xfs: take the ilock shared if possible in xfs_file_iomap_begin

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We always just read the extent first, and will later lock exlusively
after first dropping the lock in case we actually allocate blocks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

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Christoph Hellwig 2016-09-19 11:26:39 +10:00 • committed by Dave Chinner

parent 17879e8f86

commit 66642c5c1d

1 changed files with 6 additions and 4 deletions

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fs/xfs/xfs_iomap.c

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