xfs: Check for extent overflow when moving extent from cow to data fork

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Moving an extent to data fork can cause a sub-interval of an existing
extent to be unmapped. This will increase extent count by 1. Mapping in
the new extent can increase the extent count by 1 again i.e.
 | Old extent | New extent | Old extent |
Hence number of extents increases 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 c442f3086d

commit 5f1d5bbfb2

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_reflink.c

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