fs/sysv: Use dir_put_page() in sysv_rename()

Use the dir_put_page() helper in sysv_rename() instead of open-coding two
kunmap() + put_page().

Cc: Al Viro <viro@zeniv.linux.org.uk>
Suggested-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: xp4ns3

fs/sysv/dir.c

@@ -28,7 +28,7 @@ const struct file_operations sysv_dir_operations = {
 	.fsync		= generic_file_fsync,
 };
 
-static inline void dir_put_page(struct page *page)
+inline void dir_put_page(struct page *page)
 {
 	kunmap(page);
 	put_page(page);

fs/sysv/namei.c

@@ -250,13 +250,10 @@ static int sysv_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
 	return 0;
 
 out_dir:
-	if (dir_de) {
-		kunmap(dir_page);
-		put_page(dir_page);
-	}
+	if (dir_de)
+		dir_put_page(dir_page);
 out_old:
-	kunmap(old_page);
-	put_page(old_page);
+	dir_put_page(old_page);
 out:
 	return err;
 }

fs/sysv/sysv.h

@@ -148,6 +148,7 @@ extern void sysv_destroy_icache(void);
 
 
 /* dir.c */
+extern void dir_put_page(struct page *page);
 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
 extern int sysv_add_link(struct dentry *, struct inode *);
 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);