NFS: Add softreval behaviour to nfs_lookup_revalidate()

If the server is unavaliable, we want to allow the revalidating
lookup to time out, and to default to validating the cached dentry
if the 'softreval' mount option is set.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 0451a094e89e..15c865cc837f 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -152,14 +152,14 @@ nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 }
 
 static int
-nfs_proc_lookup(struct inode *dir, const struct qstr *name,
+nfs_proc_lookup(struct inode *dir, struct dentry *dentry,
 		struct nfs_fh *fhandle, struct nfs_fattr *fattr,
 		struct nfs4_label *label)
 {
 	struct nfs_diropargs	arg = {
 		.fh		= NFS_FH(dir),
-		.name		= name->name,
-		.len		= name->len
+		.name		= dentry->d_name.name,
+		.len		= dentry->d_name.len
 	};
 	struct nfs_diropok	res = {
 		.fh		= fhandle,
@@ -171,10 +171,15 @@ nfs_proc_lookup(struct inode *dir, const struct qstr *name,
 		.rpc_resp	= &res,
 	};
 	int			status;
+	unsigned short task_flags = 0;
 
-	dprintk("NFS call  lookup %s\n", name->name);
+	/* Is this is an attribute revalidation, subject to softreval? */
+	if (nfs_lookup_is_soft_revalidate(dentry))
+		task_flags |= RPC_TASK_TIMEOUT;
+
+	dprintk("NFS call  lookup %pd2\n", dentry);
 	nfs_fattr_init(fattr);
-	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+	status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
 	dprintk("NFS reply lookup: %d\n", status);
 	return status;
 }