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| author | Denis V. Lunev <den@openvz.org> | 2016-05-17 12:15:42 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-05-19 16:45:31 +0200 |
| commit | f575f145f4fa97fdbb9bbb4df62dfeada3f15dc4 (patch) | |
| tree | 0e4ddab1eabc09e27f33e78a9dce275996526b00 /block/qcow2.c | |
| parent | b97511c7bc88bc487cacbfab349eb6023ae4f49b (diff) | |
| download | qemu-f575f145f4fa97fdbb9bbb4df62dfeada3f15dc4.tar.gz qemu-f575f145f4fa97fdbb9bbb4df62dfeada3f15dc4.tar.bz2 qemu-f575f145f4fa97fdbb9bbb4df62dfeada3f15dc4.zip | |
qcow2: fix condition in is_zero_cluster
We should check for (res & BDRV_BLOCK_ZERO) only. The situation when we
will have !(res & BDRV_BLOCK_DATA) and will not have BDRV_BLOCK_ZERO is
not possible for images with bdi.unallocated_blocks_are_zero == true.
For those images where it's false, however, it can happen and we must
not consider the data zeroed then or we would corrupt the image.
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 62febfc386..a6012dc793 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2412,7 +2412,7 @@ static bool is_zero_cluster(BlockDriverState *bs, int64_t start) BlockDriverState *file; int64_t res = bdrv_get_block_status_above(bs, NULL, start, s->cluster_sectors, &nr, &file); - return res >= 0 && ((res & BDRV_BLOCK_ZERO) || !(res & BDRV_BLOCK_DATA)); + return res >= 0 && (res & BDRV_BLOCK_ZERO); } static bool is_zero_cluster_top_locked(BlockDriverState *bs, int64_t start) |