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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 | ||
d03654ea SH |
36 | typedef struct BlockBackendAioNotifier { |
37 | void (*attached_aio_context)(AioContext *new_context, void *opaque); | |
38 | void (*detach_aio_context)(void *opaque); | |
39 | void *opaque; | |
40 | QLIST_ENTRY(BlockBackendAioNotifier) list; | |
41 | } BlockBackendAioNotifier; | |
42 | ||
26f54e9a MA |
43 | struct BlockBackend { |
44 | char *name; | |
45 | int refcnt; | |
f21d96d0 | 46 | BdrvChild *root; |
ad893672 | 47 | AioContext *ctx; /* access with atomic operations only */ |
26f8b3a8 | 48 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 49 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 50 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 51 | BlockBackendPublic public; |
a7f53e26 | 52 | |
d09ea2d2 | 53 | DeviceState *dev; /* attached device model, if any */ |
a7f53e26 MA |
54 | const BlockDevOps *dev_ops; |
55 | void *dev_opaque; | |
68e9ec01 | 56 | |
281d22d8 HR |
57 | /* If the BDS tree is removed, some of its options are stored here (which |
58 | * can be used to restore those options in the new BDS on insert) */ | |
59 | BlockBackendRootState root_state; | |
60 | ||
bfd18d1e KW |
61 | bool enable_write_cache; |
62 | ||
7f0e9da6 HR |
63 | /* I/O stats (display with "info blockstats"). */ |
64 | BlockAcctStats stats; | |
373340b2 HR |
65 | |
66 | BlockdevOnError on_read_error, on_write_error; | |
67 | bool iostatus_enabled; | |
68 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 69 | |
981776b3 KW |
70 | uint64_t perm; |
71 | uint64_t shared_perm; | |
d35ff5e6 | 72 | bool disable_perm; |
981776b3 | 73 | |
980b0f94 | 74 | bool allow_aio_context_change; |
c10c9d96 KW |
75 | bool allow_write_beyond_eof; |
76 | ||
a2c4c3b1 | 77 | /* Protected by BQL */ |
3301f6c6 | 78 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
d03654ea | 79 | QLIST_HEAD(, BlockBackendAioNotifier) aio_notifiers; |
f4d9cc88 | 80 | |
c4d5bf99 | 81 | int quiesce_counter; /* atomic: written under BQL, read by other threads */ |
407ae2ae | 82 | QemuMutex queued_requests_lock; /* protects queued_requests */ |
cf312932 | 83 | CoQueue queued_requests; |
ef80ec50 | 84 | bool disable_request_queuing; /* atomic */ |
cf312932 | 85 | |
5f7772c4 | 86 | VMChangeStateEntry *vmsh; |
ca2e2144 | 87 | bool force_allow_inactivate; |
33f2a757 SH |
88 | |
89 | /* Number of in-flight aio requests. BlockDriverState also counts | |
90 | * in-flight requests but aio requests can exist even when blk->root is | |
91 | * NULL, so we cannot rely on its counter for that case. | |
92 | * Accessed with atomic ops. | |
93 | */ | |
94 | unsigned int in_flight; | |
26f54e9a MA |
95 | }; |
96 | ||
e7f7d676 HR |
97 | typedef struct BlockBackendAIOCB { |
98 | BlockAIOCB common; | |
4981bdec | 99 | BlockBackend *blk; |
e7f7d676 HR |
100 | int ret; |
101 | } BlockBackendAIOCB; | |
102 | ||
103 | static const AIOCBInfo block_backend_aiocb_info = { | |
104 | .aiocb_size = sizeof(BlockBackendAIOCB), | |
105 | }; | |
106 | ||
8fb3c76c | 107 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 108 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
8fb3c76c | 109 | |
a2c4c3b1 | 110 | /* All BlockBackends. Protected by BQL. */ |
2cf22d6a HR |
111 | static QTAILQ_HEAD(, BlockBackend) block_backends = |
112 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
113 | ||
a2c4c3b1 EGE |
114 | /* |
115 | * All BlockBackends referenced by the monitor and which are iterated through by | |
116 | * blk_next(). Protected by BQL. | |
117 | */ | |
9492b0b9 HR |
118 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = |
119 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 120 | |
3804e3cf KW |
121 | static int coroutine_mixed_fn GRAPH_RDLOCK |
122 | blk_set_perm_locked(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
123 | Error **errp); | |
124 | ||
3cdc69d3 | 125 | static void blk_root_inherit_options(BdrvChildRole role, bool parent_is_format, |
272c02ea | 126 | int *child_flags, QDict *child_options, |
f21d96d0 KW |
127 | int parent_flags, QDict *parent_options) |
128 | { | |
129 | /* We're not supposed to call this function for root nodes */ | |
130 | abort(); | |
131 | } | |
c2066af0 | 132 | static void blk_root_drained_begin(BdrvChild *child); |
fe5258a5 | 133 | static bool blk_root_drained_poll(BdrvChild *child); |
2f65df6e | 134 | static void blk_root_drained_end(BdrvChild *child); |
f21d96d0 | 135 | |
5c8cab48 KW |
136 | static void blk_root_change_media(BdrvChild *child, bool load); |
137 | static void blk_root_resize(BdrvChild *child); | |
138 | ||
33949396 EGE |
139 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
140 | GHashTable *visited, Transaction *tran, | |
141 | Error **errp); | |
38475269 | 142 | |
b5411555 KW |
143 | static char *blk_root_get_parent_desc(BdrvChild *child) |
144 | { | |
145 | BlockBackend *blk = child->opaque; | |
fd240a18 | 146 | g_autofree char *dev_id = NULL; |
b5411555 KW |
147 | |
148 | if (blk->name) { | |
fd240a18 | 149 | return g_strdup_printf("block device '%s'", blk->name); |
b5411555 KW |
150 | } |
151 | ||
152 | dev_id = blk_get_attached_dev_id(blk); | |
153 | if (*dev_id) { | |
fd240a18 | 154 | return g_strdup_printf("block device '%s'", dev_id); |
b5411555 KW |
155 | } else { |
156 | /* TODO Callback into the BB owner for something more detailed */ | |
fd240a18 | 157 | return g_strdup("an unnamed block device"); |
b5411555 KW |
158 | } |
159 | } | |
160 | ||
4c265bf9 KW |
161 | static const char *blk_root_get_name(BdrvChild *child) |
162 | { | |
163 | return blk_name(child->opaque); | |
164 | } | |
165 | ||
538f0497 | 166 | static void blk_vm_state_changed(void *opaque, bool running, RunState state) |
5f7772c4 FZ |
167 | { |
168 | Error *local_err = NULL; | |
169 | BlockBackend *blk = opaque; | |
170 | ||
171 | if (state == RUN_STATE_INMIGRATE) { | |
172 | return; | |
173 | } | |
174 | ||
175 | qemu_del_vm_change_state_handler(blk->vmsh); | |
176 | blk->vmsh = NULL; | |
177 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
178 | if (local_err) { | |
179 | error_report_err(local_err); | |
180 | } | |
181 | } | |
182 | ||
4417ab7a KW |
183 | /* |
184 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
185 | * devices can tighten their permissions in response (specifically revoke | |
186 | * shared write permissions that we needed for storage migration). | |
187 | * | |
188 | * If an error is returned, the VM cannot be allowed to be resumed. | |
189 | */ | |
3804e3cf | 190 | static void GRAPH_RDLOCK blk_root_activate(BdrvChild *child, Error **errp) |
4417ab7a KW |
191 | { |
192 | BlockBackend *blk = child->opaque; | |
193 | Error *local_err = NULL; | |
492a1196 | 194 | uint64_t saved_shared_perm; |
4417ab7a KW |
195 | |
196 | if (!blk->disable_perm) { | |
197 | return; | |
198 | } | |
199 | ||
200 | blk->disable_perm = false; | |
201 | ||
492a1196 HR |
202 | /* |
203 | * blk->shared_perm contains the permissions we want to share once | |
204 | * migration is really completely done. For now, we need to share | |
205 | * all; but we also need to retain blk->shared_perm, which is | |
206 | * overwritten by a successful blk_set_perm() call. Save it and | |
207 | * restore it below. | |
208 | */ | |
209 | saved_shared_perm = blk->shared_perm; | |
210 | ||
3804e3cf | 211 | blk_set_perm_locked(blk, blk->perm, BLK_PERM_ALL, &local_err); |
5f7772c4 FZ |
212 | if (local_err) { |
213 | error_propagate(errp, local_err); | |
214 | blk->disable_perm = true; | |
215 | return; | |
216 | } | |
492a1196 | 217 | blk->shared_perm = saved_shared_perm; |
5f7772c4 FZ |
218 | |
219 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
220 | /* Activation can happen when migration process is still active, for | |
221 | * example when nbd_server_add is called during non-shared storage | |
222 | * migration. Defer the shared_perm update to migration completion. */ | |
223 | if (!blk->vmsh) { | |
224 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
225 | blk); | |
226 | } | |
227 | return; | |
228 | } | |
229 | ||
3804e3cf | 230 | blk_set_perm_locked(blk, blk->perm, blk->shared_perm, &local_err); |
4417ab7a KW |
231 | if (local_err) { |
232 | error_propagate(errp, local_err); | |
233 | blk->disable_perm = true; | |
234 | return; | |
235 | } | |
236 | } | |
237 | ||
ca2e2144 FZ |
238 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
239 | { | |
0439c5a4 | 240 | GLOBAL_STATE_CODE(); |
ca2e2144 FZ |
241 | blk->force_allow_inactivate = true; |
242 | } | |
243 | ||
c16de8f5 FZ |
244 | static bool blk_can_inactivate(BlockBackend *blk) |
245 | { | |
ca2e2144 | 246 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
247 | if (blk->dev || blk_name(blk)[0]) { |
248 | return true; | |
249 | } | |
250 | ||
ca2e2144 FZ |
251 | /* Inactivating means no more writes to the image can be done, |
252 | * even if those writes would be changes invisible to the | |
253 | * guest. For block job BBs that satisfy this, we can just allow | |
254 | * it. This is the case for mirror job source, which is required | |
255 | * by libvirt non-shared block migration. */ | |
256 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
257 | return true; | |
258 | } | |
259 | ||
260 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
261 | } |
262 | ||
3804e3cf | 263 | static int GRAPH_RDLOCK blk_root_inactivate(BdrvChild *child) |
cfa1a572 KW |
264 | { |
265 | BlockBackend *blk = child->opaque; | |
266 | ||
267 | if (blk->disable_perm) { | |
268 | return 0; | |
269 | } | |
270 | ||
c16de8f5 | 271 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
272 | return -EPERM; |
273 | } | |
274 | ||
275 | blk->disable_perm = true; | |
276 | if (blk->root) { | |
277 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
278 | } | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
d03654ea SH |
283 | static void blk_root_attach(BdrvChild *child) |
284 | { | |
285 | BlockBackend *blk = child->opaque; | |
286 | BlockBackendAioNotifier *notifier; | |
287 | ||
288 | trace_blk_root_attach(child, blk, child->bs); | |
289 | ||
290 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
291 | bdrv_add_aio_context_notifier(child->bs, | |
292 | notifier->attached_aio_context, | |
293 | notifier->detach_aio_context, | |
294 | notifier->opaque); | |
295 | } | |
296 | } | |
297 | ||
298 | static void blk_root_detach(BdrvChild *child) | |
299 | { | |
300 | BlockBackend *blk = child->opaque; | |
301 | BlockBackendAioNotifier *notifier; | |
302 | ||
303 | trace_blk_root_detach(child, blk, child->bs); | |
304 | ||
305 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
306 | bdrv_remove_aio_context_notifier(child->bs, | |
307 | notifier->attached_aio_context, | |
308 | notifier->detach_aio_context, | |
309 | notifier->opaque); | |
310 | } | |
311 | } | |
312 | ||
3ca1f322 VSO |
313 | static AioContext *blk_root_get_parent_aio_context(BdrvChild *c) |
314 | { | |
315 | BlockBackend *blk = c->opaque; | |
d5f8d79c | 316 | IO_CODE(); |
3ca1f322 VSO |
317 | |
318 | return blk_get_aio_context(blk); | |
319 | } | |
320 | ||
bd86fb99 | 321 | static const BdrvChildClass child_root = { |
c2066af0 KW |
322 | .inherit_options = blk_root_inherit_options, |
323 | ||
5c8cab48 KW |
324 | .change_media = blk_root_change_media, |
325 | .resize = blk_root_resize, | |
4c265bf9 | 326 | .get_name = blk_root_get_name, |
b5411555 | 327 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 328 | |
c2066af0 | 329 | .drained_begin = blk_root_drained_begin, |
fe5258a5 | 330 | .drained_poll = blk_root_drained_poll, |
c2066af0 | 331 | .drained_end = blk_root_drained_end, |
4417ab7a KW |
332 | |
333 | .activate = blk_root_activate, | |
cfa1a572 | 334 | .inactivate = blk_root_inactivate, |
d03654ea SH |
335 | |
336 | .attach = blk_root_attach, | |
337 | .detach = blk_root_detach, | |
38475269 | 338 | |
33949396 | 339 | .change_aio_ctx = blk_root_change_aio_ctx, |
3ca1f322 VSO |
340 | |
341 | .get_parent_aio_context = blk_root_get_parent_aio_context, | |
f21d96d0 KW |
342 | }; |
343 | ||
26f54e9a | 344 | /* |
efaa7c4e | 345 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
346 | * |
347 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
348 | * to request for a block driver node that is attached to this BlockBackend. | |
349 | * @shared_perm is a bitmask which describes which permissions may be granted | |
350 | * to other users of the attached node. | |
351 | * Both sets of permissions can be changed later using blk_set_perm(). | |
352 | * | |
26f54e9a MA |
353 | * Return the new BlockBackend on success, null on failure. |
354 | */ | |
d861ab3a | 355 | BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
356 | { |
357 | BlockBackend *blk; | |
358 | ||
0439c5a4 EGE |
359 | GLOBAL_STATE_CODE(); |
360 | ||
26f54e9a | 361 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 362 | blk->refcnt = 1; |
d861ab3a | 363 | blk->ctx = ctx; |
6d0eb64d KW |
364 | blk->perm = perm; |
365 | blk->shared_perm = shared_perm; | |
0c3169df KW |
366 | blk_set_enable_write_cache(blk, true); |
367 | ||
cb53460b KW |
368 | blk->on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
369 | blk->on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
370 | ||
9caa6f3d | 371 | block_acct_init(&blk->stats); |
27ccdd52 | 372 | |
407ae2ae | 373 | qemu_mutex_init(&blk->queued_requests_lock); |
cf312932 | 374 | qemu_co_queue_init(&blk->queued_requests); |
3301f6c6 HR |
375 | notifier_list_init(&blk->remove_bs_notifiers); |
376 | notifier_list_init(&blk->insert_bs_notifiers); | |
d03654ea | 377 | QLIST_INIT(&blk->aio_notifiers); |
27ccdd52 | 378 | |
2cf22d6a | 379 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
380 | return blk; |
381 | } | |
382 | ||
a3aeeab5 EB |
383 | /* |
384 | * Create a new BlockBackend connected to an existing BlockDriverState. | |
385 | * | |
386 | * @perm is a bitmasks of BLK_PERM_* constants which describes the | |
387 | * permissions to request for @bs that is attached to this | |
388 | * BlockBackend. @shared_perm is a bitmask which describes which | |
389 | * permissions may be granted to other users of the attached node. | |
390 | * Both sets of permissions can be changed later using blk_set_perm(). | |
391 | * | |
392 | * Return the new BlockBackend on success, null on failure. | |
393 | */ | |
394 | BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm, | |
395 | uint64_t shared_perm, Error **errp) | |
396 | { | |
397 | BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm); | |
398 | ||
0439c5a4 EGE |
399 | GLOBAL_STATE_CODE(); |
400 | ||
a3aeeab5 EB |
401 | if (blk_insert_bs(blk, bs, errp) < 0) { |
402 | blk_unref(blk); | |
403 | return NULL; | |
404 | } | |
405 | return blk; | |
406 | } | |
407 | ||
7e7d56d9 | 408 | /* |
28eb9b12 | 409 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
4c20dd24 KW |
410 | * By default, the new BlockBackend is in the main AioContext, but if the |
411 | * parameters connect it with any existing node in a different AioContext, it | |
412 | * may end up there instead. | |
ca49a4fd HR |
413 | * |
414 | * Just as with bdrv_open(), after having called this function the reference to | |
415 | * @options belongs to the block layer (even on failure). | |
416 | * | |
417 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
418 | * BDS tree just by specifying the @options QDict (or @reference, | |
419 | * alternatively). At the time of adding this function, this is not possible, | |
420 | * though, so callers of this function have to be able to specify @filename and | |
421 | * @flags. | |
422 | */ | |
efaa7c4e HR |
423 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
424 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
425 | { |
426 | BlockBackend *blk; | |
28eb9b12 | 427 | BlockDriverState *bs; |
1f4ad7d3 | 428 | uint64_t perm = 0; |
35b7f4ab | 429 | uint64_t shared = BLK_PERM_ALL; |
c62d32f5 | 430 | |
0439c5a4 EGE |
431 | GLOBAL_STATE_CODE(); |
432 | ||
35b7f4ab KW |
433 | /* |
434 | * blk_new_open() is mainly used in .bdrv_create implementations and the | |
435 | * tools where sharing isn't a major concern because the BDS stays private | |
436 | * and the file is generally not supposed to be used by a second process, | |
437 | * so we just request permission according to the flags. | |
c62d32f5 KW |
438 | * |
439 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
440 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
441 | * shouldn't hurt either. We can still share everything here because the | |
35b7f4ab KW |
442 | * guest devices will add their own blockers if they can't share. |
443 | */ | |
1f4ad7d3 KW |
444 | if ((flags & BDRV_O_NO_IO) == 0) { |
445 | perm |= BLK_PERM_CONSISTENT_READ; | |
446 | if (flags & BDRV_O_RDWR) { | |
447 | perm |= BLK_PERM_WRITE; | |
448 | } | |
c62d32f5 KW |
449 | } |
450 | if (flags & BDRV_O_RESIZE) { | |
451 | perm |= BLK_PERM_RESIZE; | |
452 | } | |
35b7f4ab KW |
453 | if (flags & BDRV_O_NO_SHARE) { |
454 | shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; | |
455 | } | |
ca49a4fd | 456 | |
5b363937 HR |
457 | bs = bdrv_open(filename, reference, options, flags, errp); |
458 | if (!bs) { | |
ca49a4fd HR |
459 | return NULL; |
460 | } | |
461 | ||
4c20dd24 | 462 | /* bdrv_open() could have moved bs to a different AioContext */ |
4c20dd24 KW |
463 | blk = blk_new(bdrv_get_aio_context(bs), perm, shared); |
464 | blk->perm = perm; | |
465 | blk->shared_perm = shared; | |
466 | ||
4c20dd24 KW |
467 | blk_insert_bs(blk, bs, errp); |
468 | bdrv_unref(bs); | |
4c20dd24 | 469 | |
50bfbe93 | 470 | if (!blk->root) { |
50bfbe93 FZ |
471 | blk_unref(blk); |
472 | return NULL; | |
473 | } | |
72e775c7 | 474 | |
ca49a4fd HR |
475 | return blk; |
476 | } | |
477 | ||
26f54e9a MA |
478 | static void blk_delete(BlockBackend *blk) |
479 | { | |
480 | assert(!blk->refcnt); | |
e5e78550 | 481 | assert(!blk->name); |
a7f53e26 | 482 | assert(!blk->dev); |
022cdc9f | 483 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
484 | blk_io_limits_disable(blk); |
485 | } | |
f21d96d0 | 486 | if (blk->root) { |
13855c6b | 487 | blk_remove_bs(blk); |
7e7d56d9 | 488 | } |
5f7772c4 FZ |
489 | if (blk->vmsh) { |
490 | qemu_del_vm_change_state_handler(blk->vmsh); | |
491 | blk->vmsh = NULL; | |
492 | } | |
3301f6c6 HR |
493 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
494 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 495 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
407ae2ae SH |
496 | assert(qemu_co_queue_empty(&blk->queued_requests)); |
497 | qemu_mutex_destroy(&blk->queued_requests_lock); | |
2cf22d6a | 498 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 499 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 500 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
501 | g_free(blk); |
502 | } | |
503 | ||
8fb3c76c MA |
504 | static void drive_info_del(DriveInfo *dinfo) |
505 | { | |
506 | if (!dinfo) { | |
507 | return; | |
508 | } | |
509 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
510 | g_free(dinfo); |
511 | } | |
512 | ||
f636ae85 AG |
513 | int blk_get_refcnt(BlockBackend *blk) |
514 | { | |
0439c5a4 | 515 | GLOBAL_STATE_CODE(); |
f636ae85 AG |
516 | return blk ? blk->refcnt : 0; |
517 | } | |
518 | ||
26f54e9a MA |
519 | /* |
520 | * Increment @blk's reference count. | |
521 | * @blk must not be null. | |
522 | */ | |
523 | void blk_ref(BlockBackend *blk) | |
524 | { | |
5ca9d21b | 525 | assert(blk->refcnt > 0); |
0439c5a4 | 526 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
527 | blk->refcnt++; |
528 | } | |
529 | ||
530 | /* | |
531 | * Decrement @blk's reference count. | |
532 | * If this drops it to zero, destroy @blk. | |
533 | * For convenience, do nothing if @blk is null. | |
534 | */ | |
535 | void blk_unref(BlockBackend *blk) | |
536 | { | |
0439c5a4 | 537 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
538 | if (blk) { |
539 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
540 | if (blk->refcnt > 1) { |
541 | blk->refcnt--; | |
542 | } else { | |
543 | blk_drain(blk); | |
544 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
545 | assert(blk->refcnt == 1); | |
546 | blk->refcnt = 0; | |
26f54e9a MA |
547 | blk_delete(blk); |
548 | } | |
549 | } | |
550 | } | |
551 | ||
2cf22d6a HR |
552 | /* |
553 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
554 | * ones which are hidden (i.e. are not referenced by the monitor). | |
555 | */ | |
a429b9b5 | 556 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a | 557 | { |
0439c5a4 | 558 | GLOBAL_STATE_CODE(); |
2cf22d6a HR |
559 | return blk ? QTAILQ_NEXT(blk, link) |
560 | : QTAILQ_FIRST(&block_backends); | |
561 | } | |
562 | ||
d8da3cef HR |
563 | void blk_remove_all_bs(void) |
564 | { | |
74d1b8fc | 565 | BlockBackend *blk = NULL; |
d8da3cef | 566 | |
0439c5a4 EGE |
567 | GLOBAL_STATE_CODE(); |
568 | ||
2cf22d6a | 569 | while ((blk = blk_all_next(blk)) != NULL) { |
f21d96d0 | 570 | if (blk->root) { |
d8da3cef HR |
571 | blk_remove_bs(blk); |
572 | } | |
d8da3cef HR |
573 | } |
574 | } | |
575 | ||
26f54e9a | 576 | /* |
9492b0b9 | 577 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
578 | * If @blk is null, return the first one. |
579 | * Else, return @blk's next sibling, which may be null. | |
580 | * | |
581 | * To iterate over all BlockBackends, do | |
582 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
583 | * ... | |
584 | * } | |
585 | */ | |
586 | BlockBackend *blk_next(BlockBackend *blk) | |
587 | { | |
0439c5a4 | 588 | GLOBAL_STATE_CODE(); |
9492b0b9 HR |
589 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
590 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
591 | } |
592 | ||
7c8eece4 KW |
593 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
594 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 595 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 596 | { |
5e003f17 HR |
597 | BlockDriverState *bs, *old_bs; |
598 | ||
599 | /* Must be called from the main loop */ | |
600 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 601 | |
7c8eece4 KW |
602 | /* First, return all root nodes of BlockBackends. In order to avoid |
603 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
604 | * if the BB is the first one in the parent list of the BDS. */ | |
605 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
606 | BlockBackend *old_blk = it->blk; |
607 | ||
608 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
609 | ||
7c8eece4 KW |
610 | do { |
611 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
612 | bs = it->blk ? blk_bs(it->blk) : NULL; |
613 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 614 | |
5e003f17 HR |
615 | if (it->blk) { |
616 | blk_ref(it->blk); | |
617 | } | |
618 | blk_unref(old_blk); | |
619 | ||
88be7b4b | 620 | if (bs) { |
5e003f17 HR |
621 | bdrv_ref(bs); |
622 | bdrv_unref(old_bs); | |
88be7b4b | 623 | return bs; |
7c8eece4 KW |
624 | } |
625 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
626 | } else { |
627 | old_bs = it->bs; | |
7c8eece4 KW |
628 | } |
629 | ||
630 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
631 | * BDSes that are attached to a BlockBackend here; they have been handled | |
632 | * by the above block already */ | |
981f4f57 | 633 | do { |
7c8eece4 | 634 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
635 | bs = it->bs; |
636 | } while (bs && bdrv_has_blk(bs)); | |
637 | ||
5e003f17 HR |
638 | if (bs) { |
639 | bdrv_ref(bs); | |
640 | } | |
641 | bdrv_unref(old_bs); | |
642 | ||
88be7b4b KW |
643 | return bs; |
644 | } | |
645 | ||
5e003f17 | 646 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
647 | { |
648 | *it = (BdrvNextIterator) { | |
649 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
650 | }; | |
5e003f17 | 651 | } |
981f4f57 | 652 | |
5e003f17 HR |
653 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
654 | { | |
0439c5a4 | 655 | GLOBAL_STATE_CODE(); |
5e003f17 | 656 | bdrv_next_reset(it); |
88be7b4b | 657 | return bdrv_next(it); |
981f4f57 HR |
658 | } |
659 | ||
5e003f17 HR |
660 | /* Must be called when aborting a bdrv_next() iteration before |
661 | * bdrv_next() returns NULL */ | |
662 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
663 | { | |
664 | /* Must be called from the main loop */ | |
665 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
666 | ||
667 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
668 | if (it->blk) { | |
669 | bdrv_unref(blk_bs(it->blk)); | |
670 | blk_unref(it->blk); | |
671 | } | |
672 | } else { | |
673 | bdrv_unref(it->bs); | |
674 | } | |
675 | ||
676 | bdrv_next_reset(it); | |
677 | } | |
678 | ||
e5e78550 HR |
679 | /* |
680 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
681 | * the given @name acting as the handle for the monitor. | |
682 | * Strictly for use by blockdev.c. | |
683 | * | |
684 | * @name must not be null or empty. | |
685 | * | |
686 | * Returns true on success and false on failure. In the latter case, an Error | |
687 | * object is returned through @errp. | |
688 | */ | |
689 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
690 | { | |
691 | assert(!blk->name); | |
692 | assert(name && name[0]); | |
0439c5a4 | 693 | GLOBAL_STATE_CODE(); |
e5e78550 HR |
694 | |
695 | if (!id_wellformed(name)) { | |
696 | error_setg(errp, "Invalid device name"); | |
697 | return false; | |
698 | } | |
699 | if (blk_by_name(name)) { | |
700 | error_setg(errp, "Device with id '%s' already exists", name); | |
701 | return false; | |
702 | } | |
703 | if (bdrv_find_node(name)) { | |
704 | error_setg(errp, | |
705 | "Device name '%s' conflicts with an existing node name", | |
706 | name); | |
707 | return false; | |
708 | } | |
709 | ||
710 | blk->name = g_strdup(name); | |
711 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
712 | return true; | |
713 | } | |
714 | ||
715 | /* | |
716 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
717 | * Strictly for use by blockdev.c. | |
718 | */ | |
719 | void monitor_remove_blk(BlockBackend *blk) | |
720 | { | |
0439c5a4 EGE |
721 | GLOBAL_STATE_CODE(); |
722 | ||
e5e78550 HR |
723 | if (!blk->name) { |
724 | return; | |
725 | } | |
726 | ||
727 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
728 | g_free(blk->name); | |
729 | blk->name = NULL; | |
730 | } | |
731 | ||
26f54e9a | 732 | /* |
7e7d56d9 | 733 | * Return @blk's name, a non-null string. |
e5e78550 | 734 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 735 | */ |
0731a50f | 736 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 737 | { |
37868b2a | 738 | IO_CODE(); |
e5e78550 | 739 | return blk->name ?: ""; |
26f54e9a MA |
740 | } |
741 | ||
742 | /* | |
743 | * Return the BlockBackend with name @name if it exists, else null. | |
744 | * @name must not be null. | |
745 | */ | |
746 | BlockBackend *blk_by_name(const char *name) | |
747 | { | |
74d1b8fc | 748 | BlockBackend *blk = NULL; |
26f54e9a | 749 | |
0439c5a4 | 750 | GLOBAL_STATE_CODE(); |
26f54e9a | 751 | assert(name); |
74d1b8fc | 752 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
753 | if (!strcmp(name, blk->name)) { |
754 | return blk; | |
755 | } | |
756 | } | |
757 | return NULL; | |
758 | } | |
7e7d56d9 MA |
759 | |
760 | /* | |
761 | * Return the BlockDriverState attached to @blk if any, else null. | |
762 | */ | |
763 | BlockDriverState *blk_bs(BlockBackend *blk) | |
764 | { | |
37868b2a | 765 | IO_CODE(); |
f21d96d0 | 766 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
767 | } |
768 | ||
2b3912f1 | 769 | static BlockBackend * GRAPH_RDLOCK bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
770 | { |
771 | BdrvChild *child; | |
bdb73476 EGE |
772 | |
773 | GLOBAL_STATE_CODE(); | |
2b3912f1 | 774 | assert_bdrv_graph_readable(); |
bdb73476 | 775 | |
dde33812 | 776 | QLIST_FOREACH(child, &bs->parents, next_parent) { |
bd86fb99 | 777 | if (child->klass == &child_root) { |
7c8eece4 | 778 | return child->opaque; |
dde33812 KW |
779 | } |
780 | } | |
781 | ||
7c8eece4 KW |
782 | return NULL; |
783 | } | |
784 | ||
785 | /* | |
786 | * Returns true if @bs has an associated BlockBackend. | |
787 | */ | |
788 | bool bdrv_has_blk(BlockDriverState *bs) | |
789 | { | |
0439c5a4 | 790 | GLOBAL_STATE_CODE(); |
7c8eece4 | 791 | return bdrv_first_blk(bs) != NULL; |
dde33812 KW |
792 | } |
793 | ||
b6c1bae5 KW |
794 | /* |
795 | * Returns true if @bs has only BlockBackends as parents. | |
796 | */ | |
797 | bool bdrv_is_root_node(BlockDriverState *bs) | |
798 | { | |
799 | BdrvChild *c; | |
800 | ||
0439c5a4 | 801 | GLOBAL_STATE_CODE(); |
2b3912f1 KW |
802 | assert_bdrv_graph_readable(); |
803 | ||
b6c1bae5 | 804 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
bd86fb99 | 805 | if (c->klass != &child_root) { |
b6c1bae5 KW |
806 | return false; |
807 | } | |
808 | } | |
809 | ||
810 | return true; | |
811 | } | |
812 | ||
18e46a03 MA |
813 | /* |
814 | * Return @blk's DriveInfo if any, else null. | |
815 | */ | |
816 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
817 | { | |
c5be7445 | 818 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
819 | return blk->legacy_dinfo; |
820 | } | |
821 | ||
822 | /* | |
823 | * Set @blk's DriveInfo to @dinfo, and return it. | |
824 | * @blk must not have a DriveInfo set already. | |
825 | * No other BlockBackend may have the same DriveInfo set. | |
826 | */ | |
827 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
828 | { | |
829 | assert(!blk->legacy_dinfo); | |
c5be7445 | 830 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
831 | return blk->legacy_dinfo = dinfo; |
832 | } | |
833 | ||
834 | /* | |
835 | * Return the BlockBackend with DriveInfo @dinfo. | |
836 | * It must exist. | |
837 | */ | |
838 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
839 | { | |
74d1b8fc | 840 | BlockBackend *blk = NULL; |
c5be7445 | 841 | GLOBAL_STATE_CODE(); |
18e46a03 | 842 | |
74d1b8fc | 843 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
844 | if (blk->legacy_dinfo == dinfo) { |
845 | return blk; | |
846 | } | |
847 | } | |
848 | abort(); | |
849 | } | |
850 | ||
f2cd875d KW |
851 | /* |
852 | * Returns a pointer to the publicly accessible fields of @blk. | |
853 | */ | |
854 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
855 | { | |
0439c5a4 | 856 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
857 | return &blk->public; |
858 | } | |
859 | ||
860 | /* | |
861 | * Returns a BlockBackend given the associated @public fields. | |
862 | */ | |
863 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
864 | { | |
0439c5a4 | 865 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
866 | return container_of(public, BlockBackend, public); |
867 | } | |
868 | ||
1c95f7e1 HR |
869 | /* |
870 | * Disassociates the currently associated BlockDriverState from @blk. | |
871 | */ | |
872 | void blk_remove_bs(BlockBackend *blk) | |
873 | { | |
c89bcf3a | 874 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
e6cada92 | 875 | BdrvChild *root; |
022cdc9f | 876 | |
0439c5a4 EGE |
877 | GLOBAL_STATE_CODE(); |
878 | ||
3301f6c6 | 879 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 880 | if (tgm->throttle_state) { |
1e3552db SH |
881 | BlockDriverState *bs = blk_bs(blk); |
882 | ||
883 | /* | |
884 | * Take a ref in case blk_bs() changes across bdrv_drained_begin(), for | |
885 | * example, if a temporary filter node is removed by a blockjob. | |
886 | */ | |
887 | bdrv_ref(bs); | |
632a7735 | 888 | bdrv_drained_begin(bs); |
c89bcf3a AG |
889 | throttle_group_detach_aio_context(tgm); |
890 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 891 | bdrv_drained_end(bs); |
1e3552db | 892 | bdrv_unref(bs); |
a5614993 | 893 | } |
1c95f7e1 | 894 | |
7ca7f0f6 KW |
895 | blk_update_root_state(blk); |
896 | ||
f45280cb GK |
897 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
898 | * switch to a completion coroutine later on. Let's drain all I/O here | |
899 | * to avoid that and a potential QEMU crash. | |
900 | */ | |
901 | blk_drain(blk); | |
e6cada92 | 902 | root = blk->root; |
f21d96d0 | 903 | blk->root = NULL; |
ede01e46 | 904 | |
6bc30f19 | 905 | bdrv_graph_wrlock(); |
e6cada92 | 906 | bdrv_root_unref_child(root); |
6bc30f19 | 907 | bdrv_graph_wrunlock(); |
1c95f7e1 HR |
908 | } |
909 | ||
0c3c36d6 HR |
910 | /* |
911 | * Associates a new BlockDriverState with @blk. | |
912 | */ | |
d7086422 | 913 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 914 | { |
c89bcf3a | 915 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
6bc0bcc8 | 916 | |
0439c5a4 | 917 | GLOBAL_STATE_CODE(); |
b441dc71 | 918 | bdrv_ref(bs); |
6bc30f19 | 919 | bdrv_graph_wrlock(); |
1f38f04e HR |
920 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
921 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
228ca37e | 922 | blk->perm, blk->shared_perm, |
1f38f04e | 923 | blk, errp); |
6bc30f19 | 924 | bdrv_graph_wrunlock(); |
d7086422 KW |
925 | if (blk->root == NULL) { |
926 | return -EPERM; | |
927 | } | |
3301f6c6 HR |
928 | |
929 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
930 | if (tgm->throttle_state) { |
931 | throttle_group_detach_aio_context(tgm); | |
932 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 933 | } |
d7086422 KW |
934 | |
935 | return 0; | |
0c3c36d6 HR |
936 | } |
937 | ||
ed089506 VSO |
938 | /* |
939 | * Change BlockDriverState associated with @blk. | |
940 | */ | |
941 | int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp) | |
942 | { | |
0439c5a4 | 943 | GLOBAL_STATE_CODE(); |
ed089506 VSO |
944 | return bdrv_replace_child_bs(blk->root, new_bs, errp); |
945 | } | |
946 | ||
981776b3 KW |
947 | /* |
948 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
949 | */ | |
3804e3cf KW |
950 | static int coroutine_mixed_fn GRAPH_RDLOCK |
951 | blk_set_perm_locked(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
952 | Error **errp) | |
981776b3 KW |
953 | { |
954 | int ret; | |
0439c5a4 | 955 | GLOBAL_STATE_CODE(); |
981776b3 | 956 | |
d35ff5e6 | 957 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
958 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
959 | if (ret < 0) { | |
960 | return ret; | |
961 | } | |
962 | } | |
963 | ||
964 | blk->perm = perm; | |
965 | blk->shared_perm = shared_perm; | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
3804e3cf KW |
970 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, |
971 | Error **errp) | |
972 | { | |
973 | GLOBAL_STATE_CODE(); | |
974 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
975 | ||
976 | return blk_set_perm_locked(blk, perm, shared_perm, errp); | |
977 | } | |
978 | ||
887354bd KW |
979 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
980 | { | |
0439c5a4 | 981 | GLOBAL_STATE_CODE(); |
887354bd KW |
982 | *perm = blk->perm; |
983 | *shared_perm = blk->shared_perm; | |
984 | } | |
985 | ||
d09ea2d2 TH |
986 | /* |
987 | * Attach device model @dev to @blk. | |
988 | * Return 0 on success, -EBUSY when a device model is attached already. | |
989 | */ | |
990 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
4be74634 | 991 | { |
0439c5a4 | 992 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
993 | if (blk->dev) { |
994 | return -EBUSY; | |
995 | } | |
d35ff5e6 KW |
996 | |
997 | /* While migration is still incoming, we don't need to apply the | |
998 | * permissions of guest device BlockBackends. We might still have a block | |
999 | * job or NBD server writing to the image for storage migration. */ | |
1000 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
1001 | blk->disable_perm = true; | |
1002 | } | |
1003 | ||
84ebe375 | 1004 | blk_ref(blk); |
a7f53e26 | 1005 | blk->dev = dev; |
373340b2 | 1006 | blk_iostatus_reset(blk); |
d35ff5e6 | 1007 | |
a7f53e26 | 1008 | return 0; |
4be74634 MA |
1009 | } |
1010 | ||
a7f53e26 MA |
1011 | /* |
1012 | * Detach device model @dev from @blk. | |
1013 | * @dev must be currently attached to @blk. | |
1014 | */ | |
d09ea2d2 | 1015 | void blk_detach_dev(BlockBackend *blk, DeviceState *dev) |
4be74634 | 1016 | { |
a7f53e26 | 1017 | assert(blk->dev == dev); |
0439c5a4 | 1018 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1019 | blk->dev = NULL; |
1020 | blk->dev_ops = NULL; | |
1021 | blk->dev_opaque = NULL; | |
981776b3 | 1022 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 1023 | blk_unref(blk); |
4be74634 MA |
1024 | } |
1025 | ||
a7f53e26 MA |
1026 | /* |
1027 | * Return the device model attached to @blk if any, else null. | |
1028 | */ | |
d09ea2d2 | 1029 | DeviceState *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 | 1030 | { |
0439c5a4 | 1031 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1032 | return blk->dev; |
1033 | } | |
1034 | ||
2d76e724 KW |
1035 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
1036 | * device attached to the BlockBackend. */ | |
77beef83 | 1037 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 | 1038 | { |
d09ea2d2 | 1039 | DeviceState *dev = blk->dev; |
37868b2a | 1040 | IO_CODE(); |
2d76e724 KW |
1041 | |
1042 | if (!dev) { | |
1043 | return g_strdup(""); | |
1044 | } else if (dev->id) { | |
1045 | return g_strdup(dev->id); | |
1046 | } | |
602414d1 LM |
1047 | |
1048 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
1049 | } |
1050 | ||
1c89e1fa KW |
1051 | /* |
1052 | * Return the BlockBackend which has the device model @dev attached if it | |
1053 | * exists, else null. | |
1054 | * | |
1055 | * @dev must not be null. | |
1056 | */ | |
1057 | BlockBackend *blk_by_dev(void *dev) | |
1058 | { | |
1059 | BlockBackend *blk = NULL; | |
1060 | ||
0439c5a4 EGE |
1061 | GLOBAL_STATE_CODE(); |
1062 | ||
1c89e1fa KW |
1063 | assert(dev != NULL); |
1064 | while ((blk = blk_all_next(blk)) != NULL) { | |
1065 | if (blk->dev == dev) { | |
1066 | return blk; | |
1067 | } | |
1068 | } | |
1069 | return NULL; | |
1070 | } | |
1071 | ||
a7f53e26 MA |
1072 | /* |
1073 | * Set @blk's device model callbacks to @ops. | |
1074 | * @opaque is the opaque argument to pass to the callbacks. | |
1075 | * This is for use by device models. | |
1076 | */ | |
1077 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
1078 | void *opaque) | |
1079 | { | |
0439c5a4 | 1080 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1081 | blk->dev_ops = ops; |
1082 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
1083 | |
1084 | /* Are we currently quiesced? Should we enforce this right now? */ | |
c4d5bf99 | 1085 | if (qatomic_read(&blk->quiesce_counter) && ops && ops->drained_begin) { |
f4d9cc88 JS |
1086 | ops->drained_begin(opaque); |
1087 | } | |
a7f53e26 MA |
1088 | } |
1089 | ||
1090 | /* | |
1091 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
1092 | * |
1093 | * If @load is true, notify of media load. This action can fail, meaning that | |
1094 | * the medium cannot be loaded. @errp is set then. | |
1095 | * | |
1096 | * If @load is false, notify of media eject. This can never fail. | |
1097 | * | |
a7f53e26 MA |
1098 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
1099 | */ | |
39829a01 | 1100 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 | 1101 | { |
0439c5a4 | 1102 | GLOBAL_STATE_CODE(); |
a7f53e26 | 1103 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { |
f1f57066 | 1104 | bool tray_was_open, tray_is_open; |
39829a01 | 1105 | Error *local_err = NULL; |
a7f53e26 | 1106 | |
f1f57066 | 1107 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
1108 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
1109 | if (local_err) { | |
1110 | assert(load == true); | |
1111 | error_propagate(errp, local_err); | |
1112 | return; | |
1113 | } | |
f1f57066 HR |
1114 | tray_is_open = blk_dev_is_tray_open(blk); |
1115 | ||
1116 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 1117 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 1118 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 1119 | g_free(id); |
a7f53e26 MA |
1120 | } |
1121 | } | |
1122 | } | |
1123 | ||
5c8cab48 KW |
1124 | static void blk_root_change_media(BdrvChild *child, bool load) |
1125 | { | |
39829a01 | 1126 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
1127 | } |
1128 | ||
a7f53e26 MA |
1129 | /* |
1130 | * Does @blk's attached device model have removable media? | |
1131 | * %true if no device model is attached. | |
1132 | */ | |
1133 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
1134 | { | |
b4ad82aa | 1135 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1136 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); |
1137 | } | |
1138 | ||
8f3a73bc HR |
1139 | /* |
1140 | * Does @blk's attached device model have a tray? | |
1141 | */ | |
1142 | bool blk_dev_has_tray(BlockBackend *blk) | |
1143 | { | |
967d7905 | 1144 | IO_CODE(); |
8f3a73bc HR |
1145 | return blk->dev_ops && blk->dev_ops->is_tray_open; |
1146 | } | |
1147 | ||
a7f53e26 MA |
1148 | /* |
1149 | * Notify @blk's attached device model of a media eject request. | |
1150 | * If @force is true, the medium is about to be yanked out forcefully. | |
1151 | */ | |
1152 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1153 | { |
b4ad82aa | 1154 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1155 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1156 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1157 | } | |
4be74634 MA |
1158 | } |
1159 | ||
a7f53e26 MA |
1160 | /* |
1161 | * Does @blk's attached device model have a tray, and is it open? | |
1162 | */ | |
1163 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1164 | { |
967d7905 | 1165 | IO_CODE(); |
8f3a73bc | 1166 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1167 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1168 | } | |
1169 | return false; | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * Does @blk's attached device model have the medium locked? | |
1174 | * %false if the device model has no such lock. | |
1175 | */ | |
1176 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1177 | { | |
b4ad82aa | 1178 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1179 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { |
1180 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1181 | } | |
1182 | return false; | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * Notify @blk's attached device model of a backend size change. | |
1187 | */ | |
5c8cab48 | 1188 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1189 | { |
5c8cab48 KW |
1190 | BlockBackend *blk = child->opaque; |
1191 | ||
a7f53e26 MA |
1192 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1193 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | void blk_iostatus_enable(BlockBackend *blk) | |
1198 | { | |
0439c5a4 | 1199 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1200 | blk->iostatus_enabled = true; |
1201 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1202 | } | |
1203 | ||
1204 | /* The I/O status is only enabled if the drive explicitly | |
1205 | * enables it _and_ the VM is configured to stop on errors */ | |
1206 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1207 | { | |
37868b2a | 1208 | IO_CODE(); |
373340b2 HR |
1209 | return (blk->iostatus_enabled && |
1210 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1211 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1212 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1213 | } | |
1214 | ||
1215 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1216 | { | |
0439c5a4 | 1217 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1218 | return blk->iostatus; |
1219 | } | |
1220 | ||
1221 | void blk_iostatus_disable(BlockBackend *blk) | |
1222 | { | |
0439c5a4 | 1223 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1224 | blk->iostatus_enabled = false; |
1225 | } | |
1226 | ||
1227 | void blk_iostatus_reset(BlockBackend *blk) | |
1228 | { | |
0439c5a4 | 1229 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1230 | if (blk_iostatus_is_enabled(blk)) { |
1231 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
373340b2 HR |
1232 | } |
1233 | } | |
1234 | ||
1235 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1236 | { | |
37868b2a | 1237 | IO_CODE(); |
373340b2 HR |
1238 | assert(blk_iostatus_is_enabled(blk)); |
1239 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1240 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1241 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1242 | } | |
4be74634 MA |
1243 | } |
1244 | ||
c10c9d96 KW |
1245 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1246 | { | |
37868b2a | 1247 | IO_CODE(); |
c10c9d96 KW |
1248 | blk->allow_write_beyond_eof = allow; |
1249 | } | |
1250 | ||
980b0f94 KW |
1251 | void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow) |
1252 | { | |
37868b2a | 1253 | IO_CODE(); |
980b0f94 KW |
1254 | blk->allow_aio_context_change = allow; |
1255 | } | |
1256 | ||
cf312932 KW |
1257 | void blk_set_disable_request_queuing(BlockBackend *blk, bool disable) |
1258 | { | |
37868b2a | 1259 | IO_CODE(); |
ef80ec50 | 1260 | qatomic_set(&blk->disable_request_queuing, disable); |
cf312932 KW |
1261 | } |
1262 | ||
c73ff92c EGE |
1263 | static int coroutine_fn GRAPH_RDLOCK |
1264 | blk_check_byte_request(BlockBackend *blk, int64_t offset, int64_t bytes) | |
e7f7d676 HR |
1265 | { |
1266 | int64_t len; | |
1267 | ||
aa78b825 | 1268 | if (bytes < 0) { |
e7f7d676 HR |
1269 | return -EIO; |
1270 | } | |
1271 | ||
c73ff92c | 1272 | if (!blk_co_is_available(blk)) { |
e7f7d676 HR |
1273 | return -ENOMEDIUM; |
1274 | } | |
1275 | ||
e7f7d676 HR |
1276 | if (offset < 0) { |
1277 | return -EIO; | |
1278 | } | |
1279 | ||
c10c9d96 | 1280 | if (!blk->allow_write_beyond_eof) { |
bd53086e | 1281 | len = bdrv_co_getlength(blk_bs(blk)); |
c10c9d96 KW |
1282 | if (len < 0) { |
1283 | return len; | |
1284 | } | |
1285 | ||
7242db63 | 1286 | if (offset > len || len - offset < bytes) { |
c10c9d96 KW |
1287 | return -EIO; |
1288 | } | |
e7f7d676 HR |
1289 | } |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
ff82b783 SH |
1294 | /* Are we currently in a drained section? */ |
1295 | bool blk_in_drain(BlockBackend *blk) | |
1296 | { | |
1297 | GLOBAL_STATE_CODE(); /* change to IO_OR_GS_CODE(), if necessary */ | |
1298 | return qatomic_read(&blk->quiesce_counter); | |
1299 | } | |
1300 | ||
7f16476f | 1301 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
cf312932 KW |
1302 | static void coroutine_fn blk_wait_while_drained(BlockBackend *blk) |
1303 | { | |
7f16476f KW |
1304 | assert(blk->in_flight > 0); |
1305 | ||
ef80ec50 SH |
1306 | if (qatomic_read(&blk->quiesce_counter) && |
1307 | !qatomic_read(&blk->disable_request_queuing)) { | |
407ae2ae SH |
1308 | /* |
1309 | * Take lock before decrementing in flight counter so main loop thread | |
1310 | * waits for us to enqueue ourselves before it can leave the drained | |
1311 | * section. | |
1312 | */ | |
1313 | qemu_mutex_lock(&blk->queued_requests_lock); | |
7f16476f | 1314 | blk_dec_in_flight(blk); |
407ae2ae | 1315 | qemu_co_queue_wait(&blk->queued_requests, &blk->queued_requests_lock); |
7f16476f | 1316 | blk_inc_in_flight(blk); |
407ae2ae | 1317 | qemu_mutex_unlock(&blk->queued_requests_lock); |
cf312932 KW |
1318 | } |
1319 | } | |
1320 | ||
fbb92b67 | 1321 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
d1d3fc3d AF |
1322 | static int coroutine_fn |
1323 | blk_co_do_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, | |
1324 | QEMUIOVector *qiov, size_t qiov_offset, | |
1325 | BdrvRequestFlags flags) | |
4be74634 | 1326 | { |
1e98fefd | 1327 | int ret; |
cf312932 | 1328 | BlockDriverState *bs; |
1581a70d | 1329 | IO_CODE(); |
1e98fefd | 1330 | |
cf312932 | 1331 | blk_wait_while_drained(blk); |
b9b10c35 | 1332 | GRAPH_RDLOCK_GUARD(); |
1e98fefd | 1333 | |
cf312932 KW |
1334 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1335 | bs = blk_bs(blk); | |
99723548 | 1336 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1337 | |
1338 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1339 | if (ret < 0) { |
1340 | return ret; | |
1341 | } | |
1342 | ||
99723548 PB |
1343 | bdrv_inc_in_flight(bs); |
1344 | ||
441565b2 | 1345 | /* throttling disk I/O */ |
022cdc9f MP |
1346 | if (blk->public.throttle_group_member.throttle_state) { |
1347 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
3b2337ef | 1348 | bytes, THROTTLE_READ); |
441565b2 KW |
1349 | } |
1350 | ||
d1d3fc3d AF |
1351 | ret = bdrv_co_preadv_part(blk->root, offset, bytes, qiov, qiov_offset, |
1352 | flags); | |
99723548 PB |
1353 | bdrv_dec_in_flight(bs); |
1354 | return ret; | |
1bf1cbc9 KW |
1355 | } |
1356 | ||
6f675c93 AF |
1357 | int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset, int64_t bytes, |
1358 | void *buf, BdrvRequestFlags flags) | |
1359 | { | |
1360 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1361 | IO_OR_GS_CODE(); | |
1362 | ||
1363 | assert(bytes <= SIZE_MAX); | |
1364 | ||
1365 | return blk_co_preadv(blk, offset, bytes, &qiov, flags); | |
1366 | } | |
1367 | ||
fbb92b67 | 1368 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
95479077 | 1369 | int64_t bytes, QEMUIOVector *qiov, |
fbb92b67 KW |
1370 | BdrvRequestFlags flags) |
1371 | { | |
1372 | int ret; | |
37868b2a | 1373 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1374 | |
1375 | blk_inc_in_flight(blk); | |
d1d3fc3d AF |
1376 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, 0, flags); |
1377 | blk_dec_in_flight(blk); | |
1378 | ||
1379 | return ret; | |
1380 | } | |
1381 | ||
1382 | int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset, | |
1383 | int64_t bytes, QEMUIOVector *qiov, | |
1384 | size_t qiov_offset, BdrvRequestFlags flags) | |
1385 | { | |
1386 | int ret; | |
1387 | IO_OR_GS_CODE(); | |
1388 | ||
1389 | blk_inc_in_flight(blk); | |
1390 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, qiov_offset, flags); | |
fbb92b67 KW |
1391 | blk_dec_in_flight(blk); |
1392 | ||
1393 | return ret; | |
1394 | } | |
1395 | ||
1396 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ | |
07a64aa4 | 1397 | static int coroutine_fn |
70e8775e VSO |
1398 | blk_co_do_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, |
1399 | QEMUIOVector *qiov, size_t qiov_offset, | |
1400 | BdrvRequestFlags flags) | |
a8823a3b | 1401 | { |
bfd18d1e | 1402 | int ret; |
cf312932 | 1403 | BlockDriverState *bs; |
1581a70d | 1404 | IO_CODE(); |
bfd18d1e | 1405 | |
cf312932 | 1406 | blk_wait_while_drained(blk); |
b9b10c35 | 1407 | GRAPH_RDLOCK_GUARD(); |
bfd18d1e | 1408 | |
cf312932 KW |
1409 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1410 | bs = blk_bs(blk); | |
99723548 | 1411 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1412 | |
bfd18d1e | 1413 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1414 | if (ret < 0) { |
1415 | return ret; | |
1416 | } | |
1417 | ||
99723548 | 1418 | bdrv_inc_in_flight(bs); |
441565b2 | 1419 | /* throttling disk I/O */ |
022cdc9f MP |
1420 | if (blk->public.throttle_group_member.throttle_state) { |
1421 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
3b2337ef | 1422 | bytes, THROTTLE_WRITE); |
441565b2 KW |
1423 | } |
1424 | ||
bfd18d1e KW |
1425 | if (!blk->enable_write_cache) { |
1426 | flags |= BDRV_REQ_FUA; | |
1427 | } | |
1428 | ||
b3016864 VSO |
1429 | ret = bdrv_co_pwritev_part(blk->root, offset, bytes, qiov, qiov_offset, |
1430 | flags); | |
99723548 PB |
1431 | bdrv_dec_in_flight(bs); |
1432 | return ret; | |
a8823a3b KW |
1433 | } |
1434 | ||
fbb92b67 | 1435 | int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset, |
34460feb | 1436 | int64_t bytes, |
fbb92b67 KW |
1437 | QEMUIOVector *qiov, size_t qiov_offset, |
1438 | BdrvRequestFlags flags) | |
1439 | { | |
1440 | int ret; | |
37868b2a | 1441 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1442 | |
1443 | blk_inc_in_flight(blk); | |
70e8775e | 1444 | ret = blk_co_do_pwritev_part(blk, offset, bytes, qiov, qiov_offset, flags); |
fbb92b67 KW |
1445 | blk_dec_in_flight(blk); |
1446 | ||
1447 | return ret; | |
1448 | } | |
1449 | ||
6f675c93 AF |
1450 | int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes, |
1451 | const void *buf, BdrvRequestFlags flags) | |
1452 | { | |
1453 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1454 | IO_OR_GS_CODE(); | |
1455 | ||
1456 | assert(bytes <= SIZE_MAX); | |
1457 | ||
1458 | return blk_co_pwritev(blk, offset, bytes, &qiov, flags); | |
1459 | } | |
1460 | ||
b3016864 | 1461 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
34460feb | 1462 | int64_t bytes, QEMUIOVector *qiov, |
b3016864 VSO |
1463 | BdrvRequestFlags flags) |
1464 | { | |
37868b2a | 1465 | IO_OR_GS_CODE(); |
b3016864 VSO |
1466 | return blk_co_pwritev_part(blk, offset, bytes, qiov, 0, flags); |
1467 | } | |
1468 | ||
ff7e261b EGE |
1469 | int coroutine_fn blk_co_block_status_above(BlockBackend *blk, |
1470 | BlockDriverState *base, | |
1471 | int64_t offset, int64_t bytes, | |
1472 | int64_t *pnum, int64_t *map, | |
1473 | BlockDriverState **file) | |
1474 | { | |
1475 | IO_CODE(); | |
7ff9579e | 1476 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1477 | return bdrv_co_block_status_above(blk_bs(blk), base, offset, bytes, pnum, |
1478 | map, file); | |
1479 | } | |
1480 | ||
1481 | int coroutine_fn blk_co_is_allocated_above(BlockBackend *blk, | |
1482 | BlockDriverState *base, | |
1483 | bool include_base, int64_t offset, | |
1484 | int64_t bytes, int64_t *pnum) | |
1485 | { | |
1486 | IO_CODE(); | |
7ff9579e | 1487 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1488 | return bdrv_co_is_allocated_above(blk_bs(blk), base, include_base, offset, |
1489 | bytes, pnum); | |
1490 | } | |
1491 | ||
1bf1cbc9 KW |
1492 | typedef struct BlkRwCo { |
1493 | BlockBackend *blk; | |
1494 | int64_t offset; | |
c060332c | 1495 | void *iobuf; |
1bf1cbc9 KW |
1496 | int ret; |
1497 | BdrvRequestFlags flags; | |
1498 | } BlkRwCo; | |
1499 | ||
720ff280 KW |
1500 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1501 | { | |
0439c5a4 | 1502 | GLOBAL_STATE_CODE(); |
720ff280 KW |
1503 | return bdrv_make_zero(blk->root, flags); |
1504 | } | |
1505 | ||
c90e2a9c | 1506 | void blk_inc_in_flight(BlockBackend *blk) |
33f2a757 | 1507 | { |
37868b2a | 1508 | IO_CODE(); |
d73415a3 | 1509 | qatomic_inc(&blk->in_flight); |
33f2a757 SH |
1510 | } |
1511 | ||
c90e2a9c | 1512 | void blk_dec_in_flight(BlockBackend *blk) |
33f2a757 | 1513 | { |
37868b2a | 1514 | IO_CODE(); |
d73415a3 | 1515 | qatomic_dec(&blk->in_flight); |
cfe29d82 | 1516 | aio_wait_kick(); |
33f2a757 SH |
1517 | } |
1518 | ||
e7f7d676 HR |
1519 | static void error_callback_bh(void *opaque) |
1520 | { | |
1521 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1522 | |
33f2a757 | 1523 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1524 | acb->common.cb(acb->common.opaque, acb->ret); |
1525 | qemu_aio_unref(acb); | |
1526 | } | |
1527 | ||
ca78ecfa PL |
1528 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1529 | BlockCompletionFunc *cb, | |
1530 | void *opaque, int ret) | |
e7f7d676 HR |
1531 | { |
1532 | struct BlockBackendAIOCB *acb; | |
37868b2a | 1533 | IO_CODE(); |
e7f7d676 | 1534 | |
33f2a757 | 1535 | blk_inc_in_flight(blk); |
e7f7d676 | 1536 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1537 | acb->blk = blk; |
e7f7d676 HR |
1538 | acb->ret = ret; |
1539 | ||
46eb6e86 | 1540 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
e4ec5ad4 | 1541 | error_callback_bh, acb); |
e7f7d676 HR |
1542 | return &acb->common; |
1543 | } | |
1544 | ||
57d6a428 KW |
1545 | typedef struct BlkAioEmAIOCB { |
1546 | BlockAIOCB common; | |
1547 | BlkRwCo rwco; | |
a93d81c8 | 1548 | int64_t bytes; |
57d6a428 | 1549 | bool has_returned; |
57d6a428 KW |
1550 | } BlkAioEmAIOCB; |
1551 | ||
1552 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1553 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1554 | }; | |
1555 | ||
1556 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1557 | { | |
57d6a428 KW |
1558 | if (acb->has_returned) { |
1559 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1560 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1561 | qemu_aio_unref(acb); |
1562 | } | |
1563 | } | |
1564 | ||
1565 | static void blk_aio_complete_bh(void *opaque) | |
1566 | { | |
fffb6e12 | 1567 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1568 | assert(acb->has_returned); |
1569 | blk_aio_complete(acb); | |
57d6a428 KW |
1570 | } |
1571 | ||
a93d81c8 VSO |
1572 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, |
1573 | int64_t bytes, | |
c060332c | 1574 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1575 | BdrvRequestFlags flags, |
1576 | BlockCompletionFunc *cb, void *opaque) | |
1577 | { | |
1578 | BlkAioEmAIOCB *acb; | |
1579 | Coroutine *co; | |
1580 | ||
33f2a757 | 1581 | blk_inc_in_flight(blk); |
57d6a428 KW |
1582 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1583 | acb->rwco = (BlkRwCo) { | |
1584 | .blk = blk, | |
1585 | .offset = offset, | |
c060332c | 1586 | .iobuf = iobuf, |
57d6a428 KW |
1587 | .flags = flags, |
1588 | .ret = NOT_DONE, | |
1589 | }; | |
7fa84cd8 | 1590 | acb->bytes = bytes; |
57d6a428 KW |
1591 | acb->has_returned = false; |
1592 | ||
0b8b8753 | 1593 | co = qemu_coroutine_create(co_entry, acb); |
46eb6e86 | 1594 | aio_co_enter(qemu_get_current_aio_context(), co); |
57d6a428 KW |
1595 | |
1596 | acb->has_returned = true; | |
1597 | if (acb->rwco.ret != NOT_DONE) { | |
46eb6e86 | 1598 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
e4ec5ad4 | 1599 | blk_aio_complete_bh, acb); |
57d6a428 KW |
1600 | } |
1601 | ||
1602 | return &acb->common; | |
1603 | } | |
1604 | ||
881a4c55 | 1605 | static void coroutine_fn blk_aio_read_entry(void *opaque) |
57d6a428 KW |
1606 | { |
1607 | BlkAioEmAIOCB *acb = opaque; | |
1608 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1609 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1610 | |
c060332c | 1611 | assert(qiov->size == acb->bytes); |
d1d3fc3d AF |
1612 | rwco->ret = blk_co_do_preadv_part(rwco->blk, rwco->offset, acb->bytes, qiov, |
1613 | 0, rwco->flags); | |
57d6a428 KW |
1614 | blk_aio_complete(acb); |
1615 | } | |
1616 | ||
881a4c55 | 1617 | static void coroutine_fn blk_aio_write_entry(void *opaque) |
57d6a428 KW |
1618 | { |
1619 | BlkAioEmAIOCB *acb = opaque; | |
1620 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1621 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1622 | |
c060332c | 1623 | assert(!qiov || qiov->size == acb->bytes); |
70e8775e VSO |
1624 | rwco->ret = blk_co_do_pwritev_part(rwco->blk, rwco->offset, acb->bytes, |
1625 | qiov, 0, rwco->flags); | |
57d6a428 KW |
1626 | blk_aio_complete(acb); |
1627 | } | |
1628 | ||
d004bd52 | 1629 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
a93d81c8 | 1630 | int64_t bytes, BdrvRequestFlags flags, |
d004bd52 | 1631 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1632 | { |
37868b2a | 1633 | IO_CODE(); |
a93d81c8 | 1634 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_write_entry, |
983a1600 | 1635 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); |
4be74634 MA |
1636 | } |
1637 | ||
c86422c5 | 1638 | int64_t coroutine_fn blk_co_getlength(BlockBackend *blk) |
4be74634 | 1639 | { |
37868b2a | 1640 | IO_CODE(); |
c73ff92c | 1641 | GRAPH_RDLOCK_GUARD(); |
c86422c5 | 1642 | |
c73ff92c | 1643 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1644 | return -ENOMEDIUM; |
1645 | } | |
1646 | ||
c86422c5 | 1647 | return bdrv_co_getlength(blk_bs(blk)); |
4be74634 MA |
1648 | } |
1649 | ||
9ed98cae | 1650 | int64_t coroutine_fn blk_co_nb_sectors(BlockBackend *blk) |
4be74634 | 1651 | { |
e5203a3b PB |
1652 | BlockDriverState *bs = blk_bs(blk); |
1653 | ||
37868b2a | 1654 | IO_CODE(); |
d8fbf9aa KW |
1655 | GRAPH_RDLOCK_GUARD(); |
1656 | ||
e5203a3b | 1657 | if (!bs) { |
9ed98cae | 1658 | return -ENOMEDIUM; |
a46fc9c9 | 1659 | } else { |
9ed98cae | 1660 | return bdrv_co_nb_sectors(bs); |
a46fc9c9 | 1661 | } |
4be74634 MA |
1662 | } |
1663 | ||
81f730d4 PB |
1664 | /* |
1665 | * This wrapper is written by hand because this function is in the hot I/O path, | |
1666 | * via blk_get_geometry. | |
1667 | */ | |
1668 | int64_t coroutine_mixed_fn blk_nb_sectors(BlockBackend *blk) | |
1669 | { | |
1670 | BlockDriverState *bs = blk_bs(blk); | |
1671 | ||
1672 | IO_CODE(); | |
1673 | ||
1674 | if (!bs) { | |
1675 | return -ENOMEDIUM; | |
1676 | } else { | |
1677 | return bdrv_nb_sectors(bs); | |
1678 | } | |
1679 | } | |
1680 | ||
9ed98cae PB |
1681 | /* return 0 as number of sectors if no device present or error */ |
1682 | void coroutine_fn blk_co_get_geometry(BlockBackend *blk, | |
1683 | uint64_t *nb_sectors_ptr) | |
1ef01253 | 1684 | { |
9ed98cae PB |
1685 | int64_t ret = blk_co_nb_sectors(blk); |
1686 | *nb_sectors_ptr = ret < 0 ? 0 : ret; | |
1ef01253 HR |
1687 | } |
1688 | ||
81f730d4 PB |
1689 | /* |
1690 | * This wrapper is written by hand because this function is in the hot I/O path. | |
1691 | */ | |
1692 | void coroutine_mixed_fn blk_get_geometry(BlockBackend *blk, | |
1693 | uint64_t *nb_sectors_ptr) | |
1694 | { | |
1695 | int64_t ret = blk_nb_sectors(blk); | |
1696 | *nb_sectors_ptr = ret < 0 ? 0 : ret; | |
1697 | } | |
1698 | ||
60cb2fa7 EB |
1699 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1700 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1701 | BlockCompletionFunc *cb, void *opaque) | |
1702 | { | |
37868b2a | 1703 | IO_CODE(); |
a93d81c8 | 1704 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1705 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1706 | blk_aio_read_entry, flags, cb, opaque); | |
1707 | } | |
1708 | ||
60cb2fa7 EB |
1709 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1710 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1711 | BlockCompletionFunc *cb, void *opaque) | |
1712 | { | |
37868b2a | 1713 | IO_CODE(); |
73d4a113 | 1714 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1715 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1716 | blk_aio_write_entry, flags, cb, opaque); | |
1717 | } | |
1718 | ||
4be74634 MA |
1719 | void blk_aio_cancel(BlockAIOCB *acb) |
1720 | { | |
0439c5a4 | 1721 | GLOBAL_STATE_CODE(); |
4be74634 MA |
1722 | bdrv_aio_cancel(acb); |
1723 | } | |
1724 | ||
1725 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1726 | { | |
37868b2a | 1727 | IO_CODE(); |
4be74634 MA |
1728 | bdrv_aio_cancel_async(acb); |
1729 | } | |
1730 | ||
fbb92b67 | 1731 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
df02da00 | 1732 | static int coroutine_fn |
70e8775e | 1733 | blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1734 | { |
1581a70d EGE |
1735 | IO_CODE(); |
1736 | ||
cf312932 | 1737 | blk_wait_while_drained(blk); |
26c518ab | 1738 | GRAPH_RDLOCK_GUARD(); |
cf312932 | 1739 | |
c73ff92c | 1740 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1741 | return -ENOMEDIUM; |
1742 | } | |
1743 | ||
48af776a KW |
1744 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1745 | } | |
1746 | ||
df02da00 AF |
1747 | int coroutine_fn blk_co_ioctl(BlockBackend *blk, unsigned long int req, |
1748 | void *buf) | |
48af776a | 1749 | { |
16d36e29 | 1750 | int ret; |
37868b2a | 1751 | IO_OR_GS_CODE(); |
c060332c | 1752 | |
16d36e29 | 1753 | blk_inc_in_flight(blk); |
df02da00 | 1754 | ret = blk_co_do_ioctl(blk, req, buf); |
16d36e29 | 1755 | blk_dec_in_flight(blk); |
48af776a | 1756 | |
16d36e29 | 1757 | return ret; |
48af776a KW |
1758 | } |
1759 | ||
881a4c55 | 1760 | static void coroutine_fn blk_aio_ioctl_entry(void *opaque) |
48af776a KW |
1761 | { |
1762 | BlkAioEmAIOCB *acb = opaque; | |
1763 | BlkRwCo *rwco = &acb->rwco; | |
1764 | ||
70e8775e | 1765 | rwco->ret = blk_co_do_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
c060332c | 1766 | |
48af776a | 1767 | blk_aio_complete(acb); |
4be74634 MA |
1768 | } |
1769 | ||
1770 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1771 | BlockCompletionFunc *cb, void *opaque) | |
1772 | { | |
37868b2a | 1773 | IO_CODE(); |
c060332c | 1774 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1775 | } |
1776 | ||
fbb92b67 | 1777 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1778 | static int coroutine_fn |
70e8775e | 1779 | blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes) |
2bb0dce7 | 1780 | { |
cf312932 | 1781 | int ret; |
1581a70d | 1782 | IO_CODE(); |
cf312932 KW |
1783 | |
1784 | blk_wait_while_drained(blk); | |
9a5a1c62 | 1785 | GRAPH_RDLOCK_GUARD(); |
cf312932 KW |
1786 | |
1787 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1788 | if (ret < 0) { |
1789 | return ret; | |
1790 | } | |
1791 | ||
0b9fd3f4 | 1792 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1793 | } |
1794 | ||
881a4c55 | 1795 | static void coroutine_fn blk_aio_pdiscard_entry(void *opaque) |
564806c5 KW |
1796 | { |
1797 | BlkAioEmAIOCB *acb = opaque; | |
1798 | BlkRwCo *rwco = &acb->rwco; | |
1799 | ||
70e8775e | 1800 | rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes); |
564806c5 KW |
1801 | blk_aio_complete(acb); |
1802 | } | |
1803 | ||
1804 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, | |
a93d81c8 | 1805 | int64_t offset, int64_t bytes, |
564806c5 KW |
1806 | BlockCompletionFunc *cb, void *opaque) |
1807 | { | |
37868b2a | 1808 | IO_CODE(); |
564806c5 KW |
1809 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
1810 | cb, opaque); | |
1811 | } | |
1812 | ||
2800637a VSO |
1813 | int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset, |
1814 | int64_t bytes) | |
fbb92b67 KW |
1815 | { |
1816 | int ret; | |
37868b2a | 1817 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1818 | |
1819 | blk_inc_in_flight(blk); | |
70e8775e | 1820 | ret = blk_co_do_pdiscard(blk, offset, bytes); |
fbb92b67 KW |
1821 | blk_dec_in_flight(blk); |
1822 | ||
1823 | return ret; | |
1824 | } | |
1825 | ||
fbb92b67 | 1826 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1827 | static int coroutine_fn blk_co_do_flush(BlockBackend *blk) |
2bb0dce7 | 1828 | { |
1581a70d | 1829 | IO_CODE(); |
88095349 EGE |
1830 | blk_wait_while_drained(blk); |
1831 | GRAPH_RDLOCK_GUARD(); | |
cf312932 | 1832 | |
c73ff92c | 1833 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1834 | return -ENOMEDIUM; |
1835 | } | |
1836 | ||
f21d96d0 | 1837 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1838 | } |
1839 | ||
881a4c55 | 1840 | static void coroutine_fn blk_aio_flush_entry(void *opaque) |
564806c5 KW |
1841 | { |
1842 | BlkAioEmAIOCB *acb = opaque; | |
1843 | BlkRwCo *rwco = &acb->rwco; | |
1844 | ||
70e8775e | 1845 | rwco->ret = blk_co_do_flush(rwco->blk); |
564806c5 KW |
1846 | blk_aio_complete(acb); |
1847 | } | |
1848 | ||
1849 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
1850 | BlockCompletionFunc *cb, void *opaque) | |
1851 | { | |
37868b2a | 1852 | IO_CODE(); |
564806c5 KW |
1853 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
1854 | } | |
1855 | ||
fbb92b67 KW |
1856 | int coroutine_fn blk_co_flush(BlockBackend *blk) |
1857 | { | |
1858 | int ret; | |
37868b2a | 1859 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1860 | |
1861 | blk_inc_in_flight(blk); | |
70e8775e | 1862 | ret = blk_co_do_flush(blk); |
fbb92b67 KW |
1863 | blk_dec_in_flight(blk); |
1864 | ||
1865 | return ret; | |
1866 | } | |
1867 | ||
6d43eaa3 SL |
1868 | static void coroutine_fn blk_aio_zone_report_entry(void *opaque) |
1869 | { | |
1870 | BlkAioEmAIOCB *acb = opaque; | |
1871 | BlkRwCo *rwco = &acb->rwco; | |
1872 | ||
1873 | rwco->ret = blk_co_zone_report(rwco->blk, rwco->offset, | |
1874 | (unsigned int*)(uintptr_t)acb->bytes, | |
1875 | rwco->iobuf); | |
1876 | blk_aio_complete(acb); | |
1877 | } | |
1878 | ||
1879 | BlockAIOCB *blk_aio_zone_report(BlockBackend *blk, int64_t offset, | |
1880 | unsigned int *nr_zones, | |
1881 | BlockZoneDescriptor *zones, | |
1882 | BlockCompletionFunc *cb, void *opaque) | |
1883 | { | |
1884 | BlkAioEmAIOCB *acb; | |
1885 | Coroutine *co; | |
1886 | IO_CODE(); | |
1887 | ||
1888 | blk_inc_in_flight(blk); | |
1889 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1890 | acb->rwco = (BlkRwCo) { | |
1891 | .blk = blk, | |
1892 | .offset = offset, | |
1893 | .iobuf = zones, | |
1894 | .ret = NOT_DONE, | |
1895 | }; | |
1896 | acb->bytes = (int64_t)(uintptr_t)nr_zones, | |
1897 | acb->has_returned = false; | |
1898 | ||
1899 | co = qemu_coroutine_create(blk_aio_zone_report_entry, acb); | |
0f86afde | 1900 | aio_co_enter(qemu_get_current_aio_context(), co); |
6d43eaa3 SL |
1901 | |
1902 | acb->has_returned = true; | |
1903 | if (acb->rwco.ret != NOT_DONE) { | |
0f86afde | 1904 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
6d43eaa3 SL |
1905 | blk_aio_complete_bh, acb); |
1906 | } | |
1907 | ||
1908 | return &acb->common; | |
1909 | } | |
1910 | ||
1911 | static void coroutine_fn blk_aio_zone_mgmt_entry(void *opaque) | |
1912 | { | |
1913 | BlkAioEmAIOCB *acb = opaque; | |
1914 | BlkRwCo *rwco = &acb->rwco; | |
1915 | ||
1916 | rwco->ret = blk_co_zone_mgmt(rwco->blk, | |
1917 | (BlockZoneOp)(uintptr_t)rwco->iobuf, | |
1918 | rwco->offset, acb->bytes); | |
1919 | blk_aio_complete(acb); | |
1920 | } | |
1921 | ||
1922 | BlockAIOCB *blk_aio_zone_mgmt(BlockBackend *blk, BlockZoneOp op, | |
1923 | int64_t offset, int64_t len, | |
1924 | BlockCompletionFunc *cb, void *opaque) { | |
1925 | BlkAioEmAIOCB *acb; | |
1926 | Coroutine *co; | |
1927 | IO_CODE(); | |
1928 | ||
1929 | blk_inc_in_flight(blk); | |
1930 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1931 | acb->rwco = (BlkRwCo) { | |
1932 | .blk = blk, | |
1933 | .offset = offset, | |
1934 | .iobuf = (void *)(uintptr_t)op, | |
1935 | .ret = NOT_DONE, | |
1936 | }; | |
1937 | acb->bytes = len; | |
1938 | acb->has_returned = false; | |
1939 | ||
1940 | co = qemu_coroutine_create(blk_aio_zone_mgmt_entry, acb); | |
0f86afde | 1941 | aio_co_enter(qemu_get_current_aio_context(), co); |
6d43eaa3 SL |
1942 | |
1943 | acb->has_returned = true; | |
1944 | if (acb->rwco.ret != NOT_DONE) { | |
0f86afde | 1945 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
6d43eaa3 SL |
1946 | blk_aio_complete_bh, acb); |
1947 | } | |
1948 | ||
1949 | return &acb->common; | |
1950 | } | |
1951 | ||
4751d09a SL |
1952 | static void coroutine_fn blk_aio_zone_append_entry(void *opaque) |
1953 | { | |
1954 | BlkAioEmAIOCB *acb = opaque; | |
1955 | BlkRwCo *rwco = &acb->rwco; | |
1956 | ||
1957 | rwco->ret = blk_co_zone_append(rwco->blk, (int64_t *)(uintptr_t)acb->bytes, | |
1958 | rwco->iobuf, rwco->flags); | |
1959 | blk_aio_complete(acb); | |
1960 | } | |
1961 | ||
1962 | BlockAIOCB *blk_aio_zone_append(BlockBackend *blk, int64_t *offset, | |
1963 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1964 | BlockCompletionFunc *cb, void *opaque) { | |
1965 | BlkAioEmAIOCB *acb; | |
1966 | Coroutine *co; | |
1967 | IO_CODE(); | |
1968 | ||
1969 | blk_inc_in_flight(blk); | |
1970 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1971 | acb->rwco = (BlkRwCo) { | |
1972 | .blk = blk, | |
1973 | .ret = NOT_DONE, | |
1974 | .flags = flags, | |
1975 | .iobuf = qiov, | |
1976 | }; | |
1977 | acb->bytes = (int64_t)(uintptr_t)offset; | |
1978 | acb->has_returned = false; | |
1979 | ||
1980 | co = qemu_coroutine_create(blk_aio_zone_append_entry, acb); | |
0f86afde | 1981 | aio_co_enter(qemu_get_current_aio_context(), co); |
4751d09a SL |
1982 | acb->has_returned = true; |
1983 | if (acb->rwco.ret != NOT_DONE) { | |
0f86afde | 1984 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
4751d09a SL |
1985 | blk_aio_complete_bh, acb); |
1986 | } | |
1987 | ||
1988 | return &acb->common; | |
1989 | } | |
1990 | ||
6d43eaa3 SL |
1991 | /* |
1992 | * Send a zone_report command. | |
1993 | * offset is a byte offset from the start of the device. No alignment | |
1994 | * required for offset. | |
1995 | * nr_zones represents IN maximum and OUT actual. | |
1996 | */ | |
1997 | int coroutine_fn blk_co_zone_report(BlockBackend *blk, int64_t offset, | |
1998 | unsigned int *nr_zones, | |
1999 | BlockZoneDescriptor *zones) | |
2000 | { | |
2001 | int ret; | |
2002 | IO_CODE(); | |
2003 | ||
2004 | blk_inc_in_flight(blk); /* increase before waiting */ | |
2005 | blk_wait_while_drained(blk); | |
2006 | GRAPH_RDLOCK_GUARD(); | |
2007 | if (!blk_is_available(blk)) { | |
2008 | blk_dec_in_flight(blk); | |
2009 | return -ENOMEDIUM; | |
2010 | } | |
2011 | ret = bdrv_co_zone_report(blk_bs(blk), offset, nr_zones, zones); | |
2012 | blk_dec_in_flight(blk); | |
2013 | return ret; | |
2014 | } | |
2015 | ||
2016 | /* | |
2017 | * Send a zone_management command. | |
2018 | * op is the zone operation; | |
2019 | * offset is the byte offset from the start of the zoned device; | |
2020 | * len is the maximum number of bytes the command should operate on. It | |
2021 | * should be aligned with the device zone size. | |
2022 | */ | |
2023 | int coroutine_fn blk_co_zone_mgmt(BlockBackend *blk, BlockZoneOp op, | |
2024 | int64_t offset, int64_t len) | |
2025 | { | |
2026 | int ret; | |
2027 | IO_CODE(); | |
2028 | ||
2029 | blk_inc_in_flight(blk); | |
2030 | blk_wait_while_drained(blk); | |
2031 | GRAPH_RDLOCK_GUARD(); | |
2032 | ||
2033 | ret = blk_check_byte_request(blk, offset, len); | |
2034 | if (ret < 0) { | |
2035 | blk_dec_in_flight(blk); | |
2036 | return ret; | |
2037 | } | |
2038 | ||
2039 | ret = bdrv_co_zone_mgmt(blk_bs(blk), op, offset, len); | |
2040 | blk_dec_in_flight(blk); | |
2041 | return ret; | |
2042 | } | |
2043 | ||
4751d09a SL |
2044 | /* |
2045 | * Send a zone_append command. | |
2046 | */ | |
2047 | int coroutine_fn blk_co_zone_append(BlockBackend *blk, int64_t *offset, | |
2048 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
2049 | { | |
2050 | int ret; | |
2051 | IO_CODE(); | |
2052 | ||
2053 | blk_inc_in_flight(blk); | |
2054 | blk_wait_while_drained(blk); | |
2055 | GRAPH_RDLOCK_GUARD(); | |
2056 | if (!blk_is_available(blk)) { | |
2057 | blk_dec_in_flight(blk); | |
2058 | return -ENOMEDIUM; | |
2059 | } | |
2060 | ||
2061 | ret = bdrv_co_zone_append(blk_bs(blk), offset, qiov, flags); | |
2062 | blk_dec_in_flight(blk); | |
2063 | return ret; | |
2064 | } | |
2065 | ||
97b0385a AY |
2066 | void blk_drain(BlockBackend *blk) |
2067 | { | |
33f2a757 | 2068 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2069 | GLOBAL_STATE_CODE(); |
33f2a757 SH |
2070 | |
2071 | if (bs) { | |
1e3552db | 2072 | bdrv_ref(bs); |
33f2a757 SH |
2073 | bdrv_drained_begin(bs); |
2074 | } | |
2075 | ||
2076 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 2077 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
6a8a98a0 | 2078 | qatomic_read(&blk->in_flight) > 0); |
33f2a757 SH |
2079 | |
2080 | if (bs) { | |
2081 | bdrv_drained_end(bs); | |
1e3552db | 2082 | bdrv_unref(bs); |
a46fc9c9 | 2083 | } |
97b0385a AY |
2084 | } |
2085 | ||
4be74634 MA |
2086 | void blk_drain_all(void) |
2087 | { | |
33f2a757 SH |
2088 | BlockBackend *blk = NULL; |
2089 | ||
0439c5a4 EGE |
2090 | GLOBAL_STATE_CODE(); |
2091 | ||
33f2a757 SH |
2092 | bdrv_drain_all_begin(); |
2093 | ||
2094 | while ((blk = blk_all_next(blk)) != NULL) { | |
33f2a757 | 2095 | /* We may have -ENOMEDIUM completions in flight */ |
d5eab432 | 2096 | AIO_WAIT_WHILE_UNLOCKED(NULL, qatomic_read(&blk->in_flight) > 0); |
33f2a757 SH |
2097 | } |
2098 | ||
2099 | bdrv_drain_all_end(); | |
4be74634 MA |
2100 | } |
2101 | ||
373340b2 HR |
2102 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
2103 | BlockdevOnError on_write_error) | |
2104 | { | |
0439c5a4 | 2105 | GLOBAL_STATE_CODE(); |
373340b2 HR |
2106 | blk->on_read_error = on_read_error; |
2107 | blk->on_write_error = on_write_error; | |
2108 | } | |
2109 | ||
4be74634 MA |
2110 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
2111 | { | |
37868b2a | 2112 | IO_CODE(); |
373340b2 | 2113 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
2114 | } |
2115 | ||
2116 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
2117 | int error) | |
2118 | { | |
373340b2 | 2119 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
37868b2a | 2120 | IO_CODE(); |
373340b2 HR |
2121 | |
2122 | switch (on_err) { | |
2123 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2124 | return (error == ENOSPC) ? | |
2125 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
2126 | case BLOCKDEV_ON_ERROR_STOP: | |
2127 | return BLOCK_ERROR_ACTION_STOP; | |
2128 | case BLOCKDEV_ON_ERROR_REPORT: | |
2129 | return BLOCK_ERROR_ACTION_REPORT; | |
2130 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2131 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 2132 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
2133 | default: |
2134 | abort(); | |
2135 | } | |
4be74634 MA |
2136 | } |
2137 | ||
373340b2 HR |
2138 | static void send_qmp_error_event(BlockBackend *blk, |
2139 | BlockErrorAction action, | |
2140 | bool is_read, int error) | |
2141 | { | |
2142 | IoOperationType optype; | |
bfe1a14c | 2143 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
2144 | |
2145 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
54fde4ff | 2146 | qapi_event_send_block_io_error(blk_name(blk), |
bfe1a14c | 2147 | bs ? bdrv_get_node_name(bs) : NULL, optype, |
2bf7e10f | 2148 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 2149 | error == ENOSPC, strerror(error)); |
373340b2 HR |
2150 | } |
2151 | ||
2152 | /* This is done by device models because, while the block layer knows | |
2153 | * about the error, it does not know whether an operation comes from | |
2154 | * the device or the block layer (from a job, for example). | |
2155 | */ | |
4be74634 MA |
2156 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
2157 | bool is_read, int error) | |
2158 | { | |
373340b2 | 2159 | assert(error >= 0); |
37868b2a | 2160 | IO_CODE(); |
373340b2 HR |
2161 | |
2162 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
2163 | /* First set the iostatus, so that "info block" returns an iostatus | |
2164 | * that matches the events raised so far (an additional error iostatus | |
2165 | * is fine, but not a lost one). | |
2166 | */ | |
2167 | blk_iostatus_set_err(blk, error); | |
2168 | ||
2169 | /* Then raise the request to stop the VM and the event. | |
2170 | * qemu_system_vmstop_request_prepare has two effects. First, | |
2171 | * it ensures that the STOP event always comes after the | |
2172 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
2173 | * can observe the STOP event and do a "cont" before the STOP | |
2174 | * event is issued, the VM will not stop. In this case, vm_start() | |
2175 | * also ensures that the STOP/RESUME pair of events is emitted. | |
2176 | */ | |
2177 | qemu_system_vmstop_request_prepare(); | |
2178 | send_qmp_error_event(blk, action, is_read, error); | |
2179 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
2180 | } else { | |
2181 | send_qmp_error_event(blk, action, is_read, error); | |
2182 | } | |
4be74634 MA |
2183 | } |
2184 | ||
86b1cf32 KW |
2185 | /* |
2186 | * Returns true if the BlockBackend can support taking write permissions | |
2187 | * (because its root node is not read-only). | |
2188 | */ | |
2189 | bool blk_supports_write_perm(BlockBackend *blk) | |
4be74634 | 2190 | { |
f21d96d0 | 2191 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2192 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2193 | |
2194 | if (bs) { | |
86b1cf32 | 2195 | return !bdrv_is_read_only(bs); |
061959e8 | 2196 | } else { |
260242a8 | 2197 | return blk->root_state.open_flags & BDRV_O_RDWR; |
061959e8 | 2198 | } |
4be74634 MA |
2199 | } |
2200 | ||
86b1cf32 KW |
2201 | /* |
2202 | * Returns true if the BlockBackend can be written to in its current | |
2203 | * configuration (i.e. if write permission have been requested) | |
2204 | */ | |
2205 | bool blk_is_writable(BlockBackend *blk) | |
2206 | { | |
37868b2a | 2207 | IO_CODE(); |
86b1cf32 KW |
2208 | return blk->perm & BLK_PERM_WRITE; |
2209 | } | |
2210 | ||
96710565 | 2211 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 2212 | { |
f21d96d0 | 2213 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2214 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2215 | |
2216 | if (!bs) { | |
96710565 | 2217 | return false; |
a46fc9c9 HR |
2218 | } |
2219 | ||
f21d96d0 | 2220 | return bdrv_is_sg(bs); |
4be74634 MA |
2221 | } |
2222 | ||
96710565 | 2223 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 2224 | { |
37868b2a | 2225 | IO_CODE(); |
bfd18d1e | 2226 | return blk->enable_write_cache; |
4be74634 MA |
2227 | } |
2228 | ||
2229 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
2230 | { | |
be8da05b | 2231 | IO_CODE(); |
bfd18d1e | 2232 | blk->enable_write_cache = wce; |
4be74634 MA |
2233 | } |
2234 | ||
3b717194 | 2235 | void blk_activate(BlockBackend *blk, Error **errp) |
2bb0dce7 | 2236 | { |
f21d96d0 | 2237 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2238 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2239 | |
2240 | if (!bs) { | |
c09ba36c HR |
2241 | error_setg(errp, "Device '%s' has no medium", blk->name); |
2242 | return; | |
2243 | } | |
2244 | ||
da4afaff KW |
2245 | /* |
2246 | * Migration code can call this function in coroutine context, so leave | |
2247 | * coroutine context if necessary. | |
2248 | */ | |
2249 | if (qemu_in_coroutine()) { | |
2250 | bdrv_co_activate(bs, errp); | |
2251 | } else { | |
2b3912f1 | 2252 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
da4afaff KW |
2253 | bdrv_activate(bs, errp); |
2254 | } | |
2bb0dce7 HR |
2255 | } |
2256 | ||
1e97be91 | 2257 | bool coroutine_fn blk_co_is_inserted(BlockBackend *blk) |
4be74634 | 2258 | { |
f21d96d0 | 2259 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2260 | IO_CODE(); |
c73ff92c | 2261 | assert_bdrv_graph_readable(); |
f21d96d0 | 2262 | |
1e97be91 | 2263 | return bs && bdrv_co_is_inserted(bs); |
db0284f8 HR |
2264 | } |
2265 | ||
c73ff92c | 2266 | bool coroutine_fn blk_co_is_available(BlockBackend *blk) |
db0284f8 | 2267 | { |
37868b2a | 2268 | IO_CODE(); |
c73ff92c | 2269 | return blk_co_is_inserted(blk) && !blk_dev_is_tray_open(blk); |
4be74634 MA |
2270 | } |
2271 | ||
2c75261c | 2272 | void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked) |
4be74634 | 2273 | { |
f21d96d0 | 2274 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2275 | IO_CODE(); |
79a292e5 | 2276 | GRAPH_RDLOCK_GUARD(); |
f21d96d0 KW |
2277 | |
2278 | if (bs) { | |
2c75261c | 2279 | bdrv_co_lock_medium(bs, locked); |
a46fc9c9 | 2280 | } |
4be74634 MA |
2281 | } |
2282 | ||
2531b390 | 2283 | void coroutine_fn blk_co_eject(BlockBackend *blk, bool eject_flag) |
4be74634 | 2284 | { |
f21d96d0 | 2285 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 | 2286 | char *id; |
37868b2a | 2287 | IO_CODE(); |
79a292e5 | 2288 | GRAPH_RDLOCK_GUARD(); |
2d76e724 | 2289 | |
f21d96d0 | 2290 | if (bs) { |
2531b390 | 2291 | bdrv_co_eject(bs, eject_flag); |
a46fc9c9 | 2292 | } |
c47ee043 JS |
2293 | |
2294 | /* Whether or not we ejected on the backend, | |
2295 | * the frontend experienced a tray event. */ | |
2296 | id = blk_get_attached_dev_id(blk); | |
2297 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 2298 | eject_flag); |
c47ee043 | 2299 | g_free(id); |
4be74634 MA |
2300 | } |
2301 | ||
2302 | int blk_get_flags(BlockBackend *blk) | |
2303 | { | |
f21d96d0 | 2304 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2305 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2306 | |
2307 | if (bs) { | |
2308 | return bdrv_get_flags(bs); | |
061959e8 HR |
2309 | } else { |
2310 | return blk->root_state.open_flags; | |
2311 | } | |
4be74634 MA |
2312 | } |
2313 | ||
4841211e EB |
2314 | /* Returns the minimum request alignment, in bytes; guaranteed nonzero */ |
2315 | uint32_t blk_get_request_alignment(BlockBackend *blk) | |
2316 | { | |
2317 | BlockDriverState *bs = blk_bs(blk); | |
37868b2a | 2318 | IO_CODE(); |
4841211e EB |
2319 | return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE; |
2320 | } | |
2321 | ||
24b36e98 PB |
2322 | /* Returns the maximum hardware transfer length, in bytes; guaranteed nonzero */ |
2323 | uint64_t blk_get_max_hw_transfer(BlockBackend *blk) | |
2324 | { | |
2325 | BlockDriverState *bs = blk_bs(blk); | |
2326 | uint64_t max = INT_MAX; | |
37868b2a | 2327 | IO_CODE(); |
24b36e98 PB |
2328 | |
2329 | if (bs) { | |
2330 | max = MIN_NON_ZERO(max, bs->bl.max_hw_transfer); | |
2331 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); | |
2332 | } | |
2333 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); | |
2334 | } | |
2335 | ||
5def6b80 EB |
2336 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
2337 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 2338 | { |
f21d96d0 | 2339 | BlockDriverState *bs = blk_bs(blk); |
b99f7fa0 | 2340 | uint32_t max = INT_MAX; |
37868b2a | 2341 | IO_CODE(); |
f21d96d0 KW |
2342 | |
2343 | if (bs) { | |
b99f7fa0 | 2344 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); |
a46fc9c9 | 2345 | } |
b99f7fa0 | 2346 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); |
454057b7 PL |
2347 | } |
2348 | ||
cc071629 PB |
2349 | int blk_get_max_hw_iov(BlockBackend *blk) |
2350 | { | |
37868b2a | 2351 | IO_CODE(); |
cc071629 PB |
2352 | return MIN_NON_ZERO(blk->root->bs->bl.max_hw_iov, |
2353 | blk->root->bs->bl.max_iov); | |
2354 | } | |
2355 | ||
648296e0 SH |
2356 | int blk_get_max_iov(BlockBackend *blk) |
2357 | { | |
37868b2a | 2358 | IO_CODE(); |
f21d96d0 | 2359 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
2360 | } |
2361 | ||
f1c17521 PB |
2362 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
2363 | { | |
37868b2a | 2364 | IO_CODE(); |
f21d96d0 | 2365 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
2366 | } |
2367 | ||
4be74634 MA |
2368 | void *blk_blockalign(BlockBackend *blk, size_t size) |
2369 | { | |
37868b2a | 2370 | IO_CODE(); |
f21d96d0 | 2371 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
2372 | } |
2373 | ||
2374 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
2375 | { | |
f21d96d0 | 2376 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2377 | GLOBAL_STATE_CODE(); |
277f2007 | 2378 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f21d96d0 KW |
2379 | |
2380 | if (!bs) { | |
a46fc9c9 HR |
2381 | return false; |
2382 | } | |
2383 | ||
f21d96d0 | 2384 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
2385 | } |
2386 | ||
2387 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
2388 | { | |
f21d96d0 | 2389 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2390 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2391 | |
2392 | if (bs) { | |
2393 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 2394 | } |
4be74634 MA |
2395 | } |
2396 | ||
2397 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
2398 | { | |
f21d96d0 | 2399 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2400 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2401 | |
2402 | if (bs) { | |
2403 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 2404 | } |
4be74634 MA |
2405 | } |
2406 | ||
2407 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
2408 | { | |
f21d96d0 | 2409 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2410 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2411 | |
2412 | if (bs) { | |
2413 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 2414 | } |
4be74634 MA |
2415 | } |
2416 | ||
ad893672 HC |
2417 | /** |
2418 | * Return BB's current AioContext. Note that this context may change | |
2419 | * concurrently at any time, with one exception: If the BB has a root node | |
2420 | * attached, its context will only change through bdrv_try_change_aio_context(), | |
2421 | * which creates a drained section. Therefore, incrementing such a BB's | |
2422 | * in-flight counter will prevent its context from changing. | |
2423 | */ | |
4be74634 MA |
2424 | AioContext *blk_get_aio_context(BlockBackend *blk) |
2425 | { | |
37868b2a | 2426 | IO_CODE(); |
d861ab3a | 2427 | |
dea97c1f KW |
2428 | if (!blk) { |
2429 | return qemu_get_aio_context(); | |
2430 | } | |
2431 | ||
ad893672 | 2432 | return qatomic_read(&blk->ctx); |
4981bdec HR |
2433 | } |
2434 | ||
2d196295 SH |
2435 | int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2436 | Error **errp) | |
4be74634 | 2437 | { |
2d196295 | 2438 | bool old_allow_change; |
f21d96d0 | 2439 | BlockDriverState *bs = blk_bs(blk); |
97896a48 | 2440 | int ret; |
f21d96d0 | 2441 | |
2d196295 | 2442 | GLOBAL_STATE_CODE(); |
1e3552db | 2443 | |
2d196295 | 2444 | if (!bs) { |
ad893672 | 2445 | qatomic_set(&blk->ctx, new_context); |
2d196295 | 2446 | return 0; |
a46fc9c9 | 2447 | } |
97896a48 | 2448 | |
2d196295 | 2449 | bdrv_ref(bs); |
4be74634 | 2450 | |
2d196295 SH |
2451 | old_allow_change = blk->allow_aio_context_change; |
2452 | blk->allow_aio_context_change = true; | |
2453 | ||
2454 | ret = bdrv_try_change_aio_context(bs, new_context, NULL, errp); | |
2455 | ||
2456 | blk->allow_aio_context_change = old_allow_change; | |
2457 | ||
2458 | bdrv_unref(bs); | |
2459 | return ret; | |
38475269 KW |
2460 | } |
2461 | ||
33949396 EGE |
2462 | typedef struct BdrvStateBlkRootContext { |
2463 | AioContext *new_ctx; | |
2464 | BlockBackend *blk; | |
2465 | } BdrvStateBlkRootContext; | |
2466 | ||
2467 | static void blk_root_set_aio_ctx_commit(void *opaque) | |
2468 | { | |
2469 | BdrvStateBlkRootContext *s = opaque; | |
2470 | BlockBackend *blk = s->blk; | |
2d196295 SH |
2471 | AioContext *new_context = s->new_ctx; |
2472 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
33949396 | 2473 | |
ad893672 | 2474 | qatomic_set(&blk->ctx, new_context); |
2d196295 SH |
2475 | if (tgm->throttle_state) { |
2476 | throttle_group_detach_aio_context(tgm); | |
2477 | throttle_group_attach_aio_context(tgm, new_context); | |
2478 | } | |
33949396 EGE |
2479 | } |
2480 | ||
2481 | static TransactionActionDrv set_blk_root_context = { | |
2482 | .commit = blk_root_set_aio_ctx_commit, | |
2483 | .clean = g_free, | |
2484 | }; | |
2485 | ||
2486 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, | |
2487 | GHashTable *visited, Transaction *tran, | |
2488 | Error **errp) | |
38475269 KW |
2489 | { |
2490 | BlockBackend *blk = child->opaque; | |
33949396 | 2491 | BdrvStateBlkRootContext *s; |
38475269 | 2492 | |
33949396 EGE |
2493 | if (!blk->allow_aio_context_change) { |
2494 | /* | |
2495 | * Manually created BlockBackends (those with a name) that are not | |
2496 | * attached to anything can change their AioContext without updating | |
2497 | * their user; return an error for others. | |
2498 | */ | |
2499 | if (!blk->name || blk->dev) { | |
2500 | /* TODO Add BB name/QOM path */ | |
2501 | error_setg(errp, "Cannot change iothread of active block backend"); | |
2502 | return false; | |
2503 | } | |
980b0f94 KW |
2504 | } |
2505 | ||
33949396 EGE |
2506 | s = g_new(BdrvStateBlkRootContext, 1); |
2507 | *s = (BdrvStateBlkRootContext) { | |
2508 | .new_ctx = ctx, | |
2509 | .blk = blk, | |
2510 | }; | |
38475269 | 2511 | |
33949396 | 2512 | tran_add(tran, &set_blk_root_context, s); |
38475269 KW |
2513 | return true; |
2514 | } | |
2515 | ||
2019ba0a HR |
2516 | void blk_add_aio_context_notifier(BlockBackend *blk, |
2517 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
2518 | void (*detach_aio_context)(void *opaque), void *opaque) | |
2519 | { | |
d03654ea | 2520 | BlockBackendAioNotifier *notifier; |
f21d96d0 | 2521 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2522 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2523 | |
d03654ea SH |
2524 | notifier = g_new(BlockBackendAioNotifier, 1); |
2525 | notifier->attached_aio_context = attached_aio_context; | |
2526 | notifier->detach_aio_context = detach_aio_context; | |
2527 | notifier->opaque = opaque; | |
2528 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
2529 | ||
f21d96d0 KW |
2530 | if (bs) { |
2531 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2532 | detach_aio_context, opaque); |
2533 | } | |
2019ba0a HR |
2534 | } |
2535 | ||
2536 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
2537 | void (*attached_aio_context)(AioContext *, | |
2538 | void *), | |
2539 | void (*detach_aio_context)(void *), | |
2540 | void *opaque) | |
2541 | { | |
d03654ea | 2542 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
2543 | BlockDriverState *bs = blk_bs(blk); |
2544 | ||
0439c5a4 EGE |
2545 | GLOBAL_STATE_CODE(); |
2546 | ||
f21d96d0 KW |
2547 | if (bs) { |
2548 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2549 | detach_aio_context, opaque); |
2550 | } | |
d03654ea SH |
2551 | |
2552 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
2553 | if (notifier->attached_aio_context == attached_aio_context && | |
2554 | notifier->detach_aio_context == detach_aio_context && | |
2555 | notifier->opaque == opaque) { | |
2556 | QLIST_REMOVE(notifier, list); | |
2557 | g_free(notifier); | |
2558 | return; | |
2559 | } | |
2560 | } | |
2561 | ||
2562 | abort(); | |
2019ba0a HR |
2563 | } |
2564 | ||
3301f6c6 HR |
2565 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
2566 | { | |
0439c5a4 | 2567 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2568 | notifier_list_add(&blk->remove_bs_notifiers, notify); |
2569 | } | |
2570 | ||
2571 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
2572 | { | |
0439c5a4 | 2573 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2574 | notifier_list_add(&blk->insert_bs_notifiers, notify); |
2575 | } | |
2576 | ||
4be74634 MA |
2577 | BlockAcctStats *blk_get_stats(BlockBackend *blk) |
2578 | { | |
37868b2a | 2579 | IO_CODE(); |
7f0e9da6 | 2580 | return &blk->stats; |
4be74634 MA |
2581 | } |
2582 | ||
2583 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
2584 | BlockCompletionFunc *cb, void *opaque) | |
2585 | { | |
37868b2a | 2586 | IO_CODE(); |
4be74634 MA |
2587 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); |
2588 | } | |
1ef01253 | 2589 | |
d004bd52 | 2590 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
34460feb | 2591 | int64_t bytes, BdrvRequestFlags flags) |
1ef01253 | 2592 | { |
37868b2a | 2593 | IO_OR_GS_CODE(); |
f5a5ca79 | 2594 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 2595 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
2596 | } |
2597 | ||
2c9715fa AF |
2598 | int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset, |
2599 | int64_t bytes, const void *buf) | |
1ef01253 | 2600 | { |
06f0325c | 2601 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |
37868b2a | 2602 | IO_OR_GS_CODE(); |
2c9715fa AF |
2603 | return blk_co_pwritev_part(blk, offset, bytes, &qiov, 0, |
2604 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2605 | } |
2606 | ||
015ed252 AF |
2607 | int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact, |
2608 | PreallocMode prealloc, BdrvRequestFlags flags, | |
2609 | Error **errp) | |
1ef01253 | 2610 | { |
37868b2a | 2611 | IO_OR_GS_CODE(); |
c2b8e315 | 2612 | GRAPH_RDLOCK_GUARD(); |
c73ff92c | 2613 | if (!blk_co_is_available(blk)) { |
ed3d2ec9 | 2614 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2615 | return -ENOMEDIUM; |
2616 | } | |
2617 | ||
015ed252 | 2618 | return bdrv_co_truncate(blk->root, offset, exact, prealloc, flags, errp); |
1ef01253 HR |
2619 | } |
2620 | ||
1ef01253 HR |
2621 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, |
2622 | int64_t pos, int size) | |
2623 | { | |
bfd18d1e | 2624 | int ret; |
0439c5a4 | 2625 | GLOBAL_STATE_CODE(); |
bfd18d1e | 2626 | |
c09ba36c HR |
2627 | if (!blk_is_available(blk)) { |
2628 | return -ENOMEDIUM; | |
2629 | } | |
2630 | ||
bfd18d1e KW |
2631 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2632 | if (ret < 0) { | |
2633 | return ret; | |
2634 | } | |
2635 | ||
2636 | if (ret == size && !blk->enable_write_cache) { | |
2637 | ret = bdrv_flush(blk_bs(blk)); | |
2638 | } | |
2639 | ||
2640 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2641 | } |
2642 | ||
2643 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2644 | { | |
0439c5a4 | 2645 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2646 | if (!blk_is_available(blk)) { |
2647 | return -ENOMEDIUM; | |
2648 | } | |
2649 | ||
f21d96d0 | 2650 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2651 | } |
f0272c4d ET |
2652 | |
2653 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2654 | { | |
0439c5a4 | 2655 | GLOBAL_STATE_CODE(); |
221caadc KW |
2656 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
2657 | ||
c09ba36c HR |
2658 | if (!blk_is_available(blk)) { |
2659 | return -ENOMEDIUM; | |
2660 | } | |
2661 | ||
f21d96d0 | 2662 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2663 | } |
2664 | ||
2665 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2666 | { | |
0439c5a4 | 2667 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2668 | if (!blk_is_available(blk)) { |
2669 | return -ENOMEDIUM; | |
2670 | } | |
2671 | ||
f21d96d0 | 2672 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2673 | } |
281d22d8 HR |
2674 | |
2675 | /* | |
2676 | * Updates the BlockBackendRootState object with data from the currently | |
2677 | * attached BlockDriverState. | |
2678 | */ | |
2679 | void blk_update_root_state(BlockBackend *blk) | |
2680 | { | |
0439c5a4 | 2681 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2682 | assert(blk->root); |
281d22d8 | 2683 | |
f21d96d0 | 2684 | blk->root_state.open_flags = blk->root->bs->open_flags; |
f21d96d0 | 2685 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; |
281d22d8 HR |
2686 | } |
2687 | ||
38cb18f5 | 2688 | /* |
b85114f8 KW |
2689 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2690 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2691 | */ |
b85114f8 | 2692 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2693 | { |
0439c5a4 | 2694 | GLOBAL_STATE_CODE(); |
b85114f8 | 2695 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2696 | } |
2697 | ||
2698 | /* | |
2699 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2700 | * supposed to inherit the root state. | |
2701 | */ | |
2702 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2703 | { | |
0439c5a4 | 2704 | GLOBAL_STATE_CODE(); |
260242a8 | 2705 | return blk->root_state.open_flags; |
38cb18f5 HR |
2706 | } |
2707 | ||
281d22d8 HR |
2708 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2709 | { | |
0439c5a4 | 2710 | GLOBAL_STATE_CODE(); |
281d22d8 HR |
2711 | return &blk->root_state; |
2712 | } | |
1393f212 HR |
2713 | |
2714 | int blk_commit_all(void) | |
2715 | { | |
fe1a9cbc | 2716 | BlockBackend *blk = NULL; |
0439c5a4 | 2717 | GLOBAL_STATE_CODE(); |
ad74751f | 2718 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
fe1a9cbc HR |
2719 | |
2720 | while ((blk = blk_all_next(blk)) != NULL) { | |
9a71b9de | 2721 | BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk)); |
fe1a9cbc | 2722 | |
9a71b9de HR |
2723 | if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) { |
2724 | int ret; | |
2725 | ||
2726 | ret = bdrv_commit(unfiltered_bs); | |
fe1a9cbc | 2727 | if (ret < 0) { |
fe1a9cbc HR |
2728 | return ret; |
2729 | } | |
2730 | } | |
fe1a9cbc HR |
2731 | } |
2732 | return 0; | |
2733 | } | |
2734 | ||
97148076 KW |
2735 | |
2736 | /* throttling disk I/O limits */ | |
2737 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2738 | { | |
0439c5a4 | 2739 | GLOBAL_STATE_CODE(); |
022cdc9f | 2740 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2741 | } |
2742 | ||
2743 | void blk_io_limits_disable(BlockBackend *blk) | |
2744 | { | |
48bf7ea8 AG |
2745 | BlockDriverState *bs = blk_bs(blk); |
2746 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2747 | assert(tgm->throttle_state); | |
0439c5a4 | 2748 | GLOBAL_STATE_CODE(); |
48bf7ea8 | 2749 | if (bs) { |
1e3552db | 2750 | bdrv_ref(bs); |
48bf7ea8 AG |
2751 | bdrv_drained_begin(bs); |
2752 | } | |
2753 | throttle_group_unregister_tgm(tgm); | |
2754 | if (bs) { | |
2755 | bdrv_drained_end(bs); | |
1e3552db | 2756 | bdrv_unref(bs); |
48bf7ea8 | 2757 | } |
97148076 KW |
2758 | } |
2759 | ||
2760 | /* should be called before blk_set_io_limits if a limit is set */ | |
2761 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2762 | { | |
022cdc9f | 2763 | assert(!blk->public.throttle_group_member.throttle_state); |
0439c5a4 | 2764 | GLOBAL_STATE_CODE(); |
c61791fc MP |
2765 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2766 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2767 | } |
2768 | ||
2769 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2770 | { | |
0439c5a4 | 2771 | GLOBAL_STATE_CODE(); |
97148076 | 2772 | /* this BB is not part of any group */ |
022cdc9f | 2773 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2774 | return; |
2775 | } | |
2776 | ||
2777 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2778 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2779 | group)) { | |
97148076 KW |
2780 | return; |
2781 | } | |
2782 | ||
2783 | /* need to change the group this bs belong to */ | |
2784 | blk_io_limits_disable(blk); | |
2785 | blk_io_limits_enable(blk, group); | |
2786 | } | |
c2066af0 KW |
2787 | |
2788 | static void blk_root_drained_begin(BdrvChild *child) | |
2789 | { | |
2790 | BlockBackend *blk = child->opaque; | |
d73415a3 | 2791 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
c2066af0 | 2792 | |
c4d5bf99 | 2793 | if (qatomic_fetch_inc(&blk->quiesce_counter) == 0) { |
f4d9cc88 JS |
2794 | if (blk->dev_ops && blk->dev_ops->drained_begin) { |
2795 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2796 | } | |
2797 | } | |
2798 | ||
36fe1331 KW |
2799 | /* Note that blk->root may not be accessible here yet if we are just |
2800 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2801 | ||
d73415a3 SH |
2802 | if (qatomic_fetch_inc(&tgm->io_limits_disabled) == 0) { |
2803 | throttle_group_restart_tgm(tgm); | |
c2066af0 KW |
2804 | } |
2805 | } | |
2806 | ||
fe5258a5 KW |
2807 | static bool blk_root_drained_poll(BdrvChild *child) |
2808 | { | |
2809 | BlockBackend *blk = child->opaque; | |
095cc4d0 | 2810 | bool busy = false; |
c4d5bf99 | 2811 | assert(qatomic_read(&blk->quiesce_counter)); |
095cc4d0 SL |
2812 | |
2813 | if (blk->dev_ops && blk->dev_ops->drained_poll) { | |
2814 | busy = blk->dev_ops->drained_poll(blk->dev_opaque); | |
2815 | } | |
2816 | return busy || !!blk->in_flight; | |
fe5258a5 KW |
2817 | } |
2818 | ||
2f65df6e | 2819 | static void blk_root_drained_end(BdrvChild *child) |
c2066af0 KW |
2820 | { |
2821 | BlockBackend *blk = child->opaque; | |
c4d5bf99 | 2822 | assert(qatomic_read(&blk->quiesce_counter)); |
c2066af0 | 2823 | |
022cdc9f | 2824 | assert(blk->public.throttle_group_member.io_limits_disabled); |
d73415a3 | 2825 | qatomic_dec(&blk->public.throttle_group_member.io_limits_disabled); |
f4d9cc88 | 2826 | |
c4d5bf99 | 2827 | if (qatomic_fetch_dec(&blk->quiesce_counter) == 1) { |
f4d9cc88 JS |
2828 | if (blk->dev_ops && blk->dev_ops->drained_end) { |
2829 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2830 | } | |
407ae2ae SH |
2831 | qemu_mutex_lock(&blk->queued_requests_lock); |
2832 | while (qemu_co_enter_next(&blk->queued_requests, | |
2833 | &blk->queued_requests_lock)) { | |
cf312932 KW |
2834 | /* Resume all queued requests */ |
2835 | } | |
407ae2ae | 2836 | qemu_mutex_unlock(&blk->queued_requests_lock); |
f4d9cc88 | 2837 | } |
c2066af0 | 2838 | } |
23d0ba93 | 2839 | |
f4ec04ba | 2840 | bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp) |
23d0ba93 | 2841 | { |
71038951 SH |
2842 | BlockDriverState *bs = blk_bs(blk); |
2843 | ||
0439c5a4 | 2844 | GLOBAL_STATE_CODE(); |
71038951 SH |
2845 | |
2846 | if (bs) { | |
2847 | return bdrv_register_buf(bs, host, size, errp); | |
2848 | } | |
2849 | return true; | |
23d0ba93 FZ |
2850 | } |
2851 | ||
4f384011 | 2852 | void blk_unregister_buf(BlockBackend *blk, void *host, size_t size) |
23d0ba93 | 2853 | { |
71038951 SH |
2854 | BlockDriverState *bs = blk_bs(blk); |
2855 | ||
0439c5a4 | 2856 | GLOBAL_STATE_CODE(); |
71038951 SH |
2857 | |
2858 | if (bs) { | |
2859 | bdrv_unregister_buf(bs, host, size); | |
2860 | } | |
23d0ba93 | 2861 | } |
b5679fa4 FZ |
2862 | |
2863 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2864 | BlockBackend *blk_out, int64_t off_out, | |
e192179b | 2865 | int64_t bytes, BdrvRequestFlags read_flags, |
67b51fb9 | 2866 | BdrvRequestFlags write_flags) |
b5679fa4 FZ |
2867 | { |
2868 | int r; | |
37868b2a | 2869 | IO_CODE(); |
c73ff92c | 2870 | GRAPH_RDLOCK_GUARD(); |
37868b2a | 2871 | |
b5679fa4 FZ |
2872 | r = blk_check_byte_request(blk_in, off_in, bytes); |
2873 | if (r) { | |
2874 | return r; | |
2875 | } | |
2876 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2877 | if (r) { | |
2878 | return r; | |
2879 | } | |
742bf09b | 2880 | |
b5679fa4 FZ |
2881 | return bdrv_co_copy_range(blk_in->root, off_in, |
2882 | blk_out->root, off_out, | |
67b51fb9 | 2883 | bytes, read_flags, write_flags); |
b5679fa4 | 2884 | } |
5d3b4e99 VSO |
2885 | |
2886 | const BdrvChild *blk_root(BlockBackend *blk) | |
2887 | { | |
0439c5a4 | 2888 | GLOBAL_STATE_CODE(); |
5d3b4e99 VSO |
2889 | return blk->root; |
2890 | } | |
2b7bbdbd HR |
2891 | |
2892 | int blk_make_empty(BlockBackend *blk, Error **errp) | |
2893 | { | |
0439c5a4 | 2894 | GLOBAL_STATE_CODE(); |
0bb79c97 KW |
2895 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
2896 | ||
2b7bbdbd HR |
2897 | if (!blk_is_available(blk)) { |
2898 | error_setg(errp, "No medium inserted"); | |
2899 | return -ENOMEDIUM; | |
2900 | } | |
2901 | ||
2902 | return bdrv_make_empty(blk->root, errp); | |
2903 | } |