xfs: only grab shared inode locks for source file during reflink

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Reflink and dedupe operations remap blocks from a source file into a
destination file.  The destination file needs exclusive locks on all
levels because we're updating its block map, but the source file isn't
undergoing any block map changes so we can use a shared lock.

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

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Darrick J. Wong 2018-01-18 14:07:53 -08:00

parent 7c2d238ac6

commit 01c2e13dca

2 changed files with 20 additions and 10 deletions

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25

fs/xfs/xfs_reflink.c

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5

include/linux/fs.h

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