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ea2384d3 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
ea2384d3 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
ea2384d3 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #ifndef BLOCK_INT_H | |
25 | #define BLOCK_INT_H | |
26 | ||
5e5a94b6 | 27 | #include "block/accounting.h" |
737e150e | 28 | #include "block/block.h" |
7719f3c9 | 29 | #include "block/aio-wait.h" |
1de7afc9 | 30 | #include "qemu/queue.h" |
10817bf0 | 31 | #include "qemu/coroutine.h" |
f7946da2 | 32 | #include "qemu/stats64.h" |
1de7afc9 | 33 | #include "qemu/timer.h" |
8f0720ec | 34 | #include "qemu/hbitmap.h" |
f364ec65 | 35 | #include "block/snapshot.h" |
6a1751b7 | 36 | #include "qemu/main-loop.h" |
cc0681c4 | 37 | #include "qemu/throttle.h" |
faf07963 | 38 | |
bfe8043e | 39 | #define BLOCK_FLAG_LAZY_REFCOUNTS 8 |
ec36ba14 | 40 | |
bfe8043e SH |
41 | #define BLOCK_OPT_SIZE "size" |
42 | #define BLOCK_OPT_ENCRYPT "encryption" | |
0cb8d47b | 43 | #define BLOCK_OPT_ENCRYPT_FORMAT "encrypt.format" |
bfe8043e | 44 | #define BLOCK_OPT_COMPAT6 "compat6" |
f249924e | 45 | #define BLOCK_OPT_HWVERSION "hwversion" |
bfe8043e SH |
46 | #define BLOCK_OPT_BACKING_FILE "backing_file" |
47 | #define BLOCK_OPT_BACKING_FMT "backing_fmt" | |
48 | #define BLOCK_OPT_CLUSTER_SIZE "cluster_size" | |
49 | #define BLOCK_OPT_TABLE_SIZE "table_size" | |
50 | #define BLOCK_OPT_PREALLOC "preallocation" | |
51 | #define BLOCK_OPT_SUBFMT "subformat" | |
52 | #define BLOCK_OPT_COMPAT_LEVEL "compat" | |
53 | #define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts" | |
7f2039f6 | 54 | #define BLOCK_OPT_ADAPTER_TYPE "adapter_type" |
b3af018f | 55 | #define BLOCK_OPT_REDUNDANCY "redundancy" |
4ab15590 | 56 | #define BLOCK_OPT_NOCOW "nocow" |
876eb1b0 | 57 | #define BLOCK_OPT_OBJECT_SIZE "object_size" |
06d05fa7 | 58 | #define BLOCK_OPT_REFCOUNT_BITS "refcount_bits" |
dcc98687 | 59 | #define BLOCK_OPT_DATA_FILE "data_file" |
6c3944dc | 60 | #define BLOCK_OPT_DATA_FILE_RAW "data_file_raw" |
0e7e1989 | 61 | |
7cddd372 KW |
62 | #define BLOCK_PROBE_BUF_SIZE 512 |
63 | ||
ebde595c FZ |
64 | enum BdrvTrackedRequestType { |
65 | BDRV_TRACKED_READ, | |
66 | BDRV_TRACKED_WRITE, | |
ebde595c | 67 | BDRV_TRACKED_DISCARD, |
1bc5f09f | 68 | BDRV_TRACKED_TRUNCATE, |
ebde595c FZ |
69 | }; |
70 | ||
d616b224 SH |
71 | typedef struct BdrvTrackedRequest { |
72 | BlockDriverState *bs; | |
793ed47a | 73 | int64_t offset; |
22931a15 | 74 | uint64_t bytes; |
ebde595c | 75 | enum BdrvTrackedRequestType type; |
7327145f | 76 | |
2dbafdc0 | 77 | bool serialising; |
7327145f | 78 | int64_t overlap_offset; |
22931a15 | 79 | uint64_t overlap_bytes; |
7327145f | 80 | |
d616b224 SH |
81 | QLIST_ENTRY(BdrvTrackedRequest) list; |
82 | Coroutine *co; /* owner, used for deadlock detection */ | |
83 | CoQueue wait_queue; /* coroutines blocked on this request */ | |
6460440f KW |
84 | |
85 | struct BdrvTrackedRequest *waiting_for; | |
d616b224 SH |
86 | } BdrvTrackedRequest; |
87 | ||
ea2384d3 FB |
88 | struct BlockDriver { |
89 | const char *format_name; | |
90 | int instance_size; | |
f6186f49 | 91 | |
5a612c00 MP |
92 | /* set to true if the BlockDriver is a block filter. Block filters pass |
93 | * certain callbacks that refer to data (see block.c) to their bs->file if | |
94 | * the driver doesn't implement them. Drivers that do not wish to forward | |
95 | * must implement them and return -ENOTSUP. | |
96 | */ | |
b5042a36 BC |
97 | bool is_filter; |
98 | /* for snapshots block filter like Quorum can implement the | |
99 | * following recursive callback. | |
212a5a8f BC |
100 | * It's purpose is to recurse on the filter children while calling |
101 | * bdrv_recurse_is_first_non_filter on them. | |
102 | * For a sample implementation look in the future Quorum block filter. | |
f6186f49 | 103 | */ |
212a5a8f BC |
104 | bool (*bdrv_recurse_is_first_non_filter)(BlockDriverState *bs, |
105 | BlockDriverState *candidate); | |
f6186f49 | 106 | |
ea2384d3 | 107 | int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); |
508c7cb3 | 108 | int (*bdrv_probe_device)(const char *filename); |
c2ad1b0c KW |
109 | |
110 | /* Any driver implementing this callback is expected to be able to handle | |
111 | * NULL file names in its .bdrv_open() implementation */ | |
6963a30d | 112 | void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp); |
030be321 BC |
113 | /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have |
114 | * this field set to true, except ones that are defined only by their | |
115 | * child's bs. | |
116 | * An example of the last type will be the quorum block driver. | |
117 | */ | |
118 | bool bdrv_needs_filename; | |
e971aa12 | 119 | |
8ee79e70 KW |
120 | /* Set if a driver can support backing files */ |
121 | bool supports_backing; | |
122 | ||
e971aa12 JC |
123 | /* For handling image reopen for split or non-split files */ |
124 | int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state, | |
125 | BlockReopenQueue *queue, Error **errp); | |
126 | void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state); | |
127 | void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state); | |
5365f44d | 128 | void (*bdrv_join_options)(QDict *options, QDict *old_options); |
e971aa12 | 129 | |
015a1036 HR |
130 | int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags, |
131 | Error **errp); | |
1e486cf3 FR |
132 | |
133 | /* Protocol drivers should implement this instead of bdrv_open */ | |
015a1036 HR |
134 | int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags, |
135 | Error **errp); | |
e2731add | 136 | void (*bdrv_close)(BlockDriverState *bs); |
b0292b85 | 137 | int coroutine_fn (*bdrv_co_create)(BlockdevCreateOptions *opts, |
efc75e2a | 138 | Error **errp); |
b0292b85 KW |
139 | int coroutine_fn (*bdrv_co_create_opts)(const char *filename, |
140 | QemuOpts *opts, | |
141 | Error **errp); | |
95389c86 | 142 | int (*bdrv_make_empty)(BlockDriverState *bs); |
91af7014 | 143 | |
998b3a1e HR |
144 | /* |
145 | * Refreshes the bs->exact_filename field. If that is impossible, | |
146 | * bs->exact_filename has to be left empty. | |
147 | */ | |
148 | void (*bdrv_refresh_filename)(BlockDriverState *bs); | |
91af7014 | 149 | |
abc521a9 HR |
150 | /* |
151 | * Gathers the open options for all children into @target. | |
152 | * A simple format driver (without backing file support) might | |
153 | * implement this function like this: | |
154 | * | |
155 | * QINCREF(bs->file->bs->full_open_options); | |
156 | * qdict_put(target, "file", bs->file->bs->full_open_options); | |
157 | * | |
158 | * If not specified, the generic implementation will simply put | |
159 | * all children's options under their respective name. | |
160 | * | |
161 | * @backing_overridden is true when bs->backing seems not to be | |
162 | * the child that would result from opening bs->backing_file. | |
163 | * Therefore, if it is true, the backing child's options should be | |
164 | * gathered; otherwise, there is no need since the backing child | |
165 | * is the one implied by the image header. | |
166 | * | |
167 | * Note that ideally this function would not be needed. Every | |
168 | * block driver which implements it is probably doing something | |
169 | * shady regarding its runtime option structure. | |
170 | */ | |
171 | void (*bdrv_gather_child_options)(BlockDriverState *bs, QDict *target, | |
172 | bool backing_overridden); | |
173 | ||
1e89d0f9 HR |
174 | /* |
175 | * Returns an allocated string which is the directory name of this BDS: It | |
176 | * will be used to make relative filenames absolute by prepending this | |
177 | * function's return value to them. | |
178 | */ | |
179 | char *(*bdrv_dirname)(BlockDriverState *bs, Error **errp); | |
180 | ||
83f64091 | 181 | /* aio */ |
e31f6864 EB |
182 | BlockAIOCB *(*bdrv_aio_preadv)(BlockDriverState *bs, |
183 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags, | |
184 | BlockCompletionFunc *cb, void *opaque); | |
e31f6864 EB |
185 | BlockAIOCB *(*bdrv_aio_pwritev)(BlockDriverState *bs, |
186 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags, | |
187 | BlockCompletionFunc *cb, void *opaque); | |
7c84b1b8 | 188 | BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, |
097310b5 | 189 | BlockCompletionFunc *cb, void *opaque); |
4da444a0 | 190 | BlockAIOCB *(*bdrv_aio_pdiscard)(BlockDriverState *bs, |
f5a5ca79 | 191 | int64_t offset, int bytes, |
097310b5 | 192 | BlockCompletionFunc *cb, void *opaque); |
83f64091 | 193 | |
da1fa91d KW |
194 | int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs, |
195 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); | |
64182a6b DB |
196 | |
197 | /** | |
198 | * @offset: position in bytes to read at | |
199 | * @bytes: number of bytes to read | |
200 | * @qiov: the buffers to fill with read data | |
201 | * @flags: currently unused, always 0 | |
202 | * | |
203 | * @offset and @bytes will be a multiple of 'request_alignment', | |
204 | * but the length of individual @qiov elements does not have to | |
205 | * be a multiple. | |
206 | * | |
207 | * @bytes will always equal the total size of @qiov, and will be | |
208 | * no larger than 'max_transfer'. | |
209 | * | |
210 | * The buffer in @qiov may point directly to guest memory. | |
211 | */ | |
3fb06697 KW |
212 | int coroutine_fn (*bdrv_co_preadv)(BlockDriverState *bs, |
213 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags); | |
da1fa91d | 214 | int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs, |
93f5e6d8 | 215 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, int flags); |
64182a6b DB |
216 | /** |
217 | * @offset: position in bytes to write at | |
218 | * @bytes: number of bytes to write | |
219 | * @qiov: the buffers containing data to write | |
220 | * @flags: zero or more bits allowed by 'supported_write_flags' | |
221 | * | |
222 | * @offset and @bytes will be a multiple of 'request_alignment', | |
223 | * but the length of individual @qiov elements does not have to | |
224 | * be a multiple. | |
225 | * | |
226 | * @bytes will always equal the total size of @qiov, and will be | |
227 | * no larger than 'max_transfer'. | |
228 | * | |
229 | * The buffer in @qiov may point directly to guest memory. | |
230 | */ | |
3fb06697 KW |
231 | int coroutine_fn (*bdrv_co_pwritev)(BlockDriverState *bs, |
232 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags); | |
93f5e6d8 | 233 | |
f08f2dda SH |
234 | /* |
235 | * Efficiently zero a region of the disk image. Typically an image format | |
236 | * would use a compact metadata representation to implement this. This | |
465fe887 EB |
237 | * function pointer may be NULL or return -ENOSUP and .bdrv_co_writev() |
238 | * will be called instead. | |
f08f2dda | 239 | */ |
d05aa8bb | 240 | int coroutine_fn (*bdrv_co_pwrite_zeroes)(BlockDriverState *bs, |
f5a5ca79 | 241 | int64_t offset, int bytes, BdrvRequestFlags flags); |
47a5486d | 242 | int coroutine_fn (*bdrv_co_pdiscard)(BlockDriverState *bs, |
f5a5ca79 | 243 | int64_t offset, int bytes); |
4c41cb49 | 244 | |
fcc67678 FZ |
245 | /* Map [offset, offset + nbytes) range onto a child of @bs to copy from, |
246 | * and invoke bdrv_co_copy_range_from(child, ...), or invoke | |
247 | * bdrv_co_copy_range_to() if @bs is the leaf child to copy data from. | |
248 | * | |
249 | * See the comment of bdrv_co_copy_range for the parameter and return value | |
250 | * semantics. | |
251 | */ | |
252 | int coroutine_fn (*bdrv_co_copy_range_from)(BlockDriverState *bs, | |
253 | BdrvChild *src, | |
254 | uint64_t offset, | |
255 | BdrvChild *dst, | |
256 | uint64_t dst_offset, | |
257 | uint64_t bytes, | |
67b51fb9 VSO |
258 | BdrvRequestFlags read_flags, |
259 | BdrvRequestFlags write_flags); | |
fcc67678 FZ |
260 | |
261 | /* Map [offset, offset + nbytes) range onto a child of bs to copy data to, | |
262 | * and invoke bdrv_co_copy_range_to(child, src, ...), or perform the copy | |
263 | * operation if @bs is the leaf and @src has the same BlockDriver. Return | |
264 | * -ENOTSUP if @bs is the leaf but @src has a different BlockDriver. | |
265 | * | |
266 | * See the comment of bdrv_co_copy_range for the parameter and return value | |
267 | * semantics. | |
268 | */ | |
269 | int coroutine_fn (*bdrv_co_copy_range_to)(BlockDriverState *bs, | |
270 | BdrvChild *src, | |
271 | uint64_t src_offset, | |
272 | BdrvChild *dst, | |
273 | uint64_t dst_offset, | |
274 | uint64_t bytes, | |
67b51fb9 VSO |
275 | BdrvRequestFlags read_flags, |
276 | BdrvRequestFlags write_flags); | |
fcc67678 | 277 | |
4c41cb49 | 278 | /* |
298a1665 EB |
279 | * Building block for bdrv_block_status[_above] and |
280 | * bdrv_is_allocated[_above]. The driver should answer only | |
86a3d5c6 EB |
281 | * according to the current layer, and should only need to set |
282 | * BDRV_BLOCK_DATA, BDRV_BLOCK_ZERO, BDRV_BLOCK_OFFSET_VALID, | |
283 | * and/or BDRV_BLOCK_RAW; if the current layer defers to a backing | |
284 | * layer, the result should be 0 (and not BDRV_BLOCK_ZERO). See | |
285 | * block.h for the overall meaning of the bits. As a hint, the | |
286 | * flag want_zero is true if the caller cares more about precise | |
287 | * mappings (favor accurate _OFFSET_VALID/_ZERO) or false for | |
288 | * overall allocation (favor larger *pnum, perhaps by reporting | |
289 | * _DATA instead of _ZERO). The block layer guarantees input | |
290 | * clamped to bdrv_getlength() and aligned to request_alignment, | |
291 | * as well as non-NULL pnum, map, and file; in turn, the driver | |
292 | * must return an error or set pnum to an aligned non-zero value. | |
4c41cb49 | 293 | */ |
86a3d5c6 EB |
294 | int coroutine_fn (*bdrv_co_block_status)(BlockDriverState *bs, |
295 | bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum, | |
296 | int64_t *map, BlockDriverState **file); | |
da1fa91d | 297 | |
0f15423c AL |
298 | /* |
299 | * Invalidate any cached meta-data. | |
300 | */ | |
2b148f39 PB |
301 | void coroutine_fn (*bdrv_co_invalidate_cache)(BlockDriverState *bs, |
302 | Error **errp); | |
76b1c7fe | 303 | int (*bdrv_inactivate)(BlockDriverState *bs); |
0f15423c | 304 | |
c32b82af PD |
305 | /* |
306 | * Flushes all data for all layers by calling bdrv_co_flush for underlying | |
307 | * layers, if needed. This function is needed for deterministic | |
308 | * synchronization of the flush finishing callback. | |
309 | */ | |
310 | int coroutine_fn (*bdrv_co_flush)(BlockDriverState *bs); | |
311 | ||
c68b89ac KW |
312 | /* |
313 | * Flushes all data that was already written to the OS all the way down to | |
c1bb86cd | 314 | * the disk (for example file-posix.c calls fsync()). |
c68b89ac KW |
315 | */ |
316 | int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs); | |
317 | ||
eb489bb1 KW |
318 | /* |
319 | * Flushes all internal caches to the OS. The data may still sit in a | |
320 | * writeback cache of the host OS, but it will survive a crash of the qemu | |
321 | * process. | |
322 | */ | |
323 | int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs); | |
324 | ||
1e486cf3 FR |
325 | /* |
326 | * Drivers setting this field must be able to work with just a plain | |
327 | * filename with '<protocol_name>:' as a prefix, and no other options. | |
328 | * Options may be extracted from the filename by implementing | |
329 | * bdrv_parse_filename. | |
330 | */ | |
83f64091 | 331 | const char *protocol_name; |
061ca8a3 KW |
332 | int coroutine_fn (*bdrv_co_truncate)(BlockDriverState *bs, int64_t offset, |
333 | PreallocMode prealloc, Error **errp); | |
b94a2610 | 334 | |
83f64091 | 335 | int64_t (*bdrv_getlength)(BlockDriverState *bs); |
b94a2610 | 336 | bool has_variable_length; |
4a1d5e1f | 337 | int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); |
90880ff1 SH |
338 | BlockMeasureInfo *(*bdrv_measure)(QemuOpts *opts, BlockDriverState *in_bs, |
339 | Error **errp); | |
b94a2610 | 340 | |
29a298af PB |
341 | int coroutine_fn (*bdrv_co_pwritev_compressed)(BlockDriverState *bs, |
342 | uint64_t offset, uint64_t bytes, QEMUIOVector *qiov); | |
343 | ||
5fafdf24 | 344 | int (*bdrv_snapshot_create)(BlockDriverState *bs, |
faea38e7 | 345 | QEMUSnapshotInfo *sn_info); |
5fafdf24 | 346 | int (*bdrv_snapshot_goto)(BlockDriverState *bs, |
faea38e7 | 347 | const char *snapshot_id); |
a89d89d3 WX |
348 | int (*bdrv_snapshot_delete)(BlockDriverState *bs, |
349 | const char *snapshot_id, | |
350 | const char *name, | |
351 | Error **errp); | |
5fafdf24 | 352 | int (*bdrv_snapshot_list)(BlockDriverState *bs, |
faea38e7 | 353 | QEMUSnapshotInfo **psn_info); |
51ef6727 | 354 | int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, |
7b4c4781 WX |
355 | const char *snapshot_id, |
356 | const char *name, | |
357 | Error **errp); | |
faea38e7 | 358 | int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); |
1bf6e9ca AS |
359 | ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs, |
360 | Error **errp); | |
83f64091 | 361 | |
1a8ae822 KW |
362 | int coroutine_fn (*bdrv_save_vmstate)(BlockDriverState *bs, |
363 | QEMUIOVector *qiov, | |
364 | int64_t pos); | |
365 | int coroutine_fn (*bdrv_load_vmstate)(BlockDriverState *bs, | |
366 | QEMUIOVector *qiov, | |
367 | int64_t pos); | |
178e08a5 | 368 | |
756e6736 KW |
369 | int (*bdrv_change_backing_file)(BlockDriverState *bs, |
370 | const char *backing_file, const char *backing_fmt); | |
371 | ||
19cb3738 | 372 | /* removable device specific */ |
e031f750 | 373 | bool (*bdrv_is_inserted)(BlockDriverState *bs); |
f36f3949 | 374 | void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); |
025e849a | 375 | void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); |
3b46e624 | 376 | |
985a03b0 | 377 | /* to control generic scsi devices */ |
7c84b1b8 | 378 | BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, |
221f715d | 379 | unsigned long int req, void *buf, |
097310b5 | 380 | BlockCompletionFunc *cb, void *opaque); |
16a389dc KW |
381 | int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs, |
382 | unsigned long int req, void *buf); | |
985a03b0 | 383 | |
0e7e1989 | 384 | /* List of options for creating images, terminated by name == NULL */ |
83d0521a | 385 | QemuOptsList *create_opts; |
8a2ce0bc AG |
386 | /* |
387 | * If this driver supports reopening images this contains a | |
388 | * NULL-terminated list of the runtime options that can be | |
389 | * modified. If an option in this list is unspecified during | |
390 | * reopen then it _must_ be reset to its default value or return | |
391 | * an error. | |
392 | */ | |
393 | const char *const *mutable_opts; | |
5eb45639 | 394 | |
9ac228e0 KW |
395 | /* |
396 | * Returns 0 for completed check, -errno for internal errors. | |
397 | * The check results are stored in result. | |
398 | */ | |
2fd61638 PB |
399 | int coroutine_fn (*bdrv_co_check)(BlockDriverState *bs, |
400 | BdrvCheckResult *result, | |
401 | BdrvCheckMode fix); | |
e97fc193 | 402 | |
77485434 | 403 | int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, |
8b13976d | 404 | BlockDriverAmendStatusCB *status_cb, |
d1402b50 HR |
405 | void *cb_opaque, |
406 | Error **errp); | |
6f176b48 | 407 | |
a31939e6 | 408 | void (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event); |
8b9b0cc2 | 409 | |
41c695c7 KW |
410 | /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ |
411 | int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, | |
412 | const char *tag); | |
4cc70e93 FZ |
413 | int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs, |
414 | const char *tag); | |
41c695c7 KW |
415 | int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); |
416 | bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); | |
417 | ||
3baca891 | 418 | void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp); |
d34682cd | 419 | |
336c1c12 KW |
420 | /* |
421 | * Returns 1 if newly created images are guaranteed to contain only | |
422 | * zeros, 0 otherwise. | |
423 | */ | |
424 | int (*bdrv_has_zero_init)(BlockDriverState *bs); | |
12c09b8c | 425 | |
dcd04228 SH |
426 | /* Remove fd handlers, timers, and other event loop callbacks so the event |
427 | * loop is no longer in use. Called with no in-flight requests and in | |
428 | * depth-first traversal order with parents before child nodes. | |
429 | */ | |
430 | void (*bdrv_detach_aio_context)(BlockDriverState *bs); | |
431 | ||
432 | /* Add fd handlers, timers, and other event loop callbacks so I/O requests | |
433 | * can be processed again. Called with no in-flight requests and in | |
434 | * depth-first traversal order with child nodes before parent nodes. | |
435 | */ | |
436 | void (*bdrv_attach_aio_context)(BlockDriverState *bs, | |
437 | AioContext *new_context); | |
438 | ||
448ad91d ML |
439 | /* io queue for linux-aio */ |
440 | void (*bdrv_io_plug)(BlockDriverState *bs); | |
441 | void (*bdrv_io_unplug)(BlockDriverState *bs); | |
448ad91d | 442 | |
892b7de8 ET |
443 | /** |
444 | * Try to get @bs's logical and physical block size. | |
445 | * On success, store them in @bsz and return zero. | |
446 | * On failure, return negative errno. | |
447 | */ | |
448 | int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz); | |
449 | /** | |
450 | * Try to get @bs's geometry (cyls, heads, sectors) | |
451 | * On success, store them in @geo and return 0. | |
452 | * On failure return -errno. | |
453 | * Only drivers that want to override guest geometry implement this | |
454 | * callback; see hd_geometry_guess(). | |
455 | */ | |
456 | int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo); | |
457 | ||
67da1dc5 | 458 | /** |
f8ea8dac | 459 | * bdrv_co_drain_begin is called if implemented in the beginning of a |
481cad48 MP |
460 | * drain operation to drain and stop any internal sources of requests in |
461 | * the driver. | |
462 | * bdrv_co_drain_end is called if implemented at the end of the drain. | |
463 | * | |
464 | * They should be used by the driver to e.g. manage scheduled I/O | |
465 | * requests, or toggle an internal state. After the end of the drain new | |
466 | * requests will continue normally. | |
67da1dc5 | 467 | */ |
f8ea8dac | 468 | void coroutine_fn (*bdrv_co_drain_begin)(BlockDriverState *bs); |
481cad48 | 469 | void coroutine_fn (*bdrv_co_drain_end)(BlockDriverState *bs); |
67da1dc5 | 470 | |
e06018ad WC |
471 | void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child, |
472 | Error **errp); | |
473 | void (*bdrv_del_child)(BlockDriverState *parent, BdrvChild *child, | |
474 | Error **errp); | |
475 | ||
33a610c3 KW |
476 | /** |
477 | * Informs the block driver that a permission change is intended. The | |
478 | * driver checks whether the change is permissible and may take other | |
479 | * preparations for the change (e.g. get file system locks). This operation | |
480 | * is always followed either by a call to either .bdrv_set_perm or | |
481 | * .bdrv_abort_perm_update. | |
482 | * | |
483 | * Checks whether the requested set of cumulative permissions in @perm | |
484 | * can be granted for accessing @bs and whether no other users are using | |
485 | * permissions other than those given in @shared (both arguments take | |
486 | * BLK_PERM_* bitmasks). | |
487 | * | |
488 | * If both conditions are met, 0 is returned. Otherwise, -errno is returned | |
489 | * and errp is set to an error describing the conflict. | |
490 | */ | |
491 | int (*bdrv_check_perm)(BlockDriverState *bs, uint64_t perm, | |
492 | uint64_t shared, Error **errp); | |
493 | ||
494 | /** | |
495 | * Called to inform the driver that the set of cumulative set of used | |
496 | * permissions for @bs has changed to @perm, and the set of sharable | |
497 | * permission to @shared. The driver can use this to propagate changes to | |
498 | * its children (i.e. request permissions only if a parent actually needs | |
499 | * them). | |
500 | * | |
501 | * This function is only invoked after bdrv_check_perm(), so block drivers | |
502 | * may rely on preparations made in their .bdrv_check_perm implementation. | |
503 | */ | |
504 | void (*bdrv_set_perm)(BlockDriverState *bs, uint64_t perm, uint64_t shared); | |
505 | ||
506 | /* | |
507 | * Called to inform the driver that after a previous bdrv_check_perm() | |
508 | * call, the permission update is not performed and any preparations made | |
509 | * for it (e.g. taken file locks) need to be undone. | |
510 | * | |
511 | * This function can be called even for nodes that never saw a | |
512 | * bdrv_check_perm() call. It is a no-op then. | |
513 | */ | |
514 | void (*bdrv_abort_perm_update)(BlockDriverState *bs); | |
515 | ||
516 | /** | |
517 | * Returns in @nperm and @nshared the permissions that the driver for @bs | |
518 | * needs on its child @c, based on the cumulative permissions requested by | |
519 | * the parents in @parent_perm and @parent_shared. | |
520 | * | |
521 | * If @c is NULL, return the permissions for attaching a new child for the | |
522 | * given @role. | |
e0995dc3 KW |
523 | * |
524 | * If @reopen_queue is non-NULL, don't return the currently needed | |
525 | * permissions, but those that will be needed after applying the | |
526 | * @reopen_queue. | |
33a610c3 KW |
527 | */ |
528 | void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c, | |
529 | const BdrvChildRole *role, | |
e0995dc3 | 530 | BlockReopenQueue *reopen_queue, |
33a610c3 KW |
531 | uint64_t parent_perm, uint64_t parent_shared, |
532 | uint64_t *nperm, uint64_t *nshared); | |
533 | ||
cb9ff6c2 VSO |
534 | /** |
535 | * Bitmaps should be marked as 'IN_USE' in the image on reopening image | |
536 | * as rw. This handler should realize it. It also should unset readonly | |
537 | * field of BlockDirtyBitmap's in case of success. | |
538 | */ | |
539 | int (*bdrv_reopen_bitmaps_rw)(BlockDriverState *bs, Error **errp); | |
67b792f5 VSO |
540 | bool (*bdrv_can_store_new_dirty_bitmap)(BlockDriverState *bs, |
541 | const char *name, | |
542 | uint32_t granularity, | |
543 | Error **errp); | |
56f364e6 VSO |
544 | void (*bdrv_remove_persistent_dirty_bitmap)(BlockDriverState *bs, |
545 | const char *name, | |
546 | Error **errp); | |
cb9ff6c2 | 547 | |
23d0ba93 FZ |
548 | /** |
549 | * Register/unregister a buffer for I/O. For example, when the driver is | |
550 | * interested to know the memory areas that will later be used in iovs, so | |
551 | * that it can do IOMMU mapping with VFIO etc., in order to get better | |
552 | * performance. In the case of VFIO drivers, this callback is used to do | |
553 | * DMA mapping for hot buffers. | |
554 | */ | |
555 | void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size); | |
556 | void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host); | |
8a22f02a | 557 | QLIST_ENTRY(BlockDriver) list; |
2654267c HR |
558 | |
559 | /* Pointer to a NULL-terminated array of names of strong options | |
560 | * that can be specified for bdrv_open(). A strong option is one | |
561 | * that changes the data of a BDS. | |
562 | * If this pointer is NULL, the array is considered empty. | |
563 | * "filename" and "driver" are always considered strong. */ | |
564 | const char *const *strong_runtime_opts; | |
ea2384d3 FB |
565 | }; |
566 | ||
fe81c2cc | 567 | typedef struct BlockLimits { |
a5b8dd2c EB |
568 | /* Alignment requirement, in bytes, for offset/length of I/O |
569 | * requests. Must be a power of 2 less than INT_MAX; defaults to | |
570 | * 1 for drivers with modern byte interfaces, and to 512 | |
571 | * otherwise. */ | |
572 | uint32_t request_alignment; | |
573 | ||
b8d0a980 EB |
574 | /* Maximum number of bytes that can be discarded at once (since it |
575 | * is signed, it must be < 2G, if set). Must be multiple of | |
b9f7855a EB |
576 | * pdiscard_alignment, but need not be power of 2. May be 0 if no |
577 | * inherent 32-bit limit */ | |
578 | int32_t max_pdiscard; | |
579 | ||
b8d0a980 EB |
580 | /* Optimal alignment for discard requests in bytes. A power of 2 |
581 | * is best but not mandatory. Must be a multiple of | |
582 | * bl.request_alignment, and must be less than max_pdiscard if | |
583 | * that is set. May be 0 if bl.request_alignment is good enough */ | |
b9f7855a | 584 | uint32_t pdiscard_alignment; |
fe81c2cc | 585 | |
b8d0a980 EB |
586 | /* Maximum number of bytes that can zeroized at once (since it is |
587 | * signed, it must be < 2G, if set). Must be multiple of | |
29cc6a68 | 588 | * pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */ |
cf081fca | 589 | int32_t max_pwrite_zeroes; |
fe81c2cc | 590 | |
b8d0a980 EB |
591 | /* Optimal alignment for write zeroes requests in bytes. A power |
592 | * of 2 is best but not mandatory. Must be a multiple of | |
593 | * bl.request_alignment, and must be less than max_pwrite_zeroes | |
594 | * if that is set. May be 0 if bl.request_alignment is good | |
595 | * enough */ | |
cf081fca | 596 | uint32_t pwrite_zeroes_alignment; |
7337acaf | 597 | |
b8d0a980 EB |
598 | /* Optimal transfer length in bytes. A power of 2 is best but not |
599 | * mandatory. Must be a multiple of bl.request_alignment, or 0 if | |
600 | * no preferred size */ | |
5def6b80 EB |
601 | uint32_t opt_transfer; |
602 | ||
b8d0a980 EB |
603 | /* Maximal transfer length in bytes. Need not be power of 2, but |
604 | * must be multiple of opt_transfer and bl.request_alignment, or 0 | |
605 | * for no 32-bit limit. For now, anything larger than INT_MAX is | |
606 | * clamped down. */ | |
5def6b80 | 607 | uint32_t max_transfer; |
2647fab5 | 608 | |
a5b8dd2c | 609 | /* memory alignment, in bytes so that no bounce buffer is needed */ |
4196d2f0 DL |
610 | size_t min_mem_alignment; |
611 | ||
a5b8dd2c | 612 | /* memory alignment, in bytes, for bounce buffer */ |
339064d5 | 613 | size_t opt_mem_alignment; |
bd44feb7 SH |
614 | |
615 | /* maximum number of iovec elements */ | |
616 | int max_iov; | |
fe81c2cc PL |
617 | } BlockLimits; |
618 | ||
fbe40ff7 FZ |
619 | typedef struct BdrvOpBlocker BdrvOpBlocker; |
620 | ||
33384421 HR |
621 | typedef struct BdrvAioNotifier { |
622 | void (*attached_aio_context)(AioContext *new_context, void *opaque); | |
623 | void (*detach_aio_context)(void *opaque); | |
624 | ||
625 | void *opaque; | |
e8a095da | 626 | bool deleted; |
33384421 HR |
627 | |
628 | QLIST_ENTRY(BdrvAioNotifier) list; | |
629 | } BdrvAioNotifier; | |
630 | ||
f3930ed0 | 631 | struct BdrvChildRole { |
5fe31c25 KW |
632 | /* If true, bdrv_replace_node() doesn't change the node this BdrvChild |
633 | * points to. */ | |
26de9438 KW |
634 | bool stay_at_node; |
635 | ||
6cd5c9d7 KW |
636 | /* If true, the parent is a BlockDriverState and bdrv_next_all_states() |
637 | * will return it. This information is used for drain_all, where every node | |
638 | * will be drained separately, so the drain only needs to be propagated to | |
639 | * non-BDS parents. */ | |
640 | bool parent_is_bds; | |
641 | ||
8e2160e2 KW |
642 | void (*inherit_options)(int *child_flags, QDict *child_options, |
643 | int parent_flags, QDict *parent_options); | |
c2066af0 | 644 | |
5c8cab48 KW |
645 | void (*change_media)(BdrvChild *child, bool load); |
646 | void (*resize)(BdrvChild *child); | |
647 | ||
4c265bf9 KW |
648 | /* Returns a name that is supposedly more useful for human users than the |
649 | * node name for identifying the node in question (in particular, a BB | |
650 | * name), or NULL if the parent can't provide a better name. */ | |
d4a7f45e | 651 | const char *(*get_name)(BdrvChild *child); |
4c265bf9 | 652 | |
b5411555 KW |
653 | /* Returns a malloced string that describes the parent of the child for a |
654 | * human reader. This could be a node-name, BlockBackend name, qdev ID or | |
655 | * QOM path of the device owning the BlockBackend, job type and ID etc. The | |
656 | * caller is responsible for freeing the memory. */ | |
d4a7f45e | 657 | char *(*get_parent_desc)(BdrvChild *child); |
b5411555 | 658 | |
c2066af0 KW |
659 | /* |
660 | * If this pair of functions is implemented, the parent doesn't issue new | |
661 | * requests after returning from .drained_begin() until .drained_end() is | |
662 | * called. | |
663 | * | |
4be6a6d1 KW |
664 | * These functions must not change the graph (and therefore also must not |
665 | * call aio_poll(), which could change the graph indirectly). | |
666 | * | |
c2066af0 KW |
667 | * Note that this can be nested. If drained_begin() was called twice, new |
668 | * I/O is allowed only after drained_end() was called twice, too. | |
669 | */ | |
670 | void (*drained_begin)(BdrvChild *child); | |
671 | void (*drained_end)(BdrvChild *child); | |
db95dbba | 672 | |
89bd0305 KW |
673 | /* |
674 | * Returns whether the parent has pending requests for the child. This | |
675 | * callback is polled after .drained_begin() has been called until all | |
676 | * activity on the child has stopped. | |
677 | */ | |
678 | bool (*drained_poll)(BdrvChild *child); | |
679 | ||
cfa1a572 KW |
680 | /* Notifies the parent that the child has been activated/inactivated (e.g. |
681 | * when migration is completing) and it can start/stop requesting | |
682 | * permissions and doing I/O on it. */ | |
4417ab7a | 683 | void (*activate)(BdrvChild *child, Error **errp); |
cfa1a572 | 684 | int (*inactivate)(BdrvChild *child); |
4417ab7a | 685 | |
db95dbba KW |
686 | void (*attach)(BdrvChild *child); |
687 | void (*detach)(BdrvChild *child); | |
6858eba0 KW |
688 | |
689 | /* Notifies the parent that the filename of its child has changed (e.g. | |
690 | * because the direct child was removed from the backing chain), so that it | |
691 | * can update its reference. */ | |
692 | int (*update_filename)(BdrvChild *child, BlockDriverState *new_base, | |
693 | const char *filename, Error **errp); | |
5d231849 KW |
694 | |
695 | bool (*can_set_aio_ctx)(BdrvChild *child, AioContext *ctx, | |
696 | GSList **ignore, Error **errp); | |
f3930ed0 KW |
697 | }; |
698 | ||
699 | extern const BdrvChildRole child_file; | |
700 | extern const BdrvChildRole child_format; | |
91ef3825 | 701 | extern const BdrvChildRole child_backing; |
f3930ed0 | 702 | |
b4b059f6 | 703 | struct BdrvChild { |
6e93e7c4 | 704 | BlockDriverState *bs; |
260fecf1 | 705 | char *name; |
6e93e7c4 | 706 | const BdrvChildRole *role; |
22aa8b24 | 707 | void *opaque; |
d5e6f437 KW |
708 | |
709 | /** | |
710 | * Granted permissions for operating on this BdrvChild (BLK_PERM_* bitmask) | |
711 | */ | |
712 | uint64_t perm; | |
713 | ||
714 | /** | |
715 | * Permissions that can still be granted to other users of @bs while this | |
716 | * BdrvChild is still attached to it. (BLK_PERM_* bitmask) | |
717 | */ | |
718 | uint64_t shared_perm; | |
719 | ||
f962e961 VSO |
720 | /* backup of permissions during permission update procedure */ |
721 | bool has_backup_perm; | |
722 | uint64_t backup_perm; | |
723 | uint64_t backup_shared_perm; | |
724 | ||
2cad1ebe AG |
725 | /* |
726 | * This link is frozen: the child can neither be replaced nor | |
727 | * detached from the parent. | |
728 | */ | |
729 | bool frozen; | |
730 | ||
6e93e7c4 | 731 | QLIST_ENTRY(BdrvChild) next; |
d42a8a93 | 732 | QLIST_ENTRY(BdrvChild) next_parent; |
b4b059f6 | 733 | }; |
6e93e7c4 | 734 | |
8802d1fd JC |
735 | /* |
736 | * Note: the function bdrv_append() copies and swaps contents of | |
737 | * BlockDriverStates, so if you add new fields to this struct, please | |
738 | * inspect bdrv_append() to determine if the new fields need to be | |
739 | * copied as well. | |
740 | */ | |
ea2384d3 | 741 | struct BlockDriverState { |
91bcea48 PB |
742 | /* Protected by big QEMU lock or read-only after opening. No special |
743 | * locking needed during I/O... | |
744 | */ | |
4dca4b63 | 745 | int open_flags; /* flags used to open the file, re-used for re-open */ |
54115412 EB |
746 | bool read_only; /* if true, the media is read only */ |
747 | bool encrypted; /* if true, the media is encrypted */ | |
54115412 EB |
748 | bool sg; /* if true, the device is a /dev/sg* */ |
749 | bool probed; /* if true, format was probed rather than specified */ | |
5a9347c6 | 750 | bool force_share; /* if true, always allow all shared permissions */ |
d3c8c674 | 751 | bool implicit; /* if true, this filter node was automatically inserted */ |
54115412 | 752 | |
19cb3738 | 753 | BlockDriver *drv; /* NULL means no media */ |
ea2384d3 FB |
754 | void *opaque; |
755 | ||
dcd04228 | 756 | AioContext *aio_context; /* event loop used for fd handlers, timers, etc */ |
33384421 HR |
757 | /* long-running tasks intended to always use the same AioContext as this |
758 | * BDS may register themselves in this list to be notified of changes | |
759 | * regarding this BDS's context */ | |
760 | QLIST_HEAD(, BdrvAioNotifier) aio_notifiers; | |
e8a095da | 761 | bool walking_aio_notifiers; /* to make removal during iteration safe */ |
dcd04228 | 762 | |
9a29e18f JC |
763 | char filename[PATH_MAX]; |
764 | char backing_file[PATH_MAX]; /* if non zero, the image is a diff of | |
765 | this file image */ | |
998c2019 HR |
766 | /* The backing filename indicated by the image header; if we ever |
767 | * open this file, then this is replaced by the resulting BDS's | |
768 | * filename (i.e. after a bdrv_refresh_filename() run). */ | |
769 | char auto_backing_file[PATH_MAX]; | |
5eb45639 | 770 | char backing_format[16]; /* if non-zero and backing_file exists */ |
19cb3738 | 771 | |
91af7014 | 772 | QDict *full_open_options; |
9a29e18f | 773 | char exact_filename[PATH_MAX]; |
91af7014 | 774 | |
760e0063 | 775 | BdrvChild *backing; |
9a4f4c31 | 776 | BdrvChild *file; |
66f82cee | 777 | |
fe81c2cc PL |
778 | /* I/O Limits */ |
779 | BlockLimits bl; | |
780 | ||
c1e3489d HR |
781 | /* Flags honored during pwrite (so far: BDRV_REQ_FUA, |
782 | * BDRV_REQ_WRITE_UNCHANGED). | |
783 | * If a driver does not support BDRV_REQ_WRITE_UNCHANGED, those | |
784 | * writes will be issued as normal writes without the flag set. | |
785 | * This is important to note for drivers that do not explicitly | |
786 | * request a WRITE permission for their children and instead take | |
787 | * the same permissions as their parent did (this is commonly what | |
788 | * block filters do). Such drivers have to be aware that the | |
789 | * parent may have taken a WRITE_UNCHANGED permission only and is | |
790 | * issuing such requests. Drivers either must make sure that | |
791 | * these requests do not result in plain WRITE accesses (usually | |
792 | * by supporting BDRV_REQ_WRITE_UNCHANGED, and then forwarding | |
793 | * every incoming write request as-is, including potentially that | |
794 | * flag), or they have to explicitly take the WRITE permission for | |
795 | * their children. */ | |
4df863f3 | 796 | unsigned int supported_write_flags; |
d05aa8bb | 797 | /* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA, |
c1e3489d | 798 | * BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */ |
465fe887 | 799 | unsigned int supported_zero_flags; |
c25f53b0 | 800 | |
dc364f4c BC |
801 | /* the following member gives a name to every node on the bs graph. */ |
802 | char node_name[32]; | |
803 | /* element of the list of named nodes building the graph */ | |
804 | QTAILQ_ENTRY(BlockDriverState) node_list; | |
2c1d04e0 HR |
805 | /* element of the list of all BlockDriverStates (all_bdrv_states) */ |
806 | QTAILQ_ENTRY(BlockDriverState) bs_list; | |
9c4218e9 HR |
807 | /* element of the list of monitor-owned BDS */ |
808 | QTAILQ_ENTRY(BlockDriverState) monitor_list; | |
9fcb0251 | 809 | int refcnt; |
dbffbdcf | 810 | |
fbe40ff7 FZ |
811 | /* operation blockers */ |
812 | QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX]; | |
813 | ||
eeec61f2 SH |
814 | /* long-running background operation */ |
815 | BlockJob *job; | |
e971aa12 | 816 | |
bddcec37 KW |
817 | /* The node that this node inherited default options from (and a reopen on |
818 | * which can affect this node by changing these defaults). This is always a | |
819 | * parent node of this node. */ | |
820 | BlockDriverState *inherits_from; | |
6e93e7c4 | 821 | QLIST_HEAD(, BdrvChild) children; |
d42a8a93 | 822 | QLIST_HEAD(, BdrvChild) parents; |
6e93e7c4 | 823 | |
de9c0cec | 824 | QDict *options; |
145f598e | 825 | QDict *explicit_options; |
465bee1d | 826 | BlockdevDetectZeroesOptions detect_zeroes; |
826b6ca0 FZ |
827 | |
828 | /* The error object in use for blocking operations on backing_hd */ | |
829 | Error *backing_blocker; | |
e2462113 | 830 | |
91bcea48 PB |
831 | /* Protected by AioContext lock */ |
832 | ||
91bcea48 | 833 | /* If we are reading a disk image, give its size in sectors. |
5e22479a JQ |
834 | * Generally read-only; it is written to by load_snapshot and |
835 | * save_snaphost, but the block layer is quiescent during those. | |
91bcea48 PB |
836 | */ |
837 | int64_t total_sectors; | |
838 | ||
839 | /* Callback before write request is processed */ | |
840 | NotifierWithReturnList before_write_notifiers; | |
841 | ||
e2462113 FR |
842 | /* threshold limit for writes, in bytes. "High water mark". */ |
843 | uint64_t write_threshold_offset; | |
844 | NotifierWithReturn write_threshold_notifier; | |
51288d79 | 845 | |
2119882c PB |
846 | /* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex. |
847 | * Reading from the list can be done with either the BQL or the | |
b64bd51e PB |
848 | * dirty_bitmap_mutex. Modifying a bitmap only requires |
849 | * dirty_bitmap_mutex. */ | |
2119882c | 850 | QemuMutex dirty_bitmap_mutex; |
91bcea48 PB |
851 | QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; |
852 | ||
f7946da2 PB |
853 | /* Offset after the highest byte written to */ |
854 | Stat64 wr_highest_offset; | |
855 | ||
d3faa13e PB |
856 | /* If true, copy read backing sectors into image. Can be >1 if more |
857 | * than one client has requested copy-on-read. Accessed with atomic | |
858 | * ops. | |
859 | */ | |
860 | int copy_on_read; | |
861 | ||
20fc71b2 PB |
862 | /* number of in-flight requests; overall and serialising. |
863 | * Accessed with atomic ops. | |
864 | */ | |
865 | unsigned int in_flight; | |
866 | unsigned int serialising_in_flight; | |
867 | ||
850d54a2 PB |
868 | /* counter for nested bdrv_io_plug. |
869 | * Accessed with atomic ops. | |
870 | */ | |
871 | unsigned io_plugged; | |
872 | ||
91bcea48 PB |
873 | /* do we need to tell the quest if we have a volatile write cache? */ |
874 | int enable_write_cache; | |
875 | ||
414c2ec3 | 876 | /* Accessed with atomic ops. */ |
51288d79 | 877 | int quiesce_counter; |
d736f119 KW |
878 | int recursive_quiesce_counter; |
879 | ||
47fec599 | 880 | unsigned int write_gen; /* Current data generation */ |
3783fa3d PB |
881 | |
882 | /* Protected by reqs_lock. */ | |
883 | CoMutex reqs_lock; | |
884 | QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; | |
885 | CoQueue flush_queue; /* Serializing flush queue */ | |
886 | bool active_flush_req; /* Flush request in flight? */ | |
887 | ||
888 | /* Only read/written by whoever has set active_flush_req to true. */ | |
889 | unsigned int flushed_gen; /* Flushed write generation */ | |
ea2384d3 FB |
890 | }; |
891 | ||
281d22d8 HR |
892 | struct BlockBackendRootState { |
893 | int open_flags; | |
894 | bool read_only; | |
895 | BlockdevDetectZeroesOptions detect_zeroes; | |
281d22d8 HR |
896 | }; |
897 | ||
274fccee HR |
898 | typedef enum BlockMirrorBackingMode { |
899 | /* Reuse the existing backing chain from the source for the target. | |
900 | * - sync=full: Set backing BDS to NULL. | |
901 | * - sync=top: Use source's backing BDS. | |
902 | * - sync=none: Use source as the backing BDS. */ | |
903 | MIRROR_SOURCE_BACKING_CHAIN, | |
904 | ||
905 | /* Open the target's backing chain completely anew */ | |
906 | MIRROR_OPEN_BACKING_CHAIN, | |
907 | ||
908 | /* Do not change the target's backing BDS after job completion */ | |
909 | MIRROR_LEAVE_BACKING_CHAIN, | |
910 | } BlockMirrorBackingMode; | |
911 | ||
760e0063 KW |
912 | static inline BlockDriverState *backing_bs(BlockDriverState *bs) |
913 | { | |
914 | return bs->backing ? bs->backing->bs : NULL; | |
915 | } | |
916 | ||
5f535a94 HR |
917 | |
918 | /* Essential block drivers which must always be statically linked into qemu, and | |
919 | * which therefore can be accessed without using bdrv_find_format() */ | |
920 | extern BlockDriver bdrv_file; | |
921 | extern BlockDriver bdrv_raw; | |
922 | extern BlockDriver bdrv_qcow2; | |
923 | ||
a03ef88f | 924 | int coroutine_fn bdrv_co_preadv(BdrvChild *child, |
1bf1cbc9 KW |
925 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
926 | BdrvRequestFlags flags); | |
a03ef88f | 927 | int coroutine_fn bdrv_co_pwritev(BdrvChild *child, |
a8823a3b KW |
928 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
929 | BdrvRequestFlags flags); | |
1bf1cbc9 | 930 | |
371420e2 VSO |
931 | static inline int coroutine_fn bdrv_co_pread(BdrvChild *child, |
932 | int64_t offset, unsigned int bytes, void *buf, BdrvRequestFlags flags) | |
933 | { | |
934 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
935 | ||
936 | return bdrv_co_preadv(child, offset, bytes, &qiov, flags); | |
937 | } | |
938 | ||
939 | static inline int coroutine_fn bdrv_co_pwrite(BdrvChild *child, | |
940 | int64_t offset, unsigned int bytes, void *buf, BdrvRequestFlags flags) | |
941 | { | |
942 | QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes); | |
943 | ||
944 | return bdrv_co_pwritev(child, offset, bytes, &qiov, flags); | |
945 | } | |
946 | ||
0f12264e | 947 | extern unsigned int bdrv_drain_all_count; |
d736f119 KW |
948 | void bdrv_apply_subtree_drain(BdrvChild *child, BlockDriverState *new_parent); |
949 | void bdrv_unapply_subtree_drain(BdrvChild *child, BlockDriverState *old_parent); | |
950 | ||
eba25057 | 951 | int get_tmp_filename(char *filename, int size); |
38f3ef57 KW |
952 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
953 | const char *filename); | |
95389c86 | 954 | |
03c320d8 HR |
955 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, |
956 | QDict *options); | |
957 | ||
0563e191 | 958 | |
d616b224 SH |
959 | /** |
960 | * bdrv_add_before_write_notifier: | |
961 | * | |
962 | * Register a callback that is invoked before write requests are processed but | |
963 | * after any throttling or waiting for overlapping requests. | |
964 | */ | |
965 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
966 | NotifierWithReturn *notifier); | |
967 | ||
dcd04228 SH |
968 | /** |
969 | * bdrv_detach_aio_context: | |
970 | * | |
971 | * May be called from .bdrv_detach_aio_context() to detach children from the | |
972 | * current #AioContext. This is only needed by block drivers that manage their | |
760e0063 | 973 | * own children. Both ->file and ->backing are automatically handled and |
dcd04228 SH |
974 | * block drivers should not call this function on them explicitly. |
975 | */ | |
976 | void bdrv_detach_aio_context(BlockDriverState *bs); | |
977 | ||
978 | /** | |
979 | * bdrv_attach_aio_context: | |
980 | * | |
981 | * May be called from .bdrv_attach_aio_context() to attach children to the new | |
982 | * #AioContext. This is only needed by block drivers that manage their own | |
760e0063 | 983 | * children. Both ->file and ->backing are automatically handled and block |
dcd04228 SH |
984 | * drivers should not call this function on them explicitly. |
985 | */ | |
986 | void bdrv_attach_aio_context(BlockDriverState *bs, | |
987 | AioContext *new_context); | |
988 | ||
33384421 HR |
989 | /** |
990 | * bdrv_add_aio_context_notifier: | |
991 | * | |
992 | * If a long-running job intends to be always run in the same AioContext as a | |
993 | * certain BDS, it may use this function to be notified of changes regarding the | |
994 | * association of the BDS to an AioContext. | |
995 | * | |
996 | * attached_aio_context() is called after the target BDS has been attached to a | |
997 | * new AioContext; detach_aio_context() is called before the target BDS is being | |
998 | * detached from its old AioContext. | |
999 | */ | |
1000 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, | |
1001 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
1002 | void (*detach_aio_context)(void *opaque), void *opaque); | |
1003 | ||
1004 | /** | |
1005 | * bdrv_remove_aio_context_notifier: | |
1006 | * | |
1007 | * Unsubscribe of change notifications regarding the BDS's AioContext. The | |
1008 | * parameters given here have to be the same as those given to | |
1009 | * bdrv_add_aio_context_notifier(). | |
1010 | */ | |
1011 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, | |
1012 | void (*aio_context_attached)(AioContext *, | |
1013 | void *), | |
1014 | void (*aio_context_detached)(void *), | |
1015 | void *opaque); | |
1016 | ||
c9d1a561 PB |
1017 | /** |
1018 | * bdrv_wakeup: | |
1019 | * @bs: The BlockDriverState for which an I/O operation has been completed. | |
1020 | * | |
1021 | * Wake up the main thread if it is waiting on BDRV_POLL_WHILE. During | |
1022 | * synchronous I/O on a BlockDriverState that is attached to another | |
1023 | * I/O thread, the main thread lets the I/O thread's event loop run, | |
1024 | * waiting for the I/O operation to complete. A bdrv_wakeup will wake | |
1025 | * up the main thread if necessary. | |
1026 | * | |
1027 | * Manual calls to bdrv_wakeup are rarely necessary, because | |
1028 | * bdrv_dec_in_flight already calls it. | |
1029 | */ | |
1030 | void bdrv_wakeup(BlockDriverState *bs); | |
1031 | ||
508c7cb3 CH |
1032 | #ifdef _WIN32 |
1033 | int is_windows_drive(const char *filename); | |
1034 | #endif | |
1035 | ||
dc534f8f PB |
1036 | /** |
1037 | * stream_start: | |
2323322e AG |
1038 | * @job_id: The id of the newly-created job, or %NULL to use the |
1039 | * device name of @bs. | |
dc534f8f PB |
1040 | * @bs: Block device to operate on. |
1041 | * @base: Block device that will become the new base, or %NULL to | |
1042 | * flatten the whole backing file chain onto @bs. | |
29338003 AG |
1043 | * @backing_file_str: The file name that will be written to @bs as the |
1044 | * the new backing file if the job completes. Ignored if @base is %NULL. | |
cf6320df JS |
1045 | * @creation_flags: Flags that control the behavior of the Job lifetime. |
1046 | * See @BlockJobCreateFlags | |
c83c66c3 | 1047 | * @speed: The maximum speed, in bytes per second, or 0 for unlimited. |
1d809098 | 1048 | * @on_error: The action to take upon error. |
fd7f8c65 | 1049 | * @errp: Error object. |
dc534f8f PB |
1050 | * |
1051 | * Start a streaming operation on @bs. Clusters that are unallocated | |
1052 | * in @bs, but allocated in any image between @base and @bs (both | |
1053 | * exclusive) will be written to @bs. At the end of a successful | |
1054 | * streaming job, the backing file of @bs will be changed to | |
29338003 AG |
1055 | * @backing_file_str in the written image and to @base in the live |
1056 | * BlockDriverState. | |
dc534f8f | 1057 | */ |
2323322e AG |
1058 | void stream_start(const char *job_id, BlockDriverState *bs, |
1059 | BlockDriverState *base, const char *backing_file_str, | |
cf6320df JS |
1060 | int creation_flags, int64_t speed, |
1061 | BlockdevOnError on_error, Error **errp); | |
4f1043b4 | 1062 | |
747ff602 JC |
1063 | /** |
1064 | * commit_start: | |
fd62c609 AG |
1065 | * @job_id: The id of the newly-created job, or %NULL to use the |
1066 | * device name of @bs. | |
03544a6e FZ |
1067 | * @bs: Active block device. |
1068 | * @top: Top block device to be committed. | |
1069 | * @base: Block device that will be written into, and become the new top. | |
5360782d JS |
1070 | * @creation_flags: Flags that control the behavior of the Job lifetime. |
1071 | * See @BlockJobCreateFlags | |
747ff602 JC |
1072 | * @speed: The maximum speed, in bytes per second, or 0 for unlimited. |
1073 | * @on_error: The action to take upon error. | |
54e26900 | 1074 | * @backing_file_str: String to use as the backing file in @top's overlay |
0db832f4 KW |
1075 | * @filter_node_name: The node name that should be assigned to the filter |
1076 | * driver that the commit job inserts into the graph above @top. NULL means | |
1077 | * that a node name should be autogenerated. | |
747ff602 JC |
1078 | * @errp: Error object. |
1079 | * | |
1080 | */ | |
fd62c609 | 1081 | void commit_start(const char *job_id, BlockDriverState *bs, |
5360782d JS |
1082 | BlockDriverState *base, BlockDriverState *top, |
1083 | int creation_flags, int64_t speed, | |
8254b6d9 | 1084 | BlockdevOnError on_error, const char *backing_file_str, |
0db832f4 | 1085 | const char *filter_node_name, Error **errp); |
03544a6e FZ |
1086 | /** |
1087 | * commit_active_start: | |
fd62c609 AG |
1088 | * @job_id: The id of the newly-created job, or %NULL to use the |
1089 | * device name of @bs. | |
03544a6e FZ |
1090 | * @bs: Active block device to be committed. |
1091 | * @base: Block device that will be written into, and become the new top. | |
47970dfb JS |
1092 | * @creation_flags: Flags that control the behavior of the Job lifetime. |
1093 | * See @BlockJobCreateFlags | |
03544a6e FZ |
1094 | * @speed: The maximum speed, in bytes per second, or 0 for unlimited. |
1095 | * @on_error: The action to take upon error. | |
0db832f4 KW |
1096 | * @filter_node_name: The node name that should be assigned to the filter |
1097 | * driver that the commit job inserts into the graph above @bs. NULL means that | |
1098 | * a node name should be autogenerated. | |
03544a6e FZ |
1099 | * @cb: Completion function for the job. |
1100 | * @opaque: Opaque pointer value passed to @cb. | |
b49f7ead | 1101 | * @auto_complete: Auto complete the job. |
78bbd910 | 1102 | * @errp: Error object. |
03544a6e FZ |
1103 | * |
1104 | */ | |
fd62c609 | 1105 | void commit_active_start(const char *job_id, BlockDriverState *bs, |
47970dfb JS |
1106 | BlockDriverState *base, int creation_flags, |
1107 | int64_t speed, BlockdevOnError on_error, | |
0db832f4 | 1108 | const char *filter_node_name, |
78bbd910 FZ |
1109 | BlockCompletionFunc *cb, void *opaque, |
1110 | bool auto_complete, Error **errp); | |
893f7eba PB |
1111 | /* |
1112 | * mirror_start: | |
71aa9867 AG |
1113 | * @job_id: The id of the newly-created job, or %NULL to use the |
1114 | * device name of @bs. | |
893f7eba PB |
1115 | * @bs: Block device to operate on. |
1116 | * @target: Block device to write to. | |
09158f00 BC |
1117 | * @replaces: Block graph node name to replace once the mirror is done. Can |
1118 | * only be used when full mirroring is selected. | |
a1999b33 JS |
1119 | * @creation_flags: Flags that control the behavior of the Job lifetime. |
1120 | * See @BlockJobCreateFlags | |
893f7eba | 1121 | * @speed: The maximum speed, in bytes per second, or 0 for unlimited. |
eee13dfe | 1122 | * @granularity: The chosen granularity for the dirty bitmap. |
08e4ed6c | 1123 | * @buf_size: The amount of data that can be in flight at one time. |
893f7eba | 1124 | * @mode: Whether to collapse all images in the chain to the target. |
274fccee | 1125 | * @backing_mode: How to establish the target's backing chain after completion. |
b952b558 PB |
1126 | * @on_source_error: The action to take upon error reading from the source. |
1127 | * @on_target_error: The action to take upon error writing to the target. | |
0fc9f8ea | 1128 | * @unmap: Whether to unmap target where source sectors only contain zeroes. |
6cdbceb1 KW |
1129 | * @filter_node_name: The node name that should be assigned to the filter |
1130 | * driver that the mirror job inserts into the graph above @bs. NULL means that | |
1131 | * a node name should be autogenerated. | |
481debaa | 1132 | * @copy_mode: When to trigger writes to the target. |
893f7eba PB |
1133 | * @errp: Error object. |
1134 | * | |
1135 | * Start a mirroring operation on @bs. Clusters that are allocated | |
e7e4f9f9 | 1136 | * in @bs will be written to @target until the job is cancelled or |
893f7eba PB |
1137 | * manually completed. At the end of a successful mirroring job, |
1138 | * @bs will be switched to read from @target. | |
1139 | */ | |
71aa9867 AG |
1140 | void mirror_start(const char *job_id, BlockDriverState *bs, |
1141 | BlockDriverState *target, const char *replaces, | |
a1999b33 JS |
1142 | int creation_flags, int64_t speed, |
1143 | uint32_t granularity, int64_t buf_size, | |
274fccee HR |
1144 | MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, |
1145 | BlockdevOnError on_source_error, | |
b952b558 | 1146 | BlockdevOnError on_target_error, |
481debaa HR |
1147 | bool unmap, const char *filter_node_name, |
1148 | MirrorCopyMode copy_mode, Error **errp); | |
893f7eba | 1149 | |
98d2c6f2 | 1150 | /* |
111049a4 | 1151 | * backup_job_create: |
70559d49 AG |
1152 | * @job_id: The id of the newly-created job, or %NULL to use the |
1153 | * device name of @bs. | |
98d2c6f2 DM |
1154 | * @bs: Block device to operate on. |
1155 | * @target: Block device to write to. | |
1156 | * @speed: The maximum speed, in bytes per second, or 0 for unlimited. | |
fc5d3f84 | 1157 | * @sync_mode: What parts of the disk image should be copied to the destination. |
4b80ab2b | 1158 | * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL. |
98d2c6f2 DM |
1159 | * @on_source_error: The action to take upon error reading from the source. |
1160 | * @on_target_error: The action to take upon error writing to the target. | |
47970dfb JS |
1161 | * @creation_flags: Flags that control the behavior of the Job lifetime. |
1162 | * See @BlockJobCreateFlags | |
98d2c6f2 DM |
1163 | * @cb: Completion function for the job. |
1164 | * @opaque: Opaque pointer value passed to @cb. | |
78f51fde | 1165 | * @txn: Transaction that this job is part of (may be NULL). |
98d2c6f2 | 1166 | * |
111049a4 | 1167 | * Create a backup operation on @bs. Clusters in @bs are written to @target |
98d2c6f2 DM |
1168 | * until the job is cancelled or manually completed. |
1169 | */ | |
111049a4 JS |
1170 | BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, |
1171 | BlockDriverState *target, int64_t speed, | |
1172 | MirrorSyncMode sync_mode, | |
1173 | BdrvDirtyBitmap *sync_bitmap, | |
1174 | bool compress, | |
1175 | BlockdevOnError on_source_error, | |
1176 | BlockdevOnError on_target_error, | |
1177 | int creation_flags, | |
1178 | BlockCompletionFunc *cb, void *opaque, | |
62c9e416 | 1179 | JobTxn *txn, Error **errp); |
98d2c6f2 | 1180 | |
abb21ac3 KW |
1181 | void hmp_drive_add_node(Monitor *mon, const char *optstr); |
1182 | ||
f21d96d0 KW |
1183 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, |
1184 | const char *child_name, | |
36fe1331 | 1185 | const BdrvChildRole *child_role, |
d5e6f437 KW |
1186 | uint64_t perm, uint64_t shared_perm, |
1187 | void *opaque, Error **errp); | |
f21d96d0 KW |
1188 | void bdrv_root_unref_child(BdrvChild *child); |
1189 | ||
33a610c3 KW |
1190 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
1191 | Error **errp); | |
1192 | ||
6a1b9ee1 KW |
1193 | /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by |
1194 | * block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to | |
1195 | * all children */ | |
1196 | void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, | |
1197 | const BdrvChildRole *role, | |
e0995dc3 | 1198 | BlockReopenQueue *reopen_queue, |
6a1b9ee1 KW |
1199 | uint64_t perm, uint64_t shared, |
1200 | uint64_t *nperm, uint64_t *nshared); | |
1201 | ||
6b1a044a KW |
1202 | /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by |
1203 | * (non-raw) image formats: Like above for bs->backing, but for bs->file it | |
1204 | * requires WRITE | RESIZE for read-write images, always requires | |
1205 | * CONSISTENT_READ and doesn't share WRITE. */ | |
1206 | void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, | |
1207 | const BdrvChildRole *role, | |
e0995dc3 | 1208 | BlockReopenQueue *reopen_queue, |
6b1a044a KW |
1209 | uint64_t perm, uint64_t shared, |
1210 | uint64_t *nperm, uint64_t *nshared); | |
33a610c3 | 1211 | |
f7cc69b3 | 1212 | /* |
3e4d0e72 | 1213 | * Default implementation for drivers to pass bdrv_co_block_status() to |
f7cc69b3 MP |
1214 | * their file. |
1215 | */ | |
3e4d0e72 EB |
1216 | int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs, |
1217 | bool want_zero, | |
1218 | int64_t offset, | |
1219 | int64_t bytes, | |
1220 | int64_t *pnum, | |
1221 | int64_t *map, | |
1222 | BlockDriverState **file); | |
f7cc69b3 | 1223 | /* |
3e4d0e72 | 1224 | * Default implementation for drivers to pass bdrv_co_block_status() to |
f7cc69b3 MP |
1225 | * their backing file. |
1226 | */ | |
3e4d0e72 EB |
1227 | int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs, |
1228 | bool want_zero, | |
1229 | int64_t offset, | |
1230 | int64_t bytes, | |
1231 | int64_t *pnum, | |
1232 | int64_t *map, | |
1233 | BlockDriverState **file); | |
1f0c461b | 1234 | const char *bdrv_get_parent_name(const BlockDriverState *bs); |
39829a01 | 1235 | void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp); |
a7f53e26 | 1236 | bool blk_dev_has_removable_media(BlockBackend *blk); |
8f3a73bc | 1237 | bool blk_dev_has_tray(BlockBackend *blk); |
a7f53e26 MA |
1238 | void blk_dev_eject_request(BlockBackend *blk, bool force); |
1239 | bool blk_dev_is_tray_open(BlockBackend *blk); | |
1240 | bool blk_dev_is_medium_locked(BlockBackend *blk); | |
a7f53e26 | 1241 | |
0fdf1a4f | 1242 | void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes); |
e0c47b6c | 1243 | |
df9a681d | 1244 | void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out); |
56bd6624 | 1245 | void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *backup); |
df9a681d | 1246 | |
99723548 PB |
1247 | void bdrv_inc_in_flight(BlockDriverState *bs); |
1248 | void bdrv_dec_in_flight(BlockDriverState *bs); | |
1249 | ||
9c4218e9 HR |
1250 | void blockdev_close_all_bdrv_states(void); |
1251 | ||
fcc67678 FZ |
1252 | int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, uint64_t src_offset, |
1253 | BdrvChild *dst, uint64_t dst_offset, | |
67b51fb9 VSO |
1254 | uint64_t bytes, |
1255 | BdrvRequestFlags read_flags, | |
1256 | BdrvRequestFlags write_flags); | |
fcc67678 FZ |
1257 | int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset, |
1258 | BdrvChild *dst, uint64_t dst_offset, | |
67b51fb9 VSO |
1259 | uint64_t bytes, |
1260 | BdrvRequestFlags read_flags, | |
1261 | BdrvRequestFlags write_flags); | |
fcc67678 | 1262 | |
3d9f2d2a KW |
1263 | int refresh_total_sectors(BlockDriverState *bs, int64_t hint); |
1264 | ||
ea2384d3 | 1265 | #endif /* BLOCK_INT_H */ |