[linux-2.6-block.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 <linux/magic.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;

	INIT_LIST_HEAD(&ino->rehash);

	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->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;

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

	/* 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);

	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_TYPE_OFFSET)
		seq_printf(m, ",offset");
	else if (sbi->type & AUTOFS_TYPE_DIRECT)
		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 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_TYPE_INDIRECT;
			break;
		case Opt_direct:
			*type = AUTOFS_TYPE_DIRECT;
			break;
		case Opt_offset:
			*type = AUTOFS_TYPE_DIRECT | AUTOFS_TYPE_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;
}

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 = 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->pipefd = -1;
	sbi->pipe = NULL;
	sbi->catatonic = 1;
	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;
	spin_lock_init(&sbi->rehash_lock);
	INIT_LIST_HEAD(&sbi->rehash_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 = sbi->type & AUTOFS_TYPE_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;
	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;
	} else {
		inode->i_uid = 0;
		inode->i_gid = 0;
	}
	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>
e18fa700	22	#include <linux/magic.h>
1da177e4 LT	23	#include "autofs_i.h"
	24	#include <linux/module.h>
	25
	26	static void ino_lnkfree(struct autofs_info *ino)
	27	{
f99d49ad JJ	28	kfree(ino->u.symlink);
f99d49ad JJ	29	ino->u.symlink = NULL;
1da177e4 LT	30	}
	31
	32	struct autofs_info autofs4_init_ino(struct autofs_info ino,
	33	struct autofs_sb_info *sbi, mode_t mode)
	34	{
	35	int reinit = 1;
	36
	37	if (ino == NULL) {
	38	reinit = 0;
	39	ino = kmalloc(sizeof(*ino), GFP_KERNEL);
	40	}
	41
	42	if (ino == NULL)
	43	return NULL;
	44
	45	ino->flags = 0;
	46	ino->mode = mode;
	47	ino->inode = NULL;
	48	ino->dentry = NULL;
	49	ino->size = 0;
	50
f50b6f86 IK	51	INIT_LIST_HEAD(&ino->rehash);
f50b6f86 IK	52
1da177e4	53	ino->last_used = jiffies;
1aff3c8b	54	atomic_set(&ino->count, 0);
1da177e4 LT	55
	56	ino->sbi = sbi;
	57
	58	if (reinit && ino->free)
	59	(ino->free)(ino);
	60
	61	memset(&ino->u, 0, sizeof(ino->u));
	62
	63	ino->free = NULL;
	64
	65	if (S_ISLNK(mode))
	66	ino->free = ino_lnkfree;
	67
	68	return ino;
	69	}
	70
	71	void autofs4_free_ino(struct autofs_info *ino)
	72	{
1aff3c8b IK	73	struct autofs_info *p_ino;
1aff3c8b IK	74
1da177e4 LT	75	if (ino->dentry) {
1da177e4 LT	76	ino->dentry->d_fsdata = NULL;
1aff3c8b IK	77	if (ino->dentry->d_inode) {
	78	struct dentry *parent = ino->dentry->d_parent;
	79	if (atomic_dec_and_test(&ino->count)) {
	80	p_ino = autofs4_dentry_ino(parent);
	81	if (p_ino && parent != ino->dentry)
	82	atomic_dec(&p_ino->count);
	83	}
1da177e4	84	dput(ino->dentry);
1aff3c8b	85	}
1da177e4 LT	86	ino->dentry = NULL;
	87	}
	88	if (ino->free)
	89	(ino->free)(ino);
	90	kfree(ino);
	91	}
	92
104e49fc IK	93	/*
	94	* Deal with the infamous "Busy inodes after umount ..." message.
	95	*
	96	* Clean up the dentry tree. This happens with autofs if the user
	97	* space program goes away due to a SIGKILL, SIGSEGV etc.
	98	*/
	99	static void autofs4_force_release(struct autofs_sb_info *sbi)
	100	{
6ce31523	101	struct dentry *this_parent = sbi->sb->s_root;
104e49fc IK	102	struct list_head *next;
104e49fc IK	103
ba8df43c IK	104	if (!sbi->sb->s_root)
	105	return;
	106
104e49fc IK	107	spin_lock(&dcache_lock);
	108	repeat:
	109	next = this_parent->d_subdirs.next;
	110	resume:
	111	while (next != &this_parent->d_subdirs) {
5160ee6f	112	struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
104e49fc IK	113
	114	/* Negative dentry - don`t care */
	115	if (!simple_positive(dentry)) {
	116	next = next->next;
	117	continue;
	118	}
	119
	120	if (!list_empty(&dentry->d_subdirs)) {
	121	this_parent = dentry;
	122	goto repeat;
	123	}
	124
	125	next = next->next;
	126	spin_unlock(&dcache_lock);
	127
	128	DPRINTK("dentry %p %.*s",
	129	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	130
	131	dput(dentry);
	132	spin_lock(&dcache_lock);
	133	}
	134
6ce31523	135	if (this_parent != sbi->sb->s_root) {
104e49fc IK	136	struct dentry *dentry = this_parent;
104e49fc IK	137
5160ee6f	138	next = this_parent->d_u.d_child.next;
104e49fc IK	139	this_parent = this_parent->d_parent;
	140	spin_unlock(&dcache_lock);
	141	DPRINTK("parent dentry %p %.*s",
	142	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	143	dput(dentry);
	144	spin_lock(&dcache_lock);
	145	goto resume;
	146	}
	147	spin_unlock(&dcache_lock);
104e49fc IK	148	}
104e49fc IK	149
6ce31523	150	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	151	{
	152	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	153
ba8df43c IK	154	/*
	155	* In the event of a failure in get_sb_nodev the superblock
	156	* info is not present so nothing else has been setup, so
c949d4eb JK	157	* just call kill_anon_super when we are called from
c949d4eb JK	158	* deactivate_super.
ba8df43c IK	159	*/
ba8df43c IK	160	if (!sbi)
c949d4eb	161	goto out_kill_sb;
ba8df43c	162
f50b6f86	163	if (!sbi->catatonic)
1da177e4 LT	164	autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
1da177e4 LT	165
104e49fc	166	/* Clean up and release dangling references */
3370c74b	167	autofs4_force_release(sbi);
104e49fc	168
f50b6f86	169	sb->s_fs_info = NULL;
1da177e4 LT	170	kfree(sbi);
1da177e4 LT	171
c949d4eb	172	out_kill_sb:
1da177e4	173	DPRINTK("shutting down");
6ce31523	174	kill_anon_super(sb);
1da177e4 LT	175	}
1da177e4 LT	176
d7c4a5f1 IK	177	static int autofs4_show_options(struct seq_file m, struct vfsmount mnt)
	178	{
	179	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
	180
	181	if (!sbi)
	182	return 0;
	183
	184	seq_printf(m, ",fd=%d", sbi->pipefd);
	185	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	186	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	187	seq_printf(m, ",minproto=%d", sbi->min_proto);
	188	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	189
44d53eb0	190	if (sbi->type & AUTOFS_TYPE_OFFSET)
34ca959c	191	seq_printf(m, ",offset");
44d53eb0	192	else if (sbi->type & AUTOFS_TYPE_DIRECT)
34ca959c IK	193	seq_printf(m, ",direct");
	194	else
	195	seq_printf(m, ",indirect");
	196
d7c4a5f1 IK	197	return 0;
	198	}
	199
ee9b6d61	200	static const struct super_operations autofs4_sops = {
1da177e4	201	.statfs = simple_statfs,
d7c4a5f1	202	.show_options = autofs4_show_options,
1da177e4 LT	203	};
1da177e4 LT	204
34ca959c IK	205	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	206	Opt_indirect, Opt_direct, Opt_offset};
1da177e4 LT	207
	208	static match_table_t tokens = {
	209	{Opt_fd, "fd=%u"},
	210	{Opt_uid, "uid=%u"},
	211	{Opt_gid, "gid=%u"},
	212	{Opt_pgrp, "pgrp=%u"},
	213	{Opt_minproto, "minproto=%u"},
	214	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	215	{Opt_indirect, "indirect"},
	216	{Opt_direct, "direct"},
	217	{Opt_offset, "offset"},
1da177e4 LT	218	{Opt_err, NULL}
	219	};
	220
	221	static int parse_options(char options, int pipefd, uid_t uid, gid_t gid,
34ca959c IK	222	pid_t pgrp, unsigned int type,
34ca959c IK	223	int minproto, int maxproto)
1da177e4 LT	224	{
	225	char *p;
	226	substring_t args[MAX_OPT_ARGS];
	227	int option;
	228
	229	*uid = current->uid;
	230	*gid = current->gid;
	231	*pgrp = process_group(current);
	232
	233	*minproto = AUTOFS_MIN_PROTO_VERSION;
	234	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	235
	236	*pipefd = -1;
	237
	238	if (!options)
	239	return 1;
	240
	241	while ((p = strsep(&options, ",")) != NULL) {
	242	int token;
	243	if (!*p)
	244	continue;
	245
	246	token = match_token(p, tokens, args);
	247	switch (token) {
	248	case Opt_fd:
	249	if (match_int(args, pipefd))
	250	return 1;
	251	break;
	252	case Opt_uid:
	253	if (match_int(args, &option))
	254	return 1;
	255	*uid = option;
	256	break;
	257	case Opt_gid:
	258	if (match_int(args, &option))
	259	return 1;
	260	*gid = option;
	261	break;
	262	case Opt_pgrp:
	263	if (match_int(args, &option))
	264	return 1;
	265	*pgrp = option;
	266	break;
	267	case Opt_minproto:
	268	if (match_int(args, &option))
	269	return 1;
	270	*minproto = option;
	271	break;
	272	case Opt_maxproto:
	273	if (match_int(args, &option))
	274	return 1;
	275	*maxproto = option;
	276	break;
34ca959c	277	case Opt_indirect:
44d53eb0	278	*type = AUTOFS_TYPE_INDIRECT;
34ca959c IK	279	break;
34ca959c IK	280	case Opt_direct:
44d53eb0	281	*type = AUTOFS_TYPE_DIRECT;
34ca959c IK	282	break;
34ca959c IK	283	case Opt_offset:
44d53eb0	284	*type = AUTOFS_TYPE_DIRECT \| AUTOFS_TYPE_OFFSET;
34ca959c	285	break;
1da177e4 LT	286	default:
	287	return 1;
	288	}
	289	}
	290	return (*pipefd < 0);
	291	}
	292
	293	static struct autofs_info autofs4_mkroot(struct autofs_sb_info sbi)
	294	{
	295	struct autofs_info *ino;
	296
	297	ino = autofs4_init_ino(NULL, sbi, S_IFDIR \| 0755);
	298	if (!ino)
	299	return NULL;
	300
	301	return ino;
	302	}
	303
34ca959c IK	304	static struct dentry_operations autofs4_sb_dentry_operations = {
	305	.d_release = autofs4_dentry_release,
	306	};
	307
1da177e4 LT	308	int autofs4_fill_super(struct super_block s, void data, int silent)
	309	{
	310	struct inode * root_inode;
	311	struct dentry * root;
	312	struct file * pipe;
	313	int pipefd;
	314	struct autofs_sb_info *sbi;
	315	struct autofs_info *ino;
1da177e4	316
5cbded58	317	sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4 LT	318	if ( !sbi )
	319	goto fail_unlock;
	320	DPRINTK("starting up, sbi = %p",sbi);
	321
	322	memset(sbi, 0, sizeof(*sbi));
	323
	324	s->s_fs_info = sbi;
	325	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	326	sbi->pipefd = -1;
ba8df43c IK	327	sbi->pipe = NULL;
ba8df43c IK	328	sbi->catatonic = 1;
1da177e4 LT	329	sbi->exp_timeout = 0;
	330	sbi->oz_pgrp = process_group(current);
	331	sbi->sb = s;
	332	sbi->version = 0;
	333	sbi->sub_version = 0;
34ca959c	334	sbi->type = 0;
d7c4a5f1 IK	335	sbi->min_proto = 0;
d7c4a5f1 IK	336	sbi->max_proto = 0;
1d5599e3	337	mutex_init(&sbi->wq_mutex);
3a9720ce	338	spin_lock_init(&sbi->fs_lock);
1da177e4	339	sbi->queues = NULL;
f50b6f86 IK	340	spin_lock_init(&sbi->rehash_lock);
f50b6f86 IK	341	INIT_LIST_HEAD(&sbi->rehash_list);
1da177e4 LT	342	s->s_blocksize = 1024;
	343	s->s_blocksize_bits = 10;
	344	s->s_magic = AUTOFS_SUPER_MAGIC;
	345	s->s_op = &autofs4_sops;
	346	s->s_time_gran = 1;
	347
	348	/*
	349	* Get the root inode and dentry, but defer checking for errors.
	350	*/
	351	ino = autofs4_mkroot(sbi);
	352	if (!ino)
	353	goto fail_free;
	354	root_inode = autofs4_get_inode(s, ino);
1da177e4	355	if (!root_inode)
34ca959c	356	goto fail_ino;
1da177e4	357
1da177e4	358	root = d_alloc_root(root_inode);
1da177e4 LT	359	if (!root)
1da177e4 LT	360	goto fail_iput;
34ca959c IK	361	pipe = NULL;
	362
	363	root->d_op = &autofs4_sb_dentry_operations;
	364	root->d_fsdata = ino;
1da177e4 LT	365
	366	/* Can this call block? */
	367	if (parse_options(data, &pipefd,
	368	&root_inode->i_uid, &root_inode->i_gid,
34ca959c	369	&sbi->oz_pgrp, &sbi->type,
d7c4a5f1	370	&sbi->min_proto, &sbi->max_proto)) {
1da177e4 LT	371	printk("autofs: called with bogus options\n");
	372	goto fail_dput;
	373	}
	374
34ca959c	375	root_inode->i_fop = &autofs4_root_operations;
44d53eb0	376	root_inode->i_op = sbi->type & AUTOFS_TYPE_DIRECT ?
34ca959c IK	377	&autofs4_direct_root_inode_operations :
	378	&autofs4_indirect_root_inode_operations;
	379
1da177e4	380	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	381	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	382	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	383	printk("autofs: kernel does not match daemon version "
1da177e4 LT	384	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	385	sbi->min_proto, sbi->max_proto,
1da177e4 LT	386	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	387	goto fail_dput;
	388	}
	389
d7c4a5f1 IK	390	/* Establish highest kernel protocol version */
	391	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	392	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	393	else
	394	sbi->version = sbi->max_proto;
1da177e4 LT	395	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	396
	397	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	398	pipe = fget(pipefd);
	399
	400	if ( !pipe ) {
	401	printk("autofs: could not open pipe file descriptor\n");
	402	goto fail_dput;
	403	}
	404	if ( !pipe->f_op \|\| !pipe->f_op->write )
	405	goto fail_fput;
	406	sbi->pipe = pipe;
d7c4a5f1	407	sbi->pipefd = pipefd;
ba8df43c	408	sbi->catatonic = 0;
1da177e4 LT	409
	410	/*
	411	* Success! Install the root dentry now to indicate completion.
	412	*/
	413	s->s_root = root;
	414	return 0;
	415
	416	/*
	417	* Failure ... clean up.
	418	*/
	419	fail_fput:
	420	printk("autofs: pipe file descriptor does not contain proper ops\n");
	421	fput(pipe);
	422	/* fall through */
	423	fail_dput:
	424	dput(root);
	425	goto fail_free;
	426	fail_iput:
	427	printk("autofs: get root dentry failed\n");
	428	iput(root_inode);
34ca959c IK	429	fail_ino:
34ca959c IK	430	kfree(ino);
1da177e4 LT	431	fail_free:
1da177e4 LT	432	kfree(sbi);
ba8df43c	433	s->s_fs_info = NULL;
1da177e4 LT	434	fail_unlock:
	435	return -EINVAL;
	436	}
	437
	438	struct inode autofs4_get_inode(struct super_block sb,
	439	struct autofs_info *inf)
	440	{
	441	struct inode *inode = new_inode(sb);
	442
	443	if (inode == NULL)
	444	return NULL;
	445
	446	inf->inode = inode;
	447	inode->i_mode = inf->mode;
	448	if (sb->s_root) {
	449	inode->i_uid = sb->s_root->d_inode->i_uid;
	450	inode->i_gid = sb->s_root->d_inode->i_gid;
	451	} else {
	452	inode->i_uid = 0;
	453	inode->i_gid = 0;
	454	}
1da177e4 LT	455	inode->i_blocks = 0;
	456	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	457
	458	if (S_ISDIR(inf->mode)) {
	459	inode->i_nlink = 2;
	460	inode->i_op = &autofs4_dir_inode_operations;
	461	inode->i_fop = &autofs4_dir_operations;
	462	} else if (S_ISLNK(inf->mode)) {
	463	inode->i_size = inf->size;
	464	inode->i_op = &autofs4_symlink_inode_operations;
	465	}
	466
	467	return inode;
	468	}