[mirror_ubuntu-zesty-kernel.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);
		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);
}

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);

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

out_kill_sb:
	DPRINTK("shutting down");
	kill_litter_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_automount	= autofs4_d_automount,
	.d_manage	= autofs4_d_manage,
	.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;

	d_set_d_op(root, &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;
	}

	if (autofs_type_trigger(sbi->type))
		__managed_dentry_set_managed(root);

	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;
	inode->i_ino = get_next_ino();

	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);
4f8427d1	52	ino->active_count = 0;
25767378 IK	53	INIT_LIST_HEAD(&ino->expiring);
	54	atomic_set(&ino->count, 0);
	55	}
f50b6f86	56
c0f54d3e IK	57	ino->uid = 0;
c0f54d3e IK	58	ino->gid = 0;
25767378	59	ino->mode = mode;
1da177e4 LT	60	ino->last_used = jiffies;
	61
	62	ino->sbi = sbi;
	63
	64	if (reinit && ino->free)
	65	(ino->free)(ino);
	66
	67	memset(&ino->u, 0, sizeof(ino->u));
	68
	69	ino->free = NULL;
	70
	71	if (S_ISLNK(mode))
	72	ino->free = ino_lnkfree;
	73
	74	return ino;
	75	}
	76
	77	void autofs4_free_ino(struct autofs_info *ino)
	78	{
1aff3c8b IK	79	struct autofs_info *p_ino;
1aff3c8b IK	80
1da177e4 LT	81	if (ino->dentry) {
1da177e4 LT	82	ino->dentry->d_fsdata = NULL;
1aff3c8b IK	83	if (ino->dentry->d_inode) {
	84	struct dentry *parent = ino->dentry->d_parent;
	85	if (atomic_dec_and_test(&ino->count)) {
	86	p_ino = autofs4_dentry_ino(parent);
	87	if (p_ino && parent != ino->dentry)
	88	atomic_dec(&p_ino->count);
	89	}
1da177e4	90	dput(ino->dentry);
1aff3c8b	91	}
1da177e4 LT	92	ino->dentry = NULL;
	93	}
	94	if (ino->free)
	95	(ino->free)(ino);
	96	kfree(ino);
	97	}
	98
6ce31523	99	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	100	{
	101	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	102
ba8df43c IK	103	/*
	104	* In the event of a failure in get_sb_nodev the superblock
	105	* info is not present so nothing else has been setup, so
c949d4eb JK	106	* just call kill_anon_super when we are called from
c949d4eb JK	107	* deactivate_super.
ba8df43c IK	108	*/
ba8df43c IK	109	if (!sbi)
c949d4eb	110	goto out_kill_sb;
ba8df43c	111
5a11d4d0 IK	112	/* Free wait queues, close pipe */
5a11d4d0 IK	113	autofs4_catatonic_mode(sbi);
1da177e4	114
f50b6f86	115	sb->s_fs_info = NULL;
1da177e4 LT	116	kfree(sbi);
1da177e4 LT	117
c949d4eb	118	out_kill_sb:
1da177e4	119	DPRINTK("shutting down");
5b7e934d	120	kill_litter_super(sb);
1da177e4 LT	121	}
1da177e4 LT	122
d7c4a5f1 IK	123	static int autofs4_show_options(struct seq_file m, struct vfsmount mnt)
	124	{
	125	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
aef97cb9	126	struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;
d7c4a5f1 IK	127
	128	if (!sbi)
	129	return 0;
	130
	131	seq_printf(m, ",fd=%d", sbi->pipefd);
aef97cb9 MS	132	if (root_inode->i_uid != 0)
	133	seq_printf(m, ",uid=%u", root_inode->i_uid);
	134	if (root_inode->i_gid != 0)
	135	seq_printf(m, ",gid=%u", root_inode->i_gid);
d7c4a5f1 IK	136	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	137	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	138	seq_printf(m, ",minproto=%d", sbi->min_proto);
	139	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	140
a92daf6b	141	if (autofs_type_offset(sbi->type))
34ca959c	142	seq_printf(m, ",offset");
a92daf6b	143	else if (autofs_type_direct(sbi->type))
34ca959c IK	144	seq_printf(m, ",direct");
	145	else
	146	seq_printf(m, ",indirect");
	147
d7c4a5f1 IK	148	return 0;
	149	}
	150
ee9b6d61	151	static const struct super_operations autofs4_sops = {
1da177e4	152	.statfs = simple_statfs,
d7c4a5f1	153	.show_options = autofs4_show_options,
1da177e4 LT	154	};
1da177e4 LT	155
34ca959c IK	156	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	157	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	158
a447c093	159	static const match_table_t tokens = {
1da177e4 LT	160	{Opt_fd, "fd=%u"},
	161	{Opt_uid, "uid=%u"},
	162	{Opt_gid, "gid=%u"},
	163	{Opt_pgrp, "pgrp=%u"},
	164	{Opt_minproto, "minproto=%u"},
	165	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	166	{Opt_indirect, "indirect"},
	167	{Opt_direct, "direct"},
	168	{Opt_offset, "offset"},
1da177e4 LT	169	{Opt_err, NULL}
	170	};
	171
	172	static int parse_options(char options, int pipefd, uid_t uid, gid_t gid,
d78e53c8	173	pid_t pgrp, unsigned int type, int minproto, int maxproto)
1da177e4 LT	174	{
	175	char *p;
	176	substring_t args[MAX_OPT_ARGS];
	177	int option;
	178
0eb790e3 DH	179	*uid = current_uid();
0eb790e3 DH	180	*gid = current_gid();
a47afb0f	181	*pgrp = task_pgrp_nr(current);
1da177e4 LT	182
	183	*minproto = AUTOFS_MIN_PROTO_VERSION;
	184	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	185
	186	*pipefd = -1;
	187
	188	if (!options)
	189	return 1;
	190
	191	while ((p = strsep(&options, ",")) != NULL) {
	192	int token;
	193	if (!*p)
	194	continue;
	195
	196	token = match_token(p, tokens, args);
	197	switch (token) {
	198	case Opt_fd:
	199	if (match_int(args, pipefd))
	200	return 1;
	201	break;
	202	case Opt_uid:
	203	if (match_int(args, &option))
	204	return 1;
	205	*uid = option;
	206	break;
	207	case Opt_gid:
	208	if (match_int(args, &option))
	209	return 1;
	210	*gid = option;
	211	break;
	212	case Opt_pgrp:
	213	if (match_int(args, &option))
	214	return 1;
	215	*pgrp = option;
	216	break;
	217	case Opt_minproto:
	218	if (match_int(args, &option))
	219	return 1;
	220	*minproto = option;
	221	break;
	222	case Opt_maxproto:
	223	if (match_int(args, &option))
	224	return 1;
	225	*maxproto = option;
	226	break;
34ca959c	227	case Opt_indirect:
a92daf6b	228	set_autofs_type_indirect(type);
34ca959c IK	229	break;
34ca959c IK	230	case Opt_direct:
a92daf6b	231	set_autofs_type_direct(type);
34ca959c IK	232	break;
34ca959c IK	233	case Opt_offset:
a92daf6b	234	set_autofs_type_offset(type);
34ca959c	235	break;
1da177e4 LT	236	default:
	237	return 1;
	238	}
	239	}
	240	return (*pipefd < 0);
	241	}
	242
	243	static struct autofs_info autofs4_mkroot(struct autofs_sb_info sbi)
	244	{
	245	struct autofs_info *ino;
	246
	247	ino = autofs4_init_ino(NULL, sbi, S_IFDIR \| 0755);
	248	if (!ino)
	249	return NULL;
	250
	251	return ino;
	252	}
	253
08f11513	254	static const struct dentry_operations autofs4_sb_dentry_operations = {
10584211	255	.d_automount = autofs4_d_automount,
b5b80177	256	.d_manage = autofs4_d_manage,
34ca959c IK	257	.d_release = autofs4_dentry_release,
	258	};
	259
1da177e4 LT	260	int autofs4_fill_super(struct super_block s, void data, int silent)
	261	{
	262	struct inode * root_inode;
	263	struct dentry * root;
	264	struct file * pipe;
	265	int pipefd;
	266	struct autofs_sb_info *sbi;
	267	struct autofs_info *ino;
1da177e4	268
b63d50c4	269	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	270	if (!sbi)
1da177e4 LT	271	goto fail_unlock;
	272	DPRINTK("starting up, sbi = %p",sbi);
	273
1da177e4 LT	274	s->s_fs_info = sbi;
1da177e4 LT	275	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	276	sbi->pipefd = -1;
ba8df43c IK	277	sbi->pipe = NULL;
ba8df43c IK	278	sbi->catatonic = 1;
1da177e4	279	sbi->exp_timeout = 0;
a47afb0f	280	sbi->oz_pgrp = task_pgrp_nr(current);
1da177e4 LT	281	sbi->sb = s;
	282	sbi->version = 0;
	283	sbi->sub_version = 0;
a92daf6b	284	set_autofs_type_indirect(&sbi->type);
d7c4a5f1 IK	285	sbi->min_proto = 0;
d7c4a5f1 IK	286	sbi->max_proto = 0;
1d5599e3	287	mutex_init(&sbi->wq_mutex);
3a9720ce	288	spin_lock_init(&sbi->fs_lock);
1da177e4	289	sbi->queues = NULL;
5f6f4f28	290	spin_lock_init(&sbi->lookup_lock);
25767378	291	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	292	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	293	s->s_blocksize = 1024;
	294	s->s_blocksize_bits = 10;
	295	s->s_magic = AUTOFS_SUPER_MAGIC;
	296	s->s_op = &autofs4_sops;
	297	s->s_time_gran = 1;
	298
	299	/*
	300	* Get the root inode and dentry, but defer checking for errors.
	301	*/
	302	ino = autofs4_mkroot(sbi);
	303	if (!ino)
	304	goto fail_free;
	305	root_inode = autofs4_get_inode(s, ino);
1da177e4	306	if (!root_inode)
34ca959c	307	goto fail_ino;
1da177e4	308
1da177e4	309	root = d_alloc_root(root_inode);
1da177e4 LT	310	if (!root)
1da177e4 LT	311	goto fail_iput;
34ca959c IK	312	pipe = NULL;
34ca959c IK	313
fb045adb	314	d_set_d_op(root, &autofs4_sb_dentry_operations);
34ca959c	315	root->d_fsdata = ino;
1da177e4 LT	316
1da177e4 LT	317	/* Can this call block? */
d78e53c8 SB	318	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
	319	&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
	320	&sbi->max_proto)) {
1da177e4 LT	321	printk("autofs: called with bogus options\n");
	322	goto fail_dput;
	323	}
	324
10584211	325	if (autofs_type_trigger(sbi->type))
b5b80177	326	__managed_dentry_set_managed(root);
10584211	327
34ca959c	328	root_inode->i_fop = &autofs4_root_operations;
a92daf6b	329	root_inode->i_op = autofs_type_trigger(sbi->type) ?
34ca959c IK	330	&autofs4_direct_root_inode_operations :
	331	&autofs4_indirect_root_inode_operations;
	332
1da177e4	333	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	334	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	335	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	336	printk("autofs: kernel does not match daemon version "
1da177e4 LT	337	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	338	sbi->min_proto, sbi->max_proto,
1da177e4 LT	339	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	340	goto fail_dput;
	341	}
	342
d7c4a5f1 IK	343	/* Establish highest kernel protocol version */
	344	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	345	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	346	else
	347	sbi->version = sbi->max_proto;
1da177e4 LT	348	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	349
	350	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	351	pipe = fget(pipefd);
	352
d78e53c8	353	if (!pipe) {
1da177e4 LT	354	printk("autofs: could not open pipe file descriptor\n");
	355	goto fail_dput;
	356	}
d78e53c8	357	if (!pipe->f_op \|\| !pipe->f_op->write)
1da177e4 LT	358	goto fail_fput;
1da177e4 LT	359	sbi->pipe = pipe;
d7c4a5f1	360	sbi->pipefd = pipefd;
ba8df43c	361	sbi->catatonic = 0;
1da177e4 LT	362
	363	/*
	364	* Success! Install the root dentry now to indicate completion.
	365	*/
	366	s->s_root = root;
	367	return 0;
	368
	369	/*
	370	* Failure ... clean up.
	371	*/
	372	fail_fput:
	373	printk("autofs: pipe file descriptor does not contain proper ops\n");
	374	fput(pipe);
	375	/* fall through */
	376	fail_dput:
	377	dput(root);
	378	goto fail_free;
	379	fail_iput:
	380	printk("autofs: get root dentry failed\n");
	381	iput(root_inode);
34ca959c IK	382	fail_ino:
34ca959c IK	383	kfree(ino);
1da177e4 LT	384	fail_free:
1da177e4 LT	385	kfree(sbi);
ba8df43c	386	s->s_fs_info = NULL;
1da177e4 LT	387	fail_unlock:
	388	return -EINVAL;
	389	}
	390
	391	struct inode autofs4_get_inode(struct super_block sb,
	392	struct autofs_info *inf)
	393	{
	394	struct inode *inode = new_inode(sb);
	395
	396	if (inode == NULL)
	397	return NULL;
	398
	399	inf->inode = inode;
	400	inode->i_mode = inf->mode;
	401	if (sb->s_root) {
	402	inode->i_uid = sb->s_root->d_inode->i_uid;
	403	inode->i_gid = sb->s_root->d_inode->i_gid;
1da177e4	404	}
1da177e4	405	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
85fe4025	406	inode->i_ino = get_next_ino();
1da177e4 LT	407
	408	if (S_ISDIR(inf->mode)) {
	409	inode->i_nlink = 2;
	410	inode->i_op = &autofs4_dir_inode_operations;
	411	inode->i_fop = &autofs4_dir_operations;
	412	} else if (S_ISLNK(inf->mode)) {
	413	inode->i_size = inf->size;
	414	inode->i_op = &autofs4_symlink_inode_operations;
	415	}
	416
	417	return inode;
	418	}