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Commit | Line | Data |
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26f54e9a MA |
1 | /* |
2 | * QEMU Block backends | |
3 | * | |
4 | * Copyright (C) 2014 Red Hat, Inc. | |
5 | * | |
6 | * Authors: | |
7 | * Markus Armbruster <armbru@redhat.com>, | |
8 | * | |
9 | * This work is licensed under the terms of the GNU LGPL, version 2.1 | |
10 | * or later. See the COPYING.LIB file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #include "sysemu/block-backend.h" | |
14 | #include "block/block_int.h" | |
373340b2 | 15 | #include "block/blockjob.h" |
281d22d8 | 16 | #include "block/throttle-groups.h" |
18e46a03 | 17 | #include "sysemu/blockdev.h" |
373340b2 | 18 | #include "sysemu/sysemu.h" |
a7f53e26 MA |
19 | #include "qapi-event.h" |
20 | ||
21 | /* Number of coroutines to reserve per attached device model */ | |
22 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 23 | |
4981bdec HR |
24 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
25 | ||
26f54e9a MA |
26 | struct BlockBackend { |
27 | char *name; | |
28 | int refcnt; | |
7e7d56d9 | 29 | BlockDriverState *bs; |
26f8b3a8 | 30 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
26f54e9a | 31 | QTAILQ_ENTRY(BlockBackend) link; /* for blk_backends */ |
a7f53e26 MA |
32 | |
33 | void *dev; /* attached device model, if any */ | |
34 | /* TODO change to DeviceState when all users are qdevified */ | |
35 | const BlockDevOps *dev_ops; | |
36 | void *dev_opaque; | |
68e9ec01 HR |
37 | |
38 | /* the block size for which the guest device expects atomicity */ | |
39 | int guest_block_size; | |
7f0e9da6 | 40 | |
281d22d8 HR |
41 | /* If the BDS tree is removed, some of its options are stored here (which |
42 | * can be used to restore those options in the new BDS on insert) */ | |
43 | BlockBackendRootState root_state; | |
44 | ||
7f0e9da6 HR |
45 | /* I/O stats (display with "info blockstats"). */ |
46 | BlockAcctStats stats; | |
373340b2 HR |
47 | |
48 | BlockdevOnError on_read_error, on_write_error; | |
49 | bool iostatus_enabled; | |
50 | BlockDeviceIoStatus iostatus; | |
26f54e9a MA |
51 | }; |
52 | ||
e7f7d676 HR |
53 | typedef struct BlockBackendAIOCB { |
54 | BlockAIOCB common; | |
55 | QEMUBH *bh; | |
4981bdec | 56 | BlockBackend *blk; |
e7f7d676 HR |
57 | int ret; |
58 | } BlockBackendAIOCB; | |
59 | ||
60 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 61 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
62 | .aiocb_size = sizeof(BlockBackendAIOCB), |
63 | }; | |
64 | ||
8fb3c76c MA |
65 | static void drive_info_del(DriveInfo *dinfo); |
66 | ||
7e7d56d9 | 67 | /* All the BlockBackends (except for hidden ones) */ |
26f54e9a MA |
68 | static QTAILQ_HEAD(, BlockBackend) blk_backends = |
69 | QTAILQ_HEAD_INITIALIZER(blk_backends); | |
70 | ||
71 | /* | |
72 | * Create a new BlockBackend with @name, with a reference count of one. | |
73 | * @name must not be null or empty. | |
74 | * Fail if a BlockBackend with this name already exists. | |
75 | * Store an error through @errp on failure, unless it's null. | |
76 | * Return the new BlockBackend on success, null on failure. | |
77 | */ | |
78 | BlockBackend *blk_new(const char *name, Error **errp) | |
79 | { | |
80 | BlockBackend *blk; | |
81 | ||
82 | assert(name && name[0]); | |
7f06d47e MA |
83 | if (!id_wellformed(name)) { |
84 | error_setg(errp, "Invalid device name"); | |
85 | return NULL; | |
86 | } | |
26f54e9a MA |
87 | if (blk_by_name(name)) { |
88 | error_setg(errp, "Device with id '%s' already exists", name); | |
89 | return NULL; | |
90 | } | |
7f06d47e MA |
91 | if (bdrv_find_node(name)) { |
92 | error_setg(errp, | |
93 | "Device name '%s' conflicts with an existing node name", | |
94 | name); | |
95 | return NULL; | |
96 | } | |
26f54e9a MA |
97 | |
98 | blk = g_new0(BlockBackend, 1); | |
99 | blk->name = g_strdup(name); | |
100 | blk->refcnt = 1; | |
101 | QTAILQ_INSERT_TAIL(&blk_backends, blk, link); | |
102 | return blk; | |
103 | } | |
104 | ||
7e7d56d9 MA |
105 | /* |
106 | * Create a new BlockBackend with a new BlockDriverState attached. | |
7e7d56d9 MA |
107 | * Otherwise just like blk_new(), which see. |
108 | */ | |
109 | BlockBackend *blk_new_with_bs(const char *name, Error **errp) | |
110 | { | |
111 | BlockBackend *blk; | |
112 | BlockDriverState *bs; | |
113 | ||
114 | blk = blk_new(name, errp); | |
115 | if (!blk) { | |
116 | return NULL; | |
117 | } | |
118 | ||
7f06d47e | 119 | bs = bdrv_new_root(); |
7e7d56d9 MA |
120 | blk->bs = bs; |
121 | bs->blk = blk; | |
122 | return blk; | |
123 | } | |
124 | ||
ca49a4fd HR |
125 | /* |
126 | * Calls blk_new_with_bs() and then calls bdrv_open() on the BlockDriverState. | |
127 | * | |
128 | * Just as with bdrv_open(), after having called this function the reference to | |
129 | * @options belongs to the block layer (even on failure). | |
130 | * | |
131 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
132 | * BDS tree just by specifying the @options QDict (or @reference, | |
133 | * alternatively). At the time of adding this function, this is not possible, | |
134 | * though, so callers of this function have to be able to specify @filename and | |
135 | * @flags. | |
136 | */ | |
137 | BlockBackend *blk_new_open(const char *name, const char *filename, | |
138 | const char *reference, QDict *options, int flags, | |
139 | Error **errp) | |
140 | { | |
141 | BlockBackend *blk; | |
142 | int ret; | |
143 | ||
144 | blk = blk_new_with_bs(name, errp); | |
145 | if (!blk) { | |
146 | QDECREF(options); | |
147 | return NULL; | |
148 | } | |
149 | ||
6ebf9aa2 | 150 | ret = bdrv_open(&blk->bs, filename, reference, options, flags, errp); |
ca49a4fd HR |
151 | if (ret < 0) { |
152 | blk_unref(blk); | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | return blk; | |
157 | } | |
158 | ||
26f54e9a MA |
159 | static void blk_delete(BlockBackend *blk) |
160 | { | |
161 | assert(!blk->refcnt); | |
a7f53e26 | 162 | assert(!blk->dev); |
7e7d56d9 | 163 | if (blk->bs) { |
9ba10c95 | 164 | assert(blk->bs->blk == blk); |
7e7d56d9 | 165 | blk->bs->blk = NULL; |
9ba10c95 | 166 | bdrv_unref(blk->bs); |
7e7d56d9 MA |
167 | blk->bs = NULL; |
168 | } | |
281d22d8 HR |
169 | if (blk->root_state.throttle_state) { |
170 | g_free(blk->root_state.throttle_group); | |
171 | throttle_group_unref(blk->root_state.throttle_state); | |
172 | } | |
3e5a50d6 | 173 | /* Avoid double-remove after blk_hide_on_behalf_of_hmp_drive_del() */ |
7e7d56d9 MA |
174 | if (blk->name[0]) { |
175 | QTAILQ_REMOVE(&blk_backends, blk, link); | |
176 | } | |
26f54e9a | 177 | g_free(blk->name); |
18e46a03 | 178 | drive_info_del(blk->legacy_dinfo); |
26f54e9a MA |
179 | g_free(blk); |
180 | } | |
181 | ||
8fb3c76c MA |
182 | static void drive_info_del(DriveInfo *dinfo) |
183 | { | |
184 | if (!dinfo) { | |
185 | return; | |
186 | } | |
187 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
188 | g_free(dinfo->serial); |
189 | g_free(dinfo); | |
190 | } | |
191 | ||
26f54e9a MA |
192 | /* |
193 | * Increment @blk's reference count. | |
194 | * @blk must not be null. | |
195 | */ | |
196 | void blk_ref(BlockBackend *blk) | |
197 | { | |
198 | blk->refcnt++; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Decrement @blk's reference count. | |
203 | * If this drops it to zero, destroy @blk. | |
204 | * For convenience, do nothing if @blk is null. | |
205 | */ | |
206 | void blk_unref(BlockBackend *blk) | |
207 | { | |
208 | if (blk) { | |
209 | assert(blk->refcnt > 0); | |
210 | if (!--blk->refcnt) { | |
211 | blk_delete(blk); | |
212 | } | |
213 | } | |
214 | } | |
215 | ||
216 | /* | |
217 | * Return the BlockBackend after @blk. | |
218 | * If @blk is null, return the first one. | |
219 | * Else, return @blk's next sibling, which may be null. | |
220 | * | |
221 | * To iterate over all BlockBackends, do | |
222 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
223 | * ... | |
224 | * } | |
225 | */ | |
226 | BlockBackend *blk_next(BlockBackend *blk) | |
227 | { | |
228 | return blk ? QTAILQ_NEXT(blk, link) : QTAILQ_FIRST(&blk_backends); | |
229 | } | |
230 | ||
231 | /* | |
7e7d56d9 MA |
232 | * Return @blk's name, a non-null string. |
233 | * Wart: the name is empty iff @blk has been hidden with | |
3e5a50d6 | 234 | * blk_hide_on_behalf_of_hmp_drive_del(). |
26f54e9a MA |
235 | */ |
236 | const char *blk_name(BlockBackend *blk) | |
237 | { | |
238 | return blk->name; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Return the BlockBackend with name @name if it exists, else null. | |
243 | * @name must not be null. | |
244 | */ | |
245 | BlockBackend *blk_by_name(const char *name) | |
246 | { | |
247 | BlockBackend *blk; | |
248 | ||
249 | assert(name); | |
250 | QTAILQ_FOREACH(blk, &blk_backends, link) { | |
251 | if (!strcmp(name, blk->name)) { | |
252 | return blk; | |
253 | } | |
254 | } | |
255 | return NULL; | |
256 | } | |
7e7d56d9 MA |
257 | |
258 | /* | |
259 | * Return the BlockDriverState attached to @blk if any, else null. | |
260 | */ | |
261 | BlockDriverState *blk_bs(BlockBackend *blk) | |
262 | { | |
263 | return blk->bs; | |
264 | } | |
265 | ||
a2d61900 KW |
266 | /* |
267 | * Changes the BlockDriverState attached to @blk | |
268 | */ | |
269 | void blk_set_bs(BlockBackend *blk, BlockDriverState *bs) | |
270 | { | |
271 | bdrv_ref(bs); | |
272 | ||
273 | if (blk->bs) { | |
274 | blk->bs->blk = NULL; | |
275 | bdrv_unref(blk->bs); | |
276 | } | |
277 | assert(bs->blk == NULL); | |
278 | ||
279 | blk->bs = bs; | |
280 | bs->blk = blk; | |
281 | } | |
282 | ||
18e46a03 MA |
283 | /* |
284 | * Return @blk's DriveInfo if any, else null. | |
285 | */ | |
286 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
287 | { | |
288 | return blk->legacy_dinfo; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Set @blk's DriveInfo to @dinfo, and return it. | |
293 | * @blk must not have a DriveInfo set already. | |
294 | * No other BlockBackend may have the same DriveInfo set. | |
295 | */ | |
296 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
297 | { | |
298 | assert(!blk->legacy_dinfo); | |
299 | return blk->legacy_dinfo = dinfo; | |
300 | } | |
301 | ||
302 | /* | |
303 | * Return the BlockBackend with DriveInfo @dinfo. | |
304 | * It must exist. | |
305 | */ | |
306 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
307 | { | |
308 | BlockBackend *blk; | |
309 | ||
310 | QTAILQ_FOREACH(blk, &blk_backends, link) { | |
311 | if (blk->legacy_dinfo == dinfo) { | |
312 | return blk; | |
313 | } | |
314 | } | |
315 | abort(); | |
316 | } | |
317 | ||
7e7d56d9 MA |
318 | /* |
319 | * Hide @blk. | |
320 | * @blk must not have been hidden already. | |
321 | * Make attached BlockDriverState, if any, anonymous. | |
322 | * Once hidden, @blk is invisible to all functions that don't receive | |
323 | * it as argument. For example, blk_by_name() won't return it. | |
324 | * Strictly for use by do_drive_del(). | |
325 | * TODO get rid of it! | |
326 | */ | |
3e5a50d6 | 327 | void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk) |
7e7d56d9 MA |
328 | { |
329 | QTAILQ_REMOVE(&blk_backends, blk, link); | |
330 | blk->name[0] = 0; | |
331 | if (blk->bs) { | |
332 | bdrv_make_anon(blk->bs); | |
333 | } | |
334 | } | |
4be74634 | 335 | |
a7f53e26 MA |
336 | /* |
337 | * Attach device model @dev to @blk. | |
338 | * Return 0 on success, -EBUSY when a device model is attached already. | |
339 | */ | |
4be74634 | 340 | int blk_attach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 341 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 342 | { |
a7f53e26 MA |
343 | if (blk->dev) { |
344 | return -EBUSY; | |
345 | } | |
84ebe375 | 346 | blk_ref(blk); |
a7f53e26 | 347 | blk->dev = dev; |
373340b2 | 348 | blk_iostatus_reset(blk); |
a7f53e26 | 349 | return 0; |
4be74634 MA |
350 | } |
351 | ||
a7f53e26 MA |
352 | /* |
353 | * Attach device model @dev to @blk. | |
354 | * @blk must not have a device model attached already. | |
355 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
356 | */ | |
4be74634 MA |
357 | void blk_attach_dev_nofail(BlockBackend *blk, void *dev) |
358 | { | |
a7f53e26 MA |
359 | if (blk_attach_dev(blk, dev) < 0) { |
360 | abort(); | |
361 | } | |
4be74634 MA |
362 | } |
363 | ||
a7f53e26 MA |
364 | /* |
365 | * Detach device model @dev from @blk. | |
366 | * @dev must be currently attached to @blk. | |
367 | */ | |
4be74634 | 368 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 369 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 370 | { |
a7f53e26 MA |
371 | assert(blk->dev == dev); |
372 | blk->dev = NULL; | |
373 | blk->dev_ops = NULL; | |
374 | blk->dev_opaque = NULL; | |
68e9ec01 | 375 | blk->guest_block_size = 512; |
84ebe375 | 376 | blk_unref(blk); |
4be74634 MA |
377 | } |
378 | ||
a7f53e26 MA |
379 | /* |
380 | * Return the device model attached to @blk if any, else null. | |
381 | */ | |
4be74634 | 382 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
383 | /* TODO change to return DeviceState * when all users are qdevified */ |
384 | { | |
385 | return blk->dev; | |
386 | } | |
387 | ||
388 | /* | |
389 | * Set @blk's device model callbacks to @ops. | |
390 | * @opaque is the opaque argument to pass to the callbacks. | |
391 | * This is for use by device models. | |
392 | */ | |
393 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
394 | void *opaque) | |
395 | { | |
396 | blk->dev_ops = ops; | |
397 | blk->dev_opaque = opaque; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Notify @blk's attached device model of media change. | |
402 | * If @load is true, notify of media load. | |
403 | * Else, notify of media eject. | |
404 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
405 | */ | |
406 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
407 | { | |
408 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
409 | bool tray_was_closed = !blk_dev_is_tray_open(blk); | |
410 | ||
411 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); | |
412 | if (tray_was_closed) { | |
413 | /* tray open */ | |
414 | qapi_event_send_device_tray_moved(blk_name(blk), | |
415 | true, &error_abort); | |
416 | } | |
417 | if (load) { | |
418 | /* tray close */ | |
419 | qapi_event_send_device_tray_moved(blk_name(blk), | |
420 | false, &error_abort); | |
421 | } | |
422 | } | |
423 | } | |
424 | ||
425 | /* | |
426 | * Does @blk's attached device model have removable media? | |
427 | * %true if no device model is attached. | |
428 | */ | |
429 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
430 | { | |
431 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
432 | } | |
433 | ||
434 | /* | |
435 | * Notify @blk's attached device model of a media eject request. | |
436 | * If @force is true, the medium is about to be yanked out forcefully. | |
437 | */ | |
438 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 439 | { |
a7f53e26 MA |
440 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
441 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
442 | } | |
4be74634 MA |
443 | } |
444 | ||
a7f53e26 MA |
445 | /* |
446 | * Does @blk's attached device model have a tray, and is it open? | |
447 | */ | |
448 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 449 | { |
a7f53e26 MA |
450 | if (blk->dev_ops && blk->dev_ops->is_tray_open) { |
451 | return blk->dev_ops->is_tray_open(blk->dev_opaque); | |
452 | } | |
453 | return false; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Does @blk's attached device model have the medium locked? | |
458 | * %false if the device model has no such lock. | |
459 | */ | |
460 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
461 | { | |
462 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
463 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
464 | } | |
465 | return false; | |
466 | } | |
467 | ||
468 | /* | |
469 | * Notify @blk's attached device model of a backend size change. | |
470 | */ | |
471 | void blk_dev_resize_cb(BlockBackend *blk) | |
472 | { | |
473 | if (blk->dev_ops && blk->dev_ops->resize_cb) { | |
474 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
475 | } | |
476 | } | |
477 | ||
478 | void blk_iostatus_enable(BlockBackend *blk) | |
479 | { | |
373340b2 HR |
480 | blk->iostatus_enabled = true; |
481 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
482 | } | |
483 | ||
484 | /* The I/O status is only enabled if the drive explicitly | |
485 | * enables it _and_ the VM is configured to stop on errors */ | |
486 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
487 | { | |
488 | return (blk->iostatus_enabled && | |
489 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
490 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
491 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
492 | } | |
493 | ||
494 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
495 | { | |
496 | return blk->iostatus; | |
497 | } | |
498 | ||
499 | void blk_iostatus_disable(BlockBackend *blk) | |
500 | { | |
501 | blk->iostatus_enabled = false; | |
502 | } | |
503 | ||
504 | void blk_iostatus_reset(BlockBackend *blk) | |
505 | { | |
506 | if (blk_iostatus_is_enabled(blk)) { | |
507 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
508 | if (blk->bs && blk->bs->job) { | |
509 | block_job_iostatus_reset(blk->bs->job); | |
510 | } | |
511 | } | |
512 | } | |
513 | ||
514 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
515 | { | |
516 | assert(blk_iostatus_is_enabled(blk)); | |
517 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
518 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
519 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
520 | } | |
4be74634 MA |
521 | } |
522 | ||
e7f7d676 HR |
523 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
524 | size_t size) | |
525 | { | |
526 | int64_t len; | |
527 | ||
528 | if (size > INT_MAX) { | |
529 | return -EIO; | |
530 | } | |
531 | ||
c09ba36c | 532 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
533 | return -ENOMEDIUM; |
534 | } | |
535 | ||
536 | len = blk_getlength(blk); | |
537 | if (len < 0) { | |
538 | return len; | |
539 | } | |
540 | ||
541 | if (offset < 0) { | |
542 | return -EIO; | |
543 | } | |
544 | ||
545 | if (offset > len || len - offset < size) { | |
546 | return -EIO; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static int blk_check_request(BlockBackend *blk, int64_t sector_num, | |
553 | int nb_sectors) | |
554 | { | |
555 | if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) { | |
556 | return -EIO; | |
557 | } | |
558 | ||
559 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { | |
560 | return -EIO; | |
561 | } | |
562 | ||
563 | return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE, | |
564 | nb_sectors * BDRV_SECTOR_SIZE); | |
565 | } | |
566 | ||
4be74634 MA |
567 | int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf, |
568 | int nb_sectors) | |
569 | { | |
e7f7d676 HR |
570 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
571 | if (ret < 0) { | |
572 | return ret; | |
573 | } | |
574 | ||
4be74634 MA |
575 | return bdrv_read(blk->bs, sector_num, buf, nb_sectors); |
576 | } | |
577 | ||
578 | int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf, | |
579 | int nb_sectors) | |
580 | { | |
e7f7d676 HR |
581 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
582 | if (ret < 0) { | |
583 | return ret; | |
584 | } | |
585 | ||
4be74634 MA |
586 | return bdrv_read_unthrottled(blk->bs, sector_num, buf, nb_sectors); |
587 | } | |
588 | ||
589 | int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf, | |
590 | int nb_sectors) | |
591 | { | |
e7f7d676 HR |
592 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
593 | if (ret < 0) { | |
594 | return ret; | |
595 | } | |
596 | ||
4be74634 MA |
597 | return bdrv_write(blk->bs, sector_num, buf, nb_sectors); |
598 | } | |
599 | ||
0df89e8e KW |
600 | int blk_write_zeroes(BlockBackend *blk, int64_t sector_num, |
601 | int nb_sectors, BdrvRequestFlags flags) | |
602 | { | |
603 | int ret = blk_check_request(blk, sector_num, nb_sectors); | |
604 | if (ret < 0) { | |
605 | return ret; | |
606 | } | |
607 | ||
608 | return bdrv_write_zeroes(blk->bs, sector_num, nb_sectors, flags); | |
609 | } | |
610 | ||
e7f7d676 HR |
611 | static void error_callback_bh(void *opaque) |
612 | { | |
613 | struct BlockBackendAIOCB *acb = opaque; | |
614 | qemu_bh_delete(acb->bh); | |
615 | acb->common.cb(acb->common.opaque, acb->ret); | |
616 | qemu_aio_unref(acb); | |
617 | } | |
618 | ||
619 | static BlockAIOCB *abort_aio_request(BlockBackend *blk, BlockCompletionFunc *cb, | |
620 | void *opaque, int ret) | |
621 | { | |
622 | struct BlockBackendAIOCB *acb; | |
623 | QEMUBH *bh; | |
624 | ||
625 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); | |
4981bdec | 626 | acb->blk = blk; |
e7f7d676 HR |
627 | acb->ret = ret; |
628 | ||
629 | bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb); | |
630 | acb->bh = bh; | |
631 | qemu_bh_schedule(bh); | |
632 | ||
633 | return &acb->common; | |
634 | } | |
635 | ||
4be74634 MA |
636 | BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num, |
637 | int nb_sectors, BdrvRequestFlags flags, | |
638 | BlockCompletionFunc *cb, void *opaque) | |
639 | { | |
e7f7d676 HR |
640 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
641 | if (ret < 0) { | |
642 | return abort_aio_request(blk, cb, opaque, ret); | |
643 | } | |
644 | ||
4be74634 MA |
645 | return bdrv_aio_write_zeroes(blk->bs, sector_num, nb_sectors, flags, |
646 | cb, opaque); | |
647 | } | |
648 | ||
649 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
650 | { | |
e7f7d676 HR |
651 | int ret = blk_check_byte_request(blk, offset, count); |
652 | if (ret < 0) { | |
653 | return ret; | |
654 | } | |
655 | ||
4be74634 MA |
656 | return bdrv_pread(blk->bs, offset, buf, count); |
657 | } | |
658 | ||
659 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count) | |
660 | { | |
e7f7d676 HR |
661 | int ret = blk_check_byte_request(blk, offset, count); |
662 | if (ret < 0) { | |
663 | return ret; | |
664 | } | |
665 | ||
4be74634 MA |
666 | return bdrv_pwrite(blk->bs, offset, buf, count); |
667 | } | |
668 | ||
669 | int64_t blk_getlength(BlockBackend *blk) | |
670 | { | |
c09ba36c HR |
671 | if (!blk_is_available(blk)) { |
672 | return -ENOMEDIUM; | |
673 | } | |
674 | ||
4be74634 MA |
675 | return bdrv_getlength(blk->bs); |
676 | } | |
677 | ||
678 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
679 | { | |
680 | bdrv_get_geometry(blk->bs, nb_sectors_ptr); | |
681 | } | |
682 | ||
1ef01253 HR |
683 | int64_t blk_nb_sectors(BlockBackend *blk) |
684 | { | |
c09ba36c HR |
685 | if (!blk_is_available(blk)) { |
686 | return -ENOMEDIUM; | |
687 | } | |
688 | ||
1ef01253 HR |
689 | return bdrv_nb_sectors(blk->bs); |
690 | } | |
691 | ||
4be74634 MA |
692 | BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num, |
693 | QEMUIOVector *iov, int nb_sectors, | |
694 | BlockCompletionFunc *cb, void *opaque) | |
695 | { | |
e7f7d676 HR |
696 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
697 | if (ret < 0) { | |
698 | return abort_aio_request(blk, cb, opaque, ret); | |
699 | } | |
700 | ||
4be74634 MA |
701 | return bdrv_aio_readv(blk->bs, sector_num, iov, nb_sectors, cb, opaque); |
702 | } | |
703 | ||
704 | BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, | |
705 | QEMUIOVector *iov, int nb_sectors, | |
706 | BlockCompletionFunc *cb, void *opaque) | |
707 | { | |
e7f7d676 HR |
708 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
709 | if (ret < 0) { | |
710 | return abort_aio_request(blk, cb, opaque, ret); | |
711 | } | |
712 | ||
4be74634 MA |
713 | return bdrv_aio_writev(blk->bs, sector_num, iov, nb_sectors, cb, opaque); |
714 | } | |
715 | ||
716 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
717 | BlockCompletionFunc *cb, void *opaque) | |
718 | { | |
c09ba36c HR |
719 | if (!blk_is_available(blk)) { |
720 | return abort_aio_request(blk, cb, opaque, -ENOMEDIUM); | |
721 | } | |
722 | ||
4be74634 MA |
723 | return bdrv_aio_flush(blk->bs, cb, opaque); |
724 | } | |
725 | ||
726 | BlockAIOCB *blk_aio_discard(BlockBackend *blk, | |
727 | int64_t sector_num, int nb_sectors, | |
728 | BlockCompletionFunc *cb, void *opaque) | |
729 | { | |
e7f7d676 HR |
730 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
731 | if (ret < 0) { | |
732 | return abort_aio_request(blk, cb, opaque, ret); | |
733 | } | |
734 | ||
4be74634 MA |
735 | return bdrv_aio_discard(blk->bs, sector_num, nb_sectors, cb, opaque); |
736 | } | |
737 | ||
738 | void blk_aio_cancel(BlockAIOCB *acb) | |
739 | { | |
740 | bdrv_aio_cancel(acb); | |
741 | } | |
742 | ||
743 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
744 | { | |
745 | bdrv_aio_cancel_async(acb); | |
746 | } | |
747 | ||
748 | int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs) | |
749 | { | |
e7f7d676 HR |
750 | int i, ret; |
751 | ||
752 | for (i = 0; i < num_reqs; i++) { | |
753 | ret = blk_check_request(blk, reqs[i].sector, reqs[i].nb_sectors); | |
754 | if (ret < 0) { | |
755 | return ret; | |
756 | } | |
757 | } | |
758 | ||
4be74634 MA |
759 | return bdrv_aio_multiwrite(blk->bs, reqs, num_reqs); |
760 | } | |
761 | ||
762 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
763 | { | |
c09ba36c HR |
764 | if (!blk_is_available(blk)) { |
765 | return -ENOMEDIUM; | |
766 | } | |
767 | ||
4be74634 MA |
768 | return bdrv_ioctl(blk->bs, req, buf); |
769 | } | |
770 | ||
771 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
772 | BlockCompletionFunc *cb, void *opaque) | |
773 | { | |
c09ba36c HR |
774 | if (!blk_is_available(blk)) { |
775 | return abort_aio_request(blk, cb, opaque, -ENOMEDIUM); | |
776 | } | |
777 | ||
4be74634 MA |
778 | return bdrv_aio_ioctl(blk->bs, req, buf, cb, opaque); |
779 | } | |
780 | ||
2bb0dce7 HR |
781 | int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) |
782 | { | |
e7f7d676 HR |
783 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
784 | if (ret < 0) { | |
785 | return ret; | |
786 | } | |
787 | ||
2bb0dce7 HR |
788 | return bdrv_co_discard(blk->bs, sector_num, nb_sectors); |
789 | } | |
790 | ||
791 | int blk_co_flush(BlockBackend *blk) | |
792 | { | |
c09ba36c HR |
793 | if (!blk_is_available(blk)) { |
794 | return -ENOMEDIUM; | |
795 | } | |
796 | ||
2bb0dce7 HR |
797 | return bdrv_co_flush(blk->bs); |
798 | } | |
799 | ||
4be74634 MA |
800 | int blk_flush(BlockBackend *blk) |
801 | { | |
c09ba36c HR |
802 | if (!blk_is_available(blk)) { |
803 | return -ENOMEDIUM; | |
804 | } | |
805 | ||
4be74634 MA |
806 | return bdrv_flush(blk->bs); |
807 | } | |
808 | ||
809 | int blk_flush_all(void) | |
810 | { | |
811 | return bdrv_flush_all(); | |
812 | } | |
813 | ||
97b0385a AY |
814 | void blk_drain(BlockBackend *blk) |
815 | { | |
816 | bdrv_drain(blk->bs); | |
817 | } | |
818 | ||
4be74634 MA |
819 | void blk_drain_all(void) |
820 | { | |
821 | bdrv_drain_all(); | |
822 | } | |
823 | ||
373340b2 HR |
824 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
825 | BlockdevOnError on_write_error) | |
826 | { | |
827 | blk->on_read_error = on_read_error; | |
828 | blk->on_write_error = on_write_error; | |
829 | } | |
830 | ||
4be74634 MA |
831 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
832 | { | |
373340b2 | 833 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
834 | } |
835 | ||
836 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
837 | int error) | |
838 | { | |
373340b2 HR |
839 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
840 | ||
841 | switch (on_err) { | |
842 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
843 | return (error == ENOSPC) ? | |
844 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
845 | case BLOCKDEV_ON_ERROR_STOP: | |
846 | return BLOCK_ERROR_ACTION_STOP; | |
847 | case BLOCKDEV_ON_ERROR_REPORT: | |
848 | return BLOCK_ERROR_ACTION_REPORT; | |
849 | case BLOCKDEV_ON_ERROR_IGNORE: | |
850 | return BLOCK_ERROR_ACTION_IGNORE; | |
851 | default: | |
852 | abort(); | |
853 | } | |
4be74634 MA |
854 | } |
855 | ||
373340b2 HR |
856 | static void send_qmp_error_event(BlockBackend *blk, |
857 | BlockErrorAction action, | |
858 | bool is_read, int error) | |
859 | { | |
860 | IoOperationType optype; | |
861 | ||
862 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
863 | qapi_event_send_block_io_error(blk_name(blk), optype, action, | |
864 | blk_iostatus_is_enabled(blk), | |
865 | error == ENOSPC, strerror(error), | |
866 | &error_abort); | |
867 | } | |
868 | ||
869 | /* This is done by device models because, while the block layer knows | |
870 | * about the error, it does not know whether an operation comes from | |
871 | * the device or the block layer (from a job, for example). | |
872 | */ | |
4be74634 MA |
873 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
874 | bool is_read, int error) | |
875 | { | |
373340b2 HR |
876 | assert(error >= 0); |
877 | ||
878 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
879 | /* First set the iostatus, so that "info block" returns an iostatus | |
880 | * that matches the events raised so far (an additional error iostatus | |
881 | * is fine, but not a lost one). | |
882 | */ | |
883 | blk_iostatus_set_err(blk, error); | |
884 | ||
885 | /* Then raise the request to stop the VM and the event. | |
886 | * qemu_system_vmstop_request_prepare has two effects. First, | |
887 | * it ensures that the STOP event always comes after the | |
888 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
889 | * can observe the STOP event and do a "cont" before the STOP | |
890 | * event is issued, the VM will not stop. In this case, vm_start() | |
891 | * also ensures that the STOP/RESUME pair of events is emitted. | |
892 | */ | |
893 | qemu_system_vmstop_request_prepare(); | |
894 | send_qmp_error_event(blk, action, is_read, error); | |
895 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
896 | } else { | |
897 | send_qmp_error_event(blk, action, is_read, error); | |
898 | } | |
4be74634 MA |
899 | } |
900 | ||
901 | int blk_is_read_only(BlockBackend *blk) | |
902 | { | |
061959e8 HR |
903 | if (blk->bs) { |
904 | return bdrv_is_read_only(blk->bs); | |
905 | } else { | |
906 | return blk->root_state.read_only; | |
907 | } | |
4be74634 MA |
908 | } |
909 | ||
910 | int blk_is_sg(BlockBackend *blk) | |
911 | { | |
912 | return bdrv_is_sg(blk->bs); | |
913 | } | |
914 | ||
915 | int blk_enable_write_cache(BlockBackend *blk) | |
916 | { | |
061959e8 HR |
917 | if (blk->bs) { |
918 | return bdrv_enable_write_cache(blk->bs); | |
919 | } else { | |
920 | return !!(blk->root_state.open_flags & BDRV_O_CACHE_WB); | |
921 | } | |
4be74634 MA |
922 | } |
923 | ||
924 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
925 | { | |
061959e8 HR |
926 | if (blk->bs) { |
927 | bdrv_set_enable_write_cache(blk->bs, wce); | |
928 | } else { | |
929 | if (wce) { | |
930 | blk->root_state.open_flags |= BDRV_O_CACHE_WB; | |
931 | } else { | |
932 | blk->root_state.open_flags &= ~BDRV_O_CACHE_WB; | |
933 | } | |
934 | } | |
4be74634 MA |
935 | } |
936 | ||
2bb0dce7 HR |
937 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
938 | { | |
c09ba36c HR |
939 | if (!blk->bs) { |
940 | error_setg(errp, "Device '%s' has no medium", blk->name); | |
941 | return; | |
942 | } | |
943 | ||
2bb0dce7 HR |
944 | bdrv_invalidate_cache(blk->bs, errp); |
945 | } | |
946 | ||
e031f750 | 947 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 948 | { |
db0284f8 HR |
949 | return blk->bs && bdrv_is_inserted(blk->bs); |
950 | } | |
951 | ||
952 | bool blk_is_available(BlockBackend *blk) | |
953 | { | |
954 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
955 | } |
956 | ||
957 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
958 | { | |
959 | bdrv_lock_medium(blk->bs, locked); | |
960 | } | |
961 | ||
962 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
963 | { | |
964 | bdrv_eject(blk->bs, eject_flag); | |
965 | } | |
966 | ||
967 | int blk_get_flags(BlockBackend *blk) | |
968 | { | |
061959e8 HR |
969 | if (blk->bs) { |
970 | return bdrv_get_flags(blk->bs); | |
971 | } else { | |
972 | return blk->root_state.open_flags; | |
973 | } | |
4be74634 MA |
974 | } |
975 | ||
454057b7 PL |
976 | int blk_get_max_transfer_length(BlockBackend *blk) |
977 | { | |
978 | return blk->bs->bl.max_transfer_length; | |
979 | } | |
980 | ||
4be74634 MA |
981 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
982 | { | |
68e9ec01 | 983 | blk->guest_block_size = align; |
4be74634 MA |
984 | } |
985 | ||
986 | void *blk_blockalign(BlockBackend *blk, size_t size) | |
987 | { | |
988 | return qemu_blockalign(blk ? blk->bs : NULL, size); | |
989 | } | |
990 | ||
991 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
992 | { | |
993 | return bdrv_op_is_blocked(blk->bs, op, errp); | |
994 | } | |
995 | ||
996 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
997 | { | |
998 | bdrv_op_unblock(blk->bs, op, reason); | |
999 | } | |
1000 | ||
1001 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1002 | { | |
1003 | bdrv_op_block_all(blk->bs, reason); | |
1004 | } | |
1005 | ||
1006 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1007 | { | |
1008 | bdrv_op_unblock_all(blk->bs, reason); | |
1009 | } | |
1010 | ||
1011 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1012 | { | |
4981bdec HR |
1013 | if (blk->bs) { |
1014 | return bdrv_get_aio_context(blk->bs); | |
1015 | } else { | |
1016 | return qemu_get_aio_context(); | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1021 | { | |
1022 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1023 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1024 | } |
1025 | ||
1026 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1027 | { | |
1028 | bdrv_set_aio_context(blk->bs, new_context); | |
1029 | } | |
1030 | ||
2019ba0a HR |
1031 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1032 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1033 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1034 | { | |
1035 | bdrv_add_aio_context_notifier(blk->bs, attached_aio_context, | |
1036 | detach_aio_context, opaque); | |
1037 | } | |
1038 | ||
1039 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1040 | void (*attached_aio_context)(AioContext *, | |
1041 | void *), | |
1042 | void (*detach_aio_context)(void *), | |
1043 | void *opaque) | |
1044 | { | |
1045 | bdrv_remove_aio_context_notifier(blk->bs, attached_aio_context, | |
1046 | detach_aio_context, opaque); | |
1047 | } | |
1048 | ||
2c28b21f HR |
1049 | void blk_add_close_notifier(BlockBackend *blk, Notifier *notify) |
1050 | { | |
1051 | bdrv_add_close_notifier(blk->bs, notify); | |
1052 | } | |
1053 | ||
4be74634 MA |
1054 | void blk_io_plug(BlockBackend *blk) |
1055 | { | |
1056 | bdrv_io_plug(blk->bs); | |
1057 | } | |
1058 | ||
1059 | void blk_io_unplug(BlockBackend *blk) | |
1060 | { | |
1061 | bdrv_io_unplug(blk->bs); | |
1062 | } | |
1063 | ||
1064 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1065 | { | |
7f0e9da6 | 1066 | return &blk->stats; |
4be74634 MA |
1067 | } |
1068 | ||
1069 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1070 | BlockCompletionFunc *cb, void *opaque) | |
1071 | { | |
1072 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1073 | } | |
1ef01253 HR |
1074 | |
1075 | int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num, | |
1076 | int nb_sectors, BdrvRequestFlags flags) | |
1077 | { | |
e7f7d676 HR |
1078 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1079 | if (ret < 0) { | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1ef01253 HR |
1083 | return bdrv_co_write_zeroes(blk->bs, sector_num, nb_sectors, flags); |
1084 | } | |
1085 | ||
1086 | int blk_write_compressed(BlockBackend *blk, int64_t sector_num, | |
1087 | const uint8_t *buf, int nb_sectors) | |
1088 | { | |
e7f7d676 HR |
1089 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1090 | if (ret < 0) { | |
1091 | return ret; | |
1092 | } | |
1093 | ||
1ef01253 HR |
1094 | return bdrv_write_compressed(blk->bs, sector_num, buf, nb_sectors); |
1095 | } | |
1096 | ||
1097 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1098 | { | |
c09ba36c HR |
1099 | if (!blk_is_available(blk)) { |
1100 | return -ENOMEDIUM; | |
1101 | } | |
1102 | ||
1ef01253 HR |
1103 | return bdrv_truncate(blk->bs, offset); |
1104 | } | |
1105 | ||
1106 | int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) | |
1107 | { | |
e7f7d676 HR |
1108 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1109 | if (ret < 0) { | |
1110 | return ret; | |
1111 | } | |
1112 | ||
1ef01253 HR |
1113 | return bdrv_discard(blk->bs, sector_num, nb_sectors); |
1114 | } | |
1115 | ||
1116 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1117 | int64_t pos, int size) | |
1118 | { | |
c09ba36c HR |
1119 | if (!blk_is_available(blk)) { |
1120 | return -ENOMEDIUM; | |
1121 | } | |
1122 | ||
1ef01253 HR |
1123 | return bdrv_save_vmstate(blk->bs, buf, pos, size); |
1124 | } | |
1125 | ||
1126 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1127 | { | |
c09ba36c HR |
1128 | if (!blk_is_available(blk)) { |
1129 | return -ENOMEDIUM; | |
1130 | } | |
1131 | ||
1ef01253 HR |
1132 | return bdrv_load_vmstate(blk->bs, buf, pos, size); |
1133 | } | |
f0272c4d ET |
1134 | |
1135 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1136 | { | |
c09ba36c HR |
1137 | if (!blk_is_available(blk)) { |
1138 | return -ENOMEDIUM; | |
1139 | } | |
1140 | ||
f0272c4d ET |
1141 | return bdrv_probe_blocksizes(blk->bs, bsz); |
1142 | } | |
1143 | ||
1144 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1145 | { | |
c09ba36c HR |
1146 | if (!blk_is_available(blk)) { |
1147 | return -ENOMEDIUM; | |
1148 | } | |
1149 | ||
f0272c4d ET |
1150 | return bdrv_probe_geometry(blk->bs, geo); |
1151 | } | |
281d22d8 HR |
1152 | |
1153 | /* | |
1154 | * Updates the BlockBackendRootState object with data from the currently | |
1155 | * attached BlockDriverState. | |
1156 | */ | |
1157 | void blk_update_root_state(BlockBackend *blk) | |
1158 | { | |
1159 | assert(blk->bs); | |
1160 | ||
1161 | blk->root_state.open_flags = blk->bs->open_flags; | |
1162 | blk->root_state.read_only = blk->bs->read_only; | |
1163 | blk->root_state.detect_zeroes = blk->bs->detect_zeroes; | |
1164 | ||
1165 | if (blk->root_state.throttle_group) { | |
1166 | g_free(blk->root_state.throttle_group); | |
1167 | throttle_group_unref(blk->root_state.throttle_state); | |
1168 | } | |
1169 | if (blk->bs->throttle_state) { | |
1170 | const char *name = throttle_group_get_name(blk->bs); | |
1171 | blk->root_state.throttle_group = g_strdup(name); | |
1172 | blk->root_state.throttle_state = throttle_group_incref(name); | |
1173 | } else { | |
1174 | blk->root_state.throttle_group = NULL; | |
1175 | blk->root_state.throttle_state = NULL; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) | |
1180 | { | |
1181 | return &blk->root_state; | |
1182 | } |