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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 | |
faf07963 | 13 | /* block.c */ |
faf07963 | 14 | typedef struct BlockDriver BlockDriver; |
b4b059f6 | 15 | typedef struct BdrvChild BdrvChild; |
f3930ed0 | 16 | typedef struct BdrvChildRole BdrvChildRole; |
faf07963 | 17 | |
faf07963 PB |
18 | typedef struct BlockDriverInfo { |
19 | /* in bytes, 0 if irrelevant */ | |
20 | int cluster_size; | |
21 | /* offset at which the VM state can be saved (0 if not possible) */ | |
22 | int64_t vm_state_offset; | |
64c79160 | 23 | bool is_dirty; |
e1a5c4be PL |
24 | /* |
25 | * True if unallocated blocks read back as zeroes. This is equivalent | |
b6af0975 | 26 | * to the LBPRZ flag in the SCSI logical block provisioning page. |
e1a5c4be PL |
27 | */ |
28 | bool unallocated_blocks_are_zero; | |
85f49cad FZ |
29 | /* |
30 | * True if this block driver only supports compressed writes | |
31 | */ | |
32 | bool needs_compressed_writes; | |
faf07963 PB |
33 | } BlockDriverInfo; |
34 | ||
f8111c24 DXW |
35 | typedef struct BlockFragInfo { |
36 | uint64_t allocated_clusters; | |
37 | uint64_t total_clusters; | |
38 | uint64_t fragmented_clusters; | |
e6439d78 | 39 | uint64_t compressed_clusters; |
f8111c24 DXW |
40 | } BlockFragInfo; |
41 | ||
6faac15f | 42 | typedef enum { |
9568b511 WC |
43 | BDRV_REQ_COPY_ON_READ = 0x1, |
44 | BDRV_REQ_ZERO_WRITE = 0x2, | |
52ebcb26 KW |
45 | |
46 | /* | |
47 | * The BDRV_REQ_MAY_UNMAP flag is used in write_zeroes requests to indicate | |
48 | * that the block driver should unmap (discard) blocks if it is guaranteed | |
49 | * that the result will read back as zeroes. The flag is only passed to the | |
50 | * driver if the block device is opened with BDRV_O_UNMAP. | |
d32f35cb | 51 | */ |
9568b511 | 52 | BDRV_REQ_MAY_UNMAP = 0x4, |
999658a0 VSO |
53 | |
54 | /* | |
55 | * The BDRV_REQ_NO_SERIALISING flag is only valid for reads and means that | |
56 | * we don't want wait_serialising_requests() during the read operation. | |
57 | * | |
58 | * This flag is used for backup copy-on-write operations, when we need to | |
59 | * read old data before write (write notifier triggered). It is okay since | |
60 | * we already waited for other serializing requests in the initiating write | |
61 | * (see bdrv_aligned_pwritev), and it is necessary if the initiating write | |
62 | * is already serializing (without the flag, the read would deadlock | |
63 | * waiting for the serialising write to complete). | |
64 | */ | |
61408b25 | 65 | BDRV_REQ_NO_SERIALISING = 0x8, |
bfd18d1e | 66 | BDRV_REQ_FUA = 0x10, |
29a298af | 67 | BDRV_REQ_WRITE_COMPRESSED = 0x20, |
fa166538 | 68 | |
c6035964 HR |
69 | /* Signifies that this write request will not change the visible disk |
70 | * content. */ | |
71 | BDRV_REQ_WRITE_UNCHANGED = 0x40, | |
72 | ||
09d2f948 VSO |
73 | /* |
74 | * BDRV_REQ_SERIALISING forces request serialisation for writes. | |
75 | * It is used to ensure that writes to the backing file of a backup process | |
76 | * target cannot race with a read of the backup target that defers to the | |
77 | * backing file. | |
78 | * | |
79 | * Note, that BDRV_REQ_SERIALISING is _not_ opposite in meaning to | |
80 | * BDRV_REQ_NO_SERIALISING. A more descriptive name for the latter might be | |
81 | * _DO_NOT_WAIT_FOR_SERIALISING, except that is too long. | |
82 | */ | |
83 | BDRV_REQ_SERIALISING = 0x80, | |
84 | ||
fe0480d6 KW |
85 | /* Execute the request only if the operation can be offloaded or otherwise |
86 | * be executed efficiently, but return an error instead of using a slow | |
87 | * fallback. */ | |
88 | BDRV_REQ_NO_FALLBACK = 0x100, | |
89 | ||
3299e5ec VSO |
90 | /* |
91 | * BDRV_REQ_PREFETCH may be used only together with BDRV_REQ_COPY_ON_READ | |
92 | * on read request and means that caller doesn't really need data to be | |
93 | * written to qiov parameter which may be NULL. | |
94 | */ | |
95 | BDRV_REQ_PREFETCH = 0x200, | |
fa166538 | 96 | /* Mask of valid flags */ |
3299e5ec | 97 | BDRV_REQ_MASK = 0x3ff, |
6faac15f PL |
98 | } BdrvRequestFlags; |
99 | ||
892b7de8 ET |
100 | typedef struct BlockSizes { |
101 | uint32_t phys; | |
102 | uint32_t log; | |
103 | } BlockSizes; | |
104 | ||
105 | typedef struct HDGeometry { | |
106 | uint32_t heads; | |
107 | uint32_t sectors; | |
108 | uint32_t cylinders; | |
109 | } HDGeometry; | |
110 | ||
faf07963 | 111 | #define BDRV_O_RDWR 0x0002 |
55880601 | 112 | #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */ |
faf07963 | 113 | #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ |
8bfea15d | 114 | #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ |
9f7965c7 | 115 | #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ |
5c6c3a6c | 116 | #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ |
b783e409 | 117 | #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ |
016f5cf6 | 118 | #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ |
53fec9d3 | 119 | #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ |
04c01a5c | 120 | #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ |
058f8f16 | 121 | #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ |
be028adc | 122 | #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ |
9e8f1835 | 123 | #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ |
2e40134b HR |
124 | #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: |
125 | select an appropriate protocol driver, | |
126 | ignoring the format layer */ | |
abb06c5a | 127 | #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ |
e35bdc12 | 128 | #define BDRV_O_AUTO_RDONLY 0x20000 /* degrade to read-only if opening read-write fails */ |
9f7965c7 | 129 | |
61de4c68 | 130 | #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) |
faf07963 | 131 | |
54861b92 KW |
132 | |
133 | /* Option names of options parsed by the block layer */ | |
134 | ||
135 | #define BDRV_OPT_CACHE_WB "cache.writeback" | |
136 | #define BDRV_OPT_CACHE_DIRECT "cache.direct" | |
137 | #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" | |
f87a0e29 | 138 | #define BDRV_OPT_READ_ONLY "read-only" |
e35bdc12 | 139 | #define BDRV_OPT_AUTO_READ_ONLY "auto-read-only" |
818584a4 | 140 | #define BDRV_OPT_DISCARD "discard" |
5a9347c6 | 141 | #define BDRV_OPT_FORCE_SHARE "force-share" |
54861b92 KW |
142 | |
143 | ||
6ea44308 | 144 | #define BDRV_SECTOR_BITS 9 |
c63782cb | 145 | #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) |
3abbc4d9 | 146 | #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) |
6ea44308 | 147 | |
75af1f34 PL |
148 | #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ |
149 | INT_MAX >> BDRV_SECTOR_BITS) | |
48265250 | 150 | #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) |
75af1f34 | 151 | |
705be728 | 152 | /* |
237d78f8 | 153 | * Allocation status flags for bdrv_block_status() and friends. |
4c41cb49 EB |
154 | * |
155 | * Public flags: | |
156 | * BDRV_BLOCK_DATA: allocation for data at offset is tied to this layer | |
157 | * BDRV_BLOCK_ZERO: offset reads as zero | |
158 | * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data | |
e88ae226 | 159 | * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this |
86a3d5c6 EB |
160 | * layer rather than any backing, set by block layer |
161 | * BDRV_BLOCK_EOF: the returned pnum covers through end of file for this | |
162 | * layer, set by block layer | |
4333bb71 | 163 | * |
69f47505 | 164 | * Internal flags: |
d5254033 EB |
165 | * BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request |
166 | * that the block layer recompute the answer from the returned | |
167 | * BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID. | |
69f47505 VSO |
168 | * BDRV_BLOCK_RECURSE: request that the block layer will recursively search for |
169 | * zeroes in file child of current block node inside | |
170 | * returned region. Only valid together with both | |
171 | * BDRV_BLOCK_DATA and BDRV_BLOCK_OFFSET_VALID. Should not | |
172 | * appear with BDRV_BLOCK_ZERO. | |
4333bb71 | 173 | * |
86a3d5c6 EB |
174 | * If BDRV_BLOCK_OFFSET_VALID is set, the map parameter represents the |
175 | * host offset within the returned BDS that is allocated for the | |
176 | * corresponding raw guest data. However, whether that offset | |
177 | * actually contains data also depends on BDRV_BLOCK_DATA, as follows: | |
4333bb71 PB |
178 | * |
179 | * DATA ZERO OFFSET_VALID | |
4c41cb49 EB |
180 | * t t t sectors read as zero, returned file is zero at offset |
181 | * t f t sectors read as valid from file at offset | |
182 | * f t t sectors preallocated, read as zero, returned file not | |
4333bb71 PB |
183 | * necessarily zero at offset |
184 | * f f t sectors preallocated but read from backing_hd, | |
4c41cb49 | 185 | * returned file contains garbage at offset |
4333bb71 PB |
186 | * t t f sectors preallocated, read as zero, unknown offset |
187 | * t f f sectors read from unknown file or offset | |
188 | * f t f not allocated or unknown offset, read as zero | |
189 | * f f f not allocated or unknown offset, read from backing_hd | |
190 | */ | |
e88ae226 KW |
191 | #define BDRV_BLOCK_DATA 0x01 |
192 | #define BDRV_BLOCK_ZERO 0x02 | |
193 | #define BDRV_BLOCK_OFFSET_VALID 0x04 | |
194 | #define BDRV_BLOCK_RAW 0x08 | |
195 | #define BDRV_BLOCK_ALLOCATED 0x10 | |
fb0d8654 | 196 | #define BDRV_BLOCK_EOF 0x20 |
69f47505 | 197 | #define BDRV_BLOCK_RECURSE 0x40 |
4333bb71 PB |
198 | #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK |
199 | ||
e971aa12 JC |
200 | typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; |
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 | ||
5176196c FZ |
284 | char *bdrv_perm_names(uint64_t perm); |
285 | ||
0563e191 | 286 | /* disk I/O throttling */ |
faf07963 | 287 | void bdrv_init(void); |
eb852011 | 288 | void bdrv_init_with_whitelist(void); |
e6ff69bf | 289 | bool bdrv_uses_whitelist(void); |
e8eb8637 | 290 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only); |
98289620 | 291 | BlockDriver *bdrv_find_protocol(const char *filename, |
b65a5e12 HR |
292 | bool allow_protocol_prefix, |
293 | Error **errp); | |
faf07963 | 294 | BlockDriver *bdrv_find_format(const char *format_name); |
0e7e1989 | 295 | int bdrv_create(BlockDriver *drv, const char* filename, |
c282e1fd CL |
296 | QemuOpts *opts, Error **errp); |
297 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); | |
e4e9986b | 298 | BlockDriverState *bdrv_new(void); |
b2c2832c KW |
299 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
300 | Error **errp); | |
5fe31c25 KW |
301 | void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
302 | Error **errp); | |
3f09bfbc | 303 | |
baf5602e | 304 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); |
9e8f1835 | 305 | int bdrv_parse_discard_flags(const char *mode, int *flags); |
b4b059f6 KW |
306 | BdrvChild *bdrv_open_child(const char *filename, |
307 | QDict *options, const char *bdref_key, | |
308 | BlockDriverState* parent, | |
309 | const BdrvChildRole *child_role, | |
310 | bool allow_none, Error **errp); | |
e1d74bc6 | 311 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp); |
12fa4af6 KW |
312 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
313 | Error **errp); | |
d9b7b057 KW |
314 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
315 | const char *bdref_key, Error **errp); | |
5b363937 HR |
316 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
317 | QDict *options, int flags, Error **errp); | |
680c7f96 KW |
318 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
319 | int flags, Error **errp); | |
e971aa12 | 320 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
077e8e20 AG |
321 | BlockDriverState *bs, QDict *options, |
322 | bool keep_old_opts); | |
5019aece | 323 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); |
6e1000a8 AG |
324 | int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
325 | Error **errp); | |
e971aa12 JC |
326 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
327 | BlockReopenQueue *queue, Error **errp); | |
328 | void bdrv_reopen_commit(BDRVReopenState *reopen_state); | |
329 | void bdrv_reopen_abort(BDRVReopenState *reopen_state); | |
720ff280 | 330 | int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, |
f5a5ca79 | 331 | int bytes, BdrvRequestFlags flags); |
720ff280 | 332 | int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); |
cf2ab8fc KW |
333 | int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); |
334 | int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); | |
d9ca2ea2 KW |
335 | int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); |
336 | int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); | |
337 | int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, | |
338 | const void *buf, int count); | |
f08f2dda SH |
339 | /* |
340 | * Efficiently zero a region of the disk image. Note that this is a regular | |
341 | * I/O request like read or write and should have a reasonable size. This | |
342 | * function is not suitable for zeroing the entire image in a single request | |
343 | * because it may allocate memory for the entire region. | |
344 | */ | |
a03ef88f | 345 | int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, |
f5a5ca79 | 346 | int bytes, BdrvRequestFlags flags); |
e8a6bb9c MT |
347 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
348 | const char *backing_file); | |
91af7014 | 349 | void bdrv_refresh_filename(BlockDriverState *bs); |
061ca8a3 KW |
350 | |
351 | int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, | |
352 | PreallocMode prealloc, Error **errp); | |
7ea37c30 HR |
353 | int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc, |
354 | Error **errp); | |
061ca8a3 | 355 | |
65a9bb25 | 356 | int64_t bdrv_nb_sectors(BlockDriverState *bs); |
faf07963 | 357 | int64_t bdrv_getlength(BlockDriverState *bs); |
4a1d5e1f | 358 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); |
90880ff1 SH |
359 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
360 | BlockDriverState *in_bs, Error **errp); | |
96b8f136 | 361 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); |
3baca891 | 362 | void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); |
faf07963 | 363 | int bdrv_commit(BlockDriverState *bs); |
756e6736 KW |
364 | int bdrv_change_backing_file(BlockDriverState *bs, |
365 | const char *backing_file, const char *backing_fmt); | |
5efa9d5a | 366 | void bdrv_register(BlockDriver *bdrv); |
bde70715 | 367 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
54e26900 | 368 | const char *backing_file_str); |
6ebdcee2 JC |
369 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
370 | BlockDriverState *bs); | |
79fac568 | 371 | BlockDriverState *bdrv_find_base(BlockDriverState *bs); |
2cad1ebe AG |
372 | bool bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, |
373 | Error **errp); | |
374 | int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, | |
375 | Error **errp); | |
376 | void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base); | |
5efa9d5a | 377 | |
e076f338 KW |
378 | |
379 | typedef struct BdrvCheckResult { | |
380 | int corruptions; | |
381 | int leaks; | |
382 | int check_errors; | |
ccf34716 KW |
383 | int corruptions_fixed; |
384 | int leaks_fixed; | |
c6bb9ad1 | 385 | int64_t image_end_offset; |
f8111c24 | 386 | BlockFragInfo bfi; |
e076f338 KW |
387 | } BdrvCheckResult; |
388 | ||
4534ff54 KW |
389 | typedef enum { |
390 | BDRV_FIX_LEAKS = 1, | |
391 | BDRV_FIX_ERRORS = 2, | |
392 | } BdrvCheckMode; | |
393 | ||
394 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); | |
e076f338 | 395 | |
77485434 HR |
396 | /* The units of offset and total_work_size may be chosen arbitrarily by the |
397 | * block driver; total_work_size may change during the course of the amendment | |
398 | * operation */ | |
399 | typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, | |
8b13976d | 400 | int64_t total_work_size, void *opaque); |
77485434 | 401 | int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, |
d1402b50 HR |
402 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
403 | Error **errp); | |
6f176b48 | 404 | |
f6186f49 | 405 | /* external snapshots */ |
212a5a8f BC |
406 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
407 | BlockDriverState *candidate); | |
408 | bool bdrv_is_first_non_filter(BlockDriverState *candidate); | |
f6186f49 | 409 | |
09158f00 | 410 | /* check if a named node can be replaced when doing drive-mirror */ |
e12f3784 WC |
411 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
412 | const char *node_name, Error **errp); | |
09158f00 | 413 | |
faf07963 | 414 | /* async block I/O */ |
7c84b1b8 MA |
415 | void bdrv_aio_cancel(BlockAIOCB *acb); |
416 | void bdrv_aio_cancel_async(BlockAIOCB *acb); | |
faf07963 | 417 | |
7d780669 | 418 | /* sg packet commands */ |
48af776a | 419 | int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); |
7d780669 | 420 | |
0f15423c | 421 | /* Invalidate any cached metadata used by image formats */ |
5a8a30db KW |
422 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); |
423 | void bdrv_invalidate_cache_all(Error **errp); | |
76b1c7fe | 424 | int bdrv_inactivate_all(void); |
0f15423c | 425 | |
faf07963 | 426 | /* Ensure contents are flushed to disk. */ |
205ef796 | 427 | int bdrv_flush(BlockDriverState *bs); |
07f07615 | 428 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs); |
4085f5c7 | 429 | int bdrv_flush_all(void); |
2bc93fed | 430 | void bdrv_close_all(void); |
5b98db0a | 431 | void bdrv_drain(BlockDriverState *bs); |
a77fd4bb | 432 | void coroutine_fn bdrv_co_drain(BlockDriverState *bs); |
c0778f66 AG |
433 | void bdrv_drain_all_begin(void); |
434 | void bdrv_drain_all_end(void); | |
922453bc | 435 | void bdrv_drain_all(void); |
c6ca28d6 | 436 | |
88b062c2 | 437 | #define BDRV_POLL_WHILE(bs, cond) ({ \ |
88b062c2 | 438 | BlockDriverState *bs_ = (bs); \ |
cfe29d82 | 439 | AIO_WAIT_WHILE(bdrv_get_aio_context(bs_), \ |
7719f3c9 | 440 | cond); }) |
88b062c2 | 441 | |
d93e5726 VSO |
442 | int bdrv_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes); |
443 | int bdrv_co_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes); | |
3ac21627 | 444 | int bdrv_has_zero_init_1(BlockDriverState *bs); |
f2feebbd | 445 | int bdrv_has_zero_init(BlockDriverState *bs); |
ceaca56f | 446 | int bdrv_has_zero_init_truncate(BlockDriverState *bs); |
4ce78691 PL |
447 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); |
448 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); | |
237d78f8 EB |
449 | int bdrv_block_status(BlockDriverState *bs, int64_t offset, |
450 | int64_t bytes, int64_t *pnum, int64_t *map, | |
451 | BlockDriverState **file); | |
31826642 EB |
452 | int bdrv_block_status_above(BlockDriverState *bs, BlockDriverState *base, |
453 | int64_t offset, int64_t bytes, int64_t *pnum, | |
454 | int64_t *map, BlockDriverState **file); | |
d6a644bb EB |
455 | int bdrv_is_allocated(BlockDriverState *bs, int64_t offset, int64_t bytes, |
456 | int64_t *pnum); | |
b35b2bba | 457 | int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, |
170d3bd3 AS |
458 | bool include_base, int64_t offset, int64_t bytes, |
459 | int64_t *pnum); | |
faf07963 | 460 | |
54115412 | 461 | bool bdrv_is_read_only(BlockDriverState *bs); |
54a32bfe KW |
462 | int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
463 | bool ignore_allow_rdw, Error **errp); | |
eaa2410f KW |
464 | int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, |
465 | Error **errp); | |
cc022140 | 466 | bool bdrv_is_writable(BlockDriverState *bs); |
54115412 | 467 | bool bdrv_is_sg(BlockDriverState *bs); |
e031f750 | 468 | bool bdrv_is_inserted(BlockDriverState *bs); |
025e849a | 469 | void bdrv_lock_medium(BlockDriverState *bs, bool locked); |
f36f3949 | 470 | void bdrv_eject(BlockDriverState *bs, bool eject_flag); |
f8d6bba1 | 471 | const char *bdrv_get_format_name(BlockDriverState *bs); |
dc364f4c | 472 | BlockDriverState *bdrv_find_node(const char *node_name); |
d5a8ee60 | 473 | BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); |
5d3b4e99 | 474 | XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp); |
12d3ba82 BC |
475 | BlockDriverState *bdrv_lookup_bs(const char *device, |
476 | const char *node_name, | |
477 | Error **errp); | |
5a6684d2 | 478 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); |
04df765a | 479 | BlockDriverState *bdrv_next_node(BlockDriverState *bs); |
0f12264e | 480 | BlockDriverState *bdrv_next_all_states(BlockDriverState *bs); |
88be7b4b KW |
481 | |
482 | typedef struct BdrvNextIterator { | |
483 | enum { | |
484 | BDRV_NEXT_BACKEND_ROOTS, | |
485 | BDRV_NEXT_MONITOR_OWNED, | |
486 | } phase; | |
487 | BlockBackend *blk; | |
488 | BlockDriverState *bs; | |
489 | } BdrvNextIterator; | |
490 | ||
491 | BlockDriverState *bdrv_first(BdrvNextIterator *it); | |
492 | BlockDriverState *bdrv_next(BdrvNextIterator *it); | |
5e003f17 | 493 | void bdrv_next_cleanup(BdrvNextIterator *it); |
88be7b4b | 494 | |
262b4e8f | 495 | BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); |
54115412 | 496 | bool bdrv_is_encrypted(BlockDriverState *bs); |
faf07963 | 497 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
9ac404c5 | 498 | void *opaque, bool read_only); |
20a9e77d | 499 | const char *bdrv_get_node_name(const BlockDriverState *bs); |
bfb197e0 | 500 | const char *bdrv_get_device_name(const BlockDriverState *bs); |
9b2aa84f | 501 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); |
c8433287 | 502 | int bdrv_get_flags(BlockDriverState *bs); |
faf07963 | 503 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); |
1bf6e9ca AS |
504 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
505 | Error **errp); | |
343bded4 | 506 | void bdrv_round_to_clusters(BlockDriverState *bs, |
7cfd5275 | 507 | int64_t offset, int64_t bytes, |
244483e6 | 508 | int64_t *cluster_offset, |
7cfd5275 | 509 | int64_t *cluster_bytes); |
faf07963 PB |
510 | |
511 | void bdrv_get_backing_filename(BlockDriverState *bs, | |
512 | char *filename, int filename_size); | |
6b6833c1 | 513 | char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp); |
645ae7d8 HR |
514 | char *bdrv_get_full_backing_filename_from_filename(const char *backed, |
515 | const char *backing, | |
516 | Error **errp); | |
1e89d0f9 | 517 | char *bdrv_dirname(BlockDriverState *bs, Error **errp); |
faf07963 | 518 | |
5c98415b | 519 | int path_has_protocol(const char *path); |
faf07963 | 520 | int path_is_absolute(const char *path); |
009b03aa | 521 | char *path_combine(const char *base_path, const char *filename); |
faf07963 | 522 | |
5ddda0b8 | 523 | int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); |
cf8074b3 | 524 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); |
45566e9c CH |
525 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
526 | int64_t pos, int size); | |
178e08a5 | 527 | |
45566e9c CH |
528 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
529 | int64_t pos, int size); | |
178e08a5 | 530 | |
d92ada22 LC |
531 | void bdrv_img_create(const char *filename, const char *fmt, |
532 | const char *base_filename, const char *base_fmt, | |
f382d43a | 533 | char *options, uint64_t img_size, int flags, |
9217283d | 534 | bool quiet, Error **errp); |
f88e1a42 | 535 | |
339064d5 KW |
536 | /* Returns the alignment in bytes that is required so that no bounce buffer |
537 | * is required throughout the stack */ | |
4196d2f0 DL |
538 | size_t bdrv_min_mem_align(BlockDriverState *bs); |
539 | /* Returns optimal alignment in bytes for bounce buffer */ | |
339064d5 | 540 | size_t bdrv_opt_mem_align(BlockDriverState *bs); |
ba5b7ad4 | 541 | void *qemu_blockalign(BlockDriverState *bs, size_t size); |
9ebd8448 | 542 | void *qemu_blockalign0(BlockDriverState *bs, size_t size); |
7d2a35cc | 543 | void *qemu_try_blockalign(BlockDriverState *bs, size_t size); |
9ebd8448 | 544 | void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); |
c53b1c51 | 545 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); |
ba5b7ad4 | 546 | |
53fec9d3 SH |
547 | void bdrv_enable_copy_on_read(BlockDriverState *bs); |
548 | void bdrv_disable_copy_on_read(BlockDriverState *bs); | |
549 | ||
9fcb0251 FZ |
550 | void bdrv_ref(BlockDriverState *bs); |
551 | void bdrv_unref(BlockDriverState *bs); | |
33a60407 | 552 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); |
98292c61 WC |
553 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
554 | BlockDriverState *child_bs, | |
555 | const char *child_name, | |
8b2ff529 KW |
556 | const BdrvChildRole *child_role, |
557 | Error **errp); | |
8b9b0cc2 | 558 | |
fbe40ff7 FZ |
559 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); |
560 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); | |
561 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); | |
562 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason); | |
563 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); | |
564 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs); | |
565 | ||
9a4f4c31 KW |
566 | #define BLKDBG_EVENT(child, evt) \ |
567 | do { \ | |
568 | if (child) { \ | |
569 | bdrv_debug_event(child->bs, evt); \ | |
570 | } \ | |
571 | } while (0) | |
572 | ||
a31939e6 | 573 | void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); |
8b9b0cc2 | 574 | |
41c695c7 KW |
575 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
576 | const char *tag); | |
4cc70e93 | 577 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); |
41c695c7 KW |
578 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag); |
579 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); | |
580 | ||
db519cba FZ |
581 | /** |
582 | * bdrv_get_aio_context: | |
583 | * | |
584 | * Returns: the currently bound #AioContext | |
585 | */ | |
586 | AioContext *bdrv_get_aio_context(BlockDriverState *bs); | |
587 | ||
052a7572 FZ |
588 | /** |
589 | * Transfer control to @co in the aio context of @bs | |
590 | */ | |
591 | void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); | |
592 | ||
53a7d041 KW |
593 | void bdrv_set_aio_context_ignore(BlockDriverState *bs, |
594 | AioContext *new_context, GSList **ignore); | |
5d231849 KW |
595 | int bdrv_try_set_aio_context(BlockDriverState *bs, AioContext *ctx, |
596 | Error **errp); | |
597 | int bdrv_child_try_set_aio_context(BlockDriverState *bs, AioContext *ctx, | |
598 | BdrvChild *ignore_child, Error **errp); | |
599 | bool bdrv_child_can_set_aio_context(BdrvChild *c, AioContext *ctx, | |
600 | GSList **ignore, Error **errp); | |
601 | bool bdrv_can_set_aio_context(BlockDriverState *bs, AioContext *ctx, | |
602 | GSList **ignore, Error **errp); | |
892b7de8 ET |
603 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); |
604 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); | |
dcd04228 | 605 | |
448ad91d ML |
606 | void bdrv_io_plug(BlockDriverState *bs); |
607 | void bdrv_io_unplug(BlockDriverState *bs); | |
448ad91d | 608 | |
4be6a6d1 KW |
609 | /** |
610 | * bdrv_parent_drained_begin_single: | |
611 | * | |
612 | * Begin a quiesced section for the parent of @c. If @poll is true, wait for | |
613 | * any pending activity to cease. | |
614 | */ | |
615 | void bdrv_parent_drained_begin_single(BdrvChild *c, bool poll); | |
616 | ||
804db8ea HR |
617 | /** |
618 | * bdrv_parent_drained_end_single: | |
619 | * | |
620 | * End a quiesced section for the parent of @c. | |
e037c09c HR |
621 | * |
622 | * This polls @bs's AioContext until all scheduled sub-drained_ends | |
623 | * have settled, which may result in graph changes. | |
804db8ea HR |
624 | */ |
625 | void bdrv_parent_drained_end_single(BdrvChild *c); | |
626 | ||
89bd0305 KW |
627 | /** |
628 | * bdrv_drain_poll: | |
629 | * | |
fe4f0614 | 630 | * Poll for pending requests in @bs, its parents (except for @ignore_parent), |
6cd5c9d7 KW |
631 | * and if @recursive is true its children as well (used for subtree drain). |
632 | * | |
633 | * If @ignore_bds_parents is true, parents that are BlockDriverStates must | |
634 | * ignore the drain request because they will be drained separately (used for | |
635 | * drain_all). | |
fe4f0614 KW |
636 | * |
637 | * This is part of bdrv_drained_begin. | |
89bd0305 | 638 | */ |
fe4f0614 | 639 | bool bdrv_drain_poll(BlockDriverState *bs, bool recursive, |
6cd5c9d7 | 640 | BdrvChild *ignore_parent, bool ignore_bds_parents); |
89bd0305 | 641 | |
51288d79 FZ |
642 | /** |
643 | * bdrv_drained_begin: | |
644 | * | |
645 | * Begin a quiesced section for exclusive access to the BDS, by disabling | |
646 | * external request sources including NBD server and device model. Note that | |
647 | * this doesn't block timers or coroutines from submitting more requests, which | |
648 | * means block_job_pause is still necessary. | |
649 | * | |
650 | * This function can be recursive. | |
651 | */ | |
652 | void bdrv_drained_begin(BlockDriverState *bs); | |
653 | ||
dcf94a23 KW |
654 | /** |
655 | * bdrv_do_drained_begin_quiesce: | |
656 | * | |
657 | * Quiesces a BDS like bdrv_drained_begin(), but does not wait for already | |
658 | * running requests to complete. | |
659 | */ | |
660 | void bdrv_do_drained_begin_quiesce(BlockDriverState *bs, | |
6cd5c9d7 | 661 | BdrvChild *parent, bool ignore_bds_parents); |
dcf94a23 | 662 | |
b0165585 KW |
663 | /** |
664 | * Like bdrv_drained_begin, but recursively begins a quiesced section for | |
665 | * exclusive access to all child nodes as well. | |
b0165585 KW |
666 | */ |
667 | void bdrv_subtree_drained_begin(BlockDriverState *bs); | |
668 | ||
51288d79 FZ |
669 | /** |
670 | * bdrv_drained_end: | |
671 | * | |
672 | * End a quiescent section started by bdrv_drained_begin(). | |
e037c09c HR |
673 | * |
674 | * This polls @bs's AioContext until all scheduled sub-drained_ends | |
675 | * have settled. On one hand, that may result in graph changes. On | |
43eaaaef HR |
676 | * the other, this requires that the caller either runs in the main |
677 | * loop; or that all involved nodes (@bs and all of its parents) are | |
678 | * in the caller's AioContext. | |
51288d79 FZ |
679 | */ |
680 | void bdrv_drained_end(BlockDriverState *bs); | |
681 | ||
e037c09c HR |
682 | /** |
683 | * bdrv_drained_end_no_poll: | |
684 | * | |
685 | * Same as bdrv_drained_end(), but do not poll for the subgraph to | |
686 | * actually become unquiesced. Therefore, no graph changes will occur | |
687 | * with this function. | |
688 | * | |
689 | * *drained_end_counter is incremented for every background operation | |
690 | * that is scheduled, and will be decremented for every operation once | |
691 | * it settles. The caller must poll until it reaches 0. The counter | |
692 | * should be accessed using atomic operations only. | |
693 | */ | |
694 | void bdrv_drained_end_no_poll(BlockDriverState *bs, int *drained_end_counter); | |
695 | ||
b0165585 KW |
696 | /** |
697 | * End a quiescent section started by bdrv_subtree_drained_begin(). | |
698 | */ | |
699 | void bdrv_subtree_drained_end(BlockDriverState *bs); | |
700 | ||
e06018ad WC |
701 | void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, |
702 | Error **errp); | |
703 | void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); | |
704 | ||
67b792f5 VSO |
705 | bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, |
706 | uint32_t granularity, Error **errp); | |
23d0ba93 FZ |
707 | /** |
708 | * | |
709 | * bdrv_register_buf/bdrv_unregister_buf: | |
710 | * | |
711 | * Register/unregister a buffer for I/O. For example, VFIO drivers are | |
712 | * interested to know the memory areas that would later be used for I/O, so | |
713 | * that they can prepare IOMMU mapping etc., to get better performance. | |
714 | */ | |
715 | void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size); | |
716 | void bdrv_unregister_buf(BlockDriverState *bs, void *host); | |
fcc67678 FZ |
717 | |
718 | /** | |
719 | * | |
720 | * bdrv_co_copy_range: | |
721 | * | |
722 | * Do offloaded copy between two children. If the operation is not implemented | |
723 | * by the driver, or if the backend storage doesn't support it, a negative | |
724 | * error code will be returned. | |
725 | * | |
726 | * Note: block layer doesn't emulate or fallback to a bounce buffer approach | |
727 | * because usually the caller shouldn't attempt offloaded copy any more (e.g. | |
728 | * calling copy_file_range(2)) after the first error, thus it should fall back | |
729 | * to a read+write path in the caller level. | |
730 | * | |
731 | * @src: Source child to copy data from | |
732 | * @src_offset: offset in @src image to read data | |
733 | * @dst: Destination child to copy data to | |
734 | * @dst_offset: offset in @dst image to write data | |
735 | * @bytes: number of bytes to copy | |
dee12de8 | 736 | * @flags: request flags. Supported flags: |
fcc67678 FZ |
737 | * BDRV_REQ_ZERO_WRITE - treat the @src range as zero data and do zero |
738 | * write on @dst as if bdrv_co_pwrite_zeroes is | |
739 | * called. Used to simplify caller code, or | |
740 | * during BlockDriver.bdrv_co_copy_range_from() | |
741 | * recursion. | |
dee12de8 FZ |
742 | * BDRV_REQ_NO_SERIALISING - do not serialize with other overlapping |
743 | * requests currently in flight. | |
fcc67678 FZ |
744 | * |
745 | * Returns: 0 if succeeded; negative error code if failed. | |
746 | **/ | |
747 | int coroutine_fn bdrv_co_copy_range(BdrvChild *src, uint64_t src_offset, | |
748 | BdrvChild *dst, uint64_t dst_offset, | |
67b51fb9 VSO |
749 | uint64_t bytes, BdrvRequestFlags read_flags, |
750 | BdrvRequestFlags write_flags); | |
8a4bc5aa | 751 | #endif |