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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" |
a7f53e26 | 20 | #include "qapi-event.h" |
f348b6d1 | 21 | #include "qemu/id.h" |
1e98fefd | 22 | #include "trace.h" |
5f7772c4 | 23 | #include "migration/misc.h" |
a7f53e26 MA |
24 | |
25 | /* Number of coroutines to reserve per attached device model */ | |
26 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 27 | |
1bf1cbc9 KW |
28 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
29 | ||
4981bdec HR |
30 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
31 | ||
26f54e9a MA |
32 | struct BlockBackend { |
33 | char *name; | |
34 | int refcnt; | |
f21d96d0 | 35 | BdrvChild *root; |
26f8b3a8 | 36 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 37 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 38 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 39 | BlockBackendPublic public; |
a7f53e26 MA |
40 | |
41 | void *dev; /* attached device model, if any */ | |
bbc8ea98 | 42 | bool legacy_dev; /* true if dev is not a DeviceState */ |
a7f53e26 MA |
43 | /* TODO change to DeviceState when all users are qdevified */ |
44 | const BlockDevOps *dev_ops; | |
45 | void *dev_opaque; | |
68e9ec01 HR |
46 | |
47 | /* the block size for which the guest device expects atomicity */ | |
48 | int guest_block_size; | |
7f0e9da6 | 49 | |
281d22d8 HR |
50 | /* If the BDS tree is removed, some of its options are stored here (which |
51 | * can be used to restore those options in the new BDS on insert) */ | |
52 | BlockBackendRootState root_state; | |
53 | ||
bfd18d1e KW |
54 | bool enable_write_cache; |
55 | ||
7f0e9da6 HR |
56 | /* I/O stats (display with "info blockstats"). */ |
57 | BlockAcctStats stats; | |
373340b2 HR |
58 | |
59 | BlockdevOnError on_read_error, on_write_error; | |
60 | bool iostatus_enabled; | |
61 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 62 | |
981776b3 KW |
63 | uint64_t perm; |
64 | uint64_t shared_perm; | |
d35ff5e6 | 65 | bool disable_perm; |
981776b3 | 66 | |
c10c9d96 KW |
67 | bool allow_write_beyond_eof; |
68 | ||
3301f6c6 | 69 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
f4d9cc88 JS |
70 | |
71 | int quiesce_counter; | |
5f7772c4 | 72 | VMChangeStateEntry *vmsh; |
ca2e2144 | 73 | bool force_allow_inactivate; |
26f54e9a MA |
74 | }; |
75 | ||
e7f7d676 HR |
76 | typedef struct BlockBackendAIOCB { |
77 | BlockAIOCB common; | |
4981bdec | 78 | BlockBackend *blk; |
e7f7d676 HR |
79 | int ret; |
80 | } BlockBackendAIOCB; | |
81 | ||
82 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 83 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
84 | .aiocb_size = sizeof(BlockBackendAIOCB), |
85 | }; | |
86 | ||
8fb3c76c | 87 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 88 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
8fb3c76c | 89 | |
2cf22d6a HR |
90 | /* All BlockBackends */ |
91 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
92 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
93 | ||
9492b0b9 HR |
94 | /* All BlockBackends referenced by the monitor and which are iterated through by |
95 | * blk_next() */ | |
96 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
97 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 98 | |
f21d96d0 KW |
99 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
100 | int parent_flags, QDict *parent_options) | |
101 | { | |
102 | /* We're not supposed to call this function for root nodes */ | |
103 | abort(); | |
104 | } | |
c2066af0 KW |
105 | static void blk_root_drained_begin(BdrvChild *child); |
106 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 | 107 | |
5c8cab48 KW |
108 | static void blk_root_change_media(BdrvChild *child, bool load); |
109 | static void blk_root_resize(BdrvChild *child); | |
110 | ||
b5411555 KW |
111 | static char *blk_root_get_parent_desc(BdrvChild *child) |
112 | { | |
113 | BlockBackend *blk = child->opaque; | |
114 | char *dev_id; | |
115 | ||
116 | if (blk->name) { | |
117 | return g_strdup(blk->name); | |
118 | } | |
119 | ||
120 | dev_id = blk_get_attached_dev_id(blk); | |
121 | if (*dev_id) { | |
122 | return dev_id; | |
123 | } else { | |
124 | /* TODO Callback into the BB owner for something more detailed */ | |
125 | g_free(dev_id); | |
126 | return g_strdup("a block device"); | |
127 | } | |
128 | } | |
129 | ||
4c265bf9 KW |
130 | static const char *blk_root_get_name(BdrvChild *child) |
131 | { | |
132 | return blk_name(child->opaque); | |
133 | } | |
134 | ||
5f7772c4 FZ |
135 | static void blk_vm_state_changed(void *opaque, int running, RunState state) |
136 | { | |
137 | Error *local_err = NULL; | |
138 | BlockBackend *blk = opaque; | |
139 | ||
140 | if (state == RUN_STATE_INMIGRATE) { | |
141 | return; | |
142 | } | |
143 | ||
144 | qemu_del_vm_change_state_handler(blk->vmsh); | |
145 | blk->vmsh = NULL; | |
146 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
147 | if (local_err) { | |
148 | error_report_err(local_err); | |
149 | } | |
150 | } | |
151 | ||
4417ab7a KW |
152 | /* |
153 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
154 | * devices can tighten their permissions in response (specifically revoke | |
155 | * shared write permissions that we needed for storage migration). | |
156 | * | |
157 | * If an error is returned, the VM cannot be allowed to be resumed. | |
158 | */ | |
159 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
160 | { | |
161 | BlockBackend *blk = child->opaque; | |
162 | Error *local_err = NULL; | |
163 | ||
164 | if (!blk->disable_perm) { | |
165 | return; | |
166 | } | |
167 | ||
168 | blk->disable_perm = false; | |
169 | ||
5f7772c4 FZ |
170 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
171 | if (local_err) { | |
172 | error_propagate(errp, local_err); | |
173 | blk->disable_perm = true; | |
174 | return; | |
175 | } | |
176 | ||
177 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
178 | /* Activation can happen when migration process is still active, for | |
179 | * example when nbd_server_add is called during non-shared storage | |
180 | * migration. Defer the shared_perm update to migration completion. */ | |
181 | if (!blk->vmsh) { | |
182 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
183 | blk); | |
184 | } | |
185 | return; | |
186 | } | |
187 | ||
4417ab7a KW |
188 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
189 | if (local_err) { | |
190 | error_propagate(errp, local_err); | |
191 | blk->disable_perm = true; | |
192 | return; | |
193 | } | |
194 | } | |
195 | ||
ca2e2144 FZ |
196 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
197 | { | |
198 | blk->force_allow_inactivate = true; | |
199 | } | |
200 | ||
c16de8f5 FZ |
201 | static bool blk_can_inactivate(BlockBackend *blk) |
202 | { | |
ca2e2144 | 203 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
204 | if (blk->dev || blk_name(blk)[0]) { |
205 | return true; | |
206 | } | |
207 | ||
ca2e2144 FZ |
208 | /* Inactivating means no more writes to the image can be done, |
209 | * even if those writes would be changes invisible to the | |
210 | * guest. For block job BBs that satisfy this, we can just allow | |
211 | * it. This is the case for mirror job source, which is required | |
212 | * by libvirt non-shared block migration. */ | |
213 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
214 | return true; | |
215 | } | |
216 | ||
217 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
218 | } |
219 | ||
cfa1a572 KW |
220 | static int blk_root_inactivate(BdrvChild *child) |
221 | { | |
222 | BlockBackend *blk = child->opaque; | |
223 | ||
224 | if (blk->disable_perm) { | |
225 | return 0; | |
226 | } | |
227 | ||
c16de8f5 | 228 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
229 | return -EPERM; |
230 | } | |
231 | ||
232 | blk->disable_perm = true; | |
233 | if (blk->root) { | |
234 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
f21d96d0 | 240 | static const BdrvChildRole child_root = { |
c2066af0 KW |
241 | .inherit_options = blk_root_inherit_options, |
242 | ||
5c8cab48 KW |
243 | .change_media = blk_root_change_media, |
244 | .resize = blk_root_resize, | |
4c265bf9 | 245 | .get_name = blk_root_get_name, |
b5411555 | 246 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 247 | |
c2066af0 KW |
248 | .drained_begin = blk_root_drained_begin, |
249 | .drained_end = blk_root_drained_end, | |
4417ab7a KW |
250 | |
251 | .activate = blk_root_activate, | |
cfa1a572 | 252 | .inactivate = blk_root_inactivate, |
f21d96d0 KW |
253 | }; |
254 | ||
26f54e9a | 255 | /* |
efaa7c4e | 256 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
257 | * |
258 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
259 | * to request for a block driver node that is attached to this BlockBackend. | |
260 | * @shared_perm is a bitmask which describes which permissions may be granted | |
261 | * to other users of the attached node. | |
262 | * Both sets of permissions can be changed later using blk_set_perm(). | |
263 | * | |
26f54e9a MA |
264 | * Return the new BlockBackend on success, null on failure. |
265 | */ | |
6d0eb64d | 266 | BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
267 | { |
268 | BlockBackend *blk; | |
269 | ||
26f54e9a | 270 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 271 | blk->refcnt = 1; |
6d0eb64d KW |
272 | blk->perm = perm; |
273 | blk->shared_perm = shared_perm; | |
0c3169df KW |
274 | blk_set_enable_write_cache(blk, true); |
275 | ||
9caa6f3d | 276 | block_acct_init(&blk->stats); |
27ccdd52 | 277 | |
3301f6c6 HR |
278 | notifier_list_init(&blk->remove_bs_notifiers); |
279 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 280 | |
2cf22d6a | 281 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
282 | return blk; |
283 | } | |
284 | ||
7e7d56d9 | 285 | /* |
28eb9b12 | 286 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
287 | * |
288 | * Just as with bdrv_open(), after having called this function the reference to | |
289 | * @options belongs to the block layer (even on failure). | |
290 | * | |
291 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
292 | * BDS tree just by specifying the @options QDict (or @reference, | |
293 | * alternatively). At the time of adding this function, this is not possible, | |
294 | * though, so callers of this function have to be able to specify @filename and | |
295 | * @flags. | |
296 | */ | |
efaa7c4e HR |
297 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
298 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
299 | { |
300 | BlockBackend *blk; | |
28eb9b12 | 301 | BlockDriverState *bs; |
1f4ad7d3 | 302 | uint64_t perm = 0; |
c62d32f5 KW |
303 | |
304 | /* blk_new_open() is mainly used in .bdrv_create implementations and the | |
305 | * tools where sharing isn't a concern because the BDS stays private, so we | |
306 | * just request permission according to the flags. | |
307 | * | |
308 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
309 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
310 | * shouldn't hurt either. We can still share everything here because the | |
311 | * guest devices will add their own blockers if they can't share. */ | |
1f4ad7d3 KW |
312 | if ((flags & BDRV_O_NO_IO) == 0) { |
313 | perm |= BLK_PERM_CONSISTENT_READ; | |
314 | if (flags & BDRV_O_RDWR) { | |
315 | perm |= BLK_PERM_WRITE; | |
316 | } | |
c62d32f5 KW |
317 | } |
318 | if (flags & BDRV_O_RESIZE) { | |
319 | perm |= BLK_PERM_RESIZE; | |
320 | } | |
ca49a4fd | 321 | |
c62d32f5 | 322 | blk = blk_new(perm, BLK_PERM_ALL); |
5b363937 HR |
323 | bs = bdrv_open(filename, reference, options, flags, errp); |
324 | if (!bs) { | |
ca49a4fd HR |
325 | blk_unref(blk); |
326 | return NULL; | |
327 | } | |
328 | ||
d5e6f437 | 329 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
50bfbe93 FZ |
330 | perm, BLK_PERM_ALL, blk, errp); |
331 | if (!blk->root) { | |
332 | bdrv_unref(bs); | |
333 | blk_unref(blk); | |
334 | return NULL; | |
335 | } | |
72e775c7 | 336 | |
ca49a4fd HR |
337 | return blk; |
338 | } | |
339 | ||
26f54e9a MA |
340 | static void blk_delete(BlockBackend *blk) |
341 | { | |
342 | assert(!blk->refcnt); | |
e5e78550 | 343 | assert(!blk->name); |
a7f53e26 | 344 | assert(!blk->dev); |
022cdc9f | 345 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
346 | blk_io_limits_disable(blk); |
347 | } | |
f21d96d0 | 348 | if (blk->root) { |
13855c6b | 349 | blk_remove_bs(blk); |
7e7d56d9 | 350 | } |
5f7772c4 FZ |
351 | if (blk->vmsh) { |
352 | qemu_del_vm_change_state_handler(blk->vmsh); | |
353 | blk->vmsh = NULL; | |
354 | } | |
3301f6c6 HR |
355 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
356 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
2cf22d6a | 357 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 358 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 359 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
360 | g_free(blk); |
361 | } | |
362 | ||
8fb3c76c MA |
363 | static void drive_info_del(DriveInfo *dinfo) |
364 | { | |
365 | if (!dinfo) { | |
366 | return; | |
367 | } | |
368 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
369 | g_free(dinfo->serial); |
370 | g_free(dinfo); | |
371 | } | |
372 | ||
f636ae85 AG |
373 | int blk_get_refcnt(BlockBackend *blk) |
374 | { | |
375 | return blk ? blk->refcnt : 0; | |
376 | } | |
377 | ||
26f54e9a MA |
378 | /* |
379 | * Increment @blk's reference count. | |
380 | * @blk must not be null. | |
381 | */ | |
382 | void blk_ref(BlockBackend *blk) | |
383 | { | |
384 | blk->refcnt++; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Decrement @blk's reference count. | |
389 | * If this drops it to zero, destroy @blk. | |
390 | * For convenience, do nothing if @blk is null. | |
391 | */ | |
392 | void blk_unref(BlockBackend *blk) | |
393 | { | |
394 | if (blk) { | |
395 | assert(blk->refcnt > 0); | |
396 | if (!--blk->refcnt) { | |
397 | blk_delete(blk); | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
2cf22d6a HR |
402 | /* |
403 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
404 | * ones which are hidden (i.e. are not referenced by the monitor). | |
405 | */ | |
a429b9b5 | 406 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a HR |
407 | { |
408 | return blk ? QTAILQ_NEXT(blk, link) | |
409 | : QTAILQ_FIRST(&block_backends); | |
410 | } | |
411 | ||
d8da3cef HR |
412 | void blk_remove_all_bs(void) |
413 | { | |
74d1b8fc | 414 | BlockBackend *blk = NULL; |
d8da3cef | 415 | |
2cf22d6a | 416 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
417 | AioContext *ctx = blk_get_aio_context(blk); |
418 | ||
419 | aio_context_acquire(ctx); | |
f21d96d0 | 420 | if (blk->root) { |
d8da3cef HR |
421 | blk_remove_bs(blk); |
422 | } | |
423 | aio_context_release(ctx); | |
424 | } | |
425 | } | |
426 | ||
26f54e9a | 427 | /* |
9492b0b9 | 428 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
429 | * If @blk is null, return the first one. |
430 | * Else, return @blk's next sibling, which may be null. | |
431 | * | |
432 | * To iterate over all BlockBackends, do | |
433 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
434 | * ... | |
435 | * } | |
436 | */ | |
437 | BlockBackend *blk_next(BlockBackend *blk) | |
438 | { | |
9492b0b9 HR |
439 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
440 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
441 | } |
442 | ||
7c8eece4 KW |
443 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
444 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 445 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 446 | { |
5e003f17 HR |
447 | BlockDriverState *bs, *old_bs; |
448 | ||
449 | /* Must be called from the main loop */ | |
450 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 451 | |
7c8eece4 KW |
452 | /* First, return all root nodes of BlockBackends. In order to avoid |
453 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
454 | * if the BB is the first one in the parent list of the BDS. */ | |
455 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
456 | BlockBackend *old_blk = it->blk; |
457 | ||
458 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
459 | ||
7c8eece4 KW |
460 | do { |
461 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
462 | bs = it->blk ? blk_bs(it->blk) : NULL; |
463 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 464 | |
5e003f17 HR |
465 | if (it->blk) { |
466 | blk_ref(it->blk); | |
467 | } | |
468 | blk_unref(old_blk); | |
469 | ||
88be7b4b | 470 | if (bs) { |
5e003f17 HR |
471 | bdrv_ref(bs); |
472 | bdrv_unref(old_bs); | |
88be7b4b | 473 | return bs; |
7c8eece4 KW |
474 | } |
475 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
476 | } else { |
477 | old_bs = it->bs; | |
7c8eece4 KW |
478 | } |
479 | ||
480 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
481 | * BDSes that are attached to a BlockBackend here; they have been handled | |
482 | * by the above block already */ | |
981f4f57 | 483 | do { |
7c8eece4 | 484 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
485 | bs = it->bs; |
486 | } while (bs && bdrv_has_blk(bs)); | |
487 | ||
5e003f17 HR |
488 | if (bs) { |
489 | bdrv_ref(bs); | |
490 | } | |
491 | bdrv_unref(old_bs); | |
492 | ||
88be7b4b KW |
493 | return bs; |
494 | } | |
495 | ||
5e003f17 | 496 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
497 | { |
498 | *it = (BdrvNextIterator) { | |
499 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
500 | }; | |
5e003f17 | 501 | } |
981f4f57 | 502 | |
5e003f17 HR |
503 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
504 | { | |
505 | bdrv_next_reset(it); | |
88be7b4b | 506 | return bdrv_next(it); |
981f4f57 HR |
507 | } |
508 | ||
5e003f17 HR |
509 | /* Must be called when aborting a bdrv_next() iteration before |
510 | * bdrv_next() returns NULL */ | |
511 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
512 | { | |
513 | /* Must be called from the main loop */ | |
514 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
515 | ||
516 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
517 | if (it->blk) { | |
518 | bdrv_unref(blk_bs(it->blk)); | |
519 | blk_unref(it->blk); | |
520 | } | |
521 | } else { | |
522 | bdrv_unref(it->bs); | |
523 | } | |
524 | ||
525 | bdrv_next_reset(it); | |
526 | } | |
527 | ||
e5e78550 HR |
528 | /* |
529 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
530 | * the given @name acting as the handle for the monitor. | |
531 | * Strictly for use by blockdev.c. | |
532 | * | |
533 | * @name must not be null or empty. | |
534 | * | |
535 | * Returns true on success and false on failure. In the latter case, an Error | |
536 | * object is returned through @errp. | |
537 | */ | |
538 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
539 | { | |
540 | assert(!blk->name); | |
541 | assert(name && name[0]); | |
542 | ||
543 | if (!id_wellformed(name)) { | |
544 | error_setg(errp, "Invalid device name"); | |
545 | return false; | |
546 | } | |
547 | if (blk_by_name(name)) { | |
548 | error_setg(errp, "Device with id '%s' already exists", name); | |
549 | return false; | |
550 | } | |
551 | if (bdrv_find_node(name)) { | |
552 | error_setg(errp, | |
553 | "Device name '%s' conflicts with an existing node name", | |
554 | name); | |
555 | return false; | |
556 | } | |
557 | ||
558 | blk->name = g_strdup(name); | |
559 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
560 | return true; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
565 | * Strictly for use by blockdev.c. | |
566 | */ | |
567 | void monitor_remove_blk(BlockBackend *blk) | |
568 | { | |
569 | if (!blk->name) { | |
570 | return; | |
571 | } | |
572 | ||
573 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
574 | g_free(blk->name); | |
575 | blk->name = NULL; | |
576 | } | |
577 | ||
26f54e9a | 578 | /* |
7e7d56d9 | 579 | * Return @blk's name, a non-null string. |
e5e78550 | 580 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 581 | */ |
0731a50f | 582 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 583 | { |
e5e78550 | 584 | return blk->name ?: ""; |
26f54e9a MA |
585 | } |
586 | ||
587 | /* | |
588 | * Return the BlockBackend with name @name if it exists, else null. | |
589 | * @name must not be null. | |
590 | */ | |
591 | BlockBackend *blk_by_name(const char *name) | |
592 | { | |
74d1b8fc | 593 | BlockBackend *blk = NULL; |
26f54e9a MA |
594 | |
595 | assert(name); | |
74d1b8fc | 596 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
597 | if (!strcmp(name, blk->name)) { |
598 | return blk; | |
599 | } | |
600 | } | |
601 | return NULL; | |
602 | } | |
7e7d56d9 MA |
603 | |
604 | /* | |
605 | * Return the BlockDriverState attached to @blk if any, else null. | |
606 | */ | |
607 | BlockDriverState *blk_bs(BlockBackend *blk) | |
608 | { | |
f21d96d0 | 609 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
610 | } |
611 | ||
7c8eece4 | 612 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
613 | { |
614 | BdrvChild *child; | |
615 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
616 | if (child->role == &child_root) { | |
7c8eece4 | 617 | return child->opaque; |
dde33812 KW |
618 | } |
619 | } | |
620 | ||
7c8eece4 KW |
621 | return NULL; |
622 | } | |
623 | ||
624 | /* | |
625 | * Returns true if @bs has an associated BlockBackend. | |
626 | */ | |
627 | bool bdrv_has_blk(BlockDriverState *bs) | |
628 | { | |
629 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
630 | } |
631 | ||
b6c1bae5 KW |
632 | /* |
633 | * Returns true if @bs has only BlockBackends as parents. | |
634 | */ | |
635 | bool bdrv_is_root_node(BlockDriverState *bs) | |
636 | { | |
637 | BdrvChild *c; | |
638 | ||
639 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
640 | if (c->role != &child_root) { | |
641 | return false; | |
642 | } | |
643 | } | |
644 | ||
645 | return true; | |
646 | } | |
647 | ||
18e46a03 MA |
648 | /* |
649 | * Return @blk's DriveInfo if any, else null. | |
650 | */ | |
651 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
652 | { | |
653 | return blk->legacy_dinfo; | |
654 | } | |
655 | ||
656 | /* | |
657 | * Set @blk's DriveInfo to @dinfo, and return it. | |
658 | * @blk must not have a DriveInfo set already. | |
659 | * No other BlockBackend may have the same DriveInfo set. | |
660 | */ | |
661 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
662 | { | |
663 | assert(!blk->legacy_dinfo); | |
664 | return blk->legacy_dinfo = dinfo; | |
665 | } | |
666 | ||
667 | /* | |
668 | * Return the BlockBackend with DriveInfo @dinfo. | |
669 | * It must exist. | |
670 | */ | |
671 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
672 | { | |
74d1b8fc | 673 | BlockBackend *blk = NULL; |
18e46a03 | 674 | |
74d1b8fc | 675 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
676 | if (blk->legacy_dinfo == dinfo) { |
677 | return blk; | |
678 | } | |
679 | } | |
680 | abort(); | |
681 | } | |
682 | ||
f2cd875d KW |
683 | /* |
684 | * Returns a pointer to the publicly accessible fields of @blk. | |
685 | */ | |
686 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
687 | { | |
688 | return &blk->public; | |
689 | } | |
690 | ||
691 | /* | |
692 | * Returns a BlockBackend given the associated @public fields. | |
693 | */ | |
694 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
695 | { | |
696 | return container_of(public, BlockBackend, public); | |
697 | } | |
698 | ||
1c95f7e1 HR |
699 | /* |
700 | * Disassociates the currently associated BlockDriverState from @blk. | |
701 | */ | |
702 | void blk_remove_bs(BlockBackend *blk) | |
703 | { | |
c89bcf3a | 704 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
632a7735 | 705 | BlockDriverState *bs; |
022cdc9f | 706 | |
3301f6c6 | 707 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 708 | if (tgm->throttle_state) { |
632a7735 ZL |
709 | bs = blk_bs(blk); |
710 | bdrv_drained_begin(bs); | |
c89bcf3a AG |
711 | throttle_group_detach_aio_context(tgm); |
712 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 713 | bdrv_drained_end(bs); |
a5614993 | 714 | } |
1c95f7e1 | 715 | |
7ca7f0f6 KW |
716 | blk_update_root_state(blk); |
717 | ||
f21d96d0 KW |
718 | bdrv_root_unref_child(blk->root); |
719 | blk->root = NULL; | |
1c95f7e1 HR |
720 | } |
721 | ||
0c3c36d6 HR |
722 | /* |
723 | * Associates a new BlockDriverState with @blk. | |
724 | */ | |
d7086422 | 725 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 726 | { |
c89bcf3a | 727 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
d5e6f437 | 728 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
d7086422 KW |
729 | blk->perm, blk->shared_perm, blk, errp); |
730 | if (blk->root == NULL) { | |
731 | return -EPERM; | |
732 | } | |
733 | bdrv_ref(bs); | |
3301f6c6 HR |
734 | |
735 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
736 | if (tgm->throttle_state) { |
737 | throttle_group_detach_aio_context(tgm); | |
738 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 739 | } |
d7086422 KW |
740 | |
741 | return 0; | |
0c3c36d6 HR |
742 | } |
743 | ||
981776b3 KW |
744 | /* |
745 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
746 | */ | |
747 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
748 | Error **errp) | |
749 | { | |
750 | int ret; | |
751 | ||
d35ff5e6 | 752 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
753 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
754 | if (ret < 0) { | |
755 | return ret; | |
756 | } | |
757 | } | |
758 | ||
759 | blk->perm = perm; | |
760 | blk->shared_perm = shared_perm; | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
887354bd KW |
765 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
766 | { | |
767 | *perm = blk->perm; | |
768 | *shared_perm = blk->shared_perm; | |
769 | } | |
770 | ||
bbc8ea98 | 771 | static int blk_do_attach_dev(BlockBackend *blk, void *dev) |
4be74634 | 772 | { |
a7f53e26 MA |
773 | if (blk->dev) { |
774 | return -EBUSY; | |
775 | } | |
d35ff5e6 KW |
776 | |
777 | /* While migration is still incoming, we don't need to apply the | |
778 | * permissions of guest device BlockBackends. We might still have a block | |
779 | * job or NBD server writing to the image for storage migration. */ | |
780 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
781 | blk->disable_perm = true; | |
782 | } | |
783 | ||
84ebe375 | 784 | blk_ref(blk); |
a7f53e26 | 785 | blk->dev = dev; |
bbc8ea98 | 786 | blk->legacy_dev = false; |
373340b2 | 787 | blk_iostatus_reset(blk); |
d35ff5e6 | 788 | |
a7f53e26 | 789 | return 0; |
4be74634 MA |
790 | } |
791 | ||
bbc8ea98 KW |
792 | /* |
793 | * Attach device model @dev to @blk. | |
794 | * Return 0 on success, -EBUSY when a device model is attached already. | |
795 | */ | |
796 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
797 | { | |
798 | return blk_do_attach_dev(blk, dev); | |
799 | } | |
800 | ||
a7f53e26 MA |
801 | /* |
802 | * Attach device model @dev to @blk. | |
803 | * @blk must not have a device model attached already. | |
804 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
805 | */ | |
bbc8ea98 | 806 | void blk_attach_dev_legacy(BlockBackend *blk, void *dev) |
4be74634 | 807 | { |
bbc8ea98 | 808 | if (blk_do_attach_dev(blk, dev) < 0) { |
a7f53e26 MA |
809 | abort(); |
810 | } | |
bbc8ea98 | 811 | blk->legacy_dev = true; |
4be74634 MA |
812 | } |
813 | ||
a7f53e26 MA |
814 | /* |
815 | * Detach device model @dev from @blk. | |
816 | * @dev must be currently attached to @blk. | |
817 | */ | |
4be74634 | 818 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 819 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 820 | { |
a7f53e26 MA |
821 | assert(blk->dev == dev); |
822 | blk->dev = NULL; | |
823 | blk->dev_ops = NULL; | |
824 | blk->dev_opaque = NULL; | |
68e9ec01 | 825 | blk->guest_block_size = 512; |
981776b3 | 826 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 827 | blk_unref(blk); |
4be74634 MA |
828 | } |
829 | ||
a7f53e26 MA |
830 | /* |
831 | * Return the device model attached to @blk if any, else null. | |
832 | */ | |
4be74634 | 833 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
834 | /* TODO change to return DeviceState * when all users are qdevified */ |
835 | { | |
836 | return blk->dev; | |
837 | } | |
838 | ||
2d76e724 KW |
839 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
840 | * device attached to the BlockBackend. */ | |
77beef83 | 841 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 KW |
842 | { |
843 | DeviceState *dev; | |
844 | ||
845 | assert(!blk->legacy_dev); | |
846 | dev = blk->dev; | |
847 | ||
848 | if (!dev) { | |
849 | return g_strdup(""); | |
850 | } else if (dev->id) { | |
851 | return g_strdup(dev->id); | |
852 | } | |
853 | return object_get_canonical_path(OBJECT(dev)); | |
854 | } | |
855 | ||
1c89e1fa KW |
856 | /* |
857 | * Return the BlockBackend which has the device model @dev attached if it | |
858 | * exists, else null. | |
859 | * | |
860 | * @dev must not be null. | |
861 | */ | |
862 | BlockBackend *blk_by_dev(void *dev) | |
863 | { | |
864 | BlockBackend *blk = NULL; | |
865 | ||
866 | assert(dev != NULL); | |
867 | while ((blk = blk_all_next(blk)) != NULL) { | |
868 | if (blk->dev == dev) { | |
869 | return blk; | |
870 | } | |
871 | } | |
872 | return NULL; | |
873 | } | |
874 | ||
a7f53e26 MA |
875 | /* |
876 | * Set @blk's device model callbacks to @ops. | |
877 | * @opaque is the opaque argument to pass to the callbacks. | |
878 | * This is for use by device models. | |
879 | */ | |
880 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
881 | void *opaque) | |
882 | { | |
bbc8ea98 | 883 | /* All drivers that use blk_set_dev_ops() are qdevified and we want to keep |
f4d9cc88 JS |
884 | * it that way, so we can assume blk->dev, if present, is a DeviceState if |
885 | * blk->dev_ops is set. Non-device users may use dev_ops without device. */ | |
bbc8ea98 KW |
886 | assert(!blk->legacy_dev); |
887 | ||
a7f53e26 MA |
888 | blk->dev_ops = ops; |
889 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
890 | |
891 | /* Are we currently quiesced? Should we enforce this right now? */ | |
892 | if (blk->quiesce_counter && ops->drained_begin) { | |
893 | ops->drained_begin(opaque); | |
894 | } | |
a7f53e26 MA |
895 | } |
896 | ||
897 | /* | |
898 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
899 | * |
900 | * If @load is true, notify of media load. This action can fail, meaning that | |
901 | * the medium cannot be loaded. @errp is set then. | |
902 | * | |
903 | * If @load is false, notify of media eject. This can never fail. | |
904 | * | |
a7f53e26 MA |
905 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
906 | */ | |
39829a01 | 907 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 MA |
908 | { |
909 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 910 | bool tray_was_open, tray_is_open; |
39829a01 | 911 | Error *local_err = NULL; |
a7f53e26 | 912 | |
2d76e724 KW |
913 | assert(!blk->legacy_dev); |
914 | ||
f1f57066 | 915 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
916 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
917 | if (local_err) { | |
918 | assert(load == true); | |
919 | error_propagate(errp, local_err); | |
920 | return; | |
921 | } | |
f1f57066 HR |
922 | tray_is_open = blk_dev_is_tray_open(blk); |
923 | ||
924 | if (tray_was_open != tray_is_open) { | |
2d76e724 KW |
925 | char *id = blk_get_attached_dev_id(blk); |
926 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open, | |
f1f57066 | 927 | &error_abort); |
2d76e724 | 928 | g_free(id); |
a7f53e26 MA |
929 | } |
930 | } | |
931 | } | |
932 | ||
5c8cab48 KW |
933 | static void blk_root_change_media(BdrvChild *child, bool load) |
934 | { | |
39829a01 | 935 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
936 | } |
937 | ||
a7f53e26 MA |
938 | /* |
939 | * Does @blk's attached device model have removable media? | |
940 | * %true if no device model is attached. | |
941 | */ | |
942 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
943 | { | |
944 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
945 | } | |
946 | ||
8f3a73bc HR |
947 | /* |
948 | * Does @blk's attached device model have a tray? | |
949 | */ | |
950 | bool blk_dev_has_tray(BlockBackend *blk) | |
951 | { | |
952 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
953 | } | |
954 | ||
a7f53e26 MA |
955 | /* |
956 | * Notify @blk's attached device model of a media eject request. | |
957 | * If @force is true, the medium is about to be yanked out forcefully. | |
958 | */ | |
959 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 960 | { |
a7f53e26 MA |
961 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
962 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
963 | } | |
4be74634 MA |
964 | } |
965 | ||
a7f53e26 MA |
966 | /* |
967 | * Does @blk's attached device model have a tray, and is it open? | |
968 | */ | |
969 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 970 | { |
8f3a73bc | 971 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
972 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
973 | } | |
974 | return false; | |
975 | } | |
976 | ||
977 | /* | |
978 | * Does @blk's attached device model have the medium locked? | |
979 | * %false if the device model has no such lock. | |
980 | */ | |
981 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
982 | { | |
983 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
984 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
985 | } | |
986 | return false; | |
987 | } | |
988 | ||
989 | /* | |
990 | * Notify @blk's attached device model of a backend size change. | |
991 | */ | |
5c8cab48 | 992 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 993 | { |
5c8cab48 KW |
994 | BlockBackend *blk = child->opaque; |
995 | ||
a7f53e26 MA |
996 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
997 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
998 | } | |
999 | } | |
1000 | ||
1001 | void blk_iostatus_enable(BlockBackend *blk) | |
1002 | { | |
373340b2 HR |
1003 | blk->iostatus_enabled = true; |
1004 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1005 | } | |
1006 | ||
1007 | /* The I/O status is only enabled if the drive explicitly | |
1008 | * enables it _and_ the VM is configured to stop on errors */ | |
1009 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1010 | { | |
1011 | return (blk->iostatus_enabled && | |
1012 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1013 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1014 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1015 | } | |
1016 | ||
1017 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1018 | { | |
1019 | return blk->iostatus; | |
1020 | } | |
1021 | ||
1022 | void blk_iostatus_disable(BlockBackend *blk) | |
1023 | { | |
1024 | blk->iostatus_enabled = false; | |
1025 | } | |
1026 | ||
1027 | void blk_iostatus_reset(BlockBackend *blk) | |
1028 | { | |
1029 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 1030 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 1031 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
1032 | if (bs && bs->job) { |
1033 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
1034 | } |
1035 | } | |
1036 | } | |
1037 | ||
1038 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1039 | { | |
1040 | assert(blk_iostatus_is_enabled(blk)); | |
1041 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1042 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1043 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1044 | } | |
4be74634 MA |
1045 | } |
1046 | ||
c10c9d96 KW |
1047 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1048 | { | |
1049 | blk->allow_write_beyond_eof = allow; | |
1050 | } | |
1051 | ||
e7f7d676 HR |
1052 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
1053 | size_t size) | |
1054 | { | |
1055 | int64_t len; | |
1056 | ||
1057 | if (size > INT_MAX) { | |
1058 | return -EIO; | |
1059 | } | |
1060 | ||
c09ba36c | 1061 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
1062 | return -ENOMEDIUM; |
1063 | } | |
1064 | ||
e7f7d676 HR |
1065 | if (offset < 0) { |
1066 | return -EIO; | |
1067 | } | |
1068 | ||
c10c9d96 KW |
1069 | if (!blk->allow_write_beyond_eof) { |
1070 | len = blk_getlength(blk); | |
1071 | if (len < 0) { | |
1072 | return len; | |
1073 | } | |
1074 | ||
1075 | if (offset > len || len - offset < size) { | |
1076 | return -EIO; | |
1077 | } | |
e7f7d676 HR |
1078 | } |
1079 | ||
1080 | return 0; | |
1081 | } | |
1082 | ||
1e98fefd KW |
1083 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
1084 | unsigned int bytes, QEMUIOVector *qiov, | |
1085 | BdrvRequestFlags flags) | |
4be74634 | 1086 | { |
1e98fefd | 1087 | int ret; |
99723548 | 1088 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 1089 | |
99723548 | 1090 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1091 | |
1092 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1093 | if (ret < 0) { |
1094 | return ret; | |
1095 | } | |
1096 | ||
99723548 PB |
1097 | bdrv_inc_in_flight(bs); |
1098 | ||
441565b2 | 1099 | /* throttling disk I/O */ |
022cdc9f MP |
1100 | if (blk->public.throttle_group_member.throttle_state) { |
1101 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1102 | bytes, false); | |
441565b2 KW |
1103 | } |
1104 | ||
99723548 PB |
1105 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
1106 | bdrv_dec_in_flight(bs); | |
1107 | return ret; | |
1bf1cbc9 KW |
1108 | } |
1109 | ||
1e98fefd KW |
1110 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
1111 | unsigned int bytes, QEMUIOVector *qiov, | |
1112 | BdrvRequestFlags flags) | |
a8823a3b | 1113 | { |
bfd18d1e | 1114 | int ret; |
99723548 | 1115 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 1116 | |
99723548 | 1117 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1118 | |
bfd18d1e | 1119 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1120 | if (ret < 0) { |
1121 | return ret; | |
1122 | } | |
1123 | ||
99723548 | 1124 | bdrv_inc_in_flight(bs); |
441565b2 | 1125 | /* throttling disk I/O */ |
022cdc9f MP |
1126 | if (blk->public.throttle_group_member.throttle_state) { |
1127 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1128 | bytes, true); | |
441565b2 KW |
1129 | } |
1130 | ||
bfd18d1e KW |
1131 | if (!blk->enable_write_cache) { |
1132 | flags |= BDRV_REQ_FUA; | |
1133 | } | |
1134 | ||
99723548 PB |
1135 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
1136 | bdrv_dec_in_flight(bs); | |
1137 | return ret; | |
a8823a3b KW |
1138 | } |
1139 | ||
1bf1cbc9 KW |
1140 | typedef struct BlkRwCo { |
1141 | BlockBackend *blk; | |
1142 | int64_t offset; | |
1143 | QEMUIOVector *qiov; | |
1144 | int ret; | |
1145 | BdrvRequestFlags flags; | |
1146 | } BlkRwCo; | |
1147 | ||
1148 | static void blk_read_entry(void *opaque) | |
1149 | { | |
1150 | BlkRwCo *rwco = opaque; | |
1151 | ||
1152 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
1153 | rwco->qiov, rwco->flags); | |
1154 | } | |
1155 | ||
a8823a3b KW |
1156 | static void blk_write_entry(void *opaque) |
1157 | { | |
1158 | BlkRwCo *rwco = opaque; | |
1159 | ||
1160 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
1161 | rwco->qiov, rwco->flags); | |
1162 | } | |
1163 | ||
a55d3fba KW |
1164 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1165 | int64_t bytes, CoroutineEntry co_entry, | |
1166 | BdrvRequestFlags flags) | |
1bf1cbc9 | 1167 | { |
1bf1cbc9 KW |
1168 | QEMUIOVector qiov; |
1169 | struct iovec iov; | |
1bf1cbc9 KW |
1170 | BlkRwCo rwco; |
1171 | ||
1bf1cbc9 KW |
1172 | iov = (struct iovec) { |
1173 | .iov_base = buf, | |
a55d3fba | 1174 | .iov_len = bytes, |
1bf1cbc9 KW |
1175 | }; |
1176 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1177 | ||
1178 | rwco = (BlkRwCo) { | |
1179 | .blk = blk, | |
a55d3fba | 1180 | .offset = offset, |
1bf1cbc9 | 1181 | .qiov = &qiov, |
fc1453cd | 1182 | .flags = flags, |
1bf1cbc9 KW |
1183 | .ret = NOT_DONE, |
1184 | }; | |
1185 | ||
35f106e6 PB |
1186 | if (qemu_in_coroutine()) { |
1187 | /* Fast-path if already in coroutine context */ | |
1188 | co_entry(&rwco); | |
1189 | } else { | |
1190 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
e92f0e19 | 1191 | bdrv_coroutine_enter(blk_bs(blk), co); |
35f106e6 PB |
1192 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); |
1193 | } | |
1bf1cbc9 KW |
1194 | |
1195 | return rwco.ret; | |
4be74634 MA |
1196 | } |
1197 | ||
b7d17f9f EB |
1198 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1199 | int count) | |
4be74634 | 1200 | { |
5bd51196 KW |
1201 | int ret; |
1202 | ||
b7d17f9f | 1203 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1204 | if (ret < 0) { |
1205 | return ret; | |
1206 | } | |
1207 | ||
c2066af0 | 1208 | blk_root_drained_begin(blk->root); |
b7d17f9f | 1209 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 1210 | blk_root_drained_end(blk->root); |
5bd51196 | 1211 | return ret; |
4be74634 MA |
1212 | } |
1213 | ||
d004bd52 | 1214 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 1215 | int bytes, BdrvRequestFlags flags) |
0df89e8e | 1216 | { |
f5a5ca79 | 1217 | return blk_prw(blk, offset, NULL, bytes, blk_write_entry, |
983a1600 | 1218 | flags | BDRV_REQ_ZERO_WRITE); |
0df89e8e KW |
1219 | } |
1220 | ||
720ff280 KW |
1221 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1222 | { | |
1223 | return bdrv_make_zero(blk->root, flags); | |
1224 | } | |
1225 | ||
e7f7d676 HR |
1226 | static void error_callback_bh(void *opaque) |
1227 | { | |
1228 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 PB |
1229 | |
1230 | bdrv_dec_in_flight(acb->common.bs); | |
e7f7d676 HR |
1231 | acb->common.cb(acb->common.opaque, acb->ret); |
1232 | qemu_aio_unref(acb); | |
1233 | } | |
1234 | ||
ca78ecfa PL |
1235 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1236 | BlockCompletionFunc *cb, | |
1237 | void *opaque, int ret) | |
e7f7d676 HR |
1238 | { |
1239 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 1240 | |
99723548 | 1241 | bdrv_inc_in_flight(blk_bs(blk)); |
e7f7d676 | 1242 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1243 | acb->blk = blk; |
e7f7d676 HR |
1244 | acb->ret = ret; |
1245 | ||
fffb6e12 | 1246 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
1247 | return &acb->common; |
1248 | } | |
1249 | ||
57d6a428 KW |
1250 | typedef struct BlkAioEmAIOCB { |
1251 | BlockAIOCB common; | |
1252 | BlkRwCo rwco; | |
7fa84cd8 | 1253 | int bytes; |
57d6a428 | 1254 | bool has_returned; |
57d6a428 KW |
1255 | } BlkAioEmAIOCB; |
1256 | ||
1257 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1258 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1259 | }; | |
1260 | ||
1261 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1262 | { | |
57d6a428 | 1263 | if (acb->has_returned) { |
99723548 | 1264 | bdrv_dec_in_flight(acb->common.bs); |
57d6a428 KW |
1265 | acb->common.cb(acb->common.opaque, acb->rwco.ret); |
1266 | qemu_aio_unref(acb); | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | static void blk_aio_complete_bh(void *opaque) | |
1271 | { | |
fffb6e12 | 1272 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1273 | assert(acb->has_returned); |
1274 | blk_aio_complete(acb); | |
57d6a428 KW |
1275 | } |
1276 | ||
7fa84cd8 | 1277 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
1278 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
1279 | BdrvRequestFlags flags, | |
1280 | BlockCompletionFunc *cb, void *opaque) | |
1281 | { | |
1282 | BlkAioEmAIOCB *acb; | |
1283 | Coroutine *co; | |
1284 | ||
99723548 | 1285 | bdrv_inc_in_flight(blk_bs(blk)); |
57d6a428 KW |
1286 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1287 | acb->rwco = (BlkRwCo) { | |
1288 | .blk = blk, | |
1289 | .offset = offset, | |
1290 | .qiov = qiov, | |
1291 | .flags = flags, | |
1292 | .ret = NOT_DONE, | |
1293 | }; | |
7fa84cd8 | 1294 | acb->bytes = bytes; |
57d6a428 KW |
1295 | acb->has_returned = false; |
1296 | ||
0b8b8753 | 1297 | co = qemu_coroutine_create(co_entry, acb); |
e92f0e19 | 1298 | bdrv_coroutine_enter(blk_bs(blk), co); |
57d6a428 KW |
1299 | |
1300 | acb->has_returned = true; | |
1301 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1302 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1303 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1304 | } |
1305 | ||
1306 | return &acb->common; | |
1307 | } | |
1308 | ||
1309 | static void blk_aio_read_entry(void *opaque) | |
1310 | { | |
1311 | BlkAioEmAIOCB *acb = opaque; | |
1312 | BlkRwCo *rwco = &acb->rwco; | |
1313 | ||
7fa84cd8 KW |
1314 | assert(rwco->qiov->size == acb->bytes); |
1315 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1316 | rwco->qiov, rwco->flags); |
1317 | blk_aio_complete(acb); | |
1318 | } | |
1319 | ||
1320 | static void blk_aio_write_entry(void *opaque) | |
1321 | { | |
1322 | BlkAioEmAIOCB *acb = opaque; | |
1323 | BlkRwCo *rwco = &acb->rwco; | |
1324 | ||
7fa84cd8 KW |
1325 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
1326 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1327 | rwco->qiov, rwco->flags); |
1328 | blk_aio_complete(acb); | |
1329 | } | |
1330 | ||
d004bd52 EB |
1331 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1332 | int count, BdrvRequestFlags flags, | |
1333 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1334 | { |
983a1600 EB |
1335 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1336 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1337 | } |
1338 | ||
1339 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1340 | { | |
a55d3fba | 1341 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1342 | if (ret < 0) { |
1343 | return ret; | |
1344 | } | |
a55d3fba | 1345 | return count; |
4be74634 MA |
1346 | } |
1347 | ||
8341f00d EB |
1348 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1349 | BdrvRequestFlags flags) | |
4be74634 | 1350 | { |
8341f00d EB |
1351 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1352 | flags); | |
e7f7d676 HR |
1353 | if (ret < 0) { |
1354 | return ret; | |
1355 | } | |
a55d3fba | 1356 | return count; |
4be74634 MA |
1357 | } |
1358 | ||
1359 | int64_t blk_getlength(BlockBackend *blk) | |
1360 | { | |
c09ba36c HR |
1361 | if (!blk_is_available(blk)) { |
1362 | return -ENOMEDIUM; | |
1363 | } | |
1364 | ||
f21d96d0 | 1365 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1366 | } |
1367 | ||
1368 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1369 | { | |
f21d96d0 | 1370 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1371 | *nb_sectors_ptr = 0; |
1372 | } else { | |
f21d96d0 | 1373 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1374 | } |
4be74634 MA |
1375 | } |
1376 | ||
1ef01253 HR |
1377 | int64_t blk_nb_sectors(BlockBackend *blk) |
1378 | { | |
c09ba36c HR |
1379 | if (!blk_is_available(blk)) { |
1380 | return -ENOMEDIUM; | |
1381 | } | |
1382 | ||
f21d96d0 | 1383 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1384 | } |
1385 | ||
60cb2fa7 EB |
1386 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1387 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1388 | BlockCompletionFunc *cb, void *opaque) | |
1389 | { | |
1390 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1391 | blk_aio_read_entry, flags, cb, opaque); | |
1392 | } | |
1393 | ||
60cb2fa7 EB |
1394 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1395 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1396 | BlockCompletionFunc *cb, void *opaque) | |
1397 | { | |
1398 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1399 | blk_aio_write_entry, flags, cb, opaque); | |
1400 | } | |
1401 | ||
be07a889 KW |
1402 | static void blk_aio_flush_entry(void *opaque) |
1403 | { | |
1404 | BlkAioEmAIOCB *acb = opaque; | |
1405 | BlkRwCo *rwco = &acb->rwco; | |
1406 | ||
1407 | rwco->ret = blk_co_flush(rwco->blk); | |
1408 | blk_aio_complete(acb); | |
1409 | } | |
1410 | ||
4be74634 MA |
1411 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1412 | BlockCompletionFunc *cb, void *opaque) | |
1413 | { | |
be07a889 | 1414 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1415 | } |
1416 | ||
8c2e3dd5 KW |
1417 | static void blk_aio_pdiscard_entry(void *opaque) |
1418 | { | |
1419 | BlkAioEmAIOCB *acb = opaque; | |
1420 | BlkRwCo *rwco = &acb->rwco; | |
1421 | ||
1422 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1423 | blk_aio_complete(acb); | |
1424 | } | |
1425 | ||
1c6c4bb7 | 1426 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
f5a5ca79 | 1427 | int64_t offset, int bytes, |
1c6c4bb7 | 1428 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1429 | { |
f5a5ca79 | 1430 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
8c2e3dd5 | 1431 | cb, opaque); |
4be74634 MA |
1432 | } |
1433 | ||
1434 | void blk_aio_cancel(BlockAIOCB *acb) | |
1435 | { | |
1436 | bdrv_aio_cancel(acb); | |
1437 | } | |
1438 | ||
1439 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1440 | { | |
1441 | bdrv_aio_cancel_async(acb); | |
1442 | } | |
1443 | ||
48af776a | 1444 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1445 | { |
c09ba36c HR |
1446 | if (!blk_is_available(blk)) { |
1447 | return -ENOMEDIUM; | |
1448 | } | |
1449 | ||
48af776a KW |
1450 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1451 | } | |
1452 | ||
1453 | static void blk_ioctl_entry(void *opaque) | |
1454 | { | |
1455 | BlkRwCo *rwco = opaque; | |
1456 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1457 | rwco->qiov->iov[0].iov_base); | |
1458 | } | |
1459 | ||
1460 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1461 | { | |
1462 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1463 | } | |
1464 | ||
1465 | static void blk_aio_ioctl_entry(void *opaque) | |
1466 | { | |
1467 | BlkAioEmAIOCB *acb = opaque; | |
1468 | BlkRwCo *rwco = &acb->rwco; | |
1469 | ||
1470 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1471 | rwco->qiov->iov[0].iov_base); | |
1472 | blk_aio_complete(acb); | |
4be74634 MA |
1473 | } |
1474 | ||
1475 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1476 | BlockCompletionFunc *cb, void *opaque) | |
1477 | { | |
48af776a KW |
1478 | QEMUIOVector qiov; |
1479 | struct iovec iov; | |
1480 | ||
1481 | iov = (struct iovec) { | |
1482 | .iov_base = buf, | |
1483 | .iov_len = 0, | |
1484 | }; | |
1485 | qemu_iovec_init_external(&qiov, &iov, 1); | |
c09ba36c | 1486 | |
48af776a | 1487 | return blk_aio_prwv(blk, req, 0, &qiov, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1488 | } |
1489 | ||
f5a5ca79 | 1490 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
2bb0dce7 | 1491 | { |
f5a5ca79 | 1492 | int ret = blk_check_byte_request(blk, offset, bytes); |
e7f7d676 HR |
1493 | if (ret < 0) { |
1494 | return ret; | |
1495 | } | |
1496 | ||
f5a5ca79 | 1497 | return bdrv_co_pdiscard(blk_bs(blk), offset, bytes); |
2bb0dce7 HR |
1498 | } |
1499 | ||
1500 | int blk_co_flush(BlockBackend *blk) | |
1501 | { | |
c09ba36c HR |
1502 | if (!blk_is_available(blk)) { |
1503 | return -ENOMEDIUM; | |
1504 | } | |
1505 | ||
f21d96d0 | 1506 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1507 | } |
1508 | ||
be07a889 | 1509 | static void blk_flush_entry(void *opaque) |
4be74634 | 1510 | { |
be07a889 KW |
1511 | BlkRwCo *rwco = opaque; |
1512 | rwco->ret = blk_co_flush(rwco->blk); | |
1513 | } | |
c09ba36c | 1514 | |
be07a889 KW |
1515 | int blk_flush(BlockBackend *blk) |
1516 | { | |
1517 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1518 | } |
1519 | ||
97b0385a AY |
1520 | void blk_drain(BlockBackend *blk) |
1521 | { | |
f21d96d0 KW |
1522 | if (blk_bs(blk)) { |
1523 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1524 | } |
97b0385a AY |
1525 | } |
1526 | ||
4be74634 MA |
1527 | void blk_drain_all(void) |
1528 | { | |
1529 | bdrv_drain_all(); | |
1530 | } | |
1531 | ||
373340b2 HR |
1532 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1533 | BlockdevOnError on_write_error) | |
1534 | { | |
1535 | blk->on_read_error = on_read_error; | |
1536 | blk->on_write_error = on_write_error; | |
1537 | } | |
1538 | ||
4be74634 MA |
1539 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1540 | { | |
373340b2 | 1541 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1542 | } |
1543 | ||
1544 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1545 | int error) | |
1546 | { | |
373340b2 HR |
1547 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1548 | ||
1549 | switch (on_err) { | |
1550 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1551 | return (error == ENOSPC) ? | |
1552 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1553 | case BLOCKDEV_ON_ERROR_STOP: | |
1554 | return BLOCK_ERROR_ACTION_STOP; | |
1555 | case BLOCKDEV_ON_ERROR_REPORT: | |
1556 | return BLOCK_ERROR_ACTION_REPORT; | |
1557 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1558 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1559 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1560 | default: |
1561 | abort(); | |
1562 | } | |
4be74634 MA |
1563 | } |
1564 | ||
373340b2 HR |
1565 | static void send_qmp_error_event(BlockBackend *blk, |
1566 | BlockErrorAction action, | |
1567 | bool is_read, int error) | |
1568 | { | |
1569 | IoOperationType optype; | |
1570 | ||
1571 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
2bf7e10f KW |
1572 | qapi_event_send_block_io_error(blk_name(blk), |
1573 | bdrv_get_node_name(blk_bs(blk)), optype, | |
1574 | action, blk_iostatus_is_enabled(blk), | |
373340b2 HR |
1575 | error == ENOSPC, strerror(error), |
1576 | &error_abort); | |
1577 | } | |
1578 | ||
1579 | /* This is done by device models because, while the block layer knows | |
1580 | * about the error, it does not know whether an operation comes from | |
1581 | * the device or the block layer (from a job, for example). | |
1582 | */ | |
4be74634 MA |
1583 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1584 | bool is_read, int error) | |
1585 | { | |
373340b2 HR |
1586 | assert(error >= 0); |
1587 | ||
1588 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1589 | /* First set the iostatus, so that "info block" returns an iostatus | |
1590 | * that matches the events raised so far (an additional error iostatus | |
1591 | * is fine, but not a lost one). | |
1592 | */ | |
1593 | blk_iostatus_set_err(blk, error); | |
1594 | ||
1595 | /* Then raise the request to stop the VM and the event. | |
1596 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1597 | * it ensures that the STOP event always comes after the | |
1598 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1599 | * can observe the STOP event and do a "cont" before the STOP | |
1600 | * event is issued, the VM will not stop. In this case, vm_start() | |
1601 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1602 | */ | |
1603 | qemu_system_vmstop_request_prepare(); | |
1604 | send_qmp_error_event(blk, action, is_read, error); | |
1605 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1606 | } else { | |
1607 | send_qmp_error_event(blk, action, is_read, error); | |
1608 | } | |
4be74634 MA |
1609 | } |
1610 | ||
1611 | int blk_is_read_only(BlockBackend *blk) | |
1612 | { | |
f21d96d0 KW |
1613 | BlockDriverState *bs = blk_bs(blk); |
1614 | ||
1615 | if (bs) { | |
1616 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1617 | } else { |
1618 | return blk->root_state.read_only; | |
1619 | } | |
4be74634 MA |
1620 | } |
1621 | ||
1622 | int blk_is_sg(BlockBackend *blk) | |
1623 | { | |
f21d96d0 KW |
1624 | BlockDriverState *bs = blk_bs(blk); |
1625 | ||
1626 | if (!bs) { | |
a46fc9c9 HR |
1627 | return 0; |
1628 | } | |
1629 | ||
f21d96d0 | 1630 | return bdrv_is_sg(bs); |
4be74634 MA |
1631 | } |
1632 | ||
1633 | int blk_enable_write_cache(BlockBackend *blk) | |
1634 | { | |
bfd18d1e | 1635 | return blk->enable_write_cache; |
4be74634 MA |
1636 | } |
1637 | ||
1638 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1639 | { | |
bfd18d1e | 1640 | blk->enable_write_cache = wce; |
4be74634 MA |
1641 | } |
1642 | ||
2bb0dce7 HR |
1643 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1644 | { | |
f21d96d0 KW |
1645 | BlockDriverState *bs = blk_bs(blk); |
1646 | ||
1647 | if (!bs) { | |
c09ba36c HR |
1648 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1649 | return; | |
1650 | } | |
1651 | ||
f21d96d0 | 1652 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1653 | } |
1654 | ||
e031f750 | 1655 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1656 | { |
f21d96d0 KW |
1657 | BlockDriverState *bs = blk_bs(blk); |
1658 | ||
1659 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1660 | } |
1661 | ||
1662 | bool blk_is_available(BlockBackend *blk) | |
1663 | { | |
1664 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1665 | } |
1666 | ||
1667 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1668 | { | |
f21d96d0 KW |
1669 | BlockDriverState *bs = blk_bs(blk); |
1670 | ||
1671 | if (bs) { | |
1672 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1673 | } |
4be74634 MA |
1674 | } |
1675 | ||
1676 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1677 | { | |
f21d96d0 | 1678 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1679 | char *id; |
1680 | ||
1681 | /* blk_eject is only called by qdevified devices */ | |
1682 | assert(!blk->legacy_dev); | |
f21d96d0 KW |
1683 | |
1684 | if (bs) { | |
1685 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1686 | } |
c47ee043 JS |
1687 | |
1688 | /* Whether or not we ejected on the backend, | |
1689 | * the frontend experienced a tray event. */ | |
1690 | id = blk_get_attached_dev_id(blk); | |
1691 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
1692 | eject_flag, &error_abort); | |
1693 | g_free(id); | |
4be74634 MA |
1694 | } |
1695 | ||
1696 | int blk_get_flags(BlockBackend *blk) | |
1697 | { | |
f21d96d0 KW |
1698 | BlockDriverState *bs = blk_bs(blk); |
1699 | ||
1700 | if (bs) { | |
1701 | return bdrv_get_flags(bs); | |
061959e8 HR |
1702 | } else { |
1703 | return blk->root_state.open_flags; | |
1704 | } | |
4be74634 MA |
1705 | } |
1706 | ||
5def6b80 EB |
1707 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1708 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1709 | { |
f21d96d0 | 1710 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1711 | uint32_t max = 0; |
f21d96d0 KW |
1712 | |
1713 | if (bs) { | |
5def6b80 | 1714 | max = bs->bl.max_transfer; |
a46fc9c9 | 1715 | } |
5def6b80 | 1716 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1717 | } |
1718 | ||
648296e0 SH |
1719 | int blk_get_max_iov(BlockBackend *blk) |
1720 | { | |
f21d96d0 | 1721 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1722 | } |
1723 | ||
4be74634 MA |
1724 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1725 | { | |
68e9ec01 | 1726 | blk->guest_block_size = align; |
4be74634 MA |
1727 | } |
1728 | ||
f1c17521 PB |
1729 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1730 | { | |
f21d96d0 | 1731 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1732 | } |
1733 | ||
4be74634 MA |
1734 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1735 | { | |
f21d96d0 | 1736 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1737 | } |
1738 | ||
1739 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1740 | { | |
f21d96d0 KW |
1741 | BlockDriverState *bs = blk_bs(blk); |
1742 | ||
1743 | if (!bs) { | |
a46fc9c9 HR |
1744 | return false; |
1745 | } | |
1746 | ||
f21d96d0 | 1747 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1748 | } |
1749 | ||
1750 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1751 | { | |
f21d96d0 KW |
1752 | BlockDriverState *bs = blk_bs(blk); |
1753 | ||
1754 | if (bs) { | |
1755 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1756 | } |
4be74634 MA |
1757 | } |
1758 | ||
1759 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1760 | { | |
f21d96d0 KW |
1761 | BlockDriverState *bs = blk_bs(blk); |
1762 | ||
1763 | if (bs) { | |
1764 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1765 | } |
4be74634 MA |
1766 | } |
1767 | ||
1768 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1769 | { | |
f21d96d0 KW |
1770 | BlockDriverState *bs = blk_bs(blk); |
1771 | ||
1772 | if (bs) { | |
1773 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1774 | } |
4be74634 MA |
1775 | } |
1776 | ||
1777 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1778 | { | |
f21d96d0 KW |
1779 | BlockDriverState *bs = blk_bs(blk); |
1780 | ||
1781 | if (bs) { | |
1782 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1783 | } else { |
1784 | return qemu_get_aio_context(); | |
1785 | } | |
1786 | } | |
1787 | ||
1788 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1789 | { | |
1790 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1791 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1792 | } |
1793 | ||
1794 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1795 | { | |
f21d96d0 | 1796 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 1797 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
f21d96d0 KW |
1798 | |
1799 | if (bs) { | |
c61791fc | 1800 | if (tgm->throttle_state) { |
dc868fb0 | 1801 | bdrv_drained_begin(bs); |
c61791fc MP |
1802 | throttle_group_detach_aio_context(tgm); |
1803 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 1804 | bdrv_drained_end(bs); |
7ca7f0f6 | 1805 | } |
f21d96d0 | 1806 | bdrv_set_aio_context(bs, new_context); |
a46fc9c9 | 1807 | } |
4be74634 MA |
1808 | } |
1809 | ||
2019ba0a HR |
1810 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1811 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1812 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1813 | { | |
f21d96d0 KW |
1814 | BlockDriverState *bs = blk_bs(blk); |
1815 | ||
1816 | if (bs) { | |
1817 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1818 | detach_aio_context, opaque); |
1819 | } | |
2019ba0a HR |
1820 | } |
1821 | ||
1822 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1823 | void (*attached_aio_context)(AioContext *, | |
1824 | void *), | |
1825 | void (*detach_aio_context)(void *), | |
1826 | void *opaque) | |
1827 | { | |
f21d96d0 KW |
1828 | BlockDriverState *bs = blk_bs(blk); |
1829 | ||
1830 | if (bs) { | |
1831 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1832 | detach_aio_context, opaque); |
1833 | } | |
2019ba0a HR |
1834 | } |
1835 | ||
3301f6c6 HR |
1836 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1837 | { | |
1838 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1839 | } | |
1840 | ||
1841 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1842 | { | |
1843 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1844 | } | |
1845 | ||
4be74634 MA |
1846 | void blk_io_plug(BlockBackend *blk) |
1847 | { | |
f21d96d0 KW |
1848 | BlockDriverState *bs = blk_bs(blk); |
1849 | ||
1850 | if (bs) { | |
1851 | bdrv_io_plug(bs); | |
a46fc9c9 | 1852 | } |
4be74634 MA |
1853 | } |
1854 | ||
1855 | void blk_io_unplug(BlockBackend *blk) | |
1856 | { | |
f21d96d0 KW |
1857 | BlockDriverState *bs = blk_bs(blk); |
1858 | ||
1859 | if (bs) { | |
1860 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1861 | } |
4be74634 MA |
1862 | } |
1863 | ||
1864 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1865 | { | |
7f0e9da6 | 1866 | return &blk->stats; |
4be74634 MA |
1867 | } |
1868 | ||
1869 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1870 | BlockCompletionFunc *cb, void *opaque) | |
1871 | { | |
1872 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1873 | } | |
1ef01253 | 1874 | |
d004bd52 | 1875 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 1876 | int bytes, BdrvRequestFlags flags) |
1ef01253 | 1877 | { |
f5a5ca79 | 1878 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 1879 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1880 | } |
1881 | ||
fe5c1355 PB |
1882 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1883 | int count) | |
1ef01253 | 1884 | { |
35fadca8 PB |
1885 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1886 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
1887 | } |
1888 | ||
3a691c50 HR |
1889 | int blk_truncate(BlockBackend *blk, int64_t offset, PreallocMode prealloc, |
1890 | Error **errp) | |
1ef01253 | 1891 | { |
c09ba36c | 1892 | if (!blk_is_available(blk)) { |
ed3d2ec9 | 1893 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
1894 | return -ENOMEDIUM; |
1895 | } | |
1896 | ||
3a691c50 | 1897 | return bdrv_truncate(blk->root, offset, prealloc, errp); |
1ef01253 HR |
1898 | } |
1899 | ||
8c2e3dd5 | 1900 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 1901 | { |
8c2e3dd5 KW |
1902 | BlkRwCo *rwco = opaque; |
1903 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, rwco->qiov->size); | |
1904 | } | |
e7f7d676 | 1905 | |
f5a5ca79 | 1906 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
8c2e3dd5 | 1907 | { |
f5a5ca79 | 1908 | return blk_prw(blk, offset, NULL, bytes, blk_pdiscard_entry, 0); |
1ef01253 HR |
1909 | } |
1910 | ||
1911 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1912 | int64_t pos, int size) | |
1913 | { | |
bfd18d1e KW |
1914 | int ret; |
1915 | ||
c09ba36c HR |
1916 | if (!blk_is_available(blk)) { |
1917 | return -ENOMEDIUM; | |
1918 | } | |
1919 | ||
bfd18d1e KW |
1920 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1921 | if (ret < 0) { | |
1922 | return ret; | |
1923 | } | |
1924 | ||
1925 | if (ret == size && !blk->enable_write_cache) { | |
1926 | ret = bdrv_flush(blk_bs(blk)); | |
1927 | } | |
1928 | ||
1929 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1930 | } |
1931 | ||
1932 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1933 | { | |
c09ba36c HR |
1934 | if (!blk_is_available(blk)) { |
1935 | return -ENOMEDIUM; | |
1936 | } | |
1937 | ||
f21d96d0 | 1938 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1939 | } |
f0272c4d ET |
1940 | |
1941 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1942 | { | |
c09ba36c HR |
1943 | if (!blk_is_available(blk)) { |
1944 | return -ENOMEDIUM; | |
1945 | } | |
1946 | ||
f21d96d0 | 1947 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1948 | } |
1949 | ||
1950 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1951 | { | |
c09ba36c HR |
1952 | if (!blk_is_available(blk)) { |
1953 | return -ENOMEDIUM; | |
1954 | } | |
1955 | ||
f21d96d0 | 1956 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1957 | } |
281d22d8 HR |
1958 | |
1959 | /* | |
1960 | * Updates the BlockBackendRootState object with data from the currently | |
1961 | * attached BlockDriverState. | |
1962 | */ | |
1963 | void blk_update_root_state(BlockBackend *blk) | |
1964 | { | |
f21d96d0 | 1965 | assert(blk->root); |
281d22d8 | 1966 | |
f21d96d0 KW |
1967 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1968 | blk->root_state.read_only = blk->root->bs->read_only; | |
1969 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1970 | } |
1971 | ||
38cb18f5 | 1972 | /* |
b85114f8 KW |
1973 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
1974 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 1975 | */ |
b85114f8 | 1976 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 1977 | { |
b85114f8 | 1978 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
1979 | } |
1980 | ||
1981 | /* | |
1982 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1983 | * supposed to inherit the root state. | |
1984 | */ | |
1985 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1986 | { | |
1987 | int bs_flags; | |
1988 | ||
1989 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1990 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1991 | ||
1992 | return bs_flags; | |
1993 | } | |
1994 | ||
281d22d8 HR |
1995 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1996 | { | |
1997 | return &blk->root_state; | |
1998 | } | |
1393f212 HR |
1999 | |
2000 | int blk_commit_all(void) | |
2001 | { | |
fe1a9cbc HR |
2002 | BlockBackend *blk = NULL; |
2003 | ||
2004 | while ((blk = blk_all_next(blk)) != NULL) { | |
2005 | AioContext *aio_context = blk_get_aio_context(blk); | |
2006 | ||
2007 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
2008 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
2009 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
2010 | if (ret < 0) { |
2011 | aio_context_release(aio_context); | |
2012 | return ret; | |
2013 | } | |
2014 | } | |
2015 | aio_context_release(aio_context); | |
2016 | } | |
2017 | return 0; | |
2018 | } | |
2019 | ||
97148076 KW |
2020 | |
2021 | /* throttling disk I/O limits */ | |
2022 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2023 | { | |
022cdc9f | 2024 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2025 | } |
2026 | ||
2027 | void blk_io_limits_disable(BlockBackend *blk) | |
2028 | { | |
48bf7ea8 AG |
2029 | BlockDriverState *bs = blk_bs(blk); |
2030 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2031 | assert(tgm->throttle_state); | |
2032 | if (bs) { | |
2033 | bdrv_drained_begin(bs); | |
2034 | } | |
2035 | throttle_group_unregister_tgm(tgm); | |
2036 | if (bs) { | |
2037 | bdrv_drained_end(bs); | |
2038 | } | |
97148076 KW |
2039 | } |
2040 | ||
2041 | /* should be called before blk_set_io_limits if a limit is set */ | |
2042 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2043 | { | |
022cdc9f | 2044 | assert(!blk->public.throttle_group_member.throttle_state); |
c61791fc MP |
2045 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2046 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2047 | } |
2048 | ||
2049 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2050 | { | |
2051 | /* this BB is not part of any group */ | |
022cdc9f | 2052 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2053 | return; |
2054 | } | |
2055 | ||
2056 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2057 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2058 | group)) { | |
97148076 KW |
2059 | return; |
2060 | } | |
2061 | ||
2062 | /* need to change the group this bs belong to */ | |
2063 | blk_io_limits_disable(blk); | |
2064 | blk_io_limits_enable(blk, group); | |
2065 | } | |
c2066af0 KW |
2066 | |
2067 | static void blk_root_drained_begin(BdrvChild *child) | |
2068 | { | |
2069 | BlockBackend *blk = child->opaque; | |
2070 | ||
f4d9cc88 JS |
2071 | if (++blk->quiesce_counter == 1) { |
2072 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
2073 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2074 | } | |
2075 | } | |
2076 | ||
36fe1331 KW |
2077 | /* Note that blk->root may not be accessible here yet if we are just |
2078 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2079 | ||
022cdc9f MP |
2080 | if (atomic_fetch_inc(&blk->public.throttle_group_member.io_limits_disabled) == 0) { |
2081 | throttle_group_restart_tgm(&blk->public.throttle_group_member); | |
c2066af0 KW |
2082 | } |
2083 | } | |
2084 | ||
2085 | static void blk_root_drained_end(BdrvChild *child) | |
2086 | { | |
2087 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 2088 | assert(blk->quiesce_counter); |
c2066af0 | 2089 | |
022cdc9f MP |
2090 | assert(blk->public.throttle_group_member.io_limits_disabled); |
2091 | atomic_dec(&blk->public.throttle_group_member.io_limits_disabled); | |
f4d9cc88 JS |
2092 | |
2093 | if (--blk->quiesce_counter == 0) { | |
2094 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
2095 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2096 | } | |
2097 | } | |
c2066af0 | 2098 | } |