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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; |
26f8b3a8 | 45 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 46 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 47 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 48 | BlockBackendPublic public; |
a7f53e26 MA |
49 | |
50 | void *dev; /* attached device model, if any */ | |
bbc8ea98 | 51 | bool legacy_dev; /* true if dev is not a DeviceState */ |
a7f53e26 MA |
52 | /* TODO change to DeviceState when all users are qdevified */ |
53 | const BlockDevOps *dev_ops; | |
54 | void *dev_opaque; | |
68e9ec01 HR |
55 | |
56 | /* the block size for which the guest device expects atomicity */ | |
57 | int guest_block_size; | |
7f0e9da6 | 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 | |
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 | ||
b5411555 KW |
129 | static char *blk_root_get_parent_desc(BdrvChild *child) |
130 | { | |
131 | BlockBackend *blk = child->opaque; | |
132 | char *dev_id; | |
133 | ||
134 | if (blk->name) { | |
135 | return g_strdup(blk->name); | |
136 | } | |
137 | ||
138 | dev_id = blk_get_attached_dev_id(blk); | |
139 | if (*dev_id) { | |
140 | return dev_id; | |
141 | } else { | |
142 | /* TODO Callback into the BB owner for something more detailed */ | |
143 | g_free(dev_id); | |
144 | return g_strdup("a block device"); | |
145 | } | |
146 | } | |
147 | ||
4c265bf9 KW |
148 | static const char *blk_root_get_name(BdrvChild *child) |
149 | { | |
150 | return blk_name(child->opaque); | |
151 | } | |
152 | ||
5f7772c4 FZ |
153 | static void blk_vm_state_changed(void *opaque, int running, RunState state) |
154 | { | |
155 | Error *local_err = NULL; | |
156 | BlockBackend *blk = opaque; | |
157 | ||
158 | if (state == RUN_STATE_INMIGRATE) { | |
159 | return; | |
160 | } | |
161 | ||
162 | qemu_del_vm_change_state_handler(blk->vmsh); | |
163 | blk->vmsh = NULL; | |
164 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
165 | if (local_err) { | |
166 | error_report_err(local_err); | |
167 | } | |
168 | } | |
169 | ||
4417ab7a KW |
170 | /* |
171 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
172 | * devices can tighten their permissions in response (specifically revoke | |
173 | * shared write permissions that we needed for storage migration). | |
174 | * | |
175 | * If an error is returned, the VM cannot be allowed to be resumed. | |
176 | */ | |
177 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
178 | { | |
179 | BlockBackend *blk = child->opaque; | |
180 | Error *local_err = NULL; | |
181 | ||
182 | if (!blk->disable_perm) { | |
183 | return; | |
184 | } | |
185 | ||
186 | blk->disable_perm = false; | |
187 | ||
5f7772c4 FZ |
188 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
189 | if (local_err) { | |
190 | error_propagate(errp, local_err); | |
191 | blk->disable_perm = true; | |
192 | return; | |
193 | } | |
194 | ||
195 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
196 | /* Activation can happen when migration process is still active, for | |
197 | * example when nbd_server_add is called during non-shared storage | |
198 | * migration. Defer the shared_perm update to migration completion. */ | |
199 | if (!blk->vmsh) { | |
200 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
201 | blk); | |
202 | } | |
203 | return; | |
204 | } | |
205 | ||
4417ab7a KW |
206 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
207 | if (local_err) { | |
208 | error_propagate(errp, local_err); | |
209 | blk->disable_perm = true; | |
210 | return; | |
211 | } | |
212 | } | |
213 | ||
ca2e2144 FZ |
214 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
215 | { | |
216 | blk->force_allow_inactivate = true; | |
217 | } | |
218 | ||
c16de8f5 FZ |
219 | static bool blk_can_inactivate(BlockBackend *blk) |
220 | { | |
ca2e2144 | 221 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
222 | if (blk->dev || blk_name(blk)[0]) { |
223 | return true; | |
224 | } | |
225 | ||
ca2e2144 FZ |
226 | /* Inactivating means no more writes to the image can be done, |
227 | * even if those writes would be changes invisible to the | |
228 | * guest. For block job BBs that satisfy this, we can just allow | |
229 | * it. This is the case for mirror job source, which is required | |
230 | * by libvirt non-shared block migration. */ | |
231 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
232 | return true; | |
233 | } | |
234 | ||
235 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
236 | } |
237 | ||
cfa1a572 KW |
238 | static int blk_root_inactivate(BdrvChild *child) |
239 | { | |
240 | BlockBackend *blk = child->opaque; | |
241 | ||
242 | if (blk->disable_perm) { | |
243 | return 0; | |
244 | } | |
245 | ||
c16de8f5 | 246 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
247 | return -EPERM; |
248 | } | |
249 | ||
250 | blk->disable_perm = true; | |
251 | if (blk->root) { | |
252 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
d03654ea SH |
258 | static void blk_root_attach(BdrvChild *child) |
259 | { | |
260 | BlockBackend *blk = child->opaque; | |
261 | BlockBackendAioNotifier *notifier; | |
262 | ||
263 | trace_blk_root_attach(child, blk, child->bs); | |
264 | ||
265 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
266 | bdrv_add_aio_context_notifier(child->bs, | |
267 | notifier->attached_aio_context, | |
268 | notifier->detach_aio_context, | |
269 | notifier->opaque); | |
270 | } | |
271 | } | |
272 | ||
273 | static void blk_root_detach(BdrvChild *child) | |
274 | { | |
275 | BlockBackend *blk = child->opaque; | |
276 | BlockBackendAioNotifier *notifier; | |
277 | ||
278 | trace_blk_root_detach(child, blk, child->bs); | |
279 | ||
280 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
281 | bdrv_remove_aio_context_notifier(child->bs, | |
282 | notifier->attached_aio_context, | |
283 | notifier->detach_aio_context, | |
284 | notifier->opaque); | |
285 | } | |
286 | } | |
287 | ||
f21d96d0 | 288 | static const BdrvChildRole child_root = { |
c2066af0 KW |
289 | .inherit_options = blk_root_inherit_options, |
290 | ||
5c8cab48 KW |
291 | .change_media = blk_root_change_media, |
292 | .resize = blk_root_resize, | |
4c265bf9 | 293 | .get_name = blk_root_get_name, |
b5411555 | 294 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 295 | |
c2066af0 | 296 | .drained_begin = blk_root_drained_begin, |
fe5258a5 | 297 | .drained_poll = blk_root_drained_poll, |
c2066af0 | 298 | .drained_end = blk_root_drained_end, |
4417ab7a KW |
299 | |
300 | .activate = blk_root_activate, | |
cfa1a572 | 301 | .inactivate = blk_root_inactivate, |
d03654ea SH |
302 | |
303 | .attach = blk_root_attach, | |
304 | .detach = blk_root_detach, | |
f21d96d0 KW |
305 | }; |
306 | ||
26f54e9a | 307 | /* |
efaa7c4e | 308 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
309 | * |
310 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
311 | * to request for a block driver node that is attached to this BlockBackend. | |
312 | * @shared_perm is a bitmask which describes which permissions may be granted | |
313 | * to other users of the attached node. | |
314 | * Both sets of permissions can be changed later using blk_set_perm(). | |
315 | * | |
26f54e9a MA |
316 | * Return the new BlockBackend on success, null on failure. |
317 | */ | |
6d0eb64d | 318 | BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
319 | { |
320 | BlockBackend *blk; | |
321 | ||
26f54e9a | 322 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 323 | blk->refcnt = 1; |
6d0eb64d KW |
324 | blk->perm = perm; |
325 | blk->shared_perm = shared_perm; | |
0c3169df KW |
326 | blk_set_enable_write_cache(blk, true); |
327 | ||
cb53460b KW |
328 | blk->on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
329 | blk->on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; | |
330 | ||
9caa6f3d | 331 | block_acct_init(&blk->stats); |
27ccdd52 | 332 | |
3301f6c6 HR |
333 | notifier_list_init(&blk->remove_bs_notifiers); |
334 | notifier_list_init(&blk->insert_bs_notifiers); | |
d03654ea | 335 | QLIST_INIT(&blk->aio_notifiers); |
27ccdd52 | 336 | |
2cf22d6a | 337 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
338 | return blk; |
339 | } | |
340 | ||
7e7d56d9 | 341 | /* |
28eb9b12 | 342 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
343 | * |
344 | * Just as with bdrv_open(), after having called this function the reference to | |
345 | * @options belongs to the block layer (even on failure). | |
346 | * | |
347 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
348 | * BDS tree just by specifying the @options QDict (or @reference, | |
349 | * alternatively). At the time of adding this function, this is not possible, | |
350 | * though, so callers of this function have to be able to specify @filename and | |
351 | * @flags. | |
352 | */ | |
efaa7c4e HR |
353 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
354 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
355 | { |
356 | BlockBackend *blk; | |
28eb9b12 | 357 | BlockDriverState *bs; |
1f4ad7d3 | 358 | uint64_t perm = 0; |
c62d32f5 KW |
359 | |
360 | /* blk_new_open() is mainly used in .bdrv_create implementations and the | |
361 | * tools where sharing isn't a concern because the BDS stays private, so we | |
362 | * just request permission according to the flags. | |
363 | * | |
364 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
365 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
366 | * shouldn't hurt either. We can still share everything here because the | |
367 | * guest devices will add their own blockers if they can't share. */ | |
1f4ad7d3 KW |
368 | if ((flags & BDRV_O_NO_IO) == 0) { |
369 | perm |= BLK_PERM_CONSISTENT_READ; | |
370 | if (flags & BDRV_O_RDWR) { | |
371 | perm |= BLK_PERM_WRITE; | |
372 | } | |
c62d32f5 KW |
373 | } |
374 | if (flags & BDRV_O_RESIZE) { | |
375 | perm |= BLK_PERM_RESIZE; | |
376 | } | |
ca49a4fd | 377 | |
c62d32f5 | 378 | blk = blk_new(perm, BLK_PERM_ALL); |
5b363937 HR |
379 | bs = bdrv_open(filename, reference, options, flags, errp); |
380 | if (!bs) { | |
ca49a4fd HR |
381 | blk_unref(blk); |
382 | return NULL; | |
383 | } | |
384 | ||
d5e6f437 | 385 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
50bfbe93 FZ |
386 | perm, BLK_PERM_ALL, blk, errp); |
387 | if (!blk->root) { | |
388 | bdrv_unref(bs); | |
389 | blk_unref(blk); | |
390 | return NULL; | |
391 | } | |
72e775c7 | 392 | |
ca49a4fd HR |
393 | return blk; |
394 | } | |
395 | ||
26f54e9a MA |
396 | static void blk_delete(BlockBackend *blk) |
397 | { | |
398 | assert(!blk->refcnt); | |
e5e78550 | 399 | assert(!blk->name); |
a7f53e26 | 400 | assert(!blk->dev); |
022cdc9f | 401 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
402 | blk_io_limits_disable(blk); |
403 | } | |
f21d96d0 | 404 | if (blk->root) { |
13855c6b | 405 | blk_remove_bs(blk); |
7e7d56d9 | 406 | } |
5f7772c4 FZ |
407 | if (blk->vmsh) { |
408 | qemu_del_vm_change_state_handler(blk->vmsh); | |
409 | blk->vmsh = NULL; | |
410 | } | |
3301f6c6 HR |
411 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
412 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
d03654ea | 413 | assert(QLIST_EMPTY(&blk->aio_notifiers)); |
2cf22d6a | 414 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 415 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 416 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
417 | g_free(blk); |
418 | } | |
419 | ||
8fb3c76c MA |
420 | static void drive_info_del(DriveInfo *dinfo) |
421 | { | |
422 | if (!dinfo) { | |
423 | return; | |
424 | } | |
425 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
426 | g_free(dinfo); |
427 | } | |
428 | ||
f636ae85 AG |
429 | int blk_get_refcnt(BlockBackend *blk) |
430 | { | |
431 | return blk ? blk->refcnt : 0; | |
432 | } | |
433 | ||
26f54e9a MA |
434 | /* |
435 | * Increment @blk's reference count. | |
436 | * @blk must not be null. | |
437 | */ | |
438 | void blk_ref(BlockBackend *blk) | |
439 | { | |
5ca9d21b | 440 | assert(blk->refcnt > 0); |
26f54e9a MA |
441 | blk->refcnt++; |
442 | } | |
443 | ||
444 | /* | |
445 | * Decrement @blk's reference count. | |
446 | * If this drops it to zero, destroy @blk. | |
447 | * For convenience, do nothing if @blk is null. | |
448 | */ | |
449 | void blk_unref(BlockBackend *blk) | |
450 | { | |
451 | if (blk) { | |
452 | assert(blk->refcnt > 0); | |
5ca9d21b KW |
453 | if (blk->refcnt > 1) { |
454 | blk->refcnt--; | |
455 | } else { | |
456 | blk_drain(blk); | |
457 | /* blk_drain() cannot resurrect blk, nobody held a reference */ | |
458 | assert(blk->refcnt == 1); | |
459 | blk->refcnt = 0; | |
26f54e9a MA |
460 | blk_delete(blk); |
461 | } | |
462 | } | |
463 | } | |
464 | ||
2cf22d6a HR |
465 | /* |
466 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
467 | * ones which are hidden (i.e. are not referenced by the monitor). | |
468 | */ | |
a429b9b5 | 469 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a HR |
470 | { |
471 | return blk ? QTAILQ_NEXT(blk, link) | |
472 | : QTAILQ_FIRST(&block_backends); | |
473 | } | |
474 | ||
d8da3cef HR |
475 | void blk_remove_all_bs(void) |
476 | { | |
74d1b8fc | 477 | BlockBackend *blk = NULL; |
d8da3cef | 478 | |
2cf22d6a | 479 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
480 | AioContext *ctx = blk_get_aio_context(blk); |
481 | ||
482 | aio_context_acquire(ctx); | |
f21d96d0 | 483 | if (blk->root) { |
d8da3cef HR |
484 | blk_remove_bs(blk); |
485 | } | |
486 | aio_context_release(ctx); | |
487 | } | |
488 | } | |
489 | ||
26f54e9a | 490 | /* |
9492b0b9 | 491 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
492 | * If @blk is null, return the first one. |
493 | * Else, return @blk's next sibling, which may be null. | |
494 | * | |
495 | * To iterate over all BlockBackends, do | |
496 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
497 | * ... | |
498 | * } | |
499 | */ | |
500 | BlockBackend *blk_next(BlockBackend *blk) | |
501 | { | |
9492b0b9 HR |
502 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
503 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
504 | } |
505 | ||
7c8eece4 KW |
506 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
507 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 508 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 509 | { |
5e003f17 HR |
510 | BlockDriverState *bs, *old_bs; |
511 | ||
512 | /* Must be called from the main loop */ | |
513 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 514 | |
7c8eece4 KW |
515 | /* First, return all root nodes of BlockBackends. In order to avoid |
516 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
517 | * if the BB is the first one in the parent list of the BDS. */ | |
518 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
519 | BlockBackend *old_blk = it->blk; |
520 | ||
521 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
522 | ||
7c8eece4 KW |
523 | do { |
524 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
525 | bs = it->blk ? blk_bs(it->blk) : NULL; |
526 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 527 | |
5e003f17 HR |
528 | if (it->blk) { |
529 | blk_ref(it->blk); | |
530 | } | |
531 | blk_unref(old_blk); | |
532 | ||
88be7b4b | 533 | if (bs) { |
5e003f17 HR |
534 | bdrv_ref(bs); |
535 | bdrv_unref(old_bs); | |
88be7b4b | 536 | return bs; |
7c8eece4 KW |
537 | } |
538 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
539 | } else { |
540 | old_bs = it->bs; | |
7c8eece4 KW |
541 | } |
542 | ||
543 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
544 | * BDSes that are attached to a BlockBackend here; they have been handled | |
545 | * by the above block already */ | |
981f4f57 | 546 | do { |
7c8eece4 | 547 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
548 | bs = it->bs; |
549 | } while (bs && bdrv_has_blk(bs)); | |
550 | ||
5e003f17 HR |
551 | if (bs) { |
552 | bdrv_ref(bs); | |
553 | } | |
554 | bdrv_unref(old_bs); | |
555 | ||
88be7b4b KW |
556 | return bs; |
557 | } | |
558 | ||
5e003f17 | 559 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
560 | { |
561 | *it = (BdrvNextIterator) { | |
562 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
563 | }; | |
5e003f17 | 564 | } |
981f4f57 | 565 | |
5e003f17 HR |
566 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
567 | { | |
568 | bdrv_next_reset(it); | |
88be7b4b | 569 | return bdrv_next(it); |
981f4f57 HR |
570 | } |
571 | ||
5e003f17 HR |
572 | /* Must be called when aborting a bdrv_next() iteration before |
573 | * bdrv_next() returns NULL */ | |
574 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
575 | { | |
576 | /* Must be called from the main loop */ | |
577 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
578 | ||
579 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
580 | if (it->blk) { | |
581 | bdrv_unref(blk_bs(it->blk)); | |
582 | blk_unref(it->blk); | |
583 | } | |
584 | } else { | |
585 | bdrv_unref(it->bs); | |
586 | } | |
587 | ||
588 | bdrv_next_reset(it); | |
589 | } | |
590 | ||
e5e78550 HR |
591 | /* |
592 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
593 | * the given @name acting as the handle for the monitor. | |
594 | * Strictly for use by blockdev.c. | |
595 | * | |
596 | * @name must not be null or empty. | |
597 | * | |
598 | * Returns true on success and false on failure. In the latter case, an Error | |
599 | * object is returned through @errp. | |
600 | */ | |
601 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
602 | { | |
603 | assert(!blk->name); | |
604 | assert(name && name[0]); | |
605 | ||
606 | if (!id_wellformed(name)) { | |
607 | error_setg(errp, "Invalid device name"); | |
608 | return false; | |
609 | } | |
610 | if (blk_by_name(name)) { | |
611 | error_setg(errp, "Device with id '%s' already exists", name); | |
612 | return false; | |
613 | } | |
614 | if (bdrv_find_node(name)) { | |
615 | error_setg(errp, | |
616 | "Device name '%s' conflicts with an existing node name", | |
617 | name); | |
618 | return false; | |
619 | } | |
620 | ||
621 | blk->name = g_strdup(name); | |
622 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
623 | return true; | |
624 | } | |
625 | ||
626 | /* | |
627 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
628 | * Strictly for use by blockdev.c. | |
629 | */ | |
630 | void monitor_remove_blk(BlockBackend *blk) | |
631 | { | |
632 | if (!blk->name) { | |
633 | return; | |
634 | } | |
635 | ||
636 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
637 | g_free(blk->name); | |
638 | blk->name = NULL; | |
639 | } | |
640 | ||
26f54e9a | 641 | /* |
7e7d56d9 | 642 | * Return @blk's name, a non-null string. |
e5e78550 | 643 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 644 | */ |
0731a50f | 645 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 646 | { |
e5e78550 | 647 | return blk->name ?: ""; |
26f54e9a MA |
648 | } |
649 | ||
650 | /* | |
651 | * Return the BlockBackend with name @name if it exists, else null. | |
652 | * @name must not be null. | |
653 | */ | |
654 | BlockBackend *blk_by_name(const char *name) | |
655 | { | |
74d1b8fc | 656 | BlockBackend *blk = NULL; |
26f54e9a MA |
657 | |
658 | assert(name); | |
74d1b8fc | 659 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
660 | if (!strcmp(name, blk->name)) { |
661 | return blk; | |
662 | } | |
663 | } | |
664 | return NULL; | |
665 | } | |
7e7d56d9 MA |
666 | |
667 | /* | |
668 | * Return the BlockDriverState attached to @blk if any, else null. | |
669 | */ | |
670 | BlockDriverState *blk_bs(BlockBackend *blk) | |
671 | { | |
f21d96d0 | 672 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
673 | } |
674 | ||
7c8eece4 | 675 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
676 | { |
677 | BdrvChild *child; | |
678 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
679 | if (child->role == &child_root) { | |
7c8eece4 | 680 | return child->opaque; |
dde33812 KW |
681 | } |
682 | } | |
683 | ||
7c8eece4 KW |
684 | return NULL; |
685 | } | |
686 | ||
687 | /* | |
688 | * Returns true if @bs has an associated BlockBackend. | |
689 | */ | |
690 | bool bdrv_has_blk(BlockDriverState *bs) | |
691 | { | |
692 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
693 | } |
694 | ||
b6c1bae5 KW |
695 | /* |
696 | * Returns true if @bs has only BlockBackends as parents. | |
697 | */ | |
698 | bool bdrv_is_root_node(BlockDriverState *bs) | |
699 | { | |
700 | BdrvChild *c; | |
701 | ||
702 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
703 | if (c->role != &child_root) { | |
704 | return false; | |
705 | } | |
706 | } | |
707 | ||
708 | return true; | |
709 | } | |
710 | ||
18e46a03 MA |
711 | /* |
712 | * Return @blk's DriveInfo if any, else null. | |
713 | */ | |
714 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
715 | { | |
716 | return blk->legacy_dinfo; | |
717 | } | |
718 | ||
719 | /* | |
720 | * Set @blk's DriveInfo to @dinfo, and return it. | |
721 | * @blk must not have a DriveInfo set already. | |
722 | * No other BlockBackend may have the same DriveInfo set. | |
723 | */ | |
724 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
725 | { | |
726 | assert(!blk->legacy_dinfo); | |
727 | return blk->legacy_dinfo = dinfo; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Return the BlockBackend with DriveInfo @dinfo. | |
732 | * It must exist. | |
733 | */ | |
734 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
735 | { | |
74d1b8fc | 736 | BlockBackend *blk = NULL; |
18e46a03 | 737 | |
74d1b8fc | 738 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
739 | if (blk->legacy_dinfo == dinfo) { |
740 | return blk; | |
741 | } | |
742 | } | |
743 | abort(); | |
744 | } | |
745 | ||
f2cd875d KW |
746 | /* |
747 | * Returns a pointer to the publicly accessible fields of @blk. | |
748 | */ | |
749 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
750 | { | |
751 | return &blk->public; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Returns a BlockBackend given the associated @public fields. | |
756 | */ | |
757 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
758 | { | |
759 | return container_of(public, BlockBackend, public); | |
760 | } | |
761 | ||
1c95f7e1 HR |
762 | /* |
763 | * Disassociates the currently associated BlockDriverState from @blk. | |
764 | */ | |
765 | void blk_remove_bs(BlockBackend *blk) | |
766 | { | |
c89bcf3a | 767 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
632a7735 | 768 | BlockDriverState *bs; |
022cdc9f | 769 | |
3301f6c6 | 770 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 771 | if (tgm->throttle_state) { |
632a7735 ZL |
772 | bs = blk_bs(blk); |
773 | bdrv_drained_begin(bs); | |
c89bcf3a AG |
774 | throttle_group_detach_aio_context(tgm); |
775 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 776 | bdrv_drained_end(bs); |
a5614993 | 777 | } |
1c95f7e1 | 778 | |
7ca7f0f6 KW |
779 | blk_update_root_state(blk); |
780 | ||
f45280cb GK |
781 | /* bdrv_root_unref_child() will cause blk->root to become stale and may |
782 | * switch to a completion coroutine later on. Let's drain all I/O here | |
783 | * to avoid that and a potential QEMU crash. | |
784 | */ | |
785 | blk_drain(blk); | |
f21d96d0 KW |
786 | bdrv_root_unref_child(blk->root); |
787 | blk->root = NULL; | |
1c95f7e1 HR |
788 | } |
789 | ||
0c3c36d6 HR |
790 | /* |
791 | * Associates a new BlockDriverState with @blk. | |
792 | */ | |
d7086422 | 793 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 794 | { |
c89bcf3a | 795 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
d5e6f437 | 796 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
d7086422 KW |
797 | blk->perm, blk->shared_perm, blk, errp); |
798 | if (blk->root == NULL) { | |
799 | return -EPERM; | |
800 | } | |
801 | bdrv_ref(bs); | |
3301f6c6 HR |
802 | |
803 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
804 | if (tgm->throttle_state) { |
805 | throttle_group_detach_aio_context(tgm); | |
806 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 807 | } |
d7086422 KW |
808 | |
809 | return 0; | |
0c3c36d6 HR |
810 | } |
811 | ||
981776b3 KW |
812 | /* |
813 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
814 | */ | |
815 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
816 | Error **errp) | |
817 | { | |
818 | int ret; | |
819 | ||
d35ff5e6 | 820 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
821 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
822 | if (ret < 0) { | |
823 | return ret; | |
824 | } | |
825 | } | |
826 | ||
827 | blk->perm = perm; | |
828 | blk->shared_perm = shared_perm; | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
887354bd KW |
833 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
834 | { | |
835 | *perm = blk->perm; | |
836 | *shared_perm = blk->shared_perm; | |
837 | } | |
838 | ||
bbc8ea98 | 839 | static int blk_do_attach_dev(BlockBackend *blk, void *dev) |
4be74634 | 840 | { |
a7f53e26 MA |
841 | if (blk->dev) { |
842 | return -EBUSY; | |
843 | } | |
d35ff5e6 KW |
844 | |
845 | /* While migration is still incoming, we don't need to apply the | |
846 | * permissions of guest device BlockBackends. We might still have a block | |
847 | * job or NBD server writing to the image for storage migration. */ | |
848 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
849 | blk->disable_perm = true; | |
850 | } | |
851 | ||
84ebe375 | 852 | blk_ref(blk); |
a7f53e26 | 853 | blk->dev = dev; |
bbc8ea98 | 854 | blk->legacy_dev = false; |
373340b2 | 855 | blk_iostatus_reset(blk); |
d35ff5e6 | 856 | |
a7f53e26 | 857 | return 0; |
4be74634 MA |
858 | } |
859 | ||
bbc8ea98 KW |
860 | /* |
861 | * Attach device model @dev to @blk. | |
862 | * Return 0 on success, -EBUSY when a device model is attached already. | |
863 | */ | |
864 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
865 | { | |
866 | return blk_do_attach_dev(blk, dev); | |
867 | } | |
868 | ||
a7f53e26 MA |
869 | /* |
870 | * Attach device model @dev to @blk. | |
871 | * @blk must not have a device model attached already. | |
872 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
873 | */ | |
bbc8ea98 | 874 | void blk_attach_dev_legacy(BlockBackend *blk, void *dev) |
4be74634 | 875 | { |
bbc8ea98 | 876 | if (blk_do_attach_dev(blk, dev) < 0) { |
a7f53e26 MA |
877 | abort(); |
878 | } | |
bbc8ea98 | 879 | blk->legacy_dev = true; |
4be74634 MA |
880 | } |
881 | ||
a7f53e26 MA |
882 | /* |
883 | * Detach device model @dev from @blk. | |
884 | * @dev must be currently attached to @blk. | |
885 | */ | |
4be74634 | 886 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 887 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 888 | { |
a7f53e26 MA |
889 | assert(blk->dev == dev); |
890 | blk->dev = NULL; | |
891 | blk->dev_ops = NULL; | |
892 | blk->dev_opaque = NULL; | |
68e9ec01 | 893 | blk->guest_block_size = 512; |
981776b3 | 894 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 895 | blk_unref(blk); |
4be74634 MA |
896 | } |
897 | ||
a7f53e26 MA |
898 | /* |
899 | * Return the device model attached to @blk if any, else null. | |
900 | */ | |
4be74634 | 901 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
902 | /* TODO change to return DeviceState * when all users are qdevified */ |
903 | { | |
904 | return blk->dev; | |
905 | } | |
906 | ||
2d76e724 KW |
907 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
908 | * device attached to the BlockBackend. */ | |
77beef83 | 909 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 KW |
910 | { |
911 | DeviceState *dev; | |
912 | ||
913 | assert(!blk->legacy_dev); | |
914 | dev = blk->dev; | |
915 | ||
916 | if (!dev) { | |
917 | return g_strdup(""); | |
918 | } else if (dev->id) { | |
919 | return g_strdup(dev->id); | |
920 | } | |
602414d1 LM |
921 | |
922 | return object_get_canonical_path(OBJECT(dev)) ?: g_strdup(""); | |
2d76e724 KW |
923 | } |
924 | ||
1c89e1fa KW |
925 | /* |
926 | * Return the BlockBackend which has the device model @dev attached if it | |
927 | * exists, else null. | |
928 | * | |
929 | * @dev must not be null. | |
930 | */ | |
931 | BlockBackend *blk_by_dev(void *dev) | |
932 | { | |
933 | BlockBackend *blk = NULL; | |
934 | ||
935 | assert(dev != NULL); | |
936 | while ((blk = blk_all_next(blk)) != NULL) { | |
937 | if (blk->dev == dev) { | |
938 | return blk; | |
939 | } | |
940 | } | |
941 | return NULL; | |
942 | } | |
943 | ||
a7f53e26 MA |
944 | /* |
945 | * Set @blk's device model callbacks to @ops. | |
946 | * @opaque is the opaque argument to pass to the callbacks. | |
947 | * This is for use by device models. | |
948 | */ | |
949 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
950 | void *opaque) | |
951 | { | |
bbc8ea98 | 952 | /* All drivers that use blk_set_dev_ops() are qdevified and we want to keep |
f4d9cc88 JS |
953 | * it that way, so we can assume blk->dev, if present, is a DeviceState if |
954 | * blk->dev_ops is set. Non-device users may use dev_ops without device. */ | |
bbc8ea98 KW |
955 | assert(!blk->legacy_dev); |
956 | ||
a7f53e26 MA |
957 | blk->dev_ops = ops; |
958 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
959 | |
960 | /* Are we currently quiesced? Should we enforce this right now? */ | |
961 | if (blk->quiesce_counter && ops->drained_begin) { | |
962 | ops->drained_begin(opaque); | |
963 | } | |
a7f53e26 MA |
964 | } |
965 | ||
966 | /* | |
967 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
968 | * |
969 | * If @load is true, notify of media load. This action can fail, meaning that | |
970 | * the medium cannot be loaded. @errp is set then. | |
971 | * | |
972 | * If @load is false, notify of media eject. This can never fail. | |
973 | * | |
a7f53e26 MA |
974 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
975 | */ | |
39829a01 | 976 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 MA |
977 | { |
978 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 979 | bool tray_was_open, tray_is_open; |
39829a01 | 980 | Error *local_err = NULL; |
a7f53e26 | 981 | |
2d76e724 KW |
982 | assert(!blk->legacy_dev); |
983 | ||
f1f57066 | 984 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
985 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
986 | if (local_err) { | |
987 | assert(load == true); | |
988 | error_propagate(errp, local_err); | |
989 | return; | |
990 | } | |
f1f57066 HR |
991 | tray_is_open = blk_dev_is_tray_open(blk); |
992 | ||
993 | if (tray_was_open != tray_is_open) { | |
2d76e724 | 994 | char *id = blk_get_attached_dev_id(blk); |
3ab72385 | 995 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open); |
2d76e724 | 996 | g_free(id); |
a7f53e26 MA |
997 | } |
998 | } | |
999 | } | |
1000 | ||
5c8cab48 KW |
1001 | static void blk_root_change_media(BdrvChild *child, bool load) |
1002 | { | |
39829a01 | 1003 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
1004 | } |
1005 | ||
a7f53e26 MA |
1006 | /* |
1007 | * Does @blk's attached device model have removable media? | |
1008 | * %true if no device model is attached. | |
1009 | */ | |
1010 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
1011 | { | |
1012 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
1013 | } | |
1014 | ||
8f3a73bc HR |
1015 | /* |
1016 | * Does @blk's attached device model have a tray? | |
1017 | */ | |
1018 | bool blk_dev_has_tray(BlockBackend *blk) | |
1019 | { | |
1020 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
1021 | } | |
1022 | ||
a7f53e26 MA |
1023 | /* |
1024 | * Notify @blk's attached device model of a media eject request. | |
1025 | * If @force is true, the medium is about to be yanked out forcefully. | |
1026 | */ | |
1027 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 1028 | { |
a7f53e26 MA |
1029 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
1030 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
1031 | } | |
4be74634 MA |
1032 | } |
1033 | ||
a7f53e26 MA |
1034 | /* |
1035 | * Does @blk's attached device model have a tray, and is it open? | |
1036 | */ | |
1037 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 1038 | { |
8f3a73bc | 1039 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
1040 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
1041 | } | |
1042 | return false; | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * Does @blk's attached device model have the medium locked? | |
1047 | * %false if the device model has no such lock. | |
1048 | */ | |
1049 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
1050 | { | |
1051 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
1052 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
1053 | } | |
1054 | return false; | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Notify @blk's attached device model of a backend size change. | |
1059 | */ | |
5c8cab48 | 1060 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 1061 | { |
5c8cab48 KW |
1062 | BlockBackend *blk = child->opaque; |
1063 | ||
a7f53e26 MA |
1064 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
1065 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | void blk_iostatus_enable(BlockBackend *blk) | |
1070 | { | |
373340b2 HR |
1071 | blk->iostatus_enabled = true; |
1072 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1073 | } | |
1074 | ||
1075 | /* The I/O status is only enabled if the drive explicitly | |
1076 | * enables it _and_ the VM is configured to stop on errors */ | |
1077 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1078 | { | |
1079 | return (blk->iostatus_enabled && | |
1080 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1081 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1082 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1083 | } | |
1084 | ||
1085 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1086 | { | |
1087 | return blk->iostatus; | |
1088 | } | |
1089 | ||
1090 | void blk_iostatus_disable(BlockBackend *blk) | |
1091 | { | |
1092 | blk->iostatus_enabled = false; | |
1093 | } | |
1094 | ||
1095 | void blk_iostatus_reset(BlockBackend *blk) | |
1096 | { | |
1097 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 1098 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 1099 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
1100 | if (bs && bs->job) { |
1101 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
1102 | } |
1103 | } | |
1104 | } | |
1105 | ||
1106 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1107 | { | |
1108 | assert(blk_iostatus_is_enabled(blk)); | |
1109 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1110 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1111 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1112 | } | |
4be74634 MA |
1113 | } |
1114 | ||
c10c9d96 KW |
1115 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1116 | { | |
1117 | blk->allow_write_beyond_eof = allow; | |
1118 | } | |
1119 | ||
e7f7d676 HR |
1120 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
1121 | size_t size) | |
1122 | { | |
1123 | int64_t len; | |
1124 | ||
1125 | if (size > INT_MAX) { | |
1126 | return -EIO; | |
1127 | } | |
1128 | ||
c09ba36c | 1129 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
1130 | return -ENOMEDIUM; |
1131 | } | |
1132 | ||
e7f7d676 HR |
1133 | if (offset < 0) { |
1134 | return -EIO; | |
1135 | } | |
1136 | ||
c10c9d96 KW |
1137 | if (!blk->allow_write_beyond_eof) { |
1138 | len = blk_getlength(blk); | |
1139 | if (len < 0) { | |
1140 | return len; | |
1141 | } | |
1142 | ||
1143 | if (offset > len || len - offset < size) { | |
1144 | return -EIO; | |
1145 | } | |
e7f7d676 HR |
1146 | } |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | ||
1e98fefd KW |
1151 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
1152 | unsigned int bytes, QEMUIOVector *qiov, | |
1153 | BdrvRequestFlags flags) | |
4be74634 | 1154 | { |
1e98fefd | 1155 | int ret; |
99723548 | 1156 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 1157 | |
99723548 | 1158 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1159 | |
1160 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1161 | if (ret < 0) { |
1162 | return ret; | |
1163 | } | |
1164 | ||
99723548 PB |
1165 | bdrv_inc_in_flight(bs); |
1166 | ||
441565b2 | 1167 | /* throttling disk I/O */ |
022cdc9f MP |
1168 | if (blk->public.throttle_group_member.throttle_state) { |
1169 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1170 | bytes, false); | |
441565b2 KW |
1171 | } |
1172 | ||
99723548 PB |
1173 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
1174 | bdrv_dec_in_flight(bs); | |
1175 | return ret; | |
1bf1cbc9 KW |
1176 | } |
1177 | ||
1e98fefd KW |
1178 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
1179 | unsigned int bytes, QEMUIOVector *qiov, | |
1180 | BdrvRequestFlags flags) | |
a8823a3b | 1181 | { |
bfd18d1e | 1182 | int ret; |
99723548 | 1183 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 1184 | |
99723548 | 1185 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1186 | |
bfd18d1e | 1187 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1188 | if (ret < 0) { |
1189 | return ret; | |
1190 | } | |
1191 | ||
99723548 | 1192 | bdrv_inc_in_flight(bs); |
441565b2 | 1193 | /* throttling disk I/O */ |
022cdc9f MP |
1194 | if (blk->public.throttle_group_member.throttle_state) { |
1195 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1196 | bytes, true); | |
441565b2 KW |
1197 | } |
1198 | ||
bfd18d1e KW |
1199 | if (!blk->enable_write_cache) { |
1200 | flags |= BDRV_REQ_FUA; | |
1201 | } | |
1202 | ||
99723548 PB |
1203 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
1204 | bdrv_dec_in_flight(bs); | |
1205 | return ret; | |
a8823a3b KW |
1206 | } |
1207 | ||
1bf1cbc9 KW |
1208 | typedef struct BlkRwCo { |
1209 | BlockBackend *blk; | |
1210 | int64_t offset; | |
c060332c | 1211 | void *iobuf; |
1bf1cbc9 KW |
1212 | int ret; |
1213 | BdrvRequestFlags flags; | |
1214 | } BlkRwCo; | |
1215 | ||
1216 | static void blk_read_entry(void *opaque) | |
1217 | { | |
1218 | BlkRwCo *rwco = opaque; | |
c060332c | 1219 | QEMUIOVector *qiov = rwco->iobuf; |
1bf1cbc9 | 1220 | |
c060332c DS |
1221 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, qiov->size, |
1222 | qiov, rwco->flags); | |
1bf1cbc9 KW |
1223 | } |
1224 | ||
a8823a3b KW |
1225 | static void blk_write_entry(void *opaque) |
1226 | { | |
1227 | BlkRwCo *rwco = opaque; | |
c060332c | 1228 | QEMUIOVector *qiov = rwco->iobuf; |
a8823a3b | 1229 | |
c060332c DS |
1230 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, qiov->size, |
1231 | qiov, rwco->flags); | |
a8823a3b KW |
1232 | } |
1233 | ||
a55d3fba KW |
1234 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1235 | int64_t bytes, CoroutineEntry co_entry, | |
1236 | BdrvRequestFlags flags) | |
1bf1cbc9 | 1237 | { |
1bf1cbc9 KW |
1238 | QEMUIOVector qiov; |
1239 | struct iovec iov; | |
1bf1cbc9 KW |
1240 | BlkRwCo rwco; |
1241 | ||
1bf1cbc9 KW |
1242 | iov = (struct iovec) { |
1243 | .iov_base = buf, | |
a55d3fba | 1244 | .iov_len = bytes, |
1bf1cbc9 KW |
1245 | }; |
1246 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1247 | ||
1248 | rwco = (BlkRwCo) { | |
1249 | .blk = blk, | |
a55d3fba | 1250 | .offset = offset, |
c060332c | 1251 | .iobuf = &qiov, |
fc1453cd | 1252 | .flags = flags, |
1bf1cbc9 KW |
1253 | .ret = NOT_DONE, |
1254 | }; | |
1255 | ||
35f106e6 PB |
1256 | if (qemu_in_coroutine()) { |
1257 | /* Fast-path if already in coroutine context */ | |
1258 | co_entry(&rwco); | |
1259 | } else { | |
1260 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
e92f0e19 | 1261 | bdrv_coroutine_enter(blk_bs(blk), co); |
35f106e6 PB |
1262 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); |
1263 | } | |
1bf1cbc9 KW |
1264 | |
1265 | return rwco.ret; | |
4be74634 MA |
1266 | } |
1267 | ||
b7d17f9f EB |
1268 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1269 | int count) | |
4be74634 | 1270 | { |
5bd51196 KW |
1271 | int ret; |
1272 | ||
b7d17f9f | 1273 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1274 | if (ret < 0) { |
1275 | return ret; | |
1276 | } | |
1277 | ||
c2066af0 | 1278 | blk_root_drained_begin(blk->root); |
b7d17f9f | 1279 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 1280 | blk_root_drained_end(blk->root); |
5bd51196 | 1281 | return ret; |
4be74634 MA |
1282 | } |
1283 | ||
d004bd52 | 1284 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 1285 | int bytes, BdrvRequestFlags flags) |
0df89e8e | 1286 | { |
f5a5ca79 | 1287 | return blk_prw(blk, offset, NULL, bytes, blk_write_entry, |
983a1600 | 1288 | flags | BDRV_REQ_ZERO_WRITE); |
0df89e8e KW |
1289 | } |
1290 | ||
720ff280 KW |
1291 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1292 | { | |
1293 | return bdrv_make_zero(blk->root, flags); | |
1294 | } | |
1295 | ||
33f2a757 SH |
1296 | static void blk_inc_in_flight(BlockBackend *blk) |
1297 | { | |
1298 | atomic_inc(&blk->in_flight); | |
1299 | } | |
1300 | ||
1301 | static void blk_dec_in_flight(BlockBackend *blk) | |
1302 | { | |
1303 | atomic_dec(&blk->in_flight); | |
cfe29d82 | 1304 | aio_wait_kick(); |
33f2a757 SH |
1305 | } |
1306 | ||
e7f7d676 HR |
1307 | static void error_callback_bh(void *opaque) |
1308 | { | |
1309 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 | 1310 | |
33f2a757 | 1311 | blk_dec_in_flight(acb->blk); |
e7f7d676 HR |
1312 | acb->common.cb(acb->common.opaque, acb->ret); |
1313 | qemu_aio_unref(acb); | |
1314 | } | |
1315 | ||
ca78ecfa PL |
1316 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1317 | BlockCompletionFunc *cb, | |
1318 | void *opaque, int ret) | |
e7f7d676 HR |
1319 | { |
1320 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 1321 | |
33f2a757 | 1322 | blk_inc_in_flight(blk); |
e7f7d676 | 1323 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1324 | acb->blk = blk; |
e7f7d676 HR |
1325 | acb->ret = ret; |
1326 | ||
fffb6e12 | 1327 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
1328 | return &acb->common; |
1329 | } | |
1330 | ||
57d6a428 KW |
1331 | typedef struct BlkAioEmAIOCB { |
1332 | BlockAIOCB common; | |
1333 | BlkRwCo rwco; | |
7fa84cd8 | 1334 | int bytes; |
57d6a428 | 1335 | bool has_returned; |
57d6a428 KW |
1336 | } BlkAioEmAIOCB; |
1337 | ||
1338 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1339 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1340 | }; | |
1341 | ||
1342 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1343 | { | |
57d6a428 KW |
1344 | if (acb->has_returned) { |
1345 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
46aaf2a5 | 1346 | blk_dec_in_flight(acb->rwco.blk); |
57d6a428 KW |
1347 | qemu_aio_unref(acb); |
1348 | } | |
1349 | } | |
1350 | ||
1351 | static void blk_aio_complete_bh(void *opaque) | |
1352 | { | |
fffb6e12 | 1353 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1354 | assert(acb->has_returned); |
1355 | blk_aio_complete(acb); | |
57d6a428 KW |
1356 | } |
1357 | ||
7fa84cd8 | 1358 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
c060332c | 1359 | void *iobuf, CoroutineEntry co_entry, |
57d6a428 KW |
1360 | BdrvRequestFlags flags, |
1361 | BlockCompletionFunc *cb, void *opaque) | |
1362 | { | |
1363 | BlkAioEmAIOCB *acb; | |
1364 | Coroutine *co; | |
1365 | ||
33f2a757 | 1366 | blk_inc_in_flight(blk); |
57d6a428 KW |
1367 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1368 | acb->rwco = (BlkRwCo) { | |
1369 | .blk = blk, | |
1370 | .offset = offset, | |
c060332c | 1371 | .iobuf = iobuf, |
57d6a428 KW |
1372 | .flags = flags, |
1373 | .ret = NOT_DONE, | |
1374 | }; | |
7fa84cd8 | 1375 | acb->bytes = bytes; |
57d6a428 KW |
1376 | acb->has_returned = false; |
1377 | ||
0b8b8753 | 1378 | co = qemu_coroutine_create(co_entry, acb); |
e92f0e19 | 1379 | bdrv_coroutine_enter(blk_bs(blk), co); |
57d6a428 KW |
1380 | |
1381 | acb->has_returned = true; | |
1382 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1383 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1384 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1385 | } |
1386 | ||
1387 | return &acb->common; | |
1388 | } | |
1389 | ||
1390 | static void blk_aio_read_entry(void *opaque) | |
1391 | { | |
1392 | BlkAioEmAIOCB *acb = opaque; | |
1393 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1394 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1395 | |
c060332c | 1396 | assert(qiov->size == acb->bytes); |
7fa84cd8 | 1397 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, |
c060332c | 1398 | qiov, rwco->flags); |
57d6a428 KW |
1399 | blk_aio_complete(acb); |
1400 | } | |
1401 | ||
1402 | static void blk_aio_write_entry(void *opaque) | |
1403 | { | |
1404 | BlkAioEmAIOCB *acb = opaque; | |
1405 | BlkRwCo *rwco = &acb->rwco; | |
c060332c | 1406 | QEMUIOVector *qiov = rwco->iobuf; |
57d6a428 | 1407 | |
c060332c | 1408 | assert(!qiov || qiov->size == acb->bytes); |
7fa84cd8 | 1409 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, |
c060332c | 1410 | qiov, rwco->flags); |
57d6a428 KW |
1411 | blk_aio_complete(acb); |
1412 | } | |
1413 | ||
d004bd52 EB |
1414 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1415 | int count, BdrvRequestFlags flags, | |
1416 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1417 | { |
983a1600 EB |
1418 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1419 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1420 | } |
1421 | ||
1422 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1423 | { | |
a55d3fba | 1424 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1425 | if (ret < 0) { |
1426 | return ret; | |
1427 | } | |
a55d3fba | 1428 | return count; |
4be74634 MA |
1429 | } |
1430 | ||
8341f00d EB |
1431 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1432 | BdrvRequestFlags flags) | |
4be74634 | 1433 | { |
8341f00d EB |
1434 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1435 | flags); | |
e7f7d676 HR |
1436 | if (ret < 0) { |
1437 | return ret; | |
1438 | } | |
a55d3fba | 1439 | return count; |
4be74634 MA |
1440 | } |
1441 | ||
1442 | int64_t blk_getlength(BlockBackend *blk) | |
1443 | { | |
c09ba36c HR |
1444 | if (!blk_is_available(blk)) { |
1445 | return -ENOMEDIUM; | |
1446 | } | |
1447 | ||
f21d96d0 | 1448 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1449 | } |
1450 | ||
1451 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1452 | { | |
f21d96d0 | 1453 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1454 | *nb_sectors_ptr = 0; |
1455 | } else { | |
f21d96d0 | 1456 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1457 | } |
4be74634 MA |
1458 | } |
1459 | ||
1ef01253 HR |
1460 | int64_t blk_nb_sectors(BlockBackend *blk) |
1461 | { | |
c09ba36c HR |
1462 | if (!blk_is_available(blk)) { |
1463 | return -ENOMEDIUM; | |
1464 | } | |
1465 | ||
f21d96d0 | 1466 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1467 | } |
1468 | ||
60cb2fa7 EB |
1469 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1470 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1471 | BlockCompletionFunc *cb, void *opaque) | |
1472 | { | |
1473 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1474 | blk_aio_read_entry, flags, cb, opaque); | |
1475 | } | |
1476 | ||
60cb2fa7 EB |
1477 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1478 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1479 | BlockCompletionFunc *cb, void *opaque) | |
1480 | { | |
1481 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1482 | blk_aio_write_entry, flags, cb, opaque); | |
1483 | } | |
1484 | ||
be07a889 KW |
1485 | static void blk_aio_flush_entry(void *opaque) |
1486 | { | |
1487 | BlkAioEmAIOCB *acb = opaque; | |
1488 | BlkRwCo *rwco = &acb->rwco; | |
1489 | ||
1490 | rwco->ret = blk_co_flush(rwco->blk); | |
1491 | blk_aio_complete(acb); | |
1492 | } | |
1493 | ||
4be74634 MA |
1494 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1495 | BlockCompletionFunc *cb, void *opaque) | |
1496 | { | |
be07a889 | 1497 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1498 | } |
1499 | ||
8c2e3dd5 KW |
1500 | static void blk_aio_pdiscard_entry(void *opaque) |
1501 | { | |
1502 | BlkAioEmAIOCB *acb = opaque; | |
1503 | BlkRwCo *rwco = &acb->rwco; | |
1504 | ||
1505 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1506 | blk_aio_complete(acb); | |
1507 | } | |
1508 | ||
1c6c4bb7 | 1509 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
f5a5ca79 | 1510 | int64_t offset, int bytes, |
1c6c4bb7 | 1511 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1512 | { |
f5a5ca79 | 1513 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
8c2e3dd5 | 1514 | cb, opaque); |
4be74634 MA |
1515 | } |
1516 | ||
1517 | void blk_aio_cancel(BlockAIOCB *acb) | |
1518 | { | |
1519 | bdrv_aio_cancel(acb); | |
1520 | } | |
1521 | ||
1522 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1523 | { | |
1524 | bdrv_aio_cancel_async(acb); | |
1525 | } | |
1526 | ||
48af776a | 1527 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1528 | { |
c09ba36c HR |
1529 | if (!blk_is_available(blk)) { |
1530 | return -ENOMEDIUM; | |
1531 | } | |
1532 | ||
48af776a KW |
1533 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1534 | } | |
1535 | ||
1536 | static void blk_ioctl_entry(void *opaque) | |
1537 | { | |
1538 | BlkRwCo *rwco = opaque; | |
c060332c DS |
1539 | QEMUIOVector *qiov = rwco->iobuf; |
1540 | ||
48af776a | 1541 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, |
c060332c | 1542 | qiov->iov[0].iov_base); |
48af776a KW |
1543 | } |
1544 | ||
1545 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1546 | { | |
1547 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1548 | } | |
1549 | ||
1550 | static void blk_aio_ioctl_entry(void *opaque) | |
1551 | { | |
1552 | BlkAioEmAIOCB *acb = opaque; | |
1553 | BlkRwCo *rwco = &acb->rwco; | |
1554 | ||
c060332c DS |
1555 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, rwco->iobuf); |
1556 | ||
48af776a | 1557 | blk_aio_complete(acb); |
4be74634 MA |
1558 | } |
1559 | ||
1560 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1561 | BlockCompletionFunc *cb, void *opaque) | |
1562 | { | |
c060332c | 1563 | return blk_aio_prwv(blk, req, 0, buf, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1564 | } |
1565 | ||
f5a5ca79 | 1566 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
2bb0dce7 | 1567 | { |
f5a5ca79 | 1568 | int ret = blk_check_byte_request(blk, offset, bytes); |
e7f7d676 HR |
1569 | if (ret < 0) { |
1570 | return ret; | |
1571 | } | |
1572 | ||
0b9fd3f4 | 1573 | return bdrv_co_pdiscard(blk->root, offset, bytes); |
2bb0dce7 HR |
1574 | } |
1575 | ||
1576 | int blk_co_flush(BlockBackend *blk) | |
1577 | { | |
c09ba36c HR |
1578 | if (!blk_is_available(blk)) { |
1579 | return -ENOMEDIUM; | |
1580 | } | |
1581 | ||
f21d96d0 | 1582 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1583 | } |
1584 | ||
be07a889 | 1585 | static void blk_flush_entry(void *opaque) |
4be74634 | 1586 | { |
be07a889 KW |
1587 | BlkRwCo *rwco = opaque; |
1588 | rwco->ret = blk_co_flush(rwco->blk); | |
1589 | } | |
c09ba36c | 1590 | |
be07a889 KW |
1591 | int blk_flush(BlockBackend *blk) |
1592 | { | |
1593 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1594 | } |
1595 | ||
97b0385a AY |
1596 | void blk_drain(BlockBackend *blk) |
1597 | { | |
33f2a757 SH |
1598 | BlockDriverState *bs = blk_bs(blk); |
1599 | ||
1600 | if (bs) { | |
1601 | bdrv_drained_begin(bs); | |
1602 | } | |
1603 | ||
1604 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 KW |
1605 | AIO_WAIT_WHILE(blk_get_aio_context(blk), |
1606 | atomic_mb_read(&blk->in_flight) > 0); | |
33f2a757 SH |
1607 | |
1608 | if (bs) { | |
1609 | bdrv_drained_end(bs); | |
a46fc9c9 | 1610 | } |
97b0385a AY |
1611 | } |
1612 | ||
4be74634 MA |
1613 | void blk_drain_all(void) |
1614 | { | |
33f2a757 SH |
1615 | BlockBackend *blk = NULL; |
1616 | ||
1617 | bdrv_drain_all_begin(); | |
1618 | ||
1619 | while ((blk = blk_all_next(blk)) != NULL) { | |
1620 | AioContext *ctx = blk_get_aio_context(blk); | |
1621 | ||
1622 | aio_context_acquire(ctx); | |
1623 | ||
1624 | /* We may have -ENOMEDIUM completions in flight */ | |
cfe29d82 | 1625 | AIO_WAIT_WHILE(ctx, atomic_mb_read(&blk->in_flight) > 0); |
33f2a757 SH |
1626 | |
1627 | aio_context_release(ctx); | |
1628 | } | |
1629 | ||
1630 | bdrv_drain_all_end(); | |
4be74634 MA |
1631 | } |
1632 | ||
373340b2 HR |
1633 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1634 | BlockdevOnError on_write_error) | |
1635 | { | |
1636 | blk->on_read_error = on_read_error; | |
1637 | blk->on_write_error = on_write_error; | |
1638 | } | |
1639 | ||
4be74634 MA |
1640 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1641 | { | |
373340b2 | 1642 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1643 | } |
1644 | ||
1645 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1646 | int error) | |
1647 | { | |
373340b2 HR |
1648 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1649 | ||
1650 | switch (on_err) { | |
1651 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1652 | return (error == ENOSPC) ? | |
1653 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1654 | case BLOCKDEV_ON_ERROR_STOP: | |
1655 | return BLOCK_ERROR_ACTION_STOP; | |
1656 | case BLOCKDEV_ON_ERROR_REPORT: | |
1657 | return BLOCK_ERROR_ACTION_REPORT; | |
1658 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1659 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1660 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1661 | default: |
1662 | abort(); | |
1663 | } | |
4be74634 MA |
1664 | } |
1665 | ||
373340b2 HR |
1666 | static void send_qmp_error_event(BlockBackend *blk, |
1667 | BlockErrorAction action, | |
1668 | bool is_read, int error) | |
1669 | { | |
1670 | IoOperationType optype; | |
bfe1a14c | 1671 | BlockDriverState *bs = blk_bs(blk); |
373340b2 HR |
1672 | |
1673 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
bfe1a14c KW |
1674 | qapi_event_send_block_io_error(blk_name(blk), !!bs, |
1675 | bs ? bdrv_get_node_name(bs) : NULL, optype, | |
2bf7e10f | 1676 | action, blk_iostatus_is_enabled(blk), |
3ab72385 | 1677 | error == ENOSPC, strerror(error)); |
373340b2 HR |
1678 | } |
1679 | ||
1680 | /* This is done by device models because, while the block layer knows | |
1681 | * about the error, it does not know whether an operation comes from | |
1682 | * the device or the block layer (from a job, for example). | |
1683 | */ | |
4be74634 MA |
1684 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1685 | bool is_read, int error) | |
1686 | { | |
373340b2 HR |
1687 | assert(error >= 0); |
1688 | ||
1689 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1690 | /* First set the iostatus, so that "info block" returns an iostatus | |
1691 | * that matches the events raised so far (an additional error iostatus | |
1692 | * is fine, but not a lost one). | |
1693 | */ | |
1694 | blk_iostatus_set_err(blk, error); | |
1695 | ||
1696 | /* Then raise the request to stop the VM and the event. | |
1697 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1698 | * it ensures that the STOP event always comes after the | |
1699 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1700 | * can observe the STOP event and do a "cont" before the STOP | |
1701 | * event is issued, the VM will not stop. In this case, vm_start() | |
1702 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1703 | */ | |
1704 | qemu_system_vmstop_request_prepare(); | |
1705 | send_qmp_error_event(blk, action, is_read, error); | |
1706 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1707 | } else { | |
1708 | send_qmp_error_event(blk, action, is_read, error); | |
1709 | } | |
4be74634 MA |
1710 | } |
1711 | ||
96710565 | 1712 | bool blk_is_read_only(BlockBackend *blk) |
4be74634 | 1713 | { |
f21d96d0 KW |
1714 | BlockDriverState *bs = blk_bs(blk); |
1715 | ||
1716 | if (bs) { | |
1717 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1718 | } else { |
1719 | return blk->root_state.read_only; | |
1720 | } | |
4be74634 MA |
1721 | } |
1722 | ||
96710565 | 1723 | bool blk_is_sg(BlockBackend *blk) |
4be74634 | 1724 | { |
f21d96d0 KW |
1725 | BlockDriverState *bs = blk_bs(blk); |
1726 | ||
1727 | if (!bs) { | |
96710565 | 1728 | return false; |
a46fc9c9 HR |
1729 | } |
1730 | ||
f21d96d0 | 1731 | return bdrv_is_sg(bs); |
4be74634 MA |
1732 | } |
1733 | ||
96710565 | 1734 | bool blk_enable_write_cache(BlockBackend *blk) |
4be74634 | 1735 | { |
bfd18d1e | 1736 | return blk->enable_write_cache; |
4be74634 MA |
1737 | } |
1738 | ||
1739 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1740 | { | |
bfd18d1e | 1741 | blk->enable_write_cache = wce; |
4be74634 MA |
1742 | } |
1743 | ||
2bb0dce7 HR |
1744 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1745 | { | |
f21d96d0 KW |
1746 | BlockDriverState *bs = blk_bs(blk); |
1747 | ||
1748 | if (!bs) { | |
c09ba36c HR |
1749 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1750 | return; | |
1751 | } | |
1752 | ||
f21d96d0 | 1753 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1754 | } |
1755 | ||
e031f750 | 1756 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1757 | { |
f21d96d0 KW |
1758 | BlockDriverState *bs = blk_bs(blk); |
1759 | ||
1760 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1761 | } |
1762 | ||
1763 | bool blk_is_available(BlockBackend *blk) | |
1764 | { | |
1765 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1766 | } |
1767 | ||
1768 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1769 | { | |
f21d96d0 KW |
1770 | BlockDriverState *bs = blk_bs(blk); |
1771 | ||
1772 | if (bs) { | |
1773 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1774 | } |
4be74634 MA |
1775 | } |
1776 | ||
1777 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1778 | { | |
f21d96d0 | 1779 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1780 | char *id; |
1781 | ||
1782 | /* blk_eject is only called by qdevified devices */ | |
1783 | assert(!blk->legacy_dev); | |
f21d96d0 KW |
1784 | |
1785 | if (bs) { | |
1786 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1787 | } |
c47ee043 JS |
1788 | |
1789 | /* Whether or not we ejected on the backend, | |
1790 | * the frontend experienced a tray event. */ | |
1791 | id = blk_get_attached_dev_id(blk); | |
1792 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
3ab72385 | 1793 | eject_flag); |
c47ee043 | 1794 | g_free(id); |
4be74634 MA |
1795 | } |
1796 | ||
1797 | int blk_get_flags(BlockBackend *blk) | |
1798 | { | |
f21d96d0 KW |
1799 | BlockDriverState *bs = blk_bs(blk); |
1800 | ||
1801 | if (bs) { | |
1802 | return bdrv_get_flags(bs); | |
061959e8 HR |
1803 | } else { |
1804 | return blk->root_state.open_flags; | |
1805 | } | |
4be74634 MA |
1806 | } |
1807 | ||
5def6b80 EB |
1808 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1809 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1810 | { |
f21d96d0 | 1811 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1812 | uint32_t max = 0; |
f21d96d0 KW |
1813 | |
1814 | if (bs) { | |
5def6b80 | 1815 | max = bs->bl.max_transfer; |
a46fc9c9 | 1816 | } |
5def6b80 | 1817 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1818 | } |
1819 | ||
648296e0 SH |
1820 | int blk_get_max_iov(BlockBackend *blk) |
1821 | { | |
f21d96d0 | 1822 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1823 | } |
1824 | ||
4be74634 MA |
1825 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1826 | { | |
68e9ec01 | 1827 | blk->guest_block_size = align; |
4be74634 MA |
1828 | } |
1829 | ||
f1c17521 PB |
1830 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1831 | { | |
f21d96d0 | 1832 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1833 | } |
1834 | ||
4be74634 MA |
1835 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1836 | { | |
f21d96d0 | 1837 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1838 | } |
1839 | ||
1840 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1841 | { | |
f21d96d0 KW |
1842 | BlockDriverState *bs = blk_bs(blk); |
1843 | ||
1844 | if (!bs) { | |
a46fc9c9 HR |
1845 | return false; |
1846 | } | |
1847 | ||
f21d96d0 | 1848 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1849 | } |
1850 | ||
1851 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1852 | { | |
f21d96d0 KW |
1853 | BlockDriverState *bs = blk_bs(blk); |
1854 | ||
1855 | if (bs) { | |
1856 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1857 | } |
4be74634 MA |
1858 | } |
1859 | ||
1860 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1861 | { | |
f21d96d0 KW |
1862 | BlockDriverState *bs = blk_bs(blk); |
1863 | ||
1864 | if (bs) { | |
1865 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1866 | } |
4be74634 MA |
1867 | } |
1868 | ||
1869 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1870 | { | |
f21d96d0 KW |
1871 | BlockDriverState *bs = blk_bs(blk); |
1872 | ||
1873 | if (bs) { | |
1874 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1875 | } |
4be74634 MA |
1876 | } |
1877 | ||
1878 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1879 | { | |
7803696d | 1880 | return bdrv_get_aio_context(blk_bs(blk)); |
4981bdec HR |
1881 | } |
1882 | ||
1883 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1884 | { | |
1885 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1886 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1887 | } |
1888 | ||
1889 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1890 | { | |
f21d96d0 | 1891 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 1892 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
f21d96d0 KW |
1893 | |
1894 | if (bs) { | |
c61791fc | 1895 | if (tgm->throttle_state) { |
dc868fb0 | 1896 | bdrv_drained_begin(bs); |
c61791fc MP |
1897 | throttle_group_detach_aio_context(tgm); |
1898 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 1899 | bdrv_drained_end(bs); |
7ca7f0f6 | 1900 | } |
f21d96d0 | 1901 | bdrv_set_aio_context(bs, new_context); |
a46fc9c9 | 1902 | } |
4be74634 MA |
1903 | } |
1904 | ||
2019ba0a HR |
1905 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1906 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1907 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1908 | { | |
d03654ea | 1909 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
1910 | BlockDriverState *bs = blk_bs(blk); |
1911 | ||
d03654ea SH |
1912 | notifier = g_new(BlockBackendAioNotifier, 1); |
1913 | notifier->attached_aio_context = attached_aio_context; | |
1914 | notifier->detach_aio_context = detach_aio_context; | |
1915 | notifier->opaque = opaque; | |
1916 | QLIST_INSERT_HEAD(&blk->aio_notifiers, notifier, list); | |
1917 | ||
f21d96d0 KW |
1918 | if (bs) { |
1919 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1920 | detach_aio_context, opaque); |
1921 | } | |
2019ba0a HR |
1922 | } |
1923 | ||
1924 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1925 | void (*attached_aio_context)(AioContext *, | |
1926 | void *), | |
1927 | void (*detach_aio_context)(void *), | |
1928 | void *opaque) | |
1929 | { | |
d03654ea | 1930 | BlockBackendAioNotifier *notifier; |
f21d96d0 KW |
1931 | BlockDriverState *bs = blk_bs(blk); |
1932 | ||
1933 | if (bs) { | |
1934 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1935 | detach_aio_context, opaque); |
1936 | } | |
d03654ea SH |
1937 | |
1938 | QLIST_FOREACH(notifier, &blk->aio_notifiers, list) { | |
1939 | if (notifier->attached_aio_context == attached_aio_context && | |
1940 | notifier->detach_aio_context == detach_aio_context && | |
1941 | notifier->opaque == opaque) { | |
1942 | QLIST_REMOVE(notifier, list); | |
1943 | g_free(notifier); | |
1944 | return; | |
1945 | } | |
1946 | } | |
1947 | ||
1948 | abort(); | |
2019ba0a HR |
1949 | } |
1950 | ||
3301f6c6 HR |
1951 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1952 | { | |
1953 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1954 | } | |
1955 | ||
1956 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1957 | { | |
1958 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1959 | } | |
1960 | ||
4be74634 MA |
1961 | void blk_io_plug(BlockBackend *blk) |
1962 | { | |
f21d96d0 KW |
1963 | BlockDriverState *bs = blk_bs(blk); |
1964 | ||
1965 | if (bs) { | |
1966 | bdrv_io_plug(bs); | |
a46fc9c9 | 1967 | } |
4be74634 MA |
1968 | } |
1969 | ||
1970 | void blk_io_unplug(BlockBackend *blk) | |
1971 | { | |
f21d96d0 KW |
1972 | BlockDriverState *bs = blk_bs(blk); |
1973 | ||
1974 | if (bs) { | |
1975 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1976 | } |
4be74634 MA |
1977 | } |
1978 | ||
1979 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1980 | { | |
7f0e9da6 | 1981 | return &blk->stats; |
4be74634 MA |
1982 | } |
1983 | ||
1984 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1985 | BlockCompletionFunc *cb, void *opaque) | |
1986 | { | |
1987 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1988 | } | |
1ef01253 | 1989 | |
d004bd52 | 1990 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 1991 | int bytes, BdrvRequestFlags flags) |
1ef01253 | 1992 | { |
f5a5ca79 | 1993 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 1994 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1995 | } |
1996 | ||
fe5c1355 PB |
1997 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1998 | int count) | |
1ef01253 | 1999 | { |
35fadca8 PB |
2000 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
2001 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
2002 | } |
2003 | ||
3a691c50 HR |
2004 | int blk_truncate(BlockBackend *blk, int64_t offset, PreallocMode prealloc, |
2005 | Error **errp) | |
1ef01253 | 2006 | { |
c09ba36c | 2007 | if (!blk_is_available(blk)) { |
ed3d2ec9 | 2008 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
2009 | return -ENOMEDIUM; |
2010 | } | |
2011 | ||
3a691c50 | 2012 | return bdrv_truncate(blk->root, offset, prealloc, errp); |
1ef01253 HR |
2013 | } |
2014 | ||
8c2e3dd5 | 2015 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 2016 | { |
8c2e3dd5 | 2017 | BlkRwCo *rwco = opaque; |
c060332c DS |
2018 | QEMUIOVector *qiov = rwco->iobuf; |
2019 | ||
2020 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, qiov->size); | |
8c2e3dd5 | 2021 | } |
e7f7d676 | 2022 | |
f5a5ca79 | 2023 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
8c2e3dd5 | 2024 | { |
f5a5ca79 | 2025 | return blk_prw(blk, offset, NULL, bytes, blk_pdiscard_entry, 0); |
1ef01253 HR |
2026 | } |
2027 | ||
2028 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
2029 | int64_t pos, int size) | |
2030 | { | |
bfd18d1e KW |
2031 | int ret; |
2032 | ||
c09ba36c HR |
2033 | if (!blk_is_available(blk)) { |
2034 | return -ENOMEDIUM; | |
2035 | } | |
2036 | ||
bfd18d1e KW |
2037 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
2038 | if (ret < 0) { | |
2039 | return ret; | |
2040 | } | |
2041 | ||
2042 | if (ret == size && !blk->enable_write_cache) { | |
2043 | ret = bdrv_flush(blk_bs(blk)); | |
2044 | } | |
2045 | ||
2046 | return ret < 0 ? ret : size; | |
1ef01253 HR |
2047 | } |
2048 | ||
2049 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
2050 | { | |
c09ba36c HR |
2051 | if (!blk_is_available(blk)) { |
2052 | return -ENOMEDIUM; | |
2053 | } | |
2054 | ||
f21d96d0 | 2055 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 2056 | } |
f0272c4d ET |
2057 | |
2058 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
2059 | { | |
c09ba36c HR |
2060 | if (!blk_is_available(blk)) { |
2061 | return -ENOMEDIUM; | |
2062 | } | |
2063 | ||
f21d96d0 | 2064 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
2065 | } |
2066 | ||
2067 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
2068 | { | |
c09ba36c HR |
2069 | if (!blk_is_available(blk)) { |
2070 | return -ENOMEDIUM; | |
2071 | } | |
2072 | ||
f21d96d0 | 2073 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 2074 | } |
281d22d8 HR |
2075 | |
2076 | /* | |
2077 | * Updates the BlockBackendRootState object with data from the currently | |
2078 | * attached BlockDriverState. | |
2079 | */ | |
2080 | void blk_update_root_state(BlockBackend *blk) | |
2081 | { | |
f21d96d0 | 2082 | assert(blk->root); |
281d22d8 | 2083 | |
f21d96d0 KW |
2084 | blk->root_state.open_flags = blk->root->bs->open_flags; |
2085 | blk->root_state.read_only = blk->root->bs->read_only; | |
2086 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
2087 | } |
2088 | ||
38cb18f5 | 2089 | /* |
b85114f8 KW |
2090 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
2091 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 2092 | */ |
b85114f8 | 2093 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 2094 | { |
b85114f8 | 2095 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
2096 | } |
2097 | ||
2098 | /* | |
2099 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
2100 | * supposed to inherit the root state. | |
2101 | */ | |
2102 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
2103 | { | |
2104 | int bs_flags; | |
2105 | ||
2106 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
2107 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
2108 | ||
2109 | return bs_flags; | |
2110 | } | |
2111 | ||
281d22d8 HR |
2112 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
2113 | { | |
2114 | return &blk->root_state; | |
2115 | } | |
1393f212 HR |
2116 | |
2117 | int blk_commit_all(void) | |
2118 | { | |
fe1a9cbc HR |
2119 | BlockBackend *blk = NULL; |
2120 | ||
2121 | while ((blk = blk_all_next(blk)) != NULL) { | |
2122 | AioContext *aio_context = blk_get_aio_context(blk); | |
2123 | ||
2124 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
2125 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
2126 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
2127 | if (ret < 0) { |
2128 | aio_context_release(aio_context); | |
2129 | return ret; | |
2130 | } | |
2131 | } | |
2132 | aio_context_release(aio_context); | |
2133 | } | |
2134 | return 0; | |
2135 | } | |
2136 | ||
97148076 KW |
2137 | |
2138 | /* throttling disk I/O limits */ | |
2139 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2140 | { | |
022cdc9f | 2141 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2142 | } |
2143 | ||
2144 | void blk_io_limits_disable(BlockBackend *blk) | |
2145 | { | |
48bf7ea8 AG |
2146 | BlockDriverState *bs = blk_bs(blk); |
2147 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2148 | assert(tgm->throttle_state); | |
2149 | if (bs) { | |
2150 | bdrv_drained_begin(bs); | |
2151 | } | |
2152 | throttle_group_unregister_tgm(tgm); | |
2153 | if (bs) { | |
2154 | bdrv_drained_end(bs); | |
2155 | } | |
97148076 KW |
2156 | } |
2157 | ||
2158 | /* should be called before blk_set_io_limits if a limit is set */ | |
2159 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2160 | { | |
022cdc9f | 2161 | assert(!blk->public.throttle_group_member.throttle_state); |
c61791fc MP |
2162 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2163 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2164 | } |
2165 | ||
2166 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2167 | { | |
2168 | /* this BB is not part of any group */ | |
022cdc9f | 2169 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2170 | return; |
2171 | } | |
2172 | ||
2173 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2174 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2175 | group)) { | |
97148076 KW |
2176 | return; |
2177 | } | |
2178 | ||
2179 | /* need to change the group this bs belong to */ | |
2180 | blk_io_limits_disable(blk); | |
2181 | blk_io_limits_enable(blk, group); | |
2182 | } | |
c2066af0 KW |
2183 | |
2184 | static void blk_root_drained_begin(BdrvChild *child) | |
2185 | { | |
2186 | BlockBackend *blk = child->opaque; | |
2187 | ||
f4d9cc88 JS |
2188 | if (++blk->quiesce_counter == 1) { |
2189 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
2190 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2191 | } | |
2192 | } | |
2193 | ||
36fe1331 KW |
2194 | /* Note that blk->root may not be accessible here yet if we are just |
2195 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2196 | ||
022cdc9f MP |
2197 | if (atomic_fetch_inc(&blk->public.throttle_group_member.io_limits_disabled) == 0) { |
2198 | throttle_group_restart_tgm(&blk->public.throttle_group_member); | |
c2066af0 KW |
2199 | } |
2200 | } | |
2201 | ||
fe5258a5 KW |
2202 | static bool blk_root_drained_poll(BdrvChild *child) |
2203 | { | |
2204 | BlockBackend *blk = child->opaque; | |
2205 | assert(blk->quiesce_counter); | |
2206 | return !!blk->in_flight; | |
2207 | } | |
2208 | ||
c2066af0 KW |
2209 | static void blk_root_drained_end(BdrvChild *child) |
2210 | { | |
2211 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 2212 | assert(blk->quiesce_counter); |
c2066af0 | 2213 | |
022cdc9f MP |
2214 | assert(blk->public.throttle_group_member.io_limits_disabled); |
2215 | atomic_dec(&blk->public.throttle_group_member.io_limits_disabled); | |
f4d9cc88 JS |
2216 | |
2217 | if (--blk->quiesce_counter == 0) { | |
2218 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
2219 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2220 | } | |
2221 | } | |
c2066af0 | 2222 | } |
23d0ba93 FZ |
2223 | |
2224 | void blk_register_buf(BlockBackend *blk, void *host, size_t size) | |
2225 | { | |
2226 | bdrv_register_buf(blk_bs(blk), host, size); | |
2227 | } | |
2228 | ||
2229 | void blk_unregister_buf(BlockBackend *blk, void *host) | |
2230 | { | |
2231 | bdrv_unregister_buf(blk_bs(blk), host); | |
2232 | } | |
b5679fa4 FZ |
2233 | |
2234 | int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, | |
2235 | BlockBackend *blk_out, int64_t off_out, | |
67b51fb9 VSO |
2236 | int bytes, BdrvRequestFlags read_flags, |
2237 | BdrvRequestFlags write_flags) | |
b5679fa4 FZ |
2238 | { |
2239 | int r; | |
2240 | r = blk_check_byte_request(blk_in, off_in, bytes); | |
2241 | if (r) { | |
2242 | return r; | |
2243 | } | |
2244 | r = blk_check_byte_request(blk_out, off_out, bytes); | |
2245 | if (r) { | |
2246 | return r; | |
2247 | } | |
2248 | return bdrv_co_copy_range(blk_in->root, off_in, | |
2249 | blk_out->root, off_out, | |
67b51fb9 | 2250 | bytes, read_flags, write_flags); |
b5679fa4 | 2251 | } |