xfs: add a new xfs_iext_lookup_extent_before helper

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This helper looks up the last extent the covers space before the passed
in block number.  This is useful for truncate and similar operations that
operate backwards over the extent list.  For xfs_bunmapi it also is
a slight optimization as we can return early if there are not extents
at or below the end of the to be truncated range.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Christoph Hellwig 2017-10-23 16:32:39 -07:00 • committed by Darrick J. Wong

parent 211e95bbab

commit dc56015faf

4 changed files with 39 additions and 32 deletions

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27

fs/xfs/libxfs/xfs_bmap.c

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21

fs/xfs/libxfs/xfs_inode_fork.c

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4

fs/xfs/libxfs/xfs_inode_fork.h

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19

fs/xfs/xfs_reflink.c

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