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replace bdrv_{get, put}_buffer with bdrv_{load, save}_vmstate

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The VM state offset is a concept internal to the image format.  Replace
the old bdrv_{get,put}_buffer method that require an index into the
image file that is constructed from the VM state offset and an offset
into the vmstate with the bdrv_{load,save}_vmstate that just take an
offset into the VM state.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Christoph Hellwig 2009-07-10 23:11:57 +02:00 • committed by Anthony Liguori
parent e1e8f35a4f
commit 45566e9c99
5 changed files with 37 additions and 60 deletions
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22
block/qcow2.c
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@ -890,12 +890,16 @@ static void qcow_flush(BlockDriverState *bs)
bdrv_flush(s->hd);
}
static int64_t qcow_vm_state_offset(BDRVQcowState *s)
{
return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
}
static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
BDRVQcowState *s = bs->opaque;
bdi->cluster_size = s->cluster_size;
bdi->vm_state_offset = (int64_t)s->l1_vm_state_index <<
(s->cluster_bits + s->l2_bits);
bdi->vm_state_offset = qcow_vm_state_offset(s);
return 0;
}
@ -925,26 +929,28 @@ static void dump_refcounts(BlockDriverState *bs)
}
#endif
static int qcow_put_buffer(BlockDriverState *bs, const uint8_t *buf,
static int qcow_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
int64_t pos, int size)
{
BDRVQcowState *s = bs->opaque;
int growable = bs->growable;
bs->growable = 1;
bdrv_pwrite(bs, pos, buf, size);
bdrv_pwrite(bs, qcow_vm_state_offset(s) + pos, buf, size);
bs->growable = growable;
return size;
}
static int qcow_get_buffer(BlockDriverState *bs, uint8_t *buf,
static int qcow_load_vmstate(BlockDriverState *bs, uint8_t *buf,
int64_t pos, int size)
{
BDRVQcowState *s = bs->opaque;
int growable = bs->growable;
int ret;
bs->growable = 1;
ret = bdrv_pread(bs, pos, buf, size);
ret = bdrv_pread(bs, qcow_vm_state_offset(s) + pos, buf, size);
bs->growable = growable;
return ret;
@ -1001,8 +1007,8 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_snapshot_list = qcow2_snapshot_list,
.bdrv_get_info = qcow_get_info,
.bdrv_put_buffer = qcow_put_buffer,
.bdrv_get_buffer = qcow_get_buffer,
.bdrv_save_vmstate = qcow_save_vmstate,
.bdrv_load_vmstate = qcow_load_vmstate,
.create_options = qcow_create_options,
.bdrv_check = qcow_check,