/* * 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.h" #include "qemu-option.h" #include "qemu-queue.h" #define BLOCK_FLAG_ENCRYPT 1 #define BLOCK_FLAG_COMPRESS 2 #define BLOCK_FLAG_COMPAT6 4 #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_PREALLOC "preallocation" typedef struct AIOPool { void (*cancel)(BlockDriverAIOCB *acb); int aiocb_size; BlockDriverAIOCB *free_aiocb; } AIOPool; 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); 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); int (*bdrv_create)(const char *filename, QEMUOptionParameter *options); void (*bdrv_flush)(BlockDriverState *bs); int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum); 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); int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs, int num_reqs); int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a, BlockRequest *b); const char *protocol_name; int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); int64_t (*bdrv_getlength)(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_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); int (*bdrv_eject)(BlockDriverState *bs, int eject_flag); int (*bdrv_set_locked)(BlockDriverState *bs, int 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 number of errors in image, -errno for internal errors */ int (*bdrv_check)(BlockDriverState* bs); void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event); /* Set if newly created images are not guaranteed to contain only zeros */ int no_zero_init; QLIST_ENTRY(BlockDriver) list; }; 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 keep_read_only; /* if true, the media was requested to stay read only */ int open_flags; /* flags used to open the file, re-used for re-open */ int removable; /* if true, the media can be removed */ int locked; /* if true, the media cannot temporarily be ejected */ 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* */ /* event callback when inserting/removing */ void (*change_cb)(void *opaque); void *change_opaque; BlockDriver *drv; /* NULL means no media */ void *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; int media_changed; BlockDriverState *backing_hd; BlockDriverState *file; /* async read/write emulation */ void *sync_aiocb; /* I/O stats (display with "info blockstats"). */ uint64_t rd_bytes; uint64_t wr_bytes; uint64_t rd_ops; uint64_t wr_ops; 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 */ int cyls, heads, secs, translation; int type; BlockErrorAction on_read_error, on_write_error; char device_name[32]; unsigned long *dirty_bitmap; int64_t dirty_count; QTAILQ_ENTRY(BlockDriverState) list; void *private; }; struct BlockDriverAIOCB { AIOPool *pool; BlockDriverState *bs; BlockDriverCompletionFunc *cb; void *opaque; BlockDriverAIOCB *next; }; void get_tmp_filename(char *filename, int size); void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, BlockDriverCompletionFunc *cb, void *opaque); void qemu_aio_release(void *p); void *qemu_blockalign(BlockDriverState *bs, size_t size); #ifdef _WIN32 int is_windows_drive(const char *filename); #endif typedef struct BlockConf { BlockDriverState *bs; uint16_t physical_block_size; uint16_t logical_block_size; uint16_t min_io_size; uint32_t opt_io_size; } BlockConf; static inline unsigned int get_physical_block_exp(BlockConf *conf) { unsigned int exp = 0, size; for (size = conf->physical_block_size; size > conf->logical_block_size; size >>= 1) { exp++; } return exp; } #define DEFINE_BLOCK_PROPERTIES(_state, _conf) \ DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \ DEFINE_PROP_UINT16("logical_block_size", _state, \ _conf.logical_block_size, 512), \ DEFINE_PROP_UINT16("physical_block_size", _state, \ _conf.physical_block_size, 512), \ DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 512), \ DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 512) #endif /* BLOCK_INT_H */