[net-next-2.6.git] / fs / autofs4 / inode.c

/* -*- c -*- --------------------------------------------------------------- *
 *
 * linux/fs/autofs/inode.c
 *
 *  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.
 *
 * ------------------------------------------------------------------------- */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/parser.h>
#include <linux/bitops.h>
#include <linux/magic.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;

	if (!reinit) {
		ino->flags = 0;
		ino->inode = NULL;
		ino->dentry = NULL;
		ino->size = 0;
		INIT_LIST_HEAD(&ino->active);
		INIT_LIST_HEAD(&ino->expiring);
		atomic_set(&ino->count, 0);
	}

	ino->mode = mode;
	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)
{
	struct autofs_info *p_ino;

	if (ino->dentry) {
		ino->dentry->d_fsdata = NULL;
		if (ino->dentry->d_inode) {
			struct dentry *parent = ino->dentry->d_parent;
			if (atomic_dec_and_test(&ino->count)) {
				p_ino = autofs4_dentry_ino(parent);
				if (p_ino && parent != ino->dentry)
					atomic_dec(&p_ino->count);
			}
			dput(ino->dentry);
		}
		ino->dentry = NULL;
	}
	if (ino->free)
		(ino->free)(ino);
	kfree(ino);
}

/*
 * Deal with the infamous "Busy inodes after umount ..." message.
 *
 * Clean up the dentry tree. This happens with autofs if the user
 * space program goes away due to a SIGKILL, SIGSEGV etc.
 */
static void autofs4_force_release(struct autofs_sb_info *sbi)
{
	struct dentry *this_parent = sbi->sb->s_root;
	struct list_head *next;

	if (!sbi->sb->s_root)
		return;

	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_u.d_child);

		/* Negative dentry - don`t care */
		if (!simple_positive(dentry)) {
			next = next->next;
			continue;
		}

		if (!list_empty(&dentry->d_subdirs)) {
			this_parent = dentry;
			goto repeat;
		}

		next = next->next;
		spin_unlock(&dcache_lock);

		DPRINTK("dentry %p %.*s",
			dentry, (int)dentry->d_name.len, dentry->d_name.name);

		dput(dentry);
		spin_lock(&dcache_lock);
	}

	if (this_parent != sbi->sb->s_root) {
		struct dentry *dentry = this_parent;

		next = this_parent->d_u.d_child.next;
		this_parent = this_parent->d_parent;
		spin_unlock(&dcache_lock);
		DPRINTK("parent dentry %p %.*s",
			dentry, (int)dentry->d_name.len, dentry->d_name.name);
		dput(dentry);
		spin_lock(&dcache_lock);
		goto resume;
	}
	spin_unlock(&dcache_lock);
}

void autofs4_kill_sb(struct super_block *sb)
{
	struct autofs_sb_info *sbi = autofs4_sbi(sb);

	/*
	 * In the event of a failure in get_sb_nodev the superblock
	 * info is not present so nothing else has been setup, so
	 * just call kill_anon_super when we are called from
	 * deactivate_super.
	 */
	if (!sbi)
		goto out_kill_sb;

	/* Free wait queues, close pipe */
	autofs4_catatonic_mode(sbi);

	/* Clean up and release dangling references */
	autofs4_force_release(sbi);

	sb->s_fs_info = NULL;
	kfree(sbi);

out_kill_sb:
	DPRINTK("shutting down");
	kill_anon_super(sb);
}

static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
{
	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
	struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;

	if (!sbi)
		return 0;

	seq_printf(m, ",fd=%d", sbi->pipefd);
	if (root_inode->i_uid != 0)
		seq_printf(m, ",uid=%u", root_inode->i_uid);
	if (root_inode->i_gid != 0)
		seq_printf(m, ",gid=%u", root_inode->i_gid);
	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	seq_printf(m, ",minproto=%d", sbi->min_proto);
	seq_printf(m, ",maxproto=%d", sbi->max_proto);

	if (sbi->type & AUTOFS_TYPE_OFFSET)
		seq_printf(m, ",offset");
	else if (sbi->type & AUTOFS_TYPE_DIRECT)
		seq_printf(m, ",direct");
	else
		seq_printf(m, ",indirect");

	return 0;
}

static const struct super_operations autofs4_sops = {
	.statfs		= simple_statfs,
	.show_options	= autofs4_show_options,
};

enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
	Opt_indirect, Opt_direct, Opt_offset};

static const 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_indirect, "indirect"},
	{Opt_direct, "direct"},
	{Opt_offset, "offset"},
	{Opt_err, NULL}
};

static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
		pid_t *pgrp, unsigned int *type, int *minproto, int *maxproto)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;

	*uid = current->uid;
	*gid = current->gid;
	*pgrp = task_pgrp_nr(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;
		case Opt_indirect:
			*type = AUTOFS_TYPE_INDIRECT;
			break;
		case Opt_direct:
			*type = AUTOFS_TYPE_DIRECT;
			break;
		case Opt_offset:
			*type = AUTOFS_TYPE_DIRECT | AUTOFS_TYPE_OFFSET;
			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;
}

static struct dentry_operations autofs4_sb_dentry_operations = {
	.d_release      = autofs4_dentry_release,
};

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;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		goto fail_unlock;
	DPRINTK("starting up, sbi = %p",sbi);

	s->s_fs_info = sbi;
	sbi->magic = AUTOFS_SBI_MAGIC;
	sbi->pipefd = -1;
	sbi->pipe = NULL;
	sbi->catatonic = 1;
	sbi->exp_timeout = 0;
	sbi->oz_pgrp = task_pgrp_nr(current);
	sbi->sb = s;
	sbi->version = 0;
	sbi->sub_version = 0;
	sbi->type = 0;
	sbi->min_proto = 0;
	sbi->max_proto = 0;
	mutex_init(&sbi->wq_mutex);
	spin_lock_init(&sbi->fs_lock);
	sbi->queues = NULL;
	spin_lock_init(&sbi->lookup_lock);
	INIT_LIST_HEAD(&sbi->active_list);
	INIT_LIST_HEAD(&sbi->expiring_list);
	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);
	if (!root_inode)
		goto fail_ino;

	root = d_alloc_root(root_inode);
	if (!root)
		goto fail_iput;
	pipe = NULL;

	root->d_op = &autofs4_sb_dentry_operations;
	root->d_fsdata = ino;

	/* Can this call block? */
	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
				&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
				&sbi->max_proto)) {
		printk("autofs: called with bogus options\n");
		goto fail_dput;
	}

	root_inode->i_fop = &autofs4_root_operations;
	root_inode->i_op = sbi->type & AUTOFS_TYPE_DIRECT ?
			&autofs4_direct_root_inode_operations :
			&autofs4_indirect_root_inode_operations;

	/* Couldn't this be tested earlier? */
	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
		printk("autofs: kernel does not match daemon version "
		       "daemon (%d, %d) kernel (%d, %d)\n",
			sbi->min_proto, sbi->max_proto,
			AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
		goto fail_dput;
	}

	/* Establish highest kernel protocol version */
	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
		sbi->version = AUTOFS_MAX_PROTO_VERSION;
	else
		sbi->version = sbi->max_proto;
	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;
	sbi->pipefd = pipefd;
	sbi->catatonic = 0;

	/*
	 * 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_ino:
	kfree(ino);
fail_free:
	kfree(sbi);
	s->s_fs_info = NULL;
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_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;
}
Commit	Line	Data
1da177e4 LT	1	/* -- c -- --------------------------------------------------------------- *
	2	*
	3	* linux/fs/autofs/inode.c
	4	*
	5	* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
34ca959c	6	* Copyright 2005-2006 Ian Kent <raven@themaw.net>
1da177e4 LT	7	*
	8	* This file is part of the Linux kernel and is made available under
	9	* the terms of the GNU General Public License, version 2, or at your
	10	* option, any later version, incorporated herein by reference.
	11	*
	12	* ------------------------------------------------------------------------- */
	13
	14	#include <linux/kernel.h>
	15	#include <linux/slab.h>
	16	#include <linux/file.h>
d7c4a5f1	17	#include <linux/seq_file.h>
1da177e4 LT	18	#include <linux/pagemap.h>
	19	#include <linux/parser.h>
	20	#include <linux/bitops.h>
e18fa700	21	#include <linux/magic.h>
1da177e4 LT	22	#include "autofs_i.h"
	23	#include <linux/module.h>
	24
	25	static void ino_lnkfree(struct autofs_info *ino)
	26	{
25767378 IK	27	if (ino->u.symlink) {
	28	kfree(ino->u.symlink);
	29	ino->u.symlink = NULL;
	30	}
1da177e4 LT	31	}
	32
	33	struct autofs_info autofs4_init_ino(struct autofs_info ino,
	34	struct autofs_sb_info *sbi, mode_t mode)
	35	{
	36	int reinit = 1;
	37
	38	if (ino == NULL) {
	39	reinit = 0;
	40	ino = kmalloc(sizeof(*ino), GFP_KERNEL);
	41	}
	42
	43	if (ino == NULL)
	44	return NULL;
	45
25767378 IK	46	if (!reinit) {
	47	ino->flags = 0;
	48	ino->inode = NULL;
	49	ino->dentry = NULL;
	50	ino->size = 0;
	51	INIT_LIST_HEAD(&ino->active);
	52	INIT_LIST_HEAD(&ino->expiring);
	53	atomic_set(&ino->count, 0);
	54	}
f50b6f86	55
25767378	56	ino->mode = mode;
1da177e4 LT	57	ino->last_used = jiffies;
	58
	59	ino->sbi = sbi;
	60
	61	if (reinit && ino->free)
	62	(ino->free)(ino);
	63
	64	memset(&ino->u, 0, sizeof(ino->u));
	65
	66	ino->free = NULL;
	67
	68	if (S_ISLNK(mode))
	69	ino->free = ino_lnkfree;
	70
	71	return ino;
	72	}
	73
	74	void autofs4_free_ino(struct autofs_info *ino)
	75	{
1aff3c8b IK	76	struct autofs_info *p_ino;
1aff3c8b IK	77
1da177e4 LT	78	if (ino->dentry) {
1da177e4 LT	79	ino->dentry->d_fsdata = NULL;
1aff3c8b IK	80	if (ino->dentry->d_inode) {
	81	struct dentry *parent = ino->dentry->d_parent;
	82	if (atomic_dec_and_test(&ino->count)) {
	83	p_ino = autofs4_dentry_ino(parent);
	84	if (p_ino && parent != ino->dentry)
	85	atomic_dec(&p_ino->count);
	86	}
1da177e4	87	dput(ino->dentry);
1aff3c8b	88	}
1da177e4 LT	89	ino->dentry = NULL;
	90	}
	91	if (ino->free)
	92	(ino->free)(ino);
	93	kfree(ino);
	94	}
	95
104e49fc IK	96	/*
	97	* Deal with the infamous "Busy inodes after umount ..." message.
	98	*
	99	* Clean up the dentry tree. This happens with autofs if the user
	100	* space program goes away due to a SIGKILL, SIGSEGV etc.
	101	*/
	102	static void autofs4_force_release(struct autofs_sb_info *sbi)
	103	{
6ce31523	104	struct dentry *this_parent = sbi->sb->s_root;
104e49fc IK	105	struct list_head *next;
104e49fc IK	106
ba8df43c IK	107	if (!sbi->sb->s_root)
	108	return;
	109
104e49fc IK	110	spin_lock(&dcache_lock);
	111	repeat:
	112	next = this_parent->d_subdirs.next;
	113	resume:
	114	while (next != &this_parent->d_subdirs) {
5160ee6f	115	struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
104e49fc IK	116
	117	/* Negative dentry - don`t care */
	118	if (!simple_positive(dentry)) {
	119	next = next->next;
	120	continue;
	121	}
	122
	123	if (!list_empty(&dentry->d_subdirs)) {
	124	this_parent = dentry;
	125	goto repeat;
	126	}
	127
	128	next = next->next;
	129	spin_unlock(&dcache_lock);
	130
	131	DPRINTK("dentry %p %.*s",
	132	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	133
	134	dput(dentry);
	135	spin_lock(&dcache_lock);
	136	}
	137
6ce31523	138	if (this_parent != sbi->sb->s_root) {
104e49fc IK	139	struct dentry *dentry = this_parent;
104e49fc IK	140
5160ee6f	141	next = this_parent->d_u.d_child.next;
104e49fc IK	142	this_parent = this_parent->d_parent;
	143	spin_unlock(&dcache_lock);
	144	DPRINTK("parent dentry %p %.*s",
	145	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	146	dput(dentry);
	147	spin_lock(&dcache_lock);
	148	goto resume;
	149	}
	150	spin_unlock(&dcache_lock);
104e49fc IK	151	}
104e49fc IK	152
6ce31523	153	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	154	{
	155	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	156
ba8df43c IK	157	/*
	158	* In the event of a failure in get_sb_nodev the superblock
	159	* info is not present so nothing else has been setup, so
c949d4eb JK	160	* just call kill_anon_super when we are called from
c949d4eb JK	161	* deactivate_super.
ba8df43c IK	162	*/
ba8df43c IK	163	if (!sbi)
c949d4eb	164	goto out_kill_sb;
ba8df43c	165
5a11d4d0 IK	166	/* Free wait queues, close pipe */
5a11d4d0 IK	167	autofs4_catatonic_mode(sbi);
1da177e4	168
104e49fc	169	/* Clean up and release dangling references */
3370c74b	170	autofs4_force_release(sbi);
104e49fc	171
f50b6f86	172	sb->s_fs_info = NULL;
1da177e4 LT	173	kfree(sbi);
1da177e4 LT	174
c949d4eb	175	out_kill_sb:
1da177e4	176	DPRINTK("shutting down");
6ce31523	177	kill_anon_super(sb);
1da177e4 LT	178	}
1da177e4 LT	179
d7c4a5f1 IK	180	static int autofs4_show_options(struct seq_file m, struct vfsmount mnt)
	181	{
	182	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
aef97cb9	183	struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;
d7c4a5f1 IK	184
	185	if (!sbi)
	186	return 0;
	187
	188	seq_printf(m, ",fd=%d", sbi->pipefd);
aef97cb9 MS	189	if (root_inode->i_uid != 0)
	190	seq_printf(m, ",uid=%u", root_inode->i_uid);
	191	if (root_inode->i_gid != 0)
	192	seq_printf(m, ",gid=%u", root_inode->i_gid);
d7c4a5f1 IK	193	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	194	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	195	seq_printf(m, ",minproto=%d", sbi->min_proto);
	196	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	197
44d53eb0	198	if (sbi->type & AUTOFS_TYPE_OFFSET)
34ca959c	199	seq_printf(m, ",offset");
44d53eb0	200	else if (sbi->type & AUTOFS_TYPE_DIRECT)
34ca959c IK	201	seq_printf(m, ",direct");
	202	else
	203	seq_printf(m, ",indirect");
	204
d7c4a5f1 IK	205	return 0;
	206	}
	207
ee9b6d61	208	static const struct super_operations autofs4_sops = {
1da177e4	209	.statfs = simple_statfs,
d7c4a5f1	210	.show_options = autofs4_show_options,
1da177e4 LT	211	};
1da177e4 LT	212
34ca959c IK	213	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	214	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	215
a447c093	216	static const match_table_t tokens = {
1da177e4 LT	217	{Opt_fd, "fd=%u"},
	218	{Opt_uid, "uid=%u"},
	219	{Opt_gid, "gid=%u"},
	220	{Opt_pgrp, "pgrp=%u"},
	221	{Opt_minproto, "minproto=%u"},
	222	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	223	{Opt_indirect, "indirect"},
	224	{Opt_direct, "direct"},
	225	{Opt_offset, "offset"},
1da177e4 LT	226	{Opt_err, NULL}
	227	};
	228
	229	static int parse_options(char options, int pipefd, uid_t uid, gid_t gid,
d78e53c8	230	pid_t pgrp, unsigned int type, int minproto, int maxproto)
1da177e4 LT	231	{
	232	char *p;
	233	substring_t args[MAX_OPT_ARGS];
	234	int option;
	235
	236	*uid = current->uid;
	237	*gid = current->gid;
a47afb0f	238	*pgrp = task_pgrp_nr(current);
1da177e4 LT	239
	240	*minproto = AUTOFS_MIN_PROTO_VERSION;
	241	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	242
	243	*pipefd = -1;
	244
	245	if (!options)
	246	return 1;
	247
	248	while ((p = strsep(&options, ",")) != NULL) {
	249	int token;
	250	if (!*p)
	251	continue;
	252
	253	token = match_token(p, tokens, args);
	254	switch (token) {
	255	case Opt_fd:
	256	if (match_int(args, pipefd))
	257	return 1;
	258	break;
	259	case Opt_uid:
	260	if (match_int(args, &option))
	261	return 1;
	262	*uid = option;
	263	break;
	264	case Opt_gid:
	265	if (match_int(args, &option))
	266	return 1;
	267	*gid = option;
	268	break;
	269	case Opt_pgrp:
	270	if (match_int(args, &option))
	271	return 1;
	272	*pgrp = option;
	273	break;
	274	case Opt_minproto:
	275	if (match_int(args, &option))
	276	return 1;
	277	*minproto = option;
	278	break;
	279	case Opt_maxproto:
	280	if (match_int(args, &option))
	281	return 1;
	282	*maxproto = option;
	283	break;
34ca959c	284	case Opt_indirect:
44d53eb0	285	*type = AUTOFS_TYPE_INDIRECT;
34ca959c IK	286	break;
34ca959c IK	287	case Opt_direct:
44d53eb0	288	*type = AUTOFS_TYPE_DIRECT;
34ca959c IK	289	break;
34ca959c IK	290	case Opt_offset:
44d53eb0	291	*type = AUTOFS_TYPE_DIRECT \| AUTOFS_TYPE_OFFSET;
34ca959c	292	break;
1da177e4 LT	293	default:
	294	return 1;
	295	}
	296	}
	297	return (*pipefd < 0);
	298	}
	299
	300	static struct autofs_info autofs4_mkroot(struct autofs_sb_info sbi)
	301	{
	302	struct autofs_info *ino;
	303
	304	ino = autofs4_init_ino(NULL, sbi, S_IFDIR \| 0755);
	305	if (!ino)
	306	return NULL;
	307
	308	return ino;
	309	}
	310
34ca959c IK	311	static struct dentry_operations autofs4_sb_dentry_operations = {
	312	.d_release = autofs4_dentry_release,
	313	};
	314
1da177e4 LT	315	int autofs4_fill_super(struct super_block s, void data, int silent)
	316	{
	317	struct inode * root_inode;
	318	struct dentry * root;
	319	struct file * pipe;
	320	int pipefd;
	321	struct autofs_sb_info *sbi;
	322	struct autofs_info *ino;
1da177e4	323
b63d50c4	324	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	325	if (!sbi)
1da177e4 LT	326	goto fail_unlock;
	327	DPRINTK("starting up, sbi = %p",sbi);
	328
1da177e4 LT	329	s->s_fs_info = sbi;
1da177e4 LT	330	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	331	sbi->pipefd = -1;
ba8df43c IK	332	sbi->pipe = NULL;
ba8df43c IK	333	sbi->catatonic = 1;
1da177e4	334	sbi->exp_timeout = 0;
a47afb0f	335	sbi->oz_pgrp = task_pgrp_nr(current);
1da177e4 LT	336	sbi->sb = s;
	337	sbi->version = 0;
	338	sbi->sub_version = 0;
34ca959c	339	sbi->type = 0;
d7c4a5f1 IK	340	sbi->min_proto = 0;
d7c4a5f1 IK	341	sbi->max_proto = 0;
1d5599e3	342	mutex_init(&sbi->wq_mutex);
3a9720ce	343	spin_lock_init(&sbi->fs_lock);
1da177e4	344	sbi->queues = NULL;
5f6f4f28	345	spin_lock_init(&sbi->lookup_lock);
25767378	346	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	347	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	348	s->s_blocksize = 1024;
	349	s->s_blocksize_bits = 10;
	350	s->s_magic = AUTOFS_SUPER_MAGIC;
	351	s->s_op = &autofs4_sops;
	352	s->s_time_gran = 1;
	353
	354	/*
	355	* Get the root inode and dentry, but defer checking for errors.
	356	*/
	357	ino = autofs4_mkroot(sbi);
	358	if (!ino)
	359	goto fail_free;
	360	root_inode = autofs4_get_inode(s, ino);
1da177e4	361	if (!root_inode)
34ca959c	362	goto fail_ino;
1da177e4	363
1da177e4	364	root = d_alloc_root(root_inode);
1da177e4 LT	365	if (!root)
1da177e4 LT	366	goto fail_iput;
34ca959c IK	367	pipe = NULL;
	368
	369	root->d_op = &autofs4_sb_dentry_operations;
	370	root->d_fsdata = ino;
1da177e4 LT	371
1da177e4 LT	372	/* Can this call block? */
d78e53c8 SB	373	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
	374	&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
	375	&sbi->max_proto)) {
1da177e4 LT	376	printk("autofs: called with bogus options\n");
	377	goto fail_dput;
	378	}
	379
34ca959c	380	root_inode->i_fop = &autofs4_root_operations;
44d53eb0	381	root_inode->i_op = sbi->type & AUTOFS_TYPE_DIRECT ?
34ca959c IK	382	&autofs4_direct_root_inode_operations :
	383	&autofs4_indirect_root_inode_operations;
	384
1da177e4	385	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	386	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	387	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	388	printk("autofs: kernel does not match daemon version "
1da177e4 LT	389	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	390	sbi->min_proto, sbi->max_proto,
1da177e4 LT	391	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	392	goto fail_dput;
	393	}
	394
d7c4a5f1 IK	395	/* Establish highest kernel protocol version */
	396	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	397	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	398	else
	399	sbi->version = sbi->max_proto;
1da177e4 LT	400	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	401
	402	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	403	pipe = fget(pipefd);
	404
d78e53c8	405	if (!pipe) {
1da177e4 LT	406	printk("autofs: could not open pipe file descriptor\n");
	407	goto fail_dput;
	408	}
d78e53c8	409	if (!pipe->f_op \|\| !pipe->f_op->write)
1da177e4 LT	410	goto fail_fput;
1da177e4 LT	411	sbi->pipe = pipe;
d7c4a5f1	412	sbi->pipefd = pipefd;
ba8df43c	413	sbi->catatonic = 0;
1da177e4 LT	414
	415	/*
	416	* Success! Install the root dentry now to indicate completion.
	417	*/
	418	s->s_root = root;
	419	return 0;
	420
	421	/*
	422	* Failure ... clean up.
	423	*/
	424	fail_fput:
	425	printk("autofs: pipe file descriptor does not contain proper ops\n");
	426	fput(pipe);
	427	/* fall through */
	428	fail_dput:
	429	dput(root);
	430	goto fail_free;
	431	fail_iput:
	432	printk("autofs: get root dentry failed\n");
	433	iput(root_inode);
34ca959c IK	434	fail_ino:
34ca959c IK	435	kfree(ino);
1da177e4 LT	436	fail_free:
1da177e4 LT	437	kfree(sbi);
ba8df43c	438	s->s_fs_info = NULL;
1da177e4 LT	439	fail_unlock:
	440	return -EINVAL;
	441	}
	442
	443	struct inode autofs4_get_inode(struct super_block sb,
	444	struct autofs_info *inf)
	445	{
	446	struct inode *inode = new_inode(sb);
	447
	448	if (inode == NULL)
	449	return NULL;
	450
	451	inf->inode = inode;
	452	inode->i_mode = inf->mode;
	453	if (sb->s_root) {
	454	inode->i_uid = sb->s_root->d_inode->i_uid;
	455	inode->i_gid = sb->s_root->d_inode->i_gid;
	456	} else {
	457	inode->i_uid = 0;
	458	inode->i_gid = 0;
	459	}
1da177e4 LT	460	inode->i_blocks = 0;
	461	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	462
	463	if (S_ISDIR(inf->mode)) {
	464	inode->i_nlink = 2;
	465	inode->i_op = &autofs4_dir_inode_operations;
	466	inode->i_fop = &autofs4_dir_operations;
	467	} else if (S_ISLNK(inf->mode)) {
	468	inode->i_size = inf->size;
	469	inode->i_op = &autofs4_symlink_inode_operations;
	470	}
	471
	472	return inode;
	473	}