lose 'mounting_here' argument in ->d_manage()

it's always false...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Documentation/filesystems/vfs.txt

@@ -873,7 +873,7 @@ struct dentry_operations {
 	void (*d_iput)(struct dentry *, struct inode *);
 	char *(*d_dname)(struct dentry *, char *, int);
 	struct vfsmount *(*d_automount)(struct path *);
-	int (*d_manage)(struct dentry *, bool, bool);
+	int (*d_manage)(struct dentry *, bool);
 };
 
   d_revalidate: called when the VFS needs to revalidate a dentry. This
@@ -969,10 +969,6 @@ struct dentry_operations {
 	mounted on it and not to check the automount flag.  Any other error
 	code will abort pathwalk completely.
 
-	If the 'mounting_here' parameter is true, then namespace_sem is being
-	held by the caller and the function should not initiate any mounts or
-	unmounts that it will then wait for.
-
 	If the 'rcu_walk' parameter is true, then the caller is doing a
 	pathwalk in RCU-walk mode.  Sleeping is not permitted in this mode,
 	and the caller can be asked to leave it and call again by returing

fs/autofs4/root.c

@@ -36,7 +36,7 @@ static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long);
 static int autofs4_dir_open(struct inode *inode, struct file *file);
 static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
 static struct vfsmount *autofs4_d_automount(struct path *);
-static int autofs4_d_manage(struct dentry *, bool, bool);
+static int autofs4_d_manage(struct dentry *, bool);
 static void autofs4_dentry_release(struct dentry *);
 
 const struct file_operations autofs4_root_operations = {
@@ -446,7 +446,7 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
 	return NULL;
 }
 
-int autofs4_d_manage(struct dentry *dentry, bool mounting_here, bool rcu_walk)
+int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
 {
 	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
 
@@ -454,7 +454,7 @@ int autofs4_d_manage(struct dentry *dentry, bool mounting_here, bool rcu_walk)
 		dentry, dentry->d_name.len, dentry->d_name.name);
 
 	/* The daemon never waits. */
-	if (autofs4_oz_mode(sbi) || mounting_here) {
+	if (autofs4_oz_mode(sbi)) {
 		if (!d_mountpoint(dentry))
 			return -EISDIR;
 		return 0;

fs/namei.c

@@ -933,8 +933,7 @@ static int follow_managed(struct path *path, unsigned flags)
 		if (managed & DCACHE_MANAGE_TRANSIT) {
 			BUG_ON(!path->dentry->d_op);
 			BUG_ON(!path->dentry->d_op->d_manage);
-			ret = path->dentry->d_op->d_manage(path->dentry,
-							   false, false);
+			ret = path->dentry->d_op->d_manage(path->dentry, false);
 			if (ret < 0)
 				return ret == -EISDIR ? 0 : ret;
 		}
@@ -999,7 +998,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
 		struct vfsmount *mounted;
 		if (unlikely(path->dentry->d_flags & DCACHE_MANAGE_TRANSIT) &&
 		    !reverse_transit &&
-		    path->dentry->d_op->d_manage(path->dentry, false, true) < 0)
+		    path->dentry->d_op->d_manage(path->dentry, true) < 0)
 			return false;
 		mounted = __lookup_mnt(path->mnt, path->dentry, 1);
 		if (!mounted)
@@ -1086,7 +1085,7 @@ int follow_down(struct path *path)
 			BUG_ON(!path->dentry->d_op);
 			BUG_ON(!path->dentry->d_op->d_manage);
 			ret = path->dentry->d_op->d_manage(
-				path->dentry, false, false);
+				path->dentry, false);
 			if (ret < 0)
 				return ret == -EISDIR ? 0 : ret;
 		}

include/linux/dcache.h

@@ -168,7 +168,7 @@ struct dentry_operations {
 	void (*d_iput)(struct dentry *, struct inode *);
 	char *(*d_dname)(struct dentry *, char *, int);
 	struct vfsmount *(*d_automount)(struct path *);
-	int (*d_manage)(struct dentry *, bool, bool);
+	int (*d_manage)(struct dentry *, bool);
 } ____cacheline_aligned;
 
 /*