xref: /openbmc/qemu/include/block/block.h (revision 93f7c4f0)
1 #ifndef BLOCK_H
2 #define BLOCK_H
3 
4 #include "block/aio.h"
5 #include "qemu-common.h"
6 #include "qemu/option.h"
7 #include "block/coroutine.h"
8 #include "block/accounting.h"
9 #include "qapi/qmp/qobject.h"
10 #include "qapi-types.h"
11 
12 /* block.c */
13 typedef struct BlockDriver BlockDriver;
14 typedef struct BlockJob BlockJob;
15 
16 typedef struct BlockDriverInfo {
17     /* in bytes, 0 if irrelevant */
18     int cluster_size;
19     /* offset at which the VM state can be saved (0 if not possible) */
20     int64_t vm_state_offset;
21     bool is_dirty;
22     /*
23      * True if unallocated blocks read back as zeroes. This is equivalent
24      * to the the LBPRZ flag in the SCSI logical block provisioning page.
25      */
26     bool unallocated_blocks_are_zero;
27     /*
28      * True if the driver can optimize writing zeroes by unmapping
29      * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
30      * with the difference that in qemu a discard is allowed to silently
31      * fail. Therefore we have to use bdrv_write_zeroes with the
32      * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
33      * After this call the driver has to guarantee that the contents read
34      * back as zero. It is additionally required that the block device is
35      * opened with BDRV_O_UNMAP flag for this to work.
36      */
37     bool can_write_zeroes_with_unmap;
38     /*
39      * True if this block driver only supports compressed writes
40      */
41     bool needs_compressed_writes;
42 } BlockDriverInfo;
43 
44 typedef struct BlockFragInfo {
45     uint64_t allocated_clusters;
46     uint64_t total_clusters;
47     uint64_t fragmented_clusters;
48     uint64_t compressed_clusters;
49 } BlockFragInfo;
50 
51 typedef enum {
52     BDRV_REQ_COPY_ON_READ = 0x1,
53     BDRV_REQ_ZERO_WRITE   = 0x2,
54     /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
55      * is allowed to optimize a write zeroes request by unmapping (discarding)
56      * blocks if it is guaranteed that the result will read back as
57      * zeroes. The flag is only passed to the driver if the block device is
58      * opened with BDRV_O_UNMAP.
59      */
60     BDRV_REQ_MAY_UNMAP    = 0x4,
61 } BdrvRequestFlags;
62 
63 typedef struct BlockSizes {
64     uint32_t phys;
65     uint32_t log;
66 } BlockSizes;
67 
68 typedef struct HDGeometry {
69     uint32_t heads;
70     uint32_t sectors;
71     uint32_t cylinders;
72 } HDGeometry;
73 
74 #define BDRV_O_RDWR        0x0002
75 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
76 #define BDRV_O_TEMPORARY   0x0010 /* delete the file after use */
77 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
78 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
79 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
80 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
81 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
82 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
83 #define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
84 #define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
85 #define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
86 #define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */
87 #define BDRV_O_PROTOCOL    0x8000  /* if no block driver is explicitly given:
88                                       select an appropriate protocol driver,
89                                       ignoring the format layer */
90 
91 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
92 
93 #define BDRV_SECTOR_BITS   9
94 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
95 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
96 
97 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
98                                      INT_MAX >> BDRV_SECTOR_BITS)
99 
100 /*
101  * Allocation status flags
102  * BDRV_BLOCK_DATA: data is read from bs->file or another file
103  * BDRV_BLOCK_ZERO: sectors read as zero
104  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
105  * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
106  *                       layer (as opposed to the backing file)
107  * BDRV_BLOCK_RAW: used internally to indicate that the request
108  *                 was answered by the raw driver and that one
109  *                 should look in bs->file directly.
110  *
111  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
112  * bs->file where sector data can be read from as raw data.
113  *
114  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
115  *
116  * DATA ZERO OFFSET_VALID
117  *  t    t        t       sectors read as zero, bs->file is zero at offset
118  *  t    f        t       sectors read as valid from bs->file at offset
119  *  f    t        t       sectors preallocated, read as zero, bs->file not
120  *                        necessarily zero at offset
121  *  f    f        t       sectors preallocated but read from backing_hd,
122  *                        bs->file contains garbage at offset
123  *  t    t        f       sectors preallocated, read as zero, unknown offset
124  *  t    f        f       sectors read from unknown file or offset
125  *  f    t        f       not allocated or unknown offset, read as zero
126  *  f    f        f       not allocated or unknown offset, read from backing_hd
127  */
128 #define BDRV_BLOCK_DATA         0x01
129 #define BDRV_BLOCK_ZERO         0x02
130 #define BDRV_BLOCK_OFFSET_VALID 0x04
131 #define BDRV_BLOCK_RAW          0x08
132 #define BDRV_BLOCK_ALLOCATED    0x10
133 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
134 
135 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
136 
137 typedef struct BDRVReopenState {
138     BlockDriverState *bs;
139     int flags;
140     void *opaque;
141 } BDRVReopenState;
142 
143 /*
144  * Block operation types
145  */
146 typedef enum BlockOpType {
147     BLOCK_OP_TYPE_BACKUP_SOURCE,
148     BLOCK_OP_TYPE_BACKUP_TARGET,
149     BLOCK_OP_TYPE_CHANGE,
150     BLOCK_OP_TYPE_COMMIT_SOURCE,
151     BLOCK_OP_TYPE_COMMIT_TARGET,
152     BLOCK_OP_TYPE_DATAPLANE,
153     BLOCK_OP_TYPE_DRIVE_DEL,
154     BLOCK_OP_TYPE_EJECT,
155     BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
156     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT,
157     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
158     BLOCK_OP_TYPE_MIRROR,
159     BLOCK_OP_TYPE_RESIZE,
160     BLOCK_OP_TYPE_STREAM,
161     BLOCK_OP_TYPE_REPLACE,
162     BLOCK_OP_TYPE_MAX,
163 } BlockOpType;
164 
165 void bdrv_iostatus_enable(BlockDriverState *bs);
166 void bdrv_iostatus_reset(BlockDriverState *bs);
167 void bdrv_iostatus_disable(BlockDriverState *bs);
168 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
169 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
170 void bdrv_info_print(Monitor *mon, const QObject *data);
171 void bdrv_info(Monitor *mon, QObject **ret_data);
172 void bdrv_stats_print(Monitor *mon, const QObject *data);
173 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
174 
175 /* disk I/O throttling */
176 void bdrv_io_limits_enable(BlockDriverState *bs);
177 void bdrv_io_limits_disable(BlockDriverState *bs);
178 
179 void bdrv_init(void);
180 void bdrv_init_with_whitelist(void);
181 BlockDriver *bdrv_find_protocol(const char *filename,
182                                 bool allow_protocol_prefix,
183                                 Error **errp);
184 BlockDriver *bdrv_find_format(const char *format_name);
185 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
186                                           bool readonly);
187 int bdrv_create(BlockDriver *drv, const char* filename,
188                 QemuOpts *opts, Error **errp);
189 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
190 BlockDriverState *bdrv_new_root(void);
191 BlockDriverState *bdrv_new(void);
192 void bdrv_make_anon(BlockDriverState *bs);
193 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
194 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
195 int bdrv_parse_cache_flags(const char *mode, int *flags);
196 int bdrv_parse_discard_flags(const char *mode, int *flags);
197 int bdrv_open_image(BlockDriverState **pbs, const char *filename,
198                     QDict *options, const char *bdref_key, int flags,
199                     bool allow_none, Error **errp);
200 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd);
201 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
202 int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp);
203 int bdrv_open(BlockDriverState **pbs, const char *filename,
204               const char *reference, QDict *options, int flags,
205               BlockDriver *drv, Error **errp);
206 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
207                                     BlockDriverState *bs, int flags);
208 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
209 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
210 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
211                         BlockReopenQueue *queue, Error **errp);
212 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
213 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
214 void bdrv_close(BlockDriverState *bs);
215 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
216 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
217               uint8_t *buf, int nb_sectors);
218 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
219                           uint8_t *buf, int nb_sectors);
220 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
221                const uint8_t *buf, int nb_sectors);
222 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
223                int nb_sectors, BdrvRequestFlags flags);
224 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
225                                   int nb_sectors, BdrvRequestFlags flags,
226                                   BlockCompletionFunc *cb, void *opaque);
227 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
228 int bdrv_pread(BlockDriverState *bs, int64_t offset,
229                void *buf, int count);
230 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
231                 const void *buf, int count);
232 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
233 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
234     const void *buf, int count);
235 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
236     int nb_sectors, QEMUIOVector *qiov);
237 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
238     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
239 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
240     int nb_sectors, QEMUIOVector *qiov);
241 /*
242  * Efficiently zero a region of the disk image.  Note that this is a regular
243  * I/O request like read or write and should have a reasonable size.  This
244  * function is not suitable for zeroing the entire image in a single request
245  * because it may allocate memory for the entire region.
246  */
247 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
248     int nb_sectors, BdrvRequestFlags flags);
249 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
250     const char *backing_file);
251 int bdrv_get_backing_file_depth(BlockDriverState *bs);
252 void bdrv_refresh_filename(BlockDriverState *bs);
253 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
254 int64_t bdrv_nb_sectors(BlockDriverState *bs);
255 int64_t bdrv_getlength(BlockDriverState *bs);
256 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
257 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
258 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp);
259 int bdrv_commit(BlockDriverState *bs);
260 int bdrv_commit_all(void);
261 int bdrv_change_backing_file(BlockDriverState *bs,
262     const char *backing_file, const char *backing_fmt);
263 void bdrv_register(BlockDriver *bdrv);
264 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
265                            BlockDriverState *base,
266                            const char *backing_file_str);
267 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
268                                     BlockDriverState *bs);
269 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
270 
271 
272 typedef struct BdrvCheckResult {
273     int corruptions;
274     int leaks;
275     int check_errors;
276     int corruptions_fixed;
277     int leaks_fixed;
278     int64_t image_end_offset;
279     BlockFragInfo bfi;
280 } BdrvCheckResult;
281 
282 typedef enum {
283     BDRV_FIX_LEAKS    = 1,
284     BDRV_FIX_ERRORS   = 2,
285 } BdrvCheckMode;
286 
287 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
288 
289 /* The units of offset and total_work_size may be chosen arbitrarily by the
290  * block driver; total_work_size may change during the course of the amendment
291  * operation */
292 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset,
293                                       int64_t total_work_size);
294 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
295                        BlockDriverAmendStatusCB *status_cb);
296 
297 /* external snapshots */
298 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
299                                       BlockDriverState *candidate);
300 bool bdrv_is_first_non_filter(BlockDriverState *candidate);
301 
302 /* check if a named node can be replaced when doing drive-mirror */
303 BlockDriverState *check_to_replace_node(const char *node_name, Error **errp);
304 
305 /* async block I/O */
306 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
307                                      int sector_num);
308 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
309                            QEMUIOVector *iov, int nb_sectors,
310                            BlockCompletionFunc *cb, void *opaque);
311 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
312                             QEMUIOVector *iov, int nb_sectors,
313                             BlockCompletionFunc *cb, void *opaque);
314 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
315                            BlockCompletionFunc *cb, void *opaque);
316 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
317                              int64_t sector_num, int nb_sectors,
318                              BlockCompletionFunc *cb, void *opaque);
319 void bdrv_aio_cancel(BlockAIOCB *acb);
320 void bdrv_aio_cancel_async(BlockAIOCB *acb);
321 
322 typedef struct BlockRequest {
323     /* Fields to be filled by multiwrite caller */
324     int64_t sector;
325     int nb_sectors;
326     int flags;
327     QEMUIOVector *qiov;
328     BlockCompletionFunc *cb;
329     void *opaque;
330 
331     /* Filled by multiwrite implementation */
332     int error;
333 } BlockRequest;
334 
335 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
336     int num_reqs);
337 
338 /* sg packet commands */
339 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
340 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
341         unsigned long int req, void *buf,
342         BlockCompletionFunc *cb, void *opaque);
343 
344 /* Invalidate any cached metadata used by image formats */
345 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
346 void bdrv_invalidate_cache_all(Error **errp);
347 
348 /* Ensure contents are flushed to disk.  */
349 int bdrv_flush(BlockDriverState *bs);
350 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
351 int bdrv_flush_all(void);
352 void bdrv_close_all(void);
353 void bdrv_drain(BlockDriverState *bs);
354 void bdrv_drain_all(void);
355 
356 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
357 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
358 int bdrv_has_zero_init_1(BlockDriverState *bs);
359 int bdrv_has_zero_init(BlockDriverState *bs);
360 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
361 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
362 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
363                               int nb_sectors, int *pnum);
364 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
365                       int *pnum);
366 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
367                             int64_t sector_num, int nb_sectors, int *pnum);
368 
369 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
370                        BlockdevOnError on_write_error);
371 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
372 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
373 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
374                        bool is_read, int error);
375 int bdrv_is_read_only(BlockDriverState *bs);
376 int bdrv_is_sg(BlockDriverState *bs);
377 int bdrv_enable_write_cache(BlockDriverState *bs);
378 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
379 int bdrv_is_inserted(BlockDriverState *bs);
380 int bdrv_media_changed(BlockDriverState *bs);
381 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
382 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
383 const char *bdrv_get_format_name(BlockDriverState *bs);
384 BlockDriverState *bdrv_find(const char *name);
385 BlockDriverState *bdrv_find_node(const char *node_name);
386 BlockDeviceInfoList *bdrv_named_nodes_list(void);
387 BlockDriverState *bdrv_lookup_bs(const char *device,
388                                  const char *node_name,
389                                  Error **errp);
390 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
391 BlockDriverState *bdrv_next_node(BlockDriverState *bs);
392 BlockDriverState *bdrv_next(BlockDriverState *bs);
393 int bdrv_is_encrypted(BlockDriverState *bs);
394 int bdrv_key_required(BlockDriverState *bs);
395 int bdrv_set_key(BlockDriverState *bs, const char *key);
396 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp);
397 int bdrv_query_missing_keys(void);
398 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
399                          void *opaque);
400 const char *bdrv_get_node_name(const BlockDriverState *bs);
401 const char *bdrv_get_device_name(const BlockDriverState *bs);
402 int bdrv_get_flags(BlockDriverState *bs);
403 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
404                           const uint8_t *buf, int nb_sectors);
405 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
406 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
407 void bdrv_round_to_clusters(BlockDriverState *bs,
408                             int64_t sector_num, int nb_sectors,
409                             int64_t *cluster_sector_num,
410                             int *cluster_nb_sectors);
411 
412 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
413 void bdrv_get_backing_filename(BlockDriverState *bs,
414                                char *filename, int filename_size);
415 void bdrv_get_full_backing_filename(BlockDriverState *bs,
416                                     char *dest, size_t sz, Error **errp);
417 void bdrv_get_full_backing_filename_from_filename(const char *backed,
418                                                   const char *backing,
419                                                   char *dest, size_t sz,
420                                                   Error **errp);
421 int bdrv_is_snapshot(BlockDriverState *bs);
422 
423 int path_has_protocol(const char *path);
424 int path_is_absolute(const char *path);
425 void path_combine(char *dest, int dest_size,
426                   const char *base_path,
427                   const char *filename);
428 
429 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
430 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
431                       int64_t pos, int size);
432 
433 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
434                       int64_t pos, int size);
435 
436 void bdrv_img_create(const char *filename, const char *fmt,
437                      const char *base_filename, const char *base_fmt,
438                      char *options, uint64_t img_size, int flags,
439                      Error **errp, bool quiet);
440 
441 /* Returns the alignment in bytes that is required so that no bounce buffer
442  * is required throughout the stack */
443 size_t bdrv_opt_mem_align(BlockDriverState *bs);
444 void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
445 void *qemu_blockalign(BlockDriverState *bs, size_t size);
446 void *qemu_blockalign0(BlockDriverState *bs, size_t size);
447 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
448 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
449 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
450 
451 struct HBitmapIter;
452 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
453 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
454                                           Error **errp);
455 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
456 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
457 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
458 void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
459                            int64_t cur_sector, int nr_sectors);
460 void bdrv_reset_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
461                              int64_t cur_sector, int nr_sectors);
462 void bdrv_dirty_iter_init(BlockDriverState *bs,
463                           BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
464 int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
465 
466 void bdrv_enable_copy_on_read(BlockDriverState *bs);
467 void bdrv_disable_copy_on_read(BlockDriverState *bs);
468 
469 void bdrv_ref(BlockDriverState *bs);
470 void bdrv_unref(BlockDriverState *bs);
471 
472 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp);
473 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason);
474 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason);
475 void bdrv_op_block_all(BlockDriverState *bs, Error *reason);
476 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason);
477 bool bdrv_op_blocker_is_empty(BlockDriverState *bs);
478 
479 typedef enum {
480     BLKDBG_L1_UPDATE,
481 
482     BLKDBG_L1_GROW_ALLOC_TABLE,
483     BLKDBG_L1_GROW_WRITE_TABLE,
484     BLKDBG_L1_GROW_ACTIVATE_TABLE,
485 
486     BLKDBG_L2_LOAD,
487     BLKDBG_L2_UPDATE,
488     BLKDBG_L2_UPDATE_COMPRESSED,
489     BLKDBG_L2_ALLOC_COW_READ,
490     BLKDBG_L2_ALLOC_WRITE,
491 
492     BLKDBG_READ_AIO,
493     BLKDBG_READ_BACKING_AIO,
494     BLKDBG_READ_COMPRESSED,
495 
496     BLKDBG_WRITE_AIO,
497     BLKDBG_WRITE_COMPRESSED,
498 
499     BLKDBG_VMSTATE_LOAD,
500     BLKDBG_VMSTATE_SAVE,
501 
502     BLKDBG_COW_READ,
503     BLKDBG_COW_WRITE,
504 
505     BLKDBG_REFTABLE_LOAD,
506     BLKDBG_REFTABLE_GROW,
507     BLKDBG_REFTABLE_UPDATE,
508 
509     BLKDBG_REFBLOCK_LOAD,
510     BLKDBG_REFBLOCK_UPDATE,
511     BLKDBG_REFBLOCK_UPDATE_PART,
512     BLKDBG_REFBLOCK_ALLOC,
513     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
514     BLKDBG_REFBLOCK_ALLOC_WRITE,
515     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
516     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
517     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
518 
519     BLKDBG_CLUSTER_ALLOC,
520     BLKDBG_CLUSTER_ALLOC_BYTES,
521     BLKDBG_CLUSTER_FREE,
522 
523     BLKDBG_FLUSH_TO_OS,
524     BLKDBG_FLUSH_TO_DISK,
525 
526     BLKDBG_PWRITEV_RMW_HEAD,
527     BLKDBG_PWRITEV_RMW_AFTER_HEAD,
528     BLKDBG_PWRITEV_RMW_TAIL,
529     BLKDBG_PWRITEV_RMW_AFTER_TAIL,
530     BLKDBG_PWRITEV,
531     BLKDBG_PWRITEV_ZERO,
532     BLKDBG_PWRITEV_DONE,
533 
534     BLKDBG_EMPTY_IMAGE_PREPARE,
535 
536     BLKDBG_EVENT_MAX,
537 } BlkDebugEvent;
538 
539 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
540 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
541 
542 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
543                            const char *tag);
544 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
545 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
546 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
547 
548 /**
549  * bdrv_get_aio_context:
550  *
551  * Returns: the currently bound #AioContext
552  */
553 AioContext *bdrv_get_aio_context(BlockDriverState *bs);
554 
555 /**
556  * bdrv_set_aio_context:
557  *
558  * Changes the #AioContext used for fd handlers, timers, and BHs by this
559  * BlockDriverState and all its children.
560  *
561  * This function must be called with iothread lock held.
562  */
563 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
564 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz);
565 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo);
566 
567 void bdrv_io_plug(BlockDriverState *bs);
568 void bdrv_io_unplug(BlockDriverState *bs);
569 void bdrv_flush_io_queue(BlockDriverState *bs);
570 
571 BlockAcctStats *bdrv_get_stats(BlockDriverState *bs);
572 
573 #endif
574