2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/list.h>
11 #include <linux/kernel.h>
12 #include <linux/ctype.h>
13 #include <linux/dcache.h>
14 #include <linux/statfs.h>
15 #include <asm/uaccess.h>
16 #include <asm/fcntl.h>
19 static int init_inode(struct inode *inode, struct dentry *dentry);
22 struct list_head list;
23 char contents[PAGE_SIZE - sizeof(struct list_head)];
26 struct hppfs_private {
27 struct file proc_file;
30 struct hppfs_data *contents;
33 struct hppfs_inode_info {
34 struct dentry *proc_dentry;
35 struct inode vfs_inode;
38 static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
40 return(list_entry(inode, struct hppfs_inode_info, vfs_inode));
43 #define HPPFS_SUPER_MAGIC 0xb00000ee
45 static struct super_operations hppfs_sbops;
47 static int is_pid(struct dentry *dentry)
49 struct super_block *sb;
53 if((sb->s_op != &hppfs_sbops) || (dentry->d_parent != sb->s_root))
56 for(i = 0; i < dentry->d_name.len; i++){
57 if(!isdigit(dentry->d_name.name[i]))
63 static char *dentry_name(struct dentry *dentry, int extra)
65 struct dentry *parent;
72 while(parent->d_parent != parent){
74 len += strlen("pid") + 1;
75 else len += parent->d_name.len + 1;
76 parent = parent->d_parent;
81 name = kmalloc(len + extra + 1, GFP_KERNEL);
82 if(name == NULL) return(NULL);
86 while(parent->d_parent != parent){
89 seg_len = strlen("pid");
92 seg_name = parent->d_name.name;
93 seg_len = parent->d_name.len;
98 strncpy(&name[len + 1], seg_name, seg_len);
99 parent = parent->d_parent;
101 strncpy(name, root, strlen(root));
105 struct dentry_operations hppfs_dentry_ops = {
108 static int file_removed(struct dentry *dentry, const char *file)
114 if(file != NULL) extra += strlen(file) + 1;
116 host_file = dentry_name(dentry, extra + strlen("/remove"));
117 if(host_file == NULL){
118 printk("file_removed : allocation failed\n");
123 strcat(host_file, "/");
124 strcat(host_file, file);
126 strcat(host_file, "/remove");
128 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
137 static void hppfs_read_inode(struct inode *ino)
139 struct inode *proc_ino;
141 if(HPPFS_I(ino)->proc_dentry == NULL)
144 proc_ino = HPPFS_I(ino)->proc_dentry->d_inode;
145 ino->i_uid = proc_ino->i_uid;
146 ino->i_gid = proc_ino->i_gid;
147 ino->i_atime = proc_ino->i_atime;
148 ino->i_mtime = proc_ino->i_mtime;
149 ino->i_ctime = proc_ino->i_ctime;
150 ino->i_ino = proc_ino->i_ino;
151 ino->i_mode = proc_ino->i_mode;
152 ino->i_nlink = proc_ino->i_nlink;
153 ino->i_size = proc_ino->i_size;
154 ino->i_blksize = proc_ino->i_blksize;
155 ino->i_blocks = proc_ino->i_blocks;
158 static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
159 struct nameidata *nd)
161 struct dentry *proc_dentry, *new, *parent;
165 deleted = file_removed(dentry, NULL);
167 return(ERR_PTR(deleted));
169 return(ERR_PTR(-ENOENT));
172 parent = HPPFS_I(ino)->proc_dentry;
173 down(&parent->d_inode->i_sem);
174 proc_dentry = d_lookup(parent, &dentry->d_name);
175 if(proc_dentry == NULL){
176 proc_dentry = d_alloc(parent, &dentry->d_name);
177 if(proc_dentry == NULL){
178 up(&parent->d_inode->i_sem);
181 new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
188 up(&parent->d_inode->i_sem);
190 if(IS_ERR(proc_dentry))
193 inode = iget(ino->i_sb, 0);
197 err = init_inode(inode, proc_dentry);
201 hppfs_read_inode(inode);
203 d_add(dentry, inode);
204 dentry->d_op = &hppfs_dentry_ops;
212 return(ERR_PTR(err));
215 static struct inode_operations hppfs_file_iops = {
218 static ssize_t read_proc(struct file *file, char *buf, ssize_t count,
219 loff_t *ppos, int is_user)
221 ssize_t (*read)(struct file *, char *, size_t, loff_t *);
224 read = file->f_dentry->d_inode->i_fop->read;
229 n = (*read)(file, buf, count, &file->f_pos);
234 if(ppos) *ppos = file->f_pos;
238 static ssize_t hppfs_read_file(int fd, char *buf, ssize_t count)
245 new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
247 printk("hppfs_read_file : kmalloc failed\n");
252 cur = min_t(ssize_t, count, PAGE_SIZE);
253 err = os_read_file(fd, new_buf, cur);
255 printk("hppfs_read : read failed, errno = %d\n",
263 if(copy_to_user(buf, new_buf, err)){
276 static ssize_t hppfs_read(struct file *file, char *buf, size_t count,
279 struct hppfs_private *hppfs = file->private_data;
280 struct hppfs_data *data;
284 if(hppfs->contents != NULL){
285 if(*ppos >= hppfs->len) return(0);
287 data = hppfs->contents;
289 while(off >= sizeof(data->contents)){
290 data = list_entry(data->list.next, struct hppfs_data,
292 off -= sizeof(data->contents);
295 if(off + count > hppfs->len)
296 count = hppfs->len - off;
297 copy_to_user(buf, &data->contents[off], count);
300 else if(hppfs->host_fd != -1){
301 err = os_seek_file(hppfs->host_fd, *ppos);
303 printk("hppfs_read : seek failed, errno = %d\n", err);
306 count = hppfs_read_file(hppfs->host_fd, buf, count);
310 else count = read_proc(&hppfs->proc_file, buf, count, ppos, 1);
315 static ssize_t hppfs_write(struct file *file, const char *buf, size_t len,
318 struct hppfs_private *data = file->private_data;
319 struct file *proc_file = &data->proc_file;
320 ssize_t (*write)(struct file *, const char *, size_t, loff_t *);
323 write = proc_file->f_dentry->d_inode->i_fop->write;
325 proc_file->f_pos = file->f_pos;
326 err = (*write)(proc_file, buf, len, &proc_file->f_pos);
327 file->f_pos = proc_file->f_pos;
332 static int open_host_sock(char *host_file, int *filter_out)
337 end = &host_file[strlen(host_file)];
340 fd = os_connect_socket(host_file);
346 fd = os_connect_socket(host_file);
350 static void free_contents(struct hppfs_data *head)
352 struct hppfs_data *data;
353 struct list_head *ele, *next;
355 if(head == NULL) return;
357 list_for_each_safe(ele, next, &head->list){
358 data = list_entry(ele, struct hppfs_data, list);
364 static struct hppfs_data *hppfs_get_data(int fd, int filter,
365 struct file *proc_file,
366 struct file *hppfs_file,
369 struct hppfs_data *data, *new, *head;
373 data = kmalloc(sizeof(*data), GFP_KERNEL);
375 printk("hppfs_get_data : head allocation failed\n");
379 INIT_LIST_HEAD(&data->list);
385 while((n = read_proc(proc_file, data->contents,
386 sizeof(data->contents), NULL, 0)) > 0)
387 os_write_file(fd, data->contents, n);
388 err = os_shutdown_socket(fd, 0, 1);
390 printk("hppfs_get_data : failed to shut down "
396 n = os_read_file(fd, data->contents, sizeof(data->contents));
399 printk("hppfs_get_data : read failed, errno = %d\n",
408 if(n < sizeof(data->contents))
411 new = kmalloc(sizeof(*data), GFP_KERNEL);
413 printk("hppfs_get_data : data allocation failed\n");
418 INIT_LIST_HEAD(&new->list);
419 list_add(&new->list, &data->list);
427 return(ERR_PTR(err));
430 static struct hppfs_private *hppfs_data(void)
432 struct hppfs_private *data;
434 data = kmalloc(sizeof(*data), GFP_KERNEL);
438 *data = ((struct hppfs_private ) { .host_fd = -1,
440 .contents = NULL } );
444 static int file_mode(int fmode)
446 if(fmode == (FMODE_READ | FMODE_WRITE))
448 if(fmode == FMODE_READ)
450 if(fmode == FMODE_WRITE)
455 static int hppfs_open(struct inode *inode, struct file *file)
457 struct hppfs_private *data;
458 struct dentry *proc_dentry;
460 int err, fd, type, filter;
467 host_file = dentry_name(file->f_dentry, strlen("/rw"));
468 if(host_file == NULL)
471 proc_dentry = HPPFS_I(inode)->proc_dentry;
473 /* XXX This isn't closed anywhere */
474 err = open_private_file(&data->proc_file, proc_dentry,
475 file_mode(file->f_mode));
479 type = os_file_type(host_file);
480 if(type == OS_TYPE_FILE){
481 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
484 else printk("hppfs_open : failed to open '%s', errno = %d\n",
487 data->contents = NULL;
489 else if(type == OS_TYPE_DIR){
490 fd = open_host_sock(host_file, &filter);
492 data->contents = hppfs_get_data(fd, filter,
495 if(!IS_ERR(data->contents))
498 else printk("hppfs_open : failed to open a socket in "
499 "'%s', errno = %d\n", host_file, -fd);
503 file->private_data = data;
509 free_contents(data->contents);
515 static int hppfs_dir_open(struct inode *inode, struct file *file)
517 struct hppfs_private *data;
518 struct dentry *proc_dentry;
526 proc_dentry = HPPFS_I(inode)->proc_dentry;
527 err = open_private_file(&data->proc_file, proc_dentry,
528 file_mode(file->f_mode));
532 file->private_data = data;
541 static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
543 struct hppfs_private *data = file->private_data;
544 struct file *proc_file = &data->proc_file;
545 loff_t (*llseek)(struct file *, loff_t, int);
548 llseek = proc_file->f_dentry->d_inode->i_fop->llseek;
550 ret = (*llseek)(proc_file, off, where);
555 return(default_llseek(file, off, where));
558 static struct file_operations hppfs_file_fops = {
560 .llseek = hppfs_llseek,
562 .write = hppfs_write,
566 struct hppfs_dirent {
569 struct dentry *dentry;
572 static int hppfs_filldir(void *d, const char *name, int size,
573 loff_t offset, ino_t inode, unsigned int type)
575 struct hppfs_dirent *dirent = d;
577 if(file_removed(dirent->dentry, name))
580 return((*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
584 static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
586 struct hppfs_private *data = file->private_data;
587 struct file *proc_file = &data->proc_file;
588 int (*readdir)(struct file *, void *, filldir_t);
589 struct hppfs_dirent dirent = ((struct hppfs_dirent)
592 .dentry = file->f_dentry } );
595 readdir = proc_file->f_dentry->d_inode->i_fop->readdir;
597 proc_file->f_pos = file->f_pos;
598 err = (*readdir)(proc_file, &dirent, hppfs_filldir);
599 file->f_pos = proc_file->f_pos;
604 static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync)
609 static struct file_operations hppfs_dir_fops = {
611 .readdir = hppfs_readdir,
612 .open = hppfs_dir_open,
613 .fsync = hppfs_fsync,
616 static int hppfs_statfs(struct super_block *sb, struct kstatfs *sf)
623 sf->f_type = HPPFS_SUPER_MAGIC;
627 static struct inode *hppfs_alloc_inode(struct super_block *sb)
629 struct hppfs_inode_info *hi;
631 hi = kmalloc(sizeof(*hi), GFP_KERNEL);
635 *hi = ((struct hppfs_inode_info) { .proc_dentry = NULL });
636 inode_init_once(&hi->vfs_inode);
637 return(&hi->vfs_inode);
640 void hppfs_delete_inode(struct inode *ino)
645 static void hppfs_destroy_inode(struct inode *inode)
647 kfree(HPPFS_I(inode));
650 static struct super_operations hppfs_sbops = {
651 .alloc_inode = hppfs_alloc_inode,
652 .destroy_inode = hppfs_destroy_inode,
653 .read_inode = hppfs_read_inode,
654 .delete_inode = hppfs_delete_inode,
655 .statfs = hppfs_statfs,
658 static int hppfs_readlink(struct dentry *dentry, char *buffer, int buflen)
660 struct file proc_file;
661 struct dentry *proc_dentry;
662 int (*readlink)(struct dentry *, char *, int);
665 proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
666 err = open_private_file(&proc_file, proc_dentry, O_RDONLY);
670 readlink = proc_dentry->d_inode->i_op->readlink;
671 n = (*readlink)(proc_dentry, buffer, buflen);
673 close_private_file(&proc_file);
678 static int hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
680 struct file proc_file;
681 struct dentry *proc_dentry;
682 int (*follow_link)(struct dentry *, struct nameidata *);
685 proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
686 err = open_private_file(&proc_file, proc_dentry, O_RDONLY);
690 follow_link = proc_dentry->d_inode->i_op->follow_link;
691 n = (*follow_link)(proc_dentry, nd);
693 close_private_file(&proc_file);
698 static struct inode_operations hppfs_dir_iops = {
699 .lookup = hppfs_lookup,
702 static struct inode_operations hppfs_link_iops = {
703 .readlink = hppfs_readlink,
704 .follow_link = hppfs_follow_link,
707 static int init_inode(struct inode *inode, struct dentry *dentry)
709 if(S_ISDIR(dentry->d_inode->i_mode)){
710 inode->i_op = &hppfs_dir_iops;
711 inode->i_fop = &hppfs_dir_fops;
713 else if(S_ISLNK(dentry->d_inode->i_mode)){
714 inode->i_op = &hppfs_link_iops;
715 inode->i_fop = &hppfs_file_fops;
718 inode->i_op = &hppfs_file_iops;
719 inode->i_fop = &hppfs_file_fops;
722 HPPFS_I(inode)->proc_dentry = dentry;
727 static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
729 struct inode *root_inode;
730 struct file_system_type *procfs;
731 struct super_block *proc_sb;
735 procfs = get_fs_type("proc");
739 if(list_empty(&procfs->fs_supers))
742 proc_sb = list_entry(procfs->fs_supers.next, struct super_block,
745 sb->s_blocksize = 1024;
746 sb->s_blocksize_bits = 10;
747 sb->s_magic = HPPFS_SUPER_MAGIC;
748 sb->s_op = &hppfs_sbops;
750 root_inode = iget(sb, 0);
751 if(root_inode == NULL)
754 err = init_inode(root_inode, proc_sb->s_root);
759 sb->s_root = d_alloc_root(root_inode);
760 if(sb->s_root == NULL)
763 hppfs_read_inode(root_inode);
773 static struct super_block *hppfs_read_super(struct file_system_type *type,
774 int flags, const char *dev_name,
777 return(get_sb_nodev(type, flags, data, hppfs_fill_super));
780 static struct file_system_type hppfs_type = {
781 .owner = THIS_MODULE,
783 .get_sb = hppfs_read_super,
784 .kill_sb = kill_anon_super,
788 static int __init init_hppfs(void)
790 return(register_filesystem(&hppfs_type));
793 static void __exit exit_hppfs(void)
795 unregister_filesystem(&hppfs_type);
798 module_init(init_hppfs)
799 module_exit(exit_hppfs)
800 MODULE_LICENSE("GPL");
803 * Overrides for Emacs so that we follow Linus's tabbing style.
804 * Emacs will notice this stuff at the end of the file and automatically
805 * adjust the settings for this buffer only. This must remain at the end
807 * ---------------------------------------------------------------------------
809 * c-file-style: "linux"