ocfs2: Provide convenience function for ino lookup

A couple paths which needed to just match a parent dir + name pair to an
inode number were a bit messy because they had to deal with
ocfs2_find_files_on_disk() which returns a larger number of values. Provide
a convenience function, ocfs2_lookup_ino_from_name() which internalizes all
the extra accounting.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Reviewed-by: Joel Becker <joel.becker@oracle.com>
diff --git a/fs/ocfs2/sysfile.c b/fs/ocfs2/sysfile.c
index 5df6e35..fd2e846 100644
--- a/fs/ocfs2/sysfile.c
+++ b/fs/ocfs2/sysfile.c
@@ -100,17 +100,14 @@
 	char namebuf[40];
 	struct inode *inode = NULL;
 	u64 blkno;
-	struct buffer_head *dirent_bh = NULL;
-	struct ocfs2_dir_entry *de = NULL;
 	int status = 0;
 
 	ocfs2_sprintf_system_inode_name(namebuf,
 					sizeof(namebuf),
 					type, slot);
 
-	status = ocfs2_find_files_on_disk(namebuf, strlen(namebuf),
-					  &blkno, osb->sys_root_inode,
-					  &dirent_bh, &de);
+	status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
+					    strlen(namebuf), &blkno);
 	if (status < 0) {
 		goto bail;
 	}
@@ -122,8 +119,7 @@
 		goto bail;
 	}
 bail:
-	if (dirent_bh)
-		brelse(dirent_bh);
+
 	return inode;
 }