fs/namespace.c: path_is_under can be boolean

This patch makes path_is_under return bool to improve
readability due to this particular function only using either
one or zero as its return value.

No functional change.
Signed-off-by: NYaowei Bai <baiyaowei@cmss.chinamobile.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/namespace.c

@@ -2939,9 +2939,9 @@ bool is_path_reachable(struct mount *mnt, struct dentry *dentry,
 	return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry);
 }
 
-int path_is_under(struct path *path1, struct path *path2)
+bool path_is_under(struct path *path1, struct path *path2)
 {
-	int res;
+	bool res;
 	read_seqlock_excl(&mount_lock);
 	res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);
 	read_sequnlock_excl(&mount_lock);

include/linux/fs.h

@@ -2533,7 +2533,7 @@ extern struct file * open_exec(const char *);
  
 /* fs/dcache.c -- generic fs support functions */
 extern int is_subdir(struct dentry *, struct dentry *);
-extern int path_is_under(struct path *, struct path *);
+extern bool path_is_under(struct path *, struct path *);
 
 extern char *file_path(struct file *, char *, int);