[deliverable/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 <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>

struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
{
	struct autofs_info *ino = kzalloc(sizeof(*ino), GFP_KERNEL);
	if (ino) {
		INIT_LIST_HEAD(&ino->active);
		INIT_LIST_HEAD(&ino->expiring);
		ino->last_used = jiffies;
		ino->sbi = sbi;
	}
	return ino;
}

void autofs4_clean_ino(struct autofs_info *ino)
{
	ino->uid = GLOBAL_ROOT_UID;
	ino->gid = GLOBAL_ROOT_GID;
	ino->last_used = jiffies;
}

void autofs4_free_ino(struct autofs_info *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) {
		/* Free wait queues, close pipe */
		autofs4_catatonic_mode(sbi);
		put_pid(sbi->oz_pgrp);
	}

	DPRINTK("shutting down");
	kill_litter_super(sb);
	if (sbi)
		kfree_rcu(sbi, rcu);
}

static int autofs4_show_options(struct seq_file *m, struct dentry *root)
{
	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
	struct inode *root_inode = d_inode(root->d_sb->s_root);

	if (!sbi)
		return 0;

	seq_printf(m, ",fd=%d", sbi->pipefd);
	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
		seq_printf(m, ",uid=%u",
			from_kuid_munged(&init_user_ns, root_inode->i_uid));
	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
		seq_printf(m, ",gid=%u",
			from_kgid_munged(&init_user_ns, root_inode->i_gid));
	seq_printf(m, ",pgrp=%d", pid_vnr(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");
#ifdef CONFIG_CHECKPOINT_RESTORE
	if (sbi->pipe)
		seq_printf(m, ",pipe_ino=%ld", sbi->pipe->f_inode->i_ino);
	else
		seq_printf(m, ",pipe_ino=-1");
#endif
	return 0;
}

static void autofs4_evict_inode(struct inode *inode)
{
	clear_inode(inode);
	kfree(inode->i_private);
}

static const struct super_operations autofs4_sops = {
	.statfs		= simple_statfs,
	.show_options	= autofs4_show_options,
	.evict_inode	= autofs4_evict_inode,
};

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, kuid_t *uid, kgid_t *gid,
			 int *pgrp, bool *pgrp_set, unsigned int *type,
			 int *minproto, int *maxproto)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;

	*uid = current_uid();
	*gid = current_gid();

	*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 = make_kuid(current_user_ns(), option);
			if (!uid_valid(*uid))
				return 1;
			break;
		case Opt_gid:
			if (match_int(args, &option))
				return 1;
			*gid = make_kgid(current_user_ns(), option);
			if (!gid_valid(*gid))
				return 1;
			break;
		case Opt_pgrp:
			if (match_int(args, &option))
				return 1;
			*pgrp = option;
			*pgrp_set = true;
			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);
}

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;
	int pgrp = 0;
	bool pgrp_set = false;
	int ret = -EINVAL;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	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 = NULL;
	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);
	mutex_init(&sbi->pipe_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_d_op = &autofs4_dentry_operations;
	s->s_time_gran = 1;

	/*
	 * Get the root inode and dentry, but defer checking for errors.
	 */
	ino = autofs4_new_ino(sbi);
	if (!ino) {
		ret = -ENOMEM;
		goto fail_free;
	}
	root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
	root = d_make_root(root_inode);
	if (!root)
		goto fail_ino;
	pipe = NULL;

	root->d_fsdata = ino;

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

	if (pgrp_set) {
		sbi->oz_pgrp = find_get_pid(pgrp);
		if (!sbi->oz_pgrp) {
			pr_warn("autofs: could not find process group %d\n",
				pgrp);
			goto fail_dput;
		}
	} else {
		sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
	}

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

	root_inode->i_fop = &autofs4_root_operations;
	root_inode->i_op = &autofs4_dir_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, pid_nr(sbi->oz_pgrp));
	pipe = fget(pipefd);

	if (!pipe) {
		printk("autofs: could not open pipe file descriptor\n");
		goto fail_dput;
	}
	ret = autofs_prepare_pipe(pipe);
	if (ret < 0)
		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_ino:
	kfree(ino);
fail_free:
	put_pid(sbi->oz_pgrp);
	kfree(sbi);
	s->s_fs_info = NULL;
	return ret;
}

struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
{
	struct inode *inode = new_inode(sb);

	if (inode == NULL)
		return NULL;

	inode->i_mode = mode;
	if (sb->s_root) {
		inode->i_uid = d_inode(sb->s_root)->i_uid;
		inode->i_gid = d_inode(sb->s_root)->i_gid;
	}
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	inode->i_ino = get_next_ino();

	if (S_ISDIR(mode)) {
		set_nlink(inode, 2);
		inode->i_op = &autofs4_dir_inode_operations;
		inode->i_fop = &autofs4_dir_operations;
	} else if (S_ISLNK(mode)) {
		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
26e6c910	25	struct autofs_info autofs4_new_ino(struct autofs_sb_info sbi)
1da177e4	26	{
26e6c910 AV	27	struct autofs_info ino = kzalloc(sizeof(ino), GFP_KERNEL);
26e6c910 AV	28	if (ino) {
25767378 IK	29	INIT_LIST_HEAD(&ino->active);
25767378 IK	30	INIT_LIST_HEAD(&ino->expiring);
26e6c910 AV	31	ino->last_used = jiffies;
26e6c910 AV	32	ino->sbi = sbi;
25767378	33	}
26e6c910 AV	34	return ino;
26e6c910 AV	35	}
f50b6f86	36
26e6c910 AV	37	void autofs4_clean_ino(struct autofs_info *ino)
26e6c910 AV	38	{
45634cd8 EB	39	ino->uid = GLOBAL_ROOT_UID;
45634cd8 EB	40	ino->gid = GLOBAL_ROOT_GID;
1da177e4	41	ino->last_used = jiffies;
1da177e4 LT	42	}
	43
	44	void autofs4_free_ino(struct autofs_info *ino)
	45	{
1da177e4 LT	46	kfree(ino);
	47	}
	48
6ce31523	49	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	50	{
	51	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	52
ba8df43c IK	53	/*
	54	* In the event of a failure in get_sb_nodev the superblock
	55	* info is not present so nothing else has been setup, so
c949d4eb JK	56	* just call kill_anon_super when we are called from
c949d4eb JK	57	* deactivate_super.
ba8df43c	58	*/
6eaba35b SB	59	if (sbi) {
6eaba35b SB	60	/* Free wait queues, close pipe */
baa40671	61	autofs4_catatonic_mode(sbi);
6eaba35b SB	62	put_pid(sbi->oz_pgrp);
6eaba35b SB	63	}
1da177e4 LT	64
1da177e4 LT	65	DPRINTK("shutting down");
5b7e934d	66	kill_litter_super(sb);
baa40671 AV	67	if (sbi)
baa40671 AV	68	kfree_rcu(sbi, rcu);
1da177e4 LT	69	}
1da177e4 LT	70
34c80b1d	71	static int autofs4_show_options(struct seq_file m, struct dentry root)
d7c4a5f1	72	{
34c80b1d	73	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
2b0143b5	74	struct inode *root_inode = d_inode(root->d_sb->s_root);
d7c4a5f1 IK	75
	76	if (!sbi)
	77	return 0;
	78
	79	seq_printf(m, ",fd=%d", sbi->pipefd);
45634cd8 EB	80	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
	81	seq_printf(m, ",uid=%u",
	82	from_kuid_munged(&init_user_ns, root_inode->i_uid));
	83	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
	84	seq_printf(m, ",gid=%u",
	85	from_kgid_munged(&init_user_ns, root_inode->i_gid));
6eaba35b	86	seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
d7c4a5f1 IK	87	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	88	seq_printf(m, ",minproto=%d", sbi->min_proto);
	89	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	90
a92daf6b	91	if (autofs_type_offset(sbi->type))
34ca959c	92	seq_printf(m, ",offset");
a92daf6b	93	else if (autofs_type_direct(sbi->type))
34ca959c IK	94	seq_printf(m, ",direct");
	95	else
	96	seq_printf(m, ",indirect");
c83aa55d SK	97	#ifdef CONFIG_CHECKPOINT_RESTORE
	98	if (sbi->pipe)
	99	seq_printf(m, ",pipe_ino=%ld", sbi->pipe->f_inode->i_ino);
	100	else
	101	seq_printf(m, ",pipe_ino=-1");
	102	#endif
d7c4a5f1 IK	103	return 0;
	104	}
	105
292c5ee8 AV	106	static void autofs4_evict_inode(struct inode *inode)
292c5ee8 AV	107	{
dbd5768f	108	clear_inode(inode);
292c5ee8 AV	109	kfree(inode->i_private);
	110	}
	111
ee9b6d61	112	static const struct super_operations autofs4_sops = {
1da177e4	113	.statfs = simple_statfs,
d7c4a5f1	114	.show_options = autofs4_show_options,
292c5ee8	115	.evict_inode = autofs4_evict_inode,
1da177e4 LT	116	};
1da177e4 LT	117
34ca959c IK	118	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	119	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	120
a447c093	121	static const match_table_t tokens = {
1da177e4 LT	122	{Opt_fd, "fd=%u"},
	123	{Opt_uid, "uid=%u"},
	124	{Opt_gid, "gid=%u"},
	125	{Opt_pgrp, "pgrp=%u"},
	126	{Opt_minproto, "minproto=%u"},
	127	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	128	{Opt_indirect, "indirect"},
	129	{Opt_direct, "direct"},
	130	{Opt_offset, "offset"},
1da177e4 LT	131	{Opt_err, NULL}
	132	};
	133
45634cd8	134	static int parse_options(char options, int pipefd, kuid_t uid, kgid_t gid,
6eaba35b SB	135	int pgrp, bool pgrp_set, unsigned int *type,
6eaba35b SB	136	int minproto, int maxproto)
1da177e4 LT	137	{
	138	char *p;
	139	substring_t args[MAX_OPT_ARGS];
	140	int option;
	141
0eb790e3 DH	142	*uid = current_uid();
0eb790e3 DH	143	*gid = current_gid();
1da177e4 LT	144
	145	*minproto = AUTOFS_MIN_PROTO_VERSION;
	146	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	147
	148	*pipefd = -1;
	149
	150	if (!options)
	151	return 1;
	152
	153	while ((p = strsep(&options, ",")) != NULL) {
	154	int token;
	155	if (!*p)
	156	continue;
	157
	158	token = match_token(p, tokens, args);
	159	switch (token) {
	160	case Opt_fd:
	161	if (match_int(args, pipefd))
	162	return 1;
	163	break;
	164	case Opt_uid:
	165	if (match_int(args, &option))
	166	return 1;
45634cd8 EB	167	*uid = make_kuid(current_user_ns(), option);
	168	if (!uid_valid(*uid))
	169	return 1;
1da177e4 LT	170	break;
	171	case Opt_gid:
	172	if (match_int(args, &option))
	173	return 1;
45634cd8 EB	174	*gid = make_kgid(current_user_ns(), option);
	175	if (!gid_valid(*gid))
	176	return 1;
1da177e4 LT	177	break;
	178	case Opt_pgrp:
	179	if (match_int(args, &option))
	180	return 1;
	181	*pgrp = option;
6eaba35b	182	*pgrp_set = true;
1da177e4 LT	183	break;
	184	case Opt_minproto:
	185	if (match_int(args, &option))
	186	return 1;
	187	*minproto = option;
	188	break;
	189	case Opt_maxproto:
	190	if (match_int(args, &option))
	191	return 1;
	192	*maxproto = option;
	193	break;
34ca959c	194	case Opt_indirect:
a92daf6b	195	set_autofs_type_indirect(type);
34ca959c IK	196	break;
34ca959c IK	197	case Opt_direct:
a92daf6b	198	set_autofs_type_direct(type);
34ca959c IK	199	break;
34ca959c IK	200	case Opt_offset:
a92daf6b	201	set_autofs_type_offset(type);
34ca959c	202	break;
1da177e4 LT	203	default:
	204	return 1;
	205	}
	206	}
	207	return (*pipefd < 0);
	208	}
	209
1da177e4 LT	210	int autofs4_fill_super(struct super_block s, void data, int silent)
	211	{
	212	struct inode * root_inode;
	213	struct dentry * root;
	214	struct file * pipe;
	215	int pipefd;
	216	struct autofs_sb_info *sbi;
	217	struct autofs_info *ino;
571ff473	218	int pgrp = 0;
6eaba35b	219	bool pgrp_set = false;
da29b754	220	int ret = -EINVAL;
1da177e4	221
b63d50c4	222	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	223	if (!sbi)
da29b754	224	return -ENOMEM;
1da177e4 LT	225	DPRINTK("starting up, sbi = %p",sbi);
1da177e4 LT	226
1da177e4 LT	227	s->s_fs_info = sbi;
1da177e4 LT	228	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	229	sbi->pipefd = -1;
ba8df43c IK	230	sbi->pipe = NULL;
ba8df43c IK	231	sbi->catatonic = 1;
1da177e4	232	sbi->exp_timeout = 0;
6eaba35b	233	sbi->oz_pgrp = NULL;
1da177e4 LT	234	sbi->sb = s;
	235	sbi->version = 0;
	236	sbi->sub_version = 0;
a92daf6b	237	set_autofs_type_indirect(&sbi->type);
d7c4a5f1 IK	238	sbi->min_proto = 0;
d7c4a5f1 IK	239	sbi->max_proto = 0;
1d5599e3	240	mutex_init(&sbi->wq_mutex);
d668dc56	241	mutex_init(&sbi->pipe_mutex);
3a9720ce	242	spin_lock_init(&sbi->fs_lock);
1da177e4	243	sbi->queues = NULL;
5f6f4f28	244	spin_lock_init(&sbi->lookup_lock);
25767378	245	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	246	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	247	s->s_blocksize = 1024;
	248	s->s_blocksize_bits = 10;
	249	s->s_magic = AUTOFS_SUPER_MAGIC;
	250	s->s_op = &autofs4_sops;
b650c858	251	s->s_d_op = &autofs4_dentry_operations;
1da177e4 LT	252	s->s_time_gran = 1;
	253
	254	/*
	255	* Get the root inode and dentry, but defer checking for errors.
	256	*/
26e6c910	257	ino = autofs4_new_ino(sbi);
da29b754 RX	258	if (!ino) {
da29b754 RX	259	ret = -ENOMEM;
1da177e4	260	goto fail_free;
da29b754	261	}
726a5e06	262	root_inode = autofs4_get_inode(s, S_IFDIR \| 0755);
48fde701	263	root = d_make_root(root_inode);
1da177e4	264	if (!root)
48fde701	265	goto fail_ino;
34ca959c IK	266	pipe = NULL;
34ca959c IK	267
34ca959c	268	root->d_fsdata = ino;
1da177e4 LT	269
1da177e4 LT	270	/* Can this call block? */
d78e53c8	271	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
6eaba35b SB	272	&pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
6eaba35b SB	273	&sbi->max_proto)) {
1da177e4 LT	274	printk("autofs: called with bogus options\n");
	275	goto fail_dput;
	276	}
	277
6eaba35b SB	278	if (pgrp_set) {
	279	sbi->oz_pgrp = find_get_pid(pgrp);
	280	if (!sbi->oz_pgrp) {
	281	pr_warn("autofs: could not find process group %d\n",
	282	pgrp);
	283	goto fail_dput;
	284	}
	285	} else {
	286	sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
	287	}
	288
b650c858	289	if (autofs_type_trigger(sbi->type))
b5b80177	290	__managed_dentry_set_managed(root);
10584211	291
34ca959c	292	root_inode->i_fop = &autofs4_root_operations;
e61da20a	293	root_inode->i_op = &autofs4_dir_inode_operations;
34ca959c	294
1da177e4	295	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	296	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	297	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	298	printk("autofs: kernel does not match daemon version "
1da177e4 LT	299	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	300	sbi->min_proto, sbi->max_proto,
1da177e4 LT	301	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	302	goto fail_dput;
	303	}
	304
d7c4a5f1 IK	305	/* Establish highest kernel protocol version */
	306	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	307	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	308	else
	309	sbi->version = sbi->max_proto;
1da177e4 LT	310	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
1da177e4 LT	311
6eaba35b	312	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, pid_nr(sbi->oz_pgrp));
1da177e4	313	pipe = fget(pipefd);
6eaba35b	314
d78e53c8	315	if (!pipe) {
1da177e4 LT	316	printk("autofs: could not open pipe file descriptor\n");
	317	goto fail_dput;
	318	}
da29b754 RX	319	ret = autofs_prepare_pipe(pipe);
da29b754 RX	320	if (ret < 0)
1da177e4 LT	321	goto fail_fput;
1da177e4 LT	322	sbi->pipe = pipe;
d7c4a5f1	323	sbi->pipefd = pipefd;
ba8df43c	324	sbi->catatonic = 0;
1da177e4 LT	325
	326	/*
	327	* Success! Install the root dentry now to indicate completion.
	328	*/
	329	s->s_root = root;
	330	return 0;
	331
	332	/*
	333	* Failure ... clean up.
	334	*/
	335	fail_fput:
	336	printk("autofs: pipe file descriptor does not contain proper ops\n");
	337	fput(pipe);
	338	/* fall through */
	339	fail_dput:
	340	dput(root);
	341	goto fail_free;
34ca959c IK	342	fail_ino:
34ca959c IK	343	kfree(ino);
1da177e4	344	fail_free:
6eaba35b	345	put_pid(sbi->oz_pgrp);
1da177e4	346	kfree(sbi);
ba8df43c	347	s->s_fs_info = NULL;
da29b754	348	return ret;
1da177e4 LT	349	}
1da177e4 LT	350
030a8ba4	351	struct inode autofs4_get_inode(struct super_block sb, umode_t mode)
1da177e4 LT	352	{
	353	struct inode *inode = new_inode(sb);
	354
	355	if (inode == NULL)
	356	return NULL;
	357
09f12c03	358	inode->i_mode = mode;
1da177e4	359	if (sb->s_root) {
2b0143b5 DH	360	inode->i_uid = d_inode(sb->s_root)->i_uid;
2b0143b5 DH	361	inode->i_gid = d_inode(sb->s_root)->i_gid;
1da177e4	362	}
1da177e4	363	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
85fe4025	364	inode->i_ino = get_next_ino();
1da177e4	365
09f12c03	366	if (S_ISDIR(mode)) {
bfe86848	367	set_nlink(inode, 2);
1da177e4 LT	368	inode->i_op = &autofs4_dir_inode_operations;
1da177e4 LT	369	inode->i_fop = &autofs4_dir_operations;
09f12c03	370	} else if (S_ISLNK(mode)) {
1da177e4 LT	371	inode->i_op = &autofs4_symlink_inode_operations;
	372	}
	373
	374	return inode;
	375	}