autofs: delete fs/autofs4 source files

/*

 *  Copyright 1997-1998 Transmeta Corporation - All Rights Reserved

 *  Copyright 2005-2006 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.

 */

/* Internal header file for autofs */

#include <linux/auto_fs.h>

#include <linux/auto_dev-ioctl.h>

#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 <linux/uaccess.h>

#include <linux/mutex.h>

#include <linux/spinlock.h>

#include <linux/list.h>

#include <linux/completion.h>

#include <asm/current.h>

/* This is the range of ioctl() numbers we claim as ours */

#define AUTOFS_IOC_FIRST     AUTOFS_IOC_READY

#define AUTOFS_IOC_COUNT     32

#define AUTOFS_DEV_IOCTL_IOC_FIRST	(AUTOFS_DEV_IOCTL_VERSION)

#define AUTOFS_DEV_IOCTL_IOC_COUNT \

	(AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD - AUTOFS_DEV_IOCTL_VERSION_CMD)

#ifdef pr_fmt

#undef pr_fmt

#endif

#define pr_fmt(fmt) KBUILD_MODNAME ":pid:%d:%s: " fmt, current->pid, __func__

/*

 * 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 completion expire_complete;

	struct list_head active;

	int active_count;

	struct list_head expiring;

	struct autofs_sb_info *sbi;

	unsigned long last_used;

	atomic_t count;

	kuid_t uid;

	kgid_t gid;

};

#define AUTOFS_INF_EXPIRING	(1<<0) /* dentry in the process of expiring */

#define AUTOFS_INF_WANT_EXPIRE	(1<<1) /* the dentry is being considered

					* for expiry, so RCU_walk is

					* not permitted.  If it progresses to

					* actual expiry attempt, the flag is

					* not cleared when EXPIRING is set -

					* in that case it gets cleared only

					* when it comes to clearing EXPIRING.

					*/

#define AUTOFS_INF_PENDING	(1<<2) /* dentry pending mount */

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 */

	struct qstr name;

	u32 dev;

	u64 ino;

	kuid_t uid;

	kgid_t gid;

	pid_t pid;

	pid_t tgid;

	/* This is for status reporting upon return */

	int status;

	unsigned int wait_ctr;

};

#define AUTOFS_SBI_MAGIC 0x6d4a556d

struct autofs_sb_info {

	u32 magic;

	int pipefd;

	struct file *pipe;

	struct pid *oz_pgrp;

	int catatonic;

	int version;

	int sub_version;

	int min_proto;

	int max_proto;

	unsigned long exp_timeout;

	unsigned int type;

	struct super_block *sb;

	struct mutex wq_mutex;

	struct mutex pipe_mutex;

	spinlock_t fs_lock;

	struct autofs_wait_queue *queues; /* Wait queue pointer */

	spinlock_t lookup_lock;

	struct list_head active_list;

	struct list_head expiring_list;

	struct rcu_head rcu;

};

static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)

{

	return (struct autofs_sb_info *)(sb->s_fs_info);

}

static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry)

{

	return (struct autofs_info *)(dentry->d_fsdata);

}

/* autofs_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 autofs_oz_mode(struct autofs_sb_info *sbi)

{

	return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp;

}

struct inode *autofs_get_inode(struct super_block *, umode_t);

void autofs_free_ino(struct autofs_info *);

/* Expiration */

int is_autofs_dentry(struct dentry *);

int autofs_expire_wait(const struct path *path, int rcu_walk);

int autofs_expire_run(struct super_block *, struct vfsmount *,

		      struct autofs_sb_info *,

		      struct autofs_packet_expire __user *);

int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,

			   struct autofs_sb_info *sbi, int when);

int autofs_expire_multi(struct super_block *, struct vfsmount *,

			struct autofs_sb_info *, int __user *);

struct dentry *autofs_expire_direct(struct super_block *sb,

				    struct vfsmount *mnt,

				    struct autofs_sb_info *sbi, int how);

struct dentry *autofs_expire_indirect(struct super_block *sb,

				      struct vfsmount *mnt,

				      struct autofs_sb_info *sbi, int how);

/* Device node initialization */

int autofs_dev_ioctl_init(void);

void autofs_dev_ioctl_exit(void);

/* Operations structures */

extern const struct inode_operations autofs_symlink_inode_operations;

extern const struct inode_operations autofs_dir_inode_operations;

extern const struct file_operations autofs_dir_operations;

extern const struct file_operations autofs_root_operations;

extern const struct dentry_operations autofs_dentry_operations;

/* VFS automount flags management functions */

static inline void __managed_dentry_set_managed(struct dentry *dentry)

{

	dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);

}

static inline void managed_dentry_set_managed(struct dentry *dentry)

{

	spin_lock(&dentry->d_lock);

	__managed_dentry_set_managed(dentry);

	spin_unlock(&dentry->d_lock);

}

static inline void __managed_dentry_clear_managed(struct dentry *dentry)

{

	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);

}

static inline void managed_dentry_clear_managed(struct dentry *dentry)

{

	spin_lock(&dentry->d_lock);

	__managed_dentry_clear_managed(dentry);

	spin_unlock(&dentry->d_lock);

}

/* Initializing function */

int autofs_fill_super(struct super_block *, void *, int);

struct autofs_info *autofs_new_ino(struct autofs_sb_info *);

void autofs_clean_ino(struct autofs_info *);

static inline int autofs_prepare_pipe(struct file *pipe)

{

	if (!(pipe->f_mode & FMODE_CAN_WRITE))

		return -EINVAL;

	if (!S_ISFIFO(file_inode(pipe)->i_mode))

		return -EINVAL;

	/* We want a packet pipe */

	pipe->f_flags |= O_DIRECT;

	return 0;

}

/* Queue management functions */

int autofs_wait(struct autofs_sb_info *,

		 const struct path *, enum autofs_notify);

int autofs_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);

void autofs_catatonic_mode(struct autofs_sb_info *);

static inline u32 autofs_get_dev(struct autofs_sb_info *sbi)

{

	return new_encode_dev(sbi->sb->s_dev);

}

static inline u64 autofs_get_ino(struct autofs_sb_info *sbi)

{

	return d_inode(sbi->sb->s_root)->i_ino;

}

static inline void __autofs_add_expiring(struct dentry *dentry)

{

	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);

	struct autofs_info *ino = autofs_dentry_ino(dentry);

	if (ino) {

		if (list_empty(&ino->expiring))

			list_add(&ino->expiring, &sbi->expiring_list);

	}

}

static inline void autofs_add_expiring(struct dentry *dentry)

{

	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);

	struct autofs_info *ino = autofs_dentry_ino(dentry);

	if (ino) {

		spin_lock(&sbi->lookup_lock);

		if (list_empty(&ino->expiring))

			list_add(&ino->expiring, &sbi->expiring_list);

		spin_unlock(&sbi->lookup_lock);

	}

}

static inline void autofs_del_expiring(struct dentry *dentry)

{

	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);

	struct autofs_info *ino = autofs_dentry_ino(dentry);

	if (ino) {

		spin_lock(&sbi->lookup_lock);

		if (!list_empty(&ino->expiring))

			list_del_init(&ino->expiring);

		spin_unlock(&sbi->lookup_lock);

	}

}

void autofs_kill_sb(struct super_block *);