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