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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 | ||
18e46a03 MA |
412 | /* |
413 | * Return @blk's DriveInfo if any, else null. | |
414 | */ | |
415 | DriveInfo *blk_legacy_dinfo(BlockBackend *blk) | |
416 | { | |
417 | return blk->legacy_dinfo; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Set @blk's DriveInfo to @dinfo, and return it. | |
422 | * @blk must not have a DriveInfo set already. | |
423 | * No other BlockBackend may have the same DriveInfo set. | |
424 | */ | |
425 | DriveInfo *blk_set_legacy_dinfo(BlockBackend *blk, DriveInfo *dinfo) | |
426 | { | |
427 | assert(!blk->legacy_dinfo); | |
428 | return blk->legacy_dinfo = dinfo; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Return the BlockBackend with DriveInfo @dinfo. | |
433 | * It must exist. | |
434 | */ | |
435 | BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo) | |
436 | { | |
74d1b8fc | 437 | BlockBackend *blk = NULL; |
18e46a03 | 438 | |
74d1b8fc | 439 | while ((blk = blk_next(blk)) != NULL) { |
18e46a03 MA |
440 | if (blk->legacy_dinfo == dinfo) { |
441 | return blk; | |
442 | } | |
443 | } | |
444 | abort(); | |
445 | } | |
446 | ||
f2cd875d KW |
447 | /* |
448 | * Returns a pointer to the publicly accessible fields of @blk. | |
449 | */ | |
450 | BlockBackendPublic *blk_get_public(BlockBackend *blk) | |
451 | { | |
452 | return &blk->public; | |
453 | } | |
454 | ||
455 | /* | |
456 | * Returns a BlockBackend given the associated @public fields. | |
457 | */ | |
458 | BlockBackend *blk_by_public(BlockBackendPublic *public) | |
459 | { | |
460 | return container_of(public, BlockBackend, public); | |
461 | } | |
462 | ||
1c95f7e1 HR |
463 | /* |
464 | * Disassociates the currently associated BlockDriverState from @blk. | |
465 | */ | |
466 | void blk_remove_bs(BlockBackend *blk) | |
467 | { | |
3301f6c6 | 468 | notifier_list_notify(&blk->remove_bs_notifiers, blk); |
27ccdd52 | 469 | if (blk->public.throttle_state) { |
7ca7f0f6 | 470 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); |
a5614993 | 471 | } |
1c95f7e1 | 472 | |
7ca7f0f6 KW |
473 | blk_update_root_state(blk); |
474 | ||
f21d96d0 KW |
475 | bdrv_root_unref_child(blk->root); |
476 | blk->root = NULL; | |
1c95f7e1 HR |
477 | } |
478 | ||
0c3c36d6 HR |
479 | /* |
480 | * Associates a new BlockDriverState with @blk. | |
481 | */ | |
482 | void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) | |
483 | { | |
0c3c36d6 | 484 | bdrv_ref(bs); |
36fe1331 | 485 | blk->root = bdrv_root_attach_child(bs, "root", &child_root, blk); |
3301f6c6 HR |
486 | |
487 | notifier_list_notify(&blk->insert_bs_notifiers, blk); | |
7ca7f0f6 KW |
488 | if (blk->public.throttle_state) { |
489 | throttle_timers_attach_aio_context( | |
490 | &blk->public.throttle_timers, bdrv_get_aio_context(bs)); | |
491 | } | |
0c3c36d6 HR |
492 | } |
493 | ||
a7f53e26 MA |
494 | /* |
495 | * Attach device model @dev to @blk. | |
496 | * Return 0 on success, -EBUSY when a device model is attached already. | |
497 | */ | |
4be74634 | 498 | int blk_attach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 499 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 500 | { |
a7f53e26 MA |
501 | if (blk->dev) { |
502 | return -EBUSY; | |
503 | } | |
84ebe375 | 504 | blk_ref(blk); |
a7f53e26 | 505 | blk->dev = dev; |
373340b2 | 506 | blk_iostatus_reset(blk); |
a7f53e26 | 507 | return 0; |
4be74634 MA |
508 | } |
509 | ||
a7f53e26 MA |
510 | /* |
511 | * Attach device model @dev to @blk. | |
512 | * @blk must not have a device model attached already. | |
513 | * TODO qdevified devices don't use this, remove when devices are qdevified | |
514 | */ | |
4be74634 MA |
515 | void blk_attach_dev_nofail(BlockBackend *blk, void *dev) |
516 | { | |
a7f53e26 MA |
517 | if (blk_attach_dev(blk, dev) < 0) { |
518 | abort(); | |
519 | } | |
4be74634 MA |
520 | } |
521 | ||
a7f53e26 MA |
522 | /* |
523 | * Detach device model @dev from @blk. | |
524 | * @dev must be currently attached to @blk. | |
525 | */ | |
4be74634 | 526 | void blk_detach_dev(BlockBackend *blk, void *dev) |
a7f53e26 | 527 | /* TODO change to DeviceState *dev when all users are qdevified */ |
4be74634 | 528 | { |
a7f53e26 MA |
529 | assert(blk->dev == dev); |
530 | blk->dev = NULL; | |
531 | blk->dev_ops = NULL; | |
532 | blk->dev_opaque = NULL; | |
68e9ec01 | 533 | blk->guest_block_size = 512; |
84ebe375 | 534 | blk_unref(blk); |
4be74634 MA |
535 | } |
536 | ||
a7f53e26 MA |
537 | /* |
538 | * Return the device model attached to @blk if any, else null. | |
539 | */ | |
4be74634 | 540 | void *blk_get_attached_dev(BlockBackend *blk) |
a7f53e26 MA |
541 | /* TODO change to return DeviceState * when all users are qdevified */ |
542 | { | |
543 | return blk->dev; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Set @blk's device model callbacks to @ops. | |
548 | * @opaque is the opaque argument to pass to the callbacks. | |
549 | * This is for use by device models. | |
550 | */ | |
551 | void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, | |
552 | void *opaque) | |
553 | { | |
554 | blk->dev_ops = ops; | |
555 | blk->dev_opaque = opaque; | |
556 | } | |
557 | ||
558 | /* | |
559 | * Notify @blk's attached device model of media change. | |
560 | * If @load is true, notify of media load. | |
561 | * Else, notify of media eject. | |
562 | * Also send DEVICE_TRAY_MOVED events as appropriate. | |
563 | */ | |
564 | void blk_dev_change_media_cb(BlockBackend *blk, bool load) | |
565 | { | |
566 | if (blk->dev_ops && blk->dev_ops->change_media_cb) { | |
f1f57066 | 567 | bool tray_was_open, tray_is_open; |
a7f53e26 | 568 | |
f1f57066 | 569 | tray_was_open = blk_dev_is_tray_open(blk); |
a7f53e26 | 570 | blk->dev_ops->change_media_cb(blk->dev_opaque, load); |
f1f57066 HR |
571 | tray_is_open = blk_dev_is_tray_open(blk); |
572 | ||
573 | if (tray_was_open != tray_is_open) { | |
574 | qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open, | |
575 | &error_abort); | |
a7f53e26 MA |
576 | } |
577 | } | |
578 | } | |
579 | ||
5c8cab48 KW |
580 | static void blk_root_change_media(BdrvChild *child, bool load) |
581 | { | |
582 | blk_dev_change_media_cb(child->opaque, load); | |
583 | } | |
584 | ||
a7f53e26 MA |
585 | /* |
586 | * Does @blk's attached device model have removable media? | |
587 | * %true if no device model is attached. | |
588 | */ | |
589 | bool blk_dev_has_removable_media(BlockBackend *blk) | |
590 | { | |
591 | return !blk->dev || (blk->dev_ops && blk->dev_ops->change_media_cb); | |
592 | } | |
593 | ||
8f3a73bc HR |
594 | /* |
595 | * Does @blk's attached device model have a tray? | |
596 | */ | |
597 | bool blk_dev_has_tray(BlockBackend *blk) | |
598 | { | |
599 | return blk->dev_ops && blk->dev_ops->is_tray_open; | |
600 | } | |
601 | ||
a7f53e26 MA |
602 | /* |
603 | * Notify @blk's attached device model of a media eject request. | |
604 | * If @force is true, the medium is about to be yanked out forcefully. | |
605 | */ | |
606 | void blk_dev_eject_request(BlockBackend *blk, bool force) | |
4be74634 | 607 | { |
a7f53e26 MA |
608 | if (blk->dev_ops && blk->dev_ops->eject_request_cb) { |
609 | blk->dev_ops->eject_request_cb(blk->dev_opaque, force); | |
610 | } | |
4be74634 MA |
611 | } |
612 | ||
a7f53e26 MA |
613 | /* |
614 | * Does @blk's attached device model have a tray, and is it open? | |
615 | */ | |
616 | bool blk_dev_is_tray_open(BlockBackend *blk) | |
4be74634 | 617 | { |
8f3a73bc | 618 | if (blk_dev_has_tray(blk)) { |
a7f53e26 MA |
619 | return blk->dev_ops->is_tray_open(blk->dev_opaque); |
620 | } | |
621 | return false; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Does @blk's attached device model have the medium locked? | |
626 | * %false if the device model has no such lock. | |
627 | */ | |
628 | bool blk_dev_is_medium_locked(BlockBackend *blk) | |
629 | { | |
630 | if (blk->dev_ops && blk->dev_ops->is_medium_locked) { | |
631 | return blk->dev_ops->is_medium_locked(blk->dev_opaque); | |
632 | } | |
633 | return false; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Notify @blk's attached device model of a backend size change. | |
638 | */ | |
5c8cab48 | 639 | static void blk_root_resize(BdrvChild *child) |
a7f53e26 | 640 | { |
5c8cab48 KW |
641 | BlockBackend *blk = child->opaque; |
642 | ||
a7f53e26 MA |
643 | if (blk->dev_ops && blk->dev_ops->resize_cb) { |
644 | blk->dev_ops->resize_cb(blk->dev_opaque); | |
645 | } | |
646 | } | |
647 | ||
648 | void blk_iostatus_enable(BlockBackend *blk) | |
649 | { | |
373340b2 HR |
650 | blk->iostatus_enabled = true; |
651 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; | |
652 | } | |
653 | ||
654 | /* The I/O status is only enabled if the drive explicitly | |
655 | * enables it _and_ the VM is configured to stop on errors */ | |
656 | bool blk_iostatus_is_enabled(const BlockBackend *blk) | |
657 | { | |
658 | return (blk->iostatus_enabled && | |
659 | (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || | |
660 | blk->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
661 | blk->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
662 | } | |
663 | ||
664 | BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk) | |
665 | { | |
666 | return blk->iostatus; | |
667 | } | |
668 | ||
669 | void blk_iostatus_disable(BlockBackend *blk) | |
670 | { | |
671 | blk->iostatus_enabled = false; | |
672 | } | |
673 | ||
674 | void blk_iostatus_reset(BlockBackend *blk) | |
675 | { | |
676 | if (blk_iostatus_is_enabled(blk)) { | |
f21d96d0 | 677 | BlockDriverState *bs = blk_bs(blk); |
373340b2 | 678 | blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
f21d96d0 KW |
679 | if (bs && bs->job) { |
680 | block_job_iostatus_reset(bs->job); | |
373340b2 HR |
681 | } |
682 | } | |
683 | } | |
684 | ||
685 | void blk_iostatus_set_err(BlockBackend *blk, int error) | |
686 | { | |
687 | assert(blk_iostatus_is_enabled(blk)); | |
688 | if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
689 | blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : | |
690 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
691 | } | |
4be74634 MA |
692 | } |
693 | ||
c10c9d96 KW |
694 | void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) |
695 | { | |
696 | blk->allow_write_beyond_eof = allow; | |
697 | } | |
698 | ||
e7f7d676 HR |
699 | static int blk_check_byte_request(BlockBackend *blk, int64_t offset, |
700 | size_t size) | |
701 | { | |
702 | int64_t len; | |
703 | ||
704 | if (size > INT_MAX) { | |
705 | return -EIO; | |
706 | } | |
707 | ||
c09ba36c | 708 | if (!blk_is_available(blk)) { |
e7f7d676 HR |
709 | return -ENOMEDIUM; |
710 | } | |
711 | ||
e7f7d676 HR |
712 | if (offset < 0) { |
713 | return -EIO; | |
714 | } | |
715 | ||
c10c9d96 KW |
716 | if (!blk->allow_write_beyond_eof) { |
717 | len = blk_getlength(blk); | |
718 | if (len < 0) { | |
719 | return len; | |
720 | } | |
721 | ||
722 | if (offset > len || len - offset < size) { | |
723 | return -EIO; | |
724 | } | |
e7f7d676 HR |
725 | } |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | static int blk_check_request(BlockBackend *blk, int64_t sector_num, | |
731 | int nb_sectors) | |
732 | { | |
733 | if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) { | |
734 | return -EIO; | |
735 | } | |
736 | ||
737 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { | |
738 | return -EIO; | |
739 | } | |
740 | ||
741 | return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE, | |
742 | nb_sectors * BDRV_SECTOR_SIZE); | |
743 | } | |
744 | ||
1e98fefd KW |
745 | int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, |
746 | unsigned int bytes, QEMUIOVector *qiov, | |
747 | BdrvRequestFlags flags) | |
4be74634 | 748 | { |
1e98fefd KW |
749 | int ret; |
750 | ||
751 | trace_blk_co_preadv(blk, blk_bs(blk), offset, bytes, flags); | |
752 | ||
753 | ret = blk_check_byte_request(blk, offset, bytes); | |
e7f7d676 HR |
754 | if (ret < 0) { |
755 | return ret; | |
756 | } | |
757 | ||
441565b2 KW |
758 | /* throttling disk I/O */ |
759 | if (blk->public.throttle_state) { | |
760 | throttle_group_co_io_limits_intercept(blk, bytes, false); | |
761 | } | |
762 | ||
cab3a356 | 763 | return bdrv_co_preadv(blk_bs(blk), offset, bytes, qiov, flags); |
1bf1cbc9 KW |
764 | } |
765 | ||
1e98fefd KW |
766 | int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, |
767 | unsigned int bytes, QEMUIOVector *qiov, | |
768 | BdrvRequestFlags flags) | |
a8823a3b | 769 | { |
bfd18d1e KW |
770 | int ret; |
771 | ||
1e98fefd KW |
772 | trace_blk_co_pwritev(blk, blk_bs(blk), offset, bytes, flags); |
773 | ||
bfd18d1e | 774 | ret = blk_check_byte_request(blk, offset, bytes); |
a8823a3b KW |
775 | if (ret < 0) { |
776 | return ret; | |
777 | } | |
778 | ||
441565b2 KW |
779 | /* throttling disk I/O */ |
780 | if (blk->public.throttle_state) { | |
781 | throttle_group_co_io_limits_intercept(blk, bytes, true); | |
782 | } | |
783 | ||
bfd18d1e KW |
784 | if (!blk->enable_write_cache) { |
785 | flags |= BDRV_REQ_FUA; | |
786 | } | |
787 | ||
cab3a356 | 788 | return bdrv_co_pwritev(blk_bs(blk), offset, bytes, qiov, flags); |
a8823a3b KW |
789 | } |
790 | ||
1bf1cbc9 KW |
791 | typedef struct BlkRwCo { |
792 | BlockBackend *blk; | |
793 | int64_t offset; | |
794 | QEMUIOVector *qiov; | |
795 | int ret; | |
796 | BdrvRequestFlags flags; | |
797 | } BlkRwCo; | |
798 | ||
799 | static void blk_read_entry(void *opaque) | |
800 | { | |
801 | BlkRwCo *rwco = opaque; | |
802 | ||
803 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, rwco->qiov->size, | |
804 | rwco->qiov, rwco->flags); | |
805 | } | |
806 | ||
a8823a3b KW |
807 | static void blk_write_entry(void *opaque) |
808 | { | |
809 | BlkRwCo *rwco = opaque; | |
810 | ||
811 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, rwco->qiov->size, | |
812 | rwco->qiov, rwco->flags); | |
813 | } | |
814 | ||
a55d3fba KW |
815 | static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, |
816 | int64_t bytes, CoroutineEntry co_entry, | |
817 | BdrvRequestFlags flags) | |
1bf1cbc9 KW |
818 | { |
819 | AioContext *aio_context; | |
820 | QEMUIOVector qiov; | |
821 | struct iovec iov; | |
822 | Coroutine *co; | |
823 | BlkRwCo rwco; | |
824 | ||
1bf1cbc9 KW |
825 | iov = (struct iovec) { |
826 | .iov_base = buf, | |
a55d3fba | 827 | .iov_len = bytes, |
1bf1cbc9 KW |
828 | }; |
829 | qemu_iovec_init_external(&qiov, &iov, 1); | |
830 | ||
831 | rwco = (BlkRwCo) { | |
832 | .blk = blk, | |
a55d3fba | 833 | .offset = offset, |
1bf1cbc9 | 834 | .qiov = &qiov, |
fc1453cd | 835 | .flags = flags, |
1bf1cbc9 KW |
836 | .ret = NOT_DONE, |
837 | }; | |
838 | ||
a8823a3b | 839 | co = qemu_coroutine_create(co_entry); |
1bf1cbc9 KW |
840 | qemu_coroutine_enter(co, &rwco); |
841 | ||
842 | aio_context = blk_get_aio_context(blk); | |
843 | while (rwco.ret == NOT_DONE) { | |
844 | aio_poll(aio_context, true); | |
845 | } | |
846 | ||
847 | return rwco.ret; | |
4be74634 MA |
848 | } |
849 | ||
b7d17f9f EB |
850 | int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, |
851 | int count) | |
4be74634 | 852 | { |
5bd51196 KW |
853 | int ret; |
854 | ||
b7d17f9f | 855 | ret = blk_check_byte_request(blk, offset, count); |
e7f7d676 HR |
856 | if (ret < 0) { |
857 | return ret; | |
858 | } | |
859 | ||
c2066af0 | 860 | blk_root_drained_begin(blk->root); |
b7d17f9f | 861 | ret = blk_pread(blk, offset, buf, count); |
c2066af0 | 862 | blk_root_drained_end(blk->root); |
5bd51196 | 863 | return ret; |
4be74634 MA |
864 | } |
865 | ||
d004bd52 EB |
866 | int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
867 | int count, BdrvRequestFlags flags) | |
0df89e8e | 868 | { |
983a1600 EB |
869 | return blk_prw(blk, offset, NULL, count, blk_write_entry, |
870 | flags | BDRV_REQ_ZERO_WRITE); | |
0df89e8e KW |
871 | } |
872 | ||
e7f7d676 HR |
873 | static void error_callback_bh(void *opaque) |
874 | { | |
875 | struct BlockBackendAIOCB *acb = opaque; | |
876 | qemu_bh_delete(acb->bh); | |
877 | acb->common.cb(acb->common.opaque, acb->ret); | |
878 | qemu_aio_unref(acb); | |
879 | } | |
880 | ||
ca78ecfa PL |
881 | BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, |
882 | BlockCompletionFunc *cb, | |
883 | void *opaque, int ret) | |
e7f7d676 HR |
884 | { |
885 | struct BlockBackendAIOCB *acb; | |
886 | QEMUBH *bh; | |
887 | ||
888 | acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque); | |
4981bdec | 889 | acb->blk = blk; |
e7f7d676 HR |
890 | acb->ret = ret; |
891 | ||
892 | bh = aio_bh_new(blk_get_aio_context(blk), error_callback_bh, acb); | |
893 | acb->bh = bh; | |
894 | qemu_bh_schedule(bh); | |
895 | ||
896 | return &acb->common; | |
897 | } | |
898 | ||
57d6a428 KW |
899 | typedef struct BlkAioEmAIOCB { |
900 | BlockAIOCB common; | |
901 | BlkRwCo rwco; | |
7fa84cd8 | 902 | int bytes; |
57d6a428 KW |
903 | bool has_returned; |
904 | QEMUBH* bh; | |
905 | } BlkAioEmAIOCB; | |
906 | ||
907 | static const AIOCBInfo blk_aio_em_aiocb_info = { | |
908 | .aiocb_size = sizeof(BlkAioEmAIOCB), | |
909 | }; | |
910 | ||
911 | static void blk_aio_complete(BlkAioEmAIOCB *acb) | |
912 | { | |
913 | if (acb->bh) { | |
914 | assert(acb->has_returned); | |
915 | qemu_bh_delete(acb->bh); | |
916 | } | |
917 | if (acb->has_returned) { | |
918 | acb->common.cb(acb->common.opaque, acb->rwco.ret); | |
919 | qemu_aio_unref(acb); | |
920 | } | |
921 | } | |
922 | ||
923 | static void blk_aio_complete_bh(void *opaque) | |
924 | { | |
925 | blk_aio_complete(opaque); | |
926 | } | |
927 | ||
7fa84cd8 | 928 | static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes, |
57d6a428 KW |
929 | QEMUIOVector *qiov, CoroutineEntry co_entry, |
930 | BdrvRequestFlags flags, | |
931 | BlockCompletionFunc *cb, void *opaque) | |
932 | { | |
933 | BlkAioEmAIOCB *acb; | |
934 | Coroutine *co; | |
935 | ||
936 | acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque); | |
937 | acb->rwco = (BlkRwCo) { | |
938 | .blk = blk, | |
939 | .offset = offset, | |
940 | .qiov = qiov, | |
941 | .flags = flags, | |
942 | .ret = NOT_DONE, | |
943 | }; | |
7fa84cd8 | 944 | acb->bytes = bytes; |
57d6a428 KW |
945 | acb->bh = NULL; |
946 | acb->has_returned = false; | |
947 | ||
948 | co = qemu_coroutine_create(co_entry); | |
949 | qemu_coroutine_enter(co, acb); | |
950 | ||
951 | acb->has_returned = true; | |
952 | if (acb->rwco.ret != NOT_DONE) { | |
953 | acb->bh = aio_bh_new(blk_get_aio_context(blk), blk_aio_complete_bh, acb); | |
954 | qemu_bh_schedule(acb->bh); | |
955 | } | |
956 | ||
957 | return &acb->common; | |
958 | } | |
959 | ||
960 | static void blk_aio_read_entry(void *opaque) | |
961 | { | |
962 | BlkAioEmAIOCB *acb = opaque; | |
963 | BlkRwCo *rwco = &acb->rwco; | |
964 | ||
7fa84cd8 KW |
965 | assert(rwco->qiov->size == acb->bytes); |
966 | rwco->ret = blk_co_preadv(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
967 | rwco->qiov, rwco->flags); |
968 | blk_aio_complete(acb); | |
969 | } | |
970 | ||
971 | static void blk_aio_write_entry(void *opaque) | |
972 | { | |
973 | BlkAioEmAIOCB *acb = opaque; | |
974 | BlkRwCo *rwco = &acb->rwco; | |
975 | ||
7fa84cd8 KW |
976 | assert(!rwco->qiov || rwco->qiov->size == acb->bytes); |
977 | rwco->ret = blk_co_pwritev(rwco->blk, rwco->offset, acb->bytes, | |
57d6a428 KW |
978 | rwco->qiov, rwco->flags); |
979 | blk_aio_complete(acb); | |
980 | } | |
981 | ||
d004bd52 EB |
982 | BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
983 | int count, BdrvRequestFlags flags, | |
984 | BlockCompletionFunc *cb, void *opaque) | |
4be74634 | 985 | { |
983a1600 EB |
986 | return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, |
987 | flags | BDRV_REQ_ZERO_WRITE, cb, opaque); | |
4be74634 MA |
988 | } |
989 | ||
990 | int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) | |
991 | { | |
a55d3fba | 992 | int ret = blk_prw(blk, offset, buf, count, blk_read_entry, 0); |
e7f7d676 HR |
993 | if (ret < 0) { |
994 | return ret; | |
995 | } | |
a55d3fba | 996 | return count; |
4be74634 MA |
997 | } |
998 | ||
8341f00d EB |
999 | int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, |
1000 | BdrvRequestFlags flags) | |
4be74634 | 1001 | { |
8341f00d EB |
1002 | int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, |
1003 | flags); | |
e7f7d676 HR |
1004 | if (ret < 0) { |
1005 | return ret; | |
1006 | } | |
a55d3fba | 1007 | return count; |
4be74634 MA |
1008 | } |
1009 | ||
1010 | int64_t blk_getlength(BlockBackend *blk) | |
1011 | { | |
c09ba36c HR |
1012 | if (!blk_is_available(blk)) { |
1013 | return -ENOMEDIUM; | |
1014 | } | |
1015 | ||
f21d96d0 | 1016 | return bdrv_getlength(blk_bs(blk)); |
4be74634 MA |
1017 | } |
1018 | ||
1019 | void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr) | |
1020 | { | |
f21d96d0 | 1021 | if (!blk_bs(blk)) { |
a46fc9c9 HR |
1022 | *nb_sectors_ptr = 0; |
1023 | } else { | |
f21d96d0 | 1024 | bdrv_get_geometry(blk_bs(blk), nb_sectors_ptr); |
a46fc9c9 | 1025 | } |
4be74634 MA |
1026 | } |
1027 | ||
1ef01253 HR |
1028 | int64_t blk_nb_sectors(BlockBackend *blk) |
1029 | { | |
c09ba36c HR |
1030 | if (!blk_is_available(blk)) { |
1031 | return -ENOMEDIUM; | |
1032 | } | |
1033 | ||
f21d96d0 | 1034 | return bdrv_nb_sectors(blk_bs(blk)); |
1ef01253 HR |
1035 | } |
1036 | ||
60cb2fa7 EB |
1037 | BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, |
1038 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1039 | BlockCompletionFunc *cb, void *opaque) | |
1040 | { | |
1041 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1042 | blk_aio_read_entry, flags, cb, opaque); | |
1043 | } | |
1044 | ||
60cb2fa7 EB |
1045 | BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, |
1046 | QEMUIOVector *qiov, BdrvRequestFlags flags, | |
1047 | BlockCompletionFunc *cb, void *opaque) | |
1048 | { | |
1049 | return blk_aio_prwv(blk, offset, qiov->size, qiov, | |
1050 | blk_aio_write_entry, flags, cb, opaque); | |
1051 | } | |
1052 | ||
4be74634 MA |
1053 | BlockAIOCB *blk_aio_flush(BlockBackend *blk, |
1054 | BlockCompletionFunc *cb, void *opaque) | |
1055 | { | |
c09ba36c | 1056 | if (!blk_is_available(blk)) { |
ca78ecfa | 1057 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1058 | } |
1059 | ||
f21d96d0 | 1060 | return bdrv_aio_flush(blk_bs(blk), cb, opaque); |
4be74634 MA |
1061 | } |
1062 | ||
1063 | BlockAIOCB *blk_aio_discard(BlockBackend *blk, | |
1064 | int64_t sector_num, int nb_sectors, | |
1065 | BlockCompletionFunc *cb, void *opaque) | |
1066 | { | |
e7f7d676 HR |
1067 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1068 | if (ret < 0) { | |
ca78ecfa | 1069 | return blk_abort_aio_request(blk, cb, opaque, ret); |
e7f7d676 HR |
1070 | } |
1071 | ||
f21d96d0 | 1072 | return bdrv_aio_discard(blk_bs(blk), sector_num, nb_sectors, cb, opaque); |
4be74634 MA |
1073 | } |
1074 | ||
1075 | void blk_aio_cancel(BlockAIOCB *acb) | |
1076 | { | |
1077 | bdrv_aio_cancel(acb); | |
1078 | } | |
1079 | ||
1080 | void blk_aio_cancel_async(BlockAIOCB *acb) | |
1081 | { | |
1082 | bdrv_aio_cancel_async(acb); | |
1083 | } | |
1084 | ||
4be74634 MA |
1085 | int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf) |
1086 | { | |
c09ba36c HR |
1087 | if (!blk_is_available(blk)) { |
1088 | return -ENOMEDIUM; | |
1089 | } | |
1090 | ||
f21d96d0 | 1091 | return bdrv_ioctl(blk_bs(blk), req, buf); |
4be74634 MA |
1092 | } |
1093 | ||
1094 | BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, | |
1095 | BlockCompletionFunc *cb, void *opaque) | |
1096 | { | |
c09ba36c | 1097 | if (!blk_is_available(blk)) { |
ca78ecfa | 1098 | return blk_abort_aio_request(blk, cb, opaque, -ENOMEDIUM); |
c09ba36c HR |
1099 | } |
1100 | ||
f21d96d0 | 1101 | return bdrv_aio_ioctl(blk_bs(blk), req, buf, cb, opaque); |
4be74634 MA |
1102 | } |
1103 | ||
2bb0dce7 HR |
1104 | int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) |
1105 | { | |
e7f7d676 HR |
1106 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1107 | if (ret < 0) { | |
1108 | return ret; | |
1109 | } | |
1110 | ||
f21d96d0 | 1111 | return bdrv_co_discard(blk_bs(blk), sector_num, nb_sectors); |
2bb0dce7 HR |
1112 | } |
1113 | ||
1114 | int blk_co_flush(BlockBackend *blk) | |
1115 | { | |
c09ba36c HR |
1116 | if (!blk_is_available(blk)) { |
1117 | return -ENOMEDIUM; | |
1118 | } | |
1119 | ||
f21d96d0 | 1120 | return bdrv_co_flush(blk_bs(blk)); |
2bb0dce7 HR |
1121 | } |
1122 | ||
4be74634 MA |
1123 | int blk_flush(BlockBackend *blk) |
1124 | { | |
c09ba36c HR |
1125 | if (!blk_is_available(blk)) { |
1126 | return -ENOMEDIUM; | |
1127 | } | |
1128 | ||
f21d96d0 | 1129 | return bdrv_flush(blk_bs(blk)); |
4be74634 MA |
1130 | } |
1131 | ||
97b0385a AY |
1132 | void blk_drain(BlockBackend *blk) |
1133 | { | |
f21d96d0 KW |
1134 | if (blk_bs(blk)) { |
1135 | bdrv_drain(blk_bs(blk)); | |
a46fc9c9 | 1136 | } |
97b0385a AY |
1137 | } |
1138 | ||
4be74634 MA |
1139 | void blk_drain_all(void) |
1140 | { | |
1141 | bdrv_drain_all(); | |
1142 | } | |
1143 | ||
373340b2 HR |
1144 | void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error, |
1145 | BlockdevOnError on_write_error) | |
1146 | { | |
1147 | blk->on_read_error = on_read_error; | |
1148 | blk->on_write_error = on_write_error; | |
1149 | } | |
1150 | ||
4be74634 MA |
1151 | BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read) |
1152 | { | |
373340b2 | 1153 | return is_read ? blk->on_read_error : blk->on_write_error; |
4be74634 MA |
1154 | } |
1155 | ||
1156 | BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, | |
1157 | int error) | |
1158 | { | |
373340b2 HR |
1159 | BlockdevOnError on_err = blk_get_on_error(blk, is_read); |
1160 | ||
1161 | switch (on_err) { | |
1162 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
1163 | return (error == ENOSPC) ? | |
1164 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
1165 | case BLOCKDEV_ON_ERROR_STOP: | |
1166 | return BLOCK_ERROR_ACTION_STOP; | |
1167 | case BLOCKDEV_ON_ERROR_REPORT: | |
1168 | return BLOCK_ERROR_ACTION_REPORT; | |
1169 | case BLOCKDEV_ON_ERROR_IGNORE: | |
1170 | return BLOCK_ERROR_ACTION_IGNORE; | |
1171 | default: | |
1172 | abort(); | |
1173 | } | |
4be74634 MA |
1174 | } |
1175 | ||
373340b2 HR |
1176 | static void send_qmp_error_event(BlockBackend *blk, |
1177 | BlockErrorAction action, | |
1178 | bool is_read, int error) | |
1179 | { | |
1180 | IoOperationType optype; | |
1181 | ||
1182 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
1183 | qapi_event_send_block_io_error(blk_name(blk), optype, action, | |
1184 | blk_iostatus_is_enabled(blk), | |
1185 | error == ENOSPC, strerror(error), | |
1186 | &error_abort); | |
1187 | } | |
1188 | ||
1189 | /* This is done by device models because, while the block layer knows | |
1190 | * about the error, it does not know whether an operation comes from | |
1191 | * the device or the block layer (from a job, for example). | |
1192 | */ | |
4be74634 MA |
1193 | void blk_error_action(BlockBackend *blk, BlockErrorAction action, |
1194 | bool is_read, int error) | |
1195 | { | |
373340b2 HR |
1196 | assert(error >= 0); |
1197 | ||
1198 | if (action == BLOCK_ERROR_ACTION_STOP) { | |
1199 | /* First set the iostatus, so that "info block" returns an iostatus | |
1200 | * that matches the events raised so far (an additional error iostatus | |
1201 | * is fine, but not a lost one). | |
1202 | */ | |
1203 | blk_iostatus_set_err(blk, error); | |
1204 | ||
1205 | /* Then raise the request to stop the VM and the event. | |
1206 | * qemu_system_vmstop_request_prepare has two effects. First, | |
1207 | * it ensures that the STOP event always comes after the | |
1208 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
1209 | * can observe the STOP event and do a "cont" before the STOP | |
1210 | * event is issued, the VM will not stop. In this case, vm_start() | |
1211 | * also ensures that the STOP/RESUME pair of events is emitted. | |
1212 | */ | |
1213 | qemu_system_vmstop_request_prepare(); | |
1214 | send_qmp_error_event(blk, action, is_read, error); | |
1215 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); | |
1216 | } else { | |
1217 | send_qmp_error_event(blk, action, is_read, error); | |
1218 | } | |
4be74634 MA |
1219 | } |
1220 | ||
1221 | int blk_is_read_only(BlockBackend *blk) | |
1222 | { | |
f21d96d0 KW |
1223 | BlockDriverState *bs = blk_bs(blk); |
1224 | ||
1225 | if (bs) { | |
1226 | return bdrv_is_read_only(bs); | |
061959e8 HR |
1227 | } else { |
1228 | return blk->root_state.read_only; | |
1229 | } | |
4be74634 MA |
1230 | } |
1231 | ||
1232 | int blk_is_sg(BlockBackend *blk) | |
1233 | { | |
f21d96d0 KW |
1234 | BlockDriverState *bs = blk_bs(blk); |
1235 | ||
1236 | if (!bs) { | |
a46fc9c9 HR |
1237 | return 0; |
1238 | } | |
1239 | ||
f21d96d0 | 1240 | return bdrv_is_sg(bs); |
4be74634 MA |
1241 | } |
1242 | ||
1243 | int blk_enable_write_cache(BlockBackend *blk) | |
1244 | { | |
bfd18d1e | 1245 | return blk->enable_write_cache; |
4be74634 MA |
1246 | } |
1247 | ||
1248 | void blk_set_enable_write_cache(BlockBackend *blk, bool wce) | |
1249 | { | |
bfd18d1e | 1250 | blk->enable_write_cache = wce; |
4be74634 MA |
1251 | } |
1252 | ||
2bb0dce7 HR |
1253 | void blk_invalidate_cache(BlockBackend *blk, Error **errp) |
1254 | { | |
f21d96d0 KW |
1255 | BlockDriverState *bs = blk_bs(blk); |
1256 | ||
1257 | if (!bs) { | |
c09ba36c HR |
1258 | error_setg(errp, "Device '%s' has no medium", blk->name); |
1259 | return; | |
1260 | } | |
1261 | ||
f21d96d0 | 1262 | bdrv_invalidate_cache(bs, errp); |
2bb0dce7 HR |
1263 | } |
1264 | ||
e031f750 | 1265 | bool blk_is_inserted(BlockBackend *blk) |
4be74634 | 1266 | { |
f21d96d0 KW |
1267 | BlockDriverState *bs = blk_bs(blk); |
1268 | ||
1269 | return bs && bdrv_is_inserted(bs); | |
db0284f8 HR |
1270 | } |
1271 | ||
1272 | bool blk_is_available(BlockBackend *blk) | |
1273 | { | |
1274 | return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk); | |
4be74634 MA |
1275 | } |
1276 | ||
1277 | void blk_lock_medium(BlockBackend *blk, bool locked) | |
1278 | { | |
f21d96d0 KW |
1279 | BlockDriverState *bs = blk_bs(blk); |
1280 | ||
1281 | if (bs) { | |
1282 | bdrv_lock_medium(bs, locked); | |
a46fc9c9 | 1283 | } |
4be74634 MA |
1284 | } |
1285 | ||
1286 | void blk_eject(BlockBackend *blk, bool eject_flag) | |
1287 | { | |
f21d96d0 KW |
1288 | BlockDriverState *bs = blk_bs(blk); |
1289 | ||
1290 | if (bs) { | |
1291 | bdrv_eject(bs, eject_flag); | |
a46fc9c9 | 1292 | } |
4be74634 MA |
1293 | } |
1294 | ||
1295 | int blk_get_flags(BlockBackend *blk) | |
1296 | { | |
f21d96d0 KW |
1297 | BlockDriverState *bs = blk_bs(blk); |
1298 | ||
1299 | if (bs) { | |
1300 | return bdrv_get_flags(bs); | |
061959e8 HR |
1301 | } else { |
1302 | return blk->root_state.open_flags; | |
1303 | } | |
4be74634 MA |
1304 | } |
1305 | ||
454057b7 PL |
1306 | int blk_get_max_transfer_length(BlockBackend *blk) |
1307 | { | |
f21d96d0 KW |
1308 | BlockDriverState *bs = blk_bs(blk); |
1309 | ||
1310 | if (bs) { | |
1311 | return bs->bl.max_transfer_length; | |
a46fc9c9 HR |
1312 | } else { |
1313 | return 0; | |
1314 | } | |
454057b7 PL |
1315 | } |
1316 | ||
648296e0 SH |
1317 | int blk_get_max_iov(BlockBackend *blk) |
1318 | { | |
f21d96d0 | 1319 | return blk->root->bs->bl.max_iov; |
648296e0 SH |
1320 | } |
1321 | ||
4be74634 MA |
1322 | void blk_set_guest_block_size(BlockBackend *blk, int align) |
1323 | { | |
68e9ec01 | 1324 | blk->guest_block_size = align; |
4be74634 MA |
1325 | } |
1326 | ||
f1c17521 PB |
1327 | void *blk_try_blockalign(BlockBackend *blk, size_t size) |
1328 | { | |
f21d96d0 | 1329 | return qemu_try_blockalign(blk ? blk_bs(blk) : NULL, size); |
f1c17521 PB |
1330 | } |
1331 | ||
4be74634 MA |
1332 | void *blk_blockalign(BlockBackend *blk, size_t size) |
1333 | { | |
f21d96d0 | 1334 | return qemu_blockalign(blk ? blk_bs(blk) : NULL, size); |
4be74634 MA |
1335 | } |
1336 | ||
1337 | bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp) | |
1338 | { | |
f21d96d0 KW |
1339 | BlockDriverState *bs = blk_bs(blk); |
1340 | ||
1341 | if (!bs) { | |
a46fc9c9 HR |
1342 | return false; |
1343 | } | |
1344 | ||
f21d96d0 | 1345 | return bdrv_op_is_blocked(bs, op, errp); |
4be74634 MA |
1346 | } |
1347 | ||
1348 | void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason) | |
1349 | { | |
f21d96d0 KW |
1350 | BlockDriverState *bs = blk_bs(blk); |
1351 | ||
1352 | if (bs) { | |
1353 | bdrv_op_unblock(bs, op, reason); | |
a46fc9c9 | 1354 | } |
4be74634 MA |
1355 | } |
1356 | ||
1357 | void blk_op_block_all(BlockBackend *blk, Error *reason) | |
1358 | { | |
f21d96d0 KW |
1359 | BlockDriverState *bs = blk_bs(blk); |
1360 | ||
1361 | if (bs) { | |
1362 | bdrv_op_block_all(bs, reason); | |
a46fc9c9 | 1363 | } |
4be74634 MA |
1364 | } |
1365 | ||
1366 | void blk_op_unblock_all(BlockBackend *blk, Error *reason) | |
1367 | { | |
f21d96d0 KW |
1368 | BlockDriverState *bs = blk_bs(blk); |
1369 | ||
1370 | if (bs) { | |
1371 | bdrv_op_unblock_all(bs, reason); | |
a46fc9c9 | 1372 | } |
4be74634 MA |
1373 | } |
1374 | ||
1375 | AioContext *blk_get_aio_context(BlockBackend *blk) | |
1376 | { | |
f21d96d0 KW |
1377 | BlockDriverState *bs = blk_bs(blk); |
1378 | ||
1379 | if (bs) { | |
1380 | return bdrv_get_aio_context(bs); | |
4981bdec HR |
1381 | } else { |
1382 | return qemu_get_aio_context(); | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb) | |
1387 | { | |
1388 | BlockBackendAIOCB *blk_acb = DO_UPCAST(BlockBackendAIOCB, common, acb); | |
1389 | return blk_get_aio_context(blk_acb->blk); | |
4be74634 MA |
1390 | } |
1391 | ||
1392 | void blk_set_aio_context(BlockBackend *blk, AioContext *new_context) | |
1393 | { | |
f21d96d0 KW |
1394 | BlockDriverState *bs = blk_bs(blk); |
1395 | ||
1396 | if (bs) { | |
7ca7f0f6 KW |
1397 | if (blk->public.throttle_state) { |
1398 | throttle_timers_detach_aio_context(&blk->public.throttle_timers); | |
1399 | } | |
f21d96d0 | 1400 | bdrv_set_aio_context(bs, new_context); |
7ca7f0f6 KW |
1401 | if (blk->public.throttle_state) { |
1402 | throttle_timers_attach_aio_context(&blk->public.throttle_timers, | |
1403 | new_context); | |
1404 | } | |
a46fc9c9 | 1405 | } |
4be74634 MA |
1406 | } |
1407 | ||
2019ba0a HR |
1408 | void blk_add_aio_context_notifier(BlockBackend *blk, |
1409 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1410 | void (*detach_aio_context)(void *opaque), void *opaque) | |
1411 | { | |
f21d96d0 KW |
1412 | BlockDriverState *bs = blk_bs(blk); |
1413 | ||
1414 | if (bs) { | |
1415 | bdrv_add_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1416 | detach_aio_context, opaque); |
1417 | } | |
2019ba0a HR |
1418 | } |
1419 | ||
1420 | void blk_remove_aio_context_notifier(BlockBackend *blk, | |
1421 | void (*attached_aio_context)(AioContext *, | |
1422 | void *), | |
1423 | void (*detach_aio_context)(void *), | |
1424 | void *opaque) | |
1425 | { | |
f21d96d0 KW |
1426 | BlockDriverState *bs = blk_bs(blk); |
1427 | ||
1428 | if (bs) { | |
1429 | bdrv_remove_aio_context_notifier(bs, attached_aio_context, | |
a46fc9c9 HR |
1430 | detach_aio_context, opaque); |
1431 | } | |
2019ba0a HR |
1432 | } |
1433 | ||
3301f6c6 HR |
1434 | void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) |
1435 | { | |
1436 | notifier_list_add(&blk->remove_bs_notifiers, notify); | |
1437 | } | |
1438 | ||
1439 | void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) | |
1440 | { | |
1441 | notifier_list_add(&blk->insert_bs_notifiers, notify); | |
1442 | } | |
1443 | ||
4be74634 MA |
1444 | void blk_io_plug(BlockBackend *blk) |
1445 | { | |
f21d96d0 KW |
1446 | BlockDriverState *bs = blk_bs(blk); |
1447 | ||
1448 | if (bs) { | |
1449 | bdrv_io_plug(bs); | |
a46fc9c9 | 1450 | } |
4be74634 MA |
1451 | } |
1452 | ||
1453 | void blk_io_unplug(BlockBackend *blk) | |
1454 | { | |
f21d96d0 KW |
1455 | BlockDriverState *bs = blk_bs(blk); |
1456 | ||
1457 | if (bs) { | |
1458 | bdrv_io_unplug(bs); | |
a46fc9c9 | 1459 | } |
4be74634 MA |
1460 | } |
1461 | ||
1462 | BlockAcctStats *blk_get_stats(BlockBackend *blk) | |
1463 | { | |
7f0e9da6 | 1464 | return &blk->stats; |
4be74634 MA |
1465 | } |
1466 | ||
1467 | void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, | |
1468 | BlockCompletionFunc *cb, void *opaque) | |
1469 | { | |
1470 | return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); | |
1471 | } | |
1ef01253 | 1472 | |
d004bd52 EB |
1473 | int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, |
1474 | int count, BdrvRequestFlags flags) | |
1ef01253 | 1475 | { |
983a1600 | 1476 | return blk_co_pwritev(blk, offset, count, NULL, |
16aaf975 | 1477 | flags | BDRV_REQ_ZERO_WRITE); |
1ef01253 HR |
1478 | } |
1479 | ||
1480 | int blk_write_compressed(BlockBackend *blk, int64_t sector_num, | |
1481 | const uint8_t *buf, int nb_sectors) | |
1482 | { | |
e7f7d676 HR |
1483 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1484 | if (ret < 0) { | |
1485 | return ret; | |
1486 | } | |
1487 | ||
f21d96d0 | 1488 | return bdrv_write_compressed(blk_bs(blk), sector_num, buf, nb_sectors); |
1ef01253 HR |
1489 | } |
1490 | ||
1491 | int blk_truncate(BlockBackend *blk, int64_t offset) | |
1492 | { | |
c09ba36c HR |
1493 | if (!blk_is_available(blk)) { |
1494 | return -ENOMEDIUM; | |
1495 | } | |
1496 | ||
f21d96d0 | 1497 | return bdrv_truncate(blk_bs(blk), offset); |
1ef01253 HR |
1498 | } |
1499 | ||
1500 | int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors) | |
1501 | { | |
e7f7d676 HR |
1502 | int ret = blk_check_request(blk, sector_num, nb_sectors); |
1503 | if (ret < 0) { | |
1504 | return ret; | |
1505 | } | |
1506 | ||
f21d96d0 | 1507 | return bdrv_discard(blk_bs(blk), sector_num, nb_sectors); |
1ef01253 HR |
1508 | } |
1509 | ||
1510 | int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, | |
1511 | int64_t pos, int size) | |
1512 | { | |
bfd18d1e KW |
1513 | int ret; |
1514 | ||
c09ba36c HR |
1515 | if (!blk_is_available(blk)) { |
1516 | return -ENOMEDIUM; | |
1517 | } | |
1518 | ||
bfd18d1e KW |
1519 | ret = bdrv_save_vmstate(blk_bs(blk), buf, pos, size); |
1520 | if (ret < 0) { | |
1521 | return ret; | |
1522 | } | |
1523 | ||
1524 | if (ret == size && !blk->enable_write_cache) { | |
1525 | ret = bdrv_flush(blk_bs(blk)); | |
1526 | } | |
1527 | ||
1528 | return ret < 0 ? ret : size; | |
1ef01253 HR |
1529 | } |
1530 | ||
1531 | int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) | |
1532 | { | |
c09ba36c HR |
1533 | if (!blk_is_available(blk)) { |
1534 | return -ENOMEDIUM; | |
1535 | } | |
1536 | ||
f21d96d0 | 1537 | return bdrv_load_vmstate(blk_bs(blk), buf, pos, size); |
1ef01253 | 1538 | } |
f0272c4d ET |
1539 | |
1540 | int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) | |
1541 | { | |
c09ba36c HR |
1542 | if (!blk_is_available(blk)) { |
1543 | return -ENOMEDIUM; | |
1544 | } | |
1545 | ||
f21d96d0 | 1546 | return bdrv_probe_blocksizes(blk_bs(blk), bsz); |
f0272c4d ET |
1547 | } |
1548 | ||
1549 | int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo) | |
1550 | { | |
c09ba36c HR |
1551 | if (!blk_is_available(blk)) { |
1552 | return -ENOMEDIUM; | |
1553 | } | |
1554 | ||
f21d96d0 | 1555 | return bdrv_probe_geometry(blk_bs(blk), geo); |
f0272c4d | 1556 | } |
281d22d8 HR |
1557 | |
1558 | /* | |
1559 | * Updates the BlockBackendRootState object with data from the currently | |
1560 | * attached BlockDriverState. | |
1561 | */ | |
1562 | void blk_update_root_state(BlockBackend *blk) | |
1563 | { | |
f21d96d0 | 1564 | assert(blk->root); |
281d22d8 | 1565 | |
f21d96d0 KW |
1566 | blk->root_state.open_flags = blk->root->bs->open_flags; |
1567 | blk->root_state.read_only = blk->root->bs->read_only; | |
1568 | blk->root_state.detect_zeroes = blk->root->bs->detect_zeroes; | |
281d22d8 HR |
1569 | } |
1570 | ||
38cb18f5 HR |
1571 | /* |
1572 | * Applies the information in the root state to the given BlockDriverState. This | |
1573 | * does not include the flags which have to be specified for bdrv_open(), use | |
1574 | * blk_get_open_flags_from_root_state() to inquire them. | |
1575 | */ | |
1576 | void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs) | |
1577 | { | |
1578 | bs->detect_zeroes = blk->root_state.detect_zeroes; | |
38cb18f5 HR |
1579 | } |
1580 | ||
1581 | /* | |
1582 | * Returns the flags to be used for bdrv_open() of a BlockDriverState which is | |
1583 | * supposed to inherit the root state. | |
1584 | */ | |
1585 | int blk_get_open_flags_from_root_state(BlockBackend *blk) | |
1586 | { | |
1587 | int bs_flags; | |
1588 | ||
1589 | bs_flags = blk->root_state.read_only ? 0 : BDRV_O_RDWR; | |
1590 | bs_flags |= blk->root_state.open_flags & ~BDRV_O_RDWR; | |
1591 | ||
1592 | return bs_flags; | |
1593 | } | |
1594 | ||
281d22d8 HR |
1595 | BlockBackendRootState *blk_get_root_state(BlockBackend *blk) |
1596 | { | |
1597 | return &blk->root_state; | |
1598 | } | |
1393f212 HR |
1599 | |
1600 | int blk_commit_all(void) | |
1601 | { | |
fe1a9cbc HR |
1602 | BlockBackend *blk = NULL; |
1603 | ||
1604 | while ((blk = blk_all_next(blk)) != NULL) { | |
1605 | AioContext *aio_context = blk_get_aio_context(blk); | |
1606 | ||
1607 | aio_context_acquire(aio_context); | |
f21d96d0 KW |
1608 | if (blk_is_inserted(blk) && blk->root->bs->backing) { |
1609 | int ret = bdrv_commit(blk->root->bs); | |
fe1a9cbc HR |
1610 | if (ret < 0) { |
1611 | aio_context_release(aio_context); | |
1612 | return ret; | |
1613 | } | |
1614 | } | |
1615 | aio_context_release(aio_context); | |
1616 | } | |
1617 | return 0; | |
1618 | } | |
1619 | ||
1620 | int blk_flush_all(void) | |
1621 | { | |
1622 | BlockBackend *blk = NULL; | |
1623 | int result = 0; | |
1624 | ||
1625 | while ((blk = blk_all_next(blk)) != NULL) { | |
1626 | AioContext *aio_context = blk_get_aio_context(blk); | |
1627 | int ret; | |
1628 | ||
1629 | aio_context_acquire(aio_context); | |
1630 | if (blk_is_inserted(blk)) { | |
1631 | ret = blk_flush(blk); | |
1632 | if (ret < 0 && !result) { | |
1633 | result = ret; | |
1634 | } | |
1635 | } | |
1636 | aio_context_release(aio_context); | |
1637 | } | |
1638 | ||
1639 | return result; | |
1393f212 | 1640 | } |
97148076 KW |
1641 | |
1642 | ||
1643 | /* throttling disk I/O limits */ | |
1644 | void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg) | |
1645 | { | |
1646 | throttle_group_config(blk, cfg); | |
1647 | } | |
1648 | ||
1649 | void blk_io_limits_disable(BlockBackend *blk) | |
1650 | { | |
1651 | assert(blk->public.throttle_state); | |
c2066af0 | 1652 | bdrv_drained_begin(blk_bs(blk)); |
97148076 | 1653 | throttle_group_unregister_blk(blk); |
c2066af0 | 1654 | bdrv_drained_end(blk_bs(blk)); |
97148076 KW |
1655 | } |
1656 | ||
1657 | /* should be called before blk_set_io_limits if a limit is set */ | |
1658 | void blk_io_limits_enable(BlockBackend *blk, const char *group) | |
1659 | { | |
1660 | assert(!blk->public.throttle_state); | |
1661 | throttle_group_register_blk(blk, group); | |
1662 | } | |
1663 | ||
1664 | void blk_io_limits_update_group(BlockBackend *blk, const char *group) | |
1665 | { | |
1666 | /* this BB is not part of any group */ | |
1667 | if (!blk->public.throttle_state) { | |
1668 | return; | |
1669 | } | |
1670 | ||
1671 | /* this BB is a part of the same group than the one we want */ | |
1672 | if (!g_strcmp0(throttle_group_get_name(blk), group)) { | |
1673 | return; | |
1674 | } | |
1675 | ||
1676 | /* need to change the group this bs belong to */ | |
1677 | blk_io_limits_disable(blk); | |
1678 | blk_io_limits_enable(blk, group); | |
1679 | } | |
c2066af0 KW |
1680 | |
1681 | static void blk_root_drained_begin(BdrvChild *child) | |
1682 | { | |
1683 | BlockBackend *blk = child->opaque; | |
1684 | ||
36fe1331 KW |
1685 | /* Note that blk->root may not be accessible here yet if we are just |
1686 | * attaching to a BlockDriverState that is drained. Use child instead. */ | |
1687 | ||
c2066af0 KW |
1688 | if (blk->public.io_limits_disabled++ == 0) { |
1689 | throttle_group_restart_blk(blk); | |
1690 | } | |
1691 | } | |
1692 | ||
1693 | static void blk_root_drained_end(BdrvChild *child) | |
1694 | { | |
1695 | BlockBackend *blk = child->opaque; | |
1696 | ||
1697 | assert(blk->public.io_limits_disabled); | |
1698 | --blk->public.io_limits_disabled; | |
1699 | } |