xref: /openbmc/qemu/include/block/block.h (revision 4a66d3bf)
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 "qapi/qmp/qobject.h"
9 #include "qapi-types.h"
10 
11 /* block.c */
12 typedef struct BlockDriver BlockDriver;
13 typedef struct BlockJob BlockJob;
14 
15 typedef struct BlockDriverInfo {
16     /* in bytes, 0 if irrelevant */
17     int cluster_size;
18     /* offset at which the VM state can be saved (0 if not possible) */
19     int64_t vm_state_offset;
20     bool is_dirty;
21     /*
22      * True if unallocated blocks read back as zeroes. This is equivalent
23      * to the the LBPRZ flag in the SCSI logical block provisioning page.
24      */
25     bool unallocated_blocks_are_zero;
26     /*
27      * True if the driver can optimize writing zeroes by unmapping
28      * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
29      * with the difference that in qemu a discard is allowed to silently
30      * fail. Therefore we have to use bdrv_write_zeroes with the
31      * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
32      * After this call the driver has to guarantee that the contents read
33      * back as zero. It is additionally required that the block device is
34      * opened with BDRV_O_UNMAP flag for this to work.
35      */
36     bool can_write_zeroes_with_unmap;
37 } BlockDriverInfo;
38 
39 typedef struct BlockFragInfo {
40     uint64_t allocated_clusters;
41     uint64_t total_clusters;
42     uint64_t fragmented_clusters;
43     uint64_t compressed_clusters;
44 } BlockFragInfo;
45 
46 /* Callbacks for block device models */
47 typedef struct BlockDevOps {
48     /*
49      * Runs when virtual media changed (monitor commands eject, change)
50      * Argument load is true on load and false on eject.
51      * Beware: doesn't run when a host device's physical media
52      * changes.  Sure would be useful if it did.
53      * Device models with removable media must implement this callback.
54      */
55     void (*change_media_cb)(void *opaque, bool load);
56     /*
57      * Runs when an eject request is issued from the monitor, the tray
58      * is closed, and the medium is locked.
59      * Device models that do not implement is_medium_locked will not need
60      * this callback.  Device models that can lock the medium or tray might
61      * want to implement the callback and unlock the tray when "force" is
62      * true, even if they do not support eject requests.
63      */
64     void (*eject_request_cb)(void *opaque, bool force);
65     /*
66      * Is the virtual tray open?
67      * Device models implement this only when the device has a tray.
68      */
69     bool (*is_tray_open)(void *opaque);
70     /*
71      * Is the virtual medium locked into the device?
72      * Device models implement this only when device has such a lock.
73      */
74     bool (*is_medium_locked)(void *opaque);
75     /*
76      * Runs when the size changed (e.g. monitor command block_resize)
77      */
78     void (*resize_cb)(void *opaque);
79 } BlockDevOps;
80 
81 typedef enum {
82     BDRV_REQ_COPY_ON_READ = 0x1,
83     BDRV_REQ_ZERO_WRITE   = 0x2,
84     /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
85      * is allowed to optimize a write zeroes request by unmapping (discarding)
86      * blocks if it is guaranteed that the result will read back as
87      * zeroes. The flag is only passed to the driver if the block device is
88      * opened with BDRV_O_UNMAP.
89      */
90     BDRV_REQ_MAY_UNMAP    = 0x4,
91 } BdrvRequestFlags;
92 
93 #define BDRV_O_RDWR        0x0002
94 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
95 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
96 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
97 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
98 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
99 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
100 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
101 #define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
102 #define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
103 #define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
104 #define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */
105 #define BDRV_O_PROTOCOL    0x8000  /* if no block driver is explicitly given:
106                                       select an appropriate protocol driver,
107                                       ignoring the format layer */
108 
109 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
110 
111 #define BDRV_SECTOR_BITS   9
112 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
113 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
114 
115 /* BDRV_BLOCK_DATA: data is read from bs->file or another file
116  * BDRV_BLOCK_ZERO: sectors read as zero
117  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
118  * BDRV_BLOCK_RAW: used internally to indicate that the request
119  *                 was answered by the raw driver and that one
120  *                 should look in bs->file directly.
121  *
122  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
123  * bs->file where sector data can be read from as raw data.
124  *
125  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
126  *
127  * DATA ZERO OFFSET_VALID
128  *  t    t        t       sectors read as zero, bs->file is zero at offset
129  *  t    f        t       sectors read as valid from bs->file at offset
130  *  f    t        t       sectors preallocated, read as zero, bs->file not
131  *                        necessarily zero at offset
132  *  f    f        t       sectors preallocated but read from backing_hd,
133  *                        bs->file contains garbage at offset
134  *  t    t        f       sectors preallocated, read as zero, unknown offset
135  *  t    f        f       sectors read from unknown file or offset
136  *  f    t        f       not allocated or unknown offset, read as zero
137  *  f    f        f       not allocated or unknown offset, read from backing_hd
138  */
139 #define BDRV_BLOCK_DATA         1
140 #define BDRV_BLOCK_ZERO         2
141 #define BDRV_BLOCK_OFFSET_VALID 4
142 #define BDRV_BLOCK_RAW          8
143 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
144 
145 typedef enum {
146     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
147 } BlockErrorAction;
148 
149 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
150 
151 typedef struct BDRVReopenState {
152     BlockDriverState *bs;
153     int flags;
154     void *opaque;
155 } BDRVReopenState;
156 
157 
158 void bdrv_iostatus_enable(BlockDriverState *bs);
159 void bdrv_iostatus_reset(BlockDriverState *bs);
160 void bdrv_iostatus_disable(BlockDriverState *bs);
161 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
162 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
163 void bdrv_info_print(Monitor *mon, const QObject *data);
164 void bdrv_info(Monitor *mon, QObject **ret_data);
165 void bdrv_stats_print(Monitor *mon, const QObject *data);
166 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
167 
168 /* disk I/O throttling */
169 void bdrv_io_limits_enable(BlockDriverState *bs);
170 void bdrv_io_limits_disable(BlockDriverState *bs);
171 
172 void bdrv_init(void);
173 void bdrv_init_with_whitelist(void);
174 BlockDriver *bdrv_find_protocol(const char *filename,
175                                 bool allow_protocol_prefix);
176 BlockDriver *bdrv_find_format(const char *format_name);
177 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
178                                           bool readonly);
179 int bdrv_create(BlockDriver *drv, const char* filename,
180     QEMUOptionParameter *options, Error **errp);
181 int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
182                      Error **errp);
183 BlockDriverState *bdrv_new(const char *device_name, Error **errp);
184 void bdrv_make_anon(BlockDriverState *bs);
185 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
186 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
187 int bdrv_parse_cache_flags(const char *mode, int *flags);
188 int bdrv_parse_discard_flags(const char *mode, int *flags);
189 int bdrv_open_image(BlockDriverState **pbs, const char *filename,
190                     QDict *options, const char *bdref_key, int flags,
191                     bool allow_none, Error **errp);
192 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
193 void bdrv_append_temp_snapshot(BlockDriverState *bs, Error **errp);
194 int bdrv_open(BlockDriverState **pbs, const char *filename,
195               const char *reference, QDict *options, int flags,
196               BlockDriver *drv, Error **errp);
197 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
198                                     BlockDriverState *bs, int flags);
199 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
200 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
201 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
202                         BlockReopenQueue *queue, Error **errp);
203 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
204 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
205 void bdrv_close(BlockDriverState *bs);
206 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
207 int bdrv_attach_dev(BlockDriverState *bs, void *dev);
208 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
209 void bdrv_detach_dev(BlockDriverState *bs, void *dev);
210 void *bdrv_get_attached_dev(BlockDriverState *bs);
211 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
212                       void *opaque);
213 void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
214 bool bdrv_dev_has_removable_media(BlockDriverState *bs);
215 bool bdrv_dev_is_tray_open(BlockDriverState *bs);
216 bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
217 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
218               uint8_t *buf, int nb_sectors);
219 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
220                           uint8_t *buf, int nb_sectors);
221 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
222                const uint8_t *buf, int nb_sectors);
223 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
224                int nb_sectors, BdrvRequestFlags flags);
225 BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
226                                         int nb_sectors, BdrvRequestFlags flags,
227                                         BlockDriverCompletionFunc *cb, void *opaque);
228 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
229 int bdrv_pread(BlockDriverState *bs, int64_t offset,
230                void *buf, int count);
231 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
232                 const void *buf, int count);
233 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
234 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
235     const void *buf, int count);
236 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
237     int nb_sectors, QEMUIOVector *qiov);
238 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
239     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
240 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
241     int nb_sectors, QEMUIOVector *qiov);
242 /*
243  * Efficiently zero a region of the disk image.  Note that this is a regular
244  * I/O request like read or write and should have a reasonable size.  This
245  * function is not suitable for zeroing the entire image in a single request
246  * because it may allocate memory for the entire region.
247  */
248 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
249     int nb_sectors, BdrvRequestFlags flags);
250 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
251     const char *backing_file);
252 int bdrv_get_backing_file_depth(BlockDriverState *bs);
253 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
254 int64_t bdrv_getlength(BlockDriverState *bs);
255 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
256 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
257 int bdrv_refresh_limits(BlockDriverState *bs);
258 int bdrv_commit(BlockDriverState *bs);
259 int bdrv_commit_all(void);
260 int bdrv_change_backing_file(BlockDriverState *bs,
261     const char *backing_file, const char *backing_fmt);
262 void bdrv_register(BlockDriver *bdrv);
263 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
264                            BlockDriverState *base);
265 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
266                                     BlockDriverState *bs);
267 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
268 
269 
270 typedef struct BdrvCheckResult {
271     int corruptions;
272     int leaks;
273     int check_errors;
274     int corruptions_fixed;
275     int leaks_fixed;
276     int64_t image_end_offset;
277     BlockFragInfo bfi;
278 } BdrvCheckResult;
279 
280 typedef enum {
281     BDRV_FIX_LEAKS    = 1,
282     BDRV_FIX_ERRORS   = 2,
283 } BdrvCheckMode;
284 
285 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
286 
287 int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);
288 
289 /* external snapshots */
290 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
291                                       BlockDriverState *candidate);
292 bool bdrv_is_first_non_filter(BlockDriverState *candidate);
293 
294 /* async block I/O */
295 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
296                                      int sector_num);
297 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
298                                  QEMUIOVector *iov, int nb_sectors,
299                                  BlockDriverCompletionFunc *cb, void *opaque);
300 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
301                                   QEMUIOVector *iov, int nb_sectors,
302                                   BlockDriverCompletionFunc *cb, void *opaque);
303 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
304                                  BlockDriverCompletionFunc *cb, void *opaque);
305 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
306                                    int64_t sector_num, int nb_sectors,
307                                    BlockDriverCompletionFunc *cb, void *opaque);
308 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
309 
310 typedef struct BlockRequest {
311     /* Fields to be filled by multiwrite caller */
312     int64_t sector;
313     int nb_sectors;
314     int flags;
315     QEMUIOVector *qiov;
316     BlockDriverCompletionFunc *cb;
317     void *opaque;
318 
319     /* Filled by multiwrite implementation */
320     int error;
321 } BlockRequest;
322 
323 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
324     int num_reqs);
325 
326 /* sg packet commands */
327 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
328 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
329         unsigned long int req, void *buf,
330         BlockDriverCompletionFunc *cb, void *opaque);
331 
332 /* Invalidate any cached metadata used by image formats */
333 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
334 void bdrv_invalidate_cache_all(Error **errp);
335 
336 void bdrv_clear_incoming_migration_all(void);
337 
338 /* Ensure contents are flushed to disk.  */
339 int bdrv_flush(BlockDriverState *bs);
340 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
341 int bdrv_flush_all(void);
342 void bdrv_close_all(void);
343 void bdrv_drain_all(void);
344 
345 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
346 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
347 int bdrv_has_zero_init_1(BlockDriverState *bs);
348 int bdrv_has_zero_init(BlockDriverState *bs);
349 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
350 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
351 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
352                               int nb_sectors, int *pnum);
353 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
354                       int *pnum);
355 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
356                             int64_t sector_num, int nb_sectors, int *pnum);
357 
358 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
359                        BlockdevOnError on_write_error);
360 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
361 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
362 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
363                        bool is_read, int error);
364 int bdrv_is_read_only(BlockDriverState *bs);
365 int bdrv_is_sg(BlockDriverState *bs);
366 int bdrv_enable_write_cache(BlockDriverState *bs);
367 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
368 int bdrv_is_inserted(BlockDriverState *bs);
369 int bdrv_media_changed(BlockDriverState *bs);
370 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
371 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
372 const char *bdrv_get_format_name(BlockDriverState *bs);
373 BlockDriverState *bdrv_find(const char *name);
374 BlockDriverState *bdrv_find_node(const char *node_name);
375 BlockDeviceInfoList *bdrv_named_nodes_list(void);
376 BlockDriverState *bdrv_lookup_bs(const char *device,
377                                  const char *node_name,
378                                  Error **errp);
379 BlockDriverState *bdrv_next(BlockDriverState *bs);
380 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
381                   void *opaque);
382 int bdrv_is_encrypted(BlockDriverState *bs);
383 int bdrv_key_required(BlockDriverState *bs);
384 int bdrv_set_key(BlockDriverState *bs, const char *key);
385 int bdrv_query_missing_keys(void);
386 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
387                          void *opaque);
388 const char *bdrv_get_device_name(BlockDriverState *bs);
389 int bdrv_get_flags(BlockDriverState *bs);
390 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
391                           const uint8_t *buf, int nb_sectors);
392 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
393 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
394 void bdrv_round_to_clusters(BlockDriverState *bs,
395                             int64_t sector_num, int nb_sectors,
396                             int64_t *cluster_sector_num,
397                             int *cluster_nb_sectors);
398 
399 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
400 void bdrv_get_backing_filename(BlockDriverState *bs,
401                                char *filename, int filename_size);
402 void bdrv_get_full_backing_filename(BlockDriverState *bs,
403                                     char *dest, size_t sz);
404 int bdrv_is_snapshot(BlockDriverState *bs);
405 
406 int path_is_absolute(const char *path);
407 void path_combine(char *dest, int dest_size,
408                   const char *base_path,
409                   const char *filename);
410 
411 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
412 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
413                       int64_t pos, int size);
414 
415 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
416                       int64_t pos, int size);
417 
418 void bdrv_img_create(const char *filename, const char *fmt,
419                      const char *base_filename, const char *base_fmt,
420                      char *options, uint64_t img_size, int flags,
421                      Error **errp, bool quiet);
422 
423 /* Returns the alignment in bytes that is required so that no bounce buffer
424  * is required throughout the stack */
425 size_t bdrv_opt_mem_align(BlockDriverState *bs);
426 void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
427 void *qemu_blockalign(BlockDriverState *bs, size_t size);
428 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
429 
430 struct HBitmapIter;
431 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
432 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
433                                           Error **errp);
434 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
435 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
436 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
437 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
438 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
439 void bdrv_dirty_iter_init(BlockDriverState *bs,
440                           BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
441 int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
442 
443 void bdrv_enable_copy_on_read(BlockDriverState *bs);
444 void bdrv_disable_copy_on_read(BlockDriverState *bs);
445 
446 void bdrv_ref(BlockDriverState *bs);
447 void bdrv_unref(BlockDriverState *bs);
448 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
449 int bdrv_in_use(BlockDriverState *bs);
450 
451 #ifdef CONFIG_LINUX_AIO
452 int raw_get_aio_fd(BlockDriverState *bs);
453 #else
454 static inline int raw_get_aio_fd(BlockDriverState *bs)
455 {
456     return -ENOTSUP;
457 }
458 #endif
459 
460 enum BlockAcctType {
461     BDRV_ACCT_READ,
462     BDRV_ACCT_WRITE,
463     BDRV_ACCT_FLUSH,
464     BDRV_MAX_IOTYPE,
465 };
466 
467 typedef struct BlockAcctCookie {
468     int64_t bytes;
469     int64_t start_time_ns;
470     enum BlockAcctType type;
471 } BlockAcctCookie;
472 
473 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
474         int64_t bytes, enum BlockAcctType type);
475 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
476 
477 typedef enum {
478     BLKDBG_L1_UPDATE,
479 
480     BLKDBG_L1_GROW_ALLOC_TABLE,
481     BLKDBG_L1_GROW_WRITE_TABLE,
482     BLKDBG_L1_GROW_ACTIVATE_TABLE,
483 
484     BLKDBG_L2_LOAD,
485     BLKDBG_L2_UPDATE,
486     BLKDBG_L2_UPDATE_COMPRESSED,
487     BLKDBG_L2_ALLOC_COW_READ,
488     BLKDBG_L2_ALLOC_WRITE,
489 
490     BLKDBG_READ_AIO,
491     BLKDBG_READ_BACKING_AIO,
492     BLKDBG_READ_COMPRESSED,
493 
494     BLKDBG_WRITE_AIO,
495     BLKDBG_WRITE_COMPRESSED,
496 
497     BLKDBG_VMSTATE_LOAD,
498     BLKDBG_VMSTATE_SAVE,
499 
500     BLKDBG_COW_READ,
501     BLKDBG_COW_WRITE,
502 
503     BLKDBG_REFTABLE_LOAD,
504     BLKDBG_REFTABLE_GROW,
505     BLKDBG_REFTABLE_UPDATE,
506 
507     BLKDBG_REFBLOCK_LOAD,
508     BLKDBG_REFBLOCK_UPDATE,
509     BLKDBG_REFBLOCK_UPDATE_PART,
510     BLKDBG_REFBLOCK_ALLOC,
511     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
512     BLKDBG_REFBLOCK_ALLOC_WRITE,
513     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
514     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
515     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
516 
517     BLKDBG_CLUSTER_ALLOC,
518     BLKDBG_CLUSTER_ALLOC_BYTES,
519     BLKDBG_CLUSTER_FREE,
520 
521     BLKDBG_FLUSH_TO_OS,
522     BLKDBG_FLUSH_TO_DISK,
523 
524     BLKDBG_PWRITEV_RMW_HEAD,
525     BLKDBG_PWRITEV_RMW_AFTER_HEAD,
526     BLKDBG_PWRITEV_RMW_TAIL,
527     BLKDBG_PWRITEV_RMW_AFTER_TAIL,
528     BLKDBG_PWRITEV,
529     BLKDBG_PWRITEV_ZERO,
530     BLKDBG_PWRITEV_DONE,
531 
532     BLKDBG_EVENT_MAX,
533 } BlkDebugEvent;
534 
535 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
536 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
537 
538 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
539                            const char *tag);
540 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
541 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
542 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
543 
544 #endif
545