From: Chuck Lever <cel@netapp.com>
Date: Tue, 25 Oct 2005 15:48:36 +0000 (-0400)
Subject: NFS: nfs_lookup doesn't need to revalidate the parent directory's inode
X-Git-Tag: v2.6.15-rc1~733^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0c70b50150cfb0b43ff500a8a394a52b4d5f1350;p=pandora-kernel.git

NFS: nfs_lookup doesn't need to revalidate the parent directory's inode

 nfs_lookup() used to consult a lookup cache before trying an actual wire
 lookup operation.  The lookup cache would be invalid, of course, if the
 parent directory's mtime had changed, so nfs_lookup performed an inode
 revalidation on the parent.

 Since nfs_lookup() doesn't use a cache anymore, the revalidation is no
 longer necessary.  There are cases where it will generate a lot of
 unnecessary GETATTR traffic.

 See http://bugzilla.linux-nfs.org/show_bug.cgi?id=9

 Test-plan:
 Use lndir and "rm -rf" and watch for excess GETATTR traffic or application
 level errors.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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