[people/ms/linux.git] / fs / autofs / inode.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
 * Copyright 2005-2006 Ian Kent <raven@themaw.net>
 */

#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/parser.h>

#include "autofs_i.h"

struct autofs_info *autofs_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;
		ino->count = 1;
	}
	return ino;
}

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

void autofs_free_ino(struct autofs_info *ino)
{
	kfree_rcu(ino, rcu);
}

void autofs_kill_sb(struct super_block *sb)
{
	struct autofs_sb_info *sbi = autofs_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 */
		autofs_catatonic_mode(sbi);
		put_pid(sbi->oz_pgrp);
	}

	pr_debug("shutting down\n");
	kill_litter_super(sb);
	if (sbi)
		kfree_rcu(sbi, rcu);
}

static int autofs_show_options(struct seq_file *m, struct dentry *root)
{
	struct autofs_sb_info *sbi = autofs_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_puts(m, ",offset");
	else if (autofs_type_direct(sbi->type))
		seq_puts(m, ",direct");
	else
		seq_puts(m, ",indirect");
	if (sbi->flags & AUTOFS_SBI_STRICTEXPIRE)
		seq_puts(m, ",strictexpire");
	if (sbi->flags & AUTOFS_SBI_IGNORE)
		seq_puts(m, ",ignore");
#ifdef CONFIG_CHECKPOINT_RESTORE
	if (sbi->pipe)
		seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino);
	else
		seq_puts(m, ",pipe_ino=-1");
#endif
	return 0;
}

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

static const struct super_operations autofs_sops = {
	.statfs		= simple_statfs,
	.show_options	= autofs_show_options,
	.evict_inode	= autofs_evict_inode,
};

enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
	Opt_indirect, Opt_direct, Opt_offset, Opt_strictexpire,
	Opt_ignore};

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_strictexpire, "strictexpire"},
	{Opt_ignore, "ignore"},
	{Opt_err, NULL}
};

static int parse_options(char *options,
			 struct inode *root, int *pgrp, bool *pgrp_set,
			 struct autofs_sb_info *sbi)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;
	int pipefd = -1;
	kuid_t uid;
	kgid_t gid;

	root->i_uid = current_uid();
	root->i_gid = current_gid();

	sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
	sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;

	sbi->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;
			sbi->pipefd = pipefd;
			break;
		case Opt_uid:
			if (match_int(args, &option))
				return 1;
			uid = make_kuid(current_user_ns(), option);
			if (!uid_valid(uid))
				return 1;
			root->i_uid = uid;
			break;
		case Opt_gid:
			if (match_int(args, &option))
				return 1;
			gid = make_kgid(current_user_ns(), option);
			if (!gid_valid(gid))
				return 1;
			root->i_gid = gid;
			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;
			sbi->min_proto = option;
			break;
		case Opt_maxproto:
			if (match_int(args, &option))
				return 1;
			sbi->max_proto = option;
			break;
		case Opt_indirect:
			set_autofs_type_indirect(&sbi->type);
			break;
		case Opt_direct:
			set_autofs_type_direct(&sbi->type);
			break;
		case Opt_offset:
			set_autofs_type_offset(&sbi->type);
			break;
		case Opt_strictexpire:
			sbi->flags |= AUTOFS_SBI_STRICTEXPIRE;
			break;
		case Opt_ignore:
			sbi->flags |= AUTOFS_SBI_IGNORE;
			break;
		default:
			return 1;
		}
	}
	return (sbi->pipefd < 0);
}

int autofs_fill_super(struct super_block *s, void *data, int silent)
{
	struct inode *root_inode;
	struct dentry *root;
	struct file *pipe;
	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;
	pr_debug("starting up, sbi = %p\n", sbi);

	s->s_fs_info = sbi;
	sbi->magic = AUTOFS_SBI_MAGIC;
	sbi->pipefd = -1;
	sbi->pipe = NULL;
	sbi->exp_timeout = 0;
	sbi->oz_pgrp = NULL;
	sbi->sb = s;
	sbi->version = 0;
	sbi->sub_version = 0;
	sbi->flags = AUTOFS_SBI_CATATONIC;
	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 = &autofs_sops;
	s->s_d_op = &autofs_dentry_operations;
	s->s_time_gran = 1;

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

	root->d_fsdata = ino;

	/* Can this call block? */
	if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
		pr_err("called with bogus options\n");
		goto fail_dput;
	}

	/* Test versions first */
	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
		pr_err("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;

	if (pgrp_set) {
		sbi->oz_pgrp = find_get_pid(pgrp);
		if (!sbi->oz_pgrp) {
			pr_err("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 = &autofs_root_operations;
	root_inode->i_op = &autofs_dir_inode_operations;

	pr_debug("pipe fd = %d, pgrp = %u\n",
		 sbi->pipefd, pid_nr(sbi->oz_pgrp));
	pipe = fget(sbi->pipefd);

	if (!pipe) {
		pr_err("could not open pipe file descriptor\n");
		goto fail_put_pid;
	}
	ret = autofs_prepare_pipe(pipe);
	if (ret < 0)
		goto fail_fput;
	sbi->pipe = pipe;
	sbi->flags &= ~AUTOFS_SBI_CATATONIC;

	/*
	 * Success! Install the root dentry now to indicate completion.
	 */
	s->s_root = root;
	return 0;

	/*
	 * Failure ... clean up.
	 */
fail_fput:
	pr_err("pipe file descriptor does not contain proper ops\n");
	fput(pipe);
fail_put_pid:
	put_pid(sbi->oz_pgrp);
fail_dput:
	dput(root);
	goto fail_free;
fail_ino:
	autofs_free_ino(ino);
fail_free:
	kfree(sbi);
	s->s_fs_info = NULL;
	return ret;
}

struct inode *autofs_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);
	inode->i_ino = get_next_ino();

	if (S_ISDIR(mode)) {
		set_nlink(inode, 2);
		inode->i_op = &autofs_dir_inode_operations;
		inode->i_fop = &autofs_dir_operations;
	} else if (S_ISLNK(mode)) {
		inode->i_op = &autofs_symlink_inode_operations;
	} else
		WARN_ON(1);

	return inode;
}
Commit	Line	Data
d6910058	1	// SPDX-License-Identifier: GPL-2.0-or-later
ebc921ca IK	2	/*
	3	* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
	4	* Copyright 2005-2006 Ian Kent <raven@themaw.net>
ebc921ca IK	5	*/
ebc921ca IK	6
ebc921ca IK	7	#include <linux/seq_file.h>
	8	#include <linux/pagemap.h>
	9	#include <linux/parser.h>
6471e938	10
ebc921ca	11	#include "autofs_i.h"
ebc921ca IK	12
	13	struct autofs_info autofs_new_ino(struct autofs_sb_info sbi)
	14	{
	15	struct autofs_info *ino;
	16
	17	ino = kzalloc(sizeof(*ino), GFP_KERNEL);
	18	if (ino) {
	19	INIT_LIST_HEAD(&ino->active);
	20	INIT_LIST_HEAD(&ino->expiring);
	21	ino->last_used = jiffies;
	22	ino->sbi = sbi;
9ccbac76	23	ino->count = 1;
ebc921ca IK	24	}
	25	return ino;
	26	}
	27
	28	void autofs_clean_ino(struct autofs_info *ino)
	29	{
	30	ino->uid = GLOBAL_ROOT_UID;
	31	ino->gid = GLOBAL_ROOT_GID;
	32	ino->last_used = jiffies;
	33	}
	34
	35	void autofs_free_ino(struct autofs_info *ino)
	36	{
ce285c26	37	kfree_rcu(ino, rcu);
ebc921ca IK	38	}
	39
	40	void autofs_kill_sb(struct super_block *sb)
	41	{
	42	struct autofs_sb_info *sbi = autofs_sbi(sb);
	43
	44	/*
	45	* In the event of a failure in get_sb_nodev the superblock
	46	* info is not present so nothing else has been setup, so
	47	* just call kill_anon_super when we are called from
	48	* deactivate_super.
	49	*/
	50	if (sbi) {
	51	/* Free wait queues, close pipe */
	52	autofs_catatonic_mode(sbi);
	53	put_pid(sbi->oz_pgrp);
	54	}
	55
	56	pr_debug("shutting down\n");
	57	kill_litter_super(sb);
	58	if (sbi)
	59	kfree_rcu(sbi, rcu);
	60	}
	61
	62	static int autofs_show_options(struct seq_file m, struct dentry root)
	63	{
	64	struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
	65	struct inode *root_inode = d_inode(root->d_sb->s_root);
	66
	67	if (!sbi)
	68	return 0;
	69
	70	seq_printf(m, ",fd=%d", sbi->pipefd);
	71	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
	72	seq_printf(m, ",uid=%u",
	73	from_kuid_munged(&init_user_ns, root_inode->i_uid));
	74	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
	75	seq_printf(m, ",gid=%u",
	76	from_kgid_munged(&init_user_ns, root_inode->i_gid));
	77	seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
	78	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	79	seq_printf(m, ",minproto=%d", sbi->min_proto);
	80	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	81
	82	if (autofs_type_offset(sbi->type))
874d22d6	83	seq_puts(m, ",offset");
ebc921ca	84	else if (autofs_type_direct(sbi->type))
874d22d6	85	seq_puts(m, ",direct");
ebc921ca	86	else
874d22d6	87	seq_puts(m, ",indirect");
f5162216	88	if (sbi->flags & AUTOFS_SBI_STRICTEXPIRE)
874d22d6	89	seq_puts(m, ",strictexpire");
60d6d04c	90	if (sbi->flags & AUTOFS_SBI_IGNORE)
874d22d6	91	seq_puts(m, ",ignore");
ebc921ca IK	92	#ifdef CONFIG_CHECKPOINT_RESTORE
	93	if (sbi->pipe)
	94	seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino);
	95	else
874d22d6	96	seq_puts(m, ",pipe_ino=-1");
ebc921ca IK	97	#endif
	98	return 0;
	99	}
	100
	101	static void autofs_evict_inode(struct inode *inode)
	102	{
	103	clear_inode(inode);
	104	kfree(inode->i_private);
	105	}
	106
	107	static const struct super_operations autofs_sops = {
	108	.statfs = simple_statfs,
	109	.show_options = autofs_show_options,
	110	.evict_inode = autofs_evict_inode,
	111	};
	112
	113	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
60d6d04c IK	114	Opt_indirect, Opt_direct, Opt_offset, Opt_strictexpire,
60d6d04c IK	115	Opt_ignore};
ebc921ca IK	116
	117	static const match_table_t tokens = {
	118	{Opt_fd, "fd=%u"},
	119	{Opt_uid, "uid=%u"},
	120	{Opt_gid, "gid=%u"},
	121	{Opt_pgrp, "pgrp=%u"},
	122	{Opt_minproto, "minproto=%u"},
	123	{Opt_maxproto, "maxproto=%u"},
	124	{Opt_indirect, "indirect"},
	125	{Opt_direct, "direct"},
	126	{Opt_offset, "offset"},
f5162216	127	{Opt_strictexpire, "strictexpire"},
60d6d04c	128	{Opt_ignore, "ignore"},
ebc921ca IK	129	{Opt_err, NULL}
	130	};
	131
9bf964c9 IK	132	static int parse_options(char *options,
	133	struct inode root, int pgrp, bool *pgrp_set,
	134	struct autofs_sb_info *sbi)
ebc921ca IK	135	{
	136	char *p;
	137	substring_t args[MAX_OPT_ARGS];
	138	int option;
9bf964c9 IK	139	int pipefd = -1;
	140	kuid_t uid;
	141	kgid_t gid;
ebc921ca	142
9bf964c9 IK	143	root->i_uid = current_uid();
9bf964c9 IK	144	root->i_gid = current_gid();
ebc921ca	145
9bf964c9 IK	146	sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
9bf964c9 IK	147	sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
ebc921ca	148
9bf964c9	149	sbi->pipefd = -1;
ebc921ca IK	150
	151	if (!options)
	152	return 1;
	153
	154	while ((p = strsep(&options, ",")) != NULL) {
	155	int token;
	156
	157	if (!*p)
	158	continue;
	159
	160	token = match_token(p, tokens, args);
	161	switch (token) {
	162	case Opt_fd:
9bf964c9	163	if (match_int(args, &pipefd))
ebc921ca	164	return 1;
9bf964c9	165	sbi->pipefd = pipefd;
ebc921ca IK	166	break;
	167	case Opt_uid:
	168	if (match_int(args, &option))
	169	return 1;
9bf964c9 IK	170	uid = make_kuid(current_user_ns(), option);
9bf964c9 IK	171	if (!uid_valid(uid))
ebc921ca	172	return 1;
9bf964c9	173	root->i_uid = uid;
ebc921ca IK	174	break;
	175	case Opt_gid:
	176	if (match_int(args, &option))
	177	return 1;
9bf964c9 IK	178	gid = make_kgid(current_user_ns(), option);
9bf964c9 IK	179	if (!gid_valid(gid))
ebc921ca	180	return 1;
9bf964c9	181	root->i_gid = gid;
ebc921ca IK	182	break;
	183	case Opt_pgrp:
	184	if (match_int(args, &option))
	185	return 1;
	186	*pgrp = option;
	187	*pgrp_set = true;
	188	break;
	189	case Opt_minproto:
	190	if (match_int(args, &option))
	191	return 1;
9bf964c9	192	sbi->min_proto = option;
ebc921ca IK	193	break;
	194	case Opt_maxproto:
	195	if (match_int(args, &option))
	196	return 1;
9bf964c9	197	sbi->max_proto = option;
ebc921ca IK	198	break;
ebc921ca IK	199	case Opt_indirect:
9bf964c9	200	set_autofs_type_indirect(&sbi->type);
ebc921ca IK	201	break;
ebc921ca IK	202	case Opt_direct:
9bf964c9	203	set_autofs_type_direct(&sbi->type);
ebc921ca IK	204	break;
ebc921ca IK	205	case Opt_offset:
9bf964c9	206	set_autofs_type_offset(&sbi->type);
ebc921ca	207	break;
f5162216 IK	208	case Opt_strictexpire:
	209	sbi->flags \|= AUTOFS_SBI_STRICTEXPIRE;
	210	break;
60d6d04c IK	211	case Opt_ignore:
	212	sbi->flags \|= AUTOFS_SBI_IGNORE;
	213	break;
ebc921ca IK	214	default:
	215	return 1;
	216	}
	217	}
9bf964c9	218	return (sbi->pipefd < 0);
ebc921ca IK	219	}
	220
	221	int autofs_fill_super(struct super_block s, void data, int silent)
	222	{
	223	struct inode *root_inode;
	224	struct dentry *root;
	225	struct file *pipe;
ebc921ca IK	226	struct autofs_sb_info *sbi;
	227	struct autofs_info *ino;
	228	int pgrp = 0;
	229	bool pgrp_set = false;
	230	int ret = -EINVAL;
	231
	232	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	233	if (!sbi)
	234	return -ENOMEM;
	235	pr_debug("starting up, sbi = %p\n", sbi);
	236
	237	s->s_fs_info = sbi;
	238	sbi->magic = AUTOFS_SBI_MAGIC;
	239	sbi->pipefd = -1;
	240	sbi->pipe = NULL;
ebc921ca IK	241	sbi->exp_timeout = 0;
	242	sbi->oz_pgrp = NULL;
	243	sbi->sb = s;
	244	sbi->version = 0;
	245	sbi->sub_version = 0;
9d8719a4	246	sbi->flags = AUTOFS_SBI_CATATONIC;
ebc921ca IK	247	set_autofs_type_indirect(&sbi->type);
	248	sbi->min_proto = 0;
	249	sbi->max_proto = 0;
	250	mutex_init(&sbi->wq_mutex);
	251	mutex_init(&sbi->pipe_mutex);
	252	spin_lock_init(&sbi->fs_lock);
	253	sbi->queues = NULL;
	254	spin_lock_init(&sbi->lookup_lock);
	255	INIT_LIST_HEAD(&sbi->active_list);
	256	INIT_LIST_HEAD(&sbi->expiring_list);
	257	s->s_blocksize = 1024;
	258	s->s_blocksize_bits = 10;
	259	s->s_magic = AUTOFS_SUPER_MAGIC;
	260	s->s_op = &autofs_sops;
	261	s->s_d_op = &autofs_dentry_operations;
	262	s->s_time_gran = 1;
	263
	264	/*
	265	* Get the root inode and dentry, but defer checking for errors.
	266	*/
	267	ino = autofs_new_ino(sbi);
	268	if (!ino) {
	269	ret = -ENOMEM;
	270	goto fail_free;
	271	}
	272	root_inode = autofs_get_inode(s, S_IFDIR \| 0755);
	273	root = d_make_root(root_inode);
f585b283 IK	274	if (!root) {
f585b283 IK	275	ret = -ENOMEM;
ebc921ca	276	goto fail_ino;
f585b283	277	}
ebc921ca IK	278	pipe = NULL;
	279
	280	root->d_fsdata = ino;
	281
	282	/* Can this call block? */
9bf964c9	283	if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
ebc921ca IK	284	pr_err("called with bogus options\n");
	285	goto fail_dput;
	286	}
	287
	288	/* Test versions first */
	289	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
	290	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
	291	pr_err("kernel does not match daemon version "
	292	"daemon (%d, %d) kernel (%d, %d)\n",
	293	sbi->min_proto, sbi->max_proto,
	294	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	295	goto fail_dput;
	296	}
	297
	298	/* Establish highest kernel protocol version */
	299	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	300	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	301	else
	302	sbi->version = sbi->max_proto;
	303	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	304
	305	if (pgrp_set) {
	306	sbi->oz_pgrp = find_get_pid(pgrp);
	307	if (!sbi->oz_pgrp) {
	308	pr_err("could not find process group %d\n",
	309	pgrp);
	310	goto fail_dput;
	311	}
	312	} else {
	313	sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
	314	}
	315
	316	if (autofs_type_trigger(sbi->type))
	317	__managed_dentry_set_managed(root);
	318
	319	root_inode->i_fop = &autofs_root_operations;
	320	root_inode->i_op = &autofs_dir_inode_operations;
	321
9bf964c9 IK	322	pr_debug("pipe fd = %d, pgrp = %u\n",
	323	sbi->pipefd, pid_nr(sbi->oz_pgrp));
	324	pipe = fget(sbi->pipefd);
ebc921ca IK	325
	326	if (!pipe) {
	327	pr_err("could not open pipe file descriptor\n");
	328	goto fail_put_pid;
	329	}
	330	ret = autofs_prepare_pipe(pipe);
	331	if (ret < 0)
	332	goto fail_fput;
	333	sbi->pipe = pipe;
9d8719a4	334	sbi->flags &= ~AUTOFS_SBI_CATATONIC;
ebc921ca IK	335
	336	/*
	337	* Success! Install the root dentry now to indicate completion.
	338	*/
	339	s->s_root = root;
	340	return 0;
	341
	342	/*
	343	* Failure ... clean up.
	344	*/
	345	fail_fput:
	346	pr_err("pipe file descriptor does not contain proper ops\n");
	347	fput(pipe);
	348	fail_put_pid:
	349	put_pid(sbi->oz_pgrp);
	350	fail_dput:
	351	dput(root);
	352	goto fail_free;
	353	fail_ino:
	354	autofs_free_ino(ino);
	355	fail_free:
	356	kfree(sbi);
	357	s->s_fs_info = NULL;
	358	return ret;
	359	}
	360
	361	struct inode autofs_get_inode(struct super_block sb, umode_t mode)
	362	{
	363	struct inode *inode = new_inode(sb);
	364
	365	if (inode == NULL)
	366	return NULL;
	367
	368	inode->i_mode = mode;
	369	if (sb->s_root) {
	370	inode->i_uid = d_inode(sb->s_root)->i_uid;
	371	inode->i_gid = d_inode(sb->s_root)->i_gid;
	372	}
	373	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
	374	inode->i_ino = get_next_ino();
	375
	376	if (S_ISDIR(mode)) {
	377	set_nlink(inode, 2);
	378	inode->i_op = &autofs_dir_inode_operations;
	379	inode->i_fop = &autofs_dir_operations;
	380	} else if (S_ISLNK(mode)) {
	381	inode->i_op = &autofs_symlink_inode_operations;
	382	} else
	383	WARN_ON(1);
	384
	385	return inode;
	386	}