d7d512f609
The first user of close notifiers will be the embedded NBD server. It would be possible to use them to do some of the ad hoc processing (e.g. for block jobs and I/O limits) that is currently done by bdrv_close. Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
431 lines
17 KiB
C
431 lines
17 KiB
C
#ifndef BLOCK_H
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#define BLOCK_H
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#include "qemu-aio.h"
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#include "qemu-common.h"
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#include "qemu-option.h"
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#include "qemu-coroutine.h"
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#include "qobject.h"
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#include "qapi-types.h"
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/* block.c */
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typedef struct BlockDriver BlockDriver;
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typedef struct BlockJob BlockJob;
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typedef struct BlockDriverInfo {
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/* in bytes, 0 if irrelevant */
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int cluster_size;
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/* offset at which the VM state can be saved (0 if not possible) */
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int64_t vm_state_offset;
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bool is_dirty;
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} BlockDriverInfo;
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typedef struct BlockFragInfo {
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uint64_t allocated_clusters;
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uint64_t total_clusters;
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uint64_t fragmented_clusters;
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} BlockFragInfo;
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typedef struct QEMUSnapshotInfo {
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char id_str[128]; /* unique snapshot id */
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/* the following fields are informative. They are not needed for
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the consistency of the snapshot */
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char name[256]; /* user chosen name */
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uint64_t vm_state_size; /* VM state info size */
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uint32_t date_sec; /* UTC date of the snapshot */
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uint32_t date_nsec;
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uint64_t vm_clock_nsec; /* VM clock relative to boot */
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} QEMUSnapshotInfo;
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/* Callbacks for block device models */
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typedef struct BlockDevOps {
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/*
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* Runs when virtual media changed (monitor commands eject, change)
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* Argument load is true on load and false on eject.
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* Beware: doesn't run when a host device's physical media
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* changes. Sure would be useful if it did.
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* Device models with removable media must implement this callback.
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*/
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void (*change_media_cb)(void *opaque, bool load);
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/*
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* Runs when an eject request is issued from the monitor, the tray
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* is closed, and the medium is locked.
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* Device models that do not implement is_medium_locked will not need
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* this callback. Device models that can lock the medium or tray might
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* want to implement the callback and unlock the tray when "force" is
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* true, even if they do not support eject requests.
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*/
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void (*eject_request_cb)(void *opaque, bool force);
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/*
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* Is the virtual tray open?
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* Device models implement this only when the device has a tray.
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*/
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bool (*is_tray_open)(void *opaque);
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/*
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* Is the virtual medium locked into the device?
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* Device models implement this only when device has such a lock.
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*/
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bool (*is_medium_locked)(void *opaque);
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/*
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* Runs when the size changed (e.g. monitor command block_resize)
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*/
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void (*resize_cb)(void *opaque);
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} BlockDevOps;
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#define BDRV_O_RDWR 0x0002
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#define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
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#define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
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#define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
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#define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
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#define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
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#define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
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#define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
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#define BDRV_O_INCOMING 0x0800 /* consistency hint for incoming migration */
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#define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
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#define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
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#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
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#define BDRV_SECTOR_BITS 9
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#define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
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#define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
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typedef enum {
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BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
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} BlockErrorAction;
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typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
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typedef struct BDRVReopenState {
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BlockDriverState *bs;
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int flags;
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void *opaque;
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} BDRVReopenState;
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void bdrv_iostatus_enable(BlockDriverState *bs);
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void bdrv_iostatus_reset(BlockDriverState *bs);
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void bdrv_iostatus_disable(BlockDriverState *bs);
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bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
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void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
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void bdrv_info_print(Monitor *mon, const QObject *data);
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void bdrv_info(Monitor *mon, QObject **ret_data);
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void bdrv_stats_print(Monitor *mon, const QObject *data);
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void bdrv_info_stats(Monitor *mon, QObject **ret_data);
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/* disk I/O throttling */
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void bdrv_io_limits_enable(BlockDriverState *bs);
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void bdrv_io_limits_disable(BlockDriverState *bs);
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bool bdrv_io_limits_enabled(BlockDriverState *bs);
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void bdrv_init(void);
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void bdrv_init_with_whitelist(void);
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BlockDriver *bdrv_find_protocol(const char *filename);
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BlockDriver *bdrv_find_format(const char *format_name);
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
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int bdrv_create(BlockDriver *drv, const char* filename,
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QEMUOptionParameter *options);
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
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BlockDriverState *bdrv_new(const char *device_name);
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void bdrv_make_anon(BlockDriverState *bs);
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void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
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void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
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void bdrv_delete(BlockDriverState *bs);
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int bdrv_parse_cache_flags(const char *mode, int *flags);
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int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
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int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
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BlockDriver *drv);
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BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
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BlockDriverState *bs, int flags);
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int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
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int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
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int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
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BlockReopenQueue *queue, Error **errp);
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void bdrv_reopen_commit(BDRVReopenState *reopen_state);
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void bdrv_reopen_abort(BDRVReopenState *reopen_state);
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void bdrv_close(BlockDriverState *bs);
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void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
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int bdrv_attach_dev(BlockDriverState *bs, void *dev);
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void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
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void bdrv_detach_dev(BlockDriverState *bs, void *dev);
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void *bdrv_get_attached_dev(BlockDriverState *bs);
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void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
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void *opaque);
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void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
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bool bdrv_dev_has_removable_media(BlockDriverState *bs);
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bool bdrv_dev_is_tray_open(BlockDriverState *bs);
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bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
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int bdrv_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int bdrv_pread(BlockDriverState *bs, int64_t offset,
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void *buf, int count);
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int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
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const void *buf, int count);
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int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
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const void *buf, int count);
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int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov);
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int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
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int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov);
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/*
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* Efficiently zero a region of the disk image. Note that this is a regular
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* I/O request like read or write and should have a reasonable size. This
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* function is not suitable for zeroing the entire image in a single request
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* because it may allocate memory for the entire region.
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*/
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int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors);
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int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum);
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int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
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BlockDriverState *base,
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int64_t sector_num,
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int nb_sectors, int *pnum);
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BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
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const char *backing_file);
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int bdrv_get_backing_file_depth(BlockDriverState *bs);
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int bdrv_truncate(BlockDriverState *bs, int64_t offset);
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int64_t bdrv_getlength(BlockDriverState *bs);
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int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
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void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
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int bdrv_commit(BlockDriverState *bs);
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int bdrv_commit_all(void);
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int bdrv_change_backing_file(BlockDriverState *bs,
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const char *backing_file, const char *backing_fmt);
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void bdrv_register(BlockDriver *bdrv);
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int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
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BlockDriverState *base);
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BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
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BlockDriverState *bs);
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BlockDriverState *bdrv_find_base(BlockDriverState *bs);
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typedef struct BdrvCheckResult {
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int corruptions;
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int leaks;
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int check_errors;
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int corruptions_fixed;
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int leaks_fixed;
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BlockFragInfo bfi;
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} BdrvCheckResult;
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typedef enum {
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BDRV_FIX_LEAKS = 1,
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BDRV_FIX_ERRORS = 2,
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} BdrvCheckMode;
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int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
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/* async block I/O */
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typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
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int sector_num);
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BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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void bdrv_aio_cancel(BlockDriverAIOCB *acb);
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typedef struct BlockRequest {
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/* Fields to be filled by multiwrite caller */
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int64_t sector;
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int nb_sectors;
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QEMUIOVector *qiov;
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BlockDriverCompletionFunc *cb;
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void *opaque;
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/* Filled by multiwrite implementation */
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int error;
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} BlockRequest;
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int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
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int num_reqs);
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/* sg packet commands */
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int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
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BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
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unsigned long int req, void *buf,
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BlockDriverCompletionFunc *cb, void *opaque);
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/* Invalidate any cached metadata used by image formats */
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void bdrv_invalidate_cache(BlockDriverState *bs);
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void bdrv_invalidate_cache_all(void);
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void bdrv_clear_incoming_migration_all(void);
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/* Ensure contents are flushed to disk. */
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int bdrv_flush(BlockDriverState *bs);
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int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
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void bdrv_flush_all(void);
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void bdrv_close_all(void);
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void bdrv_drain_all(void);
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int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
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int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
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int bdrv_has_zero_init(BlockDriverState *bs);
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int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
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int *pnum);
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void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
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BlockdevOnError on_write_error);
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BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
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BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
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void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
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bool is_read, int error);
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int bdrv_is_read_only(BlockDriverState *bs);
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int bdrv_is_sg(BlockDriverState *bs);
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int bdrv_enable_write_cache(BlockDriverState *bs);
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void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
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int bdrv_is_inserted(BlockDriverState *bs);
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int bdrv_media_changed(BlockDriverState *bs);
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void bdrv_lock_medium(BlockDriverState *bs, bool locked);
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void bdrv_eject(BlockDriverState *bs, bool eject_flag);
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const char *bdrv_get_format_name(BlockDriverState *bs);
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BlockDriverState *bdrv_find(const char *name);
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BlockDriverState *bdrv_next(BlockDriverState *bs);
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void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
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void *opaque);
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int bdrv_is_encrypted(BlockDriverState *bs);
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int bdrv_key_required(BlockDriverState *bs);
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int bdrv_set_key(BlockDriverState *bs, const char *key);
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int bdrv_query_missing_keys(void);
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void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
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void *opaque);
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const char *bdrv_get_device_name(BlockDriverState *bs);
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int bdrv_get_flags(BlockDriverState *bs);
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int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
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const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
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void bdrv_get_backing_filename(BlockDriverState *bs,
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char *filename, int filename_size);
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void bdrv_get_full_backing_filename(BlockDriverState *bs,
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char *dest, size_t sz);
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int bdrv_can_snapshot(BlockDriverState *bs);
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int bdrv_is_snapshot(BlockDriverState *bs);
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BlockDriverState *bdrv_snapshots(void);
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int bdrv_snapshot_create(BlockDriverState *bs,
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QEMUSnapshotInfo *sn_info);
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int bdrv_snapshot_goto(BlockDriverState *bs,
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const char *snapshot_id);
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int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
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int bdrv_snapshot_list(BlockDriverState *bs,
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QEMUSnapshotInfo **psn_info);
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int bdrv_snapshot_load_tmp(BlockDriverState *bs,
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const char *snapshot_name);
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char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
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char *get_human_readable_size(char *buf, int buf_size, int64_t size);
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int path_is_absolute(const char *path);
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void path_combine(char *dest, int dest_size,
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const char *base_path,
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const char *filename);
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int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
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int64_t pos, int size);
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int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
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int64_t pos, int size);
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int bdrv_img_create(const char *filename, const char *fmt,
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const char *base_filename, const char *base_fmt,
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char *options, uint64_t img_size, int flags);
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void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
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void *qemu_blockalign(BlockDriverState *bs, size_t size);
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#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
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void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
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int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
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void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
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int nr_sectors);
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int64_t bdrv_get_dirty_count(BlockDriverState *bs);
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void bdrv_enable_copy_on_read(BlockDriverState *bs);
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void bdrv_disable_copy_on_read(BlockDriverState *bs);
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void bdrv_set_in_use(BlockDriverState *bs, int in_use);
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int bdrv_in_use(BlockDriverState *bs);
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enum BlockAcctType {
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BDRV_ACCT_READ,
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BDRV_ACCT_WRITE,
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BDRV_ACCT_FLUSH,
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BDRV_MAX_IOTYPE,
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};
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typedef struct BlockAcctCookie {
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int64_t bytes;
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int64_t start_time_ns;
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enum BlockAcctType type;
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} BlockAcctCookie;
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void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
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int64_t bytes, enum BlockAcctType type);
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void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
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typedef enum {
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BLKDBG_L1_UPDATE,
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BLKDBG_L1_GROW_ALLOC_TABLE,
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BLKDBG_L1_GROW_WRITE_TABLE,
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BLKDBG_L1_GROW_ACTIVATE_TABLE,
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BLKDBG_L2_LOAD,
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BLKDBG_L2_UPDATE,
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BLKDBG_L2_UPDATE_COMPRESSED,
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BLKDBG_L2_ALLOC_COW_READ,
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BLKDBG_L2_ALLOC_WRITE,
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BLKDBG_READ_AIO,
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BLKDBG_READ_BACKING_AIO,
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BLKDBG_READ_COMPRESSED,
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BLKDBG_WRITE_AIO,
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BLKDBG_WRITE_COMPRESSED,
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BLKDBG_VMSTATE_LOAD,
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BLKDBG_VMSTATE_SAVE,
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BLKDBG_COW_READ,
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BLKDBG_COW_WRITE,
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BLKDBG_REFTABLE_LOAD,
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BLKDBG_REFTABLE_GROW,
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|
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BLKDBG_REFBLOCK_LOAD,
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BLKDBG_REFBLOCK_UPDATE,
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BLKDBG_REFBLOCK_UPDATE_PART,
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BLKDBG_REFBLOCK_ALLOC,
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BLKDBG_REFBLOCK_ALLOC_HOOKUP,
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BLKDBG_REFBLOCK_ALLOC_WRITE,
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|
BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
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BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
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|
BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
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|
|
|
BLKDBG_CLUSTER_ALLOC,
|
|
BLKDBG_CLUSTER_ALLOC_BYTES,
|
|
BLKDBG_CLUSTER_FREE,
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|
|
|
BLKDBG_EVENT_MAX,
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|
} BlkDebugEvent;
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|
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|
#define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
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void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
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|
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#endif
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