xfs: Check for extent overflow when writing to unwritten extent

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A write to a sub-interval of an existing unwritten extent causes
the original extent to be split into 3 extents
i.e. | Unwritten | Real | Unwritten |
Hence extent count can increase by 2.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Henderson <allison.henderson@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 3a19bb147c

commit c442f3086d

2 changed files with 14 additions and 0 deletions

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9

fs/xfs/libxfs/xfs_inode_fork.h

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5

fs/xfs/xfs_iomap.c

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