[linux-2.6-block.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_direct,
	Opt_fd,
	Opt_gid,
	Opt_ignore,
	Opt_indirect,
	Opt_maxproto,
	Opt_minproto,
	Opt_offset,
	Opt_pgrp,
	Opt_strictexpire,
	Opt_uid,
};

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 autofs_parse_fd(struct autofs_sb_info *sbi, int fd)
{
	struct file *pipe;
	int ret;

	pipe = fget(fd);
	if (!pipe) {
		pr_err("could not open pipe file descriptor\n");
		return -EBADF;
	}

	ret = autofs_check_pipe(pipe);
	if (ret < 0) {
		pr_err("Invalid/unusable pipe\n");
		fput(pipe);
		return -EBADF;
	}

	if (sbi->pipe)
		fput(sbi->pipe);

	sbi->pipefd = fd;
	sbi->pipe = pipe;

	return 0;
}

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

	token = match_token(optstr, tokens, args);
	switch (token) {
	case Opt_fd:
		if (match_int(args, &pipefd))
			return 1;
		ret = autofs_parse_fd(sbi, pipefd);
		if (ret)
			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;
		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;
	}

	return 0;
}

static int parse_options(char *options,
			 struct inode *root, int *pgrp, bool *pgrp_set,
			 struct autofs_sb_info *sbi)
{
	char *p;

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

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		if (!*p)
			continue;

		if (autofs_parse_param(p, root, pgrp, pgrp_set, sbi))
			return 1;
	}

	return (sbi->pipefd < 0);
}

static struct autofs_sb_info *autofs_alloc_sbi(void)
{
	struct autofs_sb_info *sbi;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return NULL;

	sbi->magic = AUTOFS_SBI_MAGIC;
	sbi->flags = AUTOFS_SBI_CATATONIC;
	sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
	sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
	sbi->pipefd = -1;

	set_autofs_type_indirect(&sbi->type);
	mutex_init(&sbi->wq_mutex);
	mutex_init(&sbi->pipe_mutex);
	spin_lock_init(&sbi->fs_lock);
	spin_lock_init(&sbi->lookup_lock);
	INIT_LIST_HEAD(&sbi->active_list);
	INIT_LIST_HEAD(&sbi->expiring_list);

	return sbi;
}

static int autofs_validate_protocol(struct autofs_sb_info *sbi)
{
	/* 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);
		return -EINVAL;
	}

	/* 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;

	return 0;
}

int autofs_fill_super(struct super_block *s, void *data, int silent)
{
	struct inode *root_inode;
	struct dentry *root;
	struct autofs_sb_info *sbi;
	struct autofs_info *ino;
	int pgrp = 0;
	bool pgrp_set = false;
	int ret = -EINVAL;

	sbi = autofs_alloc_sbi();
	if (!sbi)
		return -ENOMEM;

	pr_debug("starting up, sbi = %p\n", sbi);

	sbi->sb = s;
	s->s_fs_info = sbi;
	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;
	}

	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;
	}

	if (autofs_validate_protocol(sbi))
		goto fail_dput;

	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));

	sbi->flags &= ~AUTOFS_SBI_CATATONIC;

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

	/*
	 * Failure ... clean up.
	 */
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_set_ctime_current(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
7efd93ea IK	113	enum {
	114	Opt_err,
	115	Opt_direct,
	116	Opt_fd,
	117	Opt_gid,
	118	Opt_ignore,
	119	Opt_indirect,
	120	Opt_maxproto,
	121	Opt_minproto,
	122	Opt_offset,
	123	Opt_pgrp,
	124	Opt_strictexpire,
	125	Opt_uid,
	126	};
ebc921ca IK	127
	128	static const match_table_t tokens = {
	129	{Opt_fd, "fd=%u"},
	130	{Opt_uid, "uid=%u"},
	131	{Opt_gid, "gid=%u"},
	132	{Opt_pgrp, "pgrp=%u"},
	133	{Opt_minproto, "minproto=%u"},
	134	{Opt_maxproto, "maxproto=%u"},
	135	{Opt_indirect, "indirect"},
	136	{Opt_direct, "direct"},
	137	{Opt_offset, "offset"},
f5162216	138	{Opt_strictexpire, "strictexpire"},
60d6d04c	139	{Opt_ignore, "ignore"},
ebc921ca IK	140	{Opt_err, NULL}
	141	};
	142
546694b8 IK	143	static int autofs_parse_fd(struct autofs_sb_info *sbi, int fd)
	144	{
	145	struct file *pipe;
	146	int ret;
	147
	148	pipe = fget(fd);
	149	if (!pipe) {
	150	pr_err("could not open pipe file descriptor\n");
	151	return -EBADF;
	152	}
	153
	154	ret = autofs_check_pipe(pipe);
	155	if (ret < 0) {
	156	pr_err("Invalid/unusable pipe\n");
	157	fput(pipe);
	158	return -EBADF;
	159	}
	160
	161	if (sbi->pipe)
	162	fput(sbi->pipe);
	163
	164	sbi->pipefd = fd;
	165	sbi->pipe = pipe;
	166
	167	return 0;
	168	}
	169
9b273166 IK	170	static int autofs_parse_param(char optstr, struct inode root,
	171	int pgrp, bool pgrp_set,
	172	struct autofs_sb_info *sbi)
ebc921ca	173	{
ebc921ca IK	174	substring_t args[MAX_OPT_ARGS];
ebc921ca IK	175	int option;
9bf964c9 IK	176	int pipefd = -1;
	177	kuid_t uid;
	178	kgid_t gid;
9b273166	179	int token;
546694b8	180	int ret;
ebc921ca	181
9b273166 IK	182	token = match_token(optstr, tokens, args);
	183	switch (token) {
	184	case Opt_fd:
	185	if (match_int(args, &pipefd))
	186	return 1;
	187	ret = autofs_parse_fd(sbi, pipefd);
	188	if (ret)
	189	return 1;
	190	break;
	191	case Opt_uid:
	192	if (match_int(args, &option))
	193	return 1;
	194	uid = make_kuid(current_user_ns(), option);
	195	if (!uid_valid(uid))
	196	return 1;
	197	root->i_uid = uid;
	198	break;
	199	case Opt_gid:
	200	if (match_int(args, &option))
	201	return 1;
	202	gid = make_kgid(current_user_ns(), option);
	203	if (!gid_valid(gid))
	204	return 1;
	205	root->i_gid = gid;
	206	break;
	207	case Opt_pgrp:
	208	if (match_int(args, &option))
	209	return 1;
	210	*pgrp = option;
	211	*pgrp_set = true;
	212	break;
	213	case Opt_minproto:
	214	if (match_int(args, &option))
	215	return 1;
	216	sbi->min_proto = option;
	217	break;
	218	case Opt_maxproto:
	219	if (match_int(args, &option))
	220	return 1;
	221	sbi->max_proto = option;
	222	break;
	223	case Opt_indirect:
	224	set_autofs_type_indirect(&sbi->type);
	225	break;
	226	case Opt_direct:
	227	set_autofs_type_direct(&sbi->type);
	228	break;
	229	case Opt_offset:
	230	set_autofs_type_offset(&sbi->type);
	231	break;
	232	case Opt_strictexpire:
	233	sbi->flags \|= AUTOFS_SBI_STRICTEXPIRE;
	234	break;
	235	case Opt_ignore:
	236	sbi->flags \|= AUTOFS_SBI_IGNORE;
	237	}
	238
	239	return 0;
	240	}
	241
	242	static int parse_options(char *options,
	243	struct inode root, int pgrp, bool *pgrp_set,
	244	struct autofs_sb_info *sbi)
	245	{
246	char *p;
247
9bf964c9 IK	248	root->i_uid = current_uid();
9bf964c9 IK	249	root->i_gid = current_gid();
ebc921ca	250
ebc921ca IK	251	if (!options)
	252	return 1;
	253
	254	while ((p = strsep(&options, ",")) != NULL) {
ebc921ca IK	255	if (!*p)
	256	continue;
	257
9b273166	258	if (autofs_parse_param(p, root, pgrp, pgrp_set, sbi))
ebc921ca	259	return 1;
ebc921ca	260	}
9b273166	261
9bf964c9	262	return (sbi->pipefd < 0);
ebc921ca IK	263	}
ebc921ca IK	264
a7467430	265	static struct autofs_sb_info *autofs_alloc_sbi(void)
ebc921ca	266	{
ebc921ca	267	struct autofs_sb_info *sbi;
ebc921ca IK	268
	269	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	270	if (!sbi)
a7467430	271	return NULL;
ebc921ca	272
ebc921ca	273	sbi->magic = AUTOFS_SBI_MAGIC;
9d8719a4	274	sbi->flags = AUTOFS_SBI_CATATONIC;
a7467430 IK	275	sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
	276	sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
	277	sbi->pipefd = -1;
	278
ebc921ca	279	set_autofs_type_indirect(&sbi->type);
ebc921ca IK	280	mutex_init(&sbi->wq_mutex);
	281	mutex_init(&sbi->pipe_mutex);
	282	spin_lock_init(&sbi->fs_lock);
ebc921ca IK	283	spin_lock_init(&sbi->lookup_lock);
	284	INIT_LIST_HEAD(&sbi->active_list);
	285	INIT_LIST_HEAD(&sbi->expiring_list);
a7467430 IK	286
	287	return sbi;
	288	}
	289
1f50012d IK	290	static int autofs_validate_protocol(struct autofs_sb_info *sbi)
	291	{
	292	/* Test versions first */
	293	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
	294	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
	295	pr_err("kernel does not match daemon version "
	296	"daemon (%d, %d) kernel (%d, %d)\n",
	297	sbi->min_proto, sbi->max_proto,
	298	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	299	return -EINVAL;
	300	}
	301
	302	/* Establish highest kernel protocol version */
	303	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	304	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	305	else
	306	sbi->version = sbi->max_proto;
	307	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	308
	309	return 0;
	310	}
	311
a7467430 IK	312	int autofs_fill_super(struct super_block s, void data, int silent)
	313	{
	314	struct inode *root_inode;
	315	struct dentry *root;
	316	struct autofs_sb_info *sbi;
	317	struct autofs_info *ino;
	318	int pgrp = 0;
	319	bool pgrp_set = false;
	320	int ret = -EINVAL;
	321
	322	sbi = autofs_alloc_sbi();
	323	if (!sbi)
	324	return -ENOMEM;
	325
	326	pr_debug("starting up, sbi = %p\n", sbi);
	327
	328	sbi->sb = s;
	329	s->s_fs_info = sbi;
ebc921ca IK	330	s->s_blocksize = 1024;
	331	s->s_blocksize_bits = 10;
	332	s->s_magic = AUTOFS_SUPER_MAGIC;
	333	s->s_op = &autofs_sops;
	334	s->s_d_op = &autofs_dentry_operations;
	335	s->s_time_gran = 1;
	336
	337	/*
	338	* Get the root inode and dentry, but defer checking for errors.
	339	*/
	340	ino = autofs_new_ino(sbi);
	341	if (!ino) {
	342	ret = -ENOMEM;
	343	goto fail_free;
	344	}
	345	root_inode = autofs_get_inode(s, S_IFDIR \| 0755);
	346	root = d_make_root(root_inode);
f585b283 IK	347	if (!root) {
f585b283 IK	348	ret = -ENOMEM;
ebc921ca	349	goto fail_ino;
f585b283	350	}
ebc921ca IK	351
	352	root->d_fsdata = ino;
	353
	354	/* Can this call block? */
9bf964c9	355	if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
ebc921ca IK	356	pr_err("called with bogus options\n");
	357	goto fail_dput;
	358	}
	359
1f50012d	360	if (autofs_validate_protocol(sbi))
ebc921ca	361	goto fail_dput;
ebc921ca IK	362
	363	if (pgrp_set) {
	364	sbi->oz_pgrp = find_get_pid(pgrp);
	365	if (!sbi->oz_pgrp) {
	366	pr_err("could not find process group %d\n",
	367	pgrp);
	368	goto fail_dput;
	369	}
	370	} else {
	371	sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
	372	}
	373
	374	if (autofs_type_trigger(sbi->type))
	375	__managed_dentry_set_managed(root);
	376
	377	root_inode->i_fop = &autofs_root_operations;
	378	root_inode->i_op = &autofs_dir_inode_operations;
	379
9bf964c9 IK	380	pr_debug("pipe fd = %d, pgrp = %u\n",
9bf964c9 IK	381	sbi->pipefd, pid_nr(sbi->oz_pgrp));
ebc921ca	382
9d8719a4	383	sbi->flags &= ~AUTOFS_SBI_CATATONIC;
ebc921ca IK	384
	385	/*
	386	* Success! Install the root dentry now to indicate completion.
	387	*/
	388	s->s_root = root;
	389	return 0;
	390
	391	/*
	392	* Failure ... clean up.
	393	*/
ebc921ca IK	394	fail_dput:
	395	dput(root);
	396	goto fail_free;
	397	fail_ino:
	398	autofs_free_ino(ino);
	399	fail_free:
	400	kfree(sbi);
	401	s->s_fs_info = NULL;
	402	return ret;
	403	}
	404
	405	struct inode autofs_get_inode(struct super_block sb, umode_t mode)
	406	{
	407	struct inode *inode = new_inode(sb);
	408
	409	if (inode == NULL)
	410	return NULL;
	411
	412	inode->i_mode = mode;
	413	if (sb->s_root) {
	414	inode->i_uid = d_inode(sb->s_root)->i_uid;
	415	inode->i_gid = d_inode(sb->s_root)->i_gid;
	416	}
36aa5eae	417	inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
ebc921ca IK	418	inode->i_ino = get_next_ino();
	419
	420	if (S_ISDIR(mode)) {
	421	set_nlink(inode, 2);
	422	inode->i_op = &autofs_dir_inode_operations;
	423	inode->i_fop = &autofs_dir_operations;
	424	} else if (S_ISLNK(mode)) {
	425	inode->i_op = &autofs_symlink_inode_operations;
	426	} else
	427	WARN_ON(1);
	428
	429	return inode;
	430	}