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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; | |
64 | ||
c10c9d96 KW |
65 | bool allow_write_beyond_eof; |
66 | ||
3301f6c6 | 67 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
f4d9cc88 JS |
68 | |
69 | int quiesce_counter; | |
26f54e9a MA |
70 | }; |
71 | ||
e7f7d676 HR |
72 | typedef struct BlockBackendAIOCB { |
73 | BlockAIOCB common; | |
4981bdec | 74 | BlockBackend *blk; |
e7f7d676 HR |
75 | int ret; |
76 | } BlockBackendAIOCB; | |
77 | ||
78 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 79 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
80 | .aiocb_size = sizeof(BlockBackendAIOCB), |
81 | }; | |
82 | ||
8fb3c76c | 83 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 84 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
b5411555 | 85 | static char *blk_get_attached_dev_id(BlockBackend *blk); |
8fb3c76c | 86 | |
2cf22d6a HR |
87 | /* All BlockBackends */ |
88 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
89 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
90 | ||
9492b0b9 HR |
91 | /* All BlockBackends referenced by the monitor and which are iterated through by |
92 | * blk_next() */ | |
93 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
94 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 95 | |
f21d96d0 KW |
96 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
97 | int parent_flags, QDict *parent_options) | |
98 | { | |
99 | /* We're not supposed to call this function for root nodes */ | |
100 | abort(); | |
101 | } | |
c2066af0 KW |
102 | static void blk_root_drained_begin(BdrvChild *child); |
103 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 | 104 | |
5c8cab48 KW |
105 | static void blk_root_change_media(BdrvChild *child, bool load); |
106 | static void blk_root_resize(BdrvChild *child); | |
107 | ||
b5411555 KW |
108 | static char *blk_root_get_parent_desc(BdrvChild *child) |
109 | { | |
110 | BlockBackend *blk = child->opaque; | |
111 | char *dev_id; | |
112 | ||
113 | if (blk->name) { | |
114 | return g_strdup(blk->name); | |
115 | } | |
116 | ||
117 | dev_id = blk_get_attached_dev_id(blk); | |
118 | if (*dev_id) { | |
119 | return dev_id; | |
120 | } else { | |
121 | /* TODO Callback into the BB owner for something more detailed */ | |
122 | g_free(dev_id); | |
123 | return g_strdup("a block device"); | |
124 | } | |
125 | } | |
126 | ||
4c265bf9 KW |
127 | static const char *blk_root_get_name(BdrvChild *child) |
128 | { | |
129 | return blk_name(child->opaque); | |
130 | } | |
131 | ||
f21d96d0 | 132 | static const BdrvChildRole child_root = { |
c2066af0 KW |
133 | .inherit_options = blk_root_inherit_options, |
134 | ||
5c8cab48 KW |
135 | .change_media = blk_root_change_media, |
136 | .resize = blk_root_resize, | |
4c265bf9 | 137 | .get_name = blk_root_get_name, |
b5411555 | 138 | .get_parent_desc = blk_root_get_parent_desc, |
5c8cab48 | 139 | |
c2066af0 KW |
140 | .drained_begin = blk_root_drained_begin, |
141 | .drained_end = blk_root_drained_end, | |
f21d96d0 KW |
142 | }; |
143 | ||
26f54e9a | 144 | /* |
efaa7c4e | 145 | * Create a new BlockBackend with a reference count of one. |
6d0eb64d KW |
146 | * |
147 | * @perm is a bitmasks of BLK_PERM_* constants which describes the permissions | |
148 | * to request for a block driver node that is attached to this BlockBackend. | |
149 | * @shared_perm is a bitmask which describes which permissions may be granted | |
150 | * to other users of the attached node. | |
151 | * Both sets of permissions can be changed later using blk_set_perm(). | |
152 | * | |
26f54e9a MA |
153 | * Return the new BlockBackend on success, null on failure. |
154 | */ | |
6d0eb64d | 155 | BlockBackend *blk_new(uint64_t perm, uint64_t shared_perm) |
26f54e9a MA |
156 | { |
157 | BlockBackend *blk; | |
158 | ||
26f54e9a | 159 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 160 | blk->refcnt = 1; |
6d0eb64d KW |
161 | blk->perm = perm; |
162 | blk->shared_perm = shared_perm; | |
0c3169df KW |
163 | blk_set_enable_write_cache(blk, true); |
164 | ||
27ccdd52 KW |
165 | qemu_co_queue_init(&blk->public.throttled_reqs[0]); |
166 | qemu_co_queue_init(&blk->public.throttled_reqs[1]); | |
167 | ||
3301f6c6 HR |
168 | notifier_list_init(&blk->remove_bs_notifiers); |
169 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 170 | |
2cf22d6a | 171 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
172 | return blk; |
173 | } | |
174 | ||
7e7d56d9 | 175 | /* |
28eb9b12 | 176 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
177 | * |
178 | * Just as with bdrv_open(), after having called this function the reference to | |
179 | * @options belongs to the block layer (even on failure). | |
180 | * | |
181 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
182 | * BDS tree just by specifying the @options QDict (or @reference, | |
183 | * alternatively). At the time of adding this function, this is not possible, | |
184 | * though, so callers of this function have to be able to specify @filename and | |
185 | * @flags. | |
186 | */ | |
efaa7c4e HR |
187 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
188 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
189 | { |
190 | BlockBackend *blk; | |
28eb9b12 | 191 | BlockDriverState *bs; |
c62d32f5 KW |
192 | uint64_t perm; |
193 | ||
194 | /* blk_new_open() is mainly used in .bdrv_create implementations and the | |
195 | * tools where sharing isn't a concern because the BDS stays private, so we | |
196 | * just request permission according to the flags. | |
197 | * | |
198 | * The exceptions are xen_disk and blockdev_init(); in these cases, the | |
199 | * caller of blk_new_open() doesn't make use of the permissions, but they | |
200 | * shouldn't hurt either. We can still share everything here because the | |
201 | * guest devices will add their own blockers if they can't share. */ | |
202 | perm = BLK_PERM_CONSISTENT_READ; | |
203 | if (flags & BDRV_O_RDWR) { | |
204 | perm |= BLK_PERM_WRITE; | |
205 | } | |
206 | if (flags & BDRV_O_RESIZE) { | |
207 | perm |= BLK_PERM_RESIZE; | |
208 | } | |
ca49a4fd | 209 | |
c62d32f5 | 210 | blk = blk_new(perm, BLK_PERM_ALL); |
5b363937 HR |
211 | bs = bdrv_open(filename, reference, options, flags, errp); |
212 | if (!bs) { | |
ca49a4fd HR |
213 | blk_unref(blk); |
214 | return NULL; | |
215 | } | |
216 | ||
d5e6f437 | 217 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
50bfbe93 FZ |
218 | perm, BLK_PERM_ALL, blk, errp); |
219 | if (!blk->root) { | |
220 | bdrv_unref(bs); | |
221 | blk_unref(blk); | |
222 | return NULL; | |
223 | } | |
72e775c7 | 224 | |
ca49a4fd HR |
225 | return blk; |
226 | } | |
227 | ||
26f54e9a MA |
228 | static void blk_delete(BlockBackend *blk) |
229 | { | |
230 | assert(!blk->refcnt); | |
e5e78550 | 231 | assert(!blk->name); |
a7f53e26 | 232 | assert(!blk->dev); |
f21d96d0 | 233 | if (blk->root) { |
13855c6b | 234 | blk_remove_bs(blk); |
7e7d56d9 | 235 | } |
3301f6c6 HR |
236 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
237 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
2cf22d6a | 238 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 239 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 240 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
241 | g_free(blk); |
242 | } | |
243 | ||
8fb3c76c MA |
244 | static void drive_info_del(DriveInfo *dinfo) |
245 | { | |
246 | if (!dinfo) { | |
247 | return; | |
248 | } | |
249 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
250 | g_free(dinfo->serial); |
251 | g_free(dinfo); | |
252 | } | |
253 | ||
f636ae85 AG |
254 | int blk_get_refcnt(BlockBackend *blk) |
255 | { | |
256 | return blk ? blk->refcnt : 0; | |
257 | } | |
258 | ||
26f54e9a MA |
259 | /* |
260 | * Increment @blk's reference count. | |
261 | * @blk must not be null. | |
262 | */ | |
263 | void blk_ref(BlockBackend *blk) | |
264 | { | |
265 | blk->refcnt++; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Decrement @blk's reference count. | |
270 | * If this drops it to zero, destroy @blk. | |
271 | * For convenience, do nothing if @blk is null. | |
272 | */ | |
273 | void blk_unref(BlockBackend *blk) | |
274 | { | |
275 | if (blk) { | |
276 | assert(blk->refcnt > 0); | |
277 | if (!--blk->refcnt) { | |
278 | blk_delete(blk); | |
279 | } | |
280 | } | |
281 | } | |
282 | ||
2cf22d6a HR |
283 | /* |
284 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
285 | * ones which are hidden (i.e. are not referenced by the monitor). | |
286 | */ | |
287 | static BlockBackend *blk_all_next(BlockBackend *blk) | |
288 | { | |
289 | return blk ? QTAILQ_NEXT(blk, link) | |
290 | : QTAILQ_FIRST(&block_backends); | |
291 | } | |
292 | ||
d8da3cef HR |
293 | void blk_remove_all_bs(void) |
294 | { | |
74d1b8fc | 295 | BlockBackend *blk = NULL; |
d8da3cef | 296 | |
2cf22d6a | 297 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
298 | AioContext *ctx = blk_get_aio_context(blk); |
299 | ||
300 | aio_context_acquire(ctx); | |
f21d96d0 | 301 | if (blk->root) { |
d8da3cef HR |
302 | blk_remove_bs(blk); |
303 | } | |
304 | aio_context_release(ctx); | |
305 | } | |
306 | } | |
307 | ||
26f54e9a | 308 | /* |
9492b0b9 | 309 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
310 | * If @blk is null, return the first one. |
311 | * Else, return @blk's next sibling, which may be null. | |
312 | * | |
313 | * To iterate over all BlockBackends, do | |
314 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
315 | * ... | |
316 | * } | |
317 | */ | |
318 | BlockBackend *blk_next(BlockBackend *blk) | |
319 | { | |
9492b0b9 HR |
320 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
321 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
322 | } |
323 | ||
7c8eece4 KW |
324 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
325 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 326 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 327 | { |
88be7b4b | 328 | BlockDriverState *bs; |
981f4f57 | 329 | |
7c8eece4 KW |
330 | /* First, return all root nodes of BlockBackends. In order to avoid |
331 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
332 | * if the BB is the first one in the parent list of the BDS. */ | |
333 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
334 | do { | |
335 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
336 | bs = it->blk ? blk_bs(it->blk) : NULL; |
337 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 338 | |
88be7b4b KW |
339 | if (bs) { |
340 | return bs; | |
7c8eece4 KW |
341 | } |
342 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
343 | } | |
344 | ||
345 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
346 | * BDSes that are attached to a BlockBackend here; they have been handled | |
347 | * by the above block already */ | |
981f4f57 | 348 | do { |
7c8eece4 | 349 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
350 | bs = it->bs; |
351 | } while (bs && bdrv_has_blk(bs)); | |
352 | ||
353 | return bs; | |
354 | } | |
355 | ||
356 | BlockDriverState *bdrv_first(BdrvNextIterator *it) | |
357 | { | |
358 | *it = (BdrvNextIterator) { | |
359 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
360 | }; | |
981f4f57 | 361 | |
88be7b4b | 362 | return bdrv_next(it); |
981f4f57 HR |
363 | } |
364 | ||
e5e78550 HR |
365 | /* |
366 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
367 | * the given @name acting as the handle for the monitor. | |
368 | * Strictly for use by blockdev.c. | |
369 | * | |
370 | * @name must not be null or empty. | |
371 | * | |
372 | * Returns true on success and false on failure. In the latter case, an Error | |
373 | * object is returned through @errp. | |
374 | */ | |
375 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
376 | { | |
377 | assert(!blk->name); | |
378 | assert(name && name[0]); | |
379 | ||
380 | if (!id_wellformed(name)) { | |
381 | error_setg(errp, "Invalid device name"); | |
382 | return false; | |
383 | } | |
384 | if (blk_by_name(name)) { | |
385 | error_setg(errp, "Device with id '%s' already exists", name); | |
386 | return false; | |
387 | } | |
388 | if (bdrv_find_node(name)) { | |
389 | error_setg(errp, | |
390 | "Device name '%s' conflicts with an existing node name", | |
391 | name); | |
392 | return false; | |
393 | } | |
394 | ||
395 | blk->name = g_strdup(name); | |
396 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
397 | return true; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
402 | * Strictly for use by blockdev.c. | |
403 | */ | |
404 | void monitor_remove_blk(BlockBackend *blk) | |
405 | { | |
406 | if (!blk->name) { | |
407 | return; | |
408 | } | |
409 | ||
410 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
411 | g_free(blk->name); | |
412 | blk->name = NULL; | |
413 | } | |
414 | ||
26f54e9a | 415 | /* |
7e7d56d9 | 416 | * Return @blk's name, a non-null string. |
e5e78550 | 417 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a MA |
418 | */ |
419 | const char *blk_name(BlockBackend *blk) | |
420 | { | |
e5e78550 | 421 | return blk->name ?: ""; |
26f54e9a MA |
422 | } |
423 | ||
424 | /* | |
425 | * Return the BlockBackend with name @name if it exists, else null. | |
426 | * @name must not be null. | |
427 | */ | |
428 | BlockBackend *blk_by_name(const char *name) | |
429 | { | |
74d1b8fc | 430 | BlockBackend *blk = NULL; |
26f54e9a MA |
431 | |
432 | assert(name); | |
74d1b8fc | 433 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
434 | if (!strcmp(name, blk->name)) { |
435 | return blk; | |
436 | } | |
437 | } | |
438 | return NULL; | |
439 | } | |
7e7d56d9 MA |
440 | |
441 | /* | |
442 | * Return the BlockDriverState attached to @blk if any, else null. | |
443 | */ | |
444 | BlockDriverState *blk_bs(BlockBackend *blk) | |
445 | { | |
f21d96d0 | 446 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
447 | } |
448 | ||
7c8eece4 | 449 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
450 | { |
451 | BdrvChild *child; | |
452 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
453 | if (child->role == &child_root) { | |
7c8eece4 | 454 | return child->opaque; |
dde33812 KW |
455 | } |
456 | } | |
457 | ||
7c8eece4 KW |
458 | return NULL; |
459 | } | |
460 | ||
461 | /* | |
462 | * Returns true if @bs has an associated BlockBackend. | |
463 | */ | |
464 | bool bdrv_has_blk(BlockDriverState *bs) | |
465 | { | |
466 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
467 | } |
468 | ||
b6c1bae5 KW |
469 | /* |
470 | * Returns true if @bs has only BlockBackends as parents. | |
471 | */ | |
472 | bool bdrv_is_root_node(BlockDriverState *bs) | |
473 | { | |
474 | BdrvChild *c; | |
475 | ||
476 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
477 | if (c->role != &child_root) { | |
478 | return false; | |
479 | } | |
480 | } | |
481 | ||
482 | return true; | |
483 | } | |
484 | ||
18e46a03 MA |
485 | /* |
486 | * Return @blk's DriveInfo if any, else null. | |
487 | */ | |
488 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
489 | { | |
490 | return blk->legacy_dinfo; | |
491 | } | |
492 | ||
493 | /* | |
494 | * Set @blk's DriveInfo to @dinfo, and return it. | |
495 | * @blk must not have a DriveInfo set already. | |
496 | * No other BlockBackend may have the same DriveInfo set. | |
497 | */ | |
498 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
499 | { | |
500 | assert(!blk->legacy_dinfo); | |
501 | return blk->legacy_dinfo = dinfo; | |
502 | } | |
503 | ||
504 | /* | |
505 | * Return the BlockBackend with DriveInfo @dinfo. | |
506 | * It must exist. | |
507 | */ | |
508 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
509 | { | |
74d1b8fc | 510 | BlockBackend *blk = NULL; |
18e46a03 | 511 | |
74d1b8fc | 512 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
513 | if (blk->legacy_dinfo == dinfo) { |
514 | return blk; | |
515 | } | |
516 | } | |
517 | abort(); | |
518 | } | |
519 | ||
f2cd875d KW |
520 | /* |
521 | * Returns a pointer to the publicly accessible fields of @blk. | |
522 | */ | |
523 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
524 | { | |
525 | return &blk->public; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Returns a BlockBackend given the associated @public fields. | |
530 | */ | |
531 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
532 | { | |
533 | return container_of(public, BlockBackend, public); | |
534 | } | |
535 | ||
1c95f7e1 HR |
536 | /* |
537 | * Disassociates the currently associated BlockDriverState from @blk. | |
538 | */ | |
539 | void blk_remove_bs(BlockBackend *blk) | |
540 | { | |
3301f6c6 | 541 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
27ccdd52 | 542 | if (blk->public.throttle_state) { |
7ca7f0f6 | 543 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); |
a5614993 | 544 | } |
1c95f7e1 | 545 | |
7ca7f0f6 KW |
546 | blk_update_root_state(blk); |
547 | ||
f21d96d0 KW |
548 | bdrv_root_unref_child(blk->root); |
549 | blk->root = NULL; | |
1c95f7e1 HR |
550 | } |
551 | ||
0c3c36d6 HR |
552 | /* |
553 | * Associates a new BlockDriverState with @blk. | |
554 | */ | |
d7086422 | 555 | int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) |
0c3c36d6 | 556 | { |
d5e6f437 | 557 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, |
d7086422 KW |
558 | blk->perm, blk->shared_perm, blk, errp); |
559 | if (blk->root == NULL) { | |
560 | return -EPERM; | |
561 | } | |
562 | bdrv_ref(bs); | |
3301f6c6 HR |
563 | |
564 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
7ca7f0f6 KW |
565 | if (blk->public.throttle_state) { |
566 | throttle_timers_attach_aio_context( | |
567 | &blk->public.throttle_timers, bdrv_get_aio_context(bs)); | |
568 | } | |
d7086422 KW |
569 | |
570 | return 0; | |
0c3c36d6 HR |
571 | } |
572 | ||
981776b3 KW |
573 | /* |
574 | * Sets the permission bitmasks that the user of the BlockBackend needs. | |
575 | */ | |
576 | int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, | |
577 | Error **errp) | |
578 | { | |
579 | int ret; | |
580 | ||
581 | if (blk->root) { | |
582 | ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp); | |
583 | if (ret < 0) { | |
584 | return ret; | |
585 | } | |
586 | } | |
587 | ||
588 | blk->perm = perm; | |
589 | blk->shared_perm = shared_perm; | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
887354bd KW |
594 | void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm) |
595 | { | |
596 | *perm = blk->perm; | |
597 | *shared_perm = blk->shared_perm; | |
598 | } | |
599 | ||
bbc8ea98 | 600 | static int blk_do_attach_dev(BlockBackend *blk, void *dev) |
4be74634 | 601 | { |
a7f53e26 MA |
602 | if (blk->dev) { |
603 | return -EBUSY; | |
604 | } | |
84ebe375 | 605 | blk_ref(blk); |
a7f53e26 | 606 | blk->dev = dev; |
bbc8ea98 | 607 | blk->legacy_dev = false; |
373340b2 | 608 | blk_iostatus_reset(blk); |
a7f53e26 | 609 | return 0; |
4be74634 MA |
610 | } |
611 | ||
bbc8ea98 KW |
612 | /* |
613 | * Attach device model @dev to @blk. | |
614 | * Return 0 on success, -EBUSY when a device model is attached already. | |
615 | */ | |
616 | int blk_attach_dev(BlockBackend *blk, DeviceState *dev) | |
617 | { | |
618 | return blk_do_attach_dev(blk, dev); | |
619 | } | |
620 | ||
a7f53e26 MA |
621 | /* |
622 | * Attach device model @dev to @blk. | |
623 | * @blk must not have a device model attached already. | |
624 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
625 | */ | |
bbc8ea98 | 626 | void blk_attach_dev_legacy(BlockBackend *blk, void *dev) |
4be74634 | 627 | { |
bbc8ea98 | 628 | if (blk_do_attach_dev(blk, dev) < 0) { |
a7f53e26 MA |
629 | abort(); |
630 | } | |
bbc8ea98 | 631 | blk->legacy_dev = true; |
4be74634 MA |
632 | } |
633 | ||
a7f53e26 MA |
634 | /* |
635 | * Detach device model @dev from @blk. | |
636 | * @dev must be currently attached to @blk. | |
637 | */ | |
4be74634 | 638 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 639 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 640 | { |
a7f53e26 MA |
641 | assert(blk->dev == dev); |
642 | blk->dev = NULL; | |
643 | blk->dev_ops = NULL; | |
644 | blk->dev_opaque = NULL; | |
68e9ec01 | 645 | blk->guest_block_size = 512; |
981776b3 | 646 | blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); |
84ebe375 | 647 | blk_unref(blk); |
4be74634 MA |
648 | } |
649 | ||
a7f53e26 MA |
650 | /* |
651 | * Return the device model attached to @blk if any, else null. | |
652 | */ | |
4be74634 | 653 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
654 | /* TODO change to return DeviceState * when all users are qdevified */ |
655 | { | |
656 | return blk->dev; | |
657 | } | |
658 | ||
2d76e724 KW |
659 | /* Return the qdev ID, or if no ID is assigned the QOM path, of the block |
660 | * device attached to the BlockBackend. */ | |
661 | static char *blk_get_attached_dev_id(BlockBackend *blk) | |
662 | { | |
663 | DeviceState *dev; | |
664 | ||
665 | assert(!blk->legacy_dev); | |
666 | dev = blk->dev; | |
667 | ||
668 | if (!dev) { | |
669 | return g_strdup(""); | |
670 | } else if (dev->id) { | |
671 | return g_strdup(dev->id); | |
672 | } | |
673 | return object_get_canonical_path(OBJECT(dev)); | |
674 | } | |
675 | ||
1c89e1fa KW |
676 | /* |
677 | * Return the BlockBackend which has the device model @dev attached if it | |
678 | * exists, else null. | |
679 | * | |
680 | * @dev must not be null. | |
681 | */ | |
682 | BlockBackend *blk_by_dev(void *dev) | |
683 | { | |
684 | BlockBackend *blk = NULL; | |
685 | ||
686 | assert(dev != NULL); | |
687 | while ((blk = blk_all_next(blk)) != NULL) { | |
688 | if (blk->dev == dev) { | |
689 | return blk; | |
690 | } | |
691 | } | |
692 | return NULL; | |
693 | } | |
694 | ||
a7f53e26 MA |
695 | /* |
696 | * Set @blk's device model callbacks to @ops. | |
697 | * @opaque is the opaque argument to pass to the callbacks. | |
698 | * This is for use by device models. | |
699 | */ | |
700 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
701 | void *opaque) | |
702 | { | |
bbc8ea98 | 703 | /* All drivers that use blk_set_dev_ops() are qdevified and we want to keep |
f4d9cc88 JS |
704 | * it that way, so we can assume blk->dev, if present, is a DeviceState if |
705 | * blk->dev_ops is set. Non-device users may use dev_ops without device. */ | |
bbc8ea98 KW |
706 | assert(!blk->legacy_dev); |
707 | ||
a7f53e26 MA |
708 | blk->dev_ops = ops; |
709 | blk->dev_opaque = opaque; | |
f4d9cc88 JS |
710 | |
711 | /* Are we currently quiesced? Should we enforce this right now? */ | |
712 | if (blk->quiesce_counter && ops->drained_begin) { | |
713 | ops->drained_begin(opaque); | |
714 | } | |
a7f53e26 MA |
715 | } |
716 | ||
717 | /* | |
718 | * Notify @blk's attached device model of media change. | |
39829a01 KW |
719 | * |
720 | * If @load is true, notify of media load. This action can fail, meaning that | |
721 | * the medium cannot be loaded. @errp is set then. | |
722 | * | |
723 | * If @load is false, notify of media eject. This can never fail. | |
724 | * | |
a7f53e26 MA |
725 | * Also send DEVICE_TRAY_MOVED events as appropriate. |
726 | */ | |
39829a01 | 727 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp) |
a7f53e26 MA |
728 | { |
729 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 730 | bool tray_was_open, tray_is_open; |
39829a01 | 731 | Error *local_err = NULL; |
a7f53e26 | 732 | |
2d76e724 KW |
733 | assert(!blk->legacy_dev); |
734 | ||
f1f57066 | 735 | tray_was_open = blk_dev_is_tray_open(blk); |
39829a01 KW |
736 | blk->dev_ops->change_media_cb(blk->dev_opaque, load, &local_err); |
737 | if (local_err) { | |
738 | assert(load == true); | |
739 | error_propagate(errp, local_err); | |
740 | return; | |
741 | } | |
f1f57066 HR |
742 | tray_is_open = blk_dev_is_tray_open(blk); |
743 | ||
744 | if (tray_was_open != tray_is_open) { | |
2d76e724 KW |
745 | char *id = blk_get_attached_dev_id(blk); |
746 | qapi_event_send_device_tray_moved(blk_name(blk), id, tray_is_open, | |
f1f57066 | 747 | &error_abort); |
2d76e724 | 748 | g_free(id); |
a7f53e26 MA |
749 | } |
750 | } | |
751 | } | |
752 | ||
5c8cab48 KW |
753 | static void blk_root_change_media(BdrvChild *child, bool load) |
754 | { | |
39829a01 | 755 | blk_dev_change_media_cb(child->opaque, load, NULL); |
5c8cab48 KW |
756 | } |
757 | ||
a7f53e26 MA |
758 | /* |
759 | * Does @blk's attached device model have removable media? | |
760 | * %true if no device model is attached. | |
761 | */ | |
762 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
763 | { | |
764 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
765 | } | |
766 | ||
8f3a73bc HR |
767 | /* |
768 | * Does @blk's attached device model have a tray? | |
769 | */ | |
770 | bool blk_dev_has_tray(BlockBackend *blk) | |
771 | { | |
772 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
773 | } | |
774 | ||
a7f53e26 MA |
775 | /* |
776 | * Notify @blk's attached device model of a media eject request. | |
777 | * If @force is true, the medium is about to be yanked out forcefully. | |
778 | */ | |
779 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 780 | { |
a7f53e26 MA |
781 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
782 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
783 | } | |
4be74634 MA |
784 | } |
785 | ||
a7f53e26 MA |
786 | /* |
787 | * Does @blk's attached device model have a tray, and is it open? | |
788 | */ | |
789 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 790 | { |
8f3a73bc | 791 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
792 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
793 | } | |
794 | return false; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Does @blk's attached device model have the medium locked? | |
799 | * %false if the device model has no such lock. | |
800 | */ | |
801 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
802 | { | |
803 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
804 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
805 | } | |
806 | return false; | |
807 | } | |
808 | ||
809 | /* | |
810 | * Notify @blk's attached device model of a backend size change. | |
811 | */ | |
5c8cab48 | 812 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 813 | { |
5c8cab48 KW |
814 | BlockBackend *blk = child->opaque; |
815 | ||
a7f53e26 MA |
816 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
817 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
818 | } | |
819 | } | |
820 | ||
821 | void blk_iostatus_enable(BlockBackend *blk) | |
822 | { | |
373340b2 HR |
823 | blk->iostatus_enabled = true; |
824 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
825 | } | |
826 | ||
827 | /* The I/O status is only enabled if the drive explicitly | |
828 | * enables it _and_ the VM is configured to stop on errors */ | |
829 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
830 | { | |
831 | return (blk->iostatus_enabled && | |
832 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
833 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
834 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
835 | } | |
836 | ||
837 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
838 | { | |
839 | return blk->iostatus; | |
840 | } | |
841 | ||
842 | void blk_iostatus_disable(BlockBackend *blk) | |
843 | { | |
844 | blk->iostatus_enabled = false; | |
845 | } | |
846 | ||
847 | void blk_iostatus_reset(BlockBackend *blk) | |
848 | { | |
849 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 850 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 851 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
852 | if (bs && bs->job) { |
853 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
854 | } |
855 | } | |
856 | } | |
857 | ||
858 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
859 | { | |
860 | assert(blk_iostatus_is_enabled(blk)); | |
861 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
862 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
863 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
864 | } | |
4be74634 MA |
865 | } |
866 | ||
c10c9d96 KW |
867 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
868 | { | |
869 | blk->allow_write_beyond_eof = allow; | |
870 | } | |
871 | ||
e7f7d676 HR |
872 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
873 | size_t size) | |
874 | { | |
875 | int64_t len; | |
876 | ||
877 | if (size > INT_MAX) { | |
878 | return -EIO; | |
879 | } | |
880 | ||
c09ba36c | 881 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
882 | return -ENOMEDIUM; |
883 | } | |
884 | ||
e7f7d676 HR |
885 | if (offset < 0) { |
886 | return -EIO; | |
887 | } | |
888 | ||
c10c9d96 KW |
889 | if (!blk->allow_write_beyond_eof) { |
890 | len = blk_getlength(blk); | |
891 | if (len < 0) { | |
892 | return len; | |
893 | } | |
894 | ||
895 | if (offset > len || len - offset < size) { | |
896 | return -EIO; | |
897 | } | |
e7f7d676 HR |
898 | } |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
1e98fefd KW |
903 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
904 | unsigned int bytes, QEMUIOVector *qiov, | |
905 | BdrvRequestFlags flags) | |
4be74634 | 906 | { |
1e98fefd | 907 | int ret; |
99723548 | 908 | BlockDriverState *bs = blk_bs(blk); |
1e98fefd | 909 | |
99723548 | 910 | trace_blk_co_preadv(blk, bs, offset, bytes, flags); |
1e98fefd KW |
911 | |
912 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
913 | if (ret < 0) { |
914 | return ret; | |
915 | } | |
916 | ||
99723548 PB |
917 | bdrv_inc_in_flight(bs); |
918 | ||
441565b2 KW |
919 | /* throttling disk I/O */ |
920 | if (blk->public.throttle_state) { | |
921 | throttle_group_co_io_limits_intercept(blk, bytes, false); | |
922 | } | |
923 | ||
99723548 PB |
924 | ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
925 | bdrv_dec_in_flight(bs); | |
926 | return ret; | |
1bf1cbc9 KW |
927 | } |
928 | ||
1e98fefd KW |
929 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
930 | unsigned int bytes, QEMUIOVector *qiov, | |
931 | BdrvRequestFlags flags) | |
a8823a3b | 932 | { |
bfd18d1e | 933 | int ret; |
99723548 | 934 | BlockDriverState *bs = blk_bs(blk); |
bfd18d1e | 935 | |
99723548 | 936 | trace_blk_co_pwritev(blk, bs, offset, bytes, flags); |
1e98fefd | 937 | |
bfd18d1e | 938 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
939 | if (ret < 0) { |
940 | return ret; | |
941 | } | |
942 | ||
99723548 PB |
943 | bdrv_inc_in_flight(bs); |
944 | ||
441565b2 KW |
945 | /* throttling disk I/O */ |
946 | if (blk->public.throttle_state) { | |
947 | throttle_group_co_io_limits_intercept(blk, bytes, true); | |
948 | } | |
949 | ||
bfd18d1e KW |
950 | if (!blk->enable_write_cache) { |
951 | flags |= BDRV_REQ_FUA; | |
952 | } | |
953 | ||
99723548 PB |
954 | ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
955 | bdrv_dec_in_flight(bs); | |
956 | return ret; | |
a8823a3b KW |
957 | } |
958 | ||
1bf1cbc9 KW |
959 | typedef struct BlkRwCo { |
960 | BlockBackend *blk; | |
961 | int64_t offset; | |
962 | QEMUIOVector *qiov; | |
963 | int ret; | |
964 | BdrvRequestFlags flags; | |
965 | } BlkRwCo; | |
966 | ||
967 | static void blk_read_entry(void *opaque) | |
968 | { | |
969 | BlkRwCo *rwco = opaque; | |
970 | ||
971 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
972 | rwco->qiov, rwco->flags); | |
973 | } | |
974 | ||
a8823a3b KW |
975 | static void blk_write_entry(void *opaque) |
976 | { | |
977 | BlkRwCo *rwco = opaque; | |
978 | ||
979 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
980 | rwco->qiov, rwco->flags); | |
981 | } | |
982 | ||
a55d3fba KW |
983 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
984 | int64_t bytes, CoroutineEntry co_entry, | |
985 | BdrvRequestFlags flags) | |
1bf1cbc9 | 986 | { |
1bf1cbc9 KW |
987 | QEMUIOVector qiov; |
988 | struct iovec iov; | |
1bf1cbc9 KW |
989 | BlkRwCo rwco; |
990 | ||
1bf1cbc9 KW |
991 | iov = (struct iovec) { |
992 | .iov_base = buf, | |
a55d3fba | 993 | .iov_len = bytes, |
1bf1cbc9 KW |
994 | }; |
995 | qemu_iovec_init_external(&qiov, &iov, 1); | |
996 | ||
997 | rwco = (BlkRwCo) { | |
998 | .blk = blk, | |
a55d3fba | 999 | .offset = offset, |
1bf1cbc9 | 1000 | .qiov = &qiov, |
fc1453cd | 1001 | .flags = flags, |
1bf1cbc9 KW |
1002 | .ret = NOT_DONE, |
1003 | }; | |
1004 | ||
35f106e6 PB |
1005 | if (qemu_in_coroutine()) { |
1006 | /* Fast-path if already in coroutine context */ | |
1007 | co_entry(&rwco); | |
1008 | } else { | |
1009 | Coroutine *co = qemu_coroutine_create(co_entry, &rwco); | |
1010 | qemu_coroutine_enter(co); | |
1011 | BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE); | |
1012 | } | |
1bf1cbc9 KW |
1013 | |
1014 | return rwco.ret; | |
4be74634 MA |
1015 | } |
1016 | ||
b7d17f9f EB |
1017 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
1018 | int count) | |
4be74634 | 1019 | { |
5bd51196 KW |
1020 | int ret; |
1021 | ||
b7d17f9f | 1022 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1023 | if (ret < 0) { |
1024 | return ret; | |
1025 | } | |
1026 | ||
c2066af0 | 1027 | blk_root_drained_begin(blk->root); |
b7d17f9f | 1028 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 1029 | blk_root_drained_end(blk->root); |
5bd51196 | 1030 | return ret; |
4be74634 MA |
1031 | } |
1032 | ||
d004bd52 EB |
1033 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1034 | int count, BdrvRequestFlags flags) | |
0df89e8e | 1035 | { |
983a1600 EB |
1036 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
1037 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
1038 | } |
1039 | ||
720ff280 KW |
1040 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
1041 | { | |
1042 | return bdrv_make_zero(blk->root, flags); | |
1043 | } | |
1044 | ||
e7f7d676 HR |
1045 | static void error_callback_bh(void *opaque) |
1046 | { | |
1047 | struct BlockBackendAIOCB *acb = opaque; | |
99723548 PB |
1048 | |
1049 | bdrv_dec_in_flight(acb->common.bs); | |
e7f7d676 HR |
1050 | acb->common.cb(acb->common.opaque, acb->ret); |
1051 | qemu_aio_unref(acb); | |
1052 | } | |
1053 | ||
ca78ecfa PL |
1054 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
1055 | BlockCompletionFunc *cb, | |
1056 | void *opaque, int ret) | |
e7f7d676 HR |
1057 | { |
1058 | struct BlockBackendAIOCB *acb; | |
e7f7d676 | 1059 | |
99723548 | 1060 | bdrv_inc_in_flight(blk_bs(blk)); |
e7f7d676 | 1061 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); |
4981bdec | 1062 | acb->blk = blk; |
e7f7d676 HR |
1063 | acb->ret = ret; |
1064 | ||
fffb6e12 | 1065 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), error_callback_bh, acb); |
e7f7d676 HR |
1066 | return &acb->common; |
1067 | } | |
1068 | ||
57d6a428 KW |
1069 | typedef struct BlkAioEmAIOCB { |
1070 | BlockAIOCB common; | |
1071 | BlkRwCo rwco; | |
7fa84cd8 | 1072 | int bytes; |
57d6a428 | 1073 | bool has_returned; |
57d6a428 KW |
1074 | } BlkAioEmAIOCB; |
1075 | ||
1076 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
1077 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
1078 | }; | |
1079 | ||
1080 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
1081 | { | |
57d6a428 | 1082 | if (acb->has_returned) { |
99723548 | 1083 | bdrv_dec_in_flight(acb->common.bs); |
57d6a428 KW |
1084 | acb->common.cb(acb->common.opaque, acb->rwco.ret); |
1085 | qemu_aio_unref(acb); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | static void blk_aio_complete_bh(void *opaque) | |
1090 | { | |
fffb6e12 | 1091 | BlkAioEmAIOCB *acb = opaque; |
fffb6e12 PB |
1092 | assert(acb->has_returned); |
1093 | blk_aio_complete(acb); | |
57d6a428 KW |
1094 | } |
1095 | ||
7fa84cd8 | 1096 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
1097 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
1098 | BdrvRequestFlags flags, | |
1099 | BlockCompletionFunc *cb, void *opaque) | |
1100 | { | |
1101 | BlkAioEmAIOCB *acb; | |
1102 | Coroutine *co; | |
1103 | ||
99723548 | 1104 | bdrv_inc_in_flight(blk_bs(blk)); |
57d6a428 KW |
1105 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); |
1106 | acb->rwco = (BlkRwCo) { | |
1107 | .blk = blk, | |
1108 | .offset = offset, | |
1109 | .qiov = qiov, | |
1110 | .flags = flags, | |
1111 | .ret = NOT_DONE, | |
1112 | }; | |
7fa84cd8 | 1113 | acb->bytes = bytes; |
57d6a428 KW |
1114 | acb->has_returned = false; |
1115 | ||
0b8b8753 PB |
1116 | co = qemu_coroutine_create(co_entry, acb); |
1117 | qemu_coroutine_enter(co); | |
57d6a428 KW |
1118 | |
1119 | acb->has_returned = true; | |
1120 | if (acb->rwco.ret != NOT_DONE) { | |
fffb6e12 PB |
1121 | aio_bh_schedule_oneshot(blk_get_aio_context(blk), |
1122 | blk_aio_complete_bh, acb); | |
57d6a428 KW |
1123 | } |
1124 | ||
1125 | return &acb->common; | |
1126 | } | |
1127 | ||
1128 | static void blk_aio_read_entry(void *opaque) | |
1129 | { | |
1130 | BlkAioEmAIOCB *acb = opaque; | |
1131 | BlkRwCo *rwco = &acb->rwco; | |
1132 | ||
7fa84cd8 KW |
1133 | assert(rwco->qiov->size == acb->bytes); |
1134 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1135 | rwco->qiov, rwco->flags); |
1136 | blk_aio_complete(acb); | |
1137 | } | |
1138 | ||
1139 | static void blk_aio_write_entry(void *opaque) | |
1140 | { | |
1141 | BlkAioEmAIOCB *acb = opaque; | |
1142 | BlkRwCo *rwco = &acb->rwco; | |
1143 | ||
7fa84cd8 KW |
1144 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
1145 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
1146 | rwco->qiov, rwco->flags); |
1147 | blk_aio_complete(acb); | |
1148 | } | |
1149 | ||
d004bd52 EB |
1150 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1151 | int count, BdrvRequestFlags flags, | |
1152 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1153 | { |
983a1600 EB |
1154 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
1155 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
1156 | } |
1157 | ||
1158 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
1159 | { | |
a55d3fba | 1160 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
1161 | if (ret < 0) { |
1162 | return ret; | |
1163 | } | |
a55d3fba | 1164 | return count; |
4be74634 MA |
1165 | } |
1166 | ||
8341f00d EB |
1167 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1168 | BdrvRequestFlags flags) | |
4be74634 | 1169 | { |
8341f00d EB |
1170 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1171 | flags); | |
e7f7d676 HR |
1172 | if (ret < 0) { |
1173 | return ret; | |
1174 | } | |
a55d3fba | 1175 | return count; |
4be74634 MA |
1176 | } |
1177 | ||
1178 | int64_t blk_getlength(BlockBackend *blk) | |
1179 | { | |
c09ba36c HR |
1180 | if (!blk_is_available(blk)) { |
1181 | return -ENOMEDIUM; | |
1182 | } | |
1183 | ||
f21d96d0 | 1184 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1185 | } |
1186 | ||
1187 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1188 | { | |
f21d96d0 | 1189 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1190 | *nb_sectors_ptr = 0; |
1191 | } else { | |
f21d96d0 | 1192 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1193 | } |
4be74634 MA |
1194 | } |
1195 | ||
1ef01253 HR |
1196 | int64_t blk_nb_sectors(BlockBackend *blk) |
1197 | { | |
c09ba36c HR |
1198 | if (!blk_is_available(blk)) { |
1199 | return -ENOMEDIUM; | |
1200 | } | |
1201 | ||
f21d96d0 | 1202 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1203 | } |
1204 | ||
60cb2fa7 EB |
1205 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1206 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1207 | BlockCompletionFunc *cb, void *opaque) | |
1208 | { | |
1209 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1210 | blk_aio_read_entry, flags, cb, opaque); | |
1211 | } | |
1212 | ||
60cb2fa7 EB |
1213 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1214 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1215 | BlockCompletionFunc *cb, void *opaque) | |
1216 | { | |
1217 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1218 | blk_aio_write_entry, flags, cb, opaque); | |
1219 | } | |
1220 | ||
be07a889 KW |
1221 | static void blk_aio_flush_entry(void *opaque) |
1222 | { | |
1223 | BlkAioEmAIOCB *acb = opaque; | |
1224 | BlkRwCo *rwco = &acb->rwco; | |
1225 | ||
1226 | rwco->ret = blk_co_flush(rwco->blk); | |
1227 | blk_aio_complete(acb); | |
1228 | } | |
1229 | ||
4be74634 MA |
1230 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1231 | BlockCompletionFunc *cb, void *opaque) | |
1232 | { | |
be07a889 | 1233 | return blk_aio_prwv(blk, 0, 0, NULL, blk_aio_flush_entry, 0, cb, opaque); |
4be74634 MA |
1234 | } |
1235 | ||
8c2e3dd5 KW |
1236 | static void blk_aio_pdiscard_entry(void *opaque) |
1237 | { | |
1238 | BlkAioEmAIOCB *acb = opaque; | |
1239 | BlkRwCo *rwco = &acb->rwco; | |
1240 | ||
1241 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, acb->bytes); | |
1242 | blk_aio_complete(acb); | |
1243 | } | |
1244 | ||
1c6c4bb7 EB |
1245 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
1246 | int64_t offset, int count, | |
1247 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1248 | { |
8c2e3dd5 KW |
1249 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_pdiscard_entry, 0, |
1250 | cb, opaque); | |
4be74634 MA |
1251 | } |
1252 | ||
1253 | void blk_aio_cancel(BlockAIOCB *acb) | |
1254 | { | |
1255 | bdrv_aio_cancel(acb); | |
1256 | } | |
1257 | ||
1258 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1259 | { | |
1260 | bdrv_aio_cancel_async(acb); | |
1261 | } | |
1262 | ||
48af776a | 1263 | int blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
4be74634 | 1264 | { |
c09ba36c HR |
1265 | if (!blk_is_available(blk)) { |
1266 | return -ENOMEDIUM; | |
1267 | } | |
1268 | ||
48af776a KW |
1269 | return bdrv_co_ioctl(blk_bs(blk), req, buf); |
1270 | } | |
1271 | ||
1272 | static void blk_ioctl_entry(void *opaque) | |
1273 | { | |
1274 | BlkRwCo *rwco = opaque; | |
1275 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1276 | rwco->qiov->iov[0].iov_base); | |
1277 | } | |
1278 | ||
1279 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) | |
1280 | { | |
1281 | return blk_prw(blk, req, buf, 0, blk_ioctl_entry, 0); | |
1282 | } | |
1283 | ||
1284 | static void blk_aio_ioctl_entry(void *opaque) | |
1285 | { | |
1286 | BlkAioEmAIOCB *acb = opaque; | |
1287 | BlkRwCo *rwco = &acb->rwco; | |
1288 | ||
1289 | rwco->ret = blk_co_ioctl(rwco->blk, rwco->offset, | |
1290 | rwco->qiov->iov[0].iov_base); | |
1291 | blk_aio_complete(acb); | |
4be74634 MA |
1292 | } |
1293 | ||
1294 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1295 | BlockCompletionFunc *cb, void *opaque) | |
1296 | { | |
48af776a KW |
1297 | QEMUIOVector qiov; |
1298 | struct iovec iov; | |
1299 | ||
1300 | iov = (struct iovec) { | |
1301 | .iov_base = buf, | |
1302 | .iov_len = 0, | |
1303 | }; | |
1304 | qemu_iovec_init_external(&qiov, &iov, 1); | |
c09ba36c | 1305 | |
48af776a | 1306 | return blk_aio_prwv(blk, req, 0, &qiov, blk_aio_ioctl_entry, 0, cb, opaque); |
4be74634 MA |
1307 | } |
1308 | ||
1c6c4bb7 | 1309 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count) |
2bb0dce7 | 1310 | { |
1c6c4bb7 | 1311 | int ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1312 | if (ret < 0) { |
1313 | return ret; | |
1314 | } | |
1315 | ||
1c6c4bb7 | 1316 | return bdrv_co_pdiscard(blk_bs(blk), offset, count); |
2bb0dce7 HR |
1317 | } |
1318 | ||
1319 | int blk_co_flush(BlockBackend *blk) | |
1320 | { | |
c09ba36c HR |
1321 | if (!blk_is_available(blk)) { |
1322 | return -ENOMEDIUM; | |
1323 | } | |
1324 | ||
f21d96d0 | 1325 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1326 | } |
1327 | ||
be07a889 | 1328 | static void blk_flush_entry(void *opaque) |
4be74634 | 1329 | { |
be07a889 KW |
1330 | BlkRwCo *rwco = opaque; |
1331 | rwco->ret = blk_co_flush(rwco->blk); | |
1332 | } | |
c09ba36c | 1333 | |
be07a889 KW |
1334 | int blk_flush(BlockBackend *blk) |
1335 | { | |
1336 | return blk_prw(blk, 0, NULL, 0, blk_flush_entry, 0); | |
4be74634 MA |
1337 | } |
1338 | ||
97b0385a AY |
1339 | void blk_drain(BlockBackend *blk) |
1340 | { | |
f21d96d0 KW |
1341 | if (blk_bs(blk)) { |
1342 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1343 | } |
97b0385a AY |
1344 | } |
1345 | ||
4be74634 MA |
1346 | void blk_drain_all(void) |
1347 | { | |
1348 | bdrv_drain_all(); | |
1349 | } | |
1350 | ||
373340b2 HR |
1351 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1352 | BlockdevOnError on_write_error) | |
1353 | { | |
1354 | blk->on_read_error = on_read_error; | |
1355 | blk->on_write_error = on_write_error; | |
1356 | } | |
1357 | ||
4be74634 MA |
1358 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1359 | { | |
373340b2 | 1360 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1361 | } |
1362 | ||
1363 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1364 | int error) | |
1365 | { | |
373340b2 HR |
1366 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1367 | ||
1368 | switch (on_err) { | |
1369 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1370 | return (error == ENOSPC) ? | |
1371 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1372 | case BLOCKDEV_ON_ERROR_STOP: | |
1373 | return BLOCK_ERROR_ACTION_STOP; | |
1374 | case BLOCKDEV_ON_ERROR_REPORT: | |
1375 | return BLOCK_ERROR_ACTION_REPORT; | |
1376 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1377 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1378 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1379 | default: |
1380 | abort(); | |
1381 | } | |
4be74634 MA |
1382 | } |
1383 | ||
373340b2 HR |
1384 | static void send_qmp_error_event(BlockBackend *blk, |
1385 | BlockErrorAction action, | |
1386 | bool is_read, int error) | |
1387 | { | |
1388 | IoOperationType optype; | |
1389 | ||
1390 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
2bf7e10f KW |
1391 | qapi_event_send_block_io_error(blk_name(blk), |
1392 | bdrv_get_node_name(blk_bs(blk)), optype, | |
1393 | action, blk_iostatus_is_enabled(blk), | |
373340b2 HR |
1394 | error == ENOSPC, strerror(error), |
1395 | &error_abort); | |
1396 | } | |
1397 | ||
1398 | /* This is done by device models because, while the block layer knows | |
1399 | * about the error, it does not know whether an operation comes from | |
1400 | * the device or the block layer (from a job, for example). | |
1401 | */ | |
4be74634 MA |
1402 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1403 | bool is_read, int error) | |
1404 | { | |
373340b2 HR |
1405 | assert(error >= 0); |
1406 | ||
1407 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1408 | /* First set the iostatus, so that "info block" returns an iostatus | |
1409 | * that matches the events raised so far (an additional error iostatus | |
1410 | * is fine, but not a lost one). | |
1411 | */ | |
1412 | blk_iostatus_set_err(blk, error); | |
1413 | ||
1414 | /* Then raise the request to stop the VM and the event. | |
1415 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1416 | * it ensures that the STOP event always comes after the | |
1417 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1418 | * can observe the STOP event and do a "cont" before the STOP | |
1419 | * event is issued, the VM will not stop. In this case, vm_start() | |
1420 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1421 | */ | |
1422 | qemu_system_vmstop_request_prepare(); | |
1423 | send_qmp_error_event(blk, action, is_read, error); | |
1424 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1425 | } else { | |
1426 | send_qmp_error_event(blk, action, is_read, error); | |
1427 | } | |
4be74634 MA |
1428 | } |
1429 | ||
1430 | int blk_is_read_only(BlockBackend *blk) | |
1431 | { | |
f21d96d0 KW |
1432 | BlockDriverState *bs = blk_bs(blk); |
1433 | ||
1434 | if (bs) { | |
1435 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1436 | } else { |
1437 | return blk->root_state.read_only; | |
1438 | } | |
4be74634 MA |
1439 | } |
1440 | ||
1441 | int blk_is_sg(BlockBackend *blk) | |
1442 | { | |
f21d96d0 KW |
1443 | BlockDriverState *bs = blk_bs(blk); |
1444 | ||
1445 | if (!bs) { | |
a46fc9c9 HR |
1446 | return 0; |
1447 | } | |
1448 | ||
f21d96d0 | 1449 | return bdrv_is_sg(bs); |
4be74634 MA |
1450 | } |
1451 | ||
1452 | int blk_enable_write_cache(BlockBackend *blk) | |
1453 | { | |
bfd18d1e | 1454 | return blk->enable_write_cache; |
4be74634 MA |
1455 | } |
1456 | ||
1457 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1458 | { | |
bfd18d1e | 1459 | blk->enable_write_cache = wce; |
4be74634 MA |
1460 | } |
1461 | ||
2bb0dce7 HR |
1462 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1463 | { | |
f21d96d0 KW |
1464 | BlockDriverState *bs = blk_bs(blk); |
1465 | ||
1466 | if (!bs) { | |
c09ba36c HR |
1467 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1468 | return; | |
1469 | } | |
1470 | ||
f21d96d0 | 1471 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1472 | } |
1473 | ||
e031f750 | 1474 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1475 | { |
f21d96d0 KW |
1476 | BlockDriverState *bs = blk_bs(blk); |
1477 | ||
1478 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1479 | } |
1480 | ||
1481 | bool blk_is_available(BlockBackend *blk) | |
1482 | { | |
1483 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1484 | } |
1485 | ||
1486 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1487 | { | |
f21d96d0 KW |
1488 | BlockDriverState *bs = blk_bs(blk); |
1489 | ||
1490 | if (bs) { | |
1491 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1492 | } |
4be74634 MA |
1493 | } |
1494 | ||
1495 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1496 | { | |
f21d96d0 | 1497 | BlockDriverState *bs = blk_bs(blk); |
2d76e724 KW |
1498 | char *id; |
1499 | ||
1500 | /* blk_eject is only called by qdevified devices */ | |
1501 | assert(!blk->legacy_dev); | |
f21d96d0 KW |
1502 | |
1503 | if (bs) { | |
1504 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1505 | } |
c47ee043 JS |
1506 | |
1507 | /* Whether or not we ejected on the backend, | |
1508 | * the frontend experienced a tray event. */ | |
1509 | id = blk_get_attached_dev_id(blk); | |
1510 | qapi_event_send_device_tray_moved(blk_name(blk), id, | |
1511 | eject_flag, &error_abort); | |
1512 | g_free(id); | |
4be74634 MA |
1513 | } |
1514 | ||
1515 | int blk_get_flags(BlockBackend *blk) | |
1516 | { | |
f21d96d0 KW |
1517 | BlockDriverState *bs = blk_bs(blk); |
1518 | ||
1519 | if (bs) { | |
1520 | return bdrv_get_flags(bs); | |
061959e8 HR |
1521 | } else { |
1522 | return blk->root_state.open_flags; | |
1523 | } | |
4be74634 MA |
1524 | } |
1525 | ||
5def6b80 EB |
1526 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1527 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1528 | { |
f21d96d0 | 1529 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1530 | uint32_t max = 0; |
f21d96d0 KW |
1531 | |
1532 | if (bs) { | |
5def6b80 | 1533 | max = bs->bl.max_transfer; |
a46fc9c9 | 1534 | } |
5def6b80 | 1535 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1536 | } |
1537 | ||
648296e0 SH |
1538 | int blk_get_max_iov(BlockBackend *blk) |
1539 | { | |
f21d96d0 | 1540 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1541 | } |
1542 | ||
4be74634 MA |
1543 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1544 | { | |
68e9ec01 | 1545 | blk->guest_block_size = align; |
4be74634 MA |
1546 | } |
1547 | ||
f1c17521 PB |
1548 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1549 | { | |
f21d96d0 | 1550 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1551 | } |
1552 | ||
4be74634 MA |
1553 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1554 | { | |
f21d96d0 | 1555 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1556 | } |
1557 | ||
1558 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1559 | { | |
f21d96d0 KW |
1560 | BlockDriverState *bs = blk_bs(blk); |
1561 | ||
1562 | if (!bs) { | |
a46fc9c9 HR |
1563 | return false; |
1564 | } | |
1565 | ||
f21d96d0 | 1566 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1567 | } |
1568 | ||
1569 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1570 | { | |
f21d96d0 KW |
1571 | BlockDriverState *bs = blk_bs(blk); |
1572 | ||
1573 | if (bs) { | |
1574 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1575 | } |
4be74634 MA |
1576 | } |
1577 | ||
1578 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1579 | { | |
f21d96d0 KW |
1580 | BlockDriverState *bs = blk_bs(blk); |
1581 | ||
1582 | if (bs) { | |
1583 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1584 | } |
4be74634 MA |
1585 | } |
1586 | ||
1587 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1588 | { | |
f21d96d0 KW |
1589 | BlockDriverState *bs = blk_bs(blk); |
1590 | ||
1591 | if (bs) { | |
1592 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1593 | } |
4be74634 MA |
1594 | } |
1595 | ||
1596 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1597 | { | |
f21d96d0 KW |
1598 | BlockDriverState *bs = blk_bs(blk); |
1599 | ||
1600 | if (bs) { | |
1601 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1602 | } else { |
1603 | return qemu_get_aio_context(); | |
1604 | } | |
1605 | } | |
1606 | ||
1607 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1608 | { | |
1609 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1610 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1611 | } |
1612 | ||
1613 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1614 | { | |
f21d96d0 KW |
1615 | BlockDriverState *bs = blk_bs(blk); |
1616 | ||
1617 | if (bs) { | |
7ca7f0f6 KW |
1618 | if (blk->public.throttle_state) { |
1619 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); | |
1620 | } | |
f21d96d0 | 1621 | bdrv_set_aio_context(bs, new_context); |
7ca7f0f6 KW |
1622 | if (blk->public.throttle_state) { |
1623 | throttle_timers_attach_aio_context(&blk->public.throttle_timers, | |
1624 | new_context); | |
1625 | } | |
a46fc9c9 | 1626 | } |
4be74634 MA |
1627 | } |
1628 | ||
2019ba0a HR |
1629 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1630 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1631 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1632 | { | |
f21d96d0 KW |
1633 | BlockDriverState *bs = blk_bs(blk); |
1634 | ||
1635 | if (bs) { | |
1636 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1637 | detach_aio_context, opaque); |
1638 | } | |
2019ba0a HR |
1639 | } |
1640 | ||
1641 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1642 | void (*attached_aio_context)(AioContext *, | |
1643 | void *), | |
1644 | void (*detach_aio_context)(void *), | |
1645 | void *opaque) | |
1646 | { | |
f21d96d0 KW |
1647 | BlockDriverState *bs = blk_bs(blk); |
1648 | ||
1649 | if (bs) { | |
1650 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1651 | detach_aio_context, opaque); |
1652 | } | |
2019ba0a HR |
1653 | } |
1654 | ||
3301f6c6 HR |
1655 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1656 | { | |
1657 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1658 | } | |
1659 | ||
1660 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1661 | { | |
1662 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1663 | } | |
1664 | ||
4be74634 MA |
1665 | void blk_io_plug(BlockBackend *blk) |
1666 | { | |
f21d96d0 KW |
1667 | BlockDriverState *bs = blk_bs(blk); |
1668 | ||
1669 | if (bs) { | |
1670 | bdrv_io_plug(bs); | |
a46fc9c9 | 1671 | } |
4be74634 MA |
1672 | } |
1673 | ||
1674 | void blk_io_unplug(BlockBackend *blk) | |
1675 | { | |
f21d96d0 KW |
1676 | BlockDriverState *bs = blk_bs(blk); |
1677 | ||
1678 | if (bs) { | |
1679 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1680 | } |
4be74634 MA |
1681 | } |
1682 | ||
1683 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1684 | { | |
7f0e9da6 | 1685 | return &blk->stats; |
4be74634 MA |
1686 | } |
1687 | ||
1688 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1689 | BlockCompletionFunc *cb, void *opaque) | |
1690 | { | |
1691 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1692 | } | |
1ef01253 | 1693 | |
d004bd52 EB |
1694 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1695 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1696 | { |
983a1600 | 1697 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1698 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1699 | } |
1700 | ||
fe5c1355 PB |
1701 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1702 | int count) | |
1ef01253 | 1703 | { |
35fadca8 PB |
1704 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1705 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
1706 | } |
1707 | ||
1708 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1709 | { | |
c09ba36c HR |
1710 | if (!blk_is_available(blk)) { |
1711 | return -ENOMEDIUM; | |
1712 | } | |
1713 | ||
52cdbc58 | 1714 | return bdrv_truncate(blk->root, offset); |
1ef01253 HR |
1715 | } |
1716 | ||
8c2e3dd5 | 1717 | static void blk_pdiscard_entry(void *opaque) |
1ef01253 | 1718 | { |
8c2e3dd5 KW |
1719 | BlkRwCo *rwco = opaque; |
1720 | rwco->ret = blk_co_pdiscard(rwco->blk, rwco->offset, rwco->qiov->size); | |
1721 | } | |
e7f7d676 | 1722 | |
8c2e3dd5 KW |
1723 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int count) |
1724 | { | |
1725 | return blk_prw(blk, offset, NULL, count, blk_pdiscard_entry, 0); | |
1ef01253 HR |
1726 | } |
1727 | ||
1728 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1729 | int64_t pos, int size) | |
1730 | { | |
bfd18d1e KW |
1731 | int ret; |
1732 | ||
c09ba36c HR |
1733 | if (!blk_is_available(blk)) { |
1734 | return -ENOMEDIUM; | |
1735 | } | |
1736 | ||
bfd18d1e KW |
1737 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1738 | if (ret < 0) { | |
1739 | return ret; | |
1740 | } | |
1741 | ||
1742 | if (ret == size && !blk->enable_write_cache) { | |
1743 | ret = bdrv_flush(blk_bs(blk)); | |
1744 | } | |
1745 | ||
1746 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1747 | } |
1748 | ||
1749 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1750 | { | |
c09ba36c HR |
1751 | if (!blk_is_available(blk)) { |
1752 | return -ENOMEDIUM; | |
1753 | } | |
1754 | ||
f21d96d0 | 1755 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1756 | } |
f0272c4d ET |
1757 | |
1758 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1759 | { | |
c09ba36c HR |
1760 | if (!blk_is_available(blk)) { |
1761 | return -ENOMEDIUM; | |
1762 | } | |
1763 | ||
f21d96d0 | 1764 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1765 | } |
1766 | ||
1767 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1768 | { | |
c09ba36c HR |
1769 | if (!blk_is_available(blk)) { |
1770 | return -ENOMEDIUM; | |
1771 | } | |
1772 | ||
f21d96d0 | 1773 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1774 | } |
281d22d8 HR |
1775 | |
1776 | /* | |
1777 | * Updates the BlockBackendRootState object with data from the currently | |
1778 | * attached BlockDriverState. | |
1779 | */ | |
1780 | void blk_update_root_state(BlockBackend *blk) | |
1781 | { | |
f21d96d0 | 1782 | assert(blk->root); |
281d22d8 | 1783 | |
f21d96d0 KW |
1784 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1785 | blk->root_state.read_only = blk->root->bs->read_only; | |
1786 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1787 | } |
1788 | ||
38cb18f5 | 1789 | /* |
b85114f8 KW |
1790 | * Returns the detect-zeroes setting to be used for bdrv_open() of a |
1791 | * BlockDriverState which is supposed to inherit the root state. | |
38cb18f5 | 1792 | */ |
b85114f8 | 1793 | bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk) |
38cb18f5 | 1794 | { |
b85114f8 | 1795 | return blk->root_state.detect_zeroes; |
38cb18f5 HR |
1796 | } |
1797 | ||
1798 | /* | |
1799 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1800 | * supposed to inherit the root state. | |
1801 | */ | |
1802 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1803 | { | |
1804 | int bs_flags; | |
1805 | ||
1806 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1807 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1808 | ||
1809 | return bs_flags; | |
1810 | } | |
1811 | ||
281d22d8 HR |
1812 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1813 | { | |
1814 | return &blk->root_state; | |
1815 | } | |
1393f212 HR |
1816 | |
1817 | int blk_commit_all(void) | |
1818 | { | |
fe1a9cbc HR |
1819 | BlockBackend *blk = NULL; |
1820 | ||
1821 | while ((blk = blk_all_next(blk)) != NULL) { | |
1822 | AioContext *aio_context = blk_get_aio_context(blk); | |
1823 | ||
1824 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1825 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1826 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1827 | if (ret < 0) { |
1828 | aio_context_release(aio_context); | |
1829 | return ret; | |
1830 | } | |
1831 | } | |
1832 | aio_context_release(aio_context); | |
1833 | } | |
1834 | return 0; | |
1835 | } | |
1836 | ||
97148076 KW |
1837 | |
1838 | /* throttling disk I/O limits */ | |
1839 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
1840 | { | |
1841 | throttle_group_config(blk, cfg); | |
1842 | } | |
1843 | ||
1844 | void blk_io_limits_disable(BlockBackend *blk) | |
1845 | { | |
1846 | assert(blk->public.throttle_state); | |
c2066af0 | 1847 | bdrv_drained_begin(blk_bs(blk)); |
97148076 | 1848 | throttle_group_unregister_blk(blk); |
c2066af0 | 1849 | bdrv_drained_end(blk_bs(blk)); |
97148076 KW |
1850 | } |
1851 | ||
1852 | /* should be called before blk_set_io_limits if a limit is set */ | |
1853 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
1854 | { | |
1855 | assert(!blk->public.throttle_state); | |
1856 | throttle_group_register_blk(blk, group); | |
1857 | } | |
1858 | ||
1859 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
1860 | { | |
1861 | /* this BB is not part of any group */ | |
1862 | if (!blk->public.throttle_state) { | |
1863 | return; | |
1864 | } | |
1865 | ||
1866 | /* this BB is a part of the same group than the one we want */ | |
1867 | if (!g_strcmp0(throttle_group_get_name(blk), group)) { | |
1868 | return; | |
1869 | } | |
1870 | ||
1871 | /* need to change the group this bs belong to */ | |
1872 | blk_io_limits_disable(blk); | |
1873 | blk_io_limits_enable(blk, group); | |
1874 | } | |
c2066af0 KW |
1875 | |
1876 | static void blk_root_drained_begin(BdrvChild *child) | |
1877 | { | |
1878 | BlockBackend *blk = child->opaque; | |
1879 | ||
f4d9cc88 JS |
1880 | if (++blk->quiesce_counter == 1) { |
1881 | if (blk->dev_ops && blk->dev_ops->drained_begin) { | |
1882 | blk->dev_ops->drained_begin(blk->dev_opaque); | |
1883 | } | |
1884 | } | |
1885 | ||
36fe1331 KW |
1886 | /* Note that blk->root may not be accessible here yet if we are just |
1887 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
1888 | ||
c2066af0 KW |
1889 | if (blk->public.io_limits_disabled++ == 0) { |
1890 | throttle_group_restart_blk(blk); | |
1891 | } | |
1892 | } | |
1893 | ||
1894 | static void blk_root_drained_end(BdrvChild *child) | |
1895 | { | |
1896 | BlockBackend *blk = child->opaque; | |
f4d9cc88 | 1897 | assert(blk->quiesce_counter); |
c2066af0 KW |
1898 | |
1899 | assert(blk->public.io_limits_disabled); | |
1900 | --blk->public.io_limits_disabled; | |
f4d9cc88 JS |
1901 | |
1902 | if (--blk->quiesce_counter == 0) { | |
1903 | if (blk->dev_ops && blk->dev_ops->drained_end) { | |
1904 | blk->dev_ops->drained_end(blk->dev_opaque); | |
1905 | } | |
1906 | } | |
c2066af0 | 1907 | } |