262 lines
9.7 KiB
C
262 lines
9.7 KiB
C
/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef BLOCK_INT_H
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#define BLOCK_INT_H
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#include "block.h"
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#include "qemu-option.h"
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#include "qemu-queue.h"
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#define BLOCK_FLAG_ENCRYPT 1
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#define BLOCK_FLAG_COMPAT6 4
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#define BLOCK_OPT_SIZE "size"
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#define BLOCK_OPT_ENCRYPT "encryption"
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#define BLOCK_OPT_COMPAT6 "compat6"
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#define BLOCK_OPT_BACKING_FILE "backing_file"
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#define BLOCK_OPT_BACKING_FMT "backing_fmt"
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#define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
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#define BLOCK_OPT_TABLE_SIZE "table_size"
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#define BLOCK_OPT_PREALLOC "preallocation"
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typedef struct AIOPool {
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void (*cancel)(BlockDriverAIOCB *acb);
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int aiocb_size;
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BlockDriverAIOCB *free_aiocb;
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} AIOPool;
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struct BlockDriver {
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const char *format_name;
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int instance_size;
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int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
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int (*bdrv_probe_device)(const char *filename);
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int (*bdrv_open)(BlockDriverState *bs, int flags);
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int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags);
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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_write)(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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void (*bdrv_close)(BlockDriverState *bs);
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int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
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int (*bdrv_flush)(BlockDriverState *bs);
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int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum);
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int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
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int (*bdrv_make_empty)(BlockDriverState *bs);
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/* aio */
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BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, 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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int (*bdrv_discard)(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors);
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int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
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int num_reqs);
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int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,
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BlockRequest *b);
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const char *protocol_name;
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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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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_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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int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
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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_change_backing_file)(BlockDriverState *bs,
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const char *backing_file, const char *backing_fmt);
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/* removable device specific */
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int (*bdrv_is_inserted)(BlockDriverState *bs);
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int (*bdrv_media_changed)(BlockDriverState *bs);
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int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
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int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
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/* to control generic scsi devices */
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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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/* List of options for creating images, terminated by name == NULL */
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QEMUOptionParameter *create_options;
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/*
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* Returns 0 for completed check, -errno for internal errors.
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* The check results are stored in result.
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*/
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int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result);
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void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
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/*
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* Returns 1 if newly created images are guaranteed to contain only
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* zeros, 0 otherwise.
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*/
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int (*bdrv_has_zero_init)(BlockDriverState *bs);
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QLIST_ENTRY(BlockDriver) list;
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};
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struct BlockDriverState {
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int64_t total_sectors; /* if we are reading a disk image, give its
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size in sectors */
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int read_only; /* if true, the media is read only */
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int keep_read_only; /* if true, the media was requested to stay read only */
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int open_flags; /* flags used to open the file, re-used for re-open */
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int removable; /* if true, the media can be removed */
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int locked; /* if true, the media cannot temporarily be ejected */
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int tray_open; /* if true, the virtual tray is open */
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int encrypted; /* if true, the media is encrypted */
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int valid_key; /* if true, a valid encryption key has been set */
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int sg; /* if true, the device is a /dev/sg* */
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/* event callback when inserting/removing */
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void (*change_cb)(void *opaque);
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void *change_opaque;
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BlockDriver *drv; /* NULL means no media */
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void *opaque;
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DeviceState *peer;
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char filename[1024];
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char backing_file[1024]; /* if non zero, the image is a diff of
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this file image */
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char backing_format[16]; /* if non-zero and backing_file exists */
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int is_temporary;
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int media_changed;
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BlockDriverState *backing_hd;
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BlockDriverState *file;
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/* async read/write emulation */
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void *sync_aiocb;
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/* I/O stats (display with "info blockstats"). */
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uint64_t rd_bytes;
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uint64_t wr_bytes;
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uint64_t rd_ops;
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uint64_t wr_ops;
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uint64_t wr_highest_sector;
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/* Whether the disk can expand beyond total_sectors */
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int growable;
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/* the memory alignment required for the buffers handled by this driver */
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int buffer_alignment;
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/* do we need to tell the quest if we have a volatile write cache? */
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int enable_write_cache;
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/* NOTE: the following infos are only hints for real hardware
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drivers. They are not used by the block driver */
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int cyls, heads, secs, translation;
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int type;
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BlockErrorAction on_read_error, on_write_error;
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char device_name[32];
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unsigned long *dirty_bitmap;
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int64_t dirty_count;
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QTAILQ_ENTRY(BlockDriverState) list;
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void *private;
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};
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struct BlockDriverAIOCB {
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AIOPool *pool;
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BlockDriverState *bs;
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BlockDriverCompletionFunc *cb;
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void *opaque;
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BlockDriverAIOCB *next;
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};
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void get_tmp_filename(char *filename, int size);
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void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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void qemu_aio_release(void *p);
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void *qemu_blockalign(BlockDriverState *bs, size_t size);
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#ifdef _WIN32
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int is_windows_drive(const char *filename);
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#endif
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typedef struct BlockConf {
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BlockDriverState *bs;
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uint16_t physical_block_size;
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uint16_t logical_block_size;
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uint16_t min_io_size;
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uint32_t opt_io_size;
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int32_t bootindex;
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uint32_t discard_granularity;
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} BlockConf;
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static inline unsigned int get_physical_block_exp(BlockConf *conf)
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{
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unsigned int exp = 0, size;
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for (size = conf->physical_block_size;
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size > conf->logical_block_size;
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size >>= 1) {
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exp++;
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}
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return exp;
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}
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#define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
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DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \
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DEFINE_PROP_UINT16("logical_block_size", _state, \
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_conf.logical_block_size, 512), \
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DEFINE_PROP_UINT16("physical_block_size", _state, \
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_conf.physical_block_size, 512), \
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DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \
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DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \
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DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1), \
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DEFINE_PROP_UINT32("discard_granularity", _state, \
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_conf.discard_granularity, 0)
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#endif /* BLOCK_INT_H */
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