Trim excessive arguments of follow_mount_rcu()

... and kill a useless local variable in follow_dotdot_rcu(), while
we are at it - follow_mount_rcu(nd, path, inode) *always* assigned
value to *inode, and always it had been path->dentry->d_inode (aka
nd->path.dentry->d_inode, since it always got &nd->path as the second
argument).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index da9c265..9880814 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -951,29 +951,21 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
        return true;
 }
 
-static void follow_mount_rcu(struct nameidata *nd, struct path *path,
-                              struct inode **inode)
+static void follow_mount_rcu(struct nameidata *nd)
 {
-       for (;;) {
+       while (d_mountpoint(nd->path.dentry)) {
                struct vfsmount *mounted;
-               *inode = path->dentry->d_inode;
-
-               if (!d_mountpoint(path->dentry))
-                       break;
-
-               mounted = __lookup_mnt(path->mnt, path->dentry, 1);
+               mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry, 1);
                if (!mounted)
                        break;
-               path->mnt = mounted;
-               path->dentry = mounted->mnt_root;
-               nd->seq = read_seqcount_begin(&path->dentry->d_seq);
+               nd->path.mnt = mounted;
+               nd->path.dentry = mounted->mnt_root;
+               nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
        }
 }
 
 static int follow_dotdot_rcu(struct nameidata *nd)
 {
-       struct inode *inode = nd->inode;
-
        set_root_rcu(nd);
 
        while (1) {
@@ -989,7 +981,6 @@ static int follow_dotdot_rcu(struct nameidata *nd)
                        seq = read_seqcount_begin(&parent->d_seq);
                        if (read_seqcount_retry(&old->d_seq, nd->seq))
                                goto failed;
-                       inode = parent->d_inode;
                        nd->path.dentry = parent;
                        nd->seq = seq;
                        break;
@@ -997,10 +988,9 @@ static int follow_dotdot_rcu(struct nameidata *nd)
                if (!follow_up_rcu(&nd->path))
                        break;
                nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
-               inode = nd->path.dentry->d_inode;
        }
-       follow_mount_rcu(nd, &nd->path, &inode);
-       nd->inode = inode;
+       follow_mount_rcu(nd);
+       nd->inode = nd->path.dentry->d_inode;
        return 0;
 
 failed: