[linux.git] / fs / autofs4 / inode.c

/* -*- c -*- --------------------------------------------------------------- *
 *
 * linux/fs/autofs/inode.c
 *
 *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
 *  Copyright 2005-2006 Ian Kent <[email protected]>
 *
 * 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->rehash_list);
		ino->active_count = 0;
		INIT_LIST_HEAD(&ino->expiring);
		atomic_set(&ino->count, 0);
	}

	ino->uid = 0;
	ino->gid = 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 (autofs_type_offset(sbi->type))
		seq_printf(m, ",offset");
	else if (autofs_type_direct(sbi->type))
		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:
			set_autofs_type_indirect(type);
			break;
		case Opt_direct:
			set_autofs_type_direct(type);
			break;
		case Opt_offset:
			set_autofs_type_offset(type);
			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 const 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;
	set_autofs_type_indirect(&sbi->type);
	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 = autofs_type_trigger(sbi->type) ?
			&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;
	}
	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 <[email protected]>
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);
213614d5	52	INIT_LIST_HEAD(&ino->rehash_list);
4f8427d1	53	ino->active_count = 0;
25767378 IK	54	INIT_LIST_HEAD(&ino->expiring);
	55	atomic_set(&ino->count, 0);
	56	}
f50b6f86	57
c0f54d3e IK	58	ino->uid = 0;
c0f54d3e IK	59	ino->gid = 0;
25767378	60	ino->mode = mode;
1da177e4 LT	61	ino->last_used = jiffies;
	62
	63	ino->sbi = sbi;
	64
	65	if (reinit && ino->free)
	66	(ino->free)(ino);
	67
	68	memset(&ino->u, 0, sizeof(ino->u));
	69
	70	ino->free = NULL;
	71
	72	if (S_ISLNK(mode))
	73	ino->free = ino_lnkfree;
	74
	75	return ino;
	76	}
	77
	78	void autofs4_free_ino(struct autofs_info *ino)
	79	{
1aff3c8b IK	80	struct autofs_info *p_ino;
1aff3c8b IK	81
1da177e4 LT	82	if (ino->dentry) {
1da177e4 LT	83	ino->dentry->d_fsdata = NULL;
1aff3c8b IK	84	if (ino->dentry->d_inode) {
	85	struct dentry *parent = ino->dentry->d_parent;
	86	if (atomic_dec_and_test(&ino->count)) {
	87	p_ino = autofs4_dentry_ino(parent);
	88	if (p_ino && parent != ino->dentry)
	89	atomic_dec(&p_ino->count);
	90	}
1da177e4	91	dput(ino->dentry);
1aff3c8b	92	}
1da177e4 LT	93	ino->dentry = NULL;
	94	}
	95	if (ino->free)
	96	(ino->free)(ino);
	97	kfree(ino);
	98	}
	99
104e49fc IK	100	/*
	101	* Deal with the infamous "Busy inodes after umount ..." message.
	102	*
	103	* Clean up the dentry tree. This happens with autofs if the user
	104	* space program goes away due to a SIGKILL, SIGSEGV etc.
	105	*/
	106	static void autofs4_force_release(struct autofs_sb_info *sbi)
	107	{
6ce31523	108	struct dentry *this_parent = sbi->sb->s_root;
104e49fc IK	109	struct list_head *next;
104e49fc IK	110
ba8df43c IK	111	if (!sbi->sb->s_root)
	112	return;
	113
104e49fc IK	114	spin_lock(&dcache_lock);
	115	repeat:
	116	next = this_parent->d_subdirs.next;
	117	resume:
	118	while (next != &this_parent->d_subdirs) {
5160ee6f	119	struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
104e49fc IK	120
	121	/* Negative dentry - don`t care */
	122	if (!simple_positive(dentry)) {
	123	next = next->next;
	124	continue;
	125	}
	126
	127	if (!list_empty(&dentry->d_subdirs)) {
	128	this_parent = dentry;
	129	goto repeat;
	130	}
	131
	132	next = next->next;
	133	spin_unlock(&dcache_lock);
	134
	135	DPRINTK("dentry %p %.*s",
	136	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	137
	138	dput(dentry);
	139	spin_lock(&dcache_lock);
	140	}
	141
6ce31523	142	if (this_parent != sbi->sb->s_root) {
104e49fc IK	143	struct dentry *dentry = this_parent;
104e49fc IK	144
5160ee6f	145	next = this_parent->d_u.d_child.next;
104e49fc IK	146	this_parent = this_parent->d_parent;
	147	spin_unlock(&dcache_lock);
	148	DPRINTK("parent dentry %p %.*s",
	149	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	150	dput(dentry);
	151	spin_lock(&dcache_lock);
	152	goto resume;
	153	}
	154	spin_unlock(&dcache_lock);
104e49fc IK	155	}
104e49fc IK	156
6ce31523	157	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	158	{
	159	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	160
ba8df43c IK	161	/*
	162	* In the event of a failure in get_sb_nodev the superblock
	163	* info is not present so nothing else has been setup, so
c949d4eb JK	164	* just call kill_anon_super when we are called from
c949d4eb JK	165	* deactivate_super.
ba8df43c IK	166	*/
ba8df43c IK	167	if (!sbi)
c949d4eb	168	goto out_kill_sb;
ba8df43c	169
5a11d4d0 IK	170	/* Free wait queues, close pipe */
5a11d4d0 IK	171	autofs4_catatonic_mode(sbi);
1da177e4	172
104e49fc	173	/* Clean up and release dangling references */
3370c74b	174	autofs4_force_release(sbi);
104e49fc	175
f50b6f86	176	sb->s_fs_info = NULL;
1da177e4 LT	177	kfree(sbi);
1da177e4 LT	178
c949d4eb	179	out_kill_sb:
1da177e4	180	DPRINTK("shutting down");
6ce31523	181	kill_anon_super(sb);
1da177e4 LT	182	}
1da177e4 LT	183
d7c4a5f1 IK	184	static int autofs4_show_options(struct seq_file m, struct vfsmount mnt)
	185	{
	186	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
aef97cb9	187	struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;
d7c4a5f1 IK	188
	189	if (!sbi)
	190	return 0;
	191
	192	seq_printf(m, ",fd=%d", sbi->pipefd);
aef97cb9 MS	193	if (root_inode->i_uid != 0)
	194	seq_printf(m, ",uid=%u", root_inode->i_uid);
	195	if (root_inode->i_gid != 0)
	196	seq_printf(m, ",gid=%u", root_inode->i_gid);
d7c4a5f1 IK	197	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	198	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	199	seq_printf(m, ",minproto=%d", sbi->min_proto);
	200	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	201
a92daf6b	202	if (autofs_type_offset(sbi->type))
34ca959c	203	seq_printf(m, ",offset");
a92daf6b	204	else if (autofs_type_direct(sbi->type))
34ca959c IK	205	seq_printf(m, ",direct");
	206	else
	207	seq_printf(m, ",indirect");
	208
d7c4a5f1 IK	209	return 0;
	210	}
	211
ee9b6d61	212	static const struct super_operations autofs4_sops = {
1da177e4	213	.statfs = simple_statfs,
d7c4a5f1	214	.show_options = autofs4_show_options,
1da177e4 LT	215	};
1da177e4 LT	216
34ca959c IK	217	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	218	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	219
a447c093	220	static const match_table_t tokens = {
1da177e4 LT	221	{Opt_fd, "fd=%u"},
	222	{Opt_uid, "uid=%u"},
	223	{Opt_gid, "gid=%u"},
	224	{Opt_pgrp, "pgrp=%u"},
	225	{Opt_minproto, "minproto=%u"},
	226	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	227	{Opt_indirect, "indirect"},
	228	{Opt_direct, "direct"},
	229	{Opt_offset, "offset"},
1da177e4 LT	230	{Opt_err, NULL}
	231	};
	232
	233	static int parse_options(char options, int pipefd, uid_t uid, gid_t gid,
d78e53c8	234	pid_t pgrp, unsigned int type, int minproto, int maxproto)
1da177e4 LT	235	{
	236	char *p;
	237	substring_t args[MAX_OPT_ARGS];
	238	int option;
	239
0eb790e3 DH	240	*uid = current_uid();
0eb790e3 DH	241	*gid = current_gid();
a47afb0f	242	*pgrp = task_pgrp_nr(current);
1da177e4 LT	243
	244	*minproto = AUTOFS_MIN_PROTO_VERSION;
	245	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	246
	247	*pipefd = -1;
	248
	249	if (!options)
	250	return 1;
	251
	252	while ((p = strsep(&options, ",")) != NULL) {
	253	int token;
	254	if (!*p)
	255	continue;
	256
	257	token = match_token(p, tokens, args);
	258	switch (token) {
	259	case Opt_fd:
	260	if (match_int(args, pipefd))
	261	return 1;
	262	break;
	263	case Opt_uid:
	264	if (match_int(args, &option))
	265	return 1;
	266	*uid = option;
	267	break;
	268	case Opt_gid:
	269	if (match_int(args, &option))
	270	return 1;
	271	*gid = option;
	272	break;
	273	case Opt_pgrp:
	274	if (match_int(args, &option))
	275	return 1;
	276	*pgrp = option;
	277	break;
	278	case Opt_minproto:
	279	if (match_int(args, &option))
	280	return 1;
	281	*minproto = option;
	282	break;
	283	case Opt_maxproto:
	284	if (match_int(args, &option))
	285	return 1;
	286	*maxproto = option;
	287	break;
34ca959c	288	case Opt_indirect:
a92daf6b	289	set_autofs_type_indirect(type);
34ca959c IK	290	break;
34ca959c IK	291	case Opt_direct:
a92daf6b	292	set_autofs_type_direct(type);
34ca959c IK	293	break;
34ca959c IK	294	case Opt_offset:
a92daf6b	295	set_autofs_type_offset(type);
34ca959c	296	break;
1da177e4 LT	297	default:
	298	return 1;
	299	}
	300	}
	301	return (*pipefd < 0);
	302	}
	303
	304	static struct autofs_info autofs4_mkroot(struct autofs_sb_info sbi)
	305	{
	306	struct autofs_info *ino;
	307
	308	ino = autofs4_init_ino(NULL, sbi, S_IFDIR \| 0755);
	309	if (!ino)
	310	return NULL;
	311
	312	return ino;
	313	}
	314
08f11513	315	static const struct dentry_operations autofs4_sb_dentry_operations = {
34ca959c IK	316	.d_release = autofs4_dentry_release,
	317	};
	318
1da177e4 LT	319	int autofs4_fill_super(struct super_block s, void data, int silent)
	320	{
	321	struct inode * root_inode;
	322	struct dentry * root;
	323	struct file * pipe;
	324	int pipefd;
	325	struct autofs_sb_info *sbi;
	326	struct autofs_info *ino;
1da177e4	327
b63d50c4	328	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	329	if (!sbi)
1da177e4 LT	330	goto fail_unlock;
	331	DPRINTK("starting up, sbi = %p",sbi);
	332
1da177e4 LT	333	s->s_fs_info = sbi;
1da177e4 LT	334	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	335	sbi->pipefd = -1;
ba8df43c IK	336	sbi->pipe = NULL;
ba8df43c IK	337	sbi->catatonic = 1;
1da177e4	338	sbi->exp_timeout = 0;
a47afb0f	339	sbi->oz_pgrp = task_pgrp_nr(current);
1da177e4 LT	340	sbi->sb = s;
	341	sbi->version = 0;
	342	sbi->sub_version = 0;
a92daf6b	343	set_autofs_type_indirect(&sbi->type);
d7c4a5f1 IK	344	sbi->min_proto = 0;
d7c4a5f1 IK	345	sbi->max_proto = 0;
1d5599e3	346	mutex_init(&sbi->wq_mutex);
3a9720ce	347	spin_lock_init(&sbi->fs_lock);
1da177e4	348	sbi->queues = NULL;
5f6f4f28	349	spin_lock_init(&sbi->lookup_lock);
25767378	350	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	351	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	352	s->s_blocksize = 1024;
	353	s->s_blocksize_bits = 10;
	354	s->s_magic = AUTOFS_SUPER_MAGIC;
	355	s->s_op = &autofs4_sops;
	356	s->s_time_gran = 1;
	357
	358	/*
	359	* Get the root inode and dentry, but defer checking for errors.
	360	*/
	361	ino = autofs4_mkroot(sbi);
	362	if (!ino)
	363	goto fail_free;
	364	root_inode = autofs4_get_inode(s, ino);
1da177e4	365	if (!root_inode)
34ca959c	366	goto fail_ino;
1da177e4	367
1da177e4	368	root = d_alloc_root(root_inode);
1da177e4 LT	369	if (!root)
1da177e4 LT	370	goto fail_iput;
34ca959c IK	371	pipe = NULL;
	372
	373	root->d_op = &autofs4_sb_dentry_operations;
	374	root->d_fsdata = ino;
1da177e4 LT	375
1da177e4 LT	376	/* Can this call block? */
d78e53c8 SB	377	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
	378	&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
	379	&sbi->max_proto)) {
1da177e4 LT	380	printk("autofs: called with bogus options\n");
	381	goto fail_dput;
	382	}
	383
34ca959c	384	root_inode->i_fop = &autofs4_root_operations;
a92daf6b	385	root_inode->i_op = autofs_type_trigger(sbi->type) ?
34ca959c IK	386	&autofs4_direct_root_inode_operations :
	387	&autofs4_indirect_root_inode_operations;
	388
1da177e4	389	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	390	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	391	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	392	printk("autofs: kernel does not match daemon version "
1da177e4 LT	393	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	394	sbi->min_proto, sbi->max_proto,
1da177e4 LT	395	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	396	goto fail_dput;
	397	}
	398
d7c4a5f1 IK	399	/* Establish highest kernel protocol version */
	400	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	401	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	402	else
	403	sbi->version = sbi->max_proto;
1da177e4 LT	404	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	405
	406	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	407	pipe = fget(pipefd);
	408
d78e53c8	409	if (!pipe) {
1da177e4 LT	410	printk("autofs: could not open pipe file descriptor\n");
	411	goto fail_dput;
	412	}
d78e53c8	413	if (!pipe->f_op \|\| !pipe->f_op->write)
1da177e4 LT	414	goto fail_fput;
1da177e4 LT	415	sbi->pipe = pipe;
d7c4a5f1	416	sbi->pipefd = pipefd;
ba8df43c	417	sbi->catatonic = 0;
1da177e4 LT	418
	419	/*
	420	* Success! Install the root dentry now to indicate completion.
	421	*/
	422	s->s_root = root;
	423	return 0;
	424
	425	/*
	426	* Failure ... clean up.
	427	*/
	428	fail_fput:
	429	printk("autofs: pipe file descriptor does not contain proper ops\n");
	430	fput(pipe);
	431	/* fall through */
	432	fail_dput:
	433	dput(root);
	434	goto fail_free;
	435	fail_iput:
	436	printk("autofs: get root dentry failed\n");
	437	iput(root_inode);
34ca959c IK	438	fail_ino:
34ca959c IK	439	kfree(ino);
1da177e4 LT	440	fail_free:
1da177e4 LT	441	kfree(sbi);
ba8df43c	442	s->s_fs_info = NULL;
1da177e4 LT	443	fail_unlock:
	444	return -EINVAL;
	445	}
	446
	447	struct inode autofs4_get_inode(struct super_block sb,
	448	struct autofs_info *inf)
	449	{
	450	struct inode *inode = new_inode(sb);
	451
	452	if (inode == NULL)
	453	return NULL;
	454
	455	inf->inode = inode;
	456	inode->i_mode = inf->mode;
	457	if (sb->s_root) {
	458	inode->i_uid = sb->s_root->d_inode->i_uid;
	459	inode->i_gid = sb->s_root->d_inode->i_gid;
1da177e4	460	}
1da177e4 LT	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	}