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xfs: implement deferred bmbt map/unmap operations

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Implement deferred versions of the inode block map/unmap functions.
These will be used in subsequent patches to make reflink operations
atomic.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2016-10-03 09:11:28 -07:00
commit 9f3afb57d5
9 changed files with 393 additions and 3 deletions
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