udf: kill useless file header comments for vfs method implementations

There's not need to document vfs method invocation rules, we have
Documentation/filesystems/vfs.txt and Documentation/filesystems/Locking
for that.  Also a lot of these comments where either plain wrong or
horrible out of date.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 24cfa55..dc2f946 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -66,22 +66,7 @@
 			       struct extent_position *);
 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
 
-/*
- * udf_delete_inode
- *
- * PURPOSE
- *	Clean-up before the specified inode is destroyed.
- *
- * DESCRIPTION
- *	This routine is called when the kernel destroys an inode structure
- *	ie. when iput() finds i_count == 0.
- *
- * HISTORY
- *	July 1, 1997 - Andrew E. Mileski
- *	Written, tested, and released.
- *
- *  Called at the last iput() if i_nlink is zero.
- */
+
 void udf_delete_inode(struct inode *inode)
 {
 	truncate_inode_pages(&inode->i_data, 0);
@@ -1416,21 +1401,6 @@
 	return mode;
 }
 
-/*
- * udf_write_inode
- *
- * PURPOSE
- *	Write out the specified inode.
- *
- * DESCRIPTION
- *	This routine is called whenever an inode is synced.
- *	Currently this routine is just a placeholder.
- *
- * HISTORY
- *	July 1, 1997 - Andrew E. Mileski
- *	Written, tested, and released.
- */
-
 int udf_write_inode(struct inode *inode, int sync)
 {
 	int ret;