xfs: introduce xfs_rw_lock() helpers for locking the inode

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We need to obtain the i_mutex, i_iolock and i_ilock during the read
and write paths. Add a set of wrapper functions to neatly
encapsulate the lock ordering and shared/exclusive semantics to make
the locking easier to follow and get right.

Note that this changes some of the exclusive locking serialisation in
that serialisation will occur against the i_mutex instead of the
XFS_IOLOCK_EXCL. This does not change any behaviour, and it is
arguably more efficient to use the mutex for such serialisation than
the rw_sem.

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

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Dave Chinner 2011-01-12 11:37:10 +11:00 • committed by Dave Chinner

parent 4c5cfd1b41

commit 487f84f3f8

1 changed files with 80 additions and 51 deletions

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fs/xfs/linux-2.6/xfs_file.c

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