NFSv3: Add emulation of the lookupp() operation

In order to use the open_by_filehandle() operations on NFSv3, we need
to be able to emulate lookupp() so that nfs_get_parent() can be used
to convert disconnected dentries into connected ones.

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

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index acbdf7496d312fe5a95d7d23a485d96ac6437148..6b66b73a50ebbde562859038a92b30bd50c817e5 100644 (file)
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -209,6 +209,20 @@ nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
                                  task_flags);
 }
 
+static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
+                            struct nfs_fattr *fattr, struct nfs4_label *label)
+{
+       const char dotdot[] = "..";
+       const size_t len = strlen(dotdot);
+       unsigned short task_flags = 0;
+
+       if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
+               task_flags |= RPC_TASK_TIMEOUT;
+
+       return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
+                                 task_flags);
+}
+
 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 {
        struct nfs3_accessargs  arg = {
@@ -1015,6 +1029,7 @@ const struct nfs_rpc_ops nfs_v3_clientops = {
        .getattr        = nfs3_proc_getattr,
        .setattr        = nfs3_proc_setattr,
        .lookup         = nfs3_proc_lookup,
+       .lookupp        = nfs3_proc_lookupp,
        .access         = nfs3_proc_access,
        .readlink       = nfs3_proc_readlink,
        .create         = nfs3_proc_create,