@@ -2611,52 +2611,19 @@ int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t offset,
* at 'offset + *pnum' may return the same allocation status (in other
* words, the result is not necessarily the maximum possible range);
* but 'pnum' will only be 0 when end of file is reached.
- *
*/
int bdrv_is_allocated_above(BlockDriverState *top,
BlockDriverState *base,
bool include_base, int64_t offset,
int64_t bytes, int64_t *pnum)
{
- BlockDriverState *intermediate;
- int ret;
- int64_t n = bytes;
-
- assert(base || !include_base);
-
- intermediate = top;
- while (include_base || intermediate != base) {
- int64_t pnum_inter;
- int64_t size_inter;
-
- assert(intermediate);
- ret = bdrv_is_allocated(intermediate, offset, bytes, &pnum_inter);
- if (ret < 0) {
- return ret;
- }
- if (ret) {
- *pnum = pnum_inter;
- return 1;
- }
-
- size_inter = bdrv_getlength(intermediate);
- if (size_inter < 0) {
- return size_inter;
- }
- if (n > pnum_inter &&
- (intermediate == top || offset + pnum_inter < size_inter)) {
- n = pnum_inter;
- }
-
- if (intermediate == base) {
- break;
- }
-
- intermediate = backing_bs(intermediate);
+ int ret = bdrv_common_block_status_above(top, base, include_base, false,
+ offset, bytes, pnum, NULL, NULL);
+ if (ret < 0) {
+ return ret;
}
- *pnum = n;
- return 0;
+ return !!(ret & BDRV_BLOCK_ALLOCATED);
}
typedef struct BdrvVmstateCo {
bdrv_is_allocated_above wrongly handles short backing files: it reports after-EOF space as UNALLOCATED which is wrong, as on read the data is generated on the level of short backing file (if all overlays has unallocated area at that place). Reusing bdrv_common_block_status_above fixes the issue and unifies code path. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> --- block/io.c | 43 +++++-------------------------------------- 1 file changed, 5 insertions(+), 38 deletions(-)