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Commit 85471904 authored by Ian Kent's avatar Ian Kent Committed by Linus Torvalds
Browse files

autofs: delete fs/autofs4 source files

Delete the now unused autofs4 module files.

Link: http://lkml.kernel.org/r/152626707391.28589.3553309771262313504.stgit@pluto.themaw.net


Signed-off-by: default avatarIan Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f7e095f5
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fs/autofs4/autofs_i.h

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Original line number Diff line number Diff line
/*
 *  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 *);

fs/autofs4/dev-ioctl.c

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File deleted.

Preview size limit exceeded, changes collapsed.

fs/autofs4/expire.c

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Original line number Diff line number Diff line
/*
 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
 * Copyright 2001-2006 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.
 */

#include "autofs_i.h"

static unsigned long now;

/* Check if a dentry can be expired */
static inline int autofs_can_expire(struct dentry *dentry,
				    unsigned long timeout, int do_now)
{
	struct autofs_info *ino = autofs_dentry_ino(dentry);

	/* dentry in the process of being deleted */
	if (ino == NULL)
		return 0;

	if (!do_now) {
		/* Too young to die */
		if (!timeout || time_after(ino->last_used + timeout, now))
			return 0;
	}
	return 1;
}

/* Check a mount point for busyness */
static int autofs_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
{
	struct dentry *top = dentry;
	struct path path = {.mnt = mnt, .dentry = dentry};
	int status = 1;

	pr_debug("dentry %p %pd\n", dentry, dentry);

	path_get(&path);

	if (!follow_down_one(&path))
		goto done;

	if (is_autofs_dentry(path.dentry)) {
		struct autofs_sb_info *sbi = autofs_sbi(path.dentry->d_sb);

		/* This is an autofs submount, we can't expire it */
		if (autofs_type_indirect(sbi->type))
			goto done;
	}

	/* Update the expiry counter if fs is busy */
	if (!may_umount_tree(path.mnt)) {
		struct autofs_info *ino;

		ino = autofs_dentry_ino(top);
		ino->last_used = jiffies;
		goto done;
	}

	status = 0;
done:
	pr_debug("returning = %d\n", status);
	path_put(&path);
	return status;
}

/*
 * Calculate and dget next entry in the subdirs list under root.
 */
static struct dentry *get_next_positive_subdir(struct dentry *prev,
					       struct dentry *root)
{
	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
	struct list_head *next;
	struct dentry *q;

	spin_lock(&sbi->lookup_lock);
	spin_lock(&root->d_lock);

	if (prev)
		next = prev->d_child.next;
	else {
		prev = dget_dlock(root);
		next = prev->d_subdirs.next;
	}

cont:
	if (next == &root->d_subdirs) {
		spin_unlock(&root->d_lock);
		spin_unlock(&sbi->lookup_lock);
		dput(prev);
		return NULL;
	}

	q = list_entry(next, struct dentry, d_child);

	spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED);
	/* Already gone or negative dentry (under construction) - try next */
	if (!d_count(q) || !simple_positive(q)) {
		spin_unlock(&q->d_lock);
		next = q->d_child.next;
		goto cont;
	}
	dget_dlock(q);
	spin_unlock(&q->d_lock);
	spin_unlock(&root->d_lock);
	spin_unlock(&sbi->lookup_lock);

	dput(prev);

	return q;
}

/*
 * Calculate and dget next entry in top down tree traversal.
 */
static struct dentry *get_next_positive_dentry(struct dentry *prev,
					       struct dentry *root)
{
	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
	struct list_head *next;
	struct dentry *p, *ret;

	if (prev == NULL)
		return dget(root);

	spin_lock(&sbi->lookup_lock);
relock:
	p = prev;
	spin_lock(&p->d_lock);
again:
	next = p->d_subdirs.next;
	if (next == &p->d_subdirs) {
		while (1) {
			struct dentry *parent;

			if (p == root) {
				spin_unlock(&p->d_lock);
				spin_unlock(&sbi->lookup_lock);
				dput(prev);
				return NULL;
			}

			parent = p->d_parent;
			if (!spin_trylock(&parent->d_lock)) {
				spin_unlock(&p->d_lock);
				cpu_relax();
				goto relock;
			}
			spin_unlock(&p->d_lock);
			next = p->d_child.next;
			p = parent;
			if (next != &parent->d_subdirs)
				break;
		}
	}
	ret = list_entry(next, struct dentry, d_child);

	spin_lock_nested(&ret->d_lock, DENTRY_D_LOCK_NESTED);
	/* Negative dentry - try next */
	if (!simple_positive(ret)) {
		spin_unlock(&p->d_lock);
		lock_set_subclass(&ret->d_lock.dep_map, 0, _RET_IP_);
		p = ret;
		goto again;
	}
	dget_dlock(ret);
	spin_unlock(&ret->d_lock);
	spin_unlock(&p->d_lock);
	spin_unlock(&sbi->lookup_lock);

	dput(prev);

	return ret;
}

/*
 * Check a direct mount point for busyness.
 * Direct mounts have similar expiry semantics to tree mounts.
 * The tree is not busy iff no mountpoints are busy and there are no
 * autofs submounts.
 */
static int autofs_direct_busy(struct vfsmount *mnt,
			      struct dentry *top,
			      unsigned long timeout,
			      int do_now)
{
	pr_debug("top %p %pd\n", top, top);

	/* If it's busy update the expiry counters */
	if (!may_umount_tree(mnt)) {
		struct autofs_info *ino;

		ino = autofs_dentry_ino(top);
		if (ino)
			ino->last_used = jiffies;
		return 1;
	}

	/* Timeout of a direct mount is determined by its top dentry */
	if (!autofs_can_expire(top, timeout, do_now))
		return 1;

	return 0;
}

/*
 * Check a directory tree of mount points for busyness
 * The tree is not busy iff no mountpoints are busy
 */
static int autofs_tree_busy(struct vfsmount *mnt,
			    struct dentry *top,
			    unsigned long timeout,
			    int do_now)
{
	struct autofs_info *top_ino = autofs_dentry_ino(top);
	struct dentry *p;

	pr_debug("top %p %pd\n", top, top);

	/* Negative dentry - give up */
	if (!simple_positive(top))
		return 1;

	p = NULL;
	while ((p = get_next_positive_dentry(p, top))) {
		pr_debug("dentry %p %pd\n", p, p);

		/*
		 * Is someone visiting anywhere in the subtree ?
		 * If there's no mount we need to check the usage
		 * count for the autofs dentry.
		 * If the fs is busy update the expiry counter.
		 */
		if (d_mountpoint(p)) {
			if (autofs_mount_busy(mnt, p)) {
				top_ino->last_used = jiffies;
				dput(p);
				return 1;
			}
		} else {
			struct autofs_info *ino = autofs_dentry_ino(p);
			unsigned int ino_count = atomic_read(&ino->count);

			/* allow for dget above and top is already dgot */
			if (p == top)
				ino_count += 2;
			else
				ino_count++;

			if (d_count(p) > ino_count) {
				top_ino->last_used = jiffies;
				dput(p);
				return 1;
			}
		}
	}

	/* Timeout of a tree mount is ultimately determined by its top dentry */
	if (!autofs_can_expire(top, timeout, do_now))
		return 1;

	return 0;
}

static struct dentry *autofs_check_leaves(struct vfsmount *mnt,
					  struct dentry *parent,
					  unsigned long timeout,
					  int do_now)
{
	struct dentry *p;

	pr_debug("parent %p %pd\n", parent, parent);

	p = NULL;
	while ((p = get_next_positive_dentry(p, parent))) {
		pr_debug("dentry %p %pd\n", p, p);

		if (d_mountpoint(p)) {
			/* Can we umount this guy */
			if (autofs_mount_busy(mnt, p))
				continue;

			/* Can we expire this guy */
			if (autofs_can_expire(p, timeout, do_now))
				return p;
		}
	}
	return NULL;
}

/* Check if we can expire a direct mount (possibly a tree) */
struct dentry *autofs_expire_direct(struct super_block *sb,
				    struct vfsmount *mnt,
				    struct autofs_sb_info *sbi,
				    int how)
{
	unsigned long timeout;
	struct dentry *root = dget(sb->s_root);
	int do_now = how & AUTOFS_EXP_IMMEDIATE;
	struct autofs_info *ino;

	if (!root)
		return NULL;

	now = jiffies;
	timeout = sbi->exp_timeout;

	if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
		spin_lock(&sbi->fs_lock);
		ino = autofs_dentry_ino(root);
		/* No point expiring a pending mount */
		if (ino->flags & AUTOFS_INF_PENDING) {
			spin_unlock(&sbi->fs_lock);
			goto out;
		}
		ino->flags |= AUTOFS_INF_WANT_EXPIRE;
		spin_unlock(&sbi->fs_lock);
		synchronize_rcu();
		if (!autofs_direct_busy(mnt, root, timeout, do_now)) {
			spin_lock(&sbi->fs_lock);
			ino->flags |= AUTOFS_INF_EXPIRING;
			init_completion(&ino->expire_complete);
			spin_unlock(&sbi->fs_lock);
			return root;
		}
		spin_lock(&sbi->fs_lock);
		ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
		spin_unlock(&sbi->fs_lock);
	}
out:
	dput(root);

	return NULL;
}

/* Check if 'dentry' should expire, or return a nearby
 * dentry that is suitable.
 * If returned dentry is different from arg dentry,
 * then a dget() reference was taken, else not.
 */
static struct dentry *should_expire(struct dentry *dentry,
				    struct vfsmount *mnt,
				    unsigned long timeout,
				    int how)
{
	int do_now = how & AUTOFS_EXP_IMMEDIATE;
	int exp_leaves = how & AUTOFS_EXP_LEAVES;
	struct autofs_info *ino = autofs_dentry_ino(dentry);
	unsigned int ino_count;

	/* No point expiring a pending mount */
	if (ino->flags & AUTOFS_INF_PENDING)
		return NULL;

	/*
	 * Case 1: (i) indirect mount or top level pseudo direct mount
	 *	   (autofs-4.1).
	 *	   (ii) indirect mount with offset mount, check the "/"
	 *	   offset (autofs-5.0+).
	 */
	if (d_mountpoint(dentry)) {
		pr_debug("checking mountpoint %p %pd\n", dentry, dentry);

		/* Can we umount this guy */
		if (autofs_mount_busy(mnt, dentry))
			return NULL;

		/* Can we expire this guy */
		if (autofs_can_expire(dentry, timeout, do_now))
			return dentry;
		return NULL;
	}

	if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
		pr_debug("checking symlink %p %pd\n", dentry, dentry);
		/*
		 * A symlink can't be "busy" in the usual sense so
		 * just check last used for expire timeout.
		 */
		if (autofs_can_expire(dentry, timeout, do_now))
			return dentry;
		return NULL;
	}

	if (simple_empty(dentry))
		return NULL;

	/* Case 2: tree mount, expire iff entire tree is not busy */
	if (!exp_leaves) {
		/* Path walk currently on this dentry? */
		ino_count = atomic_read(&ino->count) + 1;
		if (d_count(dentry) > ino_count)
			return NULL;

		if (!autofs_tree_busy(mnt, dentry, timeout, do_now))
			return dentry;
	/*
	 * Case 3: pseudo direct mount, expire individual leaves
	 *	   (autofs-4.1).
	 */
	} else {
		/* Path walk currently on this dentry? */
		struct dentry *expired;

		ino_count = atomic_read(&ino->count) + 1;
		if (d_count(dentry) > ino_count)
			return NULL;

		expired = autofs_check_leaves(mnt, dentry, timeout, do_now);
		if (expired) {
			if (expired == dentry)
				dput(dentry);
			return expired;
		}
	}
	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
 */
struct dentry *autofs_expire_indirect(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 *dentry;
	struct dentry *expired;
	struct dentry *found;
	struct autofs_info *ino;

	if (!root)
		return NULL;

	now = jiffies;
	timeout = sbi->exp_timeout;

	dentry = NULL;
	while ((dentry = get_next_positive_subdir(dentry, root))) {
		int flags = how;

		spin_lock(&sbi->fs_lock);
		ino = autofs_dentry_ino(dentry);
		if (ino->flags & AUTOFS_INF_WANT_EXPIRE) {
			spin_unlock(&sbi->fs_lock);
			continue;
		}
		spin_unlock(&sbi->fs_lock);

		expired = should_expire(dentry, mnt, timeout, flags);
		if (!expired)
			continue;

		spin_lock(&sbi->fs_lock);
		ino = autofs_dentry_ino(expired);
		ino->flags |= AUTOFS_INF_WANT_EXPIRE;
		spin_unlock(&sbi->fs_lock);
		synchronize_rcu();

		/* Make sure a reference is not taken on found if
		 * things have changed.
		 */
		flags &= ~AUTOFS_EXP_LEAVES;
		found = should_expire(expired, mnt, timeout, how);
		if (!found || found != expired)
			/* Something has changed, continue */
			goto next;

		if (expired != dentry)
			dput(dentry);

		spin_lock(&sbi->fs_lock);
		goto found;
next:
		spin_lock(&sbi->fs_lock);
		ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
		spin_unlock(&sbi->fs_lock);
		if (expired != dentry)
			dput(expired);
	}
	return NULL;

found:
	pr_debug("returning %p %pd\n", expired, expired);
	ino->flags |= AUTOFS_INF_EXPIRING;
	init_completion(&ino->expire_complete);
	spin_unlock(&sbi->fs_lock);
	return expired;
}

int autofs_expire_wait(const struct path *path, int rcu_walk)
{
	struct dentry *dentry = path->dentry;
	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs_dentry_ino(dentry);
	int status;
	int state;

	/* Block on any pending expire */
	if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE))
		return 0;
	if (rcu_walk)
		return -ECHILD;

retry:
	spin_lock(&sbi->fs_lock);
	state = ino->flags & (AUTOFS_INF_WANT_EXPIRE | AUTOFS_INF_EXPIRING);
	if (state == AUTOFS_INF_WANT_EXPIRE) {
		spin_unlock(&sbi->fs_lock);
		/*
		 * Possibly being selected for expire, wait until
		 * it's selected or not.
		 */
		schedule_timeout_uninterruptible(HZ/10);
		goto retry;
	}
	if (state & AUTOFS_INF_EXPIRING) {
		spin_unlock(&sbi->fs_lock);

		pr_debug("waiting for expire %p name=%pd\n", dentry, dentry);

		status = autofs_wait(sbi, path, NFY_NONE);
		wait_for_completion(&ino->expire_complete);

		pr_debug("expire done status=%d\n", status);

		if (d_unhashed(dentry))
			return -EAGAIN;

		return status;
	}
	spin_unlock(&sbi->fs_lock);

	return 0;
}

/* Perform an expiry operation */
int autofs_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 autofs_info *ino;
	struct dentry *dentry;
	int ret = 0;

	memset(&pkt, 0, sizeof(pkt));

	pkt.hdr.proto_version = sbi->version;
	pkt.hdr.type = autofs_ptype_expire;

	dentry = autofs_expire_indirect(sb, mnt, sbi, 0);
	if (!dentry)
		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)))
		ret = -EFAULT;

	spin_lock(&sbi->fs_lock);
	ino = autofs_dentry_ino(dentry);
	/* avoid rapid-fire expire attempts if expiry fails */
	ino->last_used = now;
	ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
	complete_all(&ino->expire_complete);
	spin_unlock(&sbi->fs_lock);

	return ret;
}

int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
			   struct autofs_sb_info *sbi, int when)
{
	struct dentry *dentry;
	int ret = -EAGAIN;

	if (autofs_type_trigger(sbi->type))
		dentry = autofs_expire_direct(sb, mnt, sbi, when);
	else
		dentry = autofs_expire_indirect(sb, mnt, sbi, when);

	if (dentry) {
		struct autofs_info *ino = autofs_dentry_ino(dentry);
		const struct path path = { .mnt = mnt, .dentry = dentry };

		/* This is synchronous because it makes the daemon a
		 * little easier
		 */
		ret = autofs_wait(sbi, &path, NFY_EXPIRE);

		spin_lock(&sbi->fs_lock);
		/* avoid rapid-fire expire attempts if expiry fails */
		ino->last_used = now;
		ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
		complete_all(&ino->expire_complete);
		spin_unlock(&sbi->fs_lock);
		dput(dentry);
	}

	return ret;
}

/*
 * Call repeatedly until it returns -EAGAIN, meaning there's nothing
 * more to be done.
 */
int autofs_expire_multi(struct super_block *sb, struct vfsmount *mnt,
			struct autofs_sb_info *sbi, int __user *arg)
{
	int do_now = 0;

	if (arg && get_user(do_now, arg))
		return -EFAULT;

	return autofs_do_expire_multi(sb, mnt, sbi, do_now);
}

fs/autofs4/init.c

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+0 −48
Original line number Diff line number Diff line
/*
 * 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 dentry *autofs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_nodev(fs_type, flags, data, autofs_fill_super);
}

static struct file_system_type autofs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "autofs",
	.mount		= autofs_mount,
	.kill_sb	= autofs_kill_sb,
};
MODULE_ALIAS_FS("autofs");

static int __init init_autofs_fs(void)
{
	int err;

	autofs_dev_ioctl_init();

	err = register_filesystem(&autofs_fs_type);
	if (err)
		autofs_dev_ioctl_exit();

	return err;
}

static void __exit exit_autofs_fs(void)
{
	autofs_dev_ioctl_exit();
	unregister_filesystem(&autofs_fs_type);
}

module_init(init_autofs_fs)
module_exit(exit_autofs_fs)
MODULE_LICENSE("GPL");

fs/autofs4/inode.c

deleted100644 → 0
+0 −375

File deleted.

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