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block: Add synchronous wrapper for bdrv_co_is_allocated_above 

There's no synchronous wrapper for bdrv_co_is_allocated_above function
so it's not possible to check for sector allocation in an image with
a backing file.

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Miroslav Rezanina 2013-02-13 09:09:39 +01:00 committed by Kevin Wolf
parent 7d81c1413c
commit b35b2bba5b
2 changed files with 41 additions and 0 deletions
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39
block.c
View File

@ -2681,6 +2681,7 @@ int bdrv_has_zero_init(BlockDriverState *bs)
typedef struct BdrvCoIsAllocatedData { typedef struct BdrvCoIsAllocatedData {
BlockDriverState *bs; BlockDriverState *bs;
BlockDriverState *base;
int64_t sector_num; int64_t sector_num;
int nb_sectors; int nb_sectors;
int *pnum; int *pnum;
@ -2813,6 +2814,44 @@ int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
return 0; return 0;
} }
/* Coroutine wrapper for bdrv_is_allocated_above() */
static void coroutine_fn bdrv_is_allocated_above_co_entry(void *opaque)
{
BdrvCoIsAllocatedData *data = opaque;
BlockDriverState *top = data->bs;
BlockDriverState *base = data->base;
data->ret = bdrv_co_is_allocated_above(top, base, data->sector_num,
data->nb_sectors, data->pnum);
data->done = true;
}
/*
* Synchronous wrapper around bdrv_co_is_allocated_above().
*
* See bdrv_co_is_allocated_above() for details.
*/
int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
int64_t sector_num, int nb_sectors, int *pnum)
{
Coroutine *co;
BdrvCoIsAllocatedData data = {
.bs = top,
.base = base,
.sector_num = sector_num,
.nb_sectors = nb_sectors,
.pnum = pnum,
.done = false,
};
co = qemu_coroutine_create(bdrv_is_allocated_above_co_entry);
qemu_coroutine_enter(co, &data);
while (!data.done) {
qemu_aio_wait();
}
return data.ret;
}
BlockInfo *bdrv_query_info(BlockDriverState *bs) BlockInfo *bdrv_query_info(BlockDriverState *bs)
{ {
BlockInfo *info = g_malloc0(sizeof(*info)); BlockInfo *info = g_malloc0(sizeof(*info));

2
include/block/block.h
View File

@ -280,6 +280,8 @@ int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
int bdrv_has_zero_init(BlockDriverState *bs); int bdrv_has_zero_init(BlockDriverState *bs);
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int *pnum); int *pnum);
int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
int64_t sector_num, int nb_sectors, int *pnum);
void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
BlockdevOnError on_write_error); BlockdevOnError on_write_error);