[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>

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");

	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 <[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
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");
	97
d7c4a5f1 IK	98	return 0;
	99	}
	100
292c5ee8 AV	101	static void autofs4_evict_inode(struct inode *inode)
292c5ee8 AV	102	{
dbd5768f	103	clear_inode(inode);
292c5ee8 AV	104	kfree(inode->i_private);
	105	}
	106
ee9b6d61	107	static const struct super_operations autofs4_sops = {
1da177e4	108	.statfs = simple_statfs,
d7c4a5f1	109	.show_options = autofs4_show_options,
292c5ee8	110	.evict_inode = autofs4_evict_inode,
1da177e4 LT	111	};
1da177e4 LT	112
34ca959c IK	113	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	114	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	115
a447c093	116	static const match_table_t tokens = {
1da177e4 LT	117	{Opt_fd, "fd=%u"},
	118	{Opt_uid, "uid=%u"},
	119	{Opt_gid, "gid=%u"},
	120	{Opt_pgrp, "pgrp=%u"},
	121	{Opt_minproto, "minproto=%u"},
	122	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	123	{Opt_indirect, "indirect"},
	124	{Opt_direct, "direct"},
	125	{Opt_offset, "offset"},
1da177e4 LT	126	{Opt_err, NULL}
	127	};
	128
45634cd8	129	static int parse_options(char options, int pipefd, kuid_t uid, kgid_t gid,
6eaba35b SB	130	int pgrp, bool pgrp_set, unsigned int *type,
6eaba35b SB	131	int minproto, int maxproto)
1da177e4 LT	132	{
	133	char *p;
	134	substring_t args[MAX_OPT_ARGS];
	135	int option;
	136
0eb790e3 DH	137	*uid = current_uid();
0eb790e3 DH	138	*gid = current_gid();
1da177e4 LT	139
	140	*minproto = AUTOFS_MIN_PROTO_VERSION;
	141	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	142
	143	*pipefd = -1;
	144
	145	if (!options)
	146	return 1;
	147
	148	while ((p = strsep(&options, ",")) != NULL) {
	149	int token;
	150	if (!*p)
	151	continue;
	152
	153	token = match_token(p, tokens, args);
	154	switch (token) {
	155	case Opt_fd:
	156	if (match_int(args, pipefd))
	157	return 1;
	158	break;
	159	case Opt_uid:
	160	if (match_int(args, &option))
	161	return 1;
45634cd8 EB	162	*uid = make_kuid(current_user_ns(), option);
	163	if (!uid_valid(*uid))
	164	return 1;
1da177e4 LT	165	break;
	166	case Opt_gid:
	167	if (match_int(args, &option))
	168	return 1;
45634cd8 EB	169	*gid = make_kgid(current_user_ns(), option);
	170	if (!gid_valid(*gid))
	171	return 1;
1da177e4 LT	172	break;
	173	case Opt_pgrp:
	174	if (match_int(args, &option))
	175	return 1;
	176	*pgrp = option;
6eaba35b	177	*pgrp_set = true;
1da177e4 LT	178	break;
	179	case Opt_minproto:
	180	if (match_int(args, &option))
	181	return 1;
	182	*minproto = option;
	183	break;
	184	case Opt_maxproto:
	185	if (match_int(args, &option))
	186	return 1;
	187	*maxproto = option;
	188	break;
34ca959c	189	case Opt_indirect:
a92daf6b	190	set_autofs_type_indirect(type);
34ca959c IK	191	break;
34ca959c IK	192	case Opt_direct:
a92daf6b	193	set_autofs_type_direct(type);
34ca959c IK	194	break;
34ca959c IK	195	case Opt_offset:
a92daf6b	196	set_autofs_type_offset(type);
34ca959c	197	break;
1da177e4 LT	198	default:
	199	return 1;
	200	}
	201	}
	202	return (*pipefd < 0);
	203	}
	204
1da177e4 LT	205	int autofs4_fill_super(struct super_block s, void data, int silent)
	206	{
	207	struct inode * root_inode;
	208	struct dentry * root;
	209	struct file * pipe;
	210	int pipefd;
	211	struct autofs_sb_info *sbi;
	212	struct autofs_info *ino;
571ff473	213	int pgrp = 0;
6eaba35b	214	bool pgrp_set = false;
da29b754	215	int ret = -EINVAL;
1da177e4	216
b63d50c4	217	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	218	if (!sbi)
da29b754	219	return -ENOMEM;
1da177e4 LT	220	DPRINTK("starting up, sbi = %p",sbi);
1da177e4 LT	221
1da177e4 LT	222	s->s_fs_info = sbi;
1da177e4 LT	223	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	224	sbi->pipefd = -1;
ba8df43c IK	225	sbi->pipe = NULL;
ba8df43c IK	226	sbi->catatonic = 1;
1da177e4	227	sbi->exp_timeout = 0;
6eaba35b	228	sbi->oz_pgrp = NULL;
1da177e4 LT	229	sbi->sb = s;
	230	sbi->version = 0;
	231	sbi->sub_version = 0;
a92daf6b	232	set_autofs_type_indirect(&sbi->type);
d7c4a5f1 IK	233	sbi->min_proto = 0;
d7c4a5f1 IK	234	sbi->max_proto = 0;
1d5599e3	235	mutex_init(&sbi->wq_mutex);
d668dc56	236	mutex_init(&sbi->pipe_mutex);
3a9720ce	237	spin_lock_init(&sbi->fs_lock);
1da177e4	238	sbi->queues = NULL;
5f6f4f28	239	spin_lock_init(&sbi->lookup_lock);
25767378	240	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	241	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	242	s->s_blocksize = 1024;
	243	s->s_blocksize_bits = 10;
	244	s->s_magic = AUTOFS_SUPER_MAGIC;
	245	s->s_op = &autofs4_sops;
b650c858	246	s->s_d_op = &autofs4_dentry_operations;
1da177e4 LT	247	s->s_time_gran = 1;
	248
	249	/*
	250	* Get the root inode and dentry, but defer checking for errors.
	251	*/
26e6c910	252	ino = autofs4_new_ino(sbi);
da29b754 RX	253	if (!ino) {
da29b754 RX	254	ret = -ENOMEM;
1da177e4	255	goto fail_free;
da29b754	256	}
726a5e06	257	root_inode = autofs4_get_inode(s, S_IFDIR \| 0755);
48fde701	258	root = d_make_root(root_inode);
1da177e4	259	if (!root)
48fde701	260	goto fail_ino;
34ca959c IK	261	pipe = NULL;
34ca959c IK	262
34ca959c	263	root->d_fsdata = ino;
1da177e4 LT	264
1da177e4 LT	265	/* Can this call block? */
d78e53c8	266	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
6eaba35b SB	267	&pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
6eaba35b SB	268	&sbi->max_proto)) {
1da177e4 LT	269	printk("autofs: called with bogus options\n");
	270	goto fail_dput;
	271	}
	272
6eaba35b SB	273	if (pgrp_set) {
	274	sbi->oz_pgrp = find_get_pid(pgrp);
	275	if (!sbi->oz_pgrp) {
	276	pr_warn("autofs: could not find process group %d\n",
	277	pgrp);
	278	goto fail_dput;
	279	}
	280	} else {
	281	sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
	282	}
	283
b650c858	284	if (autofs_type_trigger(sbi->type))
b5b80177	285	__managed_dentry_set_managed(root);
10584211	286
34ca959c	287	root_inode->i_fop = &autofs4_root_operations;
e61da20a	288	root_inode->i_op = &autofs4_dir_inode_operations;
34ca959c	289
1da177e4	290	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	291	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	292	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	293	printk("autofs: kernel does not match daemon version "
1da177e4 LT	294	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	295	sbi->min_proto, sbi->max_proto,
1da177e4 LT	296	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	297	goto fail_dput;
	298	}
	299
d7c4a5f1 IK	300	/* Establish highest kernel protocol version */
	301	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	302	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	303	else
	304	sbi->version = sbi->max_proto;
1da177e4 LT	305	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
1da177e4 LT	306
6eaba35b	307	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, pid_nr(sbi->oz_pgrp));
1da177e4	308	pipe = fget(pipefd);
6eaba35b	309
d78e53c8	310	if (!pipe) {
1da177e4 LT	311	printk("autofs: could not open pipe file descriptor\n");
	312	goto fail_dput;
	313	}
da29b754 RX	314	ret = autofs_prepare_pipe(pipe);
da29b754 RX	315	if (ret < 0)
1da177e4 LT	316	goto fail_fput;
1da177e4 LT	317	sbi->pipe = pipe;
d7c4a5f1	318	sbi->pipefd = pipefd;
ba8df43c	319	sbi->catatonic = 0;
1da177e4 LT	320
	321	/*
	322	* Success! Install the root dentry now to indicate completion.
	323	*/
	324	s->s_root = root;
	325	return 0;
	326
	327	/*
	328	* Failure ... clean up.
	329	*/
	330	fail_fput:
	331	printk("autofs: pipe file descriptor does not contain proper ops\n");
	332	fput(pipe);
	333	/* fall through */
	334	fail_dput:
	335	dput(root);
	336	goto fail_free;
34ca959c IK	337	fail_ino:
34ca959c IK	338	kfree(ino);
1da177e4	339	fail_free:
6eaba35b	340	put_pid(sbi->oz_pgrp);
1da177e4	341	kfree(sbi);
ba8df43c	342	s->s_fs_info = NULL;
da29b754	343	return ret;
1da177e4 LT	344	}
1da177e4 LT	345
030a8ba4	346	struct inode autofs4_get_inode(struct super_block sb, umode_t mode)
1da177e4 LT	347	{
	348	struct inode *inode = new_inode(sb);
	349
	350	if (inode == NULL)
	351	return NULL;
	352
09f12c03	353	inode->i_mode = mode;
1da177e4	354	if (sb->s_root) {
2b0143b5 DH	355	inode->i_uid = d_inode(sb->s_root)->i_uid;
2b0143b5 DH	356	inode->i_gid = d_inode(sb->s_root)->i_gid;
1da177e4	357	}
1da177e4	358	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
85fe4025	359	inode->i_ino = get_next_ino();
1da177e4	360
09f12c03	361	if (S_ISDIR(mode)) {
bfe86848	362	set_nlink(inode, 2);
1da177e4 LT	363	inode->i_op = &autofs4_dir_inode_operations;
1da177e4 LT	364	inode->i_fop = &autofs4_dir_operations;
09f12c03	365	} else if (S_ISLNK(mode)) {
1da177e4 LT	366	inode->i_op = &autofs4_symlink_inode_operations;
	367	}
	368
	369	return inode;
	370	}