | bs->device_name[0] = '\0'; | |
965 | } | |
966 | ||
e023b2e2 PB |
967 | static void bdrv_rebind(BlockDriverState *bs) |
968 | { | |
969 | if (bs->drv && bs->drv->bdrv_rebind) { | |
970 | bs->drv->bdrv_rebind(bs); | |
971 | } | |
972 | } | |
973 | ||
8802d1fd JC |
974 | /* |
975 | * Add new bs contents at the top of an image chain while the chain is | |
976 | * live, while keeping required fields on the top layer. | |
977 | * | |
978 | * This will modify the BlockDriverState fields, and swap contents | |
979 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
980 | * | |
f6801b83 JC |
981 | * bs_new is required to be anonymous. |
982 | * | |
8802d1fd JC |
983 | * This function does not create any image files. |
984 | */ | |
985 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
986 | { | |
987 | BlockDriverState tmp; | |
988 | ||
f6801b83 JC |
989 | /* bs_new must be anonymous */ |
990 | assert(bs_new->device_name[0] == '\0'); | |
8802d1fd JC |
991 | |
992 | tmp = *bs_new; | |
993 | ||
994 | /* there are some fields that need to stay on the top layer: */ | |
3a389e79 | 995 | tmp.open_flags = bs_top->open_flags; |
8802d1fd JC |
996 | |
997 | /* dev info */ | |
998 | tmp.dev_ops = bs_top->dev_ops; | |
999 | tmp.dev_opaque = bs_top->dev_opaque; | |
1000 | tmp.dev = bs_top->dev; | |
1001 | tmp.buffer_alignment = bs_top->buffer_alignment; | |
1002 | tmp.copy_on_read = bs_top->copy_on_read; | |
1003 | ||
c4a248a1 PB |
1004 | tmp.enable_write_cache = bs_top->enable_write_cache; |
1005 | ||
8802d1fd JC |
1006 | /* i/o timing parameters */ |
1007 | tmp.slice_time = bs_top->slice_time; | |
1008 | tmp.slice_start = bs_top->slice_start; | |
1009 | tmp.slice_end = bs_top->slice_end; | |
1010 | tmp.io_limits = bs_top->io_limits; | |
1011 | tmp.io_base = bs_top->io_base; | |
1012 | tmp.throttled_reqs = bs_top->throttled_reqs; | |
1013 | tmp.block_timer = bs_top->block_timer; | |
1014 | tmp.io_limits_enabled = bs_top->io_limits_enabled; | |
1015 | ||
1016 | /* geometry */ | |
1017 | tmp.cyls = bs_top->cyls; | |
1018 | tmp.heads = bs_top->heads; | |
1019 | tmp.secs = bs_top->secs; | |
1020 | tmp.translation = bs_top->translation; | |
1021 | ||
1022 | /* r/w error */ | |
1023 | tmp.on_read_error = bs_top->on_read_error; | |
1024 | tmp.on_write_error = bs_top->on_write_error; | |
1025 | ||
1026 | /* i/o status */ | |
1027 | tmp.iostatus_enabled = bs_top->iostatus_enabled; | |
1028 | tmp.iostatus = bs_top->iostatus; | |
1029 | ||
1030 | /* keep the same entry in bdrv_states */ | |
1031 | pstrcpy(tmp.device_name, sizeof(tmp.device_name), bs_top->device_name); | |
1032 | tmp.list = bs_top->list; | |
1033 | ||
1034 | /* The contents of 'tmp' will become bs_top, as we are | |
1035 | * swapping bs_new and bs_top contents. */ | |
1036 | tmp.backing_hd = bs_new; | |
1037 | pstrcpy(tmp.backing_file, sizeof(tmp.backing_file), bs_top->filename); | |
f6801b83 | 1038 | bdrv_get_format(bs_top, tmp.backing_format, sizeof(tmp.backing_format)); |
8802d1fd JC |
1039 | |
1040 | /* swap contents of the fixed new bs and the current top */ | |
1041 | *bs_new = *bs_top; | |
1042 | *bs_top = tmp; | |
1043 | ||
f6801b83 JC |
1044 | /* device_name[] was carried over from the old bs_top. bs_new |
1045 | * shouldn't be in bdrv_states, so we need to make device_name[] | |
1046 | * reflect the anonymity of bs_new | |
1047 | */ | |
1048 | bs_new->device_name[0] = '\0'; | |
1049 | ||
8802d1fd JC |
1050 | /* clear the copied fields in the new backing file */ |
1051 | bdrv_detach_dev(bs_new, bs_new->dev); | |
1052 | ||
1053 | qemu_co_queue_init(&bs_new->throttled_reqs); | |
1054 | memset(&bs_new->io_base, 0, sizeof(bs_new->io_base)); | |
1055 | memset(&bs_new->io_limits, 0, sizeof(bs_new->io_limits)); | |
1056 | bdrv_iostatus_disable(bs_new); | |
1057 | ||
1058 | /* we don't use bdrv_io_limits_disable() for this, because we don't want | |
1059 | * to affect or delete the block_timer, as it has been moved to bs_top */ | |
1060 | bs_new->io_limits_enabled = false; | |
1061 | bs_new->block_timer = NULL; | |
1062 | bs_new->slice_time = 0; | |
1063 | bs_new->slice_start = 0; | |
1064 | bs_new->slice_end = 0; | |
e023b2e2 PB |
1065 | |
1066 | bdrv_rebind(bs_new); | |
1067 | bdrv_rebind(bs_top); | |
8802d1fd JC |
1068 | } |
1069 | ||
b338082b FB |
1070 | void bdrv_delete(BlockDriverState *bs) |
1071 | { | |
fa879d62 | 1072 | assert(!bs->dev); |
3e914655 PB |
1073 | assert(!bs->job); |
1074 | assert(!bs->in_use); | |
18846dee | 1075 | |
1b7bdbc1 | 1076 | /* remove from list, if necessary */ |
d22b2f41 | 1077 | bdrv_make_anon(bs); |
34c6f050 | 1078 | |
b338082b | 1079 | bdrv_close(bs); |
66f82cee | 1080 | |
f9092b10 | 1081 | assert(bs != bs_snapshots); |
7267c094 | 1082 | g_free(bs); |
fc01f7e7 FB |
1083 | } |
1084 | ||
fa879d62 MA |
1085 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1086 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1087 | { |
fa879d62 | 1088 | if (bs->dev) { |
18846dee MA |
1089 | return -EBUSY; |
1090 | } | |
fa879d62 | 1091 | bs->dev = dev; |
28a7282a | 1092 | bdrv_iostatus_reset(bs); |
18846dee MA |
1093 | return 0; |
1094 | } | |
1095 | ||
fa879d62 MA |
1096 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1097 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1098 | { |
fa879d62 MA |
1099 | if (bdrv_attach_dev(bs, dev) < 0) { |
1100 | abort(); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1105 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1106 | { | |
1107 | assert(bs->dev == dev); | |
1108 | bs->dev = NULL; | |
0e49de52 MA |
1109 | bs->dev_ops = NULL; |
1110 | bs->dev_opaque = NULL; | |
29e05f20 | 1111 | bs->buffer_alignment = 512; |
18846dee MA |
1112 | } |
1113 | ||
fa879d62 MA |
1114 | /* TODO change to return DeviceState * when all users are qdevified */ |
1115 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1116 | { |
fa879d62 | 1117 | return bs->dev; |
18846dee MA |
1118 | } |
1119 | ||
0e49de52 MA |
1120 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1121 | void *opaque) | |
1122 | { | |
1123 | bs->dev_ops = ops; | |
1124 | bs->dev_opaque = opaque; | |
2c6942fa MA |
1125 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
1126 | bs_snapshots = NULL; | |
1127 | } | |
0e49de52 MA |
1128 | } |
1129 | ||
329c0a48 LC |
1130 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1131 | BlockQMPEventAction action, int is_read) | |
1132 | { | |
1133 | QObject *data; | |
1134 | const char *action_str; | |
1135 | ||
1136 | switch (action) { | |
1137 | case BDRV_ACTION_REPORT: | |
1138 | action_str = "report"; | |
1139 | break; | |
1140 | case BDRV_ACTION_IGNORE: | |
1141 | action_str = "ignore"; | |
1142 | break; | |
1143 | case BDRV_ACTION_STOP: | |
1144 | action_str = "stop"; | |
1145 | break; | |
1146 | default: | |
1147 | abort(); | |
1148 | } | |
1149 | ||
1150 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1151 | bdrv->device_name, | |
1152 | action_str, | |
1153 | is_read ? "read" : "write"); | |
1154 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1155 | ||
1156 | qobject_decref(data); | |
1157 | } | |
1158 | ||
6f382ed2 LC |
1159 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1160 | { | |
1161 | QObject *data; | |
1162 | ||
1163 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1164 | bdrv_get_device_name(bs), ejected); | |
1165 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1166 | ||
1167 | qobject_decref(data); | |
1168 | } | |
1169 | ||
7d4b4ba5 | 1170 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1171 | { |
145feb17 | 1172 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1173 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1174 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1175 | if (tray_was_closed) { |
1176 | /* tray open */ | |
1177 | bdrv_emit_qmp_eject_event(bs, true); | |
1178 | } | |
1179 | if (load) { | |
1180 | /* tray close */ | |
1181 | bdrv_emit_qmp_eject_event(bs, false); | |
1182 | } | |
145feb17 MA |
1183 | } |
1184 | } | |
1185 | ||
2c6942fa MA |
1186 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1187 | { | |
1188 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1189 | } | |
1190 | ||
025ccaa7 PB |
1191 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1192 | { | |
1193 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1194 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1195 | } | |
1196 | } | |
1197 | ||
e4def80b MA |
1198 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1199 | { | |
1200 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1201 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1202 | } | |
1203 | return false; | |
1204 | } | |
1205 | ||
145feb17 MA |
1206 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1207 | { | |
1208 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1209 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1210 | } |
1211 | } | |
1212 | ||
f107639a MA |
1213 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1214 | { | |
1215 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1216 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1217 | } | |
1218 | return false; | |
1219 | } | |
1220 | ||
e97fc193 AL |
1221 | /* |
1222 | * Run consistency checks on an image | |
1223 | * | |
e076f338 | 1224 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1225 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1226 | * check are stored in res. |
e97fc193 | 1227 | */ |
4534ff54 | 1228 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1229 | { |
1230 | if (bs->drv->bdrv_check == NULL) { | |
1231 | return -ENOTSUP; | |
1232 | } | |
1233 | ||
e076f338 | 1234 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1235 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1236 | } |
1237 | ||
8a426614 KW |
1238 | #define COMMIT_BUF_SECTORS 2048 |
1239 | ||
33e3963e FB |
1240 | /* commit COW file into the raw image */ |
1241 | int bdrv_commit(BlockDriverState *bs) | |
1242 | { | |
19cb3738 | 1243 | BlockDriver *drv = bs->drv; |
ee181196 | 1244 | BlockDriver *backing_drv; |
8a426614 KW |
1245 | int64_t sector, total_sectors; |
1246 | int n, ro, open_flags; | |
4dca4b63 | 1247 | int ret = 0, rw_ret = 0; |
8a426614 | 1248 | uint8_t *buf; |
4dca4b63 NS |
1249 | char filename[1024]; |
1250 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 1251 | |
19cb3738 FB |
1252 | if (!drv) |
1253 | return -ENOMEDIUM; | |
4dca4b63 NS |
1254 | |
1255 | if (!bs->backing_hd) { | |
1256 | return -ENOTSUP; | |
33e3963e FB |
1257 | } |
1258 | ||
4dca4b63 NS |
1259 | if (bs->backing_hd->keep_read_only) { |
1260 | return -EACCES; | |
1261 | } | |
ee181196 | 1262 | |
2d3735d3 SH |
1263 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1264 | return -EBUSY; | |
1265 | } | |
1266 | ||
ee181196 | 1267 | backing_drv = bs->backing_hd->drv; |
4dca4b63 NS |
1268 | ro = bs->backing_hd->read_only; |
1269 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
1270 | open_flags = bs->backing_hd->open_flags; | |
1271 | ||
1272 | if (ro) { | |
1273 | /* re-open as RW */ | |
1274 | bdrv_delete(bs->backing_hd); | |
1275 | bs->backing_hd = NULL; | |
1276 | bs_rw = bdrv_new(""); | |
ee181196 KW |
1277 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
1278 | backing_drv); | |
4dca4b63 NS |
1279 | if (rw_ret < 0) { |
1280 | bdrv_delete(bs_rw); | |
1281 | /* try to re-open read-only */ | |
1282 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1283 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1284 | backing_drv); | |
4dca4b63 NS |
1285 | if (ret < 0) { |
1286 | bdrv_delete(bs_ro); | |
1287 | /* drive not functional anymore */ | |
1288 | bs->drv = NULL; | |
1289 | return ret; | |
1290 | } | |
1291 | bs->backing_hd = bs_ro; | |
1292 | return rw_ret; | |
1293 | } | |
1294 | bs->backing_hd = bs_rw; | |
ea2384d3 | 1295 | } |
33e3963e | 1296 | |
6ea44308 | 1297 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1298 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1299 | |
1300 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1301 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1302 | |
1303 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1304 | ret = -EIO; | |
1305 | goto ro_cleanup; | |
1306 | } | |
1307 | ||
1308 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1309 | ret = -EIO; | |
1310 | goto ro_cleanup; | |
1311 | } | |
ea2384d3 | 1312 | } |
33e3963e | 1313 | } |
95389c86 | 1314 | |
1d44952f CH |
1315 | if (drv->bdrv_make_empty) { |
1316 | ret = drv->bdrv_make_empty(bs); | |
1317 | bdrv_flush(bs); | |
1318 | } | |
95389c86 | 1319 | |
3f5075ae CH |
1320 | /* |
1321 | * Make sure all data we wrote to the backing device is actually | |
1322 | * stable on disk. | |
1323 | */ | |
1324 | if (bs->backing_hd) | |
1325 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1326 | |
1327 | ro_cleanup: | |
7267c094 | 1328 | g_free(buf); |
4dca4b63 NS |
1329 | |
1330 | if (ro) { | |
1331 | /* re-open as RO */ | |
1332 | bdrv_delete(bs->backing_hd); | |
1333 | bs->backing_hd = NULL; | |
1334 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1335 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1336 | backing_drv); | |
4dca4b63 NS |
1337 | if (ret < 0) { |
1338 | bdrv_delete(bs_ro); | |
1339 | /* drive not functional anymore */ | |
1340 | bs->drv = NULL; | |
1341 | return ret; | |
1342 | } | |
1343 | bs->backing_hd = bs_ro; | |
1344 | bs->backing_hd->keep_read_only = 0; | |
1345 | } | |
1346 | ||
1d44952f | 1347 | return ret; |
33e3963e FB |
1348 | } |
1349 | ||
e8877497 | 1350 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1351 | { |
1352 | BlockDriverState *bs; | |
1353 | ||
1354 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
e8877497 SH |
1355 | int ret = bdrv_commit(bs); |
1356 | if (ret < 0) { | |
1357 | return ret; | |
1358 | } | |
6ab4b5ab | 1359 | } |
e8877497 | 1360 | return 0; |
6ab4b5ab MA |
1361 | } |
1362 | ||
dbffbdcf SH |
1363 | struct BdrvTrackedRequest { |
1364 | BlockDriverState *bs; | |
1365 | int64_t sector_num; | |
1366 | int nb_sectors; | |
1367 | bool is_write; | |
1368 | QLIST_ENTRY(BdrvTrackedRequest) list; | |
5f8b6491 | 1369 | Coroutine *co; /* owner, used for deadlock detection */ |
f4658285 | 1370 | CoQueue wait_queue; /* coroutines blocked on this request */ |
dbffbdcf SH |
1371 | }; |
1372 | ||
1373 | /** | |
1374 | * Remove an active request from the tracked requests list | |
1375 | * | |
1376 | * This function should be called when a tracked request is completing. | |
1377 | */ | |
1378 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1379 | { | |
1380 | QLIST_REMOVE(req, list); | |
f4658285 | 1381 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1382 | } |
1383 | ||
1384 | /** | |
1385 | * Add an active request to the tracked requests list | |
1386 | */ | |
1387 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1388 | BlockDriverState *bs, | |
1389 | int64_t sector_num, | |
1390 | int nb_sectors, bool is_write) | |
1391 | { | |
1392 | *req = (BdrvTrackedRequest){ | |
1393 | .bs = bs, | |
1394 | .sector_num = sector_num, | |
1395 | .nb_sectors = nb_sectors, | |
1396 | .is_write = is_write, | |
5f8b6491 | 1397 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1398 | }; |
1399 | ||
f4658285 SH |
1400 | qemu_co_queue_init(&req->wait_queue); |
1401 | ||
dbffbdcf SH |
1402 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1403 | } | |
1404 | ||
d83947ac SH |
1405 | /** |
1406 | * Round a region to cluster boundaries | |
1407 | */ | |
1408 | static void round_to_clusters(BlockDriverState *bs, | |
1409 | int64_t sector_num, int nb_sectors, | |
1410 | int64_t *cluster_sector_num, | |
1411 | int *cluster_nb_sectors) | |
1412 | { | |
1413 | BlockDriverInfo bdi; | |
1414 | ||
1415 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1416 | *cluster_sector_num = sector_num; | |
1417 | *cluster_nb_sectors = nb_sectors; | |
1418 | } else { | |
1419 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1420 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1421 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1422 | nb_sectors, c); | |
1423 | } | |
1424 | } | |
1425 | ||
f4658285 SH |
1426 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1427 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1428 | /* aaaa bbbb */ |
1429 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1430 | return false; | |
1431 | } | |
1432 | /* bbbb aaaa */ | |
1433 | if (req->sector_num >= sector_num + nb_sectors) { | |
1434 | return false; | |
1435 | } | |
1436 | return true; | |
f4658285 SH |
1437 | } |
1438 | ||
1439 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1440 | int64_t sector_num, int nb_sectors) | |
1441 | { | |
1442 | BdrvTrackedRequest *req; | |
d83947ac SH |
1443 | int64_t cluster_sector_num; |
1444 | int cluster_nb_sectors; | |
f4658285 SH |
1445 | bool retry; |
1446 | ||
d83947ac SH |
1447 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1448 | * that allocating writes will be serialized and not race with each other | |
1449 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1450 | * CoR read and write operations are atomic and guest writes cannot | |
1451 | * interleave between them. | |
1452 | */ | |
1453 | round_to_clusters(bs, sector_num, nb_sectors, | |
1454 | &cluster_sector_num, &cluster_nb_sectors); | |
1455 | ||
f4658285 SH |
1456 | do { |
1457 | retry = false; | |
1458 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1459 | if (tracked_request_overlaps(req, cluster_sector_num, |
1460 | cluster_nb_sectors)) { | |
5f8b6491 SH |
1461 | /* Hitting this means there was a reentrant request, for |
1462 | * example, a block driver issuing nested requests. This must | |
1463 | * never happen since it means deadlock. | |
1464 | */ | |
1465 | assert(qemu_coroutine_self() != req->co); | |
1466 | ||
f4658285 SH |
1467 | qemu_co_queue_wait(&req->wait_queue); |
1468 | retry = true; | |
1469 | break; | |
1470 | } | |
1471 | } | |
1472 | } while (retry); | |
1473 | } | |
1474 | ||
756e6736 KW |
1475 | /* |
1476 | * Return values: | |
1477 | * 0 - success | |
1478 | * -EINVAL - backing format specified, but no file | |
1479 | * -ENOSPC - can't update the backing file because no space is left in the | |
1480 | * image file header | |
1481 | * -ENOTSUP - format driver doesn't support changing the backing file | |
1482 | */ | |
1483 | int bdrv_change_backing_file(BlockDriverState *bs, | |
1484 | const char *backing_file, const char *backing_fmt) | |
1485 | { | |
1486 | BlockDriver *drv = bs->drv; | |
469ef350 | 1487 | int ret; |
756e6736 | 1488 | |
5f377794 PB |
1489 | /* Backing file format doesn't make sense without a backing file */ |
1490 | if (backing_fmt && !backing_file) { | |
1491 | return -EINVAL; | |
1492 | } | |
1493 | ||
756e6736 | 1494 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 1495 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 1496 | } else { |
469ef350 | 1497 | ret = -ENOTSUP; |
756e6736 | 1498 | } |
469ef350 PB |
1499 | |
1500 | if (ret == 0) { | |
1501 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
1502 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1503 | } | |
1504 | return ret; | |
756e6736 KW |
1505 | } |
1506 | ||
71d0770c AL |
1507 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1508 | size_t size) | |
1509 | { | |
1510 | int64_t len; | |
1511 | ||
1512 | if (!bdrv_is_inserted(bs)) | |
1513 | return -ENOMEDIUM; | |
1514 | ||
1515 | if (bs->growable) | |
1516 | return 0; | |
1517 | ||
1518 | len = bdrv_getlength(bs); | |
1519 | ||
fbb7b4e0 KW |
1520 | if (offset < 0) |
1521 | return -EIO; | |
1522 | ||
1523 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
1524 | return -EIO; |
1525 | ||
1526 | return 0; | |
1527 | } | |
1528 | ||
1529 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
1530 | int nb_sectors) | |
1531 | { | |
eb5a3165 JS |
1532 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
1533 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
1534 | } |
1535 | ||
1c9805a3 SH |
1536 | typedef struct RwCo { |
1537 | BlockDriverState *bs; | |
1538 | int64_t sector_num; | |
1539 | int nb_sectors; | |
1540 | QEMUIOVector *qiov; | |
1541 | bool is_write; | |
1542 | int ret; | |
1543 | } RwCo; | |
1544 | ||
1545 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 1546 | { |
1c9805a3 | 1547 | RwCo *rwco = opaque; |
ea2384d3 | 1548 | |
1c9805a3 SH |
1549 | if (!rwco->is_write) { |
1550 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
470c0504 | 1551 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1552 | } else { |
1553 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
f08f2dda | 1554 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1555 | } |
1556 | } | |
e7a8a783 | 1557 | |
1c9805a3 SH |
1558 | /* |
1559 | * Process a synchronous request using coroutines | |
1560 | */ | |
1561 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
1562 | int nb_sectors, bool is_write) | |
1563 | { | |
1564 | QEMUIOVector qiov; | |
1565 | struct iovec iov = { | |
1566 | .iov_base = (void *)buf, | |
1567 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1568 | }; | |
1569 | Coroutine *co; | |
1570 | RwCo rwco = { | |
1571 | .bs = bs, | |
1572 | .sector_num = sector_num, | |
1573 | .nb_sectors = nb_sectors, | |
1574 | .qiov = &qiov, | |
1575 | .is_write = is_write, | |
1576 | .ret = NOT_DONE, | |
1577 | }; | |
e7a8a783 | 1578 | |
1c9805a3 | 1579 | qemu_iovec_init_external(&qiov, &iov, 1); |
e7a8a783 | 1580 | |
498e386c ZYW |
1581 | /** |
1582 | * In sync call context, when the vcpu is blocked, this throttling timer | |
1583 | * will not fire; so the I/O throttling function has to be disabled here | |
1584 | * if it has been enabled. | |
1585 | */ | |
1586 | if (bs->io_limits_enabled) { | |
1587 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
1588 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
1589 | bdrv_io_limits_disable(bs); | |
1590 | } | |
1591 | ||
1c9805a3 SH |
1592 | if (qemu_in_coroutine()) { |
1593 | /* Fast-path if already in coroutine context */ | |
1594 | bdrv_rw_co_entry(&rwco); | |
1595 | } else { | |
1596 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
1597 | qemu_coroutine_enter(co, &rwco); | |
1598 | while (rwco.ret == NOT_DONE) { | |
1599 | qemu_aio_wait(); | |
1600 | } | |
1601 | } | |
1602 | return rwco.ret; | |
1603 | } | |
b338082b | 1604 | |
1c9805a3 SH |
1605 | /* return < 0 if error. See bdrv_write() for the return codes */ |
1606 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
1607 | uint8_t *buf, int nb_sectors) | |
1608 | { | |
1609 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
fc01f7e7 FB |
1610 | } |
1611 | ||
71df14fc PB |
1612 | #define BITS_PER_LONG (sizeof(unsigned long) * 8) |
1613 | ||
7cd1e32a | 1614 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 1615 | int nb_sectors, int dirty) |
7cd1e32a | 1616 | { |
1617 | int64_t start, end; | |
c6d22830 | 1618 | unsigned long val, idx, bit; |
a55eb92c | 1619 | |
6ea44308 | 1620 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 1621 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
1622 | |
1623 | for (; start <= end; start++) { | |
71df14fc PB |
1624 | idx = start / BITS_PER_LONG; |
1625 | bit = start % BITS_PER_LONG; | |
c6d22830 JK |
1626 | val = bs->dirty_bitmap[idx]; |
1627 | if (dirty) { | |
6d59fec1 | 1628 | if (!(val & (1UL << bit))) { |
aaa0eb75 | 1629 | bs->dirty_count++; |
6d59fec1 | 1630 | val |= 1UL << bit; |
aaa0eb75 | 1631 | } |
c6d22830 | 1632 | } else { |
6d59fec1 | 1633 | if (val & (1UL << bit)) { |
aaa0eb75 | 1634 | bs->dirty_count--; |
6d59fec1 | 1635 | val &= ~(1UL << bit); |
aaa0eb75 | 1636 | } |
c6d22830 JK |
1637 | } |
1638 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 1639 | } |
1640 | } | |
1641 | ||
5fafdf24 | 1642 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
1643 | -EIO generic I/O error (may happen for all errors) |
1644 | -ENOMEDIUM No media inserted. | |
1645 | -EINVAL Invalid sector number or nb_sectors | |
1646 | -EACCES Trying to write a read-only device | |
1647 | */ | |
5fafdf24 | 1648 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
1649 | const uint8_t *buf, int nb_sectors) |
1650 | { | |
1c9805a3 | 1651 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
83f64091 FB |
1652 | } |
1653 | ||
eda578e5 AL |
1654 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
1655 | void *buf, int count1) | |
83f64091 | 1656 | { |
6ea44308 | 1657 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1658 | int len, nb_sectors, count; |
1659 | int64_t sector_num; | |
9a8c4cce | 1660 | int ret; |
83f64091 FB |
1661 | |
1662 | count = count1; | |
1663 | /* first read to align to sector start */ | |
6ea44308 | 1664 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1665 | if (len > count) |
1666 | len = count; | |
6ea44308 | 1667 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1668 | if (len > 0) { |
9a8c4cce KW |
1669 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1670 | return ret; | |
6ea44308 | 1671 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
1672 | count -= len; |
1673 | if (count == 0) | |
1674 | return count1; | |
1675 | sector_num++; | |
1676 | buf += len; | |
1677 | } | |
1678 | ||
1679 | /* read the sectors "in place" */ | |
6ea44308 | 1680 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1681 | if (nb_sectors > 0) { |
9a8c4cce KW |
1682 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1683 | return ret; | |
83f64091 | 1684 | sector_num += nb_sectors; |
6ea44308 | 1685 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1686 | buf += len; |
1687 | count -= len; | |
1688 | } | |
1689 | ||
1690 | /* add data from the last sector */ | |
1691 | if (count > 0) { | |
9a8c4cce KW |
1692 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1693 | return ret; | |
83f64091 FB |
1694 | memcpy(buf, tmp_buf, count); |
1695 | } | |
1696 | return count1; | |
1697 | } | |
1698 | ||
eda578e5 AL |
1699 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
1700 | const void *buf, int count1) | |
83f64091 | 1701 | { |
6ea44308 | 1702 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1703 | int len, nb_sectors, count; |
1704 | int64_t sector_num; | |
9a8c4cce | 1705 | int ret; |
83f64091 FB |
1706 | |
1707 | count = count1; | |
1708 | /* first write to align to sector start */ | |
6ea44308 | 1709 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1710 | if (len > count) |
1711 | len = count; | |
6ea44308 | 1712 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1713 | if (len > 0) { |
9a8c4cce KW |
1714 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1715 | return ret; | |
6ea44308 | 1716 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1717 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1718 | return ret; | |
83f64091 FB |
1719 | count -= len; |
1720 | if (count == 0) | |
1721 | return count1; | |
1722 | sector_num++; | |
1723 | buf += len; | |
1724 | } | |
1725 | ||
1726 | /* write the sectors "in place" */ | |
6ea44308 | 1727 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1728 | if (nb_sectors > 0) { |
9a8c4cce KW |
1729 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1730 | return ret; | |
83f64091 | 1731 | sector_num += nb_sectors; |
6ea44308 | 1732 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1733 | buf += len; |
1734 | count -= len; | |
1735 | } | |
1736 | ||
1737 | /* add data from the last sector */ | |
1738 | if (count > 0) { | |
9a8c4cce KW |
1739 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1740 | return ret; | |
83f64091 | 1741 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1742 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1743 | return ret; | |
83f64091 FB |
1744 | } |
1745 | return count1; | |
1746 | } | |
83f64091 | 1747 | |
f08145fe KW |
1748 | /* |
1749 | * Writes to the file and ensures that no writes are reordered across this | |
1750 | * request (acts as a barrier) | |
1751 | * | |
1752 | * Returns 0 on success, -errno in error cases. | |
1753 | */ | |
1754 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1755 | const void *buf, int count) | |
1756 | { | |
1757 | int ret; | |
1758 | ||
1759 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1760 | if (ret < 0) { | |
1761 | return ret; | |
1762 | } | |
1763 | ||
f05fa4ad PB |
1764 | /* No flush needed for cache modes that already do it */ |
1765 | if (bs->enable_write_cache) { | |
f08145fe KW |
1766 | bdrv_flush(bs); |
1767 | } | |
1768 | ||
1769 | return 0; | |
1770 | } | |
1771 | ||
470c0504 | 1772 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
1773 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
1774 | { | |
1775 | /* Perform I/O through a temporary buffer so that users who scribble over | |
1776 | * their read buffer while the operation is in progress do not end up | |
1777 | * modifying the image file. This is critical for zero-copy guest I/O | |
1778 | * where anything might happen inside guest memory. | |
1779 | */ | |
1780 | void *bounce_buffer; | |
1781 | ||
79c053bd | 1782 | BlockDriver *drv = bs->drv; |
ab185921 SH |
1783 | struct iovec iov; |
1784 | QEMUIOVector bounce_qiov; | |
1785 | int64_t cluster_sector_num; | |
1786 | int cluster_nb_sectors; | |
1787 | size_t skip_bytes; | |
1788 | int ret; | |
1789 | ||
1790 | /* Cover entire cluster so no additional backing file I/O is required when | |
1791 | * allocating cluster in the image file. | |
1792 | */ | |
1793 | round_to_clusters(bs, sector_num, nb_sectors, | |
1794 | &cluster_sector_num, &cluster_nb_sectors); | |
1795 | ||
470c0504 SH |
1796 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
1797 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
1798 | |
1799 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
1800 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
1801 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
1802 | ||
79c053bd SH |
1803 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
1804 | &bounce_qiov); | |
ab185921 SH |
1805 | if (ret < 0) { |
1806 | goto err; | |
1807 | } | |
1808 | ||
79c053bd SH |
1809 | if (drv->bdrv_co_write_zeroes && |
1810 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
1811 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
1812 | cluster_nb_sectors); | |
79c053bd | 1813 | } else { |
f05fa4ad PB |
1814 | /* This does not change the data on the disk, it is not necessary |
1815 | * to flush even in cache=writethrough mode. | |
1816 | */ | |
79c053bd | 1817 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 1818 | &bounce_qiov); |
79c053bd SH |
1819 | } |
1820 | ||
ab185921 SH |
1821 | if (ret < 0) { |
1822 | /* It might be okay to ignore write errors for guest requests. If this | |
1823 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
1824 | * Simply report it in all cases. | |
1825 | */ | |
1826 | goto err; | |
1827 | } | |
1828 | ||
1829 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
1830 | qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, | |
1831 | nb_sectors * BDRV_SECTOR_SIZE); | |
1832 | ||
1833 | err: | |
1834 | qemu_vfree(bounce_buffer); | |
1835 | return ret; | |
1836 | } | |
1837 | ||
c5fbe571 SH |
1838 | /* |
1839 | * Handle a read request in coroutine context | |
1840 | */ | |
1841 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
1842 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
1843 | BdrvRequestFlags flags) | |
da1fa91d KW |
1844 | { |
1845 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
1846 | BdrvTrackedRequest req; |
1847 | int ret; | |
da1fa91d | 1848 | |
da1fa91d KW |
1849 | if (!drv) { |
1850 | return -ENOMEDIUM; | |
1851 | } | |
1852 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1853 | return -EIO; | |
1854 | } | |
1855 | ||
98f90dba ZYW |
1856 | /* throttling disk read I/O */ |
1857 | if (bs->io_limits_enabled) { | |
1858 | bdrv_io_limits_intercept(bs, false, nb_sectors); | |
1859 | } | |
1860 | ||
f4658285 | 1861 | if (bs->copy_on_read) { |
470c0504 SH |
1862 | flags |= BDRV_REQ_COPY_ON_READ; |
1863 | } | |
1864 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1865 | bs->copy_on_read_in_flight++; | |
1866 | } | |
1867 | ||
1868 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
1869 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1870 | } | |
1871 | ||
dbffbdcf | 1872 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 1873 | |
470c0504 | 1874 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
1875 | int pnum; |
1876 | ||
1877 | ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); | |
1878 | if (ret < 0) { | |
1879 | goto out; | |
1880 | } | |
1881 | ||
1882 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 1883 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1884 | goto out; |
1885 | } | |
1886 | } | |
1887 | ||
dbffbdcf | 1888 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1889 | |
1890 | out: | |
dbffbdcf | 1891 | tracked_request_end(&req); |
470c0504 SH |
1892 | |
1893 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1894 | bs->copy_on_read_in_flight--; | |
1895 | } | |
1896 | ||
dbffbdcf | 1897 | return ret; |
da1fa91d KW |
1898 | } |
1899 | ||
c5fbe571 | 1900 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
1901 | int nb_sectors, QEMUIOVector *qiov) |
1902 | { | |
c5fbe571 | 1903 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 1904 | |
470c0504 SH |
1905 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
1906 | } | |
1907 | ||
1908 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
1909 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1910 | { | |
1911 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
1912 | ||
1913 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
1914 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
1915 | } |
1916 | ||
f08f2dda SH |
1917 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
1918 | int64_t sector_num, int nb_sectors) | |
1919 | { | |
1920 | BlockDriver *drv = bs->drv; | |
1921 | QEMUIOVector qiov; | |
1922 | struct iovec iov; | |
1923 | int ret; | |
1924 | ||
621f0589 KW |
1925 | /* TODO Emulate only part of misaligned requests instead of letting block |
1926 | * drivers return -ENOTSUP and emulate everything */ | |
1927 | ||
f08f2dda SH |
1928 | /* First try the efficient write zeroes operation */ |
1929 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
1930 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
1931 | if (ret != -ENOTSUP) { | |
1932 | return ret; | |
1933 | } | |
f08f2dda SH |
1934 | } |
1935 | ||
1936 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
1937 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
1938 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
1939 | memset(iov.iov_base, 0, iov.iov_len); | |
1940 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1941 | ||
1942 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
1943 | ||
1944 | qemu_vfree(iov.iov_base); | |
1945 | return ret; | |
1946 | } | |
1947 | ||
c5fbe571 SH |
1948 | /* |
1949 | * Handle a write request in coroutine context | |
1950 | */ | |
1951 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
1952 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
1953 | BdrvRequestFlags flags) | |
c5fbe571 SH |
1954 | { |
1955 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 1956 | BdrvTrackedRequest req; |
6b7cb247 | 1957 | int ret; |
da1fa91d KW |
1958 | |
1959 | if (!bs->drv) { | |
1960 | return -ENOMEDIUM; | |
1961 | } | |
1962 | if (bs->read_only) { | |
1963 | return -EACCES; | |
1964 | } | |
1965 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1966 | return -EIO; | |
1967 | } | |
1968 | ||
98f90dba ZYW |
1969 | /* throttling disk write I/O */ |
1970 | if (bs->io_limits_enabled) { | |
1971 | bdrv_io_limits_intercept(bs, true, nb_sectors); | |
1972 | } | |
1973 | ||
470c0504 | 1974 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
1975 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1976 | } | |
1977 | ||
dbffbdcf SH |
1978 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
1979 | ||
f08f2dda SH |
1980 | if (flags & BDRV_REQ_ZERO_WRITE) { |
1981 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); | |
1982 | } else { | |
1983 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
1984 | } | |
6b7cb247 | 1985 | |
f05fa4ad PB |
1986 | if (ret == 0 && !bs->enable_write_cache) { |
1987 | ret = bdrv_co_flush(bs); | |
1988 | } | |
1989 | ||
da1fa91d KW |
1990 | if (bs->dirty_bitmap) { |
1991 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1992 | } | |
1993 | ||
1994 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1995 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1996 | } | |
1997 | ||
dbffbdcf SH |
1998 | tracked_request_end(&req); |
1999 | ||
6b7cb247 | 2000 | return ret; |
da1fa91d KW |
2001 | } |
2002 | ||
c5fbe571 SH |
2003 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2004 | int nb_sectors, QEMUIOVector *qiov) | |
2005 | { | |
2006 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2007 | ||
f08f2dda SH |
2008 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
2009 | } | |
2010 | ||
2011 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
2012 | int64_t sector_num, int nb_sectors) | |
2013 | { | |
2014 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
2015 | ||
2016 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
2017 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
2018 | } |
2019 | ||
83f64091 FB |
2020 | /** |
2021 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2022 | */ | |
2023 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2024 | { | |
2025 | BlockDriver *drv = bs->drv; | |
51762288 | 2026 | int ret; |
83f64091 | 2027 | if (!drv) |
19cb3738 | 2028 | return -ENOMEDIUM; |
83f64091 FB |
2029 | if (!drv->bdrv_truncate) |
2030 | return -ENOTSUP; | |
59f2689d NS |
2031 | if (bs->read_only) |
2032 | return -EACCES; | |
8591675f MT |
2033 | if (bdrv_in_use(bs)) |
2034 | return -EBUSY; | |
51762288 SH |
2035 | ret = drv->bdrv_truncate(bs, offset); |
2036 | if (ret == 0) { | |
2037 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2038 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2039 | } |
2040 | return ret; | |
83f64091 FB |
2041 | } |
2042 | ||
4a1d5e1f FZ |
2043 | /** |
2044 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2045 | * allocated space. Return < 0 if error or unknown. | |
2046 | */ | |
2047 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2048 | { | |
2049 | BlockDriver *drv = bs->drv; | |
2050 | if (!drv) { | |
2051 | return -ENOMEDIUM; | |
2052 | } | |
2053 | if (drv->bdrv_get_allocated_file_size) { | |
2054 | return drv->bdrv_get_allocated_file_size(bs); | |
2055 | } | |
2056 | if (bs->file) { | |
2057 | return bdrv_get_allocated_file_size(bs->file); | |
2058 | } | |
2059 | return -ENOTSUP; | |
2060 | } | |
2061 | ||
83f64091 FB |
2062 | /** |
2063 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2064 | */ | |
2065 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2066 | { | |
2067 | BlockDriver *drv = bs->drv; | |
2068 | if (!drv) | |
19cb3738 | 2069 | return -ENOMEDIUM; |
51762288 | 2070 | |
2c6942fa | 2071 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2072 | if (drv->bdrv_getlength) { |
2073 | return drv->bdrv_getlength(bs); | |
2074 | } | |
83f64091 | 2075 | } |
46a4e4e6 | 2076 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2077 | } |
2078 | ||
19cb3738 | 2079 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2080 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2081 | { |
19cb3738 FB |
2082 | int64_t length; |
2083 | length = bdrv_getlength(bs); | |
2084 | if (length < 0) | |
2085 | length = 0; | |
2086 | else | |
6ea44308 | 2087 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2088 | *nb_sectors_ptr = length; |
fc01f7e7 | 2089 | } |
cf98951b | 2090 | |
f3d54fc4 AL |
2091 | struct partition { |
2092 | uint8_t boot_ind; /* 0x80 - active */ | |
2093 | uint8_t head; /* starting head */ | |
2094 | uint8_t sector; /* starting sector */ | |
2095 | uint8_t cyl; /* starting cylinder */ | |
2096 | uint8_t sys_ind; /* What partition type */ | |
2097 | uint8_t end_head; /* end head */ | |
2098 | uint8_t end_sector; /* end sector */ | |
2099 | uint8_t end_cyl; /* end cylinder */ | |
2100 | uint32_t start_sect; /* starting sector counting from 0 */ | |
2101 | uint32_t nr_sects; /* nr of sectors in partition */ | |
541dc0d4 | 2102 | } QEMU_PACKED; |
f3d54fc4 AL |
2103 | |
2104 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
2105 | static int guess_disk_lchs(BlockDriverState *bs, | |
2106 | int *pcylinders, int *pheads, int *psectors) | |
2107 | { | |
eb5a3165 | 2108 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
2109 | int ret, i, heads, sectors, cylinders; |
2110 | struct partition *p; | |
2111 | uint32_t nr_sects; | |
a38131b6 | 2112 | uint64_t nb_sectors; |
498e386c | 2113 | bool enabled; |
f3d54fc4 AL |
2114 | |
2115 | bdrv_get_geometry(bs, &nb_sectors); | |
2116 | ||
498e386c ZYW |
2117 | /** |
2118 | * The function will be invoked during startup not only in sync I/O mode, | |
2119 | * but also in async I/O mode. So the I/O throttling function has to | |
2120 | * be disabled temporarily here, not permanently. | |
2121 | */ | |
2122 | enabled = bs->io_limits_enabled; | |
2123 | bs->io_limits_enabled = false; | |
f3d54fc4 | 2124 | ret = bdrv_read(bs, 0, buf, 1); |
498e386c | 2125 | bs->io_limits_enabled = enabled; |
f3d54fc4 AL |
2126 | if (ret < 0) |
2127 | return -1; | |
2128 | /* test msdos magic */ | |
2129 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
2130 | return -1; | |
2131 | for(i = 0; i < 4; i++) { | |
2132 | p = ((struct partition *)(buf + 0x1be)) + i; | |
2133 | nr_sects = le32_to_cpu(p->nr_sects); | |
2134 | if (nr_sects && p->end_head) { | |
2135 | /* We make the assumption that the partition terminates on | |
2136 | a cylinder boundary */ | |
2137 | heads = p->end_head + 1; | |
2138 | sectors = p->end_sector & 63; | |
2139 | if (sectors == 0) | |
2140 | continue; | |
2141 | cylinders = nb_sectors / (heads * sectors); | |
2142 | if (cylinders < 1 || cylinders > 16383) | |
2143 | continue; | |
2144 | *pheads = heads; | |
2145 | *psectors = sectors; | |
2146 | *pcylinders = cylinders; | |
2147 | #if 0 | |
2148 | printf("guessed geometry: LCHS=%d %d %d\n", | |
2149 | cylinders, heads, sectors); | |
2150 | #endif | |
2151 | return 0; | |
2152 | } | |
2153 | } | |
2154 | return -1; | |
2155 | } | |
2156 | ||
2157 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
2158 | { | |
2159 | int translation, lba_detected = 0; | |
2160 | int cylinders, heads, secs; | |
a38131b6 | 2161 | uint64_t nb_sectors; |
f3d54fc4 AL |
2162 | |
2163 | /* if a geometry hint is available, use it */ | |
2164 | bdrv_get_geometry(bs, &nb_sectors); | |
2165 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
2166 | translation = bdrv_get_translation_hint(bs); | |
2167 | if (cylinders != 0) { | |
2168 | *pcyls = cylinders; | |
2169 | *pheads = heads; | |
2170 | *psecs = secs; | |
2171 | } else { | |
2172 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
2173 | if (heads > 16) { | |
2174 | /* if heads > 16, it means that a BIOS LBA | |
2175 | translation was active, so the default | |
2176 | hardware geometry is OK */ | |
2177 | lba_detected = 1; | |
2178 | goto default_geometry; | |
2179 | } else { | |
2180 | *pcyls = cylinders; | |
2181 | *pheads = heads; | |
2182 | *psecs = secs; | |
2183 | /* disable any translation to be in sync with | |
2184 | the logical geometry */ | |
2185 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
2186 | bdrv_set_translation_hint(bs, | |
2187 | BIOS_ATA_TRANSLATION_NONE); | |
2188 | } | |
2189 | } | |
2190 | } else { | |
2191 | default_geometry: | |
2192 | /* if no geometry, use a standard physical disk geometry */ | |
2193 | cylinders = nb_sectors / (16 * 63); | |
2194 | ||
2195 | if (cylinders > 16383) | |
2196 | cylinders = 16383; | |
2197 | else if (cylinders < 2) | |
2198 | cylinders = 2; | |
2199 | *pcyls = cylinders; | |
2200 | *pheads = 16; | |
2201 | *psecs = 63; | |
2202 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
2203 | if ((*pcyls * *pheads) <= 131072) { | |
2204 | bdrv_set_translation_hint(bs, | |
2205 | BIOS_ATA_TRANSLATION_LARGE); | |
2206 | } else { | |
2207 | bdrv_set_translation_hint(bs, | |
2208 | BIOS_ATA_TRANSLATION_LBA); | |
2209 | } | |
2210 | } | |
2211 | } | |
2212 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
2213 | } | |
2214 | } | |
2215 | ||
5fafdf24 | 2216 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
2217 | int cyls, int heads, int secs) |
2218 | { | |
2219 | bs->cyls = cyls; | |
2220 | bs->heads = heads; | |
2221 | bs->secs = secs; | |
2222 | } | |
2223 | ||
46d4767d FB |
2224 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
2225 | { | |
2226 | bs->translation = translation; | |
2227 | } | |
2228 | ||
5fafdf24 | 2229 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
2230 | int *pcyls, int *pheads, int *psecs) |
2231 | { | |
2232 | *pcyls = bs->cyls; | |
2233 | *pheads = bs->heads; | |
2234 | *psecs = bs->secs; | |
2235 | } | |
2236 | ||
0563e191 ZYW |
2237 | /* throttling disk io limits */ |
2238 | void bdrv_set_io_limits(BlockDriverState *bs, | |
2239 | BlockIOLimit *io_limits) | |
2240 | { | |
2241 | bs->io_limits = *io_limits; | |
2242 | bs->io_limits_enabled = bdrv_io_limits_enabled(bs); | |
2243 | } | |
2244 | ||
5bbdbb46 BS |
2245 | /* Recognize floppy formats */ |
2246 | typedef struct FDFormat { | |
2247 | FDriveType drive; | |
2248 | uint8_t last_sect; | |
2249 | uint8_t max_track; | |
2250 | uint8_t max_head; | |
f8d3d128 | 2251 | FDriveRate rate; |
5bbdbb46 BS |
2252 | } FDFormat; |
2253 | ||
2254 | static const FDFormat fd_formats[] = { | |
2255 | /* First entry is default format */ | |
2256 | /* 1.44 MB 3"1/2 floppy disks */ | |
f8d3d128 HP |
2257 | { FDRIVE_DRV_144, 18, 80, 1, FDRIVE_RATE_500K, }, |
2258 | { FDRIVE_DRV_144, 20, 80, 1, FDRIVE_RATE_500K, }, | |
2259 | { FDRIVE_DRV_144, 21, 80, 1, FDRIVE_RATE_500K, }, | |
2260 | { FDRIVE_DRV_144, 21, 82, 1, FDRIVE_RATE_500K, }, | |
2261 | { FDRIVE_DRV_144, 21, 83, 1, FDRIVE_RATE_500K, }, | |
2262 | { FDRIVE_DRV_144, 22, 80, 1, FDRIVE_RATE_500K, }, | |
2263 | { FDRIVE_DRV_144, 23, 80, 1, FDRIVE_RATE_500K, }, | |
2264 | { FDRIVE_DRV_144, 24, 80, 1, FDRIVE_RATE_500K, }, | |
5bbdbb46 | 2265 | /* 2.88 MB 3"1/2 floppy disks */ |
f8d3d128 HP |
2266 | { FDRIVE_DRV_288, 36, 80, 1, FDRIVE_RATE_1M, }, |
2267 | { FDRIVE_DRV_288, 39, 80, 1, FDRIVE_RATE_1M, }, | |
2268 | { FDRIVE_DRV_288, 40, 80, 1, FDRIVE_RATE_1M, }, | |
2269 | { FDRIVE_DRV_288, 44, 80, 1, FDRIVE_RATE_1M, }, | |
2270 | { FDRIVE_DRV_288, 48, 80, 1, FDRIVE_RATE_1M, }, | |
5bbdbb46 | 2271 | /* 720 kB 3"1/2 floppy disks */ |
f8d3d128 HP |
2272 | { FDRIVE_DRV_144, 9, 80, 1, FDRIVE_RATE_250K, }, |
2273 | { FDRIVE_DRV_144, 10, 80, 1, FDRIVE_RATE_250K, }, | |
2274 | { FDRIVE_DRV_144, 10, 82, 1, FDRIVE_RATE_250K, }, | |
2275 | { FDRIVE_DRV_144, 10, 83, 1, FDRIVE_RATE_250K, }, | |
2276 | { FDRIVE_DRV_144, 13, 80, 1, FDRIVE_RATE_250K, }, | |
2277 | { FDRIVE_DRV_144, 14, 80, 1, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2278 | /* 1.2 MB 5"1/4 floppy disks */ |
f8d3d128 HP |
2279 | { FDRIVE_DRV_120, 15, 80, 1, FDRIVE_RATE_500K, }, |
2280 | { FDRIVE_DRV_120, 18, 80, 1, FDRIVE_RATE_500K, }, | |
2281 | { FDRIVE_DRV_120, 18, 82, 1, FDRIVE_RATE_500K, }, | |
2282 | { FDRIVE_DRV_120, 18, 83, 1, FDRIVE_RATE_500K, }, | |
2283 | { FDRIVE_DRV_120, 20, 80, 1, FDRIVE_RATE_500K, }, | |
5bbdbb46 | 2284 | /* 720 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2285 | { FDRIVE_DRV_120, 9, 80, 1, FDRIVE_RATE_250K, }, |
2286 | { FDRIVE_DRV_120, 11, 80, 1, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2287 | /* 360 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2288 | { FDRIVE_DRV_120, 9, 40, 1, FDRIVE_RATE_300K, }, |
2289 | { FDRIVE_DRV_120, 9, 40, 0, FDRIVE_RATE_300K, }, | |
2290 | { FDRIVE_DRV_120, 10, 41, 1, FDRIVE_RATE_300K, }, | |
2291 | { FDRIVE_DRV_120, 10, 42, 1, FDRIVE_RATE_300K, }, | |
5bbdbb46 | 2292 | /* 320 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2293 | { FDRIVE_DRV_120, 8, 40, 1, FDRIVE_RATE_250K, }, |
2294 | { FDRIVE_DRV_120, 8, 40, 0, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2295 | /* 360 kB must match 5"1/4 better than 3"1/2... */ |
f8d3d128 | 2296 | { FDRIVE_DRV_144, 9, 80, 0, FDRIVE_RATE_250K, }, |
5bbdbb46 | 2297 | /* end */ |
f8d3d128 | 2298 | { FDRIVE_DRV_NONE, -1, -1, 0, 0, }, |
5bbdbb46 BS |
2299 | }; |
2300 | ||
2301 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
2302 | int *max_track, int *last_sect, | |
f8d3d128 HP |
2303 | FDriveType drive_in, FDriveType *drive, |
2304 | FDriveRate *rate) | |
5bbdbb46 BS |
2305 | { |
2306 | const FDFormat *parse; | |
2307 | uint64_t nb_sectors, size; | |
2308 | int i, first_match, match; | |
2309 | ||
2310 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
2311 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
2312 | /* User defined disk */ | |
f8d3d128 | 2313 | *rate = FDRIVE_RATE_500K; |
5bbdbb46 BS |
2314 | } else { |
2315 | bdrv_get_geometry(bs, &nb_sectors); | |
2316 | match = -1; | |
2317 | first_match = -1; | |
2318 | for (i = 0; ; i++) { | |
2319 | parse = &fd_formats[i]; | |
2320 | if (parse->drive == FDRIVE_DRV_NONE) { | |
2321 | break; | |
2322 | } | |
2323 | if (drive_in == parse->drive || | |
2324 | drive_in == FDRIVE_DRV_NONE) { | |
2325 | size = (parse->max_head + 1) * parse->max_track * | |
2326 | parse->last_sect; | |
2327 | if (nb_sectors == size) { | |
2328 | match = i; | |
2329 | break; | |
2330 | } | |
2331 | if (first_match == -1) { | |
2332 | first_match = i; | |
2333 | } | |
2334 | } | |
2335 | } | |
2336 | if (match == -1) { | |
2337 | if (first_match == -1) { | |
2338 | match = 1; | |
2339 | } else { | |
2340 | match = first_match; | |
2341 | } | |
2342 | parse = &fd_formats[match]; | |
2343 | } | |
2344 | *nb_heads = parse->max_head + 1; | |
2345 | *max_track = parse->max_track; | |
2346 | *last_sect = parse->last_sect; | |
2347 | *drive = parse->drive; | |
f8d3d128 | 2348 | *rate = parse->rate; |
5bbdbb46 BS |
2349 | } |
2350 | } | |
2351 | ||
46d4767d FB |
2352 | int bdrv_get_translation_hint(BlockDriverState *bs) |
2353 | { | |
2354 | return bs->translation; | |
2355 | } | |
2356 | ||
abd7f68d MA |
2357 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
2358 | BlockErrorAction on_write_error) | |
2359 | { | |
2360 | bs->on_read_error = on_read_error; | |
2361 | bs->on_write_error = on_write_error; | |
2362 | } | |
2363 | ||
2364 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
2365 | { | |
2366 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2367 | } | |
2368 | ||
b338082b FB |
2369 | int bdrv_is_read_only(BlockDriverState *bs) |
2370 | { | |
2371 | return bs->read_only; | |
2372 | } | |
2373 | ||
985a03b0 TS |
2374 | int bdrv_is_sg(BlockDriverState *bs) |
2375 | { | |
2376 | return bs->sg; | |
2377 | } | |
2378 | ||
e900a7b7 CH |
2379 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2380 | { | |
2381 | return bs->enable_write_cache; | |
2382 | } | |
2383 | ||
425b0148 PB |
2384 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
2385 | { | |
2386 | bs->enable_write_cache = wce; | |
2387 | } | |
2388 | ||
ea2384d3 FB |
2389 | int bdrv_is_encrypted(BlockDriverState *bs) |
2390 | { | |
2391 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2392 | return 1; | |
2393 | return bs->encrypted; | |
2394 | } | |
2395 | ||
c0f4ce77 AL |
2396 | int bdrv_key_required(BlockDriverState *bs) |
2397 | { | |
2398 | BlockDriverState *backing_hd = bs->backing_hd; | |
2399 | ||
2400 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2401 | return 1; | |
2402 | return (bs->encrypted && !bs->valid_key); | |
2403 | } | |
2404 | ||
ea2384d3 FB |
2405 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2406 | { | |
2407 | int ret; | |
2408 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2409 | ret = bdrv_set_key(bs->backing_hd, key); | |
2410 | if (ret < 0) | |
2411 | return ret; | |
2412 | if (!bs->encrypted) | |
2413 | return 0; | |
2414 | } | |
fd04a2ae SH |
2415 | if (!bs->encrypted) { |
2416 | return -EINVAL; | |
2417 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2418 | return -ENOMEDIUM; | |
2419 | } | |
c0f4ce77 | 2420 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2421 | if (ret < 0) { |
2422 | bs->valid_key = 0; | |
2423 | } else if (!bs->valid_key) { | |
2424 | bs->valid_key = 1; | |
2425 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2426 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2427 | } |
c0f4ce77 | 2428 | return ret; |
ea2384d3 FB |
2429 | } |
2430 | ||
2431 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
2432 | { | |
19cb3738 | 2433 | if (!bs->drv) { |
ea2384d3 FB |
2434 | buf[0] = '\0'; |
2435 | } else { | |
2436 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
2437 | } | |
2438 | } | |
2439 | ||
5fafdf24 | 2440 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2441 | void *opaque) |
2442 | { | |
2443 | BlockDriver *drv; | |
2444 | ||
8a22f02a | 2445 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2446 | it(opaque, drv->format_name); |
2447 | } | |
2448 | } | |
2449 | ||
b338082b FB |
2450 | BlockDriverState *bdrv_find(const char *name) |
2451 | { | |
2452 | BlockDriverState *bs; | |
2453 | ||
1b7bdbc1 SH |
2454 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2455 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2456 | return bs; |
1b7bdbc1 | 2457 | } |
b338082b FB |
2458 | } |
2459 | return NULL; | |
2460 | } | |
2461 | ||
2f399b0a MA |
2462 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2463 | { | |
2464 | if (!bs) { | |
2465 | return QTAILQ_FIRST(&bdrv_states); | |
2466 | } | |
2467 | return QTAILQ_NEXT(bs, list); | |
2468 | } | |
2469 | ||
51de9760 | 2470 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2471 | { |
2472 | BlockDriverState *bs; | |
2473 | ||
1b7bdbc1 | 2474 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2475 | it(opaque, bs); |
81d0912d FB |
2476 | } |
2477 | } | |
2478 | ||
ea2384d3 FB |
2479 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2480 | { | |
2481 | return bs->device_name; | |
2482 | } | |
2483 | ||
c8433287 MA |
2484 | int bdrv_get_flags(BlockDriverState *bs) |
2485 | { | |
2486 | return bs->open_flags; | |
2487 | } | |
2488 | ||
c6ca28d6 AL |
2489 | void bdrv_flush_all(void) |
2490 | { | |
2491 | BlockDriverState *bs; | |
2492 | ||
1b7bdbc1 | 2493 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
29cdb251 | 2494 | bdrv_flush(bs); |
1b7bdbc1 | 2495 | } |
c6ca28d6 AL |
2496 | } |
2497 | ||
f2feebbd KW |
2498 | int bdrv_has_zero_init(BlockDriverState *bs) |
2499 | { | |
2500 | assert(bs->drv); | |
2501 | ||
336c1c12 KW |
2502 | if (bs->drv->bdrv_has_zero_init) { |
2503 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
2504 | } |
2505 | ||
2506 | return 1; | |
2507 | } | |
2508 | ||
376ae3f1 SH |
2509 | typedef struct BdrvCoIsAllocatedData { |
2510 | BlockDriverState *bs; | |
2511 | int64_t sector_num; | |
2512 | int nb_sectors; | |
2513 | int *pnum; | |
2514 | int ret; | |
2515 | bool done; | |
2516 | } BdrvCoIsAllocatedData; | |
2517 | ||
f58c7b35 TS |
2518 | /* |
2519 | * Returns true iff the specified sector is present in the disk image. Drivers | |
2520 | * not implementing the functionality are assumed to not support backing files, | |
2521 | * hence all their sectors are reported as allocated. | |
2522 | * | |
bd9533e3 SH |
2523 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
2524 | * and 'pnum' is set to 0. | |
2525 | * | |
f58c7b35 TS |
2526 | * 'pnum' is set to the number of sectors (including and immediately following |
2527 | * the specified sector) that are known to be in the same | |
2528 | * allocated/unallocated state. | |
2529 | * | |
bd9533e3 SH |
2530 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
2531 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 2532 | */ |
060f51c9 SH |
2533 | int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
2534 | int nb_sectors, int *pnum) | |
f58c7b35 | 2535 | { |
bd9533e3 SH |
2536 | int64_t n; |
2537 | ||
2538 | if (sector_num >= bs->total_sectors) { | |
2539 | *pnum = 0; | |
2540 | return 0; | |
2541 | } | |
2542 | ||
2543 | n = bs->total_sectors - sector_num; | |
2544 | if (n < nb_sectors) { | |
2545 | nb_sectors = n; | |
2546 | } | |
2547 | ||
6aebab14 | 2548 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 2549 | *pnum = nb_sectors; |
f58c7b35 TS |
2550 | return 1; |
2551 | } | |
6aebab14 | 2552 | |
060f51c9 SH |
2553 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
2554 | } | |
2555 | ||
2556 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
2557 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
2558 | { | |
2559 | BdrvCoIsAllocatedData *data = opaque; | |
2560 | BlockDriverState *bs = data->bs; | |
2561 | ||
2562 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
2563 | data->pnum); | |
2564 | data->done = true; | |
2565 | } | |
2566 | ||
2567 | /* | |
2568 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
2569 | * | |
2570 | * See bdrv_co_is_allocated() for details. | |
2571 | */ | |
2572 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
2573 | int *pnum) | |
2574 | { | |
6aebab14 SH |
2575 | Coroutine *co; |
2576 | BdrvCoIsAllocatedData data = { | |
2577 | .bs = bs, | |
2578 | .sector_num = sector_num, | |
2579 | .nb_sectors = nb_sectors, | |
2580 | .pnum = pnum, | |
2581 | .done = false, | |
2582 | }; | |
2583 | ||
2584 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
2585 | qemu_coroutine_enter(co, &data); | |
2586 | while (!data.done) { | |
2587 | qemu_aio_wait(); | |
2588 | } | |
2589 | return data.ret; | |
f58c7b35 TS |
2590 | } |
2591 | ||
188a7bbf PB |
2592 | /* |
2593 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
2594 | * | |
2595 | * Return true if the given sector is allocated in any image between | |
2596 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
2597 | * sector is allocated in any image of the chain. Return false otherwise. | |
2598 | * | |
2599 | * 'pnum' is set to the number of sectors (including and immediately following | |
2600 | * the specified sector) that are known to be in the same | |
2601 | * allocated/unallocated state. | |
2602 | * | |
2603 | */ | |
2604 | int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, | |
2605 | BlockDriverState *base, | |
2606 | int64_t sector_num, | |
2607 | int nb_sectors, int *pnum) | |
2608 | { | |
2609 | BlockDriverState *intermediate; | |
2610 | int ret, n = nb_sectors; | |
2611 | ||
2612 | intermediate = top; | |
2613 | while (intermediate && intermediate != base) { | |
2614 | int pnum_inter; | |
2615 | ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors, | |
2616 | &pnum_inter); | |
2617 | if (ret < 0) { | |
2618 | return ret; | |
2619 | } else if (ret) { | |
2620 | *pnum = pnum_inter; | |
2621 | return 1; | |
2622 | } | |
2623 | ||
2624 | /* | |
2625 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
2626 | * might have | |
2627 | * | |
2628 | * [sector_num+x, nr_sectors] allocated. | |
2629 | */ | |
2630 | if (n > pnum_inter) { | |
2631 | n = pnum_inter; | |
2632 | } | |
2633 | ||
2634 | intermediate = intermediate->backing_hd; | |
2635 | } | |
2636 | ||
2637 | *pnum = n; | |
2638 | return 0; | |
2639 | } | |
2640 | ||
b2023818 | 2641 | BlockInfoList *qmp_query_block(Error **errp) |
b338082b | 2642 | { |
b2023818 | 2643 | BlockInfoList *head = NULL, *cur_item = NULL; |
b338082b FB |
2644 | BlockDriverState *bs; |
2645 | ||
1b7bdbc1 | 2646 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
b2023818 | 2647 | BlockInfoList *info = g_malloc0(sizeof(*info)); |
d15e5465 | 2648 | |
b2023818 LC |
2649 | info->value = g_malloc0(sizeof(*info->value)); |
2650 | info->value->device = g_strdup(bs->device_name); | |
2651 | info->value->type = g_strdup("unknown"); | |
2652 | info->value->locked = bdrv_dev_is_medium_locked(bs); | |
2653 | info->value->removable = bdrv_dev_has_removable_media(bs); | |
d15e5465 | 2654 | |
e4def80b | 2655 | if (bdrv_dev_has_removable_media(bs)) { |
b2023818 LC |
2656 | info->value->has_tray_open = true; |
2657 | info->value->tray_open = bdrv_dev_is_tray_open(bs); | |
e4def80b | 2658 | } |
f04ef601 LC |
2659 | |
2660 | if (bdrv_iostatus_is_enabled(bs)) { | |
b2023818 LC |
2661 | info->value->has_io_status = true; |
2662 | info->value->io_status = bs->iostatus; | |
f04ef601 LC |
2663 | } |
2664 | ||
19cb3738 | 2665 | if (bs->drv) { |
b2023818 LC |
2666 | info->value->has_inserted = true; |
2667 | info->value->inserted = g_malloc0(sizeof(*info->value->inserted)); | |
2668 | info->value->inserted->file = g_strdup(bs->filename); | |
2669 | info->value->inserted->ro = bs->read_only; | |
2670 | info->value->inserted->drv = g_strdup(bs->drv->format_name); | |
2671 | info->value->inserted->encrypted = bs->encrypted; | |
2672 | if (bs->backing_file[0]) { | |
2673 | info->value->inserted->has_backing_file = true; | |
2674 | info->value->inserted->backing_file = g_strdup(bs->backing_file); | |
376253ec | 2675 | } |
727f005e ZYW |
2676 | |
2677 | if (bs->io_limits_enabled) { | |
2678 | info->value->inserted->bps = | |
2679 | bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
2680 | info->value->inserted->bps_rd = | |
2681 | bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; | |
2682 | info->value->inserted->bps_wr = | |
2683 | bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; | |
2684 | info->value->inserted->iops = | |
2685 | bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
2686 | info->value->inserted->iops_rd = | |
2687 | bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; | |
2688 | info->value->inserted->iops_wr = | |
2689 | bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; | |
2690 | } | |
b2023818 | 2691 | } |
d15e5465 | 2692 | |
b2023818 LC |
2693 | /* XXX: waiting for the qapi to support GSList */ |
2694 | if (!cur_item) { | |
2695 | head = cur_item = info; | |
2696 | } else { | |
2697 | cur_item->next = info; | |
2698 | cur_item = info; | |
b338082b | 2699 | } |
b338082b | 2700 | } |
d15e5465 | 2701 | |
b2023818 | 2702 | return head; |
b338082b | 2703 | } |
a36e69dd | 2704 | |
f11f57e4 LC |
2705 | /* Consider exposing this as a full fledged QMP command */ |
2706 | static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) | |
2707 | { | |
2708 | BlockStats *s; | |
2709 | ||
2710 | s = g_malloc0(sizeof(*s)); | |
2711 | ||
2712 | if (bs->device_name[0]) { | |
2713 | s->has_device = true; | |
2714 | s->device = g_strdup(bs->device_name); | |
294cc35f KW |
2715 | } |
2716 | ||
f11f57e4 LC |
2717 | s->stats = g_malloc0(sizeof(*s->stats)); |
2718 | s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; | |
2719 | s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; | |
2720 | s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; | |
2721 | s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; | |
2722 | s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; | |
2723 | s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; | |
2724 | s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; | |
2725 | s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; | |
2726 | s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; | |
2727 | ||
294cc35f | 2728 | if (bs->file) { |
f11f57e4 LC |
2729 | s->has_parent = true; |
2730 | s->parent = qmp_query_blockstat(bs->file, NULL); | |
294cc35f KW |
2731 | } |
2732 | ||
f11f57e4 | 2733 | return s; |
294cc35f KW |
2734 | } |
2735 | ||
f11f57e4 | 2736 | BlockStatsList *qmp_query_blockstats(Error **errp) |
218a536a | 2737 | { |
f11f57e4 | 2738 | BlockStatsList *head = NULL, *cur_item = NULL; |
a36e69dd TS |
2739 | BlockDriverState *bs; |
2740 | ||
1b7bdbc1 | 2741 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f11f57e4 LC |
2742 | BlockStatsList *info = g_malloc0(sizeof(*info)); |
2743 | info->value = qmp_query_blockstat(bs, NULL); | |
2744 | ||
2745 | /* XXX: waiting for the qapi to support GSList */ | |
2746 | if (!cur_item) { | |
2747 | head = cur_item = info; | |
2748 | } else { | |
2749 | cur_item->next = info; | |
2750 | cur_item = info; | |
2751 | } | |
a36e69dd | 2752 | } |
218a536a | 2753 | |
f11f57e4 | 2754 | return head; |
a36e69dd | 2755 | } |
ea2384d3 | 2756 | |
045df330 AL |
2757 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
2758 | { | |
2759 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2760 | return bs->backing_file; | |
2761 | else if (bs->encrypted) | |
2762 | return bs->filename; | |
2763 | else | |
2764 | return NULL; | |
2765 | } | |
2766 | ||
5fafdf24 | 2767 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
2768 | char *filename, int filename_size) |
2769 | { | |
3574c608 | 2770 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
2771 | } |
2772 | ||
5fafdf24 | 2773 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
2774 | const uint8_t *buf, int nb_sectors) |
2775 | { | |
2776 | BlockDriver *drv = bs->drv; | |
2777 | if (!drv) | |
19cb3738 | 2778 | return -ENOMEDIUM; |
faea38e7 FB |
2779 | if (!drv->bdrv_write_compressed) |
2780 | return -ENOTSUP; | |
fbb7b4e0 KW |
2781 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2782 | return -EIO; | |
a55eb92c | 2783 | |
c6d22830 | 2784 | if (bs->dirty_bitmap) { |
7cd1e32a | 2785 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
2786 | } | |
a55eb92c | 2787 | |
faea38e7 FB |
2788 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
2789 | } | |
3b46e624 | 2790 | |
faea38e7 FB |
2791 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
2792 | { | |
2793 | BlockDriver *drv = bs->drv; | |
2794 | if (!drv) | |
19cb3738 | 2795 | return -ENOMEDIUM; |
faea38e7 FB |
2796 | if (!drv->bdrv_get_info) |
2797 | return -ENOTSUP; | |
2798 | memset(bdi, 0, sizeof(*bdi)); | |
2799 | return drv->bdrv_get_info(bs, bdi); | |
2800 | } | |
2801 | ||
45566e9c CH |
2802 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
2803 | int64_t pos, int size) | |
178e08a5 AL |
2804 | { |
2805 | BlockDriver *drv = bs->drv; | |
2806 | if (!drv) | |
2807 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2808 | if (drv->bdrv_save_vmstate) |
2809 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
2810 | if (bs->file) | |
2811 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
2812 | return -ENOTSUP; | |
178e08a5 AL |
2813 | } |
2814 | ||
45566e9c CH |
2815 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2816 | int64_t pos, int size) | |
178e08a5 AL |
2817 | { |
2818 | BlockDriver *drv = bs->drv; | |
2819 | if (!drv) | |
2820 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2821 | if (drv->bdrv_load_vmstate) |
2822 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
2823 | if (bs->file) | |
2824 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
2825 | return -ENOTSUP; | |
178e08a5 AL |
2826 | } |
2827 | ||
8b9b0cc2 KW |
2828 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
2829 | { | |
2830 | BlockDriver *drv = bs->drv; | |
2831 | ||
2832 | if (!drv || !drv->bdrv_debug_event) { | |
2833 | return; | |
2834 | } | |
2835 | ||
2836 | return drv->bdrv_debug_event(bs, event); | |
2837 | ||
2838 | } | |
2839 | ||
faea38e7 FB |
2840 | /**************************************************************/ |
2841 | /* handling of snapshots */ | |
2842 | ||
feeee5ac MDCF |
2843 | int bdrv_can_snapshot(BlockDriverState *bs) |
2844 | { | |
2845 | BlockDriver *drv = bs->drv; | |
07b70bfb | 2846 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
feeee5ac MDCF |
2847 | return 0; |
2848 | } | |
2849 | ||
2850 | if (!drv->bdrv_snapshot_create) { | |
2851 | if (bs->file != NULL) { | |
2852 | return bdrv_can_snapshot(bs->file); | |
2853 | } | |
2854 | return 0; | |
2855 | } | |
2856 | ||
2857 | return 1; | |
2858 | } | |
2859 | ||
199630b6 BS |
2860 | int bdrv_is_snapshot(BlockDriverState *bs) |
2861 | { | |
2862 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
2863 | } | |
2864 | ||
f9092b10 MA |
2865 | BlockDriverState *bdrv_snapshots(void) |
2866 | { | |
2867 | BlockDriverState *bs; | |
2868 | ||
3ac906f7 | 2869 | if (bs_snapshots) { |
f9092b10 | 2870 | return bs_snapshots; |
3ac906f7 | 2871 | } |
f9092b10 MA |
2872 | |
2873 | bs = NULL; | |
2874 | while ((bs = bdrv_next(bs))) { | |
2875 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
2876 | bs_snapshots = bs; |
2877 | return bs; | |
f9092b10 MA |
2878 | } |
2879 | } | |
2880 | return NULL; | |
f9092b10 MA |
2881 | } |
2882 | ||
5fafdf24 | 2883 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
2884 | QEMUSnapshotInfo *sn_info) |
2885 | { | |
2886 | BlockDriver *drv = bs->drv; | |
2887 | if (!drv) | |
19cb3738 | 2888 | return -ENOMEDIUM; |
7cdb1f6d MK |
2889 | if (drv->bdrv_snapshot_create) |
2890 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2891 | if (bs->file) | |
2892 | return bdrv_snapshot_create(bs->file, sn_info); | |
2893 | return -ENOTSUP; | |
faea38e7 FB |
2894 | } |
2895 | ||
5fafdf24 | 2896 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
2897 | const char *snapshot_id) |
2898 | { | |
2899 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
2900 | int ret, open_ret; |
2901 | ||
faea38e7 | 2902 | if (!drv) |
19cb3738 | 2903 | return -ENOMEDIUM; |
7cdb1f6d MK |
2904 | if (drv->bdrv_snapshot_goto) |
2905 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2906 | ||
2907 | if (bs->file) { | |
2908 | drv->bdrv_close(bs); | |
2909 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2910 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2911 | if (open_ret < 0) { | |
2912 | bdrv_delete(bs->file); | |
2913 | bs->drv = NULL; | |
2914 | return open_ret; | |
2915 | } | |
2916 | return ret; | |
2917 | } | |
2918 | ||
2919 | return -ENOTSUP; | |
faea38e7 FB |
2920 | } |
2921 | ||
2922 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2923 | { | |
2924 | BlockDriver *drv = bs->drv; | |
2925 | if (!drv) | |
19cb3738 | 2926 | return -ENOMEDIUM; |
7cdb1f6d MK |
2927 | if (drv->bdrv_snapshot_delete) |
2928 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2929 | if (bs->file) | |
2930 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2931 | return -ENOTSUP; | |
faea38e7 FB |
2932 | } |
2933 | ||
5fafdf24 | 2934 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
2935 | QEMUSnapshotInfo **psn_info) |
2936 | { | |
2937 | BlockDriver *drv = bs->drv; | |
2938 | if (!drv) | |
19cb3738 | 2939 | return -ENOMEDIUM; |
7cdb1f6d MK |
2940 | if (drv->bdrv_snapshot_list) |
2941 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2942 | if (bs->file) | |
2943 | return bdrv_snapshot_list(bs->file, psn_info); | |
2944 | return -ENOTSUP; | |
faea38e7 FB |
2945 | } |
2946 | ||
51ef6727 | 2947 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
2948 | const char *snapshot_name) | |
2949 | { | |
2950 | BlockDriver *drv = bs->drv; | |
2951 | if (!drv) { | |
2952 | return -ENOMEDIUM; | |
2953 | } | |
2954 | if (!bs->read_only) { | |
2955 | return -EINVAL; | |
2956 | } | |
2957 | if (drv->bdrv_snapshot_load_tmp) { | |
2958 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2959 | } | |
2960 | return -ENOTSUP; | |
2961 | } | |
2962 | ||
e8a6bb9c MT |
2963 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
2964 | const char *backing_file) | |
2965 | { | |
2966 | if (!bs->drv) { | |
2967 | return NULL; | |
2968 | } | |
2969 | ||
2970 | if (bs->backing_hd) { | |
2971 | if (strcmp(bs->backing_file, backing_file) == 0) { | |
2972 | return bs->backing_hd; | |
2973 | } else { | |
2974 | return bdrv_find_backing_image(bs->backing_hd, backing_file); | |
2975 | } | |
2976 | } | |
2977 | ||
2978 | return NULL; | |
2979 | } | |
2980 | ||
faea38e7 FB |
2981 | #define NB_SUFFIXES 4 |
2982 | ||
2983 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2984 | { | |
2985 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2986 | int64_t base; | |
2987 | int i; | |
2988 | ||
2989 | if (size <= 999) { | |
2990 | snprintf(buf, buf_size, "%" PRId64, size); | |
2991 | } else { | |
2992 | base = 1024; | |
2993 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2994 | if (size < (10 * base)) { | |
5fafdf24 | 2995 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
2996 | (double)size / base, |
2997 | suffixes[i]); | |
2998 | break; | |
2999 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 3000 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
3001 | ((size + (base >> 1)) / base), |
3002 | suffixes[i]); | |
3003 | break; | |
3004 | } | |
3005 | base = base * 1024; | |
3006 | } | |
3007 | } | |
3008 | return buf; | |
3009 | } | |
3010 | ||
3011 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
3012 | { | |
3013 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
3014 | #ifdef _WIN32 |
3015 | struct tm *ptm; | |
3016 | #else | |
faea38e7 | 3017 | struct tm tm; |
3b9f94e1 | 3018 | #endif |
faea38e7 FB |
3019 | time_t ti; |
3020 | int64_t secs; | |
3021 | ||
3022 | if (!sn) { | |
5fafdf24 TS |
3023 | snprintf(buf, buf_size, |
3024 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
3025 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
3026 | } else { | |
3027 | ti = sn->date_sec; | |
3b9f94e1 FB |
3028 | #ifdef _WIN32 |
3029 | ptm = localtime(&ti); | |
3030 | strftime(date_buf, sizeof(date_buf), | |
3031 | "%Y-%m-%d %H:%M:%S", ptm); | |
3032 | #else | |
faea38e7 FB |
3033 | localtime_r(&ti, &tm); |
3034 | strftime(date_buf, sizeof(date_buf), | |
3035 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 3036 | #endif |
faea38e7 FB |
3037 | secs = sn->vm_clock_nsec / 1000000000; |
3038 | snprintf(clock_buf, sizeof(clock_buf), | |
3039 | "%02d:%02d:%02d.%03d", | |
3040 | (int)(secs / 3600), | |
3041 | (int)((secs / 60) % 60), | |
5fafdf24 | 3042 | (int)(secs % 60), |
faea38e7 FB |
3043 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
3044 | snprintf(buf, buf_size, | |
5fafdf24 | 3045 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
3046 | sn->id_str, sn->name, |
3047 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
3048 | date_buf, | |
3049 | clock_buf); | |
3050 | } | |
3051 | return buf; | |
3052 | } | |
3053 | ||
ea2384d3 | 3054 | /**************************************************************/ |
83f64091 | 3055 | /* async I/Os */ |
ea2384d3 | 3056 | |
3b69e4b9 | 3057 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3058 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3059 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3060 | { |
bbf0a440 SH |
3061 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3062 | ||
b2a61371 | 3063 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3064 | cb, opaque, false); |
ea2384d3 FB |
3065 | } |
3066 | ||
f141eafe AL |
3067 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3068 | QEMUIOVector *qiov, int nb_sectors, | |
3069 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3070 | { |
bbf0a440 SH |
3071 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3072 | ||
1a6e115b | 3073 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3074 | cb, opaque, true); |
83f64091 FB |
3075 | } |
3076 | ||
40b4f539 KW |
3077 | |
3078 | typedef struct MultiwriteCB { | |
3079 | int error; | |
3080 | int num_requests; | |
3081 | int num_callbacks; | |
3082 | struct { | |
3083 | BlockDriverCompletionFunc *cb; | |
3084 | void *opaque; | |
3085 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3086 | } callbacks[]; |
3087 | } MultiwriteCB; | |
3088 | ||
3089 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3090 | { | |
3091 | int i; | |
3092 | ||
3093 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3094 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3095 | if (mcb->callbacks[i].free_qiov) { |
3096 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3097 | } | |
7267c094 | 3098 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3099 | } |
3100 | } | |
3101 | ||
3102 | static void multiwrite_cb(void *opaque, int ret) | |
3103 | { | |
3104 | MultiwriteCB *mcb = opaque; | |
3105 | ||
6d519a5f SH |
3106 | trace_multiwrite_cb(mcb, ret); |
3107 | ||
cb6d3ca0 | 3108 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3109 | mcb->error = ret; |
40b4f539 KW |
3110 | } |
3111 | ||
3112 | mcb->num_requests--; | |
3113 | if (mcb->num_requests == 0) { | |
de189a1b | 3114 | multiwrite_user_cb(mcb); |
7267c094 | 3115 | g_free(mcb); |
40b4f539 KW |
3116 | } |
3117 | } | |
3118 | ||
3119 | static int multiwrite_req_compare(const void *a, const void *b) | |
3120 | { | |
77be4366 CH |
3121 | const BlockRequest *req1 = a, *req2 = b; |
3122 | ||
3123 | /* | |
3124 | * Note that we can't simply subtract req2->sector from req1->sector | |
3125 | * here as that could overflow the return value. | |
3126 | */ | |
3127 | if (req1->sector > req2->sector) { | |
3128 | return 1; | |
3129 | } else if (req1->sector < req2->sector) { | |
3130 | return -1; | |
3131 | } else { | |
3132 | return 0; | |
3133 | } | |
40b4f539 KW |
3134 | } |
3135 | ||
3136 | /* | |
3137 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3138 | * requests that remain after merging. | |
3139 | */ | |
3140 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3141 | int num_reqs, MultiwriteCB *mcb) | |
3142 | { | |
3143 | int i, outidx; | |
3144 | ||
3145 | // Sort requests by start sector | |
3146 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3147 | ||
3148 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3149 | // filling up gaps with zero sectors. | |
3150 | outidx = 0; | |
3151 | for (i = 1; i < num_reqs; i++) { | |
3152 | int merge = 0; | |
3153 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3154 | ||
b6a127a1 | 3155 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3156 | if (reqs[i].sector <= oldreq_last) { |
3157 | merge = 1; | |
3158 | } | |
3159 | ||
e2a305fb CH |
3160 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3161 | merge = 0; | |
3162 | } | |
3163 | ||
40b4f539 KW |
3164 | if (merge) { |
3165 | size_t size; | |
7267c094 | 3166 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3167 | qemu_iovec_init(qiov, |
3168 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3169 | ||
3170 | // Add the first request to the merged one. If the requests are | |
3171 | // overlapping, drop the last sectors of the first request. | |
3172 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
3173 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
3174 | ||
b6a127a1 PB |
3175 | // We should need to add any zeros between the two requests |
3176 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3177 | |
3178 | // Add the second request | |
3179 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
3180 | ||
cbf1dff2 | 3181 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3182 | reqs[outidx].qiov = qiov; |
3183 | ||
3184 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3185 | } else { | |
3186 | outidx++; | |
3187 | reqs[outidx].sector = reqs[i].sector; | |
3188 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3189 | reqs[outidx].qiov = reqs[i].qiov; | |
3190 | } | |
3191 | } | |
3192 | ||
3193 | return outidx + 1; | |
3194 | } | |
3195 | ||
3196 | /* | |
3197 | * Submit multiple AIO write requests at once. | |
3198 | * | |
3199 | * On success, the function returns 0 and all requests in the reqs array have | |
3200 | * been submitted. In error case this function returns -1, and any of the | |
3201 | * requests may or may not be submitted yet. In particular, this means that the | |
3202 | * callback will be called for some of the requests, for others it won't. The | |
3203 | * caller must check the error field of the BlockRequest to wait for the right | |
3204 | * callbacks (if error != 0, no callback will be called). | |
3205 | * | |
3206 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3207 | * requests. However, the fields opaque and error are left unmodified as they | |
3208 | * are used to signal failure for a single request to the caller. | |
3209 | */ | |
3210 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3211 | { | |
40b4f539 KW |
3212 | MultiwriteCB *mcb; |
3213 | int i; | |
3214 | ||
301db7c2 RH |
3215 | /* don't submit writes if we don't have a medium */ |
3216 | if (bs->drv == NULL) { | |
3217 | for (i = 0; i < num_reqs; i++) { | |
3218 | reqs[i].error = -ENOMEDIUM; | |
3219 | } | |
3220 | return -1; | |
3221 | } | |
3222 | ||
40b4f539 KW |
3223 | if (num_reqs == 0) { |
3224 | return 0; | |
3225 | } | |
3226 | ||
3227 | // Create MultiwriteCB structure | |
7267c094 | 3228 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3229 | mcb->num_requests = 0; |
3230 | mcb->num_callbacks = num_reqs; | |
3231 | ||
3232 | for (i = 0; i < num_reqs; i++) { | |
3233 | mcb->callbacks[i].cb = reqs[i].cb; | |
3234 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3235 | } | |
3236 | ||
3237 | // Check for mergable requests | |
3238 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3239 | ||
6d519a5f SH |
3240 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3241 | ||
df9309fb PB |
3242 | /* Run the aio requests. */ |
3243 | mcb->num_requests = num_reqs; | |
40b4f539 | 3244 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3245 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3246 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3247 | } |
3248 | ||
3249 | return 0; | |
40b4f539 KW |
3250 | } |
3251 | ||
83f64091 | 3252 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3253 | { |
6bbff9a0 | 3254 | acb->pool->cancel(acb); |
83f64091 FB |
3255 | } |
3256 | ||
98f90dba ZYW |
3257 | /* block I/O throttling */ |
3258 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, | |
3259 | bool is_write, double elapsed_time, uint64_t *wait) | |
3260 | { | |
3261 | uint64_t bps_limit = 0; | |
3262 | double bytes_limit, bytes_base, bytes_res; | |
3263 | double slice_time, wait_time; | |
3264 | ||
3265 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3266 | bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
3267 | } else if (bs->io_limits.bps[is_write]) { | |
3268 | bps_limit = bs->io_limits.bps[is_write]; | |
3269 | } else { | |
3270 | if (wait) { | |
3271 | *wait = 0; | |
3272 | } | |
3273 | ||
3274 | return false; | |
3275 | } | |
3276 | ||
3277 | slice_time = bs->slice_end - bs->slice_start; | |
3278 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3279 | bytes_limit = bps_limit * slice_time; | |
3280 | bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; | |
3281 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3282 | bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; | |
3283 | } | |
3284 | ||
3285 | /* bytes_base: the bytes of data which have been read/written; and | |
3286 | * it is obtained from the history statistic info. | |
3287 | * bytes_res: the remaining bytes of data which need to be read/written. | |
3288 | * (bytes_base + bytes_res) / bps_limit: used to calcuate | |
3289 | * the total time for completing reading/writting all data. | |
3290 | */ | |
3291 | bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
3292 | ||
3293 | if (bytes_base + bytes_res <= bytes_limit) { | |
3294 | if (wait) { | |
3295 | *wait = 0; | |
3296 | } | |
3297 | ||
3298 | return false; | |
3299 | } | |
3300 | ||
3301 | /* Calc approx time to dispatch */ | |
3302 | wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; | |
3303 | ||
3304 | /* When the I/O rate at runtime exceeds the limits, | |
3305 | * bs->slice_end need to be extended in order that the current statistic | |
3306 | * info can be kept until the timer fire, so it is increased and tuned | |
3307 | * based on the result of experiment. | |
3308 | */ | |
3309 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3310 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3311 | if (wait) { | |
3312 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3313 | } | |
3314 | ||
3315 | return true; | |
3316 | } | |
3317 | ||
3318 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
3319 | double elapsed_time, uint64_t *wait) | |
3320 | { | |
3321 | uint64_t iops_limit = 0; | |
3322 | double ios_limit, ios_base; | |
3323 | double slice_time, wait_time; | |
3324 | ||
3325 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3326 | iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
3327 | } else if (bs->io_limits.iops[is_write]) { | |
3328 | iops_limit = bs->io_limits.iops[is_write]; | |
3329 | } else { | |
3330 | if (wait) { | |
3331 | *wait = 0; | |
3332 | } | |
3333 | ||
3334 | return false; | |
3335 | } | |
3336 | ||
3337 | slice_time = bs->slice_end - bs->slice_start; | |
3338 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3339 | ios_limit = iops_limit * slice_time; | |
3340 | ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; | |
3341 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3342 | ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; | |
3343 | } | |
3344 | ||
3345 | if (ios_base + 1 <= ios_limit) { | |
3346 | if (wait) { | |
3347 | *wait = 0; | |
3348 | } | |
3349 | ||
3350 | return false; | |
3351 | } | |
3352 | ||
3353 | /* Calc approx time to dispatch */ | |
3354 | wait_time = (ios_base + 1) / iops_limit; | |
3355 | if (wait_time > elapsed_time) { | |
3356 | wait_time = wait_time - elapsed_time; | |
3357 | } else { | |
3358 | wait_time = 0; | |
3359 | } | |
3360 | ||
3361 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3362 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3363 | if (wait) { | |
3364 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3365 | } | |
3366 | ||
3367 | return true; | |
3368 | } | |
3369 | ||
3370 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
3371 | bool is_write, int64_t *wait) | |
3372 | { | |
3373 | int64_t now, max_wait; | |
3374 | uint64_t bps_wait = 0, iops_wait = 0; | |
3375 | double elapsed_time; | |
3376 | int bps_ret, iops_ret; | |
3377 | ||
3378 | now = qemu_get_clock_ns(vm_clock); | |
3379 | if ((bs->slice_start < now) | |
3380 | && (bs->slice_end > now)) { | |
3381 | bs->slice_end = now + bs->slice_time; | |
3382 | } else { | |
3383 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
3384 | bs->slice_start = now; | |
3385 | bs->slice_end = now + bs->slice_time; | |
3386 | ||
3387 | bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; | |
3388 | bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; | |
3389 | ||
3390 | bs->io_base.ios[is_write] = bs->nr_ops[is_write]; | |
3391 | bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; | |
3392 | } | |
3393 | ||
3394 | elapsed_time = now - bs->slice_start; | |
3395 | elapsed_time /= (NANOSECONDS_PER_SECOND); | |
3396 | ||
3397 | bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, | |
3398 | is_write, elapsed_time, &bps_wait); | |
3399 | iops_ret = bdrv_exceed_iops_limits(bs, is_write, | |
3400 | elapsed_time, &iops_wait); | |
3401 | if (bps_ret || iops_ret) { | |
3402 | max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; | |
3403 | if (wait) { | |
3404 | *wait = max_wait; | |
3405 | } | |
3406 | ||
3407 | now = qemu_get_clock_ns(vm_clock); | |
3408 | if (bs->slice_end < now + max_wait) { | |
3409 | bs->slice_end = now + max_wait; | |
3410 | } | |
3411 | ||
3412 | return true; | |
3413 | } | |
3414 | ||
3415 | if (wait) { | |
3416 | *wait = 0; | |
3417 | } | |
3418 | ||
3419 | return false; | |
3420 | } | |
ce1a14dc | 3421 | |
83f64091 FB |
3422 | /**************************************************************/ |
3423 | /* async block device emulation */ | |
3424 | ||
c16b5a2c CH |
3425 | typedef struct BlockDriverAIOCBSync { |
3426 | BlockDriverAIOCB common; | |
3427 | QEMUBH *bh; | |
3428 | int ret; | |
3429 | /* vector translation state */ | |
3430 | QEMUIOVector *qiov; | |
3431 | uint8_t *bounce; | |
3432 | int is_write; | |
3433 | } BlockDriverAIOCBSync; | |
3434 | ||
3435 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3436 | { | |
b666d239 KW |
3437 | BlockDriverAIOCBSync *acb = |
3438 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3439 | qemu_bh_delete(acb->bh); |
36afc451 | 3440 | acb->bh = NULL; |
c16b5a2c CH |
3441 | qemu_aio_release(acb); |
3442 | } | |
3443 | ||
3444 | static AIOPool bdrv_em_aio_pool = { | |
3445 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
3446 | .cancel = bdrv_aio_cancel_em, | |
3447 | }; | |
3448 | ||
ce1a14dc | 3449 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3450 | { |
ce1a14dc | 3451 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3452 | |
f141eafe AL |
3453 | if (!acb->is_write) |
3454 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 3455 | qemu_vfree(acb->bounce); |
ce1a14dc | 3456 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3457 | qemu_bh_delete(acb->bh); |
36afc451 | 3458 | acb->bh = NULL; |
ce1a14dc | 3459 | qemu_aio_release(acb); |
83f64091 | 3460 | } |
beac80cd | 3461 | |
f141eafe AL |
3462 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3463 | int64_t sector_num, | |
3464 | QEMUIOVector *qiov, | |
3465 | int nb_sectors, | |
3466 | BlockDriverCompletionFunc *cb, | |
3467 | void *opaque, | |
3468 | int is_write) | |
3469 | ||
83f64091 | 3470 | { |
ce1a14dc | 3471 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3472 | |
c16b5a2c | 3473 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
3474 | acb->is_write = is_write; |
3475 | acb->qiov = qiov; | |
e268ca52 | 3476 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3477 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3478 | |
3479 | if (is_write) { | |
3480 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1ed20acf | 3481 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3482 | } else { |
1ed20acf | 3483 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3484 | } |
3485 | ||
ce1a14dc | 3486 | qemu_bh_schedule(acb->bh); |
f141eafe | 3487 | |
ce1a14dc | 3488 | return &acb->common; |
beac80cd FB |
3489 | } |
3490 | ||
f141eafe AL |
3491 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3492 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3493 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3494 | { |
f141eafe AL |
3495 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3496 | } | |
83f64091 | 3497 | |
f141eafe AL |
3498 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3499 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3500 | BlockDriverCompletionFunc *cb, void *opaque) | |
3501 | { | |
3502 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3503 | } |
beac80cd | 3504 | |
68485420 KW |
3505 | |
3506 | typedef struct BlockDriverAIOCBCoroutine { | |
3507 | BlockDriverAIOCB common; | |
3508 | BlockRequest req; | |
3509 | bool is_write; | |
3510 | QEMUBH* bh; | |
3511 | } BlockDriverAIOCBCoroutine; | |
3512 | ||
3513 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3514 | { | |
3515 | qemu_aio_flush(); | |
3516 | } | |
3517 | ||
3518 | static AIOPool bdrv_em_co_aio_pool = { | |
3519 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), | |
3520 | .cancel = bdrv_aio_co_cancel_em, | |
3521 | }; | |
3522 | ||
35246a68 | 3523 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3524 | { |
3525 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3526 | ||
3527 | acb->common.cb(acb->common.opaque, acb->req.error); | |
3528 | qemu_bh_delete(acb->bh); | |
3529 | qemu_aio_release(acb); | |
3530 | } | |
3531 | ||
b2a61371 SH |
3532 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3533 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3534 | { | |
3535 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3536 | BlockDriverState *bs = acb->common.bs; | |
3537 | ||
3538 | if (!acb->is_write) { | |
3539 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3540 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3541 | } else { |
3542 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3543 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3544 | } |
3545 | ||
35246a68 | 3546 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3547 | qemu_bh_schedule(acb->bh); |
3548 | } | |
3549 | ||
68485420 KW |
3550 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3551 | int64_t sector_num, | |
3552 | QEMUIOVector *qiov, | |
3553 | int nb_sectors, | |
3554 | BlockDriverCompletionFunc *cb, | |
3555 | void *opaque, | |
8c5873d6 | 3556 | bool is_write) |
68485420 KW |
3557 | { |
3558 | Coroutine *co; | |
3559 | BlockDriverAIOCBCoroutine *acb; | |
3560 | ||
3561 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3562 | acb->req.sector = sector_num; | |
3563 | acb->req.nb_sectors = nb_sectors; | |
3564 | acb->req.qiov = qiov; | |
3565 | acb->is_write = is_write; | |
3566 | ||
8c5873d6 | 3567 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3568 | qemu_coroutine_enter(co, acb); |
3569 | ||
3570 | return &acb->common; | |
3571 | } | |
3572 | ||
07f07615 | 3573 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3574 | { |
07f07615 PB |
3575 | BlockDriverAIOCBCoroutine *acb = opaque; |
3576 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3577 | |
07f07615 PB |
3578 | acb->req.error = bdrv_co_flush(bs); |
3579 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3580 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3581 | } |
3582 | ||
07f07615 | 3583 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3584 | BlockDriverCompletionFunc *cb, void *opaque) |
3585 | { | |
07f07615 | 3586 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3587 | |
07f07615 PB |
3588 | Coroutine *co; |
3589 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3590 | |
07f07615 PB |
3591 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
3592 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); | |
3593 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3594 | |
016f5cf6 AG |
3595 | return &acb->common; |
3596 | } | |
3597 | ||
4265d620 PB |
3598 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3599 | { | |
3600 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3601 | BlockDriverState *bs = acb->common.bs; | |
3602 | ||
3603 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3604 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3605 | qemu_bh_schedule(acb->bh); | |
3606 | } | |
3607 | ||
3608 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3609 | int64_t sector_num, int nb_sectors, | |
3610 | BlockDriverCompletionFunc *cb, void *opaque) | |
3611 | { | |
3612 | Coroutine *co; | |
3613 | BlockDriverAIOCBCoroutine *acb; | |
3614 | ||
3615 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3616 | ||
3617 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3618 | acb->req.sector = sector_num; | |
3619 | acb->req.nb_sectors = nb_sectors; | |
3620 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
3621 | qemu_coroutine_enter(co, acb); | |
3622 | ||
3623 | return &acb->common; | |
3624 | } | |
3625 | ||
ea2384d3 FB |
3626 | void bdrv_init(void) |
3627 | { | |
5efa9d5a | 3628 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3629 | } |
ce1a14dc | 3630 | |
eb852011 MA |
3631 | void bdrv_init_with_whitelist(void) |
3632 | { | |
3633 | use_bdrv_whitelist = 1; | |
3634 | bdrv_init(); | |
3635 | } | |
3636 | ||
c16b5a2c CH |
3637 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
3638 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 3639 | { |
ce1a14dc PB |
3640 | BlockDriverAIOCB *acb; |
3641 | ||
6bbff9a0 AL |
3642 | if (pool->free_aiocb) { |
3643 | acb = pool->free_aiocb; | |
3644 | pool->free_aiocb = acb->next; | |
ce1a14dc | 3645 | } else { |
7267c094 | 3646 | acb = g_malloc0(pool->aiocb_size); |
6bbff9a0 | 3647 | acb->pool = pool; |
ce1a14dc PB |
3648 | } |
3649 | acb->bs = bs; | |
3650 | acb->cb = cb; | |
3651 | acb->opaque = opaque; | |
3652 | return acb; | |
3653 | } | |
3654 | ||
3655 | void qemu_aio_release(void *p) | |
3656 | { | |
6bbff9a0 AL |
3657 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
3658 | AIOPool *pool = acb->pool; | |
3659 | acb->next = pool->free_aiocb; | |
3660 | pool->free_aiocb = acb; | |
ce1a14dc | 3661 | } |
19cb3738 | 3662 | |
f9f05dc5 KW |
3663 | /**************************************************************/ |
3664 | /* Coroutine block device emulation */ | |
3665 | ||
3666 | typedef struct CoroutineIOCompletion { | |
3667 | Coroutine *coroutine; | |
3668 | int ret; | |
3669 | } CoroutineIOCompletion; | |
3670 | ||
3671 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3672 | { | |
3673 | CoroutineIOCompletion *co = opaque; | |
3674 | ||
3675 | co->ret = ret; | |
3676 | qemu_coroutine_enter(co->coroutine, NULL); | |
3677 | } | |
3678 | ||
3679 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3680 | int nb_sectors, QEMUIOVector *iov, | |
3681 | bool is_write) | |
3682 | { | |
3683 | CoroutineIOCompletion co = { | |
3684 | .coroutine = qemu_coroutine_self(), | |
3685 | }; | |
3686 | BlockDriverAIOCB *acb; | |
3687 | ||
3688 | if (is_write) { | |
a652d160 SH |
3689 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3690 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3691 | } else { |
a652d160 SH |
3692 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3693 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3694 | } |
3695 | ||
59370aaa | 3696 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3697 | if (!acb) { |
3698 | return -EIO; | |
3699 | } | |
3700 | qemu_coroutine_yield(); | |
3701 | ||
3702 | return co.ret; | |
3703 | } | |
3704 | ||
3705 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
3706 | int64_t sector_num, int nb_sectors, | |
3707 | QEMUIOVector *iov) | |
3708 | { | |
3709 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
3710 | } | |
3711 | ||
3712 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
3713 | int64_t sector_num, int nb_sectors, | |
3714 | QEMUIOVector *iov) | |
3715 | { | |
3716 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
3717 | } | |
3718 | ||
07f07615 | 3719 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 3720 | { |
07f07615 PB |
3721 | RwCo *rwco = opaque; |
3722 | ||
3723 | rwco->ret = bdrv_co_flush(rwco->bs); | |
3724 | } | |
3725 | ||
3726 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
3727 | { | |
eb489bb1 KW |
3728 | int ret; |
3729 | ||
29cdb251 | 3730 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 3731 | return 0; |
eb489bb1 KW |
3732 | } |
3733 | ||
ca716364 | 3734 | /* Write back cached data to the OS even with cache=unsafe */ |
eb489bb1 KW |
3735 | if (bs->drv->bdrv_co_flush_to_os) { |
3736 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
3737 | if (ret < 0) { | |
3738 | return ret; | |
3739 | } | |
3740 | } | |
3741 | ||
ca716364 KW |
3742 | /* But don't actually force it to the disk with cache=unsafe */ |
3743 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
3744 | return 0; | |
3745 | } | |
3746 | ||
eb489bb1 | 3747 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 3748 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
3749 | } else if (bs->drv->bdrv_aio_flush) { |
3750 | BlockDriverAIOCB *acb; | |
3751 | CoroutineIOCompletion co = { | |
3752 | .coroutine = qemu_coroutine_self(), | |
3753 | }; | |
3754 | ||
3755 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
3756 | if (acb == NULL) { | |
29cdb251 | 3757 | ret = -EIO; |
07f07615 PB |
3758 | } else { |
3759 | qemu_coroutine_yield(); | |
29cdb251 | 3760 | ret = co.ret; |
07f07615 | 3761 | } |
07f07615 PB |
3762 | } else { |
3763 | /* | |
3764 | * Some block drivers always operate in either writethrough or unsafe | |
3765 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
3766 | * know how the server works (because the behaviour is hardcoded or | |
3767 | * depends on server-side configuration), so we can't ensure that | |
3768 | * everything is safe on disk. Returning an error doesn't work because | |
3769 | * that would break guests even if the server operates in writethrough | |
3770 | * mode. | |
3771 | * | |
3772 | * Let's hope the user knows what he's doing. | |
3773 | */ | |
29cdb251 | 3774 | ret = 0; |
07f07615 | 3775 | } |
29cdb251 PB |
3776 | if (ret < 0) { |
3777 | return ret; | |
3778 | } | |
3779 | ||
3780 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
3781 | * in the case of cache=unsafe, so there are no useless flushes. | |
3782 | */ | |
3783 | return bdrv_co_flush(bs->file); | |
07f07615 PB |
3784 | } |
3785 | ||
0f15423c AL |
3786 | void bdrv_invalidate_cache(BlockDriverState *bs) |
3787 | { | |
3788 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
3789 | bs->drv->bdrv_invalidate_cache(bs); | |
3790 | } | |
3791 | } | |
3792 | ||
3793 | void bdrv_invalidate_cache_all(void) | |
3794 | { | |
3795 | BlockDriverState *bs; | |
3796 | ||
3797 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
3798 | bdrv_invalidate_cache(bs); | |
3799 | } | |
3800 | } | |
3801 | ||
07789269 BC |
3802 | void bdrv_clear_incoming_migration_all(void) |
3803 | { | |
3804 | BlockDriverState *bs; | |
3805 | ||
3806 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
3807 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
3808 | } | |
3809 | } | |
3810 | ||
07f07615 PB |
3811 | int bdrv_flush(BlockDriverState *bs) |
3812 | { | |
3813 | Coroutine *co; | |
3814 | RwCo rwco = { | |
3815 | .bs = bs, | |
3816 | .ret = NOT_DONE, | |
e7a8a783 | 3817 | }; |
e7a8a783 | 3818 | |
07f07615 PB |
3819 | if (qemu_in_coroutine()) { |
3820 | /* Fast-path if already in coroutine context */ | |
3821 | bdrv_flush_co_entry(&rwco); | |
3822 | } else { | |
3823 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
3824 | qemu_coroutine_enter(co, &rwco); | |
3825 | while (rwco.ret == NOT_DONE) { | |
3826 | qemu_aio_wait(); | |
3827 | } | |
e7a8a783 | 3828 | } |
07f07615 PB |
3829 | |
3830 | return rwco.ret; | |
e7a8a783 KW |
3831 | } |
3832 | ||
4265d620 PB |
3833 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
3834 | { | |
3835 | RwCo *rwco = opaque; | |
3836 | ||
3837 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
3838 | } | |
3839 | ||
3840 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
3841 | int nb_sectors) | |
3842 | { | |
3843 | if (!bs->drv) { | |
3844 | return -ENOMEDIUM; | |
3845 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
3846 | return -EIO; | |
3847 | } else if (bs->read_only) { | |
3848 | return -EROFS; | |
3849 | } else if (bs->drv->bdrv_co_discard) { | |
3850 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); | |
3851 | } else if (bs->drv->bdrv_aio_discard) { | |
3852 | BlockDriverAIOCB *acb; | |
3853 | CoroutineIOCompletion co = { | |
3854 | .coroutine = qemu_coroutine_self(), | |
3855 | }; | |
3856 | ||
3857 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
3858 | bdrv_co_io_em_complete, &co); | |
3859 | if (acb == NULL) { | |
3860 | return -EIO; | |
3861 | } else { | |
3862 | qemu_coroutine_yield(); | |
3863 | return co.ret; | |
3864 | } | |
4265d620 PB |
3865 | } else { |
3866 | return 0; | |
3867 | } | |
3868 | } | |
3869 | ||
3870 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
3871 | { | |
3872 | Coroutine *co; | |
3873 | RwCo rwco = { | |
3874 | .bs = bs, | |
3875 | .sector_num = sector_num, | |
3876 | .nb_sectors = nb_sectors, | |
3877 | .ret = NOT_DONE, | |
3878 | }; | |
3879 | ||
3880 | if (qemu_in_coroutine()) { | |
3881 | /* Fast-path if already in coroutine context */ | |
3882 | bdrv_discard_co_entry(&rwco); | |
3883 | } else { | |
3884 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
3885 | qemu_coroutine_enter(co, &rwco); | |
3886 | while (rwco.ret == NOT_DONE) { | |
3887 | qemu_aio_wait(); | |
3888 | } | |
3889 | } | |
3890 | ||
3891 | return rwco.ret; | |
3892 | } | |
3893 | ||
19cb3738 FB |
3894 | /**************************************************************/ |
3895 | /* removable device support */ | |
3896 | ||
3897 | /** | |
3898 | * Return TRUE if the media is present | |
3899 | */ | |
3900 | int bdrv_is_inserted(BlockDriverState *bs) | |
3901 | { | |
3902 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 3903 | |
19cb3738 FB |
3904 | if (!drv) |
3905 | return 0; | |
3906 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
3907 | return 1; |
3908 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
3909 | } |
3910 | ||
3911 | /** | |
8e49ca46 MA |
3912 | * Return whether the media changed since the last call to this |
3913 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
3914 | */ |
3915 | int bdrv_media_changed(BlockDriverState *bs) | |
3916 | { | |
3917 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3918 | |
8e49ca46 MA |
3919 | if (drv && drv->bdrv_media_changed) { |
3920 | return drv->bdrv_media_changed(bs); | |
3921 | } | |
3922 | return -ENOTSUP; | |
19cb3738 FB |
3923 | } |
3924 | ||
3925 | /** | |
3926 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
3927 | */ | |
f36f3949 | 3928 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
3929 | { |
3930 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3931 | |
822e1cd1 MA |
3932 | if (drv && drv->bdrv_eject) { |
3933 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 3934 | } |
6f382ed2 LC |
3935 | |
3936 | if (bs->device_name[0] != '\0') { | |
3937 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
3938 | } | |
19cb3738 FB |
3939 | } |
3940 | ||
19cb3738 FB |
3941 | /** |
3942 | * Lock or unlock the media (if it is locked, the user won't be able | |
3943 | * to eject it manually). | |
3944 | */ | |
025e849a | 3945 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
3946 | { |
3947 | BlockDriver *drv = bs->drv; | |
3948 | ||
025e849a | 3949 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 3950 | |
025e849a MA |
3951 | if (drv && drv->bdrv_lock_medium) { |
3952 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
3953 | } |
3954 | } | |
985a03b0 TS |
3955 | |
3956 | /* needed for generic scsi interface */ | |
3957 | ||
3958 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
3959 | { | |
3960 | BlockDriver *drv = bs->drv; | |
3961 | ||
3962 | if (drv && drv->bdrv_ioctl) | |
3963 | return drv->bdrv_ioctl(bs, req, buf); | |
3964 | return -ENOTSUP; | |
3965 | } | |
7d780669 | 3966 | |
221f715d AL |
3967 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
3968 | unsigned long int req, void *buf, | |
3969 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 3970 | { |
221f715d | 3971 | BlockDriver *drv = bs->drv; |
7d780669 | 3972 | |
221f715d AL |
3973 | if (drv && drv->bdrv_aio_ioctl) |
3974 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
3975 | return NULL; | |
7d780669 | 3976 | } |
e268ca52 | 3977 | |
7b6f9300 MA |
3978 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
3979 | { | |
3980 | bs->buffer_alignment = align; | |
3981 | } | |
7cd1e32a | 3982 | |
e268ca52 AL |
3983 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
3984 | { | |
3985 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
3986 | } | |
7cd1e32a | 3987 | |
3988 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
3989 | { | |
3990 | int64_t bitmap_size; | |
a55eb92c | 3991 | |
aaa0eb75 | 3992 | bs->dirty_count = 0; |
a55eb92c | 3993 | if (enable) { |
c6d22830 JK |
3994 | if (!bs->dirty_bitmap) { |
3995 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
71df14fc PB |
3996 | BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG - 1; |
3997 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG; | |
a55eb92c | 3998 | |
71df14fc | 3999 | bs->dirty_bitmap = g_new0(unsigned long, bitmap_size); |
a55eb92c | 4000 | } |
7cd1e32a | 4001 | } else { |
c6d22830 | 4002 | if (bs->dirty_bitmap) { |
7267c094 | 4003 | g_free(bs->dirty_bitmap); |
c6d22830 | 4004 | bs->dirty_bitmap = NULL; |
a55eb92c | 4005 | } |
7cd1e32a | 4006 | } |
4007 | } | |
4008 | ||
4009 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
4010 | { | |
6ea44308 | 4011 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 4012 | |
c6d22830 JK |
4013 | if (bs->dirty_bitmap && |
4014 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
6d59fec1 MT |
4015 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
4016 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
7cd1e32a | 4017 | } else { |
4018 | return 0; | |
4019 | } | |
4020 | } | |
4021 | ||
a55eb92c JK |
4022 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
4023 | int nr_sectors) | |
7cd1e32a | 4024 | { |
4025 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
4026 | } | |
aaa0eb75 LS |
4027 | |
4028 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
4029 | { | |
4030 | return bs->dirty_count; | |
4031 | } | |
f88e1a42 | 4032 | |
db593f25 MT |
4033 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4034 | { | |
4035 | assert(bs->in_use != in_use); | |
4036 | bs->in_use = in_use; | |
4037 | } | |
4038 | ||
4039 | int bdrv_in_use(BlockDriverState *bs) | |
4040 | { | |
4041 | return bs->in_use; | |
4042 | } | |
4043 | ||
28a7282a LC |
4044 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4045 | { | |
d6bf279e | 4046 | bs->iostatus_enabled = true; |
58e21ef5 | 4047 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4048 | } |
4049 | ||
4050 | /* The I/O status is only enabled if the drive explicitly | |
4051 | * enables it _and_ the VM is configured to stop on errors */ | |
4052 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4053 | { | |
d6bf279e | 4054 | return (bs->iostatus_enabled && |
28a7282a LC |
4055 | (bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || |
4056 | bs->on_write_error == BLOCK_ERR_STOP_ANY || | |
4057 | bs->on_read_error == BLOCK_ERR_STOP_ANY)); | |
4058 | } | |
4059 | ||
4060 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4061 | { | |
d6bf279e | 4062 | bs->iostatus_enabled = false; |
28a7282a LC |
4063 | } |
4064 | ||
4065 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4066 | { | |
4067 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4068 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4069 | } |
4070 | } | |
4071 | ||
4072 | /* XXX: Today this is set by device models because it makes the implementation | |
4073 | quite simple. However, the block layer knows about the error, so it's | |
4074 | possible to implement this without device models being involved */ | |
4075 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) | |
4076 | { | |
58e21ef5 LC |
4077 | if (bdrv_iostatus_is_enabled(bs) && |
4078 | bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
28a7282a | 4079 | assert(error >= 0); |
58e21ef5 LC |
4080 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4081 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4082 | } |
4083 | } | |
4084 | ||
a597e79c CH |
4085 | void |
4086 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4087 | enum BlockAcctType type) | |
4088 | { | |
4089 | assert(type < BDRV_MAX_IOTYPE); | |
4090 | ||
4091 | cookie->bytes = bytes; | |
c488c7f6 | 4092 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4093 | cookie->type = type; |
4094 | } | |
4095 | ||
4096 | void | |
4097 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4098 | { | |
4099 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4100 | ||
4101 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4102 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4103 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4104 | } |
4105 | ||
f88e1a42 JS |
4106 | int bdrv_img_create(const char *filename, const char *fmt, |
4107 | const char *base_filename, const char *base_fmt, | |
4108 | char *options, uint64_t img_size, int flags) | |
4109 | { | |
4110 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4111 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4112 | BlockDriverState *bs = NULL; |
4113 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4114 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4115 | int ret = 0; |
4116 | ||
4117 | /* Find driver and parse its options */ | |
4118 | drv = bdrv_find_format(fmt); | |
4119 | if (!drv) { | |
4120 | error_report("Unknown file format '%s'", fmt); | |
4f70f249 | 4121 | ret = -EINVAL; |
f88e1a42 JS |
4122 | goto out; |
4123 | } | |
4124 | ||
4125 | proto_drv = bdrv_find_protocol(filename); | |
4126 | if (!proto_drv) { | |
4127 | error_report("Unknown protocol '%s'", filename); | |
4f70f249 | 4128 | ret = -EINVAL; |
f88e1a42 JS |
4129 | goto out; |
4130 | } | |
4131 | ||
4132 | create_options = append_option_parameters(create_options, | |
4133 | drv->create_options); | |
4134 | create_options = append_option_parameters(create_options, | |
4135 | proto_drv->create_options); | |
4136 | ||
4137 | /* Create parameter list with default values */ | |
4138 | param = parse_option_parameters("", create_options, param); | |
4139 | ||
4140 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4141 | ||
4142 | /* Parse -o options */ | |
4143 | if (options) { | |
4144 | param = parse_option_parameters(options, create_options, param); | |
4145 | if (param == NULL) { | |
4146 | error_report("Invalid options for file format '%s'.", fmt); | |
4f70f249 | 4147 | ret = -EINVAL; |
f88e1a42 JS |
4148 | goto out; |
4149 | } | |
4150 | } | |
4151 | ||
4152 | if (base_filename) { | |
4153 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4154 | base_filename)) { | |
4155 | error_report("Backing file not supported for file format '%s'", | |
4156 | fmt); | |
4f70f249 | 4157 | ret = -EINVAL; |
f88e1a42 JS |
4158 | goto out; |
4159 | } | |
4160 | } | |
4161 | ||
4162 | if (base_fmt) { | |
4163 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
4164 | error_report("Backing file format not supported for file " | |
4165 | "format '%s'", fmt); | |
4f70f249 | 4166 | ret = -EINVAL; |
f88e1a42 JS |
4167 | goto out; |
4168 | } | |
4169 | } | |
4170 | ||
792da93a JS |
4171 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4172 | if (backing_file && backing_file->value.s) { | |
4173 | if (!strcmp(filename, backing_file->value.s)) { | |
4174 | error_report("Error: Trying to create an image with the " | |
4175 | "same filename as the backing file"); | |
4f70f249 | 4176 | ret = -EINVAL; |
792da93a JS |
4177 | goto out; |
4178 | } | |
4179 | } | |
4180 | ||
f88e1a42 JS |
4181 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4182 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4183 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4184 | if (!backing_drv) { | |
f88e1a42 JS |
4185 | error_report("Unknown backing file format '%s'", |
4186 | backing_fmt->value.s); | |
4f70f249 | 4187 | ret = -EINVAL; |
f88e1a42 JS |
4188 | goto out; |
4189 | } | |
4190 | } | |
4191 | ||
4192 | // The size for the image must always be specified, with one exception: | |
4193 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4194 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4195 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4196 | if (backing_file && backing_file->value.s) { |
4197 | uint64_t size; | |
f88e1a42 | 4198 | char buf[32]; |
63090dac PB |
4199 | int back_flags; |
4200 | ||
4201 | /* backing files always opened read-only */ | |
4202 | back_flags = | |
4203 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4204 | |
f88e1a42 JS |
4205 | bs = bdrv_new(""); |
4206 | ||
63090dac | 4207 | ret = bdrv_open(bs, backing_file->value.s, back_flags, backing_drv); |
f88e1a42 | 4208 | if (ret < 0) { |
96df67d1 | 4209 | error_report("Could not open '%s'", backing_file->value.s); |
f88e1a42 JS |
4210 | goto out; |
4211 | } | |
4212 | bdrv_get_geometry(bs, &size); | |
4213 | size *= 512; | |
4214 | ||
4215 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4216 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4217 | } else { | |
4218 | error_report("Image creation needs a size parameter"); | |
4f70f249 | 4219 | ret = -EINVAL; |
f88e1a42 JS |
4220 | goto out; |
4221 | } | |
4222 | } | |
4223 | ||
4224 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4225 | print_option_parameters(param); | |
4226 | puts(""); | |
4227 | ||
4228 | ret = bdrv_create(drv, filename, param); | |
4229 | ||
4230 | if (ret < 0) { | |
4231 | if (ret == -ENOTSUP) { | |
4232 | error_report("Formatting or formatting option not supported for " | |
4233 | "file format '%s'", fmt); | |
4234 | } else if (ret == -EFBIG) { | |
4235 | error_report("The image size is too large for file format '%s'", | |
4236 | fmt); | |
4237 | } else { | |
4238 | error_report("%s: error while creating %s: %s", filename, fmt, | |
4239 | strerror(-ret)); | |
4240 | } | |
4241 | } | |
4242 | ||
4243 | out: | |
4244 | free_option_parameters(create_options); | |
4245 | free_option_parameters(param); | |
4246 | ||
4247 | if (bs) { | |
4248 | bdrv_delete(bs); | |
4249 | } | |
4f70f249 JS |
4250 | |
4251 | return ret; | |
f88e1a42 | 4252 | } |
eeec61f2 SH |
4253 | |
4254 | void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, | |
c83c66c3 SH |
4255 | int64_t speed, BlockDriverCompletionFunc *cb, |
4256 | void *opaque, Error **errp) | |
eeec61f2 SH |
4257 | { |
4258 | BlockJob *job; | |
4259 | ||
4260 | if (bs->job || bdrv_in_use(bs)) { | |
fd7f8c65 | 4261 | error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
eeec61f2 SH |
4262 | return NULL; |
4263 | } | |
4264 | bdrv_set_in_use(bs, 1); | |
4265 | ||
4266 | job = g_malloc0(job_type->instance_size); | |
4267 | job->job_type = job_type; | |
4268 | job->bs = bs; | |
4269 | job->cb = cb; | |
4270 | job->opaque = opaque; | |
4513eafe | 4271 | job->busy = true; |
eeec61f2 | 4272 | bs->job = job; |
c83c66c3 SH |
4273 | |
4274 | /* Only set speed when necessary to avoid NotSupported error */ | |
4275 | if (speed != 0) { | |
4276 | Error *local_err = NULL; | |
4277 | ||
4278 | block_job_set_speed(job, speed, &local_err); | |
4279 | if (error_is_set(&local_err)) { | |
4280 | bs->job = NULL; | |
4281 | g_free(job); | |
4282 | bdrv_set_in_use(bs, 0); | |
4283 | error_propagate(errp, local_err); | |
4284 | return NULL; | |
4285 | } | |
4286 | } | |
eeec61f2 SH |
4287 | return job; |
4288 | } | |
4289 | ||
4290 | void block_job_complete(BlockJob *job, int ret) | |
4291 | { | |
4292 | BlockDriverState *bs = job->bs; | |
4293 | ||
4294 | assert(bs->job == job); | |
4295 | job->cb(job->opaque, ret); | |
4296 | bs->job = NULL; | |
4297 | g_free(job); | |
4298 | bdrv_set_in_use(bs, 0); | |
4299 | } | |
4300 | ||
882ec7ce | 4301 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
eeec61f2 | 4302 | { |
9e6636c7 | 4303 | Error *local_err = NULL; |
9f25eccc | 4304 | |
eeec61f2 | 4305 | if (!job->job_type->set_speed) { |
9e6636c7 SH |
4306 | error_set(errp, QERR_NOT_SUPPORTED); |
4307 | return; | |
eeec61f2 | 4308 | } |
882ec7ce | 4309 | job->job_type->set_speed(job, speed, &local_err); |
9e6636c7 SH |
4310 | if (error_is_set(&local_err)) { |
4311 | error_propagate(errp, local_err); | |
4312 | return; | |
9f25eccc | 4313 | } |
9e6636c7 | 4314 | |
882ec7ce | 4315 | job->speed = speed; |
eeec61f2 SH |
4316 | } |
4317 | ||
4318 | void block_job_cancel(BlockJob *job) | |
4319 | { | |
4320 | job->cancelled = true; | |
fa4478d5 PB |
4321 | if (job->co && !job->busy) { |
4322 | qemu_coroutine_enter(job->co, NULL); | |
4323 | } | |
eeec61f2 SH |
4324 | } |
4325 | ||
4326 | bool block_job_is_cancelled(BlockJob *job) | |
4327 | { | |
4328 | return job->cancelled; | |
4329 | } | |
3e914655 | 4330 | |
fa4478d5 PB |
4331 | struct BlockCancelData { |
4332 | BlockJob *job; | |
4333 | BlockDriverCompletionFunc *cb; | |
4334 | void *opaque; | |
4335 | bool cancelled; | |
4336 | int ret; | |
4337 | }; | |
4338 | ||
4339 | static void block_job_cancel_cb(void *opaque, int ret) | |
3e914655 | 4340 | { |
fa4478d5 PB |
4341 | struct BlockCancelData *data = opaque; |
4342 | ||
4343 | data->cancelled = block_job_is_cancelled(data->job); | |
4344 | data->ret = ret; | |
4345 | data->cb(data->opaque, ret); | |
4346 | } | |
4347 | ||
4348 | int block_job_cancel_sync(BlockJob *job) | |
4349 | { | |
4350 | struct BlockCancelData data; | |
3e914655 PB |
4351 | BlockDriverState *bs = job->bs; |
4352 | ||
4353 | assert(bs->job == job); | |
fa4478d5 PB |
4354 | |
4355 | /* Set up our own callback to store the result and chain to | |
4356 | * the original callback. | |
4357 | */ | |
4358 | data.job = job; | |
4359 | data.cb = job->cb; | |
4360 | data.opaque = job->opaque; | |
4361 | data.ret = -EINPROGRESS; | |
4362 | job->cb = block_job_cancel_cb; | |
4363 | job->opaque = &data; | |
3e914655 | 4364 | block_job_cancel(job); |
fa4478d5 | 4365 | while (data.ret == -EINPROGRESS) { |
3e914655 PB |
4366 | qemu_aio_wait(); |
4367 | } | |
fa4478d5 | 4368 | return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret; |
3e914655 | 4369 | } |
4513eafe PB |
4370 | |
4371 | void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns) | |
4372 | { | |
4373 | /* Check cancellation *before* setting busy = false, too! */ | |
4374 | if (!block_job_is_cancelled(job)) { | |
4375 | job->busy = false; | |
4376 | co_sleep_ns(clock, ns); | |
4377 | job->busy = true; | |
4378 | } | |
4379 | } |