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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); |
e037c09c | 132 | static void blk_root_drained_end(BdrvChild *child, int *drained_end_counter); |
f21d96d0 | 133 | |
5c8cab48 KW |
134 | static void blk_root_change_media(BdrvChild *child, bool load); |
135 | static void blk_root_resize(BdrvChild *child); | |
136 | ||
38475269 KW |
137 | static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx, |
138 | GSList **ignore, Error **errp); | |
139 | static void blk_root_set_aio_ctx(BdrvChild *child, AioContext *ctx, | |
140 | GSList **ignore); | |
141 | ||
b5411555 KW |
142 | static char *blk_root_get_parent_desc(BdrvChild *child) |
143 | { | |
144 | BlockBackend *blk = child->opaque; | |
fd240a18 | 145 | g_autofree char *dev_id = NULL; |
b5411555 KW |
146 | |
147 | if (blk->name) { | |
fd240a18 | 148 | return g_strdup_printf("block device '%s'", blk->name); |
b5411555 KW |
149 | } |
150 | ||
151 | dev_id = blk_get_attached_dev_id(blk); | |
152 | if (*dev_id) { | |
fd240a18 | 153 | return g_strdup_printf("block device '%s'", dev_id); |
b5411555 KW |
154 | } else { |
155 | /* TODO Callback into the BB owner for something more detailed */ | |
fd240a18 | 156 | return g_strdup("an unnamed block device"); |
b5411555 KW |
157 | } |
158 | } | |
159 | ||
4c265bf9 KW |
160 | static const char *blk_root_get_name(BdrvChild *child) |
161 | { | |
162 | return blk_name(child->opaque); | |
163 | } | |
164 | ||
538f0497 | 165 | static void blk_vm_state_changed(void *opaque, bool running, RunState state) |
5f7772c4 FZ |
166 | { |
167 | Error *local_err = NULL; | |
168 | BlockBackend *blk = opaque; | |
169 | ||
170 | if (state == RUN_STATE_INMIGRATE) { | |
171 | return; | |
172 | } | |
173 | ||
174 | qemu_del_vm_change_state_handler(blk->vmsh); | |
175 | blk->vmsh = NULL; | |
176 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
177 | if (local_err) { | |
178 | error_report_err(local_err); | |
179 | } | |
180 | } | |
181 | ||
4417ab7a KW |
182 | /* |
183 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
184 | * devices can tighten their permissions in response (specifically revoke | |
185 | * shared write permissions that we needed for storage migration). | |
186 | * | |
187 | * If an error is returned, the VM cannot be allowed to be resumed. | |
188 | */ | |
189 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
190 | { | |
191 | BlockBackend *blk = child->opaque; | |
192 | Error *local_err = NULL; | |
492a1196 | 193 | uint64_t saved_shared_perm; |
4417ab7a KW |
194 | |
195 | if (!blk->disable_perm) { | |
196 | return; | |
197 | } | |
198 | ||
199 | blk->disable_perm = false; | |
200 | ||
492a1196 HR |
201 | /* |
202 | * blk->shared_perm contains the permissions we want to share once | |
203 | * migration is really completely done. For now, we need to share | |
204 | * all; but we also need to retain blk->shared_perm, which is | |
205 | * overwritten by a successful blk_set_perm() call. Save it and | |
206 | * restore it below. | |
207 | */ | |
208 | saved_shared_perm = blk->shared_perm; | |
209 | ||
5f7772c4 FZ |
210 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
211 | if (local_err) { | |
212 | error_propagate(errp, local_err); | |
213 | blk->disable_perm = true; | |
214 | return; | |
215 | } | |
492a1196 | 216 | blk->shared_perm = saved_shared_perm; |
5f7772c4 FZ |
217 | |
218 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
219 | /* Activation can happen when migration process is still active, for | |
220 | * example when nbd_server_add is called during non-shared storage | |
221 | * migration. Defer the shared_perm update to migration completion. */ | |
222 | if (!blk->vmsh) { | |
223 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
224 | blk); | |
225 | } | |
226 | return; | |
227 | } | |
228 | ||
4417ab7a KW |
229 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
230 | if (local_err) { | |
231 | error_propagate(errp, local_err); | |
232 | blk->disable_perm = true; | |
233 | return; | |
234 | } | |
235 | } | |
236 | ||
ca2e2144 FZ |
237 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
238 | { | |
0439c5a4 | 239 | GLOBAL_STATE_CODE(); |
ca2e2144 FZ |
240 | blk->force_allow_inactivate = true; |
241 | } | |
242 | ||
c16de8f5 FZ |
243 | static bool blk_can_inactivate(BlockBackend *blk) |
244 | { | |
ca2e2144 | 245 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
246 | if (blk->dev || blk_name(blk)[0]) { |
247 | return true; | |
248 | } | |
249 | ||
ca2e2144 FZ |
250 | /* Inactivating means no more writes to the image can be done, |
251 | * even if those writes would be changes invisible to the | |
252 | * guest. For block job BBs that satisfy this, we can just allow | |
253 | * it. This is the case for mirror job source, which is required | |
254 | * by libvirt non-shared block migration. */ | |
255 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
256 | return true; | |
257 | } | |
258 | ||
259 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
260 | } |
261 | ||
cfa1a572 KW |
262 | static int blk_root_inactivate(BdrvChild *child) |
263 | { | |
264 | BlockBackend *blk = child->opaque; | |
265 | ||
266 | if (blk->disable_perm) { | |
267 | return 0; | |
268 | } | |
269 | ||
c16de8f5 | 270 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
271 | return -EPERM; |
272 | } | |
273 | ||
274 | blk->disable_perm = true; | |
275 | if (blk->root) { | |
276 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
277 | } | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
d03654ea SH |
282 | static void blk_root_attach(BdrvChild *child) |
283 | { | |
284 | BlockBackend *blk = child->opaque; | |
285 | BlockBackendAioNotifier *notifier; | |
286 | ||
287 | trace_blk_root_attach(child, blk, child->bs); | |
288 | ||
289 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
290 | bdrv_add_aio_context_notifier(child->bs, | |
291 | notifier->attached_aio_context, | |
292 | notifier->detach_aio_context, | |
293 | notifier->opaque); | |
294 | } | |
295 | } | |
296 | ||
297 | static void blk_root_detach(BdrvChild *child) | |
298 | { | |
299 | BlockBackend *blk = child->opaque; | |
300 | BlockBackendAioNotifier *notifier; | |
301 | ||
302 | trace_blk_root_detach(child, blk, child->bs); | |
303 | ||
304 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
305 | bdrv_remove_aio_context_notifier(child->bs, | |
306 | notifier->attached_aio_context, | |
307 | notifier->detach_aio_context, | |
308 | notifier->opaque); | |
309 | } | |
310 | } | |
311 | ||
3ca1f322 VSO |
312 | static AioContext *blk_root_get_parent_aio_context(BdrvChild *c) |
313 | { | |
314 | BlockBackend *blk = c->opaque; | |
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 KW |
336 | |
337 | .can_set_aio_ctx = blk_root_can_set_aio_ctx, | |
338 | .set_aio_ctx = blk_root_set_aio_ctx, | |
3ca1f322 VSO |
339 | |
340 | .get_parent_aio_context = blk_root_get_parent_aio_context, | |
f21d96d0 KW |
341 | }; |
342 | ||
26f54e9a | 343 | /* |
efaa7c4e | 344 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
345 | * |
346 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
347 | * to request for a block driver node that is attached to this BlockBackend. | |
348 | * @shared_perm is a bitmask which describes which permissions may be granted | |
349 | * to other users of the attached node. | |
350 | * Both sets of permissions can be changed later using blk_set_perm(). | |
351 | * | |
26f54e9a MA |
352 | * Return the new BlockBackend on success, null on failure. |
353 | */ | |
d861ab3a | 354 | BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
355 | { |
356 | BlockBackend *blk; | |
357 | ||
0439c5a4 EGE |
358 | GLOBAL_STATE_CODE(); |
359 | ||
26f54e9a | 360 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 361 | blk->refcnt = 1; |
d861ab3a | 362 | blk->ctx = ctx; |
6d0eb64d KW |
363 | blk->perm = perm; |
364 | blk->shared_perm = shared_perm; | |
0c3169df KW |
365 | blk_set_enable_write_cache(blk, true); |
366 | ||
cb53460b KW |
367 | blk->on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
368 | blk->on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
369 | ||
9caa6f3d | 370 | block_acct_init(&blk->stats); |
27ccdd52 | 371 | |
cf312932 | 372 | qemu_co_queue_init(&blk->queued_requests); |
3301f6c6 HR |
373 | notifier_list_init(&blk->remove_bs_notifiers); |
374 | notifier_list_init(&blk->insert_bs_notifiers); | |
d03654ea | 375 | QLIST_INIT(&blk->aio_notifiers); |
27ccdd52 | 376 | |
2cf22d6a | 377 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
378 | return blk; |
379 | } | |
380 | ||
a3aeeab5 EB |
381 | /* |
382 | * Create a new BlockBackend connected to an existing BlockDriverState. | |
383 | * | |
384 | * @perm is a bitmasks of BLK_PERM_* constants which describes the | |
385 | * permissions to request for @bs that is attached to this | |
386 | * BlockBackend. @shared_perm is a bitmask which describes which | |
387 | * permissions may be granted to other users of the attached node. | |
388 | * Both sets of permissions can be changed later using blk_set_perm(). | |
389 | * | |
390 | * Return the new BlockBackend on success, null on failure. | |
391 | */ | |
392 | BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm, | |
393 | uint64_t shared_perm, Error **errp) | |
394 | { | |
395 | BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm); | |
396 | ||
0439c5a4 EGE |
397 | GLOBAL_STATE_CODE(); |
398 | ||
a3aeeab5 EB |
399 | if (blk_insert_bs(blk, bs, errp) < 0) { |
400 | blk_unref(blk); | |
401 | return NULL; | |
402 | } | |
403 | return blk; | |
404 | } | |
405 | ||
7e7d56d9 | 406 | /* |
28eb9b12 | 407 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
d861ab3a | 408 | * The new BlockBackend is in the main AioContext. |
ca49a4fd HR |
409 | * |
410 | * Just as with bdrv_open(), after having called this function the reference to | |
411 | * @options belongs to the block layer (even on failure). | |
412 | * | |
413 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
414 | * BDS tree just by specifying the @options QDict (or @reference, | |
415 | * alternatively). At the time of adding this function, this is not possible, | |
416 | * though, so callers of this function have to be able to specify @filename and | |
417 | * @flags. | |
418 | */ | |
efaa7c4e HR |
419 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
420 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
421 | { |
422 | BlockBackend *blk; | |
28eb9b12 | 423 | BlockDriverState *bs; |
1f4ad7d3 | 424 | uint64_t perm = 0; |
35b7f4ab | 425 | uint64_t shared = BLK_PERM_ALL; |
c62d32f5 | 426 | |
0439c5a4 EGE |
427 | GLOBAL_STATE_CODE(); |
428 | ||
35b7f4ab KW |
429 | /* |
430 | * blk_new_open() is mainly used in .bdrv_create implementations and the | |
431 | * tools where sharing isn't a major concern because the BDS stays private | |
432 | * and the file is generally not supposed to be used by a second process, | |
433 | * so we just request permission according to the flags. | |
c62d32f5 KW |
434 | * |
435 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
436 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
437 | * shouldn't hurt either. We can still share everything here because the | |
35b7f4ab KW |
438 | * guest devices will add their own blockers if they can't share. |
439 | */ | |
1f4ad7d3 KW |
440 | if ((flags & BDRV_O_NO_IO) == 0) { |
441 | perm |= BLK_PERM_CONSISTENT_READ; | |
442 | if (flags & BDRV_O_RDWR) { | |
443 | perm |= BLK_PERM_WRITE; | |
444 | } | |
c62d32f5 KW |
445 | } |
446 | if (flags & BDRV_O_RESIZE) { | |
447 | perm |= BLK_PERM_RESIZE; | |
448 | } | |
35b7f4ab KW |
449 | if (flags & BDRV_O_NO_SHARE) { |
450 | shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; | |
451 | } | |
ca49a4fd | 452 | |
35b7f4ab | 453 | blk = blk_new(qemu_get_aio_context(), perm, shared); |
5b363937 HR |
454 | bs = bdrv_open(filename, reference, options, flags, errp); |
455 | if (!bs) { | |
ca49a4fd HR |
456 | blk_unref(blk); |
457 | return NULL; | |
458 | } | |
459 | ||
1f38f04e HR |
460 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
461 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
35b7f4ab | 462 | perm, shared, blk, errp); |
50bfbe93 | 463 | if (!blk->root) { |
50bfbe93 FZ |
464 | blk_unref(blk); |
465 | return NULL; | |
466 | } | |
72e775c7 | 467 | |
ca49a4fd HR |
468 | return blk; |
469 | } | |
470 | ||
26f54e9a MA |
471 | static void blk_delete(BlockBackend *blk) |
472 | { | |
473 | assert(!blk->refcnt); | |
e5e78550 | 474 | assert(!blk->name); |
a7f53e26 | 475 | assert(!blk->dev); |
022cdc9f | 476 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
477 | blk_io_limits_disable(blk); |
478 | } | |
f21d96d0 | 479 | if (blk->root) { |
13855c6b | 480 | blk_remove_bs(blk); |
7e7d56d9 | 481 | } |
5f7772c4 FZ |
482 | if (blk->vmsh) { |
483 | qemu_del_vm_change_state_handler(blk->vmsh); | |
484 | blk->vmsh = NULL; | |
485 | } | |
3301f6c6 HR |
486 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
487 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 488 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
2cf22d6a | 489 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 490 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 491 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
492 | g_free(blk); |
493 | } | |
494 | ||
8fb3c76c MA |
495 | static void drive_info_del(DriveInfo *dinfo) |
496 | { | |
497 | if (!dinfo) { | |
498 | return; | |
499 | } | |
500 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
501 | g_free(dinfo); |
502 | } | |
503 | ||
f636ae85 AG |
504 | int blk_get_refcnt(BlockBackend *blk) |
505 | { | |
0439c5a4 | 506 | GLOBAL_STATE_CODE(); |
f636ae85 AG |
507 | return blk ? blk->refcnt : 0; |
508 | } | |
509 | ||
26f54e9a MA |
510 | /* |
511 | * Increment @blk's reference count. | |
512 | * @blk must not be null. | |
513 | */ | |
514 | void blk_ref(BlockBackend *blk) | |
515 | { | |
5ca9d21b | 516 | assert(blk->refcnt > 0); |
0439c5a4 | 517 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
518 | blk->refcnt++; |
519 | } | |
520 | ||
521 | /* | |
522 | * Decrement @blk's reference count. | |
523 | * If this drops it to zero, destroy @blk. | |
524 | * For convenience, do nothing if @blk is null. | |
525 | */ | |
526 | void blk_unref(BlockBackend *blk) | |
527 | { | |
0439c5a4 | 528 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
529 | if (blk) { |
530 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
531 | if (blk->refcnt > 1) { |
532 | blk->refcnt--; | |
533 | } else { | |
534 | blk_drain(blk); | |
535 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
536 | assert(blk->refcnt == 1); | |
537 | blk->refcnt = 0; | |
26f54e9a MA |
538 | blk_delete(blk); |
539 | } | |
540 | } | |
541 | } | |
542 | ||
2cf22d6a HR |
543 | /* |
544 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
545 | * ones which are hidden (i.e. are not referenced by the monitor). | |
546 | */ | |
a429b9b5 | 547 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a | 548 | { |
0439c5a4 | 549 | GLOBAL_STATE_CODE(); |
2cf22d6a HR |
550 | return blk ? QTAILQ_NEXT(blk, link) |
551 | : QTAILQ_FIRST(&block_backends); | |
552 | } | |
553 | ||
d8da3cef HR |
554 | void blk_remove_all_bs(void) |
555 | { | |
74d1b8fc | 556 | BlockBackend *blk = NULL; |
d8da3cef | 557 | |
0439c5a4 EGE |
558 | GLOBAL_STATE_CODE(); |
559 | ||
2cf22d6a | 560 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
561 | AioContext *ctx = blk_get_aio_context(blk); |
562 | ||
563 | aio_context_acquire(ctx); | |
f21d96d0 | 564 | if (blk->root) { |
d8da3cef HR |
565 | blk_remove_bs(blk); |
566 | } | |
567 | aio_context_release(ctx); | |
568 | } | |
569 | } | |
570 | ||
26f54e9a | 571 | /* |
9492b0b9 | 572 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
573 | * If @blk is null, return the first one. |
574 | * Else, return @blk's next sibling, which may be null. | |
575 | * | |
576 | * To iterate over all BlockBackends, do | |
577 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
578 | * ... | |
579 | * } | |
580 | */ | |
581 | BlockBackend *blk_next(BlockBackend *blk) | |
582 | { | |
0439c5a4 | 583 | GLOBAL_STATE_CODE(); |
9492b0b9 HR |
584 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
585 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
586 | } |
587 | ||
7c8eece4 KW |
588 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
589 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 590 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 591 | { |
5e003f17 HR |
592 | BlockDriverState *bs, *old_bs; |
593 | ||
594 | /* Must be called from the main loop */ | |
595 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 596 | |
7c8eece4 KW |
597 | /* First, return all root nodes of BlockBackends. In order to avoid |
598 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
599 | * if the BB is the first one in the parent list of the BDS. */ | |
600 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
601 | BlockBackend *old_blk = it->blk; |
602 | ||
603 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
604 | ||
7c8eece4 KW |
605 | do { |
606 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
607 | bs = it->blk ? blk_bs(it->blk) : NULL; |
608 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 609 | |
5e003f17 HR |
610 | if (it->blk) { |
611 | blk_ref(it->blk); | |
612 | } | |
613 | blk_unref(old_blk); | |
614 | ||
88be7b4b | 615 | if (bs) { |
5e003f17 HR |
616 | bdrv_ref(bs); |
617 | bdrv_unref(old_bs); | |
88be7b4b | 618 | return bs; |
7c8eece4 KW |
619 | } |
620 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
621 | } else { |
622 | old_bs = it->bs; | |
7c8eece4 KW |
623 | } |
624 | ||
625 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
626 | * BDSes that are attached to a BlockBackend here; they have been handled | |
627 | * by the above block already */ | |
981f4f57 | 628 | do { |
7c8eece4 | 629 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
630 | bs = it->bs; |
631 | } while (bs && bdrv_has_blk(bs)); | |
632 | ||
5e003f17 HR |
633 | if (bs) { |
634 | bdrv_ref(bs); | |
635 | } | |
636 | bdrv_unref(old_bs); | |
637 | ||
88be7b4b KW |
638 | return bs; |
639 | } | |
640 | ||
5e003f17 | 641 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
642 | { |
643 | *it = (BdrvNextIterator) { | |
644 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
645 | }; | |
5e003f17 | 646 | } |
981f4f57 | 647 | |
5e003f17 HR |
648 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
649 | { | |
0439c5a4 | 650 | GLOBAL_STATE_CODE(); |
5e003f17 | 651 | bdrv_next_reset(it); |
88be7b4b | 652 | return bdrv_next(it); |
981f4f57 HR |
653 | } |
654 | ||
5e003f17 HR |
655 | /* Must be called when aborting a bdrv_next() iteration before |
656 | * bdrv_next() returns NULL */ | |
657 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
658 | { | |
659 | /* Must be called from the main loop */ | |
660 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
661 | ||
662 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
663 | if (it->blk) { | |
664 | bdrv_unref(blk_bs(it->blk)); | |
665 | blk_unref(it->blk); | |
666 | } | |
667 | } else { | |
668 | bdrv_unref(it->bs); | |
669 | } | |
670 | ||
671 | bdrv_next_reset(it); | |
672 | } | |
673 | ||
e5e78550 HR |
674 | /* |
675 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
676 | * the given @name acting as the handle for the monitor. | |
677 | * Strictly for use by blockdev.c. | |
678 | * | |
679 | * @name must not be null or empty. | |
680 | * | |
681 | * Returns true on success and false on failure. In the latter case, an Error | |
682 | * object is returned through @errp. | |
683 | */ | |
684 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
685 | { | |
686 | assert(!blk->name); | |
687 | assert(name && name[0]); | |
0439c5a4 | 688 | GLOBAL_STATE_CODE(); |
e5e78550 HR |
689 | |
690 | if (!id_wellformed(name)) { | |
691 | error_setg(errp, "Invalid device name"); | |
692 | return false; | |
693 | } | |
694 | if (blk_by_name(name)) { | |
695 | error_setg(errp, "Device with id '%s' already exists", name); | |
696 | return false; | |
697 | } | |
698 | if (bdrv_find_node(name)) { | |
699 | error_setg(errp, | |
700 | "Device name '%s' conflicts with an existing node name", | |
701 | name); | |
702 | return false; | |
703 | } | |
704 | ||
705 | blk->name = g_strdup(name); | |
706 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
707 | return true; | |
708 | } | |
709 | ||
710 | /* | |
711 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
712 | * Strictly for use by blockdev.c. | |
713 | */ | |
714 | void monitor_remove_blk(BlockBackend *blk) | |
715 | { | |
0439c5a4 EGE |
716 | GLOBAL_STATE_CODE(); |
717 | ||
e5e78550 HR |
718 | if (!blk->name) { |
719 | return; | |
720 | } | |
721 | ||
722 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
723 | g_free(blk->name); | |
724 | blk->name = NULL; | |
725 | } | |
726 | ||
26f54e9a | 727 | /* |
7e7d56d9 | 728 | * Return @blk's name, a non-null string. |
e5e78550 | 729 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 730 | */ |
0731a50f | 731 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 732 | { |
37868b2a | 733 | IO_CODE(); |
e5e78550 | 734 | return blk->name ?: ""; |
26f54e9a MA |
735 | } |
736 | ||
737 | /* | |
738 | * Return the BlockBackend with name @name if it exists, else null. | |
739 | * @name must not be null. | |
740 | */ | |
741 | BlockBackend *blk_by_name(const char *name) | |
742 | { | |
74d1b8fc | 743 | BlockBackend *blk = NULL; |
26f54e9a | 744 | |
0439c5a4 | 745 | GLOBAL_STATE_CODE(); |
26f54e9a | 746 | assert(name); |
74d1b8fc | 747 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
748 | if (!strcmp(name, blk->name)) { |
749 | return blk; | |
750 | } | |
751 | } | |
752 | return NULL; | |
753 | } | |
7e7d56d9 MA |
754 | |
755 | /* | |
756 | * Return the BlockDriverState attached to @blk if any, else null. | |
757 | */ | |
758 | BlockDriverState *blk_bs(BlockBackend *blk) | |
759 | { | |
37868b2a | 760 | IO_CODE(); |
f21d96d0 | 761 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
762 | } |
763 | ||
7c8eece4 | 764 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
765 | { |
766 | BdrvChild *child; | |
bdb73476 EGE |
767 | |
768 | GLOBAL_STATE_CODE(); | |
769 | ||
dde33812 | 770 | QLIST_FOREACH(child, &bs->parents, next_parent) { |
bd86fb99 | 771 | if (child->klass == &child_root) { |
7c8eece4 | 772 | return child->opaque; |
dde33812 KW |
773 | } |
774 | } | |
775 | ||
7c8eece4 KW |
776 | return NULL; |
777 | } | |
778 | ||
779 | /* | |
780 | * Returns true if @bs has an associated BlockBackend. | |
781 | */ | |
782 | bool bdrv_has_blk(BlockDriverState *bs) | |
783 | { | |
0439c5a4 | 784 | GLOBAL_STATE_CODE(); |
7c8eece4 | 785 | return bdrv_first_blk(bs) != NULL; |
dde33812 KW |
786 | } |
787 | ||
b6c1bae5 KW |
788 | /* |
789 | * Returns true if @bs has only BlockBackends as parents. | |
790 | */ | |
791 | bool bdrv_is_root_node(BlockDriverState *bs) | |
792 | { | |
793 | BdrvChild *c; | |
794 | ||
0439c5a4 | 795 | GLOBAL_STATE_CODE(); |
b6c1bae5 | 796 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
bd86fb99 | 797 | if (c->klass != &child_root) { |
b6c1bae5 KW |
798 | return false; |
799 | } | |
800 | } | |
801 | ||
802 | return true; | |
803 | } | |
804 | ||
18e46a03 MA |
805 | /* |
806 | * Return @blk's DriveInfo if any, else null. | |
807 | */ | |
808 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
809 | { | |
c5be7445 | 810 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
811 | return blk->legacy_dinfo; |
812 | } | |
813 | ||
814 | /* | |
815 | * Set @blk's DriveInfo to @dinfo, and return it. | |
816 | * @blk must not have a DriveInfo set already. | |
817 | * No other BlockBackend may have the same DriveInfo set. | |
818 | */ | |
819 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
820 | { | |
821 | assert(!blk->legacy_dinfo); | |
c5be7445 | 822 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
823 | return blk->legacy_dinfo = dinfo; |
824 | } | |
825 | ||
826 | /* | |
827 | * Return the BlockBackend with DriveInfo @dinfo. | |
828 | * It must exist. | |
829 | */ | |
830 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
831 | { | |
74d1b8fc | 832 | BlockBackend *blk = NULL; |
c5be7445 | 833 | GLOBAL_STATE_CODE(); |
18e46a03 | 834 | |
74d1b8fc | 835 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
836 | if (blk->legacy_dinfo == dinfo) { |
837 | return blk; | |
838 | } | |
839 | } | |
840 | abort(); | |
841 | } | |
842 | ||
f2cd875d KW |
843 | /* |
844 | * Returns a pointer to the publicly accessible fields of @blk. | |
845 | */ | |
846 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
847 | { | |
0439c5a4 | 848 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
849 | return &blk->public; |
850 | } | |
851 | ||
852 | /* | |
853 | * Returns a BlockBackend given the associated @public fields. | |
854 | */ | |
855 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
856 | { | |
0439c5a4 | 857 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
858 | return container_of(public, BlockBackend, public); |
859 | } | |
860 | ||
1c95f7e1 HR |
861 | /* |
862 | * Disassociates the currently associated BlockDriverState from @blk. | |
863 | */ | |
864 | void blk_remove_bs(BlockBackend *blk) | |
865 | { | |
c89bcf3a | 866 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
e6cada92 | 867 | BdrvChild *root; |
022cdc9f | 868 | |
0439c5a4 EGE |
869 | GLOBAL_STATE_CODE(); |
870 | ||
3301f6c6 | 871 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 872 | if (tgm->throttle_state) { |
1e3552db SH |
873 | BlockDriverState *bs = blk_bs(blk); |
874 | ||
875 | /* | |
876 | * Take a ref in case blk_bs() changes across bdrv_drained_begin(), for | |
877 | * example, if a temporary filter node is removed by a blockjob. | |
878 | */ | |
879 | bdrv_ref(bs); | |
632a7735 | 880 | bdrv_drained_begin(bs); |
c89bcf3a AG |
881 | throttle_group_detach_aio_context(tgm); |
882 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 883 | bdrv_drained_end(bs); |
1e3552db | 884 | bdrv_unref(bs); |
a5614993 | 885 | } |
1c95f7e1 | 886 | |
7ca7f0f6 KW |
887 | blk_update_root_state(blk); |
888 | ||
f45280cb GK |
889 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
890 | * switch to a completion coroutine later on. Let's drain all I/O here | |
891 | * to avoid that and a potential QEMU crash. | |
892 | */ | |
893 | blk_drain(blk); | |
e6cada92 | 894 | root = blk->root; |
f21d96d0 | 895 | blk->root = NULL; |
e6cada92 | 896 | bdrv_root_unref_child(root); |
1c95f7e1 HR |
897 | } |
898 | ||
0c3c36d6 HR |
899 | /* |
900 | * Associates a new BlockDriverState with @blk. | |
901 | */ | |
d7086422 | 902 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 903 | { |
c89bcf3a | 904 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
0439c5a4 | 905 | GLOBAL_STATE_CODE(); |
b441dc71 | 906 | bdrv_ref(bs); |
1f38f04e HR |
907 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
908 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
228ca37e | 909 | blk->perm, blk->shared_perm, |
1f38f04e | 910 | blk, errp); |
d7086422 KW |
911 | if (blk->root == NULL) { |
912 | return -EPERM; | |
913 | } | |
3301f6c6 HR |
914 | |
915 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
916 | if (tgm->throttle_state) { |
917 | throttle_group_detach_aio_context(tgm); | |
918 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 919 | } |
d7086422 KW |
920 | |
921 | return 0; | |
0c3c36d6 HR |
922 | } |
923 | ||
ed089506 VSO |
924 | /* |
925 | * Change BlockDriverState associated with @blk. | |
926 | */ | |
927 | int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp) | |
928 | { | |
0439c5a4 | 929 | GLOBAL_STATE_CODE(); |
ed089506 VSO |
930 | return bdrv_replace_child_bs(blk->root, new_bs, errp); |
931 | } | |
932 | ||
981776b3 KW |
933 | /* |
934 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
935 | */ | |
936 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
937 | Error **errp) | |
938 | { | |
939 | int ret; | |
0439c5a4 | 940 | GLOBAL_STATE_CODE(); |
981776b3 | 941 | |
d35ff5e6 | 942 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
943 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
944 | if (ret < 0) { | |
945 | return ret; | |
946 | } | |
947 | } | |
948 | ||
949 | blk->perm = perm; | |
950 | blk->shared_perm = shared_perm; | |
951 | ||
952 | return 0; | |
953 | } | |
954 | ||
887354bd KW |
955 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
956 | { | |
0439c5a4 | 957 | GLOBAL_STATE_CODE(); |
887354bd KW |
958 | *perm = blk->perm; |
959 | *shared_perm = blk->shared_perm; | |
960 | } | |
961 | ||
d09ea2d2 TH |
962 | /* |
963 | * Attach device model @dev to @blk. | |
964 | * Return 0 on success, -EBUSY when a device model is attached already. | |
965 | */ | |
966 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
4be74634 | 967 | { |
0439c5a4 | 968 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
969 | if (blk->dev) { |
970 | return -EBUSY; | |
971 | } | |
d35ff5e6 KW |
972 | |
973 | /* While migration is still incoming, we don't need to apply the | |
974 | * permissions of guest device BlockBackends. We might still have a block | |
975 | * job or NBD server writing to the image for storage migration. */ | |
976 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
977 | blk->disable_perm = true; | |
978 | } | |
979 | ||
84ebe375 | 980 | blk_ref(blk); |
a7f53e26 | 981 | blk->dev = dev; |
373340b2 | 982 | blk_iostatus_reset(blk); |
d35ff5e6 | 983 | |
a7f53e26 | 984 | return 0; |
4be74634 MA |
985 | } |
986 | ||
a7f53e26 MA |
987 | /* |
988 | * Detach device model @dev from @blk. | |
989 | * @dev must be currently attached to @blk. | |
990 | */ | |
d09ea2d2 | 991 | void blk_detach_dev(BlockBackend *blk, DeviceState *dev) |
4be74634 | 992 | { |
a7f53e26 | 993 | assert(blk->dev == dev); |
0439c5a4 | 994 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
995 | blk->dev = NULL; |
996 | blk->dev_ops = NULL; | |
997 | blk->dev_opaque = NULL; | |
981776b3 | 998 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 999 | blk_unref(blk); |
4be74634 MA |
1000 | } |
1001 | ||
a7f53e26 MA |
1002 | /* |
1003 | * Return the device model attached to @blk if any, else null. | |
1004 | */ | |
d09ea2d2 | 1005 | DeviceState *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 | 1006 | { |
0439c5a4 | 1007 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1008 | return blk->dev; |
1009 | } | |
1010 | ||
2d76e724 KW |
1011 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
1012 | * device attached to the BlockBackend. */ | |
77beef83 | 1013 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 | 1014 | { |
d09ea2d2 | 1015 | DeviceState *dev = blk->dev; |
37868b2a | 1016 | IO_CODE(); |
2d76e724 KW |
1017 | |
1018 | if (!dev) { | |
1019 | return g_strdup(""); | |
1020 | } else if (dev->id) { | |
1021 | return g_strdup(dev->id); | |
1022 | } | |
602414d1 LM |
1023 | |
1024 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
1025 | } |
1026 | ||
1c89e1fa KW |
1027 | /* |
1028 | * Return the BlockBackend which has the device model @dev attached if it | |
1029 | * exists, else null. | |
1030 | * | |
1031 | * @dev must not be null. | |
1032 | */ | |
1033 | BlockBackend *blk_by_dev(void *dev) | |
1034 | { | |
1035 | BlockBackend *blk = NULL; | |
1036 | ||
0439c5a4 EGE |
1037 | GLOBAL_STATE_CODE(); |
1038 | ||
1c89e1fa KW |
1039 | assert(dev != NULL); |
1040 | while ((blk = blk_all_next(blk)) != NULL) { | |
1041 | if (blk->dev == dev) { | |
1042 | return blk; | |
1043 | } | |
1044 | } | |
1045 | return NULL; | |
1046 | } | |
1047 | ||
a7f53e26 MA |
1048 | /* |
1049 | * Set @blk's device model callbacks to @ops. | |
1050 | * @opaque is the opaque argument to pass to the callbacks. | |
1051 | * This is for use by device models. | |
1052 | */ | |
1053 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
1054 | void *opaque) | |
1055 | { | |
0439c5a4 | 1056 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1057 | blk->dev_ops = ops; |
1058 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
1059 | |
1060 | /* Are we currently quiesced? Should we enforce this right now? */ | |
ac1fc3a3 | 1061 | if (blk->quiesce_counter && ops && ops->drained_begin) { |
f4d9cc88 JS |
1062 | ops->drained_begin(opaque); |
1063 | } | |
a7f53e26 MA |
1064 | } |
1065 | ||
1066 | /* | |
1067 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
1068 | * |
1069 | * If @load is true, notify of media load. This action can fail, meaning that | |
1070 | * the medium cannot be loaded. @errp is set then. | |
1071 | * | |
1072 | * If @load is false, notify of media eject. This can never fail. | |
1073 | * | |
a7f53e26 MA |
1074 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
1075 | */ | |
39829a01 | 1076 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 | 1077 | { |
0439c5a4 | 1078 | GLOBAL_STATE_CODE(); |
a7f53e26 | 1079 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { |
f1f57066 | 1080 | bool tray_was_open, tray_is_open; |
39829a01 | 1081 | Error *local_err = NULL; |
a7f53e26 | 1082 | |
f1f57066 | 1083 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
1084 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
1085 | if (local_err) { | |
1086 | assert(load == true); | |
1087 | error_propagate(errp, local_err); | |
1088 | return; | |
1089 | } | |
f1f57066 HR |
1090 | tray_is_open = blk_dev_is_tray_open(blk); |
1091 | ||
1092 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 1093 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 1094 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 1095 | g_free(id); |
a7f53e26 MA |
1096 | } |
1097 | } | |
1098 | } | |
1099 | ||
5c8cab48 KW |
1100 | static void blk_root_change_media(BdrvChild *child, bool load) |
1101 | { | |
39829a01 | 1102 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
1103 | } |
1104 | ||
a7f53e26 MA |
1105 | /* |
1106 | * Does @blk's attached device model have removable media? | |
1107 | * %true if no device model is attached. | |
1108 | */ | |
1109 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
1110 | { | |
b4ad82aa | 1111 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1112 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); |
1113 | } | |
1114 | ||
8f3a73bc HR |
1115 | /* |
1116 | * Does @blk's attached device model have a tray? | |
1117 | */ | |
1118 | bool blk_dev_has_tray(BlockBackend *blk) | |
1119 | { | |
967d7905 | 1120 | IO_CODE(); |
8f3a73bc HR |
1121 | return blk->dev_ops && blk->dev_ops->is_tray_open; |
1122 | } | |
1123 | ||
a7f53e26 MA |
1124 | /* |
1125 | * Notify @blk's attached device model of a media eject request. | |
1126 | * If @force is true, the medium is about to be yanked out forcefully. | |
1127 | */ | |
1128 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1129 | { |
b4ad82aa | 1130 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1131 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1132 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1133 | } | |
4be74634 MA |
1134 | } |
1135 | ||
a7f53e26 MA |
1136 | /* |
1137 | * Does @blk's attached device model have a tray, and is it open? | |
1138 | */ | |
1139 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1140 | { |
967d7905 | 1141 | IO_CODE(); |
8f3a73bc | 1142 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1143 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1144 | } | |
1145 | return false; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * Does @blk's attached device model have the medium locked? | |
1150 | * %false if the device model has no such lock. | |
1151 | */ | |
1152 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1153 | { | |
b4ad82aa | 1154 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1155 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { |
1156 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1157 | } | |
1158 | return false; | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * Notify @blk's attached device model of a backend size change. | |
1163 | */ | |
5c8cab48 | 1164 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1165 | { |
5c8cab48 KW |
1166 | BlockBackend *blk = child->opaque; |
1167 | ||
a7f53e26 MA |
1168 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1169 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | void blk_iostatus_enable(BlockBackend *blk) | |
1174 | { | |
0439c5a4 | 1175 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1176 | blk->iostatus_enabled = true; |
1177 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1178 | } | |
1179 | ||
1180 | /* The I/O status is only enabled if the drive explicitly | |
1181 | * enables it _and_ the VM is configured to stop on errors */ | |
1182 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1183 | { | |
37868b2a | 1184 | IO_CODE(); |
373340b2 HR |
1185 | return (blk->iostatus_enabled && |
1186 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1187 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1188 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1189 | } | |
1190 | ||
1191 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1192 | { | |
0439c5a4 | 1193 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1194 | return blk->iostatus; |
1195 | } | |
1196 | ||
1197 | void blk_iostatus_disable(BlockBackend *blk) | |
1198 | { | |
0439c5a4 | 1199 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1200 | blk->iostatus_enabled = false; |
1201 | } | |
1202 | ||
1203 | void blk_iostatus_reset(BlockBackend *blk) | |
1204 | { | |
0439c5a4 | 1205 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1206 | if (blk_iostatus_is_enabled(blk)) { |
1207 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
373340b2 HR |
1208 | } |
1209 | } | |
1210 | ||
1211 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1212 | { | |
37868b2a | 1213 | IO_CODE(); |
373340b2 HR |
1214 | assert(blk_iostatus_is_enabled(blk)); |
1215 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1216 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1217 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1218 | } | |
4be74634 MA |
1219 | } |
1220 | ||
c10c9d96 KW |
1221 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1222 | { | |
37868b2a | 1223 | IO_CODE(); |
c10c9d96 KW |
1224 | blk->allow_write_beyond_eof = allow; |
1225 | } | |
1226 | ||
980b0f94 KW |
1227 | void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow) |
1228 | { | |
37868b2a | 1229 | IO_CODE(); |
980b0f94 KW |
1230 | blk->allow_aio_context_change = allow; |
1231 | } | |
1232 | ||
cf312932 KW |
1233 | void blk_set_disable_request_queuing(BlockBackend *blk, bool disable) |
1234 | { | |
37868b2a | 1235 | IO_CODE(); |
cf312932 KW |
1236 | blk->disable_request_queuing = disable; |
1237 | } | |
1238 | ||
e7f7d676 | 1239 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
7242db63 | 1240 | int64_t bytes) |
e7f7d676 HR |
1241 | { |
1242 | int64_t len; | |
1243 | ||
aa78b825 | 1244 | if (bytes < 0) { |
e7f7d676 HR |
1245 | return -EIO; |
1246 | } | |
1247 | ||
c09ba36c | 1248 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
1249 | return -ENOMEDIUM; |
1250 | } | |
1251 | ||
e7f7d676 HR |
1252 | if (offset < 0) { |
1253 | return -EIO; | |
1254 | } | |
1255 | ||
c10c9d96 KW |
1256 | if (!blk->allow_write_beyond_eof) { |
1257 | len = blk_getlength(blk); | |
1258 | if (len < 0) { | |
1259 | return len; | |
1260 | } | |
1261 | ||
7242db63 | 1262 | if (offset > len || len - offset < bytes) { |
c10c9d96 KW |
1263 | return -EIO; |
1264 | } | |
e7f7d676 HR |
1265 | } |
1266 | ||
1267 | return 0; | |
1268 | } | |
1269 | ||
7f16476f | 1270 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
cf312932 KW |
1271 | static void coroutine_fn blk_wait_while_drained(BlockBackend *blk) |
1272 | { | |
7f16476f KW |
1273 | assert(blk->in_flight > 0); |
1274 | ||
cf312932 | 1275 | if (blk->quiesce_counter && !blk->disable_request_queuing) { |
7f16476f | 1276 | blk_dec_in_flight(blk); |
cf312932 | 1277 | qemu_co_queue_wait(&blk->queued_requests, NULL); |
7f16476f | 1278 | blk_inc_in_flight(blk); |
cf312932 KW |
1279 | } |
1280 | } | |
1281 | ||
fbb92b67 | 1282 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
d1d3fc3d AF |
1283 | static int coroutine_fn |
1284 | blk_co_do_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, | |
1285 | QEMUIOVector *qiov, size_t qiov_offset, | |
1286 | BdrvRequestFlags flags) | |
4be74634 | 1287 | { |
1e98fefd | 1288 | int ret; |
cf312932 | 1289 | BlockDriverState *bs; |
1581a70d | 1290 | IO_CODE(); |
1e98fefd | 1291 | |
cf312932 | 1292 | blk_wait_while_drained(blk); |
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 | ||
fbb92b67 | 1317 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
95479077 | 1318 | int64_t bytes, QEMUIOVector *qiov, |
fbb92b67 KW |
1319 | BdrvRequestFlags flags) |
1320 | { | |
1321 | int ret; | |
37868b2a | 1322 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1323 | |
1324 | blk_inc_in_flight(blk); | |
d1d3fc3d AF |
1325 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, 0, flags); |
1326 | blk_dec_in_flight(blk); | |
1327 | ||
1328 | return ret; | |
1329 | } | |
1330 | ||
1331 | int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset, | |
1332 | int64_t bytes, QEMUIOVector *qiov, | |
1333 | size_t qiov_offset, BdrvRequestFlags flags) | |
1334 | { | |
1335 | int ret; | |
1336 | IO_OR_GS_CODE(); | |
1337 | ||
1338 | blk_inc_in_flight(blk); | |
1339 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, qiov_offset, flags); | |
fbb92b67 KW |
1340 | blk_dec_in_flight(blk); |
1341 | ||
1342 | return ret; | |
1343 | } | |
1344 | ||
1345 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ | |
16d36e29 | 1346 | int coroutine_fn |
70e8775e VSO |
1347 | blk_co_do_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, |
1348 | QEMUIOVector *qiov, size_t qiov_offset, | |
1349 | BdrvRequestFlags flags) | |
a8823a3b | 1350 | { |
bfd18d1e | 1351 | int ret; |
cf312932 | 1352 | BlockDriverState *bs; |
1581a70d | 1353 | IO_CODE(); |
bfd18d1e | 1354 | |
cf312932 | 1355 | blk_wait_while_drained(blk); |
bfd18d1e | 1356 | |
cf312932 KW |
1357 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1358 | bs = blk_bs(blk); | |
99723548 | 1359 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1360 | |
bfd18d1e | 1361 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1362 | if (ret < 0) { |
1363 | return ret; | |
1364 | } | |
1365 | ||
99723548 | 1366 | bdrv_inc_in_flight(bs); |
441565b2 | 1367 | /* throttling disk I/O */ |
022cdc9f MP |
1368 | if (blk->public.throttle_group_member.throttle_state) { |
1369 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1370 | bytes, true); | |
441565b2 KW |
1371 | } |
1372 | ||
bfd18d1e KW |
1373 | if (!blk->enable_write_cache) { |
1374 | flags |= BDRV_REQ_FUA; | |
1375 | } | |
1376 | ||
b3016864 VSO |
1377 | ret = bdrv_co_pwritev_part(blk->root, offset, bytes, qiov, qiov_offset, |
1378 | flags); | |
99723548 PB |
1379 | bdrv_dec_in_flight(bs); |
1380 | return ret; | |
a8823a3b KW |
1381 | } |
1382 | ||
fbb92b67 | 1383 | int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset, |
34460feb | 1384 | int64_t bytes, |
fbb92b67 KW |
1385 | QEMUIOVector *qiov, size_t qiov_offset, |
1386 | BdrvRequestFlags flags) | |
1387 | { | |
1388 | int ret; | |
37868b2a | 1389 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1390 | |
1391 | blk_inc_in_flight(blk); | |
70e8775e | 1392 | ret = blk_co_do_pwritev_part(blk, offset, bytes, qiov, qiov_offset, flags); |
fbb92b67 KW |
1393 | blk_dec_in_flight(blk); |
1394 | ||
1395 | return ret; | |
1396 | } | |
1397 | ||
b3016864 | 1398 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
34460feb | 1399 | int64_t bytes, QEMUIOVector *qiov, |
b3016864 VSO |
1400 | BdrvRequestFlags flags) |
1401 | { | |
37868b2a | 1402 | IO_OR_GS_CODE(); |
b3016864 VSO |
1403 | return blk_co_pwritev_part(blk, offset, bytes, qiov, 0, flags); |
1404 | } | |
1405 | ||
1bf1cbc9 KW |
1406 | typedef struct BlkRwCo { |
1407 | BlockBackend *blk; | |
1408 | int64_t offset; | |
c060332c | 1409 | void *iobuf; |
1bf1cbc9 KW |
1410 | int ret; |
1411 | BdrvRequestFlags flags; | |
1412 | } BlkRwCo; | |
1413 | ||
720ff280 KW |
1414 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1415 | { | |
0439c5a4 | 1416 | GLOBAL_STATE_CODE(); |
720ff280 KW |
1417 | return bdrv_make_zero(blk->root, flags); |
1418 | } | |
1419 | ||
c90e2a9c | 1420 | void blk_inc_in_flight(BlockBackend *blk) |
33f2a757 | 1421 | { |
37868b2a | 1422 | IO_CODE(); |
d73415a3 | 1423 | qatomic_inc(&blk->in_flight); |
33f2a757 SH |
1424 | } |
1425 | ||
c90e2a9c | 1426 | void blk_dec_in_flight(BlockBackend *blk) |
33f2a757 | 1427 | { |
37868b2a | 1428 | IO_CODE(); |
d73415a3 | 1429 | qatomic_dec(&blk->in_flight); |
cfe29d82 | 1430 | aio_wait_kick(); |
33f2a757 SH |
1431 | } |
1432 | ||
e7f7d676 HR |
1433 | static void error_callback_bh(void *opaque) |
1434 | { | |
1435 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1436 | |
33f2a757 | 1437 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1438 | acb->common.cb(acb->common.opaque, acb->ret); |
1439 | qemu_aio_unref(acb); | |
1440 | } | |
1441 | ||
ca78ecfa PL |
1442 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1443 | BlockCompletionFunc *cb, | |
1444 | void *opaque, int ret) | |
e7f7d676 HR |
1445 | { |
1446 | struct BlockBackendAIOCB *acb; | |
37868b2a | 1447 | IO_CODE(); |
e7f7d676 | 1448 | |
33f2a757 | 1449 | blk_inc_in_flight(blk); |
e7f7d676 | 1450 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1451 | acb->blk = blk; |
e7f7d676 HR |
1452 | acb->ret = ret; |
1453 | ||
e4ec5ad4 PD |
1454 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1455 | error_callback_bh, acb); | |
e7f7d676 HR |
1456 | return &acb->common; |
1457 | } | |
1458 | ||
57d6a428 KW |
1459 | typedef struct BlkAioEmAIOCB { |
1460 | BlockAIOCB common; | |
1461 | BlkRwCo rwco; | |
a93d81c8 | 1462 | int64_t bytes; |
57d6a428 | 1463 | bool has_returned; |
57d6a428 KW |
1464 | } BlkAioEmAIOCB; |
1465 | ||
1d719ddc SH |
1466 | static AioContext *blk_aio_em_aiocb_get_aio_context(BlockAIOCB *acb_) |
1467 | { | |
1468 | BlkAioEmAIOCB *acb = container_of(acb_, BlkAioEmAIOCB, common); | |
1469 | ||
1470 | return blk_get_aio_context(acb->rwco.blk); | |
1471 | } | |
1472 | ||
57d6a428 KW |
1473 | static const AIOCBInfo blk_aio_em_aiocb_info = { |
1474 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1d719ddc | 1475 | .get_aio_context = blk_aio_em_aiocb_get_aio_context, |
57d6a428 KW |
1476 | }; |
1477 | ||
1478 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1479 | { | |
57d6a428 KW |
1480 | if (acb->has_returned) { |
1481 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1482 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1483 | qemu_aio_unref(acb); |
1484 | } | |
1485 | } | |
1486 | ||
1487 | static void blk_aio_complete_bh(void *opaque) | |
1488 | { | |
fffb6e12 | 1489 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1490 | assert(acb->has_returned); |
1491 | blk_aio_complete(acb); | |
57d6a428 KW |
1492 | } |
1493 | ||
a93d81c8 VSO |
1494 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, |
1495 | int64_t bytes, | |
c060332c | 1496 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1497 | BdrvRequestFlags flags, |
1498 | BlockCompletionFunc *cb, void *opaque) | |
1499 | { | |
1500 | BlkAioEmAIOCB *acb; | |
1501 | Coroutine *co; | |
1502 | ||
33f2a757 | 1503 | blk_inc_in_flight(blk); |
57d6a428 KW |
1504 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1505 | acb->rwco = (BlkRwCo) { | |
1506 | .blk = blk, | |
1507 | .offset = offset, | |
c060332c | 1508 | .iobuf = iobuf, |
57d6a428 KW |
1509 | .flags = flags, |
1510 | .ret = NOT_DONE, | |
1511 | }; | |
7fa84cd8 | 1512 | acb->bytes = bytes; |
57d6a428 KW |
1513 | acb->has_returned = false; |
1514 | ||
0b8b8753 | 1515 | co = qemu_coroutine_create(co_entry, acb); |
e92f0e19 | 1516 | bdrv_coroutine_enter(blk_bs(blk), co); |
57d6a428 KW |
1517 | |
1518 | acb->has_returned = true; | |
1519 | if (acb->rwco.ret != NOT_DONE) { | |
e4ec5ad4 PD |
1520 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1521 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1522 | } |
1523 | ||
1524 | return &acb->common; | |
1525 | } | |
1526 | ||
1527 | static void blk_aio_read_entry(void *opaque) | |
1528 | { | |
1529 | BlkAioEmAIOCB *acb = opaque; | |
1530 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1531 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1532 | |
c060332c | 1533 | assert(qiov->size == acb->bytes); |
d1d3fc3d AF |
1534 | rwco->ret = blk_co_do_preadv_part(rwco->blk, rwco->offset, acb->bytes, qiov, |
1535 | 0, rwco->flags); | |
57d6a428 KW |
1536 | blk_aio_complete(acb); |
1537 | } | |
1538 | ||
1539 | static void blk_aio_write_entry(void *opaque) | |
1540 | { | |
1541 | BlkAioEmAIOCB *acb = opaque; | |
1542 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1543 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1544 | |
c060332c | 1545 | assert(!qiov || qiov->size == acb->bytes); |
70e8775e VSO |
1546 | rwco->ret = blk_co_do_pwritev_part(rwco->blk, rwco->offset, acb->bytes, |
1547 | qiov, 0, rwco->flags); | |
57d6a428 KW |
1548 | blk_aio_complete(acb); |
1549 | } | |
1550 | ||
d004bd52 | 1551 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
a93d81c8 | 1552 | int64_t bytes, BdrvRequestFlags flags, |
d004bd52 | 1553 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1554 | { |
37868b2a | 1555 | IO_CODE(); |
a93d81c8 | 1556 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_write_entry, |
983a1600 | 1557 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); |
4be74634 MA |
1558 | } |
1559 | ||
4be74634 MA |
1560 | int64_t blk_getlength(BlockBackend *blk) |
1561 | { | |
37868b2a | 1562 | IO_CODE(); |
c09ba36c HR |
1563 | if (!blk_is_available(blk)) { |
1564 | return -ENOMEDIUM; | |
1565 | } | |
1566 | ||
f21d96d0 | 1567 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1568 | } |
1569 | ||
1570 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1571 | { | |
37868b2a | 1572 | IO_CODE(); |
f21d96d0 | 1573 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1574 | *nb_sectors_ptr = 0; |
1575 | } else { | |
f21d96d0 | 1576 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1577 | } |
4be74634 MA |
1578 | } |
1579 | ||
1ef01253 HR |
1580 | int64_t blk_nb_sectors(BlockBackend *blk) |
1581 | { | |
37868b2a | 1582 | IO_CODE(); |
c09ba36c HR |
1583 | if (!blk_is_available(blk)) { |
1584 | return -ENOMEDIUM; | |
1585 | } | |
1586 | ||
f21d96d0 | 1587 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1588 | } |
1589 | ||
60cb2fa7 EB |
1590 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1591 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1592 | BlockCompletionFunc *cb, void *opaque) | |
1593 | { | |
37868b2a | 1594 | IO_CODE(); |
a93d81c8 | 1595 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1596 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1597 | blk_aio_read_entry, flags, cb, opaque); | |
1598 | } | |
1599 | ||
60cb2fa7 EB |
1600 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1601 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1602 | BlockCompletionFunc *cb, void *opaque) | |
1603 | { | |
37868b2a | 1604 | IO_CODE(); |
73d4a113 | 1605 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1606 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1607 | blk_aio_write_entry, flags, cb, opaque); | |
1608 | } | |
1609 | ||
4be74634 MA |
1610 | void blk_aio_cancel(BlockAIOCB *acb) |
1611 | { | |
0439c5a4 | 1612 | GLOBAL_STATE_CODE(); |
4be74634 MA |
1613 | bdrv_aio_cancel(acb); |
1614 | } | |
1615 | ||
1616 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1617 | { | |
37868b2a | 1618 | IO_CODE(); |
4be74634 MA |
1619 | bdrv_aio_cancel_async(acb); |
1620 | } | |
1621 | ||
fbb92b67 | 1622 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
16d36e29 | 1623 | int coroutine_fn |
70e8775e | 1624 | blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1625 | { |
1581a70d EGE |
1626 | IO_CODE(); |
1627 | ||
cf312932 KW |
1628 | blk_wait_while_drained(blk); |
1629 | ||
c09ba36c HR |
1630 | if (!blk_is_available(blk)) { |
1631 | return -ENOMEDIUM; | |
1632 | } | |
1633 | ||
48af776a KW |
1634 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1635 | } | |
1636 | ||
16d36e29 | 1637 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
48af776a | 1638 | { |
16d36e29 | 1639 | int ret; |
37868b2a | 1640 | IO_OR_GS_CODE(); |
c060332c | 1641 | |
16d36e29 VSO |
1642 | blk_inc_in_flight(blk); |
1643 | ret = blk_do_ioctl(blk, req, buf); | |
1644 | blk_dec_in_flight(blk); | |
48af776a | 1645 | |
16d36e29 | 1646 | return ret; |
48af776a KW |
1647 | } |
1648 | ||
1649 | static void blk_aio_ioctl_entry(void *opaque) | |
1650 | { | |
1651 | BlkAioEmAIOCB *acb = opaque; | |
1652 | BlkRwCo *rwco = &acb->rwco; | |
1653 | ||
70e8775e | 1654 | rwco->ret = blk_co_do_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
c060332c | 1655 | |
48af776a | 1656 | blk_aio_complete(acb); |
4be74634 MA |
1657 | } |
1658 | ||
1659 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1660 | BlockCompletionFunc *cb, void *opaque) | |
1661 | { | |
37868b2a | 1662 | IO_CODE(); |
c060332c | 1663 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1664 | } |
1665 | ||
fbb92b67 | 1666 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
16d36e29 | 1667 | int coroutine_fn |
70e8775e | 1668 | blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes) |
2bb0dce7 | 1669 | { |
cf312932 | 1670 | int ret; |
1581a70d | 1671 | IO_CODE(); |
cf312932 KW |
1672 | |
1673 | blk_wait_while_drained(blk); | |
1674 | ||
1675 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1676 | if (ret < 0) { |
1677 | return ret; | |
1678 | } | |
1679 | ||
0b9fd3f4 | 1680 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1681 | } |
1682 | ||
564806c5 KW |
1683 | static void blk_aio_pdiscard_entry(void *opaque) |
1684 | { | |
1685 | BlkAioEmAIOCB *acb = opaque; | |
1686 | BlkRwCo *rwco = &acb->rwco; | |
1687 | ||
70e8775e | 1688 | rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes); |
564806c5 KW |
1689 | blk_aio_complete(acb); |
1690 | } | |
1691 | ||
1692 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, | |
a93d81c8 | 1693 | int64_t offset, int64_t bytes, |
564806c5 KW |
1694 | BlockCompletionFunc *cb, void *opaque) |
1695 | { | |
37868b2a | 1696 | IO_CODE(); |
564806c5 KW |
1697 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
1698 | cb, opaque); | |
1699 | } | |
1700 | ||
2800637a VSO |
1701 | int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset, |
1702 | int64_t bytes) | |
fbb92b67 KW |
1703 | { |
1704 | int ret; | |
37868b2a | 1705 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1706 | |
1707 | blk_inc_in_flight(blk); | |
70e8775e | 1708 | ret = blk_co_do_pdiscard(blk, offset, bytes); |
fbb92b67 KW |
1709 | blk_dec_in_flight(blk); |
1710 | ||
1711 | return ret; | |
1712 | } | |
1713 | ||
fbb92b67 | 1714 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
16d36e29 | 1715 | int coroutine_fn blk_co_do_flush(BlockBackend *blk) |
2bb0dce7 | 1716 | { |
cf312932 | 1717 | blk_wait_while_drained(blk); |
1581a70d | 1718 | IO_CODE(); |
cf312932 | 1719 | |
c09ba36c HR |
1720 | if (!blk_is_available(blk)) { |
1721 | return -ENOMEDIUM; | |
1722 | } | |
1723 | ||
f21d96d0 | 1724 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1725 | } |
1726 | ||
564806c5 KW |
1727 | static void blk_aio_flush_entry(void *opaque) |
1728 | { | |
1729 | BlkAioEmAIOCB *acb = opaque; | |
1730 | BlkRwCo *rwco = &acb->rwco; | |
1731 | ||
70e8775e | 1732 | rwco->ret = blk_co_do_flush(rwco->blk); |
564806c5 KW |
1733 | blk_aio_complete(acb); |
1734 | } | |
1735 | ||
1736 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
1737 | BlockCompletionFunc *cb, void *opaque) | |
1738 | { | |
37868b2a | 1739 | IO_CODE(); |
564806c5 KW |
1740 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
1741 | } | |
1742 | ||
fbb92b67 KW |
1743 | int coroutine_fn blk_co_flush(BlockBackend *blk) |
1744 | { | |
1745 | int ret; | |
37868b2a | 1746 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1747 | |
1748 | blk_inc_in_flight(blk); | |
70e8775e | 1749 | ret = blk_co_do_flush(blk); |
fbb92b67 KW |
1750 | blk_dec_in_flight(blk); |
1751 | ||
1752 | return ret; | |
1753 | } | |
1754 | ||
97b0385a AY |
1755 | void blk_drain(BlockBackend *blk) |
1756 | { | |
33f2a757 | 1757 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1758 | GLOBAL_STATE_CODE(); |
33f2a757 SH |
1759 | |
1760 | if (bs) { | |
1e3552db | 1761 | bdrv_ref(bs); |
33f2a757 SH |
1762 | bdrv_drained_begin(bs); |
1763 | } | |
1764 | ||
1765 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 1766 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
d73415a3 | 1767 | qatomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1768 | |
1769 | if (bs) { | |
1770 | bdrv_drained_end(bs); | |
1e3552db | 1771 | bdrv_unref(bs); |
a46fc9c9 | 1772 | } |
97b0385a AY |
1773 | } |
1774 | ||
4be74634 MA |
1775 | void blk_drain_all(void) |
1776 | { | |
33f2a757 SH |
1777 | BlockBackend *blk = NULL; |
1778 | ||
0439c5a4 EGE |
1779 | GLOBAL_STATE_CODE(); |
1780 | ||
33f2a757 SH |
1781 | bdrv_drain_all_begin(); |
1782 | ||
1783 | while ((blk = blk_all_next(blk)) != NULL) { | |
1784 | AioContext *ctx = blk_get_aio_context(blk); | |
1785 | ||
1786 | aio_context_acquire(ctx); | |
1787 | ||
1788 | /* We may have -ENOMEDIUM completions in flight */ | |
d73415a3 | 1789 | AIO_WAIT_WHILE(ctx, qatomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1790 | |
1791 | aio_context_release(ctx); | |
1792 | } | |
1793 | ||
1794 | bdrv_drain_all_end(); | |
4be74634 MA |
1795 | } |
1796 | ||
373340b2 HR |
1797 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1798 | BlockdevOnError on_write_error) | |
1799 | { | |
0439c5a4 | 1800 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1801 | blk->on_read_error = on_read_error; |
1802 | blk->on_write_error = on_write_error; | |
1803 | } | |
1804 | ||
4be74634 MA |
1805 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1806 | { | |
37868b2a | 1807 | IO_CODE(); |
373340b2 | 1808 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1809 | } |
1810 | ||
1811 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1812 | int error) | |
1813 | { | |
373340b2 | 1814 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
37868b2a | 1815 | IO_CODE(); |
373340b2 HR |
1816 | |
1817 | switch (on_err) { | |
1818 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1819 | return (error == ENOSPC) ? | |
1820 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1821 | case BLOCKDEV_ON_ERROR_STOP: | |
1822 | return BLOCK_ERROR_ACTION_STOP; | |
1823 | case BLOCKDEV_ON_ERROR_REPORT: | |
1824 | return BLOCK_ERROR_ACTION_REPORT; | |
1825 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1826 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1827 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1828 | default: |
1829 | abort(); | |
1830 | } | |
4be74634 MA |
1831 | } |
1832 | ||
373340b2 HR |
1833 | static void send_qmp_error_event(BlockBackend *blk, |
1834 | BlockErrorAction action, | |
1835 | bool is_read, int error) | |
1836 | { | |
1837 | IoOperationType optype; | |
bfe1a14c | 1838 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
1839 | |
1840 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
bfe1a14c KW |
1841 | qapi_event_send_block_io_error(blk_name(blk), !!bs, |
1842 | bs ? bdrv_get_node_name(bs) : NULL, optype, | |
2bf7e10f | 1843 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 1844 | error == ENOSPC, strerror(error)); |
373340b2 HR |
1845 | } |
1846 | ||
1847 | /* This is done by device models because, while the block layer knows | |
1848 | * about the error, it does not know whether an operation comes from | |
1849 | * the device or the block layer (from a job, for example). | |
1850 | */ | |
4be74634 MA |
1851 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1852 | bool is_read, int error) | |
1853 | { | |
373340b2 | 1854 | assert(error >= 0); |
37868b2a | 1855 | IO_CODE(); |
373340b2 HR |
1856 | |
1857 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1858 | /* First set the iostatus, so that "info block" returns an iostatus | |
1859 | * that matches the events raised so far (an additional error iostatus | |
1860 | * is fine, but not a lost one). | |
1861 | */ | |
1862 | blk_iostatus_set_err(blk, error); | |
1863 | ||
1864 | /* Then raise the request to stop the VM and the event. | |
1865 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1866 | * it ensures that the STOP event always comes after the | |
1867 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1868 | * can observe the STOP event and do a "cont" before the STOP | |
1869 | * event is issued, the VM will not stop. In this case, vm_start() | |
1870 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1871 | */ | |
1872 | qemu_system_vmstop_request_prepare(); | |
1873 | send_qmp_error_event(blk, action, is_read, error); | |
1874 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1875 | } else { | |
1876 | send_qmp_error_event(blk, action, is_read, error); | |
1877 | } | |
4be74634 MA |
1878 | } |
1879 | ||
86b1cf32 KW |
1880 | /* |
1881 | * Returns true if the BlockBackend can support taking write permissions | |
1882 | * (because its root node is not read-only). | |
1883 | */ | |
1884 | bool blk_supports_write_perm(BlockBackend *blk) | |
4be74634 | 1885 | { |
f21d96d0 | 1886 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1887 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1888 | |
1889 | if (bs) { | |
86b1cf32 | 1890 | return !bdrv_is_read_only(bs); |
061959e8 | 1891 | } else { |
260242a8 | 1892 | return blk->root_state.open_flags & BDRV_O_RDWR; |
061959e8 | 1893 | } |
4be74634 MA |
1894 | } |
1895 | ||
86b1cf32 KW |
1896 | /* |
1897 | * Returns true if the BlockBackend can be written to in its current | |
1898 | * configuration (i.e. if write permission have been requested) | |
1899 | */ | |
1900 | bool blk_is_writable(BlockBackend *blk) | |
1901 | { | |
37868b2a | 1902 | IO_CODE(); |
86b1cf32 KW |
1903 | return blk->perm & BLK_PERM_WRITE; |
1904 | } | |
1905 | ||
96710565 | 1906 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 1907 | { |
f21d96d0 | 1908 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1909 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1910 | |
1911 | if (!bs) { | |
96710565 | 1912 | return false; |
a46fc9c9 HR |
1913 | } |
1914 | ||
f21d96d0 | 1915 | return bdrv_is_sg(bs); |
4be74634 MA |
1916 | } |
1917 | ||
96710565 | 1918 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 1919 | { |
37868b2a | 1920 | IO_CODE(); |
bfd18d1e | 1921 | return blk->enable_write_cache; |
4be74634 MA |
1922 | } |
1923 | ||
1924 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1925 | { | |
0439c5a4 | 1926 | GLOBAL_STATE_CODE(); |
bfd18d1e | 1927 | blk->enable_write_cache = wce; |
4be74634 MA |
1928 | } |
1929 | ||
3b717194 | 1930 | void blk_activate(BlockBackend *blk, Error **errp) |
2bb0dce7 | 1931 | { |
f21d96d0 | 1932 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1933 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1934 | |
1935 | if (!bs) { | |
c09ba36c HR |
1936 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1937 | return; | |
1938 | } | |
1939 | ||
a94750d9 | 1940 | bdrv_activate(bs, errp); |
2bb0dce7 HR |
1941 | } |
1942 | ||
e031f750 | 1943 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1944 | { |
f21d96d0 | 1945 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 1946 | IO_CODE(); |
f21d96d0 KW |
1947 | |
1948 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1949 | } |
1950 | ||
1951 | bool blk_is_available(BlockBackend *blk) | |
1952 | { | |
37868b2a | 1953 | IO_CODE(); |
db0284f8 | 1954 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); |
4be74634 MA |
1955 | } |
1956 | ||
1957 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1958 | { | |
f21d96d0 | 1959 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 1960 | IO_CODE(); |
f21d96d0 KW |
1961 | |
1962 | if (bs) { | |
1963 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1964 | } |
4be74634 MA |
1965 | } |
1966 | ||
1967 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1968 | { | |
f21d96d0 | 1969 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 | 1970 | char *id; |
37868b2a | 1971 | IO_CODE(); |
2d76e724 | 1972 | |
f21d96d0 KW |
1973 | if (bs) { |
1974 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1975 | } |
c47ee043 JS |
1976 | |
1977 | /* Whether or not we ejected on the backend, | |
1978 | * the frontend experienced a tray event. */ | |
1979 | id = blk_get_attached_dev_id(blk); | |
1980 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 1981 | eject_flag); |
c47ee043 | 1982 | g_free(id); |
4be74634 MA |
1983 | } |
1984 | ||
1985 | int blk_get_flags(BlockBackend *blk) | |
1986 | { | |
f21d96d0 | 1987 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1988 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1989 | |
1990 | if (bs) { | |
1991 | return bdrv_get_flags(bs); | |
061959e8 HR |
1992 | } else { |
1993 | return blk->root_state.open_flags; | |
1994 | } | |
4be74634 MA |
1995 | } |
1996 | ||
4841211e EB |
1997 | /* Returns the minimum request alignment, in bytes; guaranteed nonzero */ |
1998 | uint32_t blk_get_request_alignment(BlockBackend *blk) | |
1999 | { | |
2000 | BlockDriverState *bs = blk_bs(blk); | |
37868b2a | 2001 | IO_CODE(); |
4841211e EB |
2002 | return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE; |
2003 | } | |
2004 | ||
24b36e98 PB |
2005 | /* Returns the maximum hardware transfer length, in bytes; guaranteed nonzero */ |
2006 | uint64_t blk_get_max_hw_transfer(BlockBackend *blk) | |
2007 | { | |
2008 | BlockDriverState *bs = blk_bs(blk); | |
2009 | uint64_t max = INT_MAX; | |
37868b2a | 2010 | IO_CODE(); |
24b36e98 PB |
2011 | |
2012 | if (bs) { | |
2013 | max = MIN_NON_ZERO(max, bs->bl.max_hw_transfer); | |
2014 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); | |
2015 | } | |
2016 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); | |
2017 | } | |
2018 | ||
5def6b80 EB |
2019 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
2020 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 2021 | { |
f21d96d0 | 2022 | BlockDriverState *bs = blk_bs(blk); |
b99f7fa0 | 2023 | uint32_t max = INT_MAX; |
37868b2a | 2024 | IO_CODE(); |
f21d96d0 KW |
2025 | |
2026 | if (bs) { | |
b99f7fa0 | 2027 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); |
a46fc9c9 | 2028 | } |
b99f7fa0 | 2029 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); |
454057b7 PL |
2030 | } |
2031 | ||
cc071629 PB |
2032 | int blk_get_max_hw_iov(BlockBackend *blk) |
2033 | { | |
37868b2a | 2034 | IO_CODE(); |
cc071629 PB |
2035 | return MIN_NON_ZERO(blk->root->bs->bl.max_hw_iov, |
2036 | blk->root->bs->bl.max_iov); | |
2037 | } | |
2038 | ||
648296e0 SH |
2039 | int blk_get_max_iov(BlockBackend *blk) |
2040 | { | |
37868b2a | 2041 | IO_CODE(); |
f21d96d0 | 2042 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
2043 | } |
2044 | ||
f1c17521 PB |
2045 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
2046 | { | |
37868b2a | 2047 | IO_CODE(); |
f21d96d0 | 2048 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
2049 | } |
2050 | ||
4be74634 MA |
2051 | void *blk_blockalign(BlockBackend *blk, size_t size) |
2052 | { | |
37868b2a | 2053 | IO_CODE(); |
f21d96d0 | 2054 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
2055 | } |
2056 | ||
2057 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
2058 | { | |
f21d96d0 | 2059 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2060 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2061 | |
2062 | if (!bs) { | |
a46fc9c9 HR |
2063 | return false; |
2064 | } | |
2065 | ||
f21d96d0 | 2066 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
2067 | } |
2068 | ||
2069 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
2070 | { | |
f21d96d0 | 2071 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2072 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2073 | |
2074 | if (bs) { | |
2075 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 2076 | } |
4be74634 MA |
2077 | } |
2078 | ||
2079 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
2080 | { | |
f21d96d0 | 2081 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2082 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2083 | |
2084 | if (bs) { | |
2085 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 2086 | } |
4be74634 MA |
2087 | } |
2088 | ||
2089 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
2090 | { | |
f21d96d0 | 2091 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2092 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2093 | |
2094 | if (bs) { | |
2095 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 2096 | } |
4be74634 MA |
2097 | } |
2098 | ||
2099 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
2100 | { | |
d861ab3a | 2101 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2102 | IO_CODE(); |
d861ab3a | 2103 | |
d861ab3a | 2104 | if (bs) { |
132ada80 KW |
2105 | AioContext *ctx = bdrv_get_aio_context(blk_bs(blk)); |
2106 | assert(ctx == blk->ctx); | |
d861ab3a KW |
2107 | } |
2108 | ||
2109 | return blk->ctx; | |
4981bdec HR |
2110 | } |
2111 | ||
2112 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
2113 | { | |
2114 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
2115 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
2116 | } |
2117 | ||
97896a48 KW |
2118 | static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2119 | bool update_root_node, Error **errp) | |
4be74634 | 2120 | { |
f21d96d0 | 2121 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 2122 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
97896a48 | 2123 | int ret; |
f21d96d0 KW |
2124 | |
2125 | if (bs) { | |
1e3552db SH |
2126 | bdrv_ref(bs); |
2127 | ||
97896a48 KW |
2128 | if (update_root_node) { |
2129 | ret = bdrv_child_try_set_aio_context(bs, new_context, blk->root, | |
2130 | errp); | |
2131 | if (ret < 0) { | |
1e3552db | 2132 | bdrv_unref(bs); |
97896a48 KW |
2133 | return ret; |
2134 | } | |
2135 | } | |
c61791fc | 2136 | if (tgm->throttle_state) { |
dc868fb0 | 2137 | bdrv_drained_begin(bs); |
c61791fc MP |
2138 | throttle_group_detach_aio_context(tgm); |
2139 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 2140 | bdrv_drained_end(bs); |
7ca7f0f6 | 2141 | } |
1e3552db SH |
2142 | |
2143 | bdrv_unref(bs); | |
a46fc9c9 | 2144 | } |
97896a48 | 2145 | |
d861ab3a | 2146 | blk->ctx = new_context; |
97896a48 | 2147 | return 0; |
4be74634 MA |
2148 | } |
2149 | ||
97896a48 KW |
2150 | int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2151 | Error **errp) | |
38475269 | 2152 | { |
0439c5a4 | 2153 | GLOBAL_STATE_CODE(); |
97896a48 | 2154 | return blk_do_set_aio_context(blk, new_context, true, errp); |
38475269 KW |
2155 | } |
2156 | ||
2157 | static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx, | |
2158 | GSList **ignore, Error **errp) | |
2159 | { | |
2160 | BlockBackend *blk = child->opaque; | |
2161 | ||
980b0f94 KW |
2162 | if (blk->allow_aio_context_change) { |
2163 | return true; | |
2164 | } | |
2165 | ||
38475269 KW |
2166 | /* Only manually created BlockBackends that are not attached to anything |
2167 | * can change their AioContext without updating their user. */ | |
2168 | if (!blk->name || blk->dev) { | |
2169 | /* TODO Add BB name/QOM path */ | |
2170 | error_setg(errp, "Cannot change iothread of active block backend"); | |
2171 | return false; | |
2172 | } | |
2173 | ||
2174 | return true; | |
2175 | } | |
2176 | ||
2177 | static void blk_root_set_aio_ctx(BdrvChild *child, AioContext *ctx, | |
2178 | GSList **ignore) | |
2179 | { | |
2180 | BlockBackend *blk = child->opaque; | |
97896a48 | 2181 | blk_do_set_aio_context(blk, ctx, false, &error_abort); |
38475269 KW |
2182 | } |
2183 | ||
2019ba0a HR |
2184 | void blk_add_aio_context_notifier(BlockBackend *blk, |
2185 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
2186 | void (*detach_aio_context)(void *opaque), void *opaque) | |
2187 | { | |
d03654ea | 2188 | BlockBackendAioNotifier *notifier; |
f21d96d0 | 2189 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2190 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2191 | |
d03654ea SH |
2192 | notifier = g_new(BlockBackendAioNotifier, 1); |
2193 | notifier->attached_aio_context = attached_aio_context; | |
2194 | notifier->detach_aio_context = detach_aio_context; | |
2195 | notifier->opaque = opaque; | |
2196 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
2197 | ||
f21d96d0 KW |
2198 | if (bs) { |
2199 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2200 | detach_aio_context, opaque); |
2201 | } | |
2019ba0a HR |
2202 | } |
2203 | ||
2204 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
2205 | void (*attached_aio_context)(AioContext *, | |
2206 | void *), | |
2207 | void (*detach_aio_context)(void *), | |
2208 | void *opaque) | |
2209 | { | |
d03654ea | 2210 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
2211 | BlockDriverState *bs = blk_bs(blk); |
2212 | ||
0439c5a4 EGE |
2213 | GLOBAL_STATE_CODE(); |
2214 | ||
f21d96d0 KW |
2215 | if (bs) { |
2216 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2217 | detach_aio_context, opaque); |
2218 | } | |
d03654ea SH |
2219 | |
2220 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
2221 | if (notifier->attached_aio_context == attached_aio_context && | |
2222 | notifier->detach_aio_context == detach_aio_context && | |
2223 | notifier->opaque == opaque) { | |
2224 | QLIST_REMOVE(notifier, list); | |
2225 | g_free(notifier); | |
2226 | return; | |
2227 | } | |
2228 | } | |
2229 | ||
2230 | abort(); | |
2019ba0a HR |
2231 | } |
2232 | ||
3301f6c6 HR |
2233 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
2234 | { | |
0439c5a4 | 2235 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2236 | notifier_list_add(&blk->remove_bs_notifiers, notify); |
2237 | } | |
2238 | ||
2239 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
2240 | { | |
0439c5a4 | 2241 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2242 | notifier_list_add(&blk->insert_bs_notifiers, notify); |
2243 | } | |
2244 | ||
4be74634 MA |
2245 | void blk_io_plug(BlockBackend *blk) |
2246 | { | |
f21d96d0 | 2247 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2248 | IO_CODE(); |
f21d96d0 KW |
2249 | |
2250 | if (bs) { | |
2251 | bdrv_io_plug(bs); | |
a46fc9c9 | 2252 | } |
4be74634 MA |
2253 | } |
2254 | ||
2255 | void blk_io_unplug(BlockBackend *blk) | |
2256 | { | |
f21d96d0 | 2257 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2258 | IO_CODE(); |
f21d96d0 KW |
2259 | |
2260 | if (bs) { | |
2261 | bdrv_io_unplug(bs); | |
a46fc9c9 | 2262 | } |
4be74634 MA |
2263 | } |
2264 | ||
2265 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
2266 | { | |
37868b2a | 2267 | IO_CODE(); |
7f0e9da6 | 2268 | return &blk->stats; |
4be74634 MA |
2269 | } |
2270 | ||
2271 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
2272 | BlockCompletionFunc *cb, void *opaque) | |
2273 | { | |
37868b2a | 2274 | IO_CODE(); |
4be74634 MA |
2275 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); |
2276 | } | |
1ef01253 | 2277 | |
d004bd52 | 2278 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
34460feb | 2279 | int64_t bytes, BdrvRequestFlags flags) |
1ef01253 | 2280 | { |
37868b2a | 2281 | IO_OR_GS_CODE(); |
f5a5ca79 | 2282 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 2283 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
2284 | } |
2285 | ||
2c9715fa AF |
2286 | int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset, |
2287 | int64_t bytes, const void *buf) | |
1ef01253 | 2288 | { |
06f0325c | 2289 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |
37868b2a | 2290 | IO_OR_GS_CODE(); |
2c9715fa AF |
2291 | return blk_co_pwritev_part(blk, offset, bytes, &qiov, 0, |
2292 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2293 | } |
2294 | ||
c80d8b06 | 2295 | int blk_truncate(BlockBackend *blk, int64_t offset, bool exact, |
8c6242b6 | 2296 | PreallocMode prealloc, BdrvRequestFlags flags, Error **errp) |
1ef01253 | 2297 | { |
37868b2a | 2298 | IO_OR_GS_CODE(); |
c09ba36c | 2299 | if (!blk_is_available(blk)) { |
ed3d2ec9 | 2300 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2301 | return -ENOMEDIUM; |
2302 | } | |
2303 | ||
8c6242b6 | 2304 | return bdrv_truncate(blk->root, offset, exact, prealloc, flags, errp); |
1ef01253 HR |
2305 | } |
2306 | ||
1ef01253 HR |
2307 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, |
2308 | int64_t pos, int size) | |
2309 | { | |
bfd18d1e | 2310 | int ret; |
0439c5a4 | 2311 | GLOBAL_STATE_CODE(); |
bfd18d1e | 2312 | |
c09ba36c HR |
2313 | if (!blk_is_available(blk)) { |
2314 | return -ENOMEDIUM; | |
2315 | } | |
2316 | ||
bfd18d1e KW |
2317 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2318 | if (ret < 0) { | |
2319 | return ret; | |
2320 | } | |
2321 | ||
2322 | if (ret == size && !blk->enable_write_cache) { | |
2323 | ret = bdrv_flush(blk_bs(blk)); | |
2324 | } | |
2325 | ||
2326 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2327 | } |
2328 | ||
2329 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2330 | { | |
0439c5a4 | 2331 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2332 | if (!blk_is_available(blk)) { |
2333 | return -ENOMEDIUM; | |
2334 | } | |
2335 | ||
f21d96d0 | 2336 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2337 | } |
f0272c4d ET |
2338 | |
2339 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2340 | { | |
0439c5a4 | 2341 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2342 | if (!blk_is_available(blk)) { |
2343 | return -ENOMEDIUM; | |
2344 | } | |
2345 | ||
f21d96d0 | 2346 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2347 | } |
2348 | ||
2349 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2350 | { | |
0439c5a4 | 2351 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2352 | if (!blk_is_available(blk)) { |
2353 | return -ENOMEDIUM; | |
2354 | } | |
2355 | ||
f21d96d0 | 2356 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2357 | } |
281d22d8 HR |
2358 | |
2359 | /* | |
2360 | * Updates the BlockBackendRootState object with data from the currently | |
2361 | * attached BlockDriverState. | |
2362 | */ | |
2363 | void blk_update_root_state(BlockBackend *blk) | |
2364 | { | |
0439c5a4 | 2365 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2366 | assert(blk->root); |
281d22d8 | 2367 | |
f21d96d0 | 2368 | blk->root_state.open_flags = blk->root->bs->open_flags; |
f21d96d0 | 2369 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; |
281d22d8 HR |
2370 | } |
2371 | ||
38cb18f5 | 2372 | /* |
b85114f8 KW |
2373 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2374 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2375 | */ |
b85114f8 | 2376 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2377 | { |
0439c5a4 | 2378 | GLOBAL_STATE_CODE(); |
b85114f8 | 2379 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2380 | } |
2381 | ||
2382 | /* | |
2383 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2384 | * supposed to inherit the root state. | |
2385 | */ | |
2386 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2387 | { | |
0439c5a4 | 2388 | GLOBAL_STATE_CODE(); |
260242a8 | 2389 | return blk->root_state.open_flags; |
38cb18f5 HR |
2390 | } |
2391 | ||
281d22d8 HR |
2392 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2393 | { | |
0439c5a4 | 2394 | GLOBAL_STATE_CODE(); |
281d22d8 HR |
2395 | return &blk->root_state; |
2396 | } | |
1393f212 HR |
2397 | |
2398 | int blk_commit_all(void) | |
2399 | { | |
fe1a9cbc | 2400 | BlockBackend *blk = NULL; |
0439c5a4 | 2401 | GLOBAL_STATE_CODE(); |
fe1a9cbc HR |
2402 | |
2403 | while ((blk = blk_all_next(blk)) != NULL) { | |
2404 | AioContext *aio_context = blk_get_aio_context(blk); | |
9a71b9de | 2405 | BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk)); |
fe1a9cbc HR |
2406 | |
2407 | aio_context_acquire(aio_context); | |
9a71b9de HR |
2408 | if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) { |
2409 | int ret; | |
2410 | ||
2411 | ret = bdrv_commit(unfiltered_bs); | |
fe1a9cbc HR |
2412 | if (ret < 0) { |
2413 | aio_context_release(aio_context); | |
2414 | return ret; | |
2415 | } | |
2416 | } | |
2417 | aio_context_release(aio_context); | |
2418 | } | |
2419 | return 0; | |
2420 | } | |
2421 | ||
97148076 KW |
2422 | |
2423 | /* throttling disk I/O limits */ | |
2424 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2425 | { | |
0439c5a4 | 2426 | GLOBAL_STATE_CODE(); |
022cdc9f | 2427 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2428 | } |
2429 | ||
2430 | void blk_io_limits_disable(BlockBackend *blk) | |
2431 | { | |
48bf7ea8 AG |
2432 | BlockDriverState *bs = blk_bs(blk); |
2433 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2434 | assert(tgm->throttle_state); | |
0439c5a4 | 2435 | GLOBAL_STATE_CODE(); |
48bf7ea8 | 2436 | if (bs) { |
1e3552db | 2437 | bdrv_ref(bs); |
48bf7ea8 AG |
2438 | bdrv_drained_begin(bs); |
2439 | } | |
2440 | throttle_group_unregister_tgm(tgm); | |
2441 | if (bs) { | |
2442 | bdrv_drained_end(bs); | |
1e3552db | 2443 | bdrv_unref(bs); |
48bf7ea8 | 2444 | } |
97148076 KW |
2445 | } |
2446 | ||
2447 | /* should be called before blk_set_io_limits if a limit is set */ | |
2448 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2449 | { | |
022cdc9f | 2450 | assert(!blk->public.throttle_group_member.throttle_state); |
0439c5a4 | 2451 | GLOBAL_STATE_CODE(); |
c61791fc MP |
2452 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2453 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2454 | } |
2455 | ||
2456 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2457 | { | |
0439c5a4 | 2458 | GLOBAL_STATE_CODE(); |
97148076 | 2459 | /* this BB is not part of any group */ |
022cdc9f | 2460 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2461 | return; |
2462 | } | |
2463 | ||
2464 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2465 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2466 | group)) { | |
97148076 KW |
2467 | return; |
2468 | } | |
2469 | ||
2470 | /* need to change the group this bs belong to */ | |
2471 | blk_io_limits_disable(blk); | |
2472 | blk_io_limits_enable(blk, group); | |
2473 | } | |
c2066af0 KW |
2474 | |
2475 | static void blk_root_drained_begin(BdrvChild *child) | |
2476 | { | |
2477 | BlockBackend *blk = child->opaque; | |
d73415a3 | 2478 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
c2066af0 | 2479 | |
f4d9cc88 JS |
2480 | if (++blk->quiesce_counter == 1) { |
2481 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
2482 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2483 | } | |
2484 | } | |
2485 | ||
36fe1331 KW |
2486 | /* Note that blk->root may not be accessible here yet if we are just |
2487 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2488 | ||
d73415a3 SH |
2489 | if (qatomic_fetch_inc(&tgm->io_limits_disabled) == 0) { |
2490 | throttle_group_restart_tgm(tgm); | |
c2066af0 KW |
2491 | } |
2492 | } | |
2493 | ||
fe5258a5 KW |
2494 | static bool blk_root_drained_poll(BdrvChild *child) |
2495 | { | |
2496 | BlockBackend *blk = child->opaque; | |
095cc4d0 | 2497 | bool busy = false; |
fe5258a5 | 2498 | assert(blk->quiesce_counter); |
095cc4d0 SL |
2499 | |
2500 | if (blk->dev_ops && blk->dev_ops->drained_poll) { | |
2501 | busy = blk->dev_ops->drained_poll(blk->dev_opaque); | |
2502 | } | |
2503 | return busy || !!blk->in_flight; | |
fe5258a5 KW |
2504 | } |
2505 | ||
e037c09c | 2506 | static void blk_root_drained_end(BdrvChild *child, int *drained_end_counter) |
c2066af0 KW |
2507 | { |
2508 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 2509 | assert(blk->quiesce_counter); |
c2066af0 | 2510 | |
022cdc9f | 2511 | assert(blk->public.throttle_group_member.io_limits_disabled); |
d73415a3 | 2512 | qatomic_dec(&blk->public.throttle_group_member.io_limits_disabled); |
f4d9cc88 JS |
2513 | |
2514 | if (--blk->quiesce_counter == 0) { | |
2515 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
2516 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2517 | } | |
cf312932 KW |
2518 | while (qemu_co_enter_next(&blk->queued_requests, NULL)) { |
2519 | /* Resume all queued requests */ | |
2520 | } | |
f4d9cc88 | 2521 | } |
c2066af0 | 2522 | } |
23d0ba93 FZ |
2523 | |
2524 | void blk_register_buf(BlockBackend *blk, void *host, size_t size) | |
2525 | { | |
0439c5a4 | 2526 | GLOBAL_STATE_CODE(); |
23d0ba93 FZ |
2527 | bdrv_register_buf(blk_bs(blk), host, size); |
2528 | } | |
2529 | ||
2530 | void blk_unregister_buf(BlockBackend *blk, void *host) | |
2531 | { | |
0439c5a4 | 2532 | GLOBAL_STATE_CODE(); |
23d0ba93 FZ |
2533 | bdrv_unregister_buf(blk_bs(blk), host); |
2534 | } | |
b5679fa4 FZ |
2535 | |
2536 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2537 | BlockBackend *blk_out, int64_t off_out, | |
e192179b | 2538 | int64_t bytes, BdrvRequestFlags read_flags, |
67b51fb9 | 2539 | BdrvRequestFlags write_flags) |
b5679fa4 FZ |
2540 | { |
2541 | int r; | |
37868b2a EGE |
2542 | IO_CODE(); |
2543 | ||
b5679fa4 FZ |
2544 | r = blk_check_byte_request(blk_in, off_in, bytes); |
2545 | if (r) { | |
2546 | return r; | |
2547 | } | |
2548 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2549 | if (r) { | |
2550 | return r; | |
2551 | } | |
2552 | return bdrv_co_copy_range(blk_in->root, off_in, | |
2553 | blk_out->root, off_out, | |
67b51fb9 | 2554 | bytes, read_flags, write_flags); |
b5679fa4 | 2555 | } |
5d3b4e99 VSO |
2556 | |
2557 | const BdrvChild *blk_root(BlockBackend *blk) | |
2558 | { | |
0439c5a4 | 2559 | GLOBAL_STATE_CODE(); |
5d3b4e99 VSO |
2560 | return blk->root; |
2561 | } | |
2b7bbdbd HR |
2562 | |
2563 | int blk_make_empty(BlockBackend *blk, Error **errp) | |
2564 | { | |
0439c5a4 | 2565 | GLOBAL_STATE_CODE(); |
2b7bbdbd HR |
2566 | if (!blk_is_available(blk)) { |
2567 | error_setg(errp, "No medium inserted"); | |
2568 | return -ENOMEDIUM; | |
2569 | } | |
2570 | ||
2571 | return bdrv_make_empty(blk->root, errp); | |
2572 | } |