[PATCH RFC 22/24] nfs: skip dentry revalidation when parent dir has a delegation

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If the parent has a valid delegation, then test whether the
dentry->d_time matches the current change attr on the directory. If it
does, then we can declare the dentry valid with no further checks.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
 fs/nfs/dir.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index ac505671efbd..061648c73116 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2188,6 +2188,15 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
+static int
+nfs_lookup_revalidate_delegated_parent(struct inode *dir, struct dentry *dentry,
+				       struct inode *inode)
+	return nfs_lookup_revalidate_done(dir, dentry, inode,
+					  nfs_verify_change_attribute(dir, dentry->d_time) ?
+					  1 : 0);
 static int
 nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry,
 			  unsigned int flags)
@@ -2212,6 +2221,9 @@ nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry,
 	if (nfs_verifier_is_delegated(dentry))
 		return nfs_lookup_revalidate_delegated(dir, dentry, inode);
+	if (nfs_have_delegated_attributes(dir))
+		return nfs_lookup_revalidate_delegated_parent(dir, dentry, inode);
 	/* NFS only supports OPEN on regular files */
 	if (!S_ISREG(inode->i_mode))
 		goto full_reval;


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