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block: add bdrv_co_is_allocated() interface

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This patch introduces the public bdrv_co_is_allocated() interface which
can be used to query image allocation status while the VM is running.

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 12:44:26 +00:00 • committed by Kevin Wolf
parent 6aebab140d
commit 060f51c9de
2 changed files with 26 additions and 13 deletions
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37
block.c
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@ -1896,17 +1896,6 @@ typedef struct BdrvCoIsAllocatedData {
bool done;
} BdrvCoIsAllocatedData;
/* Coroutine wrapper for bdrv_is_allocated() */
static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
{
BdrvCoIsAllocatedData *data = opaque;
BlockDriverState *bs = data->bs;
data->ret = bs->drv->bdrv_co_is_allocated(bs, data->sector_num,
data->nb_sectors, data->pnum);
data->done = true;
}
/*
* Returns true iff the specified sector is present in the disk image. Drivers
* not implementing the functionality are assumed to not support backing files,
@ -1918,8 +1907,8 @@ static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
*
* 'nb_sectors' is the max value 'pnum' should be set to.
*/
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int *pnum)
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum)
{
if (!bs->drv->bdrv_co_is_allocated) {
int64_t n;
@ -1932,6 +1921,28 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
return 1;
}
return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum);
}
/* Coroutine wrapper for bdrv_is_allocated() */
static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
{
BdrvCoIsAllocatedData *data = opaque;
BlockDriverState *bs = data->bs;
data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors,
data->pnum);
data->done = true;
}
/*
* Synchronous wrapper around bdrv_co_is_allocated().
*
* See bdrv_co_is_allocated() for details.
*/
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int *pnum)
{
Coroutine *co;
BdrvCoIsAllocatedData data = {
.bs = bs,