![lirans@il.ibm.com](/assets/img/avatar_default.png)
To support live migration without shared storage we need to be able to trace writes to disk while migrating. This Patch expose dirty block tracking per device to be polled from upper layer. Changes from v4: - Register dirty tracking for each block device. - Minor coding style issues. - Block.c will now manage a dirty bitmap per device once bdrv_set_dirty_tracking() is called. Bitmap is polled by the upper layer (block-migration.c). Signed-off-by: Liran Schour <lirans@il.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
200 lines
7.4 KiB
C
200 lines
7.4 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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#define BLOCK_FLAG_ENCRYPT 1
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#define BLOCK_FLAG_COMPRESS 2
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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_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, 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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void (*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_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_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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/* 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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/* Returns number of errors in image, -errno for internal errors */
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int (*bdrv_check)(BlockDriverState* bs);
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struct BlockDriver *next;
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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 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 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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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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/* 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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/* 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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char device_name[32];
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int dirty_tracking;
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uint8_t *dirty_bitmap;
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BlockDriverState *next;
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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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extern BlockDriverState *bdrv_first;
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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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#endif /* BLOCK_INT_H */
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