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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" |
281d22d8 | 17 | #include "block/throttle-groups.h" |
18e46a03 | 18 | #include "sysemu/blockdev.h" |
373340b2 | 19 | #include "sysemu/sysemu.h" |
e688df6b | 20 | #include "qapi/error.h" |
9af23989 | 21 | #include "qapi/qapi-events-block.h" |
f348b6d1 | 22 | #include "qemu/id.h" |
922a01a0 | 23 | #include "qemu/option.h" |
1e98fefd | 24 | #include "trace.h" |
5f7772c4 | 25 | #include "migration/misc.h" |
a7f53e26 MA |
26 | |
27 | /* Number of coroutines to reserve per attached device model */ | |
28 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 29 | |
1bf1cbc9 KW |
30 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
31 | ||
4981bdec HR |
32 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
33 | ||
d03654ea SH |
34 | typedef struct BlockBackendAioNotifier { |
35 | void (*attached_aio_context)(AioContext *new_context, void *opaque); | |
36 | void (*detach_aio_context)(void *opaque); | |
37 | void *opaque; | |
38 | QLIST_ENTRY(BlockBackendAioNotifier) list; | |
39 | } BlockBackendAioNotifier; | |
40 | ||
26f54e9a MA |
41 | struct BlockBackend { |
42 | char *name; | |
43 | int refcnt; | |
f21d96d0 | 44 | BdrvChild *root; |
d861ab3a | 45 | AioContext *ctx; |
26f8b3a8 | 46 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 47 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 48 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 49 | BlockBackendPublic public; |
a7f53e26 | 50 | |
d09ea2d2 | 51 | DeviceState *dev; /* attached device model, if any */ |
a7f53e26 MA |
52 | const BlockDevOps *dev_ops; |
53 | void *dev_opaque; | |
68e9ec01 HR |
54 | |
55 | /* the block size for which the guest device expects atomicity */ | |
56 | int guest_block_size; | |
7f0e9da6 | 57 | |
281d22d8 HR |
58 | /* If the BDS tree is removed, some of its options are stored here (which |
59 | * can be used to restore those options in the new BDS on insert) */ | |
60 | BlockBackendRootState root_state; | |
61 | ||
bfd18d1e KW |
62 | bool enable_write_cache; |
63 | ||
7f0e9da6 HR |
64 | /* I/O stats (display with "info blockstats"). */ |
65 | BlockAcctStats stats; | |
373340b2 HR |
66 | |
67 | BlockdevOnError on_read_error, on_write_error; | |
68 | bool iostatus_enabled; | |
69 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 70 | |
981776b3 KW |
71 | uint64_t perm; |
72 | uint64_t shared_perm; | |
d35ff5e6 | 73 | bool disable_perm; |
981776b3 | 74 | |
980b0f94 | 75 | bool allow_aio_context_change; |
c10c9d96 KW |
76 | bool allow_write_beyond_eof; |
77 | ||
3301f6c6 | 78 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
d03654ea | 79 | QLIST_HEAD(, BlockBackendAioNotifier) aio_notifiers; |
f4d9cc88 JS |
80 | |
81 | int quiesce_counter; | |
5f7772c4 | 82 | VMChangeStateEntry *vmsh; |
ca2e2144 | 83 | bool force_allow_inactivate; |
33f2a757 SH |
84 | |
85 | /* Number of in-flight aio requests. BlockDriverState also counts | |
86 | * in-flight requests but aio requests can exist even when blk->root is | |
87 | * NULL, so we cannot rely on its counter for that case. | |
88 | * Accessed with atomic ops. | |
89 | */ | |
90 | unsigned int in_flight; | |
26f54e9a MA |
91 | }; |
92 | ||
e7f7d676 HR |
93 | typedef struct BlockBackendAIOCB { |
94 | BlockAIOCB common; | |
4981bdec | 95 | BlockBackend *blk; |
e7f7d676 HR |
96 | int ret; |
97 | } BlockBackendAIOCB; | |
98 | ||
99 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 100 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
101 | .aiocb_size = sizeof(BlockBackendAIOCB), |
102 | }; | |
103 | ||
8fb3c76c | 104 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 105 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
8fb3c76c | 106 | |
2cf22d6a HR |
107 | /* All BlockBackends */ |
108 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
109 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
110 | ||
9492b0b9 HR |
111 | /* All BlockBackends referenced by the monitor and which are iterated through by |
112 | * blk_next() */ | |
113 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
114 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 115 | |
f21d96d0 KW |
116 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
117 | int parent_flags, QDict *parent_options) | |
118 | { | |
119 | /* We're not supposed to call this function for root nodes */ | |
120 | abort(); | |
121 | } | |
c2066af0 | 122 | static void blk_root_drained_begin(BdrvChild *child); |
fe5258a5 | 123 | static bool blk_root_drained_poll(BdrvChild *child); |
c2066af0 | 124 | static void blk_root_drained_end(BdrvChild *child); |
f21d96d0 | 125 | |
5c8cab48 KW |
126 | static void blk_root_change_media(BdrvChild *child, bool load); |
127 | static void blk_root_resize(BdrvChild *child); | |
128 | ||
38475269 KW |
129 | static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx, |
130 | GSList **ignore, Error **errp); | |
131 | static void blk_root_set_aio_ctx(BdrvChild *child, AioContext *ctx, | |
132 | GSList **ignore); | |
133 | ||
b5411555 KW |
134 | static char *blk_root_get_parent_desc(BdrvChild *child) |
135 | { | |
136 | BlockBackend *blk = child->opaque; | |
137 | char *dev_id; | |
138 | ||
139 | if (blk->name) { | |
140 | return g_strdup(blk->name); | |
141 | } | |
142 | ||
143 | dev_id = blk_get_attached_dev_id(blk); | |
144 | if (*dev_id) { | |
145 | return dev_id; | |
146 | } else { | |
147 | /* TODO Callback into the BB owner for something more detailed */ | |
148 | g_free(dev_id); | |
149 | return g_strdup("a block device"); | |
150 | } | |
151 | } | |
152 | ||
4c265bf9 KW |
153 | static const char *blk_root_get_name(BdrvChild *child) |
154 | { | |
155 | return blk_name(child->opaque); | |
156 | } | |
157 | ||
5f7772c4 FZ |
158 | static void blk_vm_state_changed(void *opaque, int running, RunState state) |
159 | { | |
160 | Error *local_err = NULL; | |
161 | BlockBackend *blk = opaque; | |
162 | ||
163 | if (state == RUN_STATE_INMIGRATE) { | |
164 | return; | |
165 | } | |
166 | ||
167 | qemu_del_vm_change_state_handler(blk->vmsh); | |
168 | blk->vmsh = NULL; | |
169 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
170 | if (local_err) { | |
171 | error_report_err(local_err); | |
172 | } | |
173 | } | |
174 | ||
4417ab7a KW |
175 | /* |
176 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
177 | * devices can tighten their permissions in response (specifically revoke | |
178 | * shared write permissions that we needed for storage migration). | |
179 | * | |
180 | * If an error is returned, the VM cannot be allowed to be resumed. | |
181 | */ | |
182 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
183 | { | |
184 | BlockBackend *blk = child->opaque; | |
185 | Error *local_err = NULL; | |
186 | ||
187 | if (!blk->disable_perm) { | |
188 | return; | |
189 | } | |
190 | ||
191 | blk->disable_perm = false; | |
192 | ||
5f7772c4 FZ |
193 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
194 | if (local_err) { | |
195 | error_propagate(errp, local_err); | |
196 | blk->disable_perm = true; | |
197 | return; | |
198 | } | |
199 | ||
200 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
201 | /* Activation can happen when migration process is still active, for | |
202 | * example when nbd_server_add is called during non-shared storage | |
203 | * migration. Defer the shared_perm update to migration completion. */ | |
204 | if (!blk->vmsh) { | |
205 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
206 | blk); | |
207 | } | |
208 | return; | |
209 | } | |
210 | ||
4417ab7a KW |
211 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
212 | if (local_err) { | |
213 | error_propagate(errp, local_err); | |
214 | blk->disable_perm = true; | |
215 | return; | |
216 | } | |
217 | } | |
218 | ||
ca2e2144 FZ |
219 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
220 | { | |
221 | blk->force_allow_inactivate = true; | |
222 | } | |
223 | ||
c16de8f5 FZ |
224 | static bool blk_can_inactivate(BlockBackend *blk) |
225 | { | |
ca2e2144 | 226 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
227 | if (blk->dev || blk_name(blk)[0]) { |
228 | return true; | |
229 | } | |
230 | ||
ca2e2144 FZ |
231 | /* Inactivating means no more writes to the image can be done, |
232 | * even if those writes would be changes invisible to the | |
233 | * guest. For block job BBs that satisfy this, we can just allow | |
234 | * it. This is the case for mirror job source, which is required | |
235 | * by libvirt non-shared block migration. */ | |
236 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
237 | return true; | |
238 | } | |
239 | ||
240 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
241 | } |
242 | ||
cfa1a572 KW |
243 | static int blk_root_inactivate(BdrvChild *child) |
244 | { | |
245 | BlockBackend *blk = child->opaque; | |
246 | ||
247 | if (blk->disable_perm) { | |
248 | return 0; | |
249 | } | |
250 | ||
c16de8f5 | 251 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
252 | return -EPERM; |
253 | } | |
254 | ||
255 | blk->disable_perm = true; | |
256 | if (blk->root) { | |
257 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
d03654ea SH |
263 | static void blk_root_attach(BdrvChild *child) |
264 | { | |
265 | BlockBackend *blk = child->opaque; | |
266 | BlockBackendAioNotifier *notifier; | |
267 | ||
268 | trace_blk_root_attach(child, blk, child->bs); | |
269 | ||
270 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
271 | bdrv_add_aio_context_notifier(child->bs, | |
272 | notifier->attached_aio_context, | |
273 | notifier->detach_aio_context, | |
274 | notifier->opaque); | |
275 | } | |
276 | } | |
277 | ||
278 | static void blk_root_detach(BdrvChild *child) | |
279 | { | |
280 | BlockBackend *blk = child->opaque; | |
281 | BlockBackendAioNotifier *notifier; | |
282 | ||
283 | trace_blk_root_detach(child, blk, child->bs); | |
284 | ||
285 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
286 | bdrv_remove_aio_context_notifier(child->bs, | |
287 | notifier->attached_aio_context, | |
288 | notifier->detach_aio_context, | |
289 | notifier->opaque); | |
290 | } | |
291 | } | |
292 | ||
f21d96d0 | 293 | static const BdrvChildRole child_root = { |
c2066af0 KW |
294 | .inherit_options = blk_root_inherit_options, |
295 | ||
5c8cab48 KW |
296 | .change_media = blk_root_change_media, |
297 | .resize = blk_root_resize, | |
4c265bf9 | 298 | .get_name = blk_root_get_name, |
b5411555 | 299 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 300 | |
c2066af0 | 301 | .drained_begin = blk_root_drained_begin, |
fe5258a5 | 302 | .drained_poll = blk_root_drained_poll, |
c2066af0 | 303 | .drained_end = blk_root_drained_end, |
4417ab7a KW |
304 | |
305 | .activate = blk_root_activate, | |
cfa1a572 | 306 | .inactivate = blk_root_inactivate, |
d03654ea SH |
307 | |
308 | .attach = blk_root_attach, | |
309 | .detach = blk_root_detach, | |
38475269 KW |
310 | |
311 | .can_set_aio_ctx = blk_root_can_set_aio_ctx, | |
312 | .set_aio_ctx = blk_root_set_aio_ctx, | |
f21d96d0 KW |
313 | }; |
314 | ||
26f54e9a | 315 | /* |
efaa7c4e | 316 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
317 | * |
318 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
319 | * to request for a block driver node that is attached to this BlockBackend. | |
320 | * @shared_perm is a bitmask which describes which permissions may be granted | |
321 | * to other users of the attached node. | |
322 | * Both sets of permissions can be changed later using blk_set_perm(). | |
323 | * | |
26f54e9a MA |
324 | * Return the new BlockBackend on success, null on failure. |
325 | */ | |
d861ab3a | 326 | BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
327 | { |
328 | BlockBackend *blk; | |
329 | ||
26f54e9a | 330 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 331 | blk->refcnt = 1; |
d861ab3a | 332 | blk->ctx = ctx; |
6d0eb64d KW |
333 | blk->perm = perm; |
334 | blk->shared_perm = shared_perm; | |
0c3169df KW |
335 | blk_set_enable_write_cache(blk, true); |
336 | ||
cb53460b KW |
337 | blk->on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
338 | blk->on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
339 | ||
9caa6f3d | 340 | block_acct_init(&blk->stats); |
27ccdd52 | 341 | |
3301f6c6 HR |
342 | notifier_list_init(&blk->remove_bs_notifiers); |
343 | notifier_list_init(&blk->insert_bs_notifiers); | |
d03654ea | 344 | QLIST_INIT(&blk->aio_notifiers); |
27ccdd52 | 345 | |
2cf22d6a | 346 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
347 | return blk; |
348 | } | |
349 | ||
7e7d56d9 | 350 | /* |
28eb9b12 | 351 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
d861ab3a | 352 | * The new BlockBackend is in the main AioContext. |
ca49a4fd HR |
353 | * |
354 | * Just as with bdrv_open(), after having called this function the reference to | |
355 | * @options belongs to the block layer (even on failure). | |
356 | * | |
357 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
358 | * BDS tree just by specifying the @options QDict (or @reference, | |
359 | * alternatively). At the time of adding this function, this is not possible, | |
360 | * though, so callers of this function have to be able to specify @filename and | |
361 | * @flags. | |
362 | */ | |
efaa7c4e HR |
363 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
364 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
365 | { |
366 | BlockBackend *blk; | |
28eb9b12 | 367 | BlockDriverState *bs; |
1f4ad7d3 | 368 | uint64_t perm = 0; |
c62d32f5 KW |
369 | |
370 | /* blk_new_open() is mainly used in .bdrv_create implementations and the | |
371 | * tools where sharing isn't a concern because the BDS stays private, so we | |
372 | * just request permission according to the flags. | |
373 | * | |
374 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
375 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
376 | * shouldn't hurt either. We can still share everything here because the | |
377 | * guest devices will add their own blockers if they can't share. */ | |
1f4ad7d3 KW |
378 | if ((flags & BDRV_O_NO_IO) == 0) { |
379 | perm |= BLK_PERM_CONSISTENT_READ; | |
380 | if (flags & BDRV_O_RDWR) { | |
381 | perm |= BLK_PERM_WRITE; | |
382 | } | |
c62d32f5 KW |
383 | } |
384 | if (flags & BDRV_O_RESIZE) { | |
385 | perm |= BLK_PERM_RESIZE; | |
386 | } | |
ca49a4fd | 387 | |
d861ab3a | 388 | blk = blk_new(qemu_get_aio_context(), perm, BLK_PERM_ALL); |
5b363937 HR |
389 | bs = bdrv_open(filename, reference, options, flags, errp); |
390 | if (!bs) { | |
ca49a4fd HR |
391 | blk_unref(blk); |
392 | return NULL; | |
393 | } | |
394 | ||
132ada80 | 395 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, blk->ctx, |
50bfbe93 FZ |
396 | perm, BLK_PERM_ALL, blk, errp); |
397 | if (!blk->root) { | |
50bfbe93 FZ |
398 | blk_unref(blk); |
399 | return NULL; | |
400 | } | |
72e775c7 | 401 | |
ca49a4fd HR |
402 | return blk; |
403 | } | |
404 | ||
26f54e9a MA |
405 | static void blk_delete(BlockBackend *blk) |
406 | { | |
407 | assert(!blk->refcnt); | |
e5e78550 | 408 | assert(!blk->name); |
a7f53e26 | 409 | assert(!blk->dev); |
022cdc9f | 410 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
411 | blk_io_limits_disable(blk); |
412 | } | |
f21d96d0 | 413 | if (blk->root) { |
13855c6b | 414 | blk_remove_bs(blk); |
7e7d56d9 | 415 | } |
5f7772c4 FZ |
416 | if (blk->vmsh) { |
417 | qemu_del_vm_change_state_handler(blk->vmsh); | |
418 | blk->vmsh = NULL; | |
419 | } | |
3301f6c6 HR |
420 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
421 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 422 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
2cf22d6a | 423 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 424 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 425 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
426 | g_free(blk); |
427 | } | |
428 | ||
8fb3c76c MA |
429 | static void drive_info_del(DriveInfo *dinfo) |
430 | { | |
431 | if (!dinfo) { | |
432 | return; | |
433 | } | |
434 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
435 | g_free(dinfo); |
436 | } | |
437 | ||
f636ae85 AG |
438 | int blk_get_refcnt(BlockBackend *blk) |
439 | { | |
440 | return blk ? blk->refcnt : 0; | |
441 | } | |
442 | ||
26f54e9a MA |
443 | /* |
444 | * Increment @blk's reference count. | |
445 | * @blk must not be null. | |
446 | */ | |
447 | void blk_ref(BlockBackend *blk) | |
448 | { | |
5ca9d21b | 449 | assert(blk->refcnt > 0); |
26f54e9a MA |
450 | blk->refcnt++; |
451 | } | |
452 | ||
453 | /* | |
454 | * Decrement @blk's reference count. | |
455 | * If this drops it to zero, destroy @blk. | |
456 | * For convenience, do nothing if @blk is null. | |
457 | */ | |
458 | void blk_unref(BlockBackend *blk) | |
459 | { | |
460 | if (blk) { | |
461 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
462 | if (blk->refcnt > 1) { |
463 | blk->refcnt--; | |
464 | } else { | |
465 | blk_drain(blk); | |
466 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
467 | assert(blk->refcnt == 1); | |
468 | blk->refcnt = 0; | |
26f54e9a MA |
469 | blk_delete(blk); |
470 | } | |
471 | } | |
472 | } | |
473 | ||
2cf22d6a HR |
474 | /* |
475 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
476 | * ones which are hidden (i.e. are not referenced by the monitor). | |
477 | */ | |
a429b9b5 | 478 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a HR |
479 | { |
480 | return blk ? QTAILQ_NEXT(blk, link) | |
481 | : QTAILQ_FIRST(&block_backends); | |
482 | } | |
483 | ||
d8da3cef HR |
484 | void blk_remove_all_bs(void) |
485 | { | |
74d1b8fc | 486 | BlockBackend *blk = NULL; |
d8da3cef | 487 | |
2cf22d6a | 488 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
489 | AioContext *ctx = blk_get_aio_context(blk); |
490 | ||
491 | aio_context_acquire(ctx); | |
f21d96d0 | 492 | if (blk->root) { |
d8da3cef HR |
493 | blk_remove_bs(blk); |
494 | } | |
495 | aio_context_release(ctx); | |
496 | } | |
497 | } | |
498 | ||
26f54e9a | 499 | /* |
9492b0b9 | 500 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
501 | * If @blk is null, return the first one. |
502 | * Else, return @blk's next sibling, which may be null. | |
503 | * | |
504 | * To iterate over all BlockBackends, do | |
505 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
506 | * ... | |
507 | * } | |
508 | */ | |
509 | BlockBackend *blk_next(BlockBackend *blk) | |
510 | { | |
9492b0b9 HR |
511 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
512 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
513 | } |
514 | ||
7c8eece4 KW |
515 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
516 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 517 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 518 | { |
5e003f17 HR |
519 | BlockDriverState *bs, *old_bs; |
520 | ||
521 | /* Must be called from the main loop */ | |
522 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 523 | |
7c8eece4 KW |
524 | /* First, return all root nodes of BlockBackends. In order to avoid |
525 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
526 | * if the BB is the first one in the parent list of the BDS. */ | |
527 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
528 | BlockBackend *old_blk = it->blk; |
529 | ||
530 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
531 | ||
7c8eece4 KW |
532 | do { |
533 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
534 | bs = it->blk ? blk_bs(it->blk) : NULL; |
535 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 536 | |
5e003f17 HR |
537 | if (it->blk) { |
538 | blk_ref(it->blk); | |
539 | } | |
540 | blk_unref(old_blk); | |
541 | ||
88be7b4b | 542 | if (bs) { |
5e003f17 HR |
543 | bdrv_ref(bs); |
544 | bdrv_unref(old_bs); | |
88be7b4b | 545 | return bs; |
7c8eece4 KW |
546 | } |
547 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
548 | } else { |
549 | old_bs = it->bs; | |
7c8eece4 KW |
550 | } |
551 | ||
552 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
553 | * BDSes that are attached to a BlockBackend here; they have been handled | |
554 | * by the above block already */ | |
981f4f57 | 555 | do { |
7c8eece4 | 556 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
557 | bs = it->bs; |
558 | } while (bs && bdrv_has_blk(bs)); | |
559 | ||
5e003f17 HR |
560 | if (bs) { |
561 | bdrv_ref(bs); | |
562 | } | |
563 | bdrv_unref(old_bs); | |
564 | ||
88be7b4b KW |
565 | return bs; |
566 | } | |
567 | ||
5e003f17 | 568 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
569 | { |
570 | *it = (BdrvNextIterator) { | |
571 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
572 | }; | |
5e003f17 | 573 | } |
981f4f57 | 574 | |
5e003f17 HR |
575 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
576 | { | |
577 | bdrv_next_reset(it); | |
88be7b4b | 578 | return bdrv_next(it); |
981f4f57 HR |
579 | } |
580 | ||
5e003f17 HR |
581 | /* Must be called when aborting a bdrv_next() iteration before |
582 | * bdrv_next() returns NULL */ | |
583 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
584 | { | |
585 | /* Must be called from the main loop */ | |
586 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
587 | ||
588 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
589 | if (it->blk) { | |
590 | bdrv_unref(blk_bs(it->blk)); | |
591 | blk_unref(it->blk); | |
592 | } | |
593 | } else { | |
594 | bdrv_unref(it->bs); | |
595 | } | |
596 | ||
597 | bdrv_next_reset(it); | |
598 | } | |
599 | ||
e5e78550 HR |
600 | /* |
601 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
602 | * the given @name acting as the handle for the monitor. | |
603 | * Strictly for use by blockdev.c. | |
604 | * | |
605 | * @name must not be null or empty. | |
606 | * | |
607 | * Returns true on success and false on failure. In the latter case, an Error | |
608 | * object is returned through @errp. | |
609 | */ | |
610 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
611 | { | |
612 | assert(!blk->name); | |
613 | assert(name && name[0]); | |
614 | ||
615 | if (!id_wellformed(name)) { | |
616 | error_setg(errp, "Invalid device name"); | |
617 | return false; | |
618 | } | |
619 | if (blk_by_name(name)) { | |
620 | error_setg(errp, "Device with id '%s' already exists", name); | |
621 | return false; | |
622 | } | |
623 | if (bdrv_find_node(name)) { | |
624 | error_setg(errp, | |
625 | "Device name '%s' conflicts with an existing node name", | |
626 | name); | |
627 | return false; | |
628 | } | |
629 | ||
630 | blk->name = g_strdup(name); | |
631 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
632 | return true; | |
633 | } | |
634 | ||
635 | /* | |
636 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
637 | * Strictly for use by blockdev.c. | |
638 | */ | |
639 | void monitor_remove_blk(BlockBackend *blk) | |
640 | { | |
641 | if (!blk->name) { | |
642 | return; | |
643 | } | |
644 | ||
645 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
646 | g_free(blk->name); | |
647 | blk->name = NULL; | |
648 | } | |
649 | ||
26f54e9a | 650 | /* |
7e7d56d9 | 651 | * Return @blk's name, a non-null string. |
e5e78550 | 652 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 653 | */ |
0731a50f | 654 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 655 | { |
e5e78550 | 656 | return blk->name ?: ""; |
26f54e9a MA |
657 | } |
658 | ||
659 | /* | |
660 | * Return the BlockBackend with name @name if it exists, else null. | |
661 | * @name must not be null. | |
662 | */ | |
663 | BlockBackend *blk_by_name(const char *name) | |
664 | { | |
74d1b8fc | 665 | BlockBackend *blk = NULL; |
26f54e9a MA |
666 | |
667 | assert(name); | |
74d1b8fc | 668 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
669 | if (!strcmp(name, blk->name)) { |
670 | return blk; | |
671 | } | |
672 | } | |
673 | return NULL; | |
674 | } | |
7e7d56d9 MA |
675 | |
676 | /* | |
677 | * Return the BlockDriverState attached to @blk if any, else null. | |
678 | */ | |
679 | BlockDriverState *blk_bs(BlockBackend *blk) | |
680 | { | |
f21d96d0 | 681 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
682 | } |
683 | ||
7c8eece4 | 684 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
685 | { |
686 | BdrvChild *child; | |
687 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
688 | if (child->role == &child_root) { | |
7c8eece4 | 689 | return child->opaque; |
dde33812 KW |
690 | } |
691 | } | |
692 | ||
7c8eece4 KW |
693 | return NULL; |
694 | } | |
695 | ||
696 | /* | |
697 | * Returns true if @bs has an associated BlockBackend. | |
698 | */ | |
699 | bool bdrv_has_blk(BlockDriverState *bs) | |
700 | { | |
701 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
702 | } |
703 | ||
b6c1bae5 KW |
704 | /* |
705 | * Returns true if @bs has only BlockBackends as parents. | |
706 | */ | |
707 | bool bdrv_is_root_node(BlockDriverState *bs) | |
708 | { | |
709 | BdrvChild *c; | |
710 | ||
711 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
712 | if (c->role != &child_root) { | |
713 | return false; | |
714 | } | |
715 | } | |
716 | ||
717 | return true; | |
718 | } | |
719 | ||
18e46a03 MA |
720 | /* |
721 | * Return @blk's DriveInfo if any, else null. | |
722 | */ | |
723 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
724 | { | |
725 | return blk->legacy_dinfo; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Set @blk's DriveInfo to @dinfo, and return it. | |
730 | * @blk must not have a DriveInfo set already. | |
731 | * No other BlockBackend may have the same DriveInfo set. | |
732 | */ | |
733 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
734 | { | |
735 | assert(!blk->legacy_dinfo); | |
736 | return blk->legacy_dinfo = dinfo; | |
737 | } | |
738 | ||
739 | /* | |
740 | * Return the BlockBackend with DriveInfo @dinfo. | |
741 | * It must exist. | |
742 | */ | |
743 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
744 | { | |
74d1b8fc | 745 | BlockBackend *blk = NULL; |
18e46a03 | 746 | |
74d1b8fc | 747 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
748 | if (blk->legacy_dinfo == dinfo) { |
749 | return blk; | |
750 | } | |
751 | } | |
752 | abort(); | |
753 | } | |
754 | ||
f2cd875d KW |
755 | /* |
756 | * Returns a pointer to the publicly accessible fields of @blk. | |
757 | */ | |
758 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
759 | { | |
760 | return &blk->public; | |
761 | } | |
762 | ||
763 | /* | |
764 | * Returns a BlockBackend given the associated @public fields. | |
765 | */ | |
766 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
767 | { | |
768 | return container_of(public, BlockBackend, public); | |
769 | } | |
770 | ||
1c95f7e1 HR |
771 | /* |
772 | * Disassociates the currently associated BlockDriverState from @blk. | |
773 | */ | |
774 | void blk_remove_bs(BlockBackend *blk) | |
775 | { | |
c89bcf3a | 776 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
632a7735 | 777 | BlockDriverState *bs; |
022cdc9f | 778 | |
3301f6c6 | 779 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 780 | if (tgm->throttle_state) { |
632a7735 ZL |
781 | bs = blk_bs(blk); |
782 | bdrv_drained_begin(bs); | |
c89bcf3a AG |
783 | throttle_group_detach_aio_context(tgm); |
784 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 785 | bdrv_drained_end(bs); |
a5614993 | 786 | } |
1c95f7e1 | 787 | |
7ca7f0f6 KW |
788 | blk_update_root_state(blk); |
789 | ||
f45280cb GK |
790 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
791 | * switch to a completion coroutine later on. Let's drain all I/O here | |
792 | * to avoid that and a potential QEMU crash. | |
793 | */ | |
794 | blk_drain(blk); | |
f21d96d0 KW |
795 | bdrv_root_unref_child(blk->root); |
796 | blk->root = NULL; | |
1c95f7e1 HR |
797 | } |
798 | ||
0c3c36d6 HR |
799 | /* |
800 | * Associates a new BlockDriverState with @blk. | |
801 | */ | |
d7086422 | 802 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 803 | { |
c89bcf3a | 804 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
b441dc71 | 805 | bdrv_ref(bs); |
132ada80 | 806 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, blk->ctx, |
d7086422 KW |
807 | blk->perm, blk->shared_perm, blk, errp); |
808 | if (blk->root == NULL) { | |
809 | return -EPERM; | |
810 | } | |
3301f6c6 HR |
811 | |
812 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
813 | if (tgm->throttle_state) { |
814 | throttle_group_detach_aio_context(tgm); | |
815 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 816 | } |
d7086422 KW |
817 | |
818 | return 0; | |
0c3c36d6 HR |
819 | } |
820 | ||
981776b3 KW |
821 | /* |
822 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
823 | */ | |
824 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
825 | Error **errp) | |
826 | { | |
827 | int ret; | |
828 | ||
d35ff5e6 | 829 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
830 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
831 | if (ret < 0) { | |
832 | return ret; | |
833 | } | |
834 | } | |
835 | ||
836 | blk->perm = perm; | |
837 | blk->shared_perm = shared_perm; | |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
887354bd KW |
842 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
843 | { | |
844 | *perm = blk->perm; | |
845 | *shared_perm = blk->shared_perm; | |
846 | } | |
847 | ||
d09ea2d2 TH |
848 | /* |
849 | * Attach device model @dev to @blk. | |
850 | * Return 0 on success, -EBUSY when a device model is attached already. | |
851 | */ | |
852 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
4be74634 | 853 | { |
a7f53e26 MA |
854 | if (blk->dev) { |
855 | return -EBUSY; | |
856 | } | |
d35ff5e6 KW |
857 | |
858 | /* While migration is still incoming, we don't need to apply the | |
859 | * permissions of guest device BlockBackends. We might still have a block | |
860 | * job or NBD server writing to the image for storage migration. */ | |
861 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
862 | blk->disable_perm = true; | |
863 | } | |
864 | ||
84ebe375 | 865 | blk_ref(blk); |
a7f53e26 | 866 | blk->dev = dev; |
373340b2 | 867 | blk_iostatus_reset(blk); |
d35ff5e6 | 868 | |
a7f53e26 | 869 | return 0; |
4be74634 MA |
870 | } |
871 | ||
a7f53e26 MA |
872 | /* |
873 | * Detach device model @dev from @blk. | |
874 | * @dev must be currently attached to @blk. | |
875 | */ | |
d09ea2d2 | 876 | void blk_detach_dev(BlockBackend *blk, DeviceState *dev) |
4be74634 | 877 | { |
a7f53e26 MA |
878 | assert(blk->dev == dev); |
879 | blk->dev = NULL; | |
880 | blk->dev_ops = NULL; | |
881 | blk->dev_opaque = NULL; | |
68e9ec01 | 882 | blk->guest_block_size = 512; |
981776b3 | 883 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 884 | blk_unref(blk); |
4be74634 MA |
885 | } |
886 | ||
a7f53e26 MA |
887 | /* |
888 | * Return the device model attached to @blk if any, else null. | |
889 | */ | |
d09ea2d2 | 890 | DeviceState *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
891 | { |
892 | return blk->dev; | |
893 | } | |
894 | ||
2d76e724 KW |
895 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
896 | * device attached to the BlockBackend. */ | |
77beef83 | 897 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 | 898 | { |
d09ea2d2 | 899 | DeviceState *dev = blk->dev; |
2d76e724 KW |
900 | |
901 | if (!dev) { | |
902 | return g_strdup(""); | |
903 | } else if (dev->id) { | |
904 | return g_strdup(dev->id); | |
905 | } | |
602414d1 LM |
906 | |
907 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
908 | } |
909 | ||
1c89e1fa KW |
910 | /* |
911 | * Return the BlockBackend which has the device model @dev attached if it | |
912 | * exists, else null. | |
913 | * | |
914 | * @dev must not be null. | |
915 | */ | |
916 | BlockBackend *blk_by_dev(void *dev) | |
917 | { | |
918 | BlockBackend *blk = NULL; | |
919 | ||
920 | assert(dev != NULL); | |
921 | while ((blk = blk_all_next(blk)) != NULL) { | |
922 | if (blk->dev == dev) { | |
923 | return blk; | |
924 | } | |
925 | } | |
926 | return NULL; | |
927 | } | |
928 | ||
a7f53e26 MA |
929 | /* |
930 | * Set @blk's device model callbacks to @ops. | |
931 | * @opaque is the opaque argument to pass to the callbacks. | |
932 | * This is for use by device models. | |
933 | */ | |
934 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
935 | void *opaque) | |
936 | { | |
937 | blk->dev_ops = ops; | |
938 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
939 | |
940 | /* Are we currently quiesced? Should we enforce this right now? */ | |
941 | if (blk->quiesce_counter && ops->drained_begin) { | |
942 | ops->drained_begin(opaque); | |
943 | } | |
a7f53e26 MA |
944 | } |
945 | ||
946 | /* | |
947 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
948 | * |
949 | * If @load is true, notify of media load. This action can fail, meaning that | |
950 | * the medium cannot be loaded. @errp is set then. | |
951 | * | |
952 | * If @load is false, notify of media eject. This can never fail. | |
953 | * | |
a7f53e26 MA |
954 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
955 | */ | |
39829a01 | 956 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 MA |
957 | { |
958 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 959 | bool tray_was_open, tray_is_open; |
39829a01 | 960 | Error *local_err = NULL; |
a7f53e26 | 961 | |
f1f57066 | 962 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
963 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
964 | if (local_err) { | |
965 | assert(load == true); | |
966 | error_propagate(errp, local_err); | |
967 | return; | |
968 | } | |
f1f57066 HR |
969 | tray_is_open = blk_dev_is_tray_open(blk); |
970 | ||
971 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 972 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 973 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 974 | g_free(id); |
a7f53e26 MA |
975 | } |
976 | } | |
977 | } | |
978 | ||
5c8cab48 KW |
979 | static void blk_root_change_media(BdrvChild *child, bool load) |
980 | { | |
39829a01 | 981 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
982 | } |
983 | ||
a7f53e26 MA |
984 | /* |
985 | * Does @blk's attached device model have removable media? | |
986 | * %true if no device model is attached. | |
987 | */ | |
988 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
989 | { | |
990 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
991 | } | |
992 | ||
8f3a73bc HR |
993 | /* |
994 | * Does @blk's attached device model have a tray? | |
995 | */ | |
996 | bool blk_dev_has_tray(BlockBackend *blk) | |
997 | { | |
998 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
999 | } | |
1000 | ||
a7f53e26 MA |
1001 | /* |
1002 | * Notify @blk's attached device model of a media eject request. | |
1003 | * If @force is true, the medium is about to be yanked out forcefully. | |
1004 | */ | |
1005 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1006 | { |
a7f53e26 MA |
1007 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1008 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1009 | } | |
4be74634 MA |
1010 | } |
1011 | ||
a7f53e26 MA |
1012 | /* |
1013 | * Does @blk's attached device model have a tray, and is it open? | |
1014 | */ | |
1015 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1016 | { |
8f3a73bc | 1017 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1018 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1019 | } | |
1020 | return false; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Does @blk's attached device model have the medium locked? | |
1025 | * %false if the device model has no such lock. | |
1026 | */ | |
1027 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1028 | { | |
1029 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
1030 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1031 | } | |
1032 | return false; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * Notify @blk's attached device model of a backend size change. | |
1037 | */ | |
5c8cab48 | 1038 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1039 | { |
5c8cab48 KW |
1040 | BlockBackend *blk = child->opaque; |
1041 | ||
a7f53e26 MA |
1042 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1043 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | void blk_iostatus_enable(BlockBackend *blk) | |
1048 | { | |
373340b2 HR |
1049 | blk->iostatus_enabled = true; |
1050 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1051 | } | |
1052 | ||
1053 | /* The I/O status is only enabled if the drive explicitly | |
1054 | * enables it _and_ the VM is configured to stop on errors */ | |
1055 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1056 | { | |
1057 | return (blk->iostatus_enabled && | |
1058 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1059 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1060 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1061 | } | |
1062 | ||
1063 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1064 | { | |
1065 | return blk->iostatus; | |
1066 | } | |
1067 | ||
1068 | void blk_iostatus_disable(BlockBackend *blk) | |
1069 | { | |
1070 | blk->iostatus_enabled = false; | |
1071 | } | |
1072 | ||
1073 | void blk_iostatus_reset(BlockBackend *blk) | |
1074 | { | |
1075 | if (blk_iostatus_is_enabled(blk)) { | |
1076 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
373340b2 HR |
1077 | } |
1078 | } | |
1079 | ||
1080 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1081 | { | |
1082 | assert(blk_iostatus_is_enabled(blk)); | |
1083 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1084 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1085 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1086 | } | |
4be74634 MA |
1087 | } |
1088 | ||
c10c9d96 KW |
1089 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1090 | { | |
1091 | blk->allow_write_beyond_eof = allow; | |
1092 | } | |
1093 | ||
980b0f94 KW |
1094 | void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow) |
1095 | { | |
1096 | blk->allow_aio_context_change = allow; | |
1097 | } | |
1098 | ||
e7f7d676 HR |
1099 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
1100 | size_t size) | |
1101 | { | |
1102 | int64_t len; | |
1103 | ||
1104 | if (size > INT_MAX) { | |
1105 | return -EIO; | |
1106 | } | |
1107 | ||
c09ba36c | 1108 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
1109 | return -ENOMEDIUM; |
1110 | } | |
1111 | ||
e7f7d676 HR |
1112 | if (offset < 0) { |
1113 | return -EIO; | |
1114 | } | |
1115 | ||
c10c9d96 KW |
1116 | if (!blk->allow_write_beyond_eof) { |
1117 | len = blk_getlength(blk); | |
1118 | if (len < 0) { | |
1119 | return len; | |
1120 | } | |
1121 | ||
1122 | if (offset > len || len - offset < size) { | |
1123 | return -EIO; | |
1124 | } | |
e7f7d676 HR |
1125 | } |
1126 | ||
1127 | return 0; | |
1128 | } | |
1129 | ||
1e98fefd KW |
1130 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
1131 | unsigned int bytes, QEMUIOVector *qiov, | |
1132 | BdrvRequestFlags flags) | |
4be74634 | 1133 | { |
1e98fefd | 1134 | int ret; |
99723548 | 1135 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 1136 | |
99723548 | 1137 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1138 | |
1139 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1140 | if (ret < 0) { |
1141 | return ret; | |
1142 | } | |
1143 | ||
99723548 PB |
1144 | bdrv_inc_in_flight(bs); |
1145 | ||
441565b2 | 1146 | /* throttling disk I/O */ |
022cdc9f MP |
1147 | if (blk->public.throttle_group_member.throttle_state) { |
1148 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1149 | bytes, false); | |
441565b2 KW |
1150 | } |
1151 | ||
99723548 PB |
1152 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
1153 | bdrv_dec_in_flight(bs); | |
1154 | return ret; | |
1bf1cbc9 KW |
1155 | } |
1156 | ||
1e98fefd KW |
1157 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
1158 | unsigned int bytes, QEMUIOVector *qiov, | |
1159 | BdrvRequestFlags flags) | |
a8823a3b | 1160 | { |
bfd18d1e | 1161 | int ret; |
99723548 | 1162 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 1163 | |
99723548 | 1164 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1165 | |
bfd18d1e | 1166 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1167 | if (ret < 0) { |
1168 | return ret; | |
1169 | } | |
1170 | ||
99723548 | 1171 | bdrv_inc_in_flight(bs); |
441565b2 | 1172 | /* throttling disk I/O */ |
022cdc9f MP |
1173 | if (blk->public.throttle_group_member.throttle_state) { |
1174 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1175 | bytes, true); | |
441565b2 KW |
1176 | } |
1177 | ||
bfd18d1e KW |
1178 | if (!blk->enable_write_cache) { |
1179 | flags |= BDRV_REQ_FUA; | |
1180 | } | |
1181 | ||
99723548 PB |
1182 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
1183 | bdrv_dec_in_flight(bs); | |
1184 | return ret; | |
a8823a3b KW |
1185 | } |
1186 | ||
1bf1cbc9 KW |
1187 | typedef struct BlkRwCo { |
1188 | BlockBackend *blk; | |
1189 | int64_t offset; | |
c060332c | 1190 | void *iobuf; |
1bf1cbc9 KW |
1191 | int ret; |
1192 | BdrvRequestFlags flags; | |
1193 | } BlkRwCo; | |
1194 | ||
1195 | static void blk_read_entry(void *opaque) | |
1196 | { | |
1197 | BlkRwCo *rwco = opaque; | |
c060332c | 1198 | QEMUIOVector *qiov = rwco->iobuf; |
1bf1cbc9 | 1199 | |
c060332c DS |
1200 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, qiov->size, |
1201 | qiov, rwco->flags); | |
4720cbee | 1202 | aio_wait_kick(); |
1bf1cbc9 KW |
1203 | } |
1204 | ||
a8823a3b KW |
1205 | static void blk_write_entry(void *opaque) |
1206 | { | |
1207 | BlkRwCo *rwco = opaque; | |
c060332c | 1208 | QEMUIOVector *qiov = rwco->iobuf; |
a8823a3b | 1209 | |
c060332c DS |
1210 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, qiov->size, |
1211 | qiov, rwco->flags); | |
4720cbee | 1212 | aio_wait_kick(); |
a8823a3b KW |
1213 | } |
1214 | ||
a55d3fba KW |
1215 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1216 | int64_t bytes, CoroutineEntry co_entry, | |
1217 | BdrvRequestFlags flags) | |
1bf1cbc9 | 1218 | { |
ae5a9592 VSO |
1219 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); |
1220 | BlkRwCo rwco = { | |
1bf1cbc9 | 1221 | .blk = blk, |
a55d3fba | 1222 | .offset = offset, |
c060332c | 1223 | .iobuf = &qiov, |
fc1453cd | 1224 | .flags = flags, |
1bf1cbc9 KW |
1225 | .ret = NOT_DONE, |
1226 | }; | |
1227 | ||
35f106e6 PB |
1228 | if (qemu_in_coroutine()) { |
1229 | /* Fast-path if already in coroutine context */ | |
1230 | co_entry(&rwco); | |
1231 | } else { | |
1232 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
e92f0e19 | 1233 | bdrv_coroutine_enter(blk_bs(blk), co); |
35f106e6 PB |
1234 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); |
1235 | } | |
1bf1cbc9 KW |
1236 | |
1237 | return rwco.ret; | |
4be74634 MA |
1238 | } |
1239 | ||
b7d17f9f EB |
1240 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1241 | int count) | |
4be74634 | 1242 | { |
5bd51196 KW |
1243 | int ret; |
1244 | ||
b7d17f9f | 1245 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1246 | if (ret < 0) { |
1247 | return ret; | |
1248 | } | |
1249 | ||
c2066af0 | 1250 | blk_root_drained_begin(blk->root); |
b7d17f9f | 1251 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 1252 | blk_root_drained_end(blk->root); |
5bd51196 | 1253 | return ret; |
4be74634 MA |
1254 | } |
1255 | ||
d004bd52 | 1256 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 1257 | int bytes, BdrvRequestFlags flags) |
0df89e8e | 1258 | { |
f5a5ca79 | 1259 | return blk_prw(blk, offset, NULL, bytes, blk_write_entry, |
983a1600 | 1260 | flags | BDRV_REQ_ZERO_WRITE); |
0df89e8e KW |
1261 | } |
1262 | ||
720ff280 KW |
1263 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1264 | { | |
1265 | return bdrv_make_zero(blk->root, flags); | |
1266 | } | |
1267 | ||
c90e2a9c | 1268 | void blk_inc_in_flight(BlockBackend *blk) |
33f2a757 SH |
1269 | { |
1270 | atomic_inc(&blk->in_flight); | |
1271 | } | |
1272 | ||
c90e2a9c | 1273 | void blk_dec_in_flight(BlockBackend *blk) |
33f2a757 SH |
1274 | { |
1275 | atomic_dec(&blk->in_flight); | |
cfe29d82 | 1276 | aio_wait_kick(); |
33f2a757 SH |
1277 | } |
1278 | ||
e7f7d676 HR |
1279 | static void error_callback_bh(void *opaque) |
1280 | { | |
1281 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1282 | |
33f2a757 | 1283 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1284 | acb->common.cb(acb->common.opaque, acb->ret); |
1285 | qemu_aio_unref(acb); | |
1286 | } | |
1287 | ||
ca78ecfa PL |
1288 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1289 | BlockCompletionFunc *cb, | |
1290 | void *opaque, int ret) | |
e7f7d676 HR |
1291 | { |
1292 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 1293 | |
33f2a757 | 1294 | blk_inc_in_flight(blk); |
e7f7d676 | 1295 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1296 | acb->blk = blk; |
e7f7d676 HR |
1297 | acb->ret = ret; |
1298 | ||
fffb6e12 | 1299 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
1300 | return &acb->common; |
1301 | } | |
1302 | ||
57d6a428 KW |
1303 | typedef struct BlkAioEmAIOCB { |
1304 | BlockAIOCB common; | |
1305 | BlkRwCo rwco; | |
7fa84cd8 | 1306 | int bytes; |
57d6a428 | 1307 | bool has_returned; |
57d6a428 KW |
1308 | } BlkAioEmAIOCB; |
1309 | ||
1310 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1311 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1312 | }; | |
1313 | ||
1314 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1315 | { | |
57d6a428 KW |
1316 | if (acb->has_returned) { |
1317 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1318 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1319 | qemu_aio_unref(acb); |
1320 | } | |
1321 | } | |
1322 | ||
1323 | static void blk_aio_complete_bh(void *opaque) | |
1324 | { | |
fffb6e12 | 1325 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1326 | assert(acb->has_returned); |
1327 | blk_aio_complete(acb); | |
57d6a428 KW |
1328 | } |
1329 | ||
7fa84cd8 | 1330 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
c060332c | 1331 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1332 | BdrvRequestFlags flags, |
1333 | BlockCompletionFunc *cb, void *opaque) | |
1334 | { | |
1335 | BlkAioEmAIOCB *acb; | |
1336 | Coroutine *co; | |
1337 | ||
33f2a757 | 1338 | blk_inc_in_flight(blk); |
57d6a428 KW |
1339 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1340 | acb->rwco = (BlkRwCo) { | |
1341 | .blk = blk, | |
1342 | .offset = offset, | |
c060332c | 1343 | .iobuf = iobuf, |
57d6a428 KW |
1344 | .flags = flags, |
1345 | .ret = NOT_DONE, | |
1346 | }; | |
7fa84cd8 | 1347 | acb->bytes = bytes; |
57d6a428 KW |
1348 | acb->has_returned = false; |
1349 | ||
0b8b8753 | 1350 | co = qemu_coroutine_create(co_entry, acb); |
e92f0e19 | 1351 | bdrv_coroutine_enter(blk_bs(blk), co); |
57d6a428 KW |
1352 | |
1353 | acb->has_returned = true; | |
1354 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1355 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1356 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1357 | } |
1358 | ||
1359 | return &acb->common; | |
1360 | } | |
1361 | ||
1362 | static void blk_aio_read_entry(void *opaque) | |
1363 | { | |
1364 | BlkAioEmAIOCB *acb = opaque; | |
1365 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1366 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1367 | |
c060332c | 1368 | assert(qiov->size == acb->bytes); |
7fa84cd8 | 1369 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, |
c060332c | 1370 | qiov, rwco->flags); |
57d6a428 KW |
1371 | blk_aio_complete(acb); |
1372 | } | |
1373 | ||
1374 | static void blk_aio_write_entry(void *opaque) | |
1375 | { | |
1376 | BlkAioEmAIOCB *acb = opaque; | |
1377 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1378 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1379 | |
c060332c | 1380 | assert(!qiov || qiov->size == acb->bytes); |
7fa84cd8 | 1381 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, |
c060332c | 1382 | qiov, rwco->flags); |
57d6a428 KW |
1383 | blk_aio_complete(acb); |
1384 | } | |
1385 | ||
d004bd52 EB |
1386 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1387 | int count, BdrvRequestFlags flags, | |
1388 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1389 | { |
983a1600 EB |
1390 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1391 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1392 | } |
1393 | ||
1394 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1395 | { | |
a55d3fba | 1396 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1397 | if (ret < 0) { |
1398 | return ret; | |
1399 | } | |
a55d3fba | 1400 | return count; |
4be74634 MA |
1401 | } |
1402 | ||
8341f00d EB |
1403 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1404 | BdrvRequestFlags flags) | |
4be74634 | 1405 | { |
8341f00d EB |
1406 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1407 | flags); | |
e7f7d676 HR |
1408 | if (ret < 0) { |
1409 | return ret; | |
1410 | } | |
a55d3fba | 1411 | return count; |
4be74634 MA |
1412 | } |
1413 | ||
1414 | int64_t blk_getlength(BlockBackend *blk) | |
1415 | { | |
c09ba36c HR |
1416 | if (!blk_is_available(blk)) { |
1417 | return -ENOMEDIUM; | |
1418 | } | |
1419 | ||
f21d96d0 | 1420 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1421 | } |
1422 | ||
1423 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1424 | { | |
f21d96d0 | 1425 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1426 | *nb_sectors_ptr = 0; |
1427 | } else { | |
f21d96d0 | 1428 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1429 | } |
4be74634 MA |
1430 | } |
1431 | ||
1ef01253 HR |
1432 | int64_t blk_nb_sectors(BlockBackend *blk) |
1433 | { | |
c09ba36c HR |
1434 | if (!blk_is_available(blk)) { |
1435 | return -ENOMEDIUM; | |
1436 | } | |
1437 | ||
f21d96d0 | 1438 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1439 | } |
1440 | ||
60cb2fa7 EB |
1441 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1442 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1443 | BlockCompletionFunc *cb, void *opaque) | |
1444 | { | |
1445 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1446 | blk_aio_read_entry, flags, cb, opaque); | |
1447 | } | |
1448 | ||
60cb2fa7 EB |
1449 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1450 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1451 | BlockCompletionFunc *cb, void *opaque) | |
1452 | { | |
1453 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1454 | blk_aio_write_entry, flags, cb, opaque); | |
1455 | } | |
1456 | ||
be07a889 KW |
1457 | static void blk_aio_flush_entry(void *opaque) |
1458 | { | |
1459 | BlkAioEmAIOCB *acb = opaque; | |
1460 | BlkRwCo *rwco = &acb->rwco; | |
1461 | ||
1462 | rwco->ret = blk_co_flush(rwco->blk); | |
1463 | blk_aio_complete(acb); | |
1464 | } | |
1465 | ||
4be74634 MA |
1466 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1467 | BlockCompletionFunc *cb, void *opaque) | |
1468 | { | |
be07a889 | 1469 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1470 | } |
1471 | ||
8c2e3dd5 KW |
1472 | static void blk_aio_pdiscard_entry(void *opaque) |
1473 | { | |
1474 | BlkAioEmAIOCB *acb = opaque; | |
1475 | BlkRwCo *rwco = &acb->rwco; | |
1476 | ||
1477 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1478 | blk_aio_complete(acb); | |
1479 | } | |
1480 | ||
1c6c4bb7 | 1481 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
f5a5ca79 | 1482 | int64_t offset, int bytes, |
1c6c4bb7 | 1483 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1484 | { |
f5a5ca79 | 1485 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
8c2e3dd5 | 1486 | cb, opaque); |
4be74634 MA |
1487 | } |
1488 | ||
1489 | void blk_aio_cancel(BlockAIOCB *acb) | |
1490 | { | |
1491 | bdrv_aio_cancel(acb); | |
1492 | } | |
1493 | ||
1494 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1495 | { | |
1496 | bdrv_aio_cancel_async(acb); | |
1497 | } | |
1498 | ||
48af776a | 1499 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1500 | { |
c09ba36c HR |
1501 | if (!blk_is_available(blk)) { |
1502 | return -ENOMEDIUM; | |
1503 | } | |
1504 | ||
48af776a KW |
1505 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1506 | } | |
1507 | ||
1508 | static void blk_ioctl_entry(void *opaque) | |
1509 | { | |
1510 | BlkRwCo *rwco = opaque; | |
c060332c DS |
1511 | QEMUIOVector *qiov = rwco->iobuf; |
1512 | ||
48af776a | 1513 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, |
c060332c | 1514 | qiov->iov[0].iov_base); |
4720cbee | 1515 | aio_wait_kick(); |
48af776a KW |
1516 | } |
1517 | ||
1518 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1519 | { | |
1520 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1521 | } | |
1522 | ||
1523 | static void blk_aio_ioctl_entry(void *opaque) | |
1524 | { | |
1525 | BlkAioEmAIOCB *acb = opaque; | |
1526 | BlkRwCo *rwco = &acb->rwco; | |
1527 | ||
c060332c DS |
1528 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
1529 | ||
48af776a | 1530 | blk_aio_complete(acb); |
4be74634 MA |
1531 | } |
1532 | ||
1533 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1534 | BlockCompletionFunc *cb, void *opaque) | |
1535 | { | |
c060332c | 1536 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1537 | } |
1538 | ||
f5a5ca79 | 1539 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
2bb0dce7 | 1540 | { |
f5a5ca79 | 1541 | int ret = blk_check_byte_request(blk, offset, bytes); |
e7f7d676 HR |
1542 | if (ret < 0) { |
1543 | return ret; | |
1544 | } | |
1545 | ||
0b9fd3f4 | 1546 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1547 | } |
1548 | ||
1549 | int blk_co_flush(BlockBackend *blk) | |
1550 | { | |
c09ba36c HR |
1551 | if (!blk_is_available(blk)) { |
1552 | return -ENOMEDIUM; | |
1553 | } | |
1554 | ||
f21d96d0 | 1555 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1556 | } |
1557 | ||
be07a889 | 1558 | static void blk_flush_entry(void *opaque) |
4be74634 | 1559 | { |
be07a889 KW |
1560 | BlkRwCo *rwco = opaque; |
1561 | rwco->ret = blk_co_flush(rwco->blk); | |
4720cbee | 1562 | aio_wait_kick(); |
be07a889 | 1563 | } |
c09ba36c | 1564 | |
be07a889 KW |
1565 | int blk_flush(BlockBackend *blk) |
1566 | { | |
1567 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1568 | } |
1569 | ||
97b0385a AY |
1570 | void blk_drain(BlockBackend *blk) |
1571 | { | |
33f2a757 SH |
1572 | BlockDriverState *bs = blk_bs(blk); |
1573 | ||
1574 | if (bs) { | |
1575 | bdrv_drained_begin(bs); | |
1576 | } | |
1577 | ||
1578 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 KW |
1579 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
1580 | atomic_mb_read(&blk->in_flight) > 0); | |
33f2a757 SH |
1581 | |
1582 | if (bs) { | |
1583 | bdrv_drained_end(bs); | |
a46fc9c9 | 1584 | } |
97b0385a AY |
1585 | } |
1586 | ||
4be74634 MA |
1587 | void blk_drain_all(void) |
1588 | { | |
33f2a757 SH |
1589 | BlockBackend *blk = NULL; |
1590 | ||
1591 | bdrv_drain_all_begin(); | |
1592 | ||
1593 | while ((blk = blk_all_next(blk)) != NULL) { | |
1594 | AioContext *ctx = blk_get_aio_context(blk); | |
1595 | ||
1596 | aio_context_acquire(ctx); | |
1597 | ||
1598 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 1599 | AIO_WAIT_WHILE(ctx, atomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1600 | |
1601 | aio_context_release(ctx); | |
1602 | } | |
1603 | ||
1604 | bdrv_drain_all_end(); | |
4be74634 MA |
1605 | } |
1606 | ||
373340b2 HR |
1607 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1608 | BlockdevOnError on_write_error) | |
1609 | { | |
1610 | blk->on_read_error = on_read_error; | |
1611 | blk->on_write_error = on_write_error; | |
1612 | } | |
1613 | ||
4be74634 MA |
1614 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1615 | { | |
373340b2 | 1616 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1617 | } |
1618 | ||
1619 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1620 | int error) | |
1621 | { | |
373340b2 HR |
1622 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1623 | ||
1624 | switch (on_err) { | |
1625 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1626 | return (error == ENOSPC) ? | |
1627 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1628 | case BLOCKDEV_ON_ERROR_STOP: | |
1629 | return BLOCK_ERROR_ACTION_STOP; | |
1630 | case BLOCKDEV_ON_ERROR_REPORT: | |
1631 | return BLOCK_ERROR_ACTION_REPORT; | |
1632 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1633 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1634 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1635 | default: |
1636 | abort(); | |
1637 | } | |
4be74634 MA |
1638 | } |
1639 | ||
373340b2 HR |
1640 | static void send_qmp_error_event(BlockBackend *blk, |
1641 | BlockErrorAction action, | |
1642 | bool is_read, int error) | |
1643 | { | |
1644 | IoOperationType optype; | |
bfe1a14c | 1645 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
1646 | |
1647 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
bfe1a14c KW |
1648 | qapi_event_send_block_io_error(blk_name(blk), !!bs, |
1649 | bs ? bdrv_get_node_name(bs) : NULL, optype, | |
2bf7e10f | 1650 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 1651 | error == ENOSPC, strerror(error)); |
373340b2 HR |
1652 | } |
1653 | ||
1654 | /* This is done by device models because, while the block layer knows | |
1655 | * about the error, it does not know whether an operation comes from | |
1656 | * the device or the block layer (from a job, for example). | |
1657 | */ | |
4be74634 MA |
1658 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1659 | bool is_read, int error) | |
1660 | { | |
373340b2 HR |
1661 | assert(error >= 0); |
1662 | ||
1663 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1664 | /* First set the iostatus, so that "info block" returns an iostatus | |
1665 | * that matches the events raised so far (an additional error iostatus | |
1666 | * is fine, but not a lost one). | |
1667 | */ | |
1668 | blk_iostatus_set_err(blk, error); | |
1669 | ||
1670 | /* Then raise the request to stop the VM and the event. | |
1671 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1672 | * it ensures that the STOP event always comes after the | |
1673 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1674 | * can observe the STOP event and do a "cont" before the STOP | |
1675 | * event is issued, the VM will not stop. In this case, vm_start() | |
1676 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1677 | */ | |
1678 | qemu_system_vmstop_request_prepare(); | |
1679 | send_qmp_error_event(blk, action, is_read, error); | |
1680 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1681 | } else { | |
1682 | send_qmp_error_event(blk, action, is_read, error); | |
1683 | } | |
4be74634 MA |
1684 | } |
1685 | ||
96710565 | 1686 | bool blk_is_read_only(BlockBackend *blk) |
4be74634 | 1687 | { |
f21d96d0 KW |
1688 | BlockDriverState *bs = blk_bs(blk); |
1689 | ||
1690 | if (bs) { | |
1691 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1692 | } else { |
1693 | return blk->root_state.read_only; | |
1694 | } | |
4be74634 MA |
1695 | } |
1696 | ||
96710565 | 1697 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 1698 | { |
f21d96d0 KW |
1699 | BlockDriverState *bs = blk_bs(blk); |
1700 | ||
1701 | if (!bs) { | |
96710565 | 1702 | return false; |
a46fc9c9 HR |
1703 | } |
1704 | ||
f21d96d0 | 1705 | return bdrv_is_sg(bs); |
4be74634 MA |
1706 | } |
1707 | ||
96710565 | 1708 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 1709 | { |
bfd18d1e | 1710 | return blk->enable_write_cache; |
4be74634 MA |
1711 | } |
1712 | ||
1713 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1714 | { | |
bfd18d1e | 1715 | blk->enable_write_cache = wce; |
4be74634 MA |
1716 | } |
1717 | ||
2bb0dce7 HR |
1718 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1719 | { | |
f21d96d0 KW |
1720 | BlockDriverState *bs = blk_bs(blk); |
1721 | ||
1722 | if (!bs) { | |
c09ba36c HR |
1723 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1724 | return; | |
1725 | } | |
1726 | ||
f21d96d0 | 1727 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1728 | } |
1729 | ||
e031f750 | 1730 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1731 | { |
f21d96d0 KW |
1732 | BlockDriverState *bs = blk_bs(blk); |
1733 | ||
1734 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1735 | } |
1736 | ||
1737 | bool blk_is_available(BlockBackend *blk) | |
1738 | { | |
1739 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1740 | } |
1741 | ||
1742 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1743 | { | |
f21d96d0 KW |
1744 | BlockDriverState *bs = blk_bs(blk); |
1745 | ||
1746 | if (bs) { | |
1747 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1748 | } |
4be74634 MA |
1749 | } |
1750 | ||
1751 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1752 | { | |
f21d96d0 | 1753 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1754 | char *id; |
1755 | ||
f21d96d0 KW |
1756 | if (bs) { |
1757 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1758 | } |
c47ee043 JS |
1759 | |
1760 | /* Whether or not we ejected on the backend, | |
1761 | * the frontend experienced a tray event. */ | |
1762 | id = blk_get_attached_dev_id(blk); | |
1763 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 1764 | eject_flag); |
c47ee043 | 1765 | g_free(id); |
4be74634 MA |
1766 | } |
1767 | ||
1768 | int blk_get_flags(BlockBackend *blk) | |
1769 | { | |
f21d96d0 KW |
1770 | BlockDriverState *bs = blk_bs(blk); |
1771 | ||
1772 | if (bs) { | |
1773 | return bdrv_get_flags(bs); | |
061959e8 HR |
1774 | } else { |
1775 | return blk->root_state.open_flags; | |
1776 | } | |
4be74634 MA |
1777 | } |
1778 | ||
4841211e EB |
1779 | /* Returns the minimum request alignment, in bytes; guaranteed nonzero */ |
1780 | uint32_t blk_get_request_alignment(BlockBackend *blk) | |
1781 | { | |
1782 | BlockDriverState *bs = blk_bs(blk); | |
1783 | return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE; | |
1784 | } | |
1785 | ||
5def6b80 EB |
1786 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1787 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1788 | { |
f21d96d0 | 1789 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1790 | uint32_t max = 0; |
f21d96d0 KW |
1791 | |
1792 | if (bs) { | |
5def6b80 | 1793 | max = bs->bl.max_transfer; |
a46fc9c9 | 1794 | } |
5def6b80 | 1795 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1796 | } |
1797 | ||
648296e0 SH |
1798 | int blk_get_max_iov(BlockBackend *blk) |
1799 | { | |
f21d96d0 | 1800 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1801 | } |
1802 | ||
4be74634 MA |
1803 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1804 | { | |
68e9ec01 | 1805 | blk->guest_block_size = align; |
4be74634 MA |
1806 | } |
1807 | ||
f1c17521 PB |
1808 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1809 | { | |
f21d96d0 | 1810 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1811 | } |
1812 | ||
4be74634 MA |
1813 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1814 | { | |
f21d96d0 | 1815 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1816 | } |
1817 | ||
1818 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1819 | { | |
f21d96d0 KW |
1820 | BlockDriverState *bs = blk_bs(blk); |
1821 | ||
1822 | if (!bs) { | |
a46fc9c9 HR |
1823 | return false; |
1824 | } | |
1825 | ||
f21d96d0 | 1826 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1827 | } |
1828 | ||
1829 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1830 | { | |
f21d96d0 KW |
1831 | BlockDriverState *bs = blk_bs(blk); |
1832 | ||
1833 | if (bs) { | |
1834 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1835 | } |
4be74634 MA |
1836 | } |
1837 | ||
1838 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1839 | { | |
f21d96d0 KW |
1840 | BlockDriverState *bs = blk_bs(blk); |
1841 | ||
1842 | if (bs) { | |
1843 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1844 | } |
4be74634 MA |
1845 | } |
1846 | ||
1847 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1848 | { | |
f21d96d0 KW |
1849 | BlockDriverState *bs = blk_bs(blk); |
1850 | ||
1851 | if (bs) { | |
1852 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1853 | } |
4be74634 MA |
1854 | } |
1855 | ||
1856 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1857 | { | |
d861ab3a KW |
1858 | BlockDriverState *bs = blk_bs(blk); |
1859 | ||
d861ab3a | 1860 | if (bs) { |
132ada80 KW |
1861 | AioContext *ctx = bdrv_get_aio_context(blk_bs(blk)); |
1862 | assert(ctx == blk->ctx); | |
d861ab3a KW |
1863 | } |
1864 | ||
1865 | return blk->ctx; | |
4981bdec HR |
1866 | } |
1867 | ||
1868 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1869 | { | |
1870 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1871 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1872 | } |
1873 | ||
97896a48 KW |
1874 | static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context, |
1875 | bool update_root_node, Error **errp) | |
4be74634 | 1876 | { |
f21d96d0 | 1877 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 1878 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
97896a48 | 1879 | int ret; |
f21d96d0 KW |
1880 | |
1881 | if (bs) { | |
97896a48 KW |
1882 | if (update_root_node) { |
1883 | ret = bdrv_child_try_set_aio_context(bs, new_context, blk->root, | |
1884 | errp); | |
1885 | if (ret < 0) { | |
1886 | return ret; | |
1887 | } | |
1888 | } | |
c61791fc | 1889 | if (tgm->throttle_state) { |
dc868fb0 | 1890 | bdrv_drained_begin(bs); |
c61791fc MP |
1891 | throttle_group_detach_aio_context(tgm); |
1892 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 1893 | bdrv_drained_end(bs); |
7ca7f0f6 | 1894 | } |
a46fc9c9 | 1895 | } |
97896a48 | 1896 | |
d861ab3a | 1897 | blk->ctx = new_context; |
97896a48 | 1898 | return 0; |
4be74634 MA |
1899 | } |
1900 | ||
97896a48 KW |
1901 | int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, |
1902 | Error **errp) | |
38475269 | 1903 | { |
97896a48 | 1904 | return blk_do_set_aio_context(blk, new_context, true, errp); |
38475269 KW |
1905 | } |
1906 | ||
1907 | static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx, | |
1908 | GSList **ignore, Error **errp) | |
1909 | { | |
1910 | BlockBackend *blk = child->opaque; | |
1911 | ||
980b0f94 KW |
1912 | if (blk->allow_aio_context_change) { |
1913 | return true; | |
1914 | } | |
1915 | ||
38475269 KW |
1916 | /* Only manually created BlockBackends that are not attached to anything |
1917 | * can change their AioContext without updating their user. */ | |
1918 | if (!blk->name || blk->dev) { | |
1919 | /* TODO Add BB name/QOM path */ | |
1920 | error_setg(errp, "Cannot change iothread of active block backend"); | |
1921 | return false; | |
1922 | } | |
1923 | ||
1924 | return true; | |
1925 | } | |
1926 | ||
1927 | static void blk_root_set_aio_ctx(BdrvChild *child, AioContext *ctx, | |
1928 | GSList **ignore) | |
1929 | { | |
1930 | BlockBackend *blk = child->opaque; | |
97896a48 | 1931 | blk_do_set_aio_context(blk, ctx, false, &error_abort); |
38475269 KW |
1932 | } |
1933 | ||
2019ba0a HR |
1934 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1935 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1936 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1937 | { | |
d03654ea | 1938 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
1939 | BlockDriverState *bs = blk_bs(blk); |
1940 | ||
d03654ea SH |
1941 | notifier = g_new(BlockBackendAioNotifier, 1); |
1942 | notifier->attached_aio_context = attached_aio_context; | |
1943 | notifier->detach_aio_context = detach_aio_context; | |
1944 | notifier->opaque = opaque; | |
1945 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
1946 | ||
f21d96d0 KW |
1947 | if (bs) { |
1948 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1949 | detach_aio_context, opaque); |
1950 | } | |
2019ba0a HR |
1951 | } |
1952 | ||
1953 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1954 | void (*attached_aio_context)(AioContext *, | |
1955 | void *), | |
1956 | void (*detach_aio_context)(void *), | |
1957 | void *opaque) | |
1958 | { | |
d03654ea | 1959 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
1960 | BlockDriverState *bs = blk_bs(blk); |
1961 | ||
1962 | if (bs) { | |
1963 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1964 | detach_aio_context, opaque); |
1965 | } | |
d03654ea SH |
1966 | |
1967 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
1968 | if (notifier->attached_aio_context == attached_aio_context && | |
1969 | notifier->detach_aio_context == detach_aio_context && | |
1970 | notifier->opaque == opaque) { | |
1971 | QLIST_REMOVE(notifier, list); | |
1972 | g_free(notifier); | |
1973 | return; | |
1974 | } | |
1975 | } | |
1976 | ||
1977 | abort(); | |
2019ba0a HR |
1978 | } |
1979 | ||
3301f6c6 HR |
1980 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1981 | { | |
1982 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1983 | } | |
1984 | ||
1985 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1986 | { | |
1987 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1988 | } | |
1989 | ||
4be74634 MA |
1990 | void blk_io_plug(BlockBackend *blk) |
1991 | { | |
f21d96d0 KW |
1992 | BlockDriverState *bs = blk_bs(blk); |
1993 | ||
1994 | if (bs) { | |
1995 | bdrv_io_plug(bs); | |
a46fc9c9 | 1996 | } |
4be74634 MA |
1997 | } |
1998 | ||
1999 | void blk_io_unplug(BlockBackend *blk) | |
2000 | { | |
f21d96d0 KW |
2001 | BlockDriverState *bs = blk_bs(blk); |
2002 | ||
2003 | if (bs) { | |
2004 | bdrv_io_unplug(bs); | |
a46fc9c9 | 2005 | } |
4be74634 MA |
2006 | } |
2007 | ||
2008 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
2009 | { | |
7f0e9da6 | 2010 | return &blk->stats; |
4be74634 MA |
2011 | } |
2012 | ||
2013 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
2014 | BlockCompletionFunc *cb, void *opaque) | |
2015 | { | |
2016 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
2017 | } | |
1ef01253 | 2018 | |
d004bd52 | 2019 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 2020 | int bytes, BdrvRequestFlags flags) |
1ef01253 | 2021 | { |
f5a5ca79 | 2022 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 2023 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
2024 | } |
2025 | ||
fe5c1355 PB |
2026 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
2027 | int count) | |
1ef01253 | 2028 | { |
35fadca8 PB |
2029 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
2030 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2031 | } |
2032 | ||
3a691c50 HR |
2033 | int blk_truncate(BlockBackend *blk, int64_t offset, PreallocMode prealloc, |
2034 | Error **errp) | |
1ef01253 | 2035 | { |
c09ba36c | 2036 | if (!blk_is_available(blk)) { |
ed3d2ec9 | 2037 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2038 | return -ENOMEDIUM; |
2039 | } | |
2040 | ||
3a691c50 | 2041 | return bdrv_truncate(blk->root, offset, prealloc, errp); |
1ef01253 HR |
2042 | } |
2043 | ||
8c2e3dd5 | 2044 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 2045 | { |
8c2e3dd5 | 2046 | BlkRwCo *rwco = opaque; |
c060332c DS |
2047 | QEMUIOVector *qiov = rwco->iobuf; |
2048 | ||
2049 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, qiov->size); | |
4720cbee | 2050 | aio_wait_kick(); |
8c2e3dd5 | 2051 | } |
e7f7d676 | 2052 | |
f5a5ca79 | 2053 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
8c2e3dd5 | 2054 | { |
f5a5ca79 | 2055 | return blk_prw(blk, offset, NULL, bytes, blk_pdiscard_entry, 0); |
1ef01253 HR |
2056 | } |
2057 | ||
2058 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
2059 | int64_t pos, int size) | |
2060 | { | |
bfd18d1e KW |
2061 | int ret; |
2062 | ||
c09ba36c HR |
2063 | if (!blk_is_available(blk)) { |
2064 | return -ENOMEDIUM; | |
2065 | } | |
2066 | ||
bfd18d1e KW |
2067 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2068 | if (ret < 0) { | |
2069 | return ret; | |
2070 | } | |
2071 | ||
2072 | if (ret == size && !blk->enable_write_cache) { | |
2073 | ret = bdrv_flush(blk_bs(blk)); | |
2074 | } | |
2075 | ||
2076 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2077 | } |
2078 | ||
2079 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2080 | { | |
c09ba36c HR |
2081 | if (!blk_is_available(blk)) { |
2082 | return -ENOMEDIUM; | |
2083 | } | |
2084 | ||
f21d96d0 | 2085 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2086 | } |
f0272c4d ET |
2087 | |
2088 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2089 | { | |
c09ba36c HR |
2090 | if (!blk_is_available(blk)) { |
2091 | return -ENOMEDIUM; | |
2092 | } | |
2093 | ||
f21d96d0 | 2094 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2095 | } |
2096 | ||
2097 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2098 | { | |
c09ba36c HR |
2099 | if (!blk_is_available(blk)) { |
2100 | return -ENOMEDIUM; | |
2101 | } | |
2102 | ||
f21d96d0 | 2103 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2104 | } |
281d22d8 HR |
2105 | |
2106 | /* | |
2107 | * Updates the BlockBackendRootState object with data from the currently | |
2108 | * attached BlockDriverState. | |
2109 | */ | |
2110 | void blk_update_root_state(BlockBackend *blk) | |
2111 | { | |
f21d96d0 | 2112 | assert(blk->root); |
281d22d8 | 2113 | |
f21d96d0 KW |
2114 | blk->root_state.open_flags = blk->root->bs->open_flags; |
2115 | blk->root_state.read_only = blk->root->bs->read_only; | |
2116 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
2117 | } |
2118 | ||
38cb18f5 | 2119 | /* |
b85114f8 KW |
2120 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2121 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2122 | */ |
b85114f8 | 2123 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2124 | { |
b85114f8 | 2125 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2126 | } |
2127 | ||
2128 | /* | |
2129 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2130 | * supposed to inherit the root state. | |
2131 | */ | |
2132 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2133 | { | |
2134 | int bs_flags; | |
2135 | ||
2136 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
2137 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
2138 | ||
2139 | return bs_flags; | |
2140 | } | |
2141 | ||
281d22d8 HR |
2142 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2143 | { | |
2144 | return &blk->root_state; | |
2145 | } | |
1393f212 HR |
2146 | |
2147 | int blk_commit_all(void) | |
2148 | { | |
fe1a9cbc HR |
2149 | BlockBackend *blk = NULL; |
2150 | ||
2151 | while ((blk = blk_all_next(blk)) != NULL) { | |
2152 | AioContext *aio_context = blk_get_aio_context(blk); | |
2153 | ||
2154 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
2155 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
2156 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
2157 | if (ret < 0) { |
2158 | aio_context_release(aio_context); | |
2159 | return ret; | |
2160 | } | |
2161 | } | |
2162 | aio_context_release(aio_context); | |
2163 | } | |
2164 | return 0; | |
2165 | } | |
2166 | ||
97148076 KW |
2167 | |
2168 | /* throttling disk I/O limits */ | |
2169 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2170 | { | |
022cdc9f | 2171 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2172 | } |
2173 | ||
2174 | void blk_io_limits_disable(BlockBackend *blk) | |
2175 | { | |
48bf7ea8 AG |
2176 | BlockDriverState *bs = blk_bs(blk); |
2177 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2178 | assert(tgm->throttle_state); | |
2179 | if (bs) { | |
2180 | bdrv_drained_begin(bs); | |
2181 | } | |
2182 | throttle_group_unregister_tgm(tgm); | |
2183 | if (bs) { | |
2184 | bdrv_drained_end(bs); | |
2185 | } | |
97148076 KW |
2186 | } |
2187 | ||
2188 | /* should be called before blk_set_io_limits if a limit is set */ | |
2189 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2190 | { | |
022cdc9f | 2191 | assert(!blk->public.throttle_group_member.throttle_state); |
c61791fc MP |
2192 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2193 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2194 | } |
2195 | ||
2196 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2197 | { | |
2198 | /* this BB is not part of any group */ | |
022cdc9f | 2199 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2200 | return; |
2201 | } | |
2202 | ||
2203 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2204 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2205 | group)) { | |
97148076 KW |
2206 | return; |
2207 | } | |
2208 | ||
2209 | /* need to change the group this bs belong to */ | |
2210 | blk_io_limits_disable(blk); | |
2211 | blk_io_limits_enable(blk, group); | |
2212 | } | |
c2066af0 KW |
2213 | |
2214 | static void blk_root_drained_begin(BdrvChild *child) | |
2215 | { | |
2216 | BlockBackend *blk = child->opaque; | |
2217 | ||
f4d9cc88 JS |
2218 | if (++blk->quiesce_counter == 1) { |
2219 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
2220 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2221 | } | |
2222 | } | |
2223 | ||
36fe1331 KW |
2224 | /* Note that blk->root may not be accessible here yet if we are just |
2225 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2226 | ||
022cdc9f MP |
2227 | if (atomic_fetch_inc(&blk->public.throttle_group_member.io_limits_disabled) == 0) { |
2228 | throttle_group_restart_tgm(&blk->public.throttle_group_member); | |
c2066af0 KW |
2229 | } |
2230 | } | |
2231 | ||
fe5258a5 KW |
2232 | static bool blk_root_drained_poll(BdrvChild *child) |
2233 | { | |
2234 | BlockBackend *blk = child->opaque; | |
2235 | assert(blk->quiesce_counter); | |
2236 | return !!blk->in_flight; | |
2237 | } | |
2238 | ||
c2066af0 KW |
2239 | static void blk_root_drained_end(BdrvChild *child) |
2240 | { | |
2241 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 2242 | assert(blk->quiesce_counter); |
c2066af0 | 2243 | |
022cdc9f MP |
2244 | assert(blk->public.throttle_group_member.io_limits_disabled); |
2245 | atomic_dec(&blk->public.throttle_group_member.io_limits_disabled); | |
f4d9cc88 JS |
2246 | |
2247 | if (--blk->quiesce_counter == 0) { | |
2248 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
2249 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2250 | } | |
2251 | } | |
c2066af0 | 2252 | } |
23d0ba93 FZ |
2253 | |
2254 | void blk_register_buf(BlockBackend *blk, void *host, size_t size) | |
2255 | { | |
2256 | bdrv_register_buf(blk_bs(blk), host, size); | |
2257 | } | |
2258 | ||
2259 | void blk_unregister_buf(BlockBackend *blk, void *host) | |
2260 | { | |
2261 | bdrv_unregister_buf(blk_bs(blk), host); | |
2262 | } | |
b5679fa4 FZ |
2263 | |
2264 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2265 | BlockBackend *blk_out, int64_t off_out, | |
67b51fb9 VSO |
2266 | int bytes, BdrvRequestFlags read_flags, |
2267 | BdrvRequestFlags write_flags) | |
b5679fa4 FZ |
2268 | { |
2269 | int r; | |
2270 | r = blk_check_byte_request(blk_in, off_in, bytes); | |
2271 | if (r) { | |
2272 | return r; | |
2273 | } | |
2274 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2275 | if (r) { | |
2276 | return r; | |
2277 | } | |
2278 | return bdrv_co_copy_range(blk_in->root, off_in, | |
2279 | blk_out->root, off_out, | |
67b51fb9 | 2280 | bytes, read_flags, write_flags); |
b5679fa4 | 2281 | } |
5d3b4e99 VSO |
2282 | |
2283 | const BdrvChild *blk_root(BlockBackend *blk) | |
2284 | { | |
2285 | return blk->root; | |
2286 | } |