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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: Fam Zheng <famz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@ -3136,7 +3136,8 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset,
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}
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bdrv_inc_in_flight(bs);
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tracked_request_begin(&req, bs, offset, new_bytes, BDRV_TRACKED_TRUNCATE);
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tracked_request_begin(&req, bs, offset - new_bytes, new_bytes,
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BDRV_TRACKED_TRUNCATE);
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/* If we are growing the image and potentially using preallocation for the
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* new area, we need to make sure that no write requests are made to it
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