Btrfs: fix eof while discarding extents
We miscalculate the length of extents we're discarding, and it leads to an eof of device. Reported-by: Daniel Blueman <daniel@quora.org> Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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