[linux-2.6-block.git] / fs / autofs4 / 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;

	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\n");
	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\n", 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)) {
		AUTOFS_ERROR("called with bogus options\n");
		goto fail_dput;
	}

	if (pgrp_set) {
		sbi->oz_pgrp = find_get_pid(pgrp);
		if (!sbi->oz_pgrp) {
			AUTOFS_ERROR("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) {
		AUTOFS_ERROR("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\n", pipefd, pid_nr(sbi->oz_pgrp));
	pipe = fget(pipefd);

	if (!pipe) {
		AUTOFS_ERROR("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:
	AUTOFS_ERROR("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
e9a7c2f1 IK	1	/*
	2	* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
	3	* Copyright 2005-2006 Ian Kent <raven@themaw.net>
1da177e4 LT	4	*
	5	* This file is part of the Linux kernel and is made available under
	6	* the terms of the GNU General Public License, version 2, or at your
	7	* option, any later version, incorporated herein by reference.
e9a7c2f1	8	*/
1da177e4 LT	9
	10	#include <linux/kernel.h>
	11	#include <linux/slab.h>
	12	#include <linux/file.h>
d7c4a5f1	13	#include <linux/seq_file.h>
1da177e4 LT	14	#include <linux/pagemap.h>
	15	#include <linux/parser.h>
	16	#include <linux/bitops.h>
e18fa700	17	#include <linux/magic.h>
1da177e4 LT	18	#include "autofs_i.h"
	19	#include <linux/module.h>
	20
26e6c910	21	struct autofs_info autofs4_new_ino(struct autofs_sb_info sbi)
1da177e4	22	{
e9a7c2f1 IK	23	struct autofs_info *ino;
	24
	25	ino = kzalloc(sizeof(*ino), GFP_KERNEL);
26e6c910	26	if (ino) {
25767378 IK	27	INIT_LIST_HEAD(&ino->active);
25767378 IK	28	INIT_LIST_HEAD(&ino->expiring);
26e6c910 AV	29	ino->last_used = jiffies;
26e6c910 AV	30	ino->sbi = sbi;
25767378	31	}
26e6c910 AV	32	return ino;
26e6c910 AV	33	}
f50b6f86	34
26e6c910 AV	35	void autofs4_clean_ino(struct autofs_info *ino)
26e6c910 AV	36	{
45634cd8 EB	37	ino->uid = GLOBAL_ROOT_UID;
45634cd8 EB	38	ino->gid = GLOBAL_ROOT_GID;
1da177e4	39	ino->last_used = jiffies;
1da177e4 LT	40	}
	41
	42	void autofs4_free_ino(struct autofs_info *ino)
	43	{
1da177e4 LT	44	kfree(ino);
	45	}
	46
6ce31523	47	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	48	{
	49	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	50
ba8df43c IK	51	/*
	52	* In the event of a failure in get_sb_nodev the superblock
	53	* info is not present so nothing else has been setup, so
c949d4eb JK	54	* just call kill_anon_super when we are called from
c949d4eb JK	55	* deactivate_super.
ba8df43c	56	*/
6eaba35b SB	57	if (sbi) {
6eaba35b SB	58	/* Free wait queues, close pipe */
baa40671	59	autofs4_catatonic_mode(sbi);
6eaba35b SB	60	put_pid(sbi->oz_pgrp);
6eaba35b SB	61	}
1da177e4	62
90967c87	63	DPRINTK("shutting down\n");
5b7e934d	64	kill_litter_super(sb);
baa40671 AV	65	if (sbi)
baa40671 AV	66	kfree_rcu(sbi, rcu);
1da177e4 LT	67	}
1da177e4 LT	68
34c80b1d	69	static int autofs4_show_options(struct seq_file m, struct dentry root)
d7c4a5f1	70	{
34c80b1d	71	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
2b0143b5	72	struct inode *root_inode = d_inode(root->d_sb->s_root);
d7c4a5f1 IK	73
	74	if (!sbi)
	75	return 0;
	76
	77	seq_printf(m, ",fd=%d", sbi->pipefd);
45634cd8 EB	78	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
	79	seq_printf(m, ",uid=%u",
	80	from_kuid_munged(&init_user_ns, root_inode->i_uid));
	81	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
	82	seq_printf(m, ",gid=%u",
	83	from_kgid_munged(&init_user_ns, root_inode->i_gid));
6eaba35b	84	seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
d7c4a5f1 IK	85	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	86	seq_printf(m, ",minproto=%d", sbi->min_proto);
	87	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	88
a92daf6b	89	if (autofs_type_offset(sbi->type))
34ca959c	90	seq_printf(m, ",offset");
a92daf6b	91	else if (autofs_type_direct(sbi->type))
34ca959c IK	92	seq_printf(m, ",direct");
	93	else
	94	seq_printf(m, ",indirect");
c83aa55d SK	95	#ifdef CONFIG_CHECKPOINT_RESTORE
	96	if (sbi->pipe)
	97	seq_printf(m, ",pipe_ino=%ld", sbi->pipe->f_inode->i_ino);
	98	else
	99	seq_printf(m, ",pipe_ino=-1");
	100	#endif
d7c4a5f1 IK	101	return 0;
	102	}
	103
292c5ee8 AV	104	static void autofs4_evict_inode(struct inode *inode)
292c5ee8 AV	105	{
dbd5768f	106	clear_inode(inode);
292c5ee8 AV	107	kfree(inode->i_private);
	108	}
	109
ee9b6d61	110	static const struct super_operations autofs4_sops = {
1da177e4	111	.statfs = simple_statfs,
d7c4a5f1	112	.show_options = autofs4_show_options,
292c5ee8	113	.evict_inode = autofs4_evict_inode,
1da177e4 LT	114	};
1da177e4 LT	115
34ca959c IK	116	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	117	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	118
a447c093	119	static const match_table_t tokens = {
1da177e4 LT	120	{Opt_fd, "fd=%u"},
	121	{Opt_uid, "uid=%u"},
	122	{Opt_gid, "gid=%u"},
	123	{Opt_pgrp, "pgrp=%u"},
	124	{Opt_minproto, "minproto=%u"},
	125	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	126	{Opt_indirect, "indirect"},
	127	{Opt_direct, "direct"},
	128	{Opt_offset, "offset"},
1da177e4 LT	129	{Opt_err, NULL}
	130	};
	131
45634cd8	132	static int parse_options(char options, int pipefd, kuid_t uid, kgid_t gid,
6eaba35b SB	133	int pgrp, bool pgrp_set, unsigned int *type,
6eaba35b SB	134	int minproto, int maxproto)
1da177e4 LT	135	{
	136	char *p;
	137	substring_t args[MAX_OPT_ARGS];
	138	int option;
	139
0eb790e3 DH	140	*uid = current_uid();
0eb790e3 DH	141	*gid = current_gid();
1da177e4 LT	142
	143	*minproto = AUTOFS_MIN_PROTO_VERSION;
	144	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	145
	146	*pipefd = -1;
	147
	148	if (!options)
	149	return 1;
	150
	151	while ((p = strsep(&options, ",")) != NULL) {
	152	int token;
e9a7c2f1	153
1da177e4 LT	154	if (!*p)
	155	continue;
	156
	157	token = match_token(p, tokens, args);
	158	switch (token) {
	159	case Opt_fd:
	160	if (match_int(args, pipefd))
	161	return 1;
	162	break;
	163	case Opt_uid:
	164	if (match_int(args, &option))
	165	return 1;
45634cd8 EB	166	*uid = make_kuid(current_user_ns(), option);
	167	if (!uid_valid(*uid))
	168	return 1;
1da177e4 LT	169	break;
	170	case Opt_gid:
	171	if (match_int(args, &option))
	172	return 1;
45634cd8 EB	173	*gid = make_kgid(current_user_ns(), option);
	174	if (!gid_valid(*gid))
	175	return 1;
1da177e4 LT	176	break;
	177	case Opt_pgrp:
	178	if (match_int(args, &option))
	179	return 1;
	180	*pgrp = option;
6eaba35b	181	*pgrp_set = true;
1da177e4 LT	182	break;
	183	case Opt_minproto:
	184	if (match_int(args, &option))
	185	return 1;
	186	*minproto = option;
	187	break;
	188	case Opt_maxproto:
	189	if (match_int(args, &option))
	190	return 1;
	191	*maxproto = option;
	192	break;
34ca959c	193	case Opt_indirect:
a92daf6b	194	set_autofs_type_indirect(type);
34ca959c IK	195	break;
34ca959c IK	196	case Opt_direct:
a92daf6b	197	set_autofs_type_direct(type);
34ca959c IK	198	break;
34ca959c IK	199	case Opt_offset:
a92daf6b	200	set_autofs_type_offset(type);
34ca959c	201	break;
1da177e4 LT	202	default:
	203	return 1;
	204	}
	205	}
	206	return (*pipefd < 0);
	207	}
	208
1da177e4 LT	209	int autofs4_fill_super(struct super_block s, void data, int silent)
1da177e4 LT	210	{
e9a7c2f1 IK	211	struct inode *root_inode;
	212	struct dentry *root;
	213	struct file *pipe;
1da177e4 LT	214	int pipefd;
	215	struct autofs_sb_info *sbi;
	216	struct autofs_info *ino;
571ff473	217	int pgrp = 0;
6eaba35b	218	bool pgrp_set = false;
da29b754	219	int ret = -EINVAL;
1da177e4	220
b63d50c4	221	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	222	if (!sbi)
da29b754	223	return -ENOMEM;
90967c87	224	DPRINTK("starting up, sbi = %p\n", sbi);
1da177e4	225
1da177e4 LT	226	s->s_fs_info = sbi;
1da177e4 LT	227	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	228	sbi->pipefd = -1;
ba8df43c IK	229	sbi->pipe = NULL;
ba8df43c IK	230	sbi->catatonic = 1;
1da177e4	231	sbi->exp_timeout = 0;
6eaba35b	232	sbi->oz_pgrp = NULL;
1da177e4 LT	233	sbi->sb = s;
	234	sbi->version = 0;
	235	sbi->sub_version = 0;
a92daf6b	236	set_autofs_type_indirect(&sbi->type);
d7c4a5f1 IK	237	sbi->min_proto = 0;
d7c4a5f1 IK	238	sbi->max_proto = 0;
1d5599e3	239	mutex_init(&sbi->wq_mutex);
d668dc56	240	mutex_init(&sbi->pipe_mutex);
3a9720ce	241	spin_lock_init(&sbi->fs_lock);
1da177e4	242	sbi->queues = NULL;
5f6f4f28	243	spin_lock_init(&sbi->lookup_lock);
25767378	244	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	245	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	246	s->s_blocksize = 1024;
	247	s->s_blocksize_bits = 10;
	248	s->s_magic = AUTOFS_SUPER_MAGIC;
	249	s->s_op = &autofs4_sops;
b650c858	250	s->s_d_op = &autofs4_dentry_operations;
1da177e4 LT	251	s->s_time_gran = 1;
	252
	253	/*
	254	* Get the root inode and dentry, but defer checking for errors.
	255	*/
26e6c910	256	ino = autofs4_new_ino(sbi);
da29b754 RX	257	if (!ino) {
da29b754 RX	258	ret = -ENOMEM;
1da177e4	259	goto fail_free;
da29b754	260	}
726a5e06	261	root_inode = autofs4_get_inode(s, S_IFDIR \| 0755);
48fde701	262	root = d_make_root(root_inode);
1da177e4	263	if (!root)
48fde701	264	goto fail_ino;
34ca959c IK	265	pipe = NULL;
34ca959c IK	266
34ca959c	267	root->d_fsdata = ino;
1da177e4 LT	268
1da177e4 LT	269	/* Can this call block? */
d78e53c8	270	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
6eaba35b SB	271	&pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
6eaba35b SB	272	&sbi->max_proto)) {
90967c87	273	AUTOFS_ERROR("called with bogus options\n");
1da177e4 LT	274	goto fail_dput;
	275	}
	276
6eaba35b SB	277	if (pgrp_set) {
	278	sbi->oz_pgrp = find_get_pid(pgrp);
	279	if (!sbi->oz_pgrp) {
90967c87	280	AUTOFS_ERROR("could not find process group %d\n",
6eaba35b SB	281	pgrp);
	282	goto fail_dput;
	283	}
	284	} else {
	285	sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
	286	}
	287
b650c858	288	if (autofs_type_trigger(sbi->type))
b5b80177	289	__managed_dentry_set_managed(root);
10584211	290
34ca959c	291	root_inode->i_fop = &autofs4_root_operations;
e61da20a	292	root_inode->i_op = &autofs4_dir_inode_operations;
34ca959c	293
1da177e4	294	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	295	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	296	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
cab49f9e	297	AUTOFS_ERROR("kernel does not match daemon version "
90967c87	298	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	299	sbi->min_proto, sbi->max_proto,
1da177e4 LT	300	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	301	goto fail_dput;
	302	}
	303
d7c4a5f1 IK	304	/* Establish highest kernel protocol version */
	305	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	306	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	307	else
	308	sbi->version = sbi->max_proto;
1da177e4 LT	309	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
1da177e4 LT	310
90967c87	311	DPRINTK("pipe fd = %d, pgrp = %u\n", pipefd, pid_nr(sbi->oz_pgrp));
1da177e4	312	pipe = fget(pipefd);
6eaba35b	313
d78e53c8	314	if (!pipe) {
90967c87	315	AUTOFS_ERROR("could not open pipe file descriptor\n");
1da177e4 LT	316	goto fail_dput;
1da177e4 LT	317	}
da29b754 RX	318	ret = autofs_prepare_pipe(pipe);
da29b754 RX	319	if (ret < 0)
1da177e4 LT	320	goto fail_fput;
1da177e4 LT	321	sbi->pipe = pipe;
d7c4a5f1	322	sbi->pipefd = pipefd;
ba8df43c	323	sbi->catatonic = 0;
1da177e4 LT	324
	325	/*
	326	* Success! Install the root dentry now to indicate completion.
	327	*/
	328	s->s_root = root;
	329	return 0;
0266725a	330
1da177e4 LT	331	/*
	332	* Failure ... clean up.
	333	*/
	334	fail_fput:
90967c87	335	AUTOFS_ERROR("pipe file descriptor does not contain proper ops\n");
1da177e4 LT	336	fput(pipe);
	337	/* fall through */
	338	fail_dput:
	339	dput(root);
	340	goto fail_free;
34ca959c IK	341	fail_ino:
34ca959c IK	342	kfree(ino);
1da177e4	343	fail_free:
6eaba35b	344	put_pid(sbi->oz_pgrp);
1da177e4	345	kfree(sbi);
ba8df43c	346	s->s_fs_info = NULL;
da29b754	347	return ret;
1da177e4 LT	348	}
1da177e4 LT	349
030a8ba4	350	struct inode autofs4_get_inode(struct super_block sb, umode_t mode)
1da177e4 LT	351	{
	352	struct inode *inode = new_inode(sb);
	353
	354	if (inode == NULL)
	355	return NULL;
	356
09f12c03	357	inode->i_mode = mode;
1da177e4	358	if (sb->s_root) {
2b0143b5 DH	359	inode->i_uid = d_inode(sb->s_root)->i_uid;
2b0143b5 DH	360	inode->i_gid = d_inode(sb->s_root)->i_gid;
1da177e4	361	}
1da177e4	362	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
85fe4025	363	inode->i_ino = get_next_ino();
1da177e4	364
09f12c03	365	if (S_ISDIR(mode)) {
bfe86848	366	set_nlink(inode, 2);
1da177e4 LT	367	inode->i_op = &autofs4_dir_inode_operations;
1da177e4 LT	368	inode->i_fop = &autofs4_dir_operations;
09f12c03	369	} else if (S_ISLNK(mode)) {
1da177e4 LT	370	inode->i_op = &autofs4_symlink_inode_operations;
	371	}
	372
	373	return inode;
	374	}