xfs: use a lockref for the buffer reference count

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The lockref structure allows incrementing/decrementing counters like
an atomic_t for the fast path, while still allowing complex slow path
operations as if the counter was protected by a lock.  The only slow
path operations that actually need to take the lock are the final
put, LRU evictions and marking a buffer stale.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

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Christoph Hellwig 2026-03-23 08:50:52 +01:00 • committed by Carlos Maiolino

parent 67fe430397

commit d02ee47bbe

3 changed files with 39 additions and 55 deletions

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80

fs/xfs/xfs_buf.c

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4

fs/xfs/xfs_buf.h

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10

fs/xfs/xfs_trace.h

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