rename user_path_umountat() to user_path_mountpoint_at()

... and move the extern from linux/namei.h to fs/internal.h,
along with that of vfs_path_lookup().

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

fs/internal.h

@@ -45,6 +45,9 @@ extern void __init chrdev_init(void);
  * namei.c
  */
 extern int __inode_permission(struct inode *, int);
+extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
+extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
+			   const char *, unsigned int, struct path *);
 
 /*
  * namespace.c

fs/namei.c

@@ -2223,7 +2223,7 @@ user_path_parent(int dfd, const char __user *path, struct nameidata *nd,
 }
 
 /**
- * umount_lookup_last - look up last component for umount
+ * mountpoint_last - look up last component for umount
  * @nd:   pathwalk nameidata - currently pointing at parent directory of "last"
  * @path: pointer to container for result
  *
@@ -2250,7 +2250,7 @@ user_path_parent(int dfd, const char __user *path, struct nameidata *nd,
  *         to the link, and nd->path will *not* be put.
  */
 static int
-umount_lookup_last(struct nameidata *nd, struct path *path)
+mountpoint_last(struct nameidata *nd, struct path *path)
 {
 	int error = 0;
 	struct dentry *dentry;
@@ -2312,17 +2312,16 @@ out:
 }
 
 /**
- * path_umountat - look up a path to be umounted
+ * path_mountpoint - look up a path to be umounted
  * @dfd:	directory file descriptor to start walk from
  * @name:	full pathname to walk
  * @flags:	lookup flags
- * @nd:		pathwalk nameidata
  *
  * Look up the given name, but don't attempt to revalidate the last component.
  * Returns 0 and "path" will be valid on success; Retuns error otherwise.
  */
 static int
-path_umountat(int dfd, const char *name, struct path *path, unsigned int flags)
+path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags)
 {
 	struct file *base = NULL;
 	struct nameidata nd;
@@ -2337,7 +2336,7 @@ path_umountat(int dfd, const char *name, struct path *path, unsigned int flags)
 	if (err)
 		goto out;
 
-	err = umount_lookup_last(&nd, path);
+	err = mountpoint_last(&nd, path);
 	while (err > 0) {
 		void *cookie;
 		struct path link = *path;
@@ -2348,7 +2347,7 @@ path_umountat(int dfd, const char *name, struct path *path, unsigned int flags)
 		err = follow_link(&link, &nd, &cookie);
 		if (err)
 			break;
-		err = umount_lookup_last(&nd, path);
+		err = mountpoint_last(&nd, path);
 		put_link(&nd, &link, cookie);
 	}
 out:
@@ -2362,7 +2361,7 @@ out:
 }
 
 /**
- * user_path_umountat - lookup a path from userland in order to umount it
+ * user_path_mountpoint_at - lookup a path from userland in order to umount it
  * @dfd:	directory file descriptor
  * @name:	pathname from userland
  * @flags:	lookup flags
@@ -2376,7 +2375,7 @@ out:
  * Returns 0 and populates "path" on success.
  */
 int
-user_path_umountat(int dfd, const char __user *name, unsigned int flags,
+user_path_mountpoint_at(int dfd, const char __user *name, unsigned int flags,
 			struct path *path)
 {
 	struct filename *s = getname(name);
@@ -2385,11 +2384,11 @@ user_path_umountat(int dfd, const char __user *name, unsigned int flags,
 	if (IS_ERR(s))
 		return PTR_ERR(s);
 
-	error = path_umountat(dfd, s->name, path, flags | LOOKUP_RCU);
+	error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_RCU);
 	if (unlikely(error == -ECHILD))
-		error = path_umountat(dfd, s->name, path, flags);
+		error = path_mountpoint(dfd, s->name, path, flags);
 	if (unlikely(error == -ESTALE))
-		error = path_umountat(dfd, s->name, path, flags | LOOKUP_REVAL);
+		error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_REVAL);
 
 	if (likely(!error))
 		audit_inode(s, path->dentry, 0);

fs/namespace.c

@@ -1321,7 +1321,7 @@ SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
 	if (!(flags & UMOUNT_NOFOLLOW))
 		lookup_flags |= LOOKUP_FOLLOW;
 
-	retval = user_path_umountat(AT_FDCWD, name, lookup_flags, &path);
+	retval = user_path_mountpoint_at(AT_FDCWD, name, lookup_flags, &path);
 	if (retval)
 		goto out;
 	mnt = real_mount(path.mnt);

include/linux/namei.h

@@ -58,7 +58,6 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
 
 extern int user_path_at(int, const char __user *, unsigned, struct path *);
 extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
-extern int user_path_umountat(int, const char __user *, unsigned int, struct path *);
 
 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
@@ -71,8 +70,6 @@ extern struct dentry *kern_path_create(int, const char *, struct path *, unsigne
 extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
 extern void done_path_create(struct path *, struct dentry *);
 extern struct dentry *kern_path_locked(const char *, struct path *);
-extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
-			   const char *, unsigned int, struct path *);
 
 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);