[PATCH] Make most file operations structs in fs/ const

This is a conversion to make the various file_operations structs in fs/
const.  Basically a regexp job, with a few manual fixups

The goal is both to increase correctness (harder to accidentally write to
shared datastructures) and reducing the false sharing of cachelines with
things that get dirty in .data (while .rodata is nicely read only and thus
cache clean)

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/ntfs/dir.c

@@ -1553,7 +1553,7 @@ static int ntfs_dir_fsync(struct file *filp, struct dentry *dentry,
 
 #endif /* NTFS_RW */
 
-struct file_operations ntfs_dir_ops = {
+const struct file_operations ntfs_dir_ops = {
 	.llseek		= generic_file_llseek,	/* Seek inside directory. */
 	.read		= generic_read_dir,	/* Return -EISDIR. */
 	.readdir	= ntfs_readdir,		/* Read directory contents. */

fs/ntfs/file.c

@@ -2294,7 +2294,7 @@ static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
 
 #endif /* NTFS_RW */
 
-struct file_operations ntfs_file_ops = {
+const struct file_operations ntfs_file_ops = {
 	.llseek		= generic_file_llseek,	 /* Seek inside file. */
 	.read		= generic_file_read,	 /* Read from file. */
 	.aio_read	= generic_file_aio_read, /* Async read from file. */
@@ -2337,6 +2337,6 @@ struct inode_operations ntfs_file_inode_ops = {
 #endif /* NTFS_RW */
 };
 
-struct file_operations ntfs_empty_file_ops = {};
+const struct file_operations ntfs_empty_file_ops = {};
 
 struct inode_operations ntfs_empty_inode_ops = {};

fs/ntfs/ntfs.h

@@ -60,13 +60,13 @@ extern struct kmem_cache *ntfs_index_ctx_cache;
 extern struct address_space_operations ntfs_aops;
 extern struct address_space_operations ntfs_mst_aops;
 
-extern struct  file_operations ntfs_file_ops;
+extern const struct  file_operations ntfs_file_ops;
 extern struct inode_operations ntfs_file_inode_ops;
 
-extern struct  file_operations ntfs_dir_ops;
+extern const struct  file_operations ntfs_dir_ops;
 extern struct inode_operations ntfs_dir_inode_ops;
 
-extern struct  file_operations ntfs_empty_file_ops;
+extern const struct  file_operations ntfs_empty_file_ops;
 extern struct inode_operations ntfs_empty_inode_ops;
 
 extern struct export_operations ntfs_export_ops;