[deliverable/linux.git] / fs / hppfs / hppfs_kern.c

/*
 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include <linux/fs.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/dcache.h>
#include <linux/statfs.h>
#include <asm/uaccess.h>
#include <asm/fcntl.h>
#include "os.h"

static int init_inode(struct inode *inode, struct dentry *dentry);

struct hppfs_data {
	struct list_head list;
	char contents[PAGE_SIZE - sizeof(struct list_head)];
};

struct hppfs_private {
	struct file *proc_file;
	int host_fd;
	loff_t len;
	struct hppfs_data *contents;
};

struct hppfs_inode_info {
        struct dentry *proc_dentry;
	struct inode vfs_inode;
};

static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
{
	return container_of(inode, struct hppfs_inode_info, vfs_inode);
}

#define HPPFS_SUPER_MAGIC 0xb00000ee

static const struct super_operations hppfs_sbops;

static int is_pid(struct dentry *dentry)
{
	struct super_block *sb;
	int i;

	sb = dentry->d_sb;
	if((sb->s_op != &hppfs_sbops) || (dentry->d_parent != sb->s_root))
		return(0);

	for(i = 0; i < dentry->d_name.len; i++){
		if(!isdigit(dentry->d_name.name[i]))
			return(0);
	}
	return(1);
}

static char *dentry_name(struct dentry *dentry, int extra)
{
	struct dentry *parent;
	char *root, *name;
	const char *seg_name;
	int len, seg_len;

	len = 0;
	parent = dentry;
	while(parent->d_parent != parent){
		if(is_pid(parent))
			len += strlen("pid") + 1;
		else len += parent->d_name.len + 1;
		parent = parent->d_parent;
	}

	root = "proc";
	len += strlen(root);
	name = kmalloc(len + extra + 1, GFP_KERNEL);
	if(name == NULL) return(NULL);

	name[len] = '\0';
	parent = dentry;
	while(parent->d_parent != parent){
		if(is_pid(parent)){
			seg_name = "pid";
			seg_len = strlen("pid");
		}
		else {
			seg_name = parent->d_name.name;
			seg_len = parent->d_name.len;
		}

		len -= seg_len + 1;
		name[len] = '/';
		strncpy(&name[len + 1], seg_name, seg_len);
		parent = parent->d_parent;
	}
	strncpy(name, root, strlen(root));
	return(name);
}

struct dentry_operations hppfs_dentry_ops = {
};

static int file_removed(struct dentry *dentry, const char *file)
{
	char *host_file;
	int extra, fd;

	extra = 0;
	if(file != NULL) extra += strlen(file) + 1;

	host_file = dentry_name(dentry, extra + strlen("/remove"));
	if(host_file == NULL){
		printk("file_removed : allocation failed\n");
		return(-ENOMEM);
	}

	if(file != NULL){
		strcat(host_file, "/");
		strcat(host_file, file);
	}
	strcat(host_file, "/remove");

	fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
	kfree(host_file);
	if(fd > 0){
		os_close_file(fd);
		return(1);
	}
	return(0);
}

static void hppfs_read_inode(struct inode *ino)
{
	struct inode *proc_ino;

	if(HPPFS_I(ino)->proc_dentry == NULL)
		return;

	proc_ino = HPPFS_I(ino)->proc_dentry->d_inode;
	ino->i_uid = proc_ino->i_uid;
	ino->i_gid = proc_ino->i_gid;
	ino->i_atime = proc_ino->i_atime;
	ino->i_mtime = proc_ino->i_mtime;
	ino->i_ctime = proc_ino->i_ctime;
	ino->i_ino = proc_ino->i_ino;
	ino->i_mode = proc_ino->i_mode;
	ino->i_nlink = proc_ino->i_nlink;
	ino->i_size = proc_ino->i_size;
	ino->i_blocks = proc_ino->i_blocks;
}

static struct inode *hppfs_iget(struct super_block *sb)
{
	struct inode *inode;

	inode = iget_locked(sb, 0);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (inode->i_state & I_NEW) {
		hppfs_read_inode(inode);
		unlock_new_inode(inode);
	}
	return inode;
}

static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
                                  struct nameidata *nd)
{
	struct dentry *proc_dentry, *new, *parent;
	struct inode *inode;
	int err, deleted;

	deleted = file_removed(dentry, NULL);
	if(deleted < 0)
		return(ERR_PTR(deleted));
	else if(deleted)
		return(ERR_PTR(-ENOENT));

	err = -ENOMEM;
	parent = HPPFS_I(ino)->proc_dentry;
	mutex_lock(&parent->d_inode->i_mutex);
	proc_dentry = d_lookup(parent, &dentry->d_name);
	if(proc_dentry == NULL){
		proc_dentry = d_alloc(parent, &dentry->d_name);
		if(proc_dentry == NULL){
			mutex_unlock(&parent->d_inode->i_mutex);
			goto out;
		}
		new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
						       proc_dentry, NULL);
		if(new){
			dput(proc_dentry);
			proc_dentry = new;
		}
	}
	mutex_unlock(&parent->d_inode->i_mutex);

	if(IS_ERR(proc_dentry))
		return(proc_dentry);

	inode = hppfs_iget(ino->i_sb);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		goto out_dput;
	}

	err = init_inode(inode, proc_dentry);
	if(err)
		goto out_put;

	hppfs_read_inode(inode);

 	d_add(dentry, inode);
	dentry->d_op = &hppfs_dentry_ops;
	return(NULL);

 out_put:
	iput(inode);
 out_dput:
	dput(proc_dentry);
 out:
	return(ERR_PTR(err));
}

static const struct inode_operations hppfs_file_iops = {
};

static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
			 loff_t *ppos, int is_user)
{
	ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
	ssize_t n;

	read = file->f_path.dentry->d_inode->i_fop->read;

	if(!is_user)
		set_fs(KERNEL_DS);

	n = (*read)(file, buf, count, &file->f_pos);

	if(!is_user)
		set_fs(USER_DS);

	if(ppos) *ppos = file->f_pos;
	return n;
}

static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
{
	ssize_t n;
	int cur, err;
	char *new_buf;

	n = -ENOMEM;
	new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if(new_buf == NULL){
		printk("hppfs_read_file : kmalloc failed\n");
		goto out;
	}
	n = 0;
	while(count > 0){
		cur = min_t(ssize_t, count, PAGE_SIZE);
		err = os_read_file(fd, new_buf, cur);
		if(err < 0){
			printk("hppfs_read : read failed, errno = %d\n",
			       err);
			n = err;
			goto out_free;
		}
		else if(err == 0)
			break;

		if(copy_to_user(buf, new_buf, err)){
			n = -EFAULT;
			goto out_free;
		}
		n += err;
		count -= err;
	}
 out_free:
	kfree(new_buf);
 out:
	return n;
}

static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
			  loff_t *ppos)
{
	struct hppfs_private *hppfs = file->private_data;
	struct hppfs_data *data;
	loff_t off;
	int err;

	if(hppfs->contents != NULL){
		if(*ppos >= hppfs->len) return(0);

		data = hppfs->contents;
		off = *ppos;
		while(off >= sizeof(data->contents)){
			data = list_entry(data->list.next, struct hppfs_data,
					  list);
			off -= sizeof(data->contents);
		}

		if(off + count > hppfs->len)
			count = hppfs->len - off;
		copy_to_user(buf, &data->contents[off], count);
		*ppos += count;
	}
	else if(hppfs->host_fd != -1){
		err = os_seek_file(hppfs->host_fd, *ppos);
		if(err){
			printk("hppfs_read : seek failed, errno = %d\n", err);
			return(err);
		}
		count = hppfs_read_file(hppfs->host_fd, buf, count);
		if(count > 0)
			*ppos += count;
	}
	else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);

	return(count);
}

static ssize_t hppfs_write(struct file *file, const char __user *buf, size_t len,
			   loff_t *ppos)
{
	struct hppfs_private *data = file->private_data;
	struct file *proc_file = data->proc_file;
	ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
	int err;

	write = proc_file->f_path.dentry->d_inode->i_fop->write;

	proc_file->f_pos = file->f_pos;
	err = (*write)(proc_file, buf, len, &proc_file->f_pos);
	file->f_pos = proc_file->f_pos;

	return(err);
}

static int open_host_sock(char *host_file, int *filter_out)
{
	char *end;
	int fd;

	end = &host_file[strlen(host_file)];
	strcpy(end, "/rw");
	*filter_out = 1;
	fd = os_connect_socket(host_file);
	if(fd > 0)
		return(fd);

	strcpy(end, "/r");
	*filter_out = 0;
	fd = os_connect_socket(host_file);
	return(fd);
}

static void free_contents(struct hppfs_data *head)
{
	struct hppfs_data *data;
	struct list_head *ele, *next;

	if(head == NULL) return;

	list_for_each_safe(ele, next, &head->list){
		data = list_entry(ele, struct hppfs_data, list);
		kfree(data);
	}
	kfree(head);
}

static struct hppfs_data *hppfs_get_data(int fd, int filter,
					 struct file *proc_file,
					 struct file *hppfs_file,
					 loff_t *size_out)
{
	struct hppfs_data *data, *new, *head;
	int n, err;

	err = -ENOMEM;
	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if(data == NULL){
		printk("hppfs_get_data : head allocation failed\n");
		goto failed;
	}

	INIT_LIST_HEAD(&data->list);

	head = data;
	*size_out = 0;

	if(filter){
		while((n = read_proc(proc_file, data->contents,
				     sizeof(data->contents), NULL, 0)) > 0)
			os_write_file(fd, data->contents, n);
		err = os_shutdown_socket(fd, 0, 1);
		if(err){
			printk("hppfs_get_data : failed to shut down "
			       "socket\n");
			goto failed_free;
		}
	}
	while(1){
		n = os_read_file(fd, data->contents, sizeof(data->contents));
		if(n < 0){
			err = n;
			printk("hppfs_get_data : read failed, errno = %d\n",
			       err);
			goto failed_free;
		}
		else if(n == 0)
			break;

		*size_out += n;

		if(n < sizeof(data->contents))
			break;

		new = kmalloc(sizeof(*data), GFP_KERNEL);
		if(new == 0){
			printk("hppfs_get_data : data allocation failed\n");
			err = -ENOMEM;
			goto failed_free;
		}

		INIT_LIST_HEAD(&new->list);
		list_add(&new->list, &data->list);
		data = new;
	}
	return(head);

 failed_free:
	free_contents(head);
 failed:
	return(ERR_PTR(err));
}

static struct hppfs_private *hppfs_data(void)
{
	struct hppfs_private *data;

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if(data == NULL)
		return(data);

	*data = ((struct hppfs_private ) { .host_fd  		= -1,
					   .len  		= -1,
					   .contents 		= NULL } );
	return(data);
}

static int file_mode(int fmode)
{
	if(fmode == (FMODE_READ | FMODE_WRITE))
		return(O_RDWR);
	if(fmode == FMODE_READ)
		return(O_RDONLY);
	if(fmode == FMODE_WRITE)
		return(O_WRONLY);
	return(0);
}

static int hppfs_open(struct inode *inode, struct file *file)
{
	struct hppfs_private *data;
	struct dentry *proc_dentry;
	char *host_file;
	int err, fd, type, filter;

	err = -ENOMEM;
	data = hppfs_data();
	if(data == NULL)
		goto out;

	host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
	if(host_file == NULL)
		goto out_free2;

	proc_dentry = HPPFS_I(inode)->proc_dentry;

	/* XXX This isn't closed anywhere */
	data->proc_file = dentry_open(dget(proc_dentry), NULL,
				      file_mode(file->f_mode));
	err = PTR_ERR(data->proc_file);
	if(IS_ERR(data->proc_file))
		goto out_free1;

	type = os_file_type(host_file);
	if(type == OS_TYPE_FILE){
		fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
		if(fd >= 0)
			data->host_fd = fd;
		else printk("hppfs_open : failed to open '%s', errno = %d\n",
			    host_file, -fd);

		data->contents = NULL;
	}
	else if(type == OS_TYPE_DIR){
		fd = open_host_sock(host_file, &filter);
		if(fd > 0){
			data->contents = hppfs_get_data(fd, filter,
							data->proc_file,
							file, &data->len);
			if(!IS_ERR(data->contents))
				data->host_fd = fd;
		}
		else printk("hppfs_open : failed to open a socket in "
			    "'%s', errno = %d\n", host_file, -fd);
	}
	kfree(host_file);

	file->private_data = data;
	return(0);

 out_free1:
	kfree(host_file);
 out_free2:
	free_contents(data->contents);
	kfree(data);
 out:
	return(err);
}

static int hppfs_dir_open(struct inode *inode, struct file *file)
{
	struct hppfs_private *data;
	struct dentry *proc_dentry;
	int err;

	err = -ENOMEM;
	data = hppfs_data();
	if(data == NULL)
		goto out;

	proc_dentry = HPPFS_I(inode)->proc_dentry;
	data->proc_file = dentry_open(dget(proc_dentry), NULL,
				      file_mode(file->f_mode));
	err = PTR_ERR(data->proc_file);
	if(IS_ERR(data->proc_file))
		goto out_free;

	file->private_data = data;
	return(0);

 out_free:
	kfree(data);
 out:
	return(err);
}

static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
{
	struct hppfs_private *data = file->private_data;
	struct file *proc_file = data->proc_file;
	loff_t (*llseek)(struct file *, loff_t, int);
	loff_t ret;

	llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
	if(llseek != NULL){
		ret = (*llseek)(proc_file, off, where);
		if(ret < 0)
			return(ret);
	}

	return(default_llseek(file, off, where));
}

static const struct file_operations hppfs_file_fops = {
	.owner		= NULL,
	.llseek		= hppfs_llseek,
	.read		= hppfs_read,
	.write		= hppfs_write,
	.open		= hppfs_open,
};

struct hppfs_dirent {
	void *vfs_dirent;
	filldir_t filldir;
	struct dentry *dentry;
};

static int hppfs_filldir(void *d, const char *name, int size,
			 loff_t offset, u64 inode, unsigned int type)
{
	struct hppfs_dirent *dirent = d;

	if(file_removed(dirent->dentry, name))
		return(0);

	return((*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
				  inode, type));
}

static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
{
	struct hppfs_private *data = file->private_data;
	struct file *proc_file = data->proc_file;
	int (*readdir)(struct file *, void *, filldir_t);
	struct hppfs_dirent dirent = ((struct hppfs_dirent)
		                      { .vfs_dirent  	= ent,
					.filldir 	= filldir,
					.dentry  	= file->f_path.dentry } );
	int err;

	readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;

	proc_file->f_pos = file->f_pos;
	err = (*readdir)(proc_file, &dirent, hppfs_filldir);
	file->f_pos = proc_file->f_pos;

	return(err);
}

static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	return(0);
}

static const struct file_operations hppfs_dir_fops = {
	.owner		= NULL,
	.readdir	= hppfs_readdir,
	.open		= hppfs_dir_open,
	.fsync		= hppfs_fsync,
};

static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
{
	sf->f_blocks = 0;
	sf->f_bfree = 0;
	sf->f_bavail = 0;
	sf->f_files = 0;
	sf->f_ffree = 0;
	sf->f_type = HPPFS_SUPER_MAGIC;
	return(0);
}

static struct inode *hppfs_alloc_inode(struct super_block *sb)
{
	struct hppfs_inode_info *hi;

	hi = kmalloc(sizeof(*hi), GFP_KERNEL);
	if(hi == NULL)
		return(NULL);

	*hi = ((struct hppfs_inode_info) { .proc_dentry	= NULL });
	inode_init_once(&hi->vfs_inode);
	return(&hi->vfs_inode);
}

void hppfs_delete_inode(struct inode *ino)
{
	clear_inode(ino);
}

static void hppfs_destroy_inode(struct inode *inode)
{
	kfree(HPPFS_I(inode));
}

static const struct super_operations hppfs_sbops = {
	.alloc_inode	= hppfs_alloc_inode,
	.destroy_inode	= hppfs_destroy_inode,
	.delete_inode	= hppfs_delete_inode,
	.statfs		= hppfs_statfs,
};

static int hppfs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
	struct file *proc_file;
	struct dentry *proc_dentry;
	int ret;

	proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
	proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY);
	if (IS_ERR(proc_file))
		return PTR_ERR(proc_file);

	ret = proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, buflen);

	fput(proc_file);

	return ret;
}

static void* hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	struct file *proc_file;
	struct dentry *proc_dentry;
	void *ret;

	proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
	proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY);
	if (IS_ERR(proc_file))
		return proc_file;

	ret = proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);

	fput(proc_file);

	return ret;
}

static const struct inode_operations hppfs_dir_iops = {
	.lookup		= hppfs_lookup,
};

static const struct inode_operations hppfs_link_iops = {
	.readlink	= hppfs_readlink,
	.follow_link	= hppfs_follow_link,
};

static int init_inode(struct inode *inode, struct dentry *dentry)
{
	if(S_ISDIR(dentry->d_inode->i_mode)){
		inode->i_op = &hppfs_dir_iops;
		inode->i_fop = &hppfs_dir_fops;
	}
	else if(S_ISLNK(dentry->d_inode->i_mode)){
		inode->i_op = &hppfs_link_iops;
		inode->i_fop = &hppfs_file_fops;
	}
	else {
		inode->i_op = &hppfs_file_iops;
		inode->i_fop = &hppfs_file_fops;
	}

	HPPFS_I(inode)->proc_dentry = dentry;

	return(0);
}

static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
{
	struct inode *root_inode;
	struct file_system_type *procfs;
	struct super_block *proc_sb;
	int err;

	err = -ENOENT;
	procfs = get_fs_type("proc");
	if(procfs == NULL)
		goto out;

	if(list_empty(&procfs->fs_supers))
		goto out;

	proc_sb = list_entry(procfs->fs_supers.next, struct super_block,
			     s_instances);

	sb->s_blocksize = 1024;
	sb->s_blocksize_bits = 10;
	sb->s_magic = HPPFS_SUPER_MAGIC;
	sb->s_op = &hppfs_sbops;

	root_inode = hppfs_iget(sb);
	if (IS_ERR(root_inode)) {
		err = PTR_ERR(root_inode);
		goto out;
	}

	err = init_inode(root_inode, proc_sb->s_root);
	if(err)
		goto out_put;

	err = -ENOMEM;
	sb->s_root = d_alloc_root(root_inode);
	if(sb->s_root == NULL)
		goto out_put;

	hppfs_read_inode(root_inode);

	return(0);

 out_put:
	iput(root_inode);
 out:
	return(err);
}

static int hppfs_read_super(struct file_system_type *type,
			    int flags, const char *dev_name,
			    void *data, struct vfsmount *mnt)
{
	return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt);
}

static struct file_system_type hppfs_type = {
	.owner 		= THIS_MODULE,
	.name 		= "hppfs",
	.get_sb 	= hppfs_read_super,
	.kill_sb	= kill_anon_super,
	.fs_flags 	= 0,
};

static int __init init_hppfs(void)
{
	return(register_filesystem(&hppfs_type));
}

static void __exit exit_hppfs(void)
{
	unregister_filesystem(&hppfs_type);
}

module_init(init_hppfs)
module_exit(exit_hppfs)
MODULE_LICENSE("GPL");

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
	3	* Licensed under the GPL
	4	*/
	5
	6	#include <linux/fs.h>
3f580470	7	#include <linux/file.h>
1da177e4 LT	8	#include <linux/module.h>
	9	#include <linux/init.h>
	10	#include <linux/slab.h>
	11	#include <linux/list.h>
	12	#include <linux/kernel.h>
	13	#include <linux/ctype.h>
	14	#include <linux/dcache.h>
	15	#include <linux/statfs.h>
	16	#include <asm/uaccess.h>
	17	#include <asm/fcntl.h>
	18	#include "os.h"
	19
	20	static int init_inode(struct inode inode, struct dentry dentry);
	21
	22	struct hppfs_data {
	23	struct list_head list;
	24	char contents[PAGE_SIZE - sizeof(struct list_head)];
	25	};
	26
	27	struct hppfs_private {
	28	struct file *proc_file;
	29	int host_fd;
	30	loff_t len;
	31	struct hppfs_data *contents;
	32	};
	33
	34	struct hppfs_inode_info {
	35	struct dentry *proc_dentry;
	36	struct inode vfs_inode;
	37	};
	38
	39	static inline struct hppfs_inode_info HPPFS_I(struct inode inode)
	40	{
fd589e0b	41	return container_of(inode, struct hppfs_inode_info, vfs_inode);
1da177e4 LT	42	}
	43
	44	#define HPPFS_SUPER_MAGIC 0xb00000ee
	45
ee9b6d61	46	static const struct super_operations hppfs_sbops;
1da177e4 LT	47
	48	static int is_pid(struct dentry *dentry)
	49	{
	50	struct super_block *sb;
	51	int i;
	52
	53	sb = dentry->d_sb;
	54	if((sb->s_op != &hppfs_sbops) \|\| (dentry->d_parent != sb->s_root))
	55	return(0);
	56
	57	for(i = 0; i < dentry->d_name.len; i++){
	58	if(!isdigit(dentry->d_name.name[i]))
	59	return(0);
	60	}
	61	return(1);
	62	}
	63
	64	static char dentry_name(struct dentry dentry, int extra)
	65	{
	66	struct dentry *parent;
	67	char root, name;
	68	const char *seg_name;
	69	int len, seg_len;
	70
	71	len = 0;
	72	parent = dentry;
	73	while(parent->d_parent != parent){
	74	if(is_pid(parent))
	75	len += strlen("pid") + 1;
	76	else len += parent->d_name.len + 1;
	77	parent = parent->d_parent;
	78	}
	79
	80	root = "proc";
	81	len += strlen(root);
	82	name = kmalloc(len + extra + 1, GFP_KERNEL);
	83	if(name == NULL) return(NULL);
	84
	85	name[len] = '\0';
	86	parent = dentry;
	87	while(parent->d_parent != parent){
	88	if(is_pid(parent)){
	89	seg_name = "pid";
	90	seg_len = strlen("pid");
	91	}
	92	else {
	93	seg_name = parent->d_name.name;
	94	seg_len = parent->d_name.len;
	95	}
	96
	97	len -= seg_len + 1;
	98	name[len] = '/';
	99	strncpy(&name[len + 1], seg_name, seg_len);
	100	parent = parent->d_parent;
	101	}
	102	strncpy(name, root, strlen(root));
	103	return(name);
	104	}
	105
	106	struct dentry_operations hppfs_dentry_ops = {
	107	};
	108
	109	static int file_removed(struct dentry dentry, const char file)
	110	{
111	char *host_file;
112	int extra, fd;
113
114	extra = 0;
115	if(file != NULL) extra += strlen(file) + 1;
116
117	host_file = dentry_name(dentry, extra + strlen("/remove"));
118	if(host_file == NULL){
119	printk("file_removed : allocation failed\n");
120	return(-ENOMEM);
121	}
122
123	if(file != NULL){
124	strcat(host_file, "/");
125	strcat(host_file, file);
126	}
127	strcat(host_file, "/remove");
128
129	fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
130	kfree(host_file);
131	if(fd > 0){
132	os_close_file(fd);
133	return(1);
134	}
135	return(0);
136	}
137
138	static void hppfs_read_inode(struct inode *ino)
139	{
140	struct inode *proc_ino;
141
142	if(HPPFS_I(ino)->proc_dentry == NULL)
143	return;
144
145	proc_ino = HPPFS_I(ino)->proc_dentry->d_inode;
146	ino->i_uid = proc_ino->i_uid;
147	ino->i_gid = proc_ino->i_gid;
148	ino->i_atime = proc_ino->i_atime;
149	ino->i_mtime = proc_ino->i_mtime;
150	ino->i_ctime = proc_ino->i_ctime;
151	ino->i_ino = proc_ino->i_ino;
152	ino->i_mode = proc_ino->i_mode;
153	ino->i_nlink = proc_ino->i_nlink;
154	ino->i_size = proc_ino->i_size;
1da177e4 LT	155	ino->i_blocks = proc_ino->i_blocks;
	156	}
	157
755aedc1 DH	158	static struct inode hppfs_iget(struct super_block sb)
	159	{
	160	struct inode *inode;
	161
	162	inode = iget_locked(sb, 0);
	163	if (!inode)
	164	return ERR_PTR(-ENOMEM);
	165	if (inode->i_state & I_NEW) {
	166	hppfs_read_inode(inode);
	167	unlock_new_inode(inode);
	168	}
	169	return inode;
	170	}
	171
1da177e4 LT	172	static struct dentry hppfs_lookup(struct inode ino, struct dentry *dentry,
	173	struct nameidata *nd)
	174	{
	175	struct dentry proc_dentry, new, *parent;
	176	struct inode *inode;
	177	int err, deleted;
	178
	179	deleted = file_removed(dentry, NULL);
	180	if(deleted < 0)
	181	return(ERR_PTR(deleted));
	182	else if(deleted)
	183	return(ERR_PTR(-ENOENT));
	184
	185	err = -ENOMEM;
	186	parent = HPPFS_I(ino)->proc_dentry;
1b1dcc1b	187	mutex_lock(&parent->d_inode->i_mutex);
1da177e4 LT	188	proc_dentry = d_lookup(parent, &dentry->d_name);
	189	if(proc_dentry == NULL){
	190	proc_dentry = d_alloc(parent, &dentry->d_name);
	191	if(proc_dentry == NULL){
1b1dcc1b	192	mutex_unlock(&parent->d_inode->i_mutex);
1da177e4 LT	193	goto out;
	194	}
	195	new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
	196	proc_dentry, NULL);
	197	if(new){
	198	dput(proc_dentry);
	199	proc_dentry = new;
	200	}
	201	}
1b1dcc1b	202	mutex_unlock(&parent->d_inode->i_mutex);
1da177e4 LT	203
	204	if(IS_ERR(proc_dentry))
	205	return(proc_dentry);
	206
755aedc1 DH	207	inode = hppfs_iget(ino->i_sb);
	208	if (IS_ERR(inode)) {
	209	err = PTR_ERR(inode);
1da177e4	210	goto out_dput;
755aedc1	211	}
1da177e4 LT	212
	213	err = init_inode(inode, proc_dentry);
	214	if(err)
	215	goto out_put;
	216
	217	hppfs_read_inode(inode);
	218
	219	d_add(dentry, inode);
	220	dentry->d_op = &hppfs_dentry_ops;
	221	return(NULL);
	222
	223	out_put:
	224	iput(inode);
	225	out_dput:
	226	dput(proc_dentry);
	227	out:
	228	return(ERR_PTR(err));
	229	}
	230
92e1d5be	231	static const struct inode_operations hppfs_file_iops = {
1da177e4 LT	232	};
1da177e4 LT	233
347f217c	234	static ssize_t read_proc(struct file file, char __user buf, ssize_t count,
1da177e4 LT	235	loff_t *ppos, int is_user)
1da177e4 LT	236	{
347f217c	237	ssize_t (read)(struct file , char __user , size_t, loff_t );
1da177e4 LT	238	ssize_t n;
1da177e4 LT	239
471b17e7	240	read = file->f_path.dentry->d_inode->i_fop->read;
1da177e4 LT	241
	242	if(!is_user)
	243	set_fs(KERNEL_DS);
	244
	245	n = (*read)(file, buf, count, &file->f_pos);
	246
	247	if(!is_user)
	248	set_fs(USER_DS);
	249
	250	if(ppos) *ppos = file->f_pos;
8e0a2181	251	return n;
1da177e4 LT	252	}
1da177e4 LT	253
347f217c	254	static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
1da177e4 LT	255	{
	256	ssize_t n;
	257	int cur, err;
	258	char *new_buf;
	259
	260	n = -ENOMEM;
	261	new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	262	if(new_buf == NULL){
	263	printk("hppfs_read_file : kmalloc failed\n");
	264	goto out;
	265	}
	266	n = 0;
	267	while(count > 0){
	268	cur = min_t(ssize_t, count, PAGE_SIZE);
	269	err = os_read_file(fd, new_buf, cur);
	270	if(err < 0){
	271	printk("hppfs_read : read failed, errno = %d\n",
8e0a2181	272	err);
1da177e4 LT	273	n = err;
	274	goto out_free;
	275	}
	276	else if(err == 0)
	277	break;
	278
	279	if(copy_to_user(buf, new_buf, err)){
	280	n = -EFAULT;
	281	goto out_free;
	282	}
	283	n += err;
	284	count -= err;
	285	}
	286	out_free:
	287	kfree(new_buf);
	288	out:
8e0a2181	289	return n;
1da177e4 LT	290	}
1da177e4 LT	291
347f217c	292	static ssize_t hppfs_read(struct file file, char __user buf, size_t count,
1da177e4 LT	293	loff_t *ppos)
	294	{
	295	struct hppfs_private *hppfs = file->private_data;
	296	struct hppfs_data *data;
	297	loff_t off;
	298	int err;
	299
	300	if(hppfs->contents != NULL){
	301	if(*ppos >= hppfs->len) return(0);
	302
	303	data = hppfs->contents;
	304	off = *ppos;
	305	while(off >= sizeof(data->contents)){
	306	data = list_entry(data->list.next, struct hppfs_data,
	307	list);
	308	off -= sizeof(data->contents);
	309	}
	310
	311	if(off + count > hppfs->len)
	312	count = hppfs->len - off;
	313	copy_to_user(buf, &data->contents[off], count);
	314	*ppos += count;
	315	}
	316	else if(hppfs->host_fd != -1){
	317	err = os_seek_file(hppfs->host_fd, *ppos);
	318	if(err){
	319	printk("hppfs_read : seek failed, errno = %d\n", err);
	320	return(err);
	321	}
	322	count = hppfs_read_file(hppfs->host_fd, buf, count);
	323	if(count > 0)
	324	*ppos += count;
	325	}
	326	else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
	327
	328	return(count);
	329	}
	330
347f217c	331	static ssize_t hppfs_write(struct file file, const char __user buf, size_t len,
1da177e4 LT	332	loff_t *ppos)
	333	{
	334	struct hppfs_private *data = file->private_data;
	335	struct file *proc_file = data->proc_file;
347f217c	336	ssize_t (write)(struct file , const char __user , size_t, loff_t );
1da177e4 LT	337	int err;
1da177e4 LT	338
471b17e7	339	write = proc_file->f_path.dentry->d_inode->i_fop->write;
1da177e4 LT	340
	341	proc_file->f_pos = file->f_pos;
	342	err = (*write)(proc_file, buf, len, &proc_file->f_pos);
	343	file->f_pos = proc_file->f_pos;
	344
	345	return(err);
	346	}
	347
	348	static int open_host_sock(char host_file, int filter_out)
	349	{
	350	char *end;
	351	int fd;
	352
	353	end = &host_file[strlen(host_file)];
	354	strcpy(end, "/rw");
	355	*filter_out = 1;
	356	fd = os_connect_socket(host_file);
	357	if(fd > 0)
	358	return(fd);
	359
	360	strcpy(end, "/r");
	361	*filter_out = 0;
	362	fd = os_connect_socket(host_file);
	363	return(fd);
	364	}
	365
	366	static void free_contents(struct hppfs_data *head)
	367	{
	368	struct hppfs_data *data;
	369	struct list_head ele, next;
	370
	371	if(head == NULL) return;
	372
	373	list_for_each_safe(ele, next, &head->list){
	374	data = list_entry(ele, struct hppfs_data, list);
	375	kfree(data);
	376	}
	377	kfree(head);
	378	}
	379
	380	static struct hppfs_data *hppfs_get_data(int fd, int filter,
	381	struct file *proc_file,
	382	struct file *hppfs_file,
	383	loff_t *size_out)
	384	{
	385	struct hppfs_data data, new, *head;
	386	int n, err;
	387
	388	err = -ENOMEM;
	389	data = kmalloc(sizeof(*data), GFP_KERNEL);
	390	if(data == NULL){
	391	printk("hppfs_get_data : head allocation failed\n");
	392	goto failed;
	393	}
	394
	395	INIT_LIST_HEAD(&data->list);
	396
	397	head = data;
	398	*size_out = 0;
	399
	400	if(filter){
	401	while((n = read_proc(proc_file, data->contents,
	402	sizeof(data->contents), NULL, 0)) > 0)
	403	os_write_file(fd, data->contents, n);
404	err = os_shutdown_socket(fd, 0, 1);
405	if(err){
406	printk("hppfs_get_data : failed to shut down "
407	"socket\n");
408	goto failed_free;
409	}
410	}
411	while(1){
412	n = os_read_file(fd, data->contents, sizeof(data->contents));
413	if(n < 0){
414	err = n;
415	printk("hppfs_get_data : read failed, errno = %d\n",
416	err);
417	goto failed_free;
418	}
419	else if(n == 0)
420	break;
421
422	*size_out += n;
423
424	if(n < sizeof(data->contents))
425	break;
426
427	new = kmalloc(sizeof(*data), GFP_KERNEL);
428	if(new == 0){
429	printk("hppfs_get_data : data allocation failed\n");
430	err = -ENOMEM;
431	goto failed_free;
432	}
433
434	INIT_LIST_HEAD(&new->list);
435	list_add(&new->list, &data->list);
436	data = new;
437	}
438	return(head);
439
440	failed_free:
441	free_contents(head);
442	failed:
443	return(ERR_PTR(err));
444	}
445
446	static struct hppfs_private *hppfs_data(void)
447	{
448	struct hppfs_private *data;
449
450	data = kmalloc(sizeof(*data), GFP_KERNEL);
451	if(data == NULL)
452	return(data);
453
454	*data = ((struct hppfs_private ) { .host_fd = -1,
455	.len = -1,
456	.contents = NULL } );
457	return(data);
458	}
459
460	static int file_mode(int fmode)
461	{
462	if(fmode == (FMODE_READ \| FMODE_WRITE))
463	return(O_RDWR);
464	if(fmode == FMODE_READ)
465	return(O_RDONLY);
466	if(fmode == FMODE_WRITE)
467	return(O_WRONLY);
468	return(0);
469	}
470
471	static int hppfs_open(struct inode inode, struct file file)
472	{
473	struct hppfs_private *data;
474	struct dentry *proc_dentry;
475	char *host_file;
476	int err, fd, type, filter;
477
478	err = -ENOMEM;
479	data = hppfs_data();
480	if(data == NULL)
481	goto out;
482
471b17e7	483	host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
1da177e4 LT	484	if(host_file == NULL)
	485	goto out_free2;
	486
	487	proc_dentry = HPPFS_I(inode)->proc_dentry;
	488
	489	/* XXX This isn't closed anywhere */
	490	data->proc_file = dentry_open(dget(proc_dentry), NULL,
	491	file_mode(file->f_mode));
	492	err = PTR_ERR(data->proc_file);
	493	if(IS_ERR(data->proc_file))
	494	goto out_free1;
	495
	496	type = os_file_type(host_file);
	497	if(type == OS_TYPE_FILE){
	498	fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
	499	if(fd >= 0)
	500	data->host_fd = fd;
	501	else printk("hppfs_open : failed to open '%s', errno = %d\n",
	502	host_file, -fd);
	503
	504	data->contents = NULL;
	505	}
	506	else if(type == OS_TYPE_DIR){
	507	fd = open_host_sock(host_file, &filter);
	508	if(fd > 0){
	509	data->contents = hppfs_get_data(fd, filter,
3f580470	510	data->proc_file,
1da177e4 LT	511	file, &data->len);
	512	if(!IS_ERR(data->contents))
	513	data->host_fd = fd;
	514	}
	515	else printk("hppfs_open : failed to open a socket in "
	516	"'%s', errno = %d\n", host_file, -fd);
	517	}
	518	kfree(host_file);
	519
	520	file->private_data = data;
	521	return(0);
	522
	523	out_free1:
	524	kfree(host_file);
	525	out_free2:
	526	free_contents(data->contents);
	527	kfree(data);
	528	out:
	529	return(err);
	530	}
	531
	532	static int hppfs_dir_open(struct inode inode, struct file file)
	533	{
	534	struct hppfs_private *data;
	535	struct dentry *proc_dentry;
	536	int err;
	537
	538	err = -ENOMEM;
	539	data = hppfs_data();
	540	if(data == NULL)
	541	goto out;
	542
	543	proc_dentry = HPPFS_I(inode)->proc_dentry;
	544	data->proc_file = dentry_open(dget(proc_dentry), NULL,
	545	file_mode(file->f_mode));
	546	err = PTR_ERR(data->proc_file);
	547	if(IS_ERR(data->proc_file))
	548	goto out_free;
	549
	550	file->private_data = data;
	551	return(0);
	552
	553	out_free:
	554	kfree(data);
	555	out:
	556	return(err);
	557	}
	558
	559	static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
	560	{
	561	struct hppfs_private *data = file->private_data;
3f580470	562	struct file *proc_file = data->proc_file;
1da177e4 LT	563	loff_t (llseek)(struct file , loff_t, int);
	564	loff_t ret;
	565
471b17e7	566	llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
1da177e4 LT	567	if(llseek != NULL){
	568	ret = (*llseek)(proc_file, off, where);
	569	if(ret < 0)
	570	return(ret);
	571	}
	572
	573	return(default_llseek(file, off, where));
	574	}
	575
4b6f5d20	576	static const struct file_operations hppfs_file_fops = {
1da177e4 LT	577	.owner = NULL,
	578	.llseek = hppfs_llseek,
	579	.read = hppfs_read,
	580	.write = hppfs_write,
	581	.open = hppfs_open,
	582	};
	583
	584	struct hppfs_dirent {
	585	void *vfs_dirent;
	586	filldir_t filldir;
	587	struct dentry *dentry;
	588	};
	589
	590	static int hppfs_filldir(void d, const char name, int size,
c8adf94a	591	loff_t offset, u64 inode, unsigned int type)
1da177e4 LT	592	{
	593	struct hppfs_dirent *dirent = d;
	594
	595	if(file_removed(dirent->dentry, name))
	596	return(0);
	597
	598	return((*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
	599	inode, type));
	600	}
	601
	602	static int hppfs_readdir(struct file file, void ent, filldir_t filldir)
	603	{
	604	struct hppfs_private *data = file->private_data;
3f580470	605	struct file *proc_file = data->proc_file;
1da177e4 LT	606	int (readdir)(struct file , void *, filldir_t);
	607	struct hppfs_dirent dirent = ((struct hppfs_dirent)
	608	{ .vfs_dirent = ent,
	609	.filldir = filldir,
471b17e7	610	.dentry = file->f_path.dentry } );
1da177e4 LT	611	int err;
1da177e4 LT	612
471b17e7	613	readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;
1da177e4 LT	614
	615	proc_file->f_pos = file->f_pos;
	616	err = (*readdir)(proc_file, &dirent, hppfs_filldir);
	617	file->f_pos = proc_file->f_pos;
	618
	619	return(err);
	620	}
	621
	622	static int hppfs_fsync(struct file file, struct dentry dentry, int datasync)
	623	{
	624	return(0);
	625	}
	626
4b6f5d20	627	static const struct file_operations hppfs_dir_fops = {
1da177e4 LT	628	.owner = NULL,
	629	.readdir = hppfs_readdir,
	630	.open = hppfs_dir_open,
	631	.fsync = hppfs_fsync,
	632	};
	633
726c3342	634	static int hppfs_statfs(struct dentry dentry, struct kstatfs sf)
1da177e4 LT	635	{
	636	sf->f_blocks = 0;
	637	sf->f_bfree = 0;
	638	sf->f_bavail = 0;
	639	sf->f_files = 0;
	640	sf->f_ffree = 0;
	641	sf->f_type = HPPFS_SUPER_MAGIC;
	642	return(0);
	643	}
	644
	645	static struct inode hppfs_alloc_inode(struct super_block sb)
	646	{
	647	struct hppfs_inode_info *hi;
	648
	649	hi = kmalloc(sizeof(*hi), GFP_KERNEL);
	650	if(hi == NULL)
	651	return(NULL);
	652
	653	*hi = ((struct hppfs_inode_info) { .proc_dentry = NULL });
	654	inode_init_once(&hi->vfs_inode);
	655	return(&hi->vfs_inode);
	656	}
	657
	658	void hppfs_delete_inode(struct inode *ino)
	659	{
	660	clear_inode(ino);
	661	}
	662
	663	static void hppfs_destroy_inode(struct inode *inode)
	664	{
	665	kfree(HPPFS_I(inode));
	666	}
	667
ee9b6d61	668	static const struct super_operations hppfs_sbops = {
1da177e4 LT	669	.alloc_inode = hppfs_alloc_inode,
1da177e4 LT	670	.destroy_inode = hppfs_destroy_inode,
1da177e4 LT	671	.delete_inode = hppfs_delete_inode,
	672	.statfs = hppfs_statfs,
	673	};
	674
347f217c	675	static int hppfs_readlink(struct dentry dentry, char __user buffer, int buflen)
1da177e4 LT	676	{
	677	struct file *proc_file;
	678	struct dentry *proc_dentry;
fd589e0b	679	int ret;
1da177e4 LT	680
	681	proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
	682	proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY);
fd589e0b PBG	683	if (IS_ERR(proc_file))
fd589e0b PBG	684	return PTR_ERR(proc_file);
1da177e4	685
fd589e0b	686	ret = proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, buflen);
1da177e4 LT	687
	688	fput(proc_file);
	689
fd589e0b	690	return ret;
1da177e4 LT	691	}
1da177e4 LT	692
d7a60d50	693	static void* hppfs_follow_link(struct dentry dentry, struct nameidata nd)
1da177e4 LT	694	{
	695	struct file *proc_file;
	696	struct dentry *proc_dentry;
d7a60d50	697	void *ret;
1da177e4 LT	698
	699	proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
	700	proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY);
fd589e0b PBG	701	if (IS_ERR(proc_file))
fd589e0b PBG	702	return proc_file;
d7a60d50	703
fd589e0b	704	ret = proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
1da177e4 LT	705
	706	fput(proc_file);
	707
d7a60d50	708	return ret;
1da177e4 LT	709	}
1da177e4 LT	710
92e1d5be	711	static const struct inode_operations hppfs_dir_iops = {
1da177e4 LT	712	.lookup = hppfs_lookup,
	713	};
	714
92e1d5be	715	static const struct inode_operations hppfs_link_iops = {
1da177e4 LT	716	.readlink = hppfs_readlink,
	717	.follow_link = hppfs_follow_link,
	718	};
	719
	720	static int init_inode(struct inode inode, struct dentry dentry)
	721	{
	722	if(S_ISDIR(dentry->d_inode->i_mode)){
	723	inode->i_op = &hppfs_dir_iops;
	724	inode->i_fop = &hppfs_dir_fops;
	725	}
	726	else if(S_ISLNK(dentry->d_inode->i_mode)){
	727	inode->i_op = &hppfs_link_iops;
	728	inode->i_fop = &hppfs_file_fops;
	729	}
	730	else {
	731	inode->i_op = &hppfs_file_iops;
	732	inode->i_fop = &hppfs_file_fops;
	733	}
	734
	735	HPPFS_I(inode)->proc_dentry = dentry;
	736
	737	return(0);
	738	}
	739
	740	static int hppfs_fill_super(struct super_block sb, void d, int silent)
	741	{
	742	struct inode *root_inode;
	743	struct file_system_type *procfs;
	744	struct super_block *proc_sb;
	745	int err;
	746
	747	err = -ENOENT;
	748	procfs = get_fs_type("proc");
	749	if(procfs == NULL)
	750	goto out;
	751
	752	if(list_empty(&procfs->fs_supers))
	753	goto out;
	754
	755	proc_sb = list_entry(procfs->fs_supers.next, struct super_block,
	756	s_instances);
	757
	758	sb->s_blocksize = 1024;
	759	sb->s_blocksize_bits = 10;
	760	sb->s_magic = HPPFS_SUPER_MAGIC;
	761	sb->s_op = &hppfs_sbops;
	762
755aedc1 DH	763	root_inode = hppfs_iget(sb);
	764	if (IS_ERR(root_inode)) {
	765	err = PTR_ERR(root_inode);
1da177e4	766	goto out;
755aedc1	767	}
1da177e4 LT	768
	769	err = init_inode(root_inode, proc_sb->s_root);
	770	if(err)
	771	goto out_put;
	772
	773	err = -ENOMEM;
	774	sb->s_root = d_alloc_root(root_inode);
	775	if(sb->s_root == NULL)
	776	goto out_put;
	777
	778	hppfs_read_inode(root_inode);
	779
	780	return(0);
	781
	782	out_put:
	783	iput(root_inode);
	784	out:
	785	return(err);
	786	}
	787
454e2398 DH	788	static int hppfs_read_super(struct file_system_type *type,
	789	int flags, const char *dev_name,
	790	void data, struct vfsmount mnt)
1da177e4	791	{
454e2398	792	return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt);
1da177e4 LT	793	}
	794
	795	static struct file_system_type hppfs_type = {
	796	.owner = THIS_MODULE,
	797	.name = "hppfs",
	798	.get_sb = hppfs_read_super,
	799	.kill_sb = kill_anon_super,
	800	.fs_flags = 0,
	801	};
	802
	803	static int __init init_hppfs(void)
	804	{
	805	return(register_filesystem(&hppfs_type));
	806	}
	807
	808	static void __exit exit_hppfs(void)
	809	{
	810	unregister_filesystem(&hppfs_type);
	811	}
	812
	813	module_init(init_hppfs)
	814	module_exit(exit_hppfs)
	815	MODULE_LICENSE("GPL");
	816
	817	/*
	818	* Overrides for Emacs so that we follow Linus's tabbing style.
	819	* Emacs will notice this stuff at the end of the file and automatically
	820	* adjust the settings for this buffer only. This must remain at the end
	821	* of the file.
	822	* ---------------------------------------------------------------------------
	823	* Local variables:
	824	* c-file-style: "linux"
	825	* End:
	826	*/