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cow: convert to .bdrv_co_is_allocated()

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The cow block driver does not keep internal state for cluster lookups.
This means it is safe to perform cluster lookups in coroutine context
without risk of race conditions that corrupt internal state.

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 2011-11-14 12:44:24 +00:00 committed by Kevin Wolf
parent e850b35a1f
commit 81145834d3
1 changed files with 4 additions and 4 deletions
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8
block/cow.c
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@ -132,8 +132,8 @@ static inline int is_bit_set(BlockDriverState *bs, int64_t bitnum)
/* Return true if first block has been changed (ie. current version is
* in COW file). Set the number of continuous blocks for which that
* is true. */
static int cow_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *num_same)
static int coroutine_fn cow_co_is_allocated(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *num_same)
{
int changed;
@ -178,7 +178,7 @@ static int cow_read(BlockDriverState *bs, int64_t sector_num,
int ret, n;
while (nb_sectors > 0) {
if (cow_is_allocated(bs, sector_num, nb_sectors, &n)) {
if (bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
ret = bdrv_pread(bs->file,
s->cow_sectors_offset + sector_num * 512,
buf, n * 512);
@ -335,7 +335,7 @@ static BlockDriver bdrv_cow = {
.bdrv_read = cow_co_read,
.bdrv_write = cow_co_write,
.bdrv_co_flush_to_disk = cow_co_flush,
.bdrv_is_allocated = cow_is_allocated,
.bdrv_co_is_allocated = cow_co_is_allocated,
.create_options = cow_create_options,
};