--- /dev/null
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/fs.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(list_entry(inode, struct hppfs_inode_info, vfs_inode));
+}
+
+#define HPPFS_SUPER_MAGIC 0xb00000ee
+
+static 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_blksize = proc_ino->i_blksize;
+ ino->i_blocks = proc_ino->i_blocks;
+}
+
+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;
+ down(&parent->d_inode->i_sem);
+ proc_dentry = d_lookup(parent, &dentry->d_name);
+ if(proc_dentry == NULL){
+ proc_dentry = d_alloc(parent, &dentry->d_name);
+ if(proc_dentry == NULL){
+ up(&parent->d_inode->i_sem);
+ goto out;
+ }
+ new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
+ proc_dentry, NULL);
+ if(new){
+ dput(proc_dentry);
+ proc_dentry = new;
+ }
+ }
+ up(&parent->d_inode->i_sem);
+
+ if(IS_ERR(proc_dentry))
+ return(proc_dentry);
+
+ inode = iget(ino->i_sb, 0);
+ if(inode == NULL)
+ 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 struct inode_operations hppfs_file_iops = {
+};
+
+static ssize_t read_proc(struct file *file, char *buf, ssize_t count,
+ loff_t *ppos, int is_user)
+{
+ ssize_t (*read)(struct file *, char *, size_t, loff_t *);
+ ssize_t n;
+
+ read = file->f_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 *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",
+ count);
+ 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 *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 *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 *, size_t, loff_t *);
+ int err;
+
+ write = proc_file->f_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_dentry, strlen("/rw"));
+ if(host_file == NULL)
+ goto out_free2;
+
+ proc_dentry = HPPFS_I(inode)->proc_dentry;
+
+ /* XXX This isn't closed anywhere */
+ err = open_private_file(&data->proc_file, proc_dentry,
+ file_mode(file->f_mode));
+ if(err)
+ 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;
+ err = open_private_file(&data->proc_file, proc_dentry,
+ file_mode(file->f_mode));
+ if(err)
+ 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_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 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, ino_t 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_dentry } );
+ int err;
+
+ readdir = proc_file->f_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 struct file_operations hppfs_dir_fops = {
+ .owner = NULL,
+ .readdir = hppfs_readdir,
+ .open = hppfs_dir_open,
+ .fsync = hppfs_fsync,
+};
+
+static int hppfs_statfs(struct super_block *sb, 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 struct super_operations hppfs_sbops = {
+ .alloc_inode = hppfs_alloc_inode,
+ .destroy_inode = hppfs_destroy_inode,
+ .read_inode = hppfs_read_inode,
+ .delete_inode = hppfs_delete_inode,
+ .statfs = hppfs_statfs,
+};
+
+static int hppfs_readlink(struct dentry *dentry, char *buffer, int buflen)
+{
+ struct file proc_file;
+ struct dentry *proc_dentry;
+ int (*readlink)(struct dentry *, char *, int);
+ int err, n;
+
+ proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
+ err = open_private_file(&proc_file, proc_dentry, O_RDONLY);
+ if(err)
+ return(err);
+
+ readlink = proc_dentry->d_inode->i_op->readlink;
+ n = (*readlink)(proc_dentry, buffer, buflen);
+
+ close_private_file(&proc_file);
+
+ return(n);
+}
+
+static int hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct file proc_file;
+ struct dentry *proc_dentry;
+ int (*follow_link)(struct dentry *, struct nameidata *);
+ int err, n;
+
+ proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
+ err = open_private_file(&proc_file, proc_dentry, O_RDONLY);
+ if(err)
+ return(err);
+
+ follow_link = proc_dentry->d_inode->i_op->follow_link;
+ n = (*follow_link)(proc_dentry, nd);
+
+ close_private_file(&proc_file);
+
+ return(n);
+}
+
+static struct inode_operations hppfs_dir_iops = {
+ .lookup = hppfs_lookup,
+};
+
+static 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 = iget(sb, 0);
+ if(root_inode == NULL)
+ 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 struct super_block *hppfs_read_super(struct file_system_type *type,
+ int flags, const char *dev_name,
+ void *data)
+{
+ return(get_sb_nodev(type, flags, data, hppfs_fill_super));
+}
+
+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:
+ */
git://git.onelab.eu / linux-2.6.git / blobdiff