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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; |
d861ab3a | 47 | AioContext *ctx; |
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. | |
4c20dd24 KW |
393 | * |
394 | * Callers must hold the AioContext lock of @bs. | |
a3aeeab5 EB |
395 | */ |
396 | BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm, | |
397 | uint64_t shared_perm, Error **errp) | |
398 | { | |
399 | BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm); | |
400 | ||
0439c5a4 EGE |
401 | GLOBAL_STATE_CODE(); |
402 | ||
a3aeeab5 EB |
403 | if (blk_insert_bs(blk, bs, errp) < 0) { |
404 | blk_unref(blk); | |
405 | return NULL; | |
406 | } | |
407 | return blk; | |
408 | } | |
409 | ||
7e7d56d9 | 410 | /* |
28eb9b12 | 411 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
4c20dd24 KW |
412 | * By default, the new BlockBackend is in the main AioContext, but if the |
413 | * parameters connect it with any existing node in a different AioContext, it | |
414 | * may end up there instead. | |
ca49a4fd HR |
415 | * |
416 | * Just as with bdrv_open(), after having called this function the reference to | |
417 | * @options belongs to the block layer (even on failure). | |
418 | * | |
4c20dd24 KW |
419 | * Called without holding an AioContext lock. |
420 | * | |
ca49a4fd HR |
421 | * TODO: Remove @filename and @flags; it should be possible to specify a whole |
422 | * BDS tree just by specifying the @options QDict (or @reference, | |
423 | * alternatively). At the time of adding this function, this is not possible, | |
424 | * though, so callers of this function have to be able to specify @filename and | |
425 | * @flags. | |
426 | */ | |
efaa7c4e HR |
427 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
428 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
429 | { |
430 | BlockBackend *blk; | |
28eb9b12 | 431 | BlockDriverState *bs; |
4c20dd24 | 432 | AioContext *ctx; |
1f4ad7d3 | 433 | uint64_t perm = 0; |
35b7f4ab | 434 | uint64_t shared = BLK_PERM_ALL; |
c62d32f5 | 435 | |
0439c5a4 EGE |
436 | GLOBAL_STATE_CODE(); |
437 | ||
35b7f4ab KW |
438 | /* |
439 | * blk_new_open() is mainly used in .bdrv_create implementations and the | |
440 | * tools where sharing isn't a major concern because the BDS stays private | |
441 | * and the file is generally not supposed to be used by a second process, | |
442 | * so we just request permission according to the flags. | |
c62d32f5 KW |
443 | * |
444 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
445 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
446 | * shouldn't hurt either. We can still share everything here because the | |
35b7f4ab KW |
447 | * guest devices will add their own blockers if they can't share. |
448 | */ | |
1f4ad7d3 KW |
449 | if ((flags & BDRV_O_NO_IO) == 0) { |
450 | perm |= BLK_PERM_CONSISTENT_READ; | |
451 | if (flags & BDRV_O_RDWR) { | |
452 | perm |= BLK_PERM_WRITE; | |
453 | } | |
c62d32f5 KW |
454 | } |
455 | if (flags & BDRV_O_RESIZE) { | |
456 | perm |= BLK_PERM_RESIZE; | |
457 | } | |
35b7f4ab KW |
458 | if (flags & BDRV_O_NO_SHARE) { |
459 | shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; | |
460 | } | |
ca49a4fd | 461 | |
c6e0a6de | 462 | aio_context_acquire(qemu_get_aio_context()); |
5b363937 | 463 | bs = bdrv_open(filename, reference, options, flags, errp); |
c6e0a6de | 464 | aio_context_release(qemu_get_aio_context()); |
5b363937 | 465 | if (!bs) { |
ca49a4fd HR |
466 | return NULL; |
467 | } | |
468 | ||
4c20dd24 KW |
469 | /* bdrv_open() could have moved bs to a different AioContext */ |
470 | ctx = bdrv_get_aio_context(bs); | |
471 | blk = blk_new(bdrv_get_aio_context(bs), perm, shared); | |
472 | blk->perm = perm; | |
473 | blk->shared_perm = shared; | |
474 | ||
475 | aio_context_acquire(ctx); | |
476 | blk_insert_bs(blk, bs, errp); | |
477 | bdrv_unref(bs); | |
478 | aio_context_release(ctx); | |
479 | ||
50bfbe93 | 480 | if (!blk->root) { |
50bfbe93 FZ |
481 | blk_unref(blk); |
482 | return NULL; | |
483 | } | |
72e775c7 | 484 | |
ca49a4fd HR |
485 | return blk; |
486 | } | |
487 | ||
26f54e9a MA |
488 | static void blk_delete(BlockBackend *blk) |
489 | { | |
490 | assert(!blk->refcnt); | |
e5e78550 | 491 | assert(!blk->name); |
a7f53e26 | 492 | assert(!blk->dev); |
022cdc9f | 493 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
494 | blk_io_limits_disable(blk); |
495 | } | |
f21d96d0 | 496 | if (blk->root) { |
13855c6b | 497 | blk_remove_bs(blk); |
7e7d56d9 | 498 | } |
5f7772c4 FZ |
499 | if (blk->vmsh) { |
500 | qemu_del_vm_change_state_handler(blk->vmsh); | |
501 | blk->vmsh = NULL; | |
502 | } | |
3301f6c6 HR |
503 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
504 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 505 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
407ae2ae SH |
506 | assert(qemu_co_queue_empty(&blk->queued_requests)); |
507 | qemu_mutex_destroy(&blk->queued_requests_lock); | |
2cf22d6a | 508 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 509 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 510 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
511 | g_free(blk); |
512 | } | |
513 | ||
8fb3c76c MA |
514 | static void drive_info_del(DriveInfo *dinfo) |
515 | { | |
516 | if (!dinfo) { | |
517 | return; | |
518 | } | |
519 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
520 | g_free(dinfo); |
521 | } | |
522 | ||
f636ae85 AG |
523 | int blk_get_refcnt(BlockBackend *blk) |
524 | { | |
0439c5a4 | 525 | GLOBAL_STATE_CODE(); |
f636ae85 AG |
526 | return blk ? blk->refcnt : 0; |
527 | } | |
528 | ||
26f54e9a MA |
529 | /* |
530 | * Increment @blk's reference count. | |
531 | * @blk must not be null. | |
532 | */ | |
533 | void blk_ref(BlockBackend *blk) | |
534 | { | |
5ca9d21b | 535 | assert(blk->refcnt > 0); |
0439c5a4 | 536 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
537 | blk->refcnt++; |
538 | } | |
539 | ||
540 | /* | |
541 | * Decrement @blk's reference count. | |
542 | * If this drops it to zero, destroy @blk. | |
543 | * For convenience, do nothing if @blk is null. | |
544 | */ | |
545 | void blk_unref(BlockBackend *blk) | |
546 | { | |
0439c5a4 | 547 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
548 | if (blk) { |
549 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
550 | if (blk->refcnt > 1) { |
551 | blk->refcnt--; | |
552 | } else { | |
553 | blk_drain(blk); | |
554 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
555 | assert(blk->refcnt == 1); | |
556 | blk->refcnt = 0; | |
26f54e9a MA |
557 | blk_delete(blk); |
558 | } | |
559 | } | |
560 | } | |
561 | ||
2cf22d6a HR |
562 | /* |
563 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
564 | * ones which are hidden (i.e. are not referenced by the monitor). | |
565 | */ | |
a429b9b5 | 566 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a | 567 | { |
0439c5a4 | 568 | GLOBAL_STATE_CODE(); |
2cf22d6a HR |
569 | return blk ? QTAILQ_NEXT(blk, link) |
570 | : QTAILQ_FIRST(&block_backends); | |
571 | } | |
572 | ||
d8da3cef HR |
573 | void blk_remove_all_bs(void) |
574 | { | |
74d1b8fc | 575 | BlockBackend *blk = NULL; |
d8da3cef | 576 | |
0439c5a4 EGE |
577 | GLOBAL_STATE_CODE(); |
578 | ||
2cf22d6a | 579 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
580 | AioContext *ctx = blk_get_aio_context(blk); |
581 | ||
582 | aio_context_acquire(ctx); | |
f21d96d0 | 583 | if (blk->root) { |
d8da3cef HR |
584 | blk_remove_bs(blk); |
585 | } | |
586 | aio_context_release(ctx); | |
587 | } | |
588 | } | |
589 | ||
26f54e9a | 590 | /* |
9492b0b9 | 591 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
592 | * If @blk is null, return the first one. |
593 | * Else, return @blk's next sibling, which may be null. | |
594 | * | |
595 | * To iterate over all BlockBackends, do | |
596 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
597 | * ... | |
598 | * } | |
599 | */ | |
600 | BlockBackend *blk_next(BlockBackend *blk) | |
601 | { | |
0439c5a4 | 602 | GLOBAL_STATE_CODE(); |
9492b0b9 HR |
603 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
604 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
605 | } |
606 | ||
7c8eece4 KW |
607 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
608 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 609 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 610 | { |
5e003f17 HR |
611 | BlockDriverState *bs, *old_bs; |
612 | ||
613 | /* Must be called from the main loop */ | |
614 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 615 | |
7c8eece4 KW |
616 | /* First, return all root nodes of BlockBackends. In order to avoid |
617 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
618 | * if the BB is the first one in the parent list of the BDS. */ | |
619 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
620 | BlockBackend *old_blk = it->blk; |
621 | ||
622 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
623 | ||
7c8eece4 KW |
624 | do { |
625 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
626 | bs = it->blk ? blk_bs(it->blk) : NULL; |
627 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 628 | |
5e003f17 HR |
629 | if (it->blk) { |
630 | blk_ref(it->blk); | |
631 | } | |
632 | blk_unref(old_blk); | |
633 | ||
88be7b4b | 634 | if (bs) { |
5e003f17 HR |
635 | bdrv_ref(bs); |
636 | bdrv_unref(old_bs); | |
88be7b4b | 637 | return bs; |
7c8eece4 KW |
638 | } |
639 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
640 | } else { |
641 | old_bs = it->bs; | |
7c8eece4 KW |
642 | } |
643 | ||
644 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
645 | * BDSes that are attached to a BlockBackend here; they have been handled | |
646 | * by the above block already */ | |
981f4f57 | 647 | do { |
7c8eece4 | 648 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
649 | bs = it->bs; |
650 | } while (bs && bdrv_has_blk(bs)); | |
651 | ||
5e003f17 HR |
652 | if (bs) { |
653 | bdrv_ref(bs); | |
654 | } | |
655 | bdrv_unref(old_bs); | |
656 | ||
88be7b4b KW |
657 | return bs; |
658 | } | |
659 | ||
5e003f17 | 660 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
661 | { |
662 | *it = (BdrvNextIterator) { | |
663 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
664 | }; | |
5e003f17 | 665 | } |
981f4f57 | 666 | |
5e003f17 HR |
667 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
668 | { | |
0439c5a4 | 669 | GLOBAL_STATE_CODE(); |
5e003f17 | 670 | bdrv_next_reset(it); |
88be7b4b | 671 | return bdrv_next(it); |
981f4f57 HR |
672 | } |
673 | ||
5e003f17 HR |
674 | /* Must be called when aborting a bdrv_next() iteration before |
675 | * bdrv_next() returns NULL */ | |
676 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
677 | { | |
678 | /* Must be called from the main loop */ | |
679 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
680 | ||
681 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
682 | if (it->blk) { | |
683 | bdrv_unref(blk_bs(it->blk)); | |
684 | blk_unref(it->blk); | |
685 | } | |
686 | } else { | |
687 | bdrv_unref(it->bs); | |
688 | } | |
689 | ||
690 | bdrv_next_reset(it); | |
691 | } | |
692 | ||
e5e78550 HR |
693 | /* |
694 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
695 | * the given @name acting as the handle for the monitor. | |
696 | * Strictly for use by blockdev.c. | |
697 | * | |
698 | * @name must not be null or empty. | |
699 | * | |
700 | * Returns true on success and false on failure. In the latter case, an Error | |
701 | * object is returned through @errp. | |
702 | */ | |
703 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
704 | { | |
705 | assert(!blk->name); | |
706 | assert(name && name[0]); | |
0439c5a4 | 707 | GLOBAL_STATE_CODE(); |
e5e78550 HR |
708 | |
709 | if (!id_wellformed(name)) { | |
710 | error_setg(errp, "Invalid device name"); | |
711 | return false; | |
712 | } | |
713 | if (blk_by_name(name)) { | |
714 | error_setg(errp, "Device with id '%s' already exists", name); | |
715 | return false; | |
716 | } | |
717 | if (bdrv_find_node(name)) { | |
718 | error_setg(errp, | |
719 | "Device name '%s' conflicts with an existing node name", | |
720 | name); | |
721 | return false; | |
722 | } | |
723 | ||
724 | blk->name = g_strdup(name); | |
725 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
726 | return true; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
731 | * Strictly for use by blockdev.c. | |
732 | */ | |
733 | void monitor_remove_blk(BlockBackend *blk) | |
734 | { | |
0439c5a4 EGE |
735 | GLOBAL_STATE_CODE(); |
736 | ||
e5e78550 HR |
737 | if (!blk->name) { |
738 | return; | |
739 | } | |
740 | ||
741 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
742 | g_free(blk->name); | |
743 | blk->name = NULL; | |
744 | } | |
745 | ||
26f54e9a | 746 | /* |
7e7d56d9 | 747 | * Return @blk's name, a non-null string. |
e5e78550 | 748 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 749 | */ |
0731a50f | 750 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 751 | { |
37868b2a | 752 | IO_CODE(); |
e5e78550 | 753 | return blk->name ?: ""; |
26f54e9a MA |
754 | } |
755 | ||
756 | /* | |
757 | * Return the BlockBackend with name @name if it exists, else null. | |
758 | * @name must not be null. | |
759 | */ | |
760 | BlockBackend *blk_by_name(const char *name) | |
761 | { | |
74d1b8fc | 762 | BlockBackend *blk = NULL; |
26f54e9a | 763 | |
0439c5a4 | 764 | GLOBAL_STATE_CODE(); |
26f54e9a | 765 | assert(name); |
74d1b8fc | 766 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
767 | if (!strcmp(name, blk->name)) { |
768 | return blk; | |
769 | } | |
770 | } | |
771 | return NULL; | |
772 | } | |
7e7d56d9 MA |
773 | |
774 | /* | |
775 | * Return the BlockDriverState attached to @blk if any, else null. | |
776 | */ | |
777 | BlockDriverState *blk_bs(BlockBackend *blk) | |
778 | { | |
37868b2a | 779 | IO_CODE(); |
f21d96d0 | 780 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
781 | } |
782 | ||
2b3912f1 | 783 | static BlockBackend * GRAPH_RDLOCK bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
784 | { |
785 | BdrvChild *child; | |
bdb73476 EGE |
786 | |
787 | GLOBAL_STATE_CODE(); | |
2b3912f1 | 788 | assert_bdrv_graph_readable(); |
bdb73476 | 789 | |
dde33812 | 790 | QLIST_FOREACH(child, &bs->parents, next_parent) { |
bd86fb99 | 791 | if (child->klass == &child_root) { |
7c8eece4 | 792 | return child->opaque; |
dde33812 KW |
793 | } |
794 | } | |
795 | ||
7c8eece4 KW |
796 | return NULL; |
797 | } | |
798 | ||
799 | /* | |
800 | * Returns true if @bs has an associated BlockBackend. | |
801 | */ | |
802 | bool bdrv_has_blk(BlockDriverState *bs) | |
803 | { | |
0439c5a4 | 804 | GLOBAL_STATE_CODE(); |
7c8eece4 | 805 | return bdrv_first_blk(bs) != NULL; |
dde33812 KW |
806 | } |
807 | ||
b6c1bae5 KW |
808 | /* |
809 | * Returns true if @bs has only BlockBackends as parents. | |
810 | */ | |
811 | bool bdrv_is_root_node(BlockDriverState *bs) | |
812 | { | |
813 | BdrvChild *c; | |
814 | ||
0439c5a4 | 815 | GLOBAL_STATE_CODE(); |
2b3912f1 KW |
816 | assert_bdrv_graph_readable(); |
817 | ||
b6c1bae5 | 818 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
bd86fb99 | 819 | if (c->klass != &child_root) { |
b6c1bae5 KW |
820 | return false; |
821 | } | |
822 | } | |
823 | ||
824 | return true; | |
825 | } | |
826 | ||
18e46a03 MA |
827 | /* |
828 | * Return @blk's DriveInfo if any, else null. | |
829 | */ | |
830 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
831 | { | |
c5be7445 | 832 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
833 | return blk->legacy_dinfo; |
834 | } | |
835 | ||
836 | /* | |
837 | * Set @blk's DriveInfo to @dinfo, and return it. | |
838 | * @blk must not have a DriveInfo set already. | |
839 | * No other BlockBackend may have the same DriveInfo set. | |
840 | */ | |
841 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
842 | { | |
843 | assert(!blk->legacy_dinfo); | |
c5be7445 | 844 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
845 | return blk->legacy_dinfo = dinfo; |
846 | } | |
847 | ||
848 | /* | |
849 | * Return the BlockBackend with DriveInfo @dinfo. | |
850 | * It must exist. | |
851 | */ | |
852 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
853 | { | |
74d1b8fc | 854 | BlockBackend *blk = NULL; |
c5be7445 | 855 | GLOBAL_STATE_CODE(); |
18e46a03 | 856 | |
74d1b8fc | 857 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
858 | if (blk->legacy_dinfo == dinfo) { |
859 | return blk; | |
860 | } | |
861 | } | |
862 | abort(); | |
863 | } | |
864 | ||
f2cd875d KW |
865 | /* |
866 | * Returns a pointer to the publicly accessible fields of @blk. | |
867 | */ | |
868 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
869 | { | |
0439c5a4 | 870 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
871 | return &blk->public; |
872 | } | |
873 | ||
874 | /* | |
875 | * Returns a BlockBackend given the associated @public fields. | |
876 | */ | |
877 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
878 | { | |
0439c5a4 | 879 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
880 | return container_of(public, BlockBackend, public); |
881 | } | |
882 | ||
1c95f7e1 HR |
883 | /* |
884 | * Disassociates the currently associated BlockDriverState from @blk. | |
885 | */ | |
886 | void blk_remove_bs(BlockBackend *blk) | |
887 | { | |
c89bcf3a | 888 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
e6cada92 | 889 | BdrvChild *root; |
022cdc9f | 890 | |
0439c5a4 EGE |
891 | GLOBAL_STATE_CODE(); |
892 | ||
3301f6c6 | 893 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 894 | if (tgm->throttle_state) { |
1e3552db SH |
895 | BlockDriverState *bs = blk_bs(blk); |
896 | ||
897 | /* | |
898 | * Take a ref in case blk_bs() changes across bdrv_drained_begin(), for | |
899 | * example, if a temporary filter node is removed by a blockjob. | |
900 | */ | |
901 | bdrv_ref(bs); | |
632a7735 | 902 | bdrv_drained_begin(bs); |
c89bcf3a AG |
903 | throttle_group_detach_aio_context(tgm); |
904 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 905 | bdrv_drained_end(bs); |
1e3552db | 906 | bdrv_unref(bs); |
a5614993 | 907 | } |
1c95f7e1 | 908 | |
7ca7f0f6 KW |
909 | blk_update_root_state(blk); |
910 | ||
f45280cb GK |
911 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
912 | * switch to a completion coroutine later on. Let's drain all I/O here | |
913 | * to avoid that and a potential QEMU crash. | |
914 | */ | |
915 | blk_drain(blk); | |
e6cada92 | 916 | root = blk->root; |
f21d96d0 | 917 | blk->root = NULL; |
ede01e46 KW |
918 | |
919 | bdrv_graph_wrlock(NULL); | |
e6cada92 | 920 | bdrv_root_unref_child(root); |
ede01e46 | 921 | bdrv_graph_wrunlock(); |
1c95f7e1 HR |
922 | } |
923 | ||
0c3c36d6 HR |
924 | /* |
925 | * Associates a new BlockDriverState with @blk. | |
4c20dd24 KW |
926 | * |
927 | * Callers must hold the AioContext lock of @bs. | |
0c3c36d6 | 928 | */ |
d7086422 | 929 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 930 | { |
c89bcf3a | 931 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
0439c5a4 | 932 | GLOBAL_STATE_CODE(); |
b441dc71 | 933 | bdrv_ref(bs); |
1f38f04e HR |
934 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
935 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
228ca37e | 936 | blk->perm, blk->shared_perm, |
1f38f04e | 937 | blk, errp); |
d7086422 KW |
938 | if (blk->root == NULL) { |
939 | return -EPERM; | |
940 | } | |
3301f6c6 HR |
941 | |
942 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
943 | if (tgm->throttle_state) { |
944 | throttle_group_detach_aio_context(tgm); | |
945 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 946 | } |
d7086422 KW |
947 | |
948 | return 0; | |
0c3c36d6 HR |
949 | } |
950 | ||
ed089506 VSO |
951 | /* |
952 | * Change BlockDriverState associated with @blk. | |
953 | */ | |
954 | int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp) | |
955 | { | |
0439c5a4 | 956 | GLOBAL_STATE_CODE(); |
ed089506 VSO |
957 | return bdrv_replace_child_bs(blk->root, new_bs, errp); |
958 | } | |
959 | ||
981776b3 KW |
960 | /* |
961 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
962 | */ | |
3804e3cf KW |
963 | static int coroutine_mixed_fn GRAPH_RDLOCK |
964 | blk_set_perm_locked(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
965 | Error **errp) | |
981776b3 KW |
966 | { |
967 | int ret; | |
0439c5a4 | 968 | GLOBAL_STATE_CODE(); |
981776b3 | 969 | |
d35ff5e6 | 970 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
971 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
972 | if (ret < 0) { | |
973 | return ret; | |
974 | } | |
975 | } | |
976 | ||
977 | blk->perm = perm; | |
978 | blk->shared_perm = shared_perm; | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
3804e3cf KW |
983 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, |
984 | Error **errp) | |
985 | { | |
986 | GLOBAL_STATE_CODE(); | |
987 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
988 | ||
989 | return blk_set_perm_locked(blk, perm, shared_perm, errp); | |
990 | } | |
991 | ||
887354bd KW |
992 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
993 | { | |
0439c5a4 | 994 | GLOBAL_STATE_CODE(); |
887354bd KW |
995 | *perm = blk->perm; |
996 | *shared_perm = blk->shared_perm; | |
997 | } | |
998 | ||
d09ea2d2 TH |
999 | /* |
1000 | * Attach device model @dev to @blk. | |
1001 | * Return 0 on success, -EBUSY when a device model is attached already. | |
1002 | */ | |
1003 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
4be74634 | 1004 | { |
0439c5a4 | 1005 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1006 | if (blk->dev) { |
1007 | return -EBUSY; | |
1008 | } | |
d35ff5e6 KW |
1009 | |
1010 | /* While migration is still incoming, we don't need to apply the | |
1011 | * permissions of guest device BlockBackends. We might still have a block | |
1012 | * job or NBD server writing to the image for storage migration. */ | |
1013 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
1014 | blk->disable_perm = true; | |
1015 | } | |
1016 | ||
84ebe375 | 1017 | blk_ref(blk); |
a7f53e26 | 1018 | blk->dev = dev; |
373340b2 | 1019 | blk_iostatus_reset(blk); |
d35ff5e6 | 1020 | |
a7f53e26 | 1021 | return 0; |
4be74634 MA |
1022 | } |
1023 | ||
a7f53e26 MA |
1024 | /* |
1025 | * Detach device model @dev from @blk. | |
1026 | * @dev must be currently attached to @blk. | |
1027 | */ | |
d09ea2d2 | 1028 | void blk_detach_dev(BlockBackend *blk, DeviceState *dev) |
4be74634 | 1029 | { |
a7f53e26 | 1030 | assert(blk->dev == dev); |
0439c5a4 | 1031 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1032 | blk->dev = NULL; |
1033 | blk->dev_ops = NULL; | |
1034 | blk->dev_opaque = NULL; | |
981776b3 | 1035 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 1036 | blk_unref(blk); |
4be74634 MA |
1037 | } |
1038 | ||
a7f53e26 MA |
1039 | /* |
1040 | * Return the device model attached to @blk if any, else null. | |
1041 | */ | |
d09ea2d2 | 1042 | DeviceState *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 | 1043 | { |
0439c5a4 | 1044 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1045 | return blk->dev; |
1046 | } | |
1047 | ||
2d76e724 KW |
1048 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
1049 | * device attached to the BlockBackend. */ | |
77beef83 | 1050 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 | 1051 | { |
d09ea2d2 | 1052 | DeviceState *dev = blk->dev; |
37868b2a | 1053 | IO_CODE(); |
2d76e724 KW |
1054 | |
1055 | if (!dev) { | |
1056 | return g_strdup(""); | |
1057 | } else if (dev->id) { | |
1058 | return g_strdup(dev->id); | |
1059 | } | |
602414d1 LM |
1060 | |
1061 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
1062 | } |
1063 | ||
1c89e1fa KW |
1064 | /* |
1065 | * Return the BlockBackend which has the device model @dev attached if it | |
1066 | * exists, else null. | |
1067 | * | |
1068 | * @dev must not be null. | |
1069 | */ | |
1070 | BlockBackend *blk_by_dev(void *dev) | |
1071 | { | |
1072 | BlockBackend *blk = NULL; | |
1073 | ||
0439c5a4 EGE |
1074 | GLOBAL_STATE_CODE(); |
1075 | ||
1c89e1fa KW |
1076 | assert(dev != NULL); |
1077 | while ((blk = blk_all_next(blk)) != NULL) { | |
1078 | if (blk->dev == dev) { | |
1079 | return blk; | |
1080 | } | |
1081 | } | |
1082 | return NULL; | |
1083 | } | |
1084 | ||
a7f53e26 MA |
1085 | /* |
1086 | * Set @blk's device model callbacks to @ops. | |
1087 | * @opaque is the opaque argument to pass to the callbacks. | |
1088 | * This is for use by device models. | |
1089 | */ | |
1090 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
1091 | void *opaque) | |
1092 | { | |
0439c5a4 | 1093 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1094 | blk->dev_ops = ops; |
1095 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
1096 | |
1097 | /* Are we currently quiesced? Should we enforce this right now? */ | |
c4d5bf99 | 1098 | if (qatomic_read(&blk->quiesce_counter) && ops && ops->drained_begin) { |
f4d9cc88 JS |
1099 | ops->drained_begin(opaque); |
1100 | } | |
a7f53e26 MA |
1101 | } |
1102 | ||
1103 | /* | |
1104 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
1105 | * |
1106 | * If @load is true, notify of media load. This action can fail, meaning that | |
1107 | * the medium cannot be loaded. @errp is set then. | |
1108 | * | |
1109 | * If @load is false, notify of media eject. This can never fail. | |
1110 | * | |
a7f53e26 MA |
1111 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
1112 | */ | |
39829a01 | 1113 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 | 1114 | { |
0439c5a4 | 1115 | GLOBAL_STATE_CODE(); |
a7f53e26 | 1116 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { |
f1f57066 | 1117 | bool tray_was_open, tray_is_open; |
39829a01 | 1118 | Error *local_err = NULL; |
a7f53e26 | 1119 | |
f1f57066 | 1120 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
1121 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
1122 | if (local_err) { | |
1123 | assert(load == true); | |
1124 | error_propagate(errp, local_err); | |
1125 | return; | |
1126 | } | |
f1f57066 HR |
1127 | tray_is_open = blk_dev_is_tray_open(blk); |
1128 | ||
1129 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 1130 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 1131 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 1132 | g_free(id); |
a7f53e26 MA |
1133 | } |
1134 | } | |
1135 | } | |
1136 | ||
5c8cab48 KW |
1137 | static void blk_root_change_media(BdrvChild *child, bool load) |
1138 | { | |
39829a01 | 1139 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
1140 | } |
1141 | ||
a7f53e26 MA |
1142 | /* |
1143 | * Does @blk's attached device model have removable media? | |
1144 | * %true if no device model is attached. | |
1145 | */ | |
1146 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
1147 | { | |
b4ad82aa | 1148 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1149 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); |
1150 | } | |
1151 | ||
8f3a73bc HR |
1152 | /* |
1153 | * Does @blk's attached device model have a tray? | |
1154 | */ | |
1155 | bool blk_dev_has_tray(BlockBackend *blk) | |
1156 | { | |
967d7905 | 1157 | IO_CODE(); |
8f3a73bc HR |
1158 | return blk->dev_ops && blk->dev_ops->is_tray_open; |
1159 | } | |
1160 | ||
a7f53e26 MA |
1161 | /* |
1162 | * Notify @blk's attached device model of a media eject request. | |
1163 | * If @force is true, the medium is about to be yanked out forcefully. | |
1164 | */ | |
1165 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1166 | { |
b4ad82aa | 1167 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1168 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1169 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1170 | } | |
4be74634 MA |
1171 | } |
1172 | ||
a7f53e26 MA |
1173 | /* |
1174 | * Does @blk's attached device model have a tray, and is it open? | |
1175 | */ | |
1176 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1177 | { |
967d7905 | 1178 | IO_CODE(); |
8f3a73bc | 1179 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1180 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1181 | } | |
1182 | return false; | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * Does @blk's attached device model have the medium locked? | |
1187 | * %false if the device model has no such lock. | |
1188 | */ | |
1189 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1190 | { | |
b4ad82aa | 1191 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1192 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { |
1193 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1194 | } | |
1195 | return false; | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Notify @blk's attached device model of a backend size change. | |
1200 | */ | |
5c8cab48 | 1201 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1202 | { |
5c8cab48 KW |
1203 | BlockBackend *blk = child->opaque; |
1204 | ||
a7f53e26 MA |
1205 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1206 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | void blk_iostatus_enable(BlockBackend *blk) | |
1211 | { | |
0439c5a4 | 1212 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1213 | blk->iostatus_enabled = true; |
1214 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1215 | } | |
1216 | ||
1217 | /* The I/O status is only enabled if the drive explicitly | |
1218 | * enables it _and_ the VM is configured to stop on errors */ | |
1219 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1220 | { | |
37868b2a | 1221 | IO_CODE(); |
373340b2 HR |
1222 | return (blk->iostatus_enabled && |
1223 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1224 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1225 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1226 | } | |
1227 | ||
1228 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1229 | { | |
0439c5a4 | 1230 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1231 | return blk->iostatus; |
1232 | } | |
1233 | ||
1234 | void blk_iostatus_disable(BlockBackend *blk) | |
1235 | { | |
0439c5a4 | 1236 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1237 | blk->iostatus_enabled = false; |
1238 | } | |
1239 | ||
1240 | void blk_iostatus_reset(BlockBackend *blk) | |
1241 | { | |
0439c5a4 | 1242 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1243 | if (blk_iostatus_is_enabled(blk)) { |
1244 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
373340b2 HR |
1245 | } |
1246 | } | |
1247 | ||
1248 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1249 | { | |
37868b2a | 1250 | IO_CODE(); |
373340b2 HR |
1251 | assert(blk_iostatus_is_enabled(blk)); |
1252 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1253 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1254 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1255 | } | |
4be74634 MA |
1256 | } |
1257 | ||
c10c9d96 KW |
1258 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1259 | { | |
37868b2a | 1260 | IO_CODE(); |
c10c9d96 KW |
1261 | blk->allow_write_beyond_eof = allow; |
1262 | } | |
1263 | ||
980b0f94 KW |
1264 | void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow) |
1265 | { | |
37868b2a | 1266 | IO_CODE(); |
980b0f94 KW |
1267 | blk->allow_aio_context_change = allow; |
1268 | } | |
1269 | ||
cf312932 KW |
1270 | void blk_set_disable_request_queuing(BlockBackend *blk, bool disable) |
1271 | { | |
37868b2a | 1272 | IO_CODE(); |
ef80ec50 | 1273 | qatomic_set(&blk->disable_request_queuing, disable); |
cf312932 KW |
1274 | } |
1275 | ||
c73ff92c EGE |
1276 | static int coroutine_fn GRAPH_RDLOCK |
1277 | blk_check_byte_request(BlockBackend *blk, int64_t offset, int64_t bytes) | |
e7f7d676 HR |
1278 | { |
1279 | int64_t len; | |
1280 | ||
aa78b825 | 1281 | if (bytes < 0) { |
e7f7d676 HR |
1282 | return -EIO; |
1283 | } | |
1284 | ||
c73ff92c | 1285 | if (!blk_co_is_available(blk)) { |
e7f7d676 HR |
1286 | return -ENOMEDIUM; |
1287 | } | |
1288 | ||
e7f7d676 HR |
1289 | if (offset < 0) { |
1290 | return -EIO; | |
1291 | } | |
1292 | ||
c10c9d96 | 1293 | if (!blk->allow_write_beyond_eof) { |
bd53086e | 1294 | len = bdrv_co_getlength(blk_bs(blk)); |
c10c9d96 KW |
1295 | if (len < 0) { |
1296 | return len; | |
1297 | } | |
1298 | ||
7242db63 | 1299 | if (offset > len || len - offset < bytes) { |
c10c9d96 KW |
1300 | return -EIO; |
1301 | } | |
e7f7d676 HR |
1302 | } |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | ||
ff82b783 SH |
1307 | /* Are we currently in a drained section? */ |
1308 | bool blk_in_drain(BlockBackend *blk) | |
1309 | { | |
1310 | GLOBAL_STATE_CODE(); /* change to IO_OR_GS_CODE(), if necessary */ | |
1311 | return qatomic_read(&blk->quiesce_counter); | |
1312 | } | |
1313 | ||
7f16476f | 1314 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
cf312932 KW |
1315 | static void coroutine_fn blk_wait_while_drained(BlockBackend *blk) |
1316 | { | |
7f16476f KW |
1317 | assert(blk->in_flight > 0); |
1318 | ||
ef80ec50 SH |
1319 | if (qatomic_read(&blk->quiesce_counter) && |
1320 | !qatomic_read(&blk->disable_request_queuing)) { | |
407ae2ae SH |
1321 | /* |
1322 | * Take lock before decrementing in flight counter so main loop thread | |
1323 | * waits for us to enqueue ourselves before it can leave the drained | |
1324 | * section. | |
1325 | */ | |
1326 | qemu_mutex_lock(&blk->queued_requests_lock); | |
7f16476f | 1327 | blk_dec_in_flight(blk); |
407ae2ae | 1328 | qemu_co_queue_wait(&blk->queued_requests, &blk->queued_requests_lock); |
7f16476f | 1329 | blk_inc_in_flight(blk); |
407ae2ae | 1330 | qemu_mutex_unlock(&blk->queued_requests_lock); |
cf312932 KW |
1331 | } |
1332 | } | |
1333 | ||
fbb92b67 | 1334 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
d1d3fc3d AF |
1335 | static int coroutine_fn |
1336 | blk_co_do_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, | |
1337 | QEMUIOVector *qiov, size_t qiov_offset, | |
1338 | BdrvRequestFlags flags) | |
4be74634 | 1339 | { |
1e98fefd | 1340 | int ret; |
cf312932 | 1341 | BlockDriverState *bs; |
1581a70d | 1342 | IO_CODE(); |
1e98fefd | 1343 | |
cf312932 | 1344 | blk_wait_while_drained(blk); |
b9b10c35 | 1345 | GRAPH_RDLOCK_GUARD(); |
1e98fefd | 1346 | |
cf312932 KW |
1347 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1348 | bs = blk_bs(blk); | |
99723548 | 1349 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1350 | |
1351 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1352 | if (ret < 0) { |
1353 | return ret; | |
1354 | } | |
1355 | ||
99723548 PB |
1356 | bdrv_inc_in_flight(bs); |
1357 | ||
441565b2 | 1358 | /* throttling disk I/O */ |
022cdc9f MP |
1359 | if (blk->public.throttle_group_member.throttle_state) { |
1360 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
3b2337ef | 1361 | bytes, THROTTLE_READ); |
441565b2 KW |
1362 | } |
1363 | ||
d1d3fc3d AF |
1364 | ret = bdrv_co_preadv_part(blk->root, offset, bytes, qiov, qiov_offset, |
1365 | flags); | |
99723548 PB |
1366 | bdrv_dec_in_flight(bs); |
1367 | return ret; | |
1bf1cbc9 KW |
1368 | } |
1369 | ||
6f675c93 AF |
1370 | int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset, int64_t bytes, |
1371 | void *buf, BdrvRequestFlags flags) | |
1372 | { | |
1373 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1374 | IO_OR_GS_CODE(); | |
1375 | ||
1376 | assert(bytes <= SIZE_MAX); | |
1377 | ||
1378 | return blk_co_preadv(blk, offset, bytes, &qiov, flags); | |
1379 | } | |
1380 | ||
fbb92b67 | 1381 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
95479077 | 1382 | int64_t bytes, QEMUIOVector *qiov, |
fbb92b67 KW |
1383 | BdrvRequestFlags flags) |
1384 | { | |
1385 | int ret; | |
37868b2a | 1386 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1387 | |
1388 | blk_inc_in_flight(blk); | |
d1d3fc3d AF |
1389 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, 0, flags); |
1390 | blk_dec_in_flight(blk); | |
1391 | ||
1392 | return ret; | |
1393 | } | |
1394 | ||
1395 | int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset, | |
1396 | int64_t bytes, QEMUIOVector *qiov, | |
1397 | size_t qiov_offset, BdrvRequestFlags flags) | |
1398 | { | |
1399 | int ret; | |
1400 | IO_OR_GS_CODE(); | |
1401 | ||
1402 | blk_inc_in_flight(blk); | |
1403 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, qiov_offset, flags); | |
fbb92b67 KW |
1404 | blk_dec_in_flight(blk); |
1405 | ||
1406 | return ret; | |
1407 | } | |
1408 | ||
1409 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ | |
07a64aa4 | 1410 | static int coroutine_fn |
70e8775e VSO |
1411 | blk_co_do_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, |
1412 | QEMUIOVector *qiov, size_t qiov_offset, | |
1413 | BdrvRequestFlags flags) | |
a8823a3b | 1414 | { |
bfd18d1e | 1415 | int ret; |
cf312932 | 1416 | BlockDriverState *bs; |
1581a70d | 1417 | IO_CODE(); |
bfd18d1e | 1418 | |
cf312932 | 1419 | blk_wait_while_drained(blk); |
b9b10c35 | 1420 | GRAPH_RDLOCK_GUARD(); |
bfd18d1e | 1421 | |
cf312932 KW |
1422 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1423 | bs = blk_bs(blk); | |
99723548 | 1424 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1425 | |
bfd18d1e | 1426 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1427 | if (ret < 0) { |
1428 | return ret; | |
1429 | } | |
1430 | ||
99723548 | 1431 | bdrv_inc_in_flight(bs); |
441565b2 | 1432 | /* throttling disk I/O */ |
022cdc9f MP |
1433 | if (blk->public.throttle_group_member.throttle_state) { |
1434 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
3b2337ef | 1435 | bytes, THROTTLE_WRITE); |
441565b2 KW |
1436 | } |
1437 | ||
bfd18d1e KW |
1438 | if (!blk->enable_write_cache) { |
1439 | flags |= BDRV_REQ_FUA; | |
1440 | } | |
1441 | ||
b3016864 VSO |
1442 | ret = bdrv_co_pwritev_part(blk->root, offset, bytes, qiov, qiov_offset, |
1443 | flags); | |
99723548 PB |
1444 | bdrv_dec_in_flight(bs); |
1445 | return ret; | |
a8823a3b KW |
1446 | } |
1447 | ||
fbb92b67 | 1448 | int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset, |
34460feb | 1449 | int64_t bytes, |
fbb92b67 KW |
1450 | QEMUIOVector *qiov, size_t qiov_offset, |
1451 | BdrvRequestFlags flags) | |
1452 | { | |
1453 | int ret; | |
37868b2a | 1454 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1455 | |
1456 | blk_inc_in_flight(blk); | |
70e8775e | 1457 | ret = blk_co_do_pwritev_part(blk, offset, bytes, qiov, qiov_offset, flags); |
fbb92b67 KW |
1458 | blk_dec_in_flight(blk); |
1459 | ||
1460 | return ret; | |
1461 | } | |
1462 | ||
6f675c93 AF |
1463 | int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes, |
1464 | const void *buf, BdrvRequestFlags flags) | |
1465 | { | |
1466 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1467 | IO_OR_GS_CODE(); | |
1468 | ||
1469 | assert(bytes <= SIZE_MAX); | |
1470 | ||
1471 | return blk_co_pwritev(blk, offset, bytes, &qiov, flags); | |
1472 | } | |
1473 | ||
b3016864 | 1474 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
34460feb | 1475 | int64_t bytes, QEMUIOVector *qiov, |
b3016864 VSO |
1476 | BdrvRequestFlags flags) |
1477 | { | |
37868b2a | 1478 | IO_OR_GS_CODE(); |
b3016864 VSO |
1479 | return blk_co_pwritev_part(blk, offset, bytes, qiov, 0, flags); |
1480 | } | |
1481 | ||
ff7e261b EGE |
1482 | int coroutine_fn blk_co_block_status_above(BlockBackend *blk, |
1483 | BlockDriverState *base, | |
1484 | int64_t offset, int64_t bytes, | |
1485 | int64_t *pnum, int64_t *map, | |
1486 | BlockDriverState **file) | |
1487 | { | |
1488 | IO_CODE(); | |
7ff9579e | 1489 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1490 | return bdrv_co_block_status_above(blk_bs(blk), base, offset, bytes, pnum, |
1491 | map, file); | |
1492 | } | |
1493 | ||
1494 | int coroutine_fn blk_co_is_allocated_above(BlockBackend *blk, | |
1495 | BlockDriverState *base, | |
1496 | bool include_base, int64_t offset, | |
1497 | int64_t bytes, int64_t *pnum) | |
1498 | { | |
1499 | IO_CODE(); | |
7ff9579e | 1500 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1501 | return bdrv_co_is_allocated_above(blk_bs(blk), base, include_base, offset, |
1502 | bytes, pnum); | |
1503 | } | |
1504 | ||
1bf1cbc9 KW |
1505 | typedef struct BlkRwCo { |
1506 | BlockBackend *blk; | |
1507 | int64_t offset; | |
c060332c | 1508 | void *iobuf; |
1bf1cbc9 KW |
1509 | int ret; |
1510 | BdrvRequestFlags flags; | |
1511 | } BlkRwCo; | |
1512 | ||
720ff280 KW |
1513 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1514 | { | |
0439c5a4 | 1515 | GLOBAL_STATE_CODE(); |
720ff280 KW |
1516 | return bdrv_make_zero(blk->root, flags); |
1517 | } | |
1518 | ||
c90e2a9c | 1519 | void blk_inc_in_flight(BlockBackend *blk) |
33f2a757 | 1520 | { |
37868b2a | 1521 | IO_CODE(); |
d73415a3 | 1522 | qatomic_inc(&blk->in_flight); |
33f2a757 SH |
1523 | } |
1524 | ||
c90e2a9c | 1525 | void blk_dec_in_flight(BlockBackend *blk) |
33f2a757 | 1526 | { |
37868b2a | 1527 | IO_CODE(); |
d73415a3 | 1528 | qatomic_dec(&blk->in_flight); |
cfe29d82 | 1529 | aio_wait_kick(); |
33f2a757 SH |
1530 | } |
1531 | ||
e7f7d676 HR |
1532 | static void error_callback_bh(void *opaque) |
1533 | { | |
1534 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1535 | |
33f2a757 | 1536 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1537 | acb->common.cb(acb->common.opaque, acb->ret); |
1538 | qemu_aio_unref(acb); | |
1539 | } | |
1540 | ||
ca78ecfa PL |
1541 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1542 | BlockCompletionFunc *cb, | |
1543 | void *opaque, int ret) | |
e7f7d676 HR |
1544 | { |
1545 | struct BlockBackendAIOCB *acb; | |
37868b2a | 1546 | IO_CODE(); |
e7f7d676 | 1547 | |
33f2a757 | 1548 | blk_inc_in_flight(blk); |
e7f7d676 | 1549 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1550 | acb->blk = blk; |
e7f7d676 HR |
1551 | acb->ret = ret; |
1552 | ||
46eb6e86 | 1553 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
e4ec5ad4 | 1554 | error_callback_bh, acb); |
e7f7d676 HR |
1555 | return &acb->common; |
1556 | } | |
1557 | ||
57d6a428 KW |
1558 | typedef struct BlkAioEmAIOCB { |
1559 | BlockAIOCB common; | |
1560 | BlkRwCo rwco; | |
a93d81c8 | 1561 | int64_t bytes; |
57d6a428 | 1562 | bool has_returned; |
57d6a428 KW |
1563 | } BlkAioEmAIOCB; |
1564 | ||
1565 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1566 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1567 | }; | |
1568 | ||
1569 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1570 | { | |
57d6a428 KW |
1571 | if (acb->has_returned) { |
1572 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1573 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1574 | qemu_aio_unref(acb); |
1575 | } | |
1576 | } | |
1577 | ||
1578 | static void blk_aio_complete_bh(void *opaque) | |
1579 | { | |
fffb6e12 | 1580 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1581 | assert(acb->has_returned); |
1582 | blk_aio_complete(acb); | |
57d6a428 KW |
1583 | } |
1584 | ||
a93d81c8 VSO |
1585 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, |
1586 | int64_t bytes, | |
c060332c | 1587 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1588 | BdrvRequestFlags flags, |
1589 | BlockCompletionFunc *cb, void *opaque) | |
1590 | { | |
1591 | BlkAioEmAIOCB *acb; | |
1592 | Coroutine *co; | |
1593 | ||
33f2a757 | 1594 | blk_inc_in_flight(blk); |
57d6a428 KW |
1595 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1596 | acb->rwco = (BlkRwCo) { | |
1597 | .blk = blk, | |
1598 | .offset = offset, | |
c060332c | 1599 | .iobuf = iobuf, |
57d6a428 KW |
1600 | .flags = flags, |
1601 | .ret = NOT_DONE, | |
1602 | }; | |
7fa84cd8 | 1603 | acb->bytes = bytes; |
57d6a428 KW |
1604 | acb->has_returned = false; |
1605 | ||
0b8b8753 | 1606 | co = qemu_coroutine_create(co_entry, acb); |
46eb6e86 | 1607 | aio_co_enter(qemu_get_current_aio_context(), co); |
57d6a428 KW |
1608 | |
1609 | acb->has_returned = true; | |
1610 | if (acb->rwco.ret != NOT_DONE) { | |
46eb6e86 | 1611 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
e4ec5ad4 | 1612 | blk_aio_complete_bh, acb); |
57d6a428 KW |
1613 | } |
1614 | ||
1615 | return &acb->common; | |
1616 | } | |
1617 | ||
881a4c55 | 1618 | static void coroutine_fn blk_aio_read_entry(void *opaque) |
57d6a428 KW |
1619 | { |
1620 | BlkAioEmAIOCB *acb = opaque; | |
1621 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1622 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1623 | |
c060332c | 1624 | assert(qiov->size == acb->bytes); |
d1d3fc3d AF |
1625 | rwco->ret = blk_co_do_preadv_part(rwco->blk, rwco->offset, acb->bytes, qiov, |
1626 | 0, rwco->flags); | |
57d6a428 KW |
1627 | blk_aio_complete(acb); |
1628 | } | |
1629 | ||
881a4c55 | 1630 | static void coroutine_fn blk_aio_write_entry(void *opaque) |
57d6a428 KW |
1631 | { |
1632 | BlkAioEmAIOCB *acb = opaque; | |
1633 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1634 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1635 | |
c060332c | 1636 | assert(!qiov || qiov->size == acb->bytes); |
70e8775e VSO |
1637 | rwco->ret = blk_co_do_pwritev_part(rwco->blk, rwco->offset, acb->bytes, |
1638 | qiov, 0, rwco->flags); | |
57d6a428 KW |
1639 | blk_aio_complete(acb); |
1640 | } | |
1641 | ||
d004bd52 | 1642 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
a93d81c8 | 1643 | int64_t bytes, BdrvRequestFlags flags, |
d004bd52 | 1644 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1645 | { |
37868b2a | 1646 | IO_CODE(); |
a93d81c8 | 1647 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_write_entry, |
983a1600 | 1648 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); |
4be74634 MA |
1649 | } |
1650 | ||
c86422c5 | 1651 | int64_t coroutine_fn blk_co_getlength(BlockBackend *blk) |
4be74634 | 1652 | { |
37868b2a | 1653 | IO_CODE(); |
c73ff92c | 1654 | GRAPH_RDLOCK_GUARD(); |
c86422c5 | 1655 | |
c73ff92c | 1656 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1657 | return -ENOMEDIUM; |
1658 | } | |
1659 | ||
c86422c5 | 1660 | return bdrv_co_getlength(blk_bs(blk)); |
4be74634 MA |
1661 | } |
1662 | ||
9ed98cae | 1663 | int64_t coroutine_fn blk_co_nb_sectors(BlockBackend *blk) |
4be74634 | 1664 | { |
e5203a3b PB |
1665 | BlockDriverState *bs = blk_bs(blk); |
1666 | ||
37868b2a | 1667 | IO_CODE(); |
d8fbf9aa KW |
1668 | GRAPH_RDLOCK_GUARD(); |
1669 | ||
e5203a3b | 1670 | if (!bs) { |
9ed98cae | 1671 | return -ENOMEDIUM; |
a46fc9c9 | 1672 | } else { |
9ed98cae | 1673 | return bdrv_co_nb_sectors(bs); |
a46fc9c9 | 1674 | } |
4be74634 MA |
1675 | } |
1676 | ||
81f730d4 PB |
1677 | /* |
1678 | * This wrapper is written by hand because this function is in the hot I/O path, | |
1679 | * via blk_get_geometry. | |
1680 | */ | |
1681 | int64_t coroutine_mixed_fn blk_nb_sectors(BlockBackend *blk) | |
1682 | { | |
1683 | BlockDriverState *bs = blk_bs(blk); | |
1684 | ||
1685 | IO_CODE(); | |
1686 | ||
1687 | if (!bs) { | |
1688 | return -ENOMEDIUM; | |
1689 | } else { | |
1690 | return bdrv_nb_sectors(bs); | |
1691 | } | |
1692 | } | |
1693 | ||
9ed98cae PB |
1694 | /* return 0 as number of sectors if no device present or error */ |
1695 | void coroutine_fn blk_co_get_geometry(BlockBackend *blk, | |
1696 | uint64_t *nb_sectors_ptr) | |
1ef01253 | 1697 | { |
9ed98cae PB |
1698 | int64_t ret = blk_co_nb_sectors(blk); |
1699 | *nb_sectors_ptr = ret < 0 ? 0 : ret; | |
1ef01253 HR |
1700 | } |
1701 | ||
81f730d4 PB |
1702 | /* |
1703 | * This wrapper is written by hand because this function is in the hot I/O path. | |
1704 | */ | |
1705 | void coroutine_mixed_fn blk_get_geometry(BlockBackend *blk, | |
1706 | uint64_t *nb_sectors_ptr) | |
1707 | { | |
1708 | int64_t ret = blk_nb_sectors(blk); | |
1709 | *nb_sectors_ptr = ret < 0 ? 0 : ret; | |
1710 | } | |
1711 | ||
60cb2fa7 EB |
1712 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1713 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1714 | BlockCompletionFunc *cb, void *opaque) | |
1715 | { | |
37868b2a | 1716 | IO_CODE(); |
a93d81c8 | 1717 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1718 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1719 | blk_aio_read_entry, flags, cb, opaque); | |
1720 | } | |
1721 | ||
60cb2fa7 EB |
1722 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1723 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1724 | BlockCompletionFunc *cb, void *opaque) | |
1725 | { | |
37868b2a | 1726 | IO_CODE(); |
73d4a113 | 1727 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1728 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1729 | blk_aio_write_entry, flags, cb, opaque); | |
1730 | } | |
1731 | ||
4be74634 MA |
1732 | void blk_aio_cancel(BlockAIOCB *acb) |
1733 | { | |
0439c5a4 | 1734 | GLOBAL_STATE_CODE(); |
4be74634 MA |
1735 | bdrv_aio_cancel(acb); |
1736 | } | |
1737 | ||
1738 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1739 | { | |
37868b2a | 1740 | IO_CODE(); |
4be74634 MA |
1741 | bdrv_aio_cancel_async(acb); |
1742 | } | |
1743 | ||
fbb92b67 | 1744 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
df02da00 | 1745 | static int coroutine_fn |
70e8775e | 1746 | blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1747 | { |
1581a70d EGE |
1748 | IO_CODE(); |
1749 | ||
cf312932 | 1750 | blk_wait_while_drained(blk); |
26c518ab | 1751 | GRAPH_RDLOCK_GUARD(); |
cf312932 | 1752 | |
c73ff92c | 1753 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1754 | return -ENOMEDIUM; |
1755 | } | |
1756 | ||
48af776a KW |
1757 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1758 | } | |
1759 | ||
df02da00 AF |
1760 | int coroutine_fn blk_co_ioctl(BlockBackend *blk, unsigned long int req, |
1761 | void *buf) | |
48af776a | 1762 | { |
16d36e29 | 1763 | int ret; |
37868b2a | 1764 | IO_OR_GS_CODE(); |
c060332c | 1765 | |
16d36e29 | 1766 | blk_inc_in_flight(blk); |
df02da00 | 1767 | ret = blk_co_do_ioctl(blk, req, buf); |
16d36e29 | 1768 | blk_dec_in_flight(blk); |
48af776a | 1769 | |
16d36e29 | 1770 | return ret; |
48af776a KW |
1771 | } |
1772 | ||
881a4c55 | 1773 | static void coroutine_fn blk_aio_ioctl_entry(void *opaque) |
48af776a KW |
1774 | { |
1775 | BlkAioEmAIOCB *acb = opaque; | |
1776 | BlkRwCo *rwco = &acb->rwco; | |
1777 | ||
70e8775e | 1778 | rwco->ret = blk_co_do_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
c060332c | 1779 | |
48af776a | 1780 | blk_aio_complete(acb); |
4be74634 MA |
1781 | } |
1782 | ||
1783 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1784 | BlockCompletionFunc *cb, void *opaque) | |
1785 | { | |
37868b2a | 1786 | IO_CODE(); |
c060332c | 1787 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1788 | } |
1789 | ||
fbb92b67 | 1790 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1791 | static int coroutine_fn |
70e8775e | 1792 | blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes) |
2bb0dce7 | 1793 | { |
cf312932 | 1794 | int ret; |
1581a70d | 1795 | IO_CODE(); |
cf312932 KW |
1796 | |
1797 | blk_wait_while_drained(blk); | |
9a5a1c62 | 1798 | GRAPH_RDLOCK_GUARD(); |
cf312932 KW |
1799 | |
1800 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1801 | if (ret < 0) { |
1802 | return ret; | |
1803 | } | |
1804 | ||
0b9fd3f4 | 1805 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1806 | } |
1807 | ||
881a4c55 | 1808 | static void coroutine_fn blk_aio_pdiscard_entry(void *opaque) |
564806c5 KW |
1809 | { |
1810 | BlkAioEmAIOCB *acb = opaque; | |
1811 | BlkRwCo *rwco = &acb->rwco; | |
1812 | ||
70e8775e | 1813 | rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes); |
564806c5 KW |
1814 | blk_aio_complete(acb); |
1815 | } | |
1816 | ||
1817 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, | |
a93d81c8 | 1818 | int64_t offset, int64_t bytes, |
564806c5 KW |
1819 | BlockCompletionFunc *cb, void *opaque) |
1820 | { | |
37868b2a | 1821 | IO_CODE(); |
564806c5 KW |
1822 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
1823 | cb, opaque); | |
1824 | } | |
1825 | ||
2800637a VSO |
1826 | int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset, |
1827 | int64_t bytes) | |
fbb92b67 KW |
1828 | { |
1829 | int ret; | |
37868b2a | 1830 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1831 | |
1832 | blk_inc_in_flight(blk); | |
70e8775e | 1833 | ret = blk_co_do_pdiscard(blk, offset, bytes); |
fbb92b67 KW |
1834 | blk_dec_in_flight(blk); |
1835 | ||
1836 | return ret; | |
1837 | } | |
1838 | ||
fbb92b67 | 1839 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1840 | static int coroutine_fn blk_co_do_flush(BlockBackend *blk) |
2bb0dce7 | 1841 | { |
1581a70d | 1842 | IO_CODE(); |
88095349 EGE |
1843 | blk_wait_while_drained(blk); |
1844 | GRAPH_RDLOCK_GUARD(); | |
cf312932 | 1845 | |
c73ff92c | 1846 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1847 | return -ENOMEDIUM; |
1848 | } | |
1849 | ||
f21d96d0 | 1850 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1851 | } |
1852 | ||
881a4c55 | 1853 | static void coroutine_fn blk_aio_flush_entry(void *opaque) |
564806c5 KW |
1854 | { |
1855 | BlkAioEmAIOCB *acb = opaque; | |
1856 | BlkRwCo *rwco = &acb->rwco; | |
1857 | ||
70e8775e | 1858 | rwco->ret = blk_co_do_flush(rwco->blk); |
564806c5 KW |
1859 | blk_aio_complete(acb); |
1860 | } | |
1861 | ||
1862 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
1863 | BlockCompletionFunc *cb, void *opaque) | |
1864 | { | |
37868b2a | 1865 | IO_CODE(); |
564806c5 KW |
1866 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
1867 | } | |
1868 | ||
fbb92b67 KW |
1869 | int coroutine_fn blk_co_flush(BlockBackend *blk) |
1870 | { | |
1871 | int ret; | |
37868b2a | 1872 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1873 | |
1874 | blk_inc_in_flight(blk); | |
70e8775e | 1875 | ret = blk_co_do_flush(blk); |
fbb92b67 KW |
1876 | blk_dec_in_flight(blk); |
1877 | ||
1878 | return ret; | |
1879 | } | |
1880 | ||
6d43eaa3 SL |
1881 | static void coroutine_fn blk_aio_zone_report_entry(void *opaque) |
1882 | { | |
1883 | BlkAioEmAIOCB *acb = opaque; | |
1884 | BlkRwCo *rwco = &acb->rwco; | |
1885 | ||
1886 | rwco->ret = blk_co_zone_report(rwco->blk, rwco->offset, | |
1887 | (unsigned int*)(uintptr_t)acb->bytes, | |
1888 | rwco->iobuf); | |
1889 | blk_aio_complete(acb); | |
1890 | } | |
1891 | ||
1892 | BlockAIOCB *blk_aio_zone_report(BlockBackend *blk, int64_t offset, | |
1893 | unsigned int *nr_zones, | |
1894 | BlockZoneDescriptor *zones, | |
1895 | BlockCompletionFunc *cb, void *opaque) | |
1896 | { | |
1897 | BlkAioEmAIOCB *acb; | |
1898 | Coroutine *co; | |
1899 | IO_CODE(); | |
1900 | ||
1901 | blk_inc_in_flight(blk); | |
1902 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1903 | acb->rwco = (BlkRwCo) { | |
1904 | .blk = blk, | |
1905 | .offset = offset, | |
1906 | .iobuf = zones, | |
1907 | .ret = NOT_DONE, | |
1908 | }; | |
1909 | acb->bytes = (int64_t)(uintptr_t)nr_zones, | |
1910 | acb->has_returned = false; | |
1911 | ||
1912 | co = qemu_coroutine_create(blk_aio_zone_report_entry, acb); | |
0f86afde | 1913 | aio_co_enter(qemu_get_current_aio_context(), co); |
6d43eaa3 SL |
1914 | |
1915 | acb->has_returned = true; | |
1916 | if (acb->rwco.ret != NOT_DONE) { | |
0f86afde | 1917 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
6d43eaa3 SL |
1918 | blk_aio_complete_bh, acb); |
1919 | } | |
1920 | ||
1921 | return &acb->common; | |
1922 | } | |
1923 | ||
1924 | static void coroutine_fn blk_aio_zone_mgmt_entry(void *opaque) | |
1925 | { | |
1926 | BlkAioEmAIOCB *acb = opaque; | |
1927 | BlkRwCo *rwco = &acb->rwco; | |
1928 | ||
1929 | rwco->ret = blk_co_zone_mgmt(rwco->blk, | |
1930 | (BlockZoneOp)(uintptr_t)rwco->iobuf, | |
1931 | rwco->offset, acb->bytes); | |
1932 | blk_aio_complete(acb); | |
1933 | } | |
1934 | ||
1935 | BlockAIOCB *blk_aio_zone_mgmt(BlockBackend *blk, BlockZoneOp op, | |
1936 | int64_t offset, int64_t len, | |
1937 | BlockCompletionFunc *cb, void *opaque) { | |
1938 | BlkAioEmAIOCB *acb; | |
1939 | Coroutine *co; | |
1940 | IO_CODE(); | |
1941 | ||
1942 | blk_inc_in_flight(blk); | |
1943 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1944 | acb->rwco = (BlkRwCo) { | |
1945 | .blk = blk, | |
1946 | .offset = offset, | |
1947 | .iobuf = (void *)(uintptr_t)op, | |
1948 | .ret = NOT_DONE, | |
1949 | }; | |
1950 | acb->bytes = len; | |
1951 | acb->has_returned = false; | |
1952 | ||
1953 | co = qemu_coroutine_create(blk_aio_zone_mgmt_entry, acb); | |
0f86afde | 1954 | aio_co_enter(qemu_get_current_aio_context(), co); |
6d43eaa3 SL |
1955 | |
1956 | acb->has_returned = true; | |
1957 | if (acb->rwco.ret != NOT_DONE) { | |
0f86afde | 1958 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
6d43eaa3 SL |
1959 | blk_aio_complete_bh, acb); |
1960 | } | |
1961 | ||
1962 | return &acb->common; | |
1963 | } | |
1964 | ||
4751d09a SL |
1965 | static void coroutine_fn blk_aio_zone_append_entry(void *opaque) |
1966 | { | |
1967 | BlkAioEmAIOCB *acb = opaque; | |
1968 | BlkRwCo *rwco = &acb->rwco; | |
1969 | ||
1970 | rwco->ret = blk_co_zone_append(rwco->blk, (int64_t *)(uintptr_t)acb->bytes, | |
1971 | rwco->iobuf, rwco->flags); | |
1972 | blk_aio_complete(acb); | |
1973 | } | |
1974 | ||
1975 | BlockAIOCB *blk_aio_zone_append(BlockBackend *blk, int64_t *offset, | |
1976 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1977 | BlockCompletionFunc *cb, void *opaque) { | |
1978 | BlkAioEmAIOCB *acb; | |
1979 | Coroutine *co; | |
1980 | IO_CODE(); | |
1981 | ||
1982 | blk_inc_in_flight(blk); | |
1983 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
1984 | acb->rwco = (BlkRwCo) { | |
1985 | .blk = blk, | |
1986 | .ret = NOT_DONE, | |
1987 | .flags = flags, | |
1988 | .iobuf = qiov, | |
1989 | }; | |
1990 | acb->bytes = (int64_t)(uintptr_t)offset; | |
1991 | acb->has_returned = false; | |
1992 | ||
1993 | co = qemu_coroutine_create(blk_aio_zone_append_entry, acb); | |
0f86afde | 1994 | aio_co_enter(qemu_get_current_aio_context(), co); |
4751d09a SL |
1995 | acb->has_returned = true; |
1996 | if (acb->rwco.ret != NOT_DONE) { | |
0f86afde | 1997 | replay_bh_schedule_oneshot_event(qemu_get_current_aio_context(), |
4751d09a SL |
1998 | blk_aio_complete_bh, acb); |
1999 | } | |
2000 | ||
2001 | return &acb->common; | |
2002 | } | |
2003 | ||
6d43eaa3 SL |
2004 | /* |
2005 | * Send a zone_report command. | |
2006 | * offset is a byte offset from the start of the device. No alignment | |
2007 | * required for offset. | |
2008 | * nr_zones represents IN maximum and OUT actual. | |
2009 | */ | |
2010 | int coroutine_fn blk_co_zone_report(BlockBackend *blk, int64_t offset, | |
2011 | unsigned int *nr_zones, | |
2012 | BlockZoneDescriptor *zones) | |
2013 | { | |
2014 | int ret; | |
2015 | IO_CODE(); | |
2016 | ||
2017 | blk_inc_in_flight(blk); /* increase before waiting */ | |
2018 | blk_wait_while_drained(blk); | |
2019 | GRAPH_RDLOCK_GUARD(); | |
2020 | if (!blk_is_available(blk)) { | |
2021 | blk_dec_in_flight(blk); | |
2022 | return -ENOMEDIUM; | |
2023 | } | |
2024 | ret = bdrv_co_zone_report(blk_bs(blk), offset, nr_zones, zones); | |
2025 | blk_dec_in_flight(blk); | |
2026 | return ret; | |
2027 | } | |
2028 | ||
2029 | /* | |
2030 | * Send a zone_management command. | |
2031 | * op is the zone operation; | |
2032 | * offset is the byte offset from the start of the zoned device; | |
2033 | * len is the maximum number of bytes the command should operate on. It | |
2034 | * should be aligned with the device zone size. | |
2035 | */ | |
2036 | int coroutine_fn blk_co_zone_mgmt(BlockBackend *blk, BlockZoneOp op, | |
2037 | int64_t offset, int64_t len) | |
2038 | { | |
2039 | int ret; | |
2040 | IO_CODE(); | |
2041 | ||
2042 | blk_inc_in_flight(blk); | |
2043 | blk_wait_while_drained(blk); | |
2044 | GRAPH_RDLOCK_GUARD(); | |
2045 | ||
2046 | ret = blk_check_byte_request(blk, offset, len); | |
2047 | if (ret < 0) { | |
2048 | blk_dec_in_flight(blk); | |
2049 | return ret; | |
2050 | } | |
2051 | ||
2052 | ret = bdrv_co_zone_mgmt(blk_bs(blk), op, offset, len); | |
2053 | blk_dec_in_flight(blk); | |
2054 | return ret; | |
2055 | } | |
2056 | ||
4751d09a SL |
2057 | /* |
2058 | * Send a zone_append command. | |
2059 | */ | |
2060 | int coroutine_fn blk_co_zone_append(BlockBackend *blk, int64_t *offset, | |
2061 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
2062 | { | |
2063 | int ret; | |
2064 | IO_CODE(); | |
2065 | ||
2066 | blk_inc_in_flight(blk); | |
2067 | blk_wait_while_drained(blk); | |
2068 | GRAPH_RDLOCK_GUARD(); | |
2069 | if (!blk_is_available(blk)) { | |
2070 | blk_dec_in_flight(blk); | |
2071 | return -ENOMEDIUM; | |
2072 | } | |
2073 | ||
2074 | ret = bdrv_co_zone_append(blk_bs(blk), offset, qiov, flags); | |
2075 | blk_dec_in_flight(blk); | |
2076 | return ret; | |
2077 | } | |
2078 | ||
97b0385a AY |
2079 | void blk_drain(BlockBackend *blk) |
2080 | { | |
33f2a757 | 2081 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2082 | GLOBAL_STATE_CODE(); |
33f2a757 SH |
2083 | |
2084 | if (bs) { | |
1e3552db | 2085 | bdrv_ref(bs); |
33f2a757 SH |
2086 | bdrv_drained_begin(bs); |
2087 | } | |
2088 | ||
2089 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 2090 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
6a8a98a0 | 2091 | qatomic_read(&blk->in_flight) > 0); |
33f2a757 SH |
2092 | |
2093 | if (bs) { | |
2094 | bdrv_drained_end(bs); | |
1e3552db | 2095 | bdrv_unref(bs); |
a46fc9c9 | 2096 | } |
97b0385a AY |
2097 | } |
2098 | ||
4be74634 MA |
2099 | void blk_drain_all(void) |
2100 | { | |
33f2a757 SH |
2101 | BlockBackend *blk = NULL; |
2102 | ||
0439c5a4 EGE |
2103 | GLOBAL_STATE_CODE(); |
2104 | ||
33f2a757 SH |
2105 | bdrv_drain_all_begin(); |
2106 | ||
2107 | while ((blk = blk_all_next(blk)) != NULL) { | |
33f2a757 | 2108 | /* We may have -ENOMEDIUM completions in flight */ |
d5eab432 | 2109 | AIO_WAIT_WHILE_UNLOCKED(NULL, qatomic_read(&blk->in_flight) > 0); |
33f2a757 SH |
2110 | } |
2111 | ||
2112 | bdrv_drain_all_end(); | |
4be74634 MA |
2113 | } |
2114 | ||
373340b2 HR |
2115 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
2116 | BlockdevOnError on_write_error) | |
2117 | { | |
0439c5a4 | 2118 | GLOBAL_STATE_CODE(); |
373340b2 HR |
2119 | blk->on_read_error = on_read_error; |
2120 | blk->on_write_error = on_write_error; | |
2121 | } | |
2122 | ||
4be74634 MA |
2123 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
2124 | { | |
37868b2a | 2125 | IO_CODE(); |
373340b2 | 2126 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
2127 | } |
2128 | ||
2129 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
2130 | int error) | |
2131 | { | |
373340b2 | 2132 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
37868b2a | 2133 | IO_CODE(); |
373340b2 HR |
2134 | |
2135 | switch (on_err) { | |
2136 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2137 | return (error == ENOSPC) ? | |
2138 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
2139 | case BLOCKDEV_ON_ERROR_STOP: | |
2140 | return BLOCK_ERROR_ACTION_STOP; | |
2141 | case BLOCKDEV_ON_ERROR_REPORT: | |
2142 | return BLOCK_ERROR_ACTION_REPORT; | |
2143 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2144 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 2145 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
2146 | default: |
2147 | abort(); | |
2148 | } | |
4be74634 MA |
2149 | } |
2150 | ||
373340b2 HR |
2151 | static void send_qmp_error_event(BlockBackend *blk, |
2152 | BlockErrorAction action, | |
2153 | bool is_read, int error) | |
2154 | { | |
2155 | IoOperationType optype; | |
bfe1a14c | 2156 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
2157 | |
2158 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
54fde4ff | 2159 | qapi_event_send_block_io_error(blk_name(blk), |
bfe1a14c | 2160 | bs ? bdrv_get_node_name(bs) : NULL, optype, |
2bf7e10f | 2161 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 2162 | error == ENOSPC, strerror(error)); |
373340b2 HR |
2163 | } |
2164 | ||
2165 | /* This is done by device models because, while the block layer knows | |
2166 | * about the error, it does not know whether an operation comes from | |
2167 | * the device or the block layer (from a job, for example). | |
2168 | */ | |
4be74634 MA |
2169 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
2170 | bool is_read, int error) | |
2171 | { | |
373340b2 | 2172 | assert(error >= 0); |
37868b2a | 2173 | IO_CODE(); |
373340b2 HR |
2174 | |
2175 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
2176 | /* First set the iostatus, so that "info block" returns an iostatus | |
2177 | * that matches the events raised so far (an additional error iostatus | |
2178 | * is fine, but not a lost one). | |
2179 | */ | |
2180 | blk_iostatus_set_err(blk, error); | |
2181 | ||
2182 | /* Then raise the request to stop the VM and the event. | |
2183 | * qemu_system_vmstop_request_prepare has two effects. First, | |
2184 | * it ensures that the STOP event always comes after the | |
2185 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
2186 | * can observe the STOP event and do a "cont" before the STOP | |
2187 | * event is issued, the VM will not stop. In this case, vm_start() | |
2188 | * also ensures that the STOP/RESUME pair of events is emitted. | |
2189 | */ | |
2190 | qemu_system_vmstop_request_prepare(); | |
2191 | send_qmp_error_event(blk, action, is_read, error); | |
2192 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
2193 | } else { | |
2194 | send_qmp_error_event(blk, action, is_read, error); | |
2195 | } | |
4be74634 MA |
2196 | } |
2197 | ||
86b1cf32 KW |
2198 | /* |
2199 | * Returns true if the BlockBackend can support taking write permissions | |
2200 | * (because its root node is not read-only). | |
2201 | */ | |
2202 | bool blk_supports_write_perm(BlockBackend *blk) | |
4be74634 | 2203 | { |
f21d96d0 | 2204 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2205 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2206 | |
2207 | if (bs) { | |
86b1cf32 | 2208 | return !bdrv_is_read_only(bs); |
061959e8 | 2209 | } else { |
260242a8 | 2210 | return blk->root_state.open_flags & BDRV_O_RDWR; |
061959e8 | 2211 | } |
4be74634 MA |
2212 | } |
2213 | ||
86b1cf32 KW |
2214 | /* |
2215 | * Returns true if the BlockBackend can be written to in its current | |
2216 | * configuration (i.e. if write permission have been requested) | |
2217 | */ | |
2218 | bool blk_is_writable(BlockBackend *blk) | |
2219 | { | |
37868b2a | 2220 | IO_CODE(); |
86b1cf32 KW |
2221 | return blk->perm & BLK_PERM_WRITE; |
2222 | } | |
2223 | ||
96710565 | 2224 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 2225 | { |
f21d96d0 | 2226 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2227 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2228 | |
2229 | if (!bs) { | |
96710565 | 2230 | return false; |
a46fc9c9 HR |
2231 | } |
2232 | ||
f21d96d0 | 2233 | return bdrv_is_sg(bs); |
4be74634 MA |
2234 | } |
2235 | ||
96710565 | 2236 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 2237 | { |
37868b2a | 2238 | IO_CODE(); |
bfd18d1e | 2239 | return blk->enable_write_cache; |
4be74634 MA |
2240 | } |
2241 | ||
2242 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
2243 | { | |
be8da05b | 2244 | IO_CODE(); |
bfd18d1e | 2245 | blk->enable_write_cache = wce; |
4be74634 MA |
2246 | } |
2247 | ||
3b717194 | 2248 | void blk_activate(BlockBackend *blk, Error **errp) |
2bb0dce7 | 2249 | { |
f21d96d0 | 2250 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2251 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2252 | |
2253 | if (!bs) { | |
c09ba36c HR |
2254 | error_setg(errp, "Device '%s' has no medium", blk->name); |
2255 | return; | |
2256 | } | |
2257 | ||
da4afaff KW |
2258 | /* |
2259 | * Migration code can call this function in coroutine context, so leave | |
2260 | * coroutine context if necessary. | |
2261 | */ | |
2262 | if (qemu_in_coroutine()) { | |
2263 | bdrv_co_activate(bs, errp); | |
2264 | } else { | |
2b3912f1 | 2265 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
da4afaff KW |
2266 | bdrv_activate(bs, errp); |
2267 | } | |
2bb0dce7 HR |
2268 | } |
2269 | ||
1e97be91 | 2270 | bool coroutine_fn blk_co_is_inserted(BlockBackend *blk) |
4be74634 | 2271 | { |
f21d96d0 | 2272 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2273 | IO_CODE(); |
c73ff92c | 2274 | assert_bdrv_graph_readable(); |
f21d96d0 | 2275 | |
1e97be91 | 2276 | return bs && bdrv_co_is_inserted(bs); |
db0284f8 HR |
2277 | } |
2278 | ||
c73ff92c | 2279 | bool coroutine_fn blk_co_is_available(BlockBackend *blk) |
db0284f8 | 2280 | { |
37868b2a | 2281 | IO_CODE(); |
c73ff92c | 2282 | return blk_co_is_inserted(blk) && !blk_dev_is_tray_open(blk); |
4be74634 MA |
2283 | } |
2284 | ||
2c75261c | 2285 | void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked) |
4be74634 | 2286 | { |
f21d96d0 | 2287 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2288 | IO_CODE(); |
79a292e5 | 2289 | GRAPH_RDLOCK_GUARD(); |
f21d96d0 KW |
2290 | |
2291 | if (bs) { | |
2c75261c | 2292 | bdrv_co_lock_medium(bs, locked); |
a46fc9c9 | 2293 | } |
4be74634 MA |
2294 | } |
2295 | ||
2531b390 | 2296 | void coroutine_fn blk_co_eject(BlockBackend *blk, bool eject_flag) |
4be74634 | 2297 | { |
f21d96d0 | 2298 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 | 2299 | char *id; |
37868b2a | 2300 | IO_CODE(); |
79a292e5 | 2301 | GRAPH_RDLOCK_GUARD(); |
2d76e724 | 2302 | |
f21d96d0 | 2303 | if (bs) { |
2531b390 | 2304 | bdrv_co_eject(bs, eject_flag); |
a46fc9c9 | 2305 | } |
c47ee043 JS |
2306 | |
2307 | /* Whether or not we ejected on the backend, | |
2308 | * the frontend experienced a tray event. */ | |
2309 | id = blk_get_attached_dev_id(blk); | |
2310 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 2311 | eject_flag); |
c47ee043 | 2312 | g_free(id); |
4be74634 MA |
2313 | } |
2314 | ||
2315 | int blk_get_flags(BlockBackend *blk) | |
2316 | { | |
f21d96d0 | 2317 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2318 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2319 | |
2320 | if (bs) { | |
2321 | return bdrv_get_flags(bs); | |
061959e8 HR |
2322 | } else { |
2323 | return blk->root_state.open_flags; | |
2324 | } | |
4be74634 MA |
2325 | } |
2326 | ||
4841211e EB |
2327 | /* Returns the minimum request alignment, in bytes; guaranteed nonzero */ |
2328 | uint32_t blk_get_request_alignment(BlockBackend *blk) | |
2329 | { | |
2330 | BlockDriverState *bs = blk_bs(blk); | |
37868b2a | 2331 | IO_CODE(); |
4841211e EB |
2332 | return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE; |
2333 | } | |
2334 | ||
24b36e98 PB |
2335 | /* Returns the maximum hardware transfer length, in bytes; guaranteed nonzero */ |
2336 | uint64_t blk_get_max_hw_transfer(BlockBackend *blk) | |
2337 | { | |
2338 | BlockDriverState *bs = blk_bs(blk); | |
2339 | uint64_t max = INT_MAX; | |
37868b2a | 2340 | IO_CODE(); |
24b36e98 PB |
2341 | |
2342 | if (bs) { | |
2343 | max = MIN_NON_ZERO(max, bs->bl.max_hw_transfer); | |
2344 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); | |
2345 | } | |
2346 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); | |
2347 | } | |
2348 | ||
5def6b80 EB |
2349 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
2350 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 2351 | { |
f21d96d0 | 2352 | BlockDriverState *bs = blk_bs(blk); |
b99f7fa0 | 2353 | uint32_t max = INT_MAX; |
37868b2a | 2354 | IO_CODE(); |
f21d96d0 KW |
2355 | |
2356 | if (bs) { | |
b99f7fa0 | 2357 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); |
a46fc9c9 | 2358 | } |
b99f7fa0 | 2359 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); |
454057b7 PL |
2360 | } |
2361 | ||
cc071629 PB |
2362 | int blk_get_max_hw_iov(BlockBackend *blk) |
2363 | { | |
37868b2a | 2364 | IO_CODE(); |
cc071629 PB |
2365 | return MIN_NON_ZERO(blk->root->bs->bl.max_hw_iov, |
2366 | blk->root->bs->bl.max_iov); | |
2367 | } | |
2368 | ||
648296e0 SH |
2369 | int blk_get_max_iov(BlockBackend *blk) |
2370 | { | |
37868b2a | 2371 | IO_CODE(); |
f21d96d0 | 2372 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
2373 | } |
2374 | ||
f1c17521 PB |
2375 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
2376 | { | |
37868b2a | 2377 | IO_CODE(); |
f21d96d0 | 2378 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
2379 | } |
2380 | ||
4be74634 MA |
2381 | void *blk_blockalign(BlockBackend *blk, size_t size) |
2382 | { | |
37868b2a | 2383 | IO_CODE(); |
f21d96d0 | 2384 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
2385 | } |
2386 | ||
2387 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
2388 | { | |
f21d96d0 | 2389 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2390 | GLOBAL_STATE_CODE(); |
277f2007 | 2391 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
f21d96d0 KW |
2392 | |
2393 | if (!bs) { | |
a46fc9c9 HR |
2394 | return false; |
2395 | } | |
2396 | ||
f21d96d0 | 2397 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
2398 | } |
2399 | ||
2400 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
2401 | { | |
f21d96d0 | 2402 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2403 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2404 | |
2405 | if (bs) { | |
2406 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 2407 | } |
4be74634 MA |
2408 | } |
2409 | ||
2410 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
2411 | { | |
f21d96d0 | 2412 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2413 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2414 | |
2415 | if (bs) { | |
2416 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 2417 | } |
4be74634 MA |
2418 | } |
2419 | ||
2420 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
2421 | { | |
f21d96d0 | 2422 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2423 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2424 | |
2425 | if (bs) { | |
2426 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 2427 | } |
4be74634 MA |
2428 | } |
2429 | ||
2430 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
2431 | { | |
dea97c1f | 2432 | BlockDriverState *bs; |
37868b2a | 2433 | IO_CODE(); |
d861ab3a | 2434 | |
dea97c1f KW |
2435 | if (!blk) { |
2436 | return qemu_get_aio_context(); | |
2437 | } | |
2438 | ||
2439 | bs = blk_bs(blk); | |
d861ab3a | 2440 | if (bs) { |
132ada80 KW |
2441 | AioContext *ctx = bdrv_get_aio_context(blk_bs(blk)); |
2442 | assert(ctx == blk->ctx); | |
d861ab3a KW |
2443 | } |
2444 | ||
2445 | return blk->ctx; | |
4981bdec HR |
2446 | } |
2447 | ||
2d196295 SH |
2448 | int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2449 | Error **errp) | |
4be74634 | 2450 | { |
2d196295 | 2451 | bool old_allow_change; |
f21d96d0 | 2452 | BlockDriverState *bs = blk_bs(blk); |
97896a48 | 2453 | int ret; |
f21d96d0 | 2454 | |
2d196295 | 2455 | GLOBAL_STATE_CODE(); |
1e3552db | 2456 | |
2d196295 | 2457 | if (!bs) { |
af5b6ebe | 2458 | blk->ctx = new_context; |
2d196295 | 2459 | return 0; |
a46fc9c9 | 2460 | } |
97896a48 | 2461 | |
2d196295 | 2462 | bdrv_ref(bs); |
4be74634 | 2463 | |
2d196295 SH |
2464 | old_allow_change = blk->allow_aio_context_change; |
2465 | blk->allow_aio_context_change = true; | |
2466 | ||
2467 | ret = bdrv_try_change_aio_context(bs, new_context, NULL, errp); | |
2468 | ||
2469 | blk->allow_aio_context_change = old_allow_change; | |
2470 | ||
2471 | bdrv_unref(bs); | |
2472 | return ret; | |
38475269 KW |
2473 | } |
2474 | ||
33949396 EGE |
2475 | typedef struct BdrvStateBlkRootContext { |
2476 | AioContext *new_ctx; | |
2477 | BlockBackend *blk; | |
2478 | } BdrvStateBlkRootContext; | |
2479 | ||
2480 | static void blk_root_set_aio_ctx_commit(void *opaque) | |
2481 | { | |
2482 | BdrvStateBlkRootContext *s = opaque; | |
2483 | BlockBackend *blk = s->blk; | |
2d196295 SH |
2484 | AioContext *new_context = s->new_ctx; |
2485 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
33949396 | 2486 | |
2d196295 SH |
2487 | blk->ctx = new_context; |
2488 | if (tgm->throttle_state) { | |
2489 | throttle_group_detach_aio_context(tgm); | |
2490 | throttle_group_attach_aio_context(tgm, new_context); | |
2491 | } | |
33949396 EGE |
2492 | } |
2493 | ||
2494 | static TransactionActionDrv set_blk_root_context = { | |
2495 | .commit = blk_root_set_aio_ctx_commit, | |
2496 | .clean = g_free, | |
2497 | }; | |
2498 | ||
2499 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, | |
2500 | GHashTable *visited, Transaction *tran, | |
2501 | Error **errp) | |
38475269 KW |
2502 | { |
2503 | BlockBackend *blk = child->opaque; | |
33949396 | 2504 | BdrvStateBlkRootContext *s; |
38475269 | 2505 | |
33949396 EGE |
2506 | if (!blk->allow_aio_context_change) { |
2507 | /* | |
2508 | * Manually created BlockBackends (those with a name) that are not | |
2509 | * attached to anything can change their AioContext without updating | |
2510 | * their user; return an error for others. | |
2511 | */ | |
2512 | if (!blk->name || blk->dev) { | |
2513 | /* TODO Add BB name/QOM path */ | |
2514 | error_setg(errp, "Cannot change iothread of active block backend"); | |
2515 | return false; | |
2516 | } | |
980b0f94 KW |
2517 | } |
2518 | ||
33949396 EGE |
2519 | s = g_new(BdrvStateBlkRootContext, 1); |
2520 | *s = (BdrvStateBlkRootContext) { | |
2521 | .new_ctx = ctx, | |
2522 | .blk = blk, | |
2523 | }; | |
38475269 | 2524 | |
33949396 | 2525 | tran_add(tran, &set_blk_root_context, s); |
38475269 KW |
2526 | return true; |
2527 | } | |
2528 | ||
2019ba0a HR |
2529 | void blk_add_aio_context_notifier(BlockBackend *blk, |
2530 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
2531 | void (*detach_aio_context)(void *opaque), void *opaque) | |
2532 | { | |
d03654ea | 2533 | BlockBackendAioNotifier *notifier; |
f21d96d0 | 2534 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2535 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2536 | |
d03654ea SH |
2537 | notifier = g_new(BlockBackendAioNotifier, 1); |
2538 | notifier->attached_aio_context = attached_aio_context; | |
2539 | notifier->detach_aio_context = detach_aio_context; | |
2540 | notifier->opaque = opaque; | |
2541 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
2542 | ||
f21d96d0 KW |
2543 | if (bs) { |
2544 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2545 | detach_aio_context, opaque); |
2546 | } | |
2019ba0a HR |
2547 | } |
2548 | ||
2549 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
2550 | void (*attached_aio_context)(AioContext *, | |
2551 | void *), | |
2552 | void (*detach_aio_context)(void *), | |
2553 | void *opaque) | |
2554 | { | |
d03654ea | 2555 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
2556 | BlockDriverState *bs = blk_bs(blk); |
2557 | ||
0439c5a4 EGE |
2558 | GLOBAL_STATE_CODE(); |
2559 | ||
f21d96d0 KW |
2560 | if (bs) { |
2561 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2562 | detach_aio_context, opaque); |
2563 | } | |
d03654ea SH |
2564 | |
2565 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
2566 | if (notifier->attached_aio_context == attached_aio_context && | |
2567 | notifier->detach_aio_context == detach_aio_context && | |
2568 | notifier->opaque == opaque) { | |
2569 | QLIST_REMOVE(notifier, list); | |
2570 | g_free(notifier); | |
2571 | return; | |
2572 | } | |
2573 | } | |
2574 | ||
2575 | abort(); | |
2019ba0a HR |
2576 | } |
2577 | ||
3301f6c6 HR |
2578 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
2579 | { | |
0439c5a4 | 2580 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2581 | notifier_list_add(&blk->remove_bs_notifiers, notify); |
2582 | } | |
2583 | ||
2584 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
2585 | { | |
0439c5a4 | 2586 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2587 | notifier_list_add(&blk->insert_bs_notifiers, notify); |
2588 | } | |
2589 | ||
4be74634 MA |
2590 | BlockAcctStats *blk_get_stats(BlockBackend *blk) |
2591 | { | |
37868b2a | 2592 | IO_CODE(); |
7f0e9da6 | 2593 | return &blk->stats; |
4be74634 MA |
2594 | } |
2595 | ||
2596 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
2597 | BlockCompletionFunc *cb, void *opaque) | |
2598 | { | |
37868b2a | 2599 | IO_CODE(); |
4be74634 MA |
2600 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); |
2601 | } | |
1ef01253 | 2602 | |
d004bd52 | 2603 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
34460feb | 2604 | int64_t bytes, BdrvRequestFlags flags) |
1ef01253 | 2605 | { |
37868b2a | 2606 | IO_OR_GS_CODE(); |
f5a5ca79 | 2607 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 2608 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
2609 | } |
2610 | ||
2c9715fa AF |
2611 | int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset, |
2612 | int64_t bytes, const void *buf) | |
1ef01253 | 2613 | { |
06f0325c | 2614 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |
37868b2a | 2615 | IO_OR_GS_CODE(); |
2c9715fa AF |
2616 | return blk_co_pwritev_part(blk, offset, bytes, &qiov, 0, |
2617 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2618 | } |
2619 | ||
015ed252 AF |
2620 | int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact, |
2621 | PreallocMode prealloc, BdrvRequestFlags flags, | |
2622 | Error **errp) | |
1ef01253 | 2623 | { |
37868b2a | 2624 | IO_OR_GS_CODE(); |
c2b8e315 | 2625 | GRAPH_RDLOCK_GUARD(); |
c73ff92c | 2626 | if (!blk_co_is_available(blk)) { |
ed3d2ec9 | 2627 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2628 | return -ENOMEDIUM; |
2629 | } | |
2630 | ||
015ed252 | 2631 | return bdrv_co_truncate(blk->root, offset, exact, prealloc, flags, errp); |
1ef01253 HR |
2632 | } |
2633 | ||
1ef01253 HR |
2634 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, |
2635 | int64_t pos, int size) | |
2636 | { | |
bfd18d1e | 2637 | int ret; |
0439c5a4 | 2638 | GLOBAL_STATE_CODE(); |
bfd18d1e | 2639 | |
c09ba36c HR |
2640 | if (!blk_is_available(blk)) { |
2641 | return -ENOMEDIUM; | |
2642 | } | |
2643 | ||
bfd18d1e KW |
2644 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2645 | if (ret < 0) { | |
2646 | return ret; | |
2647 | } | |
2648 | ||
2649 | if (ret == size && !blk->enable_write_cache) { | |
2650 | ret = bdrv_flush(blk_bs(blk)); | |
2651 | } | |
2652 | ||
2653 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2654 | } |
2655 | ||
2656 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2657 | { | |
0439c5a4 | 2658 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2659 | if (!blk_is_available(blk)) { |
2660 | return -ENOMEDIUM; | |
2661 | } | |
2662 | ||
f21d96d0 | 2663 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2664 | } |
f0272c4d ET |
2665 | |
2666 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2667 | { | |
0439c5a4 | 2668 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2669 | if (!blk_is_available(blk)) { |
2670 | return -ENOMEDIUM; | |
2671 | } | |
2672 | ||
f21d96d0 | 2673 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2674 | } |
2675 | ||
2676 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2677 | { | |
0439c5a4 | 2678 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2679 | if (!blk_is_available(blk)) { |
2680 | return -ENOMEDIUM; | |
2681 | } | |
2682 | ||
f21d96d0 | 2683 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2684 | } |
281d22d8 HR |
2685 | |
2686 | /* | |
2687 | * Updates the BlockBackendRootState object with data from the currently | |
2688 | * attached BlockDriverState. | |
2689 | */ | |
2690 | void blk_update_root_state(BlockBackend *blk) | |
2691 | { | |
0439c5a4 | 2692 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2693 | assert(blk->root); |
281d22d8 | 2694 | |
f21d96d0 | 2695 | blk->root_state.open_flags = blk->root->bs->open_flags; |
f21d96d0 | 2696 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; |
281d22d8 HR |
2697 | } |
2698 | ||
38cb18f5 | 2699 | /* |
b85114f8 KW |
2700 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2701 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2702 | */ |
b85114f8 | 2703 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2704 | { |
0439c5a4 | 2705 | GLOBAL_STATE_CODE(); |
b85114f8 | 2706 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2707 | } |
2708 | ||
2709 | /* | |
2710 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2711 | * supposed to inherit the root state. | |
2712 | */ | |
2713 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2714 | { | |
0439c5a4 | 2715 | GLOBAL_STATE_CODE(); |
260242a8 | 2716 | return blk->root_state.open_flags; |
38cb18f5 HR |
2717 | } |
2718 | ||
281d22d8 HR |
2719 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2720 | { | |
0439c5a4 | 2721 | GLOBAL_STATE_CODE(); |
281d22d8 HR |
2722 | return &blk->root_state; |
2723 | } | |
1393f212 HR |
2724 | |
2725 | int blk_commit_all(void) | |
2726 | { | |
fe1a9cbc | 2727 | BlockBackend *blk = NULL; |
0439c5a4 | 2728 | GLOBAL_STATE_CODE(); |
fe1a9cbc HR |
2729 | |
2730 | while ((blk = blk_all_next(blk)) != NULL) { | |
2731 | AioContext *aio_context = blk_get_aio_context(blk); | |
9a71b9de | 2732 | BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk)); |
fe1a9cbc HR |
2733 | |
2734 | aio_context_acquire(aio_context); | |
9a71b9de HR |
2735 | if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) { |
2736 | int ret; | |
2737 | ||
2738 | ret = bdrv_commit(unfiltered_bs); | |
fe1a9cbc HR |
2739 | if (ret < 0) { |
2740 | aio_context_release(aio_context); | |
2741 | return ret; | |
2742 | } | |
2743 | } | |
2744 | aio_context_release(aio_context); | |
2745 | } | |
2746 | return 0; | |
2747 | } | |
2748 | ||
97148076 KW |
2749 | |
2750 | /* throttling disk I/O limits */ | |
2751 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2752 | { | |
0439c5a4 | 2753 | GLOBAL_STATE_CODE(); |
022cdc9f | 2754 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2755 | } |
2756 | ||
2757 | void blk_io_limits_disable(BlockBackend *blk) | |
2758 | { | |
48bf7ea8 AG |
2759 | BlockDriverState *bs = blk_bs(blk); |
2760 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2761 | assert(tgm->throttle_state); | |
0439c5a4 | 2762 | GLOBAL_STATE_CODE(); |
48bf7ea8 | 2763 | if (bs) { |
1e3552db | 2764 | bdrv_ref(bs); |
48bf7ea8 AG |
2765 | bdrv_drained_begin(bs); |
2766 | } | |
2767 | throttle_group_unregister_tgm(tgm); | |
2768 | if (bs) { | |
2769 | bdrv_drained_end(bs); | |
1e3552db | 2770 | bdrv_unref(bs); |
48bf7ea8 | 2771 | } |
97148076 KW |
2772 | } |
2773 | ||
2774 | /* should be called before blk_set_io_limits if a limit is set */ | |
2775 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2776 | { | |
022cdc9f | 2777 | assert(!blk->public.throttle_group_member.throttle_state); |
0439c5a4 | 2778 | GLOBAL_STATE_CODE(); |
c61791fc MP |
2779 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2780 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2781 | } |
2782 | ||
2783 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2784 | { | |
0439c5a4 | 2785 | GLOBAL_STATE_CODE(); |
97148076 | 2786 | /* this BB is not part of any group */ |
022cdc9f | 2787 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2788 | return; |
2789 | } | |
2790 | ||
2791 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2792 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2793 | group)) { | |
97148076 KW |
2794 | return; |
2795 | } | |
2796 | ||
2797 | /* need to change the group this bs belong to */ | |
2798 | blk_io_limits_disable(blk); | |
2799 | blk_io_limits_enable(blk, group); | |
2800 | } | |
c2066af0 KW |
2801 | |
2802 | static void blk_root_drained_begin(BdrvChild *child) | |
2803 | { | |
2804 | BlockBackend *blk = child->opaque; | |
d73415a3 | 2805 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
c2066af0 | 2806 | |
c4d5bf99 | 2807 | if (qatomic_fetch_inc(&blk->quiesce_counter) == 0) { |
f4d9cc88 JS |
2808 | if (blk->dev_ops && blk->dev_ops->drained_begin) { |
2809 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2810 | } | |
2811 | } | |
2812 | ||
36fe1331 KW |
2813 | /* Note that blk->root may not be accessible here yet if we are just |
2814 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2815 | ||
d73415a3 SH |
2816 | if (qatomic_fetch_inc(&tgm->io_limits_disabled) == 0) { |
2817 | throttle_group_restart_tgm(tgm); | |
c2066af0 KW |
2818 | } |
2819 | } | |
2820 | ||
fe5258a5 KW |
2821 | static bool blk_root_drained_poll(BdrvChild *child) |
2822 | { | |
2823 | BlockBackend *blk = child->opaque; | |
095cc4d0 | 2824 | bool busy = false; |
c4d5bf99 | 2825 | assert(qatomic_read(&blk->quiesce_counter)); |
095cc4d0 SL |
2826 | |
2827 | if (blk->dev_ops && blk->dev_ops->drained_poll) { | |
2828 | busy = blk->dev_ops->drained_poll(blk->dev_opaque); | |
2829 | } | |
2830 | return busy || !!blk->in_flight; | |
fe5258a5 KW |
2831 | } |
2832 | ||
2f65df6e | 2833 | static void blk_root_drained_end(BdrvChild *child) |
c2066af0 KW |
2834 | { |
2835 | BlockBackend *blk = child->opaque; | |
c4d5bf99 | 2836 | assert(qatomic_read(&blk->quiesce_counter)); |
c2066af0 | 2837 | |
022cdc9f | 2838 | assert(blk->public.throttle_group_member.io_limits_disabled); |
d73415a3 | 2839 | qatomic_dec(&blk->public.throttle_group_member.io_limits_disabled); |
f4d9cc88 | 2840 | |
c4d5bf99 | 2841 | if (qatomic_fetch_dec(&blk->quiesce_counter) == 1) { |
f4d9cc88 JS |
2842 | if (blk->dev_ops && blk->dev_ops->drained_end) { |
2843 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2844 | } | |
407ae2ae SH |
2845 | qemu_mutex_lock(&blk->queued_requests_lock); |
2846 | while (qemu_co_enter_next(&blk->queued_requests, | |
2847 | &blk->queued_requests_lock)) { | |
cf312932 KW |
2848 | /* Resume all queued requests */ |
2849 | } | |
407ae2ae | 2850 | qemu_mutex_unlock(&blk->queued_requests_lock); |
f4d9cc88 | 2851 | } |
c2066af0 | 2852 | } |
23d0ba93 | 2853 | |
f4ec04ba | 2854 | bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp) |
23d0ba93 | 2855 | { |
71038951 SH |
2856 | BlockDriverState *bs = blk_bs(blk); |
2857 | ||
0439c5a4 | 2858 | GLOBAL_STATE_CODE(); |
71038951 SH |
2859 | |
2860 | if (bs) { | |
2861 | return bdrv_register_buf(bs, host, size, errp); | |
2862 | } | |
2863 | return true; | |
23d0ba93 FZ |
2864 | } |
2865 | ||
4f384011 | 2866 | void blk_unregister_buf(BlockBackend *blk, void *host, size_t size) |
23d0ba93 | 2867 | { |
71038951 SH |
2868 | BlockDriverState *bs = blk_bs(blk); |
2869 | ||
0439c5a4 | 2870 | GLOBAL_STATE_CODE(); |
71038951 SH |
2871 | |
2872 | if (bs) { | |
2873 | bdrv_unregister_buf(bs, host, size); | |
2874 | } | |
23d0ba93 | 2875 | } |
b5679fa4 FZ |
2876 | |
2877 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2878 | BlockBackend *blk_out, int64_t off_out, | |
e192179b | 2879 | int64_t bytes, BdrvRequestFlags read_flags, |
67b51fb9 | 2880 | BdrvRequestFlags write_flags) |
b5679fa4 FZ |
2881 | { |
2882 | int r; | |
37868b2a | 2883 | IO_CODE(); |
c73ff92c | 2884 | GRAPH_RDLOCK_GUARD(); |
37868b2a | 2885 | |
b5679fa4 FZ |
2886 | r = blk_check_byte_request(blk_in, off_in, bytes); |
2887 | if (r) { | |
2888 | return r; | |
2889 | } | |
2890 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2891 | if (r) { | |
2892 | return r; | |
2893 | } | |
742bf09b | 2894 | |
b5679fa4 FZ |
2895 | return bdrv_co_copy_range(blk_in->root, off_in, |
2896 | blk_out->root, off_out, | |
67b51fb9 | 2897 | bytes, read_flags, write_flags); |
b5679fa4 | 2898 | } |
5d3b4e99 VSO |
2899 | |
2900 | const BdrvChild *blk_root(BlockBackend *blk) | |
2901 | { | |
0439c5a4 | 2902 | GLOBAL_STATE_CODE(); |
5d3b4e99 VSO |
2903 | return blk->root; |
2904 | } | |
2b7bbdbd HR |
2905 | |
2906 | int blk_make_empty(BlockBackend *blk, Error **errp) | |
2907 | { | |
0439c5a4 | 2908 | GLOBAL_STATE_CODE(); |
0bb79c97 KW |
2909 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
2910 | ||
2b7bbdbd HR |
2911 | if (!blk_is_available(blk)) { |
2912 | error_setg(errp, "No medium inserted"); | |
2913 | return -ENOMEDIUM; | |
2914 | } | |
2915 | ||
2916 | return bdrv_make_empty(blk->root, errp); | |
2917 | } |