#ifndef BLOCK_H #define BLOCK_H #include "block/aio.h" #include "qemu-common.h" #include "qemu/option.h" #include "block/coroutine.h" #include "qapi/qmp/qobject.h" #include "qapi-types.h" /* block.c */ typedef struct BlockDriver BlockDriver; typedef struct BlockJob BlockJob; 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 unallocated blocks read back as zeroes. This is equivalent * to the the LBPRZ flag in the SCSI logical block provisioning page. */ bool unallocated_blocks_are_zero; /* * True if the driver can optimize writing zeroes by unmapping * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux * with the difference that in qemu a discard is allowed to silently * fail. Therefore we have to use bdrv_write_zeroes with the * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. * After this call the driver has to guarantee that the contents read * back as zero. It is additionally required that the block device is * opened with BDRV_O_UNMAP flag for this to work. */ bool can_write_zeroes_with_unmap; } BlockDriverInfo; typedef struct BlockFragInfo { uint64_t allocated_clusters; uint64_t total_clusters; uint64_t fragmented_clusters; uint64_t compressed_clusters; } BlockFragInfo; /* Callbacks for block device models */ typedef struct BlockDevOps { /* * Runs when virtual media changed (monitor commands eject, change) * Argument load is true on load and false on eject. * Beware: doesn't run when a host device's physical media * changes. Sure would be useful if it did. * Device models with removable media must implement this callback. */ void (*change_media_cb)(void *opaque, bool load); /* * Runs when an eject request is issued from the monitor, the tray * is closed, and the medium is locked. * Device models that do not implement is_medium_locked will not need * this callback. Device models that can lock the medium or tray might * want to implement the callback and unlock the tray when "force" is * true, even if they do not support eject requests. */ void (*eject_request_cb)(void *opaque, bool force); /* * Is the virtual tray open? * Device models implement this only when the device has a tray. */ bool (*is_tray_open)(void *opaque); /* * Is the virtual medium locked into the device? * Device models implement this only when device has such a lock. */ bool (*is_medium_locked)(void *opaque); /* * Runs when the size changed (e.g. monitor command block_resize) */ void (*resize_cb)(void *opaque); } BlockDevOps; typedef enum { BDRV_REQ_COPY_ON_READ = 0x1, BDRV_REQ_ZERO_WRITE = 0x2, /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver * is allowed to optimize a write zeroes request by unmapping (discarding) * 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, } BdrvRequestFlags; #define BDRV_O_RDWR 0x0002 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ #define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */ #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_INCOMING 0x0800 /* consistency hint for incoming migration */ #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_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH) #define BDRV_SECTOR_BITS 9 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) /* BDRV_BLOCK_DATA: data is read from bs->file or another file * BDRV_BLOCK_ZERO: sectors read as zero * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data * BDRV_BLOCK_RAW: used internally to indicate that the request * was answered by the raw driver and that one * should look in bs->file directly. * * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in * bs->file where sector data can be read from as raw data. * * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. * * DATA ZERO OFFSET_VALID * t t t sectors read as zero, bs->file is zero at offset * t f t sectors read as valid from bs->file at offset * f t t sectors preallocated, read as zero, bs->file not * necessarily zero at offset * f f t sectors preallocated but read from backing_hd, * bs->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 1 #define BDRV_BLOCK_ZERO 2 #define BDRV_BLOCK_OFFSET_VALID 4 #define BDRV_BLOCK_RAW 8 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK typedef enum { BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP } BlockErrorAction; typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; typedef struct BDRVReopenState { BlockDriverState *bs; int flags; void *opaque; } BDRVReopenState; void bdrv_iostatus_enable(BlockDriverState *bs); void bdrv_iostatus_reset(BlockDriverState *bs); void bdrv_iostatus_disable(BlockDriverState *bs); bool bdrv_iostatus_is_enabled(const BlockDriverState *bs); void bdrv_iostatus_set_err(BlockDriverState *bs, int error); void bdrv_info_print(Monitor *mon, const QObject *data); void bdrv_info(Monitor *mon, QObject **ret_data); void bdrv_stats_print(Monitor *mon, const QObject *data); void bdrv_info_stats(Monitor *mon, QObject **ret_data); /* disk I/O throttling */ void bdrv_io_limits_enable(BlockDriverState *bs); void bdrv_io_limits_disable(BlockDriverState *bs); void bdrv_init(void); void bdrv_init_with_whitelist(void); BlockDriver *bdrv_find_protocol(const char *filename, bool allow_protocol_prefix); BlockDriver *bdrv_find_format(const char *format_name); BlockDriver *bdrv_find_whitelisted_format(const char *format_name, bool readonly); int bdrv_create(BlockDriver *drv, const char* filename, QEMUOptionParameter *options, Error **errp); int bdrv_create_file(const char* filename, QEMUOptionParameter *options, Error **errp); BlockDriverState *bdrv_new(const char *device_name); void bdrv_make_anon(BlockDriverState *bs); void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old); void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); int bdrv_parse_cache_flags(const char *mode, int *flags); int bdrv_parse_discard_flags(const char *mode, int *flags); int bdrv_open_image(BlockDriverState **pbs, const char *filename, QDict *options, const char *bdref_key, int flags, bool allow_none, Error **errp); int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp); int bdrv_open(BlockDriverState **pbs, const char *filename, const char *reference, QDict *options, int flags, BlockDriver *drv, Error **errp); BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, BlockDriverState *bs, int flags); int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, 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); void bdrv_close(BlockDriverState *bs); void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify); int bdrv_attach_dev(BlockDriverState *bs, void *dev); void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev); void bdrv_detach_dev(BlockDriverState *bs, void *dev); void *bdrv_get_attached_dev(BlockDriverState *bs); void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, void *opaque); void bdrv_dev_eject_request(BlockDriverState *bs, bool force); bool bdrv_dev_has_removable_media(BlockDriverState *bs); bool bdrv_dev_is_tray_open(BlockDriverState *bs); bool bdrv_dev_is_medium_locked(BlockDriverState *bs); int bdrv_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors); int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors); int bdrv_write(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors); int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, BlockDriverCompletionFunc *cb, void *opaque); int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int count); int bdrv_pwrite(BlockDriverState *bs, int64_t offset, const void *buf, int count); int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, const void *buf, int count); int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); /* * 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_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *backing_file); int bdrv_get_backing_file_depth(BlockDriverState *bs); int bdrv_truncate(BlockDriverState *bs, int64_t offset); int64_t bdrv_getlength(BlockDriverState *bs); int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); int bdrv_refresh_limits(BlockDriverState *bs); int bdrv_commit(BlockDriverState *bs); int bdrv_commit_all(void); int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file, const char *backing_fmt); void bdrv_register(BlockDriver *bdrv); int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, BlockDriverState *base); BlockDriverState *bdrv_find_overlay(BlockDriverState *active, BlockDriverState *bs); BlockDriverState *bdrv_find_base(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 bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options); /* external snapshots */ bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, BlockDriverState *candidate); bool bdrv_is_first_non_filter(BlockDriverState *candidate); /* async block I/O */ typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector, int sector_num); BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *iov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque); BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *iov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque); BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, BlockDriverCompletionFunc *cb, void *opaque); BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque); void bdrv_aio_cancel(BlockDriverAIOCB *acb); typedef struct BlockRequest { /* Fields to be filled by multiwrite caller */ int64_t sector; int nb_sectors; int flags; QEMUIOVector *qiov; BlockDriverCompletionFunc *cb; void *opaque; /* Filled by multiwrite implementation */ int error; } BlockRequest; int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs); /* sg packet commands */ int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, unsigned long int req, void *buf, BlockDriverCompletionFunc *cb, void *opaque); /* Invalidate any cached metadata used by image formats */ void bdrv_invalidate_cache(BlockDriverState *bs); void bdrv_invalidate_cache_all(void); void bdrv_clear_incoming_migration_all(void); /* Ensure contents are flushed to disk. */ int 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_all(void); int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); int bdrv_has_zero_init_1(BlockDriverState *bs); int bdrv_has_zero_init(BlockDriverState *bs); bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum); int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum); int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, int64_t sector_num, int nb_sectors, int *pnum); void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, BlockdevOnError on_write_error); BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read); BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error); void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, bool is_read, int error); int bdrv_is_read_only(BlockDriverState *bs); int bdrv_is_sg(BlockDriverState *bs); int bdrv_enable_write_cache(BlockDriverState *bs); void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce); int bdrv_is_inserted(BlockDriverState *bs); int bdrv_media_changed(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(const char *name); BlockDriverState *bdrv_find_node(const char *node_name); BlockDeviceInfoList *bdrv_named_nodes_list(void); BlockDriverState *bdrv_lookup_bs(const char *device, const char *node_name, Error **errp); BlockDriverState *bdrv_next(BlockDriverState *bs); void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque); int bdrv_is_encrypted(BlockDriverState *bs); int bdrv_key_required(BlockDriverState *bs); int bdrv_set_key(BlockDriverState *bs, const char *key); int bdrv_query_missing_keys(void); void bdrv_iterate_format(void (*it)(void *opaque, const char *name), void *opaque); const char *bdrv_get_device_name(BlockDriverState *bs); int bdrv_get_flags(BlockDriverState *bs); int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors); int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); void bdrv_round_to_clusters(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int64_t *cluster_sector_num, int *cluster_nb_sectors); const char *bdrv_get_encrypted_filename(BlockDriverState *bs); void bdrv_get_backing_filename(BlockDriverState *bs, char *filename, int filename_size); void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz); int bdrv_is_snapshot(BlockDriverState *bs); int path_is_absolute(const char *path); void path_combine(char *dest, int dest_size, const char *base_path, const char *filename); int 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, Error **errp, bool quiet); /* Returns the alignment in bytes that is required so that no bounce buffer * is required throughout the stack */ size_t bdrv_opt_mem_align(BlockDriverState *bs); void bdrv_set_guest_block_size(BlockDriverState *bs, int align); void *qemu_blockalign(BlockDriverState *bs, size_t size); bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); struct HBitmapIter; typedef struct BdrvDirtyBitmap BdrvDirtyBitmap; BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity); void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap); BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs); int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector); void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors); void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors); void bdrv_dirty_iter_init(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi); int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap); 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_set_in_use(BlockDriverState *bs, int in_use); int bdrv_in_use(BlockDriverState *bs); #ifdef CONFIG_LINUX_AIO int raw_get_aio_fd(BlockDriverState *bs); #else static inline int raw_get_aio_fd(BlockDriverState *bs) { return -ENOTSUP; } #endif enum BlockAcctType { BDRV_ACCT_READ, BDRV_ACCT_WRITE, BDRV_ACCT_FLUSH, BDRV_MAX_IOTYPE, }; typedef struct BlockAcctCookie { int64_t bytes; int64_t start_time_ns; enum BlockAcctType type; } BlockAcctCookie; void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, enum BlockAcctType type); void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie); typedef enum { BLKDBG_L1_UPDATE, BLKDBG_L1_GROW_ALLOC_TABLE, BLKDBG_L1_GROW_WRITE_TABLE, BLKDBG_L1_GROW_ACTIVATE_TABLE, BLKDBG_L2_LOAD, BLKDBG_L2_UPDATE, BLKDBG_L2_UPDATE_COMPRESSED, BLKDBG_L2_ALLOC_COW_READ, BLKDBG_L2_ALLOC_WRITE, BLKDBG_READ_AIO, BLKDBG_READ_BACKING_AIO, BLKDBG_READ_COMPRESSED, BLKDBG_WRITE_AIO, BLKDBG_WRITE_COMPRESSED, BLKDBG_VMSTATE_LOAD, BLKDBG_VMSTATE_SAVE, BLKDBG_COW_READ, BLKDBG_COW_WRITE, BLKDBG_REFTABLE_LOAD, BLKDBG_REFTABLE_GROW, BLKDBG_REFTABLE_UPDATE, BLKDBG_REFBLOCK_LOAD, BLKDBG_REFBLOCK_UPDATE, BLKDBG_REFBLOCK_UPDATE_PART, BLKDBG_REFBLOCK_ALLOC, BLKDBG_REFBLOCK_ALLOC_HOOKUP, BLKDBG_REFBLOCK_ALLOC_WRITE, BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS, BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE, BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE, BLKDBG_CLUSTER_ALLOC, BLKDBG_CLUSTER_ALLOC_BYTES, BLKDBG_CLUSTER_FREE, BLKDBG_FLUSH_TO_OS, BLKDBG_FLUSH_TO_DISK, BLKDBG_PWRITEV_RMW_HEAD, BLKDBG_PWRITEV_RMW_AFTER_HEAD, BLKDBG_PWRITEV_RMW_TAIL, BLKDBG_PWRITEV_RMW_AFTER_TAIL, BLKDBG_PWRITEV, BLKDBG_PWRITEV_ZERO, BLKDBG_PWRITEV_DONE, BLKDBG_EVENT_MAX, } BlkDebugEvent; #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt) 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); #endif