| #ifndef BLOCK_H |
| #define BLOCK_H |
| |
| #include "block/aio.h" |
| #include "block/aio-wait.h" |
| #include "qemu/iov.h" |
| #include "qemu/coroutine.h" |
| #include "block/accounting.h" |
| #include "block/dirty-bitmap.h" |
| #include "block/blockjob.h" |
| #include "qemu/hbitmap.h" |
| |
| /* |
| * generated_co_wrapper |
| * |
| * Function specifier, which does nothing but mark functions to be |
| * generated by scripts/block-coroutine-wrapper.py |
| * |
| * Read more in docs/devel/block-coroutine-wrapper.rst |
| */ |
| #define generated_co_wrapper |
| |
| /* block.c */ |
| typedef struct BlockDriver BlockDriver; |
| typedef struct BdrvChild BdrvChild; |
| typedef struct BdrvChildClass BdrvChildClass; |
| |
| typedef struct BlockDriverInfo { |
| /* in bytes, 0 if irrelevant */ |
| int cluster_size; |
| /* offset at which the VM state can be saved (0 if not possible) */ |
| int64_t vm_state_offset; |
| bool is_dirty; |
| /* |
| * True if this block driver only supports compressed writes |
| */ |
| bool needs_compressed_writes; |
| } BlockDriverInfo; |
| |
| typedef struct BlockFragInfo { |
| uint64_t allocated_clusters; |
| uint64_t total_clusters; |
| uint64_t fragmented_clusters; |
| uint64_t compressed_clusters; |
| } BlockFragInfo; |
| |
| typedef enum { |
| BDRV_REQ_COPY_ON_READ = 0x1, |
| BDRV_REQ_ZERO_WRITE = 0x2, |
| |
| /* |
| * The BDRV_REQ_MAY_UNMAP flag is used in write_zeroes requests to indicate |
| * that the block driver should unmap (discard) blocks if it is guaranteed |
| * that the result will read back as zeroes. The flag is only passed to the |
| * driver if the block device is opened with BDRV_O_UNMAP. |
| */ |
| BDRV_REQ_MAY_UNMAP = 0x4, |
| |
| BDRV_REQ_FUA = 0x10, |
| BDRV_REQ_WRITE_COMPRESSED = 0x20, |
| |
| /* Signifies that this write request will not change the visible disk |
| * content. */ |
| BDRV_REQ_WRITE_UNCHANGED = 0x40, |
| |
| /* Forces request serialisation. Use only with write requests. */ |
| BDRV_REQ_SERIALISING = 0x80, |
| |
| /* Execute the request only if the operation can be offloaded or otherwise |
| * be executed efficiently, but return an error instead of using a slow |
| * fallback. */ |
| BDRV_REQ_NO_FALLBACK = 0x100, |
| |
| /* |
| * BDRV_REQ_PREFETCH makes sense only in the context of copy-on-read |
| * (i.e., together with the BDRV_REQ_COPY_ON_READ flag or when a COR |
| * filter is involved), in which case it signals that the COR operation |
| * need not read the data into memory (qiov) but only ensure they are |
| * copied to the top layer (i.e., that COR operation is done). |
| */ |
| BDRV_REQ_PREFETCH = 0x200, |
| |
| /* |
| * If we need to wait for other requests, just fail immediately. Used |
| * only together with BDRV_REQ_SERIALISING. |
| */ |
| BDRV_REQ_NO_WAIT = 0x400, |
| |
| /* Mask of valid flags */ |
| BDRV_REQ_MASK = 0x7ff, |
| } BdrvRequestFlags; |
| |
| typedef struct BlockSizes { |
| uint32_t phys; |
| uint32_t log; |
| } BlockSizes; |
| |
| typedef struct HDGeometry { |
| uint32_t heads; |
| uint32_t sectors; |
| uint32_t cylinders; |
| } HDGeometry; |
| |
| #define BDRV_O_RDWR 0x0002 |
| #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */ |
| #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ |
| #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ |
| #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ |
| #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ |
| #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ |
| #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ |
| #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ |
| #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ |
| #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ |
| #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ |
| #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ |
| #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: |
| select an appropriate protocol driver, |
| ignoring the format layer */ |
| #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ |
| #define BDRV_O_AUTO_RDONLY 0x20000 /* degrade to read-only if opening read-write fails */ |
| #define BDRV_O_IO_URING 0x40000 /* use io_uring instead of the thread pool */ |
| |
| #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) |
| |
| |
| /* Option names of options parsed by the block layer */ |
| |
| #define BDRV_OPT_CACHE_WB "cache.writeback" |
| #define BDRV_OPT_CACHE_DIRECT "cache.direct" |
| #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" |
| #define BDRV_OPT_READ_ONLY "read-only" |
| #define BDRV_OPT_AUTO_READ_ONLY "auto-read-only" |
| #define BDRV_OPT_DISCARD "discard" |
| #define BDRV_OPT_FORCE_SHARE "force-share" |
| |
| |
| #define BDRV_SECTOR_BITS 9 |
| #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) |
| |
| #define BDRV_REQUEST_MAX_SECTORS MIN_CONST(SIZE_MAX >> BDRV_SECTOR_BITS, \ |
| INT_MAX >> BDRV_SECTOR_BITS) |
| #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) |
| |
| /* |
| * We want allow aligning requests and disk length up to any 32bit alignment |
| * and don't afraid of overflow. |
| * To achieve it, and in the same time use some pretty number as maximum disk |
| * size, let's define maximum "length" (a limit for any offset/bytes request and |
| * for disk size) to be the greatest power of 2 less than INT64_MAX. |
| */ |
| #define BDRV_MAX_ALIGNMENT (1L << 30) |
| #define BDRV_MAX_LENGTH (QEMU_ALIGN_DOWN(INT64_MAX, BDRV_MAX_ALIGNMENT)) |
| |
| /* |
| * Allocation status flags for bdrv_block_status() and friends. |
| * |
| * Public flags: |
| * BDRV_BLOCK_DATA: allocation for data at offset is tied to this layer |
| * BDRV_BLOCK_ZERO: offset reads as zero |
| * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data |
| * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this |
| * layer rather than any backing, set by block layer |
| * BDRV_BLOCK_EOF: the returned pnum covers through end of file for this |
| * layer, set by block layer |
| * |
| * Internal flags: |
| * BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request |
| * that the block layer recompute the answer from the returned |
| * BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID. |
| * BDRV_BLOCK_RECURSE: request that the block layer will recursively search for |
| * zeroes in file child of current block node inside |
| * returned region. Only valid together with both |
| * BDRV_BLOCK_DATA and BDRV_BLOCK_OFFSET_VALID. Should not |
| * appear with BDRV_BLOCK_ZERO. |
| * |
| * If BDRV_BLOCK_OFFSET_VALID is set, the map parameter represents the |
| * host offset within the returned BDS that is allocated for the |
| * corresponding raw guest data. However, whether that offset |
| * actually contains data also depends on BDRV_BLOCK_DATA, as follows: |
| * |
| * DATA ZERO OFFSET_VALID |
| * t t t sectors read as zero, returned file is zero at offset |
| * t f t sectors read as valid from file at offset |
| * f t t sectors preallocated, read as zero, returned file not |
| * necessarily zero at offset |
| * f f t sectors preallocated but read from backing_hd, |
| * returned file contains garbage at offset |
| * t t f sectors preallocated, read as zero, unknown offset |
| * t f f sectors read from unknown file or offset |
| * f t f not allocated or unknown offset, read as zero |
| * f f f not allocated or unknown offset, read from backing_hd |
| */ |
| #define BDRV_BLOCK_DATA 0x01 |
| #define BDRV_BLOCK_ZERO 0x02 |
| #define BDRV_BLOCK_OFFSET_VALID 0x04 |
| #define BDRV_BLOCK_RAW 0x08 |
| #define BDRV_BLOCK_ALLOCATED 0x10 |
| #define BDRV_BLOCK_EOF 0x20 |
| #define BDRV_BLOCK_RECURSE 0x40 |
| |
| typedef QTAILQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; |
| |
| typedef struct BDRVReopenState { |
| BlockDriverState *bs; |
| int flags; |
| BlockdevDetectZeroesOptions detect_zeroes; |
| bool backing_missing; |
| bool replace_backing_bs; /* new_backing_bs is ignored if this is false */ |
| BlockDriverState *new_backing_bs; /* If NULL then detach the current bs */ |
| uint64_t perm, shared_perm; |
| QDict *options; |
| QDict *explicit_options; |
| void *opaque; |
| } BDRVReopenState; |
| |
| /* |
| * Block operation types |
| */ |
| typedef enum BlockOpType { |
| BLOCK_OP_TYPE_BACKUP_SOURCE, |
| BLOCK_OP_TYPE_BACKUP_TARGET, |
| BLOCK_OP_TYPE_CHANGE, |
| BLOCK_OP_TYPE_COMMIT_SOURCE, |
| BLOCK_OP_TYPE_COMMIT_TARGET, |
| BLOCK_OP_TYPE_DATAPLANE, |
| BLOCK_OP_TYPE_DRIVE_DEL, |
| BLOCK_OP_TYPE_EJECT, |
| BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, |
| BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, |
| BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, |
| BLOCK_OP_TYPE_MIRROR_SOURCE, |
| BLOCK_OP_TYPE_MIRROR_TARGET, |
| BLOCK_OP_TYPE_RESIZE, |
| BLOCK_OP_TYPE_STREAM, |
| BLOCK_OP_TYPE_REPLACE, |
| BLOCK_OP_TYPE_MAX, |
| } BlockOpType; |
| |
| /* Block node permission constants */ |
| enum { |
| /** |
| * A user that has the "permission" of consistent reads is guaranteed that |
| * their view of the contents of the block device is complete and |
| * self-consistent, representing the contents of a disk at a specific |
| * point. |
| * |
| * For most block devices (including their backing files) this is true, but |
| * the property cannot be maintained in a few situations like for |
| * intermediate nodes of a commit block job. |
| */ |
| BLK_PERM_CONSISTENT_READ = 0x01, |
| |
| /** This permission is required to change the visible disk contents. */ |
| BLK_PERM_WRITE = 0x02, |
| |
| /** |
| * This permission (which is weaker than BLK_PERM_WRITE) is both enough and |
| * required for writes to the block node when the caller promises that |
| * the visible disk content doesn't change. |
| * |
| * As the BLK_PERM_WRITE permission is strictly stronger, either is |
| * sufficient to perform an unchanging write. |
| */ |
| BLK_PERM_WRITE_UNCHANGED = 0x04, |
| |
| /** This permission is required to change the size of a block node. */ |
| BLK_PERM_RESIZE = 0x08, |
| |
| /** |
| * This permission is required to change the node that this BdrvChild |
| * points to. |
| */ |
| BLK_PERM_GRAPH_MOD = 0x10, |
| |
| BLK_PERM_ALL = 0x1f, |
| |
| DEFAULT_PERM_PASSTHROUGH = BLK_PERM_CONSISTENT_READ |
| | BLK_PERM_WRITE |
| | BLK_PERM_WRITE_UNCHANGED |
| | BLK_PERM_RESIZE, |
| |
| DEFAULT_PERM_UNCHANGED = BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH, |
| }; |
| |
| /* |
| * Flags that parent nodes assign to child nodes to specify what kind of |
| * role(s) they take. |
| * |
| * At least one of DATA, METADATA, FILTERED, or COW must be set for |
| * every child. |
| */ |
| enum BdrvChildRoleBits { |
| /* |
| * This child stores data. |
| * Any node may have an arbitrary number of such children. |
| */ |
| BDRV_CHILD_DATA = (1 << 0), |
| |
| /* |
| * This child stores metadata. |
| * Any node may have an arbitrary number of metadata-storing |
| * children. |
| */ |
| BDRV_CHILD_METADATA = (1 << 1), |
| |
| /* |
| * A child that always presents exactly the same visible data as |
| * the parent, e.g. by virtue of the parent forwarding all reads |
| * and writes. |
| * This flag is mutually exclusive with DATA, METADATA, and COW. |
| * Any node may have at most one filtered child at a time. |
| */ |
| BDRV_CHILD_FILTERED = (1 << 2), |
| |
| /* |
| * Child from which to read all data that isn't allocated in the |
| * parent (i.e., the backing child); such data is copied to the |
| * parent through COW (and optionally COR). |
| * This field is mutually exclusive with DATA, METADATA, and |
| * FILTERED. |
| * Any node may have at most one such backing child at a time. |
| */ |
| BDRV_CHILD_COW = (1 << 3), |
| |
| /* |
| * The primary child. For most drivers, this is the child whose |
| * filename applies best to the parent node. |
| * Any node may have at most one primary child at a time. |
| */ |
| BDRV_CHILD_PRIMARY = (1 << 4), |
| |
| /* Useful combination of flags */ |
| BDRV_CHILD_IMAGE = BDRV_CHILD_DATA |
| | BDRV_CHILD_METADATA |
| | BDRV_CHILD_PRIMARY, |
| }; |
| |
| /* Mask of BdrvChildRoleBits values */ |
| typedef unsigned int BdrvChildRole; |
| |
| char *bdrv_perm_names(uint64_t perm); |
| uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm); |
| |
| /* disk I/O throttling */ |
| void bdrv_init(void); |
| void bdrv_init_with_whitelist(void); |
| bool bdrv_uses_whitelist(void); |
| int bdrv_is_whitelisted(BlockDriver *drv, bool read_only); |
| BlockDriver *bdrv_find_protocol(const char *filename, |
| bool allow_protocol_prefix, |
| Error **errp); |
| BlockDriver *bdrv_find_format(const char *format_name); |
| int bdrv_create(BlockDriver *drv, const char* filename, |
| QemuOpts *opts, Error **errp); |
| int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); |
| |
| BlockDriverState *bdrv_new(void); |
| int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
| Error **errp); |
| int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
| Error **errp); |
| BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options, |
| int flags, Error **errp); |
| |
| int bdrv_parse_aio(const char *mode, int *flags); |
| int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); |
| int bdrv_parse_discard_flags(const char *mode, int *flags); |
| BdrvChild *bdrv_open_child(const char *filename, |
| QDict *options, const char *bdref_key, |
| BlockDriverState* parent, |
| const BdrvChildClass *child_class, |
| BdrvChildRole child_role, |
| bool allow_none, Error **errp); |
| BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp); |
| int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
| Error **errp); |
| int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
| const char *bdref_key, Error **errp); |
| BlockDriverState *bdrv_open(const char *filename, const char *reference, |
| QDict *options, int flags, Error **errp); |
| BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
| int flags, Error **errp); |
| BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| BlockDriverState *bs, QDict *options, |
| bool keep_old_opts); |
| int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); |
| int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
| Error **errp); |
| int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
| BlockReopenQueue *queue, Error **errp); |
| void bdrv_reopen_commit(BDRVReopenState *reopen_state); |
| void bdrv_reopen_abort(BDRVReopenState *reopen_state); |
| int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, |
| int64_t bytes, BdrvRequestFlags flags); |
| int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); |
| int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int64_t bytes); |
| int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, |
| int64_t bytes); |
| int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, |
| const void *buf, int64_t bytes); |
| /* |
| * Efficiently zero a region of the disk image. Note that this is a regular |
| * I/O request like read or write and should have a reasonable size. This |
| * function is not suitable for zeroing the entire image in a single request |
| * because it may allocate memory for the entire region. |
| */ |
| int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, |
| int64_t bytes, BdrvRequestFlags flags); |
| BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| const char *backing_file); |
| void bdrv_refresh_filename(BlockDriverState *bs); |
| |
| int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact, |
| PreallocMode prealloc, BdrvRequestFlags flags, |
| Error **errp); |
| int generated_co_wrapper |
| bdrv_truncate(BdrvChild *child, int64_t offset, bool exact, |
| PreallocMode prealloc, BdrvRequestFlags flags, Error **errp); |
| |
| int64_t bdrv_nb_sectors(BlockDriverState *bs); |
| int64_t bdrv_getlength(BlockDriverState *bs); |
| int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); |
| BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
| BlockDriverState *in_bs, Error **errp); |
| void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); |
| void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); |
| int bdrv_commit(BlockDriverState *bs); |
| int bdrv_make_empty(BdrvChild *c, Error **errp); |
| int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file, |
| const char *backing_fmt, bool warn); |
| void bdrv_register(BlockDriver *bdrv); |
| int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
| const char *backing_file_str); |
| BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| BlockDriverState *bs); |
| BlockDriverState *bdrv_find_base(BlockDriverState *bs); |
| bool bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, |
| Error **errp); |
| int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, |
| Error **errp); |
| void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base); |
| int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp); |
| void coroutine_fn bdrv_co_delete_file_noerr(BlockDriverState *bs); |
| |
| |
| typedef struct BdrvCheckResult { |
| int corruptions; |
| int leaks; |
| int check_errors; |
| int corruptions_fixed; |
| int leaks_fixed; |
| int64_t image_end_offset; |
| BlockFragInfo bfi; |
| } BdrvCheckResult; |
| |
| typedef enum { |
| BDRV_FIX_LEAKS = 1, |
| BDRV_FIX_ERRORS = 2, |
| } BdrvCheckMode; |
| |
| int generated_co_wrapper bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, |
| BdrvCheckMode fix); |
| |
| /* The units of offset and total_work_size may be chosen arbitrarily by the |
| * block driver; total_work_size may change during the course of the amendment |
| * operation */ |
| typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, |
| int64_t total_work_size, void *opaque); |
| int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, |
| BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
| bool force, |
| Error **errp); |
| |
| /* check if a named node can be replaced when doing drive-mirror */ |
| BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| const char *node_name, Error **errp); |
| |
| /* async block I/O */ |
| void bdrv_aio_cancel(BlockAIOCB *acb); |
| void bdrv_aio_cancel_async(BlockAIOCB *acb); |
| |
| /* sg packet commands */ |
| int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); |
| |
| /* Invalidate any cached metadata used by image formats */ |
| int generated_co_wrapper bdrv_invalidate_cache(BlockDriverState *bs, |
| Error **errp); |
| void bdrv_invalidate_cache_all(Error **errp); |
| int bdrv_inactivate_all(void); |
| |
| /* Ensure contents are flushed to disk. */ |
| int generated_co_wrapper bdrv_flush(BlockDriverState *bs); |
| int coroutine_fn bdrv_co_flush(BlockDriverState *bs); |
| int bdrv_flush_all(void); |
| void bdrv_close_all(void); |
| void bdrv_drain(BlockDriverState *bs); |
| void coroutine_fn bdrv_co_drain(BlockDriverState *bs); |
| void bdrv_drain_all_begin(void); |
| void bdrv_drain_all_end(void); |
| void bdrv_drain_all(void); |
| |
| #define BDRV_POLL_WHILE(bs, cond) ({ \ |
| BlockDriverState *bs_ = (bs); \ |
| AIO_WAIT_WHILE(bdrv_get_aio_context(bs_), \ |
| cond); }) |
| |
| int generated_co_wrapper bdrv_pdiscard(BdrvChild *child, int64_t offset, |
| int64_t bytes); |
| int bdrv_co_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes); |
| int bdrv_has_zero_init_1(BlockDriverState *bs); |
| int bdrv_has_zero_init(BlockDriverState *bs); |
| bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); |
| int bdrv_block_status(BlockDriverState *bs, int64_t offset, |
| int64_t bytes, int64_t *pnum, int64_t *map, |
| BlockDriverState **file); |
| int bdrv_block_status_above(BlockDriverState *bs, BlockDriverState *base, |
| int64_t offset, int64_t bytes, int64_t *pnum, |
| int64_t *map, BlockDriverState **file); |
| int bdrv_is_allocated(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| int64_t *pnum); |
| int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, |
| bool include_base, int64_t offset, int64_t bytes, |
| int64_t *pnum); |
| int coroutine_fn bdrv_co_is_zero_fast(BlockDriverState *bs, int64_t offset, |
| int64_t bytes); |
| |
| bool bdrv_is_read_only(BlockDriverState *bs); |
| int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
| bool ignore_allow_rdw, Error **errp); |
| int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, |
| Error **errp); |
| bool bdrv_is_writable(BlockDriverState *bs); |
| bool bdrv_is_sg(BlockDriverState *bs); |
| bool bdrv_is_inserted(BlockDriverState *bs); |
| void bdrv_lock_medium(BlockDriverState *bs, bool locked); |
| void bdrv_eject(BlockDriverState *bs, bool eject_flag); |
| const char *bdrv_get_format_name(BlockDriverState *bs); |
| BlockDriverState *bdrv_find_node(const char *node_name); |
| BlockDeviceInfoList *bdrv_named_nodes_list(bool flat, Error **errp); |
| XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp); |
| BlockDriverState *bdrv_lookup_bs(const char *device, |
| const char *node_name, |
| Error **errp); |
| bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); |
| BlockDriverState *bdrv_next_node(BlockDriverState *bs); |
| BlockDriverState *bdrv_next_all_states(BlockDriverState *bs); |
| |
| typedef struct BdrvNextIterator { |
| enum { |
| BDRV_NEXT_BACKEND_ROOTS, |
| BDRV_NEXT_MONITOR_OWNED, |
| } phase; |
| BlockBackend *blk; |
| BlockDriverState *bs; |
| } BdrvNextIterator; |
| |
| BlockDriverState *bdrv_first(BdrvNextIterator *it); |
| BlockDriverState *bdrv_next(BdrvNextIterator *it); |
| void bdrv_next_cleanup(BdrvNextIterator *it); |
| |
| BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); |
| bool bdrv_supports_compressed_writes(BlockDriverState *bs); |
| void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| void *opaque, bool read_only); |
| const char *bdrv_get_node_name(const BlockDriverState *bs); |
| const char *bdrv_get_device_name(const BlockDriverState *bs); |
| const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); |
| int bdrv_get_flags(BlockDriverState *bs); |
| int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); |
| ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
| Error **errp); |
| BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs); |
| void bdrv_round_to_clusters(BlockDriverState *bs, |
| int64_t offset, int64_t bytes, |
| int64_t *cluster_offset, |
| int64_t *cluster_bytes); |
| |
| void bdrv_get_backing_filename(BlockDriverState *bs, |
| char *filename, int filename_size); |
| char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp); |
| char *bdrv_get_full_backing_filename_from_filename(const char *backed, |
| const char *backing, |
| Error **errp); |
| char *bdrv_dirname(BlockDriverState *bs, Error **errp); |
| |
| int path_has_protocol(const char *path); |
| int path_is_absolute(const char *path); |
| char *path_combine(const char *base_path, const char *filename); |
| |
| int generated_co_wrapper |
| bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); |
| int generated_co_wrapper |
| bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); |
| int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
| int64_t pos, int size); |
| |
| int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
| int64_t pos, int size); |
| |
| void bdrv_img_create(const char *filename, const char *fmt, |
| const char *base_filename, const char *base_fmt, |
| char *options, uint64_t img_size, int flags, |
| bool quiet, Error **errp); |
| |
| /* Returns the alignment in bytes that is required so that no bounce buffer |
| * is required throughout the stack */ |
| size_t bdrv_min_mem_align(BlockDriverState *bs); |
| /* Returns optimal alignment in bytes for bounce buffer */ |
| size_t bdrv_opt_mem_align(BlockDriverState *bs); |
| void *qemu_blockalign(BlockDriverState *bs, size_t size); |
| void *qemu_blockalign0(BlockDriverState *bs, size_t size); |
| void *qemu_try_blockalign(BlockDriverState *bs, size_t size); |
| void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); |
| bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); |
| |
| void bdrv_enable_copy_on_read(BlockDriverState *bs); |
| void bdrv_disable_copy_on_read(BlockDriverState *bs); |
| |
| void bdrv_ref(BlockDriverState *bs); |
| void bdrv_unref(BlockDriverState *bs); |
| void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); |
| BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| BlockDriverState *child_bs, |
| const char *child_name, |
| const BdrvChildClass *child_class, |
| BdrvChildRole child_role, |
| Error **errp); |
| |
| bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); |
| void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); |
| void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); |
| void bdrv_op_block_all(BlockDriverState *bs, Error *reason); |
| void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); |
| bool bdrv_op_blocker_is_empty(BlockDriverState *bs); |
| |
| #define BLKDBG_EVENT(child, evt) \ |
| do { \ |
| if (child) { \ |
| bdrv_debug_event(child->bs, evt); \ |
| } \ |
| } while (0) |
| |
| void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); |
| |
| int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| const char *tag); |
| int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); |
| int bdrv_debug_resume(BlockDriverState *bs, const char *tag); |
| bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); |
| |
| /** |
| * bdrv_get_aio_context: |
| * |
| * Returns: the currently bound #AioContext |
| */ |
| AioContext *bdrv_get_aio_context(BlockDriverState *bs); |
| |
| /** |
| * Move the current coroutine to the AioContext of @bs and return the old |
| * AioContext of the coroutine. Increase bs->in_flight so that draining @bs |
| * will wait for the operation to proceed until the corresponding |
| * bdrv_co_leave(). |
| * |
| * Consequently, you can't call drain inside a bdrv_co_enter/leave() section as |
| * this will deadlock. |
| */ |
| AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs); |
| |
| /** |
| * Ends a section started by bdrv_co_enter(). Move the current coroutine back |
| * to old_ctx and decrease bs->in_flight again. |
| */ |
| void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx); |
| |
| /** |
| * Locks the AioContext of @bs if it's not the current AioContext. This avoids |
| * double locking which could lead to deadlocks: This is a coroutine_fn, so we |
| * know we already own the lock of the current AioContext. |
| * |
| * May only be called in the main thread. |
| */ |
| void coroutine_fn bdrv_co_lock(BlockDriverState *bs); |
| |
| /** |
| * Unlocks the AioContext of @bs if it's not the current AioContext. |
| */ |
| void coroutine_fn bdrv_co_unlock(BlockDriverState *bs); |
| |
| /** |
| * Transfer control to @co in the aio context of @bs |
| */ |
| void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); |
| |
| void bdrv_set_aio_context_ignore(BlockDriverState *bs, |
| AioContext *new_context, GSList **ignore); |
| int bdrv_try_set_aio_context(BlockDriverState *bs, AioContext *ctx, |
| Error **errp); |
| int bdrv_child_try_set_aio_context(BlockDriverState *bs, AioContext *ctx, |
| BdrvChild *ignore_child, Error **errp); |
| bool bdrv_child_can_set_aio_context(BdrvChild *c, AioContext *ctx, |
| GSList **ignore, Error **errp); |
| bool bdrv_can_set_aio_context(BlockDriverState *bs, AioContext *ctx, |
| GSList **ignore, Error **errp); |
| int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); |
| int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); |
| |
| void bdrv_io_plug(BlockDriverState *bs); |
| void bdrv_io_unplug(BlockDriverState *bs); |
| |
| /** |
| * bdrv_parent_drained_begin_single: |
| * |
| * Begin a quiesced section for the parent of @c. If @poll is true, wait for |
| * any pending activity to cease. |
| */ |
| void bdrv_parent_drained_begin_single(BdrvChild *c, bool poll); |
| |
| /** |
| * bdrv_parent_drained_end_single: |
| * |
| * End a quiesced section for the parent of @c. |
| * |
| * This polls @bs's AioContext until all scheduled sub-drained_ends |
| * have settled, which may result in graph changes. |
| */ |
| void bdrv_parent_drained_end_single(BdrvChild *c); |
| |
| /** |
| * bdrv_drain_poll: |
| * |
| * Poll for pending requests in @bs, its parents (except for @ignore_parent), |
| * and if @recursive is true its children as well (used for subtree drain). |
| * |
| * If @ignore_bds_parents is true, parents that are BlockDriverStates must |
| * ignore the drain request because they will be drained separately (used for |
| * drain_all). |
| * |
| * This is part of bdrv_drained_begin. |
| */ |
| bool bdrv_drain_poll(BlockDriverState *bs, bool recursive, |
| BdrvChild *ignore_parent, bool ignore_bds_parents); |
| |
| /** |
| * bdrv_drained_begin: |
| * |
| * Begin a quiesced section for exclusive access to the BDS, by disabling |
| * external request sources including NBD server and device model. Note that |
| * this doesn't block timers or coroutines from submitting more requests, which |
| * means block_job_pause is still necessary. |
| * |
| * This function can be recursive. |
| */ |
| void bdrv_drained_begin(BlockDriverState *bs); |
| |
| /** |
| * bdrv_do_drained_begin_quiesce: |
| * |
| * Quiesces a BDS like bdrv_drained_begin(), but does not wait for already |
| * running requests to complete. |
| */ |
| void bdrv_do_drained_begin_quiesce(BlockDriverState *bs, |
| BdrvChild *parent, bool ignore_bds_parents); |
| |
| /** |
| * Like bdrv_drained_begin, but recursively begins a quiesced section for |
| * exclusive access to all child nodes as well. |
| */ |
| void bdrv_subtree_drained_begin(BlockDriverState *bs); |
| |
| /** |
| * bdrv_drained_end: |
| * |
| * End a quiescent section started by bdrv_drained_begin(). |
| * |
| * This polls @bs's AioContext until all scheduled sub-drained_ends |
| * have settled. On one hand, that may result in graph changes. On |
| * the other, this requires that the caller either runs in the main |
| * loop; or that all involved nodes (@bs and all of its parents) are |
| * in the caller's AioContext. |
| */ |
| void bdrv_drained_end(BlockDriverState *bs); |
| |
| /** |
| * bdrv_drained_end_no_poll: |
| * |
| * Same as bdrv_drained_end(), but do not poll for the subgraph to |
| * actually become unquiesced. Therefore, no graph changes will occur |
| * with this function. |
| * |
| * *drained_end_counter is incremented for every background operation |
| * that is scheduled, and will be decremented for every operation once |
| * it settles. The caller must poll until it reaches 0. The counter |
| * should be accessed using atomic operations only. |
| */ |
| void bdrv_drained_end_no_poll(BlockDriverState *bs, int *drained_end_counter); |
| |
| /** |
| * End a quiescent section started by bdrv_subtree_drained_begin(). |
| */ |
| void bdrv_subtree_drained_end(BlockDriverState *bs); |
| |
| void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, |
| Error **errp); |
| void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); |
| |
| bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, |
| uint32_t granularity, Error **errp); |
| /** |
| * |
| * bdrv_register_buf/bdrv_unregister_buf: |
| * |
| * Register/unregister a buffer for I/O. For example, VFIO drivers are |
| * interested to know the memory areas that would later be used for I/O, so |
| * that they can prepare IOMMU mapping etc., to get better performance. |
| */ |
| void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size); |
| void bdrv_unregister_buf(BlockDriverState *bs, void *host); |
| |
| /** |
| * |
| * bdrv_co_copy_range: |
| * |
| * Do offloaded copy between two children. If the operation is not implemented |
| * by the driver, or if the backend storage doesn't support it, a negative |
| * error code will be returned. |
| * |
| * Note: block layer doesn't emulate or fallback to a bounce buffer approach |
| * because usually the caller shouldn't attempt offloaded copy any more (e.g. |
| * calling copy_file_range(2)) after the first error, thus it should fall back |
| * to a read+write path in the caller level. |
| * |
| * @src: Source child to copy data from |
| * @src_offset: offset in @src image to read data |
| * @dst: Destination child to copy data to |
| * @dst_offset: offset in @dst image to write data |
| * @bytes: number of bytes to copy |
| * @flags: request flags. Supported flags: |
| * BDRV_REQ_ZERO_WRITE - treat the @src range as zero data and do zero |
| * write on @dst as if bdrv_co_pwrite_zeroes is |
| * called. Used to simplify caller code, or |
| * during BlockDriver.bdrv_co_copy_range_from() |
| * recursion. |
| * BDRV_REQ_NO_SERIALISING - do not serialize with other overlapping |
| * requests currently in flight. |
| * |
| * Returns: 0 if succeeded; negative error code if failed. |
| **/ |
| int coroutine_fn bdrv_co_copy_range(BdrvChild *src, int64_t src_offset, |
| BdrvChild *dst, int64_t dst_offset, |
| int64_t bytes, BdrvRequestFlags read_flags, |
| BdrvRequestFlags write_flags); |
| |
| void bdrv_cancel_in_flight(BlockDriverState *bs); |
| |
| #endif |
