fs: remove prepare_write/commit_write

Nothing uses prepare_write or commit_write. Remove them from the tree
completely.

[akpm@linux-foundation.org: schedule simple_prepare_write() for unexporting]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/splice.c b/fs/splice.c
index a1e701c..1abab5c 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -731,8 +731,8 @@
 	};
 
 	/*
-	 * The actor worker might be calling ->prepare_write and
-	 * ->commit_write. Most of the time, these expect i_mutex to
+	 * The actor worker might be calling ->write_begin and
+	 * ->write_end. Most of the time, these expect i_mutex to
 	 * be held. Since this may result in an ABBA deadlock with
 	 * pipe->inode, we have to order lock acquiry here.
 	 */