ocfs2: don't open-code inode_lock/inode_unlock

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index ad15773..abb0b0b 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2311,7 +2311,7 @@
 	/* ocfs2_file_write_iter will get i_mutex, so we need not lock if we
 	 * are in that context. */
 	if (dwc->dw_writer_pid != task_pid_nr(current)) {
-		mutex_lock(&inode->i_mutex);
+		inode_lock(inode);
 		locked = 1;
 	}
 
@@ -2390,7 +2390,7 @@
 		ocfs2_free_alloc_context(meta_ac);
 	ocfs2_run_deallocs(osb, &dealloc);
 	if (locked)
-		mutex_unlock(&inode->i_mutex);
+		inode_unlock(inode);
 	ocfs2_dio_free_write_ctx(inode, dwc);
 }