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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-02-23 11:31:51 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-03-02 08:43:39 -0500 |
| commit | f648022faa68ef76058aa121d1aa3a967d59cae8 (patch) | |
| tree | 45c9e48027420cf9be617e967b178b06a3d40160 /fs/nfs/Kconfig | |
| parent | 9332cf14e2db4253bec827da66bd95e6c0f6a2f3 (diff) | |
| download | lwn-f648022faa68ef76058aa121d1aa3a967d59cae8.tar.gz lwn-f648022faa68ef76058aa121d1aa3a967d59cae8.zip | |
NFS: Convert readdir page cache to use a cookie based index
Instead of using a linear index to address the pages, use the cookie of
the first entry, since that is what we use to match the page anyway.
This allows us to avoid re-reading the entire cache on a seekdir() type
of operation. The latter is very common when re-exporting NFS, and is a
major performance drain.
The change does affect our duplicate cookie detection, since we can no
longer rely on the page index as a linear offset for detecting whether
we looped backwards. However since we no longer do a linear search
through all the pages on each call to nfs_readdir(), this is less of a
concern than it was previously.
The other downside is that invalidate_mapping_pages() no longer can use
the page index to avoid clearing pages that have been read. A subsequent
patch will restore the functionality this provides to the 'ls -l'
heuristic.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/Kconfig')
| -rw-r--r-- | fs/nfs/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig index 14a72224b657..47a53b3362b6 100644 --- a/fs/nfs/Kconfig +++ b/fs/nfs/Kconfig @@ -4,6 +4,10 @@ config NFS_FS depends on INET && FILE_LOCKING && MULTIUSER select LOCKD select SUNRPC + select CRYPTO + select CRYPTO_HASH + select XXHASH + select CRYPTO_XXHASH select NFS_ACL_SUPPORT if NFS_V3_ACL help Choose Y here if you want to access files residing on other |