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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 | ||
33949396 EGE |
137 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
138 | GHashTable *visited, Transaction *tran, | |
139 | Error **errp); | |
38475269 | 140 | |
b5411555 KW |
141 | static char *blk_root_get_parent_desc(BdrvChild *child) |
142 | { | |
143 | BlockBackend *blk = child->opaque; | |
fd240a18 | 144 | g_autofree char *dev_id = NULL; |
b5411555 KW |
145 | |
146 | if (blk->name) { | |
fd240a18 | 147 | return g_strdup_printf("block device '%s'", blk->name); |
b5411555 KW |
148 | } |
149 | ||
150 | dev_id = blk_get_attached_dev_id(blk); | |
151 | if (*dev_id) { | |
fd240a18 | 152 | return g_strdup_printf("block device '%s'", dev_id); |
b5411555 KW |
153 | } else { |
154 | /* TODO Callback into the BB owner for something more detailed */ | |
fd240a18 | 155 | return g_strdup("an unnamed block device"); |
b5411555 KW |
156 | } |
157 | } | |
158 | ||
4c265bf9 KW |
159 | static const char *blk_root_get_name(BdrvChild *child) |
160 | { | |
161 | return blk_name(child->opaque); | |
162 | } | |
163 | ||
538f0497 | 164 | static void blk_vm_state_changed(void *opaque, bool running, RunState state) |
5f7772c4 FZ |
165 | { |
166 | Error *local_err = NULL; | |
167 | BlockBackend *blk = opaque; | |
168 | ||
169 | if (state == RUN_STATE_INMIGRATE) { | |
170 | return; | |
171 | } | |
172 | ||
173 | qemu_del_vm_change_state_handler(blk->vmsh); | |
174 | blk->vmsh = NULL; | |
175 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
176 | if (local_err) { | |
177 | error_report_err(local_err); | |
178 | } | |
179 | } | |
180 | ||
4417ab7a KW |
181 | /* |
182 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
183 | * devices can tighten their permissions in response (specifically revoke | |
184 | * shared write permissions that we needed for storage migration). | |
185 | * | |
186 | * If an error is returned, the VM cannot be allowed to be resumed. | |
187 | */ | |
188 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
189 | { | |
190 | BlockBackend *blk = child->opaque; | |
191 | Error *local_err = NULL; | |
492a1196 | 192 | uint64_t saved_shared_perm; |
4417ab7a KW |
193 | |
194 | if (!blk->disable_perm) { | |
195 | return; | |
196 | } | |
197 | ||
198 | blk->disable_perm = false; | |
199 | ||
492a1196 HR |
200 | /* |
201 | * blk->shared_perm contains the permissions we want to share once | |
202 | * migration is really completely done. For now, we need to share | |
203 | * all; but we also need to retain blk->shared_perm, which is | |
204 | * overwritten by a successful blk_set_perm() call. Save it and | |
205 | * restore it below. | |
206 | */ | |
207 | saved_shared_perm = blk->shared_perm; | |
208 | ||
5f7772c4 FZ |
209 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
210 | if (local_err) { | |
211 | error_propagate(errp, local_err); | |
212 | blk->disable_perm = true; | |
213 | return; | |
214 | } | |
492a1196 | 215 | blk->shared_perm = saved_shared_perm; |
5f7772c4 FZ |
216 | |
217 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
218 | /* Activation can happen when migration process is still active, for | |
219 | * example when nbd_server_add is called during non-shared storage | |
220 | * migration. Defer the shared_perm update to migration completion. */ | |
221 | if (!blk->vmsh) { | |
222 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
223 | blk); | |
224 | } | |
225 | return; | |
226 | } | |
227 | ||
4417ab7a KW |
228 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
229 | if (local_err) { | |
230 | error_propagate(errp, local_err); | |
231 | blk->disable_perm = true; | |
232 | return; | |
233 | } | |
234 | } | |
235 | ||
ca2e2144 FZ |
236 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
237 | { | |
0439c5a4 | 238 | GLOBAL_STATE_CODE(); |
ca2e2144 FZ |
239 | blk->force_allow_inactivate = true; |
240 | } | |
241 | ||
c16de8f5 FZ |
242 | static bool blk_can_inactivate(BlockBackend *blk) |
243 | { | |
ca2e2144 | 244 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
245 | if (blk->dev || blk_name(blk)[0]) { |
246 | return true; | |
247 | } | |
248 | ||
ca2e2144 FZ |
249 | /* Inactivating means no more writes to the image can be done, |
250 | * even if those writes would be changes invisible to the | |
251 | * guest. For block job BBs that satisfy this, we can just allow | |
252 | * it. This is the case for mirror job source, which is required | |
253 | * by libvirt non-shared block migration. */ | |
254 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
255 | return true; | |
256 | } | |
257 | ||
258 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
259 | } |
260 | ||
cfa1a572 KW |
261 | static int blk_root_inactivate(BdrvChild *child) |
262 | { | |
263 | BlockBackend *blk = child->opaque; | |
264 | ||
265 | if (blk->disable_perm) { | |
266 | return 0; | |
267 | } | |
268 | ||
c16de8f5 | 269 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
270 | return -EPERM; |
271 | } | |
272 | ||
273 | blk->disable_perm = true; | |
274 | if (blk->root) { | |
275 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
276 | } | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
d03654ea SH |
281 | static void blk_root_attach(BdrvChild *child) |
282 | { | |
283 | BlockBackend *blk = child->opaque; | |
284 | BlockBackendAioNotifier *notifier; | |
285 | ||
286 | trace_blk_root_attach(child, blk, child->bs); | |
287 | ||
288 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
289 | bdrv_add_aio_context_notifier(child->bs, | |
290 | notifier->attached_aio_context, | |
291 | notifier->detach_aio_context, | |
292 | notifier->opaque); | |
293 | } | |
294 | } | |
295 | ||
296 | static void blk_root_detach(BdrvChild *child) | |
297 | { | |
298 | BlockBackend *blk = child->opaque; | |
299 | BlockBackendAioNotifier *notifier; | |
300 | ||
301 | trace_blk_root_detach(child, blk, child->bs); | |
302 | ||
303 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
304 | bdrv_remove_aio_context_notifier(child->bs, | |
305 | notifier->attached_aio_context, | |
306 | notifier->detach_aio_context, | |
307 | notifier->opaque); | |
308 | } | |
309 | } | |
310 | ||
3ca1f322 VSO |
311 | static AioContext *blk_root_get_parent_aio_context(BdrvChild *c) |
312 | { | |
313 | BlockBackend *blk = c->opaque; | |
314 | ||
315 | return blk_get_aio_context(blk); | |
316 | } | |
317 | ||
bd86fb99 | 318 | static const BdrvChildClass child_root = { |
c2066af0 KW |
319 | .inherit_options = blk_root_inherit_options, |
320 | ||
5c8cab48 KW |
321 | .change_media = blk_root_change_media, |
322 | .resize = blk_root_resize, | |
4c265bf9 | 323 | .get_name = blk_root_get_name, |
b5411555 | 324 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 325 | |
c2066af0 | 326 | .drained_begin = blk_root_drained_begin, |
fe5258a5 | 327 | .drained_poll = blk_root_drained_poll, |
c2066af0 | 328 | .drained_end = blk_root_drained_end, |
4417ab7a KW |
329 | |
330 | .activate = blk_root_activate, | |
cfa1a572 | 331 | .inactivate = blk_root_inactivate, |
d03654ea SH |
332 | |
333 | .attach = blk_root_attach, | |
334 | .detach = blk_root_detach, | |
38475269 | 335 | |
33949396 | 336 | .change_aio_ctx = blk_root_change_aio_ctx, |
3ca1f322 VSO |
337 | |
338 | .get_parent_aio_context = blk_root_get_parent_aio_context, | |
f21d96d0 KW |
339 | }; |
340 | ||
26f54e9a | 341 | /* |
efaa7c4e | 342 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
343 | * |
344 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
345 | * to request for a block driver node that is attached to this BlockBackend. | |
346 | * @shared_perm is a bitmask which describes which permissions may be granted | |
347 | * to other users of the attached node. | |
348 | * Both sets of permissions can be changed later using blk_set_perm(). | |
349 | * | |
26f54e9a MA |
350 | * Return the new BlockBackend on success, null on failure. |
351 | */ | |
d861ab3a | 352 | BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
353 | { |
354 | BlockBackend *blk; | |
355 | ||
0439c5a4 EGE |
356 | GLOBAL_STATE_CODE(); |
357 | ||
26f54e9a | 358 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 359 | blk->refcnt = 1; |
d861ab3a | 360 | blk->ctx = ctx; |
6d0eb64d KW |
361 | blk->perm = perm; |
362 | blk->shared_perm = shared_perm; | |
0c3169df KW |
363 | blk_set_enable_write_cache(blk, true); |
364 | ||
cb53460b KW |
365 | blk->on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
366 | blk->on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
367 | ||
9caa6f3d | 368 | block_acct_init(&blk->stats); |
27ccdd52 | 369 | |
cf312932 | 370 | qemu_co_queue_init(&blk->queued_requests); |
3301f6c6 HR |
371 | notifier_list_init(&blk->remove_bs_notifiers); |
372 | notifier_list_init(&blk->insert_bs_notifiers); | |
d03654ea | 373 | QLIST_INIT(&blk->aio_notifiers); |
27ccdd52 | 374 | |
2cf22d6a | 375 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
376 | return blk; |
377 | } | |
378 | ||
a3aeeab5 EB |
379 | /* |
380 | * Create a new BlockBackend connected to an existing BlockDriverState. | |
381 | * | |
382 | * @perm is a bitmasks of BLK_PERM_* constants which describes the | |
383 | * permissions to request for @bs that is attached to this | |
384 | * BlockBackend. @shared_perm is a bitmask which describes which | |
385 | * permissions may be granted to other users of the attached node. | |
386 | * Both sets of permissions can be changed later using blk_set_perm(). | |
387 | * | |
388 | * Return the new BlockBackend on success, null on failure. | |
389 | */ | |
390 | BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm, | |
391 | uint64_t shared_perm, Error **errp) | |
392 | { | |
393 | BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm); | |
394 | ||
0439c5a4 EGE |
395 | GLOBAL_STATE_CODE(); |
396 | ||
a3aeeab5 EB |
397 | if (blk_insert_bs(blk, bs, errp) < 0) { |
398 | blk_unref(blk); | |
399 | return NULL; | |
400 | } | |
401 | return blk; | |
402 | } | |
403 | ||
7e7d56d9 | 404 | /* |
28eb9b12 | 405 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
d861ab3a | 406 | * The new BlockBackend is in the main AioContext. |
ca49a4fd HR |
407 | * |
408 | * Just as with bdrv_open(), after having called this function the reference to | |
409 | * @options belongs to the block layer (even on failure). | |
410 | * | |
411 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
412 | * BDS tree just by specifying the @options QDict (or @reference, | |
413 | * alternatively). At the time of adding this function, this is not possible, | |
414 | * though, so callers of this function have to be able to specify @filename and | |
415 | * @flags. | |
416 | */ | |
efaa7c4e HR |
417 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
418 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
419 | { |
420 | BlockBackend *blk; | |
28eb9b12 | 421 | BlockDriverState *bs; |
1f4ad7d3 | 422 | uint64_t perm = 0; |
35b7f4ab | 423 | uint64_t shared = BLK_PERM_ALL; |
c62d32f5 | 424 | |
0439c5a4 EGE |
425 | GLOBAL_STATE_CODE(); |
426 | ||
35b7f4ab KW |
427 | /* |
428 | * blk_new_open() is mainly used in .bdrv_create implementations and the | |
429 | * tools where sharing isn't a major concern because the BDS stays private | |
430 | * and the file is generally not supposed to be used by a second process, | |
431 | * so we just request permission according to the flags. | |
c62d32f5 KW |
432 | * |
433 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
434 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
435 | * shouldn't hurt either. We can still share everything here because the | |
35b7f4ab KW |
436 | * guest devices will add their own blockers if they can't share. |
437 | */ | |
1f4ad7d3 KW |
438 | if ((flags & BDRV_O_NO_IO) == 0) { |
439 | perm |= BLK_PERM_CONSISTENT_READ; | |
440 | if (flags & BDRV_O_RDWR) { | |
441 | perm |= BLK_PERM_WRITE; | |
442 | } | |
c62d32f5 KW |
443 | } |
444 | if (flags & BDRV_O_RESIZE) { | |
445 | perm |= BLK_PERM_RESIZE; | |
446 | } | |
35b7f4ab KW |
447 | if (flags & BDRV_O_NO_SHARE) { |
448 | shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; | |
449 | } | |
ca49a4fd | 450 | |
35b7f4ab | 451 | blk = blk_new(qemu_get_aio_context(), perm, shared); |
5b363937 HR |
452 | bs = bdrv_open(filename, reference, options, flags, errp); |
453 | if (!bs) { | |
ca49a4fd HR |
454 | blk_unref(blk); |
455 | return NULL; | |
456 | } | |
457 | ||
1f38f04e HR |
458 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
459 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
35b7f4ab | 460 | perm, shared, blk, errp); |
50bfbe93 | 461 | if (!blk->root) { |
50bfbe93 FZ |
462 | blk_unref(blk); |
463 | return NULL; | |
464 | } | |
72e775c7 | 465 | |
ca49a4fd HR |
466 | return blk; |
467 | } | |
468 | ||
26f54e9a MA |
469 | static void blk_delete(BlockBackend *blk) |
470 | { | |
471 | assert(!blk->refcnt); | |
e5e78550 | 472 | assert(!blk->name); |
a7f53e26 | 473 | assert(!blk->dev); |
022cdc9f | 474 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
475 | blk_io_limits_disable(blk); |
476 | } | |
f21d96d0 | 477 | if (blk->root) { |
13855c6b | 478 | blk_remove_bs(blk); |
7e7d56d9 | 479 | } |
5f7772c4 FZ |
480 | if (blk->vmsh) { |
481 | qemu_del_vm_change_state_handler(blk->vmsh); | |
482 | blk->vmsh = NULL; | |
483 | } | |
3301f6c6 HR |
484 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
485 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 486 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
2cf22d6a | 487 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 488 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 489 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
490 | g_free(blk); |
491 | } | |
492 | ||
8fb3c76c MA |
493 | static void drive_info_del(DriveInfo *dinfo) |
494 | { | |
495 | if (!dinfo) { | |
496 | return; | |
497 | } | |
498 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
499 | g_free(dinfo); |
500 | } | |
501 | ||
f636ae85 AG |
502 | int blk_get_refcnt(BlockBackend *blk) |
503 | { | |
0439c5a4 | 504 | GLOBAL_STATE_CODE(); |
f636ae85 AG |
505 | return blk ? blk->refcnt : 0; |
506 | } | |
507 | ||
26f54e9a MA |
508 | /* |
509 | * Increment @blk's reference count. | |
510 | * @blk must not be null. | |
511 | */ | |
512 | void blk_ref(BlockBackend *blk) | |
513 | { | |
5ca9d21b | 514 | assert(blk->refcnt > 0); |
0439c5a4 | 515 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
516 | blk->refcnt++; |
517 | } | |
518 | ||
519 | /* | |
520 | * Decrement @blk's reference count. | |
521 | * If this drops it to zero, destroy @blk. | |
522 | * For convenience, do nothing if @blk is null. | |
523 | */ | |
524 | void blk_unref(BlockBackend *blk) | |
525 | { | |
0439c5a4 | 526 | GLOBAL_STATE_CODE(); |
26f54e9a MA |
527 | if (blk) { |
528 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
529 | if (blk->refcnt > 1) { |
530 | blk->refcnt--; | |
531 | } else { | |
532 | blk_drain(blk); | |
533 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
534 | assert(blk->refcnt == 1); | |
535 | blk->refcnt = 0; | |
26f54e9a MA |
536 | blk_delete(blk); |
537 | } | |
538 | } | |
539 | } | |
540 | ||
2cf22d6a HR |
541 | /* |
542 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
543 | * ones which are hidden (i.e. are not referenced by the monitor). | |
544 | */ | |
a429b9b5 | 545 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a | 546 | { |
0439c5a4 | 547 | GLOBAL_STATE_CODE(); |
2cf22d6a HR |
548 | return blk ? QTAILQ_NEXT(blk, link) |
549 | : QTAILQ_FIRST(&block_backends); | |
550 | } | |
551 | ||
d8da3cef HR |
552 | void blk_remove_all_bs(void) |
553 | { | |
74d1b8fc | 554 | BlockBackend *blk = NULL; |
d8da3cef | 555 | |
0439c5a4 EGE |
556 | GLOBAL_STATE_CODE(); |
557 | ||
2cf22d6a | 558 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
559 | AioContext *ctx = blk_get_aio_context(blk); |
560 | ||
561 | aio_context_acquire(ctx); | |
f21d96d0 | 562 | if (blk->root) { |
d8da3cef HR |
563 | blk_remove_bs(blk); |
564 | } | |
565 | aio_context_release(ctx); | |
566 | } | |
567 | } | |
568 | ||
26f54e9a | 569 | /* |
9492b0b9 | 570 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
571 | * If @blk is null, return the first one. |
572 | * Else, return @blk's next sibling, which may be null. | |
573 | * | |
574 | * To iterate over all BlockBackends, do | |
575 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
576 | * ... | |
577 | * } | |
578 | */ | |
579 | BlockBackend *blk_next(BlockBackend *blk) | |
580 | { | |
0439c5a4 | 581 | GLOBAL_STATE_CODE(); |
9492b0b9 HR |
582 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
583 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
584 | } |
585 | ||
7c8eece4 KW |
586 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
587 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 588 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 589 | { |
5e003f17 HR |
590 | BlockDriverState *bs, *old_bs; |
591 | ||
592 | /* Must be called from the main loop */ | |
593 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 594 | |
7c8eece4 KW |
595 | /* First, return all root nodes of BlockBackends. In order to avoid |
596 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
597 | * if the BB is the first one in the parent list of the BDS. */ | |
598 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
599 | BlockBackend *old_blk = it->blk; |
600 | ||
601 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
602 | ||
7c8eece4 KW |
603 | do { |
604 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
605 | bs = it->blk ? blk_bs(it->blk) : NULL; |
606 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 607 | |
5e003f17 HR |
608 | if (it->blk) { |
609 | blk_ref(it->blk); | |
610 | } | |
611 | blk_unref(old_blk); | |
612 | ||
88be7b4b | 613 | if (bs) { |
5e003f17 HR |
614 | bdrv_ref(bs); |
615 | bdrv_unref(old_bs); | |
88be7b4b | 616 | return bs; |
7c8eece4 KW |
617 | } |
618 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
619 | } else { |
620 | old_bs = it->bs; | |
7c8eece4 KW |
621 | } |
622 | ||
623 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
624 | * BDSes that are attached to a BlockBackend here; they have been handled | |
625 | * by the above block already */ | |
981f4f57 | 626 | do { |
7c8eece4 | 627 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
628 | bs = it->bs; |
629 | } while (bs && bdrv_has_blk(bs)); | |
630 | ||
5e003f17 HR |
631 | if (bs) { |
632 | bdrv_ref(bs); | |
633 | } | |
634 | bdrv_unref(old_bs); | |
635 | ||
88be7b4b KW |
636 | return bs; |
637 | } | |
638 | ||
5e003f17 | 639 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
640 | { |
641 | *it = (BdrvNextIterator) { | |
642 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
643 | }; | |
5e003f17 | 644 | } |
981f4f57 | 645 | |
5e003f17 HR |
646 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
647 | { | |
0439c5a4 | 648 | GLOBAL_STATE_CODE(); |
5e003f17 | 649 | bdrv_next_reset(it); |
88be7b4b | 650 | return bdrv_next(it); |
981f4f57 HR |
651 | } |
652 | ||
5e003f17 HR |
653 | /* Must be called when aborting a bdrv_next() iteration before |
654 | * bdrv_next() returns NULL */ | |
655 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
656 | { | |
657 | /* Must be called from the main loop */ | |
658 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
659 | ||
660 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
661 | if (it->blk) { | |
662 | bdrv_unref(blk_bs(it->blk)); | |
663 | blk_unref(it->blk); | |
664 | } | |
665 | } else { | |
666 | bdrv_unref(it->bs); | |
667 | } | |
668 | ||
669 | bdrv_next_reset(it); | |
670 | } | |
671 | ||
e5e78550 HR |
672 | /* |
673 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
674 | * the given @name acting as the handle for the monitor. | |
675 | * Strictly for use by blockdev.c. | |
676 | * | |
677 | * @name must not be null or empty. | |
678 | * | |
679 | * Returns true on success and false on failure. In the latter case, an Error | |
680 | * object is returned through @errp. | |
681 | */ | |
682 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
683 | { | |
684 | assert(!blk->name); | |
685 | assert(name && name[0]); | |
0439c5a4 | 686 | GLOBAL_STATE_CODE(); |
e5e78550 HR |
687 | |
688 | if (!id_wellformed(name)) { | |
689 | error_setg(errp, "Invalid device name"); | |
690 | return false; | |
691 | } | |
692 | if (blk_by_name(name)) { | |
693 | error_setg(errp, "Device with id '%s' already exists", name); | |
694 | return false; | |
695 | } | |
696 | if (bdrv_find_node(name)) { | |
697 | error_setg(errp, | |
698 | "Device name '%s' conflicts with an existing node name", | |
699 | name); | |
700 | return false; | |
701 | } | |
702 | ||
703 | blk->name = g_strdup(name); | |
704 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
705 | return true; | |
706 | } | |
707 | ||
708 | /* | |
709 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
710 | * Strictly for use by blockdev.c. | |
711 | */ | |
712 | void monitor_remove_blk(BlockBackend *blk) | |
713 | { | |
0439c5a4 EGE |
714 | GLOBAL_STATE_CODE(); |
715 | ||
e5e78550 HR |
716 | if (!blk->name) { |
717 | return; | |
718 | } | |
719 | ||
720 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
721 | g_free(blk->name); | |
722 | blk->name = NULL; | |
723 | } | |
724 | ||
26f54e9a | 725 | /* |
7e7d56d9 | 726 | * Return @blk's name, a non-null string. |
e5e78550 | 727 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 728 | */ |
0731a50f | 729 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 730 | { |
37868b2a | 731 | IO_CODE(); |
e5e78550 | 732 | return blk->name ?: ""; |
26f54e9a MA |
733 | } |
734 | ||
735 | /* | |
736 | * Return the BlockBackend with name @name if it exists, else null. | |
737 | * @name must not be null. | |
738 | */ | |
739 | BlockBackend *blk_by_name(const char *name) | |
740 | { | |
74d1b8fc | 741 | BlockBackend *blk = NULL; |
26f54e9a | 742 | |
0439c5a4 | 743 | GLOBAL_STATE_CODE(); |
26f54e9a | 744 | assert(name); |
74d1b8fc | 745 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
746 | if (!strcmp(name, blk->name)) { |
747 | return blk; | |
748 | } | |
749 | } | |
750 | return NULL; | |
751 | } | |
7e7d56d9 MA |
752 | |
753 | /* | |
754 | * Return the BlockDriverState attached to @blk if any, else null. | |
755 | */ | |
756 | BlockDriverState *blk_bs(BlockBackend *blk) | |
757 | { | |
37868b2a | 758 | IO_CODE(); |
f21d96d0 | 759 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
760 | } |
761 | ||
7c8eece4 | 762 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
763 | { |
764 | BdrvChild *child; | |
bdb73476 EGE |
765 | |
766 | GLOBAL_STATE_CODE(); | |
767 | ||
dde33812 | 768 | QLIST_FOREACH(child, &bs->parents, next_parent) { |
bd86fb99 | 769 | if (child->klass == &child_root) { |
7c8eece4 | 770 | return child->opaque; |
dde33812 KW |
771 | } |
772 | } | |
773 | ||
7c8eece4 KW |
774 | return NULL; |
775 | } | |
776 | ||
777 | /* | |
778 | * Returns true if @bs has an associated BlockBackend. | |
779 | */ | |
780 | bool bdrv_has_blk(BlockDriverState *bs) | |
781 | { | |
0439c5a4 | 782 | GLOBAL_STATE_CODE(); |
7c8eece4 | 783 | return bdrv_first_blk(bs) != NULL; |
dde33812 KW |
784 | } |
785 | ||
b6c1bae5 KW |
786 | /* |
787 | * Returns true if @bs has only BlockBackends as parents. | |
788 | */ | |
789 | bool bdrv_is_root_node(BlockDriverState *bs) | |
790 | { | |
791 | BdrvChild *c; | |
792 | ||
0439c5a4 | 793 | GLOBAL_STATE_CODE(); |
b6c1bae5 | 794 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
bd86fb99 | 795 | if (c->klass != &child_root) { |
b6c1bae5 KW |
796 | return false; |
797 | } | |
798 | } | |
799 | ||
800 | return true; | |
801 | } | |
802 | ||
18e46a03 MA |
803 | /* |
804 | * Return @blk's DriveInfo if any, else null. | |
805 | */ | |
806 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
807 | { | |
c5be7445 | 808 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
809 | return blk->legacy_dinfo; |
810 | } | |
811 | ||
812 | /* | |
813 | * Set @blk's DriveInfo to @dinfo, and return it. | |
814 | * @blk must not have a DriveInfo set already. | |
815 | * No other BlockBackend may have the same DriveInfo set. | |
816 | */ | |
817 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
818 | { | |
819 | assert(!blk->legacy_dinfo); | |
c5be7445 | 820 | GLOBAL_STATE_CODE(); |
18e46a03 MA |
821 | return blk->legacy_dinfo = dinfo; |
822 | } | |
823 | ||
824 | /* | |
825 | * Return the BlockBackend with DriveInfo @dinfo. | |
826 | * It must exist. | |
827 | */ | |
828 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
829 | { | |
74d1b8fc | 830 | BlockBackend *blk = NULL; |
c5be7445 | 831 | GLOBAL_STATE_CODE(); |
18e46a03 | 832 | |
74d1b8fc | 833 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
834 | if (blk->legacy_dinfo == dinfo) { |
835 | return blk; | |
836 | } | |
837 | } | |
838 | abort(); | |
839 | } | |
840 | ||
f2cd875d KW |
841 | /* |
842 | * Returns a pointer to the publicly accessible fields of @blk. | |
843 | */ | |
844 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
845 | { | |
0439c5a4 | 846 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
847 | return &blk->public; |
848 | } | |
849 | ||
850 | /* | |
851 | * Returns a BlockBackend given the associated @public fields. | |
852 | */ | |
853 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
854 | { | |
0439c5a4 | 855 | GLOBAL_STATE_CODE(); |
f2cd875d KW |
856 | return container_of(public, BlockBackend, public); |
857 | } | |
858 | ||
1c95f7e1 HR |
859 | /* |
860 | * Disassociates the currently associated BlockDriverState from @blk. | |
861 | */ | |
862 | void blk_remove_bs(BlockBackend *blk) | |
863 | { | |
c89bcf3a | 864 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
e6cada92 | 865 | BdrvChild *root; |
022cdc9f | 866 | |
0439c5a4 EGE |
867 | GLOBAL_STATE_CODE(); |
868 | ||
3301f6c6 | 869 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 870 | if (tgm->throttle_state) { |
1e3552db SH |
871 | BlockDriverState *bs = blk_bs(blk); |
872 | ||
873 | /* | |
874 | * Take a ref in case blk_bs() changes across bdrv_drained_begin(), for | |
875 | * example, if a temporary filter node is removed by a blockjob. | |
876 | */ | |
877 | bdrv_ref(bs); | |
632a7735 | 878 | bdrv_drained_begin(bs); |
c89bcf3a AG |
879 | throttle_group_detach_aio_context(tgm); |
880 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 881 | bdrv_drained_end(bs); |
1e3552db | 882 | bdrv_unref(bs); |
a5614993 | 883 | } |
1c95f7e1 | 884 | |
7ca7f0f6 KW |
885 | blk_update_root_state(blk); |
886 | ||
f45280cb GK |
887 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
888 | * switch to a completion coroutine later on. Let's drain all I/O here | |
889 | * to avoid that and a potential QEMU crash. | |
890 | */ | |
891 | blk_drain(blk); | |
e6cada92 | 892 | root = blk->root; |
f21d96d0 | 893 | blk->root = NULL; |
e6cada92 | 894 | bdrv_root_unref_child(root); |
1c95f7e1 HR |
895 | } |
896 | ||
0c3c36d6 HR |
897 | /* |
898 | * Associates a new BlockDriverState with @blk. | |
899 | */ | |
d7086422 | 900 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 901 | { |
c89bcf3a | 902 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
0439c5a4 | 903 | GLOBAL_STATE_CODE(); |
b441dc71 | 904 | bdrv_ref(bs); |
1f38f04e HR |
905 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
906 | BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, | |
228ca37e | 907 | blk->perm, blk->shared_perm, |
1f38f04e | 908 | blk, errp); |
d7086422 KW |
909 | if (blk->root == NULL) { |
910 | return -EPERM; | |
911 | } | |
3301f6c6 HR |
912 | |
913 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
914 | if (tgm->throttle_state) { |
915 | throttle_group_detach_aio_context(tgm); | |
916 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 917 | } |
d7086422 KW |
918 | |
919 | return 0; | |
0c3c36d6 HR |
920 | } |
921 | ||
ed089506 VSO |
922 | /* |
923 | * Change BlockDriverState associated with @blk. | |
924 | */ | |
925 | int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp) | |
926 | { | |
0439c5a4 | 927 | GLOBAL_STATE_CODE(); |
ed089506 VSO |
928 | return bdrv_replace_child_bs(blk->root, new_bs, errp); |
929 | } | |
930 | ||
981776b3 KW |
931 | /* |
932 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
933 | */ | |
934 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
935 | Error **errp) | |
936 | { | |
937 | int ret; | |
0439c5a4 | 938 | GLOBAL_STATE_CODE(); |
981776b3 | 939 | |
d35ff5e6 | 940 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
941 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
942 | if (ret < 0) { | |
943 | return ret; | |
944 | } | |
945 | } | |
946 | ||
947 | blk->perm = perm; | |
948 | blk->shared_perm = shared_perm; | |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
887354bd KW |
953 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
954 | { | |
0439c5a4 | 955 | GLOBAL_STATE_CODE(); |
887354bd KW |
956 | *perm = blk->perm; |
957 | *shared_perm = blk->shared_perm; | |
958 | } | |
959 | ||
d09ea2d2 TH |
960 | /* |
961 | * Attach device model @dev to @blk. | |
962 | * Return 0 on success, -EBUSY when a device model is attached already. | |
963 | */ | |
964 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
4be74634 | 965 | { |
0439c5a4 | 966 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
967 | if (blk->dev) { |
968 | return -EBUSY; | |
969 | } | |
d35ff5e6 KW |
970 | |
971 | /* While migration is still incoming, we don't need to apply the | |
972 | * permissions of guest device BlockBackends. We might still have a block | |
973 | * job or NBD server writing to the image for storage migration. */ | |
974 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
975 | blk->disable_perm = true; | |
976 | } | |
977 | ||
84ebe375 | 978 | blk_ref(blk); |
a7f53e26 | 979 | blk->dev = dev; |
373340b2 | 980 | blk_iostatus_reset(blk); |
d35ff5e6 | 981 | |
a7f53e26 | 982 | return 0; |
4be74634 MA |
983 | } |
984 | ||
a7f53e26 MA |
985 | /* |
986 | * Detach device model @dev from @blk. | |
987 | * @dev must be currently attached to @blk. | |
988 | */ | |
d09ea2d2 | 989 | void blk_detach_dev(BlockBackend *blk, DeviceState *dev) |
4be74634 | 990 | { |
a7f53e26 | 991 | assert(blk->dev == dev); |
0439c5a4 | 992 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
993 | blk->dev = NULL; |
994 | blk->dev_ops = NULL; | |
995 | blk->dev_opaque = NULL; | |
981776b3 | 996 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 997 | blk_unref(blk); |
4be74634 MA |
998 | } |
999 | ||
a7f53e26 MA |
1000 | /* |
1001 | * Return the device model attached to @blk if any, else null. | |
1002 | */ | |
d09ea2d2 | 1003 | DeviceState *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 | 1004 | { |
0439c5a4 | 1005 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1006 | return blk->dev; |
1007 | } | |
1008 | ||
2d76e724 KW |
1009 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
1010 | * device attached to the BlockBackend. */ | |
77beef83 | 1011 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 | 1012 | { |
d09ea2d2 | 1013 | DeviceState *dev = blk->dev; |
37868b2a | 1014 | IO_CODE(); |
2d76e724 KW |
1015 | |
1016 | if (!dev) { | |
1017 | return g_strdup(""); | |
1018 | } else if (dev->id) { | |
1019 | return g_strdup(dev->id); | |
1020 | } | |
602414d1 LM |
1021 | |
1022 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
1023 | } |
1024 | ||
1c89e1fa KW |
1025 | /* |
1026 | * Return the BlockBackend which has the device model @dev attached if it | |
1027 | * exists, else null. | |
1028 | * | |
1029 | * @dev must not be null. | |
1030 | */ | |
1031 | BlockBackend *blk_by_dev(void *dev) | |
1032 | { | |
1033 | BlockBackend *blk = NULL; | |
1034 | ||
0439c5a4 EGE |
1035 | GLOBAL_STATE_CODE(); |
1036 | ||
1c89e1fa KW |
1037 | assert(dev != NULL); |
1038 | while ((blk = blk_all_next(blk)) != NULL) { | |
1039 | if (blk->dev == dev) { | |
1040 | return blk; | |
1041 | } | |
1042 | } | |
1043 | return NULL; | |
1044 | } | |
1045 | ||
a7f53e26 MA |
1046 | /* |
1047 | * Set @blk's device model callbacks to @ops. | |
1048 | * @opaque is the opaque argument to pass to the callbacks. | |
1049 | * This is for use by device models. | |
1050 | */ | |
1051 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
1052 | void *opaque) | |
1053 | { | |
0439c5a4 | 1054 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1055 | blk->dev_ops = ops; |
1056 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
1057 | |
1058 | /* Are we currently quiesced? Should we enforce this right now? */ | |
ac1fc3a3 | 1059 | if (blk->quiesce_counter && ops && ops->drained_begin) { |
f4d9cc88 JS |
1060 | ops->drained_begin(opaque); |
1061 | } | |
a7f53e26 MA |
1062 | } |
1063 | ||
1064 | /* | |
1065 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
1066 | * |
1067 | * If @load is true, notify of media load. This action can fail, meaning that | |
1068 | * the medium cannot be loaded. @errp is set then. | |
1069 | * | |
1070 | * If @load is false, notify of media eject. This can never fail. | |
1071 | * | |
a7f53e26 MA |
1072 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
1073 | */ | |
39829a01 | 1074 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 | 1075 | { |
0439c5a4 | 1076 | GLOBAL_STATE_CODE(); |
a7f53e26 | 1077 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { |
f1f57066 | 1078 | bool tray_was_open, tray_is_open; |
39829a01 | 1079 | Error *local_err = NULL; |
a7f53e26 | 1080 | |
f1f57066 | 1081 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
1082 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
1083 | if (local_err) { | |
1084 | assert(load == true); | |
1085 | error_propagate(errp, local_err); | |
1086 | return; | |
1087 | } | |
f1f57066 HR |
1088 | tray_is_open = blk_dev_is_tray_open(blk); |
1089 | ||
1090 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 1091 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 1092 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 1093 | g_free(id); |
a7f53e26 MA |
1094 | } |
1095 | } | |
1096 | } | |
1097 | ||
5c8cab48 KW |
1098 | static void blk_root_change_media(BdrvChild *child, bool load) |
1099 | { | |
39829a01 | 1100 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
1101 | } |
1102 | ||
a7f53e26 MA |
1103 | /* |
1104 | * Does @blk's attached device model have removable media? | |
1105 | * %true if no device model is attached. | |
1106 | */ | |
1107 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
1108 | { | |
b4ad82aa | 1109 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1110 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); |
1111 | } | |
1112 | ||
8f3a73bc HR |
1113 | /* |
1114 | * Does @blk's attached device model have a tray? | |
1115 | */ | |
1116 | bool blk_dev_has_tray(BlockBackend *blk) | |
1117 | { | |
967d7905 | 1118 | IO_CODE(); |
8f3a73bc HR |
1119 | return blk->dev_ops && blk->dev_ops->is_tray_open; |
1120 | } | |
1121 | ||
a7f53e26 MA |
1122 | /* |
1123 | * Notify @blk's attached device model of a media eject request. | |
1124 | * If @force is true, the medium is about to be yanked out forcefully. | |
1125 | */ | |
1126 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1127 | { |
b4ad82aa | 1128 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1129 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1130 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1131 | } | |
4be74634 MA |
1132 | } |
1133 | ||
a7f53e26 MA |
1134 | /* |
1135 | * Does @blk's attached device model have a tray, and is it open? | |
1136 | */ | |
1137 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1138 | { |
967d7905 | 1139 | IO_CODE(); |
8f3a73bc | 1140 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1141 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1142 | } | |
1143 | return false; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * Does @blk's attached device model have the medium locked? | |
1148 | * %false if the device model has no such lock. | |
1149 | */ | |
1150 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1151 | { | |
b4ad82aa | 1152 | GLOBAL_STATE_CODE(); |
a7f53e26 MA |
1153 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { |
1154 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1155 | } | |
1156 | return false; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Notify @blk's attached device model of a backend size change. | |
1161 | */ | |
5c8cab48 | 1162 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1163 | { |
5c8cab48 KW |
1164 | BlockBackend *blk = child->opaque; |
1165 | ||
a7f53e26 MA |
1166 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1167 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | void blk_iostatus_enable(BlockBackend *blk) | |
1172 | { | |
0439c5a4 | 1173 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1174 | blk->iostatus_enabled = true; |
1175 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1176 | } | |
1177 | ||
1178 | /* The I/O status is only enabled if the drive explicitly | |
1179 | * enables it _and_ the VM is configured to stop on errors */ | |
1180 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1181 | { | |
37868b2a | 1182 | IO_CODE(); |
373340b2 HR |
1183 | return (blk->iostatus_enabled && |
1184 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1185 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1186 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1187 | } | |
1188 | ||
1189 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1190 | { | |
0439c5a4 | 1191 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1192 | return blk->iostatus; |
1193 | } | |
1194 | ||
1195 | void blk_iostatus_disable(BlockBackend *blk) | |
1196 | { | |
0439c5a4 | 1197 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1198 | blk->iostatus_enabled = false; |
1199 | } | |
1200 | ||
1201 | void blk_iostatus_reset(BlockBackend *blk) | |
1202 | { | |
0439c5a4 | 1203 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1204 | if (blk_iostatus_is_enabled(blk)) { |
1205 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
373340b2 HR |
1206 | } |
1207 | } | |
1208 | ||
1209 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1210 | { | |
37868b2a | 1211 | IO_CODE(); |
373340b2 HR |
1212 | assert(blk_iostatus_is_enabled(blk)); |
1213 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1214 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1215 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1216 | } | |
4be74634 MA |
1217 | } |
1218 | ||
c10c9d96 KW |
1219 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1220 | { | |
37868b2a | 1221 | IO_CODE(); |
c10c9d96 KW |
1222 | blk->allow_write_beyond_eof = allow; |
1223 | } | |
1224 | ||
980b0f94 KW |
1225 | void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow) |
1226 | { | |
37868b2a | 1227 | IO_CODE(); |
980b0f94 KW |
1228 | blk->allow_aio_context_change = allow; |
1229 | } | |
1230 | ||
cf312932 KW |
1231 | void blk_set_disable_request_queuing(BlockBackend *blk, bool disable) |
1232 | { | |
37868b2a | 1233 | IO_CODE(); |
cf312932 KW |
1234 | blk->disable_request_queuing = disable; |
1235 | } | |
1236 | ||
e7f7d676 | 1237 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
7242db63 | 1238 | int64_t bytes) |
e7f7d676 HR |
1239 | { |
1240 | int64_t len; | |
1241 | ||
aa78b825 | 1242 | if (bytes < 0) { |
e7f7d676 HR |
1243 | return -EIO; |
1244 | } | |
1245 | ||
c09ba36c | 1246 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
1247 | return -ENOMEDIUM; |
1248 | } | |
1249 | ||
e7f7d676 HR |
1250 | if (offset < 0) { |
1251 | return -EIO; | |
1252 | } | |
1253 | ||
c10c9d96 KW |
1254 | if (!blk->allow_write_beyond_eof) { |
1255 | len = blk_getlength(blk); | |
1256 | if (len < 0) { | |
1257 | return len; | |
1258 | } | |
1259 | ||
7242db63 | 1260 | if (offset > len || len - offset < bytes) { |
c10c9d96 KW |
1261 | return -EIO; |
1262 | } | |
e7f7d676 HR |
1263 | } |
1264 | ||
1265 | return 0; | |
1266 | } | |
1267 | ||
7f16476f | 1268 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
cf312932 KW |
1269 | static void coroutine_fn blk_wait_while_drained(BlockBackend *blk) |
1270 | { | |
7f16476f KW |
1271 | assert(blk->in_flight > 0); |
1272 | ||
cf312932 | 1273 | if (blk->quiesce_counter && !blk->disable_request_queuing) { |
7f16476f | 1274 | blk_dec_in_flight(blk); |
cf312932 | 1275 | qemu_co_queue_wait(&blk->queued_requests, NULL); |
7f16476f | 1276 | blk_inc_in_flight(blk); |
cf312932 KW |
1277 | } |
1278 | } | |
1279 | ||
fbb92b67 | 1280 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
d1d3fc3d AF |
1281 | static int coroutine_fn |
1282 | blk_co_do_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, | |
1283 | QEMUIOVector *qiov, size_t qiov_offset, | |
1284 | BdrvRequestFlags flags) | |
4be74634 | 1285 | { |
1e98fefd | 1286 | int ret; |
cf312932 | 1287 | BlockDriverState *bs; |
1581a70d | 1288 | IO_CODE(); |
1e98fefd | 1289 | |
cf312932 | 1290 | blk_wait_while_drained(blk); |
1e98fefd | 1291 | |
cf312932 KW |
1292 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1293 | bs = blk_bs(blk); | |
99723548 | 1294 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1295 | |
1296 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1297 | if (ret < 0) { |
1298 | return ret; | |
1299 | } | |
1300 | ||
99723548 PB |
1301 | bdrv_inc_in_flight(bs); |
1302 | ||
441565b2 | 1303 | /* throttling disk I/O */ |
022cdc9f MP |
1304 | if (blk->public.throttle_group_member.throttle_state) { |
1305 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1306 | bytes, false); | |
441565b2 KW |
1307 | } |
1308 | ||
d1d3fc3d AF |
1309 | ret = bdrv_co_preadv_part(blk->root, offset, bytes, qiov, qiov_offset, |
1310 | flags); | |
99723548 PB |
1311 | bdrv_dec_in_flight(bs); |
1312 | return ret; | |
1bf1cbc9 KW |
1313 | } |
1314 | ||
6f675c93 AF |
1315 | int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset, int64_t bytes, |
1316 | void *buf, BdrvRequestFlags flags) | |
1317 | { | |
1318 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1319 | IO_OR_GS_CODE(); | |
1320 | ||
1321 | assert(bytes <= SIZE_MAX); | |
1322 | ||
1323 | return blk_co_preadv(blk, offset, bytes, &qiov, flags); | |
1324 | } | |
1325 | ||
fbb92b67 | 1326 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
95479077 | 1327 | int64_t bytes, QEMUIOVector *qiov, |
fbb92b67 KW |
1328 | BdrvRequestFlags flags) |
1329 | { | |
1330 | int ret; | |
37868b2a | 1331 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1332 | |
1333 | blk_inc_in_flight(blk); | |
d1d3fc3d AF |
1334 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, 0, flags); |
1335 | blk_dec_in_flight(blk); | |
1336 | ||
1337 | return ret; | |
1338 | } | |
1339 | ||
1340 | int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset, | |
1341 | int64_t bytes, QEMUIOVector *qiov, | |
1342 | size_t qiov_offset, BdrvRequestFlags flags) | |
1343 | { | |
1344 | int ret; | |
1345 | IO_OR_GS_CODE(); | |
1346 | ||
1347 | blk_inc_in_flight(blk); | |
1348 | ret = blk_co_do_preadv_part(blk, offset, bytes, qiov, qiov_offset, flags); | |
fbb92b67 KW |
1349 | blk_dec_in_flight(blk); |
1350 | ||
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ | |
07a64aa4 | 1355 | static int coroutine_fn |
70e8775e VSO |
1356 | blk_co_do_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, |
1357 | QEMUIOVector *qiov, size_t qiov_offset, | |
1358 | BdrvRequestFlags flags) | |
a8823a3b | 1359 | { |
bfd18d1e | 1360 | int ret; |
cf312932 | 1361 | BlockDriverState *bs; |
1581a70d | 1362 | IO_CODE(); |
bfd18d1e | 1363 | |
cf312932 | 1364 | blk_wait_while_drained(blk); |
bfd18d1e | 1365 | |
cf312932 KW |
1366 | /* Call blk_bs() only after waiting, the graph may have changed */ |
1367 | bs = blk_bs(blk); | |
99723548 | 1368 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1369 | |
bfd18d1e | 1370 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1371 | if (ret < 0) { |
1372 | return ret; | |
1373 | } | |
1374 | ||
99723548 | 1375 | bdrv_inc_in_flight(bs); |
441565b2 | 1376 | /* throttling disk I/O */ |
022cdc9f MP |
1377 | if (blk->public.throttle_group_member.throttle_state) { |
1378 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1379 | bytes, true); | |
441565b2 KW |
1380 | } |
1381 | ||
bfd18d1e KW |
1382 | if (!blk->enable_write_cache) { |
1383 | flags |= BDRV_REQ_FUA; | |
1384 | } | |
1385 | ||
b3016864 VSO |
1386 | ret = bdrv_co_pwritev_part(blk->root, offset, bytes, qiov, qiov_offset, |
1387 | flags); | |
99723548 PB |
1388 | bdrv_dec_in_flight(bs); |
1389 | return ret; | |
a8823a3b KW |
1390 | } |
1391 | ||
fbb92b67 | 1392 | int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset, |
34460feb | 1393 | int64_t bytes, |
fbb92b67 KW |
1394 | QEMUIOVector *qiov, size_t qiov_offset, |
1395 | BdrvRequestFlags flags) | |
1396 | { | |
1397 | int ret; | |
37868b2a | 1398 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1399 | |
1400 | blk_inc_in_flight(blk); | |
70e8775e | 1401 | ret = blk_co_do_pwritev_part(blk, offset, bytes, qiov, qiov_offset, flags); |
fbb92b67 KW |
1402 | blk_dec_in_flight(blk); |
1403 | ||
1404 | return ret; | |
1405 | } | |
1406 | ||
6f675c93 AF |
1407 | int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes, |
1408 | const void *buf, BdrvRequestFlags flags) | |
1409 | { | |
1410 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
1411 | IO_OR_GS_CODE(); | |
1412 | ||
1413 | assert(bytes <= SIZE_MAX); | |
1414 | ||
1415 | return blk_co_pwritev(blk, offset, bytes, &qiov, flags); | |
1416 | } | |
1417 | ||
b3016864 | 1418 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
34460feb | 1419 | int64_t bytes, QEMUIOVector *qiov, |
b3016864 VSO |
1420 | BdrvRequestFlags flags) |
1421 | { | |
37868b2a | 1422 | IO_OR_GS_CODE(); |
b3016864 VSO |
1423 | return blk_co_pwritev_part(blk, offset, bytes, qiov, 0, flags); |
1424 | } | |
1425 | ||
1bf1cbc9 KW |
1426 | typedef struct BlkRwCo { |
1427 | BlockBackend *blk; | |
1428 | int64_t offset; | |
c060332c | 1429 | void *iobuf; |
1bf1cbc9 KW |
1430 | int ret; |
1431 | BdrvRequestFlags flags; | |
1432 | } BlkRwCo; | |
1433 | ||
720ff280 KW |
1434 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1435 | { | |
0439c5a4 | 1436 | GLOBAL_STATE_CODE(); |
720ff280 KW |
1437 | return bdrv_make_zero(blk->root, flags); |
1438 | } | |
1439 | ||
c90e2a9c | 1440 | void blk_inc_in_flight(BlockBackend *blk) |
33f2a757 | 1441 | { |
37868b2a | 1442 | IO_CODE(); |
d73415a3 | 1443 | qatomic_inc(&blk->in_flight); |
33f2a757 SH |
1444 | } |
1445 | ||
c90e2a9c | 1446 | void blk_dec_in_flight(BlockBackend *blk) |
33f2a757 | 1447 | { |
37868b2a | 1448 | IO_CODE(); |
d73415a3 | 1449 | qatomic_dec(&blk->in_flight); |
cfe29d82 | 1450 | aio_wait_kick(); |
33f2a757 SH |
1451 | } |
1452 | ||
e7f7d676 HR |
1453 | static void error_callback_bh(void *opaque) |
1454 | { | |
1455 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1456 | |
33f2a757 | 1457 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1458 | acb->common.cb(acb->common.opaque, acb->ret); |
1459 | qemu_aio_unref(acb); | |
1460 | } | |
1461 | ||
ca78ecfa PL |
1462 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1463 | BlockCompletionFunc *cb, | |
1464 | void *opaque, int ret) | |
e7f7d676 HR |
1465 | { |
1466 | struct BlockBackendAIOCB *acb; | |
37868b2a | 1467 | IO_CODE(); |
e7f7d676 | 1468 | |
33f2a757 | 1469 | blk_inc_in_flight(blk); |
e7f7d676 | 1470 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1471 | acb->blk = blk; |
e7f7d676 HR |
1472 | acb->ret = ret; |
1473 | ||
e4ec5ad4 PD |
1474 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1475 | error_callback_bh, acb); | |
e7f7d676 HR |
1476 | return &acb->common; |
1477 | } | |
1478 | ||
57d6a428 KW |
1479 | typedef struct BlkAioEmAIOCB { |
1480 | BlockAIOCB common; | |
1481 | BlkRwCo rwco; | |
a93d81c8 | 1482 | int64_t bytes; |
57d6a428 | 1483 | bool has_returned; |
57d6a428 KW |
1484 | } BlkAioEmAIOCB; |
1485 | ||
1d719ddc SH |
1486 | static AioContext *blk_aio_em_aiocb_get_aio_context(BlockAIOCB *acb_) |
1487 | { | |
1488 | BlkAioEmAIOCB *acb = container_of(acb_, BlkAioEmAIOCB, common); | |
1489 | ||
1490 | return blk_get_aio_context(acb->rwco.blk); | |
1491 | } | |
1492 | ||
57d6a428 KW |
1493 | static const AIOCBInfo blk_aio_em_aiocb_info = { |
1494 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1d719ddc | 1495 | .get_aio_context = blk_aio_em_aiocb_get_aio_context, |
57d6a428 KW |
1496 | }; |
1497 | ||
1498 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1499 | { | |
57d6a428 KW |
1500 | if (acb->has_returned) { |
1501 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1502 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1503 | qemu_aio_unref(acb); |
1504 | } | |
1505 | } | |
1506 | ||
1507 | static void blk_aio_complete_bh(void *opaque) | |
1508 | { | |
fffb6e12 | 1509 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1510 | assert(acb->has_returned); |
1511 | blk_aio_complete(acb); | |
57d6a428 KW |
1512 | } |
1513 | ||
a93d81c8 VSO |
1514 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, |
1515 | int64_t bytes, | |
c060332c | 1516 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1517 | BdrvRequestFlags flags, |
1518 | BlockCompletionFunc *cb, void *opaque) | |
1519 | { | |
1520 | BlkAioEmAIOCB *acb; | |
1521 | Coroutine *co; | |
1522 | ||
33f2a757 | 1523 | blk_inc_in_flight(blk); |
57d6a428 KW |
1524 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1525 | acb->rwco = (BlkRwCo) { | |
1526 | .blk = blk, | |
1527 | .offset = offset, | |
c060332c | 1528 | .iobuf = iobuf, |
57d6a428 KW |
1529 | .flags = flags, |
1530 | .ret = NOT_DONE, | |
1531 | }; | |
7fa84cd8 | 1532 | acb->bytes = bytes; |
57d6a428 KW |
1533 | acb->has_returned = false; |
1534 | ||
0b8b8753 | 1535 | co = qemu_coroutine_create(co_entry, acb); |
e92f0e19 | 1536 | bdrv_coroutine_enter(blk_bs(blk), co); |
57d6a428 KW |
1537 | |
1538 | acb->has_returned = true; | |
1539 | if (acb->rwco.ret != NOT_DONE) { | |
e4ec5ad4 PD |
1540 | replay_bh_schedule_oneshot_event(blk_get_aio_context(blk), |
1541 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1542 | } |
1543 | ||
1544 | return &acb->common; | |
1545 | } | |
1546 | ||
881a4c55 | 1547 | static void coroutine_fn blk_aio_read_entry(void *opaque) |
57d6a428 KW |
1548 | { |
1549 | BlkAioEmAIOCB *acb = opaque; | |
1550 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1551 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1552 | |
c060332c | 1553 | assert(qiov->size == acb->bytes); |
d1d3fc3d AF |
1554 | rwco->ret = blk_co_do_preadv_part(rwco->blk, rwco->offset, acb->bytes, qiov, |
1555 | 0, rwco->flags); | |
57d6a428 KW |
1556 | blk_aio_complete(acb); |
1557 | } | |
1558 | ||
881a4c55 | 1559 | static void coroutine_fn blk_aio_write_entry(void *opaque) |
57d6a428 KW |
1560 | { |
1561 | BlkAioEmAIOCB *acb = opaque; | |
1562 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1563 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1564 | |
c060332c | 1565 | assert(!qiov || qiov->size == acb->bytes); |
70e8775e VSO |
1566 | rwco->ret = blk_co_do_pwritev_part(rwco->blk, rwco->offset, acb->bytes, |
1567 | qiov, 0, rwco->flags); | |
57d6a428 KW |
1568 | blk_aio_complete(acb); |
1569 | } | |
1570 | ||
d004bd52 | 1571 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
a93d81c8 | 1572 | int64_t bytes, BdrvRequestFlags flags, |
d004bd52 | 1573 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1574 | { |
37868b2a | 1575 | IO_CODE(); |
a93d81c8 | 1576 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_write_entry, |
983a1600 | 1577 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); |
4be74634 MA |
1578 | } |
1579 | ||
4be74634 MA |
1580 | int64_t blk_getlength(BlockBackend *blk) |
1581 | { | |
37868b2a | 1582 | IO_CODE(); |
c09ba36c HR |
1583 | if (!blk_is_available(blk)) { |
1584 | return -ENOMEDIUM; | |
1585 | } | |
1586 | ||
f21d96d0 | 1587 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1588 | } |
1589 | ||
1590 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1591 | { | |
37868b2a | 1592 | IO_CODE(); |
f21d96d0 | 1593 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1594 | *nb_sectors_ptr = 0; |
1595 | } else { | |
f21d96d0 | 1596 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1597 | } |
4be74634 MA |
1598 | } |
1599 | ||
1ef01253 HR |
1600 | int64_t blk_nb_sectors(BlockBackend *blk) |
1601 | { | |
37868b2a | 1602 | IO_CODE(); |
c09ba36c HR |
1603 | if (!blk_is_available(blk)) { |
1604 | return -ENOMEDIUM; | |
1605 | } | |
1606 | ||
f21d96d0 | 1607 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1608 | } |
1609 | ||
60cb2fa7 EB |
1610 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1611 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1612 | BlockCompletionFunc *cb, void *opaque) | |
1613 | { | |
37868b2a | 1614 | IO_CODE(); |
a93d81c8 | 1615 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1616 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1617 | blk_aio_read_entry, flags, cb, opaque); | |
1618 | } | |
1619 | ||
60cb2fa7 EB |
1620 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1621 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1622 | BlockCompletionFunc *cb, void *opaque) | |
1623 | { | |
37868b2a | 1624 | IO_CODE(); |
73d4a113 | 1625 | assert((uint64_t)qiov->size <= INT64_MAX); |
60cb2fa7 EB |
1626 | return blk_aio_prwv(blk, offset, qiov->size, qiov, |
1627 | blk_aio_write_entry, flags, cb, opaque); | |
1628 | } | |
1629 | ||
4be74634 MA |
1630 | void blk_aio_cancel(BlockAIOCB *acb) |
1631 | { | |
0439c5a4 | 1632 | GLOBAL_STATE_CODE(); |
4be74634 MA |
1633 | bdrv_aio_cancel(acb); |
1634 | } | |
1635 | ||
1636 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1637 | { | |
37868b2a | 1638 | IO_CODE(); |
4be74634 MA |
1639 | bdrv_aio_cancel_async(acb); |
1640 | } | |
1641 | ||
fbb92b67 | 1642 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
df02da00 | 1643 | static int coroutine_fn |
70e8775e | 1644 | blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1645 | { |
1581a70d EGE |
1646 | IO_CODE(); |
1647 | ||
cf312932 KW |
1648 | blk_wait_while_drained(blk); |
1649 | ||
c09ba36c HR |
1650 | if (!blk_is_available(blk)) { |
1651 | return -ENOMEDIUM; | |
1652 | } | |
1653 | ||
48af776a KW |
1654 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1655 | } | |
1656 | ||
df02da00 AF |
1657 | int coroutine_fn blk_co_ioctl(BlockBackend *blk, unsigned long int req, |
1658 | void *buf) | |
48af776a | 1659 | { |
16d36e29 | 1660 | int ret; |
37868b2a | 1661 | IO_OR_GS_CODE(); |
c060332c | 1662 | |
16d36e29 | 1663 | blk_inc_in_flight(blk); |
df02da00 | 1664 | ret = blk_co_do_ioctl(blk, req, buf); |
16d36e29 | 1665 | blk_dec_in_flight(blk); |
48af776a | 1666 | |
16d36e29 | 1667 | return ret; |
48af776a KW |
1668 | } |
1669 | ||
881a4c55 | 1670 | static void coroutine_fn blk_aio_ioctl_entry(void *opaque) |
48af776a KW |
1671 | { |
1672 | BlkAioEmAIOCB *acb = opaque; | |
1673 | BlkRwCo *rwco = &acb->rwco; | |
1674 | ||
70e8775e | 1675 | rwco->ret = blk_co_do_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
c060332c | 1676 | |
48af776a | 1677 | blk_aio_complete(acb); |
4be74634 MA |
1678 | } |
1679 | ||
1680 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1681 | BlockCompletionFunc *cb, void *opaque) | |
1682 | { | |
37868b2a | 1683 | IO_CODE(); |
c060332c | 1684 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1685 | } |
1686 | ||
fbb92b67 | 1687 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1688 | static int coroutine_fn |
70e8775e | 1689 | blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes) |
2bb0dce7 | 1690 | { |
cf312932 | 1691 | int ret; |
1581a70d | 1692 | IO_CODE(); |
cf312932 KW |
1693 | |
1694 | blk_wait_while_drained(blk); | |
1695 | ||
1696 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1697 | if (ret < 0) { |
1698 | return ret; | |
1699 | } | |
1700 | ||
0b9fd3f4 | 1701 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1702 | } |
1703 | ||
881a4c55 | 1704 | static void coroutine_fn blk_aio_pdiscard_entry(void *opaque) |
564806c5 KW |
1705 | { |
1706 | BlkAioEmAIOCB *acb = opaque; | |
1707 | BlkRwCo *rwco = &acb->rwco; | |
1708 | ||
70e8775e | 1709 | rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes); |
564806c5 KW |
1710 | blk_aio_complete(acb); |
1711 | } | |
1712 | ||
1713 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, | |
a93d81c8 | 1714 | int64_t offset, int64_t bytes, |
564806c5 KW |
1715 | BlockCompletionFunc *cb, void *opaque) |
1716 | { | |
37868b2a | 1717 | IO_CODE(); |
564806c5 KW |
1718 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
1719 | cb, opaque); | |
1720 | } | |
1721 | ||
2800637a VSO |
1722 | int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset, |
1723 | int64_t bytes) | |
fbb92b67 KW |
1724 | { |
1725 | int ret; | |
37868b2a | 1726 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1727 | |
1728 | blk_inc_in_flight(blk); | |
70e8775e | 1729 | ret = blk_co_do_pdiscard(blk, offset, bytes); |
fbb92b67 KW |
1730 | blk_dec_in_flight(blk); |
1731 | ||
1732 | return ret; | |
1733 | } | |
1734 | ||
fbb92b67 | 1735 | /* To be called between exactly one pair of blk_inc/dec_in_flight() */ |
07a64aa4 | 1736 | static int coroutine_fn blk_co_do_flush(BlockBackend *blk) |
2bb0dce7 | 1737 | { |
cf312932 | 1738 | blk_wait_while_drained(blk); |
1581a70d | 1739 | IO_CODE(); |
cf312932 | 1740 | |
c09ba36c HR |
1741 | if (!blk_is_available(blk)) { |
1742 | return -ENOMEDIUM; | |
1743 | } | |
1744 | ||
f21d96d0 | 1745 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1746 | } |
1747 | ||
881a4c55 | 1748 | static void coroutine_fn blk_aio_flush_entry(void *opaque) |
564806c5 KW |
1749 | { |
1750 | BlkAioEmAIOCB *acb = opaque; | |
1751 | BlkRwCo *rwco = &acb->rwco; | |
1752 | ||
70e8775e | 1753 | rwco->ret = blk_co_do_flush(rwco->blk); |
564806c5 KW |
1754 | blk_aio_complete(acb); |
1755 | } | |
1756 | ||
1757 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, | |
1758 | BlockCompletionFunc *cb, void *opaque) | |
1759 | { | |
37868b2a | 1760 | IO_CODE(); |
564806c5 KW |
1761 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
1762 | } | |
1763 | ||
fbb92b67 KW |
1764 | int coroutine_fn blk_co_flush(BlockBackend *blk) |
1765 | { | |
1766 | int ret; | |
37868b2a | 1767 | IO_OR_GS_CODE(); |
fbb92b67 KW |
1768 | |
1769 | blk_inc_in_flight(blk); | |
70e8775e | 1770 | ret = blk_co_do_flush(blk); |
fbb92b67 KW |
1771 | blk_dec_in_flight(blk); |
1772 | ||
1773 | return ret; | |
1774 | } | |
1775 | ||
97b0385a AY |
1776 | void blk_drain(BlockBackend *blk) |
1777 | { | |
33f2a757 | 1778 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1779 | GLOBAL_STATE_CODE(); |
33f2a757 SH |
1780 | |
1781 | if (bs) { | |
1e3552db | 1782 | bdrv_ref(bs); |
33f2a757 SH |
1783 | bdrv_drained_begin(bs); |
1784 | } | |
1785 | ||
1786 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 1787 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
d73415a3 | 1788 | qatomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1789 | |
1790 | if (bs) { | |
1791 | bdrv_drained_end(bs); | |
1e3552db | 1792 | bdrv_unref(bs); |
a46fc9c9 | 1793 | } |
97b0385a AY |
1794 | } |
1795 | ||
4be74634 MA |
1796 | void blk_drain_all(void) |
1797 | { | |
33f2a757 SH |
1798 | BlockBackend *blk = NULL; |
1799 | ||
0439c5a4 EGE |
1800 | GLOBAL_STATE_CODE(); |
1801 | ||
33f2a757 SH |
1802 | bdrv_drain_all_begin(); |
1803 | ||
1804 | while ((blk = blk_all_next(blk)) != NULL) { | |
1805 | AioContext *ctx = blk_get_aio_context(blk); | |
1806 | ||
1807 | aio_context_acquire(ctx); | |
1808 | ||
1809 | /* We may have -ENOMEDIUM completions in flight */ | |
d73415a3 | 1810 | AIO_WAIT_WHILE(ctx, qatomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1811 | |
1812 | aio_context_release(ctx); | |
1813 | } | |
1814 | ||
1815 | bdrv_drain_all_end(); | |
4be74634 MA |
1816 | } |
1817 | ||
373340b2 HR |
1818 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1819 | BlockdevOnError on_write_error) | |
1820 | { | |
0439c5a4 | 1821 | GLOBAL_STATE_CODE(); |
373340b2 HR |
1822 | blk->on_read_error = on_read_error; |
1823 | blk->on_write_error = on_write_error; | |
1824 | } | |
1825 | ||
4be74634 MA |
1826 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1827 | { | |
37868b2a | 1828 | IO_CODE(); |
373340b2 | 1829 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1830 | } |
1831 | ||
1832 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1833 | int error) | |
1834 | { | |
373340b2 | 1835 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
37868b2a | 1836 | IO_CODE(); |
373340b2 HR |
1837 | |
1838 | switch (on_err) { | |
1839 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1840 | return (error == ENOSPC) ? | |
1841 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1842 | case BLOCKDEV_ON_ERROR_STOP: | |
1843 | return BLOCK_ERROR_ACTION_STOP; | |
1844 | case BLOCKDEV_ON_ERROR_REPORT: | |
1845 | return BLOCK_ERROR_ACTION_REPORT; | |
1846 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1847 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1848 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1849 | default: |
1850 | abort(); | |
1851 | } | |
4be74634 MA |
1852 | } |
1853 | ||
373340b2 HR |
1854 | static void send_qmp_error_event(BlockBackend *blk, |
1855 | BlockErrorAction action, | |
1856 | bool is_read, int error) | |
1857 | { | |
1858 | IoOperationType optype; | |
bfe1a14c | 1859 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
1860 | |
1861 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
bfe1a14c KW |
1862 | qapi_event_send_block_io_error(blk_name(blk), !!bs, |
1863 | bs ? bdrv_get_node_name(bs) : NULL, optype, | |
2bf7e10f | 1864 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 1865 | error == ENOSPC, strerror(error)); |
373340b2 HR |
1866 | } |
1867 | ||
1868 | /* This is done by device models because, while the block layer knows | |
1869 | * about the error, it does not know whether an operation comes from | |
1870 | * the device or the block layer (from a job, for example). | |
1871 | */ | |
4be74634 MA |
1872 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1873 | bool is_read, int error) | |
1874 | { | |
373340b2 | 1875 | assert(error >= 0); |
37868b2a | 1876 | IO_CODE(); |
373340b2 HR |
1877 | |
1878 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1879 | /* First set the iostatus, so that "info block" returns an iostatus | |
1880 | * that matches the events raised so far (an additional error iostatus | |
1881 | * is fine, but not a lost one). | |
1882 | */ | |
1883 | blk_iostatus_set_err(blk, error); | |
1884 | ||
1885 | /* Then raise the request to stop the VM and the event. | |
1886 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1887 | * it ensures that the STOP event always comes after the | |
1888 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1889 | * can observe the STOP event and do a "cont" before the STOP | |
1890 | * event is issued, the VM will not stop. In this case, vm_start() | |
1891 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1892 | */ | |
1893 | qemu_system_vmstop_request_prepare(); | |
1894 | send_qmp_error_event(blk, action, is_read, error); | |
1895 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1896 | } else { | |
1897 | send_qmp_error_event(blk, action, is_read, error); | |
1898 | } | |
4be74634 MA |
1899 | } |
1900 | ||
86b1cf32 KW |
1901 | /* |
1902 | * Returns true if the BlockBackend can support taking write permissions | |
1903 | * (because its root node is not read-only). | |
1904 | */ | |
1905 | bool blk_supports_write_perm(BlockBackend *blk) | |
4be74634 | 1906 | { |
f21d96d0 | 1907 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1908 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1909 | |
1910 | if (bs) { | |
86b1cf32 | 1911 | return !bdrv_is_read_only(bs); |
061959e8 | 1912 | } else { |
260242a8 | 1913 | return blk->root_state.open_flags & BDRV_O_RDWR; |
061959e8 | 1914 | } |
4be74634 MA |
1915 | } |
1916 | ||
86b1cf32 KW |
1917 | /* |
1918 | * Returns true if the BlockBackend can be written to in its current | |
1919 | * configuration (i.e. if write permission have been requested) | |
1920 | */ | |
1921 | bool blk_is_writable(BlockBackend *blk) | |
1922 | { | |
37868b2a | 1923 | IO_CODE(); |
86b1cf32 KW |
1924 | return blk->perm & BLK_PERM_WRITE; |
1925 | } | |
1926 | ||
96710565 | 1927 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 1928 | { |
f21d96d0 | 1929 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1930 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1931 | |
1932 | if (!bs) { | |
96710565 | 1933 | return false; |
a46fc9c9 HR |
1934 | } |
1935 | ||
f21d96d0 | 1936 | return bdrv_is_sg(bs); |
4be74634 MA |
1937 | } |
1938 | ||
96710565 | 1939 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 1940 | { |
37868b2a | 1941 | IO_CODE(); |
bfd18d1e | 1942 | return blk->enable_write_cache; |
4be74634 MA |
1943 | } |
1944 | ||
1945 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1946 | { | |
be8da05b | 1947 | IO_CODE(); |
bfd18d1e | 1948 | blk->enable_write_cache = wce; |
4be74634 MA |
1949 | } |
1950 | ||
3b717194 | 1951 | void blk_activate(BlockBackend *blk, Error **errp) |
2bb0dce7 | 1952 | { |
f21d96d0 | 1953 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 1954 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
1955 | |
1956 | if (!bs) { | |
c09ba36c HR |
1957 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1958 | return; | |
1959 | } | |
1960 | ||
a94750d9 | 1961 | bdrv_activate(bs, errp); |
2bb0dce7 HR |
1962 | } |
1963 | ||
e031f750 | 1964 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1965 | { |
f21d96d0 | 1966 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 1967 | IO_CODE(); |
f21d96d0 KW |
1968 | |
1969 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1970 | } |
1971 | ||
1972 | bool blk_is_available(BlockBackend *blk) | |
1973 | { | |
37868b2a | 1974 | IO_CODE(); |
db0284f8 | 1975 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); |
4be74634 MA |
1976 | } |
1977 | ||
1978 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1979 | { | |
f21d96d0 | 1980 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 1981 | IO_CODE(); |
f21d96d0 KW |
1982 | |
1983 | if (bs) { | |
1984 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1985 | } |
4be74634 MA |
1986 | } |
1987 | ||
1988 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1989 | { | |
f21d96d0 | 1990 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 | 1991 | char *id; |
37868b2a | 1992 | IO_CODE(); |
2d76e724 | 1993 | |
f21d96d0 KW |
1994 | if (bs) { |
1995 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1996 | } |
c47ee043 JS |
1997 | |
1998 | /* Whether or not we ejected on the backend, | |
1999 | * the frontend experienced a tray event. */ | |
2000 | id = blk_get_attached_dev_id(blk); | |
2001 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 2002 | eject_flag); |
c47ee043 | 2003 | g_free(id); |
4be74634 MA |
2004 | } |
2005 | ||
2006 | int blk_get_flags(BlockBackend *blk) | |
2007 | { | |
f21d96d0 | 2008 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2009 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2010 | |
2011 | if (bs) { | |
2012 | return bdrv_get_flags(bs); | |
061959e8 HR |
2013 | } else { |
2014 | return blk->root_state.open_flags; | |
2015 | } | |
4be74634 MA |
2016 | } |
2017 | ||
4841211e EB |
2018 | /* Returns the minimum request alignment, in bytes; guaranteed nonzero */ |
2019 | uint32_t blk_get_request_alignment(BlockBackend *blk) | |
2020 | { | |
2021 | BlockDriverState *bs = blk_bs(blk); | |
37868b2a | 2022 | IO_CODE(); |
4841211e EB |
2023 | return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE; |
2024 | } | |
2025 | ||
24b36e98 PB |
2026 | /* Returns the maximum hardware transfer length, in bytes; guaranteed nonzero */ |
2027 | uint64_t blk_get_max_hw_transfer(BlockBackend *blk) | |
2028 | { | |
2029 | BlockDriverState *bs = blk_bs(blk); | |
2030 | uint64_t max = INT_MAX; | |
37868b2a | 2031 | IO_CODE(); |
24b36e98 PB |
2032 | |
2033 | if (bs) { | |
2034 | max = MIN_NON_ZERO(max, bs->bl.max_hw_transfer); | |
2035 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); | |
2036 | } | |
2037 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); | |
2038 | } | |
2039 | ||
5def6b80 EB |
2040 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
2041 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 2042 | { |
f21d96d0 | 2043 | BlockDriverState *bs = blk_bs(blk); |
b99f7fa0 | 2044 | uint32_t max = INT_MAX; |
37868b2a | 2045 | IO_CODE(); |
f21d96d0 KW |
2046 | |
2047 | if (bs) { | |
b99f7fa0 | 2048 | max = MIN_NON_ZERO(max, bs->bl.max_transfer); |
a46fc9c9 | 2049 | } |
b99f7fa0 | 2050 | return ROUND_DOWN(max, blk_get_request_alignment(blk)); |
454057b7 PL |
2051 | } |
2052 | ||
cc071629 PB |
2053 | int blk_get_max_hw_iov(BlockBackend *blk) |
2054 | { | |
37868b2a | 2055 | IO_CODE(); |
cc071629 PB |
2056 | return MIN_NON_ZERO(blk->root->bs->bl.max_hw_iov, |
2057 | blk->root->bs->bl.max_iov); | |
2058 | } | |
2059 | ||
648296e0 SH |
2060 | int blk_get_max_iov(BlockBackend *blk) |
2061 | { | |
37868b2a | 2062 | IO_CODE(); |
f21d96d0 | 2063 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
2064 | } |
2065 | ||
f1c17521 PB |
2066 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
2067 | { | |
37868b2a | 2068 | IO_CODE(); |
f21d96d0 | 2069 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
2070 | } |
2071 | ||
4be74634 MA |
2072 | void *blk_blockalign(BlockBackend *blk, size_t size) |
2073 | { | |
37868b2a | 2074 | IO_CODE(); |
f21d96d0 | 2075 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
2076 | } |
2077 | ||
2078 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
2079 | { | |
f21d96d0 | 2080 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2081 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2082 | |
2083 | if (!bs) { | |
a46fc9c9 HR |
2084 | return false; |
2085 | } | |
2086 | ||
f21d96d0 | 2087 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
2088 | } |
2089 | ||
2090 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
2091 | { | |
f21d96d0 | 2092 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2093 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2094 | |
2095 | if (bs) { | |
2096 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 2097 | } |
4be74634 MA |
2098 | } |
2099 | ||
2100 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
2101 | { | |
f21d96d0 | 2102 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2103 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2104 | |
2105 | if (bs) { | |
2106 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 2107 | } |
4be74634 MA |
2108 | } |
2109 | ||
2110 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
2111 | { | |
f21d96d0 | 2112 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2113 | GLOBAL_STATE_CODE(); |
f21d96d0 KW |
2114 | |
2115 | if (bs) { | |
2116 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 2117 | } |
4be74634 MA |
2118 | } |
2119 | ||
2120 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
2121 | { | |
d861ab3a | 2122 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2123 | IO_CODE(); |
d861ab3a | 2124 | |
d861ab3a | 2125 | if (bs) { |
132ada80 KW |
2126 | AioContext *ctx = bdrv_get_aio_context(blk_bs(blk)); |
2127 | assert(ctx == blk->ctx); | |
d861ab3a KW |
2128 | } |
2129 | ||
2130 | return blk->ctx; | |
4981bdec HR |
2131 | } |
2132 | ||
2133 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
2134 | { | |
2135 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
2136 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
2137 | } |
2138 | ||
97896a48 KW |
2139 | static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2140 | bool update_root_node, Error **errp) | |
4be74634 | 2141 | { |
f21d96d0 | 2142 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 2143 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
97896a48 | 2144 | int ret; |
f21d96d0 KW |
2145 | |
2146 | if (bs) { | |
1e3552db SH |
2147 | bdrv_ref(bs); |
2148 | ||
97896a48 | 2149 | if (update_root_node) { |
f8be48ad EGE |
2150 | /* |
2151 | * update_root_node MUST be false for blk_root_set_aio_ctx_commit(), | |
2152 | * as we are already in the commit function of a transaction. | |
2153 | */ | |
a41cfda1 | 2154 | ret = bdrv_try_change_aio_context(bs, new_context, blk->root, errp); |
97896a48 | 2155 | if (ret < 0) { |
1e3552db | 2156 | bdrv_unref(bs); |
97896a48 KW |
2157 | return ret; |
2158 | } | |
2159 | } | |
c61791fc | 2160 | if (tgm->throttle_state) { |
dc868fb0 | 2161 | bdrv_drained_begin(bs); |
c61791fc MP |
2162 | throttle_group_detach_aio_context(tgm); |
2163 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 2164 | bdrv_drained_end(bs); |
7ca7f0f6 | 2165 | } |
1e3552db SH |
2166 | |
2167 | bdrv_unref(bs); | |
a46fc9c9 | 2168 | } |
97896a48 | 2169 | |
d861ab3a | 2170 | blk->ctx = new_context; |
97896a48 | 2171 | return 0; |
4be74634 MA |
2172 | } |
2173 | ||
97896a48 KW |
2174 | int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, |
2175 | Error **errp) | |
38475269 | 2176 | { |
0439c5a4 | 2177 | GLOBAL_STATE_CODE(); |
97896a48 | 2178 | return blk_do_set_aio_context(blk, new_context, true, errp); |
38475269 KW |
2179 | } |
2180 | ||
33949396 EGE |
2181 | typedef struct BdrvStateBlkRootContext { |
2182 | AioContext *new_ctx; | |
2183 | BlockBackend *blk; | |
2184 | } BdrvStateBlkRootContext; | |
2185 | ||
2186 | static void blk_root_set_aio_ctx_commit(void *opaque) | |
2187 | { | |
2188 | BdrvStateBlkRootContext *s = opaque; | |
2189 | BlockBackend *blk = s->blk; | |
2190 | ||
2191 | blk_do_set_aio_context(blk, s->new_ctx, false, &error_abort); | |
2192 | } | |
2193 | ||
2194 | static TransactionActionDrv set_blk_root_context = { | |
2195 | .commit = blk_root_set_aio_ctx_commit, | |
2196 | .clean = g_free, | |
2197 | }; | |
2198 | ||
2199 | static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, | |
2200 | GHashTable *visited, Transaction *tran, | |
2201 | Error **errp) | |
38475269 KW |
2202 | { |
2203 | BlockBackend *blk = child->opaque; | |
33949396 | 2204 | BdrvStateBlkRootContext *s; |
38475269 | 2205 | |
33949396 EGE |
2206 | if (!blk->allow_aio_context_change) { |
2207 | /* | |
2208 | * Manually created BlockBackends (those with a name) that are not | |
2209 | * attached to anything can change their AioContext without updating | |
2210 | * their user; return an error for others. | |
2211 | */ | |
2212 | if (!blk->name || blk->dev) { | |
2213 | /* TODO Add BB name/QOM path */ | |
2214 | error_setg(errp, "Cannot change iothread of active block backend"); | |
2215 | return false; | |
2216 | } | |
980b0f94 KW |
2217 | } |
2218 | ||
33949396 EGE |
2219 | s = g_new(BdrvStateBlkRootContext, 1); |
2220 | *s = (BdrvStateBlkRootContext) { | |
2221 | .new_ctx = ctx, | |
2222 | .blk = blk, | |
2223 | }; | |
38475269 | 2224 | |
33949396 | 2225 | tran_add(tran, &set_blk_root_context, s); |
38475269 KW |
2226 | return true; |
2227 | } | |
2228 | ||
2019ba0a HR |
2229 | void blk_add_aio_context_notifier(BlockBackend *blk, |
2230 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
2231 | void (*detach_aio_context)(void *opaque), void *opaque) | |
2232 | { | |
d03654ea | 2233 | BlockBackendAioNotifier *notifier; |
f21d96d0 | 2234 | BlockDriverState *bs = blk_bs(blk); |
0439c5a4 | 2235 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2236 | |
d03654ea SH |
2237 | notifier = g_new(BlockBackendAioNotifier, 1); |
2238 | notifier->attached_aio_context = attached_aio_context; | |
2239 | notifier->detach_aio_context = detach_aio_context; | |
2240 | notifier->opaque = opaque; | |
2241 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
2242 | ||
f21d96d0 KW |
2243 | if (bs) { |
2244 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2245 | detach_aio_context, opaque); |
2246 | } | |
2019ba0a HR |
2247 | } |
2248 | ||
2249 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
2250 | void (*attached_aio_context)(AioContext *, | |
2251 | void *), | |
2252 | void (*detach_aio_context)(void *), | |
2253 | void *opaque) | |
2254 | { | |
d03654ea | 2255 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
2256 | BlockDriverState *bs = blk_bs(blk); |
2257 | ||
0439c5a4 EGE |
2258 | GLOBAL_STATE_CODE(); |
2259 | ||
f21d96d0 KW |
2260 | if (bs) { |
2261 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
2262 | detach_aio_context, opaque); |
2263 | } | |
d03654ea SH |
2264 | |
2265 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
2266 | if (notifier->attached_aio_context == attached_aio_context && | |
2267 | notifier->detach_aio_context == detach_aio_context && | |
2268 | notifier->opaque == opaque) { | |
2269 | QLIST_REMOVE(notifier, list); | |
2270 | g_free(notifier); | |
2271 | return; | |
2272 | } | |
2273 | } | |
2274 | ||
2275 | abort(); | |
2019ba0a HR |
2276 | } |
2277 | ||
3301f6c6 HR |
2278 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
2279 | { | |
0439c5a4 | 2280 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2281 | notifier_list_add(&blk->remove_bs_notifiers, notify); |
2282 | } | |
2283 | ||
2284 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
2285 | { | |
0439c5a4 | 2286 | GLOBAL_STATE_CODE(); |
3301f6c6 HR |
2287 | notifier_list_add(&blk->insert_bs_notifiers, notify); |
2288 | } | |
2289 | ||
4be74634 MA |
2290 | void blk_io_plug(BlockBackend *blk) |
2291 | { | |
f21d96d0 | 2292 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2293 | IO_CODE(); |
f21d96d0 KW |
2294 | |
2295 | if (bs) { | |
2296 | bdrv_io_plug(bs); | |
a46fc9c9 | 2297 | } |
4be74634 MA |
2298 | } |
2299 | ||
2300 | void blk_io_unplug(BlockBackend *blk) | |
2301 | { | |
f21d96d0 | 2302 | BlockDriverState *bs = blk_bs(blk); |
37868b2a | 2303 | IO_CODE(); |
f21d96d0 KW |
2304 | |
2305 | if (bs) { | |
2306 | bdrv_io_unplug(bs); | |
a46fc9c9 | 2307 | } |
4be74634 MA |
2308 | } |
2309 | ||
2310 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
2311 | { | |
37868b2a | 2312 | IO_CODE(); |
7f0e9da6 | 2313 | return &blk->stats; |
4be74634 MA |
2314 | } |
2315 | ||
2316 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
2317 | BlockCompletionFunc *cb, void *opaque) | |
2318 | { | |
37868b2a | 2319 | IO_CODE(); |
4be74634 MA |
2320 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); |
2321 | } | |
1ef01253 | 2322 | |
d004bd52 | 2323 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
34460feb | 2324 | int64_t bytes, BdrvRequestFlags flags) |
1ef01253 | 2325 | { |
37868b2a | 2326 | IO_OR_GS_CODE(); |
f5a5ca79 | 2327 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 2328 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
2329 | } |
2330 | ||
2c9715fa AF |
2331 | int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset, |
2332 | int64_t bytes, const void *buf) | |
1ef01253 | 2333 | { |
06f0325c | 2334 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |
37868b2a | 2335 | IO_OR_GS_CODE(); |
2c9715fa AF |
2336 | return blk_co_pwritev_part(blk, offset, bytes, &qiov, 0, |
2337 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2338 | } |
2339 | ||
015ed252 AF |
2340 | int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact, |
2341 | PreallocMode prealloc, BdrvRequestFlags flags, | |
2342 | Error **errp) | |
1ef01253 | 2343 | { |
37868b2a | 2344 | IO_OR_GS_CODE(); |
c09ba36c | 2345 | if (!blk_is_available(blk)) { |
ed3d2ec9 | 2346 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2347 | return -ENOMEDIUM; |
2348 | } | |
2349 | ||
015ed252 | 2350 | return bdrv_co_truncate(blk->root, offset, exact, prealloc, flags, errp); |
1ef01253 HR |
2351 | } |
2352 | ||
1ef01253 HR |
2353 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, |
2354 | int64_t pos, int size) | |
2355 | { | |
bfd18d1e | 2356 | int ret; |
0439c5a4 | 2357 | GLOBAL_STATE_CODE(); |
bfd18d1e | 2358 | |
c09ba36c HR |
2359 | if (!blk_is_available(blk)) { |
2360 | return -ENOMEDIUM; | |
2361 | } | |
2362 | ||
bfd18d1e KW |
2363 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2364 | if (ret < 0) { | |
2365 | return ret; | |
2366 | } | |
2367 | ||
2368 | if (ret == size && !blk->enable_write_cache) { | |
2369 | ret = bdrv_flush(blk_bs(blk)); | |
2370 | } | |
2371 | ||
2372 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2373 | } |
2374 | ||
2375 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2376 | { | |
0439c5a4 | 2377 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2378 | if (!blk_is_available(blk)) { |
2379 | return -ENOMEDIUM; | |
2380 | } | |
2381 | ||
f21d96d0 | 2382 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2383 | } |
f0272c4d ET |
2384 | |
2385 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2386 | { | |
0439c5a4 | 2387 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2388 | if (!blk_is_available(blk)) { |
2389 | return -ENOMEDIUM; | |
2390 | } | |
2391 | ||
f21d96d0 | 2392 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2393 | } |
2394 | ||
2395 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2396 | { | |
0439c5a4 | 2397 | GLOBAL_STATE_CODE(); |
c09ba36c HR |
2398 | if (!blk_is_available(blk)) { |
2399 | return -ENOMEDIUM; | |
2400 | } | |
2401 | ||
f21d96d0 | 2402 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2403 | } |
281d22d8 HR |
2404 | |
2405 | /* | |
2406 | * Updates the BlockBackendRootState object with data from the currently | |
2407 | * attached BlockDriverState. | |
2408 | */ | |
2409 | void blk_update_root_state(BlockBackend *blk) | |
2410 | { | |
0439c5a4 | 2411 | GLOBAL_STATE_CODE(); |
f21d96d0 | 2412 | assert(blk->root); |
281d22d8 | 2413 | |
f21d96d0 | 2414 | blk->root_state.open_flags = blk->root->bs->open_flags; |
f21d96d0 | 2415 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; |
281d22d8 HR |
2416 | } |
2417 | ||
38cb18f5 | 2418 | /* |
b85114f8 KW |
2419 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2420 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2421 | */ |
b85114f8 | 2422 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2423 | { |
0439c5a4 | 2424 | GLOBAL_STATE_CODE(); |
b85114f8 | 2425 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2426 | } |
2427 | ||
2428 | /* | |
2429 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2430 | * supposed to inherit the root state. | |
2431 | */ | |
2432 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2433 | { | |
0439c5a4 | 2434 | GLOBAL_STATE_CODE(); |
260242a8 | 2435 | return blk->root_state.open_flags; |
38cb18f5 HR |
2436 | } |
2437 | ||
281d22d8 HR |
2438 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2439 | { | |
0439c5a4 | 2440 | GLOBAL_STATE_CODE(); |
281d22d8 HR |
2441 | return &blk->root_state; |
2442 | } | |
1393f212 HR |
2443 | |
2444 | int blk_commit_all(void) | |
2445 | { | |
fe1a9cbc | 2446 | BlockBackend *blk = NULL; |
0439c5a4 | 2447 | GLOBAL_STATE_CODE(); |
fe1a9cbc HR |
2448 | |
2449 | while ((blk = blk_all_next(blk)) != NULL) { | |
2450 | AioContext *aio_context = blk_get_aio_context(blk); | |
9a71b9de | 2451 | BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk)); |
fe1a9cbc HR |
2452 | |
2453 | aio_context_acquire(aio_context); | |
9a71b9de HR |
2454 | if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) { |
2455 | int ret; | |
2456 | ||
2457 | ret = bdrv_commit(unfiltered_bs); | |
fe1a9cbc HR |
2458 | if (ret < 0) { |
2459 | aio_context_release(aio_context); | |
2460 | return ret; | |
2461 | } | |
2462 | } | |
2463 | aio_context_release(aio_context); | |
2464 | } | |
2465 | return 0; | |
2466 | } | |
2467 | ||
97148076 KW |
2468 | |
2469 | /* throttling disk I/O limits */ | |
2470 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2471 | { | |
0439c5a4 | 2472 | GLOBAL_STATE_CODE(); |
022cdc9f | 2473 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2474 | } |
2475 | ||
2476 | void blk_io_limits_disable(BlockBackend *blk) | |
2477 | { | |
48bf7ea8 AG |
2478 | BlockDriverState *bs = blk_bs(blk); |
2479 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2480 | assert(tgm->throttle_state); | |
0439c5a4 | 2481 | GLOBAL_STATE_CODE(); |
48bf7ea8 | 2482 | if (bs) { |
1e3552db | 2483 | bdrv_ref(bs); |
48bf7ea8 AG |
2484 | bdrv_drained_begin(bs); |
2485 | } | |
2486 | throttle_group_unregister_tgm(tgm); | |
2487 | if (bs) { | |
2488 | bdrv_drained_end(bs); | |
1e3552db | 2489 | bdrv_unref(bs); |
48bf7ea8 | 2490 | } |
97148076 KW |
2491 | } |
2492 | ||
2493 | /* should be called before blk_set_io_limits if a limit is set */ | |
2494 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2495 | { | |
022cdc9f | 2496 | assert(!blk->public.throttle_group_member.throttle_state); |
0439c5a4 | 2497 | GLOBAL_STATE_CODE(); |
c61791fc MP |
2498 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2499 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2500 | } |
2501 | ||
2502 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2503 | { | |
0439c5a4 | 2504 | GLOBAL_STATE_CODE(); |
97148076 | 2505 | /* this BB is not part of any group */ |
022cdc9f | 2506 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2507 | return; |
2508 | } | |
2509 | ||
2510 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2511 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2512 | group)) { | |
97148076 KW |
2513 | return; |
2514 | } | |
2515 | ||
2516 | /* need to change the group this bs belong to */ | |
2517 | blk_io_limits_disable(blk); | |
2518 | blk_io_limits_enable(blk, group); | |
2519 | } | |
c2066af0 KW |
2520 | |
2521 | static void blk_root_drained_begin(BdrvChild *child) | |
2522 | { | |
2523 | BlockBackend *blk = child->opaque; | |
d73415a3 | 2524 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
c2066af0 | 2525 | |
f4d9cc88 JS |
2526 | if (++blk->quiesce_counter == 1) { |
2527 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
2528 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2529 | } | |
2530 | } | |
2531 | ||
36fe1331 KW |
2532 | /* Note that blk->root may not be accessible here yet if we are just |
2533 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2534 | ||
d73415a3 SH |
2535 | if (qatomic_fetch_inc(&tgm->io_limits_disabled) == 0) { |
2536 | throttle_group_restart_tgm(tgm); | |
c2066af0 KW |
2537 | } |
2538 | } | |
2539 | ||
fe5258a5 KW |
2540 | static bool blk_root_drained_poll(BdrvChild *child) |
2541 | { | |
2542 | BlockBackend *blk = child->opaque; | |
095cc4d0 | 2543 | bool busy = false; |
fe5258a5 | 2544 | assert(blk->quiesce_counter); |
095cc4d0 SL |
2545 | |
2546 | if (blk->dev_ops && blk->dev_ops->drained_poll) { | |
2547 | busy = blk->dev_ops->drained_poll(blk->dev_opaque); | |
2548 | } | |
2549 | return busy || !!blk->in_flight; | |
fe5258a5 KW |
2550 | } |
2551 | ||
e037c09c | 2552 | static void blk_root_drained_end(BdrvChild *child, int *drained_end_counter) |
c2066af0 KW |
2553 | { |
2554 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 2555 | assert(blk->quiesce_counter); |
c2066af0 | 2556 | |
022cdc9f | 2557 | assert(blk->public.throttle_group_member.io_limits_disabled); |
d73415a3 | 2558 | qatomic_dec(&blk->public.throttle_group_member.io_limits_disabled); |
f4d9cc88 JS |
2559 | |
2560 | if (--blk->quiesce_counter == 0) { | |
2561 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
2562 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2563 | } | |
cf312932 KW |
2564 | while (qemu_co_enter_next(&blk->queued_requests, NULL)) { |
2565 | /* Resume all queued requests */ | |
2566 | } | |
f4d9cc88 | 2567 | } |
c2066af0 | 2568 | } |
23d0ba93 | 2569 | |
f4ec04ba | 2570 | bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp) |
23d0ba93 | 2571 | { |
0439c5a4 | 2572 | GLOBAL_STATE_CODE(); |
f4ec04ba | 2573 | return bdrv_register_buf(blk_bs(blk), host, size, errp); |
23d0ba93 FZ |
2574 | } |
2575 | ||
4f384011 | 2576 | void blk_unregister_buf(BlockBackend *blk, void *host, size_t size) |
23d0ba93 | 2577 | { |
0439c5a4 | 2578 | GLOBAL_STATE_CODE(); |
4f384011 | 2579 | bdrv_unregister_buf(blk_bs(blk), host, size); |
23d0ba93 | 2580 | } |
b5679fa4 FZ |
2581 | |
2582 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2583 | BlockBackend *blk_out, int64_t off_out, | |
e192179b | 2584 | int64_t bytes, BdrvRequestFlags read_flags, |
67b51fb9 | 2585 | BdrvRequestFlags write_flags) |
b5679fa4 FZ |
2586 | { |
2587 | int r; | |
37868b2a EGE |
2588 | IO_CODE(); |
2589 | ||
b5679fa4 FZ |
2590 | r = blk_check_byte_request(blk_in, off_in, bytes); |
2591 | if (r) { | |
2592 | return r; | |
2593 | } | |
2594 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2595 | if (r) { | |
2596 | return r; | |
2597 | } | |
2598 | return bdrv_co_copy_range(blk_in->root, off_in, | |
2599 | blk_out->root, off_out, | |
67b51fb9 | 2600 | bytes, read_flags, write_flags); |
b5679fa4 | 2601 | } |
5d3b4e99 VSO |
2602 | |
2603 | const BdrvChild *blk_root(BlockBackend *blk) | |
2604 | { | |
0439c5a4 | 2605 | GLOBAL_STATE_CODE(); |
5d3b4e99 VSO |
2606 | return blk->root; |
2607 | } | |
2b7bbdbd HR |
2608 | |
2609 | int blk_make_empty(BlockBackend *blk, Error **errp) | |
2610 | { | |
0439c5a4 | 2611 | GLOBAL_STATE_CODE(); |
2b7bbdbd HR |
2612 | if (!blk_is_available(blk)) { |
2613 | error_setg(errp, "No medium inserted"); | |
2614 | return -ENOMEDIUM; | |
2615 | } | |
2616 | ||
2617 | return bdrv_make_empty(blk->root, errp); | |
2618 | } |