logfs: constify logfs_block_ops structures

The logfs_block_ops structures are never modified, so declare them as
const.

Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/logfs/logfs.h

@@ -302,7 +302,7 @@ struct logfs_block {
 	struct inode *inode;
 	struct logfs_transaction *ta;
 	unsigned long alias_map[LOGFS_BLOCK_FACTOR / BITS_PER_LONG];
-	struct logfs_block_ops *ops;
+	const struct logfs_block_ops *ops;
 	int full;
 	int partial;
 	int reserved_bytes;
@@ -579,7 +579,7 @@ int logfs_exist_block(struct inode *inode, u64 bix);
 int get_page_reserve(struct inode *inode, struct page *page);
 void logfs_get_wblocks(struct super_block *sb, struct page *page, int lock);
 void logfs_put_wblocks(struct super_block *sb, struct page *page, int lock);
-extern struct logfs_block_ops indirect_block_ops;
+extern const struct logfs_block_ops indirect_block_ops;
 
 /* segment.c */
 int logfs_erase_segment(struct super_block *sb, u32 ofs, int ensure_erase);

fs/logfs/readwrite.c

@@ -569,13 +569,13 @@ static void indirect_free_block(struct super_block *sb,
 }
 
 
-static struct logfs_block_ops inode_block_ops = {
+static const struct logfs_block_ops inode_block_ops = {
 	.write_block = inode_write_block,
 	.free_block = inode_free_block,
 	.write_alias = inode_write_alias,
 };
 
-struct logfs_block_ops indirect_block_ops = {
+const struct logfs_block_ops indirect_block_ops = {
 	.write_block = indirect_write_block,
 	.free_block = indirect_free_block,
 	.write_alias = indirect_write_alias,

fs/logfs/segment.c

@@ -197,7 +197,7 @@ static int btree_write_alias(struct super_block *sb, struct logfs_block *block,
 	return 0;
 }
 
-static struct logfs_block_ops btree_block_ops = {
+static const struct logfs_block_ops btree_block_ops = {
 	.write_block	= btree_write_block,
 	.free_block	= __free_block,
 	.write_alias	= btree_write_alias,