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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" |
a7f53e26 MA |
23 | |
24 | /* Number of coroutines to reserve per attached device model */ | |
25 | #define COROUTINE_POOL_RESERVATION 64 | |
26f54e9a | 26 | |
1bf1cbc9 KW |
27 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
28 | ||
4981bdec HR |
29 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb); |
30 | ||
26f54e9a MA |
31 | struct BlockBackend { |
32 | char *name; | |
33 | int refcnt; | |
f21d96d0 | 34 | BdrvChild *root; |
26f8b3a8 | 35 | DriveInfo *legacy_dinfo; /* null unless created by drive_new() */ |
2cf22d6a | 36 | QTAILQ_ENTRY(BlockBackend) link; /* for block_backends */ |
9492b0b9 | 37 | QTAILQ_ENTRY(BlockBackend) monitor_link; /* for monitor_block_backends */ |
f2cd875d | 38 | BlockBackendPublic public; |
a7f53e26 MA |
39 | |
40 | void *dev; /* attached device model, if any */ | |
bbc8ea98 | 41 | bool legacy_dev; /* true if dev is not a DeviceState */ |
a7f53e26 MA |
42 | /* TODO change to DeviceState when all users are qdevified */ |
43 | const BlockDevOps *dev_ops; | |
44 | void *dev_opaque; | |
68e9ec01 HR |
45 | |
46 | /* the block size for which the guest device expects atomicity */ | |
47 | int guest_block_size; | |
7f0e9da6 | 48 | |
281d22d8 HR |
49 | /* If the BDS tree is removed, some of its options are stored here (which |
50 | * can be used to restore those options in the new BDS on insert) */ | |
51 | BlockBackendRootState root_state; | |
52 | ||
bfd18d1e KW |
53 | bool enable_write_cache; |
54 | ||
7f0e9da6 HR |
55 | /* I/O stats (display with "info blockstats"). */ |
56 | BlockAcctStats stats; | |
373340b2 HR |
57 | |
58 | BlockdevOnError on_read_error, on_write_error; | |
59 | bool iostatus_enabled; | |
60 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 61 | |
981776b3 KW |
62 | uint64_t perm; |
63 | uint64_t shared_perm; | |
d35ff5e6 | 64 | bool disable_perm; |
981776b3 | 65 | |
c10c9d96 KW |
66 | bool allow_write_beyond_eof; |
67 | ||
3301f6c6 | 68 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
f4d9cc88 JS |
69 | |
70 | int quiesce_counter; | |
26f54e9a MA |
71 | }; |
72 | ||
e7f7d676 HR |
73 | typedef struct BlockBackendAIOCB { |
74 | BlockAIOCB common; | |
4981bdec | 75 | BlockBackend *blk; |
e7f7d676 HR |
76 | int ret; |
77 | } BlockBackendAIOCB; | |
78 | ||
79 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 80 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
81 | .aiocb_size = sizeof(BlockBackendAIOCB), |
82 | }; | |
83 | ||
8fb3c76c | 84 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 85 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
b5411555 | 86 | static char *blk_get_attached_dev_id(BlockBackend *blk); |
8fb3c76c | 87 | |
2cf22d6a HR |
88 | /* All BlockBackends */ |
89 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
90 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
91 | ||
9492b0b9 HR |
92 | /* All BlockBackends referenced by the monitor and which are iterated through by |
93 | * blk_next() */ | |
94 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
95 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 96 | |
f21d96d0 KW |
97 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
98 | int parent_flags, QDict *parent_options) | |
99 | { | |
100 | /* We're not supposed to call this function for root nodes */ | |
101 | abort(); | |
102 | } | |
c2066af0 KW |
103 | static void blk_root_drained_begin(BdrvChild *child); |
104 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 | 105 | |
5c8cab48 KW |
106 | static void blk_root_change_media(BdrvChild *child, bool load); |
107 | static void blk_root_resize(BdrvChild *child); | |
108 | ||
b5411555 KW |
109 | static char *blk_root_get_parent_desc(BdrvChild *child) |
110 | { | |
111 | BlockBackend *blk = child->opaque; | |
112 | char *dev_id; | |
113 | ||
114 | if (blk->name) { | |
115 | return g_strdup(blk->name); | |
116 | } | |
117 | ||
118 | dev_id = blk_get_attached_dev_id(blk); | |
119 | if (*dev_id) { | |
120 | return dev_id; | |
121 | } else { | |
122 | /* TODO Callback into the BB owner for something more detailed */ | |
123 | g_free(dev_id); | |
124 | return g_strdup("a block device"); | |
125 | } | |
126 | } | |
127 | ||
4c265bf9 KW |
128 | static const char *blk_root_get_name(BdrvChild *child) |
129 | { | |
130 | return blk_name(child->opaque); | |
131 | } | |
132 | ||
f21d96d0 | 133 | static const BdrvChildRole child_root = { |
c2066af0 KW |
134 | .inherit_options = blk_root_inherit_options, |
135 | ||
5c8cab48 KW |
136 | .change_media = blk_root_change_media, |
137 | .resize = blk_root_resize, | |
4c265bf9 | 138 | .get_name = blk_root_get_name, |
b5411555 | 139 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 140 | |
c2066af0 KW |
141 | .drained_begin = blk_root_drained_begin, |
142 | .drained_end = blk_root_drained_end, | |
f21d96d0 KW |
143 | }; |
144 | ||
26f54e9a | 145 | /* |
efaa7c4e | 146 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
147 | * |
148 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
149 | * to request for a block driver node that is attached to this BlockBackend. | |
150 | * @shared_perm is a bitmask which describes which permissions may be granted | |
151 | * to other users of the attached node. | |
152 | * Both sets of permissions can be changed later using blk_set_perm(). | |
153 | * | |
26f54e9a MA |
154 | * Return the new BlockBackend on success, null on failure. |
155 | */ | |
6d0eb64d | 156 | BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
157 | { |
158 | BlockBackend *blk; | |
159 | ||
26f54e9a | 160 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 161 | blk->refcnt = 1; |
6d0eb64d KW |
162 | blk->perm = perm; |
163 | blk->shared_perm = shared_perm; | |
0c3169df KW |
164 | blk_set_enable_write_cache(blk, true); |
165 | ||
27ccdd52 KW |
166 | qemu_co_queue_init(&blk->public.throttled_reqs[0]); |
167 | qemu_co_queue_init(&blk->public.throttled_reqs[1]); | |
168 | ||
3301f6c6 HR |
169 | notifier_list_init(&blk->remove_bs_notifiers); |
170 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 171 | |
2cf22d6a | 172 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
173 | return blk; |
174 | } | |
175 | ||
7e7d56d9 | 176 | /* |
28eb9b12 | 177 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
178 | * |
179 | * Just as with bdrv_open(), after having called this function the reference to | |
180 | * @options belongs to the block layer (even on failure). | |
181 | * | |
182 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
183 | * BDS tree just by specifying the @options QDict (or @reference, | |
184 | * alternatively). At the time of adding this function, this is not possible, | |
185 | * though, so callers of this function have to be able to specify @filename and | |
186 | * @flags. | |
187 | */ | |
efaa7c4e HR |
188 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
189 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
190 | { |
191 | BlockBackend *blk; | |
28eb9b12 | 192 | BlockDriverState *bs; |
c62d32f5 KW |
193 | uint64_t perm; |
194 | ||
195 | /* blk_new_open() is mainly used in .bdrv_create implementations and the | |
196 | * tools where sharing isn't a concern because the BDS stays private, so we | |
197 | * just request permission according to the flags. | |
198 | * | |
199 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
200 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
201 | * shouldn't hurt either. We can still share everything here because the | |
202 | * guest devices will add their own blockers if they can't share. */ | |
203 | perm = BLK_PERM_CONSISTENT_READ; | |
204 | if (flags & BDRV_O_RDWR) { | |
205 | perm |= BLK_PERM_WRITE; | |
206 | } | |
207 | if (flags & BDRV_O_RESIZE) { | |
208 | perm |= BLK_PERM_RESIZE; | |
209 | } | |
ca49a4fd | 210 | |
c62d32f5 | 211 | blk = blk_new(perm, BLK_PERM_ALL); |
5b363937 HR |
212 | bs = bdrv_open(filename, reference, options, flags, errp); |
213 | if (!bs) { | |
ca49a4fd HR |
214 | blk_unref(blk); |
215 | return NULL; | |
216 | } | |
217 | ||
d5e6f437 | 218 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
50bfbe93 FZ |
219 | perm, BLK_PERM_ALL, blk, errp); |
220 | if (!blk->root) { | |
221 | bdrv_unref(bs); | |
222 | blk_unref(blk); | |
223 | return NULL; | |
224 | } | |
72e775c7 | 225 | |
ca49a4fd HR |
226 | return blk; |
227 | } | |
228 | ||
26f54e9a MA |
229 | static void blk_delete(BlockBackend *blk) |
230 | { | |
231 | assert(!blk->refcnt); | |
e5e78550 | 232 | assert(!blk->name); |
a7f53e26 | 233 | assert(!blk->dev); |
1606e4cf EB |
234 | if (blk->public.throttle_state) { |
235 | blk_io_limits_disable(blk); | |
236 | } | |
f21d96d0 | 237 | if (blk->root) { |
13855c6b | 238 | blk_remove_bs(blk); |
7e7d56d9 | 239 | } |
3301f6c6 HR |
240 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
241 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
2cf22d6a | 242 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 243 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 244 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
245 | g_free(blk); |
246 | } | |
247 | ||
8fb3c76c MA |
248 | static void drive_info_del(DriveInfo *dinfo) |
249 | { | |
250 | if (!dinfo) { | |
251 | return; | |
252 | } | |
253 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
254 | g_free(dinfo->serial); |
255 | g_free(dinfo); | |
256 | } | |
257 | ||
f636ae85 AG |
258 | int blk_get_refcnt(BlockBackend *blk) |
259 | { | |
260 | return blk ? blk->refcnt : 0; | |
261 | } | |
262 | ||
26f54e9a MA |
263 | /* |
264 | * Increment @blk's reference count. | |
265 | * @blk must not be null. | |
266 | */ | |
267 | void blk_ref(BlockBackend *blk) | |
268 | { | |
269 | blk->refcnt++; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Decrement @blk's reference count. | |
274 | * If this drops it to zero, destroy @blk. | |
275 | * For convenience, do nothing if @blk is null. | |
276 | */ | |
277 | void blk_unref(BlockBackend *blk) | |
278 | { | |
279 | if (blk) { | |
280 | assert(blk->refcnt > 0); | |
281 | if (!--blk->refcnt) { | |
282 | blk_delete(blk); | |
283 | } | |
284 | } | |
285 | } | |
286 | ||
2cf22d6a HR |
287 | /* |
288 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
289 | * ones which are hidden (i.e. are not referenced by the monitor). | |
290 | */ | |
291 | static BlockBackend *blk_all_next(BlockBackend *blk) | |
292 | { | |
293 | return blk ? QTAILQ_NEXT(blk, link) | |
294 | : QTAILQ_FIRST(&block_backends); | |
295 | } | |
296 | ||
d8da3cef HR |
297 | void blk_remove_all_bs(void) |
298 | { | |
74d1b8fc | 299 | BlockBackend *blk = NULL; |
d8da3cef | 300 | |
2cf22d6a | 301 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
302 | AioContext *ctx = blk_get_aio_context(blk); |
303 | ||
304 | aio_context_acquire(ctx); | |
f21d96d0 | 305 | if (blk->root) { |
d8da3cef HR |
306 | blk_remove_bs(blk); |
307 | } | |
308 | aio_context_release(ctx); | |
309 | } | |
310 | } | |
311 | ||
26f54e9a | 312 | /* |
9492b0b9 | 313 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
314 | * If @blk is null, return the first one. |
315 | * Else, return @blk's next sibling, which may be null. | |
316 | * | |
317 | * To iterate over all BlockBackends, do | |
318 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
319 | * ... | |
320 | * } | |
321 | */ | |
322 | BlockBackend *blk_next(BlockBackend *blk) | |
323 | { | |
9492b0b9 HR |
324 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
325 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
326 | } |
327 | ||
7c8eece4 KW |
328 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
329 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 330 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 331 | { |
88be7b4b | 332 | BlockDriverState *bs; |
981f4f57 | 333 | |
7c8eece4 KW |
334 | /* First, return all root nodes of BlockBackends. In order to avoid |
335 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
336 | * if the BB is the first one in the parent list of the BDS. */ | |
337 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
338 | do { | |
339 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
340 | bs = it->blk ? blk_bs(it->blk) : NULL; |
341 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 342 | |
88be7b4b KW |
343 | if (bs) { |
344 | return bs; | |
7c8eece4 KW |
345 | } |
346 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
347 | } | |
348 | ||
349 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
350 | * BDSes that are attached to a BlockBackend here; they have been handled | |
351 | * by the above block already */ | |
981f4f57 | 352 | do { |
7c8eece4 | 353 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
354 | bs = it->bs; |
355 | } while (bs && bdrv_has_blk(bs)); | |
356 | ||
357 | return bs; | |
358 | } | |
359 | ||
360 | BlockDriverState *bdrv_first(BdrvNextIterator *it) | |
361 | { | |
362 | *it = (BdrvNextIterator) { | |
363 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
364 | }; | |
981f4f57 | 365 | |
88be7b4b | 366 | return bdrv_next(it); |
981f4f57 HR |
367 | } |
368 | ||
e5e78550 HR |
369 | /* |
370 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
371 | * the given @name acting as the handle for the monitor. | |
372 | * Strictly for use by blockdev.c. | |
373 | * | |
374 | * @name must not be null or empty. | |
375 | * | |
376 | * Returns true on success and false on failure. In the latter case, an Error | |
377 | * object is returned through @errp. | |
378 | */ | |
379 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
380 | { | |
381 | assert(!blk->name); | |
382 | assert(name && name[0]); | |
383 | ||
384 | if (!id_wellformed(name)) { | |
385 | error_setg(errp, "Invalid device name"); | |
386 | return false; | |
387 | } | |
388 | if (blk_by_name(name)) { | |
389 | error_setg(errp, "Device with id '%s' already exists", name); | |
390 | return false; | |
391 | } | |
392 | if (bdrv_find_node(name)) { | |
393 | error_setg(errp, | |
394 | "Device name '%s' conflicts with an existing node name", | |
395 | name); | |
396 | return false; | |
397 | } | |
398 | ||
399 | blk->name = g_strdup(name); | |
400 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
401 | return true; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
406 | * Strictly for use by blockdev.c. | |
407 | */ | |
408 | void monitor_remove_blk(BlockBackend *blk) | |
409 | { | |
410 | if (!blk->name) { | |
411 | return; | |
412 | } | |
413 | ||
414 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
415 | g_free(blk->name); | |
416 | blk->name = NULL; | |
417 | } | |
418 | ||
26f54e9a | 419 | /* |
7e7d56d9 | 420 | * Return @blk's name, a non-null string. |
e5e78550 | 421 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a MA |
422 | */ |
423 | const char *blk_name(BlockBackend *blk) | |
424 | { | |
e5e78550 | 425 | return blk->name ?: ""; |
26f54e9a MA |
426 | } |
427 | ||
428 | /* | |
429 | * Return the BlockBackend with name @name if it exists, else null. | |
430 | * @name must not be null. | |
431 | */ | |
432 | BlockBackend *blk_by_name(const char *name) | |
433 | { | |
74d1b8fc | 434 | BlockBackend *blk = NULL; |
26f54e9a MA |
435 | |
436 | assert(name); | |
74d1b8fc | 437 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
438 | if (!strcmp(name, blk->name)) { |
439 | return blk; | |
440 | } | |
441 | } | |
442 | return NULL; | |
443 | } | |
7e7d56d9 MA |
444 | |
445 | /* | |
446 | * Return the BlockDriverState attached to @blk if any, else null. | |
447 | */ | |
448 | BlockDriverState *blk_bs(BlockBackend *blk) | |
449 | { | |
f21d96d0 | 450 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
451 | } |
452 | ||
7c8eece4 | 453 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
454 | { |
455 | BdrvChild *child; | |
456 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
457 | if (child->role == &child_root) { | |
7c8eece4 | 458 | return child->opaque; |
dde33812 KW |
459 | } |
460 | } | |
461 | ||
7c8eece4 KW |
462 | return NULL; |
463 | } | |
464 | ||
465 | /* | |
466 | * Returns true if @bs has an associated BlockBackend. | |
467 | */ | |
468 | bool bdrv_has_blk(BlockDriverState *bs) | |
469 | { | |
470 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
471 | } |
472 | ||
b6c1bae5 KW |
473 | /* |
474 | * Returns true if @bs has only BlockBackends as parents. | |
475 | */ | |
476 | bool bdrv_is_root_node(BlockDriverState *bs) | |
477 | { | |
478 | BdrvChild *c; | |
479 | ||
480 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
481 | if (c->role != &child_root) { | |
482 | return false; | |
483 | } | |
484 | } | |
485 | ||
486 | return true; | |
487 | } | |
488 | ||
18e46a03 MA |
489 | /* |
490 | * Return @blk's DriveInfo if any, else null. | |
491 | */ | |
492 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
493 | { | |
494 | return blk->legacy_dinfo; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Set @blk's DriveInfo to @dinfo, and return it. | |
499 | * @blk must not have a DriveInfo set already. | |
500 | * No other BlockBackend may have the same DriveInfo set. | |
501 | */ | |
502 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
503 | { | |
504 | assert(!blk->legacy_dinfo); | |
505 | return blk->legacy_dinfo = dinfo; | |
506 | } | |
507 | ||
508 | /* | |
509 | * Return the BlockBackend with DriveInfo @dinfo. | |
510 | * It must exist. | |
511 | */ | |
512 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
513 | { | |
74d1b8fc | 514 | BlockBackend *blk = NULL; |
18e46a03 | 515 | |
74d1b8fc | 516 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
517 | if (blk->legacy_dinfo == dinfo) { |
518 | return blk; | |
519 | } | |
520 | } | |
521 | abort(); | |
522 | } | |
523 | ||
f2cd875d KW |
524 | /* |
525 | * Returns a pointer to the publicly accessible fields of @blk. | |
526 | */ | |
527 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
528 | { | |
529 | return &blk->public; | |
530 | } | |
531 | ||
532 | /* | |
533 | * Returns a BlockBackend given the associated @public fields. | |
534 | */ | |
535 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
536 | { | |
537 | return container_of(public, BlockBackend, public); | |
538 | } | |
539 | ||
1c95f7e1 HR |
540 | /* |
541 | * Disassociates the currently associated BlockDriverState from @blk. | |
542 | */ | |
543 | void blk_remove_bs(BlockBackend *blk) | |
544 | { | |
3301f6c6 | 545 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
27ccdd52 | 546 | if (blk->public.throttle_state) { |
7ca7f0f6 | 547 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); |
a5614993 | 548 | } |
1c95f7e1 | 549 | |
7ca7f0f6 KW |
550 | blk_update_root_state(blk); |
551 | ||
f21d96d0 KW |
552 | bdrv_root_unref_child(blk->root); |
553 | blk->root = NULL; | |
1c95f7e1 HR |
554 | } |
555 | ||
0c3c36d6 HR |
556 | /* |
557 | * Associates a new BlockDriverState with @blk. | |
558 | */ | |
d7086422 | 559 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 560 | { |
d5e6f437 | 561 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
d7086422 KW |
562 | blk->perm, blk->shared_perm, blk, errp); |
563 | if (blk->root == NULL) { | |
564 | return -EPERM; | |
565 | } | |
566 | bdrv_ref(bs); | |
3301f6c6 HR |
567 | |
568 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
7ca7f0f6 KW |
569 | if (blk->public.throttle_state) { |
570 | throttle_timers_attach_aio_context( | |
571 | &blk->public.throttle_timers, bdrv_get_aio_context(bs)); | |
572 | } | |
d7086422 KW |
573 | |
574 | return 0; | |
0c3c36d6 HR |
575 | } |
576 | ||
981776b3 KW |
577 | /* |
578 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
579 | */ | |
580 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
581 | Error **errp) | |
582 | { | |
583 | int ret; | |
584 | ||
d35ff5e6 | 585 | if (blk->root && !blk->disable_perm) { |
981776b3 KW |
586 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); |
587 | if (ret < 0) { | |
588 | return ret; | |
589 | } | |
590 | } | |
591 | ||
592 | blk->perm = perm; | |
593 | blk->shared_perm = shared_perm; | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
887354bd KW |
598 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
599 | { | |
600 | *perm = blk->perm; | |
601 | *shared_perm = blk->shared_perm; | |
602 | } | |
603 | ||
d35ff5e6 KW |
604 | /* |
605 | * Notifies the user of all BlockBackends that migration has completed. qdev | |
606 | * devices can tighten their permissions in response (specifically revoke | |
607 | * shared write permissions that we needed for storage migration). | |
608 | * | |
609 | * If an error is returned, the VM cannot be allowed to be resumed. | |
610 | */ | |
611 | void blk_resume_after_migration(Error **errp) | |
612 | { | |
613 | BlockBackend *blk; | |
614 | Error *local_err = NULL; | |
615 | ||
616 | for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) { | |
617 | if (!blk->disable_perm) { | |
618 | continue; | |
619 | } | |
620 | ||
621 | blk->disable_perm = false; | |
622 | ||
623 | blk_set_perm(blk, blk->perm, blk->shared_perm, &local_err); | |
624 | if (local_err) { | |
625 | error_propagate(errp, local_err); | |
626 | blk->disable_perm = true; | |
627 | return; | |
628 | } | |
629 | } | |
630 | } | |
631 | ||
bbc8ea98 | 632 | static int blk_do_attach_dev(BlockBackend *blk, void *dev) |
4be74634 | 633 | { |
a7f53e26 MA |
634 | if (blk->dev) { |
635 | return -EBUSY; | |
636 | } | |
d35ff5e6 KW |
637 | |
638 | /* While migration is still incoming, we don't need to apply the | |
639 | * permissions of guest device BlockBackends. We might still have a block | |
640 | * job or NBD server writing to the image for storage migration. */ | |
641 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
642 | blk->disable_perm = true; | |
643 | } | |
644 | ||
84ebe375 | 645 | blk_ref(blk); |
a7f53e26 | 646 | blk->dev = dev; |
bbc8ea98 | 647 | blk->legacy_dev = false; |
373340b2 | 648 | blk_iostatus_reset(blk); |
d35ff5e6 | 649 | |
a7f53e26 | 650 | return 0; |
4be74634 MA |
651 | } |
652 | ||
bbc8ea98 KW |
653 | /* |
654 | * Attach device model @dev to @blk. | |
655 | * Return 0 on success, -EBUSY when a device model is attached already. | |
656 | */ | |
657 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
658 | { | |
659 | return blk_do_attach_dev(blk, dev); | |
660 | } | |
661 | ||
a7f53e26 MA |
662 | /* |
663 | * Attach device model @dev to @blk. | |
664 | * @blk must not have a device model attached already. | |
665 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
666 | */ | |
bbc8ea98 | 667 | void blk_attach_dev_legacy(BlockBackend *blk, void *dev) |
4be74634 | 668 | { |
bbc8ea98 | 669 | if (blk_do_attach_dev(blk, dev) < 0) { |
a7f53e26 MA |
670 | abort(); |
671 | } | |
bbc8ea98 | 672 | blk->legacy_dev = true; |
4be74634 MA |
673 | } |
674 | ||
a7f53e26 MA |
675 | /* |
676 | * Detach device model @dev from @blk. | |
677 | * @dev must be currently attached to @blk. | |
678 | */ | |
4be74634 | 679 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 680 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 681 | { |
a7f53e26 MA |
682 | assert(blk->dev == dev); |
683 | blk->dev = NULL; | |
684 | blk->dev_ops = NULL; | |
685 | blk->dev_opaque = NULL; | |
68e9ec01 | 686 | blk->guest_block_size = 512; |
981776b3 | 687 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 688 | blk_unref(blk); |
4be74634 MA |
689 | } |
690 | ||
a7f53e26 MA |
691 | /* |
692 | * Return the device model attached to @blk if any, else null. | |
693 | */ | |
4be74634 | 694 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
695 | /* TODO change to return DeviceState * when all users are qdevified */ |
696 | { | |
697 | return blk->dev; | |
698 | } | |
699 | ||
2d76e724 KW |
700 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
701 | * device attached to the BlockBackend. */ | |
702 | static char *blk_get_attached_dev_id(BlockBackend *blk) | |
703 | { | |
704 | DeviceState *dev; | |
705 | ||
706 | assert(!blk->legacy_dev); | |
707 | dev = blk->dev; | |
708 | ||
709 | if (!dev) { | |
710 | return g_strdup(""); | |
711 | } else if (dev->id) { | |
712 | return g_strdup(dev->id); | |
713 | } | |
714 | return object_get_canonical_path(OBJECT(dev)); | |
715 | } | |
716 | ||
1c89e1fa KW |
717 | /* |
718 | * Return the BlockBackend which has the device model @dev attached if it | |
719 | * exists, else null. | |
720 | * | |
721 | * @dev must not be null. | |
722 | */ | |
723 | BlockBackend *blk_by_dev(void *dev) | |
724 | { | |
725 | BlockBackend *blk = NULL; | |
726 | ||
727 | assert(dev != NULL); | |
728 | while ((blk = blk_all_next(blk)) != NULL) { | |
729 | if (blk->dev == dev) { | |
730 | return blk; | |
731 | } | |
732 | } | |
733 | return NULL; | |
734 | } | |
735 | ||
a7f53e26 MA |
736 | /* |
737 | * Set @blk's device model callbacks to @ops. | |
738 | * @opaque is the opaque argument to pass to the callbacks. | |
739 | * This is for use by device models. | |
740 | */ | |
741 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
742 | void *opaque) | |
743 | { | |
bbc8ea98 | 744 | /* All drivers that use blk_set_dev_ops() are qdevified and we want to keep |
f4d9cc88 JS |
745 | * it that way, so we can assume blk->dev, if present, is a DeviceState if |
746 | * blk->dev_ops is set. Non-device users may use dev_ops without device. */ | |
bbc8ea98 KW |
747 | assert(!blk->legacy_dev); |
748 | ||
a7f53e26 MA |
749 | blk->dev_ops = ops; |
750 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
751 | |
752 | /* Are we currently quiesced? Should we enforce this right now? */ | |
753 | if (blk->quiesce_counter && ops->drained_begin) { | |
754 | ops->drained_begin(opaque); | |
755 | } | |
a7f53e26 MA |
756 | } |
757 | ||
758 | /* | |
759 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
760 | * |
761 | * If @load is true, notify of media load. This action can fail, meaning that | |
762 | * the medium cannot be loaded. @errp is set then. | |
763 | * | |
764 | * If @load is false, notify of media eject. This can never fail. | |
765 | * | |
a7f53e26 MA |
766 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
767 | */ | |
39829a01 | 768 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 MA |
769 | { |
770 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 771 | bool tray_was_open, tray_is_open; |
39829a01 | 772 | Error *local_err = NULL; |
a7f53e26 | 773 | |
2d76e724 KW |
774 | assert(!blk->legacy_dev); |
775 | ||
f1f57066 | 776 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
777 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
778 | if (local_err) { | |
779 | assert(load == true); | |
780 | error_propagate(errp, local_err); | |
781 | return; | |
782 | } | |
f1f57066 HR |
783 | tray_is_open = blk_dev_is_tray_open(blk); |
784 | ||
785 | if (tray_was_open != tray_is_open) { | |
2d76e724 KW |
786 | char *id = blk_get_attached_dev_id(blk); |
787 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open, | |
f1f57066 | 788 | &error_abort); |
2d76e724 | 789 | g_free(id); |
a7f53e26 MA |
790 | } |
791 | } | |
792 | } | |
793 | ||
5c8cab48 KW |
794 | static void blk_root_change_media(BdrvChild *child, bool load) |
795 | { | |
39829a01 | 796 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
797 | } |
798 | ||
a7f53e26 MA |
799 | /* |
800 | * Does @blk's attached device model have removable media? | |
801 | * %true if no device model is attached. | |
802 | */ | |
803 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
804 | { | |
805 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
806 | } | |
807 | ||
8f3a73bc HR |
808 | /* |
809 | * Does @blk's attached device model have a tray? | |
810 | */ | |
811 | bool blk_dev_has_tray(BlockBackend *blk) | |
812 | { | |
813 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
814 | } | |
815 | ||
a7f53e26 MA |
816 | /* |
817 | * Notify @blk's attached device model of a media eject request. | |
818 | * If @force is true, the medium is about to be yanked out forcefully. | |
819 | */ | |
820 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 821 | { |
a7f53e26 MA |
822 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
823 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
824 | } | |
4be74634 MA |
825 | } |
826 | ||
a7f53e26 MA |
827 | /* |
828 | * Does @blk's attached device model have a tray, and is it open? | |
829 | */ | |
830 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 831 | { |
8f3a73bc | 832 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
833 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
834 | } | |
835 | return false; | |
836 | } | |
837 | ||
838 | /* | |
839 | * Does @blk's attached device model have the medium locked? | |
840 | * %false if the device model has no such lock. | |
841 | */ | |
842 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
843 | { | |
844 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
845 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
846 | } | |
847 | return false; | |
848 | } | |
849 | ||
850 | /* | |
851 | * Notify @blk's attached device model of a backend size change. | |
852 | */ | |
5c8cab48 | 853 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 854 | { |
5c8cab48 KW |
855 | BlockBackend *blk = child->opaque; |
856 | ||
a7f53e26 MA |
857 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
858 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
859 | } | |
860 | } | |
861 | ||
862 | void blk_iostatus_enable(BlockBackend *blk) | |
863 | { | |
373340b2 HR |
864 | blk->iostatus_enabled = true; |
865 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
866 | } | |
867 | ||
868 | /* The I/O status is only enabled if the drive explicitly | |
869 | * enables it _and_ the VM is configured to stop on errors */ | |
870 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
871 | { | |
872 | return (blk->iostatus_enabled && | |
873 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
874 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
875 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
876 | } | |
877 | ||
878 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
879 | { | |
880 | return blk->iostatus; | |
881 | } | |
882 | ||
883 | void blk_iostatus_disable(BlockBackend *blk) | |
884 | { | |
885 | blk->iostatus_enabled = false; | |
886 | } | |
887 | ||
888 | void blk_iostatus_reset(BlockBackend *blk) | |
889 | { | |
890 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 891 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 892 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
893 | if (bs && bs->job) { |
894 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
895 | } |
896 | } | |
897 | } | |
898 | ||
899 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
900 | { | |
901 | assert(blk_iostatus_is_enabled(blk)); | |
902 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
903 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
904 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
905 | } | |
4be74634 MA |
906 | } |
907 | ||
c10c9d96 KW |
908 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
909 | { | |
910 | blk->allow_write_beyond_eof = allow; | |
911 | } | |
912 | ||
e7f7d676 HR |
913 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
914 | size_t size) | |
915 | { | |
916 | int64_t len; | |
917 | ||
918 | if (size > INT_MAX) { | |
919 | return -EIO; | |
920 | } | |
921 | ||
c09ba36c | 922 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
923 | return -ENOMEDIUM; |
924 | } | |
925 | ||
e7f7d676 HR |
926 | if (offset < 0) { |
927 | return -EIO; | |
928 | } | |
929 | ||
c10c9d96 KW |
930 | if (!blk->allow_write_beyond_eof) { |
931 | len = blk_getlength(blk); | |
932 | if (len < 0) { | |
933 | return len; | |
934 | } | |
935 | ||
936 | if (offset > len || len - offset < size) { | |
937 | return -EIO; | |
938 | } | |
e7f7d676 HR |
939 | } |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
1e98fefd KW |
944 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
945 | unsigned int bytes, QEMUIOVector *qiov, | |
946 | BdrvRequestFlags flags) | |
4be74634 | 947 | { |
1e98fefd | 948 | int ret; |
99723548 | 949 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 950 | |
99723548 | 951 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
952 | |
953 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
954 | if (ret < 0) { |
955 | return ret; | |
956 | } | |
957 | ||
99723548 PB |
958 | bdrv_inc_in_flight(bs); |
959 | ||
441565b2 KW |
960 | /* throttling disk I/O */ |
961 | if (blk->public.throttle_state) { | |
962 | throttle_group_co_io_limits_intercept(blk, bytes, false); | |
963 | } | |
964 | ||
99723548 PB |
965 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
966 | bdrv_dec_in_flight(bs); | |
967 | return ret; | |
1bf1cbc9 KW |
968 | } |
969 | ||
1e98fefd KW |
970 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
971 | unsigned int bytes, QEMUIOVector *qiov, | |
972 | BdrvRequestFlags flags) | |
a8823a3b | 973 | { |
bfd18d1e | 974 | int ret; |
99723548 | 975 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 976 | |
99723548 | 977 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 978 | |
bfd18d1e | 979 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
980 | if (ret < 0) { |
981 | return ret; | |
982 | } | |
983 | ||
99723548 PB |
984 | bdrv_inc_in_flight(bs); |
985 | ||
441565b2 KW |
986 | /* throttling disk I/O */ |
987 | if (blk->public.throttle_state) { | |
988 | throttle_group_co_io_limits_intercept(blk, bytes, true); | |
989 | } | |
990 | ||
bfd18d1e KW |
991 | if (!blk->enable_write_cache) { |
992 | flags |= BDRV_REQ_FUA; | |
993 | } | |
994 | ||
99723548 PB |
995 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
996 | bdrv_dec_in_flight(bs); | |
997 | return ret; | |
a8823a3b KW |
998 | } |
999 | ||
1bf1cbc9 KW |
1000 | typedef struct BlkRwCo { |
1001 | BlockBackend *blk; | |
1002 | int64_t offset; | |
1003 | QEMUIOVector *qiov; | |
1004 | int ret; | |
1005 | BdrvRequestFlags flags; | |
1006 | } BlkRwCo; | |
1007 | ||
1008 | static void blk_read_entry(void *opaque) | |
1009 | { | |
1010 | BlkRwCo *rwco = opaque; | |
1011 | ||
1012 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
1013 | rwco->qiov, rwco->flags); | |
1014 | } | |
1015 | ||
a8823a3b KW |
1016 | static void blk_write_entry(void *opaque) |
1017 | { | |
1018 | BlkRwCo *rwco = opaque; | |
1019 | ||
1020 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
1021 | rwco->qiov, rwco->flags); | |
1022 | } | |
1023 | ||
a55d3fba KW |
1024 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1025 | int64_t bytes, CoroutineEntry co_entry, | |
1026 | BdrvRequestFlags flags) | |
1bf1cbc9 | 1027 | { |
1bf1cbc9 KW |
1028 | QEMUIOVector qiov; |
1029 | struct iovec iov; | |
1bf1cbc9 KW |
1030 | BlkRwCo rwco; |
1031 | ||
1bf1cbc9 KW |
1032 | iov = (struct iovec) { |
1033 | .iov_base = buf, | |
a55d3fba | 1034 | .iov_len = bytes, |
1bf1cbc9 KW |
1035 | }; |
1036 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1037 | ||
1038 | rwco = (BlkRwCo) { | |
1039 | .blk = blk, | |
a55d3fba | 1040 | .offset = offset, |
1bf1cbc9 | 1041 | .qiov = &qiov, |
fc1453cd | 1042 | .flags = flags, |
1bf1cbc9 KW |
1043 | .ret = NOT_DONE, |
1044 | }; | |
1045 | ||
35f106e6 PB |
1046 | if (qemu_in_coroutine()) { |
1047 | /* Fast-path if already in coroutine context */ | |
1048 | co_entry(&rwco); | |
1049 | } else { | |
1050 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
e92f0e19 | 1051 | bdrv_coroutine_enter(blk_bs(blk), co); |
35f106e6 PB |
1052 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); |
1053 | } | |
1bf1cbc9 KW |
1054 | |
1055 | return rwco.ret; | |
4be74634 MA |
1056 | } |
1057 | ||
b7d17f9f EB |
1058 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1059 | int count) | |
4be74634 | 1060 | { |
5bd51196 KW |
1061 | int ret; |
1062 | ||
b7d17f9f | 1063 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1064 | if (ret < 0) { |
1065 | return ret; | |
1066 | } | |
1067 | ||
c2066af0 | 1068 | blk_root_drained_begin(blk->root); |
b7d17f9f | 1069 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 1070 | blk_root_drained_end(blk->root); |
5bd51196 | 1071 | return ret; |
4be74634 MA |
1072 | } |
1073 | ||
d004bd52 EB |
1074 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1075 | int count, BdrvRequestFlags flags) | |
0df89e8e | 1076 | { |
983a1600 EB |
1077 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
1078 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
1079 | } |
1080 | ||
720ff280 KW |
1081 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1082 | { | |
1083 | return bdrv_make_zero(blk->root, flags); | |
1084 | } | |
1085 | ||
e7f7d676 HR |
1086 | static void error_callback_bh(void *opaque) |
1087 | { | |
1088 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 PB |
1089 | |
1090 | bdrv_dec_in_flight(acb->common.bs); | |
e7f7d676 HR |
1091 | acb->common.cb(acb->common.opaque, acb->ret); |
1092 | qemu_aio_unref(acb); | |
1093 | } | |
1094 | ||
ca78ecfa PL |
1095 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1096 | BlockCompletionFunc *cb, | |
1097 | void *opaque, int ret) | |
e7f7d676 HR |
1098 | { |
1099 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 1100 | |
99723548 | 1101 | bdrv_inc_in_flight(blk_bs(blk)); |
e7f7d676 | 1102 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1103 | acb->blk = blk; |
e7f7d676 HR |
1104 | acb->ret = ret; |
1105 | ||
fffb6e12 | 1106 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
1107 | return &acb->common; |
1108 | } | |
1109 | ||
57d6a428 KW |
1110 | typedef struct BlkAioEmAIOCB { |
1111 | BlockAIOCB common; | |
1112 | BlkRwCo rwco; | |
7fa84cd8 | 1113 | int bytes; |
57d6a428 | 1114 | bool has_returned; |
57d6a428 KW |
1115 | } BlkAioEmAIOCB; |
1116 | ||
1117 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1118 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1119 | }; | |
1120 | ||
1121 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1122 | { | |
57d6a428 | 1123 | if (acb->has_returned) { |
99723548 | 1124 | bdrv_dec_in_flight(acb->common.bs); |
57d6a428 KW |
1125 | acb->common.cb(acb->common.opaque, acb->rwco.ret); |
1126 | qemu_aio_unref(acb); | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | static void blk_aio_complete_bh(void *opaque) | |
1131 | { | |
fffb6e12 | 1132 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1133 | assert(acb->has_returned); |
1134 | blk_aio_complete(acb); | |
57d6a428 KW |
1135 | } |
1136 | ||
7fa84cd8 | 1137 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
1138 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
1139 | BdrvRequestFlags flags, | |
1140 | BlockCompletionFunc *cb, void *opaque) | |
1141 | { | |
1142 | BlkAioEmAIOCB *acb; | |
1143 | Coroutine *co; | |
1144 | ||
99723548 | 1145 | bdrv_inc_in_flight(blk_bs(blk)); |
57d6a428 KW |
1146 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1147 | acb->rwco = (BlkRwCo) { | |
1148 | .blk = blk, | |
1149 | .offset = offset, | |
1150 | .qiov = qiov, | |
1151 | .flags = flags, | |
1152 | .ret = NOT_DONE, | |
1153 | }; | |
7fa84cd8 | 1154 | acb->bytes = bytes; |
57d6a428 KW |
1155 | acb->has_returned = false; |
1156 | ||
0b8b8753 | 1157 | co = qemu_coroutine_create(co_entry, acb); |
e92f0e19 | 1158 | bdrv_coroutine_enter(blk_bs(blk), co); |
57d6a428 KW |
1159 | |
1160 | acb->has_returned = true; | |
1161 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1162 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1163 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1164 | } |
1165 | ||
1166 | return &acb->common; | |
1167 | } | |
1168 | ||
1169 | static void blk_aio_read_entry(void *opaque) | |
1170 | { | |
1171 | BlkAioEmAIOCB *acb = opaque; | |
1172 | BlkRwCo *rwco = &acb->rwco; | |
1173 | ||
7fa84cd8 KW |
1174 | assert(rwco->qiov->size == acb->bytes); |
1175 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1176 | rwco->qiov, rwco->flags); |
1177 | blk_aio_complete(acb); | |
1178 | } | |
1179 | ||
1180 | static void blk_aio_write_entry(void *opaque) | |
1181 | { | |
1182 | BlkAioEmAIOCB *acb = opaque; | |
1183 | BlkRwCo *rwco = &acb->rwco; | |
1184 | ||
7fa84cd8 KW |
1185 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
1186 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1187 | rwco->qiov, rwco->flags); |
1188 | blk_aio_complete(acb); | |
1189 | } | |
1190 | ||
d004bd52 EB |
1191 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1192 | int count, BdrvRequestFlags flags, | |
1193 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1194 | { |
983a1600 EB |
1195 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1196 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1197 | } |
1198 | ||
1199 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1200 | { | |
a55d3fba | 1201 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1202 | if (ret < 0) { |
1203 | return ret; | |
1204 | } | |
a55d3fba | 1205 | return count; |
4be74634 MA |
1206 | } |
1207 | ||
8341f00d EB |
1208 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1209 | BdrvRequestFlags flags) | |
4be74634 | 1210 | { |
8341f00d EB |
1211 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1212 | flags); | |
e7f7d676 HR |
1213 | if (ret < 0) { |
1214 | return ret; | |
1215 | } | |
a55d3fba | 1216 | return count; |
4be74634 MA |
1217 | } |
1218 | ||
1219 | int64_t blk_getlength(BlockBackend *blk) | |
1220 | { | |
c09ba36c HR |
1221 | if (!blk_is_available(blk)) { |
1222 | return -ENOMEDIUM; | |
1223 | } | |
1224 | ||
f21d96d0 | 1225 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1226 | } |
1227 | ||
1228 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1229 | { | |
f21d96d0 | 1230 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1231 | *nb_sectors_ptr = 0; |
1232 | } else { | |
f21d96d0 | 1233 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1234 | } |
4be74634 MA |
1235 | } |
1236 | ||
1ef01253 HR |
1237 | int64_t blk_nb_sectors(BlockBackend *blk) |
1238 | { | |
c09ba36c HR |
1239 | if (!blk_is_available(blk)) { |
1240 | return -ENOMEDIUM; | |
1241 | } | |
1242 | ||
f21d96d0 | 1243 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1244 | } |
1245 | ||
60cb2fa7 EB |
1246 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1247 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1248 | BlockCompletionFunc *cb, void *opaque) | |
1249 | { | |
1250 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1251 | blk_aio_read_entry, flags, cb, opaque); | |
1252 | } | |
1253 | ||
60cb2fa7 EB |
1254 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1255 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1256 | BlockCompletionFunc *cb, void *opaque) | |
1257 | { | |
1258 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1259 | blk_aio_write_entry, flags, cb, opaque); | |
1260 | } | |
1261 | ||
be07a889 KW |
1262 | static void blk_aio_flush_entry(void *opaque) |
1263 | { | |
1264 | BlkAioEmAIOCB *acb = opaque; | |
1265 | BlkRwCo *rwco = &acb->rwco; | |
1266 | ||
1267 | rwco->ret = blk_co_flush(rwco->blk); | |
1268 | blk_aio_complete(acb); | |
1269 | } | |
1270 | ||
4be74634 MA |
1271 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1272 | BlockCompletionFunc *cb, void *opaque) | |
1273 | { | |
be07a889 | 1274 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1275 | } |
1276 | ||
8c2e3dd5 KW |
1277 | static void blk_aio_pdiscard_entry(void *opaque) |
1278 | { | |
1279 | BlkAioEmAIOCB *acb = opaque; | |
1280 | BlkRwCo *rwco = &acb->rwco; | |
1281 | ||
1282 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1283 | blk_aio_complete(acb); | |
1284 | } | |
1285 | ||
1c6c4bb7 EB |
1286 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
1287 | int64_t offset, int count, | |
1288 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1289 | { |
8c2e3dd5 KW |
1290 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_pdiscard_entry, 0, |
1291 | cb, opaque); | |
4be74634 MA |
1292 | } |
1293 | ||
1294 | void blk_aio_cancel(BlockAIOCB *acb) | |
1295 | { | |
1296 | bdrv_aio_cancel(acb); | |
1297 | } | |
1298 | ||
1299 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1300 | { | |
1301 | bdrv_aio_cancel_async(acb); | |
1302 | } | |
1303 | ||
48af776a | 1304 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1305 | { |
c09ba36c HR |
1306 | if (!blk_is_available(blk)) { |
1307 | return -ENOMEDIUM; | |
1308 | } | |
1309 | ||
48af776a KW |
1310 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1311 | } | |
1312 | ||
1313 | static void blk_ioctl_entry(void *opaque) | |
1314 | { | |
1315 | BlkRwCo *rwco = opaque; | |
1316 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1317 | rwco->qiov->iov[0].iov_base); | |
1318 | } | |
1319 | ||
1320 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1321 | { | |
1322 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1323 | } | |
1324 | ||
1325 | static void blk_aio_ioctl_entry(void *opaque) | |
1326 | { | |
1327 | BlkAioEmAIOCB *acb = opaque; | |
1328 | BlkRwCo *rwco = &acb->rwco; | |
1329 | ||
1330 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1331 | rwco->qiov->iov[0].iov_base); | |
1332 | blk_aio_complete(acb); | |
4be74634 MA |
1333 | } |
1334 | ||
1335 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1336 | BlockCompletionFunc *cb, void *opaque) | |
1337 | { | |
48af776a KW |
1338 | QEMUIOVector qiov; |
1339 | struct iovec iov; | |
1340 | ||
1341 | iov = (struct iovec) { | |
1342 | .iov_base = buf, | |
1343 | .iov_len = 0, | |
1344 | }; | |
1345 | qemu_iovec_init_external(&qiov, &iov, 1); | |
c09ba36c | 1346 | |
48af776a | 1347 | return blk_aio_prwv(blk, req, 0, &qiov, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1348 | } |
1349 | ||
1c6c4bb7 | 1350 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count) |
2bb0dce7 | 1351 | { |
1c6c4bb7 | 1352 | int ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1353 | if (ret < 0) { |
1354 | return ret; | |
1355 | } | |
1356 | ||
1c6c4bb7 | 1357 | return bdrv_co_pdiscard(blk_bs(blk), offset, count); |
2bb0dce7 HR |
1358 | } |
1359 | ||
1360 | int blk_co_flush(BlockBackend *blk) | |
1361 | { | |
c09ba36c HR |
1362 | if (!blk_is_available(blk)) { |
1363 | return -ENOMEDIUM; | |
1364 | } | |
1365 | ||
f21d96d0 | 1366 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1367 | } |
1368 | ||
be07a889 | 1369 | static void blk_flush_entry(void *opaque) |
4be74634 | 1370 | { |
be07a889 KW |
1371 | BlkRwCo *rwco = opaque; |
1372 | rwco->ret = blk_co_flush(rwco->blk); | |
1373 | } | |
c09ba36c | 1374 | |
be07a889 KW |
1375 | int blk_flush(BlockBackend *blk) |
1376 | { | |
1377 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1378 | } |
1379 | ||
97b0385a AY |
1380 | void blk_drain(BlockBackend *blk) |
1381 | { | |
f21d96d0 KW |
1382 | if (blk_bs(blk)) { |
1383 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1384 | } |
97b0385a AY |
1385 | } |
1386 | ||
4be74634 MA |
1387 | void blk_drain_all(void) |
1388 | { | |
1389 | bdrv_drain_all(); | |
1390 | } | |
1391 | ||
373340b2 HR |
1392 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1393 | BlockdevOnError on_write_error) | |
1394 | { | |
1395 | blk->on_read_error = on_read_error; | |
1396 | blk->on_write_error = on_write_error; | |
1397 | } | |
1398 | ||
4be74634 MA |
1399 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1400 | { | |
373340b2 | 1401 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1402 | } |
1403 | ||
1404 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1405 | int error) | |
1406 | { | |
373340b2 HR |
1407 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1408 | ||
1409 | switch (on_err) { | |
1410 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1411 | return (error == ENOSPC) ? | |
1412 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1413 | case BLOCKDEV_ON_ERROR_STOP: | |
1414 | return BLOCK_ERROR_ACTION_STOP; | |
1415 | case BLOCKDEV_ON_ERROR_REPORT: | |
1416 | return BLOCK_ERROR_ACTION_REPORT; | |
1417 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1418 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1419 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1420 | default: |
1421 | abort(); | |
1422 | } | |
4be74634 MA |
1423 | } |
1424 | ||
373340b2 HR |
1425 | static void send_qmp_error_event(BlockBackend *blk, |
1426 | BlockErrorAction action, | |
1427 | bool is_read, int error) | |
1428 | { | |
1429 | IoOperationType optype; | |
1430 | ||
1431 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
2bf7e10f KW |
1432 | qapi_event_send_block_io_error(blk_name(blk), |
1433 | bdrv_get_node_name(blk_bs(blk)), optype, | |
1434 | action, blk_iostatus_is_enabled(blk), | |
373340b2 HR |
1435 | error == ENOSPC, strerror(error), |
1436 | &error_abort); | |
1437 | } | |
1438 | ||
1439 | /* This is done by device models because, while the block layer knows | |
1440 | * about the error, it does not know whether an operation comes from | |
1441 | * the device or the block layer (from a job, for example). | |
1442 | */ | |
4be74634 MA |
1443 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1444 | bool is_read, int error) | |
1445 | { | |
373340b2 HR |
1446 | assert(error >= 0); |
1447 | ||
1448 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1449 | /* First set the iostatus, so that "info block" returns an iostatus | |
1450 | * that matches the events raised so far (an additional error iostatus | |
1451 | * is fine, but not a lost one). | |
1452 | */ | |
1453 | blk_iostatus_set_err(blk, error); | |
1454 | ||
1455 | /* Then raise the request to stop the VM and the event. | |
1456 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1457 | * it ensures that the STOP event always comes after the | |
1458 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1459 | * can observe the STOP event and do a "cont" before the STOP | |
1460 | * event is issued, the VM will not stop. In this case, vm_start() | |
1461 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1462 | */ | |
1463 | qemu_system_vmstop_request_prepare(); | |
1464 | send_qmp_error_event(blk, action, is_read, error); | |
1465 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1466 | } else { | |
1467 | send_qmp_error_event(blk, action, is_read, error); | |
1468 | } | |
4be74634 MA |
1469 | } |
1470 | ||
1471 | int blk_is_read_only(BlockBackend *blk) | |
1472 | { | |
f21d96d0 KW |
1473 | BlockDriverState *bs = blk_bs(blk); |
1474 | ||
1475 | if (bs) { | |
1476 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1477 | } else { |
1478 | return blk->root_state.read_only; | |
1479 | } | |
4be74634 MA |
1480 | } |
1481 | ||
1482 | int blk_is_sg(BlockBackend *blk) | |
1483 | { | |
f21d96d0 KW |
1484 | BlockDriverState *bs = blk_bs(blk); |
1485 | ||
1486 | if (!bs) { | |
a46fc9c9 HR |
1487 | return 0; |
1488 | } | |
1489 | ||
f21d96d0 | 1490 | return bdrv_is_sg(bs); |
4be74634 MA |
1491 | } |
1492 | ||
1493 | int blk_enable_write_cache(BlockBackend *blk) | |
1494 | { | |
bfd18d1e | 1495 | return blk->enable_write_cache; |
4be74634 MA |
1496 | } |
1497 | ||
1498 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1499 | { | |
bfd18d1e | 1500 | blk->enable_write_cache = wce; |
4be74634 MA |
1501 | } |
1502 | ||
2bb0dce7 HR |
1503 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1504 | { | |
f21d96d0 KW |
1505 | BlockDriverState *bs = blk_bs(blk); |
1506 | ||
1507 | if (!bs) { | |
c09ba36c HR |
1508 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1509 | return; | |
1510 | } | |
1511 | ||
f21d96d0 | 1512 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1513 | } |
1514 | ||
e031f750 | 1515 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1516 | { |
f21d96d0 KW |
1517 | BlockDriverState *bs = blk_bs(blk); |
1518 | ||
1519 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1520 | } |
1521 | ||
1522 | bool blk_is_available(BlockBackend *blk) | |
1523 | { | |
1524 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1525 | } |
1526 | ||
1527 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1528 | { | |
f21d96d0 KW |
1529 | BlockDriverState *bs = blk_bs(blk); |
1530 | ||
1531 | if (bs) { | |
1532 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1533 | } |
4be74634 MA |
1534 | } |
1535 | ||
1536 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1537 | { | |
f21d96d0 | 1538 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1539 | char *id; |
1540 | ||
1541 | /* blk_eject is only called by qdevified devices */ | |
1542 | assert(!blk->legacy_dev); | |
f21d96d0 KW |
1543 | |
1544 | if (bs) { | |
1545 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1546 | } |
c47ee043 JS |
1547 | |
1548 | /* Whether or not we ejected on the backend, | |
1549 | * the frontend experienced a tray event. */ | |
1550 | id = blk_get_attached_dev_id(blk); | |
1551 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
1552 | eject_flag, &error_abort); | |
1553 | g_free(id); | |
4be74634 MA |
1554 | } |
1555 | ||
1556 | int blk_get_flags(BlockBackend *blk) | |
1557 | { | |
f21d96d0 KW |
1558 | BlockDriverState *bs = blk_bs(blk); |
1559 | ||
1560 | if (bs) { | |
1561 | return bdrv_get_flags(bs); | |
061959e8 HR |
1562 | } else { |
1563 | return blk->root_state.open_flags; | |
1564 | } | |
4be74634 MA |
1565 | } |
1566 | ||
5def6b80 EB |
1567 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1568 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1569 | { |
f21d96d0 | 1570 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1571 | uint32_t max = 0; |
f21d96d0 KW |
1572 | |
1573 | if (bs) { | |
5def6b80 | 1574 | max = bs->bl.max_transfer; |
a46fc9c9 | 1575 | } |
5def6b80 | 1576 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1577 | } |
1578 | ||
648296e0 SH |
1579 | int blk_get_max_iov(BlockBackend *blk) |
1580 | { | |
f21d96d0 | 1581 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1582 | } |
1583 | ||
4be74634 MA |
1584 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1585 | { | |
68e9ec01 | 1586 | blk->guest_block_size = align; |
4be74634 MA |
1587 | } |
1588 | ||
f1c17521 PB |
1589 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1590 | { | |
f21d96d0 | 1591 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1592 | } |
1593 | ||
4be74634 MA |
1594 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1595 | { | |
f21d96d0 | 1596 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1597 | } |
1598 | ||
1599 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1600 | { | |
f21d96d0 KW |
1601 | BlockDriverState *bs = blk_bs(blk); |
1602 | ||
1603 | if (!bs) { | |
a46fc9c9 HR |
1604 | return false; |
1605 | } | |
1606 | ||
f21d96d0 | 1607 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1608 | } |
1609 | ||
1610 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1611 | { | |
f21d96d0 KW |
1612 | BlockDriverState *bs = blk_bs(blk); |
1613 | ||
1614 | if (bs) { | |
1615 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1616 | } |
4be74634 MA |
1617 | } |
1618 | ||
1619 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1620 | { | |
f21d96d0 KW |
1621 | BlockDriverState *bs = blk_bs(blk); |
1622 | ||
1623 | if (bs) { | |
1624 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1625 | } |
4be74634 MA |
1626 | } |
1627 | ||
1628 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1629 | { | |
f21d96d0 KW |
1630 | BlockDriverState *bs = blk_bs(blk); |
1631 | ||
1632 | if (bs) { | |
1633 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1634 | } |
4be74634 MA |
1635 | } |
1636 | ||
1637 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1638 | { | |
f21d96d0 KW |
1639 | BlockDriverState *bs = blk_bs(blk); |
1640 | ||
1641 | if (bs) { | |
1642 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1643 | } else { |
1644 | return qemu_get_aio_context(); | |
1645 | } | |
1646 | } | |
1647 | ||
1648 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1649 | { | |
1650 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1651 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1652 | } |
1653 | ||
1654 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1655 | { | |
f21d96d0 KW |
1656 | BlockDriverState *bs = blk_bs(blk); |
1657 | ||
1658 | if (bs) { | |
7ca7f0f6 KW |
1659 | if (blk->public.throttle_state) { |
1660 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); | |
1661 | } | |
f21d96d0 | 1662 | bdrv_set_aio_context(bs, new_context); |
7ca7f0f6 KW |
1663 | if (blk->public.throttle_state) { |
1664 | throttle_timers_attach_aio_context(&blk->public.throttle_timers, | |
1665 | new_context); | |
1666 | } | |
a46fc9c9 | 1667 | } |
4be74634 MA |
1668 | } |
1669 | ||
2019ba0a HR |
1670 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1671 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1672 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1673 | { | |
f21d96d0 KW |
1674 | BlockDriverState *bs = blk_bs(blk); |
1675 | ||
1676 | if (bs) { | |
1677 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1678 | detach_aio_context, opaque); |
1679 | } | |
2019ba0a HR |
1680 | } |
1681 | ||
1682 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1683 | void (*attached_aio_context)(AioContext *, | |
1684 | void *), | |
1685 | void (*detach_aio_context)(void *), | |
1686 | void *opaque) | |
1687 | { | |
f21d96d0 KW |
1688 | BlockDriverState *bs = blk_bs(blk); |
1689 | ||
1690 | if (bs) { | |
1691 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1692 | detach_aio_context, opaque); |
1693 | } | |
2019ba0a HR |
1694 | } |
1695 | ||
3301f6c6 HR |
1696 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1697 | { | |
1698 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1699 | } | |
1700 | ||
1701 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1702 | { | |
1703 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1704 | } | |
1705 | ||
4be74634 MA |
1706 | void blk_io_plug(BlockBackend *blk) |
1707 | { | |
f21d96d0 KW |
1708 | BlockDriverState *bs = blk_bs(blk); |
1709 | ||
1710 | if (bs) { | |
1711 | bdrv_io_plug(bs); | |
a46fc9c9 | 1712 | } |
4be74634 MA |
1713 | } |
1714 | ||
1715 | void blk_io_unplug(BlockBackend *blk) | |
1716 | { | |
f21d96d0 KW |
1717 | BlockDriverState *bs = blk_bs(blk); |
1718 | ||
1719 | if (bs) { | |
1720 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1721 | } |
4be74634 MA |
1722 | } |
1723 | ||
1724 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1725 | { | |
7f0e9da6 | 1726 | return &blk->stats; |
4be74634 MA |
1727 | } |
1728 | ||
1729 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1730 | BlockCompletionFunc *cb, void *opaque) | |
1731 | { | |
1732 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1733 | } | |
1ef01253 | 1734 | |
d004bd52 EB |
1735 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1736 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1737 | { |
983a1600 | 1738 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1739 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1740 | } |
1741 | ||
fe5c1355 PB |
1742 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1743 | int count) | |
1ef01253 | 1744 | { |
35fadca8 PB |
1745 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1746 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
1747 | } |
1748 | ||
5797a36a | 1749 | int blk_truncate(BlockBackend *blk, int64_t offset, Error **errp) |
1ef01253 | 1750 | { |
c09ba36c | 1751 | if (!blk_is_available(blk)) { |
5797a36a | 1752 | error_setg(errp, "No medium inserted"); |
c09ba36c HR |
1753 | return -ENOMEDIUM; |
1754 | } | |
1755 | ||
5797a36a | 1756 | return bdrv_truncate(blk->root, offset, errp); |
1ef01253 HR |
1757 | } |
1758 | ||
8c2e3dd5 | 1759 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 1760 | { |
8c2e3dd5 KW |
1761 | BlkRwCo *rwco = opaque; |
1762 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, rwco->qiov->size); | |
1763 | } | |
e7f7d676 | 1764 | |
8c2e3dd5 KW |
1765 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int count) |
1766 | { | |
1767 | return blk_prw(blk, offset, NULL, count, blk_pdiscard_entry, 0); | |
1ef01253 HR |
1768 | } |
1769 | ||
1770 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1771 | int64_t pos, int size) | |
1772 | { | |
bfd18d1e KW |
1773 | int ret; |
1774 | ||
c09ba36c HR |
1775 | if (!blk_is_available(blk)) { |
1776 | return -ENOMEDIUM; | |
1777 | } | |
1778 | ||
bfd18d1e KW |
1779 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1780 | if (ret < 0) { | |
1781 | return ret; | |
1782 | } | |
1783 | ||
1784 | if (ret == size && !blk->enable_write_cache) { | |
1785 | ret = bdrv_flush(blk_bs(blk)); | |
1786 | } | |
1787 | ||
1788 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1789 | } |
1790 | ||
1791 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1792 | { | |
c09ba36c HR |
1793 | if (!blk_is_available(blk)) { |
1794 | return -ENOMEDIUM; | |
1795 | } | |
1796 | ||
f21d96d0 | 1797 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1798 | } |
f0272c4d ET |
1799 | |
1800 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1801 | { | |
c09ba36c HR |
1802 | if (!blk_is_available(blk)) { |
1803 | return -ENOMEDIUM; | |
1804 | } | |
1805 | ||
f21d96d0 | 1806 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1807 | } |
1808 | ||
1809 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1810 | { | |
c09ba36c HR |
1811 | if (!blk_is_available(blk)) { |
1812 | return -ENOMEDIUM; | |
1813 | } | |
1814 | ||
f21d96d0 | 1815 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1816 | } |
281d22d8 HR |
1817 | |
1818 | /* | |
1819 | * Updates the BlockBackendRootState object with data from the currently | |
1820 | * attached BlockDriverState. | |
1821 | */ | |
1822 | void blk_update_root_state(BlockBackend *blk) | |
1823 | { | |
f21d96d0 | 1824 | assert(blk->root); |
281d22d8 | 1825 | |
f21d96d0 KW |
1826 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1827 | blk->root_state.read_only = blk->root->bs->read_only; | |
1828 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1829 | } |
1830 | ||
38cb18f5 | 1831 | /* |
b85114f8 KW |
1832 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
1833 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 1834 | */ |
b85114f8 | 1835 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 1836 | { |
b85114f8 | 1837 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
1838 | } |
1839 | ||
1840 | /* | |
1841 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1842 | * supposed to inherit the root state. | |
1843 | */ | |
1844 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1845 | { | |
1846 | int bs_flags; | |
1847 | ||
1848 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1849 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1850 | ||
1851 | return bs_flags; | |
1852 | } | |
1853 | ||
281d22d8 HR |
1854 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1855 | { | |
1856 | return &blk->root_state; | |
1857 | } | |
1393f212 HR |
1858 | |
1859 | int blk_commit_all(void) | |
1860 | { | |
fe1a9cbc HR |
1861 | BlockBackend *blk = NULL; |
1862 | ||
1863 | while ((blk = blk_all_next(blk)) != NULL) { | |
1864 | AioContext *aio_context = blk_get_aio_context(blk); | |
1865 | ||
1866 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1867 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1868 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1869 | if (ret < 0) { |
1870 | aio_context_release(aio_context); | |
1871 | return ret; | |
1872 | } | |
1873 | } | |
1874 | aio_context_release(aio_context); | |
1875 | } | |
1876 | return 0; | |
1877 | } | |
1878 | ||
97148076 KW |
1879 | |
1880 | /* throttling disk I/O limits */ | |
1881 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
1882 | { | |
1883 | throttle_group_config(blk, cfg); | |
1884 | } | |
1885 | ||
1886 | void blk_io_limits_disable(BlockBackend *blk) | |
1887 | { | |
1888 | assert(blk->public.throttle_state); | |
c2066af0 | 1889 | bdrv_drained_begin(blk_bs(blk)); |
97148076 | 1890 | throttle_group_unregister_blk(blk); |
c2066af0 | 1891 | bdrv_drained_end(blk_bs(blk)); |
97148076 KW |
1892 | } |
1893 | ||
1894 | /* should be called before blk_set_io_limits if a limit is set */ | |
1895 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
1896 | { | |
1897 | assert(!blk->public.throttle_state); | |
1898 | throttle_group_register_blk(blk, group); | |
1899 | } | |
1900 | ||
1901 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
1902 | { | |
1903 | /* this BB is not part of any group */ | |
1904 | if (!blk->public.throttle_state) { | |
1905 | return; | |
1906 | } | |
1907 | ||
1908 | /* this BB is a part of the same group than the one we want */ | |
1909 | if (!g_strcmp0(throttle_group_get_name(blk), group)) { | |
1910 | return; | |
1911 | } | |
1912 | ||
1913 | /* need to change the group this bs belong to */ | |
1914 | blk_io_limits_disable(blk); | |
1915 | blk_io_limits_enable(blk, group); | |
1916 | } | |
c2066af0 KW |
1917 | |
1918 | static void blk_root_drained_begin(BdrvChild *child) | |
1919 | { | |
1920 | BlockBackend *blk = child->opaque; | |
1921 | ||
f4d9cc88 JS |
1922 | if (++blk->quiesce_counter == 1) { |
1923 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
1924 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
1925 | } | |
1926 | } | |
1927 | ||
36fe1331 KW |
1928 | /* Note that blk->root may not be accessible here yet if we are just |
1929 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
1930 | ||
c2066af0 KW |
1931 | if (blk->public.io_limits_disabled++ == 0) { |
1932 | throttle_group_restart_blk(blk); | |
1933 | } | |
1934 | } | |
1935 | ||
1936 | static void blk_root_drained_end(BdrvChild *child) | |
1937 | { | |
1938 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 1939 | assert(blk->quiesce_counter); |
c2066af0 KW |
1940 | |
1941 | assert(blk->public.io_limits_disabled); | |
1942 | --blk->public.io_limits_disabled; | |
f4d9cc88 JS |
1943 | |
1944 | if (--blk->quiesce_counter == 0) { | |
1945 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
1946 | blk->dev_ops->drained_end(blk->dev_opaque); | |
1947 | } | |
1948 | } | |
c2066af0 | 1949 | } |