diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
index 81fc002..ba8bf8d 100644
--- a/fs/reiserfs/ioctl.c
+++ b/fs/reiserfs/ioctl.c
@@ -120,7 +120,7 @@
 	/* we need to make sure nobody is changing the file size beneath
 	 ** us
 	 */
-	down(&inode->i_sem);
+	mutex_lock(&inode->i_mutex);
 
 	write_from = inode->i_size & (blocksize - 1);
 	/* if we are on a block boundary, we are already unpacked.  */
@@ -156,7 +156,7 @@
 	page_cache_release(page);
 
       out:
-	up(&inode->i_sem);
+	mutex_unlock(&inode->i_mutex);
 	reiserfs_write_unlock(inode->i_sb);
 	return retval;
 }