Re: [PATCH] mark address_space_operations const

[Prasanna S Panchamukhi <prasanna@in.ibm.com>]

On Wed, May 03, 2006 at 03:18:36PM +0200, Christoph Hellwig wrote:
> Same as with already do with the file operations:
> keep them in .rodata and prevents people from doing runtime patching.

I understand that making file operations .rodata was
to prevent binary driver authors overriding individual
file_operations members at runtime.

This patch prevents even GPL code from overriding address_space
operations. There might be in kernel users who want to override
address_space operations.

Thanks
Prasanna

> 
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> Index: linux-2.6/drivers/block/loop.c
> ===================================================================
> --- linux-2.6.orig/drivers/block/loop.c	2006-04-04 16:50:09.000000000 +0200
> +++ linux-2.6/drivers/block/loop.c	2006-05-03 15:01:57.000000000 +0200
> @@ -210,7 +210,7 @@
>  {
>  	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 @@
>  
>  	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.
> Index: linux-2.6/drivers/block/rd.c
> ===================================================================
> --- linux-2.6.orig/drivers/block/rd.c	2006-04-04 16:50:09.000000000 +0200
> +++ linux-2.6/drivers/block/rd.c	2006-05-03 15:02:04.000000000 +0200
> @@ -191,7 +191,7 @@
>  	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,
> Index: linux-2.6/fs/9p/v9fs_vfs.h
> ===================================================================
> --- linux-2.6.orig/fs/9p/v9fs_vfs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/9p/v9fs_vfs.h	2006-05-03 15:02:38.000000000 +0200
> @@ -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;
> Index: linux-2.6/fs/9p/vfs_addr.c
> ===================================================================
> --- linux-2.6.orig/fs/9p/vfs_addr.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/9p/vfs_addr.c	2006-05-03 15:02:43.000000000 +0200
> @@ -103,6 +103,6 @@
>  	return retval;
>  }
>  
> -struct address_space_operations v9fs_addr_operations = {
> +const struct address_space_operations v9fs_addr_operations = {
>        .readpage = v9fs_vfs_readpage,
>  };
> Index: linux-2.6/fs/adfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/adfs/inode.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/adfs/inode.c	2006-05-03 15:02:47.000000000 +0200
> @@ -72,7 +72,7 @@
>  	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,
> Index: linux-2.6/fs/affs/affs.h
> ===================================================================
> --- linux-2.6.orig/fs/affs/affs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/affs/affs.h	2006-05-03 15:02:53.000000000 +0200
> @@ -195,9 +195,9 @@
>  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;
> Index: linux-2.6/fs/affs/file.c
> ===================================================================
> --- linux-2.6.orig/fs/affs/file.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/affs/file.c	2006-05-03 15:02:58.000000000 +0200
> @@ -406,7 +406,7 @@
>  {
>  	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 @@
>  	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,
> Index: linux-2.6/fs/affs/symlink.c
> ===================================================================
> --- linux-2.6.orig/fs/affs/symlink.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/affs/symlink.c	2006-05-03 15:03:02.000000000 +0200
> @@ -66,7 +66,7 @@
>  	return err;
>  }
>  
> -struct address_space_operations affs_symlink_aops = {
> +const struct address_space_operations affs_symlink_aops = {
>  	.readpage	= affs_symlink_readpage,
>  };
>  
> Index: linux-2.6/fs/afs/file.c
> ===================================================================
> --- linux-2.6.orig/fs/afs/file.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/afs/file.c	2006-05-03 15:03:06.000000000 +0200
> @@ -35,7 +35,7 @@
>  	.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,
> Index: linux-2.6/fs/afs/internal.h
> ===================================================================
> --- linux-2.6.orig/fs/afs/internal.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/afs/internal.h	2006-05-03 15:03:10.000000000 +0200
> @@ -69,7 +69,7 @@
>  /*
>   * 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
> Index: linux-2.6/fs/befs/linuxvfs.c
> ===================================================================
> --- linux-2.6.orig/fs/befs/linuxvfs.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/befs/linuxvfs.c	2006-05-03 15:03:12.000000000 +0200
> @@ -73,7 +73,7 @@
>  	.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,
> Index: linux-2.6/fs/bfs/bfs.h
> ===================================================================
> --- linux-2.6.orig/fs/bfs/bfs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/bfs/bfs.h	2006-05-03 15:03:20.000000000 +0200
> @@ -50,7 +50,7 @@
>  /* 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;
> Index: linux-2.6/fs/bfs/file.c
> ===================================================================
> --- linux-2.6.orig/fs/bfs/file.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/bfs/file.c	2006-05-03 15:03:23.000000000 +0200
> @@ -153,7 +153,7 @@
>  	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,
> Index: linux-2.6/fs/block_dev.c
> ===================================================================
> --- linux-2.6.orig/fs/block_dev.c	2006-05-02 16:26:14.000000000 +0200
> +++ linux-2.6/fs/block_dev.c	2006-05-03 15:03:28.000000000 +0200
> @@ -1077,7 +1077,7 @@
>  	return blkdev_ioctl(file->f_mapping->host, file, cmd, arg);
>  }
>  
> -struct address_space_operations def_blk_aops = {
> +const const struct address_space_operations def_blk_aops = {
>  	.readpage	= blkdev_readpage,
>  	.writepage	= blkdev_writepage,
>  	.sync_page	= block_sync_page,
> Index: linux-2.6/fs/buffer.c
> ===================================================================
> --- linux-2.6.orig/fs/buffer.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/buffer.c	2006-05-03 15:03:32.000000000 +0200
> @@ -2600,7 +2600,7 @@
>  	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;
>  
> Index: linux-2.6/fs/cifs/cifsfs.h
> ===================================================================
> --- linux-2.6.orig/fs/cifs/cifsfs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/cifs/cifsfs.h	2006-05-03 15:03:35.000000000 +0200
> @@ -32,7 +32,7 @@
>  #define TRUE 1
>  #endif
>  
> -extern struct address_space_operations cifs_addr_ops;
> +extern const struct address_space_operations cifs_addr_ops;
>  
>  /* Functions related to super block operations */
>  extern struct super_operations cifs_super_ops;
> Index: linux-2.6/fs/cifs/file.c
> ===================================================================
> --- linux-2.6.orig/fs/cifs/file.c	2006-04-25 15:53:07.000000000 +0200
> +++ linux-2.6/fs/cifs/file.c	2006-05-03 15:03:38.000000000 +0200
> @@ -1944,7 +1944,7 @@
>  	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,
> Index: linux-2.6/fs/coda/symlink.c
> ===================================================================
> --- linux-2.6.orig/fs/coda/symlink.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/coda/symlink.c	2006-05-03 15:03:41.000000000 +0200
> @@ -50,6 +50,6 @@
>  	return error;
>  }
>  
> -struct address_space_operations coda_symlink_aops = {
> +const struct address_space_operations coda_symlink_aops = {
>  	.readpage	= coda_symlink_filler,
>  };
> Index: linux-2.6/fs/configfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/configfs/inode.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/configfs/inode.c	2006-05-03 15:03:44.000000000 +0200
> @@ -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
> Index: linux-2.6/fs/cramfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/cramfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/cramfs/inode.c	2006-05-03 15:03:47.000000000 +0200
> @@ -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 @@
>  	return 0;
>  }
>  
> -static struct address_space_operations cramfs_aops = {
> +static const struct address_space_operations cramfs_aops = {
>  	.readpage = cramfs_readpage
>  };
>  
> Index: linux-2.6/fs/efs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/efs/inode.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/efs/inode.c	2006-05-03 15:03:50.000000000 +0200
> @@ -21,7 +21,7 @@
>  {
>  	return generic_block_bmap(mapping,block,efs_get_block);
>  }
> -static struct address_space_operations efs_aops = {
> +static const struct address_space_operations efs_aops = {
>  	.readpage = efs_readpage,
>  	.sync_page = block_sync_page,
>  	.bmap = _efs_bmap
> Index: linux-2.6/fs/efs/symlink.c
> ===================================================================
> --- linux-2.6.orig/fs/efs/symlink.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/efs/symlink.c	2006-05-03 15:03:53.000000000 +0200
> @@ -53,6 +53,6 @@
>  	return err;
>  }
>  
> -struct address_space_operations efs_symlink_aops = {
> +const struct address_space_operations efs_symlink_aops = {
>  	.readpage	= efs_symlink_readpage
>  };
> Index: linux-2.6/fs/ext2/ext2.h
> ===================================================================
> --- linux-2.6.orig/fs/ext2/ext2.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ext2/ext2.h	2006-05-03 15:03:56.000000000 +0200
> @@ -162,9 +162,9 @@
>  extern const struct file_operations ext2_xip_file_operations;
>  
>  /* inode.c */
> -extern struct address_space_operations ext2_aops;
> -extern struct address_space_operations ext2_aops_xip;
> -extern struct address_space_operations ext2_nobh_aops;
> +extern const struct address_space_operations ext2_aops;
> +extern const struct address_space_operations ext2_aops_xip;
> +extern const struct address_space_operations ext2_nobh_aops;
>  
>  /* namei.c */
>  extern struct inode_operations ext2_dir_inode_operations;
> Index: linux-2.6/fs/ext2/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/ext2/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ext2/inode.c	2006-05-03 15:03:58.000000000 +0200
> @@ -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,
> Index: linux-2.6/fs/ext3/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/ext3/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ext3/inode.c	2006-05-03 15:04:01.000000000 +0200
> @@ -1696,7 +1696,7 @@
>  	return __set_page_dirty_nobuffers(page);
>  }
>  
> -static struct address_space_operations ext3_ordered_aops = {
> +static const struct address_space_operations ext3_ordered_aops = {
>  	.readpage	= ext3_readpage,
>  	.readpages	= ext3_readpages,
>  	.writepage	= ext3_ordered_writepage,
> @@ -1710,7 +1710,7 @@
>  	.migratepage	= buffer_migrate_page,
>  };
>  
> -static struct address_space_operations ext3_writeback_aops = {
> +static const struct address_space_operations ext3_writeback_aops = {
>  	.readpage	= ext3_readpage,
>  	.readpages	= ext3_readpages,
>  	.writepage	= ext3_writeback_writepage,
> @@ -1724,7 +1724,7 @@
>  	.migratepage	= buffer_migrate_page,
>  };
>  
> -static struct address_space_operations ext3_journalled_aops = {
> +static const struct address_space_operations ext3_journalled_aops = {
>  	.readpage	= ext3_readpage,
>  	.readpages	= ext3_readpages,
>  	.writepage	= ext3_journalled_writepage,
> Index: linux-2.6/fs/fat/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/fat/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/fat/inode.c	2006-05-03 15:04:03.000000000 +0200
> @@ -196,7 +196,7 @@
>  	return generic_block_bmap(mapping, block, fat_get_block);
>  }
>  
> -static struct address_space_operations fat_aops = {
> +static const struct address_space_operations fat_aops = {
>  	.readpage	= fat_readpage,
>  	.readpages	= fat_readpages,
>  	.writepage	= fat_writepage,
> Index: linux-2.6/fs/freevxfs/vxfs_immed.c
> ===================================================================
> --- linux-2.6.orig/fs/freevxfs/vxfs_immed.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/freevxfs/vxfs_immed.c	2006-05-03 15:04:06.000000000 +0200
> @@ -56,7 +56,7 @@
>  /*
>   * Adress space operations for immed files and directories.
>   */
> -struct address_space_operations vxfs_immed_aops = {
> +const struct address_space_operations vxfs_immed_aops = {
>  	.readpage =		vxfs_immed_readpage,
>  };
>  
> Index: linux-2.6/fs/freevxfs/vxfs_inode.c
> ===================================================================
> --- linux-2.6.orig/fs/freevxfs/vxfs_inode.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/freevxfs/vxfs_inode.c	2006-05-03 15:04:08.000000000 +0200
> @@ -41,8 +41,8 @@
>  #include "vxfs_extern.h"
>  
>  
> -extern struct address_space_operations vxfs_aops;
> -extern struct address_space_operations vxfs_immed_aops;
> +extern const struct address_space_operations vxfs_aops;
> +extern const struct address_space_operations vxfs_immed_aops;
>  
>  extern struct inode_operations vxfs_immed_symlink_iops;
>  
> @@ -295,7 +295,7 @@
>  {
>  	struct super_block		*sbp = ip->i_sb;
>  	struct vxfs_inode_info		*vip;
> -	struct address_space_operations	*aops;
> +	const struct address_space_operations	*aops;
>  	ino_t				ino = ip->i_ino;
>  
>  	if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist)))
> Index: linux-2.6/fs/freevxfs/vxfs_subr.c
> ===================================================================
> --- linux-2.6.orig/fs/freevxfs/vxfs_subr.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/freevxfs/vxfs_subr.c	2006-05-03 15:04:11.000000000 +0200
> @@ -42,7 +42,7 @@
>  static int		vxfs_readpage(struct file *, struct page *);
>  static sector_t		vxfs_bmap(struct address_space *, sector_t);
>  
> -struct address_space_operations vxfs_aops = {
> +const struct address_space_operations vxfs_aops = {
>  	.readpage =		vxfs_readpage,
>  	.bmap =			vxfs_bmap,
>  	.sync_page =		block_sync_page,
> Index: linux-2.6/fs/fuse/file.c
> ===================================================================
> --- linux-2.6.orig/fs/fuse/file.c	2006-04-25 15:53:07.000000000 +0200
> +++ linux-2.6/fs/fuse/file.c	2006-05-03 15:04:13.000000000 +0200
> @@ -642,7 +642,7 @@
>  	/* no mmap and sendfile */
>  };
>  
> -static struct address_space_operations fuse_file_aops  = {
> +static const struct address_space_operations fuse_file_aops  = {
>  	.readpage	= fuse_readpage,
>  	.prepare_write	= fuse_prepare_write,
>  	.commit_write	= fuse_commit_write,
> Index: linux-2.6/fs/hfs/hfs_fs.h
> ===================================================================
> --- linux-2.6.orig/fs/hfs/hfs_fs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hfs/hfs_fs.h	2006-05-03 15:04:16.000000000 +0200
> @@ -182,8 +182,8 @@
>  extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
>  
>  /* inode.c */
> -extern struct address_space_operations hfs_aops;
> -extern struct address_space_operations hfs_btree_aops;
> +extern const struct address_space_operations hfs_aops;
> +extern const struct address_space_operations hfs_btree_aops;
>  
>  extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
>  extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
> Index: linux-2.6/fs/hfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/hfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hfs/inode.c	2006-05-03 15:04:18.000000000 +0200
> @@ -114,7 +114,7 @@
>  	return mpage_writepages(mapping, wbc, hfs_get_block);
>  }
>  
> -struct address_space_operations hfs_btree_aops = {
> +const struct address_space_operations hfs_btree_aops = {
>  	.readpage	= hfs_readpage,
>  	.writepage	= hfs_writepage,
>  	.sync_page	= block_sync_page,
> @@ -124,7 +124,7 @@
>  	.releasepage	= hfs_releasepage,
>  };
>  
> -struct address_space_operations hfs_aops = {
> +const struct address_space_operations hfs_aops = {
>  	.readpage	= hfs_readpage,
>  	.writepage	= hfs_writepage,
>  	.sync_page	= block_sync_page,
> Index: linux-2.6/fs/hfsplus/hfsplus_fs.h
> ===================================================================
> --- linux-2.6.orig/fs/hfsplus/hfsplus_fs.h	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/hfsplus/hfsplus_fs.h	2006-05-03 15:04:21.000000000 +0200
> @@ -323,8 +323,8 @@
>  void hfsplus_file_truncate(struct inode *);
>  
>  /* inode.c */
> -extern struct address_space_operations hfsplus_aops;
> -extern struct address_space_operations hfsplus_btree_aops;
> +extern const struct address_space_operations hfsplus_aops;
> +extern const struct address_space_operations hfsplus_btree_aops;
>  
>  void hfsplus_inode_read_fork(struct inode *, struct hfsplus_fork_raw *);
>  void hfsplus_inode_write_fork(struct inode *, struct hfsplus_fork_raw *);
> Index: linux-2.6/fs/hfsplus/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/hfsplus/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hfsplus/inode.c	2006-05-03 15:04:23.000000000 +0200
> @@ -109,7 +109,7 @@
>  	return mpage_writepages(mapping, wbc, hfsplus_get_block);
>  }
>  
> -struct address_space_operations hfsplus_btree_aops = {
> +const struct address_space_operations hfsplus_btree_aops = {
>  	.readpage	= hfsplus_readpage,
>  	.writepage	= hfsplus_writepage,
>  	.sync_page	= block_sync_page,
> @@ -119,7 +119,7 @@
>  	.releasepage	= hfsplus_releasepage,
>  };
>  
> -struct address_space_operations hfsplus_aops = {
> +const struct address_space_operations hfsplus_aops = {
>  	.readpage	= hfsplus_readpage,
>  	.writepage	= hfsplus_writepage,
>  	.sync_page	= block_sync_page,
> Index: linux-2.6/fs/hostfs/hostfs_kern.c
> ===================================================================
> --- linux-2.6.orig/fs/hostfs/hostfs_kern.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hostfs/hostfs_kern.c	2006-05-03 15:04:26.000000000 +0200
> @@ -54,7 +54,7 @@
>  
>  static struct inode_operations hostfs_iops;
>  static struct inode_operations hostfs_dir_iops;
> -static struct address_space_operations hostfs_link_aops;
> +static const struct address_space_operations hostfs_link_aops;
>  
>  #ifndef MODULE
>  static int __init hostfs_args(char *options, int *add)
> @@ -518,7 +518,7 @@
>  	return(err);
>  }
>  
> -static struct address_space_operations hostfs_aops = {
> +static const struct address_space_operations hostfs_aops = {
>  	.writepage 	= hostfs_writepage,
>  	.readpage	= hostfs_readpage,
>  	.set_page_dirty = __set_page_dirty_nobuffers,
> @@ -935,7 +935,7 @@
>  	return(err);
>  }
>  
> -static struct address_space_operations hostfs_link_aops = {
> +static const struct address_space_operations hostfs_link_aops = {
>  	.readpage	= hostfs_link_readpage,
>  };
>  
> Index: linux-2.6/fs/hpfs/file.c
> ===================================================================
> --- linux-2.6.orig/fs/hpfs/file.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hpfs/file.c	2006-05-03 15:04:29.000000000 +0200
> @@ -99,7 +99,7 @@
>  {
>  	return generic_block_bmap(mapping,block,hpfs_get_block);
>  }
> -struct address_space_operations hpfs_aops = {
> +const struct address_space_operations hpfs_aops = {
>  	.readpage = hpfs_readpage,
>  	.writepage = hpfs_writepage,
>  	.sync_page = block_sync_page,
> Index: linux-2.6/fs/hpfs/hpfs_fn.h
> ===================================================================
> --- linux-2.6.orig/fs/hpfs/hpfs_fn.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hpfs/hpfs_fn.h	2006-05-03 15:04:31.000000000 +0200
> @@ -268,7 +268,7 @@
>  int hpfs_file_fsync(struct file *, struct dentry *, int);
>  extern const struct file_operations hpfs_file_ops;
>  extern struct inode_operations hpfs_file_iops;
> -extern struct address_space_operations hpfs_aops;
> +extern const struct address_space_operations hpfs_aops;
>  
>  /* inode.c */
>  
> @@ -304,7 +304,7 @@
>  /* namei.c */
>  
>  extern struct inode_operations hpfs_dir_iops;
> -extern struct address_space_operations hpfs_symlink_aops;
> +extern const struct address_space_operations hpfs_symlink_aops;
>  
>  static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
>  {
> Index: linux-2.6/fs/hpfs/namei.c
> ===================================================================
> --- linux-2.6.orig/fs/hpfs/namei.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hpfs/namei.c	2006-05-03 15:04:34.000000000 +0200
> @@ -538,7 +538,7 @@
>  	return err;
>  }
>  
> -struct address_space_operations hpfs_symlink_aops = {
> +const struct address_space_operations hpfs_symlink_aops = {
>  	.readpage	= hpfs_symlink_readpage
>  };
>  	
> Index: linux-2.6/fs/hugetlbfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/hugetlbfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/hugetlbfs/inode.c	2006-05-03 15:04:37.000000000 +0200
> @@ -34,7 +34,7 @@
>  #define HUGETLBFS_MAGIC	0x958458f6
>  
>  static struct super_operations hugetlbfs_ops;
> -static struct address_space_operations hugetlbfs_aops;
> +static const struct address_space_operations hugetlbfs_aops;
>  const struct file_operations hugetlbfs_file_operations;
>  static struct inode_operations hugetlbfs_dir_inode_operations;
>  static struct inode_operations hugetlbfs_inode_operations;
> @@ -549,7 +549,7 @@
>  	kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
>  }
>  
> -static struct address_space_operations hugetlbfs_aops = {
> +static const struct address_space_operations hugetlbfs_aops = {
>  	.readpage	= hugetlbfs_readpage,
>  	.prepare_write	= hugetlbfs_prepare_write,
>  	.commit_write	= hugetlbfs_commit_write,
> Index: linux-2.6/fs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/inode.c	2006-05-03 15:04:39.000000000 +0200
> @@ -102,7 +102,7 @@
>  
>  static struct inode *alloc_inode(struct super_block *sb)
>  {
> -	static struct address_space_operations empty_aops;
> +	static const struct address_space_operations empty_aops;
>  	static struct inode_operations empty_iops;
>  	static const struct file_operations empty_fops;
>  	struct inode *inode;
> Index: linux-2.6/fs/isofs/compress.c
> ===================================================================
> --- linux-2.6.orig/fs/isofs/compress.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/isofs/compress.c	2006-05-03 15:04:42.000000000 +0200
> @@ -312,7 +312,7 @@
>  	return err;
>  }
>  
> -struct address_space_operations zisofs_aops = {
> +const struct address_space_operations zisofs_aops = {
>  	.readpage = zisofs_readpage,
>  	/* No sync_page operation supported? */
>  	/* No bmap operation supported */
> Index: linux-2.6/fs/isofs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/isofs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/isofs/inode.c	2006-05-03 15:04:44.000000000 +0200
> @@ -1052,7 +1052,7 @@
>  	return generic_block_bmap(mapping,block,isofs_get_block);
>  }
>  
> -static struct address_space_operations isofs_aops = {
> +static const struct address_space_operations isofs_aops = {
>  	.readpage = isofs_readpage,
>  	.sync_page = block_sync_page,
>  	.bmap = _isofs_bmap
> Index: linux-2.6/fs/isofs/isofs.h
> ===================================================================
> --- linux-2.6.orig/fs/isofs/isofs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/isofs/isofs.h	2006-05-03 15:04:47.000000000 +0200
> @@ -176,5 +176,5 @@
>  
>  extern struct inode_operations isofs_dir_inode_operations;
>  extern const struct file_operations isofs_dir_operations;
> -extern struct address_space_operations isofs_symlink_aops;
> +extern const struct address_space_operations isofs_symlink_aops;
>  extern struct export_operations isofs_export_ops;
> Index: linux-2.6/fs/isofs/rock.c
> ===================================================================
> --- linux-2.6.orig/fs/isofs/rock.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/isofs/rock.c	2006-05-03 15:04:51.000000000 +0200
> @@ -754,6 +754,6 @@
>  	return -EIO;
>  }
>  
> -struct address_space_operations isofs_symlink_aops = {
> +const struct address_space_operations isofs_symlink_aops = {
>  	.readpage = rock_ridge_symlink_readpage
>  };
> Index: linux-2.6/fs/isofs/zisofs.h
> ===================================================================
> --- linux-2.6.orig/fs/isofs/zisofs.h	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/isofs/zisofs.h	2006-05-03 15:04:54.000000000 +0200
> @@ -15,7 +15,7 @@
>   */
>  
>  #ifdef CONFIG_ZISOFS
> -extern struct address_space_operations zisofs_aops;
> +extern const struct address_space_operations zisofs_aops;
>  extern int __init zisofs_init(void);
>  extern void zisofs_cleanup(void);
>  #endif
> Index: linux-2.6/fs/jffs/inode-v23.c
> ===================================================================
> --- linux-2.6.orig/fs/jffs/inode-v23.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/jffs/inode-v23.c	2006-05-03 15:04:56.000000000 +0200
> @@ -59,7 +59,7 @@
>  static struct inode_operations jffs_file_inode_operations;
>  static const struct file_operations jffs_dir_operations;
>  static struct inode_operations jffs_dir_inode_operations;
> -static struct address_space_operations jffs_address_operations;
> +static const struct address_space_operations jffs_address_operations;
>  
>  kmem_cache_t     *node_cache = NULL;
>  kmem_cache_t     *fm_cache = NULL;
> @@ -1614,7 +1614,7 @@
>  } /* jffs_ioctl()  */
>  
>  
> -static struct address_space_operations jffs_address_operations = {
> +static const struct address_space_operations jffs_address_operations = {
>  	.readpage	= jffs_readpage,
>  	.prepare_write	= jffs_prepare_write,
>  	.commit_write	= jffs_commit_write,
> Index: linux-2.6/fs/jffs2/file.c
> ===================================================================
> --- linux-2.6.orig/fs/jffs2/file.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/jffs2/file.c	2006-05-03 15:04:59.000000000 +0200
> @@ -57,7 +57,7 @@
>  	.setattr =	jffs2_setattr
>  };
>  
> -struct address_space_operations jffs2_file_address_operations =
> +const struct address_space_operations jffs2_file_address_operations =
>  {
>  	.readpage =	jffs2_readpage,
>  	.prepare_write =jffs2_prepare_write,
> Index: linux-2.6/fs/jffs2/os-linux.h
> ===================================================================
> --- linux-2.6.orig/fs/jffs2/os-linux.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/jffs2/os-linux.h	2006-05-03 15:05:02.000000000 +0200
> @@ -165,7 +165,7 @@
>  /* file.c */
>  extern const struct file_operations jffs2_file_operations;
>  extern struct inode_operations jffs2_file_inode_operations;
> -extern struct address_space_operations jffs2_file_address_operations;
> +extern const struct address_space_operations jffs2_file_address_operations;
>  int jffs2_fsync(struct file *, struct dentry *, int);
>  int jffs2_do_readpage_unlock (struct inode *inode, struct page *pg);
>  
> Index: linux-2.6/fs/jfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/jfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/jfs/inode.c	2006-05-03 15:05:04.000000000 +0200
> @@ -305,7 +305,7 @@
>  				offset, nr_segs, jfs_get_block, NULL);
>  }
>  
> -struct address_space_operations jfs_aops = {
> +const struct address_space_operations jfs_aops = {
>  	.readpage	= jfs_readpage,
>  	.readpages	= jfs_readpages,
>  	.writepage	= jfs_writepage,
> Index: linux-2.6/fs/jfs/jfs_inode.h
> ===================================================================
> --- linux-2.6.orig/fs/jfs/jfs_inode.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/jfs/jfs_inode.h	2006-05-03 15:05:06.000000000 +0200
> @@ -33,7 +33,7 @@
>  extern struct dentry *jfs_get_parent(struct dentry *dentry);
>  extern void jfs_set_inode_flags(struct inode *);
>  
> -extern struct address_space_operations jfs_aops;
> +extern const struct address_space_operations jfs_aops;
>  extern struct inode_operations jfs_dir_inode_operations;
>  extern const struct file_operations jfs_dir_operations;
>  extern struct inode_operations jfs_file_inode_operations;
> Index: linux-2.6/fs/jfs/jfs_metapage.c
> ===================================================================
> --- linux-2.6.orig/fs/jfs/jfs_metapage.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/jfs/jfs_metapage.c	2006-05-03 15:05:09.000000000 +0200
> @@ -587,7 +587,7 @@
>  	metapage_releasepage(page, 0);
>  }
>  
> -struct address_space_operations jfs_metapage_aops = {
> +const struct address_space_operations jfs_metapage_aops = {
>  	.readpage	= metapage_readpage,
>  	.writepage	= metapage_writepage,
>  	.sync_page	= block_sync_page,
> Index: linux-2.6/fs/jfs/jfs_metapage.h
> ===================================================================
> --- linux-2.6.orig/fs/jfs/jfs_metapage.h	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/jfs/jfs_metapage.h	2006-05-03 15:05:11.000000000 +0200
> @@ -139,7 +139,7 @@
>  	put_metapage(mp);
>  }
>  
> -extern struct address_space_operations jfs_metapage_aops;
> +extern const struct address_space_operations jfs_metapage_aops;
>  
>  /*
>   * This routines invalidate all pages for an extent.
> Index: linux-2.6/fs/minix/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/minix/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/minix/inode.c	2006-05-03 15:05:14.000000000 +0200
> @@ -335,7 +335,7 @@
>  {
>  	return generic_block_bmap(mapping,block,minix_get_block);
>  }
> -static struct address_space_operations minix_aops = {
> +static const struct address_space_operations minix_aops = {
>  	.readpage = minix_readpage,
>  	.writepage = minix_writepage,
>  	.sync_page = block_sync_page,
> Index: linux-2.6/fs/ncpfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/ncpfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ncpfs/inode.c	2006-05-03 15:05:16.000000000 +0200
> @@ -105,7 +105,7 @@
>  
>  extern struct dentry_operations ncp_root_dentry_operations;
>  #if defined(CONFIG_NCPFS_EXTRAS) || defined(CONFIG_NCPFS_NFS_NS)
> -extern struct address_space_operations ncp_symlink_aops;
> +extern const struct address_space_operations ncp_symlink_aops;
>  extern int ncp_symlink(struct inode*, struct dentry*, const char*);
>  #endif
>  
> Index: linux-2.6/fs/ncpfs/symlink.c
> ===================================================================
> --- linux-2.6.orig/fs/ncpfs/symlink.c	2006-03-15 11:23:53.000000000 +0100
> +++ linux-2.6/fs/ncpfs/symlink.c	2006-05-03 15:05:19.000000000 +0200
> @@ -99,7 +99,7 @@
>  /*
>   * symlinks can't do much...
>   */
> -struct address_space_operations ncp_symlink_aops = {
> +const struct address_space_operations ncp_symlink_aops = {
>  	.readpage	= ncp_symlink_readpage,
>  };
>  	
> Index: linux-2.6/fs/nfs/file.c
> ===================================================================
> --- linux-2.6.orig/fs/nfs/file.c	2006-04-25 15:53:07.000000000 +0200
> +++ linux-2.6/fs/nfs/file.c	2006-05-03 15:05:21.000000000 +0200
> @@ -328,7 +328,7 @@
>  	return !nfs_wb_page(page->mapping->host, page);
>  }
>  
> -struct address_space_operations nfs_file_aops = {
> +const struct address_space_operations nfs_file_aops = {
>  	.readpage = nfs_readpage,
>  	.readpages = nfs_readpages,
>  	.set_page_dirty = __set_page_dirty_nobuffers,
> Index: linux-2.6/fs/ntfs/aops.c
> ===================================================================
> --- linux-2.6.orig/fs/ntfs/aops.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ntfs/aops.c	2006-05-03 15:05:24.000000000 +0200
> @@ -1544,7 +1544,7 @@
>  /**
>   * ntfs_aops - general address space operations for inodes and attributes
>   */
> -struct address_space_operations ntfs_aops = {
> +const struct address_space_operations ntfs_aops = {
>  	.readpage	= ntfs_readpage,	/* Fill page with data. */
>  	.sync_page	= block_sync_page,	/* Currently, just unplugs the
>  						   disk request queue. */
> @@ -1560,7 +1560,7 @@
>   * ntfs_mst_aops - general address space operations for mst protecteed inodes
>   *		   and attributes
>   */
> -struct address_space_operations ntfs_mst_aops = {
> +const struct address_space_operations ntfs_mst_aops = {
>  	.readpage	= ntfs_readpage,	/* Fill page with data. */
>  	.sync_page	= block_sync_page,	/* Currently, just unplugs the
>  						   disk request queue. */
> Index: linux-2.6/fs/ntfs/ntfs.h
> ===================================================================
> --- linux-2.6.orig/fs/ntfs/ntfs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ntfs/ntfs.h	2006-05-03 15:05:26.000000000 +0200
> @@ -57,8 +57,8 @@
>  extern struct kmem_cache *ntfs_index_ctx_cache;
>  
>  /* The various operations structs defined throughout the driver files. */
> -extern struct address_space_operations ntfs_aops;
> -extern struct address_space_operations ntfs_mst_aops;
> +extern const struct address_space_operations ntfs_aops;
> +extern const struct address_space_operations ntfs_mst_aops;
>  
>  extern const struct  file_operations ntfs_file_ops;
>  extern struct inode_operations ntfs_file_inode_ops;
> Index: linux-2.6/fs/ocfs2/aops.c
> ===================================================================
> --- linux-2.6.orig/fs/ocfs2/aops.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ocfs2/aops.c	2006-05-03 15:05:29.000000000 +0200
> @@ -634,7 +634,7 @@
>  	return ret;
>  }
>  
> -struct address_space_operations ocfs2_aops = {
> +const struct address_space_operations ocfs2_aops = {
>  	.readpage	= ocfs2_readpage,
>  	.writepage	= ocfs2_writepage,
>  	.prepare_write	= ocfs2_prepare_write,
> Index: linux-2.6/fs/ocfs2/inode.h
> ===================================================================
> --- linux-2.6.orig/fs/ocfs2/inode.h	2006-03-15 11:23:55.000000000 +0100
> +++ linux-2.6/fs/ocfs2/inode.h	2006-05-03 15:05:31.000000000 +0200
> @@ -114,7 +114,7 @@
>  
>  extern kmem_cache_t *ocfs2_inode_cache;
>  
> -extern struct address_space_operations ocfs2_aops;
> +extern const struct address_space_operations ocfs2_aops;
>  
>  struct buffer_head *ocfs2_bread(struct inode *inode, int block,
>  				int *err, int reada);
> Index: linux-2.6/fs/qnx4/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/qnx4/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/qnx4/inode.c	2006-05-03 15:05:33.000000000 +0200
> @@ -448,7 +448,7 @@
>  {
>  	return generic_block_bmap(mapping,block,qnx4_get_block);
>  }
> -static struct address_space_operations qnx4_aops = {
> +static const struct address_space_operations qnx4_aops = {
>  	.readpage	= qnx4_readpage,
>  	.writepage	= qnx4_writepage,
>  	.sync_page	= block_sync_page,
> Index: linux-2.6/fs/ramfs/file-mmu.c
> ===================================================================
> --- linux-2.6.orig/fs/ramfs/file-mmu.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ramfs/file-mmu.c	2006-05-03 15:05:36.000000000 +0200
> @@ -26,7 +26,7 @@
>  
>  #include <linux/fs.h>
>  
> -struct address_space_operations ramfs_aops = {
> +const struct address_space_operations ramfs_aops = {
>  	.readpage	= simple_readpage,
>  	.prepare_write	= simple_prepare_write,
>  	.commit_write	= simple_commit_write
> Index: linux-2.6/fs/ramfs/file-nommu.c
> ===================================================================
> --- linux-2.6.orig/fs/ramfs/file-nommu.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ramfs/file-nommu.c	2006-05-03 15:05:38.000000000 +0200
> @@ -27,7 +27,7 @@
>  
>  static int ramfs_nommu_setattr(struct dentry *, struct iattr *);
>  
> -struct address_space_operations ramfs_aops = {
> +const struct address_space_operations ramfs_aops = {
>  	.readpage		= simple_readpage,
>  	.prepare_write		= simple_prepare_write,
>  	.commit_write		= simple_commit_write
> Index: linux-2.6/fs/ramfs/internal.h
> ===================================================================
> --- linux-2.6.orig/fs/ramfs/internal.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/ramfs/internal.h	2006-05-03 15:05:41.000000000 +0200
> @@ -10,6 +10,6 @@
>   */
>  
>  
> -extern struct address_space_operations ramfs_aops;
> +extern const struct address_space_operations ramfs_aops;
>  extern const struct file_operations ramfs_file_operations;
>  extern struct inode_operations ramfs_file_inode_operations;
> Index: linux-2.6/fs/reiserfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/reiserfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/reiserfs/inode.c	2006-05-03 15:05:43.000000000 +0200
> @@ -2996,7 +2996,7 @@
>  	return error;
>  }
>  
> -struct address_space_operations reiserfs_address_space_operations = {
> +const struct address_space_operations reiserfs_address_space_operations = {
>  	.writepage = reiserfs_writepage,
>  	.readpage = reiserfs_readpage,
>  	.readpages = reiserfs_readpages,
> Index: linux-2.6/fs/romfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/romfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/romfs/inode.c	2006-05-03 15:06:13.000000000 +0200
> @@ -459,7 +459,7 @@
>  
>  /* Mapping from our types to the kernel */
>  
> -static struct address_space_operations romfs_aops = {
> +static const struct address_space_operations romfs_aops = {
>  	.readpage = romfs_readpage
>  };
>  
> Index: linux-2.6/fs/smbfs/file.c
> ===================================================================
> --- linux-2.6.orig/fs/smbfs/file.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/smbfs/file.c	2006-05-03 15:06:17.000000000 +0200
> @@ -306,7 +306,7 @@
>  	return status;
>  }
>  
> -struct address_space_operations smb_file_aops = {
> +const struct address_space_operations smb_file_aops = {
>  	.readpage = smb_readpage,
>  	.writepage = smb_writepage,
>  	.prepare_write = smb_prepare_write,
> Index: linux-2.6/fs/smbfs/proto.h
> ===================================================================
> --- linux-2.6.orig/fs/smbfs/proto.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/smbfs/proto.h	2006-05-03 15:06:21.000000000 +0200
> @@ -63,7 +63,7 @@
>  extern int smb_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
>  extern int smb_notify_change(struct dentry *dentry, struct iattr *attr);
>  /* file.c */
> -extern struct address_space_operations smb_file_aops;
> +extern const struct address_space_operations smb_file_aops;
>  extern const struct file_operations smb_file_operations;
>  extern struct inode_operations smb_file_inode_operations;
>  /* ioctl.c */
> Index: linux-2.6/fs/sysfs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/sysfs/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/sysfs/inode.c	2006-05-03 15:06:23.000000000 +0200
> @@ -16,7 +16,7 @@
>  
>  extern struct super_block * sysfs_sb;
>  
> -static struct address_space_operations sysfs_aops = {
> +static const struct address_space_operations sysfs_aops = {
>  	.readpage	= simple_readpage,
>  	.prepare_write	= simple_prepare_write,
>  	.commit_write	= simple_commit_write
> Index: linux-2.6/fs/sysv/itree.c
> ===================================================================
> --- linux-2.6.orig/fs/sysv/itree.c	2006-03-15 11:23:56.000000000 +0100
> +++ linux-2.6/fs/sysv/itree.c	2006-05-03 15:06:26.000000000 +0200
> @@ -465,7 +465,7 @@
>  {
>  	return generic_block_bmap(mapping,block,get_block);
>  }
> -struct address_space_operations sysv_aops = {
> +const struct address_space_operations sysv_aops = {
>  	.readpage = sysv_readpage,
>  	.writepage = sysv_writepage,
>  	.sync_page = block_sync_page,
> Index: linux-2.6/fs/sysv/sysv.h
> ===================================================================
> --- linux-2.6.orig/fs/sysv/sysv.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/sysv/sysv.h	2006-05-03 15:06:28.000000000 +0200
> @@ -161,7 +161,7 @@
>  extern struct inode_operations sysv_fast_symlink_inode_operations;
>  extern const struct file_operations sysv_file_operations;
>  extern const struct file_operations sysv_dir_operations;
> -extern struct address_space_operations sysv_aops;
> +extern const struct address_space_operations sysv_aops;
>  extern struct super_operations sysv_sops;
>  extern struct dentry_operations sysv_dentry_operations;
>  
> Index: linux-2.6/fs/udf/file.c
> ===================================================================
> --- linux-2.6.orig/fs/udf/file.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/udf/file.c	2006-05-03 15:06:36.000000000 +0200
> @@ -95,7 +95,7 @@
>  	return 0;
>  }
>  
> -struct address_space_operations udf_adinicb_aops = {
> +const struct address_space_operations udf_adinicb_aops = {
>  	.readpage		= udf_adinicb_readpage,
>  	.writepage		= udf_adinicb_writepage,
>  	.sync_page		= block_sync_page,
> Index: linux-2.6/fs/udf/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/udf/inode.c	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/udf/inode.c	2006-05-03 15:06:39.000000000 +0200
> @@ -132,7 +132,7 @@
>  	return generic_block_bmap(mapping,block,udf_get_block);
>  }
>  
> -struct address_space_operations udf_aops = {
> +const struct address_space_operations udf_aops = {
>  	.readpage		= udf_readpage,
>  	.writepage		= udf_writepage,
>  	.sync_page		= block_sync_page,
> Index: linux-2.6/fs/udf/symlink.c
> ===================================================================
> --- linux-2.6.orig/fs/udf/symlink.c	2006-03-15 11:23:56.000000000 +0100
> +++ linux-2.6/fs/udf/symlink.c	2006-05-03 15:06:41.000000000 +0200
> @@ -113,6 +113,6 @@
>  /*
>   * symlinks can't do much...
>   */
> -struct address_space_operations udf_symlink_aops = {
> +const struct address_space_operations udf_symlink_aops = {
>  	.readpage		= udf_symlink_filler,
>  };
> Index: linux-2.6/fs/udf/udfdecl.h
> ===================================================================
> --- linux-2.6.orig/fs/udf/udfdecl.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/udf/udfdecl.h	2006-05-03 15:06:44.000000000 +0200
> @@ -47,9 +47,9 @@
>  extern const struct file_operations udf_dir_operations;
>  extern struct inode_operations udf_file_inode_operations;
>  extern const struct file_operations udf_file_operations;
> -extern struct address_space_operations udf_aops;
> -extern struct address_space_operations udf_adinicb_aops;
> -extern struct address_space_operations udf_symlink_aops;
> +extern const struct address_space_operations udf_aops;
> +extern const struct address_space_operations udf_adinicb_aops;
> +extern const struct address_space_operations udf_symlink_aops;
>  
>  struct udf_fileident_bh
>  {
> Index: linux-2.6/fs/ufs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/ufs/inode.c	2006-03-15 11:23:56.000000000 +0100
> +++ linux-2.6/fs/ufs/inode.c	2006-05-03 15:06:46.000000000 +0200
> @@ -531,7 +531,7 @@
>  {
>  	return generic_block_bmap(mapping,block,ufs_getfrag_block);
>  }
> -struct address_space_operations ufs_aops = {
> +const struct address_space_operations ufs_aops = {
>  	.readpage = ufs_readpage,
>  	.writepage = ufs_writepage,
>  	.sync_page = block_sync_page,
> Index: linux-2.6/fs/xfs/linux-2.6/xfs_aops.c
> ===================================================================
> --- linux-2.6.orig/fs/xfs/linux-2.6/xfs_aops.c	2006-04-25 15:53:07.000000000 +0200
> +++ linux-2.6/fs/xfs/linux-2.6/xfs_aops.c	2006-05-03 15:06:49.000000000 +0200
> @@ -1448,7 +1448,7 @@
>  	block_invalidatepage(page, offset);
>  }
>  
> -struct address_space_operations xfs_address_space_operations = {
> +const struct address_space_operations xfs_address_space_operations = {
>  	.readpage		= xfs_vm_readpage,
>  	.readpages		= xfs_vm_readpages,
>  	.writepage		= xfs_vm_writepage,
> Index: linux-2.6/fs/xfs/linux-2.6/xfs_aops.h
> ===================================================================
> --- linux-2.6.orig/fs/xfs/linux-2.6/xfs_aops.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/fs/xfs/linux-2.6/xfs_aops.h	2006-05-03 15:06:52.000000000 +0200
> @@ -40,7 +40,7 @@
>  	struct work_struct	io_work;	/* xfsdatad work queue */
>  } xfs_ioend_t;
>  
> -extern struct address_space_operations xfs_address_space_operations;
> +extern const struct address_space_operations xfs_address_space_operations;
>  extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
>  
>  #endif /* __XFS_IOPS_H__ */
> Index: linux-2.6/fs/xfs/linux-2.6/xfs_buf.c
> ===================================================================
> --- linux-2.6.orig/fs/xfs/linux-2.6/xfs_buf.c	2006-04-25 15:53:07.000000000 +0200
> +++ linux-2.6/fs/xfs/linux-2.6/xfs_buf.c	2006-05-03 15:07:00.000000000 +0200
> @@ -1520,7 +1520,7 @@
>  	struct backing_dev_info	*bdi;
>  	struct inode		*inode;
>  	struct address_space	*mapping;
> -	static struct address_space_operations mapping_aops = {
> +	static const struct address_space_operations mapping_aops = {
>  		.sync_page = block_sync_page,
>  		.migratepage = fail_migrate_page,
>  	};
> Index: linux-2.6/include/linux/coda_linux.h
> ===================================================================
> --- linux-2.6.orig/include/linux/coda_linux.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/include/linux/coda_linux.h	2006-05-03 15:07:08.000000000 +0200
> @@ -27,8 +27,8 @@
>  extern struct inode_operations coda_file_inode_operations;
>  extern struct inode_operations coda_ioctl_inode_operations;
>  
> -extern struct address_space_operations coda_file_aops;
> -extern struct address_space_operations coda_symlink_aops;
> +extern const struct address_space_operations coda_file_aops;
> +extern const struct address_space_operations coda_symlink_aops;
>  
>  extern const struct file_operations coda_dir_operations;
>  extern const struct file_operations coda_file_operations;
> Index: linux-2.6/include/linux/efs_fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/efs_fs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/include/linux/efs_fs.h	2006-05-03 15:07:12.000000000 +0200
> @@ -38,7 +38,7 @@
>  
>  extern struct inode_operations efs_dir_inode_operations;
>  extern const struct file_operations efs_dir_operations;
> -extern struct address_space_operations efs_symlink_aops;
> +extern const struct address_space_operations efs_symlink_aops;
>  
>  extern void efs_read_inode(struct inode *);
>  extern efs_block_t efs_map_block(struct inode *, efs_block_t);
> Index: linux-2.6/include/linux/fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/fs.h	2006-04-25 15:53:07.000000000 +0200
> +++ linux-2.6/include/linux/fs.h	2006-05-03 14:59:10.000000000 +0200
> @@ -388,7 +388,7 @@
>  	unsigned int		truncate_count;	/* Cover race condition with truncate */
>  	unsigned long		nrpages;	/* number of total pages */
>  	pgoff_t			writeback_index;/* writeback starts here */
> -	struct address_space_operations *a_ops;	/* methods */
> +	const struct address_space_operations *a_ops;	/* methods */
>  	unsigned long		flags;		/* error bits/gfp mask */
>  	struct backing_dev_info *backing_dev_info; /* device readahead, etc */
>  	spinlock_t		private_lock;	/* for use by the address_space */
> @@ -1400,7 +1400,7 @@
>  extern void bdput(struct block_device *);
>  extern struct block_device *open_by_devnum(dev_t, unsigned);
>  extern const struct file_operations def_blk_fops;
> -extern struct address_space_operations def_blk_aops;
> +extern const struct address_space_operations def_blk_aops;
>  extern const struct file_operations def_chr_fops;
>  extern const struct file_operations bad_sock_fops;
>  extern const struct file_operations def_fifo_fops;
> Index: linux-2.6/include/linux/nfs_fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/nfs_fs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/include/linux/nfs_fs.h	2006-05-03 15:07:24.000000000 +0200
> @@ -325,7 +325,7 @@
>  extern struct inode_operations nfs3_file_inode_operations;
>  #endif /* CONFIG_NFS_V3 */
>  extern const struct file_operations nfs_file_operations;
> -extern struct address_space_operations nfs_file_aops;
> +extern const struct address_space_operations nfs_file_aops;
>  
>  static inline struct rpc_cred *nfs_file_cred(struct file *file)
>  {
> Index: linux-2.6/include/linux/reiserfs_fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/reiserfs_fs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/include/linux/reiserfs_fs.h	2006-05-03 15:07:27.000000000 +0200
> @@ -1973,7 +1973,7 @@
>  /* file.c */
>  extern struct inode_operations reiserfs_file_inode_operations;
>  extern const struct file_operations reiserfs_file_operations;
> -extern struct address_space_operations reiserfs_address_space_operations;
> +extern const struct address_space_operations reiserfs_address_space_operations;
>  
>  /* fix_nodes.c */
>  
> Index: linux-2.6/include/linux/ufs_fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/ufs_fs.h	2006-04-04 16:50:12.000000000 +0200
> +++ linux-2.6/include/linux/ufs_fs.h	2006-05-03 15:07:30.000000000 +0200
> @@ -897,7 +897,7 @@
>  extern struct inode_operations ufs_file_inode_operations;
>  extern const struct file_operations ufs_file_operations;
>  
> -extern struct address_space_operations ufs_aops;
> +extern const struct address_space_operations ufs_aops;
>  
>  /* ialloc.c */
>  extern void ufs_free_inode (struct inode *inode);
> Index: linux-2.6/mm/filemap.c
> ===================================================================
> --- linux-2.6.orig/mm/filemap.c	2006-04-28 19:25:49.000000000 +0200
> +++ linux-2.6/mm/filemap.c	2006-05-03 15:07:39.000000000 +0200
> @@ -1978,7 +1978,7 @@
>  {
>  	struct file *file = iocb->ki_filp;
>  	struct address_space * mapping = file->f_mapping;
> -	struct address_space_operations *a_ops = mapping->a_ops;
> +	const struct address_space_operations *a_ops = mapping->a_ops;
>  	struct inode 	*inode = mapping->host;
>  	long		status = 0;
>  	struct page	*page;
> Index: linux-2.6/mm/filemap_xip.c
> ===================================================================
> --- linux-2.6.orig/mm/filemap_xip.c	2006-03-15 11:24:02.000000000 +0100
> +++ linux-2.6/mm/filemap_xip.c	2006-05-03 15:07:44.000000000 +0200
> @@ -273,7 +273,7 @@
>  		  size_t count, loff_t pos, loff_t *ppos)
>  {
>  	struct address_space * mapping = filp->f_mapping;
> -	struct address_space_operations *a_ops = mapping->a_ops;
> +	const struct address_space_operations *a_ops = mapping->a_ops;
>  	struct inode 	*inode = mapping->host;
>  	long		status = 0;
>  	struct page	*page;
> Index: linux-2.6/mm/shmem.c
> ===================================================================
> --- linux-2.6.orig/mm/shmem.c	2006-04-25 15:53:07.000000000 +0200
> +++ linux-2.6/mm/shmem.c	2006-05-03 15:07:51.000000000 +0200
> @@ -174,7 +174,7 @@
>  }
>  
>  static struct super_operations shmem_ops;
> -static struct address_space_operations shmem_aops;
> +static const struct address_space_operations shmem_aops;
>  static struct file_operations shmem_file_operations;
>  static struct inode_operations shmem_inode_operations;
>  static struct inode_operations shmem_dir_inode_operations;
> @@ -2168,7 +2168,7 @@
>  		printk(KERN_INFO "shmem_inode_cache: not all structures were freed\n");
>  }
>  
> -static struct address_space_operations shmem_aops = {
> +static const struct address_space_operations shmem_aops = {
>  	.writepage	= shmem_writepage,
>  	.set_page_dirty	= __set_page_dirty_nobuffers,
>  #ifdef CONFIG_TMPFS
> Index: linux-2.6/mm/swap_state.c
> ===================================================================
> --- linux-2.6.orig/mm/swap_state.c	2006-04-04 16:50:13.000000000 +0200
> +++ linux-2.6/mm/swap_state.c	2006-05-03 15:07:57.000000000 +0200
> @@ -24,7 +24,7 @@
>   * vmscan's shrink_list, to make sync_page look nicer, and to allow
>   * future use of radix_tree tags in the swap cache.
>   */
> -static struct address_space_operations swap_aops = {
> +static const struct address_space_operations swap_aops = {
>  	.writepage	= swap_writepage,
>  	.sync_page	= block_sync_page,
>  	.set_page_dirty	= __set_page_dirty_nobuffers,
> -
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-- 
Thanks & Regards
Prasanna S Panchamukhi
Linux Technology Center
India Software Labs, IBM Bangalore
Email: prasanna@in.ibm.com
Ph: 91-80-41776329