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Commit | Line | Data |
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26f54e9a MA |
1 | /* |
2 | * QEMU Block backends | |
3 | * | |
60cb2fa7 | 4 | * Copyright (C) 2014-2016 Red Hat, Inc. |
26f54e9a MA |
5 | * |
6 | * Authors: | |
7 | * Markus Armbruster <armbru@redhat.com>, | |
8 | * | |
9 | * This work is licensed under the terms of the GNU LGPL, version 2.1 | |
10 | * or later. See the COPYING.LIB file in the top-level directory. | |
11 | */ | |
12 | ||
80c71a24 | 13 | #include "qemu/osdep.h" |
26f54e9a MA |
14 | #include "sysemu/block-backend.h" |
15 | #include "block/block_int.h" | |
373340b2 | 16 | #include "block/blockjob.h" |
16d36e29 | 17 | #include "block/coroutines.h" |
281d22d8 | 18 | #include "block/throttle-groups.h" |
13d4ff07 | 19 | #include "hw/qdev-core.h" |
18e46a03 | 20 | #include "sysemu/blockdev.h" |
54d31236 | 21 | #include "sysemu/runstate.h" |
e4ec5ad4 | 22 | #include "sysemu/replay.h" |
e688df6b | 23 | #include "qapi/error.h" |
9af23989 | 24 | #include "qapi/qapi-events-block.h" |
f348b6d1 | 25 | #include "qemu/id.h" |
db725815 | 26 | #include "qemu/main-loop.h" |
922a01a0 | 27 | #include "qemu/option.h" |
1e98fefd | 28 | #include "trace.h" |
5f7772c4 | 29 | #include "migration/misc.h" |
a7f53e26 MA |
30 | |
31 | /* Number of coroutines to reserve per attached device model */ | |
32 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 33 | |
1bf1cbc9 KW |
34 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
35 | ||
4981bdec HR |
36 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
37 | ||
d03654ea SH |
38 | typedef struct BlockBackendAioNotifier { |
39 | void (*attached_aio_context)(AioContext *new_context, void *opaque); | |
40 | void (*detach_aio_context)(void *opaque); | |
41 | void *opaque; | |
42 | QLIST_ENTRY(BlockBackendAioNotifier) list; | |
43 | } BlockBackendAioNotifier; | |
44 | ||
26f54e9a MA |
45 | struct BlockBackend { |
46 | char *name; | |
47 | int refcnt; | |
f21d96d0 | 48 | BdrvChild *root; |
d861ab3a | 49 | AioContext *ctx; |
26f8b3a8 | 50 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 51 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 52 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 53 | BlockBackendPublic public; |
a7f53e26 | 54 | |
d09ea2d2 | 55 | DeviceState *dev; /* attached device model, if any */ |
a7f53e26 MA |
56 | const BlockDevOps *dev_ops; |
57 | void *dev_opaque; | |
68e9ec01 | 58 | |
281d22d8 HR |
59 | /* If the BDS tree is removed, some of its options are stored here (which |
60 | * can be used to restore those options in the new BDS on insert) */ | |
61 | BlockBackendRootState root_state; | |
62 | ||
bfd18d1e KW |
63 | bool enable_write_cache; |
64 | ||
7f0e9da6 HR |
65 | /* I/O stats (display with "info blockstats"). */ |
66 | BlockAcctStats stats; | |
373340b2 HR |
67 | |
68 | BlockdevOnError on_read_error, on_write_error; | |
69 | bool iostatus_enabled; | |
70 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 71 | |
981776b3 KW |
72 | uint64_t perm; |
73 | uint64_t shared_perm; | |
d35ff5e6 | 74 | bool disable_perm; |
981776b3 | 75 | |
980b0f94 | 76 | bool allow_aio_context_change; |
c10c9d96 KW |
77 | bool allow_write_beyond_eof; |
78 | ||
a2c4c3b1 | 79 | /* Protected by BQL */ |
3301f6c6 | 80 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
d03654ea | 81 | QLIST_HEAD(, BlockBackendAioNotifier) aio_notifiers; |
f4d9cc88 JS |
82 | |
83 | int quiesce_counter; | |
cf312932 KW |
84 | CoQueue queued_requests; |
85 | bool disable_request_queuing; | |
86 | ||
5f7772c4 | 87 | VMChangeStateEntry *vmsh; |
ca2e2144 | 88 | bool force_allow_inactivate; |
33f2a757 SH |
89 | |
90 | /* Number of in-flight aio requests. BlockDriverState also counts | |
91 | * in-flight requests but aio requests can exist even when blk->root is | |
92 | * NULL, so we cannot rely on its counter for that case. | |
93 | * Accessed with atomic ops. | |
94 | */ | |
95 | unsigned int in_flight; | |
26f54e9a MA |
96 | }; |
97 | ||
e7f7d676 HR |
98 | typedef struct BlockBackendAIOCB { |
99 | BlockAIOCB common; | |
4981bdec | 100 | BlockBackend *blk; |
e7f7d676 HR |
101 | int ret; |
102 | } BlockBackendAIOCB; | |
103 | ||
104 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 105 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
106 | .aiocb_size = sizeof(BlockBackendAIOCB), |
107 | }; | |
108 | ||
8fb3c76c | 109 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 110 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
8fb3c76c | 111 | |
a2c4c3b1 | 112 | /* All BlockBackends. Protected by BQL. */ |
2cf22d6a HR |
113 | static QTAILQ_HEAD(, BlockBackend) block_backends = |
114 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
115 | ||
a2c4c3b1 EGE |
116 | /* |
117 | * All BlockBackends referenced by the monitor and which are iterated through by | |
118 | * blk_next(). Protected by BQL. | |
119 | */ | |
9492b0b9 HR |
120 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = |
121 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 122 | |
3cdc69d3 | 123 | static void blk_root_inherit_options(BdrvChildRole role, bool parent_is_format, |
272c02ea | 124 | int *child_flags, QDict *child_options, |
f21d96d0 KW |
125 | int parent_flags, QDict *parent_options) |
126 | { | |
127 | /* We're not supposed to call this function for root nodes */ | |
128 | abort(); | |
129 | } | |
c2066af0 | 130 | static void blk_root_drained_begin(BdrvChild *child); |
fe5258a5 | 131 | static bool blk_root_drained_poll(BdrvChild *child); |
2f65df6e | 132 | static void blk_root_drained_end(BdrvChild *child); |
f21d96d0 | 133 | |
5c8cab48 KW |
134 | static void blk_root_change_media(BdrvChild *child, bool load); |
135 | static void blk_root_resize(BdrvChild *child); | |
136 | ||
33949396 EGE |
137 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
138 | GHashTable *visited, Transaction *tran, | |
139 | Error **errp); | |
38475269 | 140 | |
b5411555 KW |
141 | static char *blk_root_get_parent_desc(BdrvChild *child) |
142 | { | |
143 | BlockBackend *blk = child->opaque; | |
fd240a18 | 144 | g_autofree char *dev_id = NULL; |
b5411555 KW |
145 | |
146 | if (blk->name) { | |
fd240a18 | 147 | return g_strdup_printf("block device '%s'", blk->name); |
b5411555 KW |
148 | } |
149 | ||
150 | dev_id = blk_get_attached_dev_id(blk); | |
151 | if (*dev_id) { | |
fd240a18 | 152 | return g_strdup_printf("block device '%s'", dev_id); |
b5411555 KW |
153 | } else { |
154 | /* TODO Callback into the BB owner for something more detailed */ | |
fd240a18 | 155 | return g_strdup("an unnamed block device"); |
b5411555 KW |
156 | } |
157 | } | |
158 | ||
4c265bf9 KW |
159 | static const char *blk_root_get_name(BdrvChild *child) |
160 | { | |
161 | return blk_name(child->opaque); | |
162 | } | |
163 | ||
538f0497 | 164 | static void blk_vm_state_changed(void *opaque, bool running, RunState state) |
5f7772c4 FZ |
165 | { |
166 | Error *local_err = NULL; | |
167 | BlockBackend *blk = opaque; | |
168 | ||
169 | if (state == RUN_STATE_INMIGRATE) { | |
170 | return; | |
171 | } | |
172 | ||
173 | qemu_del_vm_change_state_handler(blk->vmsh); | |
174 | blk->vmsh = NULL; | |
175 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
176 | if (local_err) { | |
177 | error_report_err(local_err); | |
178 | } | |
179 | } | |
180 | ||
4417ab7a KW |
181 | /* |
182 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
183 | * devices can tighten their permissions in response (specifically revoke | |
184 | * shared write permissions that we needed for storage migration). | |
185 | * | |
186 | * If an error is returned, the VM cannot be allowed to be resumed. | |
187 | */ | |
188 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
189 | { | |
190 | BlockBackend *blk = child->opaque; | |
191 | Error *local_err = NULL; | |
492a1196 | 192 | uint64_t saved_shared_perm; |
4417ab7a KW |
193 | |
194 | if (!blk->disable_perm) { | |
195 | return; | |
196 | } | |
197 | ||
198 | blk->disable_perm = false; | |
199 | ||
492a1196 HR |
200 | /* |
201 | * blk->shared_perm contains the permissions we want to share once | |
202 | * migration is really completely done. For now, we need to share | |
203 | * all; but we also need to retain blk->shared_perm, which is | |
204 | * overwritten by a successful blk_set_perm() call. Save it and | |
205 | * restore it below. | |
206 | */ | |
207 | saved_shared_perm = blk->shared_perm; | |
208 | ||
5f7772c4 FZ |
209 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
210 | if (local_err) { | |
211 | error_propagate(errp, local_err); | |
212 | blk->disable_perm = true; | |
213 | return; | |
214 | } | |
492a1196 | 215 | blk->shared_perm = saved_shared_perm; |
5f7772c4 FZ |
216 | |
217 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
218 | /* Activation can happen when migration process is still active, for | |
219 | * example when nbd_server_add is called during non-shared storage | |
220 | * migration. Defer the shared_perm update to migration completion. */ | |
221 | if (!blk->vmsh) { | |
222 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
223 | blk); | |
224 | } | |
225 | return; | |
226 | } | |
227 | ||
4417ab7a KW |
228 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
229 | if (local_err) { | |
230 | error_propagate(errp, local_err); | |
231 | blk->disable_perm = true; | |
232 | return; | |
233 | } | |
234 | } | |
235 | ||
ca2e2144 FZ |
236 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
237 | { | |
0439c5a4 | 238 | GLOBAL_STATE_CODE(); |
ca2e2144 FZ |
239 | blk->force_allow_inactivate = true; |
240 | } | |
241 | ||
c16de8f5 FZ |
242 | static bool blk_can_inactivate(BlockBackend *blk) |
243 | { | |
ca2e2144 | 244 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
245 | if (blk->dev || blk_name(blk)[0]) { |
246 | return true; | |
247 | } | |
248 | ||
ca2e2144 FZ |
249 | /* Inactivating means no more writes to the image can be done, |
250 | * even if those writes would be changes invisible to the | |
251 | * guest. For block job BBs that satisfy this, we can just allow | |
252 | * it. This is the case for mirror job source, which is required | |
253 | * by libvirt non-shared block migration. */ | |
254 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
255 | return true; | |
256 | } | |
257 | ||
258 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
259 | } |
260 | ||
cfa1a572 KW |
261 | static int blk_root_inactivate(BdrvChild *child) |
262 | { | |
263 | BlockBackend *blk = child->opaque; | |
264 | ||
265 | if (blk->disable_perm) { | |
266 | return 0; | |
267 | } | |
268 | ||
c16de8f5 | 269 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
270 | return -EPERM; |
271 | } | |
272 | ||
273 | blk->disable_perm = true; | |
274 | if (blk->root) { | |
275 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
276 | } | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
d03654ea SH |
281 | static void blk_root_attach(BdrvChild *child) |
282 | { | |
283 | BlockBackend *blk = child->opaque; | |
284 | BlockBackendAioNotifier *notifier; | |
285 | ||
286 | trace_blk_root_attach(child, blk, child->bs); | |
287 | ||
288 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
289 | bdrv_add_aio_context_notifier(child->bs, | |
290 | notifier->attached_aio_context, | |
291 | notifier->detach_aio_context, | |
292 | notifier->opaque); | |
293 | } | |
294 | } | |
295 | ||
296 | static void blk_root_detach(BdrvChild *child) | |
297 | { | |
298 | BlockBackend *blk = child->opaque; | |
299 | BlockBackendAioNotifier *notifier; | |
300 | ||
301 | trace_blk_root_detach(child, blk, child->bs); | |
302 | ||
303 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
304 | bdrv_remove_aio_context_notifier(child->bs, | |
305 | notifier->attached_aio_context, | |
306 | notifier->detach_aio_context, | |
307 | notifier->opaque); | |
308 | } | |
309 | } | |
310 | ||
3ca1f322 VSO |
311 | static AioContext *blk_root_get_parent_aio_context(BdrvChild *c) |
312 | { | |
313 | BlockBackend *blk = c->opaque; | |
d5f8d79c | 314 | IO_CODE(); |
3ca1f322 VSO |
315 | |
316 | return blk_get_aio_context(blk); | |
317 | } | |
318 | ||
bd86fb99 | 319 | static const BdrvChildClass child_root = { |
c2066af0 KW |
320 | .inherit_options = blk_root_inherit_options, |
321 | ||
5c8cab48 KW |
322 | .change_media = blk_root_change_media, |
323 | .resize = blk_root_resize, | |
4c265bf9 | 324 | .get_name = blk_root_get_name, |
b5411555 | 325 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 326 | |
c2066af0 | 327 | .drained_begin = blk_root_drained_begin, |
fe5258a5 | 328 | .drained_poll = blk_root_drained_poll, |
c2066af0 | 329 | .drained_end = blk_root_drained_end, |
4417ab7a KW |
330 | |
331 | .activate = blk_root_activate, | |
cfa1a572 | 332 | .inactivate = blk_root_inactivate, |
d03654ea SH |
333 | |
334 | .attach = blk_root_attach, | |
335 | .detach = blk_root_detach, | |
38475269 | 336 | |
33949396 | 337 | .change_aio_ctx = blk_root_change_aio_ctx, |
3ca1f322 VSO |
338 | |
339 | .get_parent_aio_context = blk_root_get_parent_aio_context, | |
f21d96d0 KW |
340 | }; |
341 | ||
26f54e9a | 342 | /* |
efaa7c4e | 343 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
344 | * |
345 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
346 | * to request for a block driver node that is attached to this BlockBackend. | |
347 | * @shared_perm is a bitmask which describes which permissions may be granted | |
348 | * to other users of the attached node. | |
349 | * Both sets of permissions can be changed later using blk_set_perm(). | |
350 | * | |
26f54e9a MA |
351 | * Return the new BlockBackend on success, null on failure. |
352 | */ | |
d861ab3a | 353 | BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
354 | { |
355 | BlockBackend *blk; | |
356 | ||
0439c5a4 EGE |
357 | GLOBAL_STATE_CODE(); |
358 | ||
26f54e9a | 359 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 360 | blk->refcnt = 1; |
d861ab3a | 361 | blk->ctx = ctx; |
6d0eb64d KW |
362 | blk->perm = perm; |
363 | blk->shared_perm = shared_perm; | |
0c3169df KW |
364 | blk_set_enable_write_cache(blk, true); |
365 | ||
cb53460b KW |
366 | blk->on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
367 | blk->on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
368 | ||
9caa6f3d | 369 | block_acct_init(&blk->stats); |
27ccdd52 | 370 | |
cf312932 | 371 | qemu_co_queue_init(&blk->queued_requests); |
3301f6c6 HR |
372 | notifier_list_init(&blk->remove_bs_notifiers); |
373 | notifier_list_init(&blk->insert_bs_notifiers); | |
d03654ea | 374 | QLIST_INIT(&blk->aio_notifiers); |
27ccdd52 | 375 | |
2cf22d6a | 376 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
377 | return blk; |
378 | } | |
379 | ||
a3aeeab5 EB |
380 | /* |
381 | * Create a new BlockBackend connected to an existing BlockDriverState. | |
382 | * | |
383 | * @perm is a bitmasks of BLK_PERM_* constants which describes the | |
384 | * permissions to request for @bs that is attached to this | |
385 | * BlockBackend. @shared_perm is a bitmask which describes which | |
386 | * permissions may be granted to other users of the attached node. | |
387 | * Both sets of permissions can be changed later using blk_set_perm(). | |
388 | * | |
389 | * Return the new BlockBackend on success, null on failure. | |
390 | */ | |
391 | BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm, | |
392 | uint64_t shared_perm, Error **errp) | |
393 | { | |
394 | BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm); | |
395 | ||
0439c5a4 EGE |
396 | GLOBAL_STATE_CODE(); |
397 | ||
a3aeeab5 EB |
398 | if (blk_insert_bs(blk, bs, errp) < 0) { |
399 | blk_unref(blk); | |
400 | return NULL; | |
401 | } | |
402 | return blk; | |
403 | } | |
404 | ||
7e7d56d9 | 405 | /* |
28eb9b12 | 406 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
d861ab3a | 407 | * The new BlockBackend is in the main AioContext. |
ca49a4fd HR |
408 | * |
409 | * Just as with bdrv_open(), after having called this function the reference to | |
410 | * @options belongs to the block layer (even on failure). | |
411 | * | |
412 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
413 | * BDS tree just by specifying the @options QDict (or @reference, | |
414 | * alternatively). At the time of adding this function, this is not possible, | |
415 | * though, so callers of this function have to be able to specify @filename and | |
416 | * @flags. | |
417 | */ | |
efaa7c4e HR |
418 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
419 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
420 | { |
421 | BlockBackend *blk; | |
28eb9b12 | 422 | BlockDriverState *bs; |
1f4ad7d3 | 423 | uint64_t perm = 0; |
35b7f4ab | 424 | uint64_t shared = BLK_PERM_ALL; |
c62d32f5 | 425 | |
0439c5a4 EGE |
426 | GLOBAL_STATE_CODE(); |
427 | ||
35b7f4ab KW |
428 | /* |
429 | * blk_new_open() is mainly used in .bdrv_create implementations and the | |
430 | * tools where sharing isn't a major concern because the BDS stays private | |
431 | * and the file is generally not supposed to be used by a second process, | |
432 | * so we just request permission according to the flags. | |
c62d32f5 KW |
433 | * |
434 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
435 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
436 | * shouldn't hurt either. We can still share everything here because the | |
35b7f4ab KW |
437 | * guest devices will add their own blockers if they can't share. |
438 | */ | |
1f4ad7d3 KW |
439 | if ((flags & BDRV_O_NO_IO) == 0) { |
440 | perm |= BLK_PERM_CONSISTENT_READ; | |
441 | if (flags & BDRV_O_RDWR) { | |
442 | perm |= BLK_PERM_WRITE; | |
443 | } | |
c62d32f5 KW |
444 | } |
445 | if (flags & BDRV_O_RESIZE) { | |
446 | perm |= BLK_PERM_RESIZE; | |
447 | } | |
35b7f4ab KW |
448 | if (flags & BDRV_O_NO_SHARE) { |
449 | shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; | |
450 | } | |
ca49a4fd | 451 | |
35b7f4ab | 452 | blk = blk_new(qemu_get_aio_context(), perm, shared); |
5b363937 HR |
453 | bs = bdrv_open(filename, reference, options, flags, errp); |
454 | if (!bs) { | |
ca49a4fd HR |
455 | blk_unref(blk); |
456 | return NULL; | |
457 | } | |
458 | ||
1f38f04e HR |
459 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
460 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
35b7f4ab | 461 | perm, shared, blk, errp); |
50bfbe93 | 462 | if (!blk->root) { |
50bfbe93 FZ |
463 | blk_unref(blk); |
464 | return NULL; | |
465 | } | |
72e775c7 | 466 | |
ca49a4fd HR |
467 | return blk; |
468 | } | |
469 | ||
26f54e9a MA |
470 | static void blk_delete(BlockBackend *blk) |
471 | { | |
472 | assert(!blk->refcnt); | |
e5e78550 | 473 | assert(!blk->name); |
a7f53e26 | 474 | assert(!blk->dev); |
022cdc9f | 475 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
476 | blk_io_limits_disable(blk); |
477 | } | |
f21d96d0 | 478 | if (blk->root) { |
13855c6b | 479 | blk_remove_bs(blk); |
7e7d56d9 | 480 | } |
5f7772c4 FZ |
481 | if (blk->vmsh) { |
482 | qemu_del_vm_change_state_handler(blk->vmsh); | |
483 | blk->vmsh = NULL; | |
484 | } | |
3301f6c6 HR |
485 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
486 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 487 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
2cf22d6a | 488 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 489 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 490 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
491 | g_free(blk); |
492 | } | |
493 | ||
8fb3c76c MA |
494 | static void drive_info_del(DriveInfo *dinfo) |
495 | { | |
496 | if (!dinfo) { | |
497 | return; | |
498 | } | |
499 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
500 | g_free(dinfo); |
501 | } | |
502 | ||
f636ae85 AG |
503 | int blk_get_refcnt(BlockBackend *blk) |
504 | { | |
0439c5a4 | 505 | GLOBAL_STATE_CODE(); |
f636ae85 AG |
506 | return blk ? blk->refcnt : 0; |
507 | } | |
508 | ||
26f54e9a MA |
509 | /* |
510 | * Increment @blk's reference count. | |
511 | * @blk must not be null. | |
512 | */ | |
513 | void blk_ref(BlockBackend *blk) | |
514 | { | |
5ca9d21b | 515 | assert(blk->refcnt > 0); |
0439c5a4 | 516 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
517 | blk->refcnt++; |
518 | } | |
519 | ||
520 | /* | |
521 | * Decrement @blk's reference count. | |
522 | * If this drops it to zero, destroy @blk. | |
523 | * For convenience, do nothing if @blk is null. | |
524 | */ | |
525 | void blk_unref(BlockBackend *blk) | |
526 | { | |
0439c5a4 | 527 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
528 | if (blk) { |
529 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
530 | if (blk->refcnt > 1) { |
531 | blk->refcnt--; | |
532 | } else { | |
533 | blk_drain(blk); | |
534 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
535 | assert(blk->refcnt == 1); | |
536 | blk->refcnt = 0; | |
26f54e9a MA |
537 | blk_delete(blk); |
538 | } | |
539 | } | |
540 | } | |
541 | ||
2cf22d6a HR |
542 | /* |
543 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
544 | * ones which are hidden (i.e. are not referenced by the monitor). | |
545 | */ | |
a429b9b5 | 546 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a | 547 | { |
0439c5a4 | 548 | GLOBAL_STATE_CODE(); |
2cf22d6a HR |
549 | return blk ? QTAILQ_NEXT(blk, link) |
550 | : QTAILQ_FIRST(&block_backends); | |
551 | } | |
552 | ||
d8da3cef HR |
553 | void blk_remove_all_bs(void) |
554 | { | |
74d1b8fc | 555 | BlockBackend *blk = NULL; |
d8da3cef | 556 | |
0439c5a4 EGE |
557 | GLOBAL_STATE_CODE(); |
558 | ||
2cf22d6a | 559 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
560 | AioContext *ctx = blk_get_aio_context(blk); |
561 | ||
562 | aio_context_acquire(ctx); | |
f21d96d0 | 563 | if (blk->root) { |
d8da3cef HR |
564 | blk_remove_bs(blk); |
565 | } | |
566 | aio_context_release(ctx); | |
567 | } | |
568 | } | |
569 | ||
26f54e9a | 570 | /* |
9492b0b9 | 571 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
572 | * If @blk is null, return the first one. |
573 | * Else, return @blk's next sibling, which may be null. | |
574 | * | |
575 | * To iterate over all BlockBackends, do | |
576 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
577 | * ... | |
578 | * } | |
579 | */ | |
580 | BlockBackend *blk_next(BlockBackend *blk) | |
581 | { | |
0439c5a4 | 582 | GLOBAL_STATE_CODE(); |
9492b0b9 HR |
583 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
584 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
585 | } |
586 | ||
7c8eece4 KW |
587 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
588 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 589 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 590 | { |
5e003f17 HR |
591 | BlockDriverState *bs, *old_bs; |
592 | ||
593 | /* Must be called from the main loop */ | |
594 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 595 | |
7c8eece4 KW |
596 | /* First, return all root nodes of BlockBackends. In order to avoid |
597 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
598 | * if the BB is the first one in the parent list of the BDS. */ | |
599 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
600 | BlockBackend *old_blk = it->blk; |
601 | ||
602 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
603 | ||
7c8eece4 KW |
604 | do { |
605 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
606 | bs = it->blk ? blk_bs(it->blk) : NULL; |
607 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 608 | |
5e003f17 HR |
609 | if (it->blk) { |
610 | blk_ref(it->blk); | |
611 | } | |
612 | blk_unref(old_blk); | |
613 | ||
88be7b4b | 614 | if (bs) { |
5e003f17 HR |
615 | bdrv_ref(bs); |
616 | bdrv_unref(old_bs); | |
88be7b4b | 617 | return bs; |
7c8eece4 KW |
618 | } |
619 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
620 | } else { |
621 | old_bs = it->bs; | |
7c8eece4 KW |
622 | } |
623 | ||
624 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
625 | * BDSes that are attached to a BlockBackend here; they have been handled | |
626 | * by the above block already */ | |
981f4f57 | 627 | do { |
7c8eece4 | 628 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
629 | bs = it->bs; |
630 | } while (bs && bdrv_has_blk(bs)); | |
631 | ||
5e003f17 HR |
632 | if (bs) { |
633 | bdrv_ref(bs); | |
634 | } | |
635 | bdrv_unref(old_bs); | |
636 | ||
88be7b4b KW |
637 | return bs; |
638 | } | |
639 | ||
5e003f17 | 640 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
641 | { |
642 | *it = (BdrvNextIterator) { | |
643 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
644 | }; | |
5e003f17 | 645 | } |
981f4f57 | 646 | |
5e003f17 HR |
647 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
648 | { | |
0439c5a4 | 649 | GLOBAL_STATE_CODE(); |
5e003f17 | 650 | bdrv_next_reset(it); |
88be7b4b | 651 | return bdrv_next(it); |
981f4f57 HR |
652 | } |
653 | ||
5e003f17 HR |
654 | /* Must be called when aborting a bdrv_next() iteration before |
655 | * bdrv_next() returns NULL */ | |
656 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
657 | { | |
658 | /* Must be called from the main loop */ | |
659 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
660 | ||
661 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
662 | if (it->blk) { | |
663 | bdrv_unref(blk_bs(it->blk)); | |
664 | blk_unref(it->blk); | |
665 | } | |
666 | } else { | |
667 | bdrv_unref(it->bs); | |
668 | } | |
669 | ||
670 | bdrv_next_reset(it); | |
671 | } | |
672 | ||
e5e78550 HR |
673 | /* |
674 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
675 | * the given @name acting as the handle for the monitor. | |
676 | * Strictly for use by blockdev.c. | |
677 | * | |
678 | * @name must not be null or empty. | |
679 | * | |
680 | * Returns true on success and false on failure. In the latter case, an Error | |
681 | * object is returned through @errp. | |
682 | */ | |
683 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
684 | { | |
685 | assert(!blk->name); | |
686 | assert(name && name[0]); | |
0439c5a4 | 687 | GLOBAL_STATE_CODE(); |
e5e78550 HR |
688 | |
689 | if (!id_wellformed(name)) { | |
690 | error_setg(errp, "Invalid device name"); | |
691 | return false; | |
692 | } | |
693 | if (blk_by_name(name)) { | |
694 | error_setg(errp, "Device with id '%s' already exists", name); | |
695 | return false; | |
696 | } | |
697 | if (bdrv_find_node(name)) { | |
698 | error_setg(errp, | |
699 | "Device name '%s' conflicts with an existing node name", | |
700 | name); | |
701 | return false; | |
702 | } | |
703 | ||
704 | blk->name = g_strdup(name); | |
705 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
706 | return true; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
711 | * Strictly for use by blockdev.c. | |
712 | */ | |
713 | void monitor_remove_blk(BlockBackend *blk) | |
714 | { | |
0439c5a4 EGE |
715 | GLOBAL_STATE_CODE(); |
716 | ||
e5e78550 HR |
717 | if (!blk->name) { |
718 | return; | |
719 | } | |
720 | ||
721 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
722 | g_free(blk->name); | |
723 | blk->name = NULL; | |
724 | } | |
725 | ||
26f54e9a | 726 | /* |
7e7d56d9 | 727 | * Return @blk's name, a non-null string. |
e5e78550 | 728 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 729 | */ |
0731a50f | 730 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 731 | { |
37868b2a | 732 | IO_CODE(); |
e5e78550 | 733 | return blk->name ?: ""; |
26f54e9a MA |
734 | } |
735 | ||
736 | /* | |
737 | * Return the BlockBackend with name @name if it exists, else null. | |
738 | * @name must not be null. | |
739 | */ | |
740 | BlockBackend *blk_by_name(const char *name) | |
741 | { | |
74d1b8fc | 742 | BlockBackend *blk = NULL; |
26f54e9a | 743 | |
0439c5a4 | 744 | GLOBAL_STATE_CODE(); |
26f54e9a | 745 | assert(name); |
74d1b8fc | 746 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
747 | if (!strcmp(name, blk->name)) { |
748 | return blk; | |
749 | } | |
750 | } | |
751 | return NULL; | |
752 | } | |
7e7d56d9 MA |
753 | |
754 | /* | |
755 | * Return the BlockDriverState attached to @blk if any, else null. | |
756 | */ | |
757 | BlockDriverState *blk_bs(BlockBackend *blk) | |
758 | { | |
37868b2a | 759 | IO_CODE(); |
f21d96d0 | 760 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
761 | } |
762 | ||
7c8eece4 | 763 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
764 | { |
765 | BdrvChild *child; | |
bdb73476 EGE |
766 | |
767 | GLOBAL_STATE_CODE(); | |
768 | ||
dde33812 | 769 | QLIST_FOREACH(child, &bs->parents, next_parent) { |
bd86fb99 | 770 | if (child->klass == &child_root) { |
7c8eece4 | 771 | return child->opaque; |
dde33812 KW |
772 | } |
773 | } | |
774 | ||
7c8eece4 KW |
775 | return NULL; |
776 | } | |
777 | ||
778 | /* | |
779 | * Returns true if @bs has an associated BlockBackend. | |
780 | */ | |
781 | bool bdrv_has_blk(BlockDriverState *bs) | |
782 | { | |
0439c5a4 | 783 | GLOBAL_STATE_CODE(); |
7c8eece4 | 784 | return bdrv_first_blk(bs) != NULL; |
dde33812 KW |
785 | } |
786 | ||
b6c1bae5 KW |
787 | /* |
788 | * Returns true if @bs has only BlockBackends as parents. | |
789 | */ | |
790 | bool bdrv_is_root_node(BlockDriverState *bs) | |
791 | { | |
792 | BdrvChild *c; | |
793 | ||
0439c5a4 | 794 | GLOBAL_STATE_CODE(); |
b6c1bae5 | 795 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
bd86fb99 | 796 | if (c->klass != &child_root) { |
b6c1bae5 KW |
797 | return false; |
798 | } | |
799 | } | |
800 | ||
801 | return true; | |
802 | } | |
803 | ||
18e46a03 MA |
804 | /* |
805 | * Return @blk's DriveInfo if any, else null. | |
806 | */ | |
807 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
808 | { | |
c5be7445 | 809 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
810 | return blk->legacy_dinfo; |
811 | } | |
812 | ||
813 | /* | |
814 | * Set @blk's DriveInfo to @dinfo, and return it. | |
815 | * @blk must not have a DriveInfo set already. | |
816 | * No other BlockBackend may have the same DriveInfo set. | |
817 | */ | |
818 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
819 | { | |
820 | assert(!blk->legacy_dinfo); | |
c5be7445 | 821 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
822 | return blk->legacy_dinfo = dinfo; |
823 | } | |
824 | ||
825 | /* | |
826 | * Return the BlockBackend with DriveInfo @dinfo. | |
827 | * It must exist. | |
828 | */ | |
829 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
830 | { | |
74d1b8fc | 831 | BlockBackend *blk = NULL; |
c5be7445 | 832 | GLOBAL_STATE_CODE(); |
18e46a03 | 833 | |
74d1b8fc | 834 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
835 | if (blk->legacy_dinfo == dinfo) { |
836 | return blk; | |
837 | } | |
838 | } | |
839 | abort(); | |
840 | } | |
841 | ||
f2cd875d KW |
842 | /* |
843 | * Returns a pointer to the publicly accessible fields of @blk. | |
844 | */ | |
845 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
846 | { | |
0439c5a4 | 847 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
848 | return &blk->public; |
849 | } | |
850 | ||
851 | /* | |
852 | * Returns a BlockBackend given the associated @public fields. | |
853 | */ | |
854 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
855 | { | |
0439c5a4 | 856 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
857 | return container_of(public, BlockBackend, public); |
858 | } | |
859 | ||
1c95f7e1 HR |
860 | /* |
861 | * Disassociates the currently associated BlockDriverState from @blk. | |
862 | */ | |
863 | void blk_remove_bs(BlockBackend *blk) | |
864 | { | |
c89bcf3a | 865 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
e6cada92 | 866 | BdrvChild *root; |
022cdc9f | 867 | |
0439c5a4 EGE |
868 | GLOBAL_STATE_CODE(); |
869 | ||
3301f6c6 | 870 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 871 | if (tgm->throttle_state) { |
1e3552db SH |
872 | BlockDriverState *bs = blk_bs(blk); |
873 | ||
874 | /* | |
875 | * Take a ref in case blk_bs() changes across bdrv_drained_begin(), for | |
876 | * example, if a temporary filter node is removed by a blockjob. | |
877 | */ | |
878 | bdrv_ref(bs); | |
632a7735 | 879 | bdrv_drained_begin(bs); |
c89bcf3a AG |
880 | throttle_group_detach_aio_context(tgm); |
881 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 882 | bdrv_drained_end(bs); |
1e3552db | 883 | bdrv_unref(bs); |
a5614993 | 884 | } |
1c95f7e1 | 885 | |
7ca7f0f6 KW |
886 | blk_update_root_state(blk); |
887 | ||
f45280cb GK |
888 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
889 | * switch to a completion coroutine later on. Let's drain all I/O here | |
890 | * to avoid that and a potential QEMU crash. | |
891 | */ | |
892 | blk_drain(blk); | |
e6cada92 | 893 | root = blk->root; |
f21d96d0 | 894 | blk->root = NULL; |
e6cada92 | 895 | bdrv_root_unref_child(root); |
1c95f7e1 HR |
896 | } |
897 | ||
0c3c36d6 HR |
898 | /* |
899 | * Associates a new BlockDriverState with @blk. | |
900 | */ | |
d7086422 | 901 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 902 | { |
c89bcf3a | 903 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
0439c5a4 | 904 | GLOBAL_STATE_CODE(); |
b441dc71 | 905 | bdrv_ref(bs); |
1f38f04e HR |
906 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
907 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
228ca37e | 908 | blk->perm, blk->shared_perm, |
1f38f04e | 909 | blk, errp); |
d7086422 KW |
910 | if (blk->root == NULL) { |
911 | return -EPERM; | |
912 | } | |
3301f6c6 HR |
913 | |
914 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
915 | if (tgm->throttle_state) { |
916 | throttle_group_detach_aio_context(tgm); | |
917 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 918 | } |
d7086422 KW |
919 | |
920 | return 0; | |
0c3c36d6 HR |
921 | } |
922 | ||
ed089506 VSO |
923 | /* |
924 | * Change BlockDriverState associated with @blk. | |
925 | */ | |
926 | int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp) | |
927 | { | |
0439c5a4 | 928 | GLOBAL_STATE_CODE(); |
ed089506 VSO |
929 | return bdrv_replace_child_bs(blk->root, new_bs, errp); |
930 | } | |
931 | ||
981776b3 KW |
932 | /* |
933 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
934 | */ | |
935 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
936 | Error **errp) | |
937 | { | |
938 | int ret; | |
0439c5a4 | 939 | GLOBAL_STATE_CODE(); |
981776b3 | 940 | |
d35ff5e6 | 941 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
942 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
943 | if (ret < 0) { | |
944 | return ret; | |
945 | } | |
946 | } | |
947 | ||
948 | blk->perm = perm; | |
949 | blk->shared_perm = shared_perm; | |
950 | ||
951 | return 0; | |
952 | } | |
953 | ||
887354bd KW |
954 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
955 | { | |
0439c5a4 | 956 | GLOBAL_STATE_CODE(); |
887354bd KW |
957 | *perm = blk->perm; |
958 | *shared_perm = blk->shared_perm; | |
959 | } | |
960 | ||
d09ea2d2 TH |
961 | /* |
962 | * Attach device model @dev to @blk. | |
963 | * Return 0 on success, -EBUSY when a device model is attached already. | |
964 | */ | |
965 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
4be74634 | 966 | { |
0439c5a4 | 967 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
968 | if (blk->dev) { |
969 | return -EBUSY; | |
970 | } | |
d35ff5e6 KW |
971 | |
972 | /* While migration is still incoming, we don't need to apply the | |
973 | * permissions of guest device BlockBackends. We might still have a block | |
974 | * job or NBD server writing to the image for storage migration. */ | |
975 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
976 | blk->disable_perm = true; | |
977 | } | |
978 | ||
84ebe375 | 979 | blk_ref(blk); |
a7f53e26 | 980 | blk->dev = dev; |
373340b2 | 981 | blk_iostatus_reset(blk); |
d35ff5e6 | 982 | |
a7f53e26 | 983 | return 0; |
4be74634 MA |
984 | } |
985 | ||
a7f53e26 MA |
986 | /* |
987 | * Detach device model @dev from @blk. | |
988 | * @dev must be currently attached to @blk. | |
989 | */ | |
d09ea2d2 | 990 | void blk_detach_dev(BlockBackend *blk, DeviceState *dev) |
4be74634 | 991 | { |
a7f53e26 | 992 | assert(blk->dev == dev); |
0439c5a4 | 993 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
994 | blk->dev = NULL; |
995 | blk->dev_ops = NULL; | |
996 | blk->dev_opaque = NULL; | |
981776b3 | 997 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 998 | blk_unref(blk); |
4be74634 MA |
999 | } |
1000 | ||
a7f53e26 MA |
1001 | /* |
1002 | * Return the device model attached to @blk if any, else null. | |
1003 | */ | |
d09ea2d2 | 1004 | DeviceState *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 | 1005 | { |
0439c5a4 | 1006 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1007 | return blk->dev; |
1008 | } | |
1009 | ||
2d76e724 KW |
1010 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
1011 | * device attached to the BlockBackend. */ | |
77beef83 | 1012 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 | 1013 | { |
d09ea2d2 | 1014 | DeviceState *dev = blk->dev; |
37868b2a | 1015 | IO_CODE(); |
2d76e724 KW |
1016 | |
1017 | if (!dev) { | |
1018 | return g_strdup(""); | |
1019 | } else if (dev->id) { | |
1020 | return g_strdup(dev->id); | |
1021 | } | |
602414d1 LM |
1022 | |
1023 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
1024 | } |
1025 | ||
1c89e1fa KW |
1026 | /* |
1027 | * Return the BlockBackend which has the device model @dev attached if it | |
1028 | * exists, else null. | |
1029 | * | |
1030 | * @dev must not be null. | |
1031 | */ | |
1032 | BlockBackend *blk_by_dev(void *dev) | |
1033 | { | |
1034 | BlockBackend *blk = NULL; | |
1035 | ||
0439c5a4 EGE |
1036 | GLOBAL_STATE_CODE(); |
1037 | ||
1c89e1fa KW |
1038 | assert(dev != NULL); |
1039 | while ((blk = blk_all_next(blk)) != NULL) { | |
1040 | if (blk->dev == dev) { | |
1041 | return blk; | |
1042 | } | |
1043 | } | |
1044 | return NULL; | |
1045 | } | |
1046 | ||
a7f53e26 MA |
1047 | /* |
1048 | * Set @blk's device model callbacks to @ops. | |
1049 | * @opaque is the opaque argument to pass to the callbacks. | |
1050 | * This is for use by device models. | |
1051 | */ | |
1052 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
1053 | void *opaque) | |
1054 | { | |
0439c5a4 | 1055 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1056 | blk->dev_ops = ops; |
1057 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
1058 | |
1059 | /* Are we currently quiesced? Should we enforce this right now? */ | |
ac1fc3a3 | 1060 | if (blk->quiesce_counter && ops && ops->drained_begin) { |
f4d9cc88 JS |
1061 | ops->drained_begin(opaque); |
1062 | } | |
a7f53e26 MA |
1063 | } |
1064 | ||
1065 | /* | |
1066 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
1067 | * |
1068 | * If @load is true, notify of media load. This action can fail, meaning that | |
1069 | * the medium cannot be loaded. @errp is set then. | |
1070 | * | |
1071 | * If @load is false, notify of media eject. This can never fail. | |
1072 | * | |
a7f53e26 MA |
1073 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
1074 | */ | |
39829a01 | 1075 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 | 1076 | { |
0439c5a4 | 1077 | GLOBAL_STATE_CODE(); |
a7f53e26 | 1078 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { |
f1f57066 | 1079 | bool tray_was_open, tray_is_open; |
39829a01 | 1080 | Error *local_err = NULL; |
a7f53e26 | 1081 | |
f1f57066 | 1082 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
1083 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
1084 | if (local_err) { | |
1085 | assert(load == true); | |
1086 | error_propagate(errp, local_err); | |
1087 | return; | |
1088 | } | |
f1f57066 HR |
1089 | tray_is_open = blk_dev_is_tray_open(blk); |
1090 | ||
1091 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 1092 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 1093 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 1094 | g_free(id); |
a7f53e26 MA |
1095 | } |
1096 | } | |
1097 | } | |
1098 | ||
5c8cab48 KW |
1099 | static void blk_root_change_media(BdrvChild *child, bool load) |
1100 | { | |
39829a01 | 1101 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
1102 | } |
1103 | ||
a7f53e26 MA |
1104 | /* |
1105 | * Does @blk's attached device model have removable media? | |
1106 | * %true if no device model is attached. | |
1107 | */ | |
1108 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
1109 | { | |
b4ad82aa | 1110 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1111 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); |
1112 | } | |
1113 | ||
8f3a73bc HR |
1114 | /* |
1115 | * Does @blk's attached device model have a tray? | |
1116 | */ | |
1117 | bool blk_dev_has_tray(BlockBackend *blk) | |
1118 | { | |
967d7905 | 1119 | IO_CODE(); |
8f3a73bc HR |
1120 | return blk->dev_ops && blk->dev_ops->is_tray_open; |
1121 | } | |
1122 | ||
a7f53e26 MA |
1123 | /* |
1124 | * Notify @blk's attached device model of a media eject request. | |
1125 | * If @force is true, the medium is about to be yanked out forcefully. | |
1126 | */ | |
1127 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1128 | { |
b4ad82aa | 1129 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1130 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1131 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1132 | } | |
4be74634 MA |
1133 | } |
1134 | ||
a7f53e26 MA |
1135 | /* |
1136 | * Does @blk's attached device model have a tray, and is it open? | |
1137 | */ | |
1138 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1139 | { |
967d7905 | 1140 | IO_CODE(); |
8f3a73bc | 1141 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1142 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1143 | } | |
1144 | return false; | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Does @blk's attached device model have the medium locked? | |
1149 | * %false if the device model has no such lock. | |
1150 | */ | |
1151 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1152 | { | |
b4ad82aa | 1153 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1154 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { |
1155 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1156 | } | |
1157 | return false; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Notify @blk's attached device model of a backend size change. | |
1162 | */ | |
5c8cab48 | 1163 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1164 | { |
5c8cab48 KW |
1165 | BlockBackend *blk = child->opaque; |
1166 | ||
a7f53e26 MA |
1167 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1168 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | void blk_iostatus_enable(BlockBackend *blk) | |
1173 | { | |
0439c5a4 | 1174 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1175 | blk->iostatus_enabled = true; |
1176 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1177 | } | |
1178 | ||
1179 | /* The I/O status is only enabled if the drive explicitly | |
1180 | * enables it _and_ the VM is configured to stop on errors */ | |
1181 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1182 | { | |
37868b2a | 1183 | IO_CODE(); |
373340b2 HR |
1184 | return (blk->iostatus_enabled && |
1185 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1186 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1187 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1188 | } | |
1189 | ||
1190 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1191 | { | |
0439c5a4 | 1192 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1193 | return blk->iostatus; |
1194 | } | |
1195 | ||
1196 | void blk_iostatus_disable(BlockBackend *blk) | |
1197 | { | |
0439c5a4 | 1198 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1199 | blk->iostatus_enabled = false; |
1200 | } | |
1201 | ||
1202 | void blk_iostatus_reset(BlockBackend *blk) | |
1203 | { | |
0439c5a4 | 1204 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1205 | if (blk_iostatus_is_enabled(blk)) { |
1206 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
373340b2 HR |
1207 | } |
1208 | } | |
1209 | ||
1210 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1211 | { | |
37868b2a | 1212 | IO_CODE(); |
373340b2 HR |
1213 | assert(blk_iostatus_is_enabled(blk)); |
1214 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1215 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1216 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1217 | } | |
4be74634 MA |
1218 | } |
1219 | ||
c10c9d96 KW |
1220 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1221 | { | |
37868b2a | 1222 | IO_CODE(); |
c10c9d96 KW |
1223 | blk->allow_write_beyond_eof = allow; |
1224 | } | |
1225 | ||
980b0f94 KW |
1226 | void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow) |
1227 | { | |
37868b2a | 1228 | IO_CODE(); |
980b0f94 KW |
1229 | blk->allow_aio_context_change = allow; |
1230 | } | |
1231 | ||
cf312932 KW |
1232 | void blk_set_disable_request_queuing(BlockBackend *blk, bool disable) |
1233 | { | |
37868b2a | 1234 | IO_CODE(); |
cf312932 KW |
1235 | blk->disable_request_queuing = disable; |
1236 | } | |
1237 | ||
c73ff92c EGE |
1238 | static int coroutine_fn GRAPH_RDLOCK |
1239 | blk_check_byte_request(BlockBackend *blk, int64_t offset, int64_t bytes) | |
e7f7d676 HR |
1240 | { |
1241 | int64_t len; | |
1242 | ||
aa78b825 | 1243 | if (bytes < 0) { |
e7f7d676 HR |
1244 | return -EIO; |
1245 | } | |
1246 | ||
c73ff92c | 1247 | if (!blk_co_is_available(blk)) { |
e7f7d676 HR |
1248 | return -ENOMEDIUM; |
1249 | } | |
1250 | ||
e7f7d676 HR |
1251 | if (offset < 0) { |
1252 | return -EIO; | |
1253 | } | |
1254 | ||
c10c9d96 | 1255 | if (!blk->allow_write_beyond_eof) { |
bd53086e | 1256 | len = bdrv_co_getlength(blk_bs(blk)); |
c10c9d96 KW |
1257 | if (len < 0) { |
1258 | return len; | |
1259 | } | |
1260 | ||
7242db63 | 1261 | if (offset > len || len - offset < bytes) { |
c10c9d96 KW |
1262 | return -EIO; |
1263 | } | |
e7f7d676 HR |
1264 | } |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
7f16476f | 1269 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
cf312932 KW |
1270 | static void coroutine_fn blk_wait_while_drained(BlockBackend *blk) |
1271 | { | |
7f16476f KW |
1272 | assert(blk->in_flight > 0); |
1273 | ||
cf312932 | 1274 | if (blk->quiesce_counter && !blk->disable_request_queuing) { |
7f16476f | 1275 | blk_dec_in_flight(blk); |
cf312932 | 1276 | qemu_co_queue_wait(&blk->queued_requests, NULL); |
7f16476f | 1277 | blk_inc_in_flight(blk); |
cf312932 KW |
1278 | } |
1279 | } | |
1280 | ||
fbb92b67 | 1281 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
d1d3fc3d AF |
1282 | static int coroutine_fn |
1283 | blk_co_do_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, | |
1284 | QEMUIOVector *qiov, size_t qiov_offset, | |
1285 | BdrvRequestFlags flags) | |
4be74634 | 1286 | { |
1e98fefd | 1287 | int ret; |
cf312932 | 1288 | BlockDriverState *bs; |
1581a70d | 1289 | IO_CODE(); |
1e98fefd | 1290 | |
cf312932 | 1291 | blk_wait_while_drained(blk); |
b9b10c35 | 1292 | GRAPH_RDLOCK_GUARD(); |
1e98fefd | 1293 | |
cf312932 KW |
1294 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1295 | bs = blk_bs(blk); | |
99723548 | 1296 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1297 | |
1298 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1299 | if (ret < 0) { |
1300 | return ret; | |
1301 | } | |
1302 | ||
99723548 PB |
1303 | bdrv_inc_in_flight(bs); |
1304 | ||
441565b2 | 1305 | /* throttling disk I/O */ |
022cdc9f MP |
1306 | if (blk->public.throttle_group_member.throttle_state) { |
1307 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1308 | bytes, false); | |
441565b2 KW |
1309 | } |
1310 | ||
d1d3fc3d AF |
1311 | ret = bdrv_co_preadv_part(blk->root, offset, bytes, qiov, qiov_offset, |
1312 | flags); | |
99723548 PB |
1313 | bdrv_dec_in_flight(bs); |
1314 | return ret; | |
1bf1cbc9 KW |
1315 | } |
1316 | ||
6f675c93 AF |
1317 | int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset, int64_t bytes, |
1318 | void *buf, BdrvRequestFlags flags) | |
1319 | { | |
1320 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1321 | IO_OR_GS_CODE(); | |
1322 | ||
1323 | assert(bytes <= SIZE_MAX); | |
1324 | ||
1325 | return blk_co_preadv(blk, offset, bytes, &qiov, flags); | |
1326 | } | |
1327 | ||
fbb92b67 | 1328 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
95479077 | 1329 | int64_t bytes, QEMUIOVector *qiov, |
fbb92b67 KW |
1330 | BdrvRequestFlags flags) |
1331 | { | |
1332 | int ret; | |
37868b2a | 1333 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1334 | |
1335 | blk_inc_in_flight(blk); | |
d1d3fc3d AF |
1336 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, 0, flags); |
1337 | blk_dec_in_flight(blk); | |
1338 | ||
1339 | return ret; | |
1340 | } | |
1341 | ||
1342 | int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset, | |
1343 | int64_t bytes, QEMUIOVector *qiov, | |
1344 | size_t qiov_offset, BdrvRequestFlags flags) | |
1345 | { | |
1346 | int ret; | |
1347 | IO_OR_GS_CODE(); | |
1348 | ||
1349 | blk_inc_in_flight(blk); | |
1350 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, qiov_offset, flags); | |
fbb92b67 KW |
1351 | blk_dec_in_flight(blk); |
1352 | ||
1353 | return ret; | |
1354 | } | |
1355 | ||
1356 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ | |
07a64aa4 | 1357 | static int coroutine_fn |
70e8775e VSO |
1358 | blk_co_do_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, |
1359 | QEMUIOVector *qiov, size_t qiov_offset, | |
1360 | BdrvRequestFlags flags) | |
a8823a3b | 1361 | { |
bfd18d1e | 1362 | int ret; |
cf312932 | 1363 | BlockDriverState *bs; |
1581a70d | 1364 | IO_CODE(); |
bfd18d1e | 1365 | |
cf312932 | 1366 | blk_wait_while_drained(blk); |
b9b10c35 | 1367 | GRAPH_RDLOCK_GUARD(); |
bfd18d1e | 1368 | |
cf312932 KW |
1369 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1370 | bs = blk_bs(blk); | |
99723548 | 1371 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1372 | |
bfd18d1e | 1373 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1374 | if (ret < 0) { |
1375 | return ret; | |
1376 | } | |
1377 | ||
99723548 | 1378 | bdrv_inc_in_flight(bs); |
441565b2 | 1379 | /* throttling disk I/O */ |
022cdc9f MP |
1380 | if (blk->public.throttle_group_member.throttle_state) { |
1381 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1382 | bytes, true); | |
441565b2 KW |
1383 | } |
1384 | ||
bfd18d1e KW |
1385 | if (!blk->enable_write_cache) { |
1386 | flags |= BDRV_REQ_FUA; | |
1387 | } | |
1388 | ||
b3016864 VSO |
1389 | ret = bdrv_co_pwritev_part(blk->root, offset, bytes, qiov, qiov_offset, |
1390 | flags); | |
99723548 PB |
1391 | bdrv_dec_in_flight(bs); |
1392 | return ret; | |
a8823a3b KW |
1393 | } |
1394 | ||
fbb92b67 | 1395 | int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset, |
34460feb | 1396 | int64_t bytes, |
fbb92b67 KW |
1397 | QEMUIOVector *qiov, size_t qiov_offset, |
1398 | BdrvRequestFlags flags) | |
1399 | { | |
1400 | int ret; | |
37868b2a | 1401 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1402 | |
1403 | blk_inc_in_flight(blk); | |
70e8775e | 1404 | ret = blk_co_do_pwritev_part(blk, offset, bytes, qiov, qiov_offset, flags); |
fbb92b67 KW |
1405 | blk_dec_in_flight(blk); |
1406 | ||
1407 | return ret; | |
1408 | } | |
1409 | ||
6f675c93 AF |
1410 | int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes, |
1411 | const void *buf, BdrvRequestFlags flags) | |
1412 | { | |
1413 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1414 | IO_OR_GS_CODE(); | |
1415 | ||
1416 | assert(bytes <= SIZE_MAX); | |
1417 | ||
1418 | return blk_co_pwritev(blk, offset, bytes, &qiov, flags); | |
1419 | } | |
1420 | ||
b3016864 | 1421 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
34460feb | 1422 | int64_t bytes, QEMUIOVector *qiov, |
b3016864 VSO |
1423 | BdrvRequestFlags flags) |
1424 | { | |
37868b2a | 1425 | IO_OR_GS_CODE(); |
b3016864 VSO |
1426 | return blk_co_pwritev_part(blk, offset, bytes, qiov, 0, flags); |
1427 | } | |
1428 | ||
ff7e261b EGE |
1429 | int coroutine_fn blk_co_block_status_above(BlockBackend *blk, |
1430 | BlockDriverState *base, | |
1431 | int64_t offset, int64_t bytes, | |
1432 | int64_t *pnum, int64_t *map, | |
1433 | BlockDriverState **file) | |
1434 | { | |
1435 | IO_CODE(); | |
7ff9579e | 1436 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1437 | return bdrv_co_block_status_above(blk_bs(blk), base, offset, bytes, pnum, |
1438 | map, file); | |
1439 | } | |
1440 | ||
1441 | int coroutine_fn blk_co_is_allocated_above(BlockBackend *blk, | |
1442 | BlockDriverState *base, | |
1443 | bool include_base, int64_t offset, | |
1444 | int64_t bytes, int64_t *pnum) | |
1445 | { | |
1446 | IO_CODE(); | |
7ff9579e | 1447 | GRAPH_RDLOCK_GUARD(); |
ff7e261b EGE |
1448 | return bdrv_co_is_allocated_above(blk_bs(blk), base, include_base, offset, |
1449 | bytes, pnum); | |
1450 | } | |
1451 | ||
1bf1cbc9 KW |
1452 | typedef struct BlkRwCo { |
1453 | BlockBackend *blk; | |
1454 | int64_t offset; | |
c060332c | 1455 | void *iobuf; |
1bf1cbc9 KW |
1456 | int ret; |
1457 | BdrvRequestFlags flags; | |
1458 | } BlkRwCo; | |
1459 | ||
720ff280 KW |
1460 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1461 | { | |
0439c5a4 | 1462 | GLOBAL_STATE_CODE(); |
720ff280 KW |
1463 | return bdrv_make_zero(blk->root, flags); |
1464 | } | |
1465 | ||
c90e2a9c | 1466 | void blk_inc_in_flight(BlockBackend *blk) |
33f2a757 | 1467 | { |
37868b2a | 1468 | IO_CODE(); |
d73415a3 | 1469 | qatomic_inc(&blk->in_flight); |
33f2a757 SH |
1470 | } |
1471 | ||
c90e2a9c | 1472 | void blk_dec_in_flight(BlockBackend *blk) |
33f2a757 | 1473 | { |
37868b2a | 1474 | IO_CODE(); |
d73415a3 | 1475 | qatomic_dec(&blk->in_flight); |
cfe29d82 | 1476 | aio_wait_kick(); |
33f2a757 SH |
1477 | } |
1478 | ||
e7f7d676 HR |
1479 | static void error_callback_bh(void *opaque) |
1480 | { | |
1481 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1482 | |
33f2a757 | 1483 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1484 | acb->common.cb(acb->common.opaque, acb->ret); |
1485 | qemu_aio_unref(acb); | |
1486 | } | |
1487 | ||
ca78ecfa PL |
1488 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1489 | BlockCompletionFunc *cb, | |
1490 | void *opaque, int ret) | |
e7f7d676 HR |
1491 | { |
1492 | struct BlockBackendAIOCB *acb; | |
37868b2a | 1493 | IO_CODE(); |
e7f7d676 | 1494 | |
33f2a757 | 1495 | blk_inc_in_flight(blk); |
e7f7d676 | 1496 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1497 | acb->blk = blk; |
e7f7d676 HR |
1498 | acb->ret = ret; |
1499 | ||
e4ec5ad4 PD |
1500 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1501 | error_callback_bh, acb); | |
e7f7d676 HR |
1502 | return &acb->common; |
1503 | } | |
1504 | ||
57d6a428 KW |
1505 | typedef struct BlkAioEmAIOCB { |
1506 | BlockAIOCB common; | |
1507 | BlkRwCo rwco; | |
a93d81c8 | 1508 | int64_t bytes; |
57d6a428 | 1509 | bool has_returned; |
57d6a428 KW |
1510 | } BlkAioEmAIOCB; |
1511 | ||
1d719ddc SH |
1512 | static AioContext *blk_aio_em_aiocb_get_aio_context(BlockAIOCB *acb_) |
1513 | { | |
1514 | BlkAioEmAIOCB *acb = container_of(acb_, BlkAioEmAIOCB, common); | |
1515 | ||
1516 | return blk_get_aio_context(acb->rwco.blk); | |
1517 | } | |
1518 | ||
57d6a428 KW |
1519 | static const AIOCBInfo blk_aio_em_aiocb_info = { |
1520 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1d719ddc | 1521 | .get_aio_context = blk_aio_em_aiocb_get_aio_context, |
57d6a428 KW |
1522 | }; |
1523 | ||
1524 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1525 | { | |
57d6a428 KW |
1526 | if (acb->has_returned) { |
1527 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1528 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1529 | qemu_aio_unref(acb); |
1530 | } | |
1531 | } | |
1532 | ||
1533 | static void blk_aio_complete_bh(void *opaque) | |
1534 | { | |
fffb6e12 | 1535 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1536 | assert(acb->has_returned); |
1537 | blk_aio_complete(acb); | |
57d6a428 KW |
1538 | } |
1539 | ||
a93d81c8 VSO |
1540 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, |
1541 | int64_t bytes, | |
c060332c | 1542 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1543 | BdrvRequestFlags flags, |
1544 | BlockCompletionFunc *cb, void *opaque) | |
1545 | { | |
1546 | BlkAioEmAIOCB *acb; | |
1547 | Coroutine *co; | |
1548 | ||
33f2a757 | 1549 | blk_inc_in_flight(blk); |
57d6a428 KW |
1550 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1551 | acb->rwco = (BlkRwCo) { | |
1552 | .blk = blk, | |
1553 | .offset = offset, | |
c060332c | 1554 | .iobuf = iobuf, |
57d6a428 KW |
1555 | .flags = flags, |
1556 | .ret = NOT_DONE, | |
1557 | }; | |
7fa84cd8 | 1558 | acb->bytes = bytes; |
57d6a428 KW |
1559 | acb->has_returned = false; |
1560 | ||
0b8b8753 | 1561 | co = qemu_coroutine_create(co_entry, acb); |
3d65110f | 1562 | aio_co_enter(blk_get_aio_context(blk), co); |
57d6a428 KW |
1563 | |
1564 | acb->has_returned = true; | |
1565 | if (acb->rwco.ret != NOT_DONE) { | |
e4ec5ad4 PD |
1566 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1567 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1568 | } |
1569 | ||
1570 | return &acb->common; | |
1571 | } | |
1572 | ||
881a4c55 | 1573 | static void coroutine_fn blk_aio_read_entry(void *opaque) |
57d6a428 KW |
1574 | { |
1575 | BlkAioEmAIOCB *acb = opaque; | |
1576 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1577 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1578 | |
c060332c | 1579 | assert(qiov->size == acb->bytes); |
d1d3fc3d AF |
1580 | rwco->ret = blk_co_do_preadv_part(rwco->blk, rwco->offset, acb->bytes, qiov, |
1581 | 0, rwco->flags); | |
57d6a428 KW |
1582 | blk_aio_complete(acb); |
1583 | } | |
1584 | ||
881a4c55 | 1585 | static void coroutine_fn blk_aio_write_entry(void *opaque) |
57d6a428 KW |
1586 | { |
1587 | BlkAioEmAIOCB *acb = opaque; | |
1588 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1589 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1590 | |
c060332c | 1591 | assert(!qiov || qiov->size == acb->bytes); |
70e8775e VSO |
1592 | rwco->ret = blk_co_do_pwritev_part(rwco->blk, rwco->offset, acb->bytes, |
1593 | qiov, 0, rwco->flags); | |
57d6a428 KW |
1594 | blk_aio_complete(acb); |
1595 | } | |
1596 | ||
d004bd52 | 1597 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
a93d81c8 | 1598 | int64_t bytes, BdrvRequestFlags flags, |
d004bd52 | 1599 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1600 | { |
37868b2a | 1601 | IO_CODE(); |
a93d81c8 | 1602 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_write_entry, |
983a1600 | 1603 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); |
4be74634 MA |
1604 | } |
1605 | ||
c86422c5 | 1606 | int64_t coroutine_fn blk_co_getlength(BlockBackend *blk) |
4be74634 | 1607 | { |
37868b2a | 1608 | IO_CODE(); |
c73ff92c | 1609 | GRAPH_RDLOCK_GUARD(); |
c86422c5 | 1610 | |
c73ff92c | 1611 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1612 | return -ENOMEDIUM; |
1613 | } | |
1614 | ||
c86422c5 | 1615 | return bdrv_co_getlength(blk_bs(blk)); |
4be74634 MA |
1616 | } |
1617 | ||
1618 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1619 | { | |
37868b2a | 1620 | IO_CODE(); |
f21d96d0 | 1621 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1622 | *nb_sectors_ptr = 0; |
1623 | } else { | |
f21d96d0 | 1624 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1625 | } |
4be74634 MA |
1626 | } |
1627 | ||
c86422c5 | 1628 | int64_t coroutine_fn blk_co_nb_sectors(BlockBackend *blk) |
1ef01253 | 1629 | { |
37868b2a | 1630 | IO_CODE(); |
c73ff92c | 1631 | GRAPH_RDLOCK_GUARD(); |
c86422c5 | 1632 | |
c73ff92c | 1633 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1634 | return -ENOMEDIUM; |
1635 | } | |
1636 | ||
c86422c5 | 1637 | return bdrv_co_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1638 | } |
1639 | ||
60cb2fa7 EB |
1640 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1641 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1642 | BlockCompletionFunc *cb, void *opaque) | |
1643 | { | |
37868b2a | 1644 | IO_CODE(); |
a93d81c8 | 1645 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1646 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1647 | blk_aio_read_entry, flags, cb, opaque); | |
1648 | } | |
1649 | ||
60cb2fa7 EB |
1650 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1651 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1652 | BlockCompletionFunc *cb, void *opaque) | |
1653 | { | |
37868b2a | 1654 | IO_CODE(); |
73d4a113 | 1655 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1656 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1657 | blk_aio_write_entry, flags, cb, opaque); | |
1658 | } | |
1659 | ||
4be74634 MA |
1660 | void blk_aio_cancel(BlockAIOCB *acb) |
1661 | { | |
0439c5a4 | 1662 | GLOBAL_STATE_CODE(); |
4be74634 MA |
1663 | bdrv_aio_cancel(acb); |
1664 | } | |
1665 | ||
1666 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1667 | { | |
37868b2a | 1668 | IO_CODE(); |
4be74634 MA |
1669 | bdrv_aio_cancel_async(acb); |
1670 | } | |
1671 | ||
fbb92b67 | 1672 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
df02da00 | 1673 | static int coroutine_fn |
70e8775e | 1674 | blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1675 | { |
1581a70d EGE |
1676 | IO_CODE(); |
1677 | ||
cf312932 | 1678 | blk_wait_while_drained(blk); |
26c518ab | 1679 | GRAPH_RDLOCK_GUARD(); |
cf312932 | 1680 | |
c73ff92c | 1681 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1682 | return -ENOMEDIUM; |
1683 | } | |
1684 | ||
48af776a KW |
1685 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1686 | } | |
1687 | ||
df02da00 AF |
1688 | int coroutine_fn blk_co_ioctl(BlockBackend *blk, unsigned long int req, |
1689 | void *buf) | |
48af776a | 1690 | { |
16d36e29 | 1691 | int ret; |
37868b2a | 1692 | IO_OR_GS_CODE(); |
c060332c | 1693 | |
16d36e29 | 1694 | blk_inc_in_flight(blk); |
df02da00 | 1695 | ret = blk_co_do_ioctl(blk, req, buf); |
16d36e29 | 1696 | blk_dec_in_flight(blk); |
48af776a | 1697 | |
16d36e29 | 1698 | return ret; |
48af776a KW |
1699 | } |
1700 | ||
881a4c55 | 1701 | static void coroutine_fn blk_aio_ioctl_entry(void *opaque) |
48af776a KW |
1702 | { |
1703 | BlkAioEmAIOCB *acb = opaque; | |
1704 | BlkRwCo *rwco = &acb->rwco; | |
1705 | ||
70e8775e | 1706 | rwco->ret = blk_co_do_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
c060332c | 1707 | |
48af776a | 1708 | blk_aio_complete(acb); |
4be74634 MA |
1709 | } |
1710 | ||
1711 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1712 | BlockCompletionFunc *cb, void *opaque) | |
1713 | { | |
37868b2a | 1714 | IO_CODE(); |
c060332c | 1715 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1716 | } |
1717 | ||
fbb92b67 | 1718 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1719 | static int coroutine_fn |
70e8775e | 1720 | blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes) |
2bb0dce7 | 1721 | { |
cf312932 | 1722 | int ret; |
1581a70d | 1723 | IO_CODE(); |
cf312932 KW |
1724 | |
1725 | blk_wait_while_drained(blk); | |
9a5a1c62 | 1726 | GRAPH_RDLOCK_GUARD(); |
cf312932 KW |
1727 | |
1728 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1729 | if (ret < 0) { |
1730 | return ret; | |
1731 | } | |
1732 | ||
0b9fd3f4 | 1733 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1734 | } |
1735 | ||
881a4c55 | 1736 | static void coroutine_fn blk_aio_pdiscard_entry(void *opaque) |
564806c5 KW |
1737 | { |
1738 | BlkAioEmAIOCB *acb = opaque; | |
1739 | BlkRwCo *rwco = &acb->rwco; | |
1740 | ||
70e8775e | 1741 | rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes); |
564806c5 KW |
1742 | blk_aio_complete(acb); |
1743 | } | |
1744 | ||
1745 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, | |
a93d81c8 | 1746 | int64_t offset, int64_t bytes, |
564806c5 KW |
1747 | BlockCompletionFunc *cb, void *opaque) |
1748 | { | |
37868b2a | 1749 | IO_CODE(); |
564806c5 KW |
1750 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
1751 | cb, opaque); | |
1752 | } | |
1753 | ||
2800637a VSO |
1754 | int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset, |
1755 | int64_t bytes) | |
fbb92b67 KW |
1756 | { |
1757 | int ret; | |
37868b2a | 1758 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1759 | |
1760 | blk_inc_in_flight(blk); | |
70e8775e | 1761 | ret = blk_co_do_pdiscard(blk, offset, bytes); |
fbb92b67 KW |
1762 | blk_dec_in_flight(blk); |
1763 | ||
1764 | return ret; | |
1765 | } | |
1766 | ||
fbb92b67 | 1767 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1768 | static int coroutine_fn blk_co_do_flush(BlockBackend *blk) |
2bb0dce7 | 1769 | { |
1581a70d | 1770 | IO_CODE(); |
88095349 EGE |
1771 | blk_wait_while_drained(blk); |
1772 | GRAPH_RDLOCK_GUARD(); | |
cf312932 | 1773 | |
c73ff92c | 1774 | if (!blk_co_is_available(blk)) { |
c09ba36c HR |
1775 | return -ENOMEDIUM; |
1776 | } | |
1777 | ||
f21d96d0 | 1778 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1779 | } |
1780 | ||
881a4c55 | 1781 | static void coroutine_fn blk_aio_flush_entry(void *opaque) |
564806c5 KW |
1782 | { |
1783 | BlkAioEmAIOCB *acb = opaque; | |
1784 | BlkRwCo *rwco = &acb->rwco; | |
1785 | ||
70e8775e | 1786 | rwco->ret = blk_co_do_flush(rwco->blk); |
564806c5 KW |
1787 | blk_aio_complete(acb); |
1788 | } | |
1789 | ||
1790 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
1791 | BlockCompletionFunc *cb, void *opaque) | |
1792 | { | |
37868b2a | 1793 | IO_CODE(); |
564806c5 KW |
1794 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
1795 | } | |
1796 | ||
fbb92b67 KW |
1797 | int coroutine_fn blk_co_flush(BlockBackend *blk) |
1798 | { | |
1799 | int ret; | |
37868b2a | 1800 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1801 | |
1802 | blk_inc_in_flight(blk); | |
70e8775e | 1803 | ret = blk_co_do_flush(blk); |
fbb92b67 KW |
1804 | blk_dec_in_flight(blk); |
1805 | ||
1806 | return ret; | |
1807 | } | |
1808 | ||
97b0385a AY |
1809 | void blk_drain(BlockBackend *blk) |
1810 | { | |
33f2a757 | 1811 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1812 | GLOBAL_STATE_CODE(); |
33f2a757 SH |
1813 | |
1814 | if (bs) { | |
1e3552db | 1815 | bdrv_ref(bs); |
33f2a757 SH |
1816 | bdrv_drained_begin(bs); |
1817 | } | |
1818 | ||
1819 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 1820 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
d73415a3 | 1821 | qatomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1822 | |
1823 | if (bs) { | |
1824 | bdrv_drained_end(bs); | |
1e3552db | 1825 | bdrv_unref(bs); |
a46fc9c9 | 1826 | } |
97b0385a AY |
1827 | } |
1828 | ||
4be74634 MA |
1829 | void blk_drain_all(void) |
1830 | { | |
33f2a757 SH |
1831 | BlockBackend *blk = NULL; |
1832 | ||
0439c5a4 EGE |
1833 | GLOBAL_STATE_CODE(); |
1834 | ||
33f2a757 SH |
1835 | bdrv_drain_all_begin(); |
1836 | ||
1837 | while ((blk = blk_all_next(blk)) != NULL) { | |
1838 | AioContext *ctx = blk_get_aio_context(blk); | |
1839 | ||
1840 | aio_context_acquire(ctx); | |
1841 | ||
1842 | /* We may have -ENOMEDIUM completions in flight */ | |
d73415a3 | 1843 | AIO_WAIT_WHILE(ctx, qatomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1844 | |
1845 | aio_context_release(ctx); | |
1846 | } | |
1847 | ||
1848 | bdrv_drain_all_end(); | |
4be74634 MA |
1849 | } |
1850 | ||
373340b2 HR |
1851 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1852 | BlockdevOnError on_write_error) | |
1853 | { | |
0439c5a4 | 1854 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1855 | blk->on_read_error = on_read_error; |
1856 | blk->on_write_error = on_write_error; | |
1857 | } | |
1858 | ||
4be74634 MA |
1859 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1860 | { | |
37868b2a | 1861 | IO_CODE(); |
373340b2 | 1862 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1863 | } |
1864 | ||
1865 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1866 | int error) | |
1867 | { | |
373340b2 | 1868 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
37868b2a | 1869 | IO_CODE(); |
373340b2 HR |
1870 | |
1871 | switch (on_err) { | |
1872 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1873 | return (error == ENOSPC) ? | |
1874 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1875 | case BLOCKDEV_ON_ERROR_STOP: | |
1876 | return BLOCK_ERROR_ACTION_STOP; | |
1877 | case BLOCKDEV_ON_ERROR_REPORT: | |
1878 | return BLOCK_ERROR_ACTION_REPORT; | |
1879 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1880 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1881 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1882 | default: |
1883 | abort(); | |
1884 | } | |
4be74634 MA |
1885 | } |
1886 | ||
373340b2 HR |
1887 | static void send_qmp_error_event(BlockBackend *blk, |
1888 | BlockErrorAction action, | |
1889 | bool is_read, int error) | |
1890 | { | |
1891 | IoOperationType optype; | |
bfe1a14c | 1892 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
1893 | |
1894 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
54fde4ff | 1895 | qapi_event_send_block_io_error(blk_name(blk), |
bfe1a14c | 1896 | bs ? bdrv_get_node_name(bs) : NULL, optype, |
2bf7e10f | 1897 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 1898 | error == ENOSPC, strerror(error)); |
373340b2 HR |
1899 | } |
1900 | ||
1901 | /* This is done by device models because, while the block layer knows | |
1902 | * about the error, it does not know whether an operation comes from | |
1903 | * the device or the block layer (from a job, for example). | |
1904 | */ | |
4be74634 MA |
1905 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1906 | bool is_read, int error) | |
1907 | { | |
373340b2 | 1908 | assert(error >= 0); |
37868b2a | 1909 | IO_CODE(); |
373340b2 HR |
1910 | |
1911 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1912 | /* First set the iostatus, so that "info block" returns an iostatus | |
1913 | * that matches the events raised so far (an additional error iostatus | |
1914 | * is fine, but not a lost one). | |
1915 | */ | |
1916 | blk_iostatus_set_err(blk, error); | |
1917 | ||
1918 | /* Then raise the request to stop the VM and the event. | |
1919 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1920 | * it ensures that the STOP event always comes after the | |
1921 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1922 | * can observe the STOP event and do a "cont" before the STOP | |
1923 | * event is issued, the VM will not stop. In this case, vm_start() | |
1924 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1925 | */ | |
1926 | qemu_system_vmstop_request_prepare(); | |
1927 | send_qmp_error_event(blk, action, is_read, error); | |
1928 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1929 | } else { | |
1930 | send_qmp_error_event(blk, action, is_read, error); | |
1931 | } | |
4be74634 MA |
1932 | } |
1933 | ||
86b1cf32 KW |
1934 | /* |
1935 | * Returns true if the BlockBackend can support taking write permissions | |
1936 | * (because its root node is not read-only). | |
1937 | */ | |
1938 | bool blk_supports_write_perm(BlockBackend *blk) | |
4be74634 | 1939 | { |
f21d96d0 | 1940 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1941 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1942 | |
1943 | if (bs) { | |
86b1cf32 | 1944 | return !bdrv_is_read_only(bs); |
061959e8 | 1945 | } else { |
260242a8 | 1946 | return blk->root_state.open_flags & BDRV_O_RDWR; |
061959e8 | 1947 | } |
4be74634 MA |
1948 | } |
1949 | ||
86b1cf32 KW |
1950 | /* |
1951 | * Returns true if the BlockBackend can be written to in its current | |
1952 | * configuration (i.e. if write permission have been requested) | |
1953 | */ | |
1954 | bool blk_is_writable(BlockBackend *blk) | |
1955 | { | |
37868b2a | 1956 | IO_CODE(); |
86b1cf32 KW |
1957 | return blk->perm & BLK_PERM_WRITE; |
1958 | } | |
1959 | ||
96710565 | 1960 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 1961 | { |
f21d96d0 | 1962 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1963 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1964 | |
1965 | if (!bs) { | |
96710565 | 1966 | return false; |
a46fc9c9 HR |
1967 | } |
1968 | ||
f21d96d0 | 1969 | return bdrv_is_sg(bs); |
4be74634 MA |
1970 | } |
1971 | ||
96710565 | 1972 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 1973 | { |
37868b2a | 1974 | IO_CODE(); |
bfd18d1e | 1975 | return blk->enable_write_cache; |
4be74634 MA |
1976 | } |
1977 | ||
1978 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1979 | { | |
be8da05b | 1980 | IO_CODE(); |
bfd18d1e | 1981 | blk->enable_write_cache = wce; |
4be74634 MA |
1982 | } |
1983 | ||
3b717194 | 1984 | void blk_activate(BlockBackend *blk, Error **errp) |
2bb0dce7 | 1985 | { |
f21d96d0 | 1986 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1987 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1988 | |
1989 | if (!bs) { | |
c09ba36c HR |
1990 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1991 | return; | |
1992 | } | |
1993 | ||
a94750d9 | 1994 | bdrv_activate(bs, errp); |
2bb0dce7 HR |
1995 | } |
1996 | ||
1e97be91 | 1997 | bool coroutine_fn blk_co_is_inserted(BlockBackend *blk) |
4be74634 | 1998 | { |
f21d96d0 | 1999 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2000 | IO_CODE(); |
c73ff92c | 2001 | assert_bdrv_graph_readable(); |
f21d96d0 | 2002 | |
1e97be91 | 2003 | return bs && bdrv_co_is_inserted(bs); |
db0284f8 HR |
2004 | } |
2005 | ||
c73ff92c | 2006 | bool coroutine_fn blk_co_is_available(BlockBackend *blk) |
db0284f8 | 2007 | { |
37868b2a | 2008 | IO_CODE(); |
c73ff92c | 2009 | return blk_co_is_inserted(blk) && !blk_dev_is_tray_open(blk); |
4be74634 MA |
2010 | } |
2011 | ||
2c75261c | 2012 | void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked) |
4be74634 | 2013 | { |
f21d96d0 | 2014 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2015 | IO_CODE(); |
f21d96d0 KW |
2016 | |
2017 | if (bs) { | |
2c75261c | 2018 | bdrv_co_lock_medium(bs, locked); |
a46fc9c9 | 2019 | } |
4be74634 MA |
2020 | } |
2021 | ||
2531b390 | 2022 | void coroutine_fn blk_co_eject(BlockBackend *blk, bool eject_flag) |
4be74634 | 2023 | { |
f21d96d0 | 2024 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 | 2025 | char *id; |
37868b2a | 2026 | IO_CODE(); |
2d76e724 | 2027 | |
f21d96d0 | 2028 | if (bs) { |
2531b390 | 2029 | bdrv_co_eject(bs, eject_flag); |
a46fc9c9 | 2030 | } |
c47ee043 JS |
2031 | |
2032 | /* Whether or not we ejected on the backend, | |
2033 | * the frontend experienced a tray event. */ | |
2034 | id = blk_get_attached_dev_id(blk); | |
2035 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 2036 | eject_flag); |
c47ee043 | 2037 | g_free(id); |
4be74634 MA |
2038 | } |
2039 | ||
2040 | int blk_get_flags(BlockBackend *blk) | |
2041 | { | |
f21d96d0 | 2042 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2043 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2044 | |
2045 | if (bs) { | |
2046 | return bdrv_get_flags(bs); | |
061959e8 HR |
2047 | } else { |
2048 | return blk->root_state.open_flags; | |
2049 | } | |
4be74634 MA |
2050 | } |
2051 | ||
4841211e EB |
2052 | /* Returns the minimum request alignment, in bytes; guaranteed nonzero */ |
2053 | uint32_t blk_get_request_alignment(BlockBackend *blk) | |
2054 | { | |
2055 | BlockDriverState *bs = blk_bs(blk); | |
37868b2a | 2056 | IO_CODE(); |
4841211e EB |
2057 | return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE; |
2058 | } | |
2059 | ||
24b36e98 PB |
2060 | /* Returns the maximum hardware transfer length, in bytes; guaranteed nonzero */ |
2061 | uint64_t blk_get_max_hw_transfer(BlockBackend *blk) | |
2062 | { | |
2063 | BlockDriverState *bs = blk_bs(blk); | |
2064 | uint64_t max = INT_MAX; | |
37868b2a | 2065 | IO_CODE(); |
24b36e98 PB |
2066 | |
2067 | if (bs) { | |
2068 | max = MIN_NON_ZERO(max, bs->bl.max_hw_transfer); | |
2069 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); | |
2070 | } | |
2071 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); | |
2072 | } | |
2073 | ||
5def6b80 EB |
2074 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
2075 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 2076 | { |
f21d96d0 | 2077 | BlockDriverState *bs = blk_bs(blk); |
b99f7fa0 | 2078 | uint32_t max = INT_MAX; |
37868b2a | 2079 | IO_CODE(); |
f21d96d0 KW |
2080 | |
2081 | if (bs) { | |
b99f7fa0 | 2082 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); |
a46fc9c9 | 2083 | } |
b99f7fa0 | 2084 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); |
454057b7 PL |
2085 | } |
2086 | ||
cc071629 PB |
2087 | int blk_get_max_hw_iov(BlockBackend *blk) |
2088 | { | |
37868b2a | 2089 | IO_CODE(); |
cc071629 PB |
2090 | return MIN_NON_ZERO(blk->root->bs->bl.max_hw_iov, |
2091 | blk->root->bs->bl.max_iov); | |
2092 | } | |
2093 | ||
648296e0 SH |
2094 | int blk_get_max_iov(BlockBackend *blk) |
2095 | { | |
37868b2a | 2096 | IO_CODE(); |
f21d96d0 | 2097 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
2098 | } |
2099 | ||
f1c17521 PB |
2100 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
2101 | { | |
37868b2a | 2102 | IO_CODE(); |
f21d96d0 | 2103 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
2104 | } |
2105 | ||
4be74634 MA |
2106 | void *blk_blockalign(BlockBackend *blk, size_t size) |
2107 | { | |
37868b2a | 2108 | IO_CODE(); |
f21d96d0 | 2109 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
2110 | } |
2111 | ||
2112 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
2113 | { | |
f21d96d0 | 2114 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2115 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2116 | |
2117 | if (!bs) { | |
a46fc9c9 HR |
2118 | return false; |
2119 | } | |
2120 | ||
f21d96d0 | 2121 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
2122 | } |
2123 | ||
2124 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
2125 | { | |
f21d96d0 | 2126 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2127 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2128 | |
2129 | if (bs) { | |
2130 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 2131 | } |
4be74634 MA |
2132 | } |
2133 | ||
2134 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
2135 | { | |
f21d96d0 | 2136 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2137 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2138 | |
2139 | if (bs) { | |
2140 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 2141 | } |
4be74634 MA |
2142 | } |
2143 | ||
2144 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
2145 | { | |
f21d96d0 | 2146 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2147 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2148 | |
2149 | if (bs) { | |
2150 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 2151 | } |
4be74634 MA |
2152 | } |
2153 | ||
2154 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
2155 | { | |
d861ab3a | 2156 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2157 | IO_CODE(); |
d861ab3a | 2158 | |
d861ab3a | 2159 | if (bs) { |
132ada80 KW |
2160 | AioContext *ctx = bdrv_get_aio_context(blk_bs(blk)); |
2161 | assert(ctx == blk->ctx); | |
d861ab3a KW |
2162 | } |
2163 | ||
2164 | return blk->ctx; | |
4981bdec HR |
2165 | } |
2166 | ||
2167 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
2168 | { | |
2169 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
2170 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
2171 | } |
2172 | ||
97896a48 KW |
2173 | static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2174 | bool update_root_node, Error **errp) | |
4be74634 | 2175 | { |
f21d96d0 | 2176 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 2177 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
97896a48 | 2178 | int ret; |
f21d96d0 KW |
2179 | |
2180 | if (bs) { | |
1e3552db SH |
2181 | bdrv_ref(bs); |
2182 | ||
97896a48 | 2183 | if (update_root_node) { |
f8be48ad EGE |
2184 | /* |
2185 | * update_root_node MUST be false for blk_root_set_aio_ctx_commit(), | |
2186 | * as we are already in the commit function of a transaction. | |
2187 | */ | |
a41cfda1 | 2188 | ret = bdrv_try_change_aio_context(bs, new_context, blk->root, errp); |
97896a48 | 2189 | if (ret < 0) { |
1e3552db | 2190 | bdrv_unref(bs); |
97896a48 KW |
2191 | return ret; |
2192 | } | |
2193 | } | |
af5b6ebe HR |
2194 | /* |
2195 | * Make blk->ctx consistent with the root node before we invoke any | |
2196 | * other operations like drain that might inquire blk->ctx | |
2197 | */ | |
2198 | blk->ctx = new_context; | |
c61791fc | 2199 | if (tgm->throttle_state) { |
dc868fb0 | 2200 | bdrv_drained_begin(bs); |
c61791fc MP |
2201 | throttle_group_detach_aio_context(tgm); |
2202 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 2203 | bdrv_drained_end(bs); |
7ca7f0f6 | 2204 | } |
1e3552db SH |
2205 | |
2206 | bdrv_unref(bs); | |
af5b6ebe HR |
2207 | } else { |
2208 | blk->ctx = new_context; | |
a46fc9c9 | 2209 | } |
97896a48 KW |
2210 | |
2211 | return 0; | |
4be74634 MA |
2212 | } |
2213 | ||
97896a48 KW |
2214 | int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2215 | Error **errp) | |
38475269 | 2216 | { |
0439c5a4 | 2217 | GLOBAL_STATE_CODE(); |
97896a48 | 2218 | return blk_do_set_aio_context(blk, new_context, true, errp); |
38475269 KW |
2219 | } |
2220 | ||
33949396 EGE |
2221 | typedef struct BdrvStateBlkRootContext { |
2222 | AioContext *new_ctx; | |
2223 | BlockBackend *blk; | |
2224 | } BdrvStateBlkRootContext; | |
2225 | ||
2226 | static void blk_root_set_aio_ctx_commit(void *opaque) | |
2227 | { | |
2228 | BdrvStateBlkRootContext *s = opaque; | |
2229 | BlockBackend *blk = s->blk; | |
2230 | ||
2231 | blk_do_set_aio_context(blk, s->new_ctx, false, &error_abort); | |
2232 | } | |
2233 | ||
2234 | static TransactionActionDrv set_blk_root_context = { | |
2235 | .commit = blk_root_set_aio_ctx_commit, | |
2236 | .clean = g_free, | |
2237 | }; | |
2238 | ||
2239 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, | |
2240 | GHashTable *visited, Transaction *tran, | |
2241 | Error **errp) | |
38475269 KW |
2242 | { |
2243 | BlockBackend *blk = child->opaque; | |
33949396 | 2244 | BdrvStateBlkRootContext *s; |
38475269 | 2245 | |
33949396 EGE |
2246 | if (!blk->allow_aio_context_change) { |
2247 | /* | |
2248 | * Manually created BlockBackends (those with a name) that are not | |
2249 | * attached to anything can change their AioContext without updating | |
2250 | * their user; return an error for others. | |
2251 | */ | |
2252 | if (!blk->name || blk->dev) { | |
2253 | /* TODO Add BB name/QOM path */ | |
2254 | error_setg(errp, "Cannot change iothread of active block backend"); | |
2255 | return false; | |
2256 | } | |
980b0f94 KW |
2257 | } |
2258 | ||
33949396 EGE |
2259 | s = g_new(BdrvStateBlkRootContext, 1); |
2260 | *s = (BdrvStateBlkRootContext) { | |
2261 | .new_ctx = ctx, | |
2262 | .blk = blk, | |
2263 | }; | |
38475269 | 2264 | |
33949396 | 2265 | tran_add(tran, &set_blk_root_context, s); |
38475269 KW |
2266 | return true; |
2267 | } | |
2268 | ||
2019ba0a HR |
2269 | void blk_add_aio_context_notifier(BlockBackend *blk, |
2270 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
2271 | void (*detach_aio_context)(void *opaque), void *opaque) | |
2272 | { | |
d03654ea | 2273 | BlockBackendAioNotifier *notifier; |
f21d96d0 | 2274 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2275 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2276 | |
d03654ea SH |
2277 | notifier = g_new(BlockBackendAioNotifier, 1); |
2278 | notifier->attached_aio_context = attached_aio_context; | |
2279 | notifier->detach_aio_context = detach_aio_context; | |
2280 | notifier->opaque = opaque; | |
2281 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
2282 | ||
f21d96d0 KW |
2283 | if (bs) { |
2284 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2285 | detach_aio_context, opaque); |
2286 | } | |
2019ba0a HR |
2287 | } |
2288 | ||
2289 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
2290 | void (*attached_aio_context)(AioContext *, | |
2291 | void *), | |
2292 | void (*detach_aio_context)(void *), | |
2293 | void *opaque) | |
2294 | { | |
d03654ea | 2295 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
2296 | BlockDriverState *bs = blk_bs(blk); |
2297 | ||
0439c5a4 EGE |
2298 | GLOBAL_STATE_CODE(); |
2299 | ||
f21d96d0 KW |
2300 | if (bs) { |
2301 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2302 | detach_aio_context, opaque); |
2303 | } | |
d03654ea SH |
2304 | |
2305 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
2306 | if (notifier->attached_aio_context == attached_aio_context && | |
2307 | notifier->detach_aio_context == detach_aio_context && | |
2308 | notifier->opaque == opaque) { | |
2309 | QLIST_REMOVE(notifier, list); | |
2310 | g_free(notifier); | |
2311 | return; | |
2312 | } | |
2313 | } | |
2314 | ||
2315 | abort(); | |
2019ba0a HR |
2316 | } |
2317 | ||
3301f6c6 HR |
2318 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
2319 | { | |
0439c5a4 | 2320 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2321 | notifier_list_add(&blk->remove_bs_notifiers, notify); |
2322 | } | |
2323 | ||
2324 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
2325 | { | |
0439c5a4 | 2326 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2327 | notifier_list_add(&blk->insert_bs_notifiers, notify); |
2328 | } | |
2329 | ||
8f497454 | 2330 | void coroutine_fn blk_co_io_plug(BlockBackend *blk) |
4be74634 | 2331 | { |
f21d96d0 | 2332 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2333 | IO_CODE(); |
c3827069 | 2334 | GRAPH_RDLOCK_GUARD(); |
f21d96d0 KW |
2335 | |
2336 | if (bs) { | |
8f497454 | 2337 | bdrv_co_io_plug(bs); |
a46fc9c9 | 2338 | } |
4be74634 MA |
2339 | } |
2340 | ||
09d9fc97 | 2341 | void coroutine_fn blk_co_io_unplug(BlockBackend *blk) |
4be74634 | 2342 | { |
f21d96d0 | 2343 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2344 | IO_CODE(); |
c3827069 | 2345 | GRAPH_RDLOCK_GUARD(); |
f21d96d0 KW |
2346 | |
2347 | if (bs) { | |
09d9fc97 | 2348 | bdrv_co_io_unplug(bs); |
a46fc9c9 | 2349 | } |
4be74634 MA |
2350 | } |
2351 | ||
2352 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
2353 | { | |
37868b2a | 2354 | IO_CODE(); |
7f0e9da6 | 2355 | return &blk->stats; |
4be74634 MA |
2356 | } |
2357 | ||
2358 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
2359 | BlockCompletionFunc *cb, void *opaque) | |
2360 | { | |
37868b2a | 2361 | IO_CODE(); |
4be74634 MA |
2362 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); |
2363 | } | |
1ef01253 | 2364 | |
d004bd52 | 2365 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
34460feb | 2366 | int64_t bytes, BdrvRequestFlags flags) |
1ef01253 | 2367 | { |
37868b2a | 2368 | IO_OR_GS_CODE(); |
f5a5ca79 | 2369 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 2370 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
2371 | } |
2372 | ||
2c9715fa AF |
2373 | int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset, |
2374 | int64_t bytes, const void *buf) | |
1ef01253 | 2375 | { |
06f0325c | 2376 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |
37868b2a | 2377 | IO_OR_GS_CODE(); |
2c9715fa AF |
2378 | return blk_co_pwritev_part(blk, offset, bytes, &qiov, 0, |
2379 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2380 | } |
2381 | ||
015ed252 AF |
2382 | int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact, |
2383 | PreallocMode prealloc, BdrvRequestFlags flags, | |
2384 | Error **errp) | |
1ef01253 | 2385 | { |
37868b2a | 2386 | IO_OR_GS_CODE(); |
c2b8e315 | 2387 | GRAPH_RDLOCK_GUARD(); |
c73ff92c | 2388 | if (!blk_co_is_available(blk)) { |
ed3d2ec9 | 2389 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2390 | return -ENOMEDIUM; |
2391 | } | |
2392 | ||
015ed252 | 2393 | return bdrv_co_truncate(blk->root, offset, exact, prealloc, flags, errp); |
1ef01253 HR |
2394 | } |
2395 | ||
1ef01253 HR |
2396 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, |
2397 | int64_t pos, int size) | |
2398 | { | |
bfd18d1e | 2399 | int ret; |
0439c5a4 | 2400 | GLOBAL_STATE_CODE(); |
bfd18d1e | 2401 | |
c09ba36c HR |
2402 | if (!blk_is_available(blk)) { |
2403 | return -ENOMEDIUM; | |
2404 | } | |
2405 | ||
bfd18d1e KW |
2406 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2407 | if (ret < 0) { | |
2408 | return ret; | |
2409 | } | |
2410 | ||
2411 | if (ret == size && !blk->enable_write_cache) { | |
2412 | ret = bdrv_flush(blk_bs(blk)); | |
2413 | } | |
2414 | ||
2415 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2416 | } |
2417 | ||
2418 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2419 | { | |
0439c5a4 | 2420 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2421 | if (!blk_is_available(blk)) { |
2422 | return -ENOMEDIUM; | |
2423 | } | |
2424 | ||
f21d96d0 | 2425 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2426 | } |
f0272c4d ET |
2427 | |
2428 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2429 | { | |
0439c5a4 | 2430 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2431 | if (!blk_is_available(blk)) { |
2432 | return -ENOMEDIUM; | |
2433 | } | |
2434 | ||
f21d96d0 | 2435 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2436 | } |
2437 | ||
2438 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2439 | { | |
0439c5a4 | 2440 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2441 | if (!blk_is_available(blk)) { |
2442 | return -ENOMEDIUM; | |
2443 | } | |
2444 | ||
f21d96d0 | 2445 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2446 | } |
281d22d8 HR |
2447 | |
2448 | /* | |
2449 | * Updates the BlockBackendRootState object with data from the currently | |
2450 | * attached BlockDriverState. | |
2451 | */ | |
2452 | void blk_update_root_state(BlockBackend *blk) | |
2453 | { | |
0439c5a4 | 2454 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2455 | assert(blk->root); |
281d22d8 | 2456 | |
f21d96d0 | 2457 | blk->root_state.open_flags = blk->root->bs->open_flags; |
f21d96d0 | 2458 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; |
281d22d8 HR |
2459 | } |
2460 | ||
38cb18f5 | 2461 | /* |
b85114f8 KW |
2462 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2463 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2464 | */ |
b85114f8 | 2465 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2466 | { |
0439c5a4 | 2467 | GLOBAL_STATE_CODE(); |
b85114f8 | 2468 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2469 | } |
2470 | ||
2471 | /* | |
2472 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2473 | * supposed to inherit the root state. | |
2474 | */ | |
2475 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2476 | { | |
0439c5a4 | 2477 | GLOBAL_STATE_CODE(); |
260242a8 | 2478 | return blk->root_state.open_flags; |
38cb18f5 HR |
2479 | } |
2480 | ||
281d22d8 HR |
2481 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2482 | { | |
0439c5a4 | 2483 | GLOBAL_STATE_CODE(); |
281d22d8 HR |
2484 | return &blk->root_state; |
2485 | } | |
1393f212 HR |
2486 | |
2487 | int blk_commit_all(void) | |
2488 | { | |
fe1a9cbc | 2489 | BlockBackend *blk = NULL; |
0439c5a4 | 2490 | GLOBAL_STATE_CODE(); |
fe1a9cbc HR |
2491 | |
2492 | while ((blk = blk_all_next(blk)) != NULL) { | |
2493 | AioContext *aio_context = blk_get_aio_context(blk); | |
9a71b9de | 2494 | BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk)); |
fe1a9cbc HR |
2495 | |
2496 | aio_context_acquire(aio_context); | |
9a71b9de HR |
2497 | if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) { |
2498 | int ret; | |
2499 | ||
2500 | ret = bdrv_commit(unfiltered_bs); | |
fe1a9cbc HR |
2501 | if (ret < 0) { |
2502 | aio_context_release(aio_context); | |
2503 | return ret; | |
2504 | } | |
2505 | } | |
2506 | aio_context_release(aio_context); | |
2507 | } | |
2508 | return 0; | |
2509 | } | |
2510 | ||
97148076 KW |
2511 | |
2512 | /* throttling disk I/O limits */ | |
2513 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2514 | { | |
0439c5a4 | 2515 | GLOBAL_STATE_CODE(); |
022cdc9f | 2516 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2517 | } |
2518 | ||
2519 | void blk_io_limits_disable(BlockBackend *blk) | |
2520 | { | |
48bf7ea8 AG |
2521 | BlockDriverState *bs = blk_bs(blk); |
2522 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2523 | assert(tgm->throttle_state); | |
0439c5a4 | 2524 | GLOBAL_STATE_CODE(); |
48bf7ea8 | 2525 | if (bs) { |
1e3552db | 2526 | bdrv_ref(bs); |
48bf7ea8 AG |
2527 | bdrv_drained_begin(bs); |
2528 | } | |
2529 | throttle_group_unregister_tgm(tgm); | |
2530 | if (bs) { | |
2531 | bdrv_drained_end(bs); | |
1e3552db | 2532 | bdrv_unref(bs); |
48bf7ea8 | 2533 | } |
97148076 KW |
2534 | } |
2535 | ||
2536 | /* should be called before blk_set_io_limits if a limit is set */ | |
2537 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2538 | { | |
022cdc9f | 2539 | assert(!blk->public.throttle_group_member.throttle_state); |
0439c5a4 | 2540 | GLOBAL_STATE_CODE(); |
c61791fc MP |
2541 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2542 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2543 | } |
2544 | ||
2545 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2546 | { | |
0439c5a4 | 2547 | GLOBAL_STATE_CODE(); |
97148076 | 2548 | /* this BB is not part of any group */ |
022cdc9f | 2549 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2550 | return; |
2551 | } | |
2552 | ||
2553 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2554 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2555 | group)) { | |
97148076 KW |
2556 | return; |
2557 | } | |
2558 | ||
2559 | /* need to change the group this bs belong to */ | |
2560 | blk_io_limits_disable(blk); | |
2561 | blk_io_limits_enable(blk, group); | |
2562 | } | |
c2066af0 KW |
2563 | |
2564 | static void blk_root_drained_begin(BdrvChild *child) | |
2565 | { | |
2566 | BlockBackend *blk = child->opaque; | |
d73415a3 | 2567 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
c2066af0 | 2568 | |
f4d9cc88 JS |
2569 | if (++blk->quiesce_counter == 1) { |
2570 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
2571 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2572 | } | |
2573 | } | |
2574 | ||
36fe1331 KW |
2575 | /* Note that blk->root may not be accessible here yet if we are just |
2576 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2577 | ||
d73415a3 SH |
2578 | if (qatomic_fetch_inc(&tgm->io_limits_disabled) == 0) { |
2579 | throttle_group_restart_tgm(tgm); | |
c2066af0 KW |
2580 | } |
2581 | } | |
2582 | ||
fe5258a5 KW |
2583 | static bool blk_root_drained_poll(BdrvChild *child) |
2584 | { | |
2585 | BlockBackend *blk = child->opaque; | |
095cc4d0 | 2586 | bool busy = false; |
fe5258a5 | 2587 | assert(blk->quiesce_counter); |
095cc4d0 SL |
2588 | |
2589 | if (blk->dev_ops && blk->dev_ops->drained_poll) { | |
2590 | busy = blk->dev_ops->drained_poll(blk->dev_opaque); | |
2591 | } | |
2592 | return busy || !!blk->in_flight; | |
fe5258a5 KW |
2593 | } |
2594 | ||
2f65df6e | 2595 | static void blk_root_drained_end(BdrvChild *child) |
c2066af0 KW |
2596 | { |
2597 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 2598 | assert(blk->quiesce_counter); |
c2066af0 | 2599 | |
022cdc9f | 2600 | assert(blk->public.throttle_group_member.io_limits_disabled); |
d73415a3 | 2601 | qatomic_dec(&blk->public.throttle_group_member.io_limits_disabled); |
f4d9cc88 JS |
2602 | |
2603 | if (--blk->quiesce_counter == 0) { | |
2604 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
2605 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2606 | } | |
cf312932 KW |
2607 | while (qemu_co_enter_next(&blk->queued_requests, NULL)) { |
2608 | /* Resume all queued requests */ | |
2609 | } | |
f4d9cc88 | 2610 | } |
c2066af0 | 2611 | } |
23d0ba93 | 2612 | |
f4ec04ba | 2613 | bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp) |
23d0ba93 | 2614 | { |
71038951 SH |
2615 | BlockDriverState *bs = blk_bs(blk); |
2616 | ||
0439c5a4 | 2617 | GLOBAL_STATE_CODE(); |
71038951 SH |
2618 | |
2619 | if (bs) { | |
2620 | return bdrv_register_buf(bs, host, size, errp); | |
2621 | } | |
2622 | return true; | |
23d0ba93 FZ |
2623 | } |
2624 | ||
4f384011 | 2625 | void blk_unregister_buf(BlockBackend *blk, void *host, size_t size) |
23d0ba93 | 2626 | { |
71038951 SH |
2627 | BlockDriverState *bs = blk_bs(blk); |
2628 | ||
0439c5a4 | 2629 | GLOBAL_STATE_CODE(); |
71038951 SH |
2630 | |
2631 | if (bs) { | |
2632 | bdrv_unregister_buf(bs, host, size); | |
2633 | } | |
23d0ba93 | 2634 | } |
b5679fa4 FZ |
2635 | |
2636 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2637 | BlockBackend *blk_out, int64_t off_out, | |
e192179b | 2638 | int64_t bytes, BdrvRequestFlags read_flags, |
67b51fb9 | 2639 | BdrvRequestFlags write_flags) |
b5679fa4 FZ |
2640 | { |
2641 | int r; | |
37868b2a | 2642 | IO_CODE(); |
c73ff92c | 2643 | GRAPH_RDLOCK_GUARD(); |
37868b2a | 2644 | |
b5679fa4 FZ |
2645 | r = blk_check_byte_request(blk_in, off_in, bytes); |
2646 | if (r) { | |
2647 | return r; | |
2648 | } | |
2649 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2650 | if (r) { | |
2651 | return r; | |
2652 | } | |
742bf09b | 2653 | |
b5679fa4 FZ |
2654 | return bdrv_co_copy_range(blk_in->root, off_in, |
2655 | blk_out->root, off_out, | |
67b51fb9 | 2656 | bytes, read_flags, write_flags); |
b5679fa4 | 2657 | } |
5d3b4e99 VSO |
2658 | |
2659 | const BdrvChild *blk_root(BlockBackend *blk) | |
2660 | { | |
0439c5a4 | 2661 | GLOBAL_STATE_CODE(); |
5d3b4e99 VSO |
2662 | return blk->root; |
2663 | } | |
2b7bbdbd HR |
2664 | |
2665 | int blk_make_empty(BlockBackend *blk, Error **errp) | |
2666 | { | |
0439c5a4 | 2667 | GLOBAL_STATE_CODE(); |
2b7bbdbd HR |
2668 | if (!blk_is_available(blk)) { |
2669 | error_setg(errp, "No medium inserted"); | |
2670 | return -ENOMEDIUM; | |
2671 | } | |
2672 | ||
2673 | return bdrv_make_empty(blk->root, errp); | |
2674 | } |