2007-11-11 03:51:17 +01:00
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#ifndef BLOCK_H
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#define BLOCK_H
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2008-09-22 21:17:18 +02:00
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#include "qemu-aio.h"
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2009-01-22 17:59:24 +01:00
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#include "qemu-common.h"
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2009-05-18 16:42:10 +02:00
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#include "qemu-option.h"
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2009-12-10 20:16:06 +01:00
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#include "qobject.h"
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2008-09-22 21:17:18 +02:00
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2007-11-11 03:51:17 +01:00
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/* block.c */
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typedef struct BlockDriver BlockDriver;
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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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} BlockDriverInfo;
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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 choosen name */
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uint32_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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#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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2008-10-14 16:42:54 +02:00
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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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2009-08-20 16:58:35 +02:00
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#define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
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2010-01-12 12:55:16 +01:00
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#define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
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2010-05-26 17:51:49 +02:00
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#define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
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2008-10-14 16:42:54 +02:00
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2009-06-30 13:06:04 +02:00
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#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB)
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2007-11-11 03:51:17 +01:00
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2009-11-30 18:21:19 +01:00
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#define BDRV_SECTOR_BITS 9
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2010-05-27 15:46:55 +02:00
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#define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
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2010-05-01 08:23:32 +02:00
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#define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
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2009-11-30 18:21:19 +01:00
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2010-06-02 18:55:17 +02:00
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typedef enum {
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BLOCK_ERR_REPORT, BLOCK_ERR_IGNORE, BLOCK_ERR_STOP_ENOSPC,
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BLOCK_ERR_STOP_ANY
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} BlockErrorAction;
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2010-02-03 15:41:01 +01:00
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typedef enum {
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BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
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} BlockMonEventAction;
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void bdrv_mon_event(const BlockDriverState *bdrv,
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BlockMonEventAction action, int is_read);
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2009-12-10 20:16:06 +01:00
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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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2009-12-10 20:16:07 +01:00
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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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2007-11-11 03:51:17 +01:00
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void bdrv_init(void);
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2009-10-27 18:41:44 +01:00
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void bdrv_init_with_whitelist(void);
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2010-05-26 04:35:36 +02:00
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BlockDriver *bdrv_find_protocol(const char *filename);
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2007-11-11 03:51:17 +01:00
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BlockDriver *bdrv_find_format(const char *format_name);
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2009-10-27 18:41:44 +01:00
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
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2009-05-18 16:42:10 +02:00
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int bdrv_create(BlockDriver *drv, const char* filename,
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QEMUOptionParameter *options);
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2010-04-07 22:30:24 +02:00
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
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2007-11-11 03:51:17 +01:00
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BlockDriverState *bdrv_new(const char *device_name);
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void bdrv_delete(BlockDriverState *bs);
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int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
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2010-03-31 14:40:27 +02:00
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int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
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BlockDriver *drv);
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2007-11-11 03:51:17 +01:00
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void bdrv_close(BlockDriverState *bs);
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2009-04-22 01:11:50 +02:00
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int bdrv_check(BlockDriverState *bs);
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2007-11-11 03:51:17 +01:00
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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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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_truncate(BlockDriverState *bs, int64_t offset);
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int64_t bdrv_getlength(BlockDriverState *bs);
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2007-12-17 02:35:20 +01:00
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void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
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2008-11-25 22:50:24 +01:00
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void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
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2007-11-11 03:51:17 +01:00
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int bdrv_commit(BlockDriverState *bs);
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2010-06-02 18:55:18 +02:00
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void bdrv_commit_all(void);
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2010-01-12 12:55:17 +01:00
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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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2009-05-10 00:03:42 +02:00
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void bdrv_register(BlockDriver *bdrv);
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2007-11-11 03:51:17 +01:00
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/* async block I/O */
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typedef struct BlockDriverAIOCB BlockDriverAIOCB;
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typedef void BlockDriverCompletionFunc(void *opaque, int ret);
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2009-11-02 14:40:41 +01:00
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typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
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int sector_num);
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2009-01-22 17:59:24 +01:00
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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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2009-09-04 19:01:49 +02:00
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BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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2007-11-11 03:51:17 +01:00
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void bdrv_aio_cancel(BlockDriverAIOCB *acb);
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2009-09-09 17:53:37 +02:00
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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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2009-03-12 20:57:08 +01:00
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/* sg packet commands */
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2009-03-28 18:28:41 +01:00
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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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2009-03-12 20:57:08 +01:00
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2007-11-11 03:51:17 +01:00
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/* Ensure contents are flushed to disk. */
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void bdrv_flush(BlockDriverState *bs);
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2008-10-06 15:55:43 +02:00
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void bdrv_flush_all(void);
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2010-05-28 04:44:57 +02:00
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void bdrv_close_all(void);
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2008-10-06 15:55:43 +02:00
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2010-04-14 17:30:35 +02:00
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int bdrv_has_zero_init(BlockDriverState *bs);
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2008-06-05 23:53:49 +02:00
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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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2007-11-11 03:51:17 +01:00
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#define BDRV_TYPE_HD 0
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#define BDRV_TYPE_CDROM 1
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#define BDRV_TYPE_FLOPPY 2
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#define BIOS_ATA_TRANSLATION_AUTO 0
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#define BIOS_ATA_TRANSLATION_NONE 1
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#define BIOS_ATA_TRANSLATION_LBA 2
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#define BIOS_ATA_TRANSLATION_LARGE 3
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#define BIOS_ATA_TRANSLATION_RECHS 4
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void bdrv_set_geometry_hint(BlockDriverState *bs,
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int cyls, int heads, int secs);
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void bdrv_set_type_hint(BlockDriverState *bs, int type);
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void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
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void bdrv_get_geometry_hint(BlockDriverState *bs,
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int *pcyls, int *pheads, int *psecs);
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int bdrv_get_type_hint(BlockDriverState *bs);
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int bdrv_get_translation_hint(BlockDriverState *bs);
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2010-06-02 18:55:17 +02:00
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void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
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BlockErrorAction on_write_error);
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BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
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2007-11-11 03:51:17 +01:00
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int bdrv_is_removable(BlockDriverState *bs);
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int bdrv_is_read_only(BlockDriverState *bs);
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2007-12-24 17:10:43 +01:00
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int bdrv_is_sg(BlockDriverState *bs);
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2009-09-04 19:01:15 +02:00
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int bdrv_enable_write_cache(BlockDriverState *bs);
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2007-11-11 03:51:17 +01:00
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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_is_locked(BlockDriverState *bs);
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void bdrv_set_locked(BlockDriverState *bs, int locked);
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2009-05-27 11:06:11 +02:00
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int bdrv_eject(BlockDriverState *bs, int eject_flag);
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2007-11-11 03:51:17 +01:00
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void bdrv_set_change_cb(BlockDriverState *bs,
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void (*change_cb)(void *opaque), void *opaque);
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void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
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BlockDriverState *bdrv_find(const char *name);
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2010-06-02 18:55:20 +02:00
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BlockDriverState *bdrv_next(BlockDriverState *bs);
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2009-03-06 00:00:43 +01:00
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void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
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void *opaque);
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2007-11-11 03:51:17 +01:00
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int bdrv_is_encrypted(BlockDriverState *bs);
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2009-03-06 00:01:01 +01:00
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int bdrv_key_required(BlockDriverState *bs);
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2007-11-11 03:51:17 +01:00
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int bdrv_set_key(BlockDriverState *bs, const char *key);
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2009-03-06 00:01:01 +01:00
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int bdrv_query_missing_keys(void);
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2007-11-11 03:51:17 +01:00
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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_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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2009-03-06 00:00:48 +01:00
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const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
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2007-11-11 03:51:17 +01:00
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void bdrv_get_backing_filename(BlockDriverState *bs,
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char *filename, int filename_size);
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savevm: Really verify if a drive supports snapshots
Both bdrv_can_snapshot() and bdrv_has_snapshot() does not work as advertized.
First issue: Their names implies different porpouses, but they do the same thing
and have exactly the same code. Maybe copied and pasted and forgotten?
bdrv_has_snapshot() is called in various places for actually checking if there
is snapshots or not.
Second issue: the way bdrv_can_snapshot() verifies if a block driver supports or
not snapshots does not catch all cases. E.g.: a raw image.
So when do_savevm() is called, first thing it does is to set a global
BlockDriverState to save the VM memory state calling get_bs_snapshots().
static BlockDriverState *get_bs_snapshots(void)
{
BlockDriverState *bs;
DriveInfo *dinfo;
if (bs_snapshots)
return bs_snapshots;
QTAILQ_FOREACH(dinfo, &drives, next) {
bs = dinfo->bdrv;
if (bdrv_can_snapshot(bs))
goto ok;
}
return NULL;
ok:
bs_snapshots = bs;
return bs;
}
bdrv_can_snapshot() may return a BlockDriverState that does not support
snapshots and do_savevm() goes on.
Later on in do_savevm(), we find:
QTAILQ_FOREACH(dinfo, &drives, next) {
bs1 = dinfo->bdrv;
if (bdrv_has_snapshot(bs1)) {
/* Write VM state size only to the image that contains the state */
sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
ret = bdrv_snapshot_create(bs1, sn);
if (ret < 0) {
monitor_printf(mon, "Error while creating snapshot on '%s'\n",
bdrv_get_device_name(bs1));
}
}
}
bdrv_has_snapshot(bs1) is not checking if the device does support or has
snapshots as explained above. Only in bdrv_snapshot_create() the device is
actually checked for snapshot support.
So, in cases where the first device supports snapshots, and the second does not,
the snapshot on the first will happen anyways. I believe this is not a good
behavior. It should be an all or nothing process.
This patch addresses these issues by making bdrv_can_snapshot() actually do
what it must do and enforces better tests to avoid errors in the middle of
do_savevm(). bdrv_has_snapshot() is removed and replaced by bdrv_can_snapshot()
where appropriate.
bdrv_can_snapshot() was moved from savevm.c to block.c. It makes more sense to me.
The loadvm_state() function was updated too to enforce that when loading a VM at
least all writable devices must support snapshots too.
Signed-off-by: Miguel Di Ciurcio Filho <miguel.filho@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-06-08 15:40:55 +02:00
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int bdrv_can_snapshot(BlockDriverState *bs);
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2007-11-11 03:51:17 +01:00
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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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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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2009-07-10 23:11:57 +02:00
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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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2009-04-05 21:10:55 +02:00
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2009-07-10 23:11:57 +02:00
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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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2009-04-05 21:10:55 +02:00
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2009-11-30 18:21:22 +01:00
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#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
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2009-11-30 18:21:19 +01:00
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2009-11-02 14:40:41 +01:00
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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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2009-11-30 18:21:19 +01:00
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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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2010-01-26 09:31:48 +01:00
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int64_t bdrv_get_dirty_count(BlockDriverState *bs);
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2010-03-15 17:27:00 +01:00
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typedef enum {
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2010-03-15 17:38:05 +01:00
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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,
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BLKDBG_READ_AIO,
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BLKDBG_READ_BACKING,
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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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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,
|
|
|
|
BLKDBG_REFBLOCK_ALLOC_WRITE,
|
|
|
|
BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
|
|
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|
BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
|
|
|
|
BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
|
|
|
|
|
|
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|
BLKDBG_CLUSTER_ALLOC,
|
|
|
|
BLKDBG_CLUSTER_ALLOC_BYTES,
|
|
|
|
BLKDBG_CLUSTER_FREE,
|
|
|
|
|
2010-03-15 17:27:00 +01:00
|
|
|
BLKDBG_EVENT_MAX,
|
|
|
|
} 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);
|
|
|
|
|
2007-11-11 03:51:17 +01:00
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|
#endif
|