Release 4.10 fs/autofs4/autofs_i.h

/*
 *  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_fs4.h>
#include <linux/auto_dev-ioctl.h>
#include <linux/mutex.h>
#include <linux/spinlock.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


#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)

#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 <linux/uaccess.h>

#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 *autofs4_sbi(struct super_block *sb)
{
	return (struct autofs_sb_info *)(sb->s_fs_info);
}

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static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
{
	return (struct autofs_info *)(dentry->d_fsdata);
}

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/* 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 || task_pgrp(current) == sbi->oz_pgrp;
}

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struct inode *autofs4_get_inode(struct super_block *, umode_t);
void autofs4_free_ino(struct autofs_info *);

/* Expiration */
int is_autofs4_dentry(struct dentry *);
int autofs4_expire_wait(const struct path *path, int rcu_walk);
int autofs4_expire_run(struct super_block *, struct vfsmount *,
		       struct autofs_sb_info *,
		       struct autofs_packet_expire __user *);
int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
			    struct autofs_sb_info *sbi, int when);
int autofs4_expire_multi(struct super_block *, struct vfsmount *,
			 struct autofs_sb_info *, int __user *);
struct dentry *autofs4_expire_direct(struct super_block *sb,
				     struct vfsmount *mnt,
				     struct autofs_sb_info *sbi, int how);
struct dentry *autofs4_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 autofs4_symlink_inode_operations;
extern const struct inode_operations autofs4_dir_inode_operations;
extern const struct file_operations autofs4_dir_operations;
extern const struct file_operations autofs4_root_operations;
extern const struct dentry_operations autofs4_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);
}

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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);
}

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static inline void __managed_dentry_clear_managed(struct dentry *dentry)
{
	dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
}

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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);
}

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/* Initializing function */

int autofs4_fill_super(struct super_block *, void *, int);
struct autofs_info *autofs4_new_ino(struct autofs_sb_info *);
void autofs4_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;
}

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/* Queue management functions */

int autofs4_wait(struct autofs_sb_info *,
		 const struct path *, 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 u32 autofs4_get_dev(struct autofs_sb_info *sbi)
{
	return new_encode_dev(sbi->sb->s_dev);
}

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static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
{
	return d_inode(sbi->sb->s_root)->i_ino;
}

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static inline void __autofs4_add_expiring(struct dentry *dentry)
{
	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs4_dentry_ino(dentry);

	if (ino) {
		if (list_empty(&ino->expiring))
			list_add(&ino->expiring, &sbi->expiring_list);
	}
}

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static inline void autofs4_add_expiring(struct dentry *dentry)
{
	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs4_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);
	}
}

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static inline void autofs4_del_expiring(struct dentry *dentry)
{
	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs4_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);
	}
}

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void autofs4_kill_sb(struct super_block *);
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Directory: fs/autofs4

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