[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/smp_lock.h>
#include "autofs_i.h"
#include <linux/module.h>

static void ino_lnkfree(struct autofs_info *ino)
{
	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;

	ino->flags = 0;
	ino->mode = mode;
	ino->inode = NULL;
	ino->dentry = NULL;
	ino->size = 0;

	ino->last_used = jiffies;
	atomic_set(&ino->count, 0);

	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->root;
	struct list_head *next;

	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->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);

	dput(sbi->root);
	sbi->root = NULL;
	shrink_dcache_sb(sbi->sb);

	return;
}

static void autofs4_put_super(struct super_block *sb)
{
	struct autofs_sb_info *sbi = autofs4_sbi(sb);

	sb->s_fs_info = NULL;

	if ( !sbi->catatonic )
		autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */

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

	kfree(sbi);

	DPRINTK("shutting down");
}

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

	if (!sbi)
		return 0;

	seq_printf(m, ",fd=%d", sbi->pipefd);
	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 (sbi->type & AUTOFS_TYP_OFFSET)
		seq_printf(m, ",offset");
	else if (sbi->type & AUTOFS_TYP_DIRECT)
		seq_printf(m, ",direct");
	else
		seq_printf(m, ",indirect");

	return 0;
}

static struct super_operations autofs4_sops = {
	.put_super	= autofs4_put_super,
	.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 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 = process_group(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:
			*type = AUTOFS_TYP_INDIRECT;
			break;
		case Opt_direct:
			*type = AUTOFS_TYP_DIRECT;
			break;
		case Opt_offset:
			*type = AUTOFS_TYP_DIRECT | AUTOFS_TYP_OFFSET;
			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;
}

void autofs4_dentry_release(struct dentry *);
static 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 = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
	if ( !sbi )
		goto fail_unlock;
	DPRINTK("starting up, sbi = %p",sbi);

	memset(sbi, 0, sizeof(*sbi));

	s->s_fs_info = sbi;
	sbi->magic = AUTOFS_SBI_MAGIC;
	sbi->root = NULL;
	sbi->pipefd = -1;
	sbi->catatonic = 0;
	sbi->exp_timeout = 0;
	sbi->oz_pgrp = process_group(current);
	sbi->sb = s;
	sbi->version = 0;
	sbi->sub_version = 0;
	sbi->type = 0;
	sbi->min_proto = 0;
	sbi->max_proto = 0;
	mutex_init(&sbi->wq_mutex);
	spin_lock_init(&sbi->fs_lock);
	sbi->queues = NULL;
	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 = sbi->type & AUTOFS_TYP_DIRECT ?
			&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;

	/*
	 * Take a reference to the root dentry so we get a chance to
	 * clean up the dentry tree on umount.
	 * See autofs4_force_release.
	 */
	sbi->root = dget(root);

	/*
	 * 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);
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;
	} else {
		inode->i_uid = 0;
		inode->i_gid = 0;
	}
	inode->i_blksize = PAGE_CACHE_SIZE;
	inode->i_blocks = 0;
	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>
104e49fc	21	#include <linux/smp_lock.h>
1da177e4 LT	22	#include "autofs_i.h"
	23	#include <linux/module.h>
	24
	25	static void ino_lnkfree(struct autofs_info *ino)
	26	{
f99d49ad JJ	27	kfree(ino->u.symlink);
f99d49ad JJ	28	ino->u.symlink = NULL;
1da177e4 LT	29	}
	30
	31	struct autofs_info autofs4_init_ino(struct autofs_info ino,
	32	struct autofs_sb_info *sbi, mode_t mode)
	33	{
	34	int reinit = 1;
	35
	36	if (ino == NULL) {
	37	reinit = 0;
	38	ino = kmalloc(sizeof(*ino), GFP_KERNEL);
	39	}
	40
	41	if (ino == NULL)
	42	return NULL;
	43
	44	ino->flags = 0;
	45	ino->mode = mode;
	46	ino->inode = NULL;
	47	ino->dentry = NULL;
	48	ino->size = 0;
	49
	50	ino->last_used = jiffies;
1aff3c8b	51	atomic_set(&ino->count, 0);
1da177e4 LT	52
	53	ino->sbi = sbi;
	54
	55	if (reinit && ino->free)
	56	(ino->free)(ino);
	57
	58	memset(&ino->u, 0, sizeof(ino->u));
	59
	60	ino->free = NULL;
	61
	62	if (S_ISLNK(mode))
	63	ino->free = ino_lnkfree;
	64
	65	return ino;
	66	}
	67
	68	void autofs4_free_ino(struct autofs_info *ino)
	69	{
1aff3c8b IK	70	struct autofs_info *p_ino;
1aff3c8b IK	71
1da177e4 LT	72	if (ino->dentry) {
1da177e4 LT	73	ino->dentry->d_fsdata = NULL;
1aff3c8b IK	74	if (ino->dentry->d_inode) {
	75	struct dentry *parent = ino->dentry->d_parent;
	76	if (atomic_dec_and_test(&ino->count)) {
	77	p_ino = autofs4_dentry_ino(parent);
	78	if (p_ino && parent != ino->dentry)
	79	atomic_dec(&p_ino->count);
	80	}
1da177e4	81	dput(ino->dentry);
1aff3c8b	82	}
1da177e4 LT	83	ino->dentry = NULL;
	84	}
	85	if (ino->free)
	86	(ino->free)(ino);
	87	kfree(ino);
	88	}
	89
104e49fc IK	90	/*
	91	* Deal with the infamous "Busy inodes after umount ..." message.
	92	*
	93	* Clean up the dentry tree. This happens with autofs if the user
	94	* space program goes away due to a SIGKILL, SIGSEGV etc.
	95	*/
	96	static void autofs4_force_release(struct autofs_sb_info *sbi)
	97	{
	98	struct dentry *this_parent = sbi->root;
	99	struct list_head *next;
	100
	101	spin_lock(&dcache_lock);
	102	repeat:
	103	next = this_parent->d_subdirs.next;
	104	resume:
	105	while (next != &this_parent->d_subdirs) {
5160ee6f	106	struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
104e49fc IK	107
	108	/* Negative dentry - don`t care */
	109	if (!simple_positive(dentry)) {
	110	next = next->next;
	111	continue;
	112	}
	113
	114	if (!list_empty(&dentry->d_subdirs)) {
	115	this_parent = dentry;
	116	goto repeat;
	117	}
	118
	119	next = next->next;
	120	spin_unlock(&dcache_lock);
	121
	122	DPRINTK("dentry %p %.*s",
	123	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	124
	125	dput(dentry);
	126	spin_lock(&dcache_lock);
	127	}
	128
	129	if (this_parent != sbi->root) {
	130	struct dentry *dentry = this_parent;
	131
5160ee6f	132	next = this_parent->d_u.d_child.next;
104e49fc IK	133	this_parent = this_parent->d_parent;
	134	spin_unlock(&dcache_lock);
	135	DPRINTK("parent dentry %p %.*s",
	136	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	137	dput(dentry);
	138	spin_lock(&dcache_lock);
	139	goto resume;
	140	}
	141	spin_unlock(&dcache_lock);
	142
	143	dput(sbi->root);
	144	sbi->root = NULL;
	145	shrink_dcache_sb(sbi->sb);
	146
	147	return;
	148	}
	149
1da177e4 LT	150	static void autofs4_put_super(struct super_block *sb)
	151	{
	152	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	153
	154	sb->s_fs_info = NULL;
	155
	156	if ( !sbi->catatonic )
	157	autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
	158
104e49fc IK	159	/* Clean up and release dangling references */
	160	if (sbi)
	161	autofs4_force_release(sbi);
	162
1da177e4 LT	163	kfree(sbi);
	164
	165	DPRINTK("shutting down");
	166	}
	167
d7c4a5f1 IK	168	static int autofs4_show_options(struct seq_file m, struct vfsmount mnt)
	169	{
	170	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
	171
	172	if (!sbi)
	173	return 0;
	174
	175	seq_printf(m, ",fd=%d", sbi->pipefd);
	176	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	177	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	178	seq_printf(m, ",minproto=%d", sbi->min_proto);
	179	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	180
34ca959c IK	181	if (sbi->type & AUTOFS_TYP_OFFSET)
	182	seq_printf(m, ",offset");
	183	else if (sbi->type & AUTOFS_TYP_DIRECT)
	184	seq_printf(m, ",direct");
	185	else
	186	seq_printf(m, ",indirect");
	187
d7c4a5f1 IK	188	return 0;
	189	}
	190
1da177e4 LT	191	static struct super_operations autofs4_sops = {
	192	.put_super = autofs4_put_super,
	193	.statfs = simple_statfs,
d7c4a5f1	194	.show_options = autofs4_show_options,
1da177e4 LT	195	};
1da177e4 LT	196
34ca959c IK	197	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	198	Opt_indirect, Opt_direct, Opt_offset};
1da177e4 LT	199
	200	static match_table_t tokens = {
	201	{Opt_fd, "fd=%u"},
	202	{Opt_uid, "uid=%u"},
	203	{Opt_gid, "gid=%u"},
	204	{Opt_pgrp, "pgrp=%u"},
	205	{Opt_minproto, "minproto=%u"},
	206	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	207	{Opt_indirect, "indirect"},
	208	{Opt_direct, "direct"},
	209	{Opt_offset, "offset"},
1da177e4 LT	210	{Opt_err, NULL}
	211	};
	212
	213	static int parse_options(char options, int pipefd, uid_t uid, gid_t gid,
34ca959c IK	214	pid_t pgrp, unsigned int type,
34ca959c IK	215	int minproto, int maxproto)
1da177e4 LT	216	{
	217	char *p;
	218	substring_t args[MAX_OPT_ARGS];
	219	int option;
	220
	221	*uid = current->uid;
	222	*gid = current->gid;
	223	*pgrp = process_group(current);
	224
	225	*minproto = AUTOFS_MIN_PROTO_VERSION;
	226	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	227
	228	*pipefd = -1;
	229
	230	if (!options)
	231	return 1;
	232
	233	while ((p = strsep(&options, ",")) != NULL) {
	234	int token;
	235	if (!*p)
	236	continue;
	237
	238	token = match_token(p, tokens, args);
	239	switch (token) {
	240	case Opt_fd:
	241	if (match_int(args, pipefd))
	242	return 1;
	243	break;
	244	case Opt_uid:
	245	if (match_int(args, &option))
	246	return 1;
	247	*uid = option;
	248	break;
	249	case Opt_gid:
	250	if (match_int(args, &option))
	251	return 1;
	252	*gid = option;
	253	break;
	254	case Opt_pgrp:
	255	if (match_int(args, &option))
	256	return 1;
	257	*pgrp = option;
	258	break;
	259	case Opt_minproto:
	260	if (match_int(args, &option))
	261	return 1;
	262	*minproto = option;
	263	break;
	264	case Opt_maxproto:
	265	if (match_int(args, &option))
	266	return 1;
	267	*maxproto = option;
	268	break;
34ca959c IK	269	case Opt_indirect:
	270	*type = AUTOFS_TYP_INDIRECT;
	271	break;
	272	case Opt_direct:
	273	*type = AUTOFS_TYP_DIRECT;
	274	break;
	275	case Opt_offset:
	276	*type = AUTOFS_TYP_DIRECT \| AUTOFS_TYP_OFFSET;
	277	break;
1da177e4 LT	278	default:
	279	return 1;
	280	}
	281	}
	282	return (*pipefd < 0);
	283	}
	284
	285	static struct autofs_info autofs4_mkroot(struct autofs_sb_info sbi)
	286	{
	287	struct autofs_info *ino;
	288
	289	ino = autofs4_init_ino(NULL, sbi, S_IFDIR \| 0755);
	290	if (!ino)
	291	return NULL;
	292
	293	return ino;
	294	}
	295
34ca959c IK	296	void autofs4_dentry_release(struct dentry *);
	297	static struct dentry_operations autofs4_sb_dentry_operations = {
	298	.d_release = autofs4_dentry_release,
	299	};
	300
1da177e4 LT	301	int autofs4_fill_super(struct super_block s, void data, int silent)
	302	{
	303	struct inode * root_inode;
	304	struct dentry * root;
	305	struct file * pipe;
	306	int pipefd;
	307	struct autofs_sb_info *sbi;
	308	struct autofs_info *ino;
1da177e4 LT	309
	310	sbi = (struct autofs_sb_info ) kmalloc(sizeof(sbi), GFP_KERNEL);
	311	if ( !sbi )
	312	goto fail_unlock;
	313	DPRINTK("starting up, sbi = %p",sbi);
	314
	315	memset(sbi, 0, sizeof(*sbi));
	316
	317	s->s_fs_info = sbi;
	318	sbi->magic = AUTOFS_SBI_MAGIC;
104e49fc	319	sbi->root = NULL;
d7c4a5f1	320	sbi->pipefd = -1;
1da177e4 LT	321	sbi->catatonic = 0;
	322	sbi->exp_timeout = 0;
	323	sbi->oz_pgrp = process_group(current);
	324	sbi->sb = s;
	325	sbi->version = 0;
	326	sbi->sub_version = 0;
34ca959c	327	sbi->type = 0;
d7c4a5f1 IK	328	sbi->min_proto = 0;
d7c4a5f1 IK	329	sbi->max_proto = 0;
1d5599e3	330	mutex_init(&sbi->wq_mutex);
3a9720ce	331	spin_lock_init(&sbi->fs_lock);
1da177e4 LT	332	sbi->queues = NULL;
	333	s->s_blocksize = 1024;
	334	s->s_blocksize_bits = 10;
	335	s->s_magic = AUTOFS_SUPER_MAGIC;
	336	s->s_op = &autofs4_sops;
	337	s->s_time_gran = 1;
	338
	339	/*
	340	* Get the root inode and dentry, but defer checking for errors.
	341	*/
	342	ino = autofs4_mkroot(sbi);
	343	if (!ino)
	344	goto fail_free;
	345	root_inode = autofs4_get_inode(s, ino);
1da177e4	346	if (!root_inode)
34ca959c	347	goto fail_ino;
1da177e4	348
1da177e4	349	root = d_alloc_root(root_inode);
1da177e4 LT	350	if (!root)
1da177e4 LT	351	goto fail_iput;
34ca959c IK	352	pipe = NULL;
	353
	354	root->d_op = &autofs4_sb_dentry_operations;
	355	root->d_fsdata = ino;
1da177e4 LT	356
	357	/* Can this call block? */
	358	if (parse_options(data, &pipefd,
	359	&root_inode->i_uid, &root_inode->i_gid,
34ca959c	360	&sbi->oz_pgrp, &sbi->type,
d7c4a5f1	361	&sbi->min_proto, &sbi->max_proto)) {
1da177e4 LT	362	printk("autofs: called with bogus options\n");
	363	goto fail_dput;
	364	}
	365
34ca959c IK	366	root_inode->i_fop = &autofs4_root_operations;
	367	root_inode->i_op = sbi->type & AUTOFS_TYP_DIRECT ?
	368	&autofs4_direct_root_inode_operations :
	369	&autofs4_indirect_root_inode_operations;
	370
1da177e4	371	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	372	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	373	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	374	printk("autofs: kernel does not match daemon version "
1da177e4 LT	375	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	376	sbi->min_proto, sbi->max_proto,
1da177e4 LT	377	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	378	goto fail_dput;
	379	}
	380
d7c4a5f1 IK	381	/* Establish highest kernel protocol version */
	382	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	383	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	384	else
	385	sbi->version = sbi->max_proto;
1da177e4 LT	386	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	387
	388	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	389	pipe = fget(pipefd);
	390
	391	if ( !pipe ) {
	392	printk("autofs: could not open pipe file descriptor\n");
	393	goto fail_dput;
	394	}
	395	if ( !pipe->f_op \|\| !pipe->f_op->write )
	396	goto fail_fput;
	397	sbi->pipe = pipe;
d7c4a5f1	398	sbi->pipefd = pipefd;
1da177e4	399
104e49fc IK	400	/*
	401	* Take a reference to the root dentry so we get a chance to
	402	* clean up the dentry tree on umount.
	403	* See autofs4_force_release.
	404	*/
	405	sbi->root = dget(root);
	406
1da177e4 LT	407	/*
	408	* Success! Install the root dentry now to indicate completion.
	409	*/
	410	s->s_root = root;
	411	return 0;
	412
	413	/*
	414	* Failure ... clean up.
	415	*/
	416	fail_fput:
	417	printk("autofs: pipe file descriptor does not contain proper ops\n");
	418	fput(pipe);
	419	/* fall through */
	420	fail_dput:
	421	dput(root);
	422	goto fail_free;
	423	fail_iput:
	424	printk("autofs: get root dentry failed\n");
	425	iput(root_inode);
34ca959c IK	426	fail_ino:
34ca959c IK	427	kfree(ino);
1da177e4 LT	428	fail_free:
	429	kfree(sbi);
	430	fail_unlock:
	431	return -EINVAL;
	432	}
	433
	434	struct inode autofs4_get_inode(struct super_block sb,
	435	struct autofs_info *inf)
	436	{
	437	struct inode *inode = new_inode(sb);
	438
	439	if (inode == NULL)
	440	return NULL;
	441
	442	inf->inode = inode;
	443	inode->i_mode = inf->mode;
	444	if (sb->s_root) {
	445	inode->i_uid = sb->s_root->d_inode->i_uid;
	446	inode->i_gid = sb->s_root->d_inode->i_gid;
	447	} else {
	448	inode->i_uid = 0;
	449	inode->i_gid = 0;
	450	}
	451	inode->i_blksize = PAGE_CACHE_SIZE;
	452	inode->i_blocks = 0;
	453	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	454
	455	if (S_ISDIR(inf->mode)) {
	456	inode->i_nlink = 2;
	457	inode->i_op = &autofs4_dir_inode_operations;
	458	inode->i_fop = &autofs4_dir_operations;
	459	} else if (S_ISLNK(inf->mode)) {
	460	inode->i_size = inf->size;
	461	inode->i_op = &autofs4_symlink_inode_operations;
	462	}
	463
	464	return inode;
	465	}