blob: 2b3d1828db99a2a68a3e5fef961f0f6740cf04c8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Hansen1dd0dd12008-02-15 18:37:00 -05002 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Licensed under the GPL
4 */
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/ctype.h>
7#include <linux/dcache.h>
Dave Hansen1dd0dd12008-02-15 18:37:00 -05008#include <linux/file.h>
9#include <linux/fs.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/list.h>
13#include <linux/module.h>
14#include <linux/mount.h>
15#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/statfs.h>
Dave Hansen1dd0dd12008-02-15 18:37:00 -050017#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include "os.h"
20
Al Virof382d6e2008-02-23 04:53:53 -050021static struct inode *get_inode(struct super_block *, struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23struct hppfs_data {
24 struct list_head list;
25 char contents[PAGE_SIZE - sizeof(struct list_head)];
26};
27
28struct hppfs_private {
29 struct file *proc_file;
30 int host_fd;
31 loff_t len;
32 struct hppfs_data *contents;
33};
34
35struct hppfs_inode_info {
Jeff Dikea0612b12008-05-12 14:01:49 -070036 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 struct inode vfs_inode;
38};
39
40static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
41{
Paolo 'Blaisorblade' Giarrussofd589e02005-08-26 16:57:53 +020042 return container_of(inode, struct hppfs_inode_info, vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043}
44
45#define HPPFS_SUPER_MAGIC 0xb00000ee
46
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080047static const struct super_operations hppfs_sbops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49static int is_pid(struct dentry *dentry)
50{
51 struct super_block *sb;
52 int i;
53
54 sb = dentry->d_sb;
Jeff Dikea0612b12008-05-12 14:01:49 -070055 if (dentry->d_parent != sb->s_root)
Dave Hansen1dd0dd12008-02-15 18:37:00 -050056 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Dave Hansen1dd0dd12008-02-15 18:37:00 -050058 for (i = 0; i < dentry->d_name.len; i++) {
59 if (!isdigit(dentry->d_name.name[i]))
60 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -050062 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063}
64
65static char *dentry_name(struct dentry *dentry, int extra)
66{
67 struct dentry *parent;
68 char *root, *name;
69 const char *seg_name;
70 int len, seg_len;
71
72 len = 0;
73 parent = dentry;
Dave Hansen1dd0dd12008-02-15 18:37:00 -050074 while (parent->d_parent != parent) {
75 if (is_pid(parent))
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 len += strlen("pid") + 1;
77 else len += parent->d_name.len + 1;
78 parent = parent->d_parent;
79 }
80
81 root = "proc";
82 len += strlen(root);
83 name = kmalloc(len + extra + 1, GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -050084 if (name == NULL)
85 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87 name[len] = '\0';
88 parent = dentry;
Dave Hansen1dd0dd12008-02-15 18:37:00 -050089 while (parent->d_parent != parent) {
90 if (is_pid(parent)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 seg_name = "pid";
92 seg_len = strlen("pid");
93 }
94 else {
95 seg_name = parent->d_name.name;
96 seg_len = parent->d_name.len;
97 }
98
99 len -= seg_len + 1;
100 name[len] = '/';
101 strncpy(&name[len + 1], seg_name, seg_len);
102 parent = parent->d_parent;
103 }
104 strncpy(name, root, strlen(root));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500105 return name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static int file_removed(struct dentry *dentry, const char *file)
109{
110 char *host_file;
111 int extra, fd;
112
113 extra = 0;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500114 if (file != NULL)
115 extra += strlen(file) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 host_file = dentry_name(dentry, extra + strlen("/remove"));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500118 if (host_file == NULL) {
119 printk(KERN_ERR "file_removed : allocation failed\n");
120 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500123 if (file != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 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);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500131 if (fd > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 os_close_file(fd);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500133 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500135 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
Jeff Dikea0612b12008-05-12 14:01:49 -0700139 struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
141 struct dentry *proc_dentry, *new, *parent;
142 struct inode *inode;
143 int err, deleted;
144
145 deleted = file_removed(dentry, NULL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500146 if (deleted < 0)
147 return ERR_PTR(deleted);
148 else if (deleted)
149 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 err = -ENOMEM;
152 parent = HPPFS_I(ino)->proc_dentry;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800153 mutex_lock(&parent->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 proc_dentry = d_lookup(parent, &dentry->d_name);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500155 if (proc_dentry == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 proc_dentry = d_alloc(parent, &dentry->d_name);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500157 if (proc_dentry == NULL) {
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800158 mutex_unlock(&parent->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 goto out;
160 }
161 new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
162 proc_dentry, NULL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500163 if (new) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 dput(proc_dentry);
165 proc_dentry = new;
166 }
167 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800168 mutex_unlock(&parent->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500170 if (IS_ERR(proc_dentry))
171 return proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Al Virof382d6e2008-02-23 04:53:53 -0500173 err = -ENOMEM;
174 inode = get_inode(ino->i_sb, proc_dentry);
175 if (!inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 goto out_dput;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 d_add(dentry, inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500179 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 out_dput:
182 dput(proc_dentry);
183 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500184 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800187static const struct inode_operations hppfs_file_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188};
189
Al Viro347f2172006-03-31 02:30:16 -0800190static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 loff_t *ppos, int is_user)
192{
Al Viro347f2172006-03-31 02:30:16 -0800193 ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 ssize_t n;
195
Josef Sipek471b17e2006-12-08 02:37:07 -0800196 read = file->f_path.dentry->d_inode->i_fop->read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500198 if (!is_user)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 set_fs(KERNEL_DS);
200
201 n = (*read)(file, buf, count, &file->f_pos);
202
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500203 if (!is_user)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 set_fs(USER_DS);
205
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500206 if (ppos)
207 *ppos = file->f_pos;
Paolo 'Blaisorblade' Giarrusso8e0a2182005-07-14 00:33:41 -0700208 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209}
210
Al Viro347f2172006-03-31 02:30:16 -0800211static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
213 ssize_t n;
214 int cur, err;
215 char *new_buf;
216
217 n = -ENOMEM;
218 new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500219 if (new_buf == NULL) {
220 printk(KERN_ERR "hppfs_read_file : kmalloc failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 goto out;
222 }
223 n = 0;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500224 while (count > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 cur = min_t(ssize_t, count, PAGE_SIZE);
226 err = os_read_file(fd, new_buf, cur);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500227 if (err < 0) {
228 printk(KERN_ERR "hppfs_read : read failed, "
229 "errno = %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 n = err;
231 goto out_free;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500232 } else if (err == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 break;
234
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500235 if (copy_to_user(buf, new_buf, err)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 n = -EFAULT;
237 goto out_free;
238 }
239 n += err;
240 count -= err;
241 }
242 out_free:
243 kfree(new_buf);
244 out:
Paolo 'Blaisorblade' Giarrusso8e0a2182005-07-14 00:33:41 -0700245 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
247
Al Viro347f2172006-03-31 02:30:16 -0800248static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 loff_t *ppos)
250{
251 struct hppfs_private *hppfs = file->private_data;
252 struct hppfs_data *data;
253 loff_t off;
254 int err;
255
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500256 if (hppfs->contents != NULL) {
Jeff Dikea0612b12008-05-12 14:01:49 -0700257 int rem;
258
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500259 if (*ppos >= hppfs->len)
260 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 data = hppfs->contents;
263 off = *ppos;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500264 while (off >= sizeof(data->contents)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 data = list_entry(data->list.next, struct hppfs_data,
266 list);
267 off -= sizeof(data->contents);
268 }
269
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500270 if (off + count > hppfs->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 count = hppfs->len - off;
Jeff Dikea0612b12008-05-12 14:01:49 -0700272 rem = copy_to_user(buf, &data->contents[off], count);
273 *ppos += count - rem;
274 if (rem > 0)
275 return -EFAULT;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500276 } else if (hppfs->host_fd != -1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 err = os_seek_file(hppfs->host_fd, *ppos);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500278 if (err) {
279 printk(KERN_ERR "hppfs_read : seek failed, "
280 "errno = %d\n", err);
281 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 }
283 count = hppfs_read_file(hppfs->host_fd, buf, count);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500284 if (count > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 *ppos += count;
286 }
287 else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
288
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500289 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
Jeff Dikea0612b12008-05-12 14:01:49 -0700292static ssize_t hppfs_write(struct file *file, const char __user *buf,
293 size_t len, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
295 struct hppfs_private *data = file->private_data;
296 struct file *proc_file = data->proc_file;
Al Viro347f2172006-03-31 02:30:16 -0800297 ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Josef Sipek471b17e2006-12-08 02:37:07 -0800299 write = proc_file->f_path.dentry->d_inode->i_fop->write;
Jeff Dikea0612b12008-05-12 14:01:49 -0700300 return (*write)(proc_file, buf, len, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
303static int open_host_sock(char *host_file, int *filter_out)
304{
305 char *end;
306 int fd;
307
308 end = &host_file[strlen(host_file)];
309 strcpy(end, "/rw");
310 *filter_out = 1;
311 fd = os_connect_socket(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500312 if (fd > 0)
313 return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 strcpy(end, "/r");
316 *filter_out = 0;
317 fd = os_connect_socket(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500318 return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
320
321static void free_contents(struct hppfs_data *head)
322{
323 struct hppfs_data *data;
324 struct list_head *ele, *next;
325
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500326 if (head == NULL)
327 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500329 list_for_each_safe(ele, next, &head->list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 data = list_entry(ele, struct hppfs_data, list);
331 kfree(data);
332 }
333 kfree(head);
334}
335
336static struct hppfs_data *hppfs_get_data(int fd, int filter,
337 struct file *proc_file,
338 struct file *hppfs_file,
339 loff_t *size_out)
340{
341 struct hppfs_data *data, *new, *head;
342 int n, err;
343
344 err = -ENOMEM;
345 data = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500346 if (data == NULL) {
347 printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 goto failed;
349 }
350
351 INIT_LIST_HEAD(&data->list);
352
353 head = data;
354 *size_out = 0;
355
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500356 if (filter) {
357 while ((n = read_proc(proc_file, data->contents,
Jeff Dikea0612b12008-05-12 14:01:49 -0700358 sizeof(data->contents), NULL, 0)) > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 os_write_file(fd, data->contents, n);
360 err = os_shutdown_socket(fd, 0, 1);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500361 if (err) {
362 printk(KERN_ERR "hppfs_get_data : failed to shut down "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 "socket\n");
364 goto failed_free;
365 }
366 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500367 while (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 n = os_read_file(fd, data->contents, sizeof(data->contents));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500369 if (n < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 err = n;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500371 printk(KERN_ERR "hppfs_get_data : read failed, "
372 "errno = %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 goto failed_free;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500374 } else if (n == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 break;
376
377 *size_out += n;
378
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500379 if (n < sizeof(data->contents))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 break;
381
382 new = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500383 if (new == 0) {
384 printk(KERN_ERR "hppfs_get_data : data allocation "
385 "failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 err = -ENOMEM;
387 goto failed_free;
388 }
389
390 INIT_LIST_HEAD(&new->list);
391 list_add(&new->list, &data->list);
392 data = new;
393 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500394 return head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 failed_free:
397 free_contents(head);
398 failed:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500399 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
402static struct hppfs_private *hppfs_data(void)
403{
404 struct hppfs_private *data;
405
406 data = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500407 if (data == NULL)
408 return data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410 *data = ((struct hppfs_private ) { .host_fd = -1,
411 .len = -1,
412 .contents = NULL } );
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500413 return data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414}
415
416static int file_mode(int fmode)
417{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500418 if (fmode == (FMODE_READ | FMODE_WRITE))
419 return O_RDWR;
420 if (fmode == FMODE_READ)
421 return O_RDONLY;
422 if (fmode == FMODE_WRITE)
423 return O_WRONLY;
424 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
426
427static int hppfs_open(struct inode *inode, struct file *file)
428{
429 struct hppfs_private *data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500430 struct vfsmount *proc_mnt;
Jeff Dikea0612b12008-05-12 14:01:49 -0700431 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 char *host_file;
433 int err, fd, type, filter;
434
435 err = -ENOMEM;
436 data = hppfs_data();
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500437 if (data == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 goto out;
439
Josef Sipek471b17e2006-12-08 02:37:07 -0800440 host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500441 if (host_file == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 goto out_free2;
443
444 proc_dentry = HPPFS_I(inode)->proc_dentry;
Al Virof382d6e2008-02-23 04:53:53 -0500445 proc_mnt = inode->i_sb->s_fs_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447 /* XXX This isn't closed anywhere */
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500448 data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 file_mode(file->f_mode));
450 err = PTR_ERR(data->proc_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500451 if (IS_ERR(data->proc_file))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 goto out_free1;
453
454 type = os_file_type(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500455 if (type == OS_TYPE_FILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500457 if (fd >= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 data->host_fd = fd;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500459 else
460 printk(KERN_ERR "hppfs_open : failed to open '%s', "
461 "errno = %d\n", host_file, -fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463 data->contents = NULL;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500464 } else if (type == OS_TYPE_DIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 fd = open_host_sock(host_file, &filter);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500466 if (fd > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 data->contents = hppfs_get_data(fd, filter,
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700468 data->proc_file,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 file, &data->len);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500470 if (!IS_ERR(data->contents))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 data->host_fd = fd;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500472 } else
473 printk(KERN_ERR "hppfs_open : failed to open a socket "
474 "in '%s', errno = %d\n", host_file, -fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 }
476 kfree(host_file);
477
478 file->private_data = data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500479 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 out_free1:
482 kfree(host_file);
483 out_free2:
484 free_contents(data->contents);
485 kfree(data);
486 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500487 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
489
490static int hppfs_dir_open(struct inode *inode, struct file *file)
491{
492 struct hppfs_private *data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500493 struct vfsmount *proc_mnt;
Jeff Dikea0612b12008-05-12 14:01:49 -0700494 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 int err;
496
497 err = -ENOMEM;
498 data = hppfs_data();
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500499 if (data == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 goto out;
501
502 proc_dentry = HPPFS_I(inode)->proc_dentry;
Al Virof382d6e2008-02-23 04:53:53 -0500503 proc_mnt = inode->i_sb->s_fs_info;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500504 data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 file_mode(file->f_mode));
506 err = PTR_ERR(data->proc_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500507 if (IS_ERR(data->proc_file))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 goto out_free;
509
510 file->private_data = data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500511 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 out_free:
514 kfree(data);
515 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500516 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
519static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
520{
521 struct hppfs_private *data = file->private_data;
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700522 struct file *proc_file = data->proc_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 loff_t (*llseek)(struct file *, loff_t, int);
524 loff_t ret;
525
Josef Sipek471b17e2006-12-08 02:37:07 -0800526 llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500527 if (llseek != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 ret = (*llseek)(proc_file, off, where);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500529 if (ret < 0)
530 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 }
532
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500533 return default_llseek(file, off, where);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534}
535
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800536static const struct file_operations hppfs_file_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 .owner = NULL,
538 .llseek = hppfs_llseek,
539 .read = hppfs_read,
540 .write = hppfs_write,
541 .open = hppfs_open,
542};
543
544struct hppfs_dirent {
545 void *vfs_dirent;
546 filldir_t filldir;
547 struct dentry *dentry;
548};
549
550static int hppfs_filldir(void *d, const char *name, int size,
Al Viroc8adf942006-10-09 20:26:58 +0100551 loff_t offset, u64 inode, unsigned int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
553 struct hppfs_dirent *dirent = d;
554
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500555 if (file_removed(dirent->dentry, name))
556 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500558 return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
559 inode, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
562static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
563{
564 struct hppfs_private *data = file->private_data;
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700565 struct file *proc_file = data->proc_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 int (*readdir)(struct file *, void *, filldir_t);
567 struct hppfs_dirent dirent = ((struct hppfs_dirent)
568 { .vfs_dirent = ent,
569 .filldir = filldir,
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500570 .dentry = file->f_path.dentry
571 });
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 int err;
573
Josef Sipek471b17e2006-12-08 02:37:07 -0800574 readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
576 proc_file->f_pos = file->f_pos;
577 err = (*readdir)(proc_file, &dirent, hppfs_filldir);
578 file->f_pos = proc_file->f_pos;
579
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500580 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581}
582
583static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync)
584{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500585 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586}
587
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800588static const struct file_operations hppfs_dir_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 .owner = NULL,
590 .readdir = hppfs_readdir,
591 .open = hppfs_dir_open,
592 .fsync = hppfs_fsync,
593};
594
David Howells726c3342006-06-23 02:02:58 -0700595static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
597 sf->f_blocks = 0;
598 sf->f_bfree = 0;
599 sf->f_bavail = 0;
600 sf->f_files = 0;
601 sf->f_ffree = 0;
602 sf->f_type = HPPFS_SUPER_MAGIC;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500603 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604}
605
606static struct inode *hppfs_alloc_inode(struct super_block *sb)
607{
608 struct hppfs_inode_info *hi;
609
610 hi = kmalloc(sizeof(*hi), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500611 if (!hi)
612 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500614 hi->proc_dentry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 inode_init_once(&hi->vfs_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500616 return &hi->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617}
618
619void hppfs_delete_inode(struct inode *ino)
620{
Jeff Dikea0612b12008-05-12 14:01:49 -0700621 dput(HPPFS_I(ino)->proc_dentry);
622 mntput(ino->i_sb->s_fs_info);
623
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 clear_inode(ino);
625}
626
627static void hppfs_destroy_inode(struct inode *inode)
628{
629 kfree(HPPFS_I(inode));
630}
631
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800632static const struct super_operations hppfs_sbops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 .alloc_inode = hppfs_alloc_inode,
634 .destroy_inode = hppfs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 .delete_inode = hppfs_delete_inode,
636 .statfs = hppfs_statfs,
637};
638
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500639static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
640 int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
644 proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
Jeff Dikea0612b12008-05-12 14:01:49 -0700645 return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
646 buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647}
648
Jeff Dikea0612b12008-05-12 14:01:49 -0700649static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653 proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500654
Jeff Dikea0612b12008-05-12 14:01:49 -0700655 return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
656}
Paolo 'Blaisorblade' Giarrussod7a60d52005-08-26 16:57:44 +0200657
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800658static const struct inode_operations hppfs_dir_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 .lookup = hppfs_lookup,
660};
661
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800662static const struct inode_operations hppfs_link_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 .readlink = hppfs_readlink,
664 .follow_link = hppfs_follow_link,
665};
666
Al Virof382d6e2008-02-23 04:53:53 -0500667static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668{
Al Virof382d6e2008-02-23 04:53:53 -0500669 struct inode *proc_ino = dentry->d_inode;
670 struct inode *inode = new_inode(sb);
671
672 if (!inode)
673 return ERR_PTR(-ENOMEM);
674
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500675 if (S_ISDIR(dentry->d_inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 inode->i_op = &hppfs_dir_iops;
677 inode->i_fop = &hppfs_dir_fops;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500678 } else if (S_ISLNK(dentry->d_inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 inode->i_op = &hppfs_link_iops;
680 inode->i_fop = &hppfs_file_fops;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500681 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 inode->i_op = &hppfs_file_iops;
683 inode->i_fop = &hppfs_file_fops;
684 }
685
Jeff Dikea0612b12008-05-12 14:01:49 -0700686 HPPFS_I(inode)->proc_dentry = dget(dentry);
Al Virof382d6e2008-02-23 04:53:53 -0500687
688 inode->i_uid = proc_ino->i_uid;
689 inode->i_gid = proc_ino->i_gid;
690 inode->i_atime = proc_ino->i_atime;
691 inode->i_mtime = proc_ino->i_mtime;
692 inode->i_ctime = proc_ino->i_ctime;
693 inode->i_ino = proc_ino->i_ino;
694 inode->i_mode = proc_ino->i_mode;
695 inode->i_nlink = proc_ino->i_nlink;
696 inode->i_size = proc_ino->i_size;
697 inode->i_blocks = proc_ino->i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Jeff Dikea0612b12008-05-12 14:01:49 -0700699 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700}
701
702static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
703{
704 struct inode *root_inode;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500705 struct vfsmount *proc_mnt;
Al Virof382d6e2008-02-23 04:53:53 -0500706 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Al Virof382d6e2008-02-23 04:53:53 -0500708 proc_mnt = do_kern_mount("proc", 0, "proc", NULL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500709 if (IS_ERR(proc_mnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 goto out;
711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 sb->s_blocksize = 1024;
713 sb->s_blocksize_bits = 10;
714 sb->s_magic = HPPFS_SUPER_MAGIC;
715 sb->s_op = &hppfs_sbops;
Al Virof382d6e2008-02-23 04:53:53 -0500716 sb->s_fs_info = proc_mnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 err = -ENOMEM;
Al Virof382d6e2008-02-23 04:53:53 -0500719 root_inode = get_inode(sb, proc_mnt->mnt_sb->s_root);
720 if (!root_inode)
721 goto out_mntput;
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 sb->s_root = d_alloc_root(root_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500724 if (!sb->s_root)
725 goto out_iput;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500727 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500729 out_iput:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 iput(root_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500731 out_mntput:
732 mntput(proc_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 out:
734 return(err);
735}
736
David Howells454e2392006-06-23 02:02:57 -0700737static int hppfs_read_super(struct file_system_type *type,
738 int flags, const char *dev_name,
739 void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740{
David Howells454e2392006-06-23 02:02:57 -0700741 return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742}
743
744static struct file_system_type hppfs_type = {
745 .owner = THIS_MODULE,
746 .name = "hppfs",
747 .get_sb = hppfs_read_super,
748 .kill_sb = kill_anon_super,
749 .fs_flags = 0,
750};
751
752static int __init init_hppfs(void)
753{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500754 return register_filesystem(&hppfs_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755}
756
757static void __exit exit_hppfs(void)
758{
759 unregister_filesystem(&hppfs_type);
760}
761
762module_init(init_hppfs)
763module_exit(exit_hppfs)
764MODULE_LICENSE("GPL");