[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 <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
RyanHsu · Mar 28, 2006 · 4b6f5d2 · 4b6f5d2
1 parent 99ac48f
commit 4b6f5d2
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diff --git a/drivers/misc/ibmasm/ibmasmfs.c b/drivers/misc/ibmasm/ibmasmfs.c
@@ -101,7 +101,7 @@ static struct super_operations ibmasmfs_s_ops = {
 	.drop_inode	= generic_delete_inode,
 };
 
-static struct file_operations *ibmasmfs_dir_ops = &simple_dir_operations;
+static const struct file_operations *ibmasmfs_dir_ops = &simple_dir_operations;
 
 static struct file_system_type ibmasmfs_type = {
 	.owner          = THIS_MODULE,

diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
@@ -39,8 +39,8 @@
 
 extern struct file_system_type v9fs_fs_type;
 extern struct address_space_operations v9fs_addr_operations;
-extern struct file_operations v9fs_file_operations;
-extern struct file_operations v9fs_dir_operations;
+extern const struct file_operations v9fs_file_operations;
+extern const struct file_operations v9fs_dir_operations;
 extern struct dentry_operations v9fs_dentry_operations;
 
 struct inode *v9fs_get_inode(struct super_block *sb, int mode);

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
@@ -204,7 +204,7 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
 	return 0;
 }
 
-struct file_operations v9fs_dir_operations = {
+const struct file_operations v9fs_dir_operations = {
 	.read = generic_read_dir,
 	.readdir = v9fs_dir_readdir,
 	.open = v9fs_file_open,

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
@@ -266,7 +266,7 @@ v9fs_file_write(struct file *filp, const char __user * data,
 	return total;
 }
 
-struct file_operations v9fs_file_operations = {
+const struct file_operations v9fs_file_operations = {
 	.llseek = generic_file_llseek,
 	.read = v9fs_file_read,
 	.write = v9fs_file_write,

diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h
@@ -85,7 +85,7 @@ void __adfs_error(struct super_block *sb, const char *function,
 
 /* dir_*.c */
 extern struct inode_operations adfs_dir_inode_operations;
-extern struct file_operations adfs_dir_operations;
+extern const struct file_operations adfs_dir_operations;
 extern struct dentry_operations adfs_dentry_operations;
 extern struct adfs_dir_ops adfs_f_dir_ops;
 extern struct adfs_dir_ops adfs_fplus_dir_ops;
@@ -94,7 +94,7 @@ extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
 
 /* file.c */
 extern struct inode_operations adfs_file_inode_operations;
-extern struct file_operations adfs_file_operations;
+extern const struct file_operations adfs_file_operations;
 
 static inline __u32 signed_asl(__u32 val, signed int shift)
 {

diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
@@ -196,7 +196,7 @@ adfs_dir_lookup_byname(struct inode *inode, struct qstr *name, struct object_inf
 	return ret;
 }
 
-struct file_operations adfs_dir_operations = {
+const struct file_operations adfs_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= adfs_readdir,
 	.fsync		= file_fsync,

diff --git a/fs/adfs/file.c b/fs/adfs/file.c
@@ -25,7 +25,7 @@
 
 #include "adfs.h"
 
-struct file_operations adfs_file_operations = {
+const struct file_operations adfs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_file_read,
 	.mmap		= generic_file_mmap,

diff --git a/fs/affs/affs.h b/fs/affs/affs.h
@@ -192,9 +192,9 @@ extern void   affs_dir_truncate(struct inode *);
 extern struct inode_operations	 affs_file_inode_operations;
 extern struct inode_operations	 affs_dir_inode_operations;
 extern struct inode_operations   affs_symlink_inode_operations;
-extern struct file_operations	 affs_file_operations;
-extern struct file_operations	 affs_file_operations_ofs;
-extern struct file_operations	 affs_dir_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;

diff --git a/fs/affs/dir.c b/fs/affs/dir.c
@@ -17,7 +17,7 @@
 
 static int affs_readdir(struct file *, void *, filldir_t);
 
-struct file_operations affs_dir_operations = {
+const struct file_operations affs_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= affs_readdir,
 	.fsync		= file_fsync,

diff --git a/fs/affs/file.c b/fs/affs/file.c
@@ -25,7 +25,7 @@ static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
 static int affs_file_open(struct inode *inode, struct file *filp);
 static int affs_file_release(struct inode *inode, struct file *filp);
 
-struct file_operations affs_file_operations = {
+const struct file_operations affs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_file_read,
 	.write		= generic_file_write,

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
@@ -32,7 +32,7 @@ static int afs_d_delete(struct dentry *dentry);
 static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen,
 				  loff_t fpos, ino_t ino, unsigned dtype);
 
-struct file_operations afs_dir_file_operations = {
+const struct file_operations afs_dir_file_operations = {
 	.open		= afs_dir_open,
 	.readdir	= afs_dir_readdir,
 };

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
@@ -64,7 +64,7 @@ extern struct cachefs_index_def afs_cache_cell_index_def;
  * dir.c
  */
 extern struct inode_operations afs_dir_inode_operations;
-extern struct file_operations afs_dir_file_operations;
+extern const struct file_operations afs_dir_file_operations;
 
 /*
  * file.c
@@ -105,7 +105,7 @@ extern struct cachefs_netfs afs_cache_netfs;
  * mntpt.c
  */
 extern struct inode_operations afs_mntpt_inode_operations;
-extern struct file_operations afs_mntpt_file_operations;
+extern const struct file_operations afs_mntpt_file_operations;
 extern struct afs_timer afs_mntpt_expiry_timer;
 extern struct afs_timer_ops afs_mntpt_expiry_timer_ops;
 extern unsigned long afs_mntpt_expiry_timeout;

diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
@@ -32,7 +32,7 @@ static struct dentry *afs_mntpt_lookup(struct inode *dir,
 static int afs_mntpt_open(struct inode *inode, struct file *file);
 static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd);
 
-struct file_operations afs_mntpt_file_operations = {
+const struct file_operations afs_mntpt_file_operations = {
 	.open		= afs_mntpt_open,
 };
 

diff --git a/fs/afs/proc.c b/fs/afs/proc.c
@@ -37,7 +37,7 @@ static struct seq_operations afs_proc_cells_ops = {
 	.show	= afs_proc_cells_show,
 };
 
-static struct file_operations afs_proc_cells_fops = {
+static const struct file_operations afs_proc_cells_fops = {
 	.open		= afs_proc_cells_open,
 	.read		= seq_read,
 	.write		= afs_proc_cells_write,
@@ -53,7 +53,7 @@ static ssize_t afs_proc_rootcell_write(struct file *file,
 				       const char __user *buf,
 				       size_t size, loff_t *_pos);
 
-static struct file_operations afs_proc_rootcell_fops = {
+static const struct file_operations afs_proc_rootcell_fops = {
 	.open		= afs_proc_rootcell_open,
 	.read		= afs_proc_rootcell_read,
 	.write		= afs_proc_rootcell_write,
@@ -77,7 +77,7 @@ static struct seq_operations afs_proc_cell_volumes_ops = {
 	.show	= afs_proc_cell_volumes_show,
 };
 
-static struct file_operations afs_proc_cell_volumes_fops = {
+static const struct file_operations afs_proc_cell_volumes_fops = {
 	.open		= afs_proc_cell_volumes_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
@@ -101,7 +101,7 @@ static struct seq_operations afs_proc_cell_vlservers_ops = {
 	.show	= afs_proc_cell_vlservers_show,
 };
 
-static struct file_operations afs_proc_cell_vlservers_fops = {
+static const struct file_operations afs_proc_cell_vlservers_fops = {
 	.open		= afs_proc_cell_vlservers_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
@@ -124,7 +124,7 @@ static struct seq_operations afs_proc_cell_servers_ops = {
 	.show	= afs_proc_cell_servers_show,
 };
 
-static struct file_operations afs_proc_cell_servers_fops = {
+static const struct file_operations afs_proc_cell_servers_fops = {
 	.open		= afs_proc_cell_servers_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,

diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h
@@ -146,7 +146,7 @@ struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info
 
 extern struct inode_operations autofs_root_inode_operations;
 extern struct inode_operations autofs_symlink_inode_operations;
-extern struct file_operations autofs_root_operations;
+extern const struct file_operations autofs_root_operations;
 
 /* Initializing function */
 

diff --git a/fs/autofs/root.c b/fs/autofs/root.c
@@ -26,7 +26,7 @@ static int autofs_root_rmdir(struct inode *,struct dentry *);
 static int autofs_root_mkdir(struct inode *,struct dentry *,int);
 static int autofs_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
 
-struct file_operations autofs_root_operations = {
+const struct file_operations autofs_root_operations = {
 	.read		= generic_read_dir,
 	.readdir	= autofs_root_readdir,
 	.ioctl		= autofs_root_ioctl,

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
@@ -176,8 +176,8 @@ extern struct inode_operations autofs4_dir_inode_operations;
 extern struct inode_operations autofs4_root_inode_operations;
 extern struct inode_operations autofs4_indirect_root_inode_operations;
 extern struct inode_operations autofs4_direct_root_inode_operations;
-extern struct file_operations autofs4_dir_operations;
-extern struct file_operations autofs4_root_operations;
+extern const struct file_operations autofs4_dir_operations;
+extern const struct file_operations autofs4_root_operations;
 
 /* Initializing function */
 

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
@@ -32,15 +32,15 @@ static int autofs4_root_readdir(struct file * filp, void * dirent, filldir_t fil
 static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
 static void *autofs4_follow_link(struct dentry *, struct nameidata *);
 
-struct file_operations autofs4_root_operations = {
+const struct file_operations autofs4_root_operations = {
 	.open		= dcache_dir_open,
 	.release	= dcache_dir_close,
 	.read		= generic_read_dir,
 	.readdir	= autofs4_root_readdir,
 	.ioctl		= autofs4_root_ioctl,
 };
 
-struct file_operations autofs4_dir_operations = {
+const struct file_operations autofs4_dir_operations = {
 	.open		= autofs4_dir_open,
 	.release	= autofs4_dir_close,
 	.read		= generic_read_dir,

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
@@ -22,7 +22,7 @@ static int return_EIO(void)
 
 #define EIO_ERROR ((void *) (return_EIO))
 
-static struct file_operations bad_file_ops =
+static const struct file_operations bad_file_ops =
 {
 	.llseek		= EIO_ERROR,
 	.aio_read	= EIO_ERROR,

diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
@@ -64,7 +64,7 @@ static const struct super_operations befs_sops = {
 /* slab cache for befs_inode_info objects */
 static kmem_cache_t *befs_inode_cachep;
 
-static struct file_operations befs_dir_operations = {
+static const struct file_operations befs_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= befs_readdir,
 };

diff --git a/fs/bfs/bfs.h b/fs/bfs/bfs.h
@@ -49,11 +49,11 @@ static inline struct bfs_inode_info *BFS_I(struct inode *inode)
 
 /* file.c */
 extern struct inode_operations bfs_file_inops;
-extern struct file_operations bfs_file_operations;
+extern const struct file_operations bfs_file_operations;
 extern struct address_space_operations bfs_aops;
 
 /* dir.c */
 extern struct inode_operations bfs_dir_inops;
-extern struct file_operations bfs_dir_operations;
+extern const struct file_operations bfs_dir_operations;
 
 #endif /* _FS_BFS_BFS_H */
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
@@ -70,7 +70,7 @@ static int bfs_readdir(struct file * f, void * dirent, filldir_t filldir)
 	return 0;	
 }
 
-struct file_operations bfs_dir_operations = {
+const struct file_operations bfs_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= bfs_readdir,
 	.fsync		= file_fsync,

diff --git a/fs/bfs/file.c b/fs/bfs/file.c
@@ -17,7 +17,7 @@
 #define dprintf(x...)
 #endif
 
-struct file_operations bfs_file_operations = {
+const struct file_operations bfs_file_operations = {
 	.llseek 	= generic_file_llseek,
 	.read		= generic_file_read,
 	.write		= generic_file_write,

diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
@@ -600,7 +600,7 @@ static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
 	return count;
 }
 
-static struct file_operations bm_entry_operations = {
+static const struct file_operations bm_entry_operations = {
 	.read		= bm_entry_read,
 	.write		= bm_entry_write,
 };
@@ -668,7 +668,7 @@ static ssize_t bm_register_write(struct file *file, const char __user *buffer,
 	return count;
 }
 
-static struct file_operations bm_register_operations = {
+static const struct file_operations bm_register_operations = {
 	.write		= bm_register_write,
 };
 
@@ -715,7 +715,7 @@ static ssize_t bm_status_write(struct file * file, const char __user * buffer,
 	return count;
 }
 
-static struct file_operations bm_status_operations = {
+static const struct file_operations bm_status_operations = {
 	.read		= bm_status_read,
 	.write		= bm_status_write,
 };

diff --git a/fs/block_dev.c b/fs/block_dev.c
@@ -1087,7 +1087,7 @@ struct address_space_operations def_blk_aops = {
 	.direct_IO	= blkdev_direct_IO,
 };
 
-struct file_operations def_blk_fops = {
+const struct file_operations def_blk_fops = {
 	.open		= blkdev_open,
 	.release	= blkdev_close,
 	.llseek		= block_llseek,

diff --git a/fs/char_dev.c b/fs/char_dev.c
@@ -406,7 +406,7 @@ static void cdev_purge(struct cdev *cdev)
  * is contain the open that then fills in the correct operations
  * depending on the special file...
  */
-struct file_operations def_chr_fops = {
+const struct file_operations def_chr_fops = {
 	.open = chrdev_open,
 };
 

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
@@ -583,7 +583,7 @@ struct inode_operations cifs_symlink_inode_ops = {
 #endif 
 };
 
-struct file_operations cifs_file_ops = {
+const struct file_operations cifs_file_ops = {
 	.read = do_sync_read,
 	.write = do_sync_write,
 	.readv = generic_file_readv,
@@ -607,7 +607,7 @@ struct file_operations cifs_file_ops = {
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
-struct file_operations cifs_file_direct_ops = {
+const struct file_operations cifs_file_direct_ops = {
 	/* no mmap, no aio, no readv - 
 	   BB reevaluate whether they can be done with directio, no cache */
 	.read = cifs_user_read,
@@ -626,7 +626,7 @@ struct file_operations cifs_file_direct_ops = {
 	.dir_notify = cifs_dir_notify,
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
-struct file_operations cifs_file_nobrl_ops = {
+const struct file_operations cifs_file_nobrl_ops = {
 	.read = do_sync_read,
 	.write = do_sync_write,
 	.readv = generic_file_readv,
@@ -649,7 +649,7 @@ struct file_operations cifs_file_nobrl_ops = {
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
-struct file_operations cifs_file_direct_nobrl_ops = {
+const struct file_operations cifs_file_direct_nobrl_ops = {
 	/* no mmap, no aio, no readv - 
 	   BB reevaluate whether they can be done with directio, no cache */
 	.read = cifs_user_read,
@@ -668,7 +668,7 @@ struct file_operations cifs_file_direct_nobrl_ops = {
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
-struct file_operations cifs_dir_ops = {
+const struct file_operations cifs_dir_ops = {
 	.readdir = cifs_readdir,
 	.release = cifs_closedir,
 	.read    = generic_read_dir,

diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
@@ -61,10 +61,10 @@ extern struct inode_operations cifs_file_inode_ops;
 extern struct inode_operations cifs_symlink_inode_ops;
 
 /* Functions related to files and directories */
-extern struct file_operations cifs_file_ops;
-extern struct file_operations cifs_file_direct_ops; /* if directio mount */
-extern struct file_operations cifs_file_nobrl_ops;
-extern struct file_operations cifs_file_direct_nobrl_ops; /* if directio mount */
+extern const struct file_operations cifs_file_ops;
+extern const struct file_operations cifs_file_direct_ops; /* if directio mount */
+extern const struct file_operations cifs_file_nobrl_ops;
+extern const struct file_operations cifs_file_direct_nobrl_ops; /* if directio mount */
 extern int cifs_open(struct inode *inode, struct file *file);
 extern int cifs_close(struct inode *inode, struct file *file);
 extern int cifs_closedir(struct inode *inode, struct file *file);
@@ -76,7 +76,7 @@ extern int cifs_lock(struct file *, int, struct file_lock *);
 extern int cifs_fsync(struct file *, struct dentry *, int);
 extern int cifs_flush(struct file *);
 extern int cifs_file_mmap(struct file * , struct vm_area_struct *);
-extern struct file_operations cifs_dir_ops;
+extern const struct file_operations cifs_dir_ops;
 extern int cifs_dir_open(struct inode *inode, struct file *file);
 extern int cifs_readdir(struct file *file, void *direntry, filldir_t filldir);
 extern int cifs_dir_notify(struct file *, unsigned long arg);