[PATCH] mark address_space_operations const

Same as with already do with the file operations: keep them in .rodata and
prevents people from doing runtime patching.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Steven French <sfrench@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 04af9c4..fb4d322 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -684,7 +684,7 @@
 	return mpage_writepages(mapping, wbc, ext2_get_block);
 }
 
-struct address_space_operations ext2_aops = {
+const struct address_space_operations ext2_aops = {
 	.readpage		= ext2_readpage,
 	.readpages		= ext2_readpages,
 	.writepage		= ext2_writepage,
@@ -697,12 +697,12 @@
 	.migratepage		= buffer_migrate_page,
 };
 
-struct address_space_operations ext2_aops_xip = {
+const struct address_space_operations ext2_aops_xip = {
 	.bmap			= ext2_bmap,
 	.get_xip_page		= ext2_get_xip_page,
 };
 
-struct address_space_operations ext2_nobh_aops = {
+const struct address_space_operations ext2_nobh_aops = {
 	.readpage		= ext2_readpage,
 	.readpages		= ext2_readpages,
 	.writepage		= ext2_nobh_writepage,