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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" |
1e98fefd | 22 | #include "trace.h" |
a7f53e26 MA |
23 | |
24 | /* Number of coroutines to reserve per attached device model */ | |
25 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 26 | |
1bf1cbc9 KW |
27 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
28 | ||
4981bdec HR |
29 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
30 | ||
26f54e9a MA |
31 | struct BlockBackend { |
32 | char *name; | |
33 | int refcnt; | |
f21d96d0 | 34 | BdrvChild *root; |
26f8b3a8 | 35 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 36 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 37 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 38 | BlockBackendPublic public; |
a7f53e26 MA |
39 | |
40 | void *dev; /* attached device model, if any */ | |
bbc8ea98 | 41 | bool legacy_dev; /* true if dev is not a DeviceState */ |
a7f53e26 MA |
42 | /* TODO change to DeviceState when all users are qdevified */ |
43 | const BlockDevOps *dev_ops; | |
44 | void *dev_opaque; | |
68e9ec01 HR |
45 | |
46 | /* the block size for which the guest device expects atomicity */ | |
47 | int guest_block_size; | |
7f0e9da6 | 48 | |
281d22d8 HR |
49 | /* If the BDS tree is removed, some of its options are stored here (which |
50 | * can be used to restore those options in the new BDS on insert) */ | |
51 | BlockBackendRootState root_state; | |
52 | ||
bfd18d1e KW |
53 | bool enable_write_cache; |
54 | ||
7f0e9da6 HR |
55 | /* I/O stats (display with "info blockstats"). */ |
56 | BlockAcctStats stats; | |
373340b2 HR |
57 | |
58 | BlockdevOnError on_read_error, on_write_error; | |
59 | bool iostatus_enabled; | |
60 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 61 | |
981776b3 KW |
62 | uint64_t perm; |
63 | uint64_t shared_perm; | |
64 | ||
c10c9d96 KW |
65 | bool allow_write_beyond_eof; |
66 | ||
3301f6c6 | 67 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
26f54e9a MA |
68 | }; |
69 | ||
e7f7d676 HR |
70 | typedef struct BlockBackendAIOCB { |
71 | BlockAIOCB common; | |
4981bdec | 72 | BlockBackend *blk; |
e7f7d676 HR |
73 | int ret; |
74 | } BlockBackendAIOCB; | |
75 | ||
76 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 77 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
78 | .aiocb_size = sizeof(BlockBackendAIOCB), |
79 | }; | |
80 | ||
8fb3c76c | 81 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 82 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
b5411555 | 83 | static char *blk_get_attached_dev_id(BlockBackend *blk); |
8fb3c76c | 84 | |
2cf22d6a HR |
85 | /* All BlockBackends */ |
86 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
87 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
88 | ||
9492b0b9 HR |
89 | /* All BlockBackends referenced by the monitor and which are iterated through by |
90 | * blk_next() */ | |
91 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
92 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 93 | |
f21d96d0 KW |
94 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
95 | int parent_flags, QDict *parent_options) | |
96 | { | |
97 | /* We're not supposed to call this function for root nodes */ | |
98 | abort(); | |
99 | } | |
c2066af0 KW |
100 | static void blk_root_drained_begin(BdrvChild *child); |
101 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 | 102 | |
5c8cab48 KW |
103 | static void blk_root_change_media(BdrvChild *child, bool load); |
104 | static void blk_root_resize(BdrvChild *child); | |
105 | ||
b5411555 KW |
106 | static char *blk_root_get_parent_desc(BdrvChild *child) |
107 | { | |
108 | BlockBackend *blk = child->opaque; | |
109 | char *dev_id; | |
110 | ||
111 | if (blk->name) { | |
112 | return g_strdup(blk->name); | |
113 | } | |
114 | ||
115 | dev_id = blk_get_attached_dev_id(blk); | |
116 | if (*dev_id) { | |
117 | return dev_id; | |
118 | } else { | |
119 | /* TODO Callback into the BB owner for something more detailed */ | |
120 | g_free(dev_id); | |
121 | return g_strdup("a block device"); | |
122 | } | |
123 | } | |
124 | ||
4c265bf9 KW |
125 | static const char *blk_root_get_name(BdrvChild *child) |
126 | { | |
127 | return blk_name(child->opaque); | |
128 | } | |
129 | ||
f21d96d0 | 130 | static const BdrvChildRole child_root = { |
c2066af0 KW |
131 | .inherit_options = blk_root_inherit_options, |
132 | ||
5c8cab48 KW |
133 | .change_media = blk_root_change_media, |
134 | .resize = blk_root_resize, | |
4c265bf9 | 135 | .get_name = blk_root_get_name, |
b5411555 | 136 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 137 | |
c2066af0 KW |
138 | .drained_begin = blk_root_drained_begin, |
139 | .drained_end = blk_root_drained_end, | |
f21d96d0 KW |
140 | }; |
141 | ||
26f54e9a | 142 | /* |
efaa7c4e | 143 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
144 | * |
145 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
146 | * to request for a block driver node that is attached to this BlockBackend. | |
147 | * @shared_perm is a bitmask which describes which permissions may be granted | |
148 | * to other users of the attached node. | |
149 | * Both sets of permissions can be changed later using blk_set_perm(). | |
150 | * | |
26f54e9a MA |
151 | * Return the new BlockBackend on success, null on failure. |
152 | */ | |
6d0eb64d | 153 | BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
154 | { |
155 | BlockBackend *blk; | |
156 | ||
26f54e9a | 157 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 158 | blk->refcnt = 1; |
6d0eb64d KW |
159 | blk->perm = perm; |
160 | blk->shared_perm = shared_perm; | |
0c3169df KW |
161 | blk_set_enable_write_cache(blk, true); |
162 | ||
27ccdd52 KW |
163 | qemu_co_queue_init(&blk->public.throttled_reqs[0]); |
164 | qemu_co_queue_init(&blk->public.throttled_reqs[1]); | |
165 | ||
3301f6c6 HR |
166 | notifier_list_init(&blk->remove_bs_notifiers); |
167 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 168 | |
2cf22d6a | 169 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
170 | return blk; |
171 | } | |
172 | ||
7e7d56d9 | 173 | /* |
28eb9b12 | 174 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
175 | * |
176 | * Just as with bdrv_open(), after having called this function the reference to | |
177 | * @options belongs to the block layer (even on failure). | |
178 | * | |
179 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
180 | * BDS tree just by specifying the @options QDict (or @reference, | |
181 | * alternatively). At the time of adding this function, this is not possible, | |
182 | * though, so callers of this function have to be able to specify @filename and | |
183 | * @flags. | |
184 | */ | |
efaa7c4e HR |
185 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
186 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
187 | { |
188 | BlockBackend *blk; | |
28eb9b12 | 189 | BlockDriverState *bs; |
c62d32f5 KW |
190 | uint64_t perm; |
191 | ||
192 | /* blk_new_open() is mainly used in .bdrv_create implementations and the | |
193 | * tools where sharing isn't a concern because the BDS stays private, so we | |
194 | * just request permission according to the flags. | |
195 | * | |
196 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
197 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
198 | * shouldn't hurt either. We can still share everything here because the | |
199 | * guest devices will add their own blockers if they can't share. */ | |
200 | perm = BLK_PERM_CONSISTENT_READ; | |
201 | if (flags & BDRV_O_RDWR) { | |
202 | perm |= BLK_PERM_WRITE; | |
203 | } | |
204 | if (flags & BDRV_O_RESIZE) { | |
205 | perm |= BLK_PERM_RESIZE; | |
206 | } | |
ca49a4fd | 207 | |
c62d32f5 | 208 | blk = blk_new(perm, BLK_PERM_ALL); |
5b363937 HR |
209 | bs = bdrv_open(filename, reference, options, flags, errp); |
210 | if (!bs) { | |
ca49a4fd HR |
211 | blk_unref(blk); |
212 | return NULL; | |
213 | } | |
214 | ||
d5e6f437 | 215 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
c62d32f5 | 216 | perm, BLK_PERM_ALL, blk, &error_abort); |
72e775c7 | 217 | |
ca49a4fd HR |
218 | return blk; |
219 | } | |
220 | ||
26f54e9a MA |
221 | static void blk_delete(BlockBackend *blk) |
222 | { | |
223 | assert(!blk->refcnt); | |
e5e78550 | 224 | assert(!blk->name); |
a7f53e26 | 225 | assert(!blk->dev); |
f21d96d0 | 226 | if (blk->root) { |
13855c6b | 227 | blk_remove_bs(blk); |
7e7d56d9 | 228 | } |
3301f6c6 HR |
229 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
230 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
2cf22d6a | 231 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 232 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 233 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
234 | g_free(blk); |
235 | } | |
236 | ||
8fb3c76c MA |
237 | static void drive_info_del(DriveInfo *dinfo) |
238 | { | |
239 | if (!dinfo) { | |
240 | return; | |
241 | } | |
242 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
243 | g_free(dinfo->serial); |
244 | g_free(dinfo); | |
245 | } | |
246 | ||
f636ae85 AG |
247 | int blk_get_refcnt(BlockBackend *blk) |
248 | { | |
249 | return blk ? blk->refcnt : 0; | |
250 | } | |
251 | ||
26f54e9a MA |
252 | /* |
253 | * Increment @blk's reference count. | |
254 | * @blk must not be null. | |
255 | */ | |
256 | void blk_ref(BlockBackend *blk) | |
257 | { | |
258 | blk->refcnt++; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Decrement @blk's reference count. | |
263 | * If this drops it to zero, destroy @blk. | |
264 | * For convenience, do nothing if @blk is null. | |
265 | */ | |
266 | void blk_unref(BlockBackend *blk) | |
267 | { | |
268 | if (blk) { | |
269 | assert(blk->refcnt > 0); | |
270 | if (!--blk->refcnt) { | |
271 | blk_delete(blk); | |
272 | } | |
273 | } | |
274 | } | |
275 | ||
2cf22d6a HR |
276 | /* |
277 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
278 | * ones which are hidden (i.e. are not referenced by the monitor). | |
279 | */ | |
280 | static BlockBackend *blk_all_next(BlockBackend *blk) | |
281 | { | |
282 | return blk ? QTAILQ_NEXT(blk, link) | |
283 | : QTAILQ_FIRST(&block_backends); | |
284 | } | |
285 | ||
d8da3cef HR |
286 | void blk_remove_all_bs(void) |
287 | { | |
74d1b8fc | 288 | BlockBackend *blk = NULL; |
d8da3cef | 289 | |
2cf22d6a | 290 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
291 | AioContext *ctx = blk_get_aio_context(blk); |
292 | ||
293 | aio_context_acquire(ctx); | |
f21d96d0 | 294 | if (blk->root) { |
d8da3cef HR |
295 | blk_remove_bs(blk); |
296 | } | |
297 | aio_context_release(ctx); | |
298 | } | |
299 | } | |
300 | ||
26f54e9a | 301 | /* |
9492b0b9 | 302 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
303 | * If @blk is null, return the first one. |
304 | * Else, return @blk's next sibling, which may be null. | |
305 | * | |
306 | * To iterate over all BlockBackends, do | |
307 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
308 | * ... | |
309 | * } | |
310 | */ | |
311 | BlockBackend *blk_next(BlockBackend *blk) | |
312 | { | |
9492b0b9 HR |
313 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
314 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
315 | } |
316 | ||
7c8eece4 KW |
317 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
318 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 319 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 320 | { |
88be7b4b | 321 | BlockDriverState *bs; |
981f4f57 | 322 | |
7c8eece4 KW |
323 | /* First, return all root nodes of BlockBackends. In order to avoid |
324 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
325 | * if the BB is the first one in the parent list of the BDS. */ | |
326 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
327 | do { | |
328 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
329 | bs = it->blk ? blk_bs(it->blk) : NULL; |
330 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 331 | |
88be7b4b KW |
332 | if (bs) { |
333 | return bs; | |
7c8eece4 KW |
334 | } |
335 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
336 | } | |
337 | ||
338 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
339 | * BDSes that are attached to a BlockBackend here; they have been handled | |
340 | * by the above block already */ | |
981f4f57 | 341 | do { |
7c8eece4 | 342 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
343 | bs = it->bs; |
344 | } while (bs && bdrv_has_blk(bs)); | |
345 | ||
346 | return bs; | |
347 | } | |
348 | ||
349 | BlockDriverState *bdrv_first(BdrvNextIterator *it) | |
350 | { | |
351 | *it = (BdrvNextIterator) { | |
352 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
353 | }; | |
981f4f57 | 354 | |
88be7b4b | 355 | return bdrv_next(it); |
981f4f57 HR |
356 | } |
357 | ||
e5e78550 HR |
358 | /* |
359 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
360 | * the given @name acting as the handle for the monitor. | |
361 | * Strictly for use by blockdev.c. | |
362 | * | |
363 | * @name must not be null or empty. | |
364 | * | |
365 | * Returns true on success and false on failure. In the latter case, an Error | |
366 | * object is returned through @errp. | |
367 | */ | |
368 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
369 | { | |
370 | assert(!blk->name); | |
371 | assert(name && name[0]); | |
372 | ||
373 | if (!id_wellformed(name)) { | |
374 | error_setg(errp, "Invalid device name"); | |
375 | return false; | |
376 | } | |
377 | if (blk_by_name(name)) { | |
378 | error_setg(errp, "Device with id '%s' already exists", name); | |
379 | return false; | |
380 | } | |
381 | if (bdrv_find_node(name)) { | |
382 | error_setg(errp, | |
383 | "Device name '%s' conflicts with an existing node name", | |
384 | name); | |
385 | return false; | |
386 | } | |
387 | ||
388 | blk->name = g_strdup(name); | |
389 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
390 | return true; | |
391 | } | |
392 | ||
393 | /* | |
394 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
395 | * Strictly for use by blockdev.c. | |
396 | */ | |
397 | void monitor_remove_blk(BlockBackend *blk) | |
398 | { | |
399 | if (!blk->name) { | |
400 | return; | |
401 | } | |
402 | ||
403 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
404 | g_free(blk->name); | |
405 | blk->name = NULL; | |
406 | } | |
407 | ||
26f54e9a | 408 | /* |
7e7d56d9 | 409 | * Return @blk's name, a non-null string. |
e5e78550 | 410 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a MA |
411 | */ |
412 | const char *blk_name(BlockBackend *blk) | |
413 | { | |
e5e78550 | 414 | return blk->name ?: ""; |
26f54e9a MA |
415 | } |
416 | ||
417 | /* | |
418 | * Return the BlockBackend with name @name if it exists, else null. | |
419 | * @name must not be null. | |
420 | */ | |
421 | BlockBackend *blk_by_name(const char *name) | |
422 | { | |
74d1b8fc | 423 | BlockBackend *blk = NULL; |
26f54e9a MA |
424 | |
425 | assert(name); | |
74d1b8fc | 426 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
427 | if (!strcmp(name, blk->name)) { |
428 | return blk; | |
429 | } | |
430 | } | |
431 | return NULL; | |
432 | } | |
7e7d56d9 MA |
433 | |
434 | /* | |
435 | * Return the BlockDriverState attached to @blk if any, else null. | |
436 | */ | |
437 | BlockDriverState *blk_bs(BlockBackend *blk) | |
438 | { | |
f21d96d0 | 439 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
440 | } |
441 | ||
7c8eece4 | 442 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
443 | { |
444 | BdrvChild *child; | |
445 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
446 | if (child->role == &child_root) { | |
7c8eece4 | 447 | return child->opaque; |
dde33812 KW |
448 | } |
449 | } | |
450 | ||
7c8eece4 KW |
451 | return NULL; |
452 | } | |
453 | ||
454 | /* | |
455 | * Returns true if @bs has an associated BlockBackend. | |
456 | */ | |
457 | bool bdrv_has_blk(BlockDriverState *bs) | |
458 | { | |
459 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
460 | } |
461 | ||
b6c1bae5 KW |
462 | /* |
463 | * Returns true if @bs has only BlockBackends as parents. | |
464 | */ | |
465 | bool bdrv_is_root_node(BlockDriverState *bs) | |
466 | { | |
467 | BdrvChild *c; | |
468 | ||
469 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
470 | if (c->role != &child_root) { | |
471 | return false; | |
472 | } | |
473 | } | |
474 | ||
475 | return true; | |
476 | } | |
477 | ||
18e46a03 MA |
478 | /* |
479 | * Return @blk's DriveInfo if any, else null. | |
480 | */ | |
481 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
482 | { | |
483 | return blk->legacy_dinfo; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Set @blk's DriveInfo to @dinfo, and return it. | |
488 | * @blk must not have a DriveInfo set already. | |
489 | * No other BlockBackend may have the same DriveInfo set. | |
490 | */ | |
491 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
492 | { | |
493 | assert(!blk->legacy_dinfo); | |
494 | return blk->legacy_dinfo = dinfo; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Return the BlockBackend with DriveInfo @dinfo. | |
499 | * It must exist. | |
500 | */ | |
501 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
502 | { | |
74d1b8fc | 503 | BlockBackend *blk = NULL; |
18e46a03 | 504 | |
74d1b8fc | 505 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
506 | if (blk->legacy_dinfo == dinfo) { |
507 | return blk; | |
508 | } | |
509 | } | |
510 | abort(); | |
511 | } | |
512 | ||
f2cd875d KW |
513 | /* |
514 | * Returns a pointer to the publicly accessible fields of @blk. | |
515 | */ | |
516 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
517 | { | |
518 | return &blk->public; | |
519 | } | |
520 | ||
521 | /* | |
522 | * Returns a BlockBackend given the associated @public fields. | |
523 | */ | |
524 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
525 | { | |
526 | return container_of(public, BlockBackend, public); | |
527 | } | |
528 | ||
1c95f7e1 HR |
529 | /* |
530 | * Disassociates the currently associated BlockDriverState from @blk. | |
531 | */ | |
532 | void blk_remove_bs(BlockBackend *blk) | |
533 | { | |
3301f6c6 | 534 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
27ccdd52 | 535 | if (blk->public.throttle_state) { |
7ca7f0f6 | 536 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); |
a5614993 | 537 | } |
1c95f7e1 | 538 | |
7ca7f0f6 KW |
539 | blk_update_root_state(blk); |
540 | ||
f21d96d0 KW |
541 | bdrv_root_unref_child(blk->root); |
542 | blk->root = NULL; | |
1c95f7e1 HR |
543 | } |
544 | ||
0c3c36d6 HR |
545 | /* |
546 | * Associates a new BlockDriverState with @blk. | |
547 | */ | |
d7086422 | 548 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 549 | { |
d5e6f437 | 550 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
d7086422 KW |
551 | blk->perm, blk->shared_perm, blk, errp); |
552 | if (blk->root == NULL) { | |
553 | return -EPERM; | |
554 | } | |
555 | bdrv_ref(bs); | |
3301f6c6 HR |
556 | |
557 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
7ca7f0f6 KW |
558 | if (blk->public.throttle_state) { |
559 | throttle_timers_attach_aio_context( | |
560 | &blk->public.throttle_timers, bdrv_get_aio_context(bs)); | |
561 | } | |
d7086422 KW |
562 | |
563 | return 0; | |
0c3c36d6 HR |
564 | } |
565 | ||
981776b3 KW |
566 | /* |
567 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
568 | */ | |
569 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
570 | Error **errp) | |
571 | { | |
572 | int ret; | |
573 | ||
574 | if (blk->root) { | |
575 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); | |
576 | if (ret < 0) { | |
577 | return ret; | |
578 | } | |
579 | } | |
580 | ||
581 | blk->perm = perm; | |
582 | blk->shared_perm = shared_perm; | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
887354bd KW |
587 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
588 | { | |
589 | *perm = blk->perm; | |
590 | *shared_perm = blk->shared_perm; | |
591 | } | |
592 | ||
bbc8ea98 | 593 | static int blk_do_attach_dev(BlockBackend *blk, void *dev) |
4be74634 | 594 | { |
a7f53e26 MA |
595 | if (blk->dev) { |
596 | return -EBUSY; | |
597 | } | |
84ebe375 | 598 | blk_ref(blk); |
a7f53e26 | 599 | blk->dev = dev; |
bbc8ea98 | 600 | blk->legacy_dev = false; |
373340b2 | 601 | blk_iostatus_reset(blk); |
a7f53e26 | 602 | return 0; |
4be74634 MA |
603 | } |
604 | ||
bbc8ea98 KW |
605 | /* |
606 | * Attach device model @dev to @blk. | |
607 | * Return 0 on success, -EBUSY when a device model is attached already. | |
608 | */ | |
609 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
610 | { | |
611 | return blk_do_attach_dev(blk, dev); | |
612 | } | |
613 | ||
a7f53e26 MA |
614 | /* |
615 | * Attach device model @dev to @blk. | |
616 | * @blk must not have a device model attached already. | |
617 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
618 | */ | |
bbc8ea98 | 619 | void blk_attach_dev_legacy(BlockBackend *blk, void *dev) |
4be74634 | 620 | { |
bbc8ea98 | 621 | if (blk_do_attach_dev(blk, dev) < 0) { |
a7f53e26 MA |
622 | abort(); |
623 | } | |
bbc8ea98 | 624 | blk->legacy_dev = true; |
4be74634 MA |
625 | } |
626 | ||
a7f53e26 MA |
627 | /* |
628 | * Detach device model @dev from @blk. | |
629 | * @dev must be currently attached to @blk. | |
630 | */ | |
4be74634 | 631 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 632 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 633 | { |
a7f53e26 MA |
634 | assert(blk->dev == dev); |
635 | blk->dev = NULL; | |
636 | blk->dev_ops = NULL; | |
637 | blk->dev_opaque = NULL; | |
68e9ec01 | 638 | blk->guest_block_size = 512; |
981776b3 | 639 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 640 | blk_unref(blk); |
4be74634 MA |
641 | } |
642 | ||
a7f53e26 MA |
643 | /* |
644 | * Return the device model attached to @blk if any, else null. | |
645 | */ | |
4be74634 | 646 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
647 | /* TODO change to return DeviceState * when all users are qdevified */ |
648 | { | |
649 | return blk->dev; | |
650 | } | |
651 | ||
2d76e724 KW |
652 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
653 | * device attached to the BlockBackend. */ | |
654 | static char *blk_get_attached_dev_id(BlockBackend *blk) | |
655 | { | |
656 | DeviceState *dev; | |
657 | ||
658 | assert(!blk->legacy_dev); | |
659 | dev = blk->dev; | |
660 | ||
661 | if (!dev) { | |
662 | return g_strdup(""); | |
663 | } else if (dev->id) { | |
664 | return g_strdup(dev->id); | |
665 | } | |
666 | return object_get_canonical_path(OBJECT(dev)); | |
667 | } | |
668 | ||
1c89e1fa KW |
669 | /* |
670 | * Return the BlockBackend which has the device model @dev attached if it | |
671 | * exists, else null. | |
672 | * | |
673 | * @dev must not be null. | |
674 | */ | |
675 | BlockBackend *blk_by_dev(void *dev) | |
676 | { | |
677 | BlockBackend *blk = NULL; | |
678 | ||
679 | assert(dev != NULL); | |
680 | while ((blk = blk_all_next(blk)) != NULL) { | |
681 | if (blk->dev == dev) { | |
682 | return blk; | |
683 | } | |
684 | } | |
685 | return NULL; | |
686 | } | |
687 | ||
a7f53e26 MA |
688 | /* |
689 | * Set @blk's device model callbacks to @ops. | |
690 | * @opaque is the opaque argument to pass to the callbacks. | |
691 | * This is for use by device models. | |
692 | */ | |
693 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
694 | void *opaque) | |
695 | { | |
bbc8ea98 KW |
696 | /* All drivers that use blk_set_dev_ops() are qdevified and we want to keep |
697 | * it that way, so we can assume blk->dev is a DeviceState if blk->dev_ops | |
698 | * is set. */ | |
699 | assert(!blk->legacy_dev); | |
700 | ||
a7f53e26 MA |
701 | blk->dev_ops = ops; |
702 | blk->dev_opaque = opaque; | |
703 | } | |
704 | ||
705 | /* | |
706 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
707 | * |
708 | * If @load is true, notify of media load. This action can fail, meaning that | |
709 | * the medium cannot be loaded. @errp is set then. | |
710 | * | |
711 | * If @load is false, notify of media eject. This can never fail. | |
712 | * | |
a7f53e26 MA |
713 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
714 | */ | |
39829a01 | 715 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 MA |
716 | { |
717 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 718 | bool tray_was_open, tray_is_open; |
39829a01 | 719 | Error *local_err = NULL; |
a7f53e26 | 720 | |
2d76e724 KW |
721 | assert(!blk->legacy_dev); |
722 | ||
f1f57066 | 723 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
724 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
725 | if (local_err) { | |
726 | assert(load == true); | |
727 | error_propagate(errp, local_err); | |
728 | return; | |
729 | } | |
f1f57066 HR |
730 | tray_is_open = blk_dev_is_tray_open(blk); |
731 | ||
732 | if (tray_was_open != tray_is_open) { | |
2d76e724 KW |
733 | char *id = blk_get_attached_dev_id(blk); |
734 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open, | |
f1f57066 | 735 | &error_abort); |
2d76e724 | 736 | g_free(id); |
a7f53e26 MA |
737 | } |
738 | } | |
739 | } | |
740 | ||
5c8cab48 KW |
741 | static void blk_root_change_media(BdrvChild *child, bool load) |
742 | { | |
39829a01 | 743 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
744 | } |
745 | ||
a7f53e26 MA |
746 | /* |
747 | * Does @blk's attached device model have removable media? | |
748 | * %true if no device model is attached. | |
749 | */ | |
750 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
751 | { | |
752 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
753 | } | |
754 | ||
8f3a73bc HR |
755 | /* |
756 | * Does @blk's attached device model have a tray? | |
757 | */ | |
758 | bool blk_dev_has_tray(BlockBackend *blk) | |
759 | { | |
760 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
761 | } | |
762 | ||
a7f53e26 MA |
763 | /* |
764 | * Notify @blk's attached device model of a media eject request. | |
765 | * If @force is true, the medium is about to be yanked out forcefully. | |
766 | */ | |
767 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 768 | { |
a7f53e26 MA |
769 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
770 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
771 | } | |
4be74634 MA |
772 | } |
773 | ||
a7f53e26 MA |
774 | /* |
775 | * Does @blk's attached device model have a tray, and is it open? | |
776 | */ | |
777 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 778 | { |
8f3a73bc | 779 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
780 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
781 | } | |
782 | return false; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Does @blk's attached device model have the medium locked? | |
787 | * %false if the device model has no such lock. | |
788 | */ | |
789 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
790 | { | |
791 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
792 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
793 | } | |
794 | return false; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Notify @blk's attached device model of a backend size change. | |
799 | */ | |
5c8cab48 | 800 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 801 | { |
5c8cab48 KW |
802 | BlockBackend *blk = child->opaque; |
803 | ||
a7f53e26 MA |
804 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
805 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
806 | } | |
807 | } | |
808 | ||
809 | void blk_iostatus_enable(BlockBackend *blk) | |
810 | { | |
373340b2 HR |
811 | blk->iostatus_enabled = true; |
812 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
813 | } | |
814 | ||
815 | /* The I/O status is only enabled if the drive explicitly | |
816 | * enables it _and_ the VM is configured to stop on errors */ | |
817 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
818 | { | |
819 | return (blk->iostatus_enabled && | |
820 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
821 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
822 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
823 | } | |
824 | ||
825 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
826 | { | |
827 | return blk->iostatus; | |
828 | } | |
829 | ||
830 | void blk_iostatus_disable(BlockBackend *blk) | |
831 | { | |
832 | blk->iostatus_enabled = false; | |
833 | } | |
834 | ||
835 | void blk_iostatus_reset(BlockBackend *blk) | |
836 | { | |
837 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 838 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 839 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
840 | if (bs && bs->job) { |
841 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
842 | } |
843 | } | |
844 | } | |
845 | ||
846 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
847 | { | |
848 | assert(blk_iostatus_is_enabled(blk)); | |
849 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
850 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
851 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
852 | } | |
4be74634 MA |
853 | } |
854 | ||
c10c9d96 KW |
855 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
856 | { | |
857 | blk->allow_write_beyond_eof = allow; | |
858 | } | |
859 | ||
e7f7d676 HR |
860 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
861 | size_t size) | |
862 | { | |
863 | int64_t len; | |
864 | ||
865 | if (size > INT_MAX) { | |
866 | return -EIO; | |
867 | } | |
868 | ||
c09ba36c | 869 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
870 | return -ENOMEDIUM; |
871 | } | |
872 | ||
e7f7d676 HR |
873 | if (offset < 0) { |
874 | return -EIO; | |
875 | } | |
876 | ||
c10c9d96 KW |
877 | if (!blk->allow_write_beyond_eof) { |
878 | len = blk_getlength(blk); | |
879 | if (len < 0) { | |
880 | return len; | |
881 | } | |
882 | ||
883 | if (offset > len || len - offset < size) { | |
884 | return -EIO; | |
885 | } | |
e7f7d676 HR |
886 | } |
887 | ||
888 | return 0; | |
889 | } | |
890 | ||
1e98fefd KW |
891 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
892 | unsigned int bytes, QEMUIOVector *qiov, | |
893 | BdrvRequestFlags flags) | |
4be74634 | 894 | { |
1e98fefd | 895 | int ret; |
99723548 | 896 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 897 | |
99723548 | 898 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
899 | |
900 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
901 | if (ret < 0) { |
902 | return ret; | |
903 | } | |
904 | ||
99723548 PB |
905 | bdrv_inc_in_flight(bs); |
906 | ||
441565b2 KW |
907 | /* throttling disk I/O */ |
908 | if (blk->public.throttle_state) { | |
909 | throttle_group_co_io_limits_intercept(blk, bytes, false); | |
910 | } | |
911 | ||
99723548 PB |
912 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
913 | bdrv_dec_in_flight(bs); | |
914 | return ret; | |
1bf1cbc9 KW |
915 | } |
916 | ||
1e98fefd KW |
917 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
918 | unsigned int bytes, QEMUIOVector *qiov, | |
919 | BdrvRequestFlags flags) | |
a8823a3b | 920 | { |
bfd18d1e | 921 | int ret; |
99723548 | 922 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 923 | |
99723548 | 924 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 925 | |
bfd18d1e | 926 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
927 | if (ret < 0) { |
928 | return ret; | |
929 | } | |
930 | ||
99723548 PB |
931 | bdrv_inc_in_flight(bs); |
932 | ||
441565b2 KW |
933 | /* throttling disk I/O */ |
934 | if (blk->public.throttle_state) { | |
935 | throttle_group_co_io_limits_intercept(blk, bytes, true); | |
936 | } | |
937 | ||
bfd18d1e KW |
938 | if (!blk->enable_write_cache) { |
939 | flags |= BDRV_REQ_FUA; | |
940 | } | |
941 | ||
99723548 PB |
942 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
943 | bdrv_dec_in_flight(bs); | |
944 | return ret; | |
a8823a3b KW |
945 | } |
946 | ||
1bf1cbc9 KW |
947 | typedef struct BlkRwCo { |
948 | BlockBackend *blk; | |
949 | int64_t offset; | |
950 | QEMUIOVector *qiov; | |
951 | int ret; | |
952 | BdrvRequestFlags flags; | |
953 | } BlkRwCo; | |
954 | ||
955 | static void blk_read_entry(void *opaque) | |
956 | { | |
957 | BlkRwCo *rwco = opaque; | |
958 | ||
959 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
960 | rwco->qiov, rwco->flags); | |
961 | } | |
962 | ||
a8823a3b KW |
963 | static void blk_write_entry(void *opaque) |
964 | { | |
965 | BlkRwCo *rwco = opaque; | |
966 | ||
967 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
968 | rwco->qiov, rwco->flags); | |
969 | } | |
970 | ||
a55d3fba KW |
971 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
972 | int64_t bytes, CoroutineEntry co_entry, | |
973 | BdrvRequestFlags flags) | |
1bf1cbc9 | 974 | { |
1bf1cbc9 KW |
975 | QEMUIOVector qiov; |
976 | struct iovec iov; | |
1bf1cbc9 KW |
977 | BlkRwCo rwco; |
978 | ||
1bf1cbc9 KW |
979 | iov = (struct iovec) { |
980 | .iov_base = buf, | |
a55d3fba | 981 | .iov_len = bytes, |
1bf1cbc9 KW |
982 | }; |
983 | qemu_iovec_init_external(&qiov, &iov, 1); | |
984 | ||
985 | rwco = (BlkRwCo) { | |
986 | .blk = blk, | |
a55d3fba | 987 | .offset = offset, |
1bf1cbc9 | 988 | .qiov = &qiov, |
fc1453cd | 989 | .flags = flags, |
1bf1cbc9 KW |
990 | .ret = NOT_DONE, |
991 | }; | |
992 | ||
35f106e6 PB |
993 | if (qemu_in_coroutine()) { |
994 | /* Fast-path if already in coroutine context */ | |
995 | co_entry(&rwco); | |
996 | } else { | |
997 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
998 | qemu_coroutine_enter(co); | |
999 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); | |
1000 | } | |
1bf1cbc9 KW |
1001 | |
1002 | return rwco.ret; | |
4be74634 MA |
1003 | } |
1004 | ||
b7d17f9f EB |
1005 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1006 | int count) | |
4be74634 | 1007 | { |
5bd51196 KW |
1008 | int ret; |
1009 | ||
b7d17f9f | 1010 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1011 | if (ret < 0) { |
1012 | return ret; | |
1013 | } | |
1014 | ||
c2066af0 | 1015 | blk_root_drained_begin(blk->root); |
b7d17f9f | 1016 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 1017 | blk_root_drained_end(blk->root); |
5bd51196 | 1018 | return ret; |
4be74634 MA |
1019 | } |
1020 | ||
d004bd52 EB |
1021 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1022 | int count, BdrvRequestFlags flags) | |
0df89e8e | 1023 | { |
983a1600 EB |
1024 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
1025 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
1026 | } |
1027 | ||
720ff280 KW |
1028 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1029 | { | |
1030 | return bdrv_make_zero(blk->root, flags); | |
1031 | } | |
1032 | ||
e7f7d676 HR |
1033 | static void error_callback_bh(void *opaque) |
1034 | { | |
1035 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 PB |
1036 | |
1037 | bdrv_dec_in_flight(acb->common.bs); | |
e7f7d676 HR |
1038 | acb->common.cb(acb->common.opaque, acb->ret); |
1039 | qemu_aio_unref(acb); | |
1040 | } | |
1041 | ||
ca78ecfa PL |
1042 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1043 | BlockCompletionFunc *cb, | |
1044 | void *opaque, int ret) | |
e7f7d676 HR |
1045 | { |
1046 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 1047 | |
99723548 | 1048 | bdrv_inc_in_flight(blk_bs(blk)); |
e7f7d676 | 1049 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1050 | acb->blk = blk; |
e7f7d676 HR |
1051 | acb->ret = ret; |
1052 | ||
fffb6e12 | 1053 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
1054 | return &acb->common; |
1055 | } | |
1056 | ||
57d6a428 KW |
1057 | typedef struct BlkAioEmAIOCB { |
1058 | BlockAIOCB common; | |
1059 | BlkRwCo rwco; | |
7fa84cd8 | 1060 | int bytes; |
57d6a428 | 1061 | bool has_returned; |
57d6a428 KW |
1062 | } BlkAioEmAIOCB; |
1063 | ||
1064 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1065 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1066 | }; | |
1067 | ||
1068 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1069 | { | |
57d6a428 | 1070 | if (acb->has_returned) { |
99723548 | 1071 | bdrv_dec_in_flight(acb->common.bs); |
57d6a428 KW |
1072 | acb->common.cb(acb->common.opaque, acb->rwco.ret); |
1073 | qemu_aio_unref(acb); | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | static void blk_aio_complete_bh(void *opaque) | |
1078 | { | |
fffb6e12 | 1079 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1080 | assert(acb->has_returned); |
1081 | blk_aio_complete(acb); | |
57d6a428 KW |
1082 | } |
1083 | ||
7fa84cd8 | 1084 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
1085 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
1086 | BdrvRequestFlags flags, | |
1087 | BlockCompletionFunc *cb, void *opaque) | |
1088 | { | |
1089 | BlkAioEmAIOCB *acb; | |
1090 | Coroutine *co; | |
1091 | ||
99723548 | 1092 | bdrv_inc_in_flight(blk_bs(blk)); |
57d6a428 KW |
1093 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1094 | acb->rwco = (BlkRwCo) { | |
1095 | .blk = blk, | |
1096 | .offset = offset, | |
1097 | .qiov = qiov, | |
1098 | .flags = flags, | |
1099 | .ret = NOT_DONE, | |
1100 | }; | |
7fa84cd8 | 1101 | acb->bytes = bytes; |
57d6a428 KW |
1102 | acb->has_returned = false; |
1103 | ||
0b8b8753 PB |
1104 | co = qemu_coroutine_create(co_entry, acb); |
1105 | qemu_coroutine_enter(co); | |
57d6a428 KW |
1106 | |
1107 | acb->has_returned = true; | |
1108 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1109 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1110 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1111 | } |
1112 | ||
1113 | return &acb->common; | |
1114 | } | |
1115 | ||
1116 | static void blk_aio_read_entry(void *opaque) | |
1117 | { | |
1118 | BlkAioEmAIOCB *acb = opaque; | |
1119 | BlkRwCo *rwco = &acb->rwco; | |
1120 | ||
7fa84cd8 KW |
1121 | assert(rwco->qiov->size == acb->bytes); |
1122 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1123 | rwco->qiov, rwco->flags); |
1124 | blk_aio_complete(acb); | |
1125 | } | |
1126 | ||
1127 | static void blk_aio_write_entry(void *opaque) | |
1128 | { | |
1129 | BlkAioEmAIOCB *acb = opaque; | |
1130 | BlkRwCo *rwco = &acb->rwco; | |
1131 | ||
7fa84cd8 KW |
1132 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
1133 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1134 | rwco->qiov, rwco->flags); |
1135 | blk_aio_complete(acb); | |
1136 | } | |
1137 | ||
d004bd52 EB |
1138 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1139 | int count, BdrvRequestFlags flags, | |
1140 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1141 | { |
983a1600 EB |
1142 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1143 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1144 | } |
1145 | ||
1146 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1147 | { | |
a55d3fba | 1148 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1149 | if (ret < 0) { |
1150 | return ret; | |
1151 | } | |
a55d3fba | 1152 | return count; |
4be74634 MA |
1153 | } |
1154 | ||
8341f00d EB |
1155 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1156 | BdrvRequestFlags flags) | |
4be74634 | 1157 | { |
8341f00d EB |
1158 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1159 | flags); | |
e7f7d676 HR |
1160 | if (ret < 0) { |
1161 | return ret; | |
1162 | } | |
a55d3fba | 1163 | return count; |
4be74634 MA |
1164 | } |
1165 | ||
1166 | int64_t blk_getlength(BlockBackend *blk) | |
1167 | { | |
c09ba36c HR |
1168 | if (!blk_is_available(blk)) { |
1169 | return -ENOMEDIUM; | |
1170 | } | |
1171 | ||
f21d96d0 | 1172 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1173 | } |
1174 | ||
1175 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1176 | { | |
f21d96d0 | 1177 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1178 | *nb_sectors_ptr = 0; |
1179 | } else { | |
f21d96d0 | 1180 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1181 | } |
4be74634 MA |
1182 | } |
1183 | ||
1ef01253 HR |
1184 | int64_t blk_nb_sectors(BlockBackend *blk) |
1185 | { | |
c09ba36c HR |
1186 | if (!blk_is_available(blk)) { |
1187 | return -ENOMEDIUM; | |
1188 | } | |
1189 | ||
f21d96d0 | 1190 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1191 | } |
1192 | ||
60cb2fa7 EB |
1193 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1194 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1195 | BlockCompletionFunc *cb, void *opaque) | |
1196 | { | |
1197 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1198 | blk_aio_read_entry, flags, cb, opaque); | |
1199 | } | |
1200 | ||
60cb2fa7 EB |
1201 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1202 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1203 | BlockCompletionFunc *cb, void *opaque) | |
1204 | { | |
1205 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1206 | blk_aio_write_entry, flags, cb, opaque); | |
1207 | } | |
1208 | ||
be07a889 KW |
1209 | static void blk_aio_flush_entry(void *opaque) |
1210 | { | |
1211 | BlkAioEmAIOCB *acb = opaque; | |
1212 | BlkRwCo *rwco = &acb->rwco; | |
1213 | ||
1214 | rwco->ret = blk_co_flush(rwco->blk); | |
1215 | blk_aio_complete(acb); | |
1216 | } | |
1217 | ||
4be74634 MA |
1218 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1219 | BlockCompletionFunc *cb, void *opaque) | |
1220 | { | |
be07a889 | 1221 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1222 | } |
1223 | ||
8c2e3dd5 KW |
1224 | static void blk_aio_pdiscard_entry(void *opaque) |
1225 | { | |
1226 | BlkAioEmAIOCB *acb = opaque; | |
1227 | BlkRwCo *rwco = &acb->rwco; | |
1228 | ||
1229 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1230 | blk_aio_complete(acb); | |
1231 | } | |
1232 | ||
1c6c4bb7 EB |
1233 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
1234 | int64_t offset, int count, | |
1235 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1236 | { |
8c2e3dd5 KW |
1237 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_pdiscard_entry, 0, |
1238 | cb, opaque); | |
4be74634 MA |
1239 | } |
1240 | ||
1241 | void blk_aio_cancel(BlockAIOCB *acb) | |
1242 | { | |
1243 | bdrv_aio_cancel(acb); | |
1244 | } | |
1245 | ||
1246 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1247 | { | |
1248 | bdrv_aio_cancel_async(acb); | |
1249 | } | |
1250 | ||
48af776a | 1251 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1252 | { |
c09ba36c HR |
1253 | if (!blk_is_available(blk)) { |
1254 | return -ENOMEDIUM; | |
1255 | } | |
1256 | ||
48af776a KW |
1257 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1258 | } | |
1259 | ||
1260 | static void blk_ioctl_entry(void *opaque) | |
1261 | { | |
1262 | BlkRwCo *rwco = opaque; | |
1263 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1264 | rwco->qiov->iov[0].iov_base); | |
1265 | } | |
1266 | ||
1267 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1268 | { | |
1269 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1270 | } | |
1271 | ||
1272 | static void blk_aio_ioctl_entry(void *opaque) | |
1273 | { | |
1274 | BlkAioEmAIOCB *acb = opaque; | |
1275 | BlkRwCo *rwco = &acb->rwco; | |
1276 | ||
1277 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1278 | rwco->qiov->iov[0].iov_base); | |
1279 | blk_aio_complete(acb); | |
4be74634 MA |
1280 | } |
1281 | ||
1282 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1283 | BlockCompletionFunc *cb, void *opaque) | |
1284 | { | |
48af776a KW |
1285 | QEMUIOVector qiov; |
1286 | struct iovec iov; | |
1287 | ||
1288 | iov = (struct iovec) { | |
1289 | .iov_base = buf, | |
1290 | .iov_len = 0, | |
1291 | }; | |
1292 | qemu_iovec_init_external(&qiov, &iov, 1); | |
c09ba36c | 1293 | |
48af776a | 1294 | return blk_aio_prwv(blk, req, 0, &qiov, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1295 | } |
1296 | ||
1c6c4bb7 | 1297 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count) |
2bb0dce7 | 1298 | { |
1c6c4bb7 | 1299 | int ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1300 | if (ret < 0) { |
1301 | return ret; | |
1302 | } | |
1303 | ||
1c6c4bb7 | 1304 | return bdrv_co_pdiscard(blk_bs(blk), offset, count); |
2bb0dce7 HR |
1305 | } |
1306 | ||
1307 | int blk_co_flush(BlockBackend *blk) | |
1308 | { | |
c09ba36c HR |
1309 | if (!blk_is_available(blk)) { |
1310 | return -ENOMEDIUM; | |
1311 | } | |
1312 | ||
f21d96d0 | 1313 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1314 | } |
1315 | ||
be07a889 | 1316 | static void blk_flush_entry(void *opaque) |
4be74634 | 1317 | { |
be07a889 KW |
1318 | BlkRwCo *rwco = opaque; |
1319 | rwco->ret = blk_co_flush(rwco->blk); | |
1320 | } | |
c09ba36c | 1321 | |
be07a889 KW |
1322 | int blk_flush(BlockBackend *blk) |
1323 | { | |
1324 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1325 | } |
1326 | ||
97b0385a AY |
1327 | void blk_drain(BlockBackend *blk) |
1328 | { | |
f21d96d0 KW |
1329 | if (blk_bs(blk)) { |
1330 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1331 | } |
97b0385a AY |
1332 | } |
1333 | ||
4be74634 MA |
1334 | void blk_drain_all(void) |
1335 | { | |
1336 | bdrv_drain_all(); | |
1337 | } | |
1338 | ||
373340b2 HR |
1339 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1340 | BlockdevOnError on_write_error) | |
1341 | { | |
1342 | blk->on_read_error = on_read_error; | |
1343 | blk->on_write_error = on_write_error; | |
1344 | } | |
1345 | ||
4be74634 MA |
1346 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1347 | { | |
373340b2 | 1348 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1349 | } |
1350 | ||
1351 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1352 | int error) | |
1353 | { | |
373340b2 HR |
1354 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1355 | ||
1356 | switch (on_err) { | |
1357 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1358 | return (error == ENOSPC) ? | |
1359 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1360 | case BLOCKDEV_ON_ERROR_STOP: | |
1361 | return BLOCK_ERROR_ACTION_STOP; | |
1362 | case BLOCKDEV_ON_ERROR_REPORT: | |
1363 | return BLOCK_ERROR_ACTION_REPORT; | |
1364 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1365 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1366 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1367 | default: |
1368 | abort(); | |
1369 | } | |
4be74634 MA |
1370 | } |
1371 | ||
373340b2 HR |
1372 | static void send_qmp_error_event(BlockBackend *blk, |
1373 | BlockErrorAction action, | |
1374 | bool is_read, int error) | |
1375 | { | |
1376 | IoOperationType optype; | |
1377 | ||
1378 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
2bf7e10f KW |
1379 | qapi_event_send_block_io_error(blk_name(blk), |
1380 | bdrv_get_node_name(blk_bs(blk)), optype, | |
1381 | action, blk_iostatus_is_enabled(blk), | |
373340b2 HR |
1382 | error == ENOSPC, strerror(error), |
1383 | &error_abort); | |
1384 | } | |
1385 | ||
1386 | /* This is done by device models because, while the block layer knows | |
1387 | * about the error, it does not know whether an operation comes from | |
1388 | * the device or the block layer (from a job, for example). | |
1389 | */ | |
4be74634 MA |
1390 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1391 | bool is_read, int error) | |
1392 | { | |
373340b2 HR |
1393 | assert(error >= 0); |
1394 | ||
1395 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1396 | /* First set the iostatus, so that "info block" returns an iostatus | |
1397 | * that matches the events raised so far (an additional error iostatus | |
1398 | * is fine, but not a lost one). | |
1399 | */ | |
1400 | blk_iostatus_set_err(blk, error); | |
1401 | ||
1402 | /* Then raise the request to stop the VM and the event. | |
1403 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1404 | * it ensures that the STOP event always comes after the | |
1405 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1406 | * can observe the STOP event and do a "cont" before the STOP | |
1407 | * event is issued, the VM will not stop. In this case, vm_start() | |
1408 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1409 | */ | |
1410 | qemu_system_vmstop_request_prepare(); | |
1411 | send_qmp_error_event(blk, action, is_read, error); | |
1412 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1413 | } else { | |
1414 | send_qmp_error_event(blk, action, is_read, error); | |
1415 | } | |
4be74634 MA |
1416 | } |
1417 | ||
1418 | int blk_is_read_only(BlockBackend *blk) | |
1419 | { | |
f21d96d0 KW |
1420 | BlockDriverState *bs = blk_bs(blk); |
1421 | ||
1422 | if (bs) { | |
1423 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1424 | } else { |
1425 | return blk->root_state.read_only; | |
1426 | } | |
4be74634 MA |
1427 | } |
1428 | ||
1429 | int blk_is_sg(BlockBackend *blk) | |
1430 | { | |
f21d96d0 KW |
1431 | BlockDriverState *bs = blk_bs(blk); |
1432 | ||
1433 | if (!bs) { | |
a46fc9c9 HR |
1434 | return 0; |
1435 | } | |
1436 | ||
f21d96d0 | 1437 | return bdrv_is_sg(bs); |
4be74634 MA |
1438 | } |
1439 | ||
1440 | int blk_enable_write_cache(BlockBackend *blk) | |
1441 | { | |
bfd18d1e | 1442 | return blk->enable_write_cache; |
4be74634 MA |
1443 | } |
1444 | ||
1445 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1446 | { | |
bfd18d1e | 1447 | blk->enable_write_cache = wce; |
4be74634 MA |
1448 | } |
1449 | ||
2bb0dce7 HR |
1450 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1451 | { | |
f21d96d0 KW |
1452 | BlockDriverState *bs = blk_bs(blk); |
1453 | ||
1454 | if (!bs) { | |
c09ba36c HR |
1455 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1456 | return; | |
1457 | } | |
1458 | ||
f21d96d0 | 1459 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1460 | } |
1461 | ||
e031f750 | 1462 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1463 | { |
f21d96d0 KW |
1464 | BlockDriverState *bs = blk_bs(blk); |
1465 | ||
1466 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1467 | } |
1468 | ||
1469 | bool blk_is_available(BlockBackend *blk) | |
1470 | { | |
1471 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1472 | } |
1473 | ||
1474 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1475 | { | |
f21d96d0 KW |
1476 | BlockDriverState *bs = blk_bs(blk); |
1477 | ||
1478 | if (bs) { | |
1479 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1480 | } |
4be74634 MA |
1481 | } |
1482 | ||
1483 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1484 | { | |
f21d96d0 | 1485 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1486 | char *id; |
1487 | ||
1488 | /* blk_eject is only called by qdevified devices */ | |
1489 | assert(!blk->legacy_dev); | |
f21d96d0 KW |
1490 | |
1491 | if (bs) { | |
1492 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1493 | } |
c47ee043 JS |
1494 | |
1495 | /* Whether or not we ejected on the backend, | |
1496 | * the frontend experienced a tray event. */ | |
1497 | id = blk_get_attached_dev_id(blk); | |
1498 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
1499 | eject_flag, &error_abort); | |
1500 | g_free(id); | |
4be74634 MA |
1501 | } |
1502 | ||
1503 | int blk_get_flags(BlockBackend *blk) | |
1504 | { | |
f21d96d0 KW |
1505 | BlockDriverState *bs = blk_bs(blk); |
1506 | ||
1507 | if (bs) { | |
1508 | return bdrv_get_flags(bs); | |
061959e8 HR |
1509 | } else { |
1510 | return blk->root_state.open_flags; | |
1511 | } | |
4be74634 MA |
1512 | } |
1513 | ||
5def6b80 EB |
1514 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1515 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1516 | { |
f21d96d0 | 1517 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1518 | uint32_t max = 0; |
f21d96d0 KW |
1519 | |
1520 | if (bs) { | |
5def6b80 | 1521 | max = bs->bl.max_transfer; |
a46fc9c9 | 1522 | } |
5def6b80 | 1523 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1524 | } |
1525 | ||
648296e0 SH |
1526 | int blk_get_max_iov(BlockBackend *blk) |
1527 | { | |
f21d96d0 | 1528 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1529 | } |
1530 | ||
4be74634 MA |
1531 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1532 | { | |
68e9ec01 | 1533 | blk->guest_block_size = align; |
4be74634 MA |
1534 | } |
1535 | ||
f1c17521 PB |
1536 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1537 | { | |
f21d96d0 | 1538 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1539 | } |
1540 | ||
4be74634 MA |
1541 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1542 | { | |
f21d96d0 | 1543 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1544 | } |
1545 | ||
1546 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1547 | { | |
f21d96d0 KW |
1548 | BlockDriverState *bs = blk_bs(blk); |
1549 | ||
1550 | if (!bs) { | |
a46fc9c9 HR |
1551 | return false; |
1552 | } | |
1553 | ||
f21d96d0 | 1554 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1555 | } |
1556 | ||
1557 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1558 | { | |
f21d96d0 KW |
1559 | BlockDriverState *bs = blk_bs(blk); |
1560 | ||
1561 | if (bs) { | |
1562 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1563 | } |
4be74634 MA |
1564 | } |
1565 | ||
1566 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1567 | { | |
f21d96d0 KW |
1568 | BlockDriverState *bs = blk_bs(blk); |
1569 | ||
1570 | if (bs) { | |
1571 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1572 | } |
4be74634 MA |
1573 | } |
1574 | ||
1575 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1576 | { | |
f21d96d0 KW |
1577 | BlockDriverState *bs = blk_bs(blk); |
1578 | ||
1579 | if (bs) { | |
1580 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1581 | } |
4be74634 MA |
1582 | } |
1583 | ||
1584 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1585 | { | |
f21d96d0 KW |
1586 | BlockDriverState *bs = blk_bs(blk); |
1587 | ||
1588 | if (bs) { | |
1589 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1590 | } else { |
1591 | return qemu_get_aio_context(); | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1596 | { | |
1597 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1598 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1599 | } |
1600 | ||
1601 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1602 | { | |
f21d96d0 KW |
1603 | BlockDriverState *bs = blk_bs(blk); |
1604 | ||
1605 | if (bs) { | |
7ca7f0f6 KW |
1606 | if (blk->public.throttle_state) { |
1607 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); | |
1608 | } | |
f21d96d0 | 1609 | bdrv_set_aio_context(bs, new_context); |
7ca7f0f6 KW |
1610 | if (blk->public.throttle_state) { |
1611 | throttle_timers_attach_aio_context(&blk->public.throttle_timers, | |
1612 | new_context); | |
1613 | } | |
a46fc9c9 | 1614 | } |
4be74634 MA |
1615 | } |
1616 | ||
2019ba0a HR |
1617 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1618 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1619 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1620 | { | |
f21d96d0 KW |
1621 | BlockDriverState *bs = blk_bs(blk); |
1622 | ||
1623 | if (bs) { | |
1624 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1625 | detach_aio_context, opaque); |
1626 | } | |
2019ba0a HR |
1627 | } |
1628 | ||
1629 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1630 | void (*attached_aio_context)(AioContext *, | |
1631 | void *), | |
1632 | void (*detach_aio_context)(void *), | |
1633 | void *opaque) | |
1634 | { | |
f21d96d0 KW |
1635 | BlockDriverState *bs = blk_bs(blk); |
1636 | ||
1637 | if (bs) { | |
1638 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1639 | detach_aio_context, opaque); |
1640 | } | |
2019ba0a HR |
1641 | } |
1642 | ||
3301f6c6 HR |
1643 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1644 | { | |
1645 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1646 | } | |
1647 | ||
1648 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1649 | { | |
1650 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1651 | } | |
1652 | ||
4be74634 MA |
1653 | void blk_io_plug(BlockBackend *blk) |
1654 | { | |
f21d96d0 KW |
1655 | BlockDriverState *bs = blk_bs(blk); |
1656 | ||
1657 | if (bs) { | |
1658 | bdrv_io_plug(bs); | |
a46fc9c9 | 1659 | } |
4be74634 MA |
1660 | } |
1661 | ||
1662 | void blk_io_unplug(BlockBackend *blk) | |
1663 | { | |
f21d96d0 KW |
1664 | BlockDriverState *bs = blk_bs(blk); |
1665 | ||
1666 | if (bs) { | |
1667 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1668 | } |
4be74634 MA |
1669 | } |
1670 | ||
1671 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1672 | { | |
7f0e9da6 | 1673 | return &blk->stats; |
4be74634 MA |
1674 | } |
1675 | ||
1676 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1677 | BlockCompletionFunc *cb, void *opaque) | |
1678 | { | |
1679 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1680 | } | |
1ef01253 | 1681 | |
d004bd52 EB |
1682 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1683 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1684 | { |
983a1600 | 1685 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1686 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1687 | } |
1688 | ||
fe5c1355 PB |
1689 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1690 | int count) | |
1ef01253 | 1691 | { |
35fadca8 PB |
1692 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1693 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
1694 | } |
1695 | ||
1696 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1697 | { | |
c09ba36c HR |
1698 | if (!blk_is_available(blk)) { |
1699 | return -ENOMEDIUM; | |
1700 | } | |
1701 | ||
52cdbc58 | 1702 | return bdrv_truncate(blk->root, offset); |
1ef01253 HR |
1703 | } |
1704 | ||
8c2e3dd5 | 1705 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 1706 | { |
8c2e3dd5 KW |
1707 | BlkRwCo *rwco = opaque; |
1708 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, rwco->qiov->size); | |
1709 | } | |
e7f7d676 | 1710 | |
8c2e3dd5 KW |
1711 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int count) |
1712 | { | |
1713 | return blk_prw(blk, offset, NULL, count, blk_pdiscard_entry, 0); | |
1ef01253 HR |
1714 | } |
1715 | ||
1716 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1717 | int64_t pos, int size) | |
1718 | { | |
bfd18d1e KW |
1719 | int ret; |
1720 | ||
c09ba36c HR |
1721 | if (!blk_is_available(blk)) { |
1722 | return -ENOMEDIUM; | |
1723 | } | |
1724 | ||
bfd18d1e KW |
1725 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1726 | if (ret < 0) { | |
1727 | return ret; | |
1728 | } | |
1729 | ||
1730 | if (ret == size && !blk->enable_write_cache) { | |
1731 | ret = bdrv_flush(blk_bs(blk)); | |
1732 | } | |
1733 | ||
1734 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1735 | } |
1736 | ||
1737 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1738 | { | |
c09ba36c HR |
1739 | if (!blk_is_available(blk)) { |
1740 | return -ENOMEDIUM; | |
1741 | } | |
1742 | ||
f21d96d0 | 1743 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1744 | } |
f0272c4d ET |
1745 | |
1746 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1747 | { | |
c09ba36c HR |
1748 | if (!blk_is_available(blk)) { |
1749 | return -ENOMEDIUM; | |
1750 | } | |
1751 | ||
f21d96d0 | 1752 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1753 | } |
1754 | ||
1755 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1756 | { | |
c09ba36c HR |
1757 | if (!blk_is_available(blk)) { |
1758 | return -ENOMEDIUM; | |
1759 | } | |
1760 | ||
f21d96d0 | 1761 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1762 | } |
281d22d8 HR |
1763 | |
1764 | /* | |
1765 | * Updates the BlockBackendRootState object with data from the currently | |
1766 | * attached BlockDriverState. | |
1767 | */ | |
1768 | void blk_update_root_state(BlockBackend *blk) | |
1769 | { | |
f21d96d0 | 1770 | assert(blk->root); |
281d22d8 | 1771 | |
f21d96d0 KW |
1772 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1773 | blk->root_state.read_only = blk->root->bs->read_only; | |
1774 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1775 | } |
1776 | ||
38cb18f5 | 1777 | /* |
b85114f8 KW |
1778 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
1779 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 1780 | */ |
b85114f8 | 1781 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 1782 | { |
b85114f8 | 1783 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
1784 | } |
1785 | ||
1786 | /* | |
1787 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1788 | * supposed to inherit the root state. | |
1789 | */ | |
1790 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1791 | { | |
1792 | int bs_flags; | |
1793 | ||
1794 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1795 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1796 | ||
1797 | return bs_flags; | |
1798 | } | |
1799 | ||
281d22d8 HR |
1800 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1801 | { | |
1802 | return &blk->root_state; | |
1803 | } | |
1393f212 HR |
1804 | |
1805 | int blk_commit_all(void) | |
1806 | { | |
fe1a9cbc HR |
1807 | BlockBackend *blk = NULL; |
1808 | ||
1809 | while ((blk = blk_all_next(blk)) != NULL) { | |
1810 | AioContext *aio_context = blk_get_aio_context(blk); | |
1811 | ||
1812 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1813 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1814 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1815 | if (ret < 0) { |
1816 | aio_context_release(aio_context); | |
1817 | return ret; | |
1818 | } | |
1819 | } | |
1820 | aio_context_release(aio_context); | |
1821 | } | |
1822 | return 0; | |
1823 | } | |
1824 | ||
97148076 KW |
1825 | |
1826 | /* throttling disk I/O limits */ | |
1827 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
1828 | { | |
1829 | throttle_group_config(blk, cfg); | |
1830 | } | |
1831 | ||
1832 | void blk_io_limits_disable(BlockBackend *blk) | |
1833 | { | |
1834 | assert(blk->public.throttle_state); | |
c2066af0 | 1835 | bdrv_drained_begin(blk_bs(blk)); |
97148076 | 1836 | throttle_group_unregister_blk(blk); |
c2066af0 | 1837 | bdrv_drained_end(blk_bs(blk)); |
97148076 KW |
1838 | } |
1839 | ||
1840 | /* should be called before blk_set_io_limits if a limit is set */ | |
1841 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
1842 | { | |
1843 | assert(!blk->public.throttle_state); | |
1844 | throttle_group_register_blk(blk, group); | |
1845 | } | |
1846 | ||
1847 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
1848 | { | |
1849 | /* this BB is not part of any group */ | |
1850 | if (!blk->public.throttle_state) { | |
1851 | return; | |
1852 | } | |
1853 | ||
1854 | /* this BB is a part of the same group than the one we want */ | |
1855 | if (!g_strcmp0(throttle_group_get_name(blk), group)) { | |
1856 | return; | |
1857 | } | |
1858 | ||
1859 | /* need to change the group this bs belong to */ | |
1860 | blk_io_limits_disable(blk); | |
1861 | blk_io_limits_enable(blk, group); | |
1862 | } | |
c2066af0 KW |
1863 | |
1864 | static void blk_root_drained_begin(BdrvChild *child) | |
1865 | { | |
1866 | BlockBackend *blk = child->opaque; | |
1867 | ||
36fe1331 KW |
1868 | /* Note that blk->root may not be accessible here yet if we are just |
1869 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
1870 | ||
c2066af0 KW |
1871 | if (blk->public.io_limits_disabled++ == 0) { |
1872 | throttle_group_restart_blk(blk); | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | static void blk_root_drained_end(BdrvChild *child) | |
1877 | { | |
1878 | BlockBackend *blk = child->opaque; | |
1879 | ||
1880 | assert(blk->public.io_limits_disabled); | |
1881 | --blk->public.io_limits_disabled; | |
1882 | } |