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cow: use bdrv_co_is_allocated()

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Now that bdrv_co_is_allocated() is available we can use it instead of
the synchronous bdrv_is_allocated() interface.  This is a follow-up that
Kevin Wolf <kwolf@redhat.com> pointed out after applying the series that
introduces bdrv_co_is_allocated().

It is safe to make cow_read() a coroutine_fn because its only caller is
a coroutine_fn.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2011-11-23 15:00:04 +00:00 committed by Kevin Wolf
parent fb0490f69f
commit e94d138733
1 changed files with 3 additions and 3 deletions
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6
block/cow.c
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@ -171,14 +171,14 @@ static int cow_update_bitmap(BlockDriverState *bs, int64_t sector_num,
return error;
}
static int cow_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
static int coroutine_fn cow_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
BDRVCowState *s = bs->opaque;
int ret, n;
while (nb_sectors > 0) {
if (bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
if (bdrv_co_is_allocated(bs, sector_num, nb_sectors, &n)) {
ret = bdrv_pread(bs->file,
s->cow_sectors_offset + sector_num * 512,
buf, n * 512);