f9092b108f
savevm.c keeps a pointer to the snapshot block device. If you manage
to get that device deleted, the pointer dangles, and the next snapshot
operation will crash & burn. Unplugging a guest device that uses it
does the trick:
$ MALLOC_PERTURB_=234 qemu-system-x86_64 [...]
QEMU 0.12.50 monitor - type 'help' for more information
(qemu) info snapshots
No available block device supports snapshots
(qemu) drive_add auto if=none,file=tmp.qcow2
OK
(qemu) device_add usb-storage,id=foo,drive=none1
(qemu) info snapshots
Snapshot devices: none1
Snapshot list (from none1):
ID TAG VM SIZE DATE VM CLOCK
(qemu) device_del foo
(qemu) info snapshots
Snapshot devices:
Segmentation fault (core dumped)
Move management of that pointer to block.c, and zap it when the device
it points becomes unusable.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
279 lines
10 KiB
C
279 lines
10 KiB
C
#ifndef BLOCK_H
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#define BLOCK_H
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#include "qemu-aio.h"
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#include "qemu-common.h"
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#include "qemu-option.h"
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#include "qobject.h"
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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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#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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#define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
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#define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
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#define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
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#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB)
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#define BDRV_SECTOR_BITS 9
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#define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
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#define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
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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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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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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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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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void bdrv_init(void);
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void bdrv_init_with_whitelist(void);
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BlockDriver *bdrv_find_protocol(const char *filename);
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BlockDriver *bdrv_find_format(const char *format_name);
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
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int bdrv_create(BlockDriver *drv, const char* filename,
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QEMUOptionParameter *options);
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
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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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int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
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BlockDriver *drv);
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void bdrv_close(BlockDriverState *bs);
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int bdrv_attach(BlockDriverState *bs, DeviceState *qdev);
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void bdrv_detach(BlockDriverState *bs, DeviceState *qdev);
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DeviceState *bdrv_get_attached(BlockDriverState *bs);
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int bdrv_check(BlockDriverState *bs);
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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_pwrite_sync(BlockDriverState *bs, int64_t offset,
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const void *buf, int count);
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int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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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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void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
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void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
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int bdrv_commit(BlockDriverState *bs);
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void bdrv_commit_all(void);
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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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void bdrv_register(BlockDriver *bdrv);
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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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typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
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int sector_num);
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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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BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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void bdrv_aio_cancel(BlockDriverAIOCB *acb);
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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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/* sg packet commands */
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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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/* Ensure contents are flushed to disk. */
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void bdrv_flush(BlockDriverState *bs);
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void bdrv_flush_all(void);
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void bdrv_close_all(void);
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int bdrv_has_zero_init(BlockDriverState *bs);
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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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#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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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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int bdrv_is_removable(BlockDriverState *bs);
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int bdrv_is_read_only(BlockDriverState *bs);
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int bdrv_is_sg(BlockDriverState *bs);
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int bdrv_enable_write_cache(BlockDriverState *bs);
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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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int bdrv_eject(BlockDriverState *bs, int eject_flag);
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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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BlockDriverState *bdrv_next(BlockDriverState *bs);
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void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
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void *opaque);
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int bdrv_is_encrypted(BlockDriverState *bs);
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int bdrv_key_required(BlockDriverState *bs);
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int bdrv_set_key(BlockDriverState *bs, const char *key);
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int bdrv_query_missing_keys(void);
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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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const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
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void bdrv_get_backing_filename(BlockDriverState *bs,
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char *filename, int filename_size);
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int bdrv_can_snapshot(BlockDriverState *bs);
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BlockDriverState *bdrv_snapshots(void);
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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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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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#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
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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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void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
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int nr_sectors);
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int64_t bdrv_get_dirty_count(BlockDriverState *bs);
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typedef enum {
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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,
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BLKDBG_REFBLOCK_ALLOC_WRITE,
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BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
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BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
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BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
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BLKDBG_CLUSTER_ALLOC,
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BLKDBG_CLUSTER_ALLOC_BYTES,
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BLKDBG_CLUSTER_FREE,
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BLKDBG_EVENT_MAX,
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} BlkDebugEvent;
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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);
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#endif
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