xfs: Check for extent overflow when remapping an extent

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Remapping an extent involves unmapping the existing extent and mapping
in the new extent. When unmapping, an extent containing the entire unmap
range can be split into two extents,
i.e. | Old extent | hole | Old extent |
Hence extent count increases by 1.

Mapping in the new extent into the destination file can increase the
extent count by 1.

Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Chandan Babu R 2021-01-22 16:48:14 -08:00 • committed by Darrick J. Wong

parent 5f1d5bbfb2

commit ee898d78c3

1 changed files with 11 additions and 0 deletions

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fs/xfs/xfs_reflink.c

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