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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 | |
0c3c36d6 HR |
336 | /* |
337 | * Associates a new BlockDriverState with @blk. | |
338 | */ | |
339 | void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) | |
340 | { | |
341 | assert(!blk->bs && !bs->blk); | |
342 | bdrv_ref(bs); | |
343 | blk->bs = bs; | |
344 | bs->blk = blk; | |
345 | } | |
346 | ||
a7f53e26 MA |
347 | /* |
348 | * Attach device model @dev to @blk. | |
349 | * Return 0 on success, -EBUSY when a device model is attached already. | |
350 | */ | |
4be74634 | 351 | int blk_attach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 352 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 353 | { |
a7f53e26 MA |
354 | if (blk->dev) { |
355 | return -EBUSY; | |
356 | } | |
84ebe375 | 357 | blk_ref(blk); |
a7f53e26 | 358 | blk->dev = dev; |
373340b2 | 359 | blk_iostatus_reset(blk); |
a7f53e26 | 360 | return 0; |
4be74634 MA |
361 | } |
362 | ||
a7f53e26 MA |
363 | /* |
364 | * Attach device model @dev to @blk. | |
365 | * @blk must not have a device model attached already. | |
366 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
367 | */ | |
4be74634 MA |
368 | void blk_attach_dev_nofail(BlockBackend *blk, void *dev) |
369 | { | |
a7f53e26 MA |
370 | if (blk_attach_dev(blk, dev) < 0) { |
371 | abort(); | |
372 | } | |
4be74634 MA |
373 | } |
374 | ||
a7f53e26 MA |
375 | /* |
376 | * Detach device model @dev from @blk. | |
377 | * @dev must be currently attached to @blk. | |
378 | */ | |
4be74634 | 379 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 380 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 381 | { |
a7f53e26 MA |
382 | assert(blk->dev == dev); |
383 | blk->dev = NULL; | |
384 | blk->dev_ops = NULL; | |
385 | blk->dev_opaque = NULL; | |
68e9ec01 | 386 | blk->guest_block_size = 512; |
84ebe375 | 387 | blk_unref(blk); |
4be74634 MA |
388 | } |
389 | ||
a7f53e26 MA |
390 | /* |
391 | * Return the device model attached to @blk if any, else null. | |
392 | */ | |
4be74634 | 393 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
394 | /* TODO change to return DeviceState * when all users are qdevified */ |
395 | { | |
396 | return blk->dev; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Set @blk's device model callbacks to @ops. | |
401 | * @opaque is the opaque argument to pass to the callbacks. | |
402 | * This is for use by device models. | |
403 | */ | |
404 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
405 | void *opaque) | |
406 | { | |
407 | blk->dev_ops = ops; | |
408 | blk->dev_opaque = opaque; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Notify @blk's attached device model of media change. | |
413 | * If @load is true, notify of media load. | |
414 | * Else, notify of media eject. | |
415 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
416 | */ | |
417 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
418 | { | |
419 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
420 | bool tray_was_closed = !blk_dev_is_tray_open(blk); | |
421 | ||
422 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); | |
423 | if (tray_was_closed) { | |
424 | /* tray open */ | |
425 | qapi_event_send_device_tray_moved(blk_name(blk), | |
426 | true, &error_abort); | |
427 | } | |
428 | if (load) { | |
429 | /* tray close */ | |
430 | qapi_event_send_device_tray_moved(blk_name(blk), | |
431 | false, &error_abort); | |
432 | } | |
433 | } | |
434 | } | |
435 | ||
436 | /* | |
437 | * Does @blk's attached device model have removable media? | |
438 | * %true if no device model is attached. | |
439 | */ | |
440 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
441 | { | |
442 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
443 | } | |
444 | ||
445 | /* | |
446 | * Notify @blk's attached device model of a media eject request. | |
447 | * If @force is true, the medium is about to be yanked out forcefully. | |
448 | */ | |
449 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 450 | { |
a7f53e26 MA |
451 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
452 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
453 | } | |
4be74634 MA |
454 | } |
455 | ||
a7f53e26 MA |
456 | /* |
457 | * Does @blk's attached device model have a tray, and is it open? | |
458 | */ | |
459 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 460 | { |
a7f53e26 MA |
461 | if (blk->dev_ops && blk->dev_ops->is_tray_open) { |
462 | return blk->dev_ops->is_tray_open(blk->dev_opaque); | |
463 | } | |
464 | return false; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Does @blk's attached device model have the medium locked? | |
469 | * %false if the device model has no such lock. | |
470 | */ | |
471 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
472 | { | |
473 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
474 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
475 | } | |
476 | return false; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Notify @blk's attached device model of a backend size change. | |
481 | */ | |
482 | void blk_dev_resize_cb(BlockBackend *blk) | |
483 | { | |
484 | if (blk->dev_ops && blk->dev_ops->resize_cb) { | |
485 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
486 | } | |
487 | } | |
488 | ||
489 | void blk_iostatus_enable(BlockBackend *blk) | |
490 | { | |
373340b2 HR |
491 | blk->iostatus_enabled = true; |
492 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
493 | } | |
494 | ||
495 | /* The I/O status is only enabled if the drive explicitly | |
496 | * enables it _and_ the VM is configured to stop on errors */ | |
497 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
498 | { | |
499 | return (blk->iostatus_enabled && | |
500 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
501 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
502 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
503 | } | |
504 | ||
505 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
506 | { | |
507 | return blk->iostatus; | |
508 | } | |
509 | ||
510 | void blk_iostatus_disable(BlockBackend *blk) | |
511 | { | |
512 | blk->iostatus_enabled = false; | |
513 | } | |
514 | ||
515 | void blk_iostatus_reset(BlockBackend *blk) | |
516 | { | |
517 | if (blk_iostatus_is_enabled(blk)) { | |
518 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
519 | if (blk->bs && blk->bs->job) { | |
520 | block_job_iostatus_reset(blk->bs->job); | |
521 | } | |
522 | } | |
523 | } | |
524 | ||
525 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
526 | { | |
527 | assert(blk_iostatus_is_enabled(blk)); | |
528 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
529 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
530 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
531 | } | |
4be74634 MA |
532 | } |
533 | ||
e7f7d676 HR |
534 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
535 | size_t size) | |
536 | { | |
537 | int64_t len; | |
538 | ||
539 | if (size > INT_MAX) { | |
540 | return -EIO; | |
541 | } | |
542 | ||
c09ba36c | 543 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
544 | return -ENOMEDIUM; |
545 | } | |
546 | ||
547 | len = blk_getlength(blk); | |
548 | if (len < 0) { | |
549 | return len; | |
550 | } | |
551 | ||
552 | if (offset < 0) { | |
553 | return -EIO; | |
554 | } | |
555 | ||
556 | if (offset > len || len - offset < size) { | |
557 | return -EIO; | |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | static int blk_check_request(BlockBackend *blk, int64_t sector_num, | |
564 | int nb_sectors) | |
565 | { | |
566 | if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) { | |
567 | return -EIO; | |
568 | } | |
569 | ||
570 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { | |
571 | return -EIO; | |
572 | } | |
573 | ||
574 | return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE, | |
575 | nb_sectors * BDRV_SECTOR_SIZE); | |
576 | } | |
577 | ||
4be74634 MA |
578 | int blk_read(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(blk->bs, sector_num, buf, nb_sectors); |
587 | } | |
588 | ||
589 | int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, 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_read_unthrottled(blk->bs, sector_num, buf, nb_sectors); |
598 | } | |
599 | ||
600 | int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf, | |
601 | int nb_sectors) | |
602 | { | |
e7f7d676 HR |
603 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
604 | if (ret < 0) { | |
605 | return ret; | |
606 | } | |
607 | ||
4be74634 MA |
608 | return bdrv_write(blk->bs, sector_num, buf, nb_sectors); |
609 | } | |
610 | ||
0df89e8e KW |
611 | int blk_write_zeroes(BlockBackend *blk, int64_t sector_num, |
612 | int nb_sectors, BdrvRequestFlags flags) | |
613 | { | |
614 | int ret = blk_check_request(blk, sector_num, nb_sectors); | |
615 | if (ret < 0) { | |
616 | return ret; | |
617 | } | |
618 | ||
619 | return bdrv_write_zeroes(blk->bs, sector_num, nb_sectors, flags); | |
620 | } | |
621 | ||
e7f7d676 HR |
622 | static void error_callback_bh(void *opaque) |
623 | { | |
624 | struct BlockBackendAIOCB *acb = opaque; | |
625 | qemu_bh_delete(acb->bh); | |
626 | acb->common.cb(acb->common.opaque, acb->ret); | |
627 | qemu_aio_unref(acb); | |
628 | } | |
629 | ||
630 | static BlockAIOCB *abort_aio_request(BlockBackend *blk, BlockCompletionFunc *cb, | |
631 | void *opaque, int ret) | |
632 | { | |
633 | struct BlockBackendAIOCB *acb; | |
634 | QEMUBH *bh; | |
635 | ||
636 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); | |
4981bdec | 637 | acb->blk = blk; |
e7f7d676 HR |
638 | acb->ret = ret; |
639 | ||
640 | bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb); | |
641 | acb->bh = bh; | |
642 | qemu_bh_schedule(bh); | |
643 | ||
644 | return &acb->common; | |
645 | } | |
646 | ||
4be74634 MA |
647 | BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num, |
648 | int nb_sectors, BdrvRequestFlags flags, | |
649 | BlockCompletionFunc *cb, void *opaque) | |
650 | { | |
e7f7d676 HR |
651 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
652 | if (ret < 0) { | |
653 | return abort_aio_request(blk, cb, opaque, ret); | |
654 | } | |
655 | ||
4be74634 MA |
656 | return bdrv_aio_write_zeroes(blk->bs, sector_num, nb_sectors, flags, |
657 | cb, opaque); | |
658 | } | |
659 | ||
660 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
661 | { | |
e7f7d676 HR |
662 | int ret = blk_check_byte_request(blk, offset, count); |
663 | if (ret < 0) { | |
664 | return ret; | |
665 | } | |
666 | ||
4be74634 MA |
667 | return bdrv_pread(blk->bs, offset, buf, count); |
668 | } | |
669 | ||
670 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count) | |
671 | { | |
e7f7d676 HR |
672 | int ret = blk_check_byte_request(blk, offset, count); |
673 | if (ret < 0) { | |
674 | return ret; | |
675 | } | |
676 | ||
4be74634 MA |
677 | return bdrv_pwrite(blk->bs, offset, buf, count); |
678 | } | |
679 | ||
680 | int64_t blk_getlength(BlockBackend *blk) | |
681 | { | |
c09ba36c HR |
682 | if (!blk_is_available(blk)) { |
683 | return -ENOMEDIUM; | |
684 | } | |
685 | ||
4be74634 MA |
686 | return bdrv_getlength(blk->bs); |
687 | } | |
688 | ||
689 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
690 | { | |
a46fc9c9 HR |
691 | if (!blk->bs) { |
692 | *nb_sectors_ptr = 0; | |
693 | } else { | |
694 | bdrv_get_geometry(blk->bs, nb_sectors_ptr); | |
695 | } | |
4be74634 MA |
696 | } |
697 | ||
1ef01253 HR |
698 | int64_t blk_nb_sectors(BlockBackend *blk) |
699 | { | |
c09ba36c HR |
700 | if (!blk_is_available(blk)) { |
701 | return -ENOMEDIUM; | |
702 | } | |
703 | ||
1ef01253 HR |
704 | return bdrv_nb_sectors(blk->bs); |
705 | } | |
706 | ||
4be74634 MA |
707 | BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num, |
708 | QEMUIOVector *iov, int nb_sectors, | |
709 | BlockCompletionFunc *cb, void *opaque) | |
710 | { | |
e7f7d676 HR |
711 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
712 | if (ret < 0) { | |
713 | return abort_aio_request(blk, cb, opaque, ret); | |
714 | } | |
715 | ||
4be74634 MA |
716 | return bdrv_aio_readv(blk->bs, sector_num, iov, nb_sectors, cb, opaque); |
717 | } | |
718 | ||
719 | BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, | |
720 | QEMUIOVector *iov, int nb_sectors, | |
721 | BlockCompletionFunc *cb, void *opaque) | |
722 | { | |
e7f7d676 HR |
723 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
724 | if (ret < 0) { | |
725 | return abort_aio_request(blk, cb, opaque, ret); | |
726 | } | |
727 | ||
4be74634 MA |
728 | return bdrv_aio_writev(blk->bs, sector_num, iov, nb_sectors, cb, opaque); |
729 | } | |
730 | ||
731 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
732 | BlockCompletionFunc *cb, void *opaque) | |
733 | { | |
c09ba36c HR |
734 | if (!blk_is_available(blk)) { |
735 | return abort_aio_request(blk, cb, opaque, -ENOMEDIUM); | |
736 | } | |
737 | ||
4be74634 MA |
738 | return bdrv_aio_flush(blk->bs, cb, opaque); |
739 | } | |
740 | ||
741 | BlockAIOCB *blk_aio_discard(BlockBackend *blk, | |
742 | int64_t sector_num, int nb_sectors, | |
743 | BlockCompletionFunc *cb, void *opaque) | |
744 | { | |
e7f7d676 HR |
745 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
746 | if (ret < 0) { | |
747 | return abort_aio_request(blk, cb, opaque, ret); | |
748 | } | |
749 | ||
4be74634 MA |
750 | return bdrv_aio_discard(blk->bs, sector_num, nb_sectors, cb, opaque); |
751 | } | |
752 | ||
753 | void blk_aio_cancel(BlockAIOCB *acb) | |
754 | { | |
755 | bdrv_aio_cancel(acb); | |
756 | } | |
757 | ||
758 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
759 | { | |
760 | bdrv_aio_cancel_async(acb); | |
761 | } | |
762 | ||
763 | int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs) | |
764 | { | |
e7f7d676 HR |
765 | int i, ret; |
766 | ||
767 | for (i = 0; i < num_reqs; i++) { | |
768 | ret = blk_check_request(blk, reqs[i].sector, reqs[i].nb_sectors); | |
769 | if (ret < 0) { | |
770 | return ret; | |
771 | } | |
772 | } | |
773 | ||
4be74634 MA |
774 | return bdrv_aio_multiwrite(blk->bs, reqs, num_reqs); |
775 | } | |
776 | ||
777 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
778 | { | |
c09ba36c HR |
779 | if (!blk_is_available(blk)) { |
780 | return -ENOMEDIUM; | |
781 | } | |
782 | ||
4be74634 MA |
783 | return bdrv_ioctl(blk->bs, req, buf); |
784 | } | |
785 | ||
786 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
787 | BlockCompletionFunc *cb, void *opaque) | |
788 | { | |
c09ba36c HR |
789 | if (!blk_is_available(blk)) { |
790 | return abort_aio_request(blk, cb, opaque, -ENOMEDIUM); | |
791 | } | |
792 | ||
4be74634 MA |
793 | return bdrv_aio_ioctl(blk->bs, req, buf, cb, opaque); |
794 | } | |
795 | ||
2bb0dce7 HR |
796 | int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) |
797 | { | |
e7f7d676 HR |
798 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
799 | if (ret < 0) { | |
800 | return ret; | |
801 | } | |
802 | ||
2bb0dce7 HR |
803 | return bdrv_co_discard(blk->bs, sector_num, nb_sectors); |
804 | } | |
805 | ||
806 | int blk_co_flush(BlockBackend *blk) | |
807 | { | |
c09ba36c HR |
808 | if (!blk_is_available(blk)) { |
809 | return -ENOMEDIUM; | |
810 | } | |
811 | ||
2bb0dce7 HR |
812 | return bdrv_co_flush(blk->bs); |
813 | } | |
814 | ||
4be74634 MA |
815 | int blk_flush(BlockBackend *blk) |
816 | { | |
c09ba36c HR |
817 | if (!blk_is_available(blk)) { |
818 | return -ENOMEDIUM; | |
819 | } | |
820 | ||
4be74634 MA |
821 | return bdrv_flush(blk->bs); |
822 | } | |
823 | ||
824 | int blk_flush_all(void) | |
825 | { | |
826 | return bdrv_flush_all(); | |
827 | } | |
828 | ||
97b0385a AY |
829 | void blk_drain(BlockBackend *blk) |
830 | { | |
a46fc9c9 HR |
831 | if (blk->bs) { |
832 | bdrv_drain(blk->bs); | |
833 | } | |
97b0385a AY |
834 | } |
835 | ||
4be74634 MA |
836 | void blk_drain_all(void) |
837 | { | |
838 | bdrv_drain_all(); | |
839 | } | |
840 | ||
373340b2 HR |
841 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
842 | BlockdevOnError on_write_error) | |
843 | { | |
844 | blk->on_read_error = on_read_error; | |
845 | blk->on_write_error = on_write_error; | |
846 | } | |
847 | ||
4be74634 MA |
848 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
849 | { | |
373340b2 | 850 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
851 | } |
852 | ||
853 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
854 | int error) | |
855 | { | |
373340b2 HR |
856 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
857 | ||
858 | switch (on_err) { | |
859 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
860 | return (error == ENOSPC) ? | |
861 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
862 | case BLOCKDEV_ON_ERROR_STOP: | |
863 | return BLOCK_ERROR_ACTION_STOP; | |
864 | case BLOCKDEV_ON_ERROR_REPORT: | |
865 | return BLOCK_ERROR_ACTION_REPORT; | |
866 | case BLOCKDEV_ON_ERROR_IGNORE: | |
867 | return BLOCK_ERROR_ACTION_IGNORE; | |
868 | default: | |
869 | abort(); | |
870 | } | |
4be74634 MA |
871 | } |
872 | ||
373340b2 HR |
873 | static void send_qmp_error_event(BlockBackend *blk, |
874 | BlockErrorAction action, | |
875 | bool is_read, int error) | |
876 | { | |
877 | IoOperationType optype; | |
878 | ||
879 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
880 | qapi_event_send_block_io_error(blk_name(blk), optype, action, | |
881 | blk_iostatus_is_enabled(blk), | |
882 | error == ENOSPC, strerror(error), | |
883 | &error_abort); | |
884 | } | |
885 | ||
886 | /* This is done by device models because, while the block layer knows | |
887 | * about the error, it does not know whether an operation comes from | |
888 | * the device or the block layer (from a job, for example). | |
889 | */ | |
4be74634 MA |
890 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
891 | bool is_read, int error) | |
892 | { | |
373340b2 HR |
893 | assert(error >= 0); |
894 | ||
895 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
896 | /* First set the iostatus, so that "info block" returns an iostatus | |
897 | * that matches the events raised so far (an additional error iostatus | |
898 | * is fine, but not a lost one). | |
899 | */ | |
900 | blk_iostatus_set_err(blk, error); | |
901 | ||
902 | /* Then raise the request to stop the VM and the event. | |
903 | * qemu_system_vmstop_request_prepare has two effects. First, | |
904 | * it ensures that the STOP event always comes after the | |
905 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
906 | * can observe the STOP event and do a "cont" before the STOP | |
907 | * event is issued, the VM will not stop. In this case, vm_start() | |
908 | * also ensures that the STOP/RESUME pair of events is emitted. | |
909 | */ | |
910 | qemu_system_vmstop_request_prepare(); | |
911 | send_qmp_error_event(blk, action, is_read, error); | |
912 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
913 | } else { | |
914 | send_qmp_error_event(blk, action, is_read, error); | |
915 | } | |
4be74634 MA |
916 | } |
917 | ||
918 | int blk_is_read_only(BlockBackend *blk) | |
919 | { | |
061959e8 HR |
920 | if (blk->bs) { |
921 | return bdrv_is_read_only(blk->bs); | |
922 | } else { | |
923 | return blk->root_state.read_only; | |
924 | } | |
4be74634 MA |
925 | } |
926 | ||
927 | int blk_is_sg(BlockBackend *blk) | |
928 | { | |
a46fc9c9 HR |
929 | if (!blk->bs) { |
930 | return 0; | |
931 | } | |
932 | ||
4be74634 MA |
933 | return bdrv_is_sg(blk->bs); |
934 | } | |
935 | ||
936 | int blk_enable_write_cache(BlockBackend *blk) | |
937 | { | |
061959e8 HR |
938 | if (blk->bs) { |
939 | return bdrv_enable_write_cache(blk->bs); | |
940 | } else { | |
941 | return !!(blk->root_state.open_flags & BDRV_O_CACHE_WB); | |
942 | } | |
4be74634 MA |
943 | } |
944 | ||
945 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
946 | { | |
061959e8 HR |
947 | if (blk->bs) { |
948 | bdrv_set_enable_write_cache(blk->bs, wce); | |
949 | } else { | |
950 | if (wce) { | |
951 | blk->root_state.open_flags |= BDRV_O_CACHE_WB; | |
952 | } else { | |
953 | blk->root_state.open_flags &= ~BDRV_O_CACHE_WB; | |
954 | } | |
955 | } | |
4be74634 MA |
956 | } |
957 | ||
2bb0dce7 HR |
958 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
959 | { | |
c09ba36c HR |
960 | if (!blk->bs) { |
961 | error_setg(errp, "Device '%s' has no medium", blk->name); | |
962 | return; | |
963 | } | |
964 | ||
2bb0dce7 HR |
965 | bdrv_invalidate_cache(blk->bs, errp); |
966 | } | |
967 | ||
e031f750 | 968 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 969 | { |
db0284f8 HR |
970 | return blk->bs && bdrv_is_inserted(blk->bs); |
971 | } | |
972 | ||
973 | bool blk_is_available(BlockBackend *blk) | |
974 | { | |
975 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
976 | } |
977 | ||
978 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
979 | { | |
a46fc9c9 HR |
980 | if (blk->bs) { |
981 | bdrv_lock_medium(blk->bs, locked); | |
982 | } | |
4be74634 MA |
983 | } |
984 | ||
985 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
986 | { | |
a46fc9c9 HR |
987 | if (blk->bs) { |
988 | bdrv_eject(blk->bs, eject_flag); | |
989 | } | |
4be74634 MA |
990 | } |
991 | ||
992 | int blk_get_flags(BlockBackend *blk) | |
993 | { | |
061959e8 HR |
994 | if (blk->bs) { |
995 | return bdrv_get_flags(blk->bs); | |
996 | } else { | |
997 | return blk->root_state.open_flags; | |
998 | } | |
4be74634 MA |
999 | } |
1000 | ||
454057b7 PL |
1001 | int blk_get_max_transfer_length(BlockBackend *blk) |
1002 | { | |
a46fc9c9 HR |
1003 | if (blk->bs) { |
1004 | return blk->bs->bl.max_transfer_length; | |
1005 | } else { | |
1006 | return 0; | |
1007 | } | |
454057b7 PL |
1008 | } |
1009 | ||
4be74634 MA |
1010 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1011 | { | |
68e9ec01 | 1012 | blk->guest_block_size = align; |
4be74634 MA |
1013 | } |
1014 | ||
1015 | void *blk_blockalign(BlockBackend *blk, size_t size) | |
1016 | { | |
1017 | return qemu_blockalign(blk ? blk->bs : NULL, size); | |
1018 | } | |
1019 | ||
1020 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1021 | { | |
a46fc9c9 HR |
1022 | if (!blk->bs) { |
1023 | return false; | |
1024 | } | |
1025 | ||
4be74634 MA |
1026 | return bdrv_op_is_blocked(blk->bs, op, errp); |
1027 | } | |
1028 | ||
1029 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1030 | { | |
a46fc9c9 HR |
1031 | if (blk->bs) { |
1032 | bdrv_op_unblock(blk->bs, op, reason); | |
1033 | } | |
4be74634 MA |
1034 | } |
1035 | ||
1036 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1037 | { | |
a46fc9c9 HR |
1038 | if (blk->bs) { |
1039 | bdrv_op_block_all(blk->bs, reason); | |
1040 | } | |
4be74634 MA |
1041 | } |
1042 | ||
1043 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1044 | { | |
a46fc9c9 HR |
1045 | if (blk->bs) { |
1046 | bdrv_op_unblock_all(blk->bs, reason); | |
1047 | } | |
4be74634 MA |
1048 | } |
1049 | ||
1050 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1051 | { | |
4981bdec HR |
1052 | if (blk->bs) { |
1053 | return bdrv_get_aio_context(blk->bs); | |
1054 | } else { | |
1055 | return qemu_get_aio_context(); | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1060 | { | |
1061 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1062 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1063 | } |
1064 | ||
1065 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1066 | { | |
a46fc9c9 HR |
1067 | if (blk->bs) { |
1068 | bdrv_set_aio_context(blk->bs, new_context); | |
1069 | } | |
4be74634 MA |
1070 | } |
1071 | ||
2019ba0a HR |
1072 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1073 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1074 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1075 | { | |
a46fc9c9 HR |
1076 | if (blk->bs) { |
1077 | bdrv_add_aio_context_notifier(blk->bs, attached_aio_context, | |
1078 | detach_aio_context, opaque); | |
1079 | } | |
2019ba0a HR |
1080 | } |
1081 | ||
1082 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1083 | void (*attached_aio_context)(AioContext *, | |
1084 | void *), | |
1085 | void (*detach_aio_context)(void *), | |
1086 | void *opaque) | |
1087 | { | |
a46fc9c9 HR |
1088 | if (blk->bs) { |
1089 | bdrv_remove_aio_context_notifier(blk->bs, attached_aio_context, | |
1090 | detach_aio_context, opaque); | |
1091 | } | |
2019ba0a HR |
1092 | } |
1093 | ||
2c28b21f HR |
1094 | void blk_add_close_notifier(BlockBackend *blk, Notifier *notify) |
1095 | { | |
a46fc9c9 HR |
1096 | if (blk->bs) { |
1097 | bdrv_add_close_notifier(blk->bs, notify); | |
1098 | } | |
2c28b21f HR |
1099 | } |
1100 | ||
4be74634 MA |
1101 | void blk_io_plug(BlockBackend *blk) |
1102 | { | |
a46fc9c9 HR |
1103 | if (blk->bs) { |
1104 | bdrv_io_plug(blk->bs); | |
1105 | } | |
4be74634 MA |
1106 | } |
1107 | ||
1108 | void blk_io_unplug(BlockBackend *blk) | |
1109 | { | |
a46fc9c9 HR |
1110 | if (blk->bs) { |
1111 | bdrv_io_unplug(blk->bs); | |
1112 | } | |
4be74634 MA |
1113 | } |
1114 | ||
1115 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1116 | { | |
7f0e9da6 | 1117 | return &blk->stats; |
4be74634 MA |
1118 | } |
1119 | ||
1120 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1121 | BlockCompletionFunc *cb, void *opaque) | |
1122 | { | |
1123 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1124 | } | |
1ef01253 HR |
1125 | |
1126 | int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num, | |
1127 | int nb_sectors, BdrvRequestFlags flags) | |
1128 | { | |
e7f7d676 HR |
1129 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1130 | if (ret < 0) { | |
1131 | return ret; | |
1132 | } | |
1133 | ||
1ef01253 HR |
1134 | return bdrv_co_write_zeroes(blk->bs, sector_num, nb_sectors, flags); |
1135 | } | |
1136 | ||
1137 | int blk_write_compressed(BlockBackend *blk, int64_t sector_num, | |
1138 | const uint8_t *buf, int nb_sectors) | |
1139 | { | |
e7f7d676 HR |
1140 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1141 | if (ret < 0) { | |
1142 | return ret; | |
1143 | } | |
1144 | ||
1ef01253 HR |
1145 | return bdrv_write_compressed(blk->bs, sector_num, buf, nb_sectors); |
1146 | } | |
1147 | ||
1148 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1149 | { | |
c09ba36c HR |
1150 | if (!blk_is_available(blk)) { |
1151 | return -ENOMEDIUM; | |
1152 | } | |
1153 | ||
1ef01253 HR |
1154 | return bdrv_truncate(blk->bs, offset); |
1155 | } | |
1156 | ||
1157 | int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) | |
1158 | { | |
e7f7d676 HR |
1159 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1160 | if (ret < 0) { | |
1161 | return ret; | |
1162 | } | |
1163 | ||
1ef01253 HR |
1164 | return bdrv_discard(blk->bs, sector_num, nb_sectors); |
1165 | } | |
1166 | ||
1167 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1168 | int64_t pos, int size) | |
1169 | { | |
c09ba36c HR |
1170 | if (!blk_is_available(blk)) { |
1171 | return -ENOMEDIUM; | |
1172 | } | |
1173 | ||
1ef01253 HR |
1174 | return bdrv_save_vmstate(blk->bs, buf, pos, size); |
1175 | } | |
1176 | ||
1177 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1178 | { | |
c09ba36c HR |
1179 | if (!blk_is_available(blk)) { |
1180 | return -ENOMEDIUM; | |
1181 | } | |
1182 | ||
1ef01253 HR |
1183 | return bdrv_load_vmstate(blk->bs, buf, pos, size); |
1184 | } | |
f0272c4d ET |
1185 | |
1186 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1187 | { | |
c09ba36c HR |
1188 | if (!blk_is_available(blk)) { |
1189 | return -ENOMEDIUM; | |
1190 | } | |
1191 | ||
f0272c4d ET |
1192 | return bdrv_probe_blocksizes(blk->bs, bsz); |
1193 | } | |
1194 | ||
1195 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1196 | { | |
c09ba36c HR |
1197 | if (!blk_is_available(blk)) { |
1198 | return -ENOMEDIUM; | |
1199 | } | |
1200 | ||
f0272c4d ET |
1201 | return bdrv_probe_geometry(blk->bs, geo); |
1202 | } | |
281d22d8 HR |
1203 | |
1204 | /* | |
1205 | * Updates the BlockBackendRootState object with data from the currently | |
1206 | * attached BlockDriverState. | |
1207 | */ | |
1208 | void blk_update_root_state(BlockBackend *blk) | |
1209 | { | |
1210 | assert(blk->bs); | |
1211 | ||
1212 | blk->root_state.open_flags = blk->bs->open_flags; | |
1213 | blk->root_state.read_only = blk->bs->read_only; | |
1214 | blk->root_state.detect_zeroes = blk->bs->detect_zeroes; | |
1215 | ||
1216 | if (blk->root_state.throttle_group) { | |
1217 | g_free(blk->root_state.throttle_group); | |
1218 | throttle_group_unref(blk->root_state.throttle_state); | |
1219 | } | |
1220 | if (blk->bs->throttle_state) { | |
1221 | const char *name = throttle_group_get_name(blk->bs); | |
1222 | blk->root_state.throttle_group = g_strdup(name); | |
1223 | blk->root_state.throttle_state = throttle_group_incref(name); | |
1224 | } else { | |
1225 | blk->root_state.throttle_group = NULL; | |
1226 | blk->root_state.throttle_state = NULL; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) | |
1231 | { | |
1232 | return &blk->root_state; | |
1233 | } |