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block: Fix bdrv_co_truncate overlap check

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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: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2018-07-10 14:31:23 +08:00 committed by Kevin Wolf
parent 0eb1e89112
commit 5416a11eb5
1 changed files with 2 additions and 1 deletions
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3
block/io.c
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@ -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