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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); |
8fb3c76c | 83 | |
2cf22d6a HR |
84 | /* All BlockBackends */ |
85 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
86 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
87 | ||
9492b0b9 HR |
88 | /* All BlockBackends referenced by the monitor and which are iterated through by |
89 | * blk_next() */ | |
90 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
91 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 92 | |
f21d96d0 KW |
93 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
94 | int parent_flags, QDict *parent_options) | |
95 | { | |
96 | /* We're not supposed to call this function for root nodes */ | |
97 | abort(); | |
98 | } | |
c2066af0 KW |
99 | static void blk_root_drained_begin(BdrvChild *child); |
100 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 | 101 | |
5c8cab48 KW |
102 | static void blk_root_change_media(BdrvChild *child, bool load); |
103 | static void blk_root_resize(BdrvChild *child); | |
104 | ||
4c265bf9 KW |
105 | static const char *blk_root_get_name(BdrvChild *child) |
106 | { | |
107 | return blk_name(child->opaque); | |
108 | } | |
109 | ||
f21d96d0 | 110 | static const BdrvChildRole child_root = { |
c2066af0 KW |
111 | .inherit_options = blk_root_inherit_options, |
112 | ||
5c8cab48 KW |
113 | .change_media = blk_root_change_media, |
114 | .resize = blk_root_resize, | |
4c265bf9 | 115 | .get_name = blk_root_get_name, |
5c8cab48 | 116 | |
c2066af0 KW |
117 | .drained_begin = blk_root_drained_begin, |
118 | .drained_end = blk_root_drained_end, | |
f21d96d0 KW |
119 | }; |
120 | ||
26f54e9a | 121 | /* |
efaa7c4e | 122 | * Create a new BlockBackend with a reference count of one. |
26f54e9a MA |
123 | * Store an error through @errp on failure, unless it's null. |
124 | * Return the new BlockBackend on success, null on failure. | |
125 | */ | |
109525ad | 126 | BlockBackend *blk_new(void) |
26f54e9a MA |
127 | { |
128 | BlockBackend *blk; | |
129 | ||
26f54e9a | 130 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 131 | blk->refcnt = 1; |
981776b3 KW |
132 | blk->perm = 0; |
133 | blk->shared_perm = BLK_PERM_ALL; | |
0c3169df KW |
134 | blk_set_enable_write_cache(blk, true); |
135 | ||
27ccdd52 KW |
136 | qemu_co_queue_init(&blk->public.throttled_reqs[0]); |
137 | qemu_co_queue_init(&blk->public.throttled_reqs[1]); | |
138 | ||
3301f6c6 HR |
139 | notifier_list_init(&blk->remove_bs_notifiers); |
140 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 141 | |
2cf22d6a | 142 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
143 | return blk; |
144 | } | |
145 | ||
7e7d56d9 | 146 | /* |
28eb9b12 | 147 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
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; | |
28eb9b12 | 162 | BlockDriverState *bs; |
ca49a4fd | 163 | |
109525ad | 164 | blk = blk_new(); |
5b363937 HR |
165 | bs = bdrv_open(filename, reference, options, flags, errp); |
166 | if (!bs) { | |
ca49a4fd HR |
167 | blk_unref(blk); |
168 | return NULL; | |
169 | } | |
170 | ||
d5e6f437 KW |
171 | /* FIXME Use real permissions */ |
172 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, | |
173 | 0, BLK_PERM_ALL, blk, &error_abort); | |
72e775c7 | 174 | |
ca49a4fd HR |
175 | return blk; |
176 | } | |
177 | ||
26f54e9a MA |
178 | static void blk_delete(BlockBackend *blk) |
179 | { | |
180 | assert(!blk->refcnt); | |
e5e78550 | 181 | assert(!blk->name); |
a7f53e26 | 182 | assert(!blk->dev); |
f21d96d0 | 183 | if (blk->root) { |
13855c6b | 184 | blk_remove_bs(blk); |
7e7d56d9 | 185 | } |
3301f6c6 HR |
186 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
187 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
2cf22d6a | 188 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 189 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 190 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
191 | g_free(blk); |
192 | } | |
193 | ||
8fb3c76c MA |
194 | static void drive_info_del(DriveInfo *dinfo) |
195 | { | |
196 | if (!dinfo) { | |
197 | return; | |
198 | } | |
199 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
200 | g_free(dinfo->serial); |
201 | g_free(dinfo); | |
202 | } | |
203 | ||
f636ae85 AG |
204 | int blk_get_refcnt(BlockBackend *blk) |
205 | { | |
206 | return blk ? blk->refcnt : 0; | |
207 | } | |
208 | ||
26f54e9a MA |
209 | /* |
210 | * Increment @blk's reference count. | |
211 | * @blk must not be null. | |
212 | */ | |
213 | void blk_ref(BlockBackend *blk) | |
214 | { | |
215 | blk->refcnt++; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Decrement @blk's reference count. | |
220 | * If this drops it to zero, destroy @blk. | |
221 | * For convenience, do nothing if @blk is null. | |
222 | */ | |
223 | void blk_unref(BlockBackend *blk) | |
224 | { | |
225 | if (blk) { | |
226 | assert(blk->refcnt > 0); | |
227 | if (!--blk->refcnt) { | |
228 | blk_delete(blk); | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
2cf22d6a HR |
233 | /* |
234 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
235 | * ones which are hidden (i.e. are not referenced by the monitor). | |
236 | */ | |
237 | static BlockBackend *blk_all_next(BlockBackend *blk) | |
238 | { | |
239 | return blk ? QTAILQ_NEXT(blk, link) | |
240 | : QTAILQ_FIRST(&block_backends); | |
241 | } | |
242 | ||
d8da3cef HR |
243 | void blk_remove_all_bs(void) |
244 | { | |
74d1b8fc | 245 | BlockBackend *blk = NULL; |
d8da3cef | 246 | |
2cf22d6a | 247 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
248 | AioContext *ctx = blk_get_aio_context(blk); |
249 | ||
250 | aio_context_acquire(ctx); | |
f21d96d0 | 251 | if (blk->root) { |
d8da3cef HR |
252 | blk_remove_bs(blk); |
253 | } | |
254 | aio_context_release(ctx); | |
255 | } | |
256 | } | |
257 | ||
26f54e9a | 258 | /* |
9492b0b9 | 259 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
260 | * If @blk is null, return the first one. |
261 | * Else, return @blk's next sibling, which may be null. | |
262 | * | |
263 | * To iterate over all BlockBackends, do | |
264 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
265 | * ... | |
266 | * } | |
267 | */ | |
268 | BlockBackend *blk_next(BlockBackend *blk) | |
269 | { | |
9492b0b9 HR |
270 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
271 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
272 | } |
273 | ||
7c8eece4 KW |
274 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
275 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 276 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 277 | { |
88be7b4b | 278 | BlockDriverState *bs; |
981f4f57 | 279 | |
7c8eece4 KW |
280 | /* First, return all root nodes of BlockBackends. In order to avoid |
281 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
282 | * if the BB is the first one in the parent list of the BDS. */ | |
283 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
284 | do { | |
285 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
286 | bs = it->blk ? blk_bs(it->blk) : NULL; |
287 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 288 | |
88be7b4b KW |
289 | if (bs) { |
290 | return bs; | |
7c8eece4 KW |
291 | } |
292 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
293 | } | |
294 | ||
295 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
296 | * BDSes that are attached to a BlockBackend here; they have been handled | |
297 | * by the above block already */ | |
981f4f57 | 298 | do { |
7c8eece4 | 299 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
300 | bs = it->bs; |
301 | } while (bs && bdrv_has_blk(bs)); | |
302 | ||
303 | return bs; | |
304 | } | |
305 | ||
306 | BlockDriverState *bdrv_first(BdrvNextIterator *it) | |
307 | { | |
308 | *it = (BdrvNextIterator) { | |
309 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
310 | }; | |
981f4f57 | 311 | |
88be7b4b | 312 | return bdrv_next(it); |
981f4f57 HR |
313 | } |
314 | ||
e5e78550 HR |
315 | /* |
316 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
317 | * the given @name acting as the handle for the monitor. | |
318 | * Strictly for use by blockdev.c. | |
319 | * | |
320 | * @name must not be null or empty. | |
321 | * | |
322 | * Returns true on success and false on failure. In the latter case, an Error | |
323 | * object is returned through @errp. | |
324 | */ | |
325 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
326 | { | |
327 | assert(!blk->name); | |
328 | assert(name && name[0]); | |
329 | ||
330 | if (!id_wellformed(name)) { | |
331 | error_setg(errp, "Invalid device name"); | |
332 | return false; | |
333 | } | |
334 | if (blk_by_name(name)) { | |
335 | error_setg(errp, "Device with id '%s' already exists", name); | |
336 | return false; | |
337 | } | |
338 | if (bdrv_find_node(name)) { | |
339 | error_setg(errp, | |
340 | "Device name '%s' conflicts with an existing node name", | |
341 | name); | |
342 | return false; | |
343 | } | |
344 | ||
345 | blk->name = g_strdup(name); | |
346 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
347 | return true; | |
348 | } | |
349 | ||
350 | /* | |
351 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
352 | * Strictly for use by blockdev.c. | |
353 | */ | |
354 | void monitor_remove_blk(BlockBackend *blk) | |
355 | { | |
356 | if (!blk->name) { | |
357 | return; | |
358 | } | |
359 | ||
360 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
361 | g_free(blk->name); | |
362 | blk->name = NULL; | |
363 | } | |
364 | ||
26f54e9a | 365 | /* |
7e7d56d9 | 366 | * Return @blk's name, a non-null string. |
e5e78550 | 367 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a MA |
368 | */ |
369 | const char *blk_name(BlockBackend *blk) | |
370 | { | |
e5e78550 | 371 | return blk->name ?: ""; |
26f54e9a MA |
372 | } |
373 | ||
374 | /* | |
375 | * Return the BlockBackend with name @name if it exists, else null. | |
376 | * @name must not be null. | |
377 | */ | |
378 | BlockBackend *blk_by_name(const char *name) | |
379 | { | |
74d1b8fc | 380 | BlockBackend *blk = NULL; |
26f54e9a MA |
381 | |
382 | assert(name); | |
74d1b8fc | 383 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
384 | if (!strcmp(name, blk->name)) { |
385 | return blk; | |
386 | } | |
387 | } | |
388 | return NULL; | |
389 | } | |
7e7d56d9 MA |
390 | |
391 | /* | |
392 | * Return the BlockDriverState attached to @blk if any, else null. | |
393 | */ | |
394 | BlockDriverState *blk_bs(BlockBackend *blk) | |
395 | { | |
f21d96d0 | 396 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
397 | } |
398 | ||
7c8eece4 | 399 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
400 | { |
401 | BdrvChild *child; | |
402 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
403 | if (child->role == &child_root) { | |
7c8eece4 | 404 | return child->opaque; |
dde33812 KW |
405 | } |
406 | } | |
407 | ||
7c8eece4 KW |
408 | return NULL; |
409 | } | |
410 | ||
411 | /* | |
412 | * Returns true if @bs has an associated BlockBackend. | |
413 | */ | |
414 | bool bdrv_has_blk(BlockDriverState *bs) | |
415 | { | |
416 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
417 | } |
418 | ||
b6c1bae5 KW |
419 | /* |
420 | * Returns true if @bs has only BlockBackends as parents. | |
421 | */ | |
422 | bool bdrv_is_root_node(BlockDriverState *bs) | |
423 | { | |
424 | BdrvChild *c; | |
425 | ||
426 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
427 | if (c->role != &child_root) { | |
428 | return false; | |
429 | } | |
430 | } | |
431 | ||
432 | return true; | |
433 | } | |
434 | ||
18e46a03 MA |
435 | /* |
436 | * Return @blk's DriveInfo if any, else null. | |
437 | */ | |
438 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
439 | { | |
440 | return blk->legacy_dinfo; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Set @blk's DriveInfo to @dinfo, and return it. | |
445 | * @blk must not have a DriveInfo set already. | |
446 | * No other BlockBackend may have the same DriveInfo set. | |
447 | */ | |
448 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
449 | { | |
450 | assert(!blk->legacy_dinfo); | |
451 | return blk->legacy_dinfo = dinfo; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Return the BlockBackend with DriveInfo @dinfo. | |
456 | * It must exist. | |
457 | */ | |
458 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
459 | { | |
74d1b8fc | 460 | BlockBackend *blk = NULL; |
18e46a03 | 461 | |
74d1b8fc | 462 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
463 | if (blk->legacy_dinfo == dinfo) { |
464 | return blk; | |
465 | } | |
466 | } | |
467 | abort(); | |
468 | } | |
469 | ||
f2cd875d KW |
470 | /* |
471 | * Returns a pointer to the publicly accessible fields of @blk. | |
472 | */ | |
473 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
474 | { | |
475 | return &blk->public; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Returns a BlockBackend given the associated @public fields. | |
480 | */ | |
481 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
482 | { | |
483 | return container_of(public, BlockBackend, public); | |
484 | } | |
485 | ||
1c95f7e1 HR |
486 | /* |
487 | * Disassociates the currently associated BlockDriverState from @blk. | |
488 | */ | |
489 | void blk_remove_bs(BlockBackend *blk) | |
490 | { | |
3301f6c6 | 491 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
27ccdd52 | 492 | if (blk->public.throttle_state) { |
7ca7f0f6 | 493 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); |
a5614993 | 494 | } |
1c95f7e1 | 495 | |
7ca7f0f6 KW |
496 | blk_update_root_state(blk); |
497 | ||
f21d96d0 KW |
498 | bdrv_root_unref_child(blk->root); |
499 | blk->root = NULL; | |
1c95f7e1 HR |
500 | } |
501 | ||
0c3c36d6 HR |
502 | /* |
503 | * Associates a new BlockDriverState with @blk. | |
504 | */ | |
505 | void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) | |
506 | { | |
0c3c36d6 | 507 | bdrv_ref(bs); |
d5e6f437 KW |
508 | /* FIXME Use real permissions */ |
509 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, | |
510 | 0, BLK_PERM_ALL, blk, &error_abort); | |
3301f6c6 HR |
511 | |
512 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
7ca7f0f6 KW |
513 | if (blk->public.throttle_state) { |
514 | throttle_timers_attach_aio_context( | |
515 | &blk->public.throttle_timers, bdrv_get_aio_context(bs)); | |
516 | } | |
0c3c36d6 HR |
517 | } |
518 | ||
981776b3 KW |
519 | /* |
520 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
521 | */ | |
522 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
523 | Error **errp) | |
524 | { | |
525 | int ret; | |
526 | ||
527 | if (blk->root) { | |
528 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); | |
529 | if (ret < 0) { | |
530 | return ret; | |
531 | } | |
532 | } | |
533 | ||
534 | blk->perm = perm; | |
535 | blk->shared_perm = shared_perm; | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
bbc8ea98 | 540 | static int blk_do_attach_dev(BlockBackend *blk, void *dev) |
4be74634 | 541 | { |
a7f53e26 MA |
542 | if (blk->dev) { |
543 | return -EBUSY; | |
544 | } | |
84ebe375 | 545 | blk_ref(blk); |
a7f53e26 | 546 | blk->dev = dev; |
bbc8ea98 | 547 | blk->legacy_dev = false; |
373340b2 | 548 | blk_iostatus_reset(blk); |
a7f53e26 | 549 | return 0; |
4be74634 MA |
550 | } |
551 | ||
bbc8ea98 KW |
552 | /* |
553 | * Attach device model @dev to @blk. | |
554 | * Return 0 on success, -EBUSY when a device model is attached already. | |
555 | */ | |
556 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
557 | { | |
558 | return blk_do_attach_dev(blk, dev); | |
559 | } | |
560 | ||
a7f53e26 MA |
561 | /* |
562 | * Attach device model @dev to @blk. | |
563 | * @blk must not have a device model attached already. | |
564 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
565 | */ | |
bbc8ea98 | 566 | void blk_attach_dev_legacy(BlockBackend *blk, void *dev) |
4be74634 | 567 | { |
bbc8ea98 | 568 | if (blk_do_attach_dev(blk, dev) < 0) { |
a7f53e26 MA |
569 | abort(); |
570 | } | |
bbc8ea98 | 571 | blk->legacy_dev = true; |
4be74634 MA |
572 | } |
573 | ||
a7f53e26 MA |
574 | /* |
575 | * Detach device model @dev from @blk. | |
576 | * @dev must be currently attached to @blk. | |
577 | */ | |
4be74634 | 578 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 579 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 580 | { |
a7f53e26 MA |
581 | assert(blk->dev == dev); |
582 | blk->dev = NULL; | |
583 | blk->dev_ops = NULL; | |
584 | blk->dev_opaque = NULL; | |
68e9ec01 | 585 | blk->guest_block_size = 512; |
981776b3 | 586 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 587 | blk_unref(blk); |
4be74634 MA |
588 | } |
589 | ||
a7f53e26 MA |
590 | /* |
591 | * Return the device model attached to @blk if any, else null. | |
592 | */ | |
4be74634 | 593 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
594 | /* TODO change to return DeviceState * when all users are qdevified */ |
595 | { | |
596 | return blk->dev; | |
597 | } | |
598 | ||
2d76e724 KW |
599 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
600 | * device attached to the BlockBackend. */ | |
601 | static char *blk_get_attached_dev_id(BlockBackend *blk) | |
602 | { | |
603 | DeviceState *dev; | |
604 | ||
605 | assert(!blk->legacy_dev); | |
606 | dev = blk->dev; | |
607 | ||
608 | if (!dev) { | |
609 | return g_strdup(""); | |
610 | } else if (dev->id) { | |
611 | return g_strdup(dev->id); | |
612 | } | |
613 | return object_get_canonical_path(OBJECT(dev)); | |
614 | } | |
615 | ||
1c89e1fa KW |
616 | /* |
617 | * Return the BlockBackend which has the device model @dev attached if it | |
618 | * exists, else null. | |
619 | * | |
620 | * @dev must not be null. | |
621 | */ | |
622 | BlockBackend *blk_by_dev(void *dev) | |
623 | { | |
624 | BlockBackend *blk = NULL; | |
625 | ||
626 | assert(dev != NULL); | |
627 | while ((blk = blk_all_next(blk)) != NULL) { | |
628 | if (blk->dev == dev) { | |
629 | return blk; | |
630 | } | |
631 | } | |
632 | return NULL; | |
633 | } | |
634 | ||
a7f53e26 MA |
635 | /* |
636 | * Set @blk's device model callbacks to @ops. | |
637 | * @opaque is the opaque argument to pass to the callbacks. | |
638 | * This is for use by device models. | |
639 | */ | |
640 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
641 | void *opaque) | |
642 | { | |
bbc8ea98 KW |
643 | /* All drivers that use blk_set_dev_ops() are qdevified and we want to keep |
644 | * it that way, so we can assume blk->dev is a DeviceState if blk->dev_ops | |
645 | * is set. */ | |
646 | assert(!blk->legacy_dev); | |
647 | ||
a7f53e26 MA |
648 | blk->dev_ops = ops; |
649 | blk->dev_opaque = opaque; | |
650 | } | |
651 | ||
652 | /* | |
653 | * Notify @blk's attached device model of media change. | |
654 | * If @load is true, notify of media load. | |
655 | * Else, notify of media eject. | |
656 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
657 | */ | |
658 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
659 | { | |
660 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 661 | bool tray_was_open, tray_is_open; |
a7f53e26 | 662 | |
2d76e724 KW |
663 | assert(!blk->legacy_dev); |
664 | ||
f1f57066 | 665 | tray_was_open = blk_dev_is_tray_open(blk); |
a7f53e26 | 666 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); |
f1f57066 HR |
667 | tray_is_open = blk_dev_is_tray_open(blk); |
668 | ||
669 | if (tray_was_open != tray_is_open) { | |
2d76e724 KW |
670 | char *id = blk_get_attached_dev_id(blk); |
671 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open, | |
f1f57066 | 672 | &error_abort); |
2d76e724 | 673 | g_free(id); |
a7f53e26 MA |
674 | } |
675 | } | |
676 | } | |
677 | ||
5c8cab48 KW |
678 | static void blk_root_change_media(BdrvChild *child, bool load) |
679 | { | |
680 | blk_dev_change_media_cb(child->opaque, load); | |
681 | } | |
682 | ||
a7f53e26 MA |
683 | /* |
684 | * Does @blk's attached device model have removable media? | |
685 | * %true if no device model is attached. | |
686 | */ | |
687 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
688 | { | |
689 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
690 | } | |
691 | ||
8f3a73bc HR |
692 | /* |
693 | * Does @blk's attached device model have a tray? | |
694 | */ | |
695 | bool blk_dev_has_tray(BlockBackend *blk) | |
696 | { | |
697 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
698 | } | |
699 | ||
a7f53e26 MA |
700 | /* |
701 | * Notify @blk's attached device model of a media eject request. | |
702 | * If @force is true, the medium is about to be yanked out forcefully. | |
703 | */ | |
704 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 705 | { |
a7f53e26 MA |
706 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
707 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
708 | } | |
4be74634 MA |
709 | } |
710 | ||
a7f53e26 MA |
711 | /* |
712 | * Does @blk's attached device model have a tray, and is it open? | |
713 | */ | |
714 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 715 | { |
8f3a73bc | 716 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
717 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
718 | } | |
719 | return false; | |
720 | } | |
721 | ||
722 | /* | |
723 | * Does @blk's attached device model have the medium locked? | |
724 | * %false if the device model has no such lock. | |
725 | */ | |
726 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
727 | { | |
728 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
729 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
730 | } | |
731 | return false; | |
732 | } | |
733 | ||
734 | /* | |
735 | * Notify @blk's attached device model of a backend size change. | |
736 | */ | |
5c8cab48 | 737 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 738 | { |
5c8cab48 KW |
739 | BlockBackend *blk = child->opaque; |
740 | ||
a7f53e26 MA |
741 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
742 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
743 | } | |
744 | } | |
745 | ||
746 | void blk_iostatus_enable(BlockBackend *blk) | |
747 | { | |
373340b2 HR |
748 | blk->iostatus_enabled = true; |
749 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
750 | } | |
751 | ||
752 | /* The I/O status is only enabled if the drive explicitly | |
753 | * enables it _and_ the VM is configured to stop on errors */ | |
754 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
755 | { | |
756 | return (blk->iostatus_enabled && | |
757 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
758 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
759 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
760 | } | |
761 | ||
762 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
763 | { | |
764 | return blk->iostatus; | |
765 | } | |
766 | ||
767 | void blk_iostatus_disable(BlockBackend *blk) | |
768 | { | |
769 | blk->iostatus_enabled = false; | |
770 | } | |
771 | ||
772 | void blk_iostatus_reset(BlockBackend *blk) | |
773 | { | |
774 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 775 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 776 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
777 | if (bs && bs->job) { |
778 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
779 | } |
780 | } | |
781 | } | |
782 | ||
783 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
784 | { | |
785 | assert(blk_iostatus_is_enabled(blk)); | |
786 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
787 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
788 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
789 | } | |
4be74634 MA |
790 | } |
791 | ||
c10c9d96 KW |
792 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
793 | { | |
794 | blk->allow_write_beyond_eof = allow; | |
795 | } | |
796 | ||
e7f7d676 HR |
797 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
798 | size_t size) | |
799 | { | |
800 | int64_t len; | |
801 | ||
802 | if (size > INT_MAX) { | |
803 | return -EIO; | |
804 | } | |
805 | ||
c09ba36c | 806 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
807 | return -ENOMEDIUM; |
808 | } | |
809 | ||
e7f7d676 HR |
810 | if (offset < 0) { |
811 | return -EIO; | |
812 | } | |
813 | ||
c10c9d96 KW |
814 | if (!blk->allow_write_beyond_eof) { |
815 | len = blk_getlength(blk); | |
816 | if (len < 0) { | |
817 | return len; | |
818 | } | |
819 | ||
820 | if (offset > len || len - offset < size) { | |
821 | return -EIO; | |
822 | } | |
e7f7d676 HR |
823 | } |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
1e98fefd KW |
828 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
829 | unsigned int bytes, QEMUIOVector *qiov, | |
830 | BdrvRequestFlags flags) | |
4be74634 | 831 | { |
1e98fefd | 832 | int ret; |
99723548 | 833 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 834 | |
99723548 | 835 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
836 | |
837 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
838 | if (ret < 0) { |
839 | return ret; | |
840 | } | |
841 | ||
99723548 PB |
842 | bdrv_inc_in_flight(bs); |
843 | ||
441565b2 KW |
844 | /* throttling disk I/O */ |
845 | if (blk->public.throttle_state) { | |
846 | throttle_group_co_io_limits_intercept(blk, bytes, false); | |
847 | } | |
848 | ||
99723548 PB |
849 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
850 | bdrv_dec_in_flight(bs); | |
851 | return ret; | |
1bf1cbc9 KW |
852 | } |
853 | ||
1e98fefd KW |
854 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
855 | unsigned int bytes, QEMUIOVector *qiov, | |
856 | BdrvRequestFlags flags) | |
a8823a3b | 857 | { |
bfd18d1e | 858 | int ret; |
99723548 | 859 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 860 | |
99723548 | 861 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 862 | |
bfd18d1e | 863 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
864 | if (ret < 0) { |
865 | return ret; | |
866 | } | |
867 | ||
99723548 PB |
868 | bdrv_inc_in_flight(bs); |
869 | ||
441565b2 KW |
870 | /* throttling disk I/O */ |
871 | if (blk->public.throttle_state) { | |
872 | throttle_group_co_io_limits_intercept(blk, bytes, true); | |
873 | } | |
874 | ||
bfd18d1e KW |
875 | if (!blk->enable_write_cache) { |
876 | flags |= BDRV_REQ_FUA; | |
877 | } | |
878 | ||
99723548 PB |
879 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
880 | bdrv_dec_in_flight(bs); | |
881 | return ret; | |
a8823a3b KW |
882 | } |
883 | ||
1bf1cbc9 KW |
884 | typedef struct BlkRwCo { |
885 | BlockBackend *blk; | |
886 | int64_t offset; | |
887 | QEMUIOVector *qiov; | |
888 | int ret; | |
889 | BdrvRequestFlags flags; | |
890 | } BlkRwCo; | |
891 | ||
892 | static void blk_read_entry(void *opaque) | |
893 | { | |
894 | BlkRwCo *rwco = opaque; | |
895 | ||
896 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
897 | rwco->qiov, rwco->flags); | |
898 | } | |
899 | ||
a8823a3b KW |
900 | static void blk_write_entry(void *opaque) |
901 | { | |
902 | BlkRwCo *rwco = opaque; | |
903 | ||
904 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
905 | rwco->qiov, rwco->flags); | |
906 | } | |
907 | ||
a55d3fba KW |
908 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
909 | int64_t bytes, CoroutineEntry co_entry, | |
910 | BdrvRequestFlags flags) | |
1bf1cbc9 | 911 | { |
1bf1cbc9 KW |
912 | QEMUIOVector qiov; |
913 | struct iovec iov; | |
1bf1cbc9 KW |
914 | BlkRwCo rwco; |
915 | ||
1bf1cbc9 KW |
916 | iov = (struct iovec) { |
917 | .iov_base = buf, | |
a55d3fba | 918 | .iov_len = bytes, |
1bf1cbc9 KW |
919 | }; |
920 | qemu_iovec_init_external(&qiov, &iov, 1); | |
921 | ||
922 | rwco = (BlkRwCo) { | |
923 | .blk = blk, | |
a55d3fba | 924 | .offset = offset, |
1bf1cbc9 | 925 | .qiov = &qiov, |
fc1453cd | 926 | .flags = flags, |
1bf1cbc9 KW |
927 | .ret = NOT_DONE, |
928 | }; | |
929 | ||
35f106e6 PB |
930 | if (qemu_in_coroutine()) { |
931 | /* Fast-path if already in coroutine context */ | |
932 | co_entry(&rwco); | |
933 | } else { | |
934 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
935 | qemu_coroutine_enter(co); | |
936 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); | |
937 | } | |
1bf1cbc9 KW |
938 | |
939 | return rwco.ret; | |
4be74634 MA |
940 | } |
941 | ||
b7d17f9f EB |
942 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
943 | int count) | |
4be74634 | 944 | { |
5bd51196 KW |
945 | int ret; |
946 | ||
b7d17f9f | 947 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
948 | if (ret < 0) { |
949 | return ret; | |
950 | } | |
951 | ||
c2066af0 | 952 | blk_root_drained_begin(blk->root); |
b7d17f9f | 953 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 954 | blk_root_drained_end(blk->root); |
5bd51196 | 955 | return ret; |
4be74634 MA |
956 | } |
957 | ||
d004bd52 EB |
958 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
959 | int count, BdrvRequestFlags flags) | |
0df89e8e | 960 | { |
983a1600 EB |
961 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
962 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
963 | } |
964 | ||
720ff280 KW |
965 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
966 | { | |
967 | return bdrv_make_zero(blk->root, flags); | |
968 | } | |
969 | ||
e7f7d676 HR |
970 | static void error_callback_bh(void *opaque) |
971 | { | |
972 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 PB |
973 | |
974 | bdrv_dec_in_flight(acb->common.bs); | |
e7f7d676 HR |
975 | acb->common.cb(acb->common.opaque, acb->ret); |
976 | qemu_aio_unref(acb); | |
977 | } | |
978 | ||
ca78ecfa PL |
979 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
980 | BlockCompletionFunc *cb, | |
981 | void *opaque, int ret) | |
e7f7d676 HR |
982 | { |
983 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 984 | |
99723548 | 985 | bdrv_inc_in_flight(blk_bs(blk)); |
e7f7d676 | 986 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 987 | acb->blk = blk; |
e7f7d676 HR |
988 | acb->ret = ret; |
989 | ||
fffb6e12 | 990 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
991 | return &acb->common; |
992 | } | |
993 | ||
57d6a428 KW |
994 | typedef struct BlkAioEmAIOCB { |
995 | BlockAIOCB common; | |
996 | BlkRwCo rwco; | |
7fa84cd8 | 997 | int bytes; |
57d6a428 | 998 | bool has_returned; |
57d6a428 KW |
999 | } BlkAioEmAIOCB; |
1000 | ||
1001 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1002 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1003 | }; | |
1004 | ||
1005 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1006 | { | |
57d6a428 | 1007 | if (acb->has_returned) { |
99723548 | 1008 | bdrv_dec_in_flight(acb->common.bs); |
57d6a428 KW |
1009 | acb->common.cb(acb->common.opaque, acb->rwco.ret); |
1010 | qemu_aio_unref(acb); | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | static void blk_aio_complete_bh(void *opaque) | |
1015 | { | |
fffb6e12 | 1016 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1017 | assert(acb->has_returned); |
1018 | blk_aio_complete(acb); | |
57d6a428 KW |
1019 | } |
1020 | ||
7fa84cd8 | 1021 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
1022 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
1023 | BdrvRequestFlags flags, | |
1024 | BlockCompletionFunc *cb, void *opaque) | |
1025 | { | |
1026 | BlkAioEmAIOCB *acb; | |
1027 | Coroutine *co; | |
1028 | ||
99723548 | 1029 | bdrv_inc_in_flight(blk_bs(blk)); |
57d6a428 KW |
1030 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1031 | acb->rwco = (BlkRwCo) { | |
1032 | .blk = blk, | |
1033 | .offset = offset, | |
1034 | .qiov = qiov, | |
1035 | .flags = flags, | |
1036 | .ret = NOT_DONE, | |
1037 | }; | |
7fa84cd8 | 1038 | acb->bytes = bytes; |
57d6a428 KW |
1039 | acb->has_returned = false; |
1040 | ||
0b8b8753 PB |
1041 | co = qemu_coroutine_create(co_entry, acb); |
1042 | qemu_coroutine_enter(co); | |
57d6a428 KW |
1043 | |
1044 | acb->has_returned = true; | |
1045 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1046 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1047 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1048 | } |
1049 | ||
1050 | return &acb->common; | |
1051 | } | |
1052 | ||
1053 | static void blk_aio_read_entry(void *opaque) | |
1054 | { | |
1055 | BlkAioEmAIOCB *acb = opaque; | |
1056 | BlkRwCo *rwco = &acb->rwco; | |
1057 | ||
7fa84cd8 KW |
1058 | assert(rwco->qiov->size == acb->bytes); |
1059 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1060 | rwco->qiov, rwco->flags); |
1061 | blk_aio_complete(acb); | |
1062 | } | |
1063 | ||
1064 | static void blk_aio_write_entry(void *opaque) | |
1065 | { | |
1066 | BlkAioEmAIOCB *acb = opaque; | |
1067 | BlkRwCo *rwco = &acb->rwco; | |
1068 | ||
7fa84cd8 KW |
1069 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
1070 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1071 | rwco->qiov, rwco->flags); |
1072 | blk_aio_complete(acb); | |
1073 | } | |
1074 | ||
d004bd52 EB |
1075 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1076 | int count, BdrvRequestFlags flags, | |
1077 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1078 | { |
983a1600 EB |
1079 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1080 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1081 | } |
1082 | ||
1083 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1084 | { | |
a55d3fba | 1085 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1086 | if (ret < 0) { |
1087 | return ret; | |
1088 | } | |
a55d3fba | 1089 | return count; |
4be74634 MA |
1090 | } |
1091 | ||
8341f00d EB |
1092 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1093 | BdrvRequestFlags flags) | |
4be74634 | 1094 | { |
8341f00d EB |
1095 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1096 | flags); | |
e7f7d676 HR |
1097 | if (ret < 0) { |
1098 | return ret; | |
1099 | } | |
a55d3fba | 1100 | return count; |
4be74634 MA |
1101 | } |
1102 | ||
1103 | int64_t blk_getlength(BlockBackend *blk) | |
1104 | { | |
c09ba36c HR |
1105 | if (!blk_is_available(blk)) { |
1106 | return -ENOMEDIUM; | |
1107 | } | |
1108 | ||
f21d96d0 | 1109 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1110 | } |
1111 | ||
1112 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1113 | { | |
f21d96d0 | 1114 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1115 | *nb_sectors_ptr = 0; |
1116 | } else { | |
f21d96d0 | 1117 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1118 | } |
4be74634 MA |
1119 | } |
1120 | ||
1ef01253 HR |
1121 | int64_t blk_nb_sectors(BlockBackend *blk) |
1122 | { | |
c09ba36c HR |
1123 | if (!blk_is_available(blk)) { |
1124 | return -ENOMEDIUM; | |
1125 | } | |
1126 | ||
f21d96d0 | 1127 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1128 | } |
1129 | ||
60cb2fa7 EB |
1130 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1131 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1132 | BlockCompletionFunc *cb, void *opaque) | |
1133 | { | |
1134 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1135 | blk_aio_read_entry, flags, cb, opaque); | |
1136 | } | |
1137 | ||
60cb2fa7 EB |
1138 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1139 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1140 | BlockCompletionFunc *cb, void *opaque) | |
1141 | { | |
1142 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1143 | blk_aio_write_entry, flags, cb, opaque); | |
1144 | } | |
1145 | ||
be07a889 KW |
1146 | static void blk_aio_flush_entry(void *opaque) |
1147 | { | |
1148 | BlkAioEmAIOCB *acb = opaque; | |
1149 | BlkRwCo *rwco = &acb->rwco; | |
1150 | ||
1151 | rwco->ret = blk_co_flush(rwco->blk); | |
1152 | blk_aio_complete(acb); | |
1153 | } | |
1154 | ||
4be74634 MA |
1155 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1156 | BlockCompletionFunc *cb, void *opaque) | |
1157 | { | |
be07a889 | 1158 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1159 | } |
1160 | ||
8c2e3dd5 KW |
1161 | static void blk_aio_pdiscard_entry(void *opaque) |
1162 | { | |
1163 | BlkAioEmAIOCB *acb = opaque; | |
1164 | BlkRwCo *rwco = &acb->rwco; | |
1165 | ||
1166 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1167 | blk_aio_complete(acb); | |
1168 | } | |
1169 | ||
1c6c4bb7 EB |
1170 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
1171 | int64_t offset, int count, | |
1172 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1173 | { |
8c2e3dd5 KW |
1174 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_pdiscard_entry, 0, |
1175 | cb, opaque); | |
4be74634 MA |
1176 | } |
1177 | ||
1178 | void blk_aio_cancel(BlockAIOCB *acb) | |
1179 | { | |
1180 | bdrv_aio_cancel(acb); | |
1181 | } | |
1182 | ||
1183 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1184 | { | |
1185 | bdrv_aio_cancel_async(acb); | |
1186 | } | |
1187 | ||
48af776a | 1188 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1189 | { |
c09ba36c HR |
1190 | if (!blk_is_available(blk)) { |
1191 | return -ENOMEDIUM; | |
1192 | } | |
1193 | ||
48af776a KW |
1194 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1195 | } | |
1196 | ||
1197 | static void blk_ioctl_entry(void *opaque) | |
1198 | { | |
1199 | BlkRwCo *rwco = opaque; | |
1200 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1201 | rwco->qiov->iov[0].iov_base); | |
1202 | } | |
1203 | ||
1204 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1205 | { | |
1206 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1207 | } | |
1208 | ||
1209 | static void blk_aio_ioctl_entry(void *opaque) | |
1210 | { | |
1211 | BlkAioEmAIOCB *acb = opaque; | |
1212 | BlkRwCo *rwco = &acb->rwco; | |
1213 | ||
1214 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1215 | rwco->qiov->iov[0].iov_base); | |
1216 | blk_aio_complete(acb); | |
4be74634 MA |
1217 | } |
1218 | ||
1219 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1220 | BlockCompletionFunc *cb, void *opaque) | |
1221 | { | |
48af776a KW |
1222 | QEMUIOVector qiov; |
1223 | struct iovec iov; | |
1224 | ||
1225 | iov = (struct iovec) { | |
1226 | .iov_base = buf, | |
1227 | .iov_len = 0, | |
1228 | }; | |
1229 | qemu_iovec_init_external(&qiov, &iov, 1); | |
c09ba36c | 1230 | |
48af776a | 1231 | return blk_aio_prwv(blk, req, 0, &qiov, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1232 | } |
1233 | ||
1c6c4bb7 | 1234 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count) |
2bb0dce7 | 1235 | { |
1c6c4bb7 | 1236 | int ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1237 | if (ret < 0) { |
1238 | return ret; | |
1239 | } | |
1240 | ||
1c6c4bb7 | 1241 | return bdrv_co_pdiscard(blk_bs(blk), offset, count); |
2bb0dce7 HR |
1242 | } |
1243 | ||
1244 | int blk_co_flush(BlockBackend *blk) | |
1245 | { | |
c09ba36c HR |
1246 | if (!blk_is_available(blk)) { |
1247 | return -ENOMEDIUM; | |
1248 | } | |
1249 | ||
f21d96d0 | 1250 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1251 | } |
1252 | ||
be07a889 | 1253 | static void blk_flush_entry(void *opaque) |
4be74634 | 1254 | { |
be07a889 KW |
1255 | BlkRwCo *rwco = opaque; |
1256 | rwco->ret = blk_co_flush(rwco->blk); | |
1257 | } | |
c09ba36c | 1258 | |
be07a889 KW |
1259 | int blk_flush(BlockBackend *blk) |
1260 | { | |
1261 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1262 | } |
1263 | ||
97b0385a AY |
1264 | void blk_drain(BlockBackend *blk) |
1265 | { | |
f21d96d0 KW |
1266 | if (blk_bs(blk)) { |
1267 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1268 | } |
97b0385a AY |
1269 | } |
1270 | ||
4be74634 MA |
1271 | void blk_drain_all(void) |
1272 | { | |
1273 | bdrv_drain_all(); | |
1274 | } | |
1275 | ||
373340b2 HR |
1276 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1277 | BlockdevOnError on_write_error) | |
1278 | { | |
1279 | blk->on_read_error = on_read_error; | |
1280 | blk->on_write_error = on_write_error; | |
1281 | } | |
1282 | ||
4be74634 MA |
1283 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1284 | { | |
373340b2 | 1285 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1286 | } |
1287 | ||
1288 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1289 | int error) | |
1290 | { | |
373340b2 HR |
1291 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1292 | ||
1293 | switch (on_err) { | |
1294 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1295 | return (error == ENOSPC) ? | |
1296 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1297 | case BLOCKDEV_ON_ERROR_STOP: | |
1298 | return BLOCK_ERROR_ACTION_STOP; | |
1299 | case BLOCKDEV_ON_ERROR_REPORT: | |
1300 | return BLOCK_ERROR_ACTION_REPORT; | |
1301 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1302 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1303 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1304 | default: |
1305 | abort(); | |
1306 | } | |
4be74634 MA |
1307 | } |
1308 | ||
373340b2 HR |
1309 | static void send_qmp_error_event(BlockBackend *blk, |
1310 | BlockErrorAction action, | |
1311 | bool is_read, int error) | |
1312 | { | |
1313 | IoOperationType optype; | |
1314 | ||
1315 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
2bf7e10f KW |
1316 | qapi_event_send_block_io_error(blk_name(blk), |
1317 | bdrv_get_node_name(blk_bs(blk)), optype, | |
1318 | action, blk_iostatus_is_enabled(blk), | |
373340b2 HR |
1319 | error == ENOSPC, strerror(error), |
1320 | &error_abort); | |
1321 | } | |
1322 | ||
1323 | /* This is done by device models because, while the block layer knows | |
1324 | * about the error, it does not know whether an operation comes from | |
1325 | * the device or the block layer (from a job, for example). | |
1326 | */ | |
4be74634 MA |
1327 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1328 | bool is_read, int error) | |
1329 | { | |
373340b2 HR |
1330 | assert(error >= 0); |
1331 | ||
1332 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1333 | /* First set the iostatus, so that "info block" returns an iostatus | |
1334 | * that matches the events raised so far (an additional error iostatus | |
1335 | * is fine, but not a lost one). | |
1336 | */ | |
1337 | blk_iostatus_set_err(blk, error); | |
1338 | ||
1339 | /* Then raise the request to stop the VM and the event. | |
1340 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1341 | * it ensures that the STOP event always comes after the | |
1342 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1343 | * can observe the STOP event and do a "cont" before the STOP | |
1344 | * event is issued, the VM will not stop. In this case, vm_start() | |
1345 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1346 | */ | |
1347 | qemu_system_vmstop_request_prepare(); | |
1348 | send_qmp_error_event(blk, action, is_read, error); | |
1349 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1350 | } else { | |
1351 | send_qmp_error_event(blk, action, is_read, error); | |
1352 | } | |
4be74634 MA |
1353 | } |
1354 | ||
1355 | int blk_is_read_only(BlockBackend *blk) | |
1356 | { | |
f21d96d0 KW |
1357 | BlockDriverState *bs = blk_bs(blk); |
1358 | ||
1359 | if (bs) { | |
1360 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1361 | } else { |
1362 | return blk->root_state.read_only; | |
1363 | } | |
4be74634 MA |
1364 | } |
1365 | ||
1366 | int blk_is_sg(BlockBackend *blk) | |
1367 | { | |
f21d96d0 KW |
1368 | BlockDriverState *bs = blk_bs(blk); |
1369 | ||
1370 | if (!bs) { | |
a46fc9c9 HR |
1371 | return 0; |
1372 | } | |
1373 | ||
f21d96d0 | 1374 | return bdrv_is_sg(bs); |
4be74634 MA |
1375 | } |
1376 | ||
1377 | int blk_enable_write_cache(BlockBackend *blk) | |
1378 | { | |
bfd18d1e | 1379 | return blk->enable_write_cache; |
4be74634 MA |
1380 | } |
1381 | ||
1382 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1383 | { | |
bfd18d1e | 1384 | blk->enable_write_cache = wce; |
4be74634 MA |
1385 | } |
1386 | ||
2bb0dce7 HR |
1387 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1388 | { | |
f21d96d0 KW |
1389 | BlockDriverState *bs = blk_bs(blk); |
1390 | ||
1391 | if (!bs) { | |
c09ba36c HR |
1392 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1393 | return; | |
1394 | } | |
1395 | ||
f21d96d0 | 1396 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1397 | } |
1398 | ||
e031f750 | 1399 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1400 | { |
f21d96d0 KW |
1401 | BlockDriverState *bs = blk_bs(blk); |
1402 | ||
1403 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1404 | } |
1405 | ||
1406 | bool blk_is_available(BlockBackend *blk) | |
1407 | { | |
1408 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1409 | } |
1410 | ||
1411 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1412 | { | |
f21d96d0 KW |
1413 | BlockDriverState *bs = blk_bs(blk); |
1414 | ||
1415 | if (bs) { | |
1416 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1417 | } |
4be74634 MA |
1418 | } |
1419 | ||
1420 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1421 | { | |
f21d96d0 | 1422 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1423 | char *id; |
1424 | ||
1425 | /* blk_eject is only called by qdevified devices */ | |
1426 | assert(!blk->legacy_dev); | |
f21d96d0 KW |
1427 | |
1428 | if (bs) { | |
1429 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1430 | } |
c47ee043 JS |
1431 | |
1432 | /* Whether or not we ejected on the backend, | |
1433 | * the frontend experienced a tray event. */ | |
1434 | id = blk_get_attached_dev_id(blk); | |
1435 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
1436 | eject_flag, &error_abort); | |
1437 | g_free(id); | |
4be74634 MA |
1438 | } |
1439 | ||
1440 | int blk_get_flags(BlockBackend *blk) | |
1441 | { | |
f21d96d0 KW |
1442 | BlockDriverState *bs = blk_bs(blk); |
1443 | ||
1444 | if (bs) { | |
1445 | return bdrv_get_flags(bs); | |
061959e8 HR |
1446 | } else { |
1447 | return blk->root_state.open_flags; | |
1448 | } | |
4be74634 MA |
1449 | } |
1450 | ||
5def6b80 EB |
1451 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1452 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1453 | { |
f21d96d0 | 1454 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1455 | uint32_t max = 0; |
f21d96d0 KW |
1456 | |
1457 | if (bs) { | |
5def6b80 | 1458 | max = bs->bl.max_transfer; |
a46fc9c9 | 1459 | } |
5def6b80 | 1460 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1461 | } |
1462 | ||
648296e0 SH |
1463 | int blk_get_max_iov(BlockBackend *blk) |
1464 | { | |
f21d96d0 | 1465 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1466 | } |
1467 | ||
4be74634 MA |
1468 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1469 | { | |
68e9ec01 | 1470 | blk->guest_block_size = align; |
4be74634 MA |
1471 | } |
1472 | ||
f1c17521 PB |
1473 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1474 | { | |
f21d96d0 | 1475 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1476 | } |
1477 | ||
4be74634 MA |
1478 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1479 | { | |
f21d96d0 | 1480 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1481 | } |
1482 | ||
1483 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1484 | { | |
f21d96d0 KW |
1485 | BlockDriverState *bs = blk_bs(blk); |
1486 | ||
1487 | if (!bs) { | |
a46fc9c9 HR |
1488 | return false; |
1489 | } | |
1490 | ||
f21d96d0 | 1491 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1492 | } |
1493 | ||
1494 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1495 | { | |
f21d96d0 KW |
1496 | BlockDriverState *bs = blk_bs(blk); |
1497 | ||
1498 | if (bs) { | |
1499 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1500 | } |
4be74634 MA |
1501 | } |
1502 | ||
1503 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1504 | { | |
f21d96d0 KW |
1505 | BlockDriverState *bs = blk_bs(blk); |
1506 | ||
1507 | if (bs) { | |
1508 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1509 | } |
4be74634 MA |
1510 | } |
1511 | ||
1512 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1513 | { | |
f21d96d0 KW |
1514 | BlockDriverState *bs = blk_bs(blk); |
1515 | ||
1516 | if (bs) { | |
1517 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1518 | } |
4be74634 MA |
1519 | } |
1520 | ||
1521 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1522 | { | |
f21d96d0 KW |
1523 | BlockDriverState *bs = blk_bs(blk); |
1524 | ||
1525 | if (bs) { | |
1526 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1527 | } else { |
1528 | return qemu_get_aio_context(); | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1533 | { | |
1534 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1535 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1536 | } |
1537 | ||
1538 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1539 | { | |
f21d96d0 KW |
1540 | BlockDriverState *bs = blk_bs(blk); |
1541 | ||
1542 | if (bs) { | |
7ca7f0f6 KW |
1543 | if (blk->public.throttle_state) { |
1544 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); | |
1545 | } | |
f21d96d0 | 1546 | bdrv_set_aio_context(bs, new_context); |
7ca7f0f6 KW |
1547 | if (blk->public.throttle_state) { |
1548 | throttle_timers_attach_aio_context(&blk->public.throttle_timers, | |
1549 | new_context); | |
1550 | } | |
a46fc9c9 | 1551 | } |
4be74634 MA |
1552 | } |
1553 | ||
2019ba0a HR |
1554 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1555 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1556 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1557 | { | |
f21d96d0 KW |
1558 | BlockDriverState *bs = blk_bs(blk); |
1559 | ||
1560 | if (bs) { | |
1561 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1562 | detach_aio_context, opaque); |
1563 | } | |
2019ba0a HR |
1564 | } |
1565 | ||
1566 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1567 | void (*attached_aio_context)(AioContext *, | |
1568 | void *), | |
1569 | void (*detach_aio_context)(void *), | |
1570 | void *opaque) | |
1571 | { | |
f21d96d0 KW |
1572 | BlockDriverState *bs = blk_bs(blk); |
1573 | ||
1574 | if (bs) { | |
1575 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1576 | detach_aio_context, opaque); |
1577 | } | |
2019ba0a HR |
1578 | } |
1579 | ||
3301f6c6 HR |
1580 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1581 | { | |
1582 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1583 | } | |
1584 | ||
1585 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1586 | { | |
1587 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1588 | } | |
1589 | ||
4be74634 MA |
1590 | void blk_io_plug(BlockBackend *blk) |
1591 | { | |
f21d96d0 KW |
1592 | BlockDriverState *bs = blk_bs(blk); |
1593 | ||
1594 | if (bs) { | |
1595 | bdrv_io_plug(bs); | |
a46fc9c9 | 1596 | } |
4be74634 MA |
1597 | } |
1598 | ||
1599 | void blk_io_unplug(BlockBackend *blk) | |
1600 | { | |
f21d96d0 KW |
1601 | BlockDriverState *bs = blk_bs(blk); |
1602 | ||
1603 | if (bs) { | |
1604 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1605 | } |
4be74634 MA |
1606 | } |
1607 | ||
1608 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1609 | { | |
7f0e9da6 | 1610 | return &blk->stats; |
4be74634 MA |
1611 | } |
1612 | ||
1613 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1614 | BlockCompletionFunc *cb, void *opaque) | |
1615 | { | |
1616 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1617 | } | |
1ef01253 | 1618 | |
d004bd52 EB |
1619 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1620 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1621 | { |
983a1600 | 1622 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1623 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1624 | } |
1625 | ||
fe5c1355 PB |
1626 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1627 | int count) | |
1ef01253 | 1628 | { |
35fadca8 PB |
1629 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1630 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
1631 | } |
1632 | ||
1633 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1634 | { | |
c09ba36c HR |
1635 | if (!blk_is_available(blk)) { |
1636 | return -ENOMEDIUM; | |
1637 | } | |
1638 | ||
52cdbc58 | 1639 | return bdrv_truncate(blk->root, offset); |
1ef01253 HR |
1640 | } |
1641 | ||
8c2e3dd5 | 1642 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 1643 | { |
8c2e3dd5 KW |
1644 | BlkRwCo *rwco = opaque; |
1645 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, rwco->qiov->size); | |
1646 | } | |
e7f7d676 | 1647 | |
8c2e3dd5 KW |
1648 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int count) |
1649 | { | |
1650 | return blk_prw(blk, offset, NULL, count, blk_pdiscard_entry, 0); | |
1ef01253 HR |
1651 | } |
1652 | ||
1653 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1654 | int64_t pos, int size) | |
1655 | { | |
bfd18d1e KW |
1656 | int ret; |
1657 | ||
c09ba36c HR |
1658 | if (!blk_is_available(blk)) { |
1659 | return -ENOMEDIUM; | |
1660 | } | |
1661 | ||
bfd18d1e KW |
1662 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1663 | if (ret < 0) { | |
1664 | return ret; | |
1665 | } | |
1666 | ||
1667 | if (ret == size && !blk->enable_write_cache) { | |
1668 | ret = bdrv_flush(blk_bs(blk)); | |
1669 | } | |
1670 | ||
1671 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1672 | } |
1673 | ||
1674 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1675 | { | |
c09ba36c HR |
1676 | if (!blk_is_available(blk)) { |
1677 | return -ENOMEDIUM; | |
1678 | } | |
1679 | ||
f21d96d0 | 1680 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1681 | } |
f0272c4d ET |
1682 | |
1683 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1684 | { | |
c09ba36c HR |
1685 | if (!blk_is_available(blk)) { |
1686 | return -ENOMEDIUM; | |
1687 | } | |
1688 | ||
f21d96d0 | 1689 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1690 | } |
1691 | ||
1692 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1693 | { | |
c09ba36c HR |
1694 | if (!blk_is_available(blk)) { |
1695 | return -ENOMEDIUM; | |
1696 | } | |
1697 | ||
f21d96d0 | 1698 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1699 | } |
281d22d8 HR |
1700 | |
1701 | /* | |
1702 | * Updates the BlockBackendRootState object with data from the currently | |
1703 | * attached BlockDriverState. | |
1704 | */ | |
1705 | void blk_update_root_state(BlockBackend *blk) | |
1706 | { | |
f21d96d0 | 1707 | assert(blk->root); |
281d22d8 | 1708 | |
f21d96d0 KW |
1709 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1710 | blk->root_state.read_only = blk->root->bs->read_only; | |
1711 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1712 | } |
1713 | ||
38cb18f5 | 1714 | /* |
b85114f8 KW |
1715 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
1716 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 1717 | */ |
b85114f8 | 1718 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 1719 | { |
b85114f8 | 1720 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
1721 | } |
1722 | ||
1723 | /* | |
1724 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1725 | * supposed to inherit the root state. | |
1726 | */ | |
1727 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1728 | { | |
1729 | int bs_flags; | |
1730 | ||
1731 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1732 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1733 | ||
1734 | return bs_flags; | |
1735 | } | |
1736 | ||
281d22d8 HR |
1737 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1738 | { | |
1739 | return &blk->root_state; | |
1740 | } | |
1393f212 HR |
1741 | |
1742 | int blk_commit_all(void) | |
1743 | { | |
fe1a9cbc HR |
1744 | BlockBackend *blk = NULL; |
1745 | ||
1746 | while ((blk = blk_all_next(blk)) != NULL) { | |
1747 | AioContext *aio_context = blk_get_aio_context(blk); | |
1748 | ||
1749 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1750 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1751 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1752 | if (ret < 0) { |
1753 | aio_context_release(aio_context); | |
1754 | return ret; | |
1755 | } | |
1756 | } | |
1757 | aio_context_release(aio_context); | |
1758 | } | |
1759 | return 0; | |
1760 | } | |
1761 | ||
97148076 KW |
1762 | |
1763 | /* throttling disk I/O limits */ | |
1764 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
1765 | { | |
1766 | throttle_group_config(blk, cfg); | |
1767 | } | |
1768 | ||
1769 | void blk_io_limits_disable(BlockBackend *blk) | |
1770 | { | |
1771 | assert(blk->public.throttle_state); | |
c2066af0 | 1772 | bdrv_drained_begin(blk_bs(blk)); |
97148076 | 1773 | throttle_group_unregister_blk(blk); |
c2066af0 | 1774 | bdrv_drained_end(blk_bs(blk)); |
97148076 KW |
1775 | } |
1776 | ||
1777 | /* should be called before blk_set_io_limits if a limit is set */ | |
1778 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
1779 | { | |
1780 | assert(!blk->public.throttle_state); | |
1781 | throttle_group_register_blk(blk, group); | |
1782 | } | |
1783 | ||
1784 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
1785 | { | |
1786 | /* this BB is not part of any group */ | |
1787 | if (!blk->public.throttle_state) { | |
1788 | return; | |
1789 | } | |
1790 | ||
1791 | /* this BB is a part of the same group than the one we want */ | |
1792 | if (!g_strcmp0(throttle_group_get_name(blk), group)) { | |
1793 | return; | |
1794 | } | |
1795 | ||
1796 | /* need to change the group this bs belong to */ | |
1797 | blk_io_limits_disable(blk); | |
1798 | blk_io_limits_enable(blk, group); | |
1799 | } | |
c2066af0 KW |
1800 | |
1801 | static void blk_root_drained_begin(BdrvChild *child) | |
1802 | { | |
1803 | BlockBackend *blk = child->opaque; | |
1804 | ||
36fe1331 KW |
1805 | /* Note that blk->root may not be accessible here yet if we are just |
1806 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
1807 | ||
c2066af0 KW |
1808 | if (blk->public.io_limits_disabled++ == 0) { |
1809 | throttle_group_restart_blk(blk); | |
1810 | } | |
1811 | } | |
1812 | ||
1813 | static void blk_root_drained_end(BdrvChild *child) | |
1814 | { | |
1815 | BlockBackend *blk = child->opaque; | |
1816 | ||
1817 | assert(blk->public.io_limits_disabled); | |
1818 | --blk->public.io_limits_disabled; | |
1819 | } |