xfs: introduce interval queries on btrees

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Create a function to enable querying of btree records mapping to a
range of keys.  This will be used in subsequent patches to allow
querying the reverse mapping btree to find the extents mapped to a
range of physical blocks, though the generic code can be used for
any range query.

The overlapped query range function needs to use the btree get_block
helper because the root block could be an inode, in which case
bc_bufs[nlevels-1] will be NULL.

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

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Darrick J. Wong 2016-08-03 11:10:21 +10:00 • committed by Dave Chinner

parent 2c813ad66a

commit 105f7d83db

3 changed files with 282 additions and 5 deletions

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264

fs/xfs/libxfs/xfs_btree.c

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22

fs/xfs/libxfs/xfs_btree.h

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1

fs/xfs/xfs_trace.h

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