blob: 87ed48e0343d701fe621fa1751390bfdfbec06f7 [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>
Al Viro918377b2010-06-06 23:56:02 -040018#include <linux/pid_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "os.h"
21
Al Virof382d6e2008-02-23 04:53:53 -050022static struct inode *get_inode(struct super_block *, struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24struct hppfs_data {
25 struct list_head list;
26 char contents[PAGE_SIZE - sizeof(struct list_head)];
27};
28
29struct hppfs_private {
30 struct file *proc_file;
31 int host_fd;
32 loff_t len;
33 struct hppfs_data *contents;
34};
35
36struct hppfs_inode_info {
Jeff Dikea0612b12008-05-12 14:01:49 -070037 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 struct inode vfs_inode;
39};
40
41static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode)
42{
Paolo 'Blaisorblade' Giarrussofd589e02005-08-26 16:57:53 +020043 return container_of(inode, struct hppfs_inode_info, vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044}
45
46#define HPPFS_SUPER_MAGIC 0xb00000ee
47
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080048static const struct super_operations hppfs_sbops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50static int is_pid(struct dentry *dentry)
51{
52 struct super_block *sb;
53 int i;
54
55 sb = dentry->d_sb;
Jeff Dikea0612b12008-05-12 14:01:49 -070056 if (dentry->d_parent != sb->s_root)
Dave Hansen1dd0dd12008-02-15 18:37:00 -050057 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Dave Hansen1dd0dd12008-02-15 18:37:00 -050059 for (i = 0; i < dentry->d_name.len; i++) {
60 if (!isdigit(dentry->d_name.name[i]))
61 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -050063 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
66static char *dentry_name(struct dentry *dentry, int extra)
67{
68 struct dentry *parent;
69 char *root, *name;
70 const char *seg_name;
71 int len, seg_len;
72
73 len = 0;
74 parent = dentry;
Dave Hansen1dd0dd12008-02-15 18:37:00 -050075 while (parent->d_parent != parent) {
76 if (is_pid(parent))
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 len += strlen("pid") + 1;
78 else len += parent->d_name.len + 1;
79 parent = parent->d_parent;
80 }
81
82 root = "proc";
83 len += strlen(root);
84 name = kmalloc(len + extra + 1, GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -050085 if (name == NULL)
86 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 name[len] = '\0';
89 parent = dentry;
Dave Hansen1dd0dd12008-02-15 18:37:00 -050090 while (parent->d_parent != parent) {
91 if (is_pid(parent)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 seg_name = "pid";
93 seg_len = strlen("pid");
94 }
95 else {
96 seg_name = parent->d_name.name;
97 seg_len = parent->d_name.len;
98 }
99
100 len -= seg_len + 1;
101 name[len] = '/';
102 strncpy(&name[len + 1], seg_name, seg_len);
103 parent = parent->d_parent;
104 }
105 strncpy(name, root, strlen(root));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500106 return name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109static int file_removed(struct dentry *dentry, const char *file)
110{
111 char *host_file;
112 int extra, fd;
113
114 extra = 0;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500115 if (file != NULL)
116 extra += strlen(file) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118 host_file = dentry_name(dentry, extra + strlen("/remove"));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500119 if (host_file == NULL) {
120 printk(KERN_ERR "file_removed : allocation failed\n");
121 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 }
123
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500124 if (file != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 strcat(host_file, "/");
126 strcat(host_file, file);
127 }
128 strcat(host_file, "/remove");
129
130 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
131 kfree(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500132 if (fd > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 os_close_file(fd);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500134 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500136 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
Jeff Dikea0612b12008-05-12 14:01:49 -0700140 struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
142 struct dentry *proc_dentry, *new, *parent;
143 struct inode *inode;
144 int err, deleted;
145
146 deleted = file_removed(dentry, NULL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500147 if (deleted < 0)
148 return ERR_PTR(deleted);
149 else if (deleted)
150 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 err = -ENOMEM;
153 parent = HPPFS_I(ino)->proc_dentry;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800154 mutex_lock(&parent->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 proc_dentry = d_lookup(parent, &dentry->d_name);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500156 if (proc_dentry == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 proc_dentry = d_alloc(parent, &dentry->d_name);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500158 if (proc_dentry == NULL) {
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800159 mutex_unlock(&parent->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 goto out;
161 }
162 new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
163 proc_dentry, NULL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500164 if (new) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 dput(proc_dentry);
166 proc_dentry = new;
167 }
168 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800169 mutex_unlock(&parent->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500171 if (IS_ERR(proc_dentry))
172 return proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Al Virof382d6e2008-02-23 04:53:53 -0500174 err = -ENOMEM;
175 inode = get_inode(ino->i_sb, proc_dentry);
176 if (!inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 goto out_dput;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 d_add(dentry, inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500180 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 out_dput:
183 dput(proc_dentry);
184 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500185 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800188static const struct inode_operations hppfs_file_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189};
190
Al Viro347f2172006-03-31 02:30:16 -0800191static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 loff_t *ppos, int is_user)
193{
Al Viro347f2172006-03-31 02:30:16 -0800194 ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 ssize_t n;
196
Josef Sipek471b17e2006-12-08 02:37:07 -0800197 read = file->f_path.dentry->d_inode->i_fop->read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500199 if (!is_user)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 set_fs(KERNEL_DS);
201
202 n = (*read)(file, buf, count, &file->f_pos);
203
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500204 if (!is_user)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 set_fs(USER_DS);
206
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500207 if (ppos)
208 *ppos = file->f_pos;
Paolo 'Blaisorblade' Giarrusso8e0a2182005-07-14 00:33:41 -0700209 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210}
211
Al Viro347f2172006-03-31 02:30:16 -0800212static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
214 ssize_t n;
215 int cur, err;
216 char *new_buf;
217
218 n = -ENOMEM;
219 new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500220 if (new_buf == NULL) {
221 printk(KERN_ERR "hppfs_read_file : kmalloc failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 goto out;
223 }
224 n = 0;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500225 while (count > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 cur = min_t(ssize_t, count, PAGE_SIZE);
227 err = os_read_file(fd, new_buf, cur);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500228 if (err < 0) {
229 printk(KERN_ERR "hppfs_read : read failed, "
230 "errno = %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 n = err;
232 goto out_free;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500233 } else if (err == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 break;
235
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500236 if (copy_to_user(buf, new_buf, err)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 n = -EFAULT;
238 goto out_free;
239 }
240 n += err;
241 count -= err;
242 }
243 out_free:
244 kfree(new_buf);
245 out:
Paolo 'Blaisorblade' Giarrusso8e0a2182005-07-14 00:33:41 -0700246 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
Al Viro347f2172006-03-31 02:30:16 -0800249static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 loff_t *ppos)
251{
252 struct hppfs_private *hppfs = file->private_data;
253 struct hppfs_data *data;
254 loff_t off;
255 int err;
256
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500257 if (hppfs->contents != NULL) {
Jeff Dikea0612b12008-05-12 14:01:49 -0700258 int rem;
259
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500260 if (*ppos >= hppfs->len)
261 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 data = hppfs->contents;
264 off = *ppos;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500265 while (off >= sizeof(data->contents)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 data = list_entry(data->list.next, struct hppfs_data,
267 list);
268 off -= sizeof(data->contents);
269 }
270
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500271 if (off + count > hppfs->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 count = hppfs->len - off;
Jeff Dikea0612b12008-05-12 14:01:49 -0700273 rem = copy_to_user(buf, &data->contents[off], count);
274 *ppos += count - rem;
275 if (rem > 0)
276 return -EFAULT;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500277 } else if (hppfs->host_fd != -1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 err = os_seek_file(hppfs->host_fd, *ppos);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500279 if (err) {
280 printk(KERN_ERR "hppfs_read : seek failed, "
281 "errno = %d\n", err);
282 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
Roel Kluin880fe762009-04-02 16:57:18 -0700284 err = hppfs_read_file(hppfs->host_fd, buf, count);
285 if (err < 0) {
286 printk(KERN_ERR "hppfs_read: read failed: %d\n", err);
287 return err;
288 }
289 count = err;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500290 if (count > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 *ppos += count;
292 }
293 else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
294
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500295 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
Jeff Dikea0612b12008-05-12 14:01:49 -0700298static ssize_t hppfs_write(struct file *file, const char __user *buf,
299 size_t len, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 struct hppfs_private *data = file->private_data;
302 struct file *proc_file = data->proc_file;
Al Viro347f2172006-03-31 02:30:16 -0800303 ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Josef Sipek471b17e2006-12-08 02:37:07 -0800305 write = proc_file->f_path.dentry->d_inode->i_fop->write;
Jeff Dikea0612b12008-05-12 14:01:49 -0700306 return (*write)(proc_file, buf, len, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
309static int open_host_sock(char *host_file, int *filter_out)
310{
311 char *end;
312 int fd;
313
314 end = &host_file[strlen(host_file)];
315 strcpy(end, "/rw");
316 *filter_out = 1;
317 fd = os_connect_socket(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500318 if (fd > 0)
319 return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 strcpy(end, "/r");
322 *filter_out = 0;
323 fd = os_connect_socket(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500324 return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
326
327static void free_contents(struct hppfs_data *head)
328{
329 struct hppfs_data *data;
330 struct list_head *ele, *next;
331
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500332 if (head == NULL)
333 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500335 list_for_each_safe(ele, next, &head->list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 data = list_entry(ele, struct hppfs_data, list);
337 kfree(data);
338 }
339 kfree(head);
340}
341
342static struct hppfs_data *hppfs_get_data(int fd, int filter,
343 struct file *proc_file,
344 struct file *hppfs_file,
345 loff_t *size_out)
346{
347 struct hppfs_data *data, *new, *head;
348 int n, err;
349
350 err = -ENOMEM;
351 data = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500352 if (data == NULL) {
353 printk(KERN_ERR "hppfs_get_data : head allocation failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 goto failed;
355 }
356
357 INIT_LIST_HEAD(&data->list);
358
359 head = data;
360 *size_out = 0;
361
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500362 if (filter) {
363 while ((n = read_proc(proc_file, data->contents,
Jeff Dikea0612b12008-05-12 14:01:49 -0700364 sizeof(data->contents), NULL, 0)) > 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 os_write_file(fd, data->contents, n);
366 err = os_shutdown_socket(fd, 0, 1);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500367 if (err) {
368 printk(KERN_ERR "hppfs_get_data : failed to shut down "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 "socket\n");
370 goto failed_free;
371 }
372 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500373 while (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 n = os_read_file(fd, data->contents, sizeof(data->contents));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500375 if (n < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 err = n;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500377 printk(KERN_ERR "hppfs_get_data : read failed, "
378 "errno = %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 goto failed_free;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500380 } else if (n == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 break;
382
383 *size_out += n;
384
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500385 if (n < sizeof(data->contents))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 break;
387
388 new = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500389 if (new == 0) {
390 printk(KERN_ERR "hppfs_get_data : data allocation "
391 "failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 err = -ENOMEM;
393 goto failed_free;
394 }
395
396 INIT_LIST_HEAD(&new->list);
397 list_add(&new->list, &data->list);
398 data = new;
399 }
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500400 return head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 failed_free:
403 free_contents(head);
404 failed:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500405 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406}
407
408static struct hppfs_private *hppfs_data(void)
409{
410 struct hppfs_private *data;
411
412 data = kmalloc(sizeof(*data), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500413 if (data == NULL)
414 return data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
416 *data = ((struct hppfs_private ) { .host_fd = -1,
417 .len = -1,
418 .contents = NULL } );
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500419 return data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
421
422static int file_mode(int fmode)
423{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500424 if (fmode == (FMODE_READ | FMODE_WRITE))
425 return O_RDWR;
426 if (fmode == FMODE_READ)
427 return O_RDONLY;
428 if (fmode == FMODE_WRITE)
429 return O_WRONLY;
430 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
433static int hppfs_open(struct inode *inode, struct file *file)
434{
David Howellsd76b0d92008-11-14 10:39:25 +1100435 const struct cred *cred = file->f_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 struct hppfs_private *data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500437 struct vfsmount *proc_mnt;
Jeff Dikea0612b12008-05-12 14:01:49 -0700438 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 char *host_file;
440 int err, fd, type, filter;
441
442 err = -ENOMEM;
443 data = hppfs_data();
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500444 if (data == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 goto out;
446
Josef Sipek471b17e2006-12-08 02:37:07 -0800447 host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500448 if (host_file == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 goto out_free2;
450
451 proc_dentry = HPPFS_I(inode)->proc_dentry;
Al Virof382d6e2008-02-23 04:53:53 -0500452 proc_mnt = inode->i_sb->s_fs_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454 /* XXX This isn't closed anywhere */
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500455 data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
David Howells745ca242008-11-14 10:39:22 +1100456 file_mode(file->f_mode), cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 err = PTR_ERR(data->proc_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500458 if (IS_ERR(data->proc_file))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 goto out_free1;
460
461 type = os_file_type(host_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500462 if (type == OS_TYPE_FILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500464 if (fd >= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 data->host_fd = fd;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500466 else
467 printk(KERN_ERR "hppfs_open : failed to open '%s', "
468 "errno = %d\n", host_file, -fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 data->contents = NULL;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500471 } else if (type == OS_TYPE_DIR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 fd = open_host_sock(host_file, &filter);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500473 if (fd > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 data->contents = hppfs_get_data(fd, filter,
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700475 data->proc_file,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 file, &data->len);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500477 if (!IS_ERR(data->contents))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 data->host_fd = fd;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500479 } else
480 printk(KERN_ERR "hppfs_open : failed to open a socket "
481 "in '%s', errno = %d\n", host_file, -fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
483 kfree(host_file);
484
485 file->private_data = data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500486 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 out_free1:
489 kfree(host_file);
490 out_free2:
491 free_contents(data->contents);
492 kfree(data);
493 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500494 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495}
496
497static int hppfs_dir_open(struct inode *inode, struct file *file)
498{
David Howellsd76b0d92008-11-14 10:39:25 +1100499 const struct cred *cred = file->f_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 struct hppfs_private *data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500501 struct vfsmount *proc_mnt;
Jeff Dikea0612b12008-05-12 14:01:49 -0700502 struct dentry *proc_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 int err;
504
505 err = -ENOMEM;
506 data = hppfs_data();
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500507 if (data == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 goto out;
509
510 proc_dentry = HPPFS_I(inode)->proc_dentry;
Al Virof382d6e2008-02-23 04:53:53 -0500511 proc_mnt = inode->i_sb->s_fs_info;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500512 data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
David Howells745ca242008-11-14 10:39:22 +1100513 file_mode(file->f_mode), cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 err = PTR_ERR(data->proc_file);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500515 if (IS_ERR(data->proc_file))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 goto out_free;
517
518 file->private_data = data;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500519 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 out_free:
522 kfree(data);
523 out:
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500524 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525}
526
527static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
528{
529 struct hppfs_private *data = file->private_data;
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700530 struct file *proc_file = data->proc_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 loff_t (*llseek)(struct file *, loff_t, int);
532 loff_t ret;
533
Josef Sipek471b17e2006-12-08 02:37:07 -0800534 llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500535 if (llseek != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 ret = (*llseek)(proc_file, off, where);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500537 if (ret < 0)
538 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 }
540
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500541 return default_llseek(file, off, where);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542}
543
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800544static const struct file_operations hppfs_file_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 .owner = NULL,
546 .llseek = hppfs_llseek,
547 .read = hppfs_read,
548 .write = hppfs_write,
549 .open = hppfs_open,
550};
551
552struct hppfs_dirent {
553 void *vfs_dirent;
554 filldir_t filldir;
555 struct dentry *dentry;
556};
557
558static int hppfs_filldir(void *d, const char *name, int size,
Al Viroc8adf942006-10-09 20:26:58 +0100559 loff_t offset, u64 inode, unsigned int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
561 struct hppfs_dirent *dirent = d;
562
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500563 if (file_removed(dirent->dentry, name))
564 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500566 return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
567 inode, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568}
569
570static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
571{
572 struct hppfs_private *data = file->private_data;
Paolo 'Blaisorblade' Giarrusso3f580472005-07-07 17:56:51 -0700573 struct file *proc_file = data->proc_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 int (*readdir)(struct file *, void *, filldir_t);
575 struct hppfs_dirent dirent = ((struct hppfs_dirent)
576 { .vfs_dirent = ent,
577 .filldir = filldir,
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500578 .dentry = file->f_path.dentry
579 });
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 int err;
581
Josef Sipek471b17e2006-12-08 02:37:07 -0800582 readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 proc_file->f_pos = file->f_pos;
585 err = (*readdir)(proc_file, &dirent, hppfs_filldir);
586 file->f_pos = proc_file->f_pos;
587
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500588 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589}
590
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200591static int hppfs_fsync(struct file *file, int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500593 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800596static const struct file_operations hppfs_dir_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 .owner = NULL,
598 .readdir = hppfs_readdir,
599 .open = hppfs_dir_open,
600 .fsync = hppfs_fsync,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200601 .llseek = default_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602};
603
David Howells726c3342006-06-23 02:02:58 -0700604static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
606 sf->f_blocks = 0;
607 sf->f_bfree = 0;
608 sf->f_bavail = 0;
609 sf->f_files = 0;
610 sf->f_ffree = 0;
611 sf->f_type = HPPFS_SUPER_MAGIC;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500612 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613}
614
615static struct inode *hppfs_alloc_inode(struct super_block *sb)
616{
617 struct hppfs_inode_info *hi;
618
619 hi = kmalloc(sizeof(*hi), GFP_KERNEL);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500620 if (!hi)
621 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500623 hi->proc_dentry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 inode_init_once(&hi->vfs_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500625 return &hi->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626}
627
Al Viro33b0daa2010-06-07 00:12:50 -0400628void hppfs_evict_inode(struct inode *ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
Al Viro33b0daa2010-06-07 00:12:50 -0400630 end_writeback(ino);
Jeff Dikea0612b12008-05-12 14:01:49 -0700631 dput(HPPFS_I(ino)->proc_dentry);
632 mntput(ino->i_sb->s_fs_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633}
634
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100635static void hppfs_i_callback(struct rcu_head *head)
636{
637 struct inode *inode = container_of(head, struct inode, i_rcu);
638 INIT_LIST_HEAD(&inode->i_dentry);
639 kfree(HPPFS_I(inode));
640}
641
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642static void hppfs_destroy_inode(struct inode *inode)
643{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100644 call_rcu(&inode->i_rcu, hppfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645}
646
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800647static const struct super_operations hppfs_sbops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 .alloc_inode = hppfs_alloc_inode,
649 .destroy_inode = hppfs_destroy_inode,
Al Viro33b0daa2010-06-07 00:12:50 -0400650 .evict_inode = hppfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 .statfs = hppfs_statfs,
652};
653
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500654static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
655 int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
Al Viro7b264fc2009-12-23 00:43:50 -0500657 struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
Jeff Dikea0612b12008-05-12 14:01:49 -0700658 return proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer,
659 buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660}
661
Jeff Dikea0612b12008-05-12 14:01:49 -0700662static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663{
Al Viro7b264fc2009-12-23 00:43:50 -0500664 struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500665
Jeff Dikea0612b12008-05-12 14:01:49 -0700666 return proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
667}
Paolo 'Blaisorblade' Giarrussod7a60d52005-08-26 16:57:44 +0200668
Al Viro7b264fc2009-12-23 00:43:50 -0500669static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
670 void *cookie)
671{
672 struct dentry *proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
673
674 if (proc_dentry->d_inode->i_op->put_link)
675 proc_dentry->d_inode->i_op->put_link(proc_dentry, nd, cookie);
676}
677
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800678static const struct inode_operations hppfs_dir_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 .lookup = hppfs_lookup,
680};
681
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800682static const struct inode_operations hppfs_link_iops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 .readlink = hppfs_readlink,
684 .follow_link = hppfs_follow_link,
Al Viro7b264fc2009-12-23 00:43:50 -0500685 .put_link = hppfs_put_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686};
687
Al Virof382d6e2008-02-23 04:53:53 -0500688static struct inode *get_inode(struct super_block *sb, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
Al Virof382d6e2008-02-23 04:53:53 -0500690 struct inode *proc_ino = dentry->d_inode;
691 struct inode *inode = new_inode(sb);
692
693 if (!inode)
694 return ERR_PTR(-ENOMEM);
695
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500696 if (S_ISDIR(dentry->d_inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 inode->i_op = &hppfs_dir_iops;
698 inode->i_fop = &hppfs_dir_fops;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500699 } else if (S_ISLNK(dentry->d_inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 inode->i_op = &hppfs_link_iops;
701 inode->i_fop = &hppfs_file_fops;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500702 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 inode->i_op = &hppfs_file_iops;
704 inode->i_fop = &hppfs_file_fops;
705 }
706
Jeff Dikea0612b12008-05-12 14:01:49 -0700707 HPPFS_I(inode)->proc_dentry = dget(dentry);
Al Virof382d6e2008-02-23 04:53:53 -0500708
709 inode->i_uid = proc_ino->i_uid;
710 inode->i_gid = proc_ino->i_gid;
711 inode->i_atime = proc_ino->i_atime;
712 inode->i_mtime = proc_ino->i_mtime;
713 inode->i_ctime = proc_ino->i_ctime;
714 inode->i_ino = proc_ino->i_ino;
715 inode->i_mode = proc_ino->i_mode;
716 inode->i_nlink = proc_ino->i_nlink;
717 inode->i_size = proc_ino->i_size;
718 inode->i_blocks = proc_ino->i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Jeff Dikea0612b12008-05-12 14:01:49 -0700720 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721}
722
723static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
724{
725 struct inode *root_inode;
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500726 struct vfsmount *proc_mnt;
Al Virof382d6e2008-02-23 04:53:53 -0500727 int err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Al Viro0ceeca52010-02-05 09:34:36 -0500729 proc_mnt = mntget(current->nsproxy->pid_ns->proc_mnt);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500730 if (IS_ERR(proc_mnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 goto out;
732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 sb->s_blocksize = 1024;
734 sb->s_blocksize_bits = 10;
735 sb->s_magic = HPPFS_SUPER_MAGIC;
736 sb->s_op = &hppfs_sbops;
Al Virof382d6e2008-02-23 04:53:53 -0500737 sb->s_fs_info = proc_mnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 err = -ENOMEM;
Al Virof382d6e2008-02-23 04:53:53 -0500740 root_inode = get_inode(sb, proc_mnt->mnt_sb->s_root);
741 if (!root_inode)
742 goto out_mntput;
743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 sb->s_root = d_alloc_root(root_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500745 if (!sb->s_root)
746 goto out_iput;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500748 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500750 out_iput:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 iput(root_inode);
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500752 out_mntput:
753 mntput(proc_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 out:
755 return(err);
756}
757
Al Viro3c26ff62010-07-25 11:46:36 +0400758static struct dentry *hppfs_read_super(struct file_system_type *type,
David Howells454e2392006-06-23 02:02:57 -0700759 int flags, const char *dev_name,
Al Viro3c26ff62010-07-25 11:46:36 +0400760 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
Al Viro3c26ff62010-07-25 11:46:36 +0400762 return mount_nodev(type, flags, data, hppfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
765static struct file_system_type hppfs_type = {
766 .owner = THIS_MODULE,
767 .name = "hppfs",
Al Viro3c26ff62010-07-25 11:46:36 +0400768 .mount = hppfs_read_super,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 .kill_sb = kill_anon_super,
770 .fs_flags = 0,
771};
772
773static int __init init_hppfs(void)
774{
Dave Hansen1dd0dd12008-02-15 18:37:00 -0500775 return register_filesystem(&hppfs_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776}
777
778static void __exit exit_hppfs(void)
779{
780 unregister_filesystem(&hppfs_type);
781}
782
783module_init(init_hppfs)
784module_exit(exit_hppfs)
785MODULE_LICENSE("GPL");