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Diffstat (limited to 'include/block/block_int.h')
| -rw-r--r-- | include/block/block_int.h | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h new file mode 100644 index 0000000000..f83ffb8a08 --- /dev/null +++ b/include/block/block_int.h @@ -0,0 +1,366 @@ +/* + * QEMU System Emulator block driver + * + * Copyright (c) 2003 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#ifndef BLOCK_INT_H +#define BLOCK_INT_H + +#include "block/block.h" +#include "qemu/option.h" +#include "qemu/queue.h" +#include "block/coroutine.h" +#include "qemu/timer.h" +#include "qapi-types.h" +#include "qapi/qmp/qerror.h" +#include "monitor/monitor.h" + +#define BLOCK_FLAG_ENCRYPT 1 +#define BLOCK_FLAG_COMPAT6 4 +#define BLOCK_FLAG_LAZY_REFCOUNTS 8 + +#define BLOCK_IO_LIMIT_READ 0 +#define BLOCK_IO_LIMIT_WRITE 1 +#define BLOCK_IO_LIMIT_TOTAL 2 + +#define BLOCK_IO_SLICE_TIME 100000000 +#define NANOSECONDS_PER_SECOND 1000000000.0 + +#define BLOCK_OPT_SIZE "size" +#define BLOCK_OPT_ENCRYPT "encryption" +#define BLOCK_OPT_COMPAT6 "compat6" +#define BLOCK_OPT_BACKING_FILE "backing_file" +#define BLOCK_OPT_BACKING_FMT "backing_fmt" +#define BLOCK_OPT_CLUSTER_SIZE "cluster_size" +#define BLOCK_OPT_TABLE_SIZE "table_size" +#define BLOCK_OPT_PREALLOC "preallocation" +#define BLOCK_OPT_SUBFMT "subformat" +#define BLOCK_OPT_COMPAT_LEVEL "compat" +#define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts" + +typedef struct BdrvTrackedRequest BdrvTrackedRequest; + +typedef struct BlockIOLimit { + int64_t bps[3]; + int64_t iops[3]; +} BlockIOLimit; + +typedef struct BlockIOBaseValue { + uint64_t bytes[2]; + uint64_t ios[2]; +} BlockIOBaseValue; + +struct BlockDriver { + const char *format_name; + int instance_size; + int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); + int (*bdrv_probe_device)(const char *filename); + + /* For handling image reopen for split or non-split files */ + 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_open)(BlockDriverState *bs, int flags); + int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags); + int (*bdrv_read)(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); + void (*bdrv_close)(BlockDriverState *bs); + void (*bdrv_rebind)(BlockDriverState *bs); + int (*bdrv_create)(const char *filename, QEMUOptionParameter *options); + int (*bdrv_set_key)(BlockDriverState *bs, const char *key); + int (*bdrv_make_empty)(BlockDriverState *bs); + /* aio */ + BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs, + int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, + BlockDriverCompletionFunc *cb, void *opaque); + BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs, + int64_t sector_num, QEMUIOVector *qiov, 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); + + int coroutine_fn (*bdrv_co_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. Typically an image format + * would use a compact metadata representation to implement this. This + * function pointer may be NULL and .bdrv_co_writev() will be called + * instead. + */ + int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs, + int64_t sector_num, int nb_sectors); + int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs, + int64_t sector_num, int nb_sectors); + int coroutine_fn (*bdrv_co_is_allocated)(BlockDriverState *bs, + int64_t sector_num, int nb_sectors, int *pnum); + + /* + * Invalidate any cached meta-data. + */ + void (*bdrv_invalidate_cache)(BlockDriverState *bs); + + /* + * Flushes all data that was already written to the OS all the way down to + * the disk (for example raw-posix calls fsync()). + */ + int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs); + + /* + * Flushes all internal caches to the OS. The data may still sit in a + * writeback cache of the host OS, but it will survive a crash of the qemu + * process. + */ + int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs); + + const char *protocol_name; + int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); + int64_t (*bdrv_getlength)(BlockDriverState *bs); + int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); + int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num, + const uint8_t *buf, int nb_sectors); + + int (*bdrv_snapshot_create)(BlockDriverState *bs, + QEMUSnapshotInfo *sn_info); + int (*bdrv_snapshot_goto)(BlockDriverState *bs, + const char *snapshot_id); + int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id); + int (*bdrv_snapshot_list)(BlockDriverState *bs, + QEMUSnapshotInfo **psn_info); + int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, + const char *snapshot_name); + int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); + + 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); + + int (*bdrv_change_backing_file)(BlockDriverState *bs, + const char *backing_file, const char *backing_fmt); + + /* removable device specific */ + int (*bdrv_is_inserted)(BlockDriverState *bs); + int (*bdrv_media_changed)(BlockDriverState *bs); + void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); + void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); + + /* to control generic scsi devices */ + 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); + + /* List of options for creating images, terminated by name == NULL */ + QEMUOptionParameter *create_options; + + + /* + * Returns 0 for completed check, -errno for internal errors. + * The check results are stored in result. + */ + int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result, + BdrvCheckMode fix); + + void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event); + + /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ + int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, + const char *tag); + int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); + bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); + + /* + * Returns 1 if newly created images are guaranteed to contain only + * zeros, 0 otherwise. + */ + int (*bdrv_has_zero_init)(BlockDriverState *bs); + + QLIST_ENTRY(BlockDriver) list; +}; + +/* + * Note: the function bdrv_append() copies and swaps contents of + * BlockDriverStates, so if you add new fields to this struct, please + * inspect bdrv_append() to determine if the new fields need to be + * copied as well. + */ +struct BlockDriverState { + int64_t total_sectors; /* if we are reading a disk image, give its + size in sectors */ + int read_only; /* if true, the media is read only */ + int open_flags; /* flags used to open the file, re-used for re-open */ + int encrypted; /* if true, the media is encrypted */ + int valid_key; /* if true, a valid encryption key has been set */ + int sg; /* if true, the device is a /dev/sg* */ + int copy_on_read; /* if true, copy read backing sectors into image + note this is a reference count */ + + BlockDriver *drv; /* NULL means no media */ + void *opaque; + + void *dev; /* attached device model, if any */ + /* TODO change to DeviceState when all users are qdevified */ + const BlockDevOps *dev_ops; + void *dev_opaque; + + char filename[1024]; + char backing_file[1024]; /* if non zero, the image is a diff of + this file image */ + char backing_format[16]; /* if non-zero and backing_file exists */ + int is_temporary; + + BlockDriverState *backing_hd; + BlockDriverState *file; + + NotifierList close_notifiers; + + /* number of in-flight copy-on-read requests */ + unsigned int copy_on_read_in_flight; + + /* the time for latest disk I/O */ + int64_t slice_time; + int64_t slice_start; + int64_t slice_end; + BlockIOLimit io_limits; + BlockIOBaseValue io_base; + CoQueue throttled_reqs; + QEMUTimer *block_timer; + bool io_limits_enabled; + + /* I/O stats (display with "info blockstats"). */ + uint64_t nr_bytes[BDRV_MAX_IOTYPE]; + uint64_t nr_ops[BDRV_MAX_IOTYPE]; + uint64_t total_time_ns[BDRV_MAX_IOTYPE]; + uint64_t wr_highest_sector; + + /* Whether the disk can expand beyond total_sectors */ + int growable; + + /* the memory alignment required for the buffers handled by this driver */ + int buffer_alignment; + + /* do we need to tell the quest if we have a volatile write cache? */ + int enable_write_cache; + + /* NOTE: the following infos are only hints for real hardware + drivers. They are not used by the block driver */ + BlockdevOnError on_read_error, on_write_error; + bool iostatus_enabled; + BlockDeviceIoStatus iostatus; + char device_name[32]; + unsigned long *dirty_bitmap; + int64_t dirty_count; + int in_use; /* users other than guest access, eg. block migration */ + QTAILQ_ENTRY(BlockDriverState) list; + + QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; + + /* long-running background operation */ + BlockJob *job; + +}; + +int get_tmp_filename(char *filename, int size); + +void bdrv_set_io_limits(BlockDriverState *bs, + BlockIOLimit *io_limits); + +#ifdef _WIN32 +int is_windows_drive(const char *filename); +#endif +void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, + enum MonitorEvent ev, + BlockErrorAction action, bool is_read); + +/** + * stream_start: + * @bs: Block device to operate on. + * @base: Block device that will become the new base, or %NULL to + * flatten the whole backing file chain onto @bs. + * @base_id: The file name that will be written to @bs as the new + * backing file if the job completes. Ignored if @base is %NULL. + * @speed: The maximum speed, in bytes per second, or 0 for unlimited. + * @on_error: The action to take upon error. + * @cb: Completion function for the job. + * @opaque: Opaque pointer value passed to @cb. + * @errp: Error object. + * + * Start a streaming operation on @bs. Clusters that are unallocated + * in @bs, but allocated in any image between @base and @bs (both + * exclusive) will be written to @bs. At the end of a successful + * streaming job, the backing file of @bs will be changed to + * @base_id in the written image and to @base in the live BlockDriverState. + */ +void stream_start(BlockDriverState *bs, BlockDriverState *base, + const char *base_id, int64_t speed, BlockdevOnError on_error, + BlockDriverCompletionFunc *cb, + void *opaque, Error **errp); + +/** + * commit_start: + * @bs: Top Block device + * @base: Block device that will be written into, and become the new top + * @speed: The maximum speed, in bytes per second, or 0 for unlimited. + * @on_error: The action to take upon error. + * @cb: Completion function for the job. + * @opaque: Opaque pointer value passed to @cb. + * @errp: Error object. + * + */ +void commit_start(BlockDriverState *bs, BlockDriverState *base, + BlockDriverState *top, int64_t speed, + BlockdevOnError on_error, BlockDriverCompletionFunc *cb, + void *opaque, Error **errp); + +/* + * mirror_start: + * @bs: Block device to operate on. + * @target: Block device to write to. + * @speed: The maximum speed, in bytes per second, or 0 for unlimited. + * @mode: Whether to collapse all images in the chain to the target. + * @on_source_error: The action to take upon error reading from the source. + * @on_target_error: The action to take upon error writing to the target. + * @cb: Completion function for the job. + * @opaque: Opaque pointer value passed to @cb. + * @errp: Error object. + * + * Start a mirroring operation on @bs. Clusters that are allocated + * in @bs will be written to @bs until the job is cancelled or + * manually completed. At the end of a successful mirroring job, + * @bs will be switched to read from @target. + */ +void mirror_start(BlockDriverState *bs, BlockDriverState *target, + int64_t speed, MirrorSyncMode mode, + BlockdevOnError on_source_error, + BlockdevOnError on_target_error, + BlockDriverCompletionFunc *cb, + void *opaque, Error **errp); + +#endif /* BLOCK_INT_H */ |