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