Commit 5416a11e authored by Fam Zheng's avatar Fam Zheng Committed by Kevin Wolf
Browse files

block: Fix bdrv_co_truncate overlap check 



If we are growing the image and potentially using preallocation for the
new area, we need to make sure that no write requests are made to the
"preallocated" area which is [@old_size, @offset), not
[@offset, offset * 2 - @old_size).

Signed-off-by: default avatarFam Zheng <famz@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 0eb1e891

block/io.c

+2 −1
Original line number Diff line number Diff line
@@ -3136,7 +3136,8 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, 
    }



    bdrv_inc_in_flight(bs);

    tracked_request_begin(&req, bs, offset, new_bytes, BDRV_TRACKED_TRUNCATE);

    tracked_request_begin(&req, bs, offset - new_bytes, new_bytes,

                          BDRV_TRACKED_TRUNCATE);



    /* If we are growing the image and potentially using preallocation for the

     * new area, we need to make sure that no write requests are made to it