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block: Introduce bdrv_writev_vmstate 

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2013-04-05 21:27:53 +02:00 committed by Stefan Hajnoczi
parent e2ec3f9768
commit cf8074b382
5 changed files with 42 additions and 13 deletions
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25
block.c
View File

@ -3183,14 +3183,29 @@ int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
int64_t pos, int size)
{
QEMUIOVector qiov;
struct iovec iov = {
.iov_base = (void *) buf,
.iov_len = size,
};
qemu_iovec_init_external(&qiov, &iov, 1);
return bdrv_writev_vmstate(bs, &qiov, pos);
}
int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos)
{
BlockDriver *drv = bs->drv;
if (!drv)
if (!drv) {
return -ENOMEDIUM;
if (drv->bdrv_save_vmstate)
return drv->bdrv_save_vmstate(bs, buf, pos, size);
if (bs->file)
return bdrv_save_vmstate(bs->file, buf, pos, size);
} else if (drv->bdrv_save_vmstate) {
return drv->bdrv_save_vmstate(bs, qiov, pos);
} else if (bs->file) {
return bdrv_writev_vmstate(bs->file, qiov, pos);
}
return -ENOTSUP;
}

12
block/qcow2.c
View File

@ -1652,18 +1652,24 @@ static void dump_refcounts(BlockDriverState *bs)
}
#endif
static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
int64_t pos, int size)
static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t pos)
{
BDRVQcowState *s = bs->opaque;
int growable = bs->growable;
int ret;
void *buf;
buf = qemu_blockalign(bs, qiov->size);
qemu_iovec_to_buf(qiov, 0, buf, qiov->size);
BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE);
bs->growable = 1;
ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size);
ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, qiov->size);
bs->growable = growable;
qemu_vfree(buf);
return ret;
}

13
block/sheepdog.c
View File

@ -2054,12 +2054,19 @@ cleanup:
return ret;
}
static int sd_save_vmstate(BlockDriverState *bs, const uint8_t *data,
int64_t pos, int size)
static int sd_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t pos)
{
BDRVSheepdogState *s = bs->opaque;
void *buf;
int ret;
return do_load_save_vmstate(s, (uint8_t *)data, pos, size, 0);
buf = qemu_blockalign(bs, qiov->size);
qemu_iovec_to_buf(qiov, 0, buf, qiov->size);
ret = do_load_save_vmstate(s, (uint8_t *) buf, pos, qiov->size, 0);
qemu_vfree(buf);
return ret;
}
static int sd_load_vmstate(BlockDriverState *bs, uint8_t *data,

1
include/block/block.h
View File

@ -348,6 +348,7 @@ void path_combine(char *dest, int dest_size,
const char *base_path,
const char *filename);
int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
int64_t pos, int size);

4
include/block/block_int.h
View File

@ -164,8 +164,8 @@ struct BlockDriver {
const char *snapshot_name);
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_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t pos);
int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
int64_t pos, int size);