xfs: remove a superflous hash lookup when inserting new buffers

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Currently on the slow path insert we repeat the initial hash table
lookup before we attempt the insert, resulting in a two traversals
of the hash table to ensure the insert is valid. The rhashtable API
provides a method for an atomic lookup and insert operation, so we
can avoid one of the hash table traversals by using this method.

Adapted from a large patch containing this optimisation by Christoph
Hellwig.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

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Dave Chinner 2022-07-14 12:04:43 +10:00 • committed by Dave Chinner

parent d8d9bbb0ee

commit 32dd4f9c50

1 changed files with 9 additions and 4 deletions

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fs/xfs/xfs_buf.c

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