[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>

drivers/block/loop.c

@@ -210,7 +210,7 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
 {
 	struct file *file = lo->lo_backing_file; /* kudos to NFsckingS */
 	struct address_space *mapping = file->f_mapping;
-	struct address_space_operations *aops = mapping->a_ops;
+	const struct address_space_operations *aops = mapping->a_ops;
 	pgoff_t index;
 	unsigned offset, bv_offs;
 	int len, ret;
@@ -784,7 +784,7 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
 
 	error = -EINVAL;
 	if (S_ISREG(inode->i_mode) || S_ISBLK(inode->i_mode)) {
-		struct address_space_operations *aops = mapping->a_ops;
+		const struct address_space_operations *aops = mapping->a_ops;
 		/*
 		 * If we can't read - sorry. If we only can't write - well,
 		 * it's going to be read-only.

drivers/block/rd.c

@@ -191,7 +191,7 @@ static int ramdisk_set_page_dirty(struct page *page)
 	return 0;
 }
 
-static struct address_space_operations ramdisk_aops = {
+static const struct address_space_operations ramdisk_aops = {
 	.readpage	= ramdisk_readpage,
 	.prepare_write	= ramdisk_prepare_write,
 	.commit_write	= ramdisk_commit_write,

fs/9p/v9fs_vfs.h

@@ -38,7 +38,7 @@
  */
 
 extern struct file_system_type v9fs_fs_type;
-extern struct address_space_operations v9fs_addr_operations;
+extern const struct address_space_operations v9fs_addr_operations;
 extern const struct file_operations v9fs_file_operations;
 extern const struct file_operations v9fs_dir_operations;
 extern struct dentry_operations v9fs_dentry_operations;

fs/9p/vfs_addr.c

@@ -103,6 +103,6 @@ UnmapAndUnlock:
 	return retval;
 }
 
-struct address_space_operations v9fs_addr_operations = {
+const struct address_space_operations v9fs_addr_operations = {
       .readpage = v9fs_vfs_readpage,
 };

fs/adfs/inode.c

@@ -72,7 +72,7 @@ static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
 	return generic_block_bmap(mapping, block, adfs_get_block);
 }
 
-static struct address_space_operations adfs_aops = {
+static const struct address_space_operations adfs_aops = {
 	.readpage	= adfs_readpage,
 	.writepage	= adfs_writepage,
 	.sync_page	= block_sync_page,

fs/affs/affs.h

@@ -195,9 +195,9 @@ extern struct inode_operations   affs_symlink_inode_operations;
 extern const struct file_operations	 affs_file_operations;
 extern const struct file_operations	 affs_file_operations_ofs;
 extern const struct file_operations	 affs_dir_operations;
-extern struct address_space_operations	 affs_symlink_aops;
-extern struct address_space_operations	 affs_aops;
-extern struct address_space_operations	 affs_aops_ofs;
+extern const struct address_space_operations	 affs_symlink_aops;
+extern const struct address_space_operations	 affs_aops;
+extern const struct address_space_operations	 affs_aops_ofs;
 
 extern struct dentry_operations	 affs_dentry_operations;
 extern struct dentry_operations	 affs_dentry_operations_intl;

fs/affs/file.c

@@ -406,7 +406,7 @@ static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
 {
 	return generic_block_bmap(mapping,block,affs_get_block);
 }
-struct address_space_operations affs_aops = {
+const struct address_space_operations affs_aops = {
 	.readpage = affs_readpage,
 	.writepage = affs_writepage,
 	.sync_page = block_sync_page,
@@ -759,7 +759,7 @@ out:
 	goto done;
 }
 
-struct address_space_operations affs_aops_ofs = {
+const struct address_space_operations affs_aops_ofs = {
 	.readpage = affs_readpage_ofs,
 	//.writepage = affs_writepage_ofs,
 	//.sync_page = affs_sync_page_ofs,

fs/affs/symlink.c

@@ -66,7 +66,7 @@ fail:
 	return err;
 }
 
-struct address_space_operations affs_symlink_aops = {
+const struct address_space_operations affs_symlink_aops = {
 	.readpage	= affs_symlink_readpage,
 };
 

fs/afs/file.c

@@ -35,7 +35,7 @@ struct inode_operations afs_file_inode_operations = {
 	.getattr	= afs_inode_getattr,
 };
 
-struct address_space_operations afs_fs_aops = {
+const struct address_space_operations afs_fs_aops = {
 	.readpage	= afs_file_readpage,
 	.sync_page	= block_sync_page,
 	.set_page_dirty	= __set_page_dirty_nobuffers,

fs/afs/internal.h

@@ -69,7 +69,7 @@ extern const struct file_operations afs_dir_file_operations;
 /*
  * file.c
  */
-extern struct address_space_operations afs_fs_aops;
+extern const struct address_space_operations afs_fs_aops;
 extern struct inode_operations afs_file_inode_operations;
 
 #ifdef AFS_CACHING_SUPPORT

fs/befs/linuxvfs.c

@@ -73,7 +73,7 @@ static struct inode_operations befs_dir_inode_operations = {
 	.lookup		= befs_lookup,
 };
 
-static struct address_space_operations befs_aops = {
+static const struct address_space_operations befs_aops = {
 	.readpage	= befs_readpage,
 	.sync_page	= block_sync_page,
 	.bmap		= befs_bmap,

fs/bfs/bfs.h

@@ -50,7 +50,7 @@ static inline struct bfs_inode_info *BFS_I(struct inode *inode)
 /* file.c */
 extern struct inode_operations bfs_file_inops;
 extern const struct file_operations bfs_file_operations;
-extern struct address_space_operations bfs_aops;
+extern const struct address_space_operations bfs_aops;
 
 /* dir.c */
 extern struct inode_operations bfs_dir_inops;

fs/bfs/file.c

@@ -153,7 +153,7 @@ static sector_t bfs_bmap(struct address_space *mapping, sector_t block)
 	return generic_block_bmap(mapping, block, bfs_get_block);
 }
 
-struct address_space_operations bfs_aops = {
+const struct address_space_operations bfs_aops = {
 	.readpage	= bfs_readpage,
 	.writepage	= bfs_writepage,
 	.sync_page	= block_sync_page,

fs/block_dev.c

@@ -1095,7 +1095,7 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 	return blkdev_ioctl(file->f_mapping->host, file, cmd, arg);
 }
 
-struct address_space_operations def_blk_aops = {
+const struct address_space_operations def_blk_aops = {
 	.readpage	= blkdev_readpage,
 	.writepage	= blkdev_writepage,
 	.sync_page	= block_sync_page,

fs/buffer.c

@@ -2598,7 +2598,7 @@ int nobh_truncate_page(struct address_space *mapping, loff_t from)
 	unsigned offset = from & (PAGE_CACHE_SIZE-1);
 	unsigned to;
 	struct page *page;
-	struct address_space_operations *a_ops = mapping->a_ops;
+	const struct address_space_operations *a_ops = mapping->a_ops;
 	char *kaddr;
 	int ret = 0;
 

fs/cifs/cifsfs.h

@@ -32,8 +32,8 @@
 #define TRUE 1
 #endif
 
-extern struct address_space_operations cifs_addr_ops;
-extern struct address_space_operations cifs_addr_ops_smallbuf;
+extern const struct address_space_operations cifs_addr_ops;
+extern const struct address_space_operations cifs_addr_ops_smallbuf;
 
 /* Functions related to super block operations */
 extern struct super_operations cifs_super_ops;

fs/cifs/file.c

@@ -1942,7 +1942,7 @@ static int cifs_prepare_write(struct file *file, struct page *page,
 	return 0;
 }
 
-struct address_space_operations cifs_addr_ops = {
+const struct address_space_operations cifs_addr_ops = {
 	.readpage = cifs_readpage,
 	.readpages = cifs_readpages,
 	.writepage = cifs_writepage,
@@ -1959,7 +1959,7 @@ struct address_space_operations cifs_addr_ops = {
  * contain the header plus one complete page of data.  Otherwise, we need
  * to leave cifs_readpages out of the address space operations.
  */
-struct address_space_operations cifs_addr_ops_smallbuf = {
+const struct address_space_operations cifs_addr_ops_smallbuf = {
 	.readpage = cifs_readpage,
 	.writepage = cifs_writepage,
 	.writepages = cifs_writepages,

fs/coda/symlink.c

@@ -50,6 +50,6 @@ fail:
 	return error;
 }
 
-struct address_space_operations coda_symlink_aops = {
+const struct address_space_operations coda_symlink_aops = {
 	.readpage	= coda_symlink_filler,
 };

fs/configfs/inode.c

@@ -38,7 +38,7 @@
 
 extern struct super_block * configfs_sb;
 
-static struct address_space_operations configfs_aops = {
+static const struct address_space_operations configfs_aops = {
 	.readpage	= simple_readpage,
 	.prepare_write	= simple_prepare_write,
 	.commit_write	= simple_commit_write

fs/cramfs/inode.c

@@ -30,7 +30,7 @@
 static struct super_operations cramfs_ops;
 static struct inode_operations cramfs_dir_inode_operations;
 static const struct file_operations cramfs_directory_operations;
-static struct address_space_operations cramfs_aops;
+static const struct address_space_operations cramfs_aops;
 
 static DEFINE_MUTEX(read_mutex);
 
@@ -501,7 +501,7 @@ static int cramfs_readpage(struct file *file, struct page * page)
 	return 0;
 }
 
-static struct address_space_operations cramfs_aops = {
+static const struct address_space_operations cramfs_aops = {
 	.readpage = cramfs_readpage
 };