[mirror_ubuntu-bionic-kernel.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>

static void ino_lnkfree(struct autofs_info *ino)
{
	if (ino->u.symlink) {
		kfree(ino->u.symlink);
		ino->u.symlink = NULL;
	}
}

struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
				     struct autofs_sb_info *sbi, mode_t mode)
{
	int reinit = 1;

	if (ino == NULL) {
		reinit = 0;
		ino = kmalloc(sizeof(*ino), GFP_KERNEL);
	}

	if (ino == NULL)
		return NULL;

	if (!reinit) {
		ino->flags = 0;
		ino->inode = NULL;
		ino->dentry = NULL;
		ino->size = 0;
		INIT_LIST_HEAD(&ino->active);
		INIT_LIST_HEAD(&ino->expiring);
		atomic_set(&ino->count, 0);
	}

	ino->uid = 0;
	ino->gid = 0;
	ino->mode = mode;
	ino->last_used = jiffies;

	ino->sbi = sbi;

	if (reinit && ino->free)
		(ino->free)(ino);

	memset(&ino->u, 0, sizeof(ino->u));

	ino->free = NULL;

	if (S_ISLNK(mode))
		ino->free = ino_lnkfree;

	return ino;
}

void autofs4_free_ino(struct autofs_info *ino)
{
	struct autofs_info *p_ino;

	if (ino->dentry) {
		ino->dentry->d_fsdata = NULL;
		if (ino->dentry->d_inode) {
			struct dentry *parent = ino->dentry->d_parent;
			if (atomic_dec_and_test(&ino->count)) {
				p_ino = autofs4_dentry_ino(parent);
				if (p_ino && parent != ino->dentry)
					atomic_dec(&p_ino->count);
			}
			dput(ino->dentry);
		}
		ino->dentry = NULL;
	}
	if (ino->free)
		(ino->free)(ino);
	kfree(ino);
}

/*
 * Deal with the infamous "Busy inodes after umount ..." message.
 *
 * Clean up the dentry tree. This happens with autofs if the user
 * space program goes away due to a SIGKILL, SIGSEGV etc.
 */
static void autofs4_force_release(struct autofs_sb_info *sbi)
{
	struct dentry *this_parent = sbi->sb->s_root;
	struct list_head *next;

	if (!sbi->sb->s_root)
		return;

	spin_lock(&dcache_lock);
repeat:
	next = this_parent->d_subdirs.next;
resume:
	while (next != &this_parent->d_subdirs) {
		struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);

		/* Negative dentry - don`t care */
		if (!simple_positive(dentry)) {
			next = next->next;
			continue;
		}

		if (!list_empty(&dentry->d_subdirs)) {
			this_parent = dentry;
			goto repeat;
		}

		next = next->next;
		spin_unlock(&dcache_lock);

		DPRINTK("dentry %p %.*s",
			dentry, (int)dentry->d_name.len, dentry->d_name.name);

		dput(dentry);
		spin_lock(&dcache_lock);
	}

	if (this_parent != sbi->sb->s_root) {
		struct dentry *dentry = this_parent;

		next = this_parent->d_u.d_child.next;
		this_parent = this_parent->d_parent;
		spin_unlock(&dcache_lock);
		DPRINTK("parent dentry %p %.*s",
			dentry, (int)dentry->d_name.len, dentry->d_name.name);
		dput(dentry);
		spin_lock(&dcache_lock);
		goto resume;
	}
	spin_unlock(&dcache_lock);
}

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)
		goto out_kill_sb;

	/* Free wait queues, close pipe */
	autofs4_catatonic_mode(sbi);

	/* Clean up and release dangling references */
	autofs4_force_release(sbi);

	sb->s_fs_info = NULL;
	kfree(sbi);

out_kill_sb:
	DPRINTK("shutting down");
	kill_anon_super(sb);
}

static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
{
	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
	struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;

	if (!sbi)
		return 0;

	seq_printf(m, ",fd=%d", sbi->pipefd);
	if (root_inode->i_uid != 0)
		seq_printf(m, ",uid=%u", root_inode->i_uid);
	if (root_inode->i_gid != 0)
		seq_printf(m, ",gid=%u", root_inode->i_gid);
	seq_printf(m, ",pgrp=%d", 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 const struct super_operations autofs4_sops = {
	.statfs		= simple_statfs,
	.show_options	= autofs4_show_options,
};

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, uid_t *uid, gid_t *gid,
		pid_t *pgrp, unsigned int *type, int *minproto, int *maxproto)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;

	*uid = current_uid();
	*gid = current_gid();
	*pgrp = task_pgrp_nr(current);

	*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 = option;
			break;
		case Opt_gid:
			if (match_int(args, &option))
				return 1;
			*gid = option;
			break;
		case Opt_pgrp:
			if (match_int(args, &option))
				return 1;
			*pgrp = option;
			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);
}

static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
{
	struct autofs_info *ino;

	ino = autofs4_init_ino(NULL, sbi, S_IFDIR | 0755);
	if (!ino)
		return NULL;

	return ino;
}

static const struct dentry_operations autofs4_sb_dentry_operations = {
	.d_release      = autofs4_dentry_release,
};

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;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		goto fail_unlock;
	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 = task_pgrp_nr(current);
	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);
	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_time_gran = 1;

	/*
	 * Get the root inode and dentry, but defer checking for errors.
	 */
	ino = autofs4_mkroot(sbi);
	if (!ino)
		goto fail_free;
	root_inode = autofs4_get_inode(s, ino);
	if (!root_inode)
		goto fail_ino;

	root = d_alloc_root(root_inode);
	if (!root)
		goto fail_iput;
	pipe = NULL;

	root->d_op = &autofs4_sb_dentry_operations;
	root->d_fsdata = ino;

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

	root_inode->i_fop = &autofs4_root_operations;
	root_inode->i_op = autofs_type_trigger(sbi->type) ?
			&autofs4_direct_root_inode_operations :
			&autofs4_indirect_root_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, sbi->oz_pgrp);
	pipe = fget(pipefd);
	
	if (!pipe) {
		printk("autofs: could not open pipe file descriptor\n");
		goto fail_dput;
	}
	if (!pipe->f_op || !pipe->f_op->write)
		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_iput:
	printk("autofs: get root dentry failed\n");
	iput(root_inode);
fail_ino:
	kfree(ino);
fail_free:
	kfree(sbi);
	s->s_fs_info = NULL;
fail_unlock:
	return -EINVAL;
}

struct inode *autofs4_get_inode(struct super_block *sb,
				struct autofs_info *inf)
{
	struct inode *inode = new_inode(sb);

	if (inode == NULL)
		return NULL;

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

	if (S_ISDIR(inf->mode)) {
		inode->i_nlink = 2;
		inode->i_op = &autofs4_dir_inode_operations;
		inode->i_fop = &autofs4_dir_operations;
	} else if (S_ISLNK(inf->mode)) {
		inode->i_size = inf->size;
		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
	25	static void ino_lnkfree(struct autofs_info *ino)
	26	{
25767378 IK	27	if (ino->u.symlink) {
	28	kfree(ino->u.symlink);
	29	ino->u.symlink = NULL;
	30	}
1da177e4 LT	31	}
	32
	33	struct autofs_info autofs4_init_ino(struct autofs_info ino,
	34	struct autofs_sb_info *sbi, mode_t mode)
	35	{
	36	int reinit = 1;
	37
	38	if (ino == NULL) {
	39	reinit = 0;
	40	ino = kmalloc(sizeof(*ino), GFP_KERNEL);
	41	}
	42
	43	if (ino == NULL)
	44	return NULL;
	45
25767378 IK	46	if (!reinit) {
	47	ino->flags = 0;
	48	ino->inode = NULL;
	49	ino->dentry = NULL;
	50	ino->size = 0;
	51	INIT_LIST_HEAD(&ino->active);
	52	INIT_LIST_HEAD(&ino->expiring);
	53	atomic_set(&ino->count, 0);
	54	}
f50b6f86	55
c0f54d3e IK	56	ino->uid = 0;
c0f54d3e IK	57	ino->gid = 0;
25767378	58	ino->mode = mode;
1da177e4 LT	59	ino->last_used = jiffies;
	60
	61	ino->sbi = sbi;
	62
	63	if (reinit && ino->free)
	64	(ino->free)(ino);
	65
	66	memset(&ino->u, 0, sizeof(ino->u));
	67
	68	ino->free = NULL;
	69
	70	if (S_ISLNK(mode))
	71	ino->free = ino_lnkfree;
	72
	73	return ino;
	74	}
	75
	76	void autofs4_free_ino(struct autofs_info *ino)
	77	{
1aff3c8b IK	78	struct autofs_info *p_ino;
1aff3c8b IK	79
1da177e4 LT	80	if (ino->dentry) {
1da177e4 LT	81	ino->dentry->d_fsdata = NULL;
1aff3c8b IK	82	if (ino->dentry->d_inode) {
	83	struct dentry *parent = ino->dentry->d_parent;
	84	if (atomic_dec_and_test(&ino->count)) {
	85	p_ino = autofs4_dentry_ino(parent);
	86	if (p_ino && parent != ino->dentry)
	87	atomic_dec(&p_ino->count);
	88	}
1da177e4	89	dput(ino->dentry);
1aff3c8b	90	}
1da177e4 LT	91	ino->dentry = NULL;
	92	}
	93	if (ino->free)
	94	(ino->free)(ino);
	95	kfree(ino);
	96	}
	97
104e49fc IK	98	/*
	99	* Deal with the infamous "Busy inodes after umount ..." message.
	100	*
	101	* Clean up the dentry tree. This happens with autofs if the user
	102	* space program goes away due to a SIGKILL, SIGSEGV etc.
	103	*/
	104	static void autofs4_force_release(struct autofs_sb_info *sbi)
	105	{
6ce31523	106	struct dentry *this_parent = sbi->sb->s_root;
104e49fc IK	107	struct list_head *next;
104e49fc IK	108
ba8df43c IK	109	if (!sbi->sb->s_root)
	110	return;
	111
104e49fc IK	112	spin_lock(&dcache_lock);
	113	repeat:
	114	next = this_parent->d_subdirs.next;
	115	resume:
	116	while (next != &this_parent->d_subdirs) {
5160ee6f	117	struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
104e49fc IK	118
	119	/* Negative dentry - don`t care */
	120	if (!simple_positive(dentry)) {
	121	next = next->next;
	122	continue;
	123	}
	124
	125	if (!list_empty(&dentry->d_subdirs)) {
	126	this_parent = dentry;
	127	goto repeat;
	128	}
	129
	130	next = next->next;
	131	spin_unlock(&dcache_lock);
	132
	133	DPRINTK("dentry %p %.*s",
	134	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	135
	136	dput(dentry);
	137	spin_lock(&dcache_lock);
	138	}
	139
6ce31523	140	if (this_parent != sbi->sb->s_root) {
104e49fc IK	141	struct dentry *dentry = this_parent;
104e49fc IK	142
5160ee6f	143	next = this_parent->d_u.d_child.next;
104e49fc IK	144	this_parent = this_parent->d_parent;
	145	spin_unlock(&dcache_lock);
	146	DPRINTK("parent dentry %p %.*s",
	147	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	148	dput(dentry);
	149	spin_lock(&dcache_lock);
	150	goto resume;
	151	}
	152	spin_unlock(&dcache_lock);
104e49fc IK	153	}
104e49fc IK	154
6ce31523	155	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	156	{
	157	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	158
ba8df43c IK	159	/*
	160	* In the event of a failure in get_sb_nodev the superblock
	161	* info is not present so nothing else has been setup, so
c949d4eb JK	162	* just call kill_anon_super when we are called from
c949d4eb JK	163	* deactivate_super.
ba8df43c IK	164	*/
ba8df43c IK	165	if (!sbi)
c949d4eb	166	goto out_kill_sb;
ba8df43c	167
5a11d4d0 IK	168	/* Free wait queues, close pipe */
5a11d4d0 IK	169	autofs4_catatonic_mode(sbi);
1da177e4	170
104e49fc	171	/* Clean up and release dangling references */
3370c74b	172	autofs4_force_release(sbi);
104e49fc	173
f50b6f86	174	sb->s_fs_info = NULL;
1da177e4 LT	175	kfree(sbi);
1da177e4 LT	176
c949d4eb	177	out_kill_sb:
1da177e4	178	DPRINTK("shutting down");
6ce31523	179	kill_anon_super(sb);
1da177e4 LT	180	}
1da177e4 LT	181
d7c4a5f1 IK	182	static int autofs4_show_options(struct seq_file m, struct vfsmount mnt)
	183	{
	184	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
aef97cb9	185	struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;
d7c4a5f1 IK	186
	187	if (!sbi)
	188	return 0;
	189
	190	seq_printf(m, ",fd=%d", sbi->pipefd);
aef97cb9 MS	191	if (root_inode->i_uid != 0)
	192	seq_printf(m, ",uid=%u", root_inode->i_uid);
	193	if (root_inode->i_gid != 0)
	194	seq_printf(m, ",gid=%u", root_inode->i_gid);
d7c4a5f1 IK	195	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	196	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	197	seq_printf(m, ",minproto=%d", sbi->min_proto);
	198	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	199
a92daf6b	200	if (autofs_type_offset(sbi->type))
34ca959c	201	seq_printf(m, ",offset");
a92daf6b	202	else if (autofs_type_direct(sbi->type))
34ca959c IK	203	seq_printf(m, ",direct");
	204	else
	205	seq_printf(m, ",indirect");
	206
d7c4a5f1 IK	207	return 0;
	208	}
	209
ee9b6d61	210	static const struct super_operations autofs4_sops = {
1da177e4	211	.statfs = simple_statfs,
d7c4a5f1	212	.show_options = autofs4_show_options,
1da177e4 LT	213	};
1da177e4 LT	214
34ca959c IK	215	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	216	Opt_indirect, Opt_direct, Opt_offset};
1da177e4	217
a447c093	218	static const match_table_t tokens = {
1da177e4 LT	219	{Opt_fd, "fd=%u"},
	220	{Opt_uid, "uid=%u"},
	221	{Opt_gid, "gid=%u"},
	222	{Opt_pgrp, "pgrp=%u"},
	223	{Opt_minproto, "minproto=%u"},
	224	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	225	{Opt_indirect, "indirect"},
	226	{Opt_direct, "direct"},
	227	{Opt_offset, "offset"},
1da177e4 LT	228	{Opt_err, NULL}
	229	};
	230
	231	static int parse_options(char options, int pipefd, uid_t uid, gid_t gid,
d78e53c8	232	pid_t pgrp, unsigned int type, int minproto, int maxproto)
1da177e4 LT	233	{
	234	char *p;
	235	substring_t args[MAX_OPT_ARGS];
	236	int option;
	237
0eb790e3 DH	238	*uid = current_uid();
0eb790e3 DH	239	*gid = current_gid();
a47afb0f	240	*pgrp = task_pgrp_nr(current);
1da177e4 LT	241
	242	*minproto = AUTOFS_MIN_PROTO_VERSION;
	243	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	244
	245	*pipefd = -1;
	246
	247	if (!options)
	248	return 1;
	249
	250	while ((p = strsep(&options, ",")) != NULL) {
	251	int token;
	252	if (!*p)
	253	continue;
	254
	255	token = match_token(p, tokens, args);
	256	switch (token) {
	257	case Opt_fd:
	258	if (match_int(args, pipefd))
	259	return 1;
	260	break;
	261	case Opt_uid:
	262	if (match_int(args, &option))
	263	return 1;
	264	*uid = option;
	265	break;
	266	case Opt_gid:
	267	if (match_int(args, &option))
	268	return 1;
	269	*gid = option;
	270	break;
	271	case Opt_pgrp:
	272	if (match_int(args, &option))
	273	return 1;
	274	*pgrp = option;
	275	break;
	276	case Opt_minproto:
	277	if (match_int(args, &option))
	278	return 1;
	279	*minproto = option;
	280	break;
	281	case Opt_maxproto:
	282	if (match_int(args, &option))
	283	return 1;
	284	*maxproto = option;
	285	break;
34ca959c	286	case Opt_indirect:
a92daf6b	287	set_autofs_type_indirect(type);
34ca959c IK	288	break;
34ca959c IK	289	case Opt_direct:
a92daf6b	290	set_autofs_type_direct(type);
34ca959c IK	291	break;
34ca959c IK	292	case Opt_offset:
a92daf6b	293	set_autofs_type_offset(type);
34ca959c	294	break;
1da177e4 LT	295	default:
	296	return 1;
	297	}
	298	}
	299	return (*pipefd < 0);
	300	}
	301
	302	static struct autofs_info autofs4_mkroot(struct autofs_sb_info sbi)
	303	{
	304	struct autofs_info *ino;
	305
	306	ino = autofs4_init_ino(NULL, sbi, S_IFDIR \| 0755);
	307	if (!ino)
	308	return NULL;
	309
	310	return ino;
	311	}
	312
08f11513	313	static const struct dentry_operations autofs4_sb_dentry_operations = {
34ca959c IK	314	.d_release = autofs4_dentry_release,
	315	};
	316
1da177e4 LT	317	int autofs4_fill_super(struct super_block s, void data, int silent)
	318	{
	319	struct inode * root_inode;
	320	struct dentry * root;
	321	struct file * pipe;
	322	int pipefd;
	323	struct autofs_sb_info *sbi;
	324	struct autofs_info *ino;
1da177e4	325
b63d50c4	326	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	327	if (!sbi)
1da177e4 LT	328	goto fail_unlock;
	329	DPRINTK("starting up, sbi = %p",sbi);
	330
1da177e4 LT	331	s->s_fs_info = sbi;
1da177e4 LT	332	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	333	sbi->pipefd = -1;
ba8df43c IK	334	sbi->pipe = NULL;
ba8df43c IK	335	sbi->catatonic = 1;
1da177e4	336	sbi->exp_timeout = 0;
a47afb0f	337	sbi->oz_pgrp = task_pgrp_nr(current);
1da177e4 LT	338	sbi->sb = s;
	339	sbi->version = 0;
	340	sbi->sub_version = 0;
a92daf6b	341	set_autofs_type_indirect(&sbi->type);
d7c4a5f1 IK	342	sbi->min_proto = 0;
d7c4a5f1 IK	343	sbi->max_proto = 0;
1d5599e3	344	mutex_init(&sbi->wq_mutex);
3a9720ce	345	spin_lock_init(&sbi->fs_lock);
1da177e4	346	sbi->queues = NULL;
5f6f4f28	347	spin_lock_init(&sbi->lookup_lock);
25767378	348	INIT_LIST_HEAD(&sbi->active_list);
5f6f4f28	349	INIT_LIST_HEAD(&sbi->expiring_list);
1da177e4 LT	350	s->s_blocksize = 1024;
	351	s->s_blocksize_bits = 10;
	352	s->s_magic = AUTOFS_SUPER_MAGIC;
	353	s->s_op = &autofs4_sops;
	354	s->s_time_gran = 1;
	355
	356	/*
	357	* Get the root inode and dentry, but defer checking for errors.
	358	*/
	359	ino = autofs4_mkroot(sbi);
	360	if (!ino)
	361	goto fail_free;
	362	root_inode = autofs4_get_inode(s, ino);
1da177e4	363	if (!root_inode)
34ca959c	364	goto fail_ino;
1da177e4	365
1da177e4	366	root = d_alloc_root(root_inode);
1da177e4 LT	367	if (!root)
1da177e4 LT	368	goto fail_iput;
34ca959c IK	369	pipe = NULL;
	370
	371	root->d_op = &autofs4_sb_dentry_operations;
	372	root->d_fsdata = ino;
1da177e4 LT	373
1da177e4 LT	374	/* Can this call block? */
d78e53c8 SB	375	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
	376	&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
	377	&sbi->max_proto)) {
1da177e4 LT	378	printk("autofs: called with bogus options\n");
	379	goto fail_dput;
	380	}
	381
34ca959c	382	root_inode->i_fop = &autofs4_root_operations;
a92daf6b	383	root_inode->i_op = autofs_type_trigger(sbi->type) ?
34ca959c IK	384	&autofs4_direct_root_inode_operations :
	385	&autofs4_indirect_root_inode_operations;
	386
1da177e4	387	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	388	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	389	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	390	printk("autofs: kernel does not match daemon version "
1da177e4 LT	391	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	392	sbi->min_proto, sbi->max_proto,
1da177e4 LT	393	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	394	goto fail_dput;
	395	}
	396
d7c4a5f1 IK	397	/* Establish highest kernel protocol version */
	398	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	399	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	400	else
	401	sbi->version = sbi->max_proto;
1da177e4 LT	402	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	403
	404	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	405	pipe = fget(pipefd);
	406
d78e53c8	407	if (!pipe) {
1da177e4 LT	408	printk("autofs: could not open pipe file descriptor\n");
	409	goto fail_dput;
	410	}
d78e53c8	411	if (!pipe->f_op \|\| !pipe->f_op->write)
1da177e4 LT	412	goto fail_fput;
1da177e4 LT	413	sbi->pipe = pipe;
d7c4a5f1	414	sbi->pipefd = pipefd;
ba8df43c	415	sbi->catatonic = 0;
1da177e4 LT	416
	417	/*
	418	* Success! Install the root dentry now to indicate completion.
	419	*/
	420	s->s_root = root;
	421	return 0;
	422
	423	/*
	424	* Failure ... clean up.
	425	*/
	426	fail_fput:
	427	printk("autofs: pipe file descriptor does not contain proper ops\n");
	428	fput(pipe);
	429	/* fall through */
	430	fail_dput:
	431	dput(root);
	432	goto fail_free;
	433	fail_iput:
	434	printk("autofs: get root dentry failed\n");
	435	iput(root_inode);
34ca959c IK	436	fail_ino:
34ca959c IK	437	kfree(ino);
1da177e4 LT	438	fail_free:
1da177e4 LT	439	kfree(sbi);
ba8df43c	440	s->s_fs_info = NULL;
1da177e4 LT	441	fail_unlock:
	442	return -EINVAL;
	443	}
	444
	445	struct inode autofs4_get_inode(struct super_block sb,
	446	struct autofs_info *inf)
	447	{
	448	struct inode *inode = new_inode(sb);
	449
	450	if (inode == NULL)
	451	return NULL;
	452
	453	inf->inode = inode;
	454	inode->i_mode = inf->mode;
	455	if (sb->s_root) {
	456	inode->i_uid = sb->s_root->d_inode->i_uid;
	457	inode->i_gid = sb->s_root->d_inode->i_gid;
1da177e4	458	}
1da177e4 LT	459	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	460
	461	if (S_ISDIR(inf->mode)) {
	462	inode->i_nlink = 2;
	463	inode->i_op = &autofs4_dir_inode_operations;
	464	inode->i_fop = &autofs4_dir_operations;
	465	} else if (S_ISLNK(inf->mode)) {
	466	inode->i_size = inf->size;
	467	inode->i_op = &autofs4_symlink_inode_operations;
	468	}
	469
	470	return inode;
	471	}