Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

8 files changed, 2060 insertions, 0 deletions

diff --git a/fs/autofs4/Makefile b/fs/autofs4/Makefile
new file mode 100644
index 00000000000..f2c3b79e94d
--- /dev/null
+++ b/fs/autofs4/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux autofs-filesystem routines.
+#
+
+obj-$(CONFIG_AUTOFS4_FS) += autofs4.o
+
+autofs4-objs := init.o inode.o root.o symlink.o waitq.o expire.o
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
new file mode 100644
index 00000000000..f5a52c87172
--- /dev/null
+++ b/fs/autofs4/autofs_i.h
@@ -0,0 +1,193 @@
+/* -*- c -*- ------------------------------------------------------------- *
+ *   
+ * linux/fs/autofs/autofs_i.h
+ *
+ *   Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/* Internal header file for autofs */
+
+#include <linux/auto_fs4.h>
+#include <linux/list.h>
+
+/* This is the range of ioctl() numbers we claim as ours */
+#define AUTOFS_IOC_FIRST     AUTOFS_IOC_READY
+#define AUTOFS_IOC_COUNT     32
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <asm/current.h>
+#include <asm/uaccess.h>
+
+/* #define DEBUG */
+
+#ifdef DEBUG
+#define DPRINTK(fmt,args...) do { printk(KERN_DEBUG "pid %d: %s: " fmt "\n" , current->pid , __FUNCTION__ , ##args); } while(0)
+#else
+#define DPRINTK(fmt,args...) do {} while(0)
+#endif
+
+#define AUTOFS_SUPER_MAGIC 0x0187
+
+/*
+ * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
+ * kernel will keep the negative response cached for up to the time given
+ * here, although the time can be shorter if the kernel throws the dcache
+ * entry away.  This probably should be settable from user space.
+ */
+#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ)	/* 1 minute */
+
+/* Unified info structure.  This is pointed to by both the dentry and
+   inode structures.  Each file in the filesystem has an instance of this
+   structure.  It holds a reference to the dentry, so dentries are never
+   flushed while the file exists.  All name lookups are dealt with at the
+   dentry level, although the filesystem can interfere in the validation
+   process.  Readdir is implemented by traversing the dentry lists. */
+struct autofs_info {
+	struct dentry	*dentry;
+	struct inode	*inode;
+
+	int		flags;
+
+	struct autofs_sb_info *sbi;
+	unsigned long last_used;
+
+	mode_t	mode;
+	size_t	size;
+
+	void (*free)(struct autofs_info *);
+	union {
+		const char *symlink;
+	} u;
+};
+
+#define AUTOFS_INF_EXPIRING	(1<<0) /* dentry is in the process of expiring */
+
+struct autofs_wait_queue {
+	wait_queue_head_t queue;
+	struct autofs_wait_queue *next;
+	autofs_wqt_t wait_queue_token;
+	/* We use the following to see what we are waiting for */
+	int hash;
+	int len;
+	char *name;
+	/* This is for status reporting upon return */
+	int status;
+	atomic_t wait_ctr;
+};
+
+#define AUTOFS_SBI_MAGIC 0x6d4a556d
+
+struct autofs_sb_info {
+	u32 magic;
+	struct file *pipe;
+	pid_t oz_pgrp;
+	int catatonic;
+	int version;
+	int sub_version;
+	unsigned long exp_timeout;
+	int reghost_enabled;
+	int needs_reghost;
+	struct super_block *sb;
+	struct semaphore wq_sem;
+	struct autofs_wait_queue *queues; /* Wait queue pointer */
+};
+
+static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
+{
+	return (struct autofs_sb_info *)(sb->s_fs_info);
+}
+
+static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
+{
+	return (struct autofs_info *)(dentry->d_fsdata);
+}
+
+/* autofs4_oz_mode(): do we see the man behind the curtain?  (The
+   processes which do manipulations for us in user space sees the raw
+   filesystem without "magic".) */
+
+static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
+	return sbi->catatonic || process_group(current) == sbi->oz_pgrp;
+}
+
+/* Does a dentry have some pending activity? */
+static inline int autofs4_ispending(struct dentry *dentry)
+{
+	struct autofs_info *inf = autofs4_dentry_ino(dentry);
+
+	return (dentry->d_flags & DCACHE_AUTOFS_PENDING) ||
+		(inf != NULL && inf->flags & AUTOFS_INF_EXPIRING);
+}
+
+static inline void autofs4_copy_atime(struct file *src, struct file *dst)
+{
+	dst->f_dentry->d_inode->i_atime = src->f_dentry->d_inode->i_atime;
+	return;
+}
+
+struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *);
+void autofs4_free_ino(struct autofs_info *);
+
+/* Expiration */
+int is_autofs4_dentry(struct dentry *);
+int autofs4_expire_run(struct super_block *, struct vfsmount *,
+			struct autofs_sb_info *,
+			struct autofs_packet_expire __user *);
+int autofs4_expire_multi(struct super_block *, struct vfsmount *,
+			struct autofs_sb_info *, int __user *);
+
+/* Operations structures */
+
+extern struct inode_operations autofs4_symlink_inode_operations;
+extern struct inode_operations autofs4_dir_inode_operations;
+extern struct inode_operations autofs4_root_inode_operations;
+extern struct file_operations autofs4_dir_operations;
+extern struct file_operations autofs4_root_operations;
+
+/* Initializing function */
+
+int autofs4_fill_super(struct super_block *, void *, int);
+struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info *sbi, mode_t mode);
+
+/* Queue management functions */
+
+enum autofs_notify
+{
+	NFY_NONE,
+	NFY_MOUNT,
+	NFY_EXPIRE
+};
+
+int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
+int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
+void autofs4_catatonic_mode(struct autofs_sb_info *);
+
+static inline int simple_positive(struct dentry *dentry)
+{
+	return dentry->d_inode && !d_unhashed(dentry);
+}
+
+static inline int simple_empty_nolock(struct dentry *dentry)
+{
+	struct dentry *child;
+	int ret = 0;
+
+	list_for_each_entry(child, &dentry->d_subdirs, d_child)
+		if (simple_positive(child))
+			goto out;
+	ret = 1;
+out:
+	return ret;
+}
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
new file mode 100644
index 00000000000..31540a6404d
--- /dev/null
+++ b/fs/autofs4/expire.c
@@ -0,0 +1,358 @@
+/* -*- c -*- --------------------------------------------------------------- *
+ *
+ * linux/fs/autofs/expire.c
+ *
+ *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ *  Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
+ *  Copyright 2001-2003 Ian Kent <raven@themaw.net>
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * ------------------------------------------------------------------------- */
+
+#include "autofs_i.h"
+
+static unsigned long now;
+
+/* Check if a dentry can be expired return 1 if it can else return 0 */
+static inline int autofs4_can_expire(struct dentry *dentry,
+					unsigned long timeout, int do_now)
+{
+	struct autofs_info *ino = autofs4_dentry_ino(dentry);
+
+	/* dentry in the process of being deleted */
+	if (ino == NULL)
+		return 0;
+
+	/* No point expiring a pending mount */
+	if (dentry->d_flags & DCACHE_AUTOFS_PENDING)
+		return 0;
+
+	if (!do_now) {
+		/* Too young to die */
+		if (time_after(ino->last_used + timeout, now))
+			return 0;
+
+		/* update last_used here :-
+		   - obviously makes sense if it is in use now
+		   - less obviously, prevents rapid-fire expire
+		     attempts if expire fails the first time */
+		ino->last_used = now;
+	}
+
+	return 1;
+}
+
+/* Check a mount point for busyness return 1 if not busy, otherwise */
+static int autofs4_check_mount(struct vfsmount *mnt, struct dentry *dentry)
+{
+	int status = 0;
+
+	DPRINTK("dentry %p %.*s",
+		dentry, (int)dentry->d_name.len, dentry->d_name.name);
+
+	mntget(mnt);
+	dget(dentry);
+
+	if (!follow_down(&mnt, &dentry))
+		goto done;
+
+	while (d_mountpoint(dentry) && follow_down(&mnt, &dentry))
+		;
+
+	/* This is an autofs submount, we can't expire it */
+	if (is_autofs4_dentry(dentry))
+		goto done;
+
+	/* The big question */
+	if (may_umount_tree(mnt) == 0)
+		status = 1;
+done:
+	DPRINTK("returning = %d", status);
+	mntput(mnt);
+	dput(dentry);
+	return status;
+}
+
+/* Check a directory tree of mount points for busyness
+ * The tree is not busy iff no mountpoints are busy
+ * Return 1 if the tree is busy or 0 otherwise
+ */
+static int autofs4_check_tree(struct vfsmount *mnt,
+	       		      struct dentry *top,
+			      unsigned long timeout,
+			      int do_now)
+{
+	struct dentry *this_parent = top;
+	struct list_head *next;
+
+	DPRINTK("parent %p %.*s",
+		top, (int)top->d_name.len, top->d_name.name);
+
+	/* Negative dentry - give up */
+	if (!simple_positive(top))
+		return 0;
+
+	/* Timeout of a tree mount is determined by its top dentry */
+	if (!autofs4_can_expire(top, timeout, do_now))
+		return 0;
+
+	spin_lock(&dcache_lock);
+repeat:
+	next = this_parent->d_subdirs.next;
+resume:
+	while (next != &this_parent->d_subdirs) {
+		struct dentry *dentry = list_entry(next, struct dentry, d_child);
+
+		/* Negative dentry - give up */
+		if (!simple_positive(dentry)) {
+			next = next->next;
+			continue;
+		}
+
+		DPRINTK("dentry %p %.*s",
+			dentry, (int)dentry->d_name.len, dentry->d_name.name);
+
+		if (!simple_empty_nolock(dentry)) {
+			this_parent = dentry;
+			goto repeat;
+		}
+
+		dentry = dget(dentry);
+		spin_unlock(&dcache_lock);
+
+		if (d_mountpoint(dentry)) {
+			/* First busy => tree busy */
+			if (!autofs4_check_mount(mnt, dentry)) {
+				dput(dentry);
+				return 0;
+			}
+		}
+
+		dput(dentry);
+		spin_lock(&dcache_lock);
+		next = next->next;
+	}
+
+	if (this_parent != top) {
+		next = this_parent->d_child.next;
+		this_parent = this_parent->d_parent;
+		goto resume;
+	}
+	spin_unlock(&dcache_lock);
+
+	return 1;
+}
+
+static struct dentry *autofs4_check_leaves(struct vfsmount *mnt,
+					   struct dentry *parent,
+					   unsigned long timeout,
+					   int do_now)
+{
+	struct dentry *this_parent = parent;
+	struct list_head *next;
+
+	DPRINTK("parent %p %.*s",
+		parent, (int)parent->d_name.len, parent->d_name.name);
+
+	spin_lock(&dcache_lock);
+repeat:
+	next = this_parent->d_subdirs.next;
+resume:
+	while (next != &this_parent->d_subdirs) {
+		struct dentry *dentry = list_entry(next, struct dentry, d_child);
+
+		/* Negative dentry - give up */
+		if (!simple_positive(dentry)) {
+			next = next->next;
+			continue;
+		}
+
+		DPRINTK("dentry %p %.*s",
+			dentry, (int)dentry->d_name.len, dentry->d_name.name);
+
+		if (!list_empty(&dentry->d_subdirs)) {
+			this_parent = dentry;
+			goto repeat;
+		}
+
+		dentry = dget(dentry);
+		spin_unlock(&dcache_lock);
+
+		if (d_mountpoint(dentry)) {
+			/* Can we expire this guy */
+			if (!autofs4_can_expire(dentry, timeout, do_now))
+				goto cont;
+
+			/* Can we umount this guy */
+			if (autofs4_check_mount(mnt, dentry))
+				return dentry;
+
+		}
+cont:
+		dput(dentry);
+		spin_lock(&dcache_lock);
+		next = next->next;
+	}
+
+	if (this_parent != parent) {
+		next = this_parent->d_child.next;
+		this_parent = this_parent->d_parent;
+		goto resume;
+	}
+	spin_unlock(&dcache_lock);
+
+	return NULL;
+}
+
+/*
+ * Find an eligible tree to time-out
+ * A tree is eligible if :-
+ *  - it is unused by any user process
+ *  - it has been unused for exp_timeout time
+ */
+static struct dentry *autofs4_expire(struct super_block *sb,
+				     struct vfsmount *mnt,
+				     struct autofs_sb_info *sbi,
+				     int how)
+{
+	unsigned long timeout;
+	struct dentry *root = sb->s_root;
+	struct dentry *expired = NULL;
+	struct list_head *next;
+	int do_now = how & AUTOFS_EXP_IMMEDIATE;
+	int exp_leaves = how & AUTOFS_EXP_LEAVES;
+
+	if ( !sbi->exp_timeout || !root )
+		return NULL;
+
+	now = jiffies;
+	timeout = sbi->exp_timeout;
+
+	spin_lock(&dcache_lock);
+	next = root->d_subdirs.next;
+
+	/* On exit from the loop expire is set to a dgot dentry
+	 * to expire or it's NULL */
+	while ( next != &root->d_subdirs ) {
+		struct dentry *dentry = list_entry(next, struct dentry, d_child);
+
+		/* Negative dentry - give up */
+		if ( !simple_positive(dentry) ) {
+			next = next->next;
+			continue;
+		}
+
+		dentry = dget(dentry);
+		spin_unlock(&dcache_lock);
+
+		/* Case 1: indirect mount or top level direct mount */
+		if (d_mountpoint(dentry)) {
+			DPRINTK("checking mountpoint %p %.*s",
+				dentry, (int)dentry->d_name.len, dentry->d_name.name);
+
+			/* Can we expire this guy */
+			if (!autofs4_can_expire(dentry, timeout, do_now))
+				goto next;
+
+			/* Can we umount this guy */
+			if (autofs4_check_mount(mnt, dentry)) {
+				expired = dentry;
+				break;
+			}
+			goto next;
+		}
+
+		if ( simple_empty(dentry) )
+			goto next;
+
+		/* Case 2: tree mount, expire iff entire tree is not busy */
+		if (!exp_leaves) {
+			if (autofs4_check_tree(mnt, dentry, timeout, do_now)) {
+			expired = dentry;
+			break;
+			}
+		/* Case 3: direct mount, expire individual leaves */
+		} else {
+			expired = autofs4_check_leaves(mnt, dentry, timeout, do_now);
+			if (expired) {
+				dput(dentry);
+				break;
+			}
+		}
+next:
+		dput(dentry);
+		spin_lock(&dcache_lock);
+		next = next->next;
+	}
+
+	if ( expired ) {
+		DPRINTK("returning %p %.*s",
+			expired, (int)expired->d_name.len, expired->d_name.name);
+		spin_lock(&dcache_lock);
+		list_del(&expired->d_parent->d_subdirs);
+		list_add(&expired->d_parent->d_subdirs, &expired->d_child);
+		spin_unlock(&dcache_lock);
+		return expired;
+	}
+	spin_unlock(&dcache_lock);
+
+	return NULL;
+}
+
+/* Perform an expiry operation */
+int autofs4_expire_run(struct super_block *sb,
+		      struct vfsmount *mnt,
+		      struct autofs_sb_info *sbi,
+		      struct autofs_packet_expire __user *pkt_p)
+{
+	struct autofs_packet_expire pkt;
+	struct dentry *dentry;
+
+	memset(&pkt,0,sizeof pkt);
+
+	pkt.hdr.proto_version = sbi->version;
+	pkt.hdr.type = autofs_ptype_expire;
+
+	if ((dentry = autofs4_expire(sb, mnt, sbi, 0)) == NULL)
+		return -EAGAIN;
+
+	pkt.len = dentry->d_name.len;
+	memcpy(pkt.name, dentry->d_name.name, pkt.len);
+	pkt.name[pkt.len] = '\0';
+	dput(dentry);
+
+	if ( copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)) )
+		return -EFAULT;
+
+	return 0;
+}
+
+/* Call repeatedly until it returns -EAGAIN, meaning there's nothing
+   more to be done */
+int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt,
+			struct autofs_sb_info *sbi, int __user *arg)
+{
+	struct dentry *dentry;
+	int ret = -EAGAIN;
+	int do_now = 0;
+
+	if (arg && get_user(do_now, arg))
+		return -EFAULT;
+
+	if ((dentry = autofs4_expire(sb, mnt, sbi, do_now)) != NULL) {
+		struct autofs_info *de_info = autofs4_dentry_ino(dentry);
+
+		/* This is synchronous because it makes the daemon a
+                   little easier */
+		de_info->flags |= AUTOFS_INF_EXPIRING;
+		ret = autofs4_wait(sbi, dentry, NFY_EXPIRE);
+		de_info->flags &= ~AUTOFS_INF_EXPIRING;
+		dput(dentry);
+	}
+		
+	return ret;
+}
+
diff --git a/fs/autofs4/init.c b/fs/autofs4/init.c
new file mode 100644
index 00000000000..acecec8578c
--- /dev/null
+++ b/fs/autofs4/init.c
@@ -0,0 +1,42 @@
+/* -*- c -*- --------------------------------------------------------------- *
+ *
+ * linux/fs/autofs/init.c
+ *
+ *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * ------------------------------------------------------------------------- */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include "autofs_i.h"
+
+static struct super_block *autofs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_nodev(fs_type, flags, data, autofs4_fill_super);
+}
+
+static struct file_system_type autofs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "autofs",
+	.get_sb		= autofs_get_sb,
+	.kill_sb	= kill_anon_super,
+};
+
+static int __init init_autofs4_fs(void)
+{
+	return register_filesystem(&autofs_fs_type);
+}
+
+static void __exit exit_autofs4_fs(void)
+{
+	unregister_filesystem(&autofs_fs_type);
+}
+
+module_init(init_autofs4_fs) 
+module_exit(exit_autofs4_fs)
+MODULE_LICENSE("GPL");
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
new file mode 100644
index 00000000000..a5256074662
--- /dev/null
+++ b/fs/autofs4/inode.c
@@ -0,0 +1,324 @@
+/* -*- c -*- --------------------------------------------------------------- *
+ *
+ * linux/fs/autofs/inode.c
+ *
+ *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * ------------------------------------------------------------------------- */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/pagemap.h>
+#include <linux/parser.h>
+#include <linux/bitops.h>
+#include "autofs_i.h"
+#include <linux/module.h>
+
+static void ino_lnkfree(struct autofs_info *ino)
+{
+	if (ino->u.symlink) {
+		kfree(ino->u.symlink);
+		ino->u.symlink = NULL;
+	}
+}
+
+struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
+				     struct autofs_sb_info *sbi, mode_t mode)
+{
+	int reinit = 1;
+
+	if (ino == NULL) {
+		reinit = 0;
+		ino = kmalloc(sizeof(*ino), GFP_KERNEL);
+	}
+
+	if (ino == NULL)
+		return NULL;
+
+	ino->flags = 0;
+	ino->mode = mode;
+	ino->inode = NULL;
+	ino->dentry = NULL;
+	ino->size = 0;
+
+	ino->last_used = jiffies;
+
+	ino->sbi = sbi;
+
+	if (reinit && ino->free)
+		(ino->free)(ino);
+
+	memset(&ino->u, 0, sizeof(ino->u));
+
+	ino->free = NULL;
+
+	if (S_ISLNK(mode))
+		ino->free = ino_lnkfree;
+
+	return ino;
+}
+
+void autofs4_free_ino(struct autofs_info *ino)
+{
+	if (ino->dentry) {
+		ino->dentry->d_fsdata = NULL;
+		if (ino->dentry->d_inode)
+			dput(ino->dentry);
+		ino->dentry = NULL;
+	}
+	if (ino->free)
+		(ino->free)(ino);
+	kfree(ino);
+}
+
+static void autofs4_put_super(struct super_block *sb)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(sb);
+
+	sb->s_fs_info = NULL;
+
+	if ( !sbi->catatonic )
+		autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
+
+	kfree(sbi);
+
+	DPRINTK("shutting down");
+}
+
+static struct super_operations autofs4_sops = {
+	.put_super	= autofs4_put_super,
+	.statfs		= simple_statfs,
+};
+
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+
+static match_table_t tokens = {
+	{Opt_fd, "fd=%u"},
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_pgrp, "pgrp=%u"},
+	{Opt_minproto, "minproto=%u"},
+	{Opt_maxproto, "maxproto=%u"},
+	{Opt_err, NULL}
+};
+
+static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
+			 pid_t *pgrp, int *minproto, int *maxproto)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
+
+	*uid = current->uid;
+	*gid = current->gid;
+	*pgrp = process_group(current);
+
+	*minproto = AUTOFS_MIN_PROTO_VERSION;
+	*maxproto = AUTOFS_MAX_PROTO_VERSION;
+
+	*pipefd = -1;
+
+	if (!options)
+		return 1;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_fd:
+			if (match_int(args, pipefd))
+				return 1;
+			break;
+		case Opt_uid:
+			if (match_int(args, &option))
+				return 1;
+			*uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
+				return 1;
+			*gid = option;
+			break;
+		case Opt_pgrp:
+			if (match_int(args, &option))
+				return 1;
+			*pgrp = option;
+			break;
+		case Opt_minproto:
+			if (match_int(args, &option))
+				return 1;
+			*minproto = option;
+			break;
+		case Opt_maxproto:
+			if (match_int(args, &option))
+				return 1;
+			*maxproto = option;
+			break;
+		default:
+			return 1;
+		}
+	}
+	return (*pipefd < 0);
+}
+
+static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
+{
+	struct autofs_info *ino;
+
+	ino = autofs4_init_ino(NULL, sbi, S_IFDIR | 0755);
+	if (!ino)
+		return NULL;
+
+	return ino;
+}
+
+int autofs4_fill_super(struct super_block *s, void *data, int silent)
+{
+	struct inode * root_inode;
+	struct dentry * root;
+	struct file * pipe;
+	int pipefd;
+	struct autofs_sb_info *sbi;
+	struct autofs_info *ino;
+	int minproto, maxproto;
+
+	sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
+	if ( !sbi )
+		goto fail_unlock;
+	DPRINTK("starting up, sbi = %p",sbi);
+
+	memset(sbi, 0, sizeof(*sbi));
+
+	s->s_fs_info = sbi;
+	sbi->magic = AUTOFS_SBI_MAGIC;
+	sbi->catatonic = 0;
+	sbi->exp_timeout = 0;
+	sbi->oz_pgrp = process_group(current);
+	sbi->sb = s;
+	sbi->version = 0;
+	sbi->sub_version = 0;
+	init_MUTEX(&sbi->wq_sem);
+	sbi->queues = NULL;
+	s->s_blocksize = 1024;
+	s->s_blocksize_bits = 10;
+	s->s_magic = AUTOFS_SUPER_MAGIC;
+	s->s_op = &autofs4_sops;
+	s->s_time_gran = 1;
+
+	/*
+	 * Get the root inode and dentry, but defer checking for errors.
+	 */
+	ino = autofs4_mkroot(sbi);
+	if (!ino)
+		goto fail_free;
+	root_inode = autofs4_get_inode(s, ino);
+	kfree(ino);
+	if (!root_inode)
+		goto fail_free;
+
+	root_inode->i_op = &autofs4_root_inode_operations;
+	root_inode->i_fop = &autofs4_root_operations;
+	root = d_alloc_root(root_inode);
+	pipe = NULL;
+
+	if (!root)
+		goto fail_iput;
+
+	/* Can this call block? */
+	if (parse_options(data, &pipefd,
+			  &root_inode->i_uid, &root_inode->i_gid,
+			  &sbi->oz_pgrp,
+			  &minproto, &maxproto)) {
+		printk("autofs: called with bogus options\n");
+		goto fail_dput;
+	}
+
+	/* Couldn't this be tested earlier? */
+	if (maxproto < AUTOFS_MIN_PROTO_VERSION ||
+	    minproto > AUTOFS_MAX_PROTO_VERSION) {
+		printk("autofs: kernel does not match daemon version "
+		       "daemon (%d, %d) kernel (%d, %d)\n",
+			minproto, maxproto,
+			AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
+		goto fail_dput;
+	}
+
+	sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto;
+	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
+
+	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
+	pipe = fget(pipefd);
+	
+	if ( !pipe ) {
+		printk("autofs: could not open pipe file descriptor\n");
+		goto fail_dput;
+	}
+	if ( !pipe->f_op || !pipe->f_op->write )
+		goto fail_fput;
+	sbi->pipe = pipe;
+
+	/*
+	 * Success! Install the root dentry now to indicate completion.
+	 */
+	s->s_root = root;
+	return 0;
+	
+	/*
+	 * Failure ... clean up.
+	 */
+fail_fput:
+	printk("autofs: pipe file descriptor does not contain proper ops\n");
+	fput(pipe);
+	/* fall through */
+fail_dput:
+	dput(root);
+	goto fail_free;
+fail_iput:
+	printk("autofs: get root dentry failed\n");
+	iput(root_inode);
+fail_free:
+	kfree(sbi);
+fail_unlock:
+	return -EINVAL;
+}
+
+struct inode *autofs4_get_inode(struct super_block *sb,
+				struct autofs_info *inf)
+{
+	struct inode *inode = new_inode(sb);
+
+	if (inode == NULL)
+		return NULL;
+
+	inf->inode = inode;
+	inode->i_mode = inf->mode;
+	if (sb->s_root) {
+		inode->i_uid = sb->s_root->d_inode->i_uid;
+		inode->i_gid = sb->s_root->d_inode->i_gid;
+	} else {
+		inode->i_uid = 0;
+		inode->i_gid = 0;
+	}
+	inode->i_blksize = PAGE_CACHE_SIZE;
+	inode->i_blocks = 0;
+	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+	if (S_ISDIR(inf->mode)) {
+		inode->i_nlink = 2;
+		inode->i_op = &autofs4_dir_inode_operations;
+		inode->i_fop = &autofs4_dir_operations;
+	} else if (S_ISLNK(inf->mode)) {
+		inode->i_size = inf->size;
+		inode->i_op = &autofs4_symlink_inode_operations;
+	}
+
+	return inode;
+}
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
new file mode 100644
index 00000000000..3765c047f15
--- /dev/null
+++ b/fs/autofs4/root.c
@@ -0,0 +1,808 @@
+/* -*- c -*- --------------------------------------------------------------- *
+ *
+ * linux/fs/autofs/root.c
+ *
+ *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ *  Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
+ *  Copyright 2001-2003 Ian Kent <raven@themaw.net>
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * ------------------------------------------------------------------------- */
+
+#include <linux/errno.h>
+#include <linux/stat.h>
+#include <linux/param.h>
+#include <linux/time.h>
+#include <linux/smp_lock.h>
+#include "autofs_i.h"
+
+static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *);
+static int autofs4_dir_unlink(struct inode *,struct dentry *);
+static int autofs4_dir_rmdir(struct inode *,struct dentry *);
+static int autofs4_dir_mkdir(struct inode *,struct dentry *,int);
+static int autofs4_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
+static int autofs4_dir_open(struct inode *inode, struct file *file);
+static int autofs4_dir_close(struct inode *inode, struct file *file);
+static int autofs4_dir_readdir(struct file * filp, void * dirent, filldir_t filldir);
+static int autofs4_root_readdir(struct file * filp, void * dirent, filldir_t filldir);
+static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
+static int autofs4_dcache_readdir(struct file *, void *, filldir_t);
+
+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 = {
+	.open		= autofs4_dir_open,
+	.release	= autofs4_dir_close,
+	.read		= generic_read_dir,
+	.readdir	= autofs4_dir_readdir,
+};
+
+struct inode_operations autofs4_root_inode_operations = {
+	.lookup		= autofs4_lookup,
+	.unlink		= autofs4_dir_unlink,
+	.symlink	= autofs4_dir_symlink,
+	.mkdir		= autofs4_dir_mkdir,
+	.rmdir		= autofs4_dir_rmdir,
+};
+
+struct inode_operations autofs4_dir_inode_operations = {
+	.lookup		= autofs4_lookup,
+	.unlink		= autofs4_dir_unlink,
+	.symlink	= autofs4_dir_symlink,
+	.mkdir		= autofs4_dir_mkdir,
+	.rmdir		= autofs4_dir_rmdir,
+};
+
+static int autofs4_root_readdir(struct file *file, void *dirent,
+				filldir_t filldir)
+{
+	struct autofs_sb_info *sbi = autofs4_sbi(file->f_dentry->d_sb);
+	int oz_mode = autofs4_oz_mode(sbi);
+
+	DPRINTK("called, filp->f_pos = %lld", file->f_pos);
+
+	/*
+	 * Don't set reghost flag if:
+	 * 1) f_pos is larger than zero -- we've already been here.
+	 * 2) we haven't even enabled reghosting in the 1st place.
+	 * 3) this is the daemon doing a readdir
+	 */
+	if (oz_mode && file->f_pos == 0 && sbi->reghost_enabled)
+		sbi->needs_reghost = 1;
+
+	DPRINTK("needs_reghost = %d", sbi->needs_reghost);
+
+	return autofs4_dcache_readdir(file, dirent, filldir);
+}
+
+/* Update usage from here to top of tree, so that scan of
+   top-level directories will give a useful result */
+static void autofs4_update_usage(struct dentry *dentry)
+{
+	struct dentry *top = dentry->d_sb->s_root;
+
+	spin_lock(&dcache_lock);
+	for(; dentry != top; dentry = dentry->d_parent) {
+		struct autofs_info *ino = autofs4_dentry_ino(dentry);
+
+		if (ino) {
+			update_atime(dentry->d_inode);
+			ino->last_used = jiffies;
+		}
+	}
+	spin_unlock(&dcache_lock);
+}
+
+/*
+ * From 2.4 kernel readdir.c
+ */
+static int autofs4_dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+	int i;
+	struct dentry *dentry = filp->f_dentry;
+
+	i = filp->f_pos;
+	switch (i) {
+		case 0:
+			if (filldir(dirent, ".", 1, i, dentry->d_inode->i_ino, DT_DIR) < 0)
+				break;
+			i++;
+			filp->f_pos++;
+			/* fallthrough */
+		case 1:
+			if (filldir(dirent, "..", 2, i, dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
+				break;
+			i++;
+			filp->f_pos++;
+			/* fallthrough */
+		default: {
+			struct list_head *list;
+			int j = i-2;
+
+			spin_lock(&dcache_lock);
+			list = dentry->d_subdirs.next;
+
+			for (;;) {
+				if (list == &dentry->d_subdirs) {
+					spin_unlock(&dcache_lock);
+					return 0;
+				}
+				if (!j)
+					break;
+				j--;
+				list = list->next;
+			}
+
+			while(1) {
+				struct dentry *de = list_entry(list, struct dentry, d_child);
+
+				if (!d_unhashed(de) && de->d_inode) {
+					spin_unlock(&dcache_lock);
+					if (filldir(dirent, de->d_name.name, de->d_name.len, filp->f_pos, de->d_inode->i_ino, DT_UNKNOWN) < 0)
+						break;
+					spin_lock(&dcache_lock);
+				}
+				filp->f_pos++;
+				list = list->next;
+				if (list != &dentry->d_subdirs)
+					continue;
+				spin_unlock(&dcache_lock);
+				break;
+			}
+		}
+	}
+	return 0;
+}
+
+static int autofs4_dir_open(struct inode *inode, struct file *file)
+{
+	struct dentry *dentry = file->f_dentry;
+	struct vfsmount *mnt = file->f_vfsmnt;
+	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+	int status;
+
+	DPRINTK("file=%p dentry=%p %.*s",
+		file, dentry, dentry->d_name.len, dentry->d_name.name);
+
+	if (autofs4_oz_mode(sbi))
+		goto out;
+
+	if (autofs4_ispending(dentry)) {
+		DPRINTK("dentry busy");
+		return -EBUSY;
+	}
+
+	if (!d_mountpoint(dentry) && dentry->d_op && dentry->d_op->d_revalidate) {
+		struct nameidata nd;
+		int empty;
+
+		/* In ca