file RCU optimization: Drop rcu field and restore old name for fu_list.

The slab has its own RCU blocks so no need to have that in the files
structure.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.18-rc6-mm2/drivers/char/tty_io.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/drivers/char/tty_io.c	2006-09-12 21:03:34.000000000 -0500
+++ linux-2.6.18-rc6-mm2/drivers/char/tty_io.c	2006-09-12 21:04:57.210121809 -0500
@@ -1299,7 +1299,7 @@
 	check_tty_count(tty, "do_tty_hangup");
 	file_list_lock();
 	/* This breaks for file handles being sent over AF_UNIX sockets ? */
-	list_for_each_entry(filp, &tty->tty_files, f_u.fu_list) {
+	list_for_each_entry(filp, &tty->tty_files, f_list) {
 		if (filp->f_op->write == redirected_tty_write)
 			cons_filp = filp;
 		if (filp->f_op->write != tty_write)
Index: linux-2.6.18-rc6-mm2/fs/dquot.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/fs/dquot.c	2006-09-12 21:03:34.000000000 -0500
+++ linux-2.6.18-rc6-mm2/fs/dquot.c	2006-09-12 21:04:57.235514588 -0500
@@ -693,7 +693,7 @@
 restart:
 	file_list_lock();
 	list_for_each(p, &sb->s_files) {
-		struct file *filp = list_entry(p, struct file, f_u.fu_list);
+		struct file *filp = list_entry(p, struct file, f_list);
 		struct inode *inode = filp->f_dentry->d_inode;
 		if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) {
 			struct dentry *dentry = dget(filp->f_dentry);
Index: linux-2.6.18-rc6-mm2/security/selinux/selinuxfs.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/security/selinux/selinuxfs.c	2006-09-12 21:03:34.000000000 -0500
+++ linux-2.6.18-rc6-mm2/security/selinux/selinuxfs.c	2006-09-12 21:04:57.264813947 -0500
@@ -964,7 +964,7 @@
 
 	file_list_lock();
 	list_for_each(p, &sb->s_files) {
-		struct file * filp = list_entry(p, struct file, f_u.fu_list);
+		struct file * filp = list_entry(p, struct file, f_list);
 		struct dentry * dentry = filp->f_dentry;
 
 		if (dentry->d_parent != de) {
Index: linux-2.6.18-rc6-mm2/include/linux/fs.h
===================================================================
--- linux-2.6.18-rc6-mm2.orig/include/linux/fs.h	2006-09-12 21:03:48.000000000 -0500
+++ linux-2.6.18-rc6-mm2/include/linux/fs.h	2006-09-12 21:04:57.296066597 -0500
@@ -790,14 +790,7 @@
 #define RA_FLAG_EOF		(1UL<<27) /* readahead hits EOF */
 
 struct file {
-	/*
-	 * fu_list becomes invalid after file_free is called and queued via
-	 * fu_rcuhead for RCU freeing
-	 */
-	union {
-		struct list_head	fu_list;
-		struct rcu_head 	fu_rcuhead;
-	} f_u;
+	struct list_head	f_list;
 	struct dentry		*f_dentry;
 	struct vfsmount         *f_vfsmnt;
 	const struct file_operations	*f_op;
Index: linux-2.6.18-rc6-mm2/fs/file_table.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/fs/file_table.c	2006-09-12 21:04:13.000000000 -0500
+++ linux-2.6.18-rc6-mm2/fs/file_table.c	2006-09-12 21:04:57.315599504 -0500
@@ -43,7 +43,7 @@
 			return;
 
 	memset(f, 0, sizeof(*f));
-	INIT_LIST_HEAD(&f->f_u.fu_list);
+	INIT_LIST_HEAD(&f->f_list);
 	atomic_set(&f->f_count, 0);
 	rwlock_init(&f->f_owner.lock);
 	eventpoll_init_file(f);
@@ -273,15 +273,15 @@
 	if (!list)
 		return;
 	file_list_lock();
-	list_move(&file->f_u.fu_list, list);
+	list_move(&file->f_list, list);
 	file_list_unlock();
 }
 
 void file_kill(struct file *file)
 {
-	if (!list_empty(&file->f_u.fu_list)) {
+	if (!list_empty(&file->f_list)) {
 		file_list_lock();
-		list_del_init(&file->f_u.fu_list);
+		list_del_init(&file->f_list);
 		file_list_unlock();
 	}
 }
@@ -293,7 +293,7 @@
 	/* Check that no files are currently opened for writing. */
 	file_list_lock();
 	list_for_each(p, &sb->s_files) {
-		struct file *file = list_entry(p, struct file, f_u.fu_list);
+		struct file *file = list_entry(p, struct file, f_list);
 		struct inode *inode = file->f_dentry->d_inode;
 
 		/* File with pending delete? */
Index: linux-2.6.18-rc6-mm2/fs/super.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/fs/super.c	2006-09-12 21:03:34.000000000 -0500
+++ linux-2.6.18-rc6-mm2/fs/super.c	2006-09-12 21:04:57.328295893 -0500
@@ -551,7 +551,7 @@
 	struct file *f;
 
 	file_list_lock();
-	list_for_each_entry(f, &sb->s_files, f_u.fu_list) {
+	list_for_each_entry(f, &sb->s_files, f_list) {
 		if (S_ISREG(f->f_dentry->d_inode->i_mode) && file_count(f))
 			f->f_mode &= ~FMODE_WRITE;
 	}
Index: linux-2.6.18-rc6-mm2/security/selinux/hooks.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/security/selinux/hooks.c	2006-09-12 21:03:34.000000000 -0500
+++ linux-2.6.18-rc6-mm2/security/selinux/hooks.c	2006-09-12 21:04:57.354665317 -0500
@@ -1697,7 +1697,7 @@
 	tty = current->signal->tty;
 	if (tty) {
 		file_list_lock();
-		file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
+		file = list_entry(tty->tty_files.next, typeof(*file), f_list);
 		if (file) {
 			/* Revalidate access to controlling tty.
 			   Use inode_has_perm on the tty inode directly rather
Index: linux-2.6.18-rc6-mm2/fs/proc/generic.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/fs/proc/generic.c	2006-09-12 21:03:34.000000000 -0500
+++ linux-2.6.18-rc6-mm2/fs/proc/generic.c	2006-09-12 21:04:57.381034740 -0500
@@ -557,7 +557,7 @@
 	 */
 	file_list_lock();
 	list_for_each(p, &sb->s_files) {
-		struct file * filp = list_entry(p, struct file, f_u.fu_list);
+		struct file * filp = list_entry(p, struct file, f_list);
 		struct dentry * dentry = filp->f_dentry;
 		struct inode * inode;
 		const struct file_operations *fops;