blob: 7239efc690d833cf9e4a507916a5819270c1f267 [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 }
Roel Kluin880fe762009-04-02 16:57:18 -0700283 err = hppfs_read_file(hppfs->host_fd, buf, count);
284 if (err < 0) {
285 printk(KERN_ERR "hppfs_read: read failed: %d\n", err);
286 return err;
287 }
288 count = err;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500289 if (count > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 *ppos += count;
291 }
292 else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
293
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500294 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
Jeff Dikea0612b12008-05-12 14:01:49 -0700297static ssize_t hppfs_write(struct file *file, const char __user *buf,
298 size_t len, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 struct hppfs_private *data = file->private_data;
301 struct file *proc_file = data->proc_file;
Al Viro347f2172006-03-31 02:30:16 -0800302 ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Josef Sipek471b17e2006-12-08 02:37:07 -0800304 write = proc_file->f_path.dentry->d_inode->i_fop->write;
Jeff Dikea0612b12008-05-12 14:01:49 -0700305 return (*write)(proc_file, buf, len, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306}
307
308static int open_host_sock(char *host_file, int *filter_out)
309{
310 char *end;
311 int fd;
312
313 end = &host_file[strlen(host_file)];
314 strcpy(end, "/rw");
315 *filter_out = 1;
316 fd = os_connect_socket(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500317 if (fd > 0)
318 return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 strcpy(end, "/r");
321 *filter_out = 0;
322 fd = os_connect_socket(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500323 return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324}
325
326static void free_contents(struct hppfs_data *head)
327{
328 struct hppfs_data *data;
329 struct list_head *ele, *next;
330
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500331 if (head == NULL)
332 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500334 list_for_each_safe(ele, next, &head->list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 data = list_entry(ele, struct hppfs_data, list);
336 kfree(data);
337 }
338 kfree(head);
339}
340
341static struct hppfs_data *hppfs_get_data(int fd, int filter,
342 struct file *proc_file,
343 struct file *hppfs_file,
344 loff_t *size_out)
345{
346 struct hppfs_data *data, *new, *head;
347 int n, err;
348
349 err = -ENOMEM;
350 data = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500351 if (data == NULL) {
352 printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 goto failed;
354 }
355
356 INIT_LIST_HEAD(&data->list);
357
358 head = data;
359 *size_out = 0;
360
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500361 if (filter) {
362 while ((n = read_proc(proc_file, data->contents,
Jeff Dikea0612b12008-05-12 14:01:49 -0700363 sizeof(data->contents), NULL, 0)) > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 os_write_file(fd, data->contents, n);
365 err = os_shutdown_socket(fd, 0, 1);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500366 if (err) {
367 printk(KERN_ERR "hppfs_get_data : failed to shut down "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 "socket\n");
369 goto failed_free;
370 }
371 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500372 while (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 n = os_read_file(fd, data->contents, sizeof(data->contents));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500374 if (n < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 err = n;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500376 printk(KERN_ERR "hppfs_get_data : read failed, "
377 "errno = %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 goto failed_free;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500379 } else if (n == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 break;
381
382 *size_out += n;
383
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500384 if (n < sizeof(data->contents))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 break;
386
387 new = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500388 if (new == 0) {
389 printk(KERN_ERR "hppfs_get_data : data allocation "
390 "failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 err = -ENOMEM;
392 goto failed_free;
393 }
394
395 INIT_LIST_HEAD(&new->list);
396 list_add(&new->list, &data->list);
397 data = new;
398 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500399 return head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 failed_free:
402 free_contents(head);
403 failed:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500404 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
407static struct hppfs_private *hppfs_data(void)
408{
409 struct hppfs_private *data;
410
411 data = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500412 if (data == NULL)
413 return data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
415 *data = ((struct hppfs_private ) { .host_fd = -1,
416 .len = -1,
417 .contents = NULL } );
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500418 return data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419}
420
421static int file_mode(int fmode)
422{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500423 if (fmode == (FMODE_READ | FMODE_WRITE))
424 return O_RDWR;
425 if (fmode == FMODE_READ)
426 return O_RDONLY;
427 if (fmode == FMODE_WRITE)
428 return O_WRONLY;
429 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431
432static int hppfs_open(struct inode *inode, struct file *file)
433{
David Howellsd76b0d92008-11-14 10:39:25 +1100434 const struct cred *cred = file->f_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 struct hppfs_private *data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500436 struct vfsmount *proc_mnt;
Jeff Dikea0612b12008-05-12 14:01:49 -0700437 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 char *host_file;
439 int err, fd, type, filter;
440
441 err = -ENOMEM;
442 data = hppfs_data();
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500443 if (data == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 goto out;
445
Josef Sipek471b17e2006-12-08 02:37:07 -0800446 host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500447 if (host_file == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 goto out_free2;
449
450 proc_dentry = HPPFS_I(inode)->proc_dentry;
Al Virof382d6e2008-02-23 04:53:53 -0500451 proc_mnt = inode->i_sb->s_fs_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 /* XXX This isn't closed anywhere */
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500454 data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
David Howells745ca242008-11-14 10:39:22 +1100455 file_mode(file->f_mode), cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 err = PTR_ERR(data->proc_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500457 if (IS_ERR(data->proc_file))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 goto out_free1;
459
460 type = os_file_type(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500461 if (type == OS_TYPE_FILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500463 if (fd >= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 data->host_fd = fd;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500465 else
466 printk(KERN_ERR "hppfs_open : failed to open '%s', "
467 "errno = %d\n", host_file, -fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 data->contents = NULL;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500470 } else if (type == OS_TYPE_DIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 fd = open_host_sock(host_file, &filter);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500472 if (fd > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 data->contents = hppfs_get_data(fd, filter,
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700474 data->proc_file,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 file, &data->len);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500476 if (!IS_ERR(data->contents))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 data->host_fd = fd;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500478 } else
479 printk(KERN_ERR "hppfs_open : failed to open a socket "
480 "in '%s', errno = %d\n", host_file, -fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 }
482 kfree(host_file);
483
484 file->private_data = data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500485 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 out_free1:
488 kfree(host_file);
489 out_free2:
490 free_contents(data->contents);
491 kfree(data);
492 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500493 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
496static int hppfs_dir_open(struct inode *inode, struct file *file)
497{
David Howellsd76b0d92008-11-14 10:39:25 +1100498 const struct cred *cred = file->f_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 struct hppfs_private *data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500500 struct vfsmount *proc_mnt;
Jeff Dikea0612b12008-05-12 14:01:49 -0700501 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 int err;
503
504 err = -ENOMEM;
505 data = hppfs_data();
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500506 if (data == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 goto out;
508
509 proc_dentry = HPPFS_I(inode)->proc_dentry;
Al Virof382d6e2008-02-23 04:53:53 -0500510 proc_mnt = inode->i_sb->s_fs_info;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500511 data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
David Howells745ca242008-11-14 10:39:22 +1100512 file_mode(file->f_mode), cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 err = PTR_ERR(data->proc_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500514 if (IS_ERR(data->proc_file))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 goto out_free;
516
517 file->private_data = data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500518 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 out_free:
521 kfree(data);
522 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500523 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524}
525
526static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
527{
528 struct hppfs_private *data = file->private_data;
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700529 struct file *proc_file = data->proc_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 loff_t (*llseek)(struct file *, loff_t, int);
531 loff_t ret;
532
Josef Sipek471b17e2006-12-08 02:37:07 -0800533 llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500534 if (llseek != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 ret = (*llseek)(proc_file, off, where);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500536 if (ret < 0)
537 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 }
539
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500540 return default_llseek(file, off, where);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800543static const struct file_operations hppfs_file_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 .owner = NULL,
545 .llseek = hppfs_llseek,
546 .read = hppfs_read,
547 .write = hppfs_write,
548 .open = hppfs_open,
549};
550
551struct hppfs_dirent {
552 void *vfs_dirent;
553 filldir_t filldir;
554 struct dentry *dentry;
555};
556
557static int hppfs_filldir(void *d, const char *name, int size,
Al Viroc8adf942006-10-09 20:26:58 +0100558 loff_t offset, u64 inode, unsigned int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
560 struct hppfs_dirent *dirent = d;
561
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500562 if (file_removed(dirent->dentry, name))
563 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500565 return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
566 inode, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
569static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
570{
571 struct hppfs_private *data = file->private_data;
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700572 struct file *proc_file = data->proc_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 int (*readdir)(struct file *, void *, filldir_t);
574 struct hppfs_dirent dirent = ((struct hppfs_dirent)
575 { .vfs_dirent = ent,
576 .filldir = filldir,
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500577 .dentry = file->f_path.dentry
578 });
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 int err;
580
Josef Sipek471b17e2006-12-08 02:37:07 -0800581 readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583 proc_file->f_pos = file->f_pos;
584 err = (*readdir)(proc_file, &dirent, hppfs_filldir);
585 file->f_pos = proc_file->f_pos;
586
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500587 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
590static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync)
591{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500592 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593}
594
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800595static const struct file_operations hppfs_dir_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 .owner = NULL,
597 .readdir = hppfs_readdir,
598 .open = hppfs_dir_open,
599 .fsync = hppfs_fsync,
600};
601
David Howells726c3342006-06-23 02:02:58 -0700602static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603{
604 sf->f_blocks = 0;
605 sf->f_bfree = 0;
606 sf->f_bavail = 0;
607 sf->f_files = 0;
608 sf->f_ffree = 0;
609 sf->f_type = HPPFS_SUPER_MAGIC;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500610 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}
612
613static struct inode *hppfs_alloc_inode(struct super_block *sb)
614{
615 struct hppfs_inode_info *hi;
616
617 hi = kmalloc(sizeof(*hi), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500618 if (!hi)
619 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500621 hi->proc_dentry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 inode_init_once(&hi->vfs_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500623 return &hi->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624}
625
626void hppfs_delete_inode(struct inode *ino)
627{
Jeff Dikea0612b12008-05-12 14:01:49 -0700628 dput(HPPFS_I(ino)->proc_dentry);
629 mntput(ino->i_sb->s_fs_info);
630
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 clear_inode(ino);
632}
633
634static void hppfs_destroy_inode(struct inode *inode)
635{
636 kfree(HPPFS_I(inode));
637}
638
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800639static const struct super_operations hppfs_sbops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 .alloc_inode = hppfs_alloc_inode,
641 .destroy_inode = hppfs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 .delete_inode = hppfs_delete_inode,
643 .statfs = hppfs_statfs,
644};
645
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500646static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
647 int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648{
Al Viro7b264fc2009-12-23 00:43:50 -0500649 struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
Jeff Dikea0612b12008-05-12 14:01:49 -0700650 return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
651 buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652}
653
Jeff Dikea0612b12008-05-12 14:01:49 -0700654static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Al Viro7b264fc2009-12-23 00:43:50 -0500656 struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500657
Jeff Dikea0612b12008-05-12 14:01:49 -0700658 return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
659}
Paolo 'Blaisorblade' Giarrussod7a60d52005-08-26 16:57:44 +0200660
Al Viro7b264fc2009-12-23 00:43:50 -0500661static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
662 void *cookie)
663{
664 struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
665
666 if (proc_dentry->d_inode->i_op->put_link)
667 proc_dentry->d_inode->i_op->put_link(proc_dentry, nd, cookie);
668}
669
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800670static const struct inode_operations hppfs_dir_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 .lookup = hppfs_lookup,
672};
673
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800674static const struct inode_operations hppfs_link_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 .readlink = hppfs_readlink,
676 .follow_link = hppfs_follow_link,
Al Viro7b264fc2009-12-23 00:43:50 -0500677 .put_link = hppfs_put_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678};
679
Al Virof382d6e2008-02-23 04:53:53 -0500680static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
Al Virof382d6e2008-02-23 04:53:53 -0500682 struct inode *proc_ino = dentry->d_inode;
683 struct inode *inode = new_inode(sb);
684
685 if (!inode)
686 return ERR_PTR(-ENOMEM);
687
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500688 if (S_ISDIR(dentry->d_inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 inode->i_op = &hppfs_dir_iops;
690 inode->i_fop = &hppfs_dir_fops;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500691 } else if (S_ISLNK(dentry->d_inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 inode->i_op = &hppfs_link_iops;
693 inode->i_fop = &hppfs_file_fops;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500694 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 inode->i_op = &hppfs_file_iops;
696 inode->i_fop = &hppfs_file_fops;
697 }
698
Jeff Dikea0612b12008-05-12 14:01:49 -0700699 HPPFS_I(inode)->proc_dentry = dget(dentry);
Al Virof382d6e2008-02-23 04:53:53 -0500700
701 inode->i_uid = proc_ino->i_uid;
702 inode->i_gid = proc_ino->i_gid;
703 inode->i_atime = proc_ino->i_atime;
704 inode->i_mtime = proc_ino->i_mtime;
705 inode->i_ctime = proc_ino->i_ctime;
706 inode->i_ino = proc_ino->i_ino;
707 inode->i_mode = proc_ino->i_mode;
708 inode->i_nlink = proc_ino->i_nlink;
709 inode->i_size = proc_ino->i_size;
710 inode->i_blocks = proc_ino->i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Jeff Dikea0612b12008-05-12 14:01:49 -0700712 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713}
714
715static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
716{
717 struct inode *root_inode;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500718 struct vfsmount *proc_mnt;
Al Virof382d6e2008-02-23 04:53:53 -0500719 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Al Virof382d6e2008-02-23 04:53:53 -0500721 proc_mnt = do_kern_mount("proc", 0, "proc", NULL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500722 if (IS_ERR(proc_mnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 goto out;
724
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 sb->s_blocksize = 1024;
726 sb->s_blocksize_bits = 10;
727 sb->s_magic = HPPFS_SUPER_MAGIC;
728 sb->s_op = &hppfs_sbops;
Al Virof382d6e2008-02-23 04:53:53 -0500729 sb->s_fs_info = proc_mnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
731 err = -ENOMEM;
Al Virof382d6e2008-02-23 04:53:53 -0500732 root_inode = get_inode(sb, proc_mnt->mnt_sb->s_root);
733 if (!root_inode)
734 goto out_mntput;
735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 sb->s_root = d_alloc_root(root_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500737 if (!sb->s_root)
738 goto out_iput;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500740 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500742 out_iput:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 iput(root_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500744 out_mntput:
745 mntput(proc_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 out:
747 return(err);
748}
749
David Howells454e2392006-06-23 02:02:57 -0700750static int hppfs_read_super(struct file_system_type *type,
751 int flags, const char *dev_name,
752 void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753{
David Howells454e2392006-06-23 02:02:57 -0700754 return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755}
756
757static struct file_system_type hppfs_type = {
758 .owner = THIS_MODULE,
759 .name = "hppfs",
760 .get_sb = hppfs_read_super,
761 .kill_sb = kill_anon_super,
762 .fs_flags = 0,
763};
764
765static int __init init_hppfs(void)
766{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500767 return register_filesystem(&hppfs_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768}
769
770static void __exit exit_hppfs(void)
771{
772 unregister_filesystem(&hppfs_type);
773}
774
775module_init(init_hppfs)
776module_exit(exit_hppfs)
777MODULE_LICENSE("GPL");