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faf07963 PB |
1 | #ifndef BLOCK_H |
2 | #define BLOCK_H | |
3 | ||
737e150e | 4 | #include "block/aio.h" |
7719f3c9 | 5 | #include "block/aio-wait.h" |
daf015ef | 6 | #include "qemu/iov.h" |
10817bf0 | 7 | #include "qemu/coroutine.h" |
5366d0c8 | 8 | #include "block/accounting.h" |
ebab2259 | 9 | #include "block/dirty-bitmap.h" |
c87621ea | 10 | #include "block/blockjob.h" |
78f9dc85 | 11 | #include "qemu/hbitmap.h" |
a76bab49 | 12 | |
aaaa20b6 VSO |
13 | /* |
14 | * generated_co_wrapper | |
15 | * | |
16 | * Function specifier, which does nothing but mark functions to be | |
17 | * generated by scripts/block-coroutine-wrapper.py | |
18 | * | |
19 | * Read more in docs/devel/block-coroutine-wrapper.rst | |
20 | */ | |
21 | #define generated_co_wrapper | |
22 | ||
faf07963 | 23 | /* block.c */ |
faf07963 | 24 | typedef struct BlockDriver BlockDriver; |
b4b059f6 | 25 | typedef struct BdrvChild BdrvChild; |
bd86fb99 | 26 | typedef struct BdrvChildClass BdrvChildClass; |
faf07963 | 27 | |
faf07963 PB |
28 | typedef struct BlockDriverInfo { |
29 | /* in bytes, 0 if irrelevant */ | |
30 | int cluster_size; | |
31 | /* offset at which the VM state can be saved (0 if not possible) */ | |
32 | int64_t vm_state_offset; | |
64c79160 | 33 | bool is_dirty; |
85f49cad FZ |
34 | /* |
35 | * True if this block driver only supports compressed writes | |
36 | */ | |
37 | bool needs_compressed_writes; | |
faf07963 PB |
38 | } BlockDriverInfo; |
39 | ||
f8111c24 DXW |
40 | typedef struct BlockFragInfo { |
41 | uint64_t allocated_clusters; | |
42 | uint64_t total_clusters; | |
43 | uint64_t fragmented_clusters; | |
e6439d78 | 44 | uint64_t compressed_clusters; |
f8111c24 DXW |
45 | } BlockFragInfo; |
46 | ||
6faac15f | 47 | typedef enum { |
9568b511 WC |
48 | BDRV_REQ_COPY_ON_READ = 0x1, |
49 | BDRV_REQ_ZERO_WRITE = 0x2, | |
52ebcb26 KW |
50 | |
51 | /* | |
52 | * The BDRV_REQ_MAY_UNMAP flag is used in write_zeroes requests to indicate | |
53 | * that the block driver should unmap (discard) blocks if it is guaranteed | |
54 | * that the result will read back as zeroes. The flag is only passed to the | |
55 | * driver if the block device is opened with BDRV_O_UNMAP. | |
d32f35cb | 56 | */ |
9568b511 | 57 | BDRV_REQ_MAY_UNMAP = 0x4, |
999658a0 | 58 | |
bfd18d1e | 59 | BDRV_REQ_FUA = 0x10, |
29a298af | 60 | BDRV_REQ_WRITE_COMPRESSED = 0x20, |
fa166538 | 61 | |
c6035964 HR |
62 | /* Signifies that this write request will not change the visible disk |
63 | * content. */ | |
64 | BDRV_REQ_WRITE_UNCHANGED = 0x40, | |
65 | ||
2153994e | 66 | /* Forces request serialisation. Use only with write requests. */ |
09d2f948 VSO |
67 | BDRV_REQ_SERIALISING = 0x80, |
68 | ||
fe0480d6 KW |
69 | /* Execute the request only if the operation can be offloaded or otherwise |
70 | * be executed efficiently, but return an error instead of using a slow | |
71 | * fallback. */ | |
72 | BDRV_REQ_NO_FALLBACK = 0x100, | |
73 | ||
3299e5ec VSO |
74 | /* |
75 | * BDRV_REQ_PREFETCH may be used only together with BDRV_REQ_COPY_ON_READ | |
76 | * on read request and means that caller doesn't really need data to be | |
77 | * written to qiov parameter which may be NULL. | |
78 | */ | |
79 | BDRV_REQ_PREFETCH = 0x200, | |
d1a764d1 VSO |
80 | |
81 | /* | |
82 | * If we need to wait for other requests, just fail immediately. Used | |
83 | * only together with BDRV_REQ_SERIALISING. | |
84 | */ | |
85 | BDRV_REQ_NO_WAIT = 0x400, | |
86 | ||
fa166538 | 87 | /* Mask of valid flags */ |
d1a764d1 | 88 | BDRV_REQ_MASK = 0x7ff, |
6faac15f PL |
89 | } BdrvRequestFlags; |
90 | ||
892b7de8 ET |
91 | typedef struct BlockSizes { |
92 | uint32_t phys; | |
93 | uint32_t log; | |
94 | } BlockSizes; | |
95 | ||
96 | typedef struct HDGeometry { | |
97 | uint32_t heads; | |
98 | uint32_t sectors; | |
99 | uint32_t cylinders; | |
100 | } HDGeometry; | |
101 | ||
faf07963 | 102 | #define BDRV_O_RDWR 0x0002 |
55880601 | 103 | #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */ |
faf07963 | 104 | #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ |
8bfea15d | 105 | #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ |
9f7965c7 | 106 | #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ |
5c6c3a6c | 107 | #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ |
b783e409 | 108 | #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ |
016f5cf6 | 109 | #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ |
53fec9d3 | 110 | #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ |
04c01a5c | 111 | #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ |
058f8f16 | 112 | #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ |
be028adc | 113 | #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ |
9e8f1835 | 114 | #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ |
2e40134b HR |
115 | #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: |
116 | select an appropriate protocol driver, | |
117 | ignoring the format layer */ | |
abb06c5a | 118 | #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ |
e35bdc12 | 119 | #define BDRV_O_AUTO_RDONLY 0x20000 /* degrade to read-only if opening read-write fails */ |
4c34ee36 | 120 | #define BDRV_O_IO_URING 0x40000 /* use io_uring instead of the thread pool */ |
9f7965c7 | 121 | |
61de4c68 | 122 | #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) |
faf07963 | 123 | |
54861b92 KW |
124 | |
125 | /* Option names of options parsed by the block layer */ | |
126 | ||
127 | #define BDRV_OPT_CACHE_WB "cache.writeback" | |
128 | #define BDRV_OPT_CACHE_DIRECT "cache.direct" | |
129 | #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" | |
f87a0e29 | 130 | #define BDRV_OPT_READ_ONLY "read-only" |
e35bdc12 | 131 | #define BDRV_OPT_AUTO_READ_ONLY "auto-read-only" |
818584a4 | 132 | #define BDRV_OPT_DISCARD "discard" |
5a9347c6 | 133 | #define BDRV_OPT_FORCE_SHARE "force-share" |
54861b92 KW |
134 | |
135 | ||
6ea44308 | 136 | #define BDRV_SECTOR_BITS 9 |
c63782cb | 137 | #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) |
6ea44308 | 138 | |
f9919116 EB |
139 | #define BDRV_REQUEST_MAX_SECTORS MIN_CONST(SIZE_MAX >> BDRV_SECTOR_BITS, \ |
140 | INT_MAX >> BDRV_SECTOR_BITS) | |
48265250 | 141 | #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) |
75af1f34 | 142 | |
8b117001 VSO |
143 | /* |
144 | * We want allow aligning requests and disk length up to any 32bit alignment | |
145 | * and don't afraid of overflow. | |
146 | * To achieve it, and in the same time use some pretty number as maximum disk | |
147 | * size, let's define maximum "length" (a limit for any offset/bytes request and | |
148 | * for disk size) to be the greatest power of 2 less than INT64_MAX. | |
149 | */ | |
150 | #define BDRV_MAX_ALIGNMENT (1L << 30) | |
151 | #define BDRV_MAX_LENGTH (QEMU_ALIGN_DOWN(INT64_MAX, BDRV_MAX_ALIGNMENT)) | |
152 | ||
705be728 | 153 | /* |
237d78f8 | 154 | * Allocation status flags for bdrv_block_status() and friends. |
4c41cb49 EB |
155 | * |
156 | * Public flags: | |
157 | * BDRV_BLOCK_DATA: allocation for data at offset is tied to this layer | |
158 | * BDRV_BLOCK_ZERO: offset reads as zero | |
159 | * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data | |
e88ae226 | 160 | * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this |
86a3d5c6 EB |
161 | * layer rather than any backing, set by block layer |
162 | * BDRV_BLOCK_EOF: the returned pnum covers through end of file for this | |
163 | * layer, set by block layer | |
4333bb71 | 164 | * |
69f47505 | 165 | * Internal flags: |
d5254033 EB |
166 | * BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request |
167 | * that the block layer recompute the answer from the returned | |
168 | * BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID. | |
69f47505 VSO |
169 | * BDRV_BLOCK_RECURSE: request that the block layer will recursively search for |
170 | * zeroes in file child of current block node inside | |
171 | * returned region. Only valid together with both | |
172 | * BDRV_BLOCK_DATA and BDRV_BLOCK_OFFSET_VALID. Should not | |
173 | * appear with BDRV_BLOCK_ZERO. | |
4333bb71 | 174 | * |
86a3d5c6 EB |
175 | * If BDRV_BLOCK_OFFSET_VALID is set, the map parameter represents the |
176 | * host offset within the returned BDS that is allocated for the | |
177 | * corresponding raw guest data. However, whether that offset | |
178 | * actually contains data also depends on BDRV_BLOCK_DATA, as follows: | |
4333bb71 PB |
179 | * |
180 | * DATA ZERO OFFSET_VALID | |
4c41cb49 EB |
181 | * t t t sectors read as zero, returned file is zero at offset |
182 | * t f t sectors read as valid from file at offset | |
183 | * f t t sectors preallocated, read as zero, returned file not | |
4333bb71 PB |
184 | * necessarily zero at offset |
185 | * f f t sectors preallocated but read from backing_hd, | |
4c41cb49 | 186 | * returned file contains garbage at offset |
4333bb71 PB |
187 | * t t f sectors preallocated, read as zero, unknown offset |
188 | * t f f sectors read from unknown file or offset | |
189 | * f t f not allocated or unknown offset, read as zero | |
190 | * f f f not allocated or unknown offset, read from backing_hd | |
191 | */ | |
e88ae226 KW |
192 | #define BDRV_BLOCK_DATA 0x01 |
193 | #define BDRV_BLOCK_ZERO 0x02 | |
194 | #define BDRV_BLOCK_OFFSET_VALID 0x04 | |
195 | #define BDRV_BLOCK_RAW 0x08 | |
196 | #define BDRV_BLOCK_ALLOCATED 0x10 | |
fb0d8654 | 197 | #define BDRV_BLOCK_EOF 0x20 |
69f47505 | 198 | #define BDRV_BLOCK_RECURSE 0x40 |
4333bb71 | 199 | |
859443b0 | 200 | typedef QTAILQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; |
e971aa12 JC |
201 | |
202 | typedef struct BDRVReopenState { | |
203 | BlockDriverState *bs; | |
204 | int flags; | |
543770bd | 205 | BlockdevDetectZeroesOptions detect_zeroes; |
8546632e | 206 | bool backing_missing; |
cb828c31 AG |
207 | bool replace_backing_bs; /* new_backing_bs is ignored if this is false */ |
208 | BlockDriverState *new_backing_bs; /* If NULL then detach the current bs */ | |
30450259 | 209 | uint64_t perm, shared_perm; |
4d2cb092 | 210 | QDict *options; |
145f598e | 211 | QDict *explicit_options; |
e971aa12 JC |
212 | void *opaque; |
213 | } BDRVReopenState; | |
214 | ||
8574575f FZ |
215 | /* |
216 | * Block operation types | |
217 | */ | |
218 | typedef enum BlockOpType { | |
219 | BLOCK_OP_TYPE_BACKUP_SOURCE, | |
220 | BLOCK_OP_TYPE_BACKUP_TARGET, | |
221 | BLOCK_OP_TYPE_CHANGE, | |
bb00021d FZ |
222 | BLOCK_OP_TYPE_COMMIT_SOURCE, |
223 | BLOCK_OP_TYPE_COMMIT_TARGET, | |
8574575f FZ |
224 | BLOCK_OP_TYPE_DATAPLANE, |
225 | BLOCK_OP_TYPE_DRIVE_DEL, | |
226 | BLOCK_OP_TYPE_EJECT, | |
227 | BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, | |
228 | BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, | |
229 | BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, | |
05e4d14b | 230 | BLOCK_OP_TYPE_MIRROR_SOURCE, |
e40e5027 | 231 | BLOCK_OP_TYPE_MIRROR_TARGET, |
8574575f FZ |
232 | BLOCK_OP_TYPE_RESIZE, |
233 | BLOCK_OP_TYPE_STREAM, | |
09158f00 | 234 | BLOCK_OP_TYPE_REPLACE, |
8574575f FZ |
235 | BLOCK_OP_TYPE_MAX, |
236 | } BlockOpType; | |
e971aa12 | 237 | |
7006c9a7 KW |
238 | /* Block node permission constants */ |
239 | enum { | |
240 | /** | |
241 | * A user that has the "permission" of consistent reads is guaranteed that | |
242 | * their view of the contents of the block device is complete and | |
243 | * self-consistent, representing the contents of a disk at a specific | |
244 | * point. | |
245 | * | |
246 | * For most block devices (including their backing files) this is true, but | |
247 | * the property cannot be maintained in a few situations like for | |
248 | * intermediate nodes of a commit block job. | |
249 | */ | |
250 | BLK_PERM_CONSISTENT_READ = 0x01, | |
251 | ||
252 | /** This permission is required to change the visible disk contents. */ | |
253 | BLK_PERM_WRITE = 0x02, | |
254 | ||
255 | /** | |
256 | * This permission (which is weaker than BLK_PERM_WRITE) is both enough and | |
257 | * required for writes to the block node when the caller promises that | |
258 | * the visible disk content doesn't change. | |
24b7c538 HR |
259 | * |
260 | * As the BLK_PERM_WRITE permission is strictly stronger, either is | |
261 | * sufficient to perform an unchanging write. | |
7006c9a7 KW |
262 | */ |
263 | BLK_PERM_WRITE_UNCHANGED = 0x04, | |
264 | ||
265 | /** This permission is required to change the size of a block node. */ | |
266 | BLK_PERM_RESIZE = 0x08, | |
267 | ||
268 | /** | |
269 | * This permission is required to change the node that this BdrvChild | |
270 | * points to. | |
271 | */ | |
272 | BLK_PERM_GRAPH_MOD = 0x10, | |
273 | ||
274 | BLK_PERM_ALL = 0x1f, | |
7ae9f3f6 AS |
275 | |
276 | DEFAULT_PERM_PASSTHROUGH = BLK_PERM_CONSISTENT_READ | |
277 | | BLK_PERM_WRITE | |
278 | | BLK_PERM_WRITE_UNCHANGED | |
279 | | BLK_PERM_RESIZE, | |
280 | ||
281 | DEFAULT_PERM_UNCHANGED = BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH, | |
7006c9a7 KW |
282 | }; |
283 | ||
3284bcf4 HR |
284 | /* |
285 | * Flags that parent nodes assign to child nodes to specify what kind of | |
286 | * role(s) they take. | |
287 | * | |
288 | * At least one of DATA, METADATA, FILTERED, or COW must be set for | |
289 | * every child. | |
290 | */ | |
291 | enum BdrvChildRoleBits { | |
292 | /* | |
293 | * This child stores data. | |
294 | * Any node may have an arbitrary number of such children. | |
295 | */ | |
296 | BDRV_CHILD_DATA = (1 << 0), | |
297 | ||
298 | /* | |
299 | * This child stores metadata. | |
300 | * Any node may have an arbitrary number of metadata-storing | |
301 | * children. | |
302 | */ | |
303 | BDRV_CHILD_METADATA = (1 << 1), | |
304 | ||
305 | /* | |
306 | * A child that always presents exactly the same visible data as | |
307 | * the parent, e.g. by virtue of the parent forwarding all reads | |
308 | * and writes. | |
309 | * This flag is mutually exclusive with DATA, METADATA, and COW. | |
310 | * Any node may have at most one filtered child at a time. | |
311 | */ | |
312 | BDRV_CHILD_FILTERED = (1 << 2), | |
313 | ||
314 | /* | |
685257a2 | 315 | * Child from which to read all data that isn't allocated in the |
3284bcf4 HR |
316 | * parent (i.e., the backing child); such data is copied to the |
317 | * parent through COW (and optionally COR). | |
318 | * This field is mutually exclusive with DATA, METADATA, and | |
319 | * FILTERED. | |
320 | * Any node may have at most one such backing child at a time. | |
321 | */ | |
322 | BDRV_CHILD_COW = (1 << 3), | |
323 | ||
324 | /* | |
325 | * The primary child. For most drivers, this is the child whose | |
326 | * filename applies best to the parent node. | |
327 | * Any node may have at most one primary child at a time. | |
328 | */ | |
329 | BDRV_CHILD_PRIMARY = (1 << 4), | |
330 | ||
331 | /* Useful combination of flags */ | |
332 | BDRV_CHILD_IMAGE = BDRV_CHILD_DATA | |
333 | | BDRV_CHILD_METADATA | |
334 | | BDRV_CHILD_PRIMARY, | |
335 | }; | |
336 | ||
337 | /* Mask of BdrvChildRoleBits values */ | |
338 | typedef unsigned int BdrvChildRole; | |
339 | ||
5176196c | 340 | char *bdrv_perm_names(uint64_t perm); |
7b1d9c4d | 341 | uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm); |
5176196c | 342 | |
0563e191 | 343 | /* disk I/O throttling */ |
faf07963 | 344 | void bdrv_init(void); |
eb852011 | 345 | void bdrv_init_with_whitelist(void); |
e6ff69bf | 346 | bool bdrv_uses_whitelist(void); |
e8eb8637 | 347 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only); |
98289620 | 348 | BlockDriver *bdrv_find_protocol(const char *filename, |
b65a5e12 HR |
349 | bool allow_protocol_prefix, |
350 | Error **errp); | |
faf07963 | 351 | BlockDriver *bdrv_find_format(const char *format_name); |
0e7e1989 | 352 | int bdrv_create(BlockDriver *drv, const char* filename, |
c282e1fd CL |
353 | QemuOpts *opts, Error **errp); |
354 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); | |
5a5e7f8c | 355 | |
e4e9986b | 356 | BlockDriverState *bdrv_new(void); |
b2c2832c KW |
357 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
358 | Error **errp); | |
5fe31c25 KW |
359 | void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
360 | Error **errp); | |
3f09bfbc | 361 | |
f80f2673 | 362 | int bdrv_parse_aio(const char *mode, int *flags); |
baf5602e | 363 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); |
9e8f1835 | 364 | int bdrv_parse_discard_flags(const char *mode, int *flags); |
b4b059f6 KW |
365 | BdrvChild *bdrv_open_child(const char *filename, |
366 | QDict *options, const char *bdref_key, | |
367 | BlockDriverState* parent, | |
bd86fb99 | 368 | const BdrvChildClass *child_class, |
258b7765 | 369 | BdrvChildRole child_role, |
b4b059f6 | 370 | bool allow_none, Error **errp); |
e1d74bc6 | 371 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp); |
12fa4af6 KW |
372 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
373 | Error **errp); | |
d9b7b057 KW |
374 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
375 | const char *bdref_key, Error **errp); | |
5b363937 HR |
376 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
377 | QDict *options, int flags, Error **errp); | |
680c7f96 KW |
378 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
379 | int flags, Error **errp); | |
e971aa12 | 380 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
077e8e20 AG |
381 | BlockDriverState *bs, QDict *options, |
382 | bool keep_old_opts); | |
5019aece | 383 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); |
6e1000a8 AG |
384 | int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
385 | Error **errp); | |
e971aa12 JC |
386 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
387 | BlockReopenQueue *queue, Error **errp); | |
388 | void bdrv_reopen_commit(BDRVReopenState *reopen_state); | |
389 | void bdrv_reopen_abort(BDRVReopenState *reopen_state); | |
720ff280 | 390 | int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, |
f5a5ca79 | 391 | int bytes, BdrvRequestFlags flags); |
720ff280 | 392 | int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); |
cf2ab8fc | 393 | int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); |
d9ca2ea2 | 394 | int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); |
d9ca2ea2 KW |
395 | int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, |
396 | const void *buf, int count); | |
f08f2dda SH |
397 | /* |
398 | * Efficiently zero a region of the disk image. Note that this is a regular | |
399 | * I/O request like read or write and should have a reasonable size. This | |
400 | * function is not suitable for zeroing the entire image in a single request | |
401 | * because it may allocate memory for the entire region. | |
402 | */ | |
a03ef88f | 403 | int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, |
f5a5ca79 | 404 | int bytes, BdrvRequestFlags flags); |
e8a6bb9c MT |
405 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
406 | const char *backing_file); | |
91af7014 | 407 | void bdrv_refresh_filename(BlockDriverState *bs); |
061ca8a3 | 408 | |
c80d8b06 | 409 | int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact, |
7b8e4857 KW |
410 | PreallocMode prealloc, BdrvRequestFlags flags, |
411 | Error **errp); | |
9bb4b066 VSO |
412 | int generated_co_wrapper |
413 | bdrv_truncate(BdrvChild *child, int64_t offset, bool exact, | |
414 | PreallocMode prealloc, BdrvRequestFlags flags, Error **errp); | |
061ca8a3 | 415 | |
65a9bb25 | 416 | int64_t bdrv_nb_sectors(BlockDriverState *bs); |
faf07963 | 417 | int64_t bdrv_getlength(BlockDriverState *bs); |
4a1d5e1f | 418 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); |
90880ff1 SH |
419 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
420 | BlockDriverState *in_bs, Error **errp); | |
96b8f136 | 421 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); |
3baca891 | 422 | void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); |
faf07963 | 423 | int bdrv_commit(BlockDriverState *bs); |
6f7a3b53 | 424 | int bdrv_make_empty(BdrvChild *c, Error **errp); |
e54ee1b3 EB |
425 | int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file, |
426 | const char *backing_fmt, bool warn); | |
5efa9d5a | 427 | void bdrv_register(BlockDriver *bdrv); |
bde70715 | 428 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
54e26900 | 429 | const char *backing_file_str); |
6ebdcee2 JC |
430 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
431 | BlockDriverState *bs); | |
79fac568 | 432 | BlockDriverState *bdrv_find_base(BlockDriverState *bs); |
2cad1ebe AG |
433 | bool bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, |
434 | Error **errp); | |
435 | int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, | |
436 | Error **errp); | |
437 | void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base); | |
e1d7f8bb | 438 | int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp); |
5efa9d5a | 439 | |
e076f338 KW |
440 | |
441 | typedef struct BdrvCheckResult { | |
442 | int corruptions; | |
443 | int leaks; | |
444 | int check_errors; | |
ccf34716 KW |
445 | int corruptions_fixed; |
446 | int leaks_fixed; | |
c6bb9ad1 | 447 | int64_t image_end_offset; |
f8111c24 | 448 | BlockFragInfo bfi; |
e076f338 KW |
449 | } BdrvCheckResult; |
450 | ||
4534ff54 KW |
451 | typedef enum { |
452 | BDRV_FIX_LEAKS = 1, | |
453 | BDRV_FIX_ERRORS = 2, | |
454 | } BdrvCheckMode; | |
455 | ||
9bb4b066 VSO |
456 | int generated_co_wrapper bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, |
457 | BdrvCheckMode fix); | |
e076f338 | 458 | |
77485434 HR |
459 | /* The units of offset and total_work_size may be chosen arbitrarily by the |
460 | * block driver; total_work_size may change during the course of the amendment | |
461 | * operation */ | |
462 | typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, | |
8b13976d | 463 | int64_t total_work_size, void *opaque); |
77485434 | 464 | int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, |
d1402b50 | 465 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
a3579bfa | 466 | bool force, |
d1402b50 | 467 | Error **errp); |
6f176b48 | 468 | |
09158f00 | 469 | /* check if a named node can be replaced when doing drive-mirror */ |
e12f3784 WC |
470 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
471 | const char *node_name, Error **errp); | |
09158f00 | 472 | |
faf07963 | 473 | /* async block I/O */ |
7c84b1b8 MA |
474 | void bdrv_aio_cancel(BlockAIOCB *acb); |
475 | void bdrv_aio_cancel_async(BlockAIOCB *acb); | |
faf07963 | 476 | |
7d780669 | 477 | /* sg packet commands */ |
48af776a | 478 | int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); |
7d780669 | 479 | |
0f15423c | 480 | /* Invalidate any cached metadata used by image formats */ |
9bb4b066 VSO |
481 | int generated_co_wrapper bdrv_invalidate_cache(BlockDriverState *bs, |
482 | Error **errp); | |
5a8a30db | 483 | void bdrv_invalidate_cache_all(Error **errp); |
76b1c7fe | 484 | int bdrv_inactivate_all(void); |
0f15423c | 485 | |
faf07963 | 486 | /* Ensure contents are flushed to disk. */ |
9bb4b066 | 487 | int generated_co_wrapper bdrv_flush(BlockDriverState *bs); |
07f07615 | 488 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs); |
4085f5c7 | 489 | int bdrv_flush_all(void); |
2bc93fed | 490 | void bdrv_close_all(void); |
5b98db0a | 491 | void bdrv_drain(BlockDriverState *bs); |
a77fd4bb | 492 | void coroutine_fn bdrv_co_drain(BlockDriverState *bs); |
c0778f66 AG |
493 | void bdrv_drain_all_begin(void); |
494 | void bdrv_drain_all_end(void); | |
922453bc | 495 | void bdrv_drain_all(void); |
c6ca28d6 | 496 | |
88b062c2 | 497 | #define BDRV_POLL_WHILE(bs, cond) ({ \ |
88b062c2 | 498 | BlockDriverState *bs_ = (bs); \ |
cfe29d82 | 499 | AIO_WAIT_WHILE(bdrv_get_aio_context(bs_), \ |
7719f3c9 | 500 | cond); }) |
88b062c2 | 501 | |
9bb4b066 VSO |
502 | int generated_co_wrapper bdrv_pdiscard(BdrvChild *child, int64_t offset, |
503 | int64_t bytes); | |
d93e5726 | 504 | int bdrv_co_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes); |
3ac21627 | 505 | int bdrv_has_zero_init_1(BlockDriverState *bs); |
f2feebbd | 506 | int bdrv_has_zero_init(BlockDriverState *bs); |
4ce78691 | 507 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); |
237d78f8 EB |
508 | int bdrv_block_status(BlockDriverState *bs, int64_t offset, |
509 | int64_t bytes, int64_t *pnum, int64_t *map, | |
510 | BlockDriverState **file); | |
31826642 EB |
511 | int bdrv_block_status_above(BlockDriverState *bs, BlockDriverState *base, |
512 | int64_t offset, int64_t bytes, int64_t *pnum, | |
513 | int64_t *map, BlockDriverState **file); | |
d6a644bb EB |
514 | int bdrv_is_allocated(BlockDriverState *bs, int64_t offset, int64_t bytes, |
515 | int64_t *pnum); | |
b35b2bba | 516 | int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, |
170d3bd3 AS |
517 | bool include_base, int64_t offset, int64_t bytes, |
518 | int64_t *pnum); | |
46cd1e8a AG |
519 | int coroutine_fn bdrv_co_is_zero_fast(BlockDriverState *bs, int64_t offset, |
520 | int64_t bytes); | |
faf07963 | 521 | |
54115412 | 522 | bool bdrv_is_read_only(BlockDriverState *bs); |
54a32bfe KW |
523 | int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
524 | bool ignore_allow_rdw, Error **errp); | |
eaa2410f KW |
525 | int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, |
526 | Error **errp); | |
cc022140 | 527 | bool bdrv_is_writable(BlockDriverState *bs); |
54115412 | 528 | bool bdrv_is_sg(BlockDriverState *bs); |
e031f750 | 529 | bool bdrv_is_inserted(BlockDriverState *bs); |
025e849a | 530 | void bdrv_lock_medium(BlockDriverState *bs, bool locked); |
f36f3949 | 531 | void bdrv_eject(BlockDriverState *bs, bool eject_flag); |
f8d6bba1 | 532 | const char *bdrv_get_format_name(BlockDriverState *bs); |
dc364f4c | 533 | BlockDriverState *bdrv_find_node(const char *node_name); |
facda544 | 534 | BlockDeviceInfoList *bdrv_named_nodes_list(bool flat, Error **errp); |
5d3b4e99 | 535 | XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp); |
12d3ba82 BC |
536 | BlockDriverState *bdrv_lookup_bs(const char *device, |
537 | const char *node_name, | |
538 | Error **errp); | |
5a6684d2 | 539 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); |
04df765a | 540 | BlockDriverState *bdrv_next_node(BlockDriverState *bs); |
0f12264e | 541 | BlockDriverState *bdrv_next_all_states(BlockDriverState *bs); |
88be7b4b KW |
542 | |
543 | typedef struct BdrvNextIterator { | |
544 | enum { | |
545 | BDRV_NEXT_BACKEND_ROOTS, | |
546 | BDRV_NEXT_MONITOR_OWNED, | |
547 | } phase; | |
548 | BlockBackend *blk; | |
549 | BlockDriverState *bs; | |
550 | } BdrvNextIterator; | |
551 | ||
552 | BlockDriverState *bdrv_first(BdrvNextIterator *it); | |
553 | BlockDriverState *bdrv_next(BdrvNextIterator *it); | |
5e003f17 | 554 | void bdrv_next_cleanup(BdrvNextIterator *it); |
88be7b4b | 555 | |
262b4e8f | 556 | BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); |
ae23f786 | 557 | bool bdrv_supports_compressed_writes(BlockDriverState *bs); |
faf07963 | 558 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
9ac404c5 | 559 | void *opaque, bool read_only); |
20a9e77d | 560 | const char *bdrv_get_node_name(const BlockDriverState *bs); |
bfb197e0 | 561 | const char *bdrv_get_device_name(const BlockDriverState *bs); |
9b2aa84f | 562 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); |
c8433287 | 563 | int bdrv_get_flags(BlockDriverState *bs); |
faf07963 | 564 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); |
1bf6e9ca AS |
565 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
566 | Error **errp); | |
d9245599 | 567 | BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs); |
343bded4 | 568 | void bdrv_round_to_clusters(BlockDriverState *bs, |
7cfd5275 | 569 | int64_t offset, int64_t bytes, |
244483e6 | 570 | int64_t *cluster_offset, |
7cfd5275 | 571 | int64_t *cluster_bytes); |
faf07963 PB |
572 | |
573 | void bdrv_get_backing_filename(BlockDriverState *bs, | |
574 | char *filename, int filename_size); | |
6b6833c1 | 575 | char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp); |
645ae7d8 HR |
576 | char *bdrv_get_full_backing_filename_from_filename(const char *backed, |
577 | const char *backing, | |
578 | Error **errp); | |
1e89d0f9 | 579 | char *bdrv_dirname(BlockDriverState *bs, Error **errp); |
faf07963 | 580 | |
5c98415b | 581 | int path_has_protocol(const char *path); |
faf07963 | 582 | int path_is_absolute(const char *path); |
009b03aa | 583 | char *path_combine(const char *base_path, const char *filename); |
faf07963 | 584 | |
b33b354f VSO |
585 | int generated_co_wrapper |
586 | bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); | |
587 | int generated_co_wrapper | |
588 | bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); | |
45566e9c CH |
589 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
590 | int64_t pos, int size); | |
178e08a5 | 591 | |
45566e9c CH |
592 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
593 | int64_t pos, int size); | |
178e08a5 | 594 | |
d92ada22 LC |
595 | void bdrv_img_create(const char *filename, const char *fmt, |
596 | const char *base_filename, const char *base_fmt, | |
f382d43a | 597 | char *options, uint64_t img_size, int flags, |
9217283d | 598 | bool quiet, Error **errp); |
f88e1a42 | 599 | |
339064d5 KW |
600 | /* Returns the alignment in bytes that is required so that no bounce buffer |
601 | * is required throughout the stack */ | |
4196d2f0 DL |
602 | size_t bdrv_min_mem_align(BlockDriverState *bs); |
603 | /* Returns optimal alignment in bytes for bounce buffer */ | |
339064d5 | 604 | size_t bdrv_opt_mem_align(BlockDriverState *bs); |
ba5b7ad4 | 605 | void *qemu_blockalign(BlockDriverState *bs, size_t size); |
9ebd8448 | 606 | void *qemu_blockalign0(BlockDriverState *bs, size_t size); |
7d2a35cc | 607 | void *qemu_try_blockalign(BlockDriverState *bs, size_t size); |
9ebd8448 | 608 | void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); |
c53b1c51 | 609 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); |
ba5b7ad4 | 610 | |
53fec9d3 SH |
611 | void bdrv_enable_copy_on_read(BlockDriverState *bs); |
612 | void bdrv_disable_copy_on_read(BlockDriverState *bs); | |
613 | ||
9fcb0251 FZ |
614 | void bdrv_ref(BlockDriverState *bs); |
615 | void bdrv_unref(BlockDriverState *bs); | |
33a60407 | 616 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); |
98292c61 WC |
617 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
618 | BlockDriverState *child_bs, | |
619 | const char *child_name, | |
bd86fb99 | 620 | const BdrvChildClass *child_class, |
258b7765 | 621 | BdrvChildRole child_role, |
8b2ff529 | 622 | Error **errp); |
8b9b0cc2 | 623 | |
fbe40ff7 FZ |
624 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); |
625 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); | |
626 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); | |
627 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason); | |
628 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); | |
629 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs); | |
630 | ||
9a4f4c31 KW |
631 | #define BLKDBG_EVENT(child, evt) \ |
632 | do { \ | |
633 | if (child) { \ | |
634 | bdrv_debug_event(child->bs, evt); \ | |
635 | } \ | |
636 | } while (0) | |
637 | ||
a31939e6 | 638 | void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); |
8b9b0cc2 | 639 | |
41c695c7 KW |
640 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
641 | const char *tag); | |
4cc70e93 | 642 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); |
41c695c7 KW |
643 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag); |
644 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); | |
645 | ||
db519cba FZ |
646 | /** |
647 | * bdrv_get_aio_context: | |
648 | * | |
649 | * Returns: the currently bound #AioContext | |
650 | */ | |
651 | AioContext *bdrv_get_aio_context(BlockDriverState *bs); | |
652 | ||
e336fd4c KW |
653 | /** |
654 | * Move the current coroutine to the AioContext of @bs and return the old | |
655 | * AioContext of the coroutine. Increase bs->in_flight so that draining @bs | |
656 | * will wait for the operation to proceed until the corresponding | |
657 | * bdrv_co_leave(). | |
658 | * | |
659 | * Consequently, you can't call drain inside a bdrv_co_enter/leave() section as | |
660 | * this will deadlock. | |
661 | */ | |
662 | AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs); | |
663 | ||
664 | /** | |
665 | * Ends a section started by bdrv_co_enter(). Move the current coroutine back | |
666 | * to old_ctx and decrease bs->in_flight again. | |
667 | */ | |
668 | void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx); | |
669 | ||
18c6ac1c KW |
670 | /** |
671 | * Locks the AioContext of @bs if it's not the current AioContext. This avoids | |
672 | * double locking which could lead to deadlocks: This is a coroutine_fn, so we | |
673 | * know we already own the lock of the current AioContext. | |
674 | * | |
675 | * May only be called in the main thread. | |
676 | */ | |
677 | void coroutine_fn bdrv_co_lock(BlockDriverState *bs); | |
678 | ||
679 | /** | |
680 | * Unlocks the AioContext of @bs if it's not the current AioContext. | |
681 | */ | |
682 | void coroutine_fn bdrv_co_unlock(BlockDriverState *bs); | |
683 | ||
052a7572 FZ |
684 | /** |
685 | * Transfer control to @co in the aio context of @bs | |
686 | */ | |
687 | void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); | |
688 | ||
53a7d041 KW |
689 | void bdrv_set_aio_context_ignore(BlockDriverState *bs, |
690 | AioContext *new_context, GSList **ignore); | |
5d231849 KW |
691 | int bdrv_try_set_aio_context(BlockDriverState *bs, AioContext *ctx, |
692 | Error **errp); | |
693 | int bdrv_child_try_set_aio_context(BlockDriverState *bs, AioContext *ctx, | |
694 | BdrvChild *ignore_child, Error **errp); | |
695 | bool bdrv_child_can_set_aio_context(BdrvChild *c, AioContext *ctx, | |
696 | GSList **ignore, Error **errp); | |
697 | bool bdrv_can_set_aio_context(BlockDriverState *bs, AioContext *ctx, | |
698 | GSList **ignore, Error **errp); | |
892b7de8 ET |
699 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); |
700 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); | |
dcd04228 | 701 | |
448ad91d ML |
702 | void bdrv_io_plug(BlockDriverState *bs); |
703 | void bdrv_io_unplug(BlockDriverState *bs); | |
448ad91d | 704 | |
4be6a6d1 KW |
705 | /** |
706 | * bdrv_parent_drained_begin_single: | |
707 | * | |
708 | * Begin a quiesced section for the parent of @c. If @poll is true, wait for | |
709 | * any pending activity to cease. | |
710 | */ | |
711 | void bdrv_parent_drained_begin_single(BdrvChild *c, bool poll); | |
712 | ||
804db8ea HR |
713 | /** |
714 | * bdrv_parent_drained_end_single: | |
715 | * | |
716 | * End a quiesced section for the parent of @c. | |
e037c09c HR |
717 | * |
718 | * This polls @bs's AioContext until all scheduled sub-drained_ends | |
719 | * have settled, which may result in graph changes. | |
804db8ea HR |
720 | */ |
721 | void bdrv_parent_drained_end_single(BdrvChild *c); | |
722 | ||
89bd0305 KW |
723 | /** |
724 | * bdrv_drain_poll: | |
725 | * | |
fe4f0614 | 726 | * Poll for pending requests in @bs, its parents (except for @ignore_parent), |
6cd5c9d7 KW |
727 | * and if @recursive is true its children as well (used for subtree drain). |
728 | * | |
729 | * If @ignore_bds_parents is true, parents that are BlockDriverStates must | |
730 | * ignore the drain request because they will be drained separately (used for | |
731 | * drain_all). | |
fe4f0614 KW |
732 | * |
733 | * This is part of bdrv_drained_begin. | |
89bd0305 | 734 | */ |
fe4f0614 | 735 | bool bdrv_drain_poll(BlockDriverState *bs, bool recursive, |
6cd5c9d7 | 736 | BdrvChild *ignore_parent, bool ignore_bds_parents); |
89bd0305 | 737 | |
51288d79 FZ |
738 | /** |
739 | * bdrv_drained_begin: | |
740 | * | |
741 | * Begin a quiesced section for exclusive access to the BDS, by disabling | |
742 | * external request sources including NBD server and device model. Note that | |
743 | * this doesn't block timers or coroutines from submitting more requests, which | |
744 | * means block_job_pause is still necessary. | |
745 | * | |
746 | * This function can be recursive. | |
747 | */ | |
748 | void bdrv_drained_begin(BlockDriverState *bs); | |
749 | ||
dcf94a23 KW |
750 | /** |
751 | * bdrv_do_drained_begin_quiesce: | |
752 | * | |
753 | * Quiesces a BDS like bdrv_drained_begin(), but does not wait for already | |
754 | * running requests to complete. | |
755 | */ | |
756 | void bdrv_do_drained_begin_quiesce(BlockDriverState *bs, | |
6cd5c9d7 | 757 | BdrvChild *parent, bool ignore_bds_parents); |
dcf94a23 | 758 | |
b0165585 KW |
759 | /** |
760 | * Like bdrv_drained_begin, but recursively begins a quiesced section for | |
761 | * exclusive access to all child nodes as well. | |
b0165585 KW |
762 | */ |
763 | void bdrv_subtree_drained_begin(BlockDriverState *bs); | |
764 | ||
51288d79 FZ |
765 | /** |
766 | * bdrv_drained_end: | |
767 | * | |
768 | * End a quiescent section started by bdrv_drained_begin(). | |
e037c09c HR |
769 | * |
770 | * This polls @bs's AioContext until all scheduled sub-drained_ends | |
771 | * have settled. On one hand, that may result in graph changes. On | |
43eaaaef HR |
772 | * the other, this requires that the caller either runs in the main |
773 | * loop; or that all involved nodes (@bs and all of its parents) are | |
774 | * in the caller's AioContext. | |
51288d79 FZ |
775 | */ |
776 | void bdrv_drained_end(BlockDriverState *bs); | |
777 | ||
e037c09c HR |
778 | /** |
779 | * bdrv_drained_end_no_poll: | |
780 | * | |
781 | * Same as bdrv_drained_end(), but do not poll for the subgraph to | |
782 | * actually become unquiesced. Therefore, no graph changes will occur | |
783 | * with this function. | |
784 | * | |
785 | * *drained_end_counter is incremented for every background operation | |
786 | * that is scheduled, and will be decremented for every operation once | |
787 | * it settles. The caller must poll until it reaches 0. The counter | |
788 | * should be accessed using atomic operations only. | |
789 | */ | |
790 | void bdrv_drained_end_no_poll(BlockDriverState *bs, int *drained_end_counter); | |
791 | ||
b0165585 KW |
792 | /** |
793 | * End a quiescent section started by bdrv_subtree_drained_begin(). | |
794 | */ | |
795 | void bdrv_subtree_drained_end(BlockDriverState *bs); | |
796 | ||
e06018ad WC |
797 | void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, |
798 | Error **errp); | |
799 | void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); | |
800 | ||
67b792f5 VSO |
801 | bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, |
802 | uint32_t granularity, Error **errp); | |
23d0ba93 FZ |
803 | /** |
804 | * | |
805 | * bdrv_register_buf/bdrv_unregister_buf: | |
806 | * | |
807 | * Register/unregister a buffer for I/O. For example, VFIO drivers are | |
808 | * interested to know the memory areas that would later be used for I/O, so | |
809 | * that they can prepare IOMMU mapping etc., to get better performance. | |
810 | */ | |
811 | void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size); | |
812 | void bdrv_unregister_buf(BlockDriverState *bs, void *host); | |
fcc67678 FZ |
813 | |
814 | /** | |
815 | * | |
816 | * bdrv_co_copy_range: | |
817 | * | |
818 | * Do offloaded copy between two children. If the operation is not implemented | |
819 | * by the driver, or if the backend storage doesn't support it, a negative | |
820 | * error code will be returned. | |
821 | * | |
822 | * Note: block layer doesn't emulate or fallback to a bounce buffer approach | |
823 | * because usually the caller shouldn't attempt offloaded copy any more (e.g. | |
824 | * calling copy_file_range(2)) after the first error, thus it should fall back | |
825 | * to a read+write path in the caller level. | |
826 | * | |
827 | * @src: Source child to copy data from | |
828 | * @src_offset: offset in @src image to read data | |
829 | * @dst: Destination child to copy data to | |
830 | * @dst_offset: offset in @dst image to write data | |
831 | * @bytes: number of bytes to copy | |
dee12de8 | 832 | * @flags: request flags. Supported flags: |
fcc67678 FZ |
833 | * BDRV_REQ_ZERO_WRITE - treat the @src range as zero data and do zero |
834 | * write on @dst as if bdrv_co_pwrite_zeroes is | |
835 | * called. Used to simplify caller code, or | |
836 | * during BlockDriver.bdrv_co_copy_range_from() | |
837 | * recursion. | |
dee12de8 FZ |
838 | * BDRV_REQ_NO_SERIALISING - do not serialize with other overlapping |
839 | * requests currently in flight. | |
fcc67678 FZ |
840 | * |
841 | * Returns: 0 if succeeded; negative error code if failed. | |
842 | **/ | |
843 | int coroutine_fn bdrv_co_copy_range(BdrvChild *src, uint64_t src_offset, | |
844 | BdrvChild *dst, uint64_t dst_offset, | |
67b51fb9 VSO |
845 | uint64_t bytes, BdrvRequestFlags read_flags, |
846 | BdrvRequestFlags write_flags); | |
8a4bc5aa | 847 | #endif |