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Commit | Line | Data |
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26f54e9a MA |
1 | /* |
2 | * QEMU Block backends | |
3 | * | |
60cb2fa7 | 4 | * Copyright (C) 2014-2016 Red Hat, Inc. |
26f54e9a MA |
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 | ||
80c71a24 | 13 | #include "qemu/osdep.h" |
26f54e9a MA |
14 | #include "sysemu/block-backend.h" |
15 | #include "block/block_int.h" | |
373340b2 | 16 | #include "block/blockjob.h" |
281d22d8 | 17 | #include "block/throttle-groups.h" |
18e46a03 | 18 | #include "sysemu/blockdev.h" |
373340b2 | 19 | #include "sysemu/sysemu.h" |
a7f53e26 | 20 | #include "qapi-event.h" |
f348b6d1 | 21 | #include "qemu/id.h" |
a7f53e26 MA |
22 | |
23 | /* Number of coroutines to reserve per attached device model */ | |
24 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 25 | |
1bf1cbc9 KW |
26 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
27 | ||
4981bdec HR |
28 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
29 | ||
26f54e9a MA |
30 | struct BlockBackend { |
31 | char *name; | |
32 | int refcnt; | |
f21d96d0 | 33 | BdrvChild *root; |
26f8b3a8 | 34 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 35 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 36 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 37 | BlockBackendPublic public; |
a7f53e26 MA |
38 | |
39 | void *dev; /* attached device model, if any */ | |
40 | /* TODO change to DeviceState when all users are qdevified */ | |
41 | const BlockDevOps *dev_ops; | |
42 | void *dev_opaque; | |
68e9ec01 HR |
43 | |
44 | /* the block size for which the guest device expects atomicity */ | |
45 | int guest_block_size; | |
7f0e9da6 | 46 | |
281d22d8 HR |
47 | /* If the BDS tree is removed, some of its options are stored here (which |
48 | * can be used to restore those options in the new BDS on insert) */ | |
49 | BlockBackendRootState root_state; | |
50 | ||
bfd18d1e KW |
51 | bool enable_write_cache; |
52 | ||
7f0e9da6 HR |
53 | /* I/O stats (display with "info blockstats"). */ |
54 | BlockAcctStats stats; | |
373340b2 HR |
55 | |
56 | BlockdevOnError on_read_error, on_write_error; | |
57 | bool iostatus_enabled; | |
58 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 59 | |
c10c9d96 KW |
60 | bool allow_write_beyond_eof; |
61 | ||
3301f6c6 | 62 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
26f54e9a MA |
63 | }; |
64 | ||
e7f7d676 HR |
65 | typedef struct BlockBackendAIOCB { |
66 | BlockAIOCB common; | |
67 | QEMUBH *bh; | |
4981bdec | 68 | BlockBackend *blk; |
e7f7d676 HR |
69 | int ret; |
70 | } BlockBackendAIOCB; | |
71 | ||
72 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 73 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
74 | .aiocb_size = sizeof(BlockBackendAIOCB), |
75 | }; | |
76 | ||
8fb3c76c MA |
77 | static void drive_info_del(DriveInfo *dinfo); |
78 | ||
2cf22d6a HR |
79 | /* All BlockBackends */ |
80 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
81 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
82 | ||
9492b0b9 HR |
83 | /* All BlockBackends referenced by the monitor and which are iterated through by |
84 | * blk_next() */ | |
85 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
86 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 87 | |
f21d96d0 KW |
88 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
89 | int parent_flags, QDict *parent_options) | |
90 | { | |
91 | /* We're not supposed to call this function for root nodes */ | |
92 | abort(); | |
93 | } | |
c2066af0 KW |
94 | static void blk_root_drained_begin(BdrvChild *child); |
95 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 KW |
96 | |
97 | static const BdrvChildRole child_root = { | |
c2066af0 KW |
98 | .inherit_options = blk_root_inherit_options, |
99 | ||
100 | .drained_begin = blk_root_drained_begin, | |
101 | .drained_end = blk_root_drained_end, | |
f21d96d0 KW |
102 | }; |
103 | ||
26f54e9a | 104 | /* |
efaa7c4e | 105 | * Create a new BlockBackend with a reference count of one. |
26f54e9a MA |
106 | * Store an error through @errp on failure, unless it's null. |
107 | * Return the new BlockBackend on success, null on failure. | |
108 | */ | |
efaa7c4e | 109 | BlockBackend *blk_new(Error **errp) |
26f54e9a MA |
110 | { |
111 | BlockBackend *blk; | |
112 | ||
26f54e9a | 113 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 114 | blk->refcnt = 1; |
27ccdd52 KW |
115 | qemu_co_queue_init(&blk->public.throttled_reqs[0]); |
116 | qemu_co_queue_init(&blk->public.throttled_reqs[1]); | |
117 | ||
3301f6c6 HR |
118 | notifier_list_init(&blk->remove_bs_notifiers); |
119 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 120 | |
2cf22d6a | 121 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
122 | return blk; |
123 | } | |
124 | ||
7e7d56d9 MA |
125 | /* |
126 | * Create a new BlockBackend with a new BlockDriverState attached. | |
7e7d56d9 MA |
127 | * Otherwise just like blk_new(), which see. |
128 | */ | |
efaa7c4e | 129 | BlockBackend *blk_new_with_bs(Error **errp) |
7e7d56d9 MA |
130 | { |
131 | BlockBackend *blk; | |
132 | BlockDriverState *bs; | |
133 | ||
efaa7c4e | 134 | blk = blk_new(errp); |
7e7d56d9 MA |
135 | if (!blk) { |
136 | return NULL; | |
137 | } | |
138 | ||
7f06d47e | 139 | bs = bdrv_new_root(); |
f21d96d0 | 140 | blk->root = bdrv_root_attach_child(bs, "root", &child_root); |
22aa8b24 | 141 | blk->root->opaque = blk; |
7e7d56d9 MA |
142 | bs->blk = blk; |
143 | return blk; | |
144 | } | |
145 | ||
ca49a4fd HR |
146 | /* |
147 | * Calls blk_new_with_bs() and then calls bdrv_open() on the BlockDriverState. | |
148 | * | |
149 | * Just as with bdrv_open(), after having called this function the reference to | |
150 | * @options belongs to the block layer (even on failure). | |
151 | * | |
152 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
153 | * BDS tree just by specifying the @options QDict (or @reference, | |
154 | * alternatively). At the time of adding this function, this is not possible, | |
155 | * though, so callers of this function have to be able to specify @filename and | |
156 | * @flags. | |
157 | */ | |
efaa7c4e HR |
158 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
159 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
160 | { |
161 | BlockBackend *blk; | |
162 | int ret; | |
163 | ||
efaa7c4e | 164 | blk = blk_new_with_bs(errp); |
ca49a4fd HR |
165 | if (!blk) { |
166 | QDECREF(options); | |
167 | return NULL; | |
168 | } | |
169 | ||
f21d96d0 | 170 | ret = bdrv_open(&blk->root->bs, filename, reference, options, flags, errp); |
ca49a4fd HR |
171 | if (ret < 0) { |
172 | blk_unref(blk); | |
173 | return NULL; | |
174 | } | |
175 | ||
72e775c7 KW |
176 | blk_set_enable_write_cache(blk, true); |
177 | ||
ca49a4fd HR |
178 | return blk; |
179 | } | |
180 | ||
26f54e9a MA |
181 | static void blk_delete(BlockBackend *blk) |
182 | { | |
183 | assert(!blk->refcnt); | |
e5e78550 | 184 | assert(!blk->name); |
a7f53e26 | 185 | assert(!blk->dev); |
f21d96d0 | 186 | if (blk->root) { |
13855c6b | 187 | blk_remove_bs(blk); |
7e7d56d9 | 188 | } |
3301f6c6 HR |
189 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
190 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
281d22d8 HR |
191 | if (blk->root_state.throttle_state) { |
192 | g_free(blk->root_state.throttle_group); | |
193 | throttle_group_unref(blk->root_state.throttle_state); | |
194 | } | |
2cf22d6a | 195 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 196 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 197 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
198 | g_free(blk); |
199 | } | |
200 | ||
8fb3c76c MA |
201 | static void drive_info_del(DriveInfo *dinfo) |
202 | { | |
203 | if (!dinfo) { | |
204 | return; | |
205 | } | |
206 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
207 | g_free(dinfo->serial); |
208 | g_free(dinfo); | |
209 | } | |
210 | ||
f636ae85 AG |
211 | int blk_get_refcnt(BlockBackend *blk) |
212 | { | |
213 | return blk ? blk->refcnt : 0; | |
214 | } | |
215 | ||
26f54e9a MA |
216 | /* |
217 | * Increment @blk's reference count. | |
218 | * @blk must not be null. | |
219 | */ | |
220 | void blk_ref(BlockBackend *blk) | |
221 | { | |
222 | blk->refcnt++; | |
223 | } | |
224 | ||
225 | /* | |
226 | * Decrement @blk's reference count. | |
227 | * If this drops it to zero, destroy @blk. | |
228 | * For convenience, do nothing if @blk is null. | |
229 | */ | |
230 | void blk_unref(BlockBackend *blk) | |
231 | { | |
232 | if (blk) { | |
233 | assert(blk->refcnt > 0); | |
234 | if (!--blk->refcnt) { | |
235 | blk_delete(blk); | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
2cf22d6a HR |
240 | /* |
241 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
242 | * ones which are hidden (i.e. are not referenced by the monitor). | |
243 | */ | |
244 | static BlockBackend *blk_all_next(BlockBackend *blk) | |
245 | { | |
246 | return blk ? QTAILQ_NEXT(blk, link) | |
247 | : QTAILQ_FIRST(&block_backends); | |
248 | } | |
249 | ||
d8da3cef HR |
250 | void blk_remove_all_bs(void) |
251 | { | |
74d1b8fc | 252 | BlockBackend *blk = NULL; |
d8da3cef | 253 | |
2cf22d6a | 254 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
255 | AioContext *ctx = blk_get_aio_context(blk); |
256 | ||
257 | aio_context_acquire(ctx); | |
f21d96d0 | 258 | if (blk->root) { |
d8da3cef HR |
259 | blk_remove_bs(blk); |
260 | } | |
261 | aio_context_release(ctx); | |
262 | } | |
263 | } | |
264 | ||
26f54e9a | 265 | /* |
9492b0b9 | 266 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
267 | * If @blk is null, return the first one. |
268 | * Else, return @blk's next sibling, which may be null. | |
269 | * | |
270 | * To iterate over all BlockBackends, do | |
271 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
272 | * ... | |
273 | * } | |
274 | */ | |
275 | BlockBackend *blk_next(BlockBackend *blk) | |
276 | { | |
9492b0b9 HR |
277 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
278 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
279 | } |
280 | ||
981f4f57 HR |
281 | /* |
282 | * Iterates over all BlockDriverStates which are attached to a BlockBackend. | |
283 | * This function is for use by bdrv_next(). | |
284 | * | |
285 | * @bs must be NULL or a BDS that is attached to a BB. | |
286 | */ | |
287 | BlockDriverState *blk_next_root_bs(BlockDriverState *bs) | |
288 | { | |
289 | BlockBackend *blk; | |
290 | ||
291 | if (bs) { | |
292 | assert(bs->blk); | |
293 | blk = bs->blk; | |
294 | } else { | |
295 | blk = NULL; | |
296 | } | |
297 | ||
298 | do { | |
299 | blk = blk_all_next(blk); | |
f21d96d0 | 300 | } while (blk && !blk->root); |
981f4f57 | 301 | |
f21d96d0 | 302 | return blk ? blk->root->bs : NULL; |
981f4f57 HR |
303 | } |
304 | ||
e5e78550 HR |
305 | /* |
306 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
307 | * the given @name acting as the handle for the monitor. | |
308 | * Strictly for use by blockdev.c. | |
309 | * | |
310 | * @name must not be null or empty. | |
311 | * | |
312 | * Returns true on success and false on failure. In the latter case, an Error | |
313 | * object is returned through @errp. | |
314 | */ | |
315 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
316 | { | |
317 | assert(!blk->name); | |
318 | assert(name && name[0]); | |
319 | ||
320 | if (!id_wellformed(name)) { | |
321 | error_setg(errp, "Invalid device name"); | |
322 | return false; | |
323 | } | |
324 | if (blk_by_name(name)) { | |
325 | error_setg(errp, "Device with id '%s' already exists", name); | |
326 | return false; | |
327 | } | |
328 | if (bdrv_find_node(name)) { | |
329 | error_setg(errp, | |
330 | "Device name '%s' conflicts with an existing node name", | |
331 | name); | |
332 | return false; | |
333 | } | |
334 | ||
335 | blk->name = g_strdup(name); | |
336 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
337 | return true; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
342 | * Strictly for use by blockdev.c. | |
343 | */ | |
344 | void monitor_remove_blk(BlockBackend *blk) | |
345 | { | |
346 | if (!blk->name) { | |
347 | return; | |
348 | } | |
349 | ||
350 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
351 | g_free(blk->name); | |
352 | blk->name = NULL; | |
353 | } | |
354 | ||
26f54e9a | 355 | /* |
7e7d56d9 | 356 | * Return @blk's name, a non-null string. |
e5e78550 | 357 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a MA |
358 | */ |
359 | const char *blk_name(BlockBackend *blk) | |
360 | { | |
e5e78550 | 361 | return blk->name ?: ""; |
26f54e9a MA |
362 | } |
363 | ||
364 | /* | |
365 | * Return the BlockBackend with name @name if it exists, else null. | |
366 | * @name must not be null. | |
367 | */ | |
368 | BlockBackend *blk_by_name(const char *name) | |
369 | { | |
74d1b8fc | 370 | BlockBackend *blk = NULL; |
26f54e9a MA |
371 | |
372 | assert(name); | |
74d1b8fc | 373 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
374 | if (!strcmp(name, blk->name)) { |
375 | return blk; | |
376 | } | |
377 | } | |
378 | return NULL; | |
379 | } | |
7e7d56d9 MA |
380 | |
381 | /* | |
382 | * Return the BlockDriverState attached to @blk if any, else null. | |
383 | */ | |
384 | BlockDriverState *blk_bs(BlockBackend *blk) | |
385 | { | |
f21d96d0 | 386 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
387 | } |
388 | ||
18e46a03 MA |
389 | /* |
390 | * Return @blk's DriveInfo if any, else null. | |
391 | */ | |
392 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
393 | { | |
394 | return blk->legacy_dinfo; | |
395 | } | |
396 | ||
397 | /* | |
398 | * Set @blk's DriveInfo to @dinfo, and return it. | |
399 | * @blk must not have a DriveInfo set already. | |
400 | * No other BlockBackend may have the same DriveInfo set. | |
401 | */ | |
402 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
403 | { | |
404 | assert(!blk->legacy_dinfo); | |
405 | return blk->legacy_dinfo = dinfo; | |
406 | } | |
407 | ||
408 | /* | |
409 | * Return the BlockBackend with DriveInfo @dinfo. | |
410 | * It must exist. | |
411 | */ | |
412 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
413 | { | |
74d1b8fc | 414 | BlockBackend *blk = NULL; |
18e46a03 | 415 | |
74d1b8fc | 416 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
417 | if (blk->legacy_dinfo == dinfo) { |
418 | return blk; | |
419 | } | |
420 | } | |
421 | abort(); | |
422 | } | |
423 | ||
f2cd875d KW |
424 | /* |
425 | * Returns a pointer to the publicly accessible fields of @blk. | |
426 | */ | |
427 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
428 | { | |
429 | return &blk->public; | |
430 | } | |
431 | ||
432 | /* | |
433 | * Returns a BlockBackend given the associated @public fields. | |
434 | */ | |
435 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
436 | { | |
437 | return container_of(public, BlockBackend, public); | |
438 | } | |
439 | ||
1c95f7e1 HR |
440 | /* |
441 | * Disassociates the currently associated BlockDriverState from @blk. | |
442 | */ | |
443 | void blk_remove_bs(BlockBackend *blk) | |
444 | { | |
f21d96d0 | 445 | assert(blk->root->bs->blk == blk); |
13855c6b | 446 | |
3301f6c6 HR |
447 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
448 | ||
1c95f7e1 | 449 | blk_update_root_state(blk); |
27ccdd52 | 450 | if (blk->public.throttle_state) { |
97148076 | 451 | blk_io_limits_disable(blk); |
a5614993 | 452 | } |
1c95f7e1 | 453 | |
f21d96d0 KW |
454 | blk->root->bs->blk = NULL; |
455 | bdrv_root_unref_child(blk->root); | |
456 | blk->root = NULL; | |
1c95f7e1 HR |
457 | } |
458 | ||
0c3c36d6 HR |
459 | /* |
460 | * Associates a new BlockDriverState with @blk. | |
461 | */ | |
462 | void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) | |
463 | { | |
f21d96d0 | 464 | assert(!blk->root && !bs->blk); |
0c3c36d6 | 465 | bdrv_ref(bs); |
f21d96d0 | 466 | blk->root = bdrv_root_attach_child(bs, "root", &child_root); |
22aa8b24 | 467 | blk->root->opaque = blk; |
0c3c36d6 | 468 | bs->blk = blk; |
3301f6c6 HR |
469 | |
470 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
0c3c36d6 HR |
471 | } |
472 | ||
a7f53e26 MA |
473 | /* |
474 | * Attach device model @dev to @blk. | |
475 | * Return 0 on success, -EBUSY when a device model is attached already. | |
476 | */ | |
4be74634 | 477 | int blk_attach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 478 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 479 | { |
a7f53e26 MA |
480 | if (blk->dev) { |
481 | return -EBUSY; | |
482 | } | |
84ebe375 | 483 | blk_ref(blk); |
a7f53e26 | 484 | blk->dev = dev; |
373340b2 | 485 | blk_iostatus_reset(blk); |
a7f53e26 | 486 | return 0; |
4be74634 MA |
487 | } |
488 | ||
a7f53e26 MA |
489 | /* |
490 | * Attach device model @dev to @blk. | |
491 | * @blk must not have a device model attached already. | |
492 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
493 | */ | |
4be74634 MA |
494 | void blk_attach_dev_nofail(BlockBackend *blk, void *dev) |
495 | { | |
a7f53e26 MA |
496 | if (blk_attach_dev(blk, dev) < 0) { |
497 | abort(); | |
498 | } | |
4be74634 MA |
499 | } |
500 | ||
a7f53e26 MA |
501 | /* |
502 | * Detach device model @dev from @blk. | |
503 | * @dev must be currently attached to @blk. | |
504 | */ | |
4be74634 | 505 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 506 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 507 | { |
a7f53e26 MA |
508 | assert(blk->dev == dev); |
509 | blk->dev = NULL; | |
510 | blk->dev_ops = NULL; | |
511 | blk->dev_opaque = NULL; | |
68e9ec01 | 512 | blk->guest_block_size = 512; |
84ebe375 | 513 | blk_unref(blk); |
4be74634 MA |
514 | } |
515 | ||
a7f53e26 MA |
516 | /* |
517 | * Return the device model attached to @blk if any, else null. | |
518 | */ | |
4be74634 | 519 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
520 | /* TODO change to return DeviceState * when all users are qdevified */ |
521 | { | |
522 | return blk->dev; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Set @blk's device model callbacks to @ops. | |
527 | * @opaque is the opaque argument to pass to the callbacks. | |
528 | * This is for use by device models. | |
529 | */ | |
530 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
531 | void *opaque) | |
532 | { | |
533 | blk->dev_ops = ops; | |
534 | blk->dev_opaque = opaque; | |
535 | } | |
536 | ||
537 | /* | |
538 | * Notify @blk's attached device model of media change. | |
539 | * If @load is true, notify of media load. | |
540 | * Else, notify of media eject. | |
541 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
542 | */ | |
543 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
544 | { | |
545 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 546 | bool tray_was_open, tray_is_open; |
a7f53e26 | 547 | |
f1f57066 | 548 | tray_was_open = blk_dev_is_tray_open(blk); |
a7f53e26 | 549 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); |
f1f57066 HR |
550 | tray_is_open = blk_dev_is_tray_open(blk); |
551 | ||
552 | if (tray_was_open != tray_is_open) { | |
553 | qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open, | |
554 | &error_abort); | |
a7f53e26 MA |
555 | } |
556 | } | |
557 | } | |
558 | ||
559 | /* | |
560 | * Does @blk's attached device model have removable media? | |
561 | * %true if no device model is attached. | |
562 | */ | |
563 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
564 | { | |
565 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
566 | } | |
567 | ||
8f3a73bc HR |
568 | /* |
569 | * Does @blk's attached device model have a tray? | |
570 | */ | |
571 | bool blk_dev_has_tray(BlockBackend *blk) | |
572 | { | |
573 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
574 | } | |
575 | ||
a7f53e26 MA |
576 | /* |
577 | * Notify @blk's attached device model of a media eject request. | |
578 | * If @force is true, the medium is about to be yanked out forcefully. | |
579 | */ | |
580 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 581 | { |
a7f53e26 MA |
582 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
583 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
584 | } | |
4be74634 MA |
585 | } |
586 | ||
a7f53e26 MA |
587 | /* |
588 | * Does @blk's attached device model have a tray, and is it open? | |
589 | */ | |
590 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 591 | { |
8f3a73bc | 592 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
593 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
594 | } | |
595 | return false; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Does @blk's attached device model have the medium locked? | |
600 | * %false if the device model has no such lock. | |
601 | */ | |
602 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
603 | { | |
604 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
605 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
606 | } | |
607 | return false; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Notify @blk's attached device model of a backend size change. | |
612 | */ | |
613 | void blk_dev_resize_cb(BlockBackend *blk) | |
614 | { | |
615 | if (blk->dev_ops && blk->dev_ops->resize_cb) { | |
616 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
617 | } | |
618 | } | |
619 | ||
620 | void blk_iostatus_enable(BlockBackend *blk) | |
621 | { | |
373340b2 HR |
622 | blk->iostatus_enabled = true; |
623 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
624 | } | |
625 | ||
626 | /* The I/O status is only enabled if the drive explicitly | |
627 | * enables it _and_ the VM is configured to stop on errors */ | |
628 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
629 | { | |
630 | return (blk->iostatus_enabled && | |
631 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
632 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
633 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
634 | } | |
635 | ||
636 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
637 | { | |
638 | return blk->iostatus; | |
639 | } | |
640 | ||
641 | void blk_iostatus_disable(BlockBackend *blk) | |
642 | { | |
643 | blk->iostatus_enabled = false; | |
644 | } | |
645 | ||
646 | void blk_iostatus_reset(BlockBackend *blk) | |
647 | { | |
648 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 649 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 650 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
651 | if (bs && bs->job) { |
652 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
653 | } |
654 | } | |
655 | } | |
656 | ||
657 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
658 | { | |
659 | assert(blk_iostatus_is_enabled(blk)); | |
660 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
661 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
662 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
663 | } | |
4be74634 MA |
664 | } |
665 | ||
c10c9d96 KW |
666 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
667 | { | |
668 | blk->allow_write_beyond_eof = allow; | |
669 | } | |
670 | ||
e7f7d676 HR |
671 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
672 | size_t size) | |
673 | { | |
674 | int64_t len; | |
675 | ||
676 | if (size > INT_MAX) { | |
677 | return -EIO; | |
678 | } | |
679 | ||
c09ba36c | 680 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
681 | return -ENOMEDIUM; |
682 | } | |
683 | ||
e7f7d676 HR |
684 | if (offset < 0) { |
685 | return -EIO; | |
686 | } | |
687 | ||
c10c9d96 KW |
688 | if (!blk->allow_write_beyond_eof) { |
689 | len = blk_getlength(blk); | |
690 | if (len < 0) { | |
691 | return len; | |
692 | } | |
693 | ||
694 | if (offset > len || len - offset < size) { | |
695 | return -EIO; | |
696 | } | |
e7f7d676 HR |
697 | } |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | static int blk_check_request(BlockBackend *blk, int64_t sector_num, | |
703 | int nb_sectors) | |
704 | { | |
705 | if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) { | |
706 | return -EIO; | |
707 | } | |
708 | ||
709 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { | |
710 | return -EIO; | |
711 | } | |
712 | ||
713 | return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE, | |
714 | nb_sectors * BDRV_SECTOR_SIZE); | |
715 | } | |
716 | ||
1bf1cbc9 KW |
717 | static int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
718 | unsigned int bytes, QEMUIOVector *qiov, | |
719 | BdrvRequestFlags flags) | |
4be74634 | 720 | { |
1bf1cbc9 | 721 | int ret = blk_check_byte_request(blk, offset, bytes); |
e7f7d676 HR |
722 | if (ret < 0) { |
723 | return ret; | |
724 | } | |
725 | ||
441565b2 KW |
726 | /* throttling disk I/O */ |
727 | if (blk->public.throttle_state) { | |
728 | throttle_group_co_io_limits_intercept(blk, bytes, false); | |
729 | } | |
730 | ||
cab3a356 | 731 | return bdrv_co_preadv(blk_bs(blk), offset, bytes, qiov, flags); |
1bf1cbc9 KW |
732 | } |
733 | ||
a8823a3b KW |
734 | static int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
735 | unsigned int bytes, QEMUIOVector *qiov, | |
736 | BdrvRequestFlags flags) | |
737 | { | |
bfd18d1e KW |
738 | int ret; |
739 | ||
740 | ret = blk_check_byte_request(blk, offset, bytes); | |
a8823a3b KW |
741 | if (ret < 0) { |
742 | return ret; | |
743 | } | |
744 | ||
441565b2 KW |
745 | /* throttling disk I/O */ |
746 | if (blk->public.throttle_state) { | |
747 | throttle_group_co_io_limits_intercept(blk, bytes, true); | |
748 | } | |
749 | ||
bfd18d1e KW |
750 | if (!blk->enable_write_cache) { |
751 | flags |= BDRV_REQ_FUA; | |
752 | } | |
753 | ||
cab3a356 | 754 | return bdrv_co_pwritev(blk_bs(blk), offset, bytes, qiov, flags); |
a8823a3b KW |
755 | } |
756 | ||
1bf1cbc9 KW |
757 | typedef struct BlkRwCo { |
758 | BlockBackend *blk; | |
759 | int64_t offset; | |
760 | QEMUIOVector *qiov; | |
761 | int ret; | |
762 | BdrvRequestFlags flags; | |
763 | } BlkRwCo; | |
764 | ||
765 | static void blk_read_entry(void *opaque) | |
766 | { | |
767 | BlkRwCo *rwco = opaque; | |
768 | ||
769 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
770 | rwco->qiov, rwco->flags); | |
771 | } | |
772 | ||
a8823a3b KW |
773 | static void blk_write_entry(void *opaque) |
774 | { | |
775 | BlkRwCo *rwco = opaque; | |
776 | ||
777 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
778 | rwco->qiov, rwco->flags); | |
779 | } | |
780 | ||
a55d3fba KW |
781 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
782 | int64_t bytes, CoroutineEntry co_entry, | |
783 | BdrvRequestFlags flags) | |
1bf1cbc9 KW |
784 | { |
785 | AioContext *aio_context; | |
786 | QEMUIOVector qiov; | |
787 | struct iovec iov; | |
788 | Coroutine *co; | |
789 | BlkRwCo rwco; | |
790 | ||
1bf1cbc9 KW |
791 | iov = (struct iovec) { |
792 | .iov_base = buf, | |
a55d3fba | 793 | .iov_len = bytes, |
1bf1cbc9 KW |
794 | }; |
795 | qemu_iovec_init_external(&qiov, &iov, 1); | |
796 | ||
797 | rwco = (BlkRwCo) { | |
798 | .blk = blk, | |
a55d3fba | 799 | .offset = offset, |
1bf1cbc9 | 800 | .qiov = &qiov, |
fc1453cd | 801 | .flags = flags, |
1bf1cbc9 KW |
802 | .ret = NOT_DONE, |
803 | }; | |
804 | ||
a8823a3b | 805 | co = qemu_coroutine_create(co_entry); |
1bf1cbc9 KW |
806 | qemu_coroutine_enter(co, &rwco); |
807 | ||
808 | aio_context = blk_get_aio_context(blk); | |
809 | while (rwco.ret == NOT_DONE) { | |
810 | aio_poll(aio_context, true); | |
811 | } | |
812 | ||
813 | return rwco.ret; | |
4be74634 MA |
814 | } |
815 | ||
b7d17f9f EB |
816 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
817 | int count) | |
4be74634 | 818 | { |
5bd51196 KW |
819 | int ret; |
820 | ||
b7d17f9f | 821 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
822 | if (ret < 0) { |
823 | return ret; | |
824 | } | |
825 | ||
c2066af0 | 826 | blk_root_drained_begin(blk->root); |
b7d17f9f | 827 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 828 | blk_root_drained_end(blk->root); |
5bd51196 | 829 | return ret; |
4be74634 MA |
830 | } |
831 | ||
983a1600 EB |
832 | int blk_write_zeroes(BlockBackend *blk, int64_t offset, |
833 | int count, BdrvRequestFlags flags) | |
0df89e8e | 834 | { |
983a1600 EB |
835 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
836 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
837 | } |
838 | ||
e7f7d676 HR |
839 | static void error_callback_bh(void *opaque) |
840 | { | |
841 | struct BlockBackendAIOCB *acb = opaque; | |
842 | qemu_bh_delete(acb->bh); | |
843 | acb->common.cb(acb->common.opaque, acb->ret); | |
844 | qemu_aio_unref(acb); | |
845 | } | |
846 | ||
ca78ecfa PL |
847 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
848 | BlockCompletionFunc *cb, | |
849 | void *opaque, int ret) | |
e7f7d676 HR |
850 | { |
851 | struct BlockBackendAIOCB *acb; | |
852 | QEMUBH *bh; | |
853 | ||
854 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); | |
4981bdec | 855 | acb->blk = blk; |
e7f7d676 HR |
856 | acb->ret = ret; |
857 | ||
858 | bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb); | |
859 | acb->bh = bh; | |
860 | qemu_bh_schedule(bh); | |
861 | ||
862 | return &acb->common; | |
863 | } | |
864 | ||
57d6a428 KW |
865 | typedef struct BlkAioEmAIOCB { |
866 | BlockAIOCB common; | |
867 | BlkRwCo rwco; | |
7fa84cd8 | 868 | int bytes; |
57d6a428 KW |
869 | bool has_returned; |
870 | QEMUBH* bh; | |
871 | } BlkAioEmAIOCB; | |
872 | ||
873 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
874 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
875 | }; | |
876 | ||
877 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
878 | { | |
879 | if (acb->bh) { | |
880 | assert(acb->has_returned); | |
881 | qemu_bh_delete(acb->bh); | |
882 | } | |
883 | if (acb->has_returned) { | |
884 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
885 | qemu_aio_unref(acb); | |
886 | } | |
887 | } | |
888 | ||
889 | static void blk_aio_complete_bh(void *opaque) | |
890 | { | |
891 | blk_aio_complete(opaque); | |
892 | } | |
893 | ||
7fa84cd8 | 894 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
895 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
896 | BdrvRequestFlags flags, | |
897 | BlockCompletionFunc *cb, void *opaque) | |
898 | { | |
899 | BlkAioEmAIOCB *acb; | |
900 | Coroutine *co; | |
901 | ||
902 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
903 | acb->rwco = (BlkRwCo) { | |
904 | .blk = blk, | |
905 | .offset = offset, | |
906 | .qiov = qiov, | |
907 | .flags = flags, | |
908 | .ret = NOT_DONE, | |
909 | }; | |
7fa84cd8 | 910 | acb->bytes = bytes; |
57d6a428 KW |
911 | acb->bh = NULL; |
912 | acb->has_returned = false; | |
913 | ||
914 | co = qemu_coroutine_create(co_entry); | |
915 | qemu_coroutine_enter(co, acb); | |
916 | ||
917 | acb->has_returned = true; | |
918 | if (acb->rwco.ret != NOT_DONE) { | |
919 | acb->bh = aio_bh_new(blk_get_aio_context(blk), blk_aio_complete_bh, acb); | |
920 | qemu_bh_schedule(acb->bh); | |
921 | } | |
922 | ||
923 | return &acb->common; | |
924 | } | |
925 | ||
926 | static void blk_aio_read_entry(void *opaque) | |
927 | { | |
928 | BlkAioEmAIOCB *acb = opaque; | |
929 | BlkRwCo *rwco = &acb->rwco; | |
930 | ||
7fa84cd8 KW |
931 | assert(rwco->qiov->size == acb->bytes); |
932 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
933 | rwco->qiov, rwco->flags); |
934 | blk_aio_complete(acb); | |
935 | } | |
936 | ||
937 | static void blk_aio_write_entry(void *opaque) | |
938 | { | |
939 | BlkAioEmAIOCB *acb = opaque; | |
940 | BlkRwCo *rwco = &acb->rwco; | |
941 | ||
7fa84cd8 KW |
942 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
943 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
944 | rwco->qiov, rwco->flags); |
945 | blk_aio_complete(acb); | |
946 | } | |
947 | ||
983a1600 EB |
948 | BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t offset, |
949 | int count, BdrvRequestFlags flags, | |
4be74634 MA |
950 | BlockCompletionFunc *cb, void *opaque) |
951 | { | |
983a1600 EB |
952 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
953 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
954 | } |
955 | ||
956 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
957 | { | |
a55d3fba | 958 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
959 | if (ret < 0) { |
960 | return ret; | |
961 | } | |
a55d3fba | 962 | return count; |
4be74634 MA |
963 | } |
964 | ||
8341f00d EB |
965 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
966 | BdrvRequestFlags flags) | |
4be74634 | 967 | { |
8341f00d EB |
968 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
969 | flags); | |
e7f7d676 HR |
970 | if (ret < 0) { |
971 | return ret; | |
972 | } | |
a55d3fba | 973 | return count; |
4be74634 MA |
974 | } |
975 | ||
976 | int64_t blk_getlength(BlockBackend *blk) | |
977 | { | |
c09ba36c HR |
978 | if (!blk_is_available(blk)) { |
979 | return -ENOMEDIUM; | |
980 | } | |
981 | ||
f21d96d0 | 982 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
983 | } |
984 | ||
985 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
986 | { | |
f21d96d0 | 987 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
988 | *nb_sectors_ptr = 0; |
989 | } else { | |
f21d96d0 | 990 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 991 | } |
4be74634 MA |
992 | } |
993 | ||
1ef01253 HR |
994 | int64_t blk_nb_sectors(BlockBackend *blk) |
995 | { | |
c09ba36c HR |
996 | if (!blk_is_available(blk)) { |
997 | return -ENOMEDIUM; | |
998 | } | |
999 | ||
f21d96d0 | 1000 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1001 | } |
1002 | ||
60cb2fa7 EB |
1003 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1004 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1005 | BlockCompletionFunc *cb, void *opaque) | |
1006 | { | |
1007 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1008 | blk_aio_read_entry, flags, cb, opaque); | |
1009 | } | |
1010 | ||
60cb2fa7 EB |
1011 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1012 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1013 | BlockCompletionFunc *cb, void *opaque) | |
1014 | { | |
1015 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1016 | blk_aio_write_entry, flags, cb, opaque); | |
1017 | } | |
1018 | ||
4be74634 MA |
1019 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1020 | BlockCompletionFunc *cb, void *opaque) | |
1021 | { | |
c09ba36c | 1022 | if (!blk_is_available(blk)) { |
ca78ecfa | 1023 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1024 | } |
1025 | ||
f21d96d0 | 1026 | return bdrv_aio_flush(blk_bs(blk), cb, opaque); |
4be74634 MA |
1027 | } |
1028 | ||
1029 | BlockAIOCB *blk_aio_discard(BlockBackend *blk, | |
1030 | int64_t sector_num, int nb_sectors, | |
1031 | BlockCompletionFunc *cb, void *opaque) | |
1032 | { | |
e7f7d676 HR |
1033 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1034 | if (ret < 0) { | |
ca78ecfa | 1035 | return blk_abort_aio_request(blk, cb, opaque, ret); |
e7f7d676 HR |
1036 | } |
1037 | ||
f21d96d0 | 1038 | return bdrv_aio_discard(blk_bs(blk), sector_num, nb_sectors, cb, opaque); |
4be74634 MA |
1039 | } |
1040 | ||
1041 | void blk_aio_cancel(BlockAIOCB *acb) | |
1042 | { | |
1043 | bdrv_aio_cancel(acb); | |
1044 | } | |
1045 | ||
1046 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1047 | { | |
1048 | bdrv_aio_cancel_async(acb); | |
1049 | } | |
1050 | ||
1051 | int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs) | |
1052 | { | |
e7f7d676 HR |
1053 | int i, ret; |
1054 | ||
1055 | for (i = 0; i < num_reqs; i++) { | |
1056 | ret = blk_check_request(blk, reqs[i].sector, reqs[i].nb_sectors); | |
1057 | if (ret < 0) { | |
1058 | return ret; | |
1059 | } | |
1060 | } | |
1061 | ||
f21d96d0 | 1062 | return bdrv_aio_multiwrite(blk_bs(blk), reqs, num_reqs); |
4be74634 MA |
1063 | } |
1064 | ||
1065 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1066 | { | |
c09ba36c HR |
1067 | if (!blk_is_available(blk)) { |
1068 | return -ENOMEDIUM; | |
1069 | } | |
1070 | ||
f21d96d0 | 1071 | return bdrv_ioctl(blk_bs(blk), req, buf); |
4be74634 MA |
1072 | } |
1073 | ||
1074 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1075 | BlockCompletionFunc *cb, void *opaque) | |
1076 | { | |
c09ba36c | 1077 | if (!blk_is_available(blk)) { |
ca78ecfa | 1078 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1079 | } |
1080 | ||
f21d96d0 | 1081 | return bdrv_aio_ioctl(blk_bs(blk), req, buf, cb, opaque); |
4be74634 MA |
1082 | } |
1083 | ||
2bb0dce7 HR |
1084 | int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) |
1085 | { | |
e7f7d676 HR |
1086 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1087 | if (ret < 0) { | |
1088 | return ret; | |
1089 | } | |
1090 | ||
f21d96d0 | 1091 | return bdrv_co_discard(blk_bs(blk), sector_num, nb_sectors); |
2bb0dce7 HR |
1092 | } |
1093 | ||
1094 | int blk_co_flush(BlockBackend *blk) | |
1095 | { | |
c09ba36c HR |
1096 | if (!blk_is_available(blk)) { |
1097 | return -ENOMEDIUM; | |
1098 | } | |
1099 | ||
f21d96d0 | 1100 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1101 | } |
1102 | ||
4be74634 MA |
1103 | int blk_flush(BlockBackend *blk) |
1104 | { | |
c09ba36c HR |
1105 | if (!blk_is_available(blk)) { |
1106 | return -ENOMEDIUM; | |
1107 | } | |
1108 | ||
f21d96d0 | 1109 | return bdrv_flush(blk_bs(blk)); |
4be74634 MA |
1110 | } |
1111 | ||
97b0385a AY |
1112 | void blk_drain(BlockBackend *blk) |
1113 | { | |
f21d96d0 KW |
1114 | if (blk_bs(blk)) { |
1115 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1116 | } |
97b0385a AY |
1117 | } |
1118 | ||
4be74634 MA |
1119 | void blk_drain_all(void) |
1120 | { | |
1121 | bdrv_drain_all(); | |
1122 | } | |
1123 | ||
373340b2 HR |
1124 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1125 | BlockdevOnError on_write_error) | |
1126 | { | |
1127 | blk->on_read_error = on_read_error; | |
1128 | blk->on_write_error = on_write_error; | |
1129 | } | |
1130 | ||
4be74634 MA |
1131 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1132 | { | |
373340b2 | 1133 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1134 | } |
1135 | ||
1136 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1137 | int error) | |
1138 | { | |
373340b2 HR |
1139 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1140 | ||
1141 | switch (on_err) { | |
1142 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1143 | return (error == ENOSPC) ? | |
1144 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1145 | case BLOCKDEV_ON_ERROR_STOP: | |
1146 | return BLOCK_ERROR_ACTION_STOP; | |
1147 | case BLOCKDEV_ON_ERROR_REPORT: | |
1148 | return BLOCK_ERROR_ACTION_REPORT; | |
1149 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1150 | return BLOCK_ERROR_ACTION_IGNORE; | |
1151 | default: | |
1152 | abort(); | |
1153 | } | |
4be74634 MA |
1154 | } |
1155 | ||
373340b2 HR |
1156 | static void send_qmp_error_event(BlockBackend *blk, |
1157 | BlockErrorAction action, | |
1158 | bool is_read, int error) | |
1159 | { | |
1160 | IoOperationType optype; | |
1161 | ||
1162 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
1163 | qapi_event_send_block_io_error(blk_name(blk), optype, action, | |
1164 | blk_iostatus_is_enabled(blk), | |
1165 | error == ENOSPC, strerror(error), | |
1166 | &error_abort); | |
1167 | } | |
1168 | ||
1169 | /* This is done by device models because, while the block layer knows | |
1170 | * about the error, it does not know whether an operation comes from | |
1171 | * the device or the block layer (from a job, for example). | |
1172 | */ | |
4be74634 MA |
1173 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1174 | bool is_read, int error) | |
1175 | { | |
373340b2 HR |
1176 | assert(error >= 0); |
1177 | ||
1178 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1179 | /* First set the iostatus, so that "info block" returns an iostatus | |
1180 | * that matches the events raised so far (an additional error iostatus | |
1181 | * is fine, but not a lost one). | |
1182 | */ | |
1183 | blk_iostatus_set_err(blk, error); | |
1184 | ||
1185 | /* Then raise the request to stop the VM and the event. | |
1186 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1187 | * it ensures that the STOP event always comes after the | |
1188 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1189 | * can observe the STOP event and do a "cont" before the STOP | |
1190 | * event is issued, the VM will not stop. In this case, vm_start() | |
1191 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1192 | */ | |
1193 | qemu_system_vmstop_request_prepare(); | |
1194 | send_qmp_error_event(blk, action, is_read, error); | |
1195 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1196 | } else { | |
1197 | send_qmp_error_event(blk, action, is_read, error); | |
1198 | } | |
4be74634 MA |
1199 | } |
1200 | ||
1201 | int blk_is_read_only(BlockBackend *blk) | |
1202 | { | |
f21d96d0 KW |
1203 | BlockDriverState *bs = blk_bs(blk); |
1204 | ||
1205 | if (bs) { | |
1206 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1207 | } else { |
1208 | return blk->root_state.read_only; | |
1209 | } | |
4be74634 MA |
1210 | } |
1211 | ||
1212 | int blk_is_sg(BlockBackend *blk) | |
1213 | { | |
f21d96d0 KW |
1214 | BlockDriverState *bs = blk_bs(blk); |
1215 | ||
1216 | if (!bs) { | |
a46fc9c9 HR |
1217 | return 0; |
1218 | } | |
1219 | ||
f21d96d0 | 1220 | return bdrv_is_sg(bs); |
4be74634 MA |
1221 | } |
1222 | ||
1223 | int blk_enable_write_cache(BlockBackend *blk) | |
1224 | { | |
bfd18d1e | 1225 | return blk->enable_write_cache; |
4be74634 MA |
1226 | } |
1227 | ||
1228 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1229 | { | |
bfd18d1e | 1230 | blk->enable_write_cache = wce; |
4be74634 MA |
1231 | } |
1232 | ||
2bb0dce7 HR |
1233 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1234 | { | |
f21d96d0 KW |
1235 | BlockDriverState *bs = blk_bs(blk); |
1236 | ||
1237 | if (!bs) { | |
c09ba36c HR |
1238 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1239 | return; | |
1240 | } | |
1241 | ||
f21d96d0 | 1242 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1243 | } |
1244 | ||
e031f750 | 1245 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1246 | { |
f21d96d0 KW |
1247 | BlockDriverState *bs = blk_bs(blk); |
1248 | ||
1249 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1250 | } |
1251 | ||
1252 | bool blk_is_available(BlockBackend *blk) | |
1253 | { | |
1254 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1255 | } |
1256 | ||
1257 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1258 | { | |
f21d96d0 KW |
1259 | BlockDriverState *bs = blk_bs(blk); |
1260 | ||
1261 | if (bs) { | |
1262 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1263 | } |
4be74634 MA |
1264 | } |
1265 | ||
1266 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1267 | { | |
f21d96d0 KW |
1268 | BlockDriverState *bs = blk_bs(blk); |
1269 | ||
1270 | if (bs) { | |
1271 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1272 | } |
4be74634 MA |
1273 | } |
1274 | ||
1275 | int blk_get_flags(BlockBackend *blk) | |
1276 | { | |
f21d96d0 KW |
1277 | BlockDriverState *bs = blk_bs(blk); |
1278 | ||
1279 | if (bs) { | |
1280 | return bdrv_get_flags(bs); | |
061959e8 HR |
1281 | } else { |
1282 | return blk->root_state.open_flags; | |
1283 | } | |
4be74634 MA |
1284 | } |
1285 | ||
454057b7 PL |
1286 | int blk_get_max_transfer_length(BlockBackend *blk) |
1287 | { | |
f21d96d0 KW |
1288 | BlockDriverState *bs = blk_bs(blk); |
1289 | ||
1290 | if (bs) { | |
1291 | return bs->bl.max_transfer_length; | |
a46fc9c9 HR |
1292 | } else { |
1293 | return 0; | |
1294 | } | |
454057b7 PL |
1295 | } |
1296 | ||
648296e0 SH |
1297 | int blk_get_max_iov(BlockBackend *blk) |
1298 | { | |
f21d96d0 | 1299 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1300 | } |
1301 | ||
4be74634 MA |
1302 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1303 | { | |
68e9ec01 | 1304 | blk->guest_block_size = align; |
4be74634 MA |
1305 | } |
1306 | ||
f1c17521 PB |
1307 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1308 | { | |
f21d96d0 | 1309 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1310 | } |
1311 | ||
4be74634 MA |
1312 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1313 | { | |
f21d96d0 | 1314 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1315 | } |
1316 | ||
1317 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1318 | { | |
f21d96d0 KW |
1319 | BlockDriverState *bs = blk_bs(blk); |
1320 | ||
1321 | if (!bs) { | |
a46fc9c9 HR |
1322 | return false; |
1323 | } | |
1324 | ||
f21d96d0 | 1325 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1326 | } |
1327 | ||
1328 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1329 | { | |
f21d96d0 KW |
1330 | BlockDriverState *bs = blk_bs(blk); |
1331 | ||
1332 | if (bs) { | |
1333 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1334 | } |
4be74634 MA |
1335 | } |
1336 | ||
1337 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1338 | { | |
f21d96d0 KW |
1339 | BlockDriverState *bs = blk_bs(blk); |
1340 | ||
1341 | if (bs) { | |
1342 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1343 | } |
4be74634 MA |
1344 | } |
1345 | ||
1346 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1347 | { | |
f21d96d0 KW |
1348 | BlockDriverState *bs = blk_bs(blk); |
1349 | ||
1350 | if (bs) { | |
1351 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1352 | } |
4be74634 MA |
1353 | } |
1354 | ||
1355 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1356 | { | |
f21d96d0 KW |
1357 | BlockDriverState *bs = blk_bs(blk); |
1358 | ||
1359 | if (bs) { | |
1360 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1361 | } else { |
1362 | return qemu_get_aio_context(); | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1367 | { | |
1368 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1369 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1370 | } |
1371 | ||
1372 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1373 | { | |
f21d96d0 KW |
1374 | BlockDriverState *bs = blk_bs(blk); |
1375 | ||
1376 | if (bs) { | |
1377 | bdrv_set_aio_context(bs, new_context); | |
a46fc9c9 | 1378 | } |
4be74634 MA |
1379 | } |
1380 | ||
2019ba0a HR |
1381 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1382 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1383 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1384 | { | |
f21d96d0 KW |
1385 | BlockDriverState *bs = blk_bs(blk); |
1386 | ||
1387 | if (bs) { | |
1388 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1389 | detach_aio_context, opaque); |
1390 | } | |
2019ba0a HR |
1391 | } |
1392 | ||
1393 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1394 | void (*attached_aio_context)(AioContext *, | |
1395 | void *), | |
1396 | void (*detach_aio_context)(void *), | |
1397 | void *opaque) | |
1398 | { | |
f21d96d0 KW |
1399 | BlockDriverState *bs = blk_bs(blk); |
1400 | ||
1401 | if (bs) { | |
1402 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1403 | detach_aio_context, opaque); |
1404 | } | |
2019ba0a HR |
1405 | } |
1406 | ||
3301f6c6 HR |
1407 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1408 | { | |
1409 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1410 | } | |
1411 | ||
1412 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1413 | { | |
1414 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1415 | } | |
1416 | ||
4be74634 MA |
1417 | void blk_io_plug(BlockBackend *blk) |
1418 | { | |
f21d96d0 KW |
1419 | BlockDriverState *bs = blk_bs(blk); |
1420 | ||
1421 | if (bs) { | |
1422 | bdrv_io_plug(bs); | |
a46fc9c9 | 1423 | } |
4be74634 MA |
1424 | } |
1425 | ||
1426 | void blk_io_unplug(BlockBackend *blk) | |
1427 | { | |
f21d96d0 KW |
1428 | BlockDriverState *bs = blk_bs(blk); |
1429 | ||
1430 | if (bs) { | |
1431 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1432 | } |
4be74634 MA |
1433 | } |
1434 | ||
1435 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1436 | { | |
7f0e9da6 | 1437 | return &blk->stats; |
4be74634 MA |
1438 | } |
1439 | ||
1440 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1441 | BlockCompletionFunc *cb, void *opaque) | |
1442 | { | |
1443 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1444 | } | |
1ef01253 | 1445 | |
983a1600 EB |
1446 | int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t offset, |
1447 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1448 | { |
983a1600 | 1449 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1450 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1451 | } |
1452 | ||
1453 | int blk_write_compressed(BlockBackend *blk, int64_t sector_num, | |
1454 | const uint8_t *buf, int nb_sectors) | |
1455 | { | |
e7f7d676 HR |
1456 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1457 | if (ret < 0) { | |
1458 | return ret; | |
1459 | } | |
1460 | ||
f21d96d0 | 1461 | return bdrv_write_compressed(blk_bs(blk), sector_num, buf, nb_sectors); |
1ef01253 HR |
1462 | } |
1463 | ||
1464 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1465 | { | |
c09ba36c HR |
1466 | if (!blk_is_available(blk)) { |
1467 | return -ENOMEDIUM; | |
1468 | } | |
1469 | ||
f21d96d0 | 1470 | return bdrv_truncate(blk_bs(blk), offset); |
1ef01253 HR |
1471 | } |
1472 | ||
1473 | int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) | |
1474 | { | |
e7f7d676 HR |
1475 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1476 | if (ret < 0) { | |
1477 | return ret; | |
1478 | } | |
1479 | ||
f21d96d0 | 1480 | return bdrv_discard(blk_bs(blk), sector_num, nb_sectors); |
1ef01253 HR |
1481 | } |
1482 | ||
1483 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1484 | int64_t pos, int size) | |
1485 | { | |
bfd18d1e KW |
1486 | int ret; |
1487 | ||
c09ba36c HR |
1488 | if (!blk_is_available(blk)) { |
1489 | return -ENOMEDIUM; | |
1490 | } | |
1491 | ||
bfd18d1e KW |
1492 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1493 | if (ret < 0) { | |
1494 | return ret; | |
1495 | } | |
1496 | ||
1497 | if (ret == size && !blk->enable_write_cache) { | |
1498 | ret = bdrv_flush(blk_bs(blk)); | |
1499 | } | |
1500 | ||
1501 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1502 | } |
1503 | ||
1504 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1505 | { | |
c09ba36c HR |
1506 | if (!blk_is_available(blk)) { |
1507 | return -ENOMEDIUM; | |
1508 | } | |
1509 | ||
f21d96d0 | 1510 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1511 | } |
f0272c4d ET |
1512 | |
1513 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1514 | { | |
c09ba36c HR |
1515 | if (!blk_is_available(blk)) { |
1516 | return -ENOMEDIUM; | |
1517 | } | |
1518 | ||
f21d96d0 | 1519 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1520 | } |
1521 | ||
1522 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1523 | { | |
c09ba36c HR |
1524 | if (!blk_is_available(blk)) { |
1525 | return -ENOMEDIUM; | |
1526 | } | |
1527 | ||
f21d96d0 | 1528 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1529 | } |
281d22d8 HR |
1530 | |
1531 | /* | |
1532 | * Updates the BlockBackendRootState object with data from the currently | |
1533 | * attached BlockDriverState. | |
1534 | */ | |
1535 | void blk_update_root_state(BlockBackend *blk) | |
1536 | { | |
f21d96d0 | 1537 | assert(blk->root); |
281d22d8 | 1538 | |
f21d96d0 KW |
1539 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1540 | blk->root_state.read_only = blk->root->bs->read_only; | |
1541 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1542 | |
1543 | if (blk->root_state.throttle_group) { | |
1544 | g_free(blk->root_state.throttle_group); | |
1545 | throttle_group_unref(blk->root_state.throttle_state); | |
1546 | } | |
27ccdd52 | 1547 | if (blk->public.throttle_state) { |
49d2165d | 1548 | const char *name = throttle_group_get_name(blk); |
281d22d8 HR |
1549 | blk->root_state.throttle_group = g_strdup(name); |
1550 | blk->root_state.throttle_state = throttle_group_incref(name); | |
1551 | } else { | |
1552 | blk->root_state.throttle_group = NULL; | |
1553 | blk->root_state.throttle_state = NULL; | |
1554 | } | |
1555 | } | |
1556 | ||
38cb18f5 HR |
1557 | /* |
1558 | * Applies the information in the root state to the given BlockDriverState. This | |
1559 | * does not include the flags which have to be specified for bdrv_open(), use | |
1560 | * blk_get_open_flags_from_root_state() to inquire them. | |
1561 | */ | |
1562 | void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs) | |
1563 | { | |
1564 | bs->detect_zeroes = blk->root_state.detect_zeroes; | |
1565 | if (blk->root_state.throttle_group) { | |
97148076 | 1566 | blk_io_limits_enable(blk, blk->root_state.throttle_group); |
38cb18f5 HR |
1567 | } |
1568 | } | |
1569 | ||
1570 | /* | |
1571 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1572 | * supposed to inherit the root state. | |
1573 | */ | |
1574 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1575 | { | |
1576 | int bs_flags; | |
1577 | ||
1578 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1579 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1580 | ||
1581 | return bs_flags; | |
1582 | } | |
1583 | ||
281d22d8 HR |
1584 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1585 | { | |
1586 | return &blk->root_state; | |
1587 | } | |
1393f212 HR |
1588 | |
1589 | int blk_commit_all(void) | |
1590 | { | |
fe1a9cbc HR |
1591 | BlockBackend *blk = NULL; |
1592 | ||
1593 | while ((blk = blk_all_next(blk)) != NULL) { | |
1594 | AioContext *aio_context = blk_get_aio_context(blk); | |
1595 | ||
1596 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1597 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1598 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1599 | if (ret < 0) { |
1600 | aio_context_release(aio_context); | |
1601 | return ret; | |
1602 | } | |
1603 | } | |
1604 | aio_context_release(aio_context); | |
1605 | } | |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | int blk_flush_all(void) | |
1610 | { | |
1611 | BlockBackend *blk = NULL; | |
1612 | int result = 0; | |
1613 | ||
1614 | while ((blk = blk_all_next(blk)) != NULL) { | |
1615 | AioContext *aio_context = blk_get_aio_context(blk); | |
1616 | int ret; | |
1617 | ||
1618 | aio_context_acquire(aio_context); | |
1619 | if (blk_is_inserted(blk)) { | |
1620 | ret = blk_flush(blk); | |
1621 | if (ret < 0 && !result) { | |
1622 | result = ret; | |
1623 | } | |
1624 | } | |
1625 | aio_context_release(aio_context); | |
1626 | } | |
1627 | ||
1628 | return result; | |
1393f212 | 1629 | } |
97148076 KW |
1630 | |
1631 | ||
1632 | /* throttling disk I/O limits */ | |
1633 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
1634 | { | |
1635 | throttle_group_config(blk, cfg); | |
1636 | } | |
1637 | ||
1638 | void blk_io_limits_disable(BlockBackend *blk) | |
1639 | { | |
1640 | assert(blk->public.throttle_state); | |
c2066af0 | 1641 | bdrv_drained_begin(blk_bs(blk)); |
97148076 | 1642 | throttle_group_unregister_blk(blk); |
c2066af0 | 1643 | bdrv_drained_end(blk_bs(blk)); |
97148076 KW |
1644 | } |
1645 | ||
1646 | /* should be called before blk_set_io_limits if a limit is set */ | |
1647 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
1648 | { | |
1649 | assert(!blk->public.throttle_state); | |
1650 | throttle_group_register_blk(blk, group); | |
1651 | } | |
1652 | ||
1653 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
1654 | { | |
1655 | /* this BB is not part of any group */ | |
1656 | if (!blk->public.throttle_state) { | |
1657 | return; | |
1658 | } | |
1659 | ||
1660 | /* this BB is a part of the same group than the one we want */ | |
1661 | if (!g_strcmp0(throttle_group_get_name(blk), group)) { | |
1662 | return; | |
1663 | } | |
1664 | ||
1665 | /* need to change the group this bs belong to */ | |
1666 | blk_io_limits_disable(blk); | |
1667 | blk_io_limits_enable(blk, group); | |
1668 | } | |
c2066af0 KW |
1669 | |
1670 | static void blk_root_drained_begin(BdrvChild *child) | |
1671 | { | |
1672 | BlockBackend *blk = child->opaque; | |
1673 | ||
1674 | if (blk->public.io_limits_disabled++ == 0) { | |
1675 | throttle_group_restart_blk(blk); | |
1676 | } | |
1677 | } | |
1678 | ||
1679 | static void blk_root_drained_end(BdrvChild *child) | |
1680 | { | |
1681 | BlockBackend *blk = child->opaque; | |
1682 | ||
1683 | assert(blk->public.io_limits_disabled); | |
1684 | --blk->public.io_limits_disabled; | |
1685 | } |