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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" |
16d36e29 | 17 | #include "block/coroutines.h" |
281d22d8 | 18 | #include "block/throttle-groups.h" |
13d4ff07 | 19 | #include "hw/qdev-core.h" |
18e46a03 | 20 | #include "sysemu/blockdev.h" |
54d31236 | 21 | #include "sysemu/runstate.h" |
e4ec5ad4 | 22 | #include "sysemu/replay.h" |
e688df6b | 23 | #include "qapi/error.h" |
9af23989 | 24 | #include "qapi/qapi-events-block.h" |
f348b6d1 | 25 | #include "qemu/id.h" |
db725815 | 26 | #include "qemu/main-loop.h" |
922a01a0 | 27 | #include "qemu/option.h" |
1e98fefd | 28 | #include "trace.h" |
5f7772c4 | 29 | #include "migration/misc.h" |
a7f53e26 MA |
30 | |
31 | /* Number of coroutines to reserve per attached device model */ | |
32 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 33 | |
1bf1cbc9 KW |
34 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
35 | ||
4981bdec HR |
36 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
37 | ||
d03654ea SH |
38 | typedef struct BlockBackendAioNotifier { |
39 | void (*attached_aio_context)(AioContext *new_context, void *opaque); | |
40 | void (*detach_aio_context)(void *opaque); | |
41 | void *opaque; | |
42 | QLIST_ENTRY(BlockBackendAioNotifier) list; | |
43 | } BlockBackendAioNotifier; | |
44 | ||
26f54e9a MA |
45 | struct BlockBackend { |
46 | char *name; | |
47 | int refcnt; | |
f21d96d0 | 48 | BdrvChild *root; |
d861ab3a | 49 | AioContext *ctx; |
26f8b3a8 | 50 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 51 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 52 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 53 | BlockBackendPublic public; |
a7f53e26 | 54 | |
d09ea2d2 | 55 | DeviceState *dev; /* attached device model, if any */ |
a7f53e26 MA |
56 | const BlockDevOps *dev_ops; |
57 | void *dev_opaque; | |
68e9ec01 | 58 | |
281d22d8 HR |
59 | /* If the BDS tree is removed, some of its options are stored here (which |
60 | * can be used to restore those options in the new BDS on insert) */ | |
61 | BlockBackendRootState root_state; | |
62 | ||
bfd18d1e KW |
63 | bool enable_write_cache; |
64 | ||
7f0e9da6 HR |
65 | /* I/O stats (display with "info blockstats"). */ |
66 | BlockAcctStats stats; | |
373340b2 HR |
67 | |
68 | BlockdevOnError on_read_error, on_write_error; | |
69 | bool iostatus_enabled; | |
70 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 71 | |
981776b3 KW |
72 | uint64_t perm; |
73 | uint64_t shared_perm; | |
d35ff5e6 | 74 | bool disable_perm; |
981776b3 | 75 | |
980b0f94 | 76 | bool allow_aio_context_change; |
c10c9d96 KW |
77 | bool allow_write_beyond_eof; |
78 | ||
a2c4c3b1 | 79 | /* Protected by BQL */ |
3301f6c6 | 80 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
d03654ea | 81 | QLIST_HEAD(, BlockBackendAioNotifier) aio_notifiers; |
f4d9cc88 | 82 | |
c4d5bf99 | 83 | int quiesce_counter; /* atomic: written under BQL, read by other threads */ |
407ae2ae | 84 | QemuMutex queued_requests_lock; /* protects queued_requests */ |
cf312932 | 85 | CoQueue queued_requests; |
ef80ec50 | 86 | bool disable_request_queuing; /* atomic */ |
cf312932 | 87 | |
5f7772c4 | 88 | VMChangeStateEntry *vmsh; |
ca2e2144 | 89 | bool force_allow_inactivate; |
33f2a757 SH |
90 | |
91 | /* Number of in-flight aio requests. BlockDriverState also counts | |
92 | * in-flight requests but aio requests can exist even when blk->root is | |
93 | * NULL, so we cannot rely on its counter for that case. | |
94 | * Accessed with atomic ops. | |
95 | */ | |
96 | unsigned int in_flight; | |
26f54e9a MA |
97 | }; |
98 | ||
e7f7d676 HR |
99 | typedef struct BlockBackendAIOCB { |
100 | BlockAIOCB common; | |
4981bdec | 101 | BlockBackend *blk; |
e7f7d676 HR |
102 | int ret; |
103 | } BlockBackendAIOCB; | |
104 | ||
105 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 106 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
107 | .aiocb_size = sizeof(BlockBackendAIOCB), |
108 | }; | |
109 | ||
8fb3c76c | 110 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 111 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
8fb3c76c | 112 | |
a2c4c3b1 | 113 | /* All BlockBackends. Protected by BQL. */ |
2cf22d6a HR |
114 | static QTAILQ_HEAD(, BlockBackend) block_backends = |
115 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
116 | ||
a2c4c3b1 EGE |
117 | /* |
118 | * All BlockBackends referenced by the monitor and which are iterated through by | |
119 | * blk_next(). Protected by BQL. | |
120 | */ | |
9492b0b9 HR |
121 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = |
122 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 123 | |
3cdc69d3 | 124 | static void blk_root_inherit_options(BdrvChildRole role, bool parent_is_format, |
272c02ea | 125 | int *child_flags, QDict *child_options, |
f21d96d0 KW |
126 | int parent_flags, QDict *parent_options) |
127 | { | |
128 | /* We're not supposed to call this function for root nodes */ | |
129 | abort(); | |
130 | } | |
c2066af0 | 131 | static void blk_root_drained_begin(BdrvChild *child); |
fe5258a5 | 132 | static bool blk_root_drained_poll(BdrvChild *child); |
2f65df6e | 133 | static void blk_root_drained_end(BdrvChild *child); |
f21d96d0 | 134 | |
5c8cab48 KW |
135 | static void blk_root_change_media(BdrvChild *child, bool load); |
136 | static void blk_root_resize(BdrvChild *child); | |
137 | ||
33949396 EGE |
138 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
139 | GHashTable *visited, Transaction *tran, | |
140 | Error **errp); | |
38475269 | 141 | |
b5411555 KW |
142 | static char *blk_root_get_parent_desc(BdrvChild *child) |
143 | { | |
144 | BlockBackend *blk = child->opaque; | |
fd240a18 | 145 | g_autofree char *dev_id = NULL; |
b5411555 KW |
146 | |
147 | if (blk->name) { | |
fd240a18 | 148 | return g_strdup_printf("block device '%s'", blk->name); |
b5411555 KW |
149 | } |
150 | ||
151 | dev_id = blk_get_attached_dev_id(blk); | |
152 | if (*dev_id) { | |
fd240a18 | 153 | return g_strdup_printf("block device '%s'", dev_id); |
b5411555 KW |
154 | } else { |
155 | /* TODO Callback into the BB owner for something more detailed */ | |
fd240a18 | 156 | return g_strdup("an unnamed block device"); |
b5411555 KW |
157 | } |
158 | } | |
159 | ||
4c265bf9 KW |
160 | static const char *blk_root_get_name(BdrvChild *child) |
161 | { | |
162 | return blk_name(child->opaque); | |
163 | } | |
164 | ||
538f0497 | 165 | static void blk_vm_state_changed(void *opaque, bool running, RunState state) |
5f7772c4 FZ |
166 | { |
167 | Error *local_err = NULL; | |
168 | BlockBackend *blk = opaque; | |
169 | ||
170 | if (state == RUN_STATE_INMIGRATE) { | |
171 | return; | |
172 | } | |
173 | ||
174 | qemu_del_vm_change_state_handler(blk->vmsh); | |
175 | blk->vmsh = NULL; | |
176 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
177 | if (local_err) { | |
178 | error_report_err(local_err); | |
179 | } | |
180 | } | |
181 | ||
4417ab7a KW |
182 | /* |
183 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
184 | * devices can tighten their permissions in response (specifically revoke | |
185 | * shared write permissions that we needed for storage migration). | |
186 | * | |
187 | * If an error is returned, the VM cannot be allowed to be resumed. | |
188 | */ | |
189 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
190 | { | |
191 | BlockBackend *blk = child->opaque; | |
192 | Error *local_err = NULL; | |
492a1196 | 193 | uint64_t saved_shared_perm; |
4417ab7a KW |
194 | |
195 | if (!blk->disable_perm) { | |
196 | return; | |
197 | } | |
198 | ||
199 | blk->disable_perm = false; | |
200 | ||
492a1196 HR |
201 | /* |
202 | * blk->shared_perm contains the permissions we want to share once | |
203 | * migration is really completely done. For now, we need to share | |
204 | * all; but we also need to retain blk->shared_perm, which is | |
205 | * overwritten by a successful blk_set_perm() call. Save it and | |
206 | * restore it below. | |
207 | */ | |
208 | saved_shared_perm = blk->shared_perm; | |
209 | ||
5f7772c4 FZ |
210 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
211 | if (local_err) { | |
212 | error_propagate(errp, local_err); | |
213 | blk->disable_perm = true; | |
214 | return; | |
215 | } | |
492a1196 | 216 | blk->shared_perm = saved_shared_perm; |
5f7772c4 FZ |
217 | |
218 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
219 | /* Activation can happen when migration process is still active, for | |
220 | * example when nbd_server_add is called during non-shared storage | |
221 | * migration. Defer the shared_perm update to migration completion. */ | |
222 | if (!blk->vmsh) { | |
223 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
224 | blk); | |
225 | } | |
226 | return; | |
227 | } | |
228 | ||
4417ab7a KW |
229 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
230 | if (local_err) { | |
231 | error_propagate(errp, local_err); | |
232 | blk->disable_perm = true; | |
233 | return; | |
234 | } | |
235 | } | |
236 | ||
ca2e2144 FZ |
237 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
238 | { | |
0439c5a4 | 239 | GLOBAL_STATE_CODE(); |
ca2e2144 FZ |
240 | blk->force_allow_inactivate = true; |
241 | } | |
242 | ||
c16de8f5 FZ |
243 | static bool blk_can_inactivate(BlockBackend *blk) |
244 | { | |
ca2e2144 | 245 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
246 | if (blk->dev || blk_name(blk)[0]) { |
247 | return true; | |
248 | } | |
249 | ||
ca2e2144 FZ |
250 | /* Inactivating means no more writes to the image can be done, |
251 | * even if those writes would be changes invisible to the | |
252 | * guest. For block job BBs that satisfy this, we can just allow | |
253 | * it. This is the case for mirror job source, which is required | |
254 | * by libvirt non-shared block migration. */ | |
255 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
256 | return true; | |
257 | } | |
258 | ||
259 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
260 | } |
261 | ||
cfa1a572 KW |
262 | static int blk_root_inactivate(BdrvChild *child) |
263 | { | |
264 | BlockBackend *blk = child->opaque; | |
265 | ||
266 | if (blk->disable_perm) { | |
267 | return 0; | |
268 | } | |
269 | ||
c16de8f5 | 270 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
271 | return -EPERM; |
272 | } | |
273 | ||
274 | blk->disable_perm = true; | |
275 | if (blk->root) { | |
276 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
277 | } | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
d03654ea SH |
282 | static void blk_root_attach(BdrvChild *child) |
283 | { | |
284 | BlockBackend *blk = child->opaque; | |
285 | BlockBackendAioNotifier *notifier; | |
286 | ||
287 | trace_blk_root_attach(child, blk, child->bs); | |
288 | ||
289 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
290 | bdrv_add_aio_context_notifier(child->bs, | |
291 | notifier->attached_aio_context, | |
292 | notifier->detach_aio_context, | |
293 | notifier->opaque); | |
294 | } | |
295 | } | |
296 | ||
297 | static void blk_root_detach(BdrvChild *child) | |
298 | { | |
299 | BlockBackend *blk = child->opaque; | |
300 | BlockBackendAioNotifier *notifier; | |
301 | ||
302 | trace_blk_root_detach(child, blk, child->bs); | |
303 | ||
304 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
305 | bdrv_remove_aio_context_notifier(child->bs, | |
306 | notifier->attached_aio_context, | |
307 | notifier->detach_aio_context, | |
308 | notifier->opaque); | |
309 | } | |
310 | } | |
311 | ||
3ca1f322 VSO |
312 | static AioContext *blk_root_get_parent_aio_context(BdrvChild *c) |
313 | { | |
314 | BlockBackend *blk = c->opaque; | |
d5f8d79c | 315 | IO_CODE(); |
3ca1f322 VSO |
316 | |
317 | return blk_get_aio_context(blk); | |
318 | } | |
319 | ||
bd86fb99 | 320 | static const BdrvChildClass child_root = { |
c2066af0 KW |
321 | .inherit_options = blk_root_inherit_options, |
322 | ||
5c8cab48 KW |
323 | .change_media = blk_root_change_media, |
324 | .resize = blk_root_resize, | |
4c265bf9 | 325 | .get_name = blk_root_get_name, |
b5411555 | 326 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 327 | |
c2066af0 | 328 | .drained_begin = blk_root_drained_begin, |
fe5258a5 | 329 | .drained_poll = blk_root_drained_poll, |
c2066af0 | 330 | .drained_end = blk_root_drained_end, |
4417ab7a KW |
331 | |
332 | .activate = blk_root_activate, | |
cfa1a572 | 333 | .inactivate = blk_root_inactivate, |
d03654ea SH |
334 | |
335 | .attach = blk_root_attach, | |
336 | .detach = blk_root_detach, | |
38475269 | 337 | |
33949396 | 338 | .change_aio_ctx = blk_root_change_aio_ctx, |
3ca1f322 VSO |
339 | |
340 | .get_parent_aio_context = blk_root_get_parent_aio_context, | |
f21d96d0 KW |
341 | }; |
342 | ||
26f54e9a | 343 | /* |
efaa7c4e | 344 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
345 | * |
346 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
347 | * to request for a block driver node that is attached to this BlockBackend. | |
348 | * @shared_perm is a bitmask which describes which permissions may be granted | |
349 | * to other users of the attached node. | |
350 | * Both sets of permissions can be changed later using blk_set_perm(). | |
351 | * | |
26f54e9a MA |
352 | * Return the new BlockBackend on success, null on failure. |
353 | */ | |
d861ab3a | 354 | BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
355 | { |
356 | BlockBackend *blk; | |
357 | ||
0439c5a4 EGE |
358 | GLOBAL_STATE_CODE(); |
359 | ||
26f54e9a | 360 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 361 | blk->refcnt = 1; |
d861ab3a | 362 | blk->ctx = ctx; |
6d0eb64d KW |
363 | blk->perm = perm; |
364 | blk->shared_perm = shared_perm; | |
0c3169df KW |
365 | blk_set_enable_write_cache(blk, true); |
366 | ||
cb53460b KW |
367 | blk->on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
368 | blk->on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
369 | ||
9caa6f3d | 370 | block_acct_init(&blk->stats); |
27ccdd52 | 371 | |
407ae2ae | 372 | qemu_mutex_init(&blk->queued_requests_lock); |
cf312932 | 373 | qemu_co_queue_init(&blk->queued_requests); |
3301f6c6 HR |
374 | notifier_list_init(&blk->remove_bs_notifiers); |
375 | notifier_list_init(&blk->insert_bs_notifiers); | |
d03654ea | 376 | QLIST_INIT(&blk->aio_notifiers); |
27ccdd52 | 377 | |
2cf22d6a | 378 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
379 | return blk; |
380 | } | |
381 | ||
a3aeeab5 EB |
382 | /* |
383 | * Create a new BlockBackend connected to an existing BlockDriverState. | |
384 | * | |
385 | * @perm is a bitmasks of BLK_PERM_* constants which describes the | |
386 | * permissions to request for @bs that is attached to this | |
387 | * BlockBackend. @shared_perm is a bitmask which describes which | |
388 | * permissions may be granted to other users of the attached node. | |
389 | * Both sets of permissions can be changed later using blk_set_perm(). | |
390 | * | |
391 | * Return the new BlockBackend on success, null on failure. | |
4c20dd24 KW |
392 | * |
393 | * Callers must hold the AioContext lock of @bs. | |
a3aeeab5 EB |
394 | */ |
395 | BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm, | |
396 | uint64_t shared_perm, Error **errp) | |
397 | { | |
398 | BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm); | |
399 | ||
0439c5a4 EGE |
400 | GLOBAL_STATE_CODE(); |
401 | ||
a3aeeab5 EB |
402 | if (blk_insert_bs(blk, bs, errp) < 0) { |
403 | blk_unref(blk); | |
404 | return NULL; | |
405 | } | |
406 | return blk; | |
407 | } | |
408 | ||
7e7d56d9 | 409 | /* |
28eb9b12 | 410 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
4c20dd24 KW |
411 | * By default, the new BlockBackend is in the main AioContext, but if the |
412 | * parameters connect it with any existing node in a different AioContext, it | |
413 | * may end up there instead. | |
ca49a4fd HR |
414 | * |
415 | * Just as with bdrv_open(), after having called this function the reference to | |
416 | * @options belongs to the block layer (even on failure). | |
417 | * | |
4c20dd24 KW |
418 | * Called without holding an AioContext lock. |
419 | * | |
ca49a4fd HR |
420 | * TODO: Remove @filename and @flags; it should be possible to specify a whole |
421 | * BDS tree just by specifying the @options QDict (or @reference, | |
422 | * alternatively). At the time of adding this function, this is not possible, | |
423 | * though, so callers of this function have to be able to specify @filename and | |
424 | * @flags. | |
425 | */ | |
efaa7c4e HR |
426 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
427 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
428 | { |
429 | BlockBackend *blk; | |
28eb9b12 | 430 | BlockDriverState *bs; |
4c20dd24 | 431 | AioContext *ctx; |
1f4ad7d3 | 432 | uint64_t perm = 0; |
35b7f4ab | 433 | uint64_t shared = BLK_PERM_ALL; |
c62d32f5 | 434 | |
0439c5a4 EGE |
435 | GLOBAL_STATE_CODE(); |
436 | ||
35b7f4ab KW |
437 | /* |
438 | * blk_new_open() is mainly used in .bdrv_create implementations and the | |
439 | * tools where sharing isn't a major concern because the BDS stays private | |
440 | * and the file is generally not supposed to be used by a second process, | |
441 | * so we just request permission according to the flags. | |
c62d32f5 KW |
442 | * |
443 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
444 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
445 | * shouldn't hurt either. We can still share everything here because the | |
35b7f4ab KW |
446 | * guest devices will add their own blockers if they can't share. |
447 | */ | |
1f4ad7d3 KW |
448 | if ((flags & BDRV_O_NO_IO) == 0) { |
449 | perm |= BLK_PERM_CONSISTENT_READ; | |
450 | if (flags & BDRV_O_RDWR) { | |
451 | perm |= BLK_PERM_WRITE; | |
452 | } | |
c62d32f5 KW |
453 | } |
454 | if (flags & BDRV_O_RESIZE) { | |
455 | perm |= BLK_PERM_RESIZE; | |
456 | } | |
35b7f4ab KW |
457 | if (flags & BDRV_O_NO_SHARE) { |
458 | shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; | |
459 | } | |
ca49a4fd | 460 | |
c6e0a6de | 461 | aio_context_acquire(qemu_get_aio_context()); |
5b363937 | 462 | bs = bdrv_open(filename, reference, options, flags, errp); |
c6e0a6de | 463 | aio_context_release(qemu_get_aio_context()); |
5b363937 | 464 | if (!bs) { |
ca49a4fd HR |
465 | return NULL; |
466 | } | |
467 | ||
4c20dd24 KW |
468 | /* bdrv_open() could have moved bs to a different AioContext */ |
469 | ctx = bdrv_get_aio_context(bs); | |
470 | blk = blk_new(bdrv_get_aio_context(bs), perm, shared); | |
471 | blk->perm = perm; | |
472 | blk->shared_perm = shared; | |
473 | ||
474 | aio_context_acquire(ctx); | |
475 | blk_insert_bs(blk, bs, errp); | |
476 | bdrv_unref(bs); | |
477 | aio_context_release(ctx); | |
478 | ||
50bfbe93 | 479 | if (!blk->root) { |
50bfbe93 FZ |
480 | blk_unref(blk); |
481 | return NULL; | |
482 | } | |
72e775c7 | 483 | |
ca49a4fd HR |
484 | return blk; |
485 | } | |
486 | ||
26f54e9a MA |
487 | static void blk_delete(BlockBackend *blk) |
488 | { | |
489 | assert(!blk->refcnt); | |
e5e78550 | 490 | assert(!blk->name); |
a7f53e26 | 491 | assert(!blk->dev); |
022cdc9f | 492 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
493 | blk_io_limits_disable(blk); |
494 | } | |
f21d96d0 | 495 | if (blk->root) { |
13855c6b | 496 | blk_remove_bs(blk); |
7e7d56d9 | 497 | } |
5f7772c4 FZ |
498 | if (blk->vmsh) { |
499 | qemu_del_vm_change_state_handler(blk->vmsh); | |
500 | blk->vmsh = NULL; | |
501 | } | |
3301f6c6 HR |
502 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
503 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 504 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
407ae2ae SH |
505 | assert(qemu_co_queue_empty(&blk->queued_requests)); |
506 | qemu_mutex_destroy(&blk->queued_requests_lock); | |
2cf22d6a | 507 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 508 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 509 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
510 | g_free(blk); |
511 | } | |
512 | ||
8fb3c76c MA |
513 | static void drive_info_del(DriveInfo *dinfo) |
514 | { | |
515 | if (!dinfo) { | |
516 | return; | |
517 | } | |
518 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
519 | g_free(dinfo); |
520 | } | |
521 | ||
f636ae85 AG |
522 | int blk_get_refcnt(BlockBackend *blk) |
523 | { | |
0439c5a4 | 524 | GLOBAL_STATE_CODE(); |
f636ae85 AG |
525 | return blk ? blk->refcnt : 0; |
526 | } | |
527 | ||
26f54e9a MA |
528 | /* |
529 | * Increment @blk's reference count. | |
530 | * @blk must not be null. | |
531 | */ | |
532 | void blk_ref(BlockBackend *blk) | |
533 | { | |
5ca9d21b | 534 | assert(blk->refcnt > 0); |
0439c5a4 | 535 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
536 | blk->refcnt++; |
537 | } | |
538 | ||
539 | /* | |
540 | * Decrement @blk's reference count. | |
541 | * If this drops it to zero, destroy @blk. | |
542 | * For convenience, do nothing if @blk is null. | |
543 | */ | |
544 | void blk_unref(BlockBackend *blk) | |
545 | { | |
0439c5a4 | 546 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
547 | if (blk) { |
548 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
549 | if (blk->refcnt > 1) { |
550 | blk->refcnt--; | |
551 | } else { | |
552 | blk_drain(blk); | |
553 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
554 | assert(blk->refcnt == 1); | |
555 | blk->refcnt = 0; | |
26f54e9a MA |
556 | blk_delete(blk); |
557 | } | |
558 | } | |
559 | } | |
560 | ||
2cf22d6a HR |
561 | /* |
562 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
563 | * ones which are hidden (i.e. are not referenced by the monitor). | |
564 | */ | |
a429b9b5 | 565 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a | 566 | { |
0439c5a4 | 567 | GLOBAL_STATE_CODE(); |
2cf22d6a HR |
568 | return blk ? QTAILQ_NEXT(blk, link) |
569 | : QTAILQ_FIRST(&block_backends); | |
570 | } | |
571 | ||
d8da3cef HR |
572 | void blk_remove_all_bs(void) |
573 | { | |
74d1b8fc | 574 | BlockBackend *blk = NULL; |
d8da3cef | 575 | |
0439c5a4 EGE |
576 | GLOBAL_STATE_CODE(); |
577 | ||
2cf22d6a | 578 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
579 | AioContext *ctx = blk_get_aio_context(blk); |
580 | ||
581 | aio_context_acquire(ctx); | |
f21d96d0 | 582 | if (blk->root) { |
d8da3cef HR |
583 | blk_remove_bs(blk); |
584 | } | |
585 | aio_context_release(ctx); | |
586 | } | |
587 | } | |
588 | ||
26f54e9a | 589 | /* |
9492b0b9 | 590 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
591 | * If @blk is null, return the first one. |
592 | * Else, return @blk's next sibling, which may be null. | |
593 | * | |
594 | * To iterate over all BlockBackends, do | |
595 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
596 | * ... | |
597 | * } | |
598 | */ | |
599 | BlockBackend *blk_next(BlockBackend *blk) | |
600 | { | |
0439c5a4 | 601 | GLOBAL_STATE_CODE(); |
9492b0b9 HR |
602 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
603 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
604 | } |
605 | ||
7c8eece4 KW |
606 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
607 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 608 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 609 | { |
5e003f17 HR |
610 | BlockDriverState *bs, *old_bs; |
611 | ||
612 | /* Must be called from the main loop */ | |
613 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 614 | |
7c8eece4 KW |
615 | /* First, return all root nodes of BlockBackends. In order to avoid |
616 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
617 | * if the BB is the first one in the parent list of the BDS. */ | |
618 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
619 | BlockBackend *old_blk = it->blk; |
620 | ||
621 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
622 | ||
7c8eece4 KW |
623 | do { |
624 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
625 | bs = it->blk ? blk_bs(it->blk) : NULL; |
626 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 627 | |
5e003f17 HR |
628 | if (it->blk) { |
629 | blk_ref(it->blk); | |
630 | } | |
631 | blk_unref(old_blk); | |
632 | ||
88be7b4b | 633 | if (bs) { |
5e003f17 HR |
634 | bdrv_ref(bs); |
635 | bdrv_unref(old_bs); | |
88be7b4b | 636 | return bs; |
7c8eece4 KW |
637 | } |
638 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
639 | } else { |
640 | old_bs = it->bs; | |
7c8eece4 KW |
641 | } |
642 | ||
643 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
644 | * BDSes that are attached to a BlockBackend here; they have been handled | |
645 | * by the above block already */ | |
981f4f57 | 646 | do { |
7c8eece4 | 647 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
648 | bs = it->bs; |
649 | } while (bs && bdrv_has_blk(bs)); | |
650 | ||
5e003f17 HR |
651 | if (bs) { |
652 | bdrv_ref(bs); | |
653 | } | |
654 | bdrv_unref(old_bs); | |
655 | ||
88be7b4b KW |
656 | return bs; |
657 | } | |
658 | ||
5e003f17 | 659 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
660 | { |
661 | *it = (BdrvNextIterator) { | |
662 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
663 | }; | |
5e003f17 | 664 | } |
981f4f57 | 665 | |
5e003f17 HR |
666 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
667 | { | |
0439c5a4 | 668 | GLOBAL_STATE_CODE(); |
5e003f17 | 669 | bdrv_next_reset(it); |
88be7b4b | 670 | return bdrv_next(it); |
981f4f57 HR |
671 | } |
672 | ||
5e003f17 HR |
673 | /* Must be called when aborting a bdrv_next() iteration before |
674 | * bdrv_next() returns NULL */ | |
675 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
676 | { | |
677 | /* Must be called from the main loop */ | |
678 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
679 | ||
680 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
681 | if (it->blk) { | |
682 | bdrv_unref(blk_bs(it->blk)); | |
683 | blk_unref(it->blk); | |
684 | } | |
685 | } else { | |
686 | bdrv_unref(it->bs); | |
687 | } | |
688 | ||
689 | bdrv_next_reset(it); | |
690 | } | |
691 | ||
e5e78550 HR |
692 | /* |
693 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
694 | * the given @name acting as the handle for the monitor. | |
695 | * Strictly for use by blockdev.c. | |
696 | * | |
697 | * @name must not be null or empty. | |
698 | * | |
699 | * Returns true on success and false on failure. In the latter case, an Error | |
700 | * object is returned through @errp. | |
701 | */ | |
702 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
703 | { | |
704 | assert(!blk->name); | |
705 | assert(name && name[0]); | |
0439c5a4 | 706 | GLOBAL_STATE_CODE(); |
e5e78550 HR |
707 | |
708 | if (!id_wellformed(name)) { | |
709 | error_setg(errp, "Invalid device name"); | |
710 | return false; | |
711 | } | |
712 | if (blk_by_name(name)) { | |
713 | error_setg(errp, "Device with id '%s' already exists", name); | |
714 | return false; | |
715 | } | |
716 | if (bdrv_find_node(name)) { | |
717 | error_setg(errp, | |
718 | "Device name '%s' conflicts with an existing node name", | |
719 | name); | |
720 | return false; | |
721 | } | |
722 | ||
723 | blk->name = g_strdup(name); | |
724 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
725 | return true; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
730 | * Strictly for use by blockdev.c. | |
731 | */ | |
732 | void monitor_remove_blk(BlockBackend *blk) | |
733 | { | |
0439c5a4 EGE |
734 | GLOBAL_STATE_CODE(); |
735 | ||
e5e78550 HR |
736 | if (!blk->name) { |
737 | return; | |
738 | } | |
739 | ||
740 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
741 | g_free(blk->name); | |
742 | blk->name = NULL; | |
743 | } | |
744 | ||
26f54e9a | 745 | /* |
7e7d56d9 | 746 | * Return @blk's name, a non-null string. |
e5e78550 | 747 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 748 | */ |
0731a50f | 749 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 750 | { |
37868b2a | 751 | IO_CODE(); |
e5e78550 | 752 | return blk->name ?: ""; |
26f54e9a MA |
753 | } |
754 | ||
755 | /* | |
756 | * Return the BlockBackend with name @name if it exists, else null. | |
757 | * @name must not be null. | |
758 | */ | |
759 | BlockBackend *blk_by_name(const char *name) | |
760 | { | |
74d1b8fc | 761 | BlockBackend *blk = NULL; |
26f54e9a | 762 | |
0439c5a4 | 763 | GLOBAL_STATE_CODE(); |
26f54e9a | 764 | assert(name); |
74d1b8fc | 765 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
766 | if (!strcmp(name, blk->name)) { |
767 | return blk; | |
768 | } | |
769 | } | |
770 | return NULL; | |
771 | } | |
7e7d56d9 MA |
772 | |
773 | /* | |
774 | * Return the BlockDriverState attached to @blk if any, else null. | |
775 | */ | |
776 | BlockDriverState *blk_bs(BlockBackend *blk) | |
777 | { | |
37868b2a | 778 | IO_CODE(); |
f21d96d0 | 779 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
780 | } |
781 | ||
7c8eece4 | 782 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
783 | { |
784 | BdrvChild *child; | |
bdb73476 EGE |
785 | |
786 | GLOBAL_STATE_CODE(); | |
787 | ||
dde33812 | 788 | QLIST_FOREACH(child, &bs->parents, next_parent) { |
bd86fb99 | 789 | if (child->klass == &child_root) { |
7c8eece4 | 790 | return child->opaque; |
dde33812 KW |
791 | } |
792 | } | |
793 | ||
7c8eece4 KW |
794 | return NULL; |
795 | } | |
796 | ||
797 | /* | |
798 | * Returns true if @bs has an associated BlockBackend. | |
799 | */ | |
800 | bool bdrv_has_blk(BlockDriverState *bs) | |
801 | { | |
0439c5a4 | 802 | GLOBAL_STATE_CODE(); |
7c8eece4 | 803 | return bdrv_first_blk(bs) != NULL; |
dde33812 KW |
804 | } |
805 | ||
b6c1bae5 KW |
806 | /* |
807 | * Returns true if @bs has only BlockBackends as parents. | |
808 | */ | |
809 | bool bdrv_is_root_node(BlockDriverState *bs) | |
810 | { | |
811 | BdrvChild *c; | |
812 | ||
0439c5a4 | 813 | GLOBAL_STATE_CODE(); |
b6c1bae5 | 814 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
bd86fb99 | 815 | if (c->klass != &child_root) { |
b6c1bae5 KW |
816 | return false; |
817 | } | |
818 | } | |
819 | ||
820 | return true; | |
821 | } | |
822 | ||
18e46a03 MA |
823 | /* |
824 | * Return @blk's DriveInfo if any, else null. | |
825 | */ | |
826 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
827 | { | |
c5be7445 | 828 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
829 | return blk->legacy_dinfo; |
830 | } | |
831 | ||
832 | /* | |
833 | * Set @blk's DriveInfo to @dinfo, and return it. | |
834 | * @blk must not have a DriveInfo set already. | |
835 | * No other BlockBackend may have the same DriveInfo set. | |
836 | */ | |
837 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
838 | { | |
839 | assert(!blk->legacy_dinfo); | |
c5be7445 | 840 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
841 | return blk->legacy_dinfo = dinfo; |
842 | } | |
843 | ||
844 | /* | |
845 | * Return the BlockBackend with DriveInfo @dinfo. | |
846 | * It must exist. | |
847 | */ | |
848 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
849 | { | |
74d1b8fc | 850 | BlockBackend *blk = NULL; |
c5be7445 | 851 | GLOBAL_STATE_CODE(); |
18e46a03 | 852 | |
74d1b8fc | 853 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
854 | if (blk->legacy_dinfo == dinfo) { |
855 | return blk; | |
856 | } | |
857 | } | |
858 | abort(); | |
859 | } | |
860 | ||
f2cd875d KW |
861 | /* |
862 | * Returns a pointer to the publicly accessible fields of @blk. | |
863 | */ | |
864 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
865 | { | |
0439c5a4 | 866 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
867 | return &blk->public; |
868 | } | |
869 | ||
870 | /* | |
871 | * Returns a BlockBackend given the associated @public fields. | |
872 | */ | |
873 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
874 | { | |
0439c5a4 | 875 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
876 | return container_of(public, BlockBackend, public); |
877 | } | |
878 | ||
1c95f7e1 HR |
879 | /* |
880 | * Disassociates the currently associated BlockDriverState from @blk. | |
881 | */ | |
882 | void blk_remove_bs(BlockBackend *blk) | |
883 | { | |
c89bcf3a | 884 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
e6cada92 | 885 | BdrvChild *root; |
022cdc9f | 886 | |
0439c5a4 EGE |
887 | GLOBAL_STATE_CODE(); |
888 | ||
3301f6c6 | 889 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 890 | if (tgm->throttle_state) { |
1e3552db SH |
891 | BlockDriverState *bs = blk_bs(blk); |
892 | ||
893 | /* | |
894 | * Take a ref in case blk_bs() changes across bdrv_drained_begin(), for | |
895 | * example, if a temporary filter node is removed by a blockjob. | |
896 | */ | |
897 | bdrv_ref(bs); | |
632a7735 | 898 | bdrv_drained_begin(bs); |
c89bcf3a AG |
899 | throttle_group_detach_aio_context(tgm); |
900 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 901 | bdrv_drained_end(bs); |
1e3552db | 902 | bdrv_unref(bs); |
a5614993 | 903 | } |
1c95f7e1 | 904 | |
7ca7f0f6 KW |
905 | blk_update_root_state(blk); |
906 | ||
f45280cb GK |
907 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
908 | * switch to a completion coroutine later on. Let's drain all I/O here | |
909 | * to avoid that and a potential QEMU crash. | |
910 | */ | |
911 | blk_drain(blk); | |
e6cada92 | 912 | root = blk->root; |
f21d96d0 | 913 | blk->root = NULL; |
e6cada92 | 914 | bdrv_root_unref_child(root); |
1c95f7e1 HR |
915 | } |
916 | ||
0c3c36d6 HR |
917 | /* |
918 | * Associates a new BlockDriverState with @blk. | |
4c20dd24 KW |
919 | * |
920 | * Callers must hold the AioContext lock of @bs. | |
0c3c36d6 | 921 | */ |
d7086422 | 922 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 923 | { |
c89bcf3a | 924 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
0439c5a4 | 925 | GLOBAL_STATE_CODE(); |
b441dc71 | 926 | bdrv_ref(bs); |
1f38f04e HR |
927 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
928 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
228ca37e | 929 | blk->perm, blk->shared_perm, |
1f38f04e | 930 | blk, errp); |
d7086422 KW |
931 | if (blk->root == NULL) { |
932 | return -EPERM; | |
933 | } | |
3301f6c6 HR |
934 | |
935 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
936 | if (tgm->throttle_state) { |
937 | throttle_group_detach_aio_context(tgm); | |
938 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 939 | } |
d7086422 KW |
940 | |
941 | return 0; | |
0c3c36d6 HR |
942 | } |
943 | ||
ed089506 VSO |
944 | /* |
945 | * Change BlockDriverState associated with @blk. | |
946 | */ | |
947 | int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp) | |
948 | { | |
0439c5a4 | 949 | GLOBAL_STATE_CODE(); |
ed089506 VSO |
950 | return bdrv_replace_child_bs(blk->root, new_bs, errp); |
951 | } | |
952 | ||
981776b3 KW |
953 | /* |
954 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
955 | */ | |
956 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
957 | Error **errp) | |
958 | { | |
959 | int ret; | |
0439c5a4 | 960 | GLOBAL_STATE_CODE(); |
981776b3 | 961 | |
d35ff5e6 | 962 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
963 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
964 | if (ret < 0) { | |
965 | return ret; | |
966 | } | |
967 | } | |
968 | ||
969 | blk->perm = perm; | |
970 | blk->shared_perm = shared_perm; | |
971 | ||
972 | return 0; | |
973 | } | |
974 | ||
887354bd KW |
975 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
976 | { | |
0439c5a4 | 977 | GLOBAL_STATE_CODE(); |
887354bd KW |
978 | *perm = blk->perm; |
979 | *shared_perm = blk->shared_perm; | |
980 | } | |
981 | ||
d09ea2d2 TH |
982 | /* |
983 | * Attach device model @dev to @blk. | |
984 | * Return 0 on success, -EBUSY when a device model is attached already. | |
985 | */ | |
986 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
4be74634 | 987 | { |
0439c5a4 | 988 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
989 | if (blk->dev) { |
990 | return -EBUSY; | |
991 | } | |
d35ff5e6 KW |
992 | |
993 | /* While migration is still incoming, we don't need to apply the | |
994 | * permissions of guest device BlockBackends. We might still have a block | |
995 | * job or NBD server writing to the image for storage migration. */ | |
996 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
997 | blk->disable_perm = true; | |
998 | } | |
999 | ||
84ebe375 | 1000 | blk_ref(blk); |
a7f53e26 | 1001 | blk->dev = dev; |
373340b2 | 1002 | blk_iostatus_reset(blk); |
d35ff5e6 | 1003 | |
a7f53e26 | 1004 | return 0; |
4be74634 MA |
1005 | } |
1006 | ||
a7f53e26 MA |
1007 | /* |
1008 | * Detach device model @dev from @blk. | |
1009 | * @dev must be currently attached to @blk. | |
1010 | */ | |
d09ea2d2 | 1011 | void blk_detach_dev(BlockBackend *blk, DeviceState *dev) |
4be74634 | 1012 | { |
a7f53e26 | 1013 | assert(blk->dev == dev); |
0439c5a4 | 1014 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1015 | blk->dev = NULL; |
1016 | blk->dev_ops = NULL; | |
1017 | blk->dev_opaque = NULL; | |
981776b3 | 1018 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 1019 | blk_unref(blk); |
4be74634 MA |
1020 | } |
1021 | ||
a7f53e26 MA |
1022 | /* |
1023 | * Return the device model attached to @blk if any, else null. | |
1024 | */ | |
d09ea2d2 | 1025 | DeviceState *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 | 1026 | { |
0439c5a4 | 1027 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1028 | return blk->dev; |
1029 | } | |
1030 | ||
2d76e724 KW |
1031 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
1032 | * device attached to the BlockBackend. */ | |
77beef83 | 1033 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 | 1034 | { |
d09ea2d2 | 1035 | DeviceState *dev = blk->dev; |
37868b2a | 1036 | IO_CODE(); |
2d76e724 KW |
1037 | |
1038 | if (!dev) { | |
1039 | return g_strdup(""); | |
1040 | } else if (dev->id) { | |
1041 | return g_strdup(dev->id); | |
1042 | } | |
602414d1 LM |
1043 | |
1044 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
1045 | } |
1046 | ||
1c89e1fa KW |
1047 | /* |
1048 | * Return the BlockBackend which has the device model @dev attached if it | |
1049 | * exists, else null. | |
1050 | * | |
1051 | * @dev must not be null. | |
1052 | */ | |
1053 | BlockBackend *blk_by_dev(void *dev) | |
1054 | { | |
1055 | BlockBackend *blk = NULL; | |
1056 | ||
0439c5a4 EGE |
1057 | GLOBAL_STATE_CODE(); |
1058 | ||
1c89e1fa KW |
1059 | assert(dev != NULL); |
1060 | while ((blk = blk_all_next(blk)) != NULL) { | |
1061 | if (blk->dev == dev) { | |
1062 | return blk; | |
1063 | } | |
1064 | } | |
1065 | return NULL; | |
1066 | } | |
1067 | ||
a7f53e26 MA |
1068 | /* |
1069 | * Set @blk's device model callbacks to @ops. | |
1070 | * @opaque is the opaque argument to pass to the callbacks. | |
1071 | * This is for use by device models. | |
1072 | */ | |
1073 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
1074 | void *opaque) | |
1075 | { | |
0439c5a4 | 1076 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1077 | blk->dev_ops = ops; |
1078 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
1079 | |
1080 | /* Are we currently quiesced? Should we enforce this right now? */ | |
c4d5bf99 | 1081 | if (qatomic_read(&blk->quiesce_counter) && ops && ops->drained_begin) { |
f4d9cc88 JS |
1082 | ops->drained_begin(opaque); |
1083 | } | |
a7f53e26 MA |
1084 | } |
1085 | ||
1086 | /* | |
1087 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
1088 | * |
1089 | * If @load is true, notify of media load. This action can fail, meaning that | |
1090 | * the medium cannot be loaded. @errp is set then. | |
1091 | * | |
1092 | * If @load is false, notify of media eject. This can never fail. | |
1093 | * | |
a7f53e26 MA |
1094 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
1095 | */ | |
39829a01 | 1096 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 | 1097 | { |
0439c5a4 | 1098 | GLOBAL_STATE_CODE(); |
a7f53e26 | 1099 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { |
f1f57066 | 1100 | bool tray_was_open, tray_is_open; |
39829a01 | 1101 | Error *local_err = NULL; |
a7f53e26 | 1102 | |
f1f57066 | 1103 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
1104 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
1105 | if (local_err) { | |
1106 | assert(load == true); | |
1107 | error_propagate(errp, local_err); | |
1108 | return; | |
1109 | } | |
f1f57066 HR |
1110 | tray_is_open = blk_dev_is_tray_open(blk); |
1111 | ||
1112 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 1113 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 1114 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 1115 | g_free(id); |
a7f53e26 MA |
1116 | } |
1117 | } | |
1118 | } | |
1119 | ||
5c8cab48 KW |
1120 | static void blk_root_change_media(BdrvChild *child, bool load) |
1121 | { | |
39829a01 | 1122 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
1123 | } |
1124 | ||
a7f53e26 MA |
1125 | /* |
1126 | * Does @blk's attached device model have removable media? | |
1127 | * %true if no device model is attached. | |
1128 | */ | |
1129 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
1130 | { | |
b4ad82aa | 1131 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1132 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); |
1133 | } | |
1134 | ||
8f3a73bc HR |
1135 | /* |
1136 | * Does @blk's attached device model have a tray? | |
1137 | */ | |
1138 | bool blk_dev_has_tray(BlockBackend *blk) | |
1139 | { | |
967d7905 | 1140 | IO_CODE(); |
8f3a73bc HR |
1141 | return blk->dev_ops && blk->dev_ops->is_tray_open; |
1142 | } | |
1143 | ||
a7f53e26 MA |
1144 | /* |
1145 | * Notify @blk's attached device model of a media eject request. | |
1146 | * If @force is true, the medium is about to be yanked out forcefully. | |
1147 | */ | |
1148 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1149 | { |
b4ad82aa | 1150 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1151 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1152 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1153 | } | |
4be74634 MA |
1154 | } |
1155 | ||
a7f53e26 MA |
1156 | /* |
1157 | * Does @blk's attached device model have a tray, and is it open? | |
1158 | */ | |
1159 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1160 | { |
967d7905 | 1161 | IO_CODE(); |
8f3a73bc | 1162 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1163 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1164 | } | |
1165 | return false; | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * Does @blk's attached device model have the medium locked? | |
1170 | * %false if the device model has no such lock. | |
1171 | */ | |
1172 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1173 | { | |
b4ad82aa | 1174 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1175 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { |
1176 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1177 | } | |
1178 | return false; | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * Notify @blk's attached device model of a backend size change. | |
1183 | */ | |
5c8cab48 | 1184 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1185 | { |
5c8cab48 KW |
1186 | BlockBackend *blk = child->opaque; |
1187 | ||
a7f53e26 MA |
1188 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1189 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | void blk_iostatus_enable(BlockBackend *blk) | |
1194 | { | |
0439c5a4 | 1195 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1196 | blk->iostatus_enabled = true; |
1197 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1198 | } | |
1199 | ||
1200 | /* The I/O status is only enabled if the drive explicitly | |
1201 | * enables it _and_ the VM is configured to stop on errors */ | |
1202 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1203 | { | |
37868b2a | 1204 | IO_CODE(); |
373340b2 HR |
1205 | return (blk->iostatus_enabled && |
1206 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1207 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1208 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1209 | } | |
1210 | ||
1211 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1212 | { | |
0439c5a4 | 1213 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1214 | return blk->iostatus; |
1215 | } | |
1216 | ||
1217 | void blk_iostatus_disable(BlockBackend *blk) | |
1218 | { | |
0439c5a4 | 1219 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1220 | blk->iostatus_enabled = false; |
1221 | } | |
1222 | ||
1223 | void blk_iostatus_reset(BlockBackend *blk) | |
1224 | { | |
0439c5a4 | 1225 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1226 | if (blk_iostatus_is_enabled(blk)) { |
1227 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
373340b2 HR |
1228 | } |
1229 | } | |
1230 | ||
1231 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1232 | { | |
37868b2a | 1233 | IO_CODE(); |
373340b2 HR |
1234 | assert(blk_iostatus_is_enabled(blk)); |
1235 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1236 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1237 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1238 | } | |
4be74634 MA |
1239 | } |
1240 | ||
c10c9d96 KW |
1241 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1242 | { | |
37868b2a | 1243 | IO_CODE(); |
c10c9d96 KW |
1244 | blk->allow_write_beyond_eof = allow; |
1245 | } | |
1246 | ||
980b0f94 KW |
1247 | void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow) |
1248 | { | |
37868b2a | 1249 | IO_CODE(); |
980b0f94 KW |
1250 | blk->allow_aio_context_change = allow; |
1251 | } | |
1252 | ||
cf312932 KW |
1253 | void blk_set_disable_request_queuing(BlockBackend *blk, bool disable) |
1254 | { | |
37868b2a | 1255 | IO_CODE(); |
ef80ec50 | 1256 | qatomic_set(&blk->disable_request_queuing, disable); |
cf312932 KW |
1257 | } |
1258 | ||
c73ff92c EGE |
1259 | static int coroutine_fn GRAPH_RDLOCK |
1260 | blk_check_byte_request(BlockBackend *blk, int64_t offset, int64_t bytes) | |
e7f7d676 HR |
1261 | { |
1262 | int64_t len; | |
1263 | ||
aa78b825 | 1264 | if (bytes < 0) { |
e7f7d676 HR |
1265 | return -EIO; |
1266 | } | |
1267 | ||
c73ff92c | 1268 | if (!blk_co_is_available(blk)) { |
e7f7d676 HR |
1269 | return -ENOMEDIUM; |
1270 | } | |
1271 | ||
e7f7d676 HR |
1272 | if (offset < 0) { |
1273 | return -EIO; | |
1274 | } | |
1275 | ||
c10c9d96 | 1276 | if (!blk->allow_write_beyond_eof) { |
bd53086e | 1277 | len = bdrv_co_getlength(blk_bs(blk)); |
c10c9d96 KW |
1278 | if (len < 0) { |
1279 | return len; | |
1280 | } | |
1281 | ||
7242db63 | 1282 | if (offset > len || len - offset < bytes) { |
c10c9d96 KW |
1283 | return -EIO; |
1284 | } | |
e7f7d676 HR |
1285 | } |
1286 | ||
1287 | return 0; | |
1288 | } | |
1289 | ||
7f16476f | 1290 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
cf312932 KW |
1291 | static void coroutine_fn blk_wait_while_drained(BlockBackend *blk) |
1292 | { | |
7f16476f KW |
1293 | assert(blk->in_flight > 0); |
1294 | ||
ef80ec50 SH |
1295 | if (qatomic_read(&blk->quiesce_counter) && |
1296 | !qatomic_read(&blk->disable_request_queuing)) { | |
407ae2ae SH |
1297 | /* |
1298 | * Take lock before decrementing in flight counter so main loop thread | |
1299 | * waits for us to enqueue ourselves before it can leave the drained | |
1300 | * section. | |
1301 | */ | |
1302 | qemu_mutex_lock(&blk->queued_requests_lock); | |
7f16476f | 1303 | blk_dec_in_flight(blk); |
407ae2ae | 1304 | qemu_co_queue_wait(&blk->queued_requests, &blk->queued_requests_lock); |
7f16476f | 1305 | blk_inc_in_flight(blk); |
407ae2ae | 1306 | qemu_mutex_unlock(&blk->queued_requests_lock); |
cf312932 KW |
1307 | } |
1308 | } | |
1309 | ||
fbb92b67 | 1310 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
d1d3fc3d AF |
1311 | static int coroutine_fn |
1312 | blk_co_do_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, | |
1313 | QEMUIOVector *qiov, size_t qiov_offset, | |
1314 | BdrvRequestFlags flags) | |
4be74634 | 1315 | { |
1e98fefd | 1316 | int ret; |
cf312932 | 1317 | BlockDriverState *bs; |
1581a70d | 1318 | IO_CODE(); |
1e98fefd | 1319 | |
cf312932 | 1320 | blk_wait_while_drained(blk); |
b9b10c35 | 1321 | GRAPH_RDLOCK_GUARD(); |
1e98fefd | 1322 | |
cf312932 KW |
1323 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1324 | bs = blk_bs(blk); | |
99723548 | 1325 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1326 | |
1327 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1328 | if (ret < 0) { |
1329 | return ret; | |
1330 | } | |
1331 | ||
99723548 PB |
1332 | bdrv_inc_in_flight(bs); |
1333 | ||
441565b2 | 1334 | /* throttling disk I/O */ |
022cdc9f MP |
1335 | if (blk->public.throttle_group_member.throttle_state) { |
1336 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1337 | bytes, false); | |
441565b2 KW |
1338 | } |
1339 | ||
d1d3fc3d AF |
1340 | ret = bdrv_co_preadv_part(blk->root, offset, bytes, qiov, qiov_offset, |
1341 | flags); | |
99723548 PB |
1342 | bdrv_dec_in_flight(bs); |
1343 | return ret; | |
1bf1cbc9 KW |
1344 | } |
1345 | ||
6f675c93 AF |
1346 | int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset, int64_t bytes, |
1347 | void *buf, BdrvRequestFlags flags) | |
1348 | { | |
1349 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1350 | IO_OR_GS_CODE(); | |
1351 | ||
1352 | assert(bytes <= SIZE_MAX); | |
1353 | ||
1354 | return blk_co_preadv(blk, offset, bytes, &qiov, flags); | |
1355 | } | |
1356 | ||
fbb92b67 | 1357 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
95479077 | 1358 | int64_t bytes, QEMUIOVector *qiov, |
fbb92b67 KW |
1359 | BdrvRequestFlags flags) |
1360 | { | |
1361 | int ret; | |
37868b2a | 1362 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1363 | |
1364 | blk_inc_in_flight(blk); | |
d1d3fc3d AF |
1365 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, 0, flags); |
1366 | blk_dec_in_flight(blk); | |
1367 | ||
1368 | return ret; | |
1369 | } | |
1370 | ||
1371 | int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset, | |
1372 | int64_t bytes, QEMUIOVector *qiov, | |
1373 | size_t qiov_offset, BdrvRequestFlags flags) | |
1374 | { | |
1375 | int ret; | |
1376 | IO_OR_GS_CODE(); | |
1377 | ||
1378 | blk_inc_in_flight(blk); | |
1379 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, qiov_offset, flags); | |
fbb92b67 KW |
1380 | blk_dec_in_flight(blk); |
1381 | ||
1382 | return ret; | |
1383 | } | |
1384 | ||
1385 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ | |
07a64aa4 | 1386 | static int coroutine_fn |
70e8775e VSO |
1387 | blk_co_do_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, |
1388 | QEMUIOVector *qiov, size_t qiov_offset, | |
1389 | BdrvRequestFlags flags) | |
a8823a3b | 1390 | { |
bfd18d1e | 1391 | int ret; |
cf312932 | 1392 | BlockDriverState *bs; |
1581a70d | 1393 | IO_CODE(); |
bfd18d1e | 1394 | |
cf312932 | 1395 | blk_wait_while_drained(blk); |
b9b10c35 | 1396 | GRAPH_RDLOCK_GUARD(); |
bfd18d1e | 1397 | |
cf312932 KW |
1398 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1399 | bs = blk_bs(blk); | |
99723548 | 1400 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1401 | |
bfd18d1e | 1402 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1403 | if (ret < 0) { |
1404 | return ret; | |
1405 | } | |
1406 | ||
99723548 | 1407 | bdrv_inc_in_flight(bs); |
441565b2 | 1408 | /* throttling disk I/O */ |
022cdc9f MP |
1409 | if (blk->public.throttle_group_member.throttle_state) { |
1410 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1411 | bytes, true); | |
441565b2 KW |
1412 | } |
1413 | ||
bfd18d1e KW |
1414 | if (!blk->enable_write_cache) { |
1415 | flags |= BDRV_REQ_FUA; | |
1416 | } | |
1417 | ||
b3016864 VSO |
1418 | ret = bdrv_co_pwritev_part(blk->root, offset, bytes, qiov, qiov_offset, |
1419 | flags); | |
99723548 PB |
1420 | bdrv_dec_in_flight(bs); |
1421 | return ret; | |
a8823a3b KW |
1422 | } |
1423 | ||
fbb92b67 | 1424 | int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset, |
34460feb | 1425 | int64_t bytes, |
fbb92b67 KW |
1426 | QEMUIOVector *qiov, size_t qiov_offset, |
1427 | BdrvRequestFlags flags) | |
1428 | { | |
1429 | int ret; | |
37868b2a | 1430 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1431 | |
1432 | blk_inc_in_flight(blk); | |
70e8775e | 1433 | ret = blk_co_do_pwritev_part(blk, offset, bytes, qiov, qiov_offset, flags); |
fbb92b67 KW |
1434 | blk_dec_in_flight(blk); |
1435 | ||
1436 | return ret; | |
1437 | } | |
1438 | ||
6f675c93 AF |
1439 | int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes, |
1440 | const void *buf, BdrvRequestFlags flags) | |
1441 | { | |
1442 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1443 | IO_OR_GS_CODE(); | |
1444 | ||
1445 | assert(bytes <= SIZE_MAX); | |
1446 | ||
1447 | return blk_co_pwritev(blk, offset, bytes, &qiov, flags); | |
1448 | } | |
1449 | ||
b3016864 | 1450 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
34460feb | 1451 | int64_t bytes, QEMUIOVector *qiov, |
b3016864 VSO |
1452 | BdrvRequestFlags flags) |
1453 | { | |
37868b2a | 1454 | IO_OR_GS_CODE(); |
b3016864 VSO |
1455 | return blk_co_pwritev_part(blk, offset, bytes, qiov, 0, flags); |
1456 | } | |
1457 | ||
ff7e261b EGE |
1458 | int coroutine_fn blk_co_block_status_above(BlockBackend *blk, |
1459 | BlockDriverState *base, | |
1460 | int64_t offset, int64_t bytes, | |
1461 | int64_t *pnum, int64_t *map, | |
1462 | BlockDriverState **file) | |
1463 | { | |
1464 | IO_CODE(); | |
7ff9579e | 1465 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1466 | return bdrv_co_block_status_above(blk_bs(blk), base, offset, bytes, pnum, |
1467 | map, file); | |
1468 | } | |
1469 | ||
1470 | int coroutine_fn blk_co_is_allocated_above(BlockBackend *blk, | |
1471 | BlockDriverState *base, | |
1472 | bool include_base, int64_t offset, | |
1473 | int64_t bytes, int64_t *pnum) | |
1474 | { | |
1475 | IO_CODE(); | |
7ff9579e | 1476 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1477 | return bdrv_co_is_allocated_above(blk_bs(blk), base, include_base, offset, |
1478 | bytes, pnum); | |
1479 | } | |
1480 | ||
1bf1cbc9 KW |
1481 | typedef struct BlkRwCo { |
1482 | BlockBackend *blk; | |
1483 | int64_t offset; | |
c060332c | 1484 | void *iobuf; |
1bf1cbc9 KW |
1485 | int ret; |
1486 | BdrvRequestFlags flags; | |
1487 | } BlkRwCo; | |
1488 | ||
720ff280 KW |
1489 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1490 | { | |
0439c5a4 | 1491 | GLOBAL_STATE_CODE(); |
720ff280 KW |
1492 | return bdrv_make_zero(blk->root, flags); |
1493 | } | |
1494 | ||
c90e2a9c | 1495 | void blk_inc_in_flight(BlockBackend *blk) |
33f2a757 | 1496 | { |
37868b2a | 1497 | IO_CODE(); |
d73415a3 | 1498 | qatomic_inc(&blk->in_flight); |
33f2a757 SH |
1499 | } |
1500 | ||
c90e2a9c | 1501 | void blk_dec_in_flight(BlockBackend *blk) |
33f2a757 | 1502 | { |
37868b2a | 1503 | IO_CODE(); |
d73415a3 | 1504 | qatomic_dec(&blk->in_flight); |
cfe29d82 | 1505 | aio_wait_kick(); |
33f2a757 SH |
1506 | } |
1507 | ||
e7f7d676 HR |
1508 | static void error_callback_bh(void *opaque) |
1509 | { | |
1510 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1511 | |
33f2a757 | 1512 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1513 | acb->common.cb(acb->common.opaque, acb->ret); |
1514 | qemu_aio_unref(acb); | |
1515 | } | |
1516 | ||
ca78ecfa PL |
1517 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1518 | BlockCompletionFunc *cb, | |
1519 | void *opaque, int ret) | |
e7f7d676 HR |
1520 | { |
1521 | struct BlockBackendAIOCB *acb; | |
37868b2a | 1522 | IO_CODE(); |
e7f7d676 | 1523 | |
33f2a757 | 1524 | blk_inc_in_flight(blk); |
e7f7d676 | 1525 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1526 | acb->blk = blk; |
e7f7d676 HR |
1527 | acb->ret = ret; |
1528 | ||
e4ec5ad4 PD |
1529 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1530 | error_callback_bh, acb); | |
e7f7d676 HR |
1531 | return &acb->common; |
1532 | } | |
1533 | ||
57d6a428 KW |
1534 | typedef struct BlkAioEmAIOCB { |
1535 | BlockAIOCB common; | |
1536 | BlkRwCo rwco; | |
a93d81c8 | 1537 | int64_t bytes; |
57d6a428 | 1538 | bool has_returned; |
57d6a428 KW |
1539 | } BlkAioEmAIOCB; |
1540 | ||
1d719ddc SH |
1541 | static AioContext *blk_aio_em_aiocb_get_aio_context(BlockAIOCB *acb_) |
1542 | { | |
1543 | BlkAioEmAIOCB *acb = container_of(acb_, BlkAioEmAIOCB, common); | |
1544 | ||
1545 | return blk_get_aio_context(acb->rwco.blk); | |
1546 | } | |
1547 | ||
57d6a428 KW |
1548 | static const AIOCBInfo blk_aio_em_aiocb_info = { |
1549 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1d719ddc | 1550 | .get_aio_context = blk_aio_em_aiocb_get_aio_context, |
57d6a428 KW |
1551 | }; |
1552 | ||
1553 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1554 | { | |
57d6a428 KW |
1555 | if (acb->has_returned) { |
1556 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1557 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1558 | qemu_aio_unref(acb); |
1559 | } | |
1560 | } | |
1561 | ||
1562 | static void blk_aio_complete_bh(void *opaque) | |
1563 | { | |
fffb6e12 | 1564 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1565 | assert(acb->has_returned); |
1566 | blk_aio_complete(acb); | |
57d6a428 KW |
1567 | } |
1568 | ||
a93d81c8 VSO |
1569 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, |
1570 | int64_t bytes, | |
c060332c | 1571 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1572 | BdrvRequestFlags flags, |
1573 | BlockCompletionFunc *cb, void *opaque) | |
1574 | { | |
1575 | BlkAioEmAIOCB *acb; | |
1576 | Coroutine *co; | |
1577 | ||
33f2a757 | 1578 | blk_inc_in_flight(blk); |
57d6a428 KW |
1579 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1580 | acb->rwco = (BlkRwCo) { | |
1581 | .blk = blk, | |
1582 | .offset = offset, | |
c060332c | 1583 | .iobuf = iobuf, |
57d6a428 KW |
1584 | .flags = flags, |
1585 | .ret = NOT_DONE, | |
1586 | }; | |
7fa84cd8 | 1587 | acb->bytes = bytes; |
57d6a428 KW |
1588 | acb->has_returned = false; |
1589 | ||
0b8b8753 | 1590 | co = qemu_coroutine_create(co_entry, acb); |
3d65110f | 1591 | aio_co_enter(blk_get_aio_context(blk), co); |
57d6a428 KW |
1592 | |
1593 | acb->has_returned = true; | |
1594 | if (acb->rwco.ret != NOT_DONE) { | |
e4ec5ad4 PD |
1595 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1596 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1597 | } |
1598 | ||
1599 | return &acb->common; | |
1600 | } | |
1601 | ||
881a4c55 | 1602 | static void coroutine_fn blk_aio_read_entry(void *opaque) |
57d6a428 KW |
1603 | { |
1604 | BlkAioEmAIOCB *acb = opaque; | |
1605 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1606 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1607 | |
c060332c | 1608 | assert(qiov->size == acb->bytes); |
d1d3fc3d AF |
1609 | rwco->ret = blk_co_do_preadv_part(rwco->blk, rwco->offset, acb->bytes, qiov, |
1610 | 0, rwco->flags); | |
57d6a428 KW |
1611 | blk_aio_complete(acb); |
1612 | } | |
1613 | ||
881a4c55 | 1614 | static void coroutine_fn blk_aio_write_entry(void *opaque) |
57d6a428 KW |
1615 | { |
1616 | BlkAioEmAIOCB *acb = opaque; | |
1617 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1618 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1619 | |
c060332c | 1620 | assert(!qiov || qiov->size == acb->bytes); |
70e8775e VSO |
1621 | rwco->ret = blk_co_do_pwritev_part(rwco->blk, rwco->offset, acb->bytes, |
1622 | qiov, 0, rwco->flags); | |
57d6a428 KW |
1623 | blk_aio_complete(acb); |
1624 | } | |
1625 | ||
d004bd52 | 1626 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
a93d81c8 | 1627 | int64_t bytes, BdrvRequestFlags flags, |
d004bd52 | 1628 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1629 | { |
37868b2a | 1630 | IO_CODE(); |
a93d81c8 | 1631 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_write_entry, |
983a1600 | 1632 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); |
4be74634 MA |
1633 | } |
1634 | ||
c86422c5 | 1635 | int64_t coroutine_fn blk_co_getlength(BlockBackend *blk) |
4be74634 | 1636 | { |
37868b2a | 1637 | IO_CODE(); |
c73ff92c | 1638 | GRAPH_RDLOCK_GUARD(); |
c86422c5 | 1639 | |
c73ff92c | 1640 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1641 | return -ENOMEDIUM; |
1642 | } | |
1643 | ||
c86422c5 | 1644 | return bdrv_co_getlength(blk_bs(blk)); |
4be74634 MA |
1645 | } |
1646 | ||
9ed98cae | 1647 | int64_t coroutine_fn blk_co_nb_sectors(BlockBackend *blk) |
4be74634 | 1648 | { |
e5203a3b PB |
1649 | BlockDriverState *bs = blk_bs(blk); |
1650 | ||
37868b2a | 1651 | IO_CODE(); |
d8fbf9aa KW |
1652 | GRAPH_RDLOCK_GUARD(); |
1653 | ||
e5203a3b | 1654 | if (!bs) { |
9ed98cae | 1655 | return -ENOMEDIUM; |
a46fc9c9 | 1656 | } else { |
9ed98cae | 1657 | return bdrv_co_nb_sectors(bs); |
a46fc9c9 | 1658 | } |
4be74634 MA |
1659 | } |
1660 | ||
81f730d4 PB |
1661 | /* |
1662 | * This wrapper is written by hand because this function is in the hot I/O path, | |
1663 | * via blk_get_geometry. | |
1664 | */ | |
1665 | int64_t coroutine_mixed_fn blk_nb_sectors(BlockBackend *blk) | |
1666 | { | |
1667 | BlockDriverState *bs = blk_bs(blk); | |
1668 | ||
1669 | IO_CODE(); | |
1670 | ||
1671 | if (!bs) { | |
1672 | return -ENOMEDIUM; | |
1673 | } else { | |
1674 | return bdrv_nb_sectors(bs); | |
1675 | } | |
1676 | } | |
1677 | ||
9ed98cae PB |
1678 | /* return 0 as number of sectors if no device present or error */ |
1679 | void coroutine_fn blk_co_get_geometry(BlockBackend *blk, | |
1680 | uint64_t *nb_sectors_ptr) | |
1ef01253 | 1681 | { |
9ed98cae PB |
1682 | int64_t ret = blk_co_nb_sectors(blk); |
1683 | *nb_sectors_ptr = ret < 0 ? 0 : ret; | |
1ef01253 HR |
1684 | } |
1685 | ||
81f730d4 PB |
1686 | /* |
1687 | * This wrapper is written by hand because this function is in the hot I/O path. | |
1688 | */ | |
1689 | void coroutine_mixed_fn blk_get_geometry(BlockBackend *blk, | |
1690 | uint64_t *nb_sectors_ptr) | |
1691 | { | |
1692 | int64_t ret = blk_nb_sectors(blk); | |
1693 | *nb_sectors_ptr = ret < 0 ? 0 : ret; | |
1694 | } | |
1695 | ||
60cb2fa7 EB |
1696 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1697 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1698 | BlockCompletionFunc *cb, void *opaque) | |
1699 | { | |
37868b2a | 1700 | IO_CODE(); |
a93d81c8 | 1701 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1702 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1703 | blk_aio_read_entry, flags, cb, opaque); | |
1704 | } | |
1705 | ||
60cb2fa7 EB |
1706 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1707 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1708 | BlockCompletionFunc *cb, void *opaque) | |
1709 | { | |
37868b2a | 1710 | IO_CODE(); |
73d4a113 | 1711 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1712 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1713 | blk_aio_write_entry, flags, cb, opaque); | |
1714 | } | |
1715 | ||
4be74634 MA |
1716 | void blk_aio_cancel(BlockAIOCB *acb) |
1717 | { | |
0439c5a4 | 1718 | GLOBAL_STATE_CODE(); |
4be74634 MA |
1719 | bdrv_aio_cancel(acb); |
1720 | } | |
1721 | ||
1722 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1723 | { | |
37868b2a | 1724 | IO_CODE(); |
4be74634 MA |
1725 | bdrv_aio_cancel_async(acb); |
1726 | } | |
1727 | ||
fbb92b67 | 1728 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
df02da00 | 1729 | static int coroutine_fn |
70e8775e | 1730 | blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1731 | { |
1581a70d EGE |
1732 | IO_CODE(); |
1733 | ||
cf312932 | 1734 | blk_wait_while_drained(blk); |
26c518ab | 1735 | GRAPH_RDLOCK_GUARD(); |
cf312932 | 1736 | |
c73ff92c | 1737 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1738 | return -ENOMEDIUM; |
1739 | } | |
1740 | ||
48af776a KW |
1741 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1742 | } | |
1743 | ||
df02da00 AF |
1744 | int coroutine_fn blk_co_ioctl(BlockBackend *blk, unsigned long int req, |
1745 | void *buf) | |
48af776a | 1746 | { |
16d36e29 | 1747 | int ret; |
37868b2a | 1748 | IO_OR_GS_CODE(); |
c060332c | 1749 | |
16d36e29 | 1750 | blk_inc_in_flight(blk); |
df02da00 | 1751 | ret = blk_co_do_ioctl(blk, req, buf); |
16d36e29 | 1752 | blk_dec_in_flight(blk); |
48af776a | 1753 | |
16d36e29 | 1754 | return ret; |
48af776a KW |
1755 | } |
1756 | ||
881a4c55 | 1757 | static void coroutine_fn blk_aio_ioctl_entry(void *opaque) |
48af776a KW |
1758 | { |
1759 | BlkAioEmAIOCB *acb = opaque; | |
1760 | BlkRwCo *rwco = &acb->rwco; | |
1761 | ||
70e8775e | 1762 | rwco->ret = blk_co_do_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
c060332c | 1763 | |
48af776a | 1764 | blk_aio_complete(acb); |
4be74634 MA |
1765 | } |
1766 | ||
1767 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1768 | BlockCompletionFunc *cb, void *opaque) | |
1769 | { | |
37868b2a | 1770 | IO_CODE(); |
c060332c | 1771 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1772 | } |
1773 | ||
fbb92b67 | 1774 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1775 | static int coroutine_fn |
70e8775e | 1776 | blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes) |
2bb0dce7 | 1777 | { |
cf312932 | 1778 | int ret; |
1581a70d | 1779 | IO_CODE(); |
cf312932 KW |
1780 | |
1781 | blk_wait_while_drained(blk); | |
9a5a1c62 | 1782 | GRAPH_RDLOCK_GUARD(); |
cf312932 KW |
1783 | |
1784 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1785 | if (ret < 0) { |
1786 | return ret; | |
1787 | } | |
1788 | ||
0b9fd3f4 | 1789 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1790 | } |
1791 | ||
881a4c55 | 1792 | static void coroutine_fn blk_aio_pdiscard_entry(void *opaque) |
564806c5 KW |
1793 | { |
1794 | BlkAioEmAIOCB *acb = opaque; | |
1795 | BlkRwCo *rwco = &acb->rwco; | |
1796 | ||
70e8775e | 1797 | rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes); |
564806c5 KW |
1798 | blk_aio_complete(acb); |
1799 | } | |
1800 | ||
1801 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, | |
a93d81c8 | 1802 | int64_t offset, int64_t bytes, |
564806c5 KW |
1803 | BlockCompletionFunc *cb, void *opaque) |
1804 | { | |
37868b2a | 1805 | IO_CODE(); |
564806c5 KW |
1806 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
1807 | cb, opaque); | |
1808 | } | |
1809 | ||
2800637a VSO |
1810 | int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset, |
1811 | int64_t bytes) | |
fbb92b67 KW |
1812 | { |
1813 | int ret; | |
37868b2a | 1814 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1815 | |
1816 | blk_inc_in_flight(blk); | |
70e8775e | 1817 | ret = blk_co_do_pdiscard(blk, offset, bytes); |
fbb92b67 KW |
1818 | blk_dec_in_flight(blk); |
1819 | ||
1820 | return ret; | |
1821 | } | |
1822 | ||
fbb92b67 | 1823 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1824 | static int coroutine_fn blk_co_do_flush(BlockBackend *blk) |
2bb0dce7 | 1825 | { |
1581a70d | 1826 | IO_CODE(); |
88095349 EGE |
1827 | blk_wait_while_drained(blk); |
1828 | GRAPH_RDLOCK_GUARD(); | |
cf312932 | 1829 | |
c73ff92c | 1830 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1831 | return -ENOMEDIUM; |
1832 | } | |
1833 | ||
f21d96d0 | 1834 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1835 | } |
1836 | ||
881a4c55 | 1837 | static void coroutine_fn blk_aio_flush_entry(void *opaque) |
564806c5 KW |
1838 | { |
1839 | BlkAioEmAIOCB *acb = opaque; | |
1840 | BlkRwCo *rwco = &acb->rwco; | |
1841 | ||
70e8775e | 1842 | rwco->ret = blk_co_do_flush(rwco->blk); |
564806c5 KW |
1843 | blk_aio_complete(acb); |
1844 | } | |
1845 | ||
1846 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
1847 | BlockCompletionFunc *cb, void *opaque) | |
1848 | { | |
37868b2a | 1849 | IO_CODE(); |
564806c5 KW |
1850 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
1851 | } | |
1852 | ||
fbb92b67 KW |
1853 | int coroutine_fn blk_co_flush(BlockBackend *blk) |
1854 | { | |
1855 | int ret; | |
37868b2a | 1856 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1857 | |
1858 | blk_inc_in_flight(blk); | |
70e8775e | 1859 | ret = blk_co_do_flush(blk); |
fbb92b67 KW |
1860 | blk_dec_in_flight(blk); |
1861 | ||
1862 | return ret; | |
1863 | } | |
1864 | ||
6d43eaa3 SL |
1865 | static void coroutine_fn blk_aio_zone_report_entry(void *opaque) |
1866 | { | |
1867 | BlkAioEmAIOCB *acb = opaque; | |
1868 | BlkRwCo *rwco = &acb->rwco; | |
1869 | ||
1870 | rwco->ret = blk_co_zone_report(rwco->blk, rwco->offset, | |
1871 | (unsigned int*)(uintptr_t)acb->bytes, | |
1872 | rwco->iobuf); | |
1873 | blk_aio_complete(acb); | |
1874 | } | |
1875 | ||
1876 | BlockAIOCB *blk_aio_zone_report(BlockBackend *blk, int64_t offset, | |
1877 | unsigned int *nr_zones, | |
1878 | BlockZoneDescriptor *zones, | |
1879 | BlockCompletionFunc *cb, void *opaque) | |
1880 | { | |
1881 | BlkAioEmAIOCB *acb; | |
1882 | Coroutine *co; | |
1883 | IO_CODE(); | |
1884 | ||
1885 | blk_inc_in_flight(blk); | |
1886 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1887 | acb->rwco = (BlkRwCo) { | |
1888 | .blk = blk, | |
1889 | .offset = offset, | |
1890 | .iobuf = zones, | |
1891 | .ret = NOT_DONE, | |
1892 | }; | |
1893 | acb->bytes = (int64_t)(uintptr_t)nr_zones, | |
1894 | acb->has_returned = false; | |
1895 | ||
1896 | co = qemu_coroutine_create(blk_aio_zone_report_entry, acb); | |
1897 | aio_co_enter(blk_get_aio_context(blk), co); | |
1898 | ||
1899 | acb->has_returned = true; | |
1900 | if (acb->rwco.ret != NOT_DONE) { | |
1901 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), | |
1902 | blk_aio_complete_bh, acb); | |
1903 | } | |
1904 | ||
1905 | return &acb->common; | |
1906 | } | |
1907 | ||
1908 | static void coroutine_fn blk_aio_zone_mgmt_entry(void *opaque) | |
1909 | { | |
1910 | BlkAioEmAIOCB *acb = opaque; | |
1911 | BlkRwCo *rwco = &acb->rwco; | |
1912 | ||
1913 | rwco->ret = blk_co_zone_mgmt(rwco->blk, | |
1914 | (BlockZoneOp)(uintptr_t)rwco->iobuf, | |
1915 | rwco->offset, acb->bytes); | |
1916 | blk_aio_complete(acb); | |
1917 | } | |
1918 | ||
1919 | BlockAIOCB *blk_aio_zone_mgmt(BlockBackend *blk, BlockZoneOp op, | |
1920 | int64_t offset, int64_t len, | |
1921 | BlockCompletionFunc *cb, void *opaque) { | |
1922 | BlkAioEmAIOCB *acb; | |
1923 | Coroutine *co; | |
1924 | IO_CODE(); | |
1925 | ||
1926 | blk_inc_in_flight(blk); | |
1927 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1928 | acb->rwco = (BlkRwCo) { | |
1929 | .blk = blk, | |
1930 | .offset = offset, | |
1931 | .iobuf = (void *)(uintptr_t)op, | |
1932 | .ret = NOT_DONE, | |
1933 | }; | |
1934 | acb->bytes = len; | |
1935 | acb->has_returned = false; | |
1936 | ||
1937 | co = qemu_coroutine_create(blk_aio_zone_mgmt_entry, acb); | |
1938 | aio_co_enter(blk_get_aio_context(blk), co); | |
1939 | ||
1940 | acb->has_returned = true; | |
1941 | if (acb->rwco.ret != NOT_DONE) { | |
1942 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), | |
1943 | blk_aio_complete_bh, acb); | |
1944 | } | |
1945 | ||
1946 | return &acb->common; | |
1947 | } | |
1948 | ||
4751d09a SL |
1949 | static void coroutine_fn blk_aio_zone_append_entry(void *opaque) |
1950 | { | |
1951 | BlkAioEmAIOCB *acb = opaque; | |
1952 | BlkRwCo *rwco = &acb->rwco; | |
1953 | ||
1954 | rwco->ret = blk_co_zone_append(rwco->blk, (int64_t *)(uintptr_t)acb->bytes, | |
1955 | rwco->iobuf, rwco->flags); | |
1956 | blk_aio_complete(acb); | |
1957 | } | |
1958 | ||
1959 | BlockAIOCB *blk_aio_zone_append(BlockBackend *blk, int64_t *offset, | |
1960 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1961 | BlockCompletionFunc *cb, void *opaque) { | |
1962 | BlkAioEmAIOCB *acb; | |
1963 | Coroutine *co; | |
1964 | IO_CODE(); | |
1965 | ||
1966 | blk_inc_in_flight(blk); | |
1967 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1968 | acb->rwco = (BlkRwCo) { | |
1969 | .blk = blk, | |
1970 | .ret = NOT_DONE, | |
1971 | .flags = flags, | |
1972 | .iobuf = qiov, | |
1973 | }; | |
1974 | acb->bytes = (int64_t)(uintptr_t)offset; | |
1975 | acb->has_returned = false; | |
1976 | ||
1977 | co = qemu_coroutine_create(blk_aio_zone_append_entry, acb); | |
1978 | aio_co_enter(blk_get_aio_context(blk), co); | |
1979 | acb->has_returned = true; | |
1980 | if (acb->rwco.ret != NOT_DONE) { | |
1981 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), | |
1982 | blk_aio_complete_bh, acb); | |
1983 | } | |
1984 | ||
1985 | return &acb->common; | |
1986 | } | |
1987 | ||
6d43eaa3 SL |
1988 | /* |
1989 | * Send a zone_report command. | |
1990 | * offset is a byte offset from the start of the device. No alignment | |
1991 | * required for offset. | |
1992 | * nr_zones represents IN maximum and OUT actual. | |
1993 | */ | |
1994 | int coroutine_fn blk_co_zone_report(BlockBackend *blk, int64_t offset, | |
1995 | unsigned int *nr_zones, | |
1996 | BlockZoneDescriptor *zones) | |
1997 | { | |
1998 | int ret; | |
1999 | IO_CODE(); | |
2000 | ||
2001 | blk_inc_in_flight(blk); /* increase before waiting */ | |
2002 | blk_wait_while_drained(blk); | |
2003 | GRAPH_RDLOCK_GUARD(); | |
2004 | if (!blk_is_available(blk)) { | |
2005 | blk_dec_in_flight(blk); | |
2006 | return -ENOMEDIUM; | |
2007 | } | |
2008 | ret = bdrv_co_zone_report(blk_bs(blk), offset, nr_zones, zones); | |
2009 | blk_dec_in_flight(blk); | |
2010 | return ret; | |
2011 | } | |
2012 | ||
2013 | /* | |
2014 | * Send a zone_management command. | |
2015 | * op is the zone operation; | |
2016 | * offset is the byte offset from the start of the zoned device; | |
2017 | * len is the maximum number of bytes the command should operate on. It | |
2018 | * should be aligned with the device zone size. | |
2019 | */ | |
2020 | int coroutine_fn blk_co_zone_mgmt(BlockBackend *blk, BlockZoneOp op, | |
2021 | int64_t offset, int64_t len) | |
2022 | { | |
2023 | int ret; | |
2024 | IO_CODE(); | |
2025 | ||
2026 | blk_inc_in_flight(blk); | |
2027 | blk_wait_while_drained(blk); | |
2028 | GRAPH_RDLOCK_GUARD(); | |
2029 | ||
2030 | ret = blk_check_byte_request(blk, offset, len); | |
2031 | if (ret < 0) { | |
2032 | blk_dec_in_flight(blk); | |
2033 | return ret; | |
2034 | } | |
2035 | ||
2036 | ret = bdrv_co_zone_mgmt(blk_bs(blk), op, offset, len); | |
2037 | blk_dec_in_flight(blk); | |
2038 | return ret; | |
2039 | } | |
2040 | ||
4751d09a SL |
2041 | /* |
2042 | * Send a zone_append command. | |
2043 | */ | |
2044 | int coroutine_fn blk_co_zone_append(BlockBackend *blk, int64_t *offset, | |
2045 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
2046 | { | |
2047 | int ret; | |
2048 | IO_CODE(); | |
2049 | ||
2050 | blk_inc_in_flight(blk); | |
2051 | blk_wait_while_drained(blk); | |
2052 | GRAPH_RDLOCK_GUARD(); | |
2053 | if (!blk_is_available(blk)) { | |
2054 | blk_dec_in_flight(blk); | |
2055 | return -ENOMEDIUM; | |
2056 | } | |
2057 | ||
2058 | ret = bdrv_co_zone_append(blk_bs(blk), offset, qiov, flags); | |
2059 | blk_dec_in_flight(blk); | |
2060 | return ret; | |
2061 | } | |
2062 | ||
97b0385a AY |
2063 | void blk_drain(BlockBackend *blk) |
2064 | { | |
33f2a757 | 2065 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2066 | GLOBAL_STATE_CODE(); |
33f2a757 SH |
2067 | |
2068 | if (bs) { | |
1e3552db | 2069 | bdrv_ref(bs); |
33f2a757 SH |
2070 | bdrv_drained_begin(bs); |
2071 | } | |
2072 | ||
2073 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 2074 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
6a8a98a0 | 2075 | qatomic_read(&blk->in_flight) > 0); |
33f2a757 SH |
2076 | |
2077 | if (bs) { | |
2078 | bdrv_drained_end(bs); | |
1e3552db | 2079 | bdrv_unref(bs); |
a46fc9c9 | 2080 | } |
97b0385a AY |
2081 | } |
2082 | ||
4be74634 MA |
2083 | void blk_drain_all(void) |
2084 | { | |
33f2a757 SH |
2085 | BlockBackend *blk = NULL; |
2086 | ||
0439c5a4 EGE |
2087 | GLOBAL_STATE_CODE(); |
2088 | ||
33f2a757 SH |
2089 | bdrv_drain_all_begin(); |
2090 | ||
2091 | while ((blk = blk_all_next(blk)) != NULL) { | |
33f2a757 | 2092 | /* We may have -ENOMEDIUM completions in flight */ |
d5eab432 | 2093 | AIO_WAIT_WHILE_UNLOCKED(NULL, qatomic_read(&blk->in_flight) > 0); |
33f2a757 SH |
2094 | } |
2095 | ||
2096 | bdrv_drain_all_end(); | |
4be74634 MA |
2097 | } |
2098 | ||
373340b2 HR |
2099 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
2100 | BlockdevOnError on_write_error) | |
2101 | { | |
0439c5a4 | 2102 | GLOBAL_STATE_CODE(); |
373340b2 HR |
2103 | blk->on_read_error = on_read_error; |
2104 | blk->on_write_error = on_write_error; | |
2105 | } | |
2106 | ||
4be74634 MA |
2107 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
2108 | { | |
37868b2a | 2109 | IO_CODE(); |
373340b2 | 2110 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
2111 | } |
2112 | ||
2113 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
2114 | int error) | |
2115 | { | |
373340b2 | 2116 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
37868b2a | 2117 | IO_CODE(); |
373340b2 HR |
2118 | |
2119 | switch (on_err) { | |
2120 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2121 | return (error == ENOSPC) ? | |
2122 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
2123 | case BLOCKDEV_ON_ERROR_STOP: | |
2124 | return BLOCK_ERROR_ACTION_STOP; | |
2125 | case BLOCKDEV_ON_ERROR_REPORT: | |
2126 | return BLOCK_ERROR_ACTION_REPORT; | |
2127 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2128 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 2129 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
2130 | default: |
2131 | abort(); | |
2132 | } | |
4be74634 MA |
2133 | } |
2134 | ||
373340b2 HR |
2135 | static void send_qmp_error_event(BlockBackend *blk, |
2136 | BlockErrorAction action, | |
2137 | bool is_read, int error) | |
2138 | { | |
2139 | IoOperationType optype; | |
bfe1a14c | 2140 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
2141 | |
2142 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
54fde4ff | 2143 | qapi_event_send_block_io_error(blk_name(blk), |
bfe1a14c | 2144 | bs ? bdrv_get_node_name(bs) : NULL, optype, |
2bf7e10f | 2145 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 2146 | error == ENOSPC, strerror(error)); |
373340b2 HR |
2147 | } |
2148 | ||
2149 | /* This is done by device models because, while the block layer knows | |
2150 | * about the error, it does not know whether an operation comes from | |
2151 | * the device or the block layer (from a job, for example). | |
2152 | */ | |
4be74634 MA |
2153 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
2154 | bool is_read, int error) | |
2155 | { | |
373340b2 | 2156 | assert(error >= 0); |
37868b2a | 2157 | IO_CODE(); |
373340b2 HR |
2158 | |
2159 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
2160 | /* First set the iostatus, so that "info block" returns an iostatus | |
2161 | * that matches the events raised so far (an additional error iostatus | |
2162 | * is fine, but not a lost one). | |
2163 | */ | |
2164 | blk_iostatus_set_err(blk, error); | |
2165 | ||
2166 | /* Then raise the request to stop the VM and the event. | |
2167 | * qemu_system_vmstop_request_prepare has two effects. First, | |
2168 | * it ensures that the STOP event always comes after the | |
2169 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
2170 | * can observe the STOP event and do a "cont" before the STOP | |
2171 | * event is issued, the VM will not stop. In this case, vm_start() | |
2172 | * also ensures that the STOP/RESUME pair of events is emitted. | |
2173 | */ | |
2174 | qemu_system_vmstop_request_prepare(); | |
2175 | send_qmp_error_event(blk, action, is_read, error); | |
2176 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
2177 | } else { | |
2178 | send_qmp_error_event(blk, action, is_read, error); | |
2179 | } | |
4be74634 MA |
2180 | } |
2181 | ||
86b1cf32 KW |
2182 | /* |
2183 | * Returns true if the BlockBackend can support taking write permissions | |
2184 | * (because its root node is not read-only). | |
2185 | */ | |
2186 | bool blk_supports_write_perm(BlockBackend *blk) | |
4be74634 | 2187 | { |
f21d96d0 | 2188 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2189 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2190 | |
2191 | if (bs) { | |
86b1cf32 | 2192 | return !bdrv_is_read_only(bs); |
061959e8 | 2193 | } else { |
260242a8 | 2194 | return blk->root_state.open_flags & BDRV_O_RDWR; |
061959e8 | 2195 | } |
4be74634 MA |
2196 | } |
2197 | ||
86b1cf32 KW |
2198 | /* |
2199 | * Returns true if the BlockBackend can be written to in its current | |
2200 | * configuration (i.e. if write permission have been requested) | |
2201 | */ | |
2202 | bool blk_is_writable(BlockBackend *blk) | |
2203 | { | |
37868b2a | 2204 | IO_CODE(); |
86b1cf32 KW |
2205 | return blk->perm & BLK_PERM_WRITE; |
2206 | } | |
2207 | ||
96710565 | 2208 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 2209 | { |
f21d96d0 | 2210 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2211 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2212 | |
2213 | if (!bs) { | |
96710565 | 2214 | return false; |
a46fc9c9 HR |
2215 | } |
2216 | ||
f21d96d0 | 2217 | return bdrv_is_sg(bs); |
4be74634 MA |
2218 | } |
2219 | ||
96710565 | 2220 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 2221 | { |
37868b2a | 2222 | IO_CODE(); |
bfd18d1e | 2223 | return blk->enable_write_cache; |
4be74634 MA |
2224 | } |
2225 | ||
2226 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
2227 | { | |
be8da05b | 2228 | IO_CODE(); |
bfd18d1e | 2229 | blk->enable_write_cache = wce; |
4be74634 MA |
2230 | } |
2231 | ||
3b717194 | 2232 | void blk_activate(BlockBackend *blk, Error **errp) |
2bb0dce7 | 2233 | { |
f21d96d0 | 2234 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2235 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2236 | |
2237 | if (!bs) { | |
c09ba36c HR |
2238 | error_setg(errp, "Device '%s' has no medium", blk->name); |
2239 | return; | |
2240 | } | |
2241 | ||
da4afaff KW |
2242 | /* |
2243 | * Migration code can call this function in coroutine context, so leave | |
2244 | * coroutine context if necessary. | |
2245 | */ | |
2246 | if (qemu_in_coroutine()) { | |
2247 | bdrv_co_activate(bs, errp); | |
2248 | } else { | |
2249 | bdrv_activate(bs, errp); | |
2250 | } | |
2bb0dce7 HR |
2251 | } |
2252 | ||
1e97be91 | 2253 | bool coroutine_fn blk_co_is_inserted(BlockBackend *blk) |
4be74634 | 2254 | { |
f21d96d0 | 2255 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2256 | IO_CODE(); |
c73ff92c | 2257 | assert_bdrv_graph_readable(); |
f21d96d0 | 2258 | |
1e97be91 | 2259 | return bs && bdrv_co_is_inserted(bs); |
db0284f8 HR |
2260 | } |
2261 | ||
c73ff92c | 2262 | bool coroutine_fn blk_co_is_available(BlockBackend *blk) |
db0284f8 | 2263 | { |
37868b2a | 2264 | IO_CODE(); |
c73ff92c | 2265 | return blk_co_is_inserted(blk) && !blk_dev_is_tray_open(blk); |
4be74634 MA |
2266 | } |
2267 | ||
2c75261c | 2268 | void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked) |
4be74634 | 2269 | { |
f21d96d0 | 2270 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2271 | IO_CODE(); |
79a292e5 | 2272 | GRAPH_RDLOCK_GUARD(); |
f21d96d0 KW |
2273 | |
2274 | if (bs) { | |
2c75261c | 2275 | bdrv_co_lock_medium(bs, locked); |
a46fc9c9 | 2276 | } |
4be74634 MA |
2277 | } |
2278 | ||
2531b390 | 2279 | void coroutine_fn blk_co_eject(BlockBackend *blk, bool eject_flag) |
4be74634 | 2280 | { |
f21d96d0 | 2281 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 | 2282 | char *id; |
37868b2a | 2283 | IO_CODE(); |
79a292e5 | 2284 | GRAPH_RDLOCK_GUARD(); |
2d76e724 | 2285 | |
f21d96d0 | 2286 | if (bs) { |
2531b390 | 2287 | bdrv_co_eject(bs, eject_flag); |
a46fc9c9 | 2288 | } |
c47ee043 JS |
2289 | |
2290 | /* Whether or not we ejected on the backend, | |
2291 | * the frontend experienced a tray event. */ | |
2292 | id = blk_get_attached_dev_id(blk); | |
2293 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 2294 | eject_flag); |
c47ee043 | 2295 | g_free(id); |
4be74634 MA |
2296 | } |
2297 | ||
2298 | int blk_get_flags(BlockBackend *blk) | |
2299 | { | |
f21d96d0 | 2300 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2301 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2302 | |
2303 | if (bs) { | |
2304 | return bdrv_get_flags(bs); | |
061959e8 HR |
2305 | } else { |
2306 | return blk->root_state.open_flags; | |
2307 | } | |
4be74634 MA |
2308 | } |
2309 | ||
4841211e EB |
2310 | /* Returns the minimum request alignment, in bytes; guaranteed nonzero */ |
2311 | uint32_t blk_get_request_alignment(BlockBackend *blk) | |
2312 | { | |
2313 | BlockDriverState *bs = blk_bs(blk); | |
37868b2a | 2314 | IO_CODE(); |
4841211e EB |
2315 | return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE; |
2316 | } | |
2317 | ||
24b36e98 PB |
2318 | /* Returns the maximum hardware transfer length, in bytes; guaranteed nonzero */ |
2319 | uint64_t blk_get_max_hw_transfer(BlockBackend *blk) | |
2320 | { | |
2321 | BlockDriverState *bs = blk_bs(blk); | |
2322 | uint64_t max = INT_MAX; | |
37868b2a | 2323 | IO_CODE(); |
24b36e98 PB |
2324 | |
2325 | if (bs) { | |
2326 | max = MIN_NON_ZERO(max, bs->bl.max_hw_transfer); | |
2327 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); | |
2328 | } | |
2329 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); | |
2330 | } | |
2331 | ||
5def6b80 EB |
2332 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
2333 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 2334 | { |
f21d96d0 | 2335 | BlockDriverState *bs = blk_bs(blk); |
b99f7fa0 | 2336 | uint32_t max = INT_MAX; |
37868b2a | 2337 | IO_CODE(); |
f21d96d0 KW |
2338 | |
2339 | if (bs) { | |
b99f7fa0 | 2340 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); |
a46fc9c9 | 2341 | } |
b99f7fa0 | 2342 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); |
454057b7 PL |
2343 | } |
2344 | ||
cc071629 PB |
2345 | int blk_get_max_hw_iov(BlockBackend *blk) |
2346 | { | |
37868b2a | 2347 | IO_CODE(); |
cc071629 PB |
2348 | return MIN_NON_ZERO(blk->root->bs->bl.max_hw_iov, |
2349 | blk->root->bs->bl.max_iov); | |
2350 | } | |
2351 | ||
648296e0 SH |
2352 | int blk_get_max_iov(BlockBackend *blk) |
2353 | { | |
37868b2a | 2354 | IO_CODE(); |
f21d96d0 | 2355 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
2356 | } |
2357 | ||
f1c17521 PB |
2358 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
2359 | { | |
37868b2a | 2360 | IO_CODE(); |
f21d96d0 | 2361 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
2362 | } |
2363 | ||
4be74634 MA |
2364 | void *blk_blockalign(BlockBackend *blk, size_t size) |
2365 | { | |
37868b2a | 2366 | IO_CODE(); |
f21d96d0 | 2367 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
2368 | } |
2369 | ||
2370 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
2371 | { | |
f21d96d0 | 2372 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2373 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2374 | |
2375 | if (!bs) { | |
a46fc9c9 HR |
2376 | return false; |
2377 | } | |
2378 | ||
f21d96d0 | 2379 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
2380 | } |
2381 | ||
2382 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
2383 | { | |
f21d96d0 | 2384 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2385 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2386 | |
2387 | if (bs) { | |
2388 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 2389 | } |
4be74634 MA |
2390 | } |
2391 | ||
2392 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
2393 | { | |
f21d96d0 | 2394 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2395 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2396 | |
2397 | if (bs) { | |
2398 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 2399 | } |
4be74634 MA |
2400 | } |
2401 | ||
2402 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
2403 | { | |
f21d96d0 | 2404 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2405 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2406 | |
2407 | if (bs) { | |
2408 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 2409 | } |
4be74634 MA |
2410 | } |
2411 | ||
2412 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
2413 | { | |
dea97c1f | 2414 | BlockDriverState *bs; |
37868b2a | 2415 | IO_CODE(); |
d861ab3a | 2416 | |
dea97c1f KW |
2417 | if (!blk) { |
2418 | return qemu_get_aio_context(); | |
2419 | } | |
2420 | ||
2421 | bs = blk_bs(blk); | |
d861ab3a | 2422 | if (bs) { |
132ada80 KW |
2423 | AioContext *ctx = bdrv_get_aio_context(blk_bs(blk)); |
2424 | assert(ctx == blk->ctx); | |
d861ab3a KW |
2425 | } |
2426 | ||
2427 | return blk->ctx; | |
4981bdec HR |
2428 | } |
2429 | ||
2430 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
2431 | { | |
2432 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
2433 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
2434 | } |
2435 | ||
97896a48 KW |
2436 | static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2437 | bool update_root_node, Error **errp) | |
4be74634 | 2438 | { |
f21d96d0 | 2439 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 2440 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
97896a48 | 2441 | int ret; |
f21d96d0 KW |
2442 | |
2443 | if (bs) { | |
1e3552db SH |
2444 | bdrv_ref(bs); |
2445 | ||
97896a48 | 2446 | if (update_root_node) { |
f8be48ad EGE |
2447 | /* |
2448 | * update_root_node MUST be false for blk_root_set_aio_ctx_commit(), | |
2449 | * as we are already in the commit function of a transaction. | |
2450 | */ | |
a41cfda1 | 2451 | ret = bdrv_try_change_aio_context(bs, new_context, blk->root, errp); |
97896a48 | 2452 | if (ret < 0) { |
1e3552db | 2453 | bdrv_unref(bs); |
97896a48 KW |
2454 | return ret; |
2455 | } | |
2456 | } | |
af5b6ebe HR |
2457 | /* |
2458 | * Make blk->ctx consistent with the root node before we invoke any | |
2459 | * other operations like drain that might inquire blk->ctx | |
2460 | */ | |
2461 | blk->ctx = new_context; | |
c61791fc | 2462 | if (tgm->throttle_state) { |
dc868fb0 | 2463 | bdrv_drained_begin(bs); |
c61791fc MP |
2464 | throttle_group_detach_aio_context(tgm); |
2465 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 2466 | bdrv_drained_end(bs); |
7ca7f0f6 | 2467 | } |
1e3552db SH |
2468 | |
2469 | bdrv_unref(bs); | |
af5b6ebe HR |
2470 | } else { |
2471 | blk->ctx = new_context; | |
a46fc9c9 | 2472 | } |
97896a48 KW |
2473 | |
2474 | return 0; | |
4be74634 MA |
2475 | } |
2476 | ||
97896a48 KW |
2477 | int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2478 | Error **errp) | |
38475269 | 2479 | { |
0439c5a4 | 2480 | GLOBAL_STATE_CODE(); |
97896a48 | 2481 | return blk_do_set_aio_context(blk, new_context, true, errp); |
38475269 KW |
2482 | } |
2483 | ||
33949396 EGE |
2484 | typedef struct BdrvStateBlkRootContext { |
2485 | AioContext *new_ctx; | |
2486 | BlockBackend *blk; | |
2487 | } BdrvStateBlkRootContext; | |
2488 | ||
2489 | static void blk_root_set_aio_ctx_commit(void *opaque) | |
2490 | { | |
2491 | BdrvStateBlkRootContext *s = opaque; | |
2492 | BlockBackend *blk = s->blk; | |
2493 | ||
2494 | blk_do_set_aio_context(blk, s->new_ctx, false, &error_abort); | |
2495 | } | |
2496 | ||
2497 | static TransactionActionDrv set_blk_root_context = { | |
2498 | .commit = blk_root_set_aio_ctx_commit, | |
2499 | .clean = g_free, | |
2500 | }; | |
2501 | ||
2502 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, | |
2503 | GHashTable *visited, Transaction *tran, | |
2504 | Error **errp) | |
38475269 KW |
2505 | { |
2506 | BlockBackend *blk = child->opaque; | |
33949396 | 2507 | BdrvStateBlkRootContext *s; |
38475269 | 2508 | |
33949396 EGE |
2509 | if (!blk->allow_aio_context_change) { |
2510 | /* | |
2511 | * Manually created BlockBackends (those with a name) that are not | |
2512 | * attached to anything can change their AioContext without updating | |
2513 | * their user; return an error for others. | |
2514 | */ | |
2515 | if (!blk->name || blk->dev) { | |
2516 | /* TODO Add BB name/QOM path */ | |
2517 | error_setg(errp, "Cannot change iothread of active block backend"); | |
2518 | return false; | |
2519 | } | |
980b0f94 KW |
2520 | } |
2521 | ||
33949396 EGE |
2522 | s = g_new(BdrvStateBlkRootContext, 1); |
2523 | *s = (BdrvStateBlkRootContext) { | |
2524 | .new_ctx = ctx, | |
2525 | .blk = blk, | |
2526 | }; | |
38475269 | 2527 | |
33949396 | 2528 | tran_add(tran, &set_blk_root_context, s); |
38475269 KW |
2529 | return true; |
2530 | } | |
2531 | ||
2019ba0a HR |
2532 | void blk_add_aio_context_notifier(BlockBackend *blk, |
2533 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
2534 | void (*detach_aio_context)(void *opaque), void *opaque) | |
2535 | { | |
d03654ea | 2536 | BlockBackendAioNotifier *notifier; |
f21d96d0 | 2537 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2538 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2539 | |
d03654ea SH |
2540 | notifier = g_new(BlockBackendAioNotifier, 1); |
2541 | notifier->attached_aio_context = attached_aio_context; | |
2542 | notifier->detach_aio_context = detach_aio_context; | |
2543 | notifier->opaque = opaque; | |
2544 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
2545 | ||
f21d96d0 KW |
2546 | if (bs) { |
2547 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2548 | detach_aio_context, opaque); |
2549 | } | |
2019ba0a HR |
2550 | } |
2551 | ||
2552 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
2553 | void (*attached_aio_context)(AioContext *, | |
2554 | void *), | |
2555 | void (*detach_aio_context)(void *), | |
2556 | void *opaque) | |
2557 | { | |
d03654ea | 2558 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
2559 | BlockDriverState *bs = blk_bs(blk); |
2560 | ||
0439c5a4 EGE |
2561 | GLOBAL_STATE_CODE(); |
2562 | ||
f21d96d0 KW |
2563 | if (bs) { |
2564 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2565 | detach_aio_context, opaque); |
2566 | } | |
d03654ea SH |
2567 | |
2568 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
2569 | if (notifier->attached_aio_context == attached_aio_context && | |
2570 | notifier->detach_aio_context == detach_aio_context && | |
2571 | notifier->opaque == opaque) { | |
2572 | QLIST_REMOVE(notifier, list); | |
2573 | g_free(notifier); | |
2574 | return; | |
2575 | } | |
2576 | } | |
2577 | ||
2578 | abort(); | |
2019ba0a HR |
2579 | } |
2580 | ||
3301f6c6 HR |
2581 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
2582 | { | |
0439c5a4 | 2583 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2584 | notifier_list_add(&blk->remove_bs_notifiers, notify); |
2585 | } | |
2586 | ||
2587 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
2588 | { | |
0439c5a4 | 2589 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2590 | notifier_list_add(&blk->insert_bs_notifiers, notify); |
2591 | } | |
2592 | ||
8f497454 | 2593 | void coroutine_fn blk_co_io_plug(BlockBackend *blk) |
4be74634 | 2594 | { |
f21d96d0 | 2595 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2596 | IO_CODE(); |
c3827069 | 2597 | GRAPH_RDLOCK_GUARD(); |
f21d96d0 KW |
2598 | |
2599 | if (bs) { | |
8f497454 | 2600 | bdrv_co_io_plug(bs); |
a46fc9c9 | 2601 | } |
4be74634 MA |
2602 | } |
2603 | ||
09d9fc97 | 2604 | void coroutine_fn blk_co_io_unplug(BlockBackend *blk) |
4be74634 | 2605 | { |
f21d96d0 | 2606 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2607 | IO_CODE(); |
c3827069 | 2608 | GRAPH_RDLOCK_GUARD(); |
f21d96d0 KW |
2609 | |
2610 | if (bs) { | |
09d9fc97 | 2611 | bdrv_co_io_unplug(bs); |
a46fc9c9 | 2612 | } |
4be74634 MA |
2613 | } |
2614 | ||
2615 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
2616 | { | |
37868b2a | 2617 | IO_CODE(); |
7f0e9da6 | 2618 | return &blk->stats; |
4be74634 MA |
2619 | } |
2620 | ||
2621 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
2622 | BlockCompletionFunc *cb, void *opaque) | |
2623 | { | |
37868b2a | 2624 | IO_CODE(); |
4be74634 MA |
2625 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); |
2626 | } | |
1ef01253 | 2627 | |
d004bd52 | 2628 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
34460feb | 2629 | int64_t bytes, BdrvRequestFlags flags) |
1ef01253 | 2630 | { |
37868b2a | 2631 | IO_OR_GS_CODE(); |
f5a5ca79 | 2632 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 2633 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
2634 | } |
2635 | ||
2c9715fa AF |
2636 | int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset, |
2637 | int64_t bytes, const void *buf) | |
1ef01253 | 2638 | { |
06f0325c | 2639 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |
37868b2a | 2640 | IO_OR_GS_CODE(); |
2c9715fa AF |
2641 | return blk_co_pwritev_part(blk, offset, bytes, &qiov, 0, |
2642 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2643 | } |
2644 | ||
015ed252 AF |
2645 | int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact, |
2646 | PreallocMode prealloc, BdrvRequestFlags flags, | |
2647 | Error **errp) | |
1ef01253 | 2648 | { |
37868b2a | 2649 | IO_OR_GS_CODE(); |
c2b8e315 | 2650 | GRAPH_RDLOCK_GUARD(); |
c73ff92c | 2651 | if (!blk_co_is_available(blk)) { |
ed3d2ec9 | 2652 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2653 | return -ENOMEDIUM; |
2654 | } | |
2655 | ||
015ed252 | 2656 | return bdrv_co_truncate(blk->root, offset, exact, prealloc, flags, errp); |
1ef01253 HR |
2657 | } |
2658 | ||
1ef01253 HR |
2659 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, |
2660 | int64_t pos, int size) | |
2661 | { | |
bfd18d1e | 2662 | int ret; |
0439c5a4 | 2663 | GLOBAL_STATE_CODE(); |
bfd18d1e | 2664 | |
c09ba36c HR |
2665 | if (!blk_is_available(blk)) { |
2666 | return -ENOMEDIUM; | |
2667 | } | |
2668 | ||
bfd18d1e KW |
2669 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2670 | if (ret < 0) { | |
2671 | return ret; | |
2672 | } | |
2673 | ||
2674 | if (ret == size && !blk->enable_write_cache) { | |
2675 | ret = bdrv_flush(blk_bs(blk)); | |
2676 | } | |
2677 | ||
2678 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2679 | } |
2680 | ||
2681 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2682 | { | |
0439c5a4 | 2683 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2684 | if (!blk_is_available(blk)) { |
2685 | return -ENOMEDIUM; | |
2686 | } | |
2687 | ||
f21d96d0 | 2688 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2689 | } |
f0272c4d ET |
2690 | |
2691 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2692 | { | |
0439c5a4 | 2693 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2694 | if (!blk_is_available(blk)) { |
2695 | return -ENOMEDIUM; | |
2696 | } | |
2697 | ||
f21d96d0 | 2698 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2699 | } |
2700 | ||
2701 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2702 | { | |
0439c5a4 | 2703 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2704 | if (!blk_is_available(blk)) { |
2705 | return -ENOMEDIUM; | |
2706 | } | |
2707 | ||
f21d96d0 | 2708 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2709 | } |
281d22d8 HR |
2710 | |
2711 | /* | |
2712 | * Updates the BlockBackendRootState object with data from the currently | |
2713 | * attached BlockDriverState. | |
2714 | */ | |
2715 | void blk_update_root_state(BlockBackend *blk) | |
2716 | { | |
0439c5a4 | 2717 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2718 | assert(blk->root); |
281d22d8 | 2719 | |
f21d96d0 | 2720 | blk->root_state.open_flags = blk->root->bs->open_flags; |
f21d96d0 | 2721 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; |
281d22d8 HR |
2722 | } |
2723 | ||
38cb18f5 | 2724 | /* |
b85114f8 KW |
2725 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2726 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2727 | */ |
b85114f8 | 2728 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2729 | { |
0439c5a4 | 2730 | GLOBAL_STATE_CODE(); |
b85114f8 | 2731 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2732 | } |
2733 | ||
2734 | /* | |
2735 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2736 | * supposed to inherit the root state. | |
2737 | */ | |
2738 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2739 | { | |
0439c5a4 | 2740 | GLOBAL_STATE_CODE(); |
260242a8 | 2741 | return blk->root_state.open_flags; |
38cb18f5 HR |
2742 | } |
2743 | ||
281d22d8 HR |
2744 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2745 | { | |
0439c5a4 | 2746 | GLOBAL_STATE_CODE(); |
281d22d8 HR |
2747 | return &blk->root_state; |
2748 | } | |
1393f212 HR |
2749 | |
2750 | int blk_commit_all(void) | |
2751 | { | |
fe1a9cbc | 2752 | BlockBackend *blk = NULL; |
0439c5a4 | 2753 | GLOBAL_STATE_CODE(); |
fe1a9cbc HR |
2754 | |
2755 | while ((blk = blk_all_next(blk)) != NULL) { | |
2756 | AioContext *aio_context = blk_get_aio_context(blk); | |
9a71b9de | 2757 | BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk)); |
fe1a9cbc HR |
2758 | |
2759 | aio_context_acquire(aio_context); | |
9a71b9de HR |
2760 | if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) { |
2761 | int ret; | |
2762 | ||
2763 | ret = bdrv_commit(unfiltered_bs); | |
fe1a9cbc HR |
2764 | if (ret < 0) { |
2765 | aio_context_release(aio_context); | |
2766 | return ret; | |
2767 | } | |
2768 | } | |
2769 | aio_context_release(aio_context); | |
2770 | } | |
2771 | return 0; | |
2772 | } | |
2773 | ||
97148076 KW |
2774 | |
2775 | /* throttling disk I/O limits */ | |
2776 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2777 | { | |
0439c5a4 | 2778 | GLOBAL_STATE_CODE(); |
022cdc9f | 2779 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2780 | } |
2781 | ||
2782 | void blk_io_limits_disable(BlockBackend *blk) | |
2783 | { | |
48bf7ea8 AG |
2784 | BlockDriverState *bs = blk_bs(blk); |
2785 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2786 | assert(tgm->throttle_state); | |
0439c5a4 | 2787 | GLOBAL_STATE_CODE(); |
48bf7ea8 | 2788 | if (bs) { |
1e3552db | 2789 | bdrv_ref(bs); |
48bf7ea8 AG |
2790 | bdrv_drained_begin(bs); |
2791 | } | |
2792 | throttle_group_unregister_tgm(tgm); | |
2793 | if (bs) { | |
2794 | bdrv_drained_end(bs); | |
1e3552db | 2795 | bdrv_unref(bs); |
48bf7ea8 | 2796 | } |
97148076 KW |
2797 | } |
2798 | ||
2799 | /* should be called before blk_set_io_limits if a limit is set */ | |
2800 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2801 | { | |
022cdc9f | 2802 | assert(!blk->public.throttle_group_member.throttle_state); |
0439c5a4 | 2803 | GLOBAL_STATE_CODE(); |
c61791fc MP |
2804 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2805 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2806 | } |
2807 | ||
2808 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2809 | { | |
0439c5a4 | 2810 | GLOBAL_STATE_CODE(); |
97148076 | 2811 | /* this BB is not part of any group */ |
022cdc9f | 2812 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2813 | return; |
2814 | } | |
2815 | ||
2816 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2817 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2818 | group)) { | |
97148076 KW |
2819 | return; |
2820 | } | |
2821 | ||
2822 | /* need to change the group this bs belong to */ | |
2823 | blk_io_limits_disable(blk); | |
2824 | blk_io_limits_enable(blk, group); | |
2825 | } | |
c2066af0 KW |
2826 | |
2827 | static void blk_root_drained_begin(BdrvChild *child) | |
2828 | { | |
2829 | BlockBackend *blk = child->opaque; | |
d73415a3 | 2830 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
c2066af0 | 2831 | |
c4d5bf99 | 2832 | if (qatomic_fetch_inc(&blk->quiesce_counter) == 0) { |
f4d9cc88 JS |
2833 | if (blk->dev_ops && blk->dev_ops->drained_begin) { |
2834 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2835 | } | |
2836 | } | |
2837 | ||
36fe1331 KW |
2838 | /* Note that blk->root may not be accessible here yet if we are just |
2839 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2840 | ||
d73415a3 SH |
2841 | if (qatomic_fetch_inc(&tgm->io_limits_disabled) == 0) { |
2842 | throttle_group_restart_tgm(tgm); | |
c2066af0 KW |
2843 | } |
2844 | } | |
2845 | ||
fe5258a5 KW |
2846 | static bool blk_root_drained_poll(BdrvChild *child) |
2847 | { | |
2848 | BlockBackend *blk = child->opaque; | |
095cc4d0 | 2849 | bool busy = false; |
c4d5bf99 | 2850 | assert(qatomic_read(&blk->quiesce_counter)); |
095cc4d0 SL |
2851 | |
2852 | if (blk->dev_ops && blk->dev_ops->drained_poll) { | |
2853 | busy = blk->dev_ops->drained_poll(blk->dev_opaque); | |
2854 | } | |
2855 | return busy || !!blk->in_flight; | |
fe5258a5 KW |
2856 | } |
2857 | ||
2f65df6e | 2858 | static void blk_root_drained_end(BdrvChild *child) |
c2066af0 KW |
2859 | { |
2860 | BlockBackend *blk = child->opaque; | |
c4d5bf99 | 2861 | assert(qatomic_read(&blk->quiesce_counter)); |
c2066af0 | 2862 | |
022cdc9f | 2863 | assert(blk->public.throttle_group_member.io_limits_disabled); |
d73415a3 | 2864 | qatomic_dec(&blk->public.throttle_group_member.io_limits_disabled); |
f4d9cc88 | 2865 | |
c4d5bf99 | 2866 | if (qatomic_fetch_dec(&blk->quiesce_counter) == 1) { |
f4d9cc88 JS |
2867 | if (blk->dev_ops && blk->dev_ops->drained_end) { |
2868 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2869 | } | |
407ae2ae SH |
2870 | qemu_mutex_lock(&blk->queued_requests_lock); |
2871 | while (qemu_co_enter_next(&blk->queued_requests, | |
2872 | &blk->queued_requests_lock)) { | |
cf312932 KW |
2873 | /* Resume all queued requests */ |
2874 | } | |
407ae2ae | 2875 | qemu_mutex_unlock(&blk->queued_requests_lock); |
f4d9cc88 | 2876 | } |
c2066af0 | 2877 | } |
23d0ba93 | 2878 | |
f4ec04ba | 2879 | bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp) |
23d0ba93 | 2880 | { |
71038951 SH |
2881 | BlockDriverState *bs = blk_bs(blk); |
2882 | ||
0439c5a4 | 2883 | GLOBAL_STATE_CODE(); |
71038951 SH |
2884 | |
2885 | if (bs) { | |
2886 | return bdrv_register_buf(bs, host, size, errp); | |
2887 | } | |
2888 | return true; | |
23d0ba93 FZ |
2889 | } |
2890 | ||
4f384011 | 2891 | void blk_unregister_buf(BlockBackend *blk, void *host, size_t size) |
23d0ba93 | 2892 | { |
71038951 SH |
2893 | BlockDriverState *bs = blk_bs(blk); |
2894 | ||
0439c5a4 | 2895 | GLOBAL_STATE_CODE(); |
71038951 SH |
2896 | |
2897 | if (bs) { | |
2898 | bdrv_unregister_buf(bs, host, size); | |
2899 | } | |
23d0ba93 | 2900 | } |
b5679fa4 FZ |
2901 | |
2902 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2903 | BlockBackend *blk_out, int64_t off_out, | |
e192179b | 2904 | int64_t bytes, BdrvRequestFlags read_flags, |
67b51fb9 | 2905 | BdrvRequestFlags write_flags) |
b5679fa4 FZ |
2906 | { |
2907 | int r; | |
37868b2a | 2908 | IO_CODE(); |
c73ff92c | 2909 | GRAPH_RDLOCK_GUARD(); |
37868b2a | 2910 | |
b5679fa4 FZ |
2911 | r = blk_check_byte_request(blk_in, off_in, bytes); |
2912 | if (r) { | |
2913 | return r; | |
2914 | } | |
2915 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2916 | if (r) { | |
2917 | return r; | |
2918 | } | |
742bf09b | 2919 | |
b5679fa4 FZ |
2920 | return bdrv_co_copy_range(blk_in->root, off_in, |
2921 | blk_out->root, off_out, | |
67b51fb9 | 2922 | bytes, read_flags, write_flags); |
b5679fa4 | 2923 | } |
5d3b4e99 VSO |
2924 | |
2925 | const BdrvChild *blk_root(BlockBackend *blk) | |
2926 | { | |
0439c5a4 | 2927 | GLOBAL_STATE_CODE(); |
5d3b4e99 VSO |
2928 | return blk->root; |
2929 | } | |
2b7bbdbd HR |
2930 | |
2931 | int blk_make_empty(BlockBackend *blk, Error **errp) | |
2932 | { | |
0439c5a4 | 2933 | GLOBAL_STATE_CODE(); |
2b7bbdbd HR |
2934 | if (!blk_is_available(blk)) { |
2935 | error_setg(errp, "No medium inserted"); | |
2936 | return -ENOMEDIUM; | |
2937 | } | |
2938 | ||
2939 | return bdrv_make_empty(blk->root, errp); | |
2940 | } |