NFS: add a separate delegation return list

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Searching for returnable delegations in the per-server delegations list
can be very expensive.  While commit e04bbf6b1b ("NFS: Avoid quadratic
search when freeing delegations.") reduced the overhead a bit, the
fact that all the non-returnable delegations have to be searched limits
the amount of optimizations that can be done.

Fix this by introducing a separate list that only contains delegations
scheduled for return.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>

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This commit is contained in:

Christoph Hellwig 2026-01-07 08:27:13 +01:00 • committed by Anna Schumaker

parent 85e0563328

commit 0ebe655bd0

5 changed files with 85 additions and 87 deletions

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2

fs/nfs/client.c

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174

fs/nfs/delegation.c

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2

fs/nfs/delegation.h

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1

fs/nfs/nfs4trace.h

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7

include/linux/nfs_fs_sb.h

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