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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 | ||
a9fc4408 PB |
1030 | /* dirty bitmap */ |
1031 | tmp.dirty_count = bs_top->dirty_count; | |
1032 | tmp.dirty_bitmap = bs_top->dirty_bitmap; | |
1033 | assert(bs_new->dirty_bitmap == NULL); | |
1034 | ||
1035 | /* job */ | |
1036 | tmp.in_use = bs_top->in_use; | |
1037 | tmp.job = bs_top->job; | |
1038 | assert(bs_new->job == NULL); | |
1039 | ||
8802d1fd JC |
1040 | /* keep the same entry in bdrv_states */ |
1041 | pstrcpy(tmp.device_name, sizeof(tmp.device_name), bs_top->device_name); | |
1042 | tmp.list = bs_top->list; | |
1043 | ||
1044 | /* The contents of 'tmp' will become bs_top, as we are | |
1045 | * swapping bs_new and bs_top contents. */ | |
1046 | tmp.backing_hd = bs_new; | |
1047 | pstrcpy(tmp.backing_file, sizeof(tmp.backing_file), bs_top->filename); | |
f8d6bba1 MA |
1048 | pstrcpy(tmp.backing_format, sizeof(tmp.backing_format), |
1049 | bs_top->drv ? bs_top->drv->format_name : ""); | |
8802d1fd JC |
1050 | |
1051 | /* swap contents of the fixed new bs and the current top */ | |
1052 | *bs_new = *bs_top; | |
1053 | *bs_top = tmp; | |
1054 | ||
f6801b83 JC |
1055 | /* device_name[] was carried over from the old bs_top. bs_new |
1056 | * shouldn't be in bdrv_states, so we need to make device_name[] | |
1057 | * reflect the anonymity of bs_new | |
1058 | */ | |
1059 | bs_new->device_name[0] = '\0'; | |
1060 | ||
8802d1fd JC |
1061 | /* clear the copied fields in the new backing file */ |
1062 | bdrv_detach_dev(bs_new, bs_new->dev); | |
1063 | ||
a9fc4408 PB |
1064 | bs_new->job = NULL; |
1065 | bs_new->in_use = 0; | |
1066 | bs_new->dirty_bitmap = NULL; | |
1067 | bs_new->dirty_count = 0; | |
1068 | ||
8802d1fd JC |
1069 | qemu_co_queue_init(&bs_new->throttled_reqs); |
1070 | memset(&bs_new->io_base, 0, sizeof(bs_new->io_base)); | |
1071 | memset(&bs_new->io_limits, 0, sizeof(bs_new->io_limits)); | |
1072 | bdrv_iostatus_disable(bs_new); | |
1073 | ||
1074 | /* we don't use bdrv_io_limits_disable() for this, because we don't want | |
1075 | * to affect or delete the block_timer, as it has been moved to bs_top */ | |
1076 | bs_new->io_limits_enabled = false; | |
1077 | bs_new->block_timer = NULL; | |
1078 | bs_new->slice_time = 0; | |
1079 | bs_new->slice_start = 0; | |
1080 | bs_new->slice_end = 0; | |
e023b2e2 PB |
1081 | |
1082 | bdrv_rebind(bs_new); | |
1083 | bdrv_rebind(bs_top); | |
8802d1fd JC |
1084 | } |
1085 | ||
b338082b FB |
1086 | void bdrv_delete(BlockDriverState *bs) |
1087 | { | |
fa879d62 | 1088 | assert(!bs->dev); |
3e914655 PB |
1089 | assert(!bs->job); |
1090 | assert(!bs->in_use); | |
18846dee | 1091 | |
1b7bdbc1 | 1092 | /* remove from list, if necessary */ |
d22b2f41 | 1093 | bdrv_make_anon(bs); |
34c6f050 | 1094 | |
b338082b | 1095 | bdrv_close(bs); |
66f82cee | 1096 | |
f9092b10 | 1097 | assert(bs != bs_snapshots); |
7267c094 | 1098 | g_free(bs); |
fc01f7e7 FB |
1099 | } |
1100 | ||
fa879d62 MA |
1101 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1102 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1103 | { |
fa879d62 | 1104 | if (bs->dev) { |
18846dee MA |
1105 | return -EBUSY; |
1106 | } | |
fa879d62 | 1107 | bs->dev = dev; |
28a7282a | 1108 | bdrv_iostatus_reset(bs); |
18846dee MA |
1109 | return 0; |
1110 | } | |
1111 | ||
fa879d62 MA |
1112 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1113 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1114 | { |
fa879d62 MA |
1115 | if (bdrv_attach_dev(bs, dev) < 0) { |
1116 | abort(); | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1121 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1122 | { | |
1123 | assert(bs->dev == dev); | |
1124 | bs->dev = NULL; | |
0e49de52 MA |
1125 | bs->dev_ops = NULL; |
1126 | bs->dev_opaque = NULL; | |
29e05f20 | 1127 | bs->buffer_alignment = 512; |
18846dee MA |
1128 | } |
1129 | ||
fa879d62 MA |
1130 | /* TODO change to return DeviceState * when all users are qdevified */ |
1131 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1132 | { |
fa879d62 | 1133 | return bs->dev; |
18846dee MA |
1134 | } |
1135 | ||
0e49de52 MA |
1136 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1137 | void *opaque) | |
1138 | { | |
1139 | bs->dev_ops = ops; | |
1140 | bs->dev_opaque = opaque; | |
2c6942fa MA |
1141 | if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) { |
1142 | bs_snapshots = NULL; | |
1143 | } | |
0e49de52 MA |
1144 | } |
1145 | ||
329c0a48 LC |
1146 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1147 | BlockQMPEventAction action, int is_read) | |
1148 | { | |
1149 | QObject *data; | |
1150 | const char *action_str; | |
1151 | ||
1152 | switch (action) { | |
1153 | case BDRV_ACTION_REPORT: | |
1154 | action_str = "report"; | |
1155 | break; | |
1156 | case BDRV_ACTION_IGNORE: | |
1157 | action_str = "ignore"; | |
1158 | break; | |
1159 | case BDRV_ACTION_STOP: | |
1160 | action_str = "stop"; | |
1161 | break; | |
1162 | default: | |
1163 | abort(); | |
1164 | } | |
1165 | ||
1166 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1167 | bdrv->device_name, | |
1168 | action_str, | |
1169 | is_read ? "read" : "write"); | |
1170 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1171 | ||
1172 | qobject_decref(data); | |
1173 | } | |
1174 | ||
6f382ed2 LC |
1175 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1176 | { | |
1177 | QObject *data; | |
1178 | ||
1179 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1180 | bdrv_get_device_name(bs), ejected); | |
1181 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1182 | ||
1183 | qobject_decref(data); | |
1184 | } | |
1185 | ||
7d4b4ba5 | 1186 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1187 | { |
145feb17 | 1188 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1189 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1190 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1191 | if (tray_was_closed) { |
1192 | /* tray open */ | |
1193 | bdrv_emit_qmp_eject_event(bs, true); | |
1194 | } | |
1195 | if (load) { | |
1196 | /* tray close */ | |
1197 | bdrv_emit_qmp_eject_event(bs, false); | |
1198 | } | |
145feb17 MA |
1199 | } |
1200 | } | |
1201 | ||
2c6942fa MA |
1202 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1203 | { | |
1204 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1205 | } | |
1206 | ||
025ccaa7 PB |
1207 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1208 | { | |
1209 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1210 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1211 | } | |
1212 | } | |
1213 | ||
e4def80b MA |
1214 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1215 | { | |
1216 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1217 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1218 | } | |
1219 | return false; | |
1220 | } | |
1221 | ||
145feb17 MA |
1222 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1223 | { | |
1224 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1225 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1226 | } |
1227 | } | |
1228 | ||
f107639a MA |
1229 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1230 | { | |
1231 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1232 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1233 | } | |
1234 | return false; | |
1235 | } | |
1236 | ||
e97fc193 AL |
1237 | /* |
1238 | * Run consistency checks on an image | |
1239 | * | |
e076f338 | 1240 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1241 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1242 | * check are stored in res. |
e97fc193 | 1243 | */ |
4534ff54 | 1244 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1245 | { |
1246 | if (bs->drv->bdrv_check == NULL) { | |
1247 | return -ENOTSUP; | |
1248 | } | |
1249 | ||
e076f338 | 1250 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1251 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1252 | } |
1253 | ||
8a426614 KW |
1254 | #define COMMIT_BUF_SECTORS 2048 |
1255 | ||
33e3963e FB |
1256 | /* commit COW file into the raw image */ |
1257 | int bdrv_commit(BlockDriverState *bs) | |
1258 | { | |
19cb3738 | 1259 | BlockDriver *drv = bs->drv; |
ee181196 | 1260 | BlockDriver *backing_drv; |
8a426614 KW |
1261 | int64_t sector, total_sectors; |
1262 | int n, ro, open_flags; | |
4dca4b63 | 1263 | int ret = 0, rw_ret = 0; |
8a426614 | 1264 | uint8_t *buf; |
4dca4b63 NS |
1265 | char filename[1024]; |
1266 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 1267 | |
19cb3738 FB |
1268 | if (!drv) |
1269 | return -ENOMEDIUM; | |
4dca4b63 NS |
1270 | |
1271 | if (!bs->backing_hd) { | |
1272 | return -ENOTSUP; | |
33e3963e FB |
1273 | } |
1274 | ||
4dca4b63 NS |
1275 | if (bs->backing_hd->keep_read_only) { |
1276 | return -EACCES; | |
1277 | } | |
ee181196 | 1278 | |
2d3735d3 SH |
1279 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1280 | return -EBUSY; | |
1281 | } | |
1282 | ||
ee181196 | 1283 | backing_drv = bs->backing_hd->drv; |
4dca4b63 NS |
1284 | ro = bs->backing_hd->read_only; |
1285 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
1286 | open_flags = bs->backing_hd->open_flags; | |
1287 | ||
1288 | if (ro) { | |
1289 | /* re-open as RW */ | |
1290 | bdrv_delete(bs->backing_hd); | |
1291 | bs->backing_hd = NULL; | |
1292 | bs_rw = bdrv_new(""); | |
ee181196 KW |
1293 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
1294 | backing_drv); | |
4dca4b63 NS |
1295 | if (rw_ret < 0) { |
1296 | bdrv_delete(bs_rw); | |
1297 | /* try to re-open read-only */ | |
1298 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1299 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1300 | backing_drv); | |
4dca4b63 NS |
1301 | if (ret < 0) { |
1302 | bdrv_delete(bs_ro); | |
1303 | /* drive not functional anymore */ | |
1304 | bs->drv = NULL; | |
1305 | return ret; | |
1306 | } | |
1307 | bs->backing_hd = bs_ro; | |
1308 | return rw_ret; | |
1309 | } | |
1310 | bs->backing_hd = bs_rw; | |
ea2384d3 | 1311 | } |
33e3963e | 1312 | |
6ea44308 | 1313 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1314 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1315 | |
1316 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1317 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1318 | |
1319 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1320 | ret = -EIO; | |
1321 | goto ro_cleanup; | |
1322 | } | |
1323 | ||
1324 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1325 | ret = -EIO; | |
1326 | goto ro_cleanup; | |
1327 | } | |
ea2384d3 | 1328 | } |
33e3963e | 1329 | } |
95389c86 | 1330 | |
1d44952f CH |
1331 | if (drv->bdrv_make_empty) { |
1332 | ret = drv->bdrv_make_empty(bs); | |
1333 | bdrv_flush(bs); | |
1334 | } | |
95389c86 | 1335 | |
3f5075ae CH |
1336 | /* |
1337 | * Make sure all data we wrote to the backing device is actually | |
1338 | * stable on disk. | |
1339 | */ | |
1340 | if (bs->backing_hd) | |
1341 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1342 | |
1343 | ro_cleanup: | |
7267c094 | 1344 | g_free(buf); |
4dca4b63 NS |
1345 | |
1346 | if (ro) { | |
1347 | /* re-open as RO */ | |
1348 | bdrv_delete(bs->backing_hd); | |
1349 | bs->backing_hd = NULL; | |
1350 | bs_ro = bdrv_new(""); | |
ee181196 KW |
1351 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1352 | backing_drv); | |
4dca4b63 NS |
1353 | if (ret < 0) { |
1354 | bdrv_delete(bs_ro); | |
1355 | /* drive not functional anymore */ | |
1356 | bs->drv = NULL; | |
1357 | return ret; | |
1358 | } | |
1359 | bs->backing_hd = bs_ro; | |
1360 | bs->backing_hd->keep_read_only = 0; | |
1361 | } | |
1362 | ||
1d44952f | 1363 | return ret; |
33e3963e FB |
1364 | } |
1365 | ||
e8877497 | 1366 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1367 | { |
1368 | BlockDriverState *bs; | |
1369 | ||
1370 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
e8877497 SH |
1371 | int ret = bdrv_commit(bs); |
1372 | if (ret < 0) { | |
1373 | return ret; | |
1374 | } | |
6ab4b5ab | 1375 | } |
e8877497 | 1376 | return 0; |
6ab4b5ab MA |
1377 | } |
1378 | ||
dbffbdcf SH |
1379 | struct BdrvTrackedRequest { |
1380 | BlockDriverState *bs; | |
1381 | int64_t sector_num; | |
1382 | int nb_sectors; | |
1383 | bool is_write; | |
1384 | QLIST_ENTRY(BdrvTrackedRequest) list; | |
5f8b6491 | 1385 | Coroutine *co; /* owner, used for deadlock detection */ |
f4658285 | 1386 | CoQueue wait_queue; /* coroutines blocked on this request */ |
dbffbdcf SH |
1387 | }; |
1388 | ||
1389 | /** | |
1390 | * Remove an active request from the tracked requests list | |
1391 | * | |
1392 | * This function should be called when a tracked request is completing. | |
1393 | */ | |
1394 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1395 | { | |
1396 | QLIST_REMOVE(req, list); | |
f4658285 | 1397 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1398 | } |
1399 | ||
1400 | /** | |
1401 | * Add an active request to the tracked requests list | |
1402 | */ | |
1403 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1404 | BlockDriverState *bs, | |
1405 | int64_t sector_num, | |
1406 | int nb_sectors, bool is_write) | |
1407 | { | |
1408 | *req = (BdrvTrackedRequest){ | |
1409 | .bs = bs, | |
1410 | .sector_num = sector_num, | |
1411 | .nb_sectors = nb_sectors, | |
1412 | .is_write = is_write, | |
5f8b6491 | 1413 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1414 | }; |
1415 | ||
f4658285 SH |
1416 | qemu_co_queue_init(&req->wait_queue); |
1417 | ||
dbffbdcf SH |
1418 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1419 | } | |
1420 | ||
d83947ac SH |
1421 | /** |
1422 | * Round a region to cluster boundaries | |
1423 | */ | |
1424 | static void round_to_clusters(BlockDriverState *bs, | |
1425 | int64_t sector_num, int nb_sectors, | |
1426 | int64_t *cluster_sector_num, | |
1427 | int *cluster_nb_sectors) | |
1428 | { | |
1429 | BlockDriverInfo bdi; | |
1430 | ||
1431 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1432 | *cluster_sector_num = sector_num; | |
1433 | *cluster_nb_sectors = nb_sectors; | |
1434 | } else { | |
1435 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1436 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1437 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1438 | nb_sectors, c); | |
1439 | } | |
1440 | } | |
1441 | ||
f4658285 SH |
1442 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1443 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1444 | /* aaaa bbbb */ |
1445 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1446 | return false; | |
1447 | } | |
1448 | /* bbbb aaaa */ | |
1449 | if (req->sector_num >= sector_num + nb_sectors) { | |
1450 | return false; | |
1451 | } | |
1452 | return true; | |
f4658285 SH |
1453 | } |
1454 | ||
1455 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1456 | int64_t sector_num, int nb_sectors) | |
1457 | { | |
1458 | BdrvTrackedRequest *req; | |
d83947ac SH |
1459 | int64_t cluster_sector_num; |
1460 | int cluster_nb_sectors; | |
f4658285 SH |
1461 | bool retry; |
1462 | ||
d83947ac SH |
1463 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1464 | * that allocating writes will be serialized and not race with each other | |
1465 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1466 | * CoR read and write operations are atomic and guest writes cannot | |
1467 | * interleave between them. | |
1468 | */ | |
1469 | round_to_clusters(bs, sector_num, nb_sectors, | |
1470 | &cluster_sector_num, &cluster_nb_sectors); | |
1471 | ||
f4658285 SH |
1472 | do { |
1473 | retry = false; | |
1474 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1475 | if (tracked_request_overlaps(req, cluster_sector_num, |
1476 | cluster_nb_sectors)) { | |
5f8b6491 SH |
1477 | /* Hitting this means there was a reentrant request, for |
1478 | * example, a block driver issuing nested requests. This must | |
1479 | * never happen since it means deadlock. | |
1480 | */ | |
1481 | assert(qemu_coroutine_self() != req->co); | |
1482 | ||
f4658285 SH |
1483 | qemu_co_queue_wait(&req->wait_queue); |
1484 | retry = true; | |
1485 | break; | |
1486 | } | |
1487 | } | |
1488 | } while (retry); | |
1489 | } | |
1490 | ||
756e6736 KW |
1491 | /* |
1492 | * Return values: | |
1493 | * 0 - success | |
1494 | * -EINVAL - backing format specified, but no file | |
1495 | * -ENOSPC - can't update the backing file because no space is left in the | |
1496 | * image file header | |
1497 | * -ENOTSUP - format driver doesn't support changing the backing file | |
1498 | */ | |
1499 | int bdrv_change_backing_file(BlockDriverState *bs, | |
1500 | const char *backing_file, const char *backing_fmt) | |
1501 | { | |
1502 | BlockDriver *drv = bs->drv; | |
469ef350 | 1503 | int ret; |
756e6736 | 1504 | |
5f377794 PB |
1505 | /* Backing file format doesn't make sense without a backing file */ |
1506 | if (backing_fmt && !backing_file) { | |
1507 | return -EINVAL; | |
1508 | } | |
1509 | ||
756e6736 | 1510 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 1511 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 1512 | } else { |
469ef350 | 1513 | ret = -ENOTSUP; |
756e6736 | 1514 | } |
469ef350 PB |
1515 | |
1516 | if (ret == 0) { | |
1517 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
1518 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1519 | } | |
1520 | return ret; | |
756e6736 KW |
1521 | } |
1522 | ||
71d0770c AL |
1523 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1524 | size_t size) | |
1525 | { | |
1526 | int64_t len; | |
1527 | ||
1528 | if (!bdrv_is_inserted(bs)) | |
1529 | return -ENOMEDIUM; | |
1530 | ||
1531 | if (bs->growable) | |
1532 | return 0; | |
1533 | ||
1534 | len = bdrv_getlength(bs); | |
1535 | ||
fbb7b4e0 KW |
1536 | if (offset < 0) |
1537 | return -EIO; | |
1538 | ||
1539 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
1540 | return -EIO; |
1541 | ||
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
1546 | int nb_sectors) | |
1547 | { | |
eb5a3165 JS |
1548 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
1549 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
1550 | } |
1551 | ||
1c9805a3 SH |
1552 | typedef struct RwCo { |
1553 | BlockDriverState *bs; | |
1554 | int64_t sector_num; | |
1555 | int nb_sectors; | |
1556 | QEMUIOVector *qiov; | |
1557 | bool is_write; | |
1558 | int ret; | |
1559 | } RwCo; | |
1560 | ||
1561 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 1562 | { |
1c9805a3 | 1563 | RwCo *rwco = opaque; |
ea2384d3 | 1564 | |
1c9805a3 SH |
1565 | if (!rwco->is_write) { |
1566 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
470c0504 | 1567 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1568 | } else { |
1569 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
f08f2dda | 1570 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
1571 | } |
1572 | } | |
e7a8a783 | 1573 | |
1c9805a3 SH |
1574 | /* |
1575 | * Process a synchronous request using coroutines | |
1576 | */ | |
1577 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
1578 | int nb_sectors, bool is_write) | |
1579 | { | |
1580 | QEMUIOVector qiov; | |
1581 | struct iovec iov = { | |
1582 | .iov_base = (void *)buf, | |
1583 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1584 | }; | |
1585 | Coroutine *co; | |
1586 | RwCo rwco = { | |
1587 | .bs = bs, | |
1588 | .sector_num = sector_num, | |
1589 | .nb_sectors = nb_sectors, | |
1590 | .qiov = &qiov, | |
1591 | .is_write = is_write, | |
1592 | .ret = NOT_DONE, | |
1593 | }; | |
e7a8a783 | 1594 | |
1c9805a3 | 1595 | qemu_iovec_init_external(&qiov, &iov, 1); |
e7a8a783 | 1596 | |
498e386c ZYW |
1597 | /** |
1598 | * In sync call context, when the vcpu is blocked, this throttling timer | |
1599 | * will not fire; so the I/O throttling function has to be disabled here | |
1600 | * if it has been enabled. | |
1601 | */ | |
1602 | if (bs->io_limits_enabled) { | |
1603 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
1604 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
1605 | bdrv_io_limits_disable(bs); | |
1606 | } | |
1607 | ||
1c9805a3 SH |
1608 | if (qemu_in_coroutine()) { |
1609 | /* Fast-path if already in coroutine context */ | |
1610 | bdrv_rw_co_entry(&rwco); | |
1611 | } else { | |
1612 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
1613 | qemu_coroutine_enter(co, &rwco); | |
1614 | while (rwco.ret == NOT_DONE) { | |
1615 | qemu_aio_wait(); | |
1616 | } | |
1617 | } | |
1618 | return rwco.ret; | |
1619 | } | |
b338082b | 1620 | |
1c9805a3 SH |
1621 | /* return < 0 if error. See bdrv_write() for the return codes */ |
1622 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
1623 | uint8_t *buf, int nb_sectors) | |
1624 | { | |
1625 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
fc01f7e7 FB |
1626 | } |
1627 | ||
71df14fc PB |
1628 | #define BITS_PER_LONG (sizeof(unsigned long) * 8) |
1629 | ||
7cd1e32a | 1630 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 1631 | int nb_sectors, int dirty) |
7cd1e32a | 1632 | { |
1633 | int64_t start, end; | |
c6d22830 | 1634 | unsigned long val, idx, bit; |
a55eb92c | 1635 | |
6ea44308 | 1636 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 1637 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
1638 | |
1639 | for (; start <= end; start++) { | |
71df14fc PB |
1640 | idx = start / BITS_PER_LONG; |
1641 | bit = start % BITS_PER_LONG; | |
c6d22830 JK |
1642 | val = bs->dirty_bitmap[idx]; |
1643 | if (dirty) { | |
6d59fec1 | 1644 | if (!(val & (1UL << bit))) { |
aaa0eb75 | 1645 | bs->dirty_count++; |
6d59fec1 | 1646 | val |= 1UL << bit; |
aaa0eb75 | 1647 | } |
c6d22830 | 1648 | } else { |
6d59fec1 | 1649 | if (val & (1UL << bit)) { |
aaa0eb75 | 1650 | bs->dirty_count--; |
6d59fec1 | 1651 | val &= ~(1UL << bit); |
aaa0eb75 | 1652 | } |
c6d22830 JK |
1653 | } |
1654 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 1655 | } |
1656 | } | |
1657 | ||
5fafdf24 | 1658 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
1659 | -EIO generic I/O error (may happen for all errors) |
1660 | -ENOMEDIUM No media inserted. | |
1661 | -EINVAL Invalid sector number or nb_sectors | |
1662 | -EACCES Trying to write a read-only device | |
1663 | */ | |
5fafdf24 | 1664 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
1665 | const uint8_t *buf, int nb_sectors) |
1666 | { | |
1c9805a3 | 1667 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
83f64091 FB |
1668 | } |
1669 | ||
eda578e5 AL |
1670 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
1671 | void *buf, int count1) | |
83f64091 | 1672 | { |
6ea44308 | 1673 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1674 | int len, nb_sectors, count; |
1675 | int64_t sector_num; | |
9a8c4cce | 1676 | int ret; |
83f64091 FB |
1677 | |
1678 | count = count1; | |
1679 | /* first read to align to sector start */ | |
6ea44308 | 1680 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1681 | if (len > count) |
1682 | len = count; | |
6ea44308 | 1683 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1684 | if (len > 0) { |
9a8c4cce KW |
1685 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1686 | return ret; | |
6ea44308 | 1687 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
1688 | count -= len; |
1689 | if (count == 0) | |
1690 | return count1; | |
1691 | sector_num++; | |
1692 | buf += len; | |
1693 | } | |
1694 | ||
1695 | /* read the sectors "in place" */ | |
6ea44308 | 1696 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1697 | if (nb_sectors > 0) { |
9a8c4cce KW |
1698 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1699 | return ret; | |
83f64091 | 1700 | sector_num += nb_sectors; |
6ea44308 | 1701 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1702 | buf += len; |
1703 | count -= len; | |
1704 | } | |
1705 | ||
1706 | /* add data from the last sector */ | |
1707 | if (count > 0) { | |
9a8c4cce KW |
1708 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1709 | return ret; | |
83f64091 FB |
1710 | memcpy(buf, tmp_buf, count); |
1711 | } | |
1712 | return count1; | |
1713 | } | |
1714 | ||
eda578e5 AL |
1715 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
1716 | const void *buf, int count1) | |
83f64091 | 1717 | { |
6ea44308 | 1718 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1719 | int len, nb_sectors, count; |
1720 | int64_t sector_num; | |
9a8c4cce | 1721 | int ret; |
83f64091 FB |
1722 | |
1723 | count = count1; | |
1724 | /* first write to align to sector start */ | |
6ea44308 | 1725 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1726 | if (len > count) |
1727 | len = count; | |
6ea44308 | 1728 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1729 | if (len > 0) { |
9a8c4cce KW |
1730 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1731 | return ret; | |
6ea44308 | 1732 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1733 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1734 | return ret; | |
83f64091 FB |
1735 | count -= len; |
1736 | if (count == 0) | |
1737 | return count1; | |
1738 | sector_num++; | |
1739 | buf += len; | |
1740 | } | |
1741 | ||
1742 | /* write the sectors "in place" */ | |
6ea44308 | 1743 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1744 | if (nb_sectors > 0) { |
9a8c4cce KW |
1745 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1746 | return ret; | |
83f64091 | 1747 | sector_num += nb_sectors; |
6ea44308 | 1748 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1749 | buf += len; |
1750 | count -= len; | |
1751 | } | |
1752 | ||
1753 | /* add data from the last sector */ | |
1754 | if (count > 0) { | |
9a8c4cce KW |
1755 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1756 | return ret; | |
83f64091 | 1757 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1758 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1759 | return ret; | |
83f64091 FB |
1760 | } |
1761 | return count1; | |
1762 | } | |
83f64091 | 1763 | |
f08145fe KW |
1764 | /* |
1765 | * Writes to the file and ensures that no writes are reordered across this | |
1766 | * request (acts as a barrier) | |
1767 | * | |
1768 | * Returns 0 on success, -errno in error cases. | |
1769 | */ | |
1770 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1771 | const void *buf, int count) | |
1772 | { | |
1773 | int ret; | |
1774 | ||
1775 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1776 | if (ret < 0) { | |
1777 | return ret; | |
1778 | } | |
1779 | ||
f05fa4ad PB |
1780 | /* No flush needed for cache modes that already do it */ |
1781 | if (bs->enable_write_cache) { | |
f08145fe KW |
1782 | bdrv_flush(bs); |
1783 | } | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | ||
470c0504 | 1788 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
1789 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
1790 | { | |
1791 | /* Perform I/O through a temporary buffer so that users who scribble over | |
1792 | * their read buffer while the operation is in progress do not end up | |
1793 | * modifying the image file. This is critical for zero-copy guest I/O | |
1794 | * where anything might happen inside guest memory. | |
1795 | */ | |
1796 | void *bounce_buffer; | |
1797 | ||
79c053bd | 1798 | BlockDriver *drv = bs->drv; |
ab185921 SH |
1799 | struct iovec iov; |
1800 | QEMUIOVector bounce_qiov; | |
1801 | int64_t cluster_sector_num; | |
1802 | int cluster_nb_sectors; | |
1803 | size_t skip_bytes; | |
1804 | int ret; | |
1805 | ||
1806 | /* Cover entire cluster so no additional backing file I/O is required when | |
1807 | * allocating cluster in the image file. | |
1808 | */ | |
1809 | round_to_clusters(bs, sector_num, nb_sectors, | |
1810 | &cluster_sector_num, &cluster_nb_sectors); | |
1811 | ||
470c0504 SH |
1812 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
1813 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
1814 | |
1815 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
1816 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
1817 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
1818 | ||
79c053bd SH |
1819 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
1820 | &bounce_qiov); | |
ab185921 SH |
1821 | if (ret < 0) { |
1822 | goto err; | |
1823 | } | |
1824 | ||
79c053bd SH |
1825 | if (drv->bdrv_co_write_zeroes && |
1826 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
1827 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
1828 | cluster_nb_sectors); | |
79c053bd | 1829 | } else { |
f05fa4ad PB |
1830 | /* This does not change the data on the disk, it is not necessary |
1831 | * to flush even in cache=writethrough mode. | |
1832 | */ | |
79c053bd | 1833 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 1834 | &bounce_qiov); |
79c053bd SH |
1835 | } |
1836 | ||
ab185921 SH |
1837 | if (ret < 0) { |
1838 | /* It might be okay to ignore write errors for guest requests. If this | |
1839 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
1840 | * Simply report it in all cases. | |
1841 | */ | |
1842 | goto err; | |
1843 | } | |
1844 | ||
1845 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
1846 | qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, | |
1847 | nb_sectors * BDRV_SECTOR_SIZE); | |
1848 | ||
1849 | err: | |
1850 | qemu_vfree(bounce_buffer); | |
1851 | return ret; | |
1852 | } | |
1853 | ||
c5fbe571 SH |
1854 | /* |
1855 | * Handle a read request in coroutine context | |
1856 | */ | |
1857 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
1858 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
1859 | BdrvRequestFlags flags) | |
da1fa91d KW |
1860 | { |
1861 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
1862 | BdrvTrackedRequest req; |
1863 | int ret; | |
da1fa91d | 1864 | |
da1fa91d KW |
1865 | if (!drv) { |
1866 | return -ENOMEDIUM; | |
1867 | } | |
1868 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1869 | return -EIO; | |
1870 | } | |
1871 | ||
98f90dba ZYW |
1872 | /* throttling disk read I/O */ |
1873 | if (bs->io_limits_enabled) { | |
1874 | bdrv_io_limits_intercept(bs, false, nb_sectors); | |
1875 | } | |
1876 | ||
f4658285 | 1877 | if (bs->copy_on_read) { |
470c0504 SH |
1878 | flags |= BDRV_REQ_COPY_ON_READ; |
1879 | } | |
1880 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1881 | bs->copy_on_read_in_flight++; | |
1882 | } | |
1883 | ||
1884 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
1885 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1886 | } | |
1887 | ||
dbffbdcf | 1888 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 1889 | |
470c0504 | 1890 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
1891 | int pnum; |
1892 | ||
1893 | ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); | |
1894 | if (ret < 0) { | |
1895 | goto out; | |
1896 | } | |
1897 | ||
1898 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 1899 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1900 | goto out; |
1901 | } | |
1902 | } | |
1903 | ||
dbffbdcf | 1904 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
1905 | |
1906 | out: | |
dbffbdcf | 1907 | tracked_request_end(&req); |
470c0504 SH |
1908 | |
1909 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
1910 | bs->copy_on_read_in_flight--; | |
1911 | } | |
1912 | ||
dbffbdcf | 1913 | return ret; |
da1fa91d KW |
1914 | } |
1915 | ||
c5fbe571 | 1916 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
1917 | int nb_sectors, QEMUIOVector *qiov) |
1918 | { | |
c5fbe571 | 1919 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 1920 | |
470c0504 SH |
1921 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
1922 | } | |
1923 | ||
1924 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
1925 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
1926 | { | |
1927 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
1928 | ||
1929 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
1930 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
1931 | } |
1932 | ||
f08f2dda SH |
1933 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
1934 | int64_t sector_num, int nb_sectors) | |
1935 | { | |
1936 | BlockDriver *drv = bs->drv; | |
1937 | QEMUIOVector qiov; | |
1938 | struct iovec iov; | |
1939 | int ret; | |
1940 | ||
621f0589 KW |
1941 | /* TODO Emulate only part of misaligned requests instead of letting block |
1942 | * drivers return -ENOTSUP and emulate everything */ | |
1943 | ||
f08f2dda SH |
1944 | /* First try the efficient write zeroes operation */ |
1945 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
1946 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
1947 | if (ret != -ENOTSUP) { | |
1948 | return ret; | |
1949 | } | |
f08f2dda SH |
1950 | } |
1951 | ||
1952 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
1953 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
1954 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
1955 | memset(iov.iov_base, 0, iov.iov_len); | |
1956 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1957 | ||
1958 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
1959 | ||
1960 | qemu_vfree(iov.iov_base); | |
1961 | return ret; | |
1962 | } | |
1963 | ||
c5fbe571 SH |
1964 | /* |
1965 | * Handle a write request in coroutine context | |
1966 | */ | |
1967 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
1968 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
1969 | BdrvRequestFlags flags) | |
c5fbe571 SH |
1970 | { |
1971 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 1972 | BdrvTrackedRequest req; |
6b7cb247 | 1973 | int ret; |
da1fa91d KW |
1974 | |
1975 | if (!bs->drv) { | |
1976 | return -ENOMEDIUM; | |
1977 | } | |
1978 | if (bs->read_only) { | |
1979 | return -EACCES; | |
1980 | } | |
1981 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1982 | return -EIO; | |
1983 | } | |
1984 | ||
98f90dba ZYW |
1985 | /* throttling disk write I/O */ |
1986 | if (bs->io_limits_enabled) { | |
1987 | bdrv_io_limits_intercept(bs, true, nb_sectors); | |
1988 | } | |
1989 | ||
470c0504 | 1990 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
1991 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1992 | } | |
1993 | ||
dbffbdcf SH |
1994 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
1995 | ||
f08f2dda SH |
1996 | if (flags & BDRV_REQ_ZERO_WRITE) { |
1997 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); | |
1998 | } else { | |
1999 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
2000 | } | |
6b7cb247 | 2001 | |
f05fa4ad PB |
2002 | if (ret == 0 && !bs->enable_write_cache) { |
2003 | ret = bdrv_co_flush(bs); | |
2004 | } | |
2005 | ||
da1fa91d KW |
2006 | if (bs->dirty_bitmap) { |
2007 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
2008 | } | |
2009 | ||
2010 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2011 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2012 | } | |
2013 | ||
dbffbdcf SH |
2014 | tracked_request_end(&req); |
2015 | ||
6b7cb247 | 2016 | return ret; |
da1fa91d KW |
2017 | } |
2018 | ||
c5fbe571 SH |
2019 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2020 | int nb_sectors, QEMUIOVector *qiov) | |
2021 | { | |
2022 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2023 | ||
f08f2dda SH |
2024 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
2025 | } | |
2026 | ||
2027 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
2028 | int64_t sector_num, int nb_sectors) | |
2029 | { | |
2030 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
2031 | ||
2032 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
2033 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
2034 | } |
2035 | ||
83f64091 FB |
2036 | /** |
2037 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2038 | */ | |
2039 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2040 | { | |
2041 | BlockDriver *drv = bs->drv; | |
51762288 | 2042 | int ret; |
83f64091 | 2043 | if (!drv) |
19cb3738 | 2044 | return -ENOMEDIUM; |
83f64091 FB |
2045 | if (!drv->bdrv_truncate) |
2046 | return -ENOTSUP; | |
59f2689d NS |
2047 | if (bs->read_only) |
2048 | return -EACCES; | |
8591675f MT |
2049 | if (bdrv_in_use(bs)) |
2050 | return -EBUSY; | |
51762288 SH |
2051 | ret = drv->bdrv_truncate(bs, offset); |
2052 | if (ret == 0) { | |
2053 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2054 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2055 | } |
2056 | return ret; | |
83f64091 FB |
2057 | } |
2058 | ||
4a1d5e1f FZ |
2059 | /** |
2060 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2061 | * allocated space. Return < 0 if error or unknown. | |
2062 | */ | |
2063 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2064 | { | |
2065 | BlockDriver *drv = bs->drv; | |
2066 | if (!drv) { | |
2067 | return -ENOMEDIUM; | |
2068 | } | |
2069 | if (drv->bdrv_get_allocated_file_size) { | |
2070 | return drv->bdrv_get_allocated_file_size(bs); | |
2071 | } | |
2072 | if (bs->file) { | |
2073 | return bdrv_get_allocated_file_size(bs->file); | |
2074 | } | |
2075 | return -ENOTSUP; | |
2076 | } | |
2077 | ||
83f64091 FB |
2078 | /** |
2079 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2080 | */ | |
2081 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2082 | { | |
2083 | BlockDriver *drv = bs->drv; | |
2084 | if (!drv) | |
19cb3738 | 2085 | return -ENOMEDIUM; |
51762288 | 2086 | |
2c6942fa | 2087 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2088 | if (drv->bdrv_getlength) { |
2089 | return drv->bdrv_getlength(bs); | |
2090 | } | |
83f64091 | 2091 | } |
46a4e4e6 | 2092 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2093 | } |
2094 | ||
19cb3738 | 2095 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2096 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2097 | { |
19cb3738 FB |
2098 | int64_t length; |
2099 | length = bdrv_getlength(bs); | |
2100 | if (length < 0) | |
2101 | length = 0; | |
2102 | else | |
6ea44308 | 2103 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2104 | *nb_sectors_ptr = length; |
fc01f7e7 | 2105 | } |
cf98951b | 2106 | |
f3d54fc4 AL |
2107 | struct partition { |
2108 | uint8_t boot_ind; /* 0x80 - active */ | |
2109 | uint8_t head; /* starting head */ | |
2110 | uint8_t sector; /* starting sector */ | |
2111 | uint8_t cyl; /* starting cylinder */ | |
2112 | uint8_t sys_ind; /* What partition type */ | |
2113 | uint8_t end_head; /* end head */ | |
2114 | uint8_t end_sector; /* end sector */ | |
2115 | uint8_t end_cyl; /* end cylinder */ | |
2116 | uint32_t start_sect; /* starting sector counting from 0 */ | |
2117 | uint32_t nr_sects; /* nr of sectors in partition */ | |
541dc0d4 | 2118 | } QEMU_PACKED; |
f3d54fc4 AL |
2119 | |
2120 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
2121 | static int guess_disk_lchs(BlockDriverState *bs, | |
2122 | int *pcylinders, int *pheads, int *psectors) | |
2123 | { | |
eb5a3165 | 2124 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
2125 | int ret, i, heads, sectors, cylinders; |
2126 | struct partition *p; | |
2127 | uint32_t nr_sects; | |
a38131b6 | 2128 | uint64_t nb_sectors; |
498e386c | 2129 | bool enabled; |
f3d54fc4 AL |
2130 | |
2131 | bdrv_get_geometry(bs, &nb_sectors); | |
2132 | ||
498e386c ZYW |
2133 | /** |
2134 | * The function will be invoked during startup not only in sync I/O mode, | |
2135 | * but also in async I/O mode. So the I/O throttling function has to | |
2136 | * be disabled temporarily here, not permanently. | |
2137 | */ | |
2138 | enabled = bs->io_limits_enabled; | |
2139 | bs->io_limits_enabled = false; | |
f3d54fc4 | 2140 | ret = bdrv_read(bs, 0, buf, 1); |
498e386c | 2141 | bs->io_limits_enabled = enabled; |
f3d54fc4 AL |
2142 | if (ret < 0) |
2143 | return -1; | |
2144 | /* test msdos magic */ | |
2145 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
2146 | return -1; | |
2147 | for(i = 0; i < 4; i++) { | |
2148 | p = ((struct partition *)(buf + 0x1be)) + i; | |
2149 | nr_sects = le32_to_cpu(p->nr_sects); | |
2150 | if (nr_sects && p->end_head) { | |
2151 | /* We make the assumption that the partition terminates on | |
2152 | a cylinder boundary */ | |
2153 | heads = p->end_head + 1; | |
2154 | sectors = p->end_sector & 63; | |
2155 | if (sectors == 0) | |
2156 | continue; | |
2157 | cylinders = nb_sectors / (heads * sectors); | |
2158 | if (cylinders < 1 || cylinders > 16383) | |
2159 | continue; | |
2160 | *pheads = heads; | |
2161 | *psectors = sectors; | |
2162 | *pcylinders = cylinders; | |
2163 | #if 0 | |
2164 | printf("guessed geometry: LCHS=%d %d %d\n", | |
2165 | cylinders, heads, sectors); | |
2166 | #endif | |
2167 | return 0; | |
2168 | } | |
2169 | } | |
2170 | return -1; | |
2171 | } | |
2172 | ||
2173 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
2174 | { | |
2175 | int translation, lba_detected = 0; | |
2176 | int cylinders, heads, secs; | |
a38131b6 | 2177 | uint64_t nb_sectors; |
f3d54fc4 AL |
2178 | |
2179 | /* if a geometry hint is available, use it */ | |
2180 | bdrv_get_geometry(bs, &nb_sectors); | |
2181 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
2182 | translation = bdrv_get_translation_hint(bs); | |
2183 | if (cylinders != 0) { | |
2184 | *pcyls = cylinders; | |
2185 | *pheads = heads; | |
2186 | *psecs = secs; | |
2187 | } else { | |
2188 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
2189 | if (heads > 16) { | |
2190 | /* if heads > 16, it means that a BIOS LBA | |
2191 | translation was active, so the default | |
2192 | hardware geometry is OK */ | |
2193 | lba_detected = 1; | |
2194 | goto default_geometry; | |
2195 | } else { | |
2196 | *pcyls = cylinders; | |
2197 | *pheads = heads; | |
2198 | *psecs = secs; | |
2199 | /* disable any translation to be in sync with | |
2200 | the logical geometry */ | |
2201 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
2202 | bdrv_set_translation_hint(bs, | |
2203 | BIOS_ATA_TRANSLATION_NONE); | |
2204 | } | |
2205 | } | |
2206 | } else { | |
2207 | default_geometry: | |
2208 | /* if no geometry, use a standard physical disk geometry */ | |
2209 | cylinders = nb_sectors / (16 * 63); | |
2210 | ||
2211 | if (cylinders > 16383) | |
2212 | cylinders = 16383; | |
2213 | else if (cylinders < 2) | |
2214 | cylinders = 2; | |
2215 | *pcyls = cylinders; | |
2216 | *pheads = 16; | |
2217 | *psecs = 63; | |
2218 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
2219 | if ((*pcyls * *pheads) <= 131072) { | |
2220 | bdrv_set_translation_hint(bs, | |
2221 | BIOS_ATA_TRANSLATION_LARGE); | |
2222 | } else { | |
2223 | bdrv_set_translation_hint(bs, | |
2224 | BIOS_ATA_TRANSLATION_LBA); | |
2225 | } | |
2226 | } | |
2227 | } | |
2228 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
2229 | } | |
2230 | } | |
2231 | ||
5fafdf24 | 2232 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
2233 | int cyls, int heads, int secs) |
2234 | { | |
2235 | bs->cyls = cyls; | |
2236 | bs->heads = heads; | |
2237 | bs->secs = secs; | |
2238 | } | |
2239 | ||
46d4767d FB |
2240 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
2241 | { | |
2242 | bs->translation = translation; | |
2243 | } | |
2244 | ||
5fafdf24 | 2245 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
2246 | int *pcyls, int *pheads, int *psecs) |
2247 | { | |
2248 | *pcyls = bs->cyls; | |
2249 | *pheads = bs->heads; | |
2250 | *psecs = bs->secs; | |
2251 | } | |
2252 | ||
0563e191 ZYW |
2253 | /* throttling disk io limits */ |
2254 | void bdrv_set_io_limits(BlockDriverState *bs, | |
2255 | BlockIOLimit *io_limits) | |
2256 | { | |
2257 | bs->io_limits = *io_limits; | |
2258 | bs->io_limits_enabled = bdrv_io_limits_enabled(bs); | |
2259 | } | |
2260 | ||
5bbdbb46 BS |
2261 | /* Recognize floppy formats */ |
2262 | typedef struct FDFormat { | |
2263 | FDriveType drive; | |
2264 | uint8_t last_sect; | |
2265 | uint8_t max_track; | |
2266 | uint8_t max_head; | |
f8d3d128 | 2267 | FDriveRate rate; |
5bbdbb46 BS |
2268 | } FDFormat; |
2269 | ||
2270 | static const FDFormat fd_formats[] = { | |
2271 | /* First entry is default format */ | |
2272 | /* 1.44 MB 3"1/2 floppy disks */ | |
f8d3d128 HP |
2273 | { FDRIVE_DRV_144, 18, 80, 1, FDRIVE_RATE_500K, }, |
2274 | { FDRIVE_DRV_144, 20, 80, 1, FDRIVE_RATE_500K, }, | |
2275 | { FDRIVE_DRV_144, 21, 80, 1, FDRIVE_RATE_500K, }, | |
2276 | { FDRIVE_DRV_144, 21, 82, 1, FDRIVE_RATE_500K, }, | |
2277 | { FDRIVE_DRV_144, 21, 83, 1, FDRIVE_RATE_500K, }, | |
2278 | { FDRIVE_DRV_144, 22, 80, 1, FDRIVE_RATE_500K, }, | |
2279 | { FDRIVE_DRV_144, 23, 80, 1, FDRIVE_RATE_500K, }, | |
2280 | { FDRIVE_DRV_144, 24, 80, 1, FDRIVE_RATE_500K, }, | |
5bbdbb46 | 2281 | /* 2.88 MB 3"1/2 floppy disks */ |
f8d3d128 HP |
2282 | { FDRIVE_DRV_288, 36, 80, 1, FDRIVE_RATE_1M, }, |
2283 | { FDRIVE_DRV_288, 39, 80, 1, FDRIVE_RATE_1M, }, | |
2284 | { FDRIVE_DRV_288, 40, 80, 1, FDRIVE_RATE_1M, }, | |
2285 | { FDRIVE_DRV_288, 44, 80, 1, FDRIVE_RATE_1M, }, | |
2286 | { FDRIVE_DRV_288, 48, 80, 1, FDRIVE_RATE_1M, }, | |
5bbdbb46 | 2287 | /* 720 kB 3"1/2 floppy disks */ |
f8d3d128 HP |
2288 | { FDRIVE_DRV_144, 9, 80, 1, FDRIVE_RATE_250K, }, |
2289 | { FDRIVE_DRV_144, 10, 80, 1, FDRIVE_RATE_250K, }, | |
2290 | { FDRIVE_DRV_144, 10, 82, 1, FDRIVE_RATE_250K, }, | |
2291 | { FDRIVE_DRV_144, 10, 83, 1, FDRIVE_RATE_250K, }, | |
2292 | { FDRIVE_DRV_144, 13, 80, 1, FDRIVE_RATE_250K, }, | |
2293 | { FDRIVE_DRV_144, 14, 80, 1, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2294 | /* 1.2 MB 5"1/4 floppy disks */ |
f8d3d128 HP |
2295 | { FDRIVE_DRV_120, 15, 80, 1, FDRIVE_RATE_500K, }, |
2296 | { FDRIVE_DRV_120, 18, 80, 1, FDRIVE_RATE_500K, }, | |
2297 | { FDRIVE_DRV_120, 18, 82, 1, FDRIVE_RATE_500K, }, | |
2298 | { FDRIVE_DRV_120, 18, 83, 1, FDRIVE_RATE_500K, }, | |
2299 | { FDRIVE_DRV_120, 20, 80, 1, FDRIVE_RATE_500K, }, | |
5bbdbb46 | 2300 | /* 720 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2301 | { FDRIVE_DRV_120, 9, 80, 1, FDRIVE_RATE_250K, }, |
2302 | { FDRIVE_DRV_120, 11, 80, 1, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2303 | /* 360 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2304 | { FDRIVE_DRV_120, 9, 40, 1, FDRIVE_RATE_300K, }, |
2305 | { FDRIVE_DRV_120, 9, 40, 0, FDRIVE_RATE_300K, }, | |
2306 | { FDRIVE_DRV_120, 10, 41, 1, FDRIVE_RATE_300K, }, | |
2307 | { FDRIVE_DRV_120, 10, 42, 1, FDRIVE_RATE_300K, }, | |
5bbdbb46 | 2308 | /* 320 kB 5"1/4 floppy disks */ |
f8d3d128 HP |
2309 | { FDRIVE_DRV_120, 8, 40, 1, FDRIVE_RATE_250K, }, |
2310 | { FDRIVE_DRV_120, 8, 40, 0, FDRIVE_RATE_250K, }, | |
5bbdbb46 | 2311 | /* 360 kB must match 5"1/4 better than 3"1/2... */ |
f8d3d128 | 2312 | { FDRIVE_DRV_144, 9, 80, 0, FDRIVE_RATE_250K, }, |
5bbdbb46 | 2313 | /* end */ |
f8d3d128 | 2314 | { FDRIVE_DRV_NONE, -1, -1, 0, 0, }, |
5bbdbb46 BS |
2315 | }; |
2316 | ||
2317 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
2318 | int *max_track, int *last_sect, | |
f8d3d128 HP |
2319 | FDriveType drive_in, FDriveType *drive, |
2320 | FDriveRate *rate) | |
5bbdbb46 BS |
2321 | { |
2322 | const FDFormat *parse; | |
2323 | uint64_t nb_sectors, size; | |
2324 | int i, first_match, match; | |
2325 | ||
2326 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
2327 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
2328 | /* User defined disk */ | |
f8d3d128 | 2329 | *rate = FDRIVE_RATE_500K; |
5bbdbb46 BS |
2330 | } else { |
2331 | bdrv_get_geometry(bs, &nb_sectors); | |
2332 | match = -1; | |
2333 | first_match = -1; | |
2334 | for (i = 0; ; i++) { | |
2335 | parse = &fd_formats[i]; | |
2336 | if (parse->drive == FDRIVE_DRV_NONE) { | |
2337 | break; | |
2338 | } | |
2339 | if (drive_in == parse->drive || | |
2340 | drive_in == FDRIVE_DRV_NONE) { | |
2341 | size = (parse->max_head + 1) * parse->max_track * | |
2342 | parse->last_sect; | |
2343 | if (nb_sectors == size) { | |
2344 | match = i; | |
2345 | break; | |
2346 | } | |
2347 | if (first_match == -1) { | |
2348 | first_match = i; | |
2349 | } | |
2350 | } | |
2351 | } | |
2352 | if (match == -1) { | |
2353 | if (first_match == -1) { | |
2354 | match = 1; | |
2355 | } else { | |
2356 | match = first_match; | |
2357 | } | |
2358 | parse = &fd_formats[match]; | |
2359 | } | |
2360 | *nb_heads = parse->max_head + 1; | |
2361 | *max_track = parse->max_track; | |
2362 | *last_sect = parse->last_sect; | |
2363 | *drive = parse->drive; | |
f8d3d128 | 2364 | *rate = parse->rate; |
5bbdbb46 BS |
2365 | } |
2366 | } | |
2367 | ||
46d4767d FB |
2368 | int bdrv_get_translation_hint(BlockDriverState *bs) |
2369 | { | |
2370 | return bs->translation; | |
2371 | } | |
2372 | ||
abd7f68d MA |
2373 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
2374 | BlockErrorAction on_write_error) | |
2375 | { | |
2376 | bs->on_read_error = on_read_error; | |
2377 | bs->on_write_error = on_write_error; | |
2378 | } | |
2379 | ||
2380 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
2381 | { | |
2382 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2383 | } | |
2384 | ||
b338082b FB |
2385 | int bdrv_is_read_only(BlockDriverState *bs) |
2386 | { | |
2387 | return bs->read_only; | |
2388 | } | |
2389 | ||
985a03b0 TS |
2390 | int bdrv_is_sg(BlockDriverState *bs) |
2391 | { | |
2392 | return bs->sg; | |
2393 | } | |
2394 | ||
e900a7b7 CH |
2395 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2396 | { | |
2397 | return bs->enable_write_cache; | |
2398 | } | |
2399 | ||
425b0148 PB |
2400 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
2401 | { | |
2402 | bs->enable_write_cache = wce; | |
2403 | } | |
2404 | ||
ea2384d3 FB |
2405 | int bdrv_is_encrypted(BlockDriverState *bs) |
2406 | { | |
2407 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2408 | return 1; | |
2409 | return bs->encrypted; | |
2410 | } | |
2411 | ||
c0f4ce77 AL |
2412 | int bdrv_key_required(BlockDriverState *bs) |
2413 | { | |
2414 | BlockDriverState *backing_hd = bs->backing_hd; | |
2415 | ||
2416 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2417 | return 1; | |
2418 | return (bs->encrypted && !bs->valid_key); | |
2419 | } | |
2420 | ||
ea2384d3 FB |
2421 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2422 | { | |
2423 | int ret; | |
2424 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2425 | ret = bdrv_set_key(bs->backing_hd, key); | |
2426 | if (ret < 0) | |
2427 | return ret; | |
2428 | if (!bs->encrypted) | |
2429 | return 0; | |
2430 | } | |
fd04a2ae SH |
2431 | if (!bs->encrypted) { |
2432 | return -EINVAL; | |
2433 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2434 | return -ENOMEDIUM; | |
2435 | } | |
c0f4ce77 | 2436 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2437 | if (ret < 0) { |
2438 | bs->valid_key = 0; | |
2439 | } else if (!bs->valid_key) { | |
2440 | bs->valid_key = 1; | |
2441 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2442 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2443 | } |
c0f4ce77 | 2444 | return ret; |
ea2384d3 FB |
2445 | } |
2446 | ||
f8d6bba1 | 2447 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 2448 | { |
f8d6bba1 | 2449 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
2450 | } |
2451 | ||
5fafdf24 | 2452 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2453 | void *opaque) |
2454 | { | |
2455 | BlockDriver *drv; | |
2456 | ||
8a22f02a | 2457 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2458 | it(opaque, drv->format_name); |
2459 | } | |
2460 | } | |
2461 | ||
b338082b FB |
2462 | BlockDriverState *bdrv_find(const char *name) |
2463 | { | |
2464 | BlockDriverState *bs; | |
2465 | ||
1b7bdbc1 SH |
2466 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2467 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2468 | return bs; |
1b7bdbc1 | 2469 | } |
b338082b FB |
2470 | } |
2471 | return NULL; | |
2472 | } | |
2473 | ||
2f399b0a MA |
2474 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2475 | { | |
2476 | if (!bs) { | |
2477 | return QTAILQ_FIRST(&bdrv_states); | |
2478 | } | |
2479 | return QTAILQ_NEXT(bs, list); | |
2480 | } | |
2481 | ||
51de9760 | 2482 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2483 | { |
2484 | BlockDriverState *bs; | |
2485 | ||
1b7bdbc1 | 2486 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2487 | it(opaque, bs); |
81d0912d FB |
2488 | } |
2489 | } | |
2490 | ||
ea2384d3 FB |
2491 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2492 | { | |
2493 | return bs->device_name; | |
2494 | } | |
2495 | ||
c8433287 MA |
2496 | int bdrv_get_flags(BlockDriverState *bs) |
2497 | { | |
2498 | return bs->open_flags; | |
2499 | } | |
2500 | ||
c6ca28d6 AL |
2501 | void bdrv_flush_all(void) |
2502 | { | |
2503 | BlockDriverState *bs; | |
2504 | ||
1b7bdbc1 | 2505 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
29cdb251 | 2506 | bdrv_flush(bs); |
1b7bdbc1 | 2507 | } |
c6ca28d6 AL |
2508 | } |
2509 | ||
f2feebbd KW |
2510 | int bdrv_has_zero_init(BlockDriverState *bs) |
2511 | { | |
2512 | assert(bs->drv); | |
2513 | ||
336c1c12 KW |
2514 | if (bs->drv->bdrv_has_zero_init) { |
2515 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
2516 | } |
2517 | ||
2518 | return 1; | |
2519 | } | |
2520 | ||
376ae3f1 SH |
2521 | typedef struct BdrvCoIsAllocatedData { |
2522 | BlockDriverState *bs; | |
2523 | int64_t sector_num; | |
2524 | int nb_sectors; | |
2525 | int *pnum; | |
2526 | int ret; | |
2527 | bool done; | |
2528 | } BdrvCoIsAllocatedData; | |
2529 | ||
f58c7b35 TS |
2530 | /* |
2531 | * Returns true iff the specified sector is present in the disk image. Drivers | |
2532 | * not implementing the functionality are assumed to not support backing files, | |
2533 | * hence all their sectors are reported as allocated. | |
2534 | * | |
bd9533e3 SH |
2535 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
2536 | * and 'pnum' is set to 0. | |
2537 | * | |
f58c7b35 TS |
2538 | * 'pnum' is set to the number of sectors (including and immediately following |
2539 | * the specified sector) that are known to be in the same | |
2540 | * allocated/unallocated state. | |
2541 | * | |
bd9533e3 SH |
2542 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
2543 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 2544 | */ |
060f51c9 SH |
2545 | int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
2546 | int nb_sectors, int *pnum) | |
f58c7b35 | 2547 | { |
bd9533e3 SH |
2548 | int64_t n; |
2549 | ||
2550 | if (sector_num >= bs->total_sectors) { | |
2551 | *pnum = 0; | |
2552 | return 0; | |
2553 | } | |
2554 | ||
2555 | n = bs->total_sectors - sector_num; | |
2556 | if (n < nb_sectors) { | |
2557 | nb_sectors = n; | |
2558 | } | |
2559 | ||
6aebab14 | 2560 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 2561 | *pnum = nb_sectors; |
f58c7b35 TS |
2562 | return 1; |
2563 | } | |
6aebab14 | 2564 | |
060f51c9 SH |
2565 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
2566 | } | |
2567 | ||
2568 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
2569 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
2570 | { | |
2571 | BdrvCoIsAllocatedData *data = opaque; | |
2572 | BlockDriverState *bs = data->bs; | |
2573 | ||
2574 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
2575 | data->pnum); | |
2576 | data->done = true; | |
2577 | } | |
2578 | ||
2579 | /* | |
2580 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
2581 | * | |
2582 | * See bdrv_co_is_allocated() for details. | |
2583 | */ | |
2584 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
2585 | int *pnum) | |
2586 | { | |
6aebab14 SH |
2587 | Coroutine *co; |
2588 | BdrvCoIsAllocatedData data = { | |
2589 | .bs = bs, | |
2590 | .sector_num = sector_num, | |
2591 | .nb_sectors = nb_sectors, | |
2592 | .pnum = pnum, | |
2593 | .done = false, | |
2594 | }; | |
2595 | ||
2596 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
2597 | qemu_coroutine_enter(co, &data); | |
2598 | while (!data.done) { | |
2599 | qemu_aio_wait(); | |
2600 | } | |
2601 | return data.ret; | |
f58c7b35 TS |
2602 | } |
2603 | ||
188a7bbf PB |
2604 | /* |
2605 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
2606 | * | |
2607 | * Return true if the given sector is allocated in any image between | |
2608 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
2609 | * sector is allocated in any image of the chain. Return false otherwise. | |
2610 | * | |
2611 | * 'pnum' is set to the number of sectors (including and immediately following | |
2612 | * the specified sector) that are known to be in the same | |
2613 | * allocated/unallocated state. | |
2614 | * | |
2615 | */ | |
2616 | int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, | |
2617 | BlockDriverState *base, | |
2618 | int64_t sector_num, | |
2619 | int nb_sectors, int *pnum) | |
2620 | { | |
2621 | BlockDriverState *intermediate; | |
2622 | int ret, n = nb_sectors; | |
2623 | ||
2624 | intermediate = top; | |
2625 | while (intermediate && intermediate != base) { | |
2626 | int pnum_inter; | |
2627 | ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors, | |
2628 | &pnum_inter); | |
2629 | if (ret < 0) { | |
2630 | return ret; | |
2631 | } else if (ret) { | |
2632 | *pnum = pnum_inter; | |
2633 | return 1; | |
2634 | } | |
2635 | ||
2636 | /* | |
2637 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
2638 | * might have | |
2639 | * | |
2640 | * [sector_num+x, nr_sectors] allocated. | |
2641 | */ | |
2642 | if (n > pnum_inter) { | |
2643 | n = pnum_inter; | |
2644 | } | |
2645 | ||
2646 | intermediate = intermediate->backing_hd; | |
2647 | } | |
2648 | ||
2649 | *pnum = n; | |
2650 | return 0; | |
2651 | } | |
2652 | ||
b2023818 | 2653 | BlockInfoList *qmp_query_block(Error **errp) |
b338082b | 2654 | { |
b2023818 | 2655 | BlockInfoList *head = NULL, *cur_item = NULL; |
b338082b FB |
2656 | BlockDriverState *bs; |
2657 | ||
1b7bdbc1 | 2658 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
b2023818 | 2659 | BlockInfoList *info = g_malloc0(sizeof(*info)); |
d15e5465 | 2660 | |
b2023818 LC |
2661 | info->value = g_malloc0(sizeof(*info->value)); |
2662 | info->value->device = g_strdup(bs->device_name); | |
2663 | info->value->type = g_strdup("unknown"); | |
2664 | info->value->locked = bdrv_dev_is_medium_locked(bs); | |
2665 | info->value->removable = bdrv_dev_has_removable_media(bs); | |
d15e5465 | 2666 | |
e4def80b | 2667 | if (bdrv_dev_has_removable_media(bs)) { |
b2023818 LC |
2668 | info->value->has_tray_open = true; |
2669 | info->value->tray_open = bdrv_dev_is_tray_open(bs); | |
e4def80b | 2670 | } |
f04ef601 LC |
2671 | |
2672 | if (bdrv_iostatus_is_enabled(bs)) { | |
b2023818 LC |
2673 | info->value->has_io_status = true; |
2674 | info->value->io_status = bs->iostatus; | |
f04ef601 LC |
2675 | } |
2676 | ||
19cb3738 | 2677 | if (bs->drv) { |
b2023818 LC |
2678 | info->value->has_inserted = true; |
2679 | info->value->inserted = g_malloc0(sizeof(*info->value->inserted)); | |
2680 | info->value->inserted->file = g_strdup(bs->filename); | |
2681 | info->value->inserted->ro = bs->read_only; | |
2682 | info->value->inserted->drv = g_strdup(bs->drv->format_name); | |
2683 | info->value->inserted->encrypted = bs->encrypted; | |
2684 | if (bs->backing_file[0]) { | |
2685 | info->value->inserted->has_backing_file = true; | |
2686 | info->value->inserted->backing_file = g_strdup(bs->backing_file); | |
376253ec | 2687 | } |
727f005e ZYW |
2688 | |
2689 | if (bs->io_limits_enabled) { | |
2690 | info->value->inserted->bps = | |
2691 | bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
2692 | info->value->inserted->bps_rd = | |
2693 | bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; | |
2694 | info->value->inserted->bps_wr = | |
2695 | bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; | |
2696 | info->value->inserted->iops = | |
2697 | bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
2698 | info->value->inserted->iops_rd = | |
2699 | bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; | |
2700 | info->value->inserted->iops_wr = | |
2701 | bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; | |
2702 | } | |
b2023818 | 2703 | } |
d15e5465 | 2704 | |
b2023818 LC |
2705 | /* XXX: waiting for the qapi to support GSList */ |
2706 | if (!cur_item) { | |
2707 | head = cur_item = info; | |
2708 | } else { | |
2709 | cur_item->next = info; | |
2710 | cur_item = info; | |
b338082b | 2711 | } |
b338082b | 2712 | } |
d15e5465 | 2713 | |
b2023818 | 2714 | return head; |
b338082b | 2715 | } |
a36e69dd | 2716 | |
f11f57e4 LC |
2717 | /* Consider exposing this as a full fledged QMP command */ |
2718 | static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) | |
2719 | { | |
2720 | BlockStats *s; | |
2721 | ||
2722 | s = g_malloc0(sizeof(*s)); | |
2723 | ||
2724 | if (bs->device_name[0]) { | |
2725 | s->has_device = true; | |
2726 | s->device = g_strdup(bs->device_name); | |
294cc35f KW |
2727 | } |
2728 | ||
f11f57e4 LC |
2729 | s->stats = g_malloc0(sizeof(*s->stats)); |
2730 | s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; | |
2731 | s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; | |
2732 | s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; | |
2733 | s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; | |
2734 | s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; | |
2735 | s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; | |
2736 | s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; | |
2737 | s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; | |
2738 | s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; | |
2739 | ||
294cc35f | 2740 | if (bs->file) { |
f11f57e4 LC |
2741 | s->has_parent = true; |
2742 | s->parent = qmp_query_blockstat(bs->file, NULL); | |
294cc35f KW |
2743 | } |
2744 | ||
f11f57e4 | 2745 | return s; |
294cc35f KW |
2746 | } |
2747 | ||
f11f57e4 | 2748 | BlockStatsList *qmp_query_blockstats(Error **errp) |
218a536a | 2749 | { |
f11f57e4 | 2750 | BlockStatsList *head = NULL, *cur_item = NULL; |
a36e69dd TS |
2751 | BlockDriverState *bs; |
2752 | ||
1b7bdbc1 | 2753 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f11f57e4 LC |
2754 | BlockStatsList *info = g_malloc0(sizeof(*info)); |
2755 | info->value = qmp_query_blockstat(bs, NULL); | |
2756 | ||
2757 | /* XXX: waiting for the qapi to support GSList */ | |
2758 | if (!cur_item) { | |
2759 | head = cur_item = info; | |
2760 | } else { | |
2761 | cur_item->next = info; | |
2762 | cur_item = info; | |
2763 | } | |
a36e69dd | 2764 | } |
218a536a | 2765 | |
f11f57e4 | 2766 | return head; |
a36e69dd | 2767 | } |
ea2384d3 | 2768 | |
045df330 AL |
2769 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
2770 | { | |
2771 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2772 | return bs->backing_file; | |
2773 | else if (bs->encrypted) | |
2774 | return bs->filename; | |
2775 | else | |
2776 | return NULL; | |
2777 | } | |
2778 | ||
5fafdf24 | 2779 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
2780 | char *filename, int filename_size) |
2781 | { | |
3574c608 | 2782 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
2783 | } |
2784 | ||
5fafdf24 | 2785 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
2786 | const uint8_t *buf, int nb_sectors) |
2787 | { | |
2788 | BlockDriver *drv = bs->drv; | |
2789 | if (!drv) | |
19cb3738 | 2790 | return -ENOMEDIUM; |
faea38e7 FB |
2791 | if (!drv->bdrv_write_compressed) |
2792 | return -ENOTSUP; | |
fbb7b4e0 KW |
2793 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2794 | return -EIO; | |
a55eb92c | 2795 | |
c6d22830 | 2796 | if (bs->dirty_bitmap) { |
7cd1e32a | 2797 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
2798 | } | |
a55eb92c | 2799 | |
faea38e7 FB |
2800 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
2801 | } | |
3b46e624 | 2802 | |
faea38e7 FB |
2803 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
2804 | { | |
2805 | BlockDriver *drv = bs->drv; | |
2806 | if (!drv) | |
19cb3738 | 2807 | return -ENOMEDIUM; |
faea38e7 FB |
2808 | if (!drv->bdrv_get_info) |
2809 | return -ENOTSUP; | |
2810 | memset(bdi, 0, sizeof(*bdi)); | |
2811 | return drv->bdrv_get_info(bs, bdi); | |
2812 | } | |
2813 | ||
45566e9c CH |
2814 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
2815 | int64_t pos, int size) | |
178e08a5 AL |
2816 | { |
2817 | BlockDriver *drv = bs->drv; | |
2818 | if (!drv) | |
2819 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2820 | if (drv->bdrv_save_vmstate) |
2821 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
2822 | if (bs->file) | |
2823 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
2824 | return -ENOTSUP; | |
178e08a5 AL |
2825 | } |
2826 | ||
45566e9c CH |
2827 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2828 | int64_t pos, int size) | |
178e08a5 AL |
2829 | { |
2830 | BlockDriver *drv = bs->drv; | |
2831 | if (!drv) | |
2832 | return -ENOMEDIUM; | |
7cdb1f6d MK |
2833 | if (drv->bdrv_load_vmstate) |
2834 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
2835 | if (bs->file) | |
2836 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
2837 | return -ENOTSUP; | |
178e08a5 AL |
2838 | } |
2839 | ||
8b9b0cc2 KW |
2840 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
2841 | { | |
2842 | BlockDriver *drv = bs->drv; | |
2843 | ||
2844 | if (!drv || !drv->bdrv_debug_event) { | |
2845 | return; | |
2846 | } | |
2847 | ||
2848 | return drv->bdrv_debug_event(bs, event); | |
2849 | ||
2850 | } | |
2851 | ||
faea38e7 FB |
2852 | /**************************************************************/ |
2853 | /* handling of snapshots */ | |
2854 | ||
feeee5ac MDCF |
2855 | int bdrv_can_snapshot(BlockDriverState *bs) |
2856 | { | |
2857 | BlockDriver *drv = bs->drv; | |
07b70bfb | 2858 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
feeee5ac MDCF |
2859 | return 0; |
2860 | } | |
2861 | ||
2862 | if (!drv->bdrv_snapshot_create) { | |
2863 | if (bs->file != NULL) { | |
2864 | return bdrv_can_snapshot(bs->file); | |
2865 | } | |
2866 | return 0; | |
2867 | } | |
2868 | ||
2869 | return 1; | |
2870 | } | |
2871 | ||
199630b6 BS |
2872 | int bdrv_is_snapshot(BlockDriverState *bs) |
2873 | { | |
2874 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
2875 | } | |
2876 | ||
f9092b10 MA |
2877 | BlockDriverState *bdrv_snapshots(void) |
2878 | { | |
2879 | BlockDriverState *bs; | |
2880 | ||
3ac906f7 | 2881 | if (bs_snapshots) { |
f9092b10 | 2882 | return bs_snapshots; |
3ac906f7 | 2883 | } |
f9092b10 MA |
2884 | |
2885 | bs = NULL; | |
2886 | while ((bs = bdrv_next(bs))) { | |
2887 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
2888 | bs_snapshots = bs; |
2889 | return bs; | |
f9092b10 MA |
2890 | } |
2891 | } | |
2892 | return NULL; | |
f9092b10 MA |
2893 | } |
2894 | ||
5fafdf24 | 2895 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
2896 | QEMUSnapshotInfo *sn_info) |
2897 | { | |
2898 | BlockDriver *drv = bs->drv; | |
2899 | if (!drv) | |
19cb3738 | 2900 | return -ENOMEDIUM; |
7cdb1f6d MK |
2901 | if (drv->bdrv_snapshot_create) |
2902 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2903 | if (bs->file) | |
2904 | return bdrv_snapshot_create(bs->file, sn_info); | |
2905 | return -ENOTSUP; | |
faea38e7 FB |
2906 | } |
2907 | ||
5fafdf24 | 2908 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
2909 | const char *snapshot_id) |
2910 | { | |
2911 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
2912 | int ret, open_ret; |
2913 | ||
faea38e7 | 2914 | if (!drv) |
19cb3738 | 2915 | return -ENOMEDIUM; |
7cdb1f6d MK |
2916 | if (drv->bdrv_snapshot_goto) |
2917 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2918 | ||
2919 | if (bs->file) { | |
2920 | drv->bdrv_close(bs); | |
2921 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2922 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2923 | if (open_ret < 0) { | |
2924 | bdrv_delete(bs->file); | |
2925 | bs->drv = NULL; | |
2926 | return open_ret; | |
2927 | } | |
2928 | return ret; | |
2929 | } | |
2930 | ||
2931 | return -ENOTSUP; | |
faea38e7 FB |
2932 | } |
2933 | ||
2934 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2935 | { | |
2936 | BlockDriver *drv = bs->drv; | |
2937 | if (!drv) | |
19cb3738 | 2938 | return -ENOMEDIUM; |
7cdb1f6d MK |
2939 | if (drv->bdrv_snapshot_delete) |
2940 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2941 | if (bs->file) | |
2942 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2943 | return -ENOTSUP; | |
faea38e7 FB |
2944 | } |
2945 | ||
5fafdf24 | 2946 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
2947 | QEMUSnapshotInfo **psn_info) |
2948 | { | |
2949 | BlockDriver *drv = bs->drv; | |
2950 | if (!drv) | |
19cb3738 | 2951 | return -ENOMEDIUM; |
7cdb1f6d MK |
2952 | if (drv->bdrv_snapshot_list) |
2953 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2954 | if (bs->file) | |
2955 | return bdrv_snapshot_list(bs->file, psn_info); | |
2956 | return -ENOTSUP; | |
faea38e7 FB |
2957 | } |
2958 | ||
51ef6727 | 2959 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
2960 | const char *snapshot_name) | |
2961 | { | |
2962 | BlockDriver *drv = bs->drv; | |
2963 | if (!drv) { | |
2964 | return -ENOMEDIUM; | |
2965 | } | |
2966 | if (!bs->read_only) { | |
2967 | return -EINVAL; | |
2968 | } | |
2969 | if (drv->bdrv_snapshot_load_tmp) { | |
2970 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2971 | } | |
2972 | return -ENOTSUP; | |
2973 | } | |
2974 | ||
e8a6bb9c MT |
2975 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
2976 | const char *backing_file) | |
2977 | { | |
2978 | if (!bs->drv) { | |
2979 | return NULL; | |
2980 | } | |
2981 | ||
2982 | if (bs->backing_hd) { | |
2983 | if (strcmp(bs->backing_file, backing_file) == 0) { | |
2984 | return bs->backing_hd; | |
2985 | } else { | |
2986 | return bdrv_find_backing_image(bs->backing_hd, backing_file); | |
2987 | } | |
2988 | } | |
2989 | ||
2990 | return NULL; | |
2991 | } | |
2992 | ||
faea38e7 FB |
2993 | #define NB_SUFFIXES 4 |
2994 | ||
2995 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2996 | { | |
2997 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2998 | int64_t base; | |
2999 | int i; | |
3000 | ||
3001 | if (size <= 999) { | |
3002 | snprintf(buf, buf_size, "%" PRId64, size); | |
3003 | } else { | |
3004 | base = 1024; | |
3005 | for(i = 0; i < NB_SUFFIXES; i++) { | |
3006 | if (size < (10 * base)) { | |
5fafdf24 | 3007 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
3008 | (double)size / base, |
3009 | suffixes[i]); | |
3010 | break; | |
3011 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 3012 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
3013 | ((size + (base >> 1)) / base), |
3014 | suffixes[i]); | |
3015 | break; | |
3016 | } | |
3017 | base = base * 1024; | |
3018 | } | |
3019 | } | |
3020 | return buf; | |
3021 | } | |
3022 | ||
3023 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
3024 | { | |
3025 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
3026 | #ifdef _WIN32 |
3027 | struct tm *ptm; | |
3028 | #else | |
faea38e7 | 3029 | struct tm tm; |
3b9f94e1 | 3030 | #endif |
faea38e7 FB |
3031 | time_t ti; |
3032 | int64_t secs; | |
3033 | ||
3034 | if (!sn) { | |
5fafdf24 TS |
3035 | snprintf(buf, buf_size, |
3036 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
3037 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
3038 | } else { | |
3039 | ti = sn->date_sec; | |
3b9f94e1 FB |
3040 | #ifdef _WIN32 |
3041 | ptm = localtime(&ti); | |
3042 | strftime(date_buf, sizeof(date_buf), | |
3043 | "%Y-%m-%d %H:%M:%S", ptm); | |
3044 | #else | |
faea38e7 FB |
3045 | localtime_r(&ti, &tm); |
3046 | strftime(date_buf, sizeof(date_buf), | |
3047 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 3048 | #endif |
faea38e7 FB |
3049 | secs = sn->vm_clock_nsec / 1000000000; |
3050 | snprintf(clock_buf, sizeof(clock_buf), | |
3051 | "%02d:%02d:%02d.%03d", | |
3052 | (int)(secs / 3600), | |
3053 | (int)((secs / 60) % 60), | |
5fafdf24 | 3054 | (int)(secs % 60), |
faea38e7 FB |
3055 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
3056 | snprintf(buf, buf_size, | |
5fafdf24 | 3057 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
3058 | sn->id_str, sn->name, |
3059 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
3060 | date_buf, | |
3061 | clock_buf); | |
3062 | } | |
3063 | return buf; | |
3064 | } | |
3065 | ||
ea2384d3 | 3066 | /**************************************************************/ |
83f64091 | 3067 | /* async I/Os */ |
ea2384d3 | 3068 | |
3b69e4b9 | 3069 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3070 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3071 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3072 | { |
bbf0a440 SH |
3073 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3074 | ||
b2a61371 | 3075 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3076 | cb, opaque, false); |
ea2384d3 FB |
3077 | } |
3078 | ||
f141eafe AL |
3079 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3080 | QEMUIOVector *qiov, int nb_sectors, | |
3081 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3082 | { |
bbf0a440 SH |
3083 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3084 | ||
1a6e115b | 3085 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3086 | cb, opaque, true); |
83f64091 FB |
3087 | } |
3088 | ||
40b4f539 KW |
3089 | |
3090 | typedef struct MultiwriteCB { | |
3091 | int error; | |
3092 | int num_requests; | |
3093 | int num_callbacks; | |
3094 | struct { | |
3095 | BlockDriverCompletionFunc *cb; | |
3096 | void *opaque; | |
3097 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3098 | } callbacks[]; |
3099 | } MultiwriteCB; | |
3100 | ||
3101 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3102 | { | |
3103 | int i; | |
3104 | ||
3105 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3106 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3107 | if (mcb->callbacks[i].free_qiov) { |
3108 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3109 | } | |
7267c094 | 3110 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3111 | } |
3112 | } | |
3113 | ||
3114 | static void multiwrite_cb(void *opaque, int ret) | |
3115 | { | |
3116 | MultiwriteCB *mcb = opaque; | |
3117 | ||
6d519a5f SH |
3118 | trace_multiwrite_cb(mcb, ret); |
3119 | ||
cb6d3ca0 | 3120 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3121 | mcb->error = ret; |
40b4f539 KW |
3122 | } |
3123 | ||
3124 | mcb->num_requests--; | |
3125 | if (mcb->num_requests == 0) { | |
de189a1b | 3126 | multiwrite_user_cb(mcb); |
7267c094 | 3127 | g_free(mcb); |
40b4f539 KW |
3128 | } |
3129 | } | |
3130 | ||
3131 | static int multiwrite_req_compare(const void *a, const void *b) | |
3132 | { | |
77be4366 CH |
3133 | const BlockRequest *req1 = a, *req2 = b; |
3134 | ||
3135 | /* | |
3136 | * Note that we can't simply subtract req2->sector from req1->sector | |
3137 | * here as that could overflow the return value. | |
3138 | */ | |
3139 | if (req1->sector > req2->sector) { | |
3140 | return 1; | |
3141 | } else if (req1->sector < req2->sector) { | |
3142 | return -1; | |
3143 | } else { | |
3144 | return 0; | |
3145 | } | |
40b4f539 KW |
3146 | } |
3147 | ||
3148 | /* | |
3149 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3150 | * requests that remain after merging. | |
3151 | */ | |
3152 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3153 | int num_reqs, MultiwriteCB *mcb) | |
3154 | { | |
3155 | int i, outidx; | |
3156 | ||
3157 | // Sort requests by start sector | |
3158 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3159 | ||
3160 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3161 | // filling up gaps with zero sectors. | |
3162 | outidx = 0; | |
3163 | for (i = 1; i < num_reqs; i++) { | |
3164 | int merge = 0; | |
3165 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3166 | ||
b6a127a1 | 3167 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3168 | if (reqs[i].sector <= oldreq_last) { |
3169 | merge = 1; | |
3170 | } | |
3171 | ||
e2a305fb CH |
3172 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3173 | merge = 0; | |
3174 | } | |
3175 | ||
40b4f539 KW |
3176 | if (merge) { |
3177 | size_t size; | |
7267c094 | 3178 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3179 | qemu_iovec_init(qiov, |
3180 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3181 | ||
3182 | // Add the first request to the merged one. If the requests are | |
3183 | // overlapping, drop the last sectors of the first request. | |
3184 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
3185 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
3186 | ||
b6a127a1 PB |
3187 | // We should need to add any zeros between the two requests |
3188 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3189 | |
3190 | // Add the second request | |
3191 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
3192 | ||
cbf1dff2 | 3193 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3194 | reqs[outidx].qiov = qiov; |
3195 | ||
3196 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3197 | } else { | |
3198 | outidx++; | |
3199 | reqs[outidx].sector = reqs[i].sector; | |
3200 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3201 | reqs[outidx].qiov = reqs[i].qiov; | |
3202 | } | |
3203 | } | |
3204 | ||
3205 | return outidx + 1; | |
3206 | } | |
3207 | ||
3208 | /* | |
3209 | * Submit multiple AIO write requests at once. | |
3210 | * | |
3211 | * On success, the function returns 0 and all requests in the reqs array have | |
3212 | * been submitted. In error case this function returns -1, and any of the | |
3213 | * requests may or may not be submitted yet. In particular, this means that the | |
3214 | * callback will be called for some of the requests, for others it won't. The | |
3215 | * caller must check the error field of the BlockRequest to wait for the right | |
3216 | * callbacks (if error != 0, no callback will be called). | |
3217 | * | |
3218 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3219 | * requests. However, the fields opaque and error are left unmodified as they | |
3220 | * are used to signal failure for a single request to the caller. | |
3221 | */ | |
3222 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3223 | { | |
40b4f539 KW |
3224 | MultiwriteCB *mcb; |
3225 | int i; | |
3226 | ||
301db7c2 RH |
3227 | /* don't submit writes if we don't have a medium */ |
3228 | if (bs->drv == NULL) { | |
3229 | for (i = 0; i < num_reqs; i++) { | |
3230 | reqs[i].error = -ENOMEDIUM; | |
3231 | } | |
3232 | return -1; | |
3233 | } | |
3234 | ||
40b4f539 KW |
3235 | if (num_reqs == 0) { |
3236 | return 0; | |
3237 | } | |
3238 | ||
3239 | // Create MultiwriteCB structure | |
7267c094 | 3240 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3241 | mcb->num_requests = 0; |
3242 | mcb->num_callbacks = num_reqs; | |
3243 | ||
3244 | for (i = 0; i < num_reqs; i++) { | |
3245 | mcb->callbacks[i].cb = reqs[i].cb; | |
3246 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3247 | } | |
3248 | ||
3249 | // Check for mergable requests | |
3250 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3251 | ||
6d519a5f SH |
3252 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3253 | ||
df9309fb PB |
3254 | /* Run the aio requests. */ |
3255 | mcb->num_requests = num_reqs; | |
40b4f539 | 3256 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3257 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3258 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3259 | } |
3260 | ||
3261 | return 0; | |
40b4f539 KW |
3262 | } |
3263 | ||
83f64091 | 3264 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3265 | { |
6bbff9a0 | 3266 | acb->pool->cancel(acb); |
83f64091 FB |
3267 | } |
3268 | ||
98f90dba ZYW |
3269 | /* block I/O throttling */ |
3270 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, | |
3271 | bool is_write, double elapsed_time, uint64_t *wait) | |
3272 | { | |
3273 | uint64_t bps_limit = 0; | |
3274 | double bytes_limit, bytes_base, bytes_res; | |
3275 | double slice_time, wait_time; | |
3276 | ||
3277 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3278 | bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
3279 | } else if (bs->io_limits.bps[is_write]) { | |
3280 | bps_limit = bs->io_limits.bps[is_write]; | |
3281 | } else { | |
3282 | if (wait) { | |
3283 | *wait = 0; | |
3284 | } | |
3285 | ||
3286 | return false; | |
3287 | } | |
3288 | ||
3289 | slice_time = bs->slice_end - bs->slice_start; | |
3290 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3291 | bytes_limit = bps_limit * slice_time; | |
3292 | bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; | |
3293 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3294 | bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; | |
3295 | } | |
3296 | ||
3297 | /* bytes_base: the bytes of data which have been read/written; and | |
3298 | * it is obtained from the history statistic info. | |
3299 | * bytes_res: the remaining bytes of data which need to be read/written. | |
3300 | * (bytes_base + bytes_res) / bps_limit: used to calcuate | |
3301 | * the total time for completing reading/writting all data. | |
3302 | */ | |
3303 | bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
3304 | ||
3305 | if (bytes_base + bytes_res <= bytes_limit) { | |
3306 | if (wait) { | |
3307 | *wait = 0; | |
3308 | } | |
3309 | ||
3310 | return false; | |
3311 | } | |
3312 | ||
3313 | /* Calc approx time to dispatch */ | |
3314 | wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; | |
3315 | ||
3316 | /* When the I/O rate at runtime exceeds the limits, | |
3317 | * bs->slice_end need to be extended in order that the current statistic | |
3318 | * info can be kept until the timer fire, so it is increased and tuned | |
3319 | * based on the result of experiment. | |
3320 | */ | |
3321 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3322 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3323 | if (wait) { | |
3324 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3325 | } | |
3326 | ||
3327 | return true; | |
3328 | } | |
3329 | ||
3330 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
3331 | double elapsed_time, uint64_t *wait) | |
3332 | { | |
3333 | uint64_t iops_limit = 0; | |
3334 | double ios_limit, ios_base; | |
3335 | double slice_time, wait_time; | |
3336 | ||
3337 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3338 | iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
3339 | } else if (bs->io_limits.iops[is_write]) { | |
3340 | iops_limit = bs->io_limits.iops[is_write]; | |
3341 | } else { | |
3342 | if (wait) { | |
3343 | *wait = 0; | |
3344 | } | |
3345 | ||
3346 | return false; | |
3347 | } | |
3348 | ||
3349 | slice_time = bs->slice_end - bs->slice_start; | |
3350 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3351 | ios_limit = iops_limit * slice_time; | |
3352 | ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; | |
3353 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3354 | ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; | |
3355 | } | |
3356 | ||
3357 | if (ios_base + 1 <= ios_limit) { | |
3358 | if (wait) { | |
3359 | *wait = 0; | |
3360 | } | |
3361 | ||
3362 | return false; | |
3363 | } | |
3364 | ||
3365 | /* Calc approx time to dispatch */ | |
3366 | wait_time = (ios_base + 1) / iops_limit; | |
3367 | if (wait_time > elapsed_time) { | |
3368 | wait_time = wait_time - elapsed_time; | |
3369 | } else { | |
3370 | wait_time = 0; | |
3371 | } | |
3372 | ||
3373 | bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3374 | bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME; | |
3375 | if (wait) { | |
3376 | *wait = wait_time * BLOCK_IO_SLICE_TIME * 10; | |
3377 | } | |
3378 | ||
3379 | return true; | |
3380 | } | |
3381 | ||
3382 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
3383 | bool is_write, int64_t *wait) | |
3384 | { | |
3385 | int64_t now, max_wait; | |
3386 | uint64_t bps_wait = 0, iops_wait = 0; | |
3387 | double elapsed_time; | |
3388 | int bps_ret, iops_ret; | |
3389 | ||
3390 | now = qemu_get_clock_ns(vm_clock); | |
3391 | if ((bs->slice_start < now) | |
3392 | && (bs->slice_end > now)) { | |
3393 | bs->slice_end = now + bs->slice_time; | |
3394 | } else { | |
3395 | bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; | |
3396 | bs->slice_start = now; | |
3397 | bs->slice_end = now + bs->slice_time; | |
3398 | ||
3399 | bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; | |
3400 | bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; | |
3401 | ||
3402 | bs->io_base.ios[is_write] = bs->nr_ops[is_write]; | |
3403 | bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; | |
3404 | } | |
3405 | ||
3406 | elapsed_time = now - bs->slice_start; | |
3407 | elapsed_time /= (NANOSECONDS_PER_SECOND); | |
3408 | ||
3409 | bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, | |
3410 | is_write, elapsed_time, &bps_wait); | |
3411 | iops_ret = bdrv_exceed_iops_limits(bs, is_write, | |
3412 | elapsed_time, &iops_wait); | |
3413 | if (bps_ret || iops_ret) { | |
3414 | max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; | |
3415 | if (wait) { | |
3416 | *wait = max_wait; | |
3417 | } | |
3418 | ||
3419 | now = qemu_get_clock_ns(vm_clock); | |
3420 | if (bs->slice_end < now + max_wait) { | |
3421 | bs->slice_end = now + max_wait; | |
3422 | } | |
3423 | ||
3424 | return true; | |
3425 | } | |
3426 | ||
3427 | if (wait) { | |
3428 | *wait = 0; | |
3429 | } | |
3430 | ||
3431 | return false; | |
3432 | } | |
ce1a14dc | 3433 | |
83f64091 FB |
3434 | /**************************************************************/ |
3435 | /* async block device emulation */ | |
3436 | ||
c16b5a2c CH |
3437 | typedef struct BlockDriverAIOCBSync { |
3438 | BlockDriverAIOCB common; | |
3439 | QEMUBH *bh; | |
3440 | int ret; | |
3441 | /* vector translation state */ | |
3442 | QEMUIOVector *qiov; | |
3443 | uint8_t *bounce; | |
3444 | int is_write; | |
3445 | } BlockDriverAIOCBSync; | |
3446 | ||
3447 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3448 | { | |
b666d239 KW |
3449 | BlockDriverAIOCBSync *acb = |
3450 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3451 | qemu_bh_delete(acb->bh); |
36afc451 | 3452 | acb->bh = NULL; |
c16b5a2c CH |
3453 | qemu_aio_release(acb); |
3454 | } | |
3455 | ||
3456 | static AIOPool bdrv_em_aio_pool = { | |
3457 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
3458 | .cancel = bdrv_aio_cancel_em, | |
3459 | }; | |
3460 | ||
ce1a14dc | 3461 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3462 | { |
ce1a14dc | 3463 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3464 | |
f141eafe AL |
3465 | if (!acb->is_write) |
3466 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 3467 | qemu_vfree(acb->bounce); |
ce1a14dc | 3468 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3469 | qemu_bh_delete(acb->bh); |
36afc451 | 3470 | acb->bh = NULL; |
ce1a14dc | 3471 | qemu_aio_release(acb); |
83f64091 | 3472 | } |
beac80cd | 3473 | |
f141eafe AL |
3474 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3475 | int64_t sector_num, | |
3476 | QEMUIOVector *qiov, | |
3477 | int nb_sectors, | |
3478 | BlockDriverCompletionFunc *cb, | |
3479 | void *opaque, | |
3480 | int is_write) | |
3481 | ||
83f64091 | 3482 | { |
ce1a14dc | 3483 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3484 | |
c16b5a2c | 3485 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
3486 | acb->is_write = is_write; |
3487 | acb->qiov = qiov; | |
e268ca52 | 3488 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3489 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3490 | |
3491 | if (is_write) { | |
3492 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1ed20acf | 3493 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3494 | } else { |
1ed20acf | 3495 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3496 | } |
3497 | ||
ce1a14dc | 3498 | qemu_bh_schedule(acb->bh); |
f141eafe | 3499 | |
ce1a14dc | 3500 | return &acb->common; |
beac80cd FB |
3501 | } |
3502 | ||
f141eafe AL |
3503 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3504 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3505 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3506 | { |
f141eafe AL |
3507 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3508 | } | |
83f64091 | 3509 | |
f141eafe AL |
3510 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3511 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3512 | BlockDriverCompletionFunc *cb, void *opaque) | |
3513 | { | |
3514 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3515 | } |
beac80cd | 3516 | |
68485420 KW |
3517 | |
3518 | typedef struct BlockDriverAIOCBCoroutine { | |
3519 | BlockDriverAIOCB common; | |
3520 | BlockRequest req; | |
3521 | bool is_write; | |
3522 | QEMUBH* bh; | |
3523 | } BlockDriverAIOCBCoroutine; | |
3524 | ||
3525 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3526 | { | |
3527 | qemu_aio_flush(); | |
3528 | } | |
3529 | ||
3530 | static AIOPool bdrv_em_co_aio_pool = { | |
3531 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), | |
3532 | .cancel = bdrv_aio_co_cancel_em, | |
3533 | }; | |
3534 | ||
35246a68 | 3535 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3536 | { |
3537 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3538 | ||
3539 | acb->common.cb(acb->common.opaque, acb->req.error); | |
3540 | qemu_bh_delete(acb->bh); | |
3541 | qemu_aio_release(acb); | |
3542 | } | |
3543 | ||
b2a61371 SH |
3544 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3545 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3546 | { | |
3547 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3548 | BlockDriverState *bs = acb->common.bs; | |
3549 | ||
3550 | if (!acb->is_write) { | |
3551 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3552 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3553 | } else { |
3554 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3555 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3556 | } |
3557 | ||
35246a68 | 3558 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3559 | qemu_bh_schedule(acb->bh); |
3560 | } | |
3561 | ||
68485420 KW |
3562 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3563 | int64_t sector_num, | |
3564 | QEMUIOVector *qiov, | |
3565 | int nb_sectors, | |
3566 | BlockDriverCompletionFunc *cb, | |
3567 | void *opaque, | |
8c5873d6 | 3568 | bool is_write) |
68485420 KW |
3569 | { |
3570 | Coroutine *co; | |
3571 | BlockDriverAIOCBCoroutine *acb; | |
3572 | ||
3573 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3574 | acb->req.sector = sector_num; | |
3575 | acb->req.nb_sectors = nb_sectors; | |
3576 | acb->req.qiov = qiov; | |
3577 | acb->is_write = is_write; | |
3578 | ||
8c5873d6 | 3579 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3580 | qemu_coroutine_enter(co, acb); |
3581 | ||
3582 | return &acb->common; | |
3583 | } | |
3584 | ||
07f07615 | 3585 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3586 | { |
07f07615 PB |
3587 | BlockDriverAIOCBCoroutine *acb = opaque; |
3588 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3589 | |
07f07615 PB |
3590 | acb->req.error = bdrv_co_flush(bs); |
3591 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3592 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3593 | } |
3594 | ||
07f07615 | 3595 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3596 | BlockDriverCompletionFunc *cb, void *opaque) |
3597 | { | |
07f07615 | 3598 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3599 | |
07f07615 PB |
3600 | Coroutine *co; |
3601 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3602 | |
07f07615 PB |
3603 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
3604 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); | |
3605 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3606 | |
016f5cf6 AG |
3607 | return &acb->common; |
3608 | } | |
3609 | ||
4265d620 PB |
3610 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3611 | { | |
3612 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3613 | BlockDriverState *bs = acb->common.bs; | |
3614 | ||
3615 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3616 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3617 | qemu_bh_schedule(acb->bh); | |
3618 | } | |
3619 | ||
3620 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3621 | int64_t sector_num, int nb_sectors, | |
3622 | BlockDriverCompletionFunc *cb, void *opaque) | |
3623 | { | |
3624 | Coroutine *co; | |
3625 | BlockDriverAIOCBCoroutine *acb; | |
3626 | ||
3627 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3628 | ||
3629 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
3630 | acb->req.sector = sector_num; | |
3631 | acb->req.nb_sectors = nb_sectors; | |
3632 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
3633 | qemu_coroutine_enter(co, acb); | |
3634 | ||
3635 | return &acb->common; | |
3636 | } | |
3637 | ||
ea2384d3 FB |
3638 | void bdrv_init(void) |
3639 | { | |
5efa9d5a | 3640 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3641 | } |
ce1a14dc | 3642 | |
eb852011 MA |
3643 | void bdrv_init_with_whitelist(void) |
3644 | { | |
3645 | use_bdrv_whitelist = 1; | |
3646 | bdrv_init(); | |
3647 | } | |
3648 | ||
c16b5a2c CH |
3649 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
3650 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 3651 | { |
ce1a14dc PB |
3652 | BlockDriverAIOCB *acb; |
3653 | ||
6bbff9a0 AL |
3654 | if (pool->free_aiocb) { |
3655 | acb = pool->free_aiocb; | |
3656 | pool->free_aiocb = acb->next; | |
ce1a14dc | 3657 | } else { |
7267c094 | 3658 | acb = g_malloc0(pool->aiocb_size); |
6bbff9a0 | 3659 | acb->pool = pool; |
ce1a14dc PB |
3660 | } |
3661 | acb->bs = bs; | |
3662 | acb->cb = cb; | |
3663 | acb->opaque = opaque; | |
3664 | return acb; | |
3665 | } | |
3666 | ||
3667 | void qemu_aio_release(void *p) | |
3668 | { | |
6bbff9a0 AL |
3669 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
3670 | AIOPool *pool = acb->pool; | |
3671 | acb->next = pool->free_aiocb; | |
3672 | pool->free_aiocb = acb; | |
ce1a14dc | 3673 | } |
19cb3738 | 3674 | |
f9f05dc5 KW |
3675 | /**************************************************************/ |
3676 | /* Coroutine block device emulation */ | |
3677 | ||
3678 | typedef struct CoroutineIOCompletion { | |
3679 | Coroutine *coroutine; | |
3680 | int ret; | |
3681 | } CoroutineIOCompletion; | |
3682 | ||
3683 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3684 | { | |
3685 | CoroutineIOCompletion *co = opaque; | |
3686 | ||
3687 | co->ret = ret; | |
3688 | qemu_coroutine_enter(co->coroutine, NULL); | |
3689 | } | |
3690 | ||
3691 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3692 | int nb_sectors, QEMUIOVector *iov, | |
3693 | bool is_write) | |
3694 | { | |
3695 | CoroutineIOCompletion co = { | |
3696 | .coroutine = qemu_coroutine_self(), | |
3697 | }; | |
3698 | BlockDriverAIOCB *acb; | |
3699 | ||
3700 | if (is_write) { | |
a652d160 SH |
3701 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3702 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3703 | } else { |
a652d160 SH |
3704 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3705 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3706 | } |
3707 | ||
59370aaa | 3708 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3709 | if (!acb) { |
3710 | return -EIO; | |
3711 | } | |
3712 | qemu_coroutine_yield(); | |
3713 | ||
3714 | return co.ret; | |
3715 | } | |
3716 | ||
3717 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
3718 | int64_t sector_num, int nb_sectors, | |
3719 | QEMUIOVector *iov) | |
3720 | { | |
3721 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
3722 | } | |
3723 | ||
3724 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
3725 | int64_t sector_num, int nb_sectors, | |
3726 | QEMUIOVector *iov) | |
3727 | { | |
3728 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
3729 | } | |
3730 | ||
07f07615 | 3731 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 3732 | { |
07f07615 PB |
3733 | RwCo *rwco = opaque; |
3734 | ||
3735 | rwco->ret = bdrv_co_flush(rwco->bs); | |
3736 | } | |
3737 | ||
3738 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
3739 | { | |
eb489bb1 KW |
3740 | int ret; |
3741 | ||
29cdb251 | 3742 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 3743 | return 0; |
eb489bb1 KW |
3744 | } |
3745 | ||
ca716364 | 3746 | /* Write back cached data to the OS even with cache=unsafe */ |
eb489bb1 KW |
3747 | if (bs->drv->bdrv_co_flush_to_os) { |
3748 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
3749 | if (ret < 0) { | |
3750 | return ret; | |
3751 | } | |
3752 | } | |
3753 | ||
ca716364 KW |
3754 | /* But don't actually force it to the disk with cache=unsafe */ |
3755 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
3756 | return 0; | |
3757 | } | |
3758 | ||
eb489bb1 | 3759 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 3760 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
3761 | } else if (bs->drv->bdrv_aio_flush) { |
3762 | BlockDriverAIOCB *acb; | |
3763 | CoroutineIOCompletion co = { | |
3764 | .coroutine = qemu_coroutine_self(), | |
3765 | }; | |
3766 | ||
3767 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
3768 | if (acb == NULL) { | |
29cdb251 | 3769 | ret = -EIO; |
07f07615 PB |
3770 | } else { |
3771 | qemu_coroutine_yield(); | |
29cdb251 | 3772 | ret = co.ret; |
07f07615 | 3773 | } |
07f07615 PB |
3774 | } else { |
3775 | /* | |
3776 | * Some block drivers always operate in either writethrough or unsafe | |
3777 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
3778 | * know how the server works (because the behaviour is hardcoded or | |
3779 | * depends on server-side configuration), so we can't ensure that | |
3780 | * everything is safe on disk. Returning an error doesn't work because | |
3781 | * that would break guests even if the server operates in writethrough | |
3782 | * mode. | |
3783 | * | |
3784 | * Let's hope the user knows what he's doing. | |
3785 | */ | |
29cdb251 | 3786 | ret = 0; |
07f07615 | 3787 | } |
29cdb251 PB |
3788 | if (ret < 0) { |
3789 | return ret; | |
3790 | } | |
3791 | ||
3792 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
3793 | * in the case of cache=unsafe, so there are no useless flushes. | |
3794 | */ | |
3795 | return bdrv_co_flush(bs->file); | |
07f07615 PB |
3796 | } |
3797 | ||
0f15423c AL |
3798 | void bdrv_invalidate_cache(BlockDriverState *bs) |
3799 | { | |
3800 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
3801 | bs->drv->bdrv_invalidate_cache(bs); | |
3802 | } | |
3803 | } | |
3804 | ||
3805 | void bdrv_invalidate_cache_all(void) | |
3806 | { | |
3807 | BlockDriverState *bs; | |
3808 | ||
3809 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
3810 | bdrv_invalidate_cache(bs); | |
3811 | } | |
3812 | } | |
3813 | ||
07789269 BC |
3814 | void bdrv_clear_incoming_migration_all(void) |
3815 | { | |
3816 | BlockDriverState *bs; | |
3817 | ||
3818 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
3819 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
3820 | } | |
3821 | } | |
3822 | ||
07f07615 PB |
3823 | int bdrv_flush(BlockDriverState *bs) |
3824 | { | |
3825 | Coroutine *co; | |
3826 | RwCo rwco = { | |
3827 | .bs = bs, | |
3828 | .ret = NOT_DONE, | |
e7a8a783 | 3829 | }; |
e7a8a783 | 3830 | |
07f07615 PB |
3831 | if (qemu_in_coroutine()) { |
3832 | /* Fast-path if already in coroutine context */ | |
3833 | bdrv_flush_co_entry(&rwco); | |
3834 | } else { | |
3835 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
3836 | qemu_coroutine_enter(co, &rwco); | |
3837 | while (rwco.ret == NOT_DONE) { | |
3838 | qemu_aio_wait(); | |
3839 | } | |
e7a8a783 | 3840 | } |
07f07615 PB |
3841 | |
3842 | return rwco.ret; | |
e7a8a783 KW |
3843 | } |
3844 | ||
4265d620 PB |
3845 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
3846 | { | |
3847 | RwCo *rwco = opaque; | |
3848 | ||
3849 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
3850 | } | |
3851 | ||
3852 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
3853 | int nb_sectors) | |
3854 | { | |
3855 | if (!bs->drv) { | |
3856 | return -ENOMEDIUM; | |
3857 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
3858 | return -EIO; | |
3859 | } else if (bs->read_only) { | |
3860 | return -EROFS; | |
3861 | } else if (bs->drv->bdrv_co_discard) { | |
3862 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); | |
3863 | } else if (bs->drv->bdrv_aio_discard) { | |
3864 | BlockDriverAIOCB *acb; | |
3865 | CoroutineIOCompletion co = { | |
3866 | .coroutine = qemu_coroutine_self(), | |
3867 | }; | |
3868 | ||
3869 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
3870 | bdrv_co_io_em_complete, &co); | |
3871 | if (acb == NULL) { | |
3872 | return -EIO; | |
3873 | } else { | |
3874 | qemu_coroutine_yield(); | |
3875 | return co.ret; | |
3876 | } | |
4265d620 PB |
3877 | } else { |
3878 | return 0; | |
3879 | } | |
3880 | } | |
3881 | ||
3882 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
3883 | { | |
3884 | Coroutine *co; | |
3885 | RwCo rwco = { | |
3886 | .bs = bs, | |
3887 | .sector_num = sector_num, | |
3888 | .nb_sectors = nb_sectors, | |
3889 | .ret = NOT_DONE, | |
3890 | }; | |
3891 | ||
3892 | if (qemu_in_coroutine()) { | |
3893 | /* Fast-path if already in coroutine context */ | |
3894 | bdrv_discard_co_entry(&rwco); | |
3895 | } else { | |
3896 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
3897 | qemu_coroutine_enter(co, &rwco); | |
3898 | while (rwco.ret == NOT_DONE) { | |
3899 | qemu_aio_wait(); | |
3900 | } | |
3901 | } | |
3902 | ||
3903 | return rwco.ret; | |
3904 | } | |
3905 | ||
19cb3738 FB |
3906 | /**************************************************************/ |
3907 | /* removable device support */ | |
3908 | ||
3909 | /** | |
3910 | * Return TRUE if the media is present | |
3911 | */ | |
3912 | int bdrv_is_inserted(BlockDriverState *bs) | |
3913 | { | |
3914 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 3915 | |
19cb3738 FB |
3916 | if (!drv) |
3917 | return 0; | |
3918 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
3919 | return 1; |
3920 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
3921 | } |
3922 | ||
3923 | /** | |
8e49ca46 MA |
3924 | * Return whether the media changed since the last call to this |
3925 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
3926 | */ |
3927 | int bdrv_media_changed(BlockDriverState *bs) | |
3928 | { | |
3929 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3930 | |
8e49ca46 MA |
3931 | if (drv && drv->bdrv_media_changed) { |
3932 | return drv->bdrv_media_changed(bs); | |
3933 | } | |
3934 | return -ENOTSUP; | |
19cb3738 FB |
3935 | } |
3936 | ||
3937 | /** | |
3938 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
3939 | */ | |
f36f3949 | 3940 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
3941 | { |
3942 | BlockDriver *drv = bs->drv; | |
19cb3738 | 3943 | |
822e1cd1 MA |
3944 | if (drv && drv->bdrv_eject) { |
3945 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 3946 | } |
6f382ed2 LC |
3947 | |
3948 | if (bs->device_name[0] != '\0') { | |
3949 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
3950 | } | |
19cb3738 FB |
3951 | } |
3952 | ||
19cb3738 FB |
3953 | /** |
3954 | * Lock or unlock the media (if it is locked, the user won't be able | |
3955 | * to eject it manually). | |
3956 | */ | |
025e849a | 3957 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
3958 | { |
3959 | BlockDriver *drv = bs->drv; | |
3960 | ||
025e849a | 3961 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 3962 | |
025e849a MA |
3963 | if (drv && drv->bdrv_lock_medium) { |
3964 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
3965 | } |
3966 | } | |
985a03b0 TS |
3967 | |
3968 | /* needed for generic scsi interface */ | |
3969 | ||
3970 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
3971 | { | |
3972 | BlockDriver *drv = bs->drv; | |
3973 | ||
3974 | if (drv && drv->bdrv_ioctl) | |
3975 | return drv->bdrv_ioctl(bs, req, buf); | |
3976 | return -ENOTSUP; | |
3977 | } | |
7d780669 | 3978 | |
221f715d AL |
3979 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
3980 | unsigned long int req, void *buf, | |
3981 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 3982 | { |
221f715d | 3983 | BlockDriver *drv = bs->drv; |
7d780669 | 3984 | |
221f715d AL |
3985 | if (drv && drv->bdrv_aio_ioctl) |
3986 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
3987 | return NULL; | |
7d780669 | 3988 | } |
e268ca52 | 3989 | |
7b6f9300 MA |
3990 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
3991 | { | |
3992 | bs->buffer_alignment = align; | |
3993 | } | |
7cd1e32a | 3994 | |
e268ca52 AL |
3995 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
3996 | { | |
3997 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
3998 | } | |
7cd1e32a | 3999 | |
4000 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
4001 | { | |
4002 | int64_t bitmap_size; | |
a55eb92c | 4003 | |
aaa0eb75 | 4004 | bs->dirty_count = 0; |
a55eb92c | 4005 | if (enable) { |
c6d22830 JK |
4006 | if (!bs->dirty_bitmap) { |
4007 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
71df14fc PB |
4008 | BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG - 1; |
4009 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG; | |
a55eb92c | 4010 | |
71df14fc | 4011 | bs->dirty_bitmap = g_new0(unsigned long, bitmap_size); |
a55eb92c | 4012 | } |
7cd1e32a | 4013 | } else { |
c6d22830 | 4014 | if (bs->dirty_bitmap) { |
7267c094 | 4015 | g_free(bs->dirty_bitmap); |
c6d22830 | 4016 | bs->dirty_bitmap = NULL; |
a55eb92c | 4017 | } |
7cd1e32a | 4018 | } |
4019 | } | |
4020 | ||
4021 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
4022 | { | |
6ea44308 | 4023 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 4024 | |
c6d22830 JK |
4025 | if (bs->dirty_bitmap && |
4026 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
6d59fec1 MT |
4027 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
4028 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
7cd1e32a | 4029 | } else { |
4030 | return 0; | |
4031 | } | |
4032 | } | |
4033 | ||
a55eb92c JK |
4034 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
4035 | int nr_sectors) | |
7cd1e32a | 4036 | { |
4037 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
4038 | } | |
aaa0eb75 LS |
4039 | |
4040 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
4041 | { | |
4042 | return bs->dirty_count; | |
4043 | } | |
f88e1a42 | 4044 | |
db593f25 MT |
4045 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4046 | { | |
4047 | assert(bs->in_use != in_use); | |
4048 | bs->in_use = in_use; | |
4049 | } | |
4050 | ||
4051 | int bdrv_in_use(BlockDriverState *bs) | |
4052 | { | |
4053 | return bs->in_use; | |
4054 | } | |
4055 | ||
28a7282a LC |
4056 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4057 | { | |
d6bf279e | 4058 | bs->iostatus_enabled = true; |
58e21ef5 | 4059 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4060 | } |
4061 | ||
4062 | /* The I/O status is only enabled if the drive explicitly | |
4063 | * enables it _and_ the VM is configured to stop on errors */ | |
4064 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4065 | { | |
d6bf279e | 4066 | return (bs->iostatus_enabled && |
28a7282a LC |
4067 | (bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || |
4068 | bs->on_write_error == BLOCK_ERR_STOP_ANY || | |
4069 | bs->on_read_error == BLOCK_ERR_STOP_ANY)); | |
4070 | } | |
4071 | ||
4072 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4073 | { | |
d6bf279e | 4074 | bs->iostatus_enabled = false; |
28a7282a LC |
4075 | } |
4076 | ||
4077 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4078 | { | |
4079 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4080 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4081 | } |
4082 | } | |
4083 | ||
4084 | /* XXX: Today this is set by device models because it makes the implementation | |
4085 | quite simple. However, the block layer knows about the error, so it's | |
4086 | possible to implement this without device models being involved */ | |
4087 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) | |
4088 | { | |
58e21ef5 LC |
4089 | if (bdrv_iostatus_is_enabled(bs) && |
4090 | bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
28a7282a | 4091 | assert(error >= 0); |
58e21ef5 LC |
4092 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4093 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4094 | } |
4095 | } | |
4096 | ||
a597e79c CH |
4097 | void |
4098 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4099 | enum BlockAcctType type) | |
4100 | { | |
4101 | assert(type < BDRV_MAX_IOTYPE); | |
4102 | ||
4103 | cookie->bytes = bytes; | |
c488c7f6 | 4104 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4105 | cookie->type = type; |
4106 | } | |
4107 | ||
4108 | void | |
4109 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4110 | { | |
4111 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4112 | ||
4113 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4114 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4115 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4116 | } |
4117 | ||
f88e1a42 JS |
4118 | int bdrv_img_create(const char *filename, const char *fmt, |
4119 | const char *base_filename, const char *base_fmt, | |
4120 | char *options, uint64_t img_size, int flags) | |
4121 | { | |
4122 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4123 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4124 | BlockDriverState *bs = NULL; |
4125 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4126 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4127 | int ret = 0; |
4128 | ||
4129 | /* Find driver and parse its options */ | |
4130 | drv = bdrv_find_format(fmt); | |
4131 | if (!drv) { | |
4132 | error_report("Unknown file format '%s'", fmt); | |
4f70f249 | 4133 | ret = -EINVAL; |
f88e1a42 JS |
4134 | goto out; |
4135 | } | |
4136 | ||
4137 | proto_drv = bdrv_find_protocol(filename); | |
4138 | if (!proto_drv) { | |
4139 | error_report("Unknown protocol '%s'", filename); | |
4f70f249 | 4140 | ret = -EINVAL; |
f88e1a42 JS |
4141 | goto out; |
4142 | } | |
4143 | ||
4144 | create_options = append_option_parameters(create_options, | |
4145 | drv->create_options); | |
4146 | create_options = append_option_parameters(create_options, | |
4147 | proto_drv->create_options); | |
4148 | ||
4149 | /* Create parameter list with default values */ | |
4150 | param = parse_option_parameters("", create_options, param); | |
4151 | ||
4152 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4153 | ||
4154 | /* Parse -o options */ | |
4155 | if (options) { | |
4156 | param = parse_option_parameters(options, create_options, param); | |
4157 | if (param == NULL) { | |
4158 | error_report("Invalid options for file format '%s'.", fmt); | |
4f70f249 | 4159 | ret = -EINVAL; |
f88e1a42 JS |
4160 | goto out; |
4161 | } | |
4162 | } | |
4163 | ||
4164 | if (base_filename) { | |
4165 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4166 | base_filename)) { | |
4167 | error_report("Backing file not supported for file format '%s'", | |
4168 | fmt); | |
4f70f249 | 4169 | ret = -EINVAL; |
f88e1a42 JS |
4170 | goto out; |
4171 | } | |
4172 | } | |
4173 | ||
4174 | if (base_fmt) { | |
4175 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
4176 | error_report("Backing file format not supported for file " | |
4177 | "format '%s'", fmt); | |
4f70f249 | 4178 | ret = -EINVAL; |
f88e1a42 JS |
4179 | goto out; |
4180 | } | |
4181 | } | |
4182 | ||
792da93a JS |
4183 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4184 | if (backing_file && backing_file->value.s) { | |
4185 | if (!strcmp(filename, backing_file->value.s)) { | |
4186 | error_report("Error: Trying to create an image with the " | |
4187 | "same filename as the backing file"); | |
4f70f249 | 4188 | ret = -EINVAL; |
792da93a JS |
4189 | goto out; |
4190 | } | |
4191 | } | |
4192 | ||
f88e1a42 JS |
4193 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4194 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4195 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4196 | if (!backing_drv) { | |
f88e1a42 JS |
4197 | error_report("Unknown backing file format '%s'", |
4198 | backing_fmt->value.s); | |
4f70f249 | 4199 | ret = -EINVAL; |
f88e1a42 JS |
4200 | goto out; |
4201 | } | |
4202 | } | |
4203 | ||
4204 | // The size for the image must always be specified, with one exception: | |
4205 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4206 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4207 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4208 | if (backing_file && backing_file->value.s) { |
4209 | uint64_t size; | |
f88e1a42 | 4210 | char buf[32]; |
63090dac PB |
4211 | int back_flags; |
4212 | ||
4213 | /* backing files always opened read-only */ | |
4214 | back_flags = | |
4215 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4216 | |
f88e1a42 JS |
4217 | bs = bdrv_new(""); |
4218 | ||
63090dac | 4219 | ret = bdrv_open(bs, backing_file->value.s, back_flags, backing_drv); |
f88e1a42 | 4220 | if (ret < 0) { |
96df67d1 | 4221 | error_report("Could not open '%s'", backing_file->value.s); |
f88e1a42 JS |
4222 | goto out; |
4223 | } | |
4224 | bdrv_get_geometry(bs, &size); | |
4225 | size *= 512; | |
4226 | ||
4227 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4228 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4229 | } else { | |
4230 | error_report("Image creation needs a size parameter"); | |
4f70f249 | 4231 | ret = -EINVAL; |
f88e1a42 JS |
4232 | goto out; |
4233 | } | |
4234 | } | |
4235 | ||
4236 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4237 | print_option_parameters(param); | |
4238 | puts(""); | |
4239 | ||
4240 | ret = bdrv_create(drv, filename, param); | |
4241 | ||
4242 | if (ret < 0) { | |
4243 | if (ret == -ENOTSUP) { | |
4244 | error_report("Formatting or formatting option not supported for " | |
4245 | "file format '%s'", fmt); | |
4246 | } else if (ret == -EFBIG) { | |
4247 | error_report("The image size is too large for file format '%s'", | |
4248 | fmt); | |
4249 | } else { | |
4250 | error_report("%s: error while creating %s: %s", filename, fmt, | |
4251 | strerror(-ret)); | |
4252 | } | |
4253 | } | |
4254 | ||
4255 | out: | |
4256 | free_option_parameters(create_options); | |
4257 | free_option_parameters(param); | |
4258 | ||
4259 | if (bs) { | |
4260 | bdrv_delete(bs); | |
4261 | } | |
4f70f249 JS |
4262 | |
4263 | return ret; | |
f88e1a42 | 4264 | } |
eeec61f2 SH |
4265 | |
4266 | void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, | |
c83c66c3 SH |
4267 | int64_t speed, BlockDriverCompletionFunc *cb, |
4268 | void *opaque, Error **errp) | |
eeec61f2 SH |
4269 | { |
4270 | BlockJob *job; | |
4271 | ||
4272 | if (bs->job || bdrv_in_use(bs)) { | |
fd7f8c65 | 4273 | error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); |
eeec61f2 SH |
4274 | return NULL; |
4275 | } | |
4276 | bdrv_set_in_use(bs, 1); | |
4277 | ||
4278 | job = g_malloc0(job_type->instance_size); | |
4279 | job->job_type = job_type; | |
4280 | job->bs = bs; | |
4281 | job->cb = cb; | |
4282 | job->opaque = opaque; | |
4513eafe | 4283 | job->busy = true; |
eeec61f2 | 4284 | bs->job = job; |
c83c66c3 SH |
4285 | |
4286 | /* Only set speed when necessary to avoid NotSupported error */ | |
4287 | if (speed != 0) { | |
4288 | Error *local_err = NULL; | |
4289 | ||
4290 | block_job_set_speed(job, speed, &local_err); | |
4291 | if (error_is_set(&local_err)) { | |
4292 | bs->job = NULL; | |
4293 | g_free(job); | |
4294 | bdrv_set_in_use(bs, 0); | |
4295 | error_propagate(errp, local_err); | |
4296 | return NULL; | |
4297 | } | |
4298 | } | |
eeec61f2 SH |
4299 | return job; |
4300 | } | |
4301 | ||
4302 | void block_job_complete(BlockJob *job, int ret) | |
4303 | { | |
4304 | BlockDriverState *bs = job->bs; | |
4305 | ||
4306 | assert(bs->job == job); | |
4307 | job->cb(job->opaque, ret); | |
4308 | bs->job = NULL; | |
4309 | g_free(job); | |
4310 | bdrv_set_in_use(bs, 0); | |
4311 | } | |
4312 | ||
882ec7ce | 4313 | void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp) |
eeec61f2 | 4314 | { |
9e6636c7 | 4315 | Error *local_err = NULL; |
9f25eccc | 4316 | |
eeec61f2 | 4317 | if (!job->job_type->set_speed) { |
9e6636c7 SH |
4318 | error_set(errp, QERR_NOT_SUPPORTED); |
4319 | return; | |
eeec61f2 | 4320 | } |
882ec7ce | 4321 | job->job_type->set_speed(job, speed, &local_err); |
9e6636c7 SH |
4322 | if (error_is_set(&local_err)) { |
4323 | error_propagate(errp, local_err); | |
4324 | return; | |
9f25eccc | 4325 | } |
9e6636c7 | 4326 | |
882ec7ce | 4327 | job->speed = speed; |
eeec61f2 SH |
4328 | } |
4329 | ||
4330 | void block_job_cancel(BlockJob *job) | |
4331 | { | |
4332 | job->cancelled = true; | |
fa4478d5 PB |
4333 | if (job->co && !job->busy) { |
4334 | qemu_coroutine_enter(job->co, NULL); | |
4335 | } | |
eeec61f2 SH |
4336 | } |
4337 | ||
4338 | bool block_job_is_cancelled(BlockJob *job) | |
4339 | { | |
4340 | return job->cancelled; | |
4341 | } | |
3e914655 | 4342 | |
fa4478d5 PB |
4343 | struct BlockCancelData { |
4344 | BlockJob *job; | |
4345 | BlockDriverCompletionFunc *cb; | |
4346 | void *opaque; | |
4347 | bool cancelled; | |
4348 | int ret; | |
4349 | }; | |
4350 | ||
4351 | static void block_job_cancel_cb(void *opaque, int ret) | |
3e914655 | 4352 | { |
fa4478d5 PB |
4353 | struct BlockCancelData *data = opaque; |
4354 | ||
4355 | data->cancelled = block_job_is_cancelled(data->job); | |
4356 | data->ret = ret; | |
4357 | data->cb(data->opaque, ret); | |
4358 | } | |
4359 | ||
4360 | int block_job_cancel_sync(BlockJob *job) | |
4361 | { | |
4362 | struct BlockCancelData data; | |
3e914655 PB |
4363 | BlockDriverState *bs = job->bs; |
4364 | ||
4365 | assert(bs->job == job); | |
fa4478d5 PB |
4366 | |
4367 | /* Set up our own callback to store the result and chain to | |
4368 | * the original callback. | |
4369 | */ | |
4370 | data.job = job; | |
4371 | data.cb = job->cb; | |
4372 | data.opaque = job->opaque; | |
4373 | data.ret = -EINPROGRESS; | |
4374 | job->cb = block_job_cancel_cb; | |
4375 | job->opaque = &data; | |
3e914655 | 4376 | block_job_cancel(job); |
fa4478d5 | 4377 | while (data.ret == -EINPROGRESS) { |
3e914655 PB |
4378 | qemu_aio_wait(); |
4379 | } | |
fa4478d5 | 4380 | return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret; |
3e914655 | 4381 | } |
4513eafe PB |
4382 | |
4383 | void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns) | |
4384 | { | |
4385 | /* Check cancellation *before* setting busy = false, too! */ | |
4386 | if (!block_job_is_cancelled(job)) { | |
4387 | job->busy = false; | |
4388 | co_sleep_ns(clock, ns); | |
4389 | job->busy = true; | |
4390 | } | |
4391 | } |