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authorTrond Myklebust <trond.myklebust@hammerspace.com>2022-02-23 19:31:51 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2022-03-02 16:43:39 +0300
commitf648022faa68ef76058aa121d1aa3a967d59cae8 (patch)
tree45c9e48027420cf9be617e967b178b06a3d40160 /fs/nfs/Kconfig
parent9332cf14e2db4253bec827da66bd95e6c0f6a2f3 (diff)
downloadlinux-f648022faa68ef76058aa121d1aa3a967d59cae8.tar.xz
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/Kconfig4
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
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