[linux.git] / fs / autofs4 / inode.c

/* -*- c -*- --------------------------------------------------------------- *
 *
 * linux/fs/autofs/inode.c
 *
 *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
 *  Copyright 2005-2006 Ian Kent <[email protected]>
 *
 * 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)
{
	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 <[email protected]>
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	{
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
f50b6f86 IK	50	INIT_LIST_HEAD(&ino->rehash);
f50b6f86 IK	51
1da177e4	52	ino->last_used = jiffies;
1aff3c8b	53	atomic_set(&ino->count, 0);
1da177e4 LT	54
	55	ino->sbi = sbi;
	56
	57	if (reinit && ino->free)
	58	(ino->free)(ino);
	59
	60	memset(&ino->u, 0, sizeof(ino->u));
	61
	62	ino->free = NULL;
	63
	64	if (S_ISLNK(mode))
	65	ino->free = ino_lnkfree;
	66
	67	return ino;
	68	}
	69
	70	void autofs4_free_ino(struct autofs_info *ino)
	71	{
1aff3c8b IK	72	struct autofs_info *p_ino;
1aff3c8b IK	73
1da177e4 LT	74	if (ino->dentry) {
1da177e4 LT	75	ino->dentry->d_fsdata = NULL;
1aff3c8b IK	76	if (ino->dentry->d_inode) {
	77	struct dentry *parent = ino->dentry->d_parent;
	78	if (atomic_dec_and_test(&ino->count)) {
	79	p_ino = autofs4_dentry_ino(parent);
	80	if (p_ino && parent != ino->dentry)
	81	atomic_dec(&p_ino->count);
	82	}
1da177e4	83	dput(ino->dentry);
1aff3c8b	84	}
1da177e4 LT	85	ino->dentry = NULL;
	86	}
	87	if (ino->free)
	88	(ino->free)(ino);
	89	kfree(ino);
	90	}
	91
104e49fc IK	92	/*
	93	* Deal with the infamous "Busy inodes after umount ..." message.
	94	*
	95	* Clean up the dentry tree. This happens with autofs if the user
	96	* space program goes away due to a SIGKILL, SIGSEGV etc.
	97	*/
	98	static void autofs4_force_release(struct autofs_sb_info *sbi)
	99	{
6ce31523	100	struct dentry *this_parent = sbi->sb->s_root;
104e49fc IK	101	struct list_head *next;
104e49fc IK	102
ba8df43c IK	103	if (!sbi->sb->s_root)
	104	return;
	105
104e49fc IK	106	spin_lock(&dcache_lock);
	107	repeat:
	108	next = this_parent->d_subdirs.next;
	109	resume:
	110	while (next != &this_parent->d_subdirs) {
5160ee6f	111	struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
104e49fc IK	112
	113	/* Negative dentry - don`t care */
	114	if (!simple_positive(dentry)) {
	115	next = next->next;
	116	continue;
	117	}
	118
	119	if (!list_empty(&dentry->d_subdirs)) {
	120	this_parent = dentry;
	121	goto repeat;
	122	}
	123
	124	next = next->next;
	125	spin_unlock(&dcache_lock);
	126
	127	DPRINTK("dentry %p %.*s",
	128	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	129
	130	dput(dentry);
	131	spin_lock(&dcache_lock);
	132	}
	133
6ce31523	134	if (this_parent != sbi->sb->s_root) {
104e49fc IK	135	struct dentry *dentry = this_parent;
104e49fc IK	136
5160ee6f	137	next = this_parent->d_u.d_child.next;
104e49fc IK	138	this_parent = this_parent->d_parent;
	139	spin_unlock(&dcache_lock);
	140	DPRINTK("parent dentry %p %.*s",
	141	dentry, (int)dentry->d_name.len, dentry->d_name.name);
	142	dput(dentry);
	143	spin_lock(&dcache_lock);
	144	goto resume;
	145	}
	146	spin_unlock(&dcache_lock);
104e49fc IK	147	}
104e49fc IK	148
6ce31523	149	void autofs4_kill_sb(struct super_block *sb)
1da177e4 LT	150	{
	151	struct autofs_sb_info *sbi = autofs4_sbi(sb);
	152
ba8df43c IK	153	/*
	154	* In the event of a failure in get_sb_nodev the superblock
	155	* info is not present so nothing else has been setup, so
c949d4eb JK	156	* just call kill_anon_super when we are called from
c949d4eb JK	157	* deactivate_super.
ba8df43c IK	158	*/
ba8df43c IK	159	if (!sbi)
c949d4eb	160	goto out_kill_sb;
ba8df43c	161
f50b6f86	162	if (!sbi->catatonic)
1da177e4 LT	163	autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
1da177e4 LT	164
104e49fc	165	/* Clean up and release dangling references */
3370c74b	166	autofs4_force_release(sbi);
104e49fc	167
f50b6f86	168	sb->s_fs_info = NULL;
1da177e4 LT	169	kfree(sbi);
1da177e4 LT	170
c949d4eb	171	out_kill_sb:
1da177e4	172	DPRINTK("shutting down");
6ce31523	173	kill_anon_super(sb);
1da177e4 LT	174	}
1da177e4 LT	175
d7c4a5f1 IK	176	static int autofs4_show_options(struct seq_file m, struct vfsmount mnt)
	177	{
	178	struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
	179
	180	if (!sbi)
	181	return 0;
	182
	183	seq_printf(m, ",fd=%d", sbi->pipefd);
	184	seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
	185	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
	186	seq_printf(m, ",minproto=%d", sbi->min_proto);
	187	seq_printf(m, ",maxproto=%d", sbi->max_proto);
	188
44d53eb0	189	if (sbi->type & AUTOFS_TYPE_OFFSET)
34ca959c	190	seq_printf(m, ",offset");
44d53eb0	191	else if (sbi->type & AUTOFS_TYPE_DIRECT)
34ca959c IK	192	seq_printf(m, ",direct");
	193	else
	194	seq_printf(m, ",indirect");
	195
d7c4a5f1 IK	196	return 0;
	197	}
	198
ee9b6d61	199	static const struct super_operations autofs4_sops = {
1da177e4	200	.statfs = simple_statfs,
d7c4a5f1	201	.show_options = autofs4_show_options,
1da177e4 LT	202	};
1da177e4 LT	203
34ca959c IK	204	enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
34ca959c IK	205	Opt_indirect, Opt_direct, Opt_offset};
1da177e4 LT	206
	207	static match_table_t tokens = {
	208	{Opt_fd, "fd=%u"},
	209	{Opt_uid, "uid=%u"},
	210	{Opt_gid, "gid=%u"},
	211	{Opt_pgrp, "pgrp=%u"},
	212	{Opt_minproto, "minproto=%u"},
	213	{Opt_maxproto, "maxproto=%u"},
34ca959c IK	214	{Opt_indirect, "indirect"},
	215	{Opt_direct, "direct"},
	216	{Opt_offset, "offset"},
1da177e4 LT	217	{Opt_err, NULL}
	218	};
	219
	220	static int parse_options(char options, int pipefd, uid_t uid, gid_t gid,
d78e53c8	221	pid_t pgrp, unsigned int type, int minproto, int maxproto)
1da177e4 LT	222	{
	223	char *p;
	224	substring_t args[MAX_OPT_ARGS];
	225	int option;
	226
	227	*uid = current->uid;
	228	*gid = current->gid;
	229	*pgrp = process_group(current);
	230
	231	*minproto = AUTOFS_MIN_PROTO_VERSION;
	232	*maxproto = AUTOFS_MAX_PROTO_VERSION;
	233
	234	*pipefd = -1;
	235
	236	if (!options)
	237	return 1;
	238
	239	while ((p = strsep(&options, ",")) != NULL) {
	240	int token;
	241	if (!*p)
	242	continue;
	243
	244	token = match_token(p, tokens, args);
	245	switch (token) {
	246	case Opt_fd:
	247	if (match_int(args, pipefd))
	248	return 1;
	249	break;
	250	case Opt_uid:
	251	if (match_int(args, &option))
	252	return 1;
	253	*uid = option;
	254	break;
	255	case Opt_gid:
	256	if (match_int(args, &option))
	257	return 1;
	258	*gid = option;
	259	break;
	260	case Opt_pgrp:
	261	if (match_int(args, &option))
	262	return 1;
	263	*pgrp = option;
	264	break;
	265	case Opt_minproto:
	266	if (match_int(args, &option))
	267	return 1;
	268	*minproto = option;
	269	break;
	270	case Opt_maxproto:
	271	if (match_int(args, &option))
	272	return 1;
	273	*maxproto = option;
	274	break;
34ca959c	275	case Opt_indirect:
44d53eb0	276	*type = AUTOFS_TYPE_INDIRECT;
34ca959c IK	277	break;
34ca959c IK	278	case Opt_direct:
44d53eb0	279	*type = AUTOFS_TYPE_DIRECT;
34ca959c IK	280	break;
34ca959c IK	281	case Opt_offset:
44d53eb0	282	*type = AUTOFS_TYPE_DIRECT \| AUTOFS_TYPE_OFFSET;
34ca959c	283	break;
1da177e4 LT	284	default:
	285	return 1;
	286	}
	287	}
	288	return (*pipefd < 0);
	289	}
	290
	291	static struct autofs_info autofs4_mkroot(struct autofs_sb_info sbi)
	292	{
	293	struct autofs_info *ino;
	294
	295	ino = autofs4_init_ino(NULL, sbi, S_IFDIR \| 0755);
	296	if (!ino)
	297	return NULL;
	298
	299	return ino;
	300	}
	301
34ca959c IK	302	static struct dentry_operations autofs4_sb_dentry_operations = {
	303	.d_release = autofs4_dentry_release,
	304	};
	305
1da177e4 LT	306	int autofs4_fill_super(struct super_block s, void data, int silent)
	307	{
	308	struct inode * root_inode;
	309	struct dentry * root;
	310	struct file * pipe;
	311	int pipefd;
	312	struct autofs_sb_info *sbi;
	313	struct autofs_info *ino;
1da177e4	314
5cbded58	315	sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
d78e53c8	316	if (!sbi)
1da177e4 LT	317	goto fail_unlock;
	318	DPRINTK("starting up, sbi = %p",sbi);
	319
	320	memset(sbi, 0, sizeof(*sbi));
	321
	322	s->s_fs_info = sbi;
	323	sbi->magic = AUTOFS_SBI_MAGIC;
d7c4a5f1	324	sbi->pipefd = -1;
ba8df43c IK	325	sbi->pipe = NULL;
ba8df43c IK	326	sbi->catatonic = 1;
1da177e4 LT	327	sbi->exp_timeout = 0;
	328	sbi->oz_pgrp = process_group(current);
	329	sbi->sb = s;
	330	sbi->version = 0;
	331	sbi->sub_version = 0;
34ca959c	332	sbi->type = 0;
d7c4a5f1 IK	333	sbi->min_proto = 0;
d7c4a5f1 IK	334	sbi->max_proto = 0;
1d5599e3	335	mutex_init(&sbi->wq_mutex);
3a9720ce	336	spin_lock_init(&sbi->fs_lock);
1da177e4	337	sbi->queues = NULL;
f50b6f86 IK	338	spin_lock_init(&sbi->rehash_lock);
f50b6f86 IK	339	INIT_LIST_HEAD(&sbi->rehash_list);
1da177e4 LT	340	s->s_blocksize = 1024;
	341	s->s_blocksize_bits = 10;
	342	s->s_magic = AUTOFS_SUPER_MAGIC;
	343	s->s_op = &autofs4_sops;
	344	s->s_time_gran = 1;
	345
	346	/*
	347	* Get the root inode and dentry, but defer checking for errors.
	348	*/
	349	ino = autofs4_mkroot(sbi);
	350	if (!ino)
	351	goto fail_free;
	352	root_inode = autofs4_get_inode(s, ino);
1da177e4	353	if (!root_inode)
34ca959c	354	goto fail_ino;
1da177e4	355
1da177e4	356	root = d_alloc_root(root_inode);
1da177e4 LT	357	if (!root)
1da177e4 LT	358	goto fail_iput;
34ca959c IK	359	pipe = NULL;
	360
	361	root->d_op = &autofs4_sb_dentry_operations;
	362	root->d_fsdata = ino;
1da177e4 LT	363
1da177e4 LT	364	/* Can this call block? */
d78e53c8 SB	365	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
	366	&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
	367	&sbi->max_proto)) {
1da177e4 LT	368	printk("autofs: called with bogus options\n");
	369	goto fail_dput;
	370	}
	371
34ca959c	372	root_inode->i_fop = &autofs4_root_operations;
44d53eb0	373	root_inode->i_op = sbi->type & AUTOFS_TYPE_DIRECT ?
34ca959c IK	374	&autofs4_direct_root_inode_operations :
	375	&autofs4_indirect_root_inode_operations;
	376
1da177e4	377	/* Couldn't this be tested earlier? */
d7c4a5f1 IK	378	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION \|\|
d7c4a5f1 IK	379	sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
1da177e4 LT	380	printk("autofs: kernel does not match daemon version "
1da177e4 LT	381	"daemon (%d, %d) kernel (%d, %d)\n",
d7c4a5f1	382	sbi->min_proto, sbi->max_proto,
1da177e4 LT	383	AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
	384	goto fail_dput;
	385	}
	386
d7c4a5f1 IK	387	/* Establish highest kernel protocol version */
	388	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
	389	sbi->version = AUTOFS_MAX_PROTO_VERSION;
	390	else
	391	sbi->version = sbi->max_proto;
1da177e4 LT	392	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
	393
	394	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	395	pipe = fget(pipefd);
	396
d78e53c8	397	if (!pipe) {
1da177e4 LT	398	printk("autofs: could not open pipe file descriptor\n");
	399	goto fail_dput;
	400	}
d78e53c8	401	if (!pipe->f_op \|\| !pipe->f_op->write)
1da177e4 LT	402	goto fail_fput;
1da177e4 LT	403	sbi->pipe = pipe;
d7c4a5f1	404	sbi->pipefd = pipefd;
ba8df43c	405	sbi->catatonic = 0;
1da177e4 LT	406
	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:
1da177e4 LT	429	kfree(sbi);
ba8df43c	430	s->s_fs_info = NULL;
1da177e4 LT	431	fail_unlock:
	432	return -EINVAL;
	433	}
	434
	435	struct inode autofs4_get_inode(struct super_block sb,
	436	struct autofs_info *inf)
	437	{
	438	struct inode *inode = new_inode(sb);
	439
	440	if (inode == NULL)
	441	return NULL;
	442
	443	inf->inode = inode;
	444	inode->i_mode = inf->mode;
	445	if (sb->s_root) {
	446	inode->i_uid = sb->s_root->d_inode->i_uid;
	447	inode->i_gid = sb->s_root->d_inode->i_gid;
	448	} else {
	449	inode->i_uid = 0;
	450	inode->i_gid = 0;
	451	}
1da177e4 LT	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	}