const: constify remaining file_operations

[akpm@linux-foundation.org: fix KVM]
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index 4845fbb..399487c 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -322,7 +322,7 @@
 	return generic_block_bmap(mapping, block, omfs_get_block);
 }
 
-struct file_operations omfs_file_operations = {
+const struct file_operations omfs_file_operations = {
 	.llseek = generic_file_llseek,
 	.read = do_sync_read,
 	.write = do_sync_write,