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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" |
e688df6b | 21 | #include "qapi/error.h" |
f348b6d1 | 22 | #include "qemu/id.h" |
1e98fefd | 23 | #include "trace.h" |
5f7772c4 | 24 | #include "migration/misc.h" |
a7f53e26 MA |
25 | |
26 | /* Number of coroutines to reserve per attached device model */ | |
27 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 28 | |
1bf1cbc9 KW |
29 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
30 | ||
4981bdec HR |
31 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
32 | ||
26f54e9a MA |
33 | struct BlockBackend { |
34 | char *name; | |
35 | int refcnt; | |
f21d96d0 | 36 | BdrvChild *root; |
26f8b3a8 | 37 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 38 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 39 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 40 | BlockBackendPublic public; |
a7f53e26 MA |
41 | |
42 | void *dev; /* attached device model, if any */ | |
bbc8ea98 | 43 | bool legacy_dev; /* true if dev is not a DeviceState */ |
a7f53e26 MA |
44 | /* TODO change to DeviceState when all users are qdevified */ |
45 | const BlockDevOps *dev_ops; | |
46 | void *dev_opaque; | |
68e9ec01 HR |
47 | |
48 | /* the block size for which the guest device expects atomicity */ | |
49 | int guest_block_size; | |
7f0e9da6 | 50 | |
281d22d8 HR |
51 | /* If the BDS tree is removed, some of its options are stored here (which |
52 | * can be used to restore those options in the new BDS on insert) */ | |
53 | BlockBackendRootState root_state; | |
54 | ||
bfd18d1e KW |
55 | bool enable_write_cache; |
56 | ||
7f0e9da6 HR |
57 | /* I/O stats (display with "info blockstats"). */ |
58 | BlockAcctStats stats; | |
373340b2 HR |
59 | |
60 | BlockdevOnError on_read_error, on_write_error; | |
61 | bool iostatus_enabled; | |
62 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 63 | |
981776b3 KW |
64 | uint64_t perm; |
65 | uint64_t shared_perm; | |
d35ff5e6 | 66 | bool disable_perm; |
981776b3 | 67 | |
c10c9d96 KW |
68 | bool allow_write_beyond_eof; |
69 | ||
3301f6c6 | 70 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
f4d9cc88 JS |
71 | |
72 | int quiesce_counter; | |
5f7772c4 | 73 | VMChangeStateEntry *vmsh; |
ca2e2144 | 74 | bool force_allow_inactivate; |
26f54e9a MA |
75 | }; |
76 | ||
e7f7d676 HR |
77 | typedef struct BlockBackendAIOCB { |
78 | BlockAIOCB common; | |
4981bdec | 79 | BlockBackend *blk; |
e7f7d676 HR |
80 | int ret; |
81 | } BlockBackendAIOCB; | |
82 | ||
83 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 84 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
85 | .aiocb_size = sizeof(BlockBackendAIOCB), |
86 | }; | |
87 | ||
8fb3c76c | 88 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 89 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
8fb3c76c | 90 | |
2cf22d6a HR |
91 | /* All BlockBackends */ |
92 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
93 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
94 | ||
9492b0b9 HR |
95 | /* All BlockBackends referenced by the monitor and which are iterated through by |
96 | * blk_next() */ | |
97 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
98 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 99 | |
f21d96d0 KW |
100 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
101 | int parent_flags, QDict *parent_options) | |
102 | { | |
103 | /* We're not supposed to call this function for root nodes */ | |
104 | abort(); | |
105 | } | |
c2066af0 KW |
106 | static void blk_root_drained_begin(BdrvChild *child); |
107 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 | 108 | |
5c8cab48 KW |
109 | static void blk_root_change_media(BdrvChild *child, bool load); |
110 | static void blk_root_resize(BdrvChild *child); | |
111 | ||
b5411555 KW |
112 | static char *blk_root_get_parent_desc(BdrvChild *child) |
113 | { | |
114 | BlockBackend *blk = child->opaque; | |
115 | char *dev_id; | |
116 | ||
117 | if (blk->name) { | |
118 | return g_strdup(blk->name); | |
119 | } | |
120 | ||
121 | dev_id = blk_get_attached_dev_id(blk); | |
122 | if (*dev_id) { | |
123 | return dev_id; | |
124 | } else { | |
125 | /* TODO Callback into the BB owner for something more detailed */ | |
126 | g_free(dev_id); | |
127 | return g_strdup("a block device"); | |
128 | } | |
129 | } | |
130 | ||
4c265bf9 KW |
131 | static const char *blk_root_get_name(BdrvChild *child) |
132 | { | |
133 | return blk_name(child->opaque); | |
134 | } | |
135 | ||
5f7772c4 FZ |
136 | static void blk_vm_state_changed(void *opaque, int running, RunState state) |
137 | { | |
138 | Error *local_err = NULL; | |
139 | BlockBackend *blk = opaque; | |
140 | ||
141 | if (state == RUN_STATE_INMIGRATE) { | |
142 | return; | |
143 | } | |
144 | ||
145 | qemu_del_vm_change_state_handler(blk->vmsh); | |
146 | blk->vmsh = NULL; | |
147 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
148 | if (local_err) { | |
149 | error_report_err(local_err); | |
150 | } | |
151 | } | |
152 | ||
4417ab7a KW |
153 | /* |
154 | * Notifies the user of the BlockBackend that migration has completed. qdev | |
155 | * devices can tighten their permissions in response (specifically revoke | |
156 | * shared write permissions that we needed for storage migration). | |
157 | * | |
158 | * If an error is returned, the VM cannot be allowed to be resumed. | |
159 | */ | |
160 | static void blk_root_activate(BdrvChild *child, Error **errp) | |
161 | { | |
162 | BlockBackend *blk = child->opaque; | |
163 | Error *local_err = NULL; | |
164 | ||
165 | if (!blk->disable_perm) { | |
166 | return; | |
167 | } | |
168 | ||
169 | blk->disable_perm = false; | |
170 | ||
5f7772c4 FZ |
171 | blk_set_perm(blk, blk->perm, BLK_PERM_ALL, &local_err); |
172 | if (local_err) { | |
173 | error_propagate(errp, local_err); | |
174 | blk->disable_perm = true; | |
175 | return; | |
176 | } | |
177 | ||
178 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
179 | /* Activation can happen when migration process is still active, for | |
180 | * example when nbd_server_add is called during non-shared storage | |
181 | * migration. Defer the shared_perm update to migration completion. */ | |
182 | if (!blk->vmsh) { | |
183 | blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed, | |
184 | blk); | |
185 | } | |
186 | return; | |
187 | } | |
188 | ||
4417ab7a KW |
189 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); |
190 | if (local_err) { | |
191 | error_propagate(errp, local_err); | |
192 | blk->disable_perm = true; | |
193 | return; | |
194 | } | |
195 | } | |
196 | ||
ca2e2144 FZ |
197 | void blk_set_force_allow_inactivate(BlockBackend *blk) |
198 | { | |
199 | blk->force_allow_inactivate = true; | |
200 | } | |
201 | ||
c16de8f5 FZ |
202 | static bool blk_can_inactivate(BlockBackend *blk) |
203 | { | |
ca2e2144 | 204 | /* If it is a guest device, inactivate is ok. */ |
c16de8f5 FZ |
205 | if (blk->dev || blk_name(blk)[0]) { |
206 | return true; | |
207 | } | |
208 | ||
ca2e2144 FZ |
209 | /* Inactivating means no more writes to the image can be done, |
210 | * even if those writes would be changes invisible to the | |
211 | * guest. For block job BBs that satisfy this, we can just allow | |
212 | * it. This is the case for mirror job source, which is required | |
213 | * by libvirt non-shared block migration. */ | |
214 | if (!(blk->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED))) { | |
215 | return true; | |
216 | } | |
217 | ||
218 | return blk->force_allow_inactivate; | |
c16de8f5 FZ |
219 | } |
220 | ||
cfa1a572 KW |
221 | static int blk_root_inactivate(BdrvChild *child) |
222 | { | |
223 | BlockBackend *blk = child->opaque; | |
224 | ||
225 | if (blk->disable_perm) { | |
226 | return 0; | |
227 | } | |
228 | ||
c16de8f5 | 229 | if (!blk_can_inactivate(blk)) { |
cfa1a572 KW |
230 | return -EPERM; |
231 | } | |
232 | ||
233 | blk->disable_perm = true; | |
234 | if (blk->root) { | |
235 | bdrv_child_try_set_perm(blk->root, 0, BLK_PERM_ALL, &error_abort); | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
f21d96d0 | 241 | static const BdrvChildRole child_root = { |
c2066af0 KW |
242 | .inherit_options = blk_root_inherit_options, |
243 | ||
5c8cab48 KW |
244 | .change_media = blk_root_change_media, |
245 | .resize = blk_root_resize, | |
4c265bf9 | 246 | .get_name = blk_root_get_name, |
b5411555 | 247 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 248 | |
c2066af0 KW |
249 | .drained_begin = blk_root_drained_begin, |
250 | .drained_end = blk_root_drained_end, | |
4417ab7a KW |
251 | |
252 | .activate = blk_root_activate, | |
cfa1a572 | 253 | .inactivate = blk_root_inactivate, |
f21d96d0 KW |
254 | }; |
255 | ||
26f54e9a | 256 | /* |
efaa7c4e | 257 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
258 | * |
259 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
260 | * to request for a block driver node that is attached to this BlockBackend. | |
261 | * @shared_perm is a bitmask which describes which permissions may be granted | |
262 | * to other users of the attached node. | |
263 | * Both sets of permissions can be changed later using blk_set_perm(). | |
264 | * | |
26f54e9a MA |
265 | * Return the new BlockBackend on success, null on failure. |
266 | */ | |
6d0eb64d | 267 | BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
268 | { |
269 | BlockBackend *blk; | |
270 | ||
26f54e9a | 271 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 272 | blk->refcnt = 1; |
6d0eb64d KW |
273 | blk->perm = perm; |
274 | blk->shared_perm = shared_perm; | |
0c3169df KW |
275 | blk_set_enable_write_cache(blk, true); |
276 | ||
9caa6f3d | 277 | block_acct_init(&blk->stats); |
27ccdd52 | 278 | |
3301f6c6 HR |
279 | notifier_list_init(&blk->remove_bs_notifiers); |
280 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 281 | |
2cf22d6a | 282 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
283 | return blk; |
284 | } | |
285 | ||
7e7d56d9 | 286 | /* |
28eb9b12 | 287 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
288 | * |
289 | * Just as with bdrv_open(), after having called this function the reference to | |
290 | * @options belongs to the block layer (even on failure). | |
291 | * | |
292 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
293 | * BDS tree just by specifying the @options QDict (or @reference, | |
294 | * alternatively). At the time of adding this function, this is not possible, | |
295 | * though, so callers of this function have to be able to specify @filename and | |
296 | * @flags. | |
297 | */ | |
efaa7c4e HR |
298 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
299 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
300 | { |
301 | BlockBackend *blk; | |
28eb9b12 | 302 | BlockDriverState *bs; |
1f4ad7d3 | 303 | uint64_t perm = 0; |
c62d32f5 KW |
304 | |
305 | /* blk_new_open() is mainly used in .bdrv_create implementations and the | |
306 | * tools where sharing isn't a concern because the BDS stays private, so we | |
307 | * just request permission according to the flags. | |
308 | * | |
309 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
310 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
311 | * shouldn't hurt either. We can still share everything here because the | |
312 | * guest devices will add their own blockers if they can't share. */ | |
1f4ad7d3 KW |
313 | if ((flags & BDRV_O_NO_IO) == 0) { |
314 | perm |= BLK_PERM_CONSISTENT_READ; | |
315 | if (flags & BDRV_O_RDWR) { | |
316 | perm |= BLK_PERM_WRITE; | |
317 | } | |
c62d32f5 KW |
318 | } |
319 | if (flags & BDRV_O_RESIZE) { | |
320 | perm |= BLK_PERM_RESIZE; | |
321 | } | |
ca49a4fd | 322 | |
c62d32f5 | 323 | blk = blk_new(perm, BLK_PERM_ALL); |
5b363937 HR |
324 | bs = bdrv_open(filename, reference, options, flags, errp); |
325 | if (!bs) { | |
ca49a4fd HR |
326 | blk_unref(blk); |
327 | return NULL; | |
328 | } | |
329 | ||
d5e6f437 | 330 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
50bfbe93 FZ |
331 | perm, BLK_PERM_ALL, blk, errp); |
332 | if (!blk->root) { | |
333 | bdrv_unref(bs); | |
334 | blk_unref(blk); | |
335 | return NULL; | |
336 | } | |
72e775c7 | 337 | |
ca49a4fd HR |
338 | return blk; |
339 | } | |
340 | ||
26f54e9a MA |
341 | static void blk_delete(BlockBackend *blk) |
342 | { | |
343 | assert(!blk->refcnt); | |
e5e78550 | 344 | assert(!blk->name); |
a7f53e26 | 345 | assert(!blk->dev); |
022cdc9f | 346 | if (blk->public.throttle_group_member.throttle_state) { |
1606e4cf EB |
347 | blk_io_limits_disable(blk); |
348 | } | |
f21d96d0 | 349 | if (blk->root) { |
13855c6b | 350 | blk_remove_bs(blk); |
7e7d56d9 | 351 | } |
5f7772c4 FZ |
352 | if (blk->vmsh) { |
353 | qemu_del_vm_change_state_handler(blk->vmsh); | |
354 | blk->vmsh = NULL; | |
355 | } | |
3301f6c6 HR |
356 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
357 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
2cf22d6a | 358 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 359 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 360 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
361 | g_free(blk); |
362 | } | |
363 | ||
8fb3c76c MA |
364 | static void drive_info_del(DriveInfo *dinfo) |
365 | { | |
366 | if (!dinfo) { | |
367 | return; | |
368 | } | |
369 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
370 | g_free(dinfo->serial); |
371 | g_free(dinfo); | |
372 | } | |
373 | ||
f636ae85 AG |
374 | int blk_get_refcnt(BlockBackend *blk) |
375 | { | |
376 | return blk ? blk->refcnt : 0; | |
377 | } | |
378 | ||
26f54e9a MA |
379 | /* |
380 | * Increment @blk's reference count. | |
381 | * @blk must not be null. | |
382 | */ | |
383 | void blk_ref(BlockBackend *blk) | |
384 | { | |
385 | blk->refcnt++; | |
386 | } | |
387 | ||
388 | /* | |
389 | * Decrement @blk's reference count. | |
390 | * If this drops it to zero, destroy @blk. | |
391 | * For convenience, do nothing if @blk is null. | |
392 | */ | |
393 | void blk_unref(BlockBackend *blk) | |
394 | { | |
395 | if (blk) { | |
396 | assert(blk->refcnt > 0); | |
397 | if (!--blk->refcnt) { | |
398 | blk_delete(blk); | |
399 | } | |
400 | } | |
401 | } | |
402 | ||
2cf22d6a HR |
403 | /* |
404 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
405 | * ones which are hidden (i.e. are not referenced by the monitor). | |
406 | */ | |
a429b9b5 | 407 | BlockBackend *blk_all_next(BlockBackend *blk) |
2cf22d6a HR |
408 | { |
409 | return blk ? QTAILQ_NEXT(blk, link) | |
410 | : QTAILQ_FIRST(&block_backends); | |
411 | } | |
412 | ||
d8da3cef HR |
413 | void blk_remove_all_bs(void) |
414 | { | |
74d1b8fc | 415 | BlockBackend *blk = NULL; |
d8da3cef | 416 | |
2cf22d6a | 417 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
418 | AioContext *ctx = blk_get_aio_context(blk); |
419 | ||
420 | aio_context_acquire(ctx); | |
f21d96d0 | 421 | if (blk->root) { |
d8da3cef HR |
422 | blk_remove_bs(blk); |
423 | } | |
424 | aio_context_release(ctx); | |
425 | } | |
426 | } | |
427 | ||
26f54e9a | 428 | /* |
9492b0b9 | 429 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
430 | * If @blk is null, return the first one. |
431 | * Else, return @blk's next sibling, which may be null. | |
432 | * | |
433 | * To iterate over all BlockBackends, do | |
434 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
435 | * ... | |
436 | * } | |
437 | */ | |
438 | BlockBackend *blk_next(BlockBackend *blk) | |
439 | { | |
9492b0b9 HR |
440 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
441 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
442 | } |
443 | ||
7c8eece4 KW |
444 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
445 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 446 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 447 | { |
5e003f17 HR |
448 | BlockDriverState *bs, *old_bs; |
449 | ||
450 | /* Must be called from the main loop */ | |
451 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
981f4f57 | 452 | |
7c8eece4 KW |
453 | /* First, return all root nodes of BlockBackends. In order to avoid |
454 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
455 | * if the BB is the first one in the parent list of the BDS. */ | |
456 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
5e003f17 HR |
457 | BlockBackend *old_blk = it->blk; |
458 | ||
459 | old_bs = old_blk ? blk_bs(old_blk) : NULL; | |
460 | ||
7c8eece4 KW |
461 | do { |
462 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
463 | bs = it->blk ? blk_bs(it->blk) : NULL; |
464 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 465 | |
5e003f17 HR |
466 | if (it->blk) { |
467 | blk_ref(it->blk); | |
468 | } | |
469 | blk_unref(old_blk); | |
470 | ||
88be7b4b | 471 | if (bs) { |
5e003f17 HR |
472 | bdrv_ref(bs); |
473 | bdrv_unref(old_bs); | |
88be7b4b | 474 | return bs; |
7c8eece4 KW |
475 | } |
476 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
5e003f17 HR |
477 | } else { |
478 | old_bs = it->bs; | |
7c8eece4 KW |
479 | } |
480 | ||
481 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
482 | * BDSes that are attached to a BlockBackend here; they have been handled | |
483 | * by the above block already */ | |
981f4f57 | 484 | do { |
7c8eece4 | 485 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
486 | bs = it->bs; |
487 | } while (bs && bdrv_has_blk(bs)); | |
488 | ||
5e003f17 HR |
489 | if (bs) { |
490 | bdrv_ref(bs); | |
491 | } | |
492 | bdrv_unref(old_bs); | |
493 | ||
88be7b4b KW |
494 | return bs; |
495 | } | |
496 | ||
5e003f17 | 497 | static void bdrv_next_reset(BdrvNextIterator *it) |
88be7b4b KW |
498 | { |
499 | *it = (BdrvNextIterator) { | |
500 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
501 | }; | |
5e003f17 | 502 | } |
981f4f57 | 503 | |
5e003f17 HR |
504 | BlockDriverState *bdrv_first(BdrvNextIterator *it) |
505 | { | |
506 | bdrv_next_reset(it); | |
88be7b4b | 507 | return bdrv_next(it); |
981f4f57 HR |
508 | } |
509 | ||
5e003f17 HR |
510 | /* Must be called when aborting a bdrv_next() iteration before |
511 | * bdrv_next() returns NULL */ | |
512 | void bdrv_next_cleanup(BdrvNextIterator *it) | |
513 | { | |
514 | /* Must be called from the main loop */ | |
515 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); | |
516 | ||
517 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
518 | if (it->blk) { | |
519 | bdrv_unref(blk_bs(it->blk)); | |
520 | blk_unref(it->blk); | |
521 | } | |
522 | } else { | |
523 | bdrv_unref(it->bs); | |
524 | } | |
525 | ||
526 | bdrv_next_reset(it); | |
527 | } | |
528 | ||
e5e78550 HR |
529 | /* |
530 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
531 | * the given @name acting as the handle for the monitor. | |
532 | * Strictly for use by blockdev.c. | |
533 | * | |
534 | * @name must not be null or empty. | |
535 | * | |
536 | * Returns true on success and false on failure. In the latter case, an Error | |
537 | * object is returned through @errp. | |
538 | */ | |
539 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
540 | { | |
541 | assert(!blk->name); | |
542 | assert(name && name[0]); | |
543 | ||
544 | if (!id_wellformed(name)) { | |
545 | error_setg(errp, "Invalid device name"); | |
546 | return false; | |
547 | } | |
548 | if (blk_by_name(name)) { | |
549 | error_setg(errp, "Device with id '%s' already exists", name); | |
550 | return false; | |
551 | } | |
552 | if (bdrv_find_node(name)) { | |
553 | error_setg(errp, | |
554 | "Device name '%s' conflicts with an existing node name", | |
555 | name); | |
556 | return false; | |
557 | } | |
558 | ||
559 | blk->name = g_strdup(name); | |
560 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
561 | return true; | |
562 | } | |
563 | ||
564 | /* | |
565 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
566 | * Strictly for use by blockdev.c. | |
567 | */ | |
568 | void monitor_remove_blk(BlockBackend *blk) | |
569 | { | |
570 | if (!blk->name) { | |
571 | return; | |
572 | } | |
573 | ||
574 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
575 | g_free(blk->name); | |
576 | blk->name = NULL; | |
577 | } | |
578 | ||
26f54e9a | 579 | /* |
7e7d56d9 | 580 | * Return @blk's name, a non-null string. |
e5e78550 | 581 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a | 582 | */ |
0731a50f | 583 | const char *blk_name(const BlockBackend *blk) |
26f54e9a | 584 | { |
e5e78550 | 585 | return blk->name ?: ""; |
26f54e9a MA |
586 | } |
587 | ||
588 | /* | |
589 | * Return the BlockBackend with name @name if it exists, else null. | |
590 | * @name must not be null. | |
591 | */ | |
592 | BlockBackend *blk_by_name(const char *name) | |
593 | { | |
74d1b8fc | 594 | BlockBackend *blk = NULL; |
26f54e9a MA |
595 | |
596 | assert(name); | |
74d1b8fc | 597 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
598 | if (!strcmp(name, blk->name)) { |
599 | return blk; | |
600 | } | |
601 | } | |
602 | return NULL; | |
603 | } | |
7e7d56d9 MA |
604 | |
605 | /* | |
606 | * Return the BlockDriverState attached to @blk if any, else null. | |
607 | */ | |
608 | BlockDriverState *blk_bs(BlockBackend *blk) | |
609 | { | |
f21d96d0 | 610 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
611 | } |
612 | ||
7c8eece4 | 613 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
614 | { |
615 | BdrvChild *child; | |
616 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
617 | if (child->role == &child_root) { | |
7c8eece4 | 618 | return child->opaque; |
dde33812 KW |
619 | } |
620 | } | |
621 | ||
7c8eece4 KW |
622 | return NULL; |
623 | } | |
624 | ||
625 | /* | |
626 | * Returns true if @bs has an associated BlockBackend. | |
627 | */ | |
628 | bool bdrv_has_blk(BlockDriverState *bs) | |
629 | { | |
630 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
631 | } |
632 | ||
b6c1bae5 KW |
633 | /* |
634 | * Returns true if @bs has only BlockBackends as parents. | |
635 | */ | |
636 | bool bdrv_is_root_node(BlockDriverState *bs) | |
637 | { | |
638 | BdrvChild *c; | |
639 | ||
640 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
641 | if (c->role != &child_root) { | |
642 | return false; | |
643 | } | |
644 | } | |
645 | ||
646 | return true; | |
647 | } | |
648 | ||
18e46a03 MA |
649 | /* |
650 | * Return @blk's DriveInfo if any, else null. | |
651 | */ | |
652 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
653 | { | |
654 | return blk->legacy_dinfo; | |
655 | } | |
656 | ||
657 | /* | |
658 | * Set @blk's DriveInfo to @dinfo, and return it. | |
659 | * @blk must not have a DriveInfo set already. | |
660 | * No other BlockBackend may have the same DriveInfo set. | |
661 | */ | |
662 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
663 | { | |
664 | assert(!blk->legacy_dinfo); | |
665 | return blk->legacy_dinfo = dinfo; | |
666 | } | |
667 | ||
668 | /* | |
669 | * Return the BlockBackend with DriveInfo @dinfo. | |
670 | * It must exist. | |
671 | */ | |
672 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
673 | { | |
74d1b8fc | 674 | BlockBackend *blk = NULL; |
18e46a03 | 675 | |
74d1b8fc | 676 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
677 | if (blk->legacy_dinfo == dinfo) { |
678 | return blk; | |
679 | } | |
680 | } | |
681 | abort(); | |
682 | } | |
683 | ||
f2cd875d KW |
684 | /* |
685 | * Returns a pointer to the publicly accessible fields of @blk. | |
686 | */ | |
687 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
688 | { | |
689 | return &blk->public; | |
690 | } | |
691 | ||
692 | /* | |
693 | * Returns a BlockBackend given the associated @public fields. | |
694 | */ | |
695 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
696 | { | |
697 | return container_of(public, BlockBackend, public); | |
698 | } | |
699 | ||
1c95f7e1 HR |
700 | /* |
701 | * Disassociates the currently associated BlockDriverState from @blk. | |
702 | */ | |
703 | void blk_remove_bs(BlockBackend *blk) | |
704 | { | |
c89bcf3a | 705 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
632a7735 | 706 | BlockDriverState *bs; |
022cdc9f | 707 | |
3301f6c6 | 708 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
c89bcf3a | 709 | if (tgm->throttle_state) { |
632a7735 ZL |
710 | bs = blk_bs(blk); |
711 | bdrv_drained_begin(bs); | |
c89bcf3a AG |
712 | throttle_group_detach_aio_context(tgm); |
713 | throttle_group_attach_aio_context(tgm, qemu_get_aio_context()); | |
632a7735 | 714 | bdrv_drained_end(bs); |
a5614993 | 715 | } |
1c95f7e1 | 716 | |
7ca7f0f6 KW |
717 | blk_update_root_state(blk); |
718 | ||
f21d96d0 KW |
719 | bdrv_root_unref_child(blk->root); |
720 | blk->root = NULL; | |
1c95f7e1 HR |
721 | } |
722 | ||
0c3c36d6 HR |
723 | /* |
724 | * Associates a new BlockDriverState with @blk. | |
725 | */ | |
d7086422 | 726 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 727 | { |
c89bcf3a | 728 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
d5e6f437 | 729 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
d7086422 KW |
730 | blk->perm, blk->shared_perm, blk, errp); |
731 | if (blk->root == NULL) { | |
732 | return -EPERM; | |
733 | } | |
734 | bdrv_ref(bs); | |
3301f6c6 HR |
735 | |
736 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
c89bcf3a AG |
737 | if (tgm->throttle_state) { |
738 | throttle_group_detach_aio_context(tgm); | |
739 | throttle_group_attach_aio_context(tgm, bdrv_get_aio_context(bs)); | |
7ca7f0f6 | 740 | } |
d7086422 KW |
741 | |
742 | return 0; | |
0c3c36d6 HR |
743 | } |
744 | ||
981776b3 KW |
745 | /* |
746 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
747 | */ | |
748 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
749 | Error **errp) | |
750 | { | |
751 | int ret; | |
752 | ||
d35ff5e6 | 753 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
754 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
755 | if (ret < 0) { | |
756 | return ret; | |
757 | } | |
758 | } | |
759 | ||
760 | blk->perm = perm; | |
761 | blk->shared_perm = shared_perm; | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
887354bd KW |
766 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
767 | { | |
768 | *perm = blk->perm; | |
769 | *shared_perm = blk->shared_perm; | |
770 | } | |
771 | ||
bbc8ea98 | 772 | static int blk_do_attach_dev(BlockBackend *blk, void *dev) |
4be74634 | 773 | { |
a7f53e26 MA |
774 | if (blk->dev) { |
775 | return -EBUSY; | |
776 | } | |
d35ff5e6 KW |
777 | |
778 | /* While migration is still incoming, we don't need to apply the | |
779 | * permissions of guest device BlockBackends. We might still have a block | |
780 | * job or NBD server writing to the image for storage migration. */ | |
781 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
782 | blk->disable_perm = true; | |
783 | } | |
784 | ||
84ebe375 | 785 | blk_ref(blk); |
a7f53e26 | 786 | blk->dev = dev; |
bbc8ea98 | 787 | blk->legacy_dev = false; |
373340b2 | 788 | blk_iostatus_reset(blk); |
d35ff5e6 | 789 | |
a7f53e26 | 790 | return 0; |
4be74634 MA |
791 | } |
792 | ||
bbc8ea98 KW |
793 | /* |
794 | * Attach device model @dev to @blk. | |
795 | * Return 0 on success, -EBUSY when a device model is attached already. | |
796 | */ | |
797 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
798 | { | |
799 | return blk_do_attach_dev(blk, dev); | |
800 | } | |
801 | ||
a7f53e26 MA |
802 | /* |
803 | * Attach device model @dev to @blk. | |
804 | * @blk must not have a device model attached already. | |
805 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
806 | */ | |
bbc8ea98 | 807 | void blk_attach_dev_legacy(BlockBackend *blk, void *dev) |
4be74634 | 808 | { |
bbc8ea98 | 809 | if (blk_do_attach_dev(blk, dev) < 0) { |
a7f53e26 MA |
810 | abort(); |
811 | } | |
bbc8ea98 | 812 | blk->legacy_dev = true; |
4be74634 MA |
813 | } |
814 | ||
a7f53e26 MA |
815 | /* |
816 | * Detach device model @dev from @blk. | |
817 | * @dev must be currently attached to @blk. | |
818 | */ | |
4be74634 | 819 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 820 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 821 | { |
a7f53e26 MA |
822 | assert(blk->dev == dev); |
823 | blk->dev = NULL; | |
824 | blk->dev_ops = NULL; | |
825 | blk->dev_opaque = NULL; | |
68e9ec01 | 826 | blk->guest_block_size = 512; |
981776b3 | 827 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 828 | blk_unref(blk); |
4be74634 MA |
829 | } |
830 | ||
a7f53e26 MA |
831 | /* |
832 | * Return the device model attached to @blk if any, else null. | |
833 | */ | |
4be74634 | 834 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
835 | /* TODO change to return DeviceState * when all users are qdevified */ |
836 | { | |
837 | return blk->dev; | |
838 | } | |
839 | ||
2d76e724 KW |
840 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
841 | * device attached to the BlockBackend. */ | |
77beef83 | 842 | char *blk_get_attached_dev_id(BlockBackend *blk) |
2d76e724 KW |
843 | { |
844 | DeviceState *dev; | |
845 | ||
846 | assert(!blk->legacy_dev); | |
847 | dev = blk->dev; | |
848 | ||
849 | if (!dev) { | |
850 | return g_strdup(""); | |
851 | } else if (dev->id) { | |
852 | return g_strdup(dev->id); | |
853 | } | |
854 | return object_get_canonical_path(OBJECT(dev)); | |
855 | } | |
856 | ||
1c89e1fa KW |
857 | /* |
858 | * Return the BlockBackend which has the device model @dev attached if it | |
859 | * exists, else null. | |
860 | * | |
861 | * @dev must not be null. | |
862 | */ | |
863 | BlockBackend *blk_by_dev(void *dev) | |
864 | { | |
865 | BlockBackend *blk = NULL; | |
866 | ||
867 | assert(dev != NULL); | |
868 | while ((blk = blk_all_next(blk)) != NULL) { | |
869 | if (blk->dev == dev) { | |
870 | return blk; | |
871 | } | |
872 | } | |
873 | return NULL; | |
874 | } | |
875 | ||
a7f53e26 MA |
876 | /* |
877 | * Set @blk's device model callbacks to @ops. | |
878 | * @opaque is the opaque argument to pass to the callbacks. | |
879 | * This is for use by device models. | |
880 | */ | |
881 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
882 | void *opaque) | |
883 | { | |
bbc8ea98 | 884 | /* All drivers that use blk_set_dev_ops() are qdevified and we want to keep |
f4d9cc88 JS |
885 | * it that way, so we can assume blk->dev, if present, is a DeviceState if |
886 | * blk->dev_ops is set. Non-device users may use dev_ops without device. */ | |
bbc8ea98 KW |
887 | assert(!blk->legacy_dev); |
888 | ||
a7f53e26 MA |
889 | blk->dev_ops = ops; |
890 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
891 | |
892 | /* Are we currently quiesced? Should we enforce this right now? */ | |
893 | if (blk->quiesce_counter && ops->drained_begin) { | |
894 | ops->drained_begin(opaque); | |
895 | } | |
a7f53e26 MA |
896 | } |
897 | ||
898 | /* | |
899 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
900 | * |
901 | * If @load is true, notify of media load. This action can fail, meaning that | |
902 | * the medium cannot be loaded. @errp is set then. | |
903 | * | |
904 | * If @load is false, notify of media eject. This can never fail. | |
905 | * | |
a7f53e26 MA |
906 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
907 | */ | |
39829a01 | 908 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 MA |
909 | { |
910 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 911 | bool tray_was_open, tray_is_open; |
39829a01 | 912 | Error *local_err = NULL; |
a7f53e26 | 913 | |
2d76e724 KW |
914 | assert(!blk->legacy_dev); |
915 | ||
f1f57066 | 916 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
917 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
918 | if (local_err) { | |
919 | assert(load == true); | |
920 | error_propagate(errp, local_err); | |
921 | return; | |
922 | } | |
f1f57066 HR |
923 | tray_is_open = blk_dev_is_tray_open(blk); |
924 | ||
925 | if (tray_was_open != tray_is_open) { | |
2d76e724 KW |
926 | char *id = blk_get_attached_dev_id(blk); |
927 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open, | |
f1f57066 | 928 | &error_abort); |
2d76e724 | 929 | g_free(id); |
a7f53e26 MA |
930 | } |
931 | } | |
932 | } | |
933 | ||
5c8cab48 KW |
934 | static void blk_root_change_media(BdrvChild *child, bool load) |
935 | { | |
39829a01 | 936 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
937 | } |
938 | ||
a7f53e26 MA |
939 | /* |
940 | * Does @blk's attached device model have removable media? | |
941 | * %true if no device model is attached. | |
942 | */ | |
943 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
944 | { | |
945 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
946 | } | |
947 | ||
8f3a73bc HR |
948 | /* |
949 | * Does @blk's attached device model have a tray? | |
950 | */ | |
951 | bool blk_dev_has_tray(BlockBackend *blk) | |
952 | { | |
953 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
954 | } | |
955 | ||
a7f53e26 MA |
956 | /* |
957 | * Notify @blk's attached device model of a media eject request. | |
958 | * If @force is true, the medium is about to be yanked out forcefully. | |
959 | */ | |
960 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 961 | { |
a7f53e26 MA |
962 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
963 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
964 | } | |
4be74634 MA |
965 | } |
966 | ||
a7f53e26 MA |
967 | /* |
968 | * Does @blk's attached device model have a tray, and is it open? | |
969 | */ | |
970 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 971 | { |
8f3a73bc | 972 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
973 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
974 | } | |
975 | return false; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Does @blk's attached device model have the medium locked? | |
980 | * %false if the device model has no such lock. | |
981 | */ | |
982 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
983 | { | |
984 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
985 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
986 | } | |
987 | return false; | |
988 | } | |
989 | ||
990 | /* | |
991 | * Notify @blk's attached device model of a backend size change. | |
992 | */ | |
5c8cab48 | 993 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 994 | { |
5c8cab48 KW |
995 | BlockBackend *blk = child->opaque; |
996 | ||
a7f53e26 MA |
997 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
998 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
999 | } | |
1000 | } | |
1001 | ||
1002 | void blk_iostatus_enable(BlockBackend *blk) | |
1003 | { | |
373340b2 HR |
1004 | blk->iostatus_enabled = true; |
1005 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
1006 | } | |
1007 | ||
1008 | /* The I/O status is only enabled if the drive explicitly | |
1009 | * enables it _and_ the VM is configured to stop on errors */ | |
1010 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
1011 | { | |
1012 | return (blk->iostatus_enabled && | |
1013 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
1014 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
1015 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
1016 | } | |
1017 | ||
1018 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
1019 | { | |
1020 | return blk->iostatus; | |
1021 | } | |
1022 | ||
1023 | void blk_iostatus_disable(BlockBackend *blk) | |
1024 | { | |
1025 | blk->iostatus_enabled = false; | |
1026 | } | |
1027 | ||
1028 | void blk_iostatus_reset(BlockBackend *blk) | |
1029 | { | |
1030 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 1031 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 1032 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
1033 | if (bs && bs->job) { |
1034 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
1035 | } |
1036 | } | |
1037 | } | |
1038 | ||
1039 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
1040 | { | |
1041 | assert(blk_iostatus_is_enabled(blk)); | |
1042 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
1043 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
1044 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
1045 | } | |
4be74634 MA |
1046 | } |
1047 | ||
c10c9d96 KW |
1048 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
1049 | { | |
1050 | blk->allow_write_beyond_eof = allow; | |
1051 | } | |
1052 | ||
e7f7d676 HR |
1053 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
1054 | size_t size) | |
1055 | { | |
1056 | int64_t len; | |
1057 | ||
1058 | if (size > INT_MAX) { | |
1059 | return -EIO; | |
1060 | } | |
1061 | ||
c09ba36c | 1062 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
1063 | return -ENOMEDIUM; |
1064 | } | |
1065 | ||
e7f7d676 HR |
1066 | if (offset < 0) { |
1067 | return -EIO; | |
1068 | } | |
1069 | ||
c10c9d96 KW |
1070 | if (!blk->allow_write_beyond_eof) { |
1071 | len = blk_getlength(blk); | |
1072 | if (len < 0) { | |
1073 | return len; | |
1074 | } | |
1075 | ||
1076 | if (offset > len || len - offset < size) { | |
1077 | return -EIO; | |
1078 | } | |
e7f7d676 HR |
1079 | } |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
1e98fefd KW |
1084 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
1085 | unsigned int bytes, QEMUIOVector *qiov, | |
1086 | BdrvRequestFlags flags) | |
4be74634 | 1087 | { |
1e98fefd | 1088 | int ret; |
99723548 | 1089 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 1090 | |
99723548 | 1091 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
1092 | |
1093 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
1094 | if (ret < 0) { |
1095 | return ret; | |
1096 | } | |
1097 | ||
99723548 PB |
1098 | bdrv_inc_in_flight(bs); |
1099 | ||
441565b2 | 1100 | /* throttling disk I/O */ |
022cdc9f MP |
1101 | if (blk->public.throttle_group_member.throttle_state) { |
1102 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1103 | bytes, false); | |
441565b2 KW |
1104 | } |
1105 | ||
99723548 PB |
1106 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
1107 | bdrv_dec_in_flight(bs); | |
1108 | return ret; | |
1bf1cbc9 KW |
1109 | } |
1110 | ||
1e98fefd KW |
1111 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
1112 | unsigned int bytes, QEMUIOVector *qiov, | |
1113 | BdrvRequestFlags flags) | |
a8823a3b | 1114 | { |
bfd18d1e | 1115 | int ret; |
99723548 | 1116 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 1117 | |
99723548 | 1118 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 1119 | |
bfd18d1e | 1120 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
1121 | if (ret < 0) { |
1122 | return ret; | |
1123 | } | |
1124 | ||
99723548 | 1125 | bdrv_inc_in_flight(bs); |
441565b2 | 1126 | /* throttling disk I/O */ |
022cdc9f MP |
1127 | if (blk->public.throttle_group_member.throttle_state) { |
1128 | throttle_group_co_io_limits_intercept(&blk->public.throttle_group_member, | |
1129 | bytes, true); | |
441565b2 KW |
1130 | } |
1131 | ||
bfd18d1e KW |
1132 | if (!blk->enable_write_cache) { |
1133 | flags |= BDRV_REQ_FUA; | |
1134 | } | |
1135 | ||
99723548 PB |
1136 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
1137 | bdrv_dec_in_flight(bs); | |
1138 | return ret; | |
a8823a3b KW |
1139 | } |
1140 | ||
1bf1cbc9 KW |
1141 | typedef struct BlkRwCo { |
1142 | BlockBackend *blk; | |
1143 | int64_t offset; | |
1144 | QEMUIOVector *qiov; | |
1145 | int ret; | |
1146 | BdrvRequestFlags flags; | |
1147 | } BlkRwCo; | |
1148 | ||
1149 | static void blk_read_entry(void *opaque) | |
1150 | { | |
1151 | BlkRwCo *rwco = opaque; | |
1152 | ||
1153 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
1154 | rwco->qiov, rwco->flags); | |
1155 | } | |
1156 | ||
a8823a3b KW |
1157 | static void blk_write_entry(void *opaque) |
1158 | { | |
1159 | BlkRwCo *rwco = opaque; | |
1160 | ||
1161 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
1162 | rwco->qiov, rwco->flags); | |
1163 | } | |
1164 | ||
a55d3fba KW |
1165 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1166 | int64_t bytes, CoroutineEntry co_entry, | |
1167 | BdrvRequestFlags flags) | |
1bf1cbc9 | 1168 | { |
1bf1cbc9 KW |
1169 | QEMUIOVector qiov; |
1170 | struct iovec iov; | |
1bf1cbc9 KW |
1171 | BlkRwCo rwco; |
1172 | ||
1bf1cbc9 KW |
1173 | iov = (struct iovec) { |
1174 | .iov_base = buf, | |
a55d3fba | 1175 | .iov_len = bytes, |
1bf1cbc9 KW |
1176 | }; |
1177 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1178 | ||
1179 | rwco = (BlkRwCo) { | |
1180 | .blk = blk, | |
a55d3fba | 1181 | .offset = offset, |
1bf1cbc9 | 1182 | .qiov = &qiov, |
fc1453cd | 1183 | .flags = flags, |
1bf1cbc9 KW |
1184 | .ret = NOT_DONE, |
1185 | }; | |
1186 | ||
35f106e6 PB |
1187 | if (qemu_in_coroutine()) { |
1188 | /* Fast-path if already in coroutine context */ | |
1189 | co_entry(&rwco); | |
1190 | } else { | |
1191 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
e92f0e19 | 1192 | bdrv_coroutine_enter(blk_bs(blk), co); |
35f106e6 PB |
1193 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); |
1194 | } | |
1bf1cbc9 KW |
1195 | |
1196 | return rwco.ret; | |
4be74634 MA |
1197 | } |
1198 | ||
b7d17f9f EB |
1199 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1200 | int count) | |
4be74634 | 1201 | { |
5bd51196 KW |
1202 | int ret; |
1203 | ||
b7d17f9f | 1204 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1205 | if (ret < 0) { |
1206 | return ret; | |
1207 | } | |
1208 | ||
c2066af0 | 1209 | blk_root_drained_begin(blk->root); |
b7d17f9f | 1210 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 1211 | blk_root_drained_end(blk->root); |
5bd51196 | 1212 | return ret; |
4be74634 MA |
1213 | } |
1214 | ||
d004bd52 | 1215 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 1216 | int bytes, BdrvRequestFlags flags) |
0df89e8e | 1217 | { |
f5a5ca79 | 1218 | return blk_prw(blk, offset, NULL, bytes, blk_write_entry, |
983a1600 | 1219 | flags | BDRV_REQ_ZERO_WRITE); |
0df89e8e KW |
1220 | } |
1221 | ||
720ff280 KW |
1222 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1223 | { | |
1224 | return bdrv_make_zero(blk->root, flags); | |
1225 | } | |
1226 | ||
e7f7d676 HR |
1227 | static void error_callback_bh(void *opaque) |
1228 | { | |
1229 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 PB |
1230 | |
1231 | bdrv_dec_in_flight(acb->common.bs); | |
e7f7d676 HR |
1232 | acb->common.cb(acb->common.opaque, acb->ret); |
1233 | qemu_aio_unref(acb); | |
1234 | } | |
1235 | ||
ca78ecfa PL |
1236 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1237 | BlockCompletionFunc *cb, | |
1238 | void *opaque, int ret) | |
e7f7d676 HR |
1239 | { |
1240 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 1241 | |
99723548 | 1242 | bdrv_inc_in_flight(blk_bs(blk)); |
e7f7d676 | 1243 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1244 | acb->blk = blk; |
e7f7d676 HR |
1245 | acb->ret = ret; |
1246 | ||
fffb6e12 | 1247 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
1248 | return &acb->common; |
1249 | } | |
1250 | ||
57d6a428 KW |
1251 | typedef struct BlkAioEmAIOCB { |
1252 | BlockAIOCB common; | |
1253 | BlkRwCo rwco; | |
7fa84cd8 | 1254 | int bytes; |
57d6a428 | 1255 | bool has_returned; |
57d6a428 KW |
1256 | } BlkAioEmAIOCB; |
1257 | ||
1258 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1259 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1260 | }; | |
1261 | ||
1262 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1263 | { | |
57d6a428 | 1264 | if (acb->has_returned) { |
99723548 | 1265 | bdrv_dec_in_flight(acb->common.bs); |
57d6a428 KW |
1266 | acb->common.cb(acb->common.opaque, acb->rwco.ret); |
1267 | qemu_aio_unref(acb); | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | static void blk_aio_complete_bh(void *opaque) | |
1272 | { | |
fffb6e12 | 1273 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1274 | assert(acb->has_returned); |
1275 | blk_aio_complete(acb); | |
57d6a428 KW |
1276 | } |
1277 | ||
7fa84cd8 | 1278 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
1279 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
1280 | BdrvRequestFlags flags, | |
1281 | BlockCompletionFunc *cb, void *opaque) | |
1282 | { | |
1283 | BlkAioEmAIOCB *acb; | |
1284 | Coroutine *co; | |
1285 | ||
99723548 | 1286 | bdrv_inc_in_flight(blk_bs(blk)); |
57d6a428 KW |
1287 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1288 | acb->rwco = (BlkRwCo) { | |
1289 | .blk = blk, | |
1290 | .offset = offset, | |
1291 | .qiov = qiov, | |
1292 | .flags = flags, | |
1293 | .ret = NOT_DONE, | |
1294 | }; | |
7fa84cd8 | 1295 | acb->bytes = bytes; |
57d6a428 KW |
1296 | acb->has_returned = false; |
1297 | ||
0b8b8753 | 1298 | co = qemu_coroutine_create(co_entry, acb); |
e92f0e19 | 1299 | bdrv_coroutine_enter(blk_bs(blk), co); |
57d6a428 KW |
1300 | |
1301 | acb->has_returned = true; | |
1302 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1303 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1304 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1305 | } |
1306 | ||
1307 | return &acb->common; | |
1308 | } | |
1309 | ||
1310 | static void blk_aio_read_entry(void *opaque) | |
1311 | { | |
1312 | BlkAioEmAIOCB *acb = opaque; | |
1313 | BlkRwCo *rwco = &acb->rwco; | |
1314 | ||
7fa84cd8 KW |
1315 | assert(rwco->qiov->size == acb->bytes); |
1316 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1317 | rwco->qiov, rwco->flags); |
1318 | blk_aio_complete(acb); | |
1319 | } | |
1320 | ||
1321 | static void blk_aio_write_entry(void *opaque) | |
1322 | { | |
1323 | BlkAioEmAIOCB *acb = opaque; | |
1324 | BlkRwCo *rwco = &acb->rwco; | |
1325 | ||
7fa84cd8 KW |
1326 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
1327 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1328 | rwco->qiov, rwco->flags); |
1329 | blk_aio_complete(acb); | |
1330 | } | |
1331 | ||
d004bd52 EB |
1332 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1333 | int count, BdrvRequestFlags flags, | |
1334 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1335 | { |
983a1600 EB |
1336 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1337 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1338 | } |
1339 | ||
1340 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1341 | { | |
a55d3fba | 1342 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1343 | if (ret < 0) { |
1344 | return ret; | |
1345 | } | |
a55d3fba | 1346 | return count; |
4be74634 MA |
1347 | } |
1348 | ||
8341f00d EB |
1349 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1350 | BdrvRequestFlags flags) | |
4be74634 | 1351 | { |
8341f00d EB |
1352 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1353 | flags); | |
e7f7d676 HR |
1354 | if (ret < 0) { |
1355 | return ret; | |
1356 | } | |
a55d3fba | 1357 | return count; |
4be74634 MA |
1358 | } |
1359 | ||
1360 | int64_t blk_getlength(BlockBackend *blk) | |
1361 | { | |
c09ba36c HR |
1362 | if (!blk_is_available(blk)) { |
1363 | return -ENOMEDIUM; | |
1364 | } | |
1365 | ||
f21d96d0 | 1366 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1367 | } |
1368 | ||
1369 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1370 | { | |
f21d96d0 | 1371 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1372 | *nb_sectors_ptr = 0; |
1373 | } else { | |
f21d96d0 | 1374 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1375 | } |
4be74634 MA |
1376 | } |
1377 | ||
1ef01253 HR |
1378 | int64_t blk_nb_sectors(BlockBackend *blk) |
1379 | { | |
c09ba36c HR |
1380 | if (!blk_is_available(blk)) { |
1381 | return -ENOMEDIUM; | |
1382 | } | |
1383 | ||
f21d96d0 | 1384 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1385 | } |
1386 | ||
60cb2fa7 EB |
1387 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1388 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1389 | BlockCompletionFunc *cb, void *opaque) | |
1390 | { | |
1391 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1392 | blk_aio_read_entry, flags, cb, opaque); | |
1393 | } | |
1394 | ||
60cb2fa7 EB |
1395 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1396 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1397 | BlockCompletionFunc *cb, void *opaque) | |
1398 | { | |
1399 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1400 | blk_aio_write_entry, flags, cb, opaque); | |
1401 | } | |
1402 | ||
be07a889 KW |
1403 | static void blk_aio_flush_entry(void *opaque) |
1404 | { | |
1405 | BlkAioEmAIOCB *acb = opaque; | |
1406 | BlkRwCo *rwco = &acb->rwco; | |
1407 | ||
1408 | rwco->ret = blk_co_flush(rwco->blk); | |
1409 | blk_aio_complete(acb); | |
1410 | } | |
1411 | ||
4be74634 MA |
1412 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1413 | BlockCompletionFunc *cb, void *opaque) | |
1414 | { | |
be07a889 | 1415 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1416 | } |
1417 | ||
8c2e3dd5 KW |
1418 | static void blk_aio_pdiscard_entry(void *opaque) |
1419 | { | |
1420 | BlkAioEmAIOCB *acb = opaque; | |
1421 | BlkRwCo *rwco = &acb->rwco; | |
1422 | ||
1423 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1424 | blk_aio_complete(acb); | |
1425 | } | |
1426 | ||
1c6c4bb7 | 1427 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
f5a5ca79 | 1428 | int64_t offset, int bytes, |
1c6c4bb7 | 1429 | BlockCompletionFunc *cb, void *opaque) |
4be74634 | 1430 | { |
f5a5ca79 | 1431 | return blk_aio_prwv(blk, offset, bytes, NULL, blk_aio_pdiscard_entry, 0, |
8c2e3dd5 | 1432 | cb, opaque); |
4be74634 MA |
1433 | } |
1434 | ||
1435 | void blk_aio_cancel(BlockAIOCB *acb) | |
1436 | { | |
1437 | bdrv_aio_cancel(acb); | |
1438 | } | |
1439 | ||
1440 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1441 | { | |
1442 | bdrv_aio_cancel_async(acb); | |
1443 | } | |
1444 | ||
48af776a | 1445 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1446 | { |
c09ba36c HR |
1447 | if (!blk_is_available(blk)) { |
1448 | return -ENOMEDIUM; | |
1449 | } | |
1450 | ||
48af776a KW |
1451 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1452 | } | |
1453 | ||
1454 | static void blk_ioctl_entry(void *opaque) | |
1455 | { | |
1456 | BlkRwCo *rwco = opaque; | |
1457 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1458 | rwco->qiov->iov[0].iov_base); | |
1459 | } | |
1460 | ||
1461 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1462 | { | |
1463 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1464 | } | |
1465 | ||
1466 | static void blk_aio_ioctl_entry(void *opaque) | |
1467 | { | |
1468 | BlkAioEmAIOCB *acb = opaque; | |
1469 | BlkRwCo *rwco = &acb->rwco; | |
1470 | ||
1471 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1472 | rwco->qiov->iov[0].iov_base); | |
1473 | blk_aio_complete(acb); | |
4be74634 MA |
1474 | } |
1475 | ||
1476 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1477 | BlockCompletionFunc *cb, void *opaque) | |
1478 | { | |
48af776a KW |
1479 | QEMUIOVector qiov; |
1480 | struct iovec iov; | |
1481 | ||
1482 | iov = (struct iovec) { | |
1483 | .iov_base = buf, | |
1484 | .iov_len = 0, | |
1485 | }; | |
1486 | qemu_iovec_init_external(&qiov, &iov, 1); | |
c09ba36c | 1487 | |
48af776a | 1488 | return blk_aio_prwv(blk, req, 0, &qiov, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1489 | } |
1490 | ||
f5a5ca79 | 1491 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
2bb0dce7 | 1492 | { |
f5a5ca79 | 1493 | int ret = blk_check_byte_request(blk, offset, bytes); |
e7f7d676 HR |
1494 | if (ret < 0) { |
1495 | return ret; | |
1496 | } | |
1497 | ||
f5a5ca79 | 1498 | return bdrv_co_pdiscard(blk_bs(blk), offset, bytes); |
2bb0dce7 HR |
1499 | } |
1500 | ||
1501 | int blk_co_flush(BlockBackend *blk) | |
1502 | { | |
c09ba36c HR |
1503 | if (!blk_is_available(blk)) { |
1504 | return -ENOMEDIUM; | |
1505 | } | |
1506 | ||
f21d96d0 | 1507 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1508 | } |
1509 | ||
be07a889 | 1510 | static void blk_flush_entry(void *opaque) |
4be74634 | 1511 | { |
be07a889 KW |
1512 | BlkRwCo *rwco = opaque; |
1513 | rwco->ret = blk_co_flush(rwco->blk); | |
1514 | } | |
c09ba36c | 1515 | |
be07a889 KW |
1516 | int blk_flush(BlockBackend *blk) |
1517 | { | |
1518 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1519 | } |
1520 | ||
97b0385a AY |
1521 | void blk_drain(BlockBackend *blk) |
1522 | { | |
f21d96d0 KW |
1523 | if (blk_bs(blk)) { |
1524 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1525 | } |
97b0385a AY |
1526 | } |
1527 | ||
4be74634 MA |
1528 | void blk_drain_all(void) |
1529 | { | |
1530 | bdrv_drain_all(); | |
1531 | } | |
1532 | ||
373340b2 HR |
1533 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1534 | BlockdevOnError on_write_error) | |
1535 | { | |
1536 | blk->on_read_error = on_read_error; | |
1537 | blk->on_write_error = on_write_error; | |
1538 | } | |
1539 | ||
4be74634 MA |
1540 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1541 | { | |
373340b2 | 1542 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1543 | } |
1544 | ||
1545 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1546 | int error) | |
1547 | { | |
373340b2 HR |
1548 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1549 | ||
1550 | switch (on_err) { | |
1551 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1552 | return (error == ENOSPC) ? | |
1553 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1554 | case BLOCKDEV_ON_ERROR_STOP: | |
1555 | return BLOCK_ERROR_ACTION_STOP; | |
1556 | case BLOCKDEV_ON_ERROR_REPORT: | |
1557 | return BLOCK_ERROR_ACTION_REPORT; | |
1558 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1559 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1560 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1561 | default: |
1562 | abort(); | |
1563 | } | |
4be74634 MA |
1564 | } |
1565 | ||
373340b2 HR |
1566 | static void send_qmp_error_event(BlockBackend *blk, |
1567 | BlockErrorAction action, | |
1568 | bool is_read, int error) | |
1569 | { | |
1570 | IoOperationType optype; | |
1571 | ||
1572 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
2bf7e10f KW |
1573 | qapi_event_send_block_io_error(blk_name(blk), |
1574 | bdrv_get_node_name(blk_bs(blk)), optype, | |
1575 | action, blk_iostatus_is_enabled(blk), | |
373340b2 HR |
1576 | error == ENOSPC, strerror(error), |
1577 | &error_abort); | |
1578 | } | |
1579 | ||
1580 | /* This is done by device models because, while the block layer knows | |
1581 | * about the error, it does not know whether an operation comes from | |
1582 | * the device or the block layer (from a job, for example). | |
1583 | */ | |
4be74634 MA |
1584 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1585 | bool is_read, int error) | |
1586 | { | |
373340b2 HR |
1587 | assert(error >= 0); |
1588 | ||
1589 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1590 | /* First set the iostatus, so that "info block" returns an iostatus | |
1591 | * that matches the events raised so far (an additional error iostatus | |
1592 | * is fine, but not a lost one). | |
1593 | */ | |
1594 | blk_iostatus_set_err(blk, error); | |
1595 | ||
1596 | /* Then raise the request to stop the VM and the event. | |
1597 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1598 | * it ensures that the STOP event always comes after the | |
1599 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1600 | * can observe the STOP event and do a "cont" before the STOP | |
1601 | * event is issued, the VM will not stop. In this case, vm_start() | |
1602 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1603 | */ | |
1604 | qemu_system_vmstop_request_prepare(); | |
1605 | send_qmp_error_event(blk, action, is_read, error); | |
1606 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1607 | } else { | |
1608 | send_qmp_error_event(blk, action, is_read, error); | |
1609 | } | |
4be74634 MA |
1610 | } |
1611 | ||
1612 | int blk_is_read_only(BlockBackend *blk) | |
1613 | { | |
f21d96d0 KW |
1614 | BlockDriverState *bs = blk_bs(blk); |
1615 | ||
1616 | if (bs) { | |
1617 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1618 | } else { |
1619 | return blk->root_state.read_only; | |
1620 | } | |
4be74634 MA |
1621 | } |
1622 | ||
1623 | int blk_is_sg(BlockBackend *blk) | |
1624 | { | |
f21d96d0 KW |
1625 | BlockDriverState *bs = blk_bs(blk); |
1626 | ||
1627 | if (!bs) { | |
a46fc9c9 HR |
1628 | return 0; |
1629 | } | |
1630 | ||
f21d96d0 | 1631 | return bdrv_is_sg(bs); |
4be74634 MA |
1632 | } |
1633 | ||
1634 | int blk_enable_write_cache(BlockBackend *blk) | |
1635 | { | |
bfd18d1e | 1636 | return blk->enable_write_cache; |
4be74634 MA |
1637 | } |
1638 | ||
1639 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1640 | { | |
bfd18d1e | 1641 | blk->enable_write_cache = wce; |
4be74634 MA |
1642 | } |
1643 | ||
2bb0dce7 HR |
1644 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1645 | { | |
f21d96d0 KW |
1646 | BlockDriverState *bs = blk_bs(blk); |
1647 | ||
1648 | if (!bs) { | |
c09ba36c HR |
1649 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1650 | return; | |
1651 | } | |
1652 | ||
f21d96d0 | 1653 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1654 | } |
1655 | ||
e031f750 | 1656 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1657 | { |
f21d96d0 KW |
1658 | BlockDriverState *bs = blk_bs(blk); |
1659 | ||
1660 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1661 | } |
1662 | ||
1663 | bool blk_is_available(BlockBackend *blk) | |
1664 | { | |
1665 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1666 | } |
1667 | ||
1668 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1669 | { | |
f21d96d0 KW |
1670 | BlockDriverState *bs = blk_bs(blk); |
1671 | ||
1672 | if (bs) { | |
1673 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1674 | } |
4be74634 MA |
1675 | } |
1676 | ||
1677 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1678 | { | |
f21d96d0 | 1679 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1680 | char *id; |
1681 | ||
1682 | /* blk_eject is only called by qdevified devices */ | |
1683 | assert(!blk->legacy_dev); | |
f21d96d0 KW |
1684 | |
1685 | if (bs) { | |
1686 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1687 | } |
c47ee043 JS |
1688 | |
1689 | /* Whether or not we ejected on the backend, | |
1690 | * the frontend experienced a tray event. */ | |
1691 | id = blk_get_attached_dev_id(blk); | |
1692 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
1693 | eject_flag, &error_abort); | |
1694 | g_free(id); | |
4be74634 MA |
1695 | } |
1696 | ||
1697 | int blk_get_flags(BlockBackend *blk) | |
1698 | { | |
f21d96d0 KW |
1699 | BlockDriverState *bs = blk_bs(blk); |
1700 | ||
1701 | if (bs) { | |
1702 | return bdrv_get_flags(bs); | |
061959e8 HR |
1703 | } else { |
1704 | return blk->root_state.open_flags; | |
1705 | } | |
4be74634 MA |
1706 | } |
1707 | ||
5def6b80 EB |
1708 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1709 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1710 | { |
f21d96d0 | 1711 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1712 | uint32_t max = 0; |
f21d96d0 KW |
1713 | |
1714 | if (bs) { | |
5def6b80 | 1715 | max = bs->bl.max_transfer; |
a46fc9c9 | 1716 | } |
5def6b80 | 1717 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1718 | } |
1719 | ||
648296e0 SH |
1720 | int blk_get_max_iov(BlockBackend *blk) |
1721 | { | |
f21d96d0 | 1722 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1723 | } |
1724 | ||
4be74634 MA |
1725 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1726 | { | |
68e9ec01 | 1727 | blk->guest_block_size = align; |
4be74634 MA |
1728 | } |
1729 | ||
f1c17521 PB |
1730 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1731 | { | |
f21d96d0 | 1732 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1733 | } |
1734 | ||
4be74634 MA |
1735 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1736 | { | |
f21d96d0 | 1737 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1738 | } |
1739 | ||
1740 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1741 | { | |
f21d96d0 KW |
1742 | BlockDriverState *bs = blk_bs(blk); |
1743 | ||
1744 | if (!bs) { | |
a46fc9c9 HR |
1745 | return false; |
1746 | } | |
1747 | ||
f21d96d0 | 1748 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1749 | } |
1750 | ||
1751 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1752 | { | |
f21d96d0 KW |
1753 | BlockDriverState *bs = blk_bs(blk); |
1754 | ||
1755 | if (bs) { | |
1756 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1757 | } |
4be74634 MA |
1758 | } |
1759 | ||
1760 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1761 | { | |
f21d96d0 KW |
1762 | BlockDriverState *bs = blk_bs(blk); |
1763 | ||
1764 | if (bs) { | |
1765 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1766 | } |
4be74634 MA |
1767 | } |
1768 | ||
1769 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1770 | { | |
f21d96d0 KW |
1771 | BlockDriverState *bs = blk_bs(blk); |
1772 | ||
1773 | if (bs) { | |
1774 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1775 | } |
4be74634 MA |
1776 | } |
1777 | ||
1778 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1779 | { | |
f21d96d0 KW |
1780 | BlockDriverState *bs = blk_bs(blk); |
1781 | ||
1782 | if (bs) { | |
1783 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1784 | } else { |
1785 | return qemu_get_aio_context(); | |
1786 | } | |
1787 | } | |
1788 | ||
1789 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1790 | { | |
1791 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1792 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1793 | } |
1794 | ||
1795 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1796 | { | |
f21d96d0 | 1797 | BlockDriverState *bs = blk_bs(blk); |
c61791fc | 1798 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; |
f21d96d0 KW |
1799 | |
1800 | if (bs) { | |
c61791fc | 1801 | if (tgm->throttle_state) { |
dc868fb0 | 1802 | bdrv_drained_begin(bs); |
c61791fc MP |
1803 | throttle_group_detach_aio_context(tgm); |
1804 | throttle_group_attach_aio_context(tgm, new_context); | |
dc868fb0 | 1805 | bdrv_drained_end(bs); |
7ca7f0f6 | 1806 | } |
f21d96d0 | 1807 | bdrv_set_aio_context(bs, new_context); |
a46fc9c9 | 1808 | } |
4be74634 MA |
1809 | } |
1810 | ||
2019ba0a HR |
1811 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1812 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1813 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1814 | { | |
f21d96d0 KW |
1815 | BlockDriverState *bs = blk_bs(blk); |
1816 | ||
1817 | if (bs) { | |
1818 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1819 | detach_aio_context, opaque); |
1820 | } | |
2019ba0a HR |
1821 | } |
1822 | ||
1823 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1824 | void (*attached_aio_context)(AioContext *, | |
1825 | void *), | |
1826 | void (*detach_aio_context)(void *), | |
1827 | void *opaque) | |
1828 | { | |
f21d96d0 KW |
1829 | BlockDriverState *bs = blk_bs(blk); |
1830 | ||
1831 | if (bs) { | |
1832 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1833 | detach_aio_context, opaque); |
1834 | } | |
2019ba0a HR |
1835 | } |
1836 | ||
3301f6c6 HR |
1837 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1838 | { | |
1839 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1840 | } | |
1841 | ||
1842 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1843 | { | |
1844 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1845 | } | |
1846 | ||
4be74634 MA |
1847 | void blk_io_plug(BlockBackend *blk) |
1848 | { | |
f21d96d0 KW |
1849 | BlockDriverState *bs = blk_bs(blk); |
1850 | ||
1851 | if (bs) { | |
1852 | bdrv_io_plug(bs); | |
a46fc9c9 | 1853 | } |
4be74634 MA |
1854 | } |
1855 | ||
1856 | void blk_io_unplug(BlockBackend *blk) | |
1857 | { | |
f21d96d0 KW |
1858 | BlockDriverState *bs = blk_bs(blk); |
1859 | ||
1860 | if (bs) { | |
1861 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1862 | } |
4be74634 MA |
1863 | } |
1864 | ||
1865 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1866 | { | |
7f0e9da6 | 1867 | return &blk->stats; |
4be74634 MA |
1868 | } |
1869 | ||
1870 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1871 | BlockCompletionFunc *cb, void *opaque) | |
1872 | { | |
1873 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1874 | } | |
1ef01253 | 1875 | |
d004bd52 | 1876 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
f5a5ca79 | 1877 | int bytes, BdrvRequestFlags flags) |
1ef01253 | 1878 | { |
f5a5ca79 | 1879 | return blk_co_pwritev(blk, offset, bytes, NULL, |
16aaf975 | 1880 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1881 | } |
1882 | ||
fe5c1355 PB |
1883 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1884 | int count) | |
1ef01253 | 1885 | { |
35fadca8 PB |
1886 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1887 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
1888 | } |
1889 | ||
3a691c50 HR |
1890 | int blk_truncate(BlockBackend *blk, int64_t offset, PreallocMode prealloc, |
1891 | Error **errp) | |
1ef01253 | 1892 | { |
c09ba36c | 1893 | if (!blk_is_available(blk)) { |
ed3d2ec9 | 1894 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
1895 | return -ENOMEDIUM; |
1896 | } | |
1897 | ||
3a691c50 | 1898 | return bdrv_truncate(blk->root, offset, prealloc, errp); |
1ef01253 HR |
1899 | } |
1900 | ||
8c2e3dd5 | 1901 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 1902 | { |
8c2e3dd5 KW |
1903 | BlkRwCo *rwco = opaque; |
1904 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, rwco->qiov->size); | |
1905 | } | |
e7f7d676 | 1906 | |
f5a5ca79 | 1907 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int bytes) |
8c2e3dd5 | 1908 | { |
f5a5ca79 | 1909 | return blk_prw(blk, offset, NULL, bytes, blk_pdiscard_entry, 0); |
1ef01253 HR |
1910 | } |
1911 | ||
1912 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1913 | int64_t pos, int size) | |
1914 | { | |
bfd18d1e KW |
1915 | int ret; |
1916 | ||
c09ba36c HR |
1917 | if (!blk_is_available(blk)) { |
1918 | return -ENOMEDIUM; | |
1919 | } | |
1920 | ||
bfd18d1e KW |
1921 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1922 | if (ret < 0) { | |
1923 | return ret; | |
1924 | } | |
1925 | ||
1926 | if (ret == size && !blk->enable_write_cache) { | |
1927 | ret = bdrv_flush(blk_bs(blk)); | |
1928 | } | |
1929 | ||
1930 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1931 | } |
1932 | ||
1933 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1934 | { | |
c09ba36c HR |
1935 | if (!blk_is_available(blk)) { |
1936 | return -ENOMEDIUM; | |
1937 | } | |
1938 | ||
f21d96d0 | 1939 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1940 | } |
f0272c4d ET |
1941 | |
1942 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1943 | { | |
c09ba36c HR |
1944 | if (!blk_is_available(blk)) { |
1945 | return -ENOMEDIUM; | |
1946 | } | |
1947 | ||
f21d96d0 | 1948 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1949 | } |
1950 | ||
1951 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1952 | { | |
c09ba36c HR |
1953 | if (!blk_is_available(blk)) { |
1954 | return -ENOMEDIUM; | |
1955 | } | |
1956 | ||
f21d96d0 | 1957 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1958 | } |
281d22d8 HR |
1959 | |
1960 | /* | |
1961 | * Updates the BlockBackendRootState object with data from the currently | |
1962 | * attached BlockDriverState. | |
1963 | */ | |
1964 | void blk_update_root_state(BlockBackend *blk) | |
1965 | { | |
f21d96d0 | 1966 | assert(blk->root); |
281d22d8 | 1967 | |
f21d96d0 KW |
1968 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1969 | blk->root_state.read_only = blk->root->bs->read_only; | |
1970 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1971 | } |
1972 | ||
38cb18f5 | 1973 | /* |
b85114f8 KW |
1974 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
1975 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 1976 | */ |
b85114f8 | 1977 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 1978 | { |
b85114f8 | 1979 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
1980 | } |
1981 | ||
1982 | /* | |
1983 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1984 | * supposed to inherit the root state. | |
1985 | */ | |
1986 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1987 | { | |
1988 | int bs_flags; | |
1989 | ||
1990 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1991 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1992 | ||
1993 | return bs_flags; | |
1994 | } | |
1995 | ||
281d22d8 HR |
1996 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1997 | { | |
1998 | return &blk->root_state; | |
1999 | } | |
1393f212 HR |
2000 | |
2001 | int blk_commit_all(void) | |
2002 | { | |
fe1a9cbc HR |
2003 | BlockBackend *blk = NULL; |
2004 | ||
2005 | while ((blk = blk_all_next(blk)) != NULL) { | |
2006 | AioContext *aio_context = blk_get_aio_context(blk); | |
2007 | ||
2008 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
2009 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
2010 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
2011 | if (ret < 0) { |
2012 | aio_context_release(aio_context); | |
2013 | return ret; | |
2014 | } | |
2015 | } | |
2016 | aio_context_release(aio_context); | |
2017 | } | |
2018 | return 0; | |
2019 | } | |
2020 | ||
97148076 KW |
2021 | |
2022 | /* throttling disk I/O limits */ | |
2023 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
2024 | { | |
022cdc9f | 2025 | throttle_group_config(&blk->public.throttle_group_member, cfg); |
97148076 KW |
2026 | } |
2027 | ||
2028 | void blk_io_limits_disable(BlockBackend *blk) | |
2029 | { | |
48bf7ea8 AG |
2030 | BlockDriverState *bs = blk_bs(blk); |
2031 | ThrottleGroupMember *tgm = &blk->public.throttle_group_member; | |
2032 | assert(tgm->throttle_state); | |
2033 | if (bs) { | |
2034 | bdrv_drained_begin(bs); | |
2035 | } | |
2036 | throttle_group_unregister_tgm(tgm); | |
2037 | if (bs) { | |
2038 | bdrv_drained_end(bs); | |
2039 | } | |
97148076 KW |
2040 | } |
2041 | ||
2042 | /* should be called before blk_set_io_limits if a limit is set */ | |
2043 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
2044 | { | |
022cdc9f | 2045 | assert(!blk->public.throttle_group_member.throttle_state); |
c61791fc MP |
2046 | throttle_group_register_tgm(&blk->public.throttle_group_member, |
2047 | group, blk_get_aio_context(blk)); | |
97148076 KW |
2048 | } |
2049 | ||
2050 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
2051 | { | |
2052 | /* this BB is not part of any group */ | |
022cdc9f | 2053 | if (!blk->public.throttle_group_member.throttle_state) { |
97148076 KW |
2054 | return; |
2055 | } | |
2056 | ||
2057 | /* this BB is a part of the same group than the one we want */ | |
022cdc9f MP |
2058 | if (!g_strcmp0(throttle_group_get_name(&blk->public.throttle_group_member), |
2059 | group)) { | |
97148076 KW |
2060 | return; |
2061 | } | |
2062 | ||
2063 | /* need to change the group this bs belong to */ | |
2064 | blk_io_limits_disable(blk); | |
2065 | blk_io_limits_enable(blk, group); | |
2066 | } | |
c2066af0 KW |
2067 | |
2068 | static void blk_root_drained_begin(BdrvChild *child) | |
2069 | { | |
2070 | BlockBackend *blk = child->opaque; | |
2071 | ||
f4d9cc88 JS |
2072 | if (++blk->quiesce_counter == 1) { |
2073 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
2074 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
2075 | } | |
2076 | } | |
2077 | ||
36fe1331 KW |
2078 | /* Note that blk->root may not be accessible here yet if we are just |
2079 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
2080 | ||
022cdc9f MP |
2081 | if (atomic_fetch_inc(&blk->public.throttle_group_member.io_limits_disabled) == 0) { |
2082 | throttle_group_restart_tgm(&blk->public.throttle_group_member); | |
c2066af0 KW |
2083 | } |
2084 | } | |
2085 | ||
2086 | static void blk_root_drained_end(BdrvChild *child) | |
2087 | { | |
2088 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 2089 | assert(blk->quiesce_counter); |
c2066af0 | 2090 | |
022cdc9f MP |
2091 | assert(blk->public.throttle_group_member.io_limits_disabled); |
2092 | atomic_dec(&blk->public.throttle_group_member.io_limits_disabled); | |
f4d9cc88 JS |
2093 | |
2094 | if (--blk->quiesce_counter == 0) { | |
2095 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
2096 | blk->dev_ops->drained_end(blk->dev_opaque); | |
2097 | } | |
2098 | } | |
c2066af0 | 2099 | } |
23d0ba93 FZ |
2100 | |
2101 | void blk_register_buf(BlockBackend *blk, void *host, size_t size) | |
2102 | { | |
2103 | bdrv_register_buf(blk_bs(blk), host, size); | |
2104 | } | |
2105 | ||
2106 | void blk_unregister_buf(BlockBackend *blk, void *host) | |
2107 | { | |
2108 | bdrv_unregister_buf(blk_bs(blk), host); | |
2109 | } |