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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); |
979e9b03 | 179 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
180 | g_free(blk); |
181 | } | |
182 | ||
8fb3c76c MA |
183 | static void drive_info_del(DriveInfo *dinfo) |
184 | { | |
185 | if (!dinfo) { | |
186 | return; | |
187 | } | |
188 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
189 | g_free(dinfo->serial); |
190 | g_free(dinfo); | |
191 | } | |
192 | ||
f636ae85 AG |
193 | int blk_get_refcnt(BlockBackend *blk) |
194 | { | |
195 | return blk ? blk->refcnt : 0; | |
196 | } | |
197 | ||
26f54e9a MA |
198 | /* |
199 | * Increment @blk's reference count. | |
200 | * @blk must not be null. | |
201 | */ | |
202 | void blk_ref(BlockBackend *blk) | |
203 | { | |
204 | blk->refcnt++; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Decrement @blk's reference count. | |
209 | * If this drops it to zero, destroy @blk. | |
210 | * For convenience, do nothing if @blk is null. | |
211 | */ | |
212 | void blk_unref(BlockBackend *blk) | |
213 | { | |
214 | if (blk) { | |
215 | assert(blk->refcnt > 0); | |
216 | if (!--blk->refcnt) { | |
217 | blk_delete(blk); | |
218 | } | |
219 | } | |
220 | } | |
221 | ||
222 | /* | |
223 | * Return the BlockBackend after @blk. | |
224 | * If @blk is null, return the first one. | |
225 | * Else, return @blk's next sibling, which may be null. | |
226 | * | |
227 | * To iterate over all BlockBackends, do | |
228 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
229 | * ... | |
230 | * } | |
231 | */ | |
232 | BlockBackend *blk_next(BlockBackend *blk) | |
233 | { | |
234 | return blk ? QTAILQ_NEXT(blk, link) : QTAILQ_FIRST(&blk_backends); | |
235 | } | |
236 | ||
237 | /* | |
7e7d56d9 MA |
238 | * Return @blk's name, a non-null string. |
239 | * Wart: the name is empty iff @blk has been hidden with | |
3e5a50d6 | 240 | * blk_hide_on_behalf_of_hmp_drive_del(). |
26f54e9a MA |
241 | */ |
242 | const char *blk_name(BlockBackend *blk) | |
243 | { | |
244 | return blk->name; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Return the BlockBackend with name @name if it exists, else null. | |
249 | * @name must not be null. | |
250 | */ | |
251 | BlockBackend *blk_by_name(const char *name) | |
252 | { | |
253 | BlockBackend *blk; | |
254 | ||
255 | assert(name); | |
256 | QTAILQ_FOREACH(blk, &blk_backends, link) { | |
257 | if (!strcmp(name, blk->name)) { | |
258 | return blk; | |
259 | } | |
260 | } | |
261 | return NULL; | |
262 | } | |
7e7d56d9 MA |
263 | |
264 | /* | |
265 | * Return the BlockDriverState attached to @blk if any, else null. | |
266 | */ | |
267 | BlockDriverState *blk_bs(BlockBackend *blk) | |
268 | { | |
269 | return blk->bs; | |
270 | } | |
271 | ||
a2d61900 KW |
272 | /* |
273 | * Changes the BlockDriverState attached to @blk | |
274 | */ | |
275 | void blk_set_bs(BlockBackend *blk, BlockDriverState *bs) | |
276 | { | |
277 | bdrv_ref(bs); | |
278 | ||
279 | if (blk->bs) { | |
280 | blk->bs->blk = NULL; | |
281 | bdrv_unref(blk->bs); | |
282 | } | |
283 | assert(bs->blk == NULL); | |
284 | ||
285 | blk->bs = bs; | |
286 | bs->blk = blk; | |
287 | } | |
288 | ||
18e46a03 MA |
289 | /* |
290 | * Return @blk's DriveInfo if any, else null. | |
291 | */ | |
292 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
293 | { | |
294 | return blk->legacy_dinfo; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Set @blk's DriveInfo to @dinfo, and return it. | |
299 | * @blk must not have a DriveInfo set already. | |
300 | * No other BlockBackend may have the same DriveInfo set. | |
301 | */ | |
302 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
303 | { | |
304 | assert(!blk->legacy_dinfo); | |
305 | return blk->legacy_dinfo = dinfo; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Return the BlockBackend with DriveInfo @dinfo. | |
310 | * It must exist. | |
311 | */ | |
312 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
313 | { | |
314 | BlockBackend *blk; | |
315 | ||
316 | QTAILQ_FOREACH(blk, &blk_backends, link) { | |
317 | if (blk->legacy_dinfo == dinfo) { | |
318 | return blk; | |
319 | } | |
320 | } | |
321 | abort(); | |
322 | } | |
323 | ||
7e7d56d9 MA |
324 | /* |
325 | * Hide @blk. | |
326 | * @blk must not have been hidden already. | |
327 | * Make attached BlockDriverState, if any, anonymous. | |
328 | * Once hidden, @blk is invisible to all functions that don't receive | |
329 | * it as argument. For example, blk_by_name() won't return it. | |
330 | * Strictly for use by do_drive_del(). | |
331 | * TODO get rid of it! | |
332 | */ | |
3e5a50d6 | 333 | void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk) |
7e7d56d9 MA |
334 | { |
335 | QTAILQ_REMOVE(&blk_backends, blk, link); | |
336 | blk->name[0] = 0; | |
337 | if (blk->bs) { | |
338 | bdrv_make_anon(blk->bs); | |
339 | } | |
340 | } | |
4be74634 | 341 | |
1c95f7e1 HR |
342 | /* |
343 | * Disassociates the currently associated BlockDriverState from @blk. | |
344 | */ | |
345 | void blk_remove_bs(BlockBackend *blk) | |
346 | { | |
347 | blk_update_root_state(blk); | |
348 | ||
349 | blk->bs->blk = NULL; | |
350 | bdrv_unref(blk->bs); | |
351 | blk->bs = NULL; | |
352 | } | |
353 | ||
0c3c36d6 HR |
354 | /* |
355 | * Associates a new BlockDriverState with @blk. | |
356 | */ | |
357 | void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) | |
358 | { | |
359 | assert(!blk->bs && !bs->blk); | |
360 | bdrv_ref(bs); | |
361 | blk->bs = bs; | |
362 | bs->blk = blk; | |
363 | } | |
364 | ||
a7f53e26 MA |
365 | /* |
366 | * Attach device model @dev to @blk. | |
367 | * Return 0 on success, -EBUSY when a device model is attached already. | |
368 | */ | |
4be74634 | 369 | int blk_attach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 370 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 371 | { |
a7f53e26 MA |
372 | if (blk->dev) { |
373 | return -EBUSY; | |
374 | } | |
84ebe375 | 375 | blk_ref(blk); |
a7f53e26 | 376 | blk->dev = dev; |
373340b2 | 377 | blk_iostatus_reset(blk); |
a7f53e26 | 378 | return 0; |
4be74634 MA |
379 | } |
380 | ||
a7f53e26 MA |
381 | /* |
382 | * Attach device model @dev to @blk. | |
383 | * @blk must not have a device model attached already. | |
384 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
385 | */ | |
4be74634 MA |
386 | void blk_attach_dev_nofail(BlockBackend *blk, void *dev) |
387 | { | |
a7f53e26 MA |
388 | if (blk_attach_dev(blk, dev) < 0) { |
389 | abort(); | |
390 | } | |
4be74634 MA |
391 | } |
392 | ||
a7f53e26 MA |
393 | /* |
394 | * Detach device model @dev from @blk. | |
395 | * @dev must be currently attached to @blk. | |
396 | */ | |
4be74634 | 397 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 398 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 399 | { |
a7f53e26 MA |
400 | assert(blk->dev == dev); |
401 | blk->dev = NULL; | |
402 | blk->dev_ops = NULL; | |
403 | blk->dev_opaque = NULL; | |
68e9ec01 | 404 | blk->guest_block_size = 512; |
84ebe375 | 405 | blk_unref(blk); |
4be74634 MA |
406 | } |
407 | ||
a7f53e26 MA |
408 | /* |
409 | * Return the device model attached to @blk if any, else null. | |
410 | */ | |
4be74634 | 411 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
412 | /* TODO change to return DeviceState * when all users are qdevified */ |
413 | { | |
414 | return blk->dev; | |
415 | } | |
416 | ||
417 | /* | |
418 | * Set @blk's device model callbacks to @ops. | |
419 | * @opaque is the opaque argument to pass to the callbacks. | |
420 | * This is for use by device models. | |
421 | */ | |
422 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
423 | void *opaque) | |
424 | { | |
425 | blk->dev_ops = ops; | |
426 | blk->dev_opaque = opaque; | |
427 | } | |
428 | ||
429 | /* | |
430 | * Notify @blk's attached device model of media change. | |
431 | * If @load is true, notify of media load. | |
432 | * Else, notify of media eject. | |
433 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
434 | */ | |
435 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
436 | { | |
437 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 438 | bool tray_was_open, tray_is_open; |
a7f53e26 | 439 | |
f1f57066 | 440 | tray_was_open = blk_dev_is_tray_open(blk); |
a7f53e26 | 441 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); |
f1f57066 HR |
442 | tray_is_open = blk_dev_is_tray_open(blk); |
443 | ||
444 | if (tray_was_open != tray_is_open) { | |
445 | qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open, | |
446 | &error_abort); | |
a7f53e26 MA |
447 | } |
448 | } | |
449 | } | |
450 | ||
451 | /* | |
452 | * Does @blk's attached device model have removable media? | |
453 | * %true if no device model is attached. | |
454 | */ | |
455 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
456 | { | |
457 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
458 | } | |
459 | ||
460 | /* | |
461 | * Notify @blk's attached device model of a media eject request. | |
462 | * If @force is true, the medium is about to be yanked out forcefully. | |
463 | */ | |
464 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 465 | { |
a7f53e26 MA |
466 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
467 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
468 | } | |
4be74634 MA |
469 | } |
470 | ||
a7f53e26 MA |
471 | /* |
472 | * Does @blk's attached device model have a tray, and is it open? | |
473 | */ | |
474 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 475 | { |
a7f53e26 MA |
476 | if (blk->dev_ops && blk->dev_ops->is_tray_open) { |
477 | return blk->dev_ops->is_tray_open(blk->dev_opaque); | |
478 | } | |
479 | return false; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Does @blk's attached device model have the medium locked? | |
484 | * %false if the device model has no such lock. | |
485 | */ | |
486 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
487 | { | |
488 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
489 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
490 | } | |
491 | return false; | |
492 | } | |
493 | ||
494 | /* | |
495 | * Notify @blk's attached device model of a backend size change. | |
496 | */ | |
497 | void blk_dev_resize_cb(BlockBackend *blk) | |
498 | { | |
499 | if (blk->dev_ops && blk->dev_ops->resize_cb) { | |
500 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
501 | } | |
502 | } | |
503 | ||
504 | void blk_iostatus_enable(BlockBackend *blk) | |
505 | { | |
373340b2 HR |
506 | blk->iostatus_enabled = true; |
507 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
508 | } | |
509 | ||
510 | /* The I/O status is only enabled if the drive explicitly | |
511 | * enables it _and_ the VM is configured to stop on errors */ | |
512 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
513 | { | |
514 | return (blk->iostatus_enabled && | |
515 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
516 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
517 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
518 | } | |
519 | ||
520 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
521 | { | |
522 | return blk->iostatus; | |
523 | } | |
524 | ||
525 | void blk_iostatus_disable(BlockBackend *blk) | |
526 | { | |
527 | blk->iostatus_enabled = false; | |
528 | } | |
529 | ||
530 | void blk_iostatus_reset(BlockBackend *blk) | |
531 | { | |
532 | if (blk_iostatus_is_enabled(blk)) { | |
533 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
534 | if (blk->bs && blk->bs->job) { | |
535 | block_job_iostatus_reset(blk->bs->job); | |
536 | } | |
537 | } | |
538 | } | |
539 | ||
540 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
541 | { | |
542 | assert(blk_iostatus_is_enabled(blk)); | |
543 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
544 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
545 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
546 | } | |
4be74634 MA |
547 | } |
548 | ||
e7f7d676 HR |
549 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
550 | size_t size) | |
551 | { | |
552 | int64_t len; | |
553 | ||
554 | if (size > INT_MAX) { | |
555 | return -EIO; | |
556 | } | |
557 | ||
c09ba36c | 558 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
559 | return -ENOMEDIUM; |
560 | } | |
561 | ||
562 | len = blk_getlength(blk); | |
563 | if (len < 0) { | |
564 | return len; | |
565 | } | |
566 | ||
567 | if (offset < 0) { | |
568 | return -EIO; | |
569 | } | |
570 | ||
571 | if (offset > len || len - offset < size) { | |
572 | return -EIO; | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int blk_check_request(BlockBackend *blk, int64_t sector_num, | |
579 | int nb_sectors) | |
580 | { | |
581 | if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) { | |
582 | return -EIO; | |
583 | } | |
584 | ||
585 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { | |
586 | return -EIO; | |
587 | } | |
588 | ||
589 | return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE, | |
590 | nb_sectors * BDRV_SECTOR_SIZE); | |
591 | } | |
592 | ||
4be74634 MA |
593 | int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf, |
594 | int nb_sectors) | |
595 | { | |
e7f7d676 HR |
596 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
597 | if (ret < 0) { | |
598 | return ret; | |
599 | } | |
600 | ||
4be74634 MA |
601 | return bdrv_read(blk->bs, sector_num, buf, nb_sectors); |
602 | } | |
603 | ||
604 | int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf, | |
605 | int nb_sectors) | |
606 | { | |
e7f7d676 HR |
607 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
608 | if (ret < 0) { | |
609 | return ret; | |
610 | } | |
611 | ||
4be74634 MA |
612 | return bdrv_read_unthrottled(blk->bs, sector_num, buf, nb_sectors); |
613 | } | |
614 | ||
615 | int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf, | |
616 | int nb_sectors) | |
617 | { | |
e7f7d676 HR |
618 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
619 | if (ret < 0) { | |
620 | return ret; | |
621 | } | |
622 | ||
4be74634 MA |
623 | return bdrv_write(blk->bs, sector_num, buf, nb_sectors); |
624 | } | |
625 | ||
0df89e8e KW |
626 | int blk_write_zeroes(BlockBackend *blk, int64_t sector_num, |
627 | int nb_sectors, BdrvRequestFlags flags) | |
628 | { | |
629 | int ret = blk_check_request(blk, sector_num, nb_sectors); | |
630 | if (ret < 0) { | |
631 | return ret; | |
632 | } | |
633 | ||
634 | return bdrv_write_zeroes(blk->bs, sector_num, nb_sectors, flags); | |
635 | } | |
636 | ||
e7f7d676 HR |
637 | static void error_callback_bh(void *opaque) |
638 | { | |
639 | struct BlockBackendAIOCB *acb = opaque; | |
640 | qemu_bh_delete(acb->bh); | |
641 | acb->common.cb(acb->common.opaque, acb->ret); | |
642 | qemu_aio_unref(acb); | |
643 | } | |
644 | ||
645 | static BlockAIOCB *abort_aio_request(BlockBackend *blk, BlockCompletionFunc *cb, | |
646 | void *opaque, int ret) | |
647 | { | |
648 | struct BlockBackendAIOCB *acb; | |
649 | QEMUBH *bh; | |
650 | ||
651 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); | |
4981bdec | 652 | acb->blk = blk; |
e7f7d676 HR |
653 | acb->ret = ret; |
654 | ||
655 | bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb); | |
656 | acb->bh = bh; | |
657 | qemu_bh_schedule(bh); | |
658 | ||
659 | return &acb->common; | |
660 | } | |
661 | ||
4be74634 MA |
662 | BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num, |
663 | int nb_sectors, BdrvRequestFlags flags, | |
664 | BlockCompletionFunc *cb, void *opaque) | |
665 | { | |
e7f7d676 HR |
666 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
667 | if (ret < 0) { | |
668 | return abort_aio_request(blk, cb, opaque, ret); | |
669 | } | |
670 | ||
4be74634 MA |
671 | return bdrv_aio_write_zeroes(blk->bs, sector_num, nb_sectors, flags, |
672 | cb, opaque); | |
673 | } | |
674 | ||
675 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
676 | { | |
e7f7d676 HR |
677 | int ret = blk_check_byte_request(blk, offset, count); |
678 | if (ret < 0) { | |
679 | return ret; | |
680 | } | |
681 | ||
4be74634 MA |
682 | return bdrv_pread(blk->bs, offset, buf, count); |
683 | } | |
684 | ||
685 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count) | |
686 | { | |
e7f7d676 HR |
687 | int ret = blk_check_byte_request(blk, offset, count); |
688 | if (ret < 0) { | |
689 | return ret; | |
690 | } | |
691 | ||
4be74634 MA |
692 | return bdrv_pwrite(blk->bs, offset, buf, count); |
693 | } | |
694 | ||
695 | int64_t blk_getlength(BlockBackend *blk) | |
696 | { | |
c09ba36c HR |
697 | if (!blk_is_available(blk)) { |
698 | return -ENOMEDIUM; | |
699 | } | |
700 | ||
4be74634 MA |
701 | return bdrv_getlength(blk->bs); |
702 | } | |
703 | ||
704 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
705 | { | |
a46fc9c9 HR |
706 | if (!blk->bs) { |
707 | *nb_sectors_ptr = 0; | |
708 | } else { | |
709 | bdrv_get_geometry(blk->bs, nb_sectors_ptr); | |
710 | } | |
4be74634 MA |
711 | } |
712 | ||
1ef01253 HR |
713 | int64_t blk_nb_sectors(BlockBackend *blk) |
714 | { | |
c09ba36c HR |
715 | if (!blk_is_available(blk)) { |
716 | return -ENOMEDIUM; | |
717 | } | |
718 | ||
1ef01253 HR |
719 | return bdrv_nb_sectors(blk->bs); |
720 | } | |
721 | ||
4be74634 MA |
722 | BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num, |
723 | QEMUIOVector *iov, int nb_sectors, | |
724 | BlockCompletionFunc *cb, void *opaque) | |
725 | { | |
e7f7d676 HR |
726 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
727 | if (ret < 0) { | |
728 | return abort_aio_request(blk, cb, opaque, ret); | |
729 | } | |
730 | ||
4be74634 MA |
731 | return bdrv_aio_readv(blk->bs, sector_num, iov, nb_sectors, cb, opaque); |
732 | } | |
733 | ||
734 | BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, | |
735 | QEMUIOVector *iov, int nb_sectors, | |
736 | BlockCompletionFunc *cb, void *opaque) | |
737 | { | |
e7f7d676 HR |
738 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
739 | if (ret < 0) { | |
740 | return abort_aio_request(blk, cb, opaque, ret); | |
741 | } | |
742 | ||
4be74634 MA |
743 | return bdrv_aio_writev(blk->bs, sector_num, iov, nb_sectors, cb, opaque); |
744 | } | |
745 | ||
746 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
747 | BlockCompletionFunc *cb, void *opaque) | |
748 | { | |
c09ba36c HR |
749 | if (!blk_is_available(blk)) { |
750 | return abort_aio_request(blk, cb, opaque, -ENOMEDIUM); | |
751 | } | |
752 | ||
4be74634 MA |
753 | return bdrv_aio_flush(blk->bs, cb, opaque); |
754 | } | |
755 | ||
756 | BlockAIOCB *blk_aio_discard(BlockBackend *blk, | |
757 | int64_t sector_num, int nb_sectors, | |
758 | BlockCompletionFunc *cb, void *opaque) | |
759 | { | |
e7f7d676 HR |
760 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
761 | if (ret < 0) { | |
762 | return abort_aio_request(blk, cb, opaque, ret); | |
763 | } | |
764 | ||
4be74634 MA |
765 | return bdrv_aio_discard(blk->bs, sector_num, nb_sectors, cb, opaque); |
766 | } | |
767 | ||
768 | void blk_aio_cancel(BlockAIOCB *acb) | |
769 | { | |
770 | bdrv_aio_cancel(acb); | |
771 | } | |
772 | ||
773 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
774 | { | |
775 | bdrv_aio_cancel_async(acb); | |
776 | } | |
777 | ||
778 | int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs) | |
779 | { | |
e7f7d676 HR |
780 | int i, ret; |
781 | ||
782 | for (i = 0; i < num_reqs; i++) { | |
783 | ret = blk_check_request(blk, reqs[i].sector, reqs[i].nb_sectors); | |
784 | if (ret < 0) { | |
785 | return ret; | |
786 | } | |
787 | } | |
788 | ||
4be74634 MA |
789 | return bdrv_aio_multiwrite(blk->bs, reqs, num_reqs); |
790 | } | |
791 | ||
792 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
793 | { | |
c09ba36c HR |
794 | if (!blk_is_available(blk)) { |
795 | return -ENOMEDIUM; | |
796 | } | |
797 | ||
4be74634 MA |
798 | return bdrv_ioctl(blk->bs, req, buf); |
799 | } | |
800 | ||
801 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
802 | BlockCompletionFunc *cb, void *opaque) | |
803 | { | |
c09ba36c HR |
804 | if (!blk_is_available(blk)) { |
805 | return abort_aio_request(blk, cb, opaque, -ENOMEDIUM); | |
806 | } | |
807 | ||
4be74634 MA |
808 | return bdrv_aio_ioctl(blk->bs, req, buf, cb, opaque); |
809 | } | |
810 | ||
2bb0dce7 HR |
811 | int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) |
812 | { | |
e7f7d676 HR |
813 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
814 | if (ret < 0) { | |
815 | return ret; | |
816 | } | |
817 | ||
2bb0dce7 HR |
818 | return bdrv_co_discard(blk->bs, sector_num, nb_sectors); |
819 | } | |
820 | ||
821 | int blk_co_flush(BlockBackend *blk) | |
822 | { | |
c09ba36c HR |
823 | if (!blk_is_available(blk)) { |
824 | return -ENOMEDIUM; | |
825 | } | |
826 | ||
2bb0dce7 HR |
827 | return bdrv_co_flush(blk->bs); |
828 | } | |
829 | ||
4be74634 MA |
830 | int blk_flush(BlockBackend *blk) |
831 | { | |
c09ba36c HR |
832 | if (!blk_is_available(blk)) { |
833 | return -ENOMEDIUM; | |
834 | } | |
835 | ||
4be74634 MA |
836 | return bdrv_flush(blk->bs); |
837 | } | |
838 | ||
839 | int blk_flush_all(void) | |
840 | { | |
841 | return bdrv_flush_all(); | |
842 | } | |
843 | ||
97b0385a AY |
844 | void blk_drain(BlockBackend *blk) |
845 | { | |
a46fc9c9 HR |
846 | if (blk->bs) { |
847 | bdrv_drain(blk->bs); | |
848 | } | |
97b0385a AY |
849 | } |
850 | ||
4be74634 MA |
851 | void blk_drain_all(void) |
852 | { | |
853 | bdrv_drain_all(); | |
854 | } | |
855 | ||
373340b2 HR |
856 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
857 | BlockdevOnError on_write_error) | |
858 | { | |
859 | blk->on_read_error = on_read_error; | |
860 | blk->on_write_error = on_write_error; | |
861 | } | |
862 | ||
4be74634 MA |
863 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
864 | { | |
373340b2 | 865 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
866 | } |
867 | ||
868 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
869 | int error) | |
870 | { | |
373340b2 HR |
871 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
872 | ||
873 | switch (on_err) { | |
874 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
875 | return (error == ENOSPC) ? | |
876 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
877 | case BLOCKDEV_ON_ERROR_STOP: | |
878 | return BLOCK_ERROR_ACTION_STOP; | |
879 | case BLOCKDEV_ON_ERROR_REPORT: | |
880 | return BLOCK_ERROR_ACTION_REPORT; | |
881 | case BLOCKDEV_ON_ERROR_IGNORE: | |
882 | return BLOCK_ERROR_ACTION_IGNORE; | |
883 | default: | |
884 | abort(); | |
885 | } | |
4be74634 MA |
886 | } |
887 | ||
373340b2 HR |
888 | static void send_qmp_error_event(BlockBackend *blk, |
889 | BlockErrorAction action, | |
890 | bool is_read, int error) | |
891 | { | |
892 | IoOperationType optype; | |
893 | ||
894 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
895 | qapi_event_send_block_io_error(blk_name(blk), optype, action, | |
896 | blk_iostatus_is_enabled(blk), | |
897 | error == ENOSPC, strerror(error), | |
898 | &error_abort); | |
899 | } | |
900 | ||
901 | /* This is done by device models because, while the block layer knows | |
902 | * about the error, it does not know whether an operation comes from | |
903 | * the device or the block layer (from a job, for example). | |
904 | */ | |
4be74634 MA |
905 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
906 | bool is_read, int error) | |
907 | { | |
373340b2 HR |
908 | assert(error >= 0); |
909 | ||
910 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
911 | /* First set the iostatus, so that "info block" returns an iostatus | |
912 | * that matches the events raised so far (an additional error iostatus | |
913 | * is fine, but not a lost one). | |
914 | */ | |
915 | blk_iostatus_set_err(blk, error); | |
916 | ||
917 | /* Then raise the request to stop the VM and the event. | |
918 | * qemu_system_vmstop_request_prepare has two effects. First, | |
919 | * it ensures that the STOP event always comes after the | |
920 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
921 | * can observe the STOP event and do a "cont" before the STOP | |
922 | * event is issued, the VM will not stop. In this case, vm_start() | |
923 | * also ensures that the STOP/RESUME pair of events is emitted. | |
924 | */ | |
925 | qemu_system_vmstop_request_prepare(); | |
926 | send_qmp_error_event(blk, action, is_read, error); | |
927 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
928 | } else { | |
929 | send_qmp_error_event(blk, action, is_read, error); | |
930 | } | |
4be74634 MA |
931 | } |
932 | ||
933 | int blk_is_read_only(BlockBackend *blk) | |
934 | { | |
061959e8 HR |
935 | if (blk->bs) { |
936 | return bdrv_is_read_only(blk->bs); | |
937 | } else { | |
938 | return blk->root_state.read_only; | |
939 | } | |
4be74634 MA |
940 | } |
941 | ||
942 | int blk_is_sg(BlockBackend *blk) | |
943 | { | |
a46fc9c9 HR |
944 | if (!blk->bs) { |
945 | return 0; | |
946 | } | |
947 | ||
4be74634 MA |
948 | return bdrv_is_sg(blk->bs); |
949 | } | |
950 | ||
951 | int blk_enable_write_cache(BlockBackend *blk) | |
952 | { | |
061959e8 HR |
953 | if (blk->bs) { |
954 | return bdrv_enable_write_cache(blk->bs); | |
955 | } else { | |
956 | return !!(blk->root_state.open_flags & BDRV_O_CACHE_WB); | |
957 | } | |
4be74634 MA |
958 | } |
959 | ||
960 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
961 | { | |
061959e8 HR |
962 | if (blk->bs) { |
963 | bdrv_set_enable_write_cache(blk->bs, wce); | |
964 | } else { | |
965 | if (wce) { | |
966 | blk->root_state.open_flags |= BDRV_O_CACHE_WB; | |
967 | } else { | |
968 | blk->root_state.open_flags &= ~BDRV_O_CACHE_WB; | |
969 | } | |
970 | } | |
4be74634 MA |
971 | } |
972 | ||
2bb0dce7 HR |
973 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
974 | { | |
c09ba36c HR |
975 | if (!blk->bs) { |
976 | error_setg(errp, "Device '%s' has no medium", blk->name); | |
977 | return; | |
978 | } | |
979 | ||
2bb0dce7 HR |
980 | bdrv_invalidate_cache(blk->bs, errp); |
981 | } | |
982 | ||
e031f750 | 983 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 984 | { |
db0284f8 HR |
985 | return blk->bs && bdrv_is_inserted(blk->bs); |
986 | } | |
987 | ||
988 | bool blk_is_available(BlockBackend *blk) | |
989 | { | |
990 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
991 | } |
992 | ||
993 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
994 | { | |
a46fc9c9 HR |
995 | if (blk->bs) { |
996 | bdrv_lock_medium(blk->bs, locked); | |
997 | } | |
4be74634 MA |
998 | } |
999 | ||
1000 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1001 | { | |
a46fc9c9 HR |
1002 | if (blk->bs) { |
1003 | bdrv_eject(blk->bs, eject_flag); | |
1004 | } | |
4be74634 MA |
1005 | } |
1006 | ||
1007 | int blk_get_flags(BlockBackend *blk) | |
1008 | { | |
061959e8 HR |
1009 | if (blk->bs) { |
1010 | return bdrv_get_flags(blk->bs); | |
1011 | } else { | |
1012 | return blk->root_state.open_flags; | |
1013 | } | |
4be74634 MA |
1014 | } |
1015 | ||
454057b7 PL |
1016 | int blk_get_max_transfer_length(BlockBackend *blk) |
1017 | { | |
a46fc9c9 HR |
1018 | if (blk->bs) { |
1019 | return blk->bs->bl.max_transfer_length; | |
1020 | } else { | |
1021 | return 0; | |
1022 | } | |
454057b7 PL |
1023 | } |
1024 | ||
4be74634 MA |
1025 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1026 | { | |
68e9ec01 | 1027 | blk->guest_block_size = align; |
4be74634 MA |
1028 | } |
1029 | ||
1030 | void *blk_blockalign(BlockBackend *blk, size_t size) | |
1031 | { | |
1032 | return qemu_blockalign(blk ? blk->bs : NULL, size); | |
1033 | } | |
1034 | ||
1035 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1036 | { | |
a46fc9c9 HR |
1037 | if (!blk->bs) { |
1038 | return false; | |
1039 | } | |
1040 | ||
4be74634 MA |
1041 | return bdrv_op_is_blocked(blk->bs, op, errp); |
1042 | } | |
1043 | ||
1044 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1045 | { | |
a46fc9c9 HR |
1046 | if (blk->bs) { |
1047 | bdrv_op_unblock(blk->bs, op, reason); | |
1048 | } | |
4be74634 MA |
1049 | } |
1050 | ||
1051 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1052 | { | |
a46fc9c9 HR |
1053 | if (blk->bs) { |
1054 | bdrv_op_block_all(blk->bs, reason); | |
1055 | } | |
4be74634 MA |
1056 | } |
1057 | ||
1058 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1059 | { | |
a46fc9c9 HR |
1060 | if (blk->bs) { |
1061 | bdrv_op_unblock_all(blk->bs, reason); | |
1062 | } | |
4be74634 MA |
1063 | } |
1064 | ||
1065 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1066 | { | |
4981bdec HR |
1067 | if (blk->bs) { |
1068 | return bdrv_get_aio_context(blk->bs); | |
1069 | } else { | |
1070 | return qemu_get_aio_context(); | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1075 | { | |
1076 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1077 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1078 | } |
1079 | ||
1080 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1081 | { | |
a46fc9c9 HR |
1082 | if (blk->bs) { |
1083 | bdrv_set_aio_context(blk->bs, new_context); | |
1084 | } | |
4be74634 MA |
1085 | } |
1086 | ||
2019ba0a HR |
1087 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1088 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1089 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1090 | { | |
a46fc9c9 HR |
1091 | if (blk->bs) { |
1092 | bdrv_add_aio_context_notifier(blk->bs, attached_aio_context, | |
1093 | detach_aio_context, opaque); | |
1094 | } | |
2019ba0a HR |
1095 | } |
1096 | ||
1097 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1098 | void (*attached_aio_context)(AioContext *, | |
1099 | void *), | |
1100 | void (*detach_aio_context)(void *), | |
1101 | void *opaque) | |
1102 | { | |
a46fc9c9 HR |
1103 | if (blk->bs) { |
1104 | bdrv_remove_aio_context_notifier(blk->bs, attached_aio_context, | |
1105 | detach_aio_context, opaque); | |
1106 | } | |
2019ba0a HR |
1107 | } |
1108 | ||
2c28b21f HR |
1109 | void blk_add_close_notifier(BlockBackend *blk, Notifier *notify) |
1110 | { | |
a46fc9c9 HR |
1111 | if (blk->bs) { |
1112 | bdrv_add_close_notifier(blk->bs, notify); | |
1113 | } | |
2c28b21f HR |
1114 | } |
1115 | ||
4be74634 MA |
1116 | void blk_io_plug(BlockBackend *blk) |
1117 | { | |
a46fc9c9 HR |
1118 | if (blk->bs) { |
1119 | bdrv_io_plug(blk->bs); | |
1120 | } | |
4be74634 MA |
1121 | } |
1122 | ||
1123 | void blk_io_unplug(BlockBackend *blk) | |
1124 | { | |
a46fc9c9 HR |
1125 | if (blk->bs) { |
1126 | bdrv_io_unplug(blk->bs); | |
1127 | } | |
4be74634 MA |
1128 | } |
1129 | ||
1130 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1131 | { | |
7f0e9da6 | 1132 | return &blk->stats; |
4be74634 MA |
1133 | } |
1134 | ||
1135 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1136 | BlockCompletionFunc *cb, void *opaque) | |
1137 | { | |
1138 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1139 | } | |
1ef01253 HR |
1140 | |
1141 | int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num, | |
1142 | int nb_sectors, BdrvRequestFlags flags) | |
1143 | { | |
e7f7d676 HR |
1144 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1145 | if (ret < 0) { | |
1146 | return ret; | |
1147 | } | |
1148 | ||
1ef01253 HR |
1149 | return bdrv_co_write_zeroes(blk->bs, sector_num, nb_sectors, flags); |
1150 | } | |
1151 | ||
1152 | int blk_write_compressed(BlockBackend *blk, int64_t sector_num, | |
1153 | const uint8_t *buf, int nb_sectors) | |
1154 | { | |
e7f7d676 HR |
1155 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1156 | if (ret < 0) { | |
1157 | return ret; | |
1158 | } | |
1159 | ||
1ef01253 HR |
1160 | return bdrv_write_compressed(blk->bs, sector_num, buf, nb_sectors); |
1161 | } | |
1162 | ||
1163 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1164 | { | |
c09ba36c HR |
1165 | if (!blk_is_available(blk)) { |
1166 | return -ENOMEDIUM; | |
1167 | } | |
1168 | ||
1ef01253 HR |
1169 | return bdrv_truncate(blk->bs, offset); |
1170 | } | |
1171 | ||
1172 | int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) | |
1173 | { | |
e7f7d676 HR |
1174 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1175 | if (ret < 0) { | |
1176 | return ret; | |
1177 | } | |
1178 | ||
1ef01253 HR |
1179 | return bdrv_discard(blk->bs, sector_num, nb_sectors); |
1180 | } | |
1181 | ||
1182 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1183 | int64_t pos, int size) | |
1184 | { | |
c09ba36c HR |
1185 | if (!blk_is_available(blk)) { |
1186 | return -ENOMEDIUM; | |
1187 | } | |
1188 | ||
1ef01253 HR |
1189 | return bdrv_save_vmstate(blk->bs, buf, pos, size); |
1190 | } | |
1191 | ||
1192 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1193 | { | |
c09ba36c HR |
1194 | if (!blk_is_available(blk)) { |
1195 | return -ENOMEDIUM; | |
1196 | } | |
1197 | ||
1ef01253 HR |
1198 | return bdrv_load_vmstate(blk->bs, buf, pos, size); |
1199 | } | |
f0272c4d ET |
1200 | |
1201 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1202 | { | |
c09ba36c HR |
1203 | if (!blk_is_available(blk)) { |
1204 | return -ENOMEDIUM; | |
1205 | } | |
1206 | ||
f0272c4d ET |
1207 | return bdrv_probe_blocksizes(blk->bs, bsz); |
1208 | } | |
1209 | ||
1210 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1211 | { | |
c09ba36c HR |
1212 | if (!blk_is_available(blk)) { |
1213 | return -ENOMEDIUM; | |
1214 | } | |
1215 | ||
f0272c4d ET |
1216 | return bdrv_probe_geometry(blk->bs, geo); |
1217 | } | |
281d22d8 HR |
1218 | |
1219 | /* | |
1220 | * Updates the BlockBackendRootState object with data from the currently | |
1221 | * attached BlockDriverState. | |
1222 | */ | |
1223 | void blk_update_root_state(BlockBackend *blk) | |
1224 | { | |
1225 | assert(blk->bs); | |
1226 | ||
1227 | blk->root_state.open_flags = blk->bs->open_flags; | |
1228 | blk->root_state.read_only = blk->bs->read_only; | |
1229 | blk->root_state.detect_zeroes = blk->bs->detect_zeroes; | |
1230 | ||
1231 | if (blk->root_state.throttle_group) { | |
1232 | g_free(blk->root_state.throttle_group); | |
1233 | throttle_group_unref(blk->root_state.throttle_state); | |
1234 | } | |
1235 | if (blk->bs->throttle_state) { | |
1236 | const char *name = throttle_group_get_name(blk->bs); | |
1237 | blk->root_state.throttle_group = g_strdup(name); | |
1238 | blk->root_state.throttle_state = throttle_group_incref(name); | |
1239 | } else { | |
1240 | blk->root_state.throttle_group = NULL; | |
1241 | blk->root_state.throttle_state = NULL; | |
1242 | } | |
1243 | } | |
1244 | ||
38cb18f5 HR |
1245 | /* |
1246 | * Applies the information in the root state to the given BlockDriverState. This | |
1247 | * does not include the flags which have to be specified for bdrv_open(), use | |
1248 | * blk_get_open_flags_from_root_state() to inquire them. | |
1249 | */ | |
1250 | void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs) | |
1251 | { | |
1252 | bs->detect_zeroes = blk->root_state.detect_zeroes; | |
1253 | if (blk->root_state.throttle_group) { | |
1254 | bdrv_io_limits_enable(bs, blk->root_state.throttle_group); | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | /* | |
1259 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1260 | * supposed to inherit the root state. | |
1261 | */ | |
1262 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1263 | { | |
1264 | int bs_flags; | |
1265 | ||
1266 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1267 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1268 | ||
1269 | return bs_flags; | |
1270 | } | |
1271 | ||
281d22d8 HR |
1272 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1273 | { | |
1274 | return &blk->root_state; | |
1275 | } |