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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 */ | |
41 | /* TODO change to DeviceState when all users are qdevified */ | |
42 | const BlockDevOps *dev_ops; | |
43 | void *dev_opaque; | |
68e9ec01 HR |
44 | |
45 | /* the block size for which the guest device expects atomicity */ | |
46 | int guest_block_size; | |
7f0e9da6 | 47 | |
281d22d8 HR |
48 | /* If the BDS tree is removed, some of its options are stored here (which |
49 | * can be used to restore those options in the new BDS on insert) */ | |
50 | BlockBackendRootState root_state; | |
51 | ||
bfd18d1e KW |
52 | bool enable_write_cache; |
53 | ||
7f0e9da6 HR |
54 | /* I/O stats (display with "info blockstats"). */ |
55 | BlockAcctStats stats; | |
373340b2 HR |
56 | |
57 | BlockdevOnError on_read_error, on_write_error; | |
58 | bool iostatus_enabled; | |
59 | BlockDeviceIoStatus iostatus; | |
3301f6c6 | 60 | |
c10c9d96 KW |
61 | bool allow_write_beyond_eof; |
62 | ||
3301f6c6 | 63 | NotifierList remove_bs_notifiers, insert_bs_notifiers; |
26f54e9a MA |
64 | }; |
65 | ||
e7f7d676 HR |
66 | typedef struct BlockBackendAIOCB { |
67 | BlockAIOCB common; | |
68 | QEMUBH *bh; | |
4981bdec | 69 | BlockBackend *blk; |
e7f7d676 HR |
70 | int ret; |
71 | } BlockBackendAIOCB; | |
72 | ||
73 | static const AIOCBInfo block_backend_aiocb_info = { | |
4981bdec | 74 | .get_aio_context = blk_aiocb_get_aio_context, |
e7f7d676 HR |
75 | .aiocb_size = sizeof(BlockBackendAIOCB), |
76 | }; | |
77 | ||
8fb3c76c | 78 | static void drive_info_del(DriveInfo *dinfo); |
7c8eece4 | 79 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs); |
8fb3c76c | 80 | |
2cf22d6a HR |
81 | /* All BlockBackends */ |
82 | static QTAILQ_HEAD(, BlockBackend) block_backends = | |
83 | QTAILQ_HEAD_INITIALIZER(block_backends); | |
84 | ||
9492b0b9 HR |
85 | /* All BlockBackends referenced by the monitor and which are iterated through by |
86 | * blk_next() */ | |
87 | static QTAILQ_HEAD(, BlockBackend) monitor_block_backends = | |
88 | QTAILQ_HEAD_INITIALIZER(monitor_block_backends); | |
26f54e9a | 89 | |
f21d96d0 KW |
90 | static void blk_root_inherit_options(int *child_flags, QDict *child_options, |
91 | int parent_flags, QDict *parent_options) | |
92 | { | |
93 | /* We're not supposed to call this function for root nodes */ | |
94 | abort(); | |
95 | } | |
c2066af0 KW |
96 | static void blk_root_drained_begin(BdrvChild *child); |
97 | static void blk_root_drained_end(BdrvChild *child); | |
f21d96d0 | 98 | |
5c8cab48 KW |
99 | static void blk_root_change_media(BdrvChild *child, bool load); |
100 | static void blk_root_resize(BdrvChild *child); | |
101 | ||
4c265bf9 KW |
102 | static const char *blk_root_get_name(BdrvChild *child) |
103 | { | |
104 | return blk_name(child->opaque); | |
105 | } | |
106 | ||
f21d96d0 | 107 | static const BdrvChildRole child_root = { |
c2066af0 KW |
108 | .inherit_options = blk_root_inherit_options, |
109 | ||
5c8cab48 KW |
110 | .change_media = blk_root_change_media, |
111 | .resize = blk_root_resize, | |
4c265bf9 | 112 | .get_name = blk_root_get_name, |
5c8cab48 | 113 | |
c2066af0 KW |
114 | .drained_begin = blk_root_drained_begin, |
115 | .drained_end = blk_root_drained_end, | |
f21d96d0 KW |
116 | }; |
117 | ||
26f54e9a | 118 | /* |
efaa7c4e | 119 | * Create a new BlockBackend with a reference count of one. |
26f54e9a MA |
120 | * Store an error through @errp on failure, unless it's null. |
121 | * Return the new BlockBackend on success, null on failure. | |
122 | */ | |
109525ad | 123 | BlockBackend *blk_new(void) |
26f54e9a MA |
124 | { |
125 | BlockBackend *blk; | |
126 | ||
26f54e9a | 127 | blk = g_new0(BlockBackend, 1); |
26f54e9a | 128 | blk->refcnt = 1; |
0c3169df KW |
129 | blk_set_enable_write_cache(blk, true); |
130 | ||
27ccdd52 KW |
131 | qemu_co_queue_init(&blk->public.throttled_reqs[0]); |
132 | qemu_co_queue_init(&blk->public.throttled_reqs[1]); | |
133 | ||
3301f6c6 HR |
134 | notifier_list_init(&blk->remove_bs_notifiers); |
135 | notifier_list_init(&blk->insert_bs_notifiers); | |
27ccdd52 | 136 | |
2cf22d6a | 137 | QTAILQ_INSERT_TAIL(&block_backends, blk, link); |
26f54e9a MA |
138 | return blk; |
139 | } | |
140 | ||
7e7d56d9 | 141 | /* |
28eb9b12 | 142 | * Creates a new BlockBackend, opens a new BlockDriverState, and connects both. |
ca49a4fd HR |
143 | * |
144 | * Just as with bdrv_open(), after having called this function the reference to | |
145 | * @options belongs to the block layer (even on failure). | |
146 | * | |
147 | * TODO: Remove @filename and @flags; it should be possible to specify a whole | |
148 | * BDS tree just by specifying the @options QDict (or @reference, | |
149 | * alternatively). At the time of adding this function, this is not possible, | |
150 | * though, so callers of this function have to be able to specify @filename and | |
151 | * @flags. | |
152 | */ | |
efaa7c4e HR |
153 | BlockBackend *blk_new_open(const char *filename, const char *reference, |
154 | QDict *options, int flags, Error **errp) | |
ca49a4fd HR |
155 | { |
156 | BlockBackend *blk; | |
28eb9b12 | 157 | BlockDriverState *bs; |
ca49a4fd | 158 | |
109525ad | 159 | blk = blk_new(); |
5b363937 HR |
160 | bs = bdrv_open(filename, reference, options, flags, errp); |
161 | if (!bs) { | |
ca49a4fd HR |
162 | blk_unref(blk); |
163 | return NULL; | |
164 | } | |
165 | ||
36fe1331 | 166 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, blk); |
72e775c7 | 167 | |
ca49a4fd HR |
168 | return blk; |
169 | } | |
170 | ||
26f54e9a MA |
171 | static void blk_delete(BlockBackend *blk) |
172 | { | |
173 | assert(!blk->refcnt); | |
e5e78550 | 174 | assert(!blk->name); |
a7f53e26 | 175 | assert(!blk->dev); |
f21d96d0 | 176 | if (blk->root) { |
13855c6b | 177 | blk_remove_bs(blk); |
7e7d56d9 | 178 | } |
3301f6c6 HR |
179 | assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); |
180 | assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); | |
2cf22d6a | 181 | QTAILQ_REMOVE(&block_backends, blk, link); |
18e46a03 | 182 | drive_info_del(blk->legacy_dinfo); |
979e9b03 | 183 | block_acct_cleanup(&blk->stats); |
26f54e9a MA |
184 | g_free(blk); |
185 | } | |
186 | ||
8fb3c76c MA |
187 | static void drive_info_del(DriveInfo *dinfo) |
188 | { | |
189 | if (!dinfo) { | |
190 | return; | |
191 | } | |
192 | qemu_opts_del(dinfo->opts); | |
8fb3c76c MA |
193 | g_free(dinfo->serial); |
194 | g_free(dinfo); | |
195 | } | |
196 | ||
f636ae85 AG |
197 | int blk_get_refcnt(BlockBackend *blk) |
198 | { | |
199 | return blk ? blk->refcnt : 0; | |
200 | } | |
201 | ||
26f54e9a MA |
202 | /* |
203 | * Increment @blk's reference count. | |
204 | * @blk must not be null. | |
205 | */ | |
206 | void blk_ref(BlockBackend *blk) | |
207 | { | |
208 | blk->refcnt++; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Decrement @blk's reference count. | |
213 | * If this drops it to zero, destroy @blk. | |
214 | * For convenience, do nothing if @blk is null. | |
215 | */ | |
216 | void blk_unref(BlockBackend *blk) | |
217 | { | |
218 | if (blk) { | |
219 | assert(blk->refcnt > 0); | |
220 | if (!--blk->refcnt) { | |
221 | blk_delete(blk); | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
2cf22d6a HR |
226 | /* |
227 | * Behaves similarly to blk_next() but iterates over all BlockBackends, even the | |
228 | * ones which are hidden (i.e. are not referenced by the monitor). | |
229 | */ | |
230 | static BlockBackend *blk_all_next(BlockBackend *blk) | |
231 | { | |
232 | return blk ? QTAILQ_NEXT(blk, link) | |
233 | : QTAILQ_FIRST(&block_backends); | |
234 | } | |
235 | ||
d8da3cef HR |
236 | void blk_remove_all_bs(void) |
237 | { | |
74d1b8fc | 238 | BlockBackend *blk = NULL; |
d8da3cef | 239 | |
2cf22d6a | 240 | while ((blk = blk_all_next(blk)) != NULL) { |
d8da3cef HR |
241 | AioContext *ctx = blk_get_aio_context(blk); |
242 | ||
243 | aio_context_acquire(ctx); | |
f21d96d0 | 244 | if (blk->root) { |
d8da3cef HR |
245 | blk_remove_bs(blk); |
246 | } | |
247 | aio_context_release(ctx); | |
248 | } | |
249 | } | |
250 | ||
26f54e9a | 251 | /* |
9492b0b9 | 252 | * Return the monitor-owned BlockBackend after @blk. |
26f54e9a MA |
253 | * If @blk is null, return the first one. |
254 | * Else, return @blk's next sibling, which may be null. | |
255 | * | |
256 | * To iterate over all BlockBackends, do | |
257 | * for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { | |
258 | * ... | |
259 | * } | |
260 | */ | |
261 | BlockBackend *blk_next(BlockBackend *blk) | |
262 | { | |
9492b0b9 HR |
263 | return blk ? QTAILQ_NEXT(blk, monitor_link) |
264 | : QTAILQ_FIRST(&monitor_block_backends); | |
26f54e9a MA |
265 | } |
266 | ||
7c8eece4 KW |
267 | /* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by |
268 | * the monitor or attached to a BlockBackend */ | |
88be7b4b | 269 | BlockDriverState *bdrv_next(BdrvNextIterator *it) |
7c8eece4 | 270 | { |
88be7b4b | 271 | BlockDriverState *bs; |
981f4f57 | 272 | |
7c8eece4 KW |
273 | /* First, return all root nodes of BlockBackends. In order to avoid |
274 | * returning a BDS twice when multiple BBs refer to it, we only return it | |
275 | * if the BB is the first one in the parent list of the BDS. */ | |
276 | if (it->phase == BDRV_NEXT_BACKEND_ROOTS) { | |
277 | do { | |
278 | it->blk = blk_all_next(it->blk); | |
88be7b4b KW |
279 | bs = it->blk ? blk_bs(it->blk) : NULL; |
280 | } while (it->blk && (bs == NULL || bdrv_first_blk(bs) != it->blk)); | |
7c8eece4 | 281 | |
88be7b4b KW |
282 | if (bs) { |
283 | return bs; | |
7c8eece4 KW |
284 | } |
285 | it->phase = BDRV_NEXT_MONITOR_OWNED; | |
286 | } | |
287 | ||
288 | /* Then return the monitor-owned BDSes without a BB attached. Ignore all | |
289 | * BDSes that are attached to a BlockBackend here; they have been handled | |
290 | * by the above block already */ | |
981f4f57 | 291 | do { |
7c8eece4 | 292 | it->bs = bdrv_next_monitor_owned(it->bs); |
88be7b4b KW |
293 | bs = it->bs; |
294 | } while (bs && bdrv_has_blk(bs)); | |
295 | ||
296 | return bs; | |
297 | } | |
298 | ||
299 | BlockDriverState *bdrv_first(BdrvNextIterator *it) | |
300 | { | |
301 | *it = (BdrvNextIterator) { | |
302 | .phase = BDRV_NEXT_BACKEND_ROOTS, | |
303 | }; | |
981f4f57 | 304 | |
88be7b4b | 305 | return bdrv_next(it); |
981f4f57 HR |
306 | } |
307 | ||
e5e78550 HR |
308 | /* |
309 | * Add a BlockBackend into the list of backends referenced by the monitor, with | |
310 | * the given @name acting as the handle for the monitor. | |
311 | * Strictly for use by blockdev.c. | |
312 | * | |
313 | * @name must not be null or empty. | |
314 | * | |
315 | * Returns true on success and false on failure. In the latter case, an Error | |
316 | * object is returned through @errp. | |
317 | */ | |
318 | bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp) | |
319 | { | |
320 | assert(!blk->name); | |
321 | assert(name && name[0]); | |
322 | ||
323 | if (!id_wellformed(name)) { | |
324 | error_setg(errp, "Invalid device name"); | |
325 | return false; | |
326 | } | |
327 | if (blk_by_name(name)) { | |
328 | error_setg(errp, "Device with id '%s' already exists", name); | |
329 | return false; | |
330 | } | |
331 | if (bdrv_find_node(name)) { | |
332 | error_setg(errp, | |
333 | "Device name '%s' conflicts with an existing node name", | |
334 | name); | |
335 | return false; | |
336 | } | |
337 | ||
338 | blk->name = g_strdup(name); | |
339 | QTAILQ_INSERT_TAIL(&monitor_block_backends, blk, monitor_link); | |
340 | return true; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Remove a BlockBackend from the list of backends referenced by the monitor. | |
345 | * Strictly for use by blockdev.c. | |
346 | */ | |
347 | void monitor_remove_blk(BlockBackend *blk) | |
348 | { | |
349 | if (!blk->name) { | |
350 | return; | |
351 | } | |
352 | ||
353 | QTAILQ_REMOVE(&monitor_block_backends, blk, monitor_link); | |
354 | g_free(blk->name); | |
355 | blk->name = NULL; | |
356 | } | |
357 | ||
26f54e9a | 358 | /* |
7e7d56d9 | 359 | * Return @blk's name, a non-null string. |
e5e78550 | 360 | * Returns an empty string iff @blk is not referenced by the monitor. |
26f54e9a MA |
361 | */ |
362 | const char *blk_name(BlockBackend *blk) | |
363 | { | |
e5e78550 | 364 | return blk->name ?: ""; |
26f54e9a MA |
365 | } |
366 | ||
367 | /* | |
368 | * Return the BlockBackend with name @name if it exists, else null. | |
369 | * @name must not be null. | |
370 | */ | |
371 | BlockBackend *blk_by_name(const char *name) | |
372 | { | |
74d1b8fc | 373 | BlockBackend *blk = NULL; |
26f54e9a MA |
374 | |
375 | assert(name); | |
74d1b8fc | 376 | while ((blk = blk_next(blk)) != NULL) { |
26f54e9a MA |
377 | if (!strcmp(name, blk->name)) { |
378 | return blk; | |
379 | } | |
380 | } | |
381 | return NULL; | |
382 | } | |
7e7d56d9 MA |
383 | |
384 | /* | |
385 | * Return the BlockDriverState attached to @blk if any, else null. | |
386 | */ | |
387 | BlockDriverState *blk_bs(BlockBackend *blk) | |
388 | { | |
f21d96d0 | 389 | return blk->root ? blk->root->bs : NULL; |
7e7d56d9 MA |
390 | } |
391 | ||
7c8eece4 | 392 | static BlockBackend *bdrv_first_blk(BlockDriverState *bs) |
dde33812 KW |
393 | { |
394 | BdrvChild *child; | |
395 | QLIST_FOREACH(child, &bs->parents, next_parent) { | |
396 | if (child->role == &child_root) { | |
7c8eece4 | 397 | return child->opaque; |
dde33812 KW |
398 | } |
399 | } | |
400 | ||
7c8eece4 KW |
401 | return NULL; |
402 | } | |
403 | ||
404 | /* | |
405 | * Returns true if @bs has an associated BlockBackend. | |
406 | */ | |
407 | bool bdrv_has_blk(BlockDriverState *bs) | |
408 | { | |
409 | return bdrv_first_blk(bs) != NULL; | |
dde33812 KW |
410 | } |
411 | ||
b6c1bae5 KW |
412 | /* |
413 | * Returns true if @bs has only BlockBackends as parents. | |
414 | */ | |
415 | bool bdrv_is_root_node(BlockDriverState *bs) | |
416 | { | |
417 | BdrvChild *c; | |
418 | ||
419 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
420 | if (c->role != &child_root) { | |
421 | return false; | |
422 | } | |
423 | } | |
424 | ||
425 | return true; | |
426 | } | |
427 | ||
18e46a03 MA |
428 | /* |
429 | * Return @blk's DriveInfo if any, else null. | |
430 | */ | |
431 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
432 | { | |
433 | return blk->legacy_dinfo; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Set @blk's DriveInfo to @dinfo, and return it. | |
438 | * @blk must not have a DriveInfo set already. | |
439 | * No other BlockBackend may have the same DriveInfo set. | |
440 | */ | |
441 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
442 | { | |
443 | assert(!blk->legacy_dinfo); | |
444 | return blk->legacy_dinfo = dinfo; | |
445 | } | |
446 | ||
447 | /* | |
448 | * Return the BlockBackend with DriveInfo @dinfo. | |
449 | * It must exist. | |
450 | */ | |
451 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
452 | { | |
74d1b8fc | 453 | BlockBackend *blk = NULL; |
18e46a03 | 454 | |
74d1b8fc | 455 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
456 | if (blk->legacy_dinfo == dinfo) { |
457 | return blk; | |
458 | } | |
459 | } | |
460 | abort(); | |
461 | } | |
462 | ||
f2cd875d KW |
463 | /* |
464 | * Returns a pointer to the publicly accessible fields of @blk. | |
465 | */ | |
466 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
467 | { | |
468 | return &blk->public; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Returns a BlockBackend given the associated @public fields. | |
473 | */ | |
474 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
475 | { | |
476 | return container_of(public, BlockBackend, public); | |
477 | } | |
478 | ||
1c95f7e1 HR |
479 | /* |
480 | * Disassociates the currently associated BlockDriverState from @blk. | |
481 | */ | |
482 | void blk_remove_bs(BlockBackend *blk) | |
483 | { | |
3301f6c6 | 484 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
27ccdd52 | 485 | if (blk->public.throttle_state) { |
7ca7f0f6 | 486 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); |
a5614993 | 487 | } |
1c95f7e1 | 488 | |
7ca7f0f6 KW |
489 | blk_update_root_state(blk); |
490 | ||
f21d96d0 KW |
491 | bdrv_root_unref_child(blk->root); |
492 | blk->root = NULL; | |
1c95f7e1 HR |
493 | } |
494 | ||
0c3c36d6 HR |
495 | /* |
496 | * Associates a new BlockDriverState with @blk. | |
497 | */ | |
498 | void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) | |
499 | { | |
0c3c36d6 | 500 | bdrv_ref(bs); |
36fe1331 | 501 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, blk); |
3301f6c6 HR |
502 | |
503 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
7ca7f0f6 KW |
504 | if (blk->public.throttle_state) { |
505 | throttle_timers_attach_aio_context( | |
506 | &blk->public.throttle_timers, bdrv_get_aio_context(bs)); | |
507 | } | |
0c3c36d6 HR |
508 | } |
509 | ||
a7f53e26 MA |
510 | /* |
511 | * Attach device model @dev to @blk. | |
512 | * Return 0 on success, -EBUSY when a device model is attached already. | |
513 | */ | |
4be74634 | 514 | int blk_attach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 515 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 516 | { |
a7f53e26 MA |
517 | if (blk->dev) { |
518 | return -EBUSY; | |
519 | } | |
84ebe375 | 520 | blk_ref(blk); |
a7f53e26 | 521 | blk->dev = dev; |
373340b2 | 522 | blk_iostatus_reset(blk); |
a7f53e26 | 523 | return 0; |
4be74634 MA |
524 | } |
525 | ||
a7f53e26 MA |
526 | /* |
527 | * Attach device model @dev to @blk. | |
528 | * @blk must not have a device model attached already. | |
529 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
530 | */ | |
4be74634 MA |
531 | void blk_attach_dev_nofail(BlockBackend *blk, void *dev) |
532 | { | |
a7f53e26 MA |
533 | if (blk_attach_dev(blk, dev) < 0) { |
534 | abort(); | |
535 | } | |
4be74634 MA |
536 | } |
537 | ||
a7f53e26 MA |
538 | /* |
539 | * Detach device model @dev from @blk. | |
540 | * @dev must be currently attached to @blk. | |
541 | */ | |
4be74634 | 542 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 543 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 544 | { |
a7f53e26 MA |
545 | assert(blk->dev == dev); |
546 | blk->dev = NULL; | |
547 | blk->dev_ops = NULL; | |
548 | blk->dev_opaque = NULL; | |
68e9ec01 | 549 | blk->guest_block_size = 512; |
84ebe375 | 550 | blk_unref(blk); |
4be74634 MA |
551 | } |
552 | ||
a7f53e26 MA |
553 | /* |
554 | * Return the device model attached to @blk if any, else null. | |
555 | */ | |
4be74634 | 556 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
557 | /* TODO change to return DeviceState * when all users are qdevified */ |
558 | { | |
559 | return blk->dev; | |
560 | } | |
561 | ||
562 | /* | |
563 | * Set @blk's device model callbacks to @ops. | |
564 | * @opaque is the opaque argument to pass to the callbacks. | |
565 | * This is for use by device models. | |
566 | */ | |
567 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
568 | void *opaque) | |
569 | { | |
570 | blk->dev_ops = ops; | |
571 | blk->dev_opaque = opaque; | |
572 | } | |
573 | ||
574 | /* | |
575 | * Notify @blk's attached device model of media change. | |
576 | * If @load is true, notify of media load. | |
577 | * Else, notify of media eject. | |
578 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
579 | */ | |
580 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
581 | { | |
582 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 583 | bool tray_was_open, tray_is_open; |
a7f53e26 | 584 | |
f1f57066 | 585 | tray_was_open = blk_dev_is_tray_open(blk); |
a7f53e26 | 586 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); |
f1f57066 HR |
587 | tray_is_open = blk_dev_is_tray_open(blk); |
588 | ||
589 | if (tray_was_open != tray_is_open) { | |
590 | qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open, | |
591 | &error_abort); | |
a7f53e26 MA |
592 | } |
593 | } | |
594 | } | |
595 | ||
5c8cab48 KW |
596 | static void blk_root_change_media(BdrvChild *child, bool load) |
597 | { | |
598 | blk_dev_change_media_cb(child->opaque, load); | |
599 | } | |
600 | ||
a7f53e26 MA |
601 | /* |
602 | * Does @blk's attached device model have removable media? | |
603 | * %true if no device model is attached. | |
604 | */ | |
605 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
606 | { | |
607 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
608 | } | |
609 | ||
8f3a73bc HR |
610 | /* |
611 | * Does @blk's attached device model have a tray? | |
612 | */ | |
613 | bool blk_dev_has_tray(BlockBackend *blk) | |
614 | { | |
615 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
616 | } | |
617 | ||
a7f53e26 MA |
618 | /* |
619 | * Notify @blk's attached device model of a media eject request. | |
620 | * If @force is true, the medium is about to be yanked out forcefully. | |
621 | */ | |
622 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 623 | { |
a7f53e26 MA |
624 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
625 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
626 | } | |
4be74634 MA |
627 | } |
628 | ||
a7f53e26 MA |
629 | /* |
630 | * Does @blk's attached device model have a tray, and is it open? | |
631 | */ | |
632 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 633 | { |
8f3a73bc | 634 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
635 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
636 | } | |
637 | return false; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Does @blk's attached device model have the medium locked? | |
642 | * %false if the device model has no such lock. | |
643 | */ | |
644 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
645 | { | |
646 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
647 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
648 | } | |
649 | return false; | |
650 | } | |
651 | ||
652 | /* | |
653 | * Notify @blk's attached device model of a backend size change. | |
654 | */ | |
5c8cab48 | 655 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 656 | { |
5c8cab48 KW |
657 | BlockBackend *blk = child->opaque; |
658 | ||
a7f53e26 MA |
659 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
660 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
661 | } | |
662 | } | |
663 | ||
664 | void blk_iostatus_enable(BlockBackend *blk) | |
665 | { | |
373340b2 HR |
666 | blk->iostatus_enabled = true; |
667 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
668 | } | |
669 | ||
670 | /* The I/O status is only enabled if the drive explicitly | |
671 | * enables it _and_ the VM is configured to stop on errors */ | |
672 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
673 | { | |
674 | return (blk->iostatus_enabled && | |
675 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
676 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
677 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
678 | } | |
679 | ||
680 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
681 | { | |
682 | return blk->iostatus; | |
683 | } | |
684 | ||
685 | void blk_iostatus_disable(BlockBackend *blk) | |
686 | { | |
687 | blk->iostatus_enabled = false; | |
688 | } | |
689 | ||
690 | void blk_iostatus_reset(BlockBackend *blk) | |
691 | { | |
692 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 693 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 694 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
695 | if (bs && bs->job) { |
696 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
697 | } |
698 | } | |
699 | } | |
700 | ||
701 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
702 | { | |
703 | assert(blk_iostatus_is_enabled(blk)); | |
704 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
705 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
706 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
707 | } | |
4be74634 MA |
708 | } |
709 | ||
c10c9d96 KW |
710 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
711 | { | |
712 | blk->allow_write_beyond_eof = allow; | |
713 | } | |
714 | ||
e7f7d676 HR |
715 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
716 | size_t size) | |
717 | { | |
718 | int64_t len; | |
719 | ||
720 | if (size > INT_MAX) { | |
721 | return -EIO; | |
722 | } | |
723 | ||
c09ba36c | 724 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
725 | return -ENOMEDIUM; |
726 | } | |
727 | ||
e7f7d676 HR |
728 | if (offset < 0) { |
729 | return -EIO; | |
730 | } | |
731 | ||
c10c9d96 KW |
732 | if (!blk->allow_write_beyond_eof) { |
733 | len = blk_getlength(blk); | |
734 | if (len < 0) { | |
735 | return len; | |
736 | } | |
737 | ||
738 | if (offset > len || len - offset < size) { | |
739 | return -EIO; | |
740 | } | |
e7f7d676 HR |
741 | } |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
1e98fefd KW |
746 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
747 | unsigned int bytes, QEMUIOVector *qiov, | |
748 | BdrvRequestFlags flags) | |
4be74634 | 749 | { |
1e98fefd KW |
750 | int ret; |
751 | ||
752 | trace_blk_co_preadv(blk, blk_bs(blk), offset, bytes, flags); | |
753 | ||
754 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
755 | if (ret < 0) { |
756 | return ret; | |
757 | } | |
758 | ||
441565b2 KW |
759 | /* throttling disk I/O */ |
760 | if (blk->public.throttle_state) { | |
761 | throttle_group_co_io_limits_intercept(blk, bytes, false); | |
762 | } | |
763 | ||
a03ef88f | 764 | return bdrv_co_preadv(blk->root, offset, bytes, qiov, flags); |
1bf1cbc9 KW |
765 | } |
766 | ||
1e98fefd KW |
767 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
768 | unsigned int bytes, QEMUIOVector *qiov, | |
769 | BdrvRequestFlags flags) | |
a8823a3b | 770 | { |
bfd18d1e KW |
771 | int ret; |
772 | ||
1e98fefd KW |
773 | trace_blk_co_pwritev(blk, blk_bs(blk), offset, bytes, flags); |
774 | ||
bfd18d1e | 775 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
776 | if (ret < 0) { |
777 | return ret; | |
778 | } | |
779 | ||
441565b2 KW |
780 | /* throttling disk I/O */ |
781 | if (blk->public.throttle_state) { | |
782 | throttle_group_co_io_limits_intercept(blk, bytes, true); | |
783 | } | |
784 | ||
bfd18d1e KW |
785 | if (!blk->enable_write_cache) { |
786 | flags |= BDRV_REQ_FUA; | |
787 | } | |
788 | ||
a03ef88f | 789 | return bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags); |
a8823a3b KW |
790 | } |
791 | ||
1bf1cbc9 KW |
792 | typedef struct BlkRwCo { |
793 | BlockBackend *blk; | |
794 | int64_t offset; | |
795 | QEMUIOVector *qiov; | |
796 | int ret; | |
797 | BdrvRequestFlags flags; | |
798 | } BlkRwCo; | |
799 | ||
800 | static void blk_read_entry(void *opaque) | |
801 | { | |
802 | BlkRwCo *rwco = opaque; | |
803 | ||
804 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
805 | rwco->qiov, rwco->flags); | |
806 | } | |
807 | ||
a8823a3b KW |
808 | static void blk_write_entry(void *opaque) |
809 | { | |
810 | BlkRwCo *rwco = opaque; | |
811 | ||
812 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
813 | rwco->qiov, rwco->flags); | |
814 | } | |
815 | ||
a55d3fba KW |
816 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
817 | int64_t bytes, CoroutineEntry co_entry, | |
818 | BdrvRequestFlags flags) | |
1bf1cbc9 KW |
819 | { |
820 | AioContext *aio_context; | |
821 | QEMUIOVector qiov; | |
822 | struct iovec iov; | |
823 | Coroutine *co; | |
824 | BlkRwCo rwco; | |
825 | ||
1bf1cbc9 KW |
826 | iov = (struct iovec) { |
827 | .iov_base = buf, | |
a55d3fba | 828 | .iov_len = bytes, |
1bf1cbc9 KW |
829 | }; |
830 | qemu_iovec_init_external(&qiov, &iov, 1); | |
831 | ||
832 | rwco = (BlkRwCo) { | |
833 | .blk = blk, | |
a55d3fba | 834 | .offset = offset, |
1bf1cbc9 | 835 | .qiov = &qiov, |
fc1453cd | 836 | .flags = flags, |
1bf1cbc9 KW |
837 | .ret = NOT_DONE, |
838 | }; | |
839 | ||
0b8b8753 PB |
840 | co = qemu_coroutine_create(co_entry, &rwco); |
841 | qemu_coroutine_enter(co); | |
1bf1cbc9 KW |
842 | |
843 | aio_context = blk_get_aio_context(blk); | |
844 | while (rwco.ret == NOT_DONE) { | |
845 | aio_poll(aio_context, true); | |
846 | } | |
847 | ||
848 | return rwco.ret; | |
4be74634 MA |
849 | } |
850 | ||
b7d17f9f EB |
851 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
852 | int count) | |
4be74634 | 853 | { |
5bd51196 KW |
854 | int ret; |
855 | ||
b7d17f9f | 856 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
857 | if (ret < 0) { |
858 | return ret; | |
859 | } | |
860 | ||
c2066af0 | 861 | blk_root_drained_begin(blk->root); |
b7d17f9f | 862 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 863 | blk_root_drained_end(blk->root); |
5bd51196 | 864 | return ret; |
4be74634 MA |
865 | } |
866 | ||
d004bd52 EB |
867 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
868 | int count, BdrvRequestFlags flags) | |
0df89e8e | 869 | { |
983a1600 EB |
870 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
871 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
872 | } |
873 | ||
720ff280 KW |
874 | int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags) |
875 | { | |
876 | return bdrv_make_zero(blk->root, flags); | |
877 | } | |
878 | ||
e7f7d676 HR |
879 | static void error_callback_bh(void *opaque) |
880 | { | |
881 | struct BlockBackendAIOCB *acb = opaque; | |
882 | qemu_bh_delete(acb->bh); | |
883 | acb->common.cb(acb->common.opaque, acb->ret); | |
884 | qemu_aio_unref(acb); | |
885 | } | |
886 | ||
ca78ecfa PL |
887 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
888 | BlockCompletionFunc *cb, | |
889 | void *opaque, int ret) | |
e7f7d676 HR |
890 | { |
891 | struct BlockBackendAIOCB *acb; | |
892 | QEMUBH *bh; | |
893 | ||
894 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); | |
4981bdec | 895 | acb->blk = blk; |
e7f7d676 HR |
896 | acb->ret = ret; |
897 | ||
898 | bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb); | |
899 | acb->bh = bh; | |
900 | qemu_bh_schedule(bh); | |
901 | ||
902 | return &acb->common; | |
903 | } | |
904 | ||
57d6a428 KW |
905 | typedef struct BlkAioEmAIOCB { |
906 | BlockAIOCB common; | |
907 | BlkRwCo rwco; | |
7fa84cd8 | 908 | int bytes; |
57d6a428 KW |
909 | bool has_returned; |
910 | QEMUBH* bh; | |
911 | } BlkAioEmAIOCB; | |
912 | ||
913 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
914 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
915 | }; | |
916 | ||
917 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
918 | { | |
919 | if (acb->bh) { | |
920 | assert(acb->has_returned); | |
921 | qemu_bh_delete(acb->bh); | |
922 | } | |
923 | if (acb->has_returned) { | |
924 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
925 | qemu_aio_unref(acb); | |
926 | } | |
927 | } | |
928 | ||
929 | static void blk_aio_complete_bh(void *opaque) | |
930 | { | |
931 | blk_aio_complete(opaque); | |
932 | } | |
933 | ||
7fa84cd8 | 934 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
935 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
936 | BdrvRequestFlags flags, | |
937 | BlockCompletionFunc *cb, void *opaque) | |
938 | { | |
939 | BlkAioEmAIOCB *acb; | |
940 | Coroutine *co; | |
941 | ||
942 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
943 | acb->rwco = (BlkRwCo) { | |
944 | .blk = blk, | |
945 | .offset = offset, | |
946 | .qiov = qiov, | |
947 | .flags = flags, | |
948 | .ret = NOT_DONE, | |
949 | }; | |
7fa84cd8 | 950 | acb->bytes = bytes; |
57d6a428 KW |
951 | acb->bh = NULL; |
952 | acb->has_returned = false; | |
953 | ||
0b8b8753 PB |
954 | co = qemu_coroutine_create(co_entry, acb); |
955 | qemu_coroutine_enter(co); | |
57d6a428 KW |
956 | |
957 | acb->has_returned = true; | |
958 | if (acb->rwco.ret != NOT_DONE) { | |
959 | acb->bh = aio_bh_new(blk_get_aio_context(blk), blk_aio_complete_bh, acb); | |
960 | qemu_bh_schedule(acb->bh); | |
961 | } | |
962 | ||
963 | return &acb->common; | |
964 | } | |
965 | ||
966 | static void blk_aio_read_entry(void *opaque) | |
967 | { | |
968 | BlkAioEmAIOCB *acb = opaque; | |
969 | BlkRwCo *rwco = &acb->rwco; | |
970 | ||
7fa84cd8 KW |
971 | assert(rwco->qiov->size == acb->bytes); |
972 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
973 | rwco->qiov, rwco->flags); |
974 | blk_aio_complete(acb); | |
975 | } | |
976 | ||
977 | static void blk_aio_write_entry(void *opaque) | |
978 | { | |
979 | BlkAioEmAIOCB *acb = opaque; | |
980 | BlkRwCo *rwco = &acb->rwco; | |
981 | ||
7fa84cd8 KW |
982 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
983 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
984 | rwco->qiov, rwco->flags); |
985 | blk_aio_complete(acb); | |
986 | } | |
987 | ||
d004bd52 EB |
988 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
989 | int count, BdrvRequestFlags flags, | |
990 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 991 | { |
983a1600 EB |
992 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
993 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
994 | } |
995 | ||
996 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
997 | { | |
a55d3fba | 998 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
999 | if (ret < 0) { |
1000 | return ret; | |
1001 | } | |
a55d3fba | 1002 | return count; |
4be74634 MA |
1003 | } |
1004 | ||
8341f00d EB |
1005 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1006 | BdrvRequestFlags flags) | |
4be74634 | 1007 | { |
8341f00d EB |
1008 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1009 | flags); | |
e7f7d676 HR |
1010 | if (ret < 0) { |
1011 | return ret; | |
1012 | } | |
a55d3fba | 1013 | return count; |
4be74634 MA |
1014 | } |
1015 | ||
1016 | int64_t blk_getlength(BlockBackend *blk) | |
1017 | { | |
c09ba36c HR |
1018 | if (!blk_is_available(blk)) { |
1019 | return -ENOMEDIUM; | |
1020 | } | |
1021 | ||
f21d96d0 | 1022 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1023 | } |
1024 | ||
1025 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1026 | { | |
f21d96d0 | 1027 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1028 | *nb_sectors_ptr = 0; |
1029 | } else { | |
f21d96d0 | 1030 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1031 | } |
4be74634 MA |
1032 | } |
1033 | ||
1ef01253 HR |
1034 | int64_t blk_nb_sectors(BlockBackend *blk) |
1035 | { | |
c09ba36c HR |
1036 | if (!blk_is_available(blk)) { |
1037 | return -ENOMEDIUM; | |
1038 | } | |
1039 | ||
f21d96d0 | 1040 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1041 | } |
1042 | ||
60cb2fa7 EB |
1043 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1044 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1045 | BlockCompletionFunc *cb, void *opaque) | |
1046 | { | |
1047 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1048 | blk_aio_read_entry, flags, cb, opaque); | |
1049 | } | |
1050 | ||
60cb2fa7 EB |
1051 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1052 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1053 | BlockCompletionFunc *cb, void *opaque) | |
1054 | { | |
1055 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1056 | blk_aio_write_entry, flags, cb, opaque); | |
1057 | } | |
1058 | ||
4be74634 MA |
1059 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1060 | BlockCompletionFunc *cb, void *opaque) | |
1061 | { | |
c09ba36c | 1062 | if (!blk_is_available(blk)) { |
ca78ecfa | 1063 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1064 | } |
1065 | ||
f21d96d0 | 1066 | return bdrv_aio_flush(blk_bs(blk), cb, opaque); |
4be74634 MA |
1067 | } |
1068 | ||
1c6c4bb7 EB |
1069 | BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, |
1070 | int64_t offset, int count, | |
1071 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 1072 | { |
1c6c4bb7 | 1073 | int ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 | 1074 | if (ret < 0) { |
ca78ecfa | 1075 | return blk_abort_aio_request(blk, cb, opaque, ret); |
e7f7d676 HR |
1076 | } |
1077 | ||
1c6c4bb7 | 1078 | return bdrv_aio_pdiscard(blk_bs(blk), offset, count, cb, opaque); |
4be74634 MA |
1079 | } |
1080 | ||
1081 | void blk_aio_cancel(BlockAIOCB *acb) | |
1082 | { | |
1083 | bdrv_aio_cancel(acb); | |
1084 | } | |
1085 | ||
1086 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1087 | { | |
1088 | bdrv_aio_cancel_async(acb); | |
1089 | } | |
1090 | ||
4be74634 MA |
1091 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
1092 | { | |
c09ba36c HR |
1093 | if (!blk_is_available(blk)) { |
1094 | return -ENOMEDIUM; | |
1095 | } | |
1096 | ||
f21d96d0 | 1097 | return bdrv_ioctl(blk_bs(blk), req, buf); |
4be74634 MA |
1098 | } |
1099 | ||
1100 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1101 | BlockCompletionFunc *cb, void *opaque) | |
1102 | { | |
c09ba36c | 1103 | if (!blk_is_available(blk)) { |
ca78ecfa | 1104 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1105 | } |
1106 | ||
f21d96d0 | 1107 | return bdrv_aio_ioctl(blk_bs(blk), req, buf, cb, opaque); |
4be74634 MA |
1108 | } |
1109 | ||
1c6c4bb7 | 1110 | int blk_co_pdiscard(BlockBackend *blk, int64_t offset, int count) |
2bb0dce7 | 1111 | { |
1c6c4bb7 | 1112 | int ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1113 | if (ret < 0) { |
1114 | return ret; | |
1115 | } | |
1116 | ||
1c6c4bb7 | 1117 | return bdrv_co_pdiscard(blk_bs(blk), offset, count); |
2bb0dce7 HR |
1118 | } |
1119 | ||
1120 | int blk_co_flush(BlockBackend *blk) | |
1121 | { | |
c09ba36c HR |
1122 | if (!blk_is_available(blk)) { |
1123 | return -ENOMEDIUM; | |
1124 | } | |
1125 | ||
f21d96d0 | 1126 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1127 | } |
1128 | ||
4be74634 MA |
1129 | int blk_flush(BlockBackend *blk) |
1130 | { | |
c09ba36c HR |
1131 | if (!blk_is_available(blk)) { |
1132 | return -ENOMEDIUM; | |
1133 | } | |
1134 | ||
f21d96d0 | 1135 | return bdrv_flush(blk_bs(blk)); |
4be74634 MA |
1136 | } |
1137 | ||
97b0385a AY |
1138 | void blk_drain(BlockBackend *blk) |
1139 | { | |
f21d96d0 KW |
1140 | if (blk_bs(blk)) { |
1141 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1142 | } |
97b0385a AY |
1143 | } |
1144 | ||
4be74634 MA |
1145 | void blk_drain_all(void) |
1146 | { | |
1147 | bdrv_drain_all(); | |
1148 | } | |
1149 | ||
373340b2 HR |
1150 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1151 | BlockdevOnError on_write_error) | |
1152 | { | |
1153 | blk->on_read_error = on_read_error; | |
1154 | blk->on_write_error = on_write_error; | |
1155 | } | |
1156 | ||
4be74634 MA |
1157 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1158 | { | |
373340b2 | 1159 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1160 | } |
1161 | ||
1162 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1163 | int error) | |
1164 | { | |
373340b2 HR |
1165 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1166 | ||
1167 | switch (on_err) { | |
1168 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1169 | return (error == ENOSPC) ? | |
1170 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1171 | case BLOCKDEV_ON_ERROR_STOP: | |
1172 | return BLOCK_ERROR_ACTION_STOP; | |
1173 | case BLOCKDEV_ON_ERROR_REPORT: | |
1174 | return BLOCK_ERROR_ACTION_REPORT; | |
1175 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1176 | return BLOCK_ERROR_ACTION_IGNORE; | |
8c398252 | 1177 | case BLOCKDEV_ON_ERROR_AUTO: |
373340b2 HR |
1178 | default: |
1179 | abort(); | |
1180 | } | |
4be74634 MA |
1181 | } |
1182 | ||
373340b2 HR |
1183 | static void send_qmp_error_event(BlockBackend *blk, |
1184 | BlockErrorAction action, | |
1185 | bool is_read, int error) | |
1186 | { | |
1187 | IoOperationType optype; | |
1188 | ||
1189 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
1190 | qapi_event_send_block_io_error(blk_name(blk), optype, action, | |
1191 | blk_iostatus_is_enabled(blk), | |
1192 | error == ENOSPC, strerror(error), | |
1193 | &error_abort); | |
1194 | } | |
1195 | ||
1196 | /* This is done by device models because, while the block layer knows | |
1197 | * about the error, it does not know whether an operation comes from | |
1198 | * the device or the block layer (from a job, for example). | |
1199 | */ | |
4be74634 MA |
1200 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1201 | bool is_read, int error) | |
1202 | { | |
373340b2 HR |
1203 | assert(error >= 0); |
1204 | ||
1205 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1206 | /* First set the iostatus, so that "info block" returns an iostatus | |
1207 | * that matches the events raised so far (an additional error iostatus | |
1208 | * is fine, but not a lost one). | |
1209 | */ | |
1210 | blk_iostatus_set_err(blk, error); | |
1211 | ||
1212 | /* Then raise the request to stop the VM and the event. | |
1213 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1214 | * it ensures that the STOP event always comes after the | |
1215 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1216 | * can observe the STOP event and do a "cont" before the STOP | |
1217 | * event is issued, the VM will not stop. In this case, vm_start() | |
1218 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1219 | */ | |
1220 | qemu_system_vmstop_request_prepare(); | |
1221 | send_qmp_error_event(blk, action, is_read, error); | |
1222 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1223 | } else { | |
1224 | send_qmp_error_event(blk, action, is_read, error); | |
1225 | } | |
4be74634 MA |
1226 | } |
1227 | ||
1228 | int blk_is_read_only(BlockBackend *blk) | |
1229 | { | |
f21d96d0 KW |
1230 | BlockDriverState *bs = blk_bs(blk); |
1231 | ||
1232 | if (bs) { | |
1233 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1234 | } else { |
1235 | return blk->root_state.read_only; | |
1236 | } | |
4be74634 MA |
1237 | } |
1238 | ||
1239 | int blk_is_sg(BlockBackend *blk) | |
1240 | { | |
f21d96d0 KW |
1241 | BlockDriverState *bs = blk_bs(blk); |
1242 | ||
1243 | if (!bs) { | |
a46fc9c9 HR |
1244 | return 0; |
1245 | } | |
1246 | ||
f21d96d0 | 1247 | return bdrv_is_sg(bs); |
4be74634 MA |
1248 | } |
1249 | ||
1250 | int blk_enable_write_cache(BlockBackend *blk) | |
1251 | { | |
bfd18d1e | 1252 | return blk->enable_write_cache; |
4be74634 MA |
1253 | } |
1254 | ||
1255 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1256 | { | |
bfd18d1e | 1257 | blk->enable_write_cache = wce; |
4be74634 MA |
1258 | } |
1259 | ||
2bb0dce7 HR |
1260 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1261 | { | |
f21d96d0 KW |
1262 | BlockDriverState *bs = blk_bs(blk); |
1263 | ||
1264 | if (!bs) { | |
c09ba36c HR |
1265 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1266 | return; | |
1267 | } | |
1268 | ||
f21d96d0 | 1269 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1270 | } |
1271 | ||
e031f750 | 1272 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1273 | { |
f21d96d0 KW |
1274 | BlockDriverState *bs = blk_bs(blk); |
1275 | ||
1276 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1277 | } |
1278 | ||
1279 | bool blk_is_available(BlockBackend *blk) | |
1280 | { | |
1281 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1282 | } |
1283 | ||
1284 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1285 | { | |
f21d96d0 KW |
1286 | BlockDriverState *bs = blk_bs(blk); |
1287 | ||
1288 | if (bs) { | |
1289 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1290 | } |
4be74634 MA |
1291 | } |
1292 | ||
1293 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1294 | { | |
f21d96d0 KW |
1295 | BlockDriverState *bs = blk_bs(blk); |
1296 | ||
1297 | if (bs) { | |
1298 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1299 | } |
4be74634 MA |
1300 | } |
1301 | ||
1302 | int blk_get_flags(BlockBackend *blk) | |
1303 | { | |
f21d96d0 KW |
1304 | BlockDriverState *bs = blk_bs(blk); |
1305 | ||
1306 | if (bs) { | |
1307 | return bdrv_get_flags(bs); | |
061959e8 HR |
1308 | } else { |
1309 | return blk->root_state.open_flags; | |
1310 | } | |
4be74634 MA |
1311 | } |
1312 | ||
5def6b80 EB |
1313 | /* Returns the maximum transfer length, in bytes; guaranteed nonzero */ |
1314 | uint32_t blk_get_max_transfer(BlockBackend *blk) | |
454057b7 | 1315 | { |
f21d96d0 | 1316 | BlockDriverState *bs = blk_bs(blk); |
5def6b80 | 1317 | uint32_t max = 0; |
f21d96d0 KW |
1318 | |
1319 | if (bs) { | |
5def6b80 | 1320 | max = bs->bl.max_transfer; |
a46fc9c9 | 1321 | } |
5def6b80 | 1322 | return MIN_NON_ZERO(max, INT_MAX); |
454057b7 PL |
1323 | } |
1324 | ||
648296e0 SH |
1325 | int blk_get_max_iov(BlockBackend *blk) |
1326 | { | |
f21d96d0 | 1327 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1328 | } |
1329 | ||
4be74634 MA |
1330 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1331 | { | |
68e9ec01 | 1332 | blk->guest_block_size = align; |
4be74634 MA |
1333 | } |
1334 | ||
f1c17521 PB |
1335 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1336 | { | |
f21d96d0 | 1337 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1338 | } |
1339 | ||
4be74634 MA |
1340 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1341 | { | |
f21d96d0 | 1342 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1343 | } |
1344 | ||
1345 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1346 | { | |
f21d96d0 KW |
1347 | BlockDriverState *bs = blk_bs(blk); |
1348 | ||
1349 | if (!bs) { | |
a46fc9c9 HR |
1350 | return false; |
1351 | } | |
1352 | ||
f21d96d0 | 1353 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1354 | } |
1355 | ||
1356 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1357 | { | |
f21d96d0 KW |
1358 | BlockDriverState *bs = blk_bs(blk); |
1359 | ||
1360 | if (bs) { | |
1361 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1362 | } |
4be74634 MA |
1363 | } |
1364 | ||
1365 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1366 | { | |
f21d96d0 KW |
1367 | BlockDriverState *bs = blk_bs(blk); |
1368 | ||
1369 | if (bs) { | |
1370 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1371 | } |
4be74634 MA |
1372 | } |
1373 | ||
1374 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1375 | { | |
f21d96d0 KW |
1376 | BlockDriverState *bs = blk_bs(blk); |
1377 | ||
1378 | if (bs) { | |
1379 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1380 | } |
4be74634 MA |
1381 | } |
1382 | ||
1383 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1384 | { | |
f21d96d0 KW |
1385 | BlockDriverState *bs = blk_bs(blk); |
1386 | ||
1387 | if (bs) { | |
1388 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1389 | } else { |
1390 | return qemu_get_aio_context(); | |
1391 | } | |
1392 | } | |
1393 | ||
1394 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1395 | { | |
1396 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1397 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1398 | } |
1399 | ||
1400 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1401 | { | |
f21d96d0 KW |
1402 | BlockDriverState *bs = blk_bs(blk); |
1403 | ||
1404 | if (bs) { | |
7ca7f0f6 KW |
1405 | if (blk->public.throttle_state) { |
1406 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); | |
1407 | } | |
f21d96d0 | 1408 | bdrv_set_aio_context(bs, new_context); |
7ca7f0f6 KW |
1409 | if (blk->public.throttle_state) { |
1410 | throttle_timers_attach_aio_context(&blk->public.throttle_timers, | |
1411 | new_context); | |
1412 | } | |
a46fc9c9 | 1413 | } |
4be74634 MA |
1414 | } |
1415 | ||
2019ba0a HR |
1416 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1417 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1418 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1419 | { | |
f21d96d0 KW |
1420 | BlockDriverState *bs = blk_bs(blk); |
1421 | ||
1422 | if (bs) { | |
1423 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1424 | detach_aio_context, opaque); |
1425 | } | |
2019ba0a HR |
1426 | } |
1427 | ||
1428 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1429 | void (*attached_aio_context)(AioContext *, | |
1430 | void *), | |
1431 | void (*detach_aio_context)(void *), | |
1432 | void *opaque) | |
1433 | { | |
f21d96d0 KW |
1434 | BlockDriverState *bs = blk_bs(blk); |
1435 | ||
1436 | if (bs) { | |
1437 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1438 | detach_aio_context, opaque); |
1439 | } | |
2019ba0a HR |
1440 | } |
1441 | ||
3301f6c6 HR |
1442 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1443 | { | |
1444 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1445 | } | |
1446 | ||
1447 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1448 | { | |
1449 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1450 | } | |
1451 | ||
4be74634 MA |
1452 | void blk_io_plug(BlockBackend *blk) |
1453 | { | |
f21d96d0 KW |
1454 | BlockDriverState *bs = blk_bs(blk); |
1455 | ||
1456 | if (bs) { | |
1457 | bdrv_io_plug(bs); | |
a46fc9c9 | 1458 | } |
4be74634 MA |
1459 | } |
1460 | ||
1461 | void blk_io_unplug(BlockBackend *blk) | |
1462 | { | |
f21d96d0 KW |
1463 | BlockDriverState *bs = blk_bs(blk); |
1464 | ||
1465 | if (bs) { | |
1466 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1467 | } |
4be74634 MA |
1468 | } |
1469 | ||
1470 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1471 | { | |
7f0e9da6 | 1472 | return &blk->stats; |
4be74634 MA |
1473 | } |
1474 | ||
1475 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1476 | BlockCompletionFunc *cb, void *opaque) | |
1477 | { | |
1478 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1479 | } | |
1ef01253 | 1480 | |
d004bd52 EB |
1481 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1482 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1483 | { |
983a1600 | 1484 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1485 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1486 | } |
1487 | ||
fe5c1355 PB |
1488 | int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf, |
1489 | int count) | |
1ef01253 | 1490 | { |
35fadca8 PB |
1491 | return blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1492 | BDRV_REQ_WRITE_COMPRESSED); | |
1ef01253 HR |
1493 | } |
1494 | ||
1495 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1496 | { | |
c09ba36c HR |
1497 | if (!blk_is_available(blk)) { |
1498 | return -ENOMEDIUM; | |
1499 | } | |
1500 | ||
f21d96d0 | 1501 | return bdrv_truncate(blk_bs(blk), offset); |
1ef01253 HR |
1502 | } |
1503 | ||
1c6c4bb7 | 1504 | int blk_pdiscard(BlockBackend *blk, int64_t offset, int count) |
1ef01253 | 1505 | { |
1c6c4bb7 | 1506 | int ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
1507 | if (ret < 0) { |
1508 | return ret; | |
1509 | } | |
1510 | ||
1c6c4bb7 | 1511 | return bdrv_pdiscard(blk_bs(blk), offset, count); |
1ef01253 HR |
1512 | } |
1513 | ||
1514 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1515 | int64_t pos, int size) | |
1516 | { | |
bfd18d1e KW |
1517 | int ret; |
1518 | ||
c09ba36c HR |
1519 | if (!blk_is_available(blk)) { |
1520 | return -ENOMEDIUM; | |
1521 | } | |
1522 | ||
bfd18d1e KW |
1523 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1524 | if (ret < 0) { | |
1525 | return ret; | |
1526 | } | |
1527 | ||
1528 | if (ret == size && !blk->enable_write_cache) { | |
1529 | ret = bdrv_flush(blk_bs(blk)); | |
1530 | } | |
1531 | ||
1532 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1533 | } |
1534 | ||
1535 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1536 | { | |
c09ba36c HR |
1537 | if (!blk_is_available(blk)) { |
1538 | return -ENOMEDIUM; | |
1539 | } | |
1540 | ||
f21d96d0 | 1541 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1542 | } |
f0272c4d ET |
1543 | |
1544 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1545 | { | |
c09ba36c HR |
1546 | if (!blk_is_available(blk)) { |
1547 | return -ENOMEDIUM; | |
1548 | } | |
1549 | ||
f21d96d0 | 1550 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1551 | } |
1552 | ||
1553 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1554 | { | |
c09ba36c HR |
1555 | if (!blk_is_available(blk)) { |
1556 | return -ENOMEDIUM; | |
1557 | } | |
1558 | ||
f21d96d0 | 1559 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1560 | } |
281d22d8 HR |
1561 | |
1562 | /* | |
1563 | * Updates the BlockBackendRootState object with data from the currently | |
1564 | * attached BlockDriverState. | |
1565 | */ | |
1566 | void blk_update_root_state(BlockBackend *blk) | |
1567 | { | |
f21d96d0 | 1568 | assert(blk->root); |
281d22d8 | 1569 | |
f21d96d0 KW |
1570 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1571 | blk->root_state.read_only = blk->root->bs->read_only; | |
1572 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1573 | } |
1574 | ||
38cb18f5 HR |
1575 | /* |
1576 | * Applies the information in the root state to the given BlockDriverState. This | |
1577 | * does not include the flags which have to be specified for bdrv_open(), use | |
1578 | * blk_get_open_flags_from_root_state() to inquire them. | |
1579 | */ | |
1580 | void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs) | |
1581 | { | |
1582 | bs->detect_zeroes = blk->root_state.detect_zeroes; | |
38cb18f5 HR |
1583 | } |
1584 | ||
1585 | /* | |
1586 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1587 | * supposed to inherit the root state. | |
1588 | */ | |
1589 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1590 | { | |
1591 | int bs_flags; | |
1592 | ||
1593 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1594 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1595 | ||
1596 | return bs_flags; | |
1597 | } | |
1598 | ||
281d22d8 HR |
1599 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1600 | { | |
1601 | return &blk->root_state; | |
1602 | } | |
1393f212 HR |
1603 | |
1604 | int blk_commit_all(void) | |
1605 | { | |
fe1a9cbc HR |
1606 | BlockBackend *blk = NULL; |
1607 | ||
1608 | while ((blk = blk_all_next(blk)) != NULL) { | |
1609 | AioContext *aio_context = blk_get_aio_context(blk); | |
1610 | ||
1611 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1612 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1613 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1614 | if (ret < 0) { |
1615 | aio_context_release(aio_context); | |
1616 | return ret; | |
1617 | } | |
1618 | } | |
1619 | aio_context_release(aio_context); | |
1620 | } | |
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | int blk_flush_all(void) | |
1625 | { | |
1626 | BlockBackend *blk = NULL; | |
1627 | int result = 0; | |
1628 | ||
1629 | while ((blk = blk_all_next(blk)) != NULL) { | |
1630 | AioContext *aio_context = blk_get_aio_context(blk); | |
1631 | int ret; | |
1632 | ||
1633 | aio_context_acquire(aio_context); | |
1634 | if (blk_is_inserted(blk)) { | |
1635 | ret = blk_flush(blk); | |
1636 | if (ret < 0 && !result) { | |
1637 | result = ret; | |
1638 | } | |
1639 | } | |
1640 | aio_context_release(aio_context); | |
1641 | } | |
1642 | ||
1643 | return result; | |
1393f212 | 1644 | } |
97148076 KW |
1645 | |
1646 | ||
1647 | /* throttling disk I/O limits */ | |
1648 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
1649 | { | |
1650 | throttle_group_config(blk, cfg); | |
1651 | } | |
1652 | ||
1653 | void blk_io_limits_disable(BlockBackend *blk) | |
1654 | { | |
1655 | assert(blk->public.throttle_state); | |
c2066af0 | 1656 | bdrv_drained_begin(blk_bs(blk)); |
97148076 | 1657 | throttle_group_unregister_blk(blk); |
c2066af0 | 1658 | bdrv_drained_end(blk_bs(blk)); |
97148076 KW |
1659 | } |
1660 | ||
1661 | /* should be called before blk_set_io_limits if a limit is set */ | |
1662 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
1663 | { | |
1664 | assert(!blk->public.throttle_state); | |
1665 | throttle_group_register_blk(blk, group); | |
1666 | } | |
1667 | ||
1668 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
1669 | { | |
1670 | /* this BB is not part of any group */ | |
1671 | if (!blk->public.throttle_state) { | |
1672 | return; | |
1673 | } | |
1674 | ||
1675 | /* this BB is a part of the same group than the one we want */ | |
1676 | if (!g_strcmp0(throttle_group_get_name(blk), group)) { | |
1677 | return; | |
1678 | } | |
1679 | ||
1680 | /* need to change the group this bs belong to */ | |
1681 | blk_io_limits_disable(blk); | |
1682 | blk_io_limits_enable(blk, group); | |
1683 | } | |
c2066af0 KW |
1684 | |
1685 | static void blk_root_drained_begin(BdrvChild *child) | |
1686 | { | |
1687 | BlockBackend *blk = child->opaque; | |
1688 | ||
36fe1331 KW |
1689 | /* Note that blk->root may not be accessible here yet if we are just |
1690 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
1691 | ||
c2066af0 KW |
1692 | if (blk->public.io_limits_disabled++ == 0) { |
1693 | throttle_group_restart_blk(blk); | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | static void blk_root_drained_end(BdrvChild *child) | |
1698 | { | |
1699 | BlockBackend *blk = child->opaque; | |
1700 | ||
1701 | assert(blk->public.io_limits_disabled); | |
1702 | --blk->public.io_limits_disabled; | |
1703 | } |