Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1dd0dd11 | 2 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
1dd0dd11 DH |
6 | #include <linux/ctype.h> |
7 | #include <linux/dcache.h> | |
3f580470 | 8 | #include <linux/file.h> |
1dd0dd11 | 9 | #include <linux/fs.h> |
1da177e4 | 10 | #include <linux/init.h> |
1da177e4 | 11 | #include <linux/kernel.h> |
1dd0dd11 DH |
12 | #include <linux/list.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/mount.h> | |
15 | #include <linux/slab.h> | |
1da177e4 | 16 | #include <linux/statfs.h> |
1dd0dd11 | 17 | #include <linux/types.h> |
1da177e4 | 18 | #include <asm/uaccess.h> |
1da177e4 LT |
19 | #include "os.h" |
20 | ||
1dd0dd11 DH |
21 | static int init_inode(struct inode *inode, struct dentry *dentry, |
22 | struct vfsmount *mnt); | |
1da177e4 LT |
23 | |
24 | struct hppfs_data { | |
25 | struct list_head list; | |
26 | char contents[PAGE_SIZE - sizeof(struct list_head)]; | |
27 | }; | |
28 | ||
29 | struct hppfs_private { | |
30 | struct file *proc_file; | |
31 | int host_fd; | |
32 | loff_t len; | |
33 | struct hppfs_data *contents; | |
34 | }; | |
35 | ||
36 | struct hppfs_inode_info { | |
37 | struct dentry *proc_dentry; | |
1dd0dd11 | 38 | struct vfsmount *proc_mnt; |
1da177e4 LT |
39 | struct inode vfs_inode; |
40 | }; | |
41 | ||
42 | static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode) | |
43 | { | |
fd589e0b | 44 | return container_of(inode, struct hppfs_inode_info, vfs_inode); |
1da177e4 LT |
45 | } |
46 | ||
47 | #define HPPFS_SUPER_MAGIC 0xb00000ee | |
48 | ||
ee9b6d61 | 49 | static const struct super_operations hppfs_sbops; |
1da177e4 LT |
50 | |
51 | static int is_pid(struct dentry *dentry) | |
52 | { | |
53 | struct super_block *sb; | |
54 | int i; | |
55 | ||
56 | sb = dentry->d_sb; | |
1dd0dd11 DH |
57 | if ((sb->s_op != &hppfs_sbops) || (dentry->d_parent != sb->s_root)) |
58 | return 0; | |
1da177e4 | 59 | |
1dd0dd11 DH |
60 | for (i = 0; i < dentry->d_name.len; i++) { |
61 | if (!isdigit(dentry->d_name.name[i])) | |
62 | return 0; | |
1da177e4 | 63 | } |
1dd0dd11 | 64 | return 1; |
1da177e4 LT |
65 | } |
66 | ||
67 | static char *dentry_name(struct dentry *dentry, int extra) | |
68 | { | |
69 | struct dentry *parent; | |
70 | char *root, *name; | |
71 | const char *seg_name; | |
72 | int len, seg_len; | |
73 | ||
74 | len = 0; | |
75 | parent = dentry; | |
1dd0dd11 DH |
76 | while (parent->d_parent != parent) { |
77 | if (is_pid(parent)) | |
1da177e4 LT |
78 | len += strlen("pid") + 1; |
79 | else len += parent->d_name.len + 1; | |
80 | parent = parent->d_parent; | |
81 | } | |
82 | ||
83 | root = "proc"; | |
84 | len += strlen(root); | |
85 | name = kmalloc(len + extra + 1, GFP_KERNEL); | |
1dd0dd11 DH |
86 | if (name == NULL) |
87 | return NULL; | |
1da177e4 LT |
88 | |
89 | name[len] = '\0'; | |
90 | parent = dentry; | |
1dd0dd11 DH |
91 | while (parent->d_parent != parent) { |
92 | if (is_pid(parent)) { | |
1da177e4 LT |
93 | seg_name = "pid"; |
94 | seg_len = strlen("pid"); | |
95 | } | |
96 | else { | |
97 | seg_name = parent->d_name.name; | |
98 | seg_len = parent->d_name.len; | |
99 | } | |
100 | ||
101 | len -= seg_len + 1; | |
102 | name[len] = '/'; | |
103 | strncpy(&name[len + 1], seg_name, seg_len); | |
104 | parent = parent->d_parent; | |
105 | } | |
106 | strncpy(name, root, strlen(root)); | |
1dd0dd11 | 107 | return name; |
1da177e4 LT |
108 | } |
109 | ||
1da177e4 LT |
110 | static int file_removed(struct dentry *dentry, const char *file) |
111 | { | |
112 | char *host_file; | |
113 | int extra, fd; | |
114 | ||
115 | extra = 0; | |
1dd0dd11 DH |
116 | if (file != NULL) |
117 | extra += strlen(file) + 1; | |
1da177e4 LT |
118 | |
119 | host_file = dentry_name(dentry, extra + strlen("/remove")); | |
1dd0dd11 DH |
120 | if (host_file == NULL) { |
121 | printk(KERN_ERR "file_removed : allocation failed\n"); | |
122 | return -ENOMEM; | |
1da177e4 LT |
123 | } |
124 | ||
1dd0dd11 | 125 | if (file != NULL) { |
1da177e4 LT |
126 | strcat(host_file, "/"); |
127 | strcat(host_file, file); | |
128 | } | |
129 | strcat(host_file, "/remove"); | |
130 | ||
131 | fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); | |
132 | kfree(host_file); | |
1dd0dd11 | 133 | if (fd > 0) { |
1da177e4 | 134 | os_close_file(fd); |
1dd0dd11 | 135 | return 1; |
1da177e4 | 136 | } |
1dd0dd11 | 137 | return 0; |
1da177e4 LT |
138 | } |
139 | ||
140 | static void hppfs_read_inode(struct inode *ino) | |
141 | { | |
142 | struct inode *proc_ino; | |
143 | ||
1dd0dd11 | 144 | if (HPPFS_I(ino)->proc_dentry == NULL) |
1da177e4 LT |
145 | return; |
146 | ||
147 | proc_ino = HPPFS_I(ino)->proc_dentry->d_inode; | |
148 | ino->i_uid = proc_ino->i_uid; | |
149 | ino->i_gid = proc_ino->i_gid; | |
150 | ino->i_atime = proc_ino->i_atime; | |
151 | ino->i_mtime = proc_ino->i_mtime; | |
152 | ino->i_ctime = proc_ino->i_ctime; | |
153 | ino->i_ino = proc_ino->i_ino; | |
154 | ino->i_mode = proc_ino->i_mode; | |
155 | ino->i_nlink = proc_ino->i_nlink; | |
156 | ino->i_size = proc_ino->i_size; | |
1da177e4 LT |
157 | ino->i_blocks = proc_ino->i_blocks; |
158 | } | |
159 | ||
755aedc1 DH |
160 | static struct inode *hppfs_iget(struct super_block *sb) |
161 | { | |
162 | struct inode *inode; | |
163 | ||
164 | inode = iget_locked(sb, 0); | |
165 | if (!inode) | |
166 | return ERR_PTR(-ENOMEM); | |
167 | if (inode->i_state & I_NEW) { | |
168 | hppfs_read_inode(inode); | |
169 | unlock_new_inode(inode); | |
170 | } | |
171 | return inode; | |
172 | } | |
173 | ||
1da177e4 LT |
174 | static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry, |
175 | struct nameidata *nd) | |
176 | { | |
177 | struct dentry *proc_dentry, *new, *parent; | |
178 | struct inode *inode; | |
179 | int err, deleted; | |
180 | ||
181 | deleted = file_removed(dentry, NULL); | |
1dd0dd11 DH |
182 | if (deleted < 0) |
183 | return ERR_PTR(deleted); | |
184 | else if (deleted) | |
185 | return ERR_PTR(-ENOENT); | |
1da177e4 LT |
186 | |
187 | err = -ENOMEM; | |
188 | parent = HPPFS_I(ino)->proc_dentry; | |
1b1dcc1b | 189 | mutex_lock(&parent->d_inode->i_mutex); |
1da177e4 | 190 | proc_dentry = d_lookup(parent, &dentry->d_name); |
1dd0dd11 | 191 | if (proc_dentry == NULL) { |
1da177e4 | 192 | proc_dentry = d_alloc(parent, &dentry->d_name); |
1dd0dd11 | 193 | if (proc_dentry == NULL) { |
1b1dcc1b | 194 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
195 | goto out; |
196 | } | |
197 | new = (*parent->d_inode->i_op->lookup)(parent->d_inode, | |
198 | proc_dentry, NULL); | |
1dd0dd11 | 199 | if (new) { |
1da177e4 LT |
200 | dput(proc_dentry); |
201 | proc_dentry = new; | |
202 | } | |
203 | } | |
1b1dcc1b | 204 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 | 205 | |
1dd0dd11 DH |
206 | if (IS_ERR(proc_dentry)) |
207 | return proc_dentry; | |
1da177e4 | 208 | |
755aedc1 DH |
209 | inode = hppfs_iget(ino->i_sb); |
210 | if (IS_ERR(inode)) { | |
211 | err = PTR_ERR(inode); | |
1da177e4 | 212 | goto out_dput; |
755aedc1 | 213 | } |
1da177e4 | 214 | |
1dd0dd11 DH |
215 | err = init_inode(inode, proc_dentry, HPPFS_I(ino)->proc_mnt); |
216 | if (err) | |
1da177e4 LT |
217 | goto out_put; |
218 | ||
219 | hppfs_read_inode(inode); | |
220 | ||
221 | d_add(dentry, inode); | |
1dd0dd11 | 222 | return NULL; |
1da177e4 LT |
223 | |
224 | out_put: | |
225 | iput(inode); | |
226 | out_dput: | |
227 | dput(proc_dentry); | |
228 | out: | |
1dd0dd11 | 229 | return ERR_PTR(err); |
1da177e4 LT |
230 | } |
231 | ||
92e1d5be | 232 | static const struct inode_operations hppfs_file_iops = { |
1da177e4 LT |
233 | }; |
234 | ||
347f217c | 235 | static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count, |
1da177e4 LT |
236 | loff_t *ppos, int is_user) |
237 | { | |
347f217c | 238 | ssize_t (*read)(struct file *, char __user *, size_t, loff_t *); |
1da177e4 LT |
239 | ssize_t n; |
240 | ||
471b17e7 | 241 | read = file->f_path.dentry->d_inode->i_fop->read; |
1da177e4 | 242 | |
1dd0dd11 | 243 | if (!is_user) |
1da177e4 LT |
244 | set_fs(KERNEL_DS); |
245 | ||
246 | n = (*read)(file, buf, count, &file->f_pos); | |
247 | ||
1dd0dd11 | 248 | if (!is_user) |
1da177e4 LT |
249 | set_fs(USER_DS); |
250 | ||
1dd0dd11 DH |
251 | if (ppos) |
252 | *ppos = file->f_pos; | |
8e0a2181 | 253 | return n; |
1da177e4 LT |
254 | } |
255 | ||
347f217c | 256 | static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count) |
1da177e4 LT |
257 | { |
258 | ssize_t n; | |
259 | int cur, err; | |
260 | char *new_buf; | |
261 | ||
262 | n = -ENOMEM; | |
263 | new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1dd0dd11 DH |
264 | if (new_buf == NULL) { |
265 | printk(KERN_ERR "hppfs_read_file : kmalloc failed\n"); | |
1da177e4 LT |
266 | goto out; |
267 | } | |
268 | n = 0; | |
1dd0dd11 | 269 | while (count > 0) { |
1da177e4 LT |
270 | cur = min_t(ssize_t, count, PAGE_SIZE); |
271 | err = os_read_file(fd, new_buf, cur); | |
1dd0dd11 DH |
272 | if (err < 0) { |
273 | printk(KERN_ERR "hppfs_read : read failed, " | |
274 | "errno = %d\n", err); | |
1da177e4 LT |
275 | n = err; |
276 | goto out_free; | |
1dd0dd11 | 277 | } else if (err == 0) |
1da177e4 LT |
278 | break; |
279 | ||
1dd0dd11 | 280 | if (copy_to_user(buf, new_buf, err)) { |
1da177e4 LT |
281 | n = -EFAULT; |
282 | goto out_free; | |
283 | } | |
284 | n += err; | |
285 | count -= err; | |
286 | } | |
287 | out_free: | |
288 | kfree(new_buf); | |
289 | out: | |
8e0a2181 | 290 | return n; |
1da177e4 LT |
291 | } |
292 | ||
347f217c | 293 | static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count, |
1da177e4 LT |
294 | loff_t *ppos) |
295 | { | |
296 | struct hppfs_private *hppfs = file->private_data; | |
297 | struct hppfs_data *data; | |
298 | loff_t off; | |
299 | int err; | |
300 | ||
1dd0dd11 DH |
301 | if (hppfs->contents != NULL) { |
302 | if (*ppos >= hppfs->len) | |
303 | return 0; | |
1da177e4 LT |
304 | |
305 | data = hppfs->contents; | |
306 | off = *ppos; | |
1dd0dd11 | 307 | while (off >= sizeof(data->contents)) { |
1da177e4 LT |
308 | data = list_entry(data->list.next, struct hppfs_data, |
309 | list); | |
310 | off -= sizeof(data->contents); | |
311 | } | |
312 | ||
1dd0dd11 | 313 | if (off + count > hppfs->len) |
1da177e4 LT |
314 | count = hppfs->len - off; |
315 | copy_to_user(buf, &data->contents[off], count); | |
316 | *ppos += count; | |
1dd0dd11 | 317 | } else if (hppfs->host_fd != -1) { |
1da177e4 | 318 | err = os_seek_file(hppfs->host_fd, *ppos); |
1dd0dd11 DH |
319 | if (err) { |
320 | printk(KERN_ERR "hppfs_read : seek failed, " | |
321 | "errno = %d\n", err); | |
322 | return err; | |
1da177e4 LT |
323 | } |
324 | count = hppfs_read_file(hppfs->host_fd, buf, count); | |
1dd0dd11 | 325 | if (count > 0) |
1da177e4 LT |
326 | *ppos += count; |
327 | } | |
328 | else count = read_proc(hppfs->proc_file, buf, count, ppos, 1); | |
329 | ||
1dd0dd11 | 330 | return count; |
1da177e4 LT |
331 | } |
332 | ||
347f217c | 333 | static ssize_t hppfs_write(struct file *file, const char __user *buf, size_t len, |
1da177e4 LT |
334 | loff_t *ppos) |
335 | { | |
336 | struct hppfs_private *data = file->private_data; | |
337 | struct file *proc_file = data->proc_file; | |
347f217c | 338 | ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *); |
1da177e4 LT |
339 | int err; |
340 | ||
471b17e7 | 341 | write = proc_file->f_path.dentry->d_inode->i_fop->write; |
1da177e4 LT |
342 | |
343 | proc_file->f_pos = file->f_pos; | |
344 | err = (*write)(proc_file, buf, len, &proc_file->f_pos); | |
345 | file->f_pos = proc_file->f_pos; | |
346 | ||
1dd0dd11 | 347 | return err; |
1da177e4 LT |
348 | } |
349 | ||
350 | static int open_host_sock(char *host_file, int *filter_out) | |
351 | { | |
352 | char *end; | |
353 | int fd; | |
354 | ||
355 | end = &host_file[strlen(host_file)]; | |
356 | strcpy(end, "/rw"); | |
357 | *filter_out = 1; | |
358 | fd = os_connect_socket(host_file); | |
1dd0dd11 DH |
359 | if (fd > 0) |
360 | return fd; | |
1da177e4 LT |
361 | |
362 | strcpy(end, "/r"); | |
363 | *filter_out = 0; | |
364 | fd = os_connect_socket(host_file); | |
1dd0dd11 | 365 | return fd; |
1da177e4 LT |
366 | } |
367 | ||
368 | static void free_contents(struct hppfs_data *head) | |
369 | { | |
370 | struct hppfs_data *data; | |
371 | struct list_head *ele, *next; | |
372 | ||
1dd0dd11 DH |
373 | if (head == NULL) |
374 | return; | |
1da177e4 | 375 | |
1dd0dd11 | 376 | list_for_each_safe(ele, next, &head->list) { |
1da177e4 LT |
377 | data = list_entry(ele, struct hppfs_data, list); |
378 | kfree(data); | |
379 | } | |
380 | kfree(head); | |
381 | } | |
382 | ||
383 | static struct hppfs_data *hppfs_get_data(int fd, int filter, | |
384 | struct file *proc_file, | |
385 | struct file *hppfs_file, | |
386 | loff_t *size_out) | |
387 | { | |
388 | struct hppfs_data *data, *new, *head; | |
389 | int n, err; | |
390 | ||
391 | err = -ENOMEM; | |
392 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1dd0dd11 DH |
393 | if (data == NULL) { |
394 | printk(KERN_ERR "hppfs_get_data : head allocation failed\n"); | |
1da177e4 LT |
395 | goto failed; |
396 | } | |
397 | ||
398 | INIT_LIST_HEAD(&data->list); | |
399 | ||
400 | head = data; | |
401 | *size_out = 0; | |
402 | ||
1dd0dd11 DH |
403 | if (filter) { |
404 | while ((n = read_proc(proc_file, data->contents, | |
1da177e4 LT |
405 | sizeof(data->contents), NULL, 0)) > 0) |
406 | os_write_file(fd, data->contents, n); | |
407 | err = os_shutdown_socket(fd, 0, 1); | |
1dd0dd11 DH |
408 | if (err) { |
409 | printk(KERN_ERR "hppfs_get_data : failed to shut down " | |
1da177e4 LT |
410 | "socket\n"); |
411 | goto failed_free; | |
412 | } | |
413 | } | |
1dd0dd11 | 414 | while (1) { |
1da177e4 | 415 | n = os_read_file(fd, data->contents, sizeof(data->contents)); |
1dd0dd11 | 416 | if (n < 0) { |
1da177e4 | 417 | err = n; |
1dd0dd11 DH |
418 | printk(KERN_ERR "hppfs_get_data : read failed, " |
419 | "errno = %d\n", err); | |
1da177e4 | 420 | goto failed_free; |
1dd0dd11 | 421 | } else if (n == 0) |
1da177e4 LT |
422 | break; |
423 | ||
424 | *size_out += n; | |
425 | ||
1dd0dd11 | 426 | if (n < sizeof(data->contents)) |
1da177e4 LT |
427 | break; |
428 | ||
429 | new = kmalloc(sizeof(*data), GFP_KERNEL); | |
1dd0dd11 DH |
430 | if (new == 0) { |
431 | printk(KERN_ERR "hppfs_get_data : data allocation " | |
432 | "failed\n"); | |
1da177e4 LT |
433 | err = -ENOMEM; |
434 | goto failed_free; | |
435 | } | |
436 | ||
437 | INIT_LIST_HEAD(&new->list); | |
438 | list_add(&new->list, &data->list); | |
439 | data = new; | |
440 | } | |
1dd0dd11 | 441 | return head; |
1da177e4 LT |
442 | |
443 | failed_free: | |
444 | free_contents(head); | |
445 | failed: | |
1dd0dd11 | 446 | return ERR_PTR(err); |
1da177e4 LT |
447 | } |
448 | ||
449 | static struct hppfs_private *hppfs_data(void) | |
450 | { | |
451 | struct hppfs_private *data; | |
452 | ||
453 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1dd0dd11 DH |
454 | if (data == NULL) |
455 | return data; | |
1da177e4 LT |
456 | |
457 | *data = ((struct hppfs_private ) { .host_fd = -1, | |
458 | .len = -1, | |
459 | .contents = NULL } ); | |
1dd0dd11 | 460 | return data; |
1da177e4 LT |
461 | } |
462 | ||
463 | static int file_mode(int fmode) | |
464 | { | |
1dd0dd11 DH |
465 | if (fmode == (FMODE_READ | FMODE_WRITE)) |
466 | return O_RDWR; | |
467 | if (fmode == FMODE_READ) | |
468 | return O_RDONLY; | |
469 | if (fmode == FMODE_WRITE) | |
470 | return O_WRONLY; | |
471 | return 0; | |
1da177e4 LT |
472 | } |
473 | ||
474 | static int hppfs_open(struct inode *inode, struct file *file) | |
475 | { | |
476 | struct hppfs_private *data; | |
477 | struct dentry *proc_dentry; | |
1dd0dd11 | 478 | struct vfsmount *proc_mnt; |
1da177e4 LT |
479 | char *host_file; |
480 | int err, fd, type, filter; | |
481 | ||
482 | err = -ENOMEM; | |
483 | data = hppfs_data(); | |
1dd0dd11 | 484 | if (data == NULL) |
1da177e4 LT |
485 | goto out; |
486 | ||
471b17e7 | 487 | host_file = dentry_name(file->f_path.dentry, strlen("/rw")); |
1dd0dd11 | 488 | if (host_file == NULL) |
1da177e4 LT |
489 | goto out_free2; |
490 | ||
491 | proc_dentry = HPPFS_I(inode)->proc_dentry; | |
1dd0dd11 | 492 | proc_mnt = HPPFS_I(inode)->proc_mnt; |
1da177e4 LT |
493 | |
494 | /* XXX This isn't closed anywhere */ | |
1dd0dd11 | 495 | data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), |
1da177e4 LT |
496 | file_mode(file->f_mode)); |
497 | err = PTR_ERR(data->proc_file); | |
1dd0dd11 | 498 | if (IS_ERR(data->proc_file)) |
1da177e4 LT |
499 | goto out_free1; |
500 | ||
501 | type = os_file_type(host_file); | |
1dd0dd11 | 502 | if (type == OS_TYPE_FILE) { |
1da177e4 | 503 | fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); |
1dd0dd11 | 504 | if (fd >= 0) |
1da177e4 | 505 | data->host_fd = fd; |
1dd0dd11 DH |
506 | else |
507 | printk(KERN_ERR "hppfs_open : failed to open '%s', " | |
508 | "errno = %d\n", host_file, -fd); | |
1da177e4 LT |
509 | |
510 | data->contents = NULL; | |
1dd0dd11 | 511 | } else if (type == OS_TYPE_DIR) { |
1da177e4 | 512 | fd = open_host_sock(host_file, &filter); |
1dd0dd11 | 513 | if (fd > 0) { |
1da177e4 | 514 | data->contents = hppfs_get_data(fd, filter, |
3f580470 | 515 | data->proc_file, |
1da177e4 | 516 | file, &data->len); |
1dd0dd11 | 517 | if (!IS_ERR(data->contents)) |
1da177e4 | 518 | data->host_fd = fd; |
1dd0dd11 DH |
519 | } else |
520 | printk(KERN_ERR "hppfs_open : failed to open a socket " | |
521 | "in '%s', errno = %d\n", host_file, -fd); | |
1da177e4 LT |
522 | } |
523 | kfree(host_file); | |
524 | ||
525 | file->private_data = data; | |
1dd0dd11 | 526 | return 0; |
1da177e4 LT |
527 | |
528 | out_free1: | |
529 | kfree(host_file); | |
530 | out_free2: | |
531 | free_contents(data->contents); | |
532 | kfree(data); | |
533 | out: | |
1dd0dd11 | 534 | return err; |
1da177e4 LT |
535 | } |
536 | ||
537 | static int hppfs_dir_open(struct inode *inode, struct file *file) | |
538 | { | |
539 | struct hppfs_private *data; | |
540 | struct dentry *proc_dentry; | |
1dd0dd11 | 541 | struct vfsmount *proc_mnt; |
1da177e4 LT |
542 | int err; |
543 | ||
544 | err = -ENOMEM; | |
545 | data = hppfs_data(); | |
1dd0dd11 | 546 | if (data == NULL) |
1da177e4 LT |
547 | goto out; |
548 | ||
549 | proc_dentry = HPPFS_I(inode)->proc_dentry; | |
1dd0dd11 DH |
550 | proc_mnt = HPPFS_I(inode)->proc_mnt; |
551 | data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), | |
1da177e4 LT |
552 | file_mode(file->f_mode)); |
553 | err = PTR_ERR(data->proc_file); | |
1dd0dd11 | 554 | if (IS_ERR(data->proc_file)) |
1da177e4 LT |
555 | goto out_free; |
556 | ||
557 | file->private_data = data; | |
1dd0dd11 | 558 | return 0; |
1da177e4 LT |
559 | |
560 | out_free: | |
561 | kfree(data); | |
562 | out: | |
1dd0dd11 | 563 | return err; |
1da177e4 LT |
564 | } |
565 | ||
566 | static loff_t hppfs_llseek(struct file *file, loff_t off, int where) | |
567 | { | |
568 | struct hppfs_private *data = file->private_data; | |
3f580470 | 569 | struct file *proc_file = data->proc_file; |
1da177e4 LT |
570 | loff_t (*llseek)(struct file *, loff_t, int); |
571 | loff_t ret; | |
572 | ||
471b17e7 | 573 | llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek; |
1dd0dd11 | 574 | if (llseek != NULL) { |
1da177e4 | 575 | ret = (*llseek)(proc_file, off, where); |
1dd0dd11 DH |
576 | if (ret < 0) |
577 | return ret; | |
1da177e4 LT |
578 | } |
579 | ||
1dd0dd11 | 580 | return default_llseek(file, off, where); |
1da177e4 LT |
581 | } |
582 | ||
4b6f5d20 | 583 | static const struct file_operations hppfs_file_fops = { |
1da177e4 LT |
584 | .owner = NULL, |
585 | .llseek = hppfs_llseek, | |
586 | .read = hppfs_read, | |
587 | .write = hppfs_write, | |
588 | .open = hppfs_open, | |
589 | }; | |
590 | ||
591 | struct hppfs_dirent { | |
592 | void *vfs_dirent; | |
593 | filldir_t filldir; | |
594 | struct dentry *dentry; | |
595 | }; | |
596 | ||
597 | static int hppfs_filldir(void *d, const char *name, int size, | |
c8adf94a | 598 | loff_t offset, u64 inode, unsigned int type) |
1da177e4 LT |
599 | { |
600 | struct hppfs_dirent *dirent = d; | |
601 | ||
1dd0dd11 DH |
602 | if (file_removed(dirent->dentry, name)) |
603 | return 0; | |
1da177e4 | 604 | |
1dd0dd11 DH |
605 | return (*dirent->filldir)(dirent->vfs_dirent, name, size, offset, |
606 | inode, type); | |
1da177e4 LT |
607 | } |
608 | ||
609 | static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir) | |
610 | { | |
611 | struct hppfs_private *data = file->private_data; | |
3f580470 | 612 | struct file *proc_file = data->proc_file; |
1da177e4 LT |
613 | int (*readdir)(struct file *, void *, filldir_t); |
614 | struct hppfs_dirent dirent = ((struct hppfs_dirent) | |
615 | { .vfs_dirent = ent, | |
616 | .filldir = filldir, | |
1dd0dd11 DH |
617 | .dentry = file->f_path.dentry |
618 | }); | |
1da177e4 LT |
619 | int err; |
620 | ||
471b17e7 | 621 | readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir; |
1da177e4 LT |
622 | |
623 | proc_file->f_pos = file->f_pos; | |
624 | err = (*readdir)(proc_file, &dirent, hppfs_filldir); | |
625 | file->f_pos = proc_file->f_pos; | |
626 | ||
1dd0dd11 | 627 | return err; |
1da177e4 LT |
628 | } |
629 | ||
630 | static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
631 | { | |
1dd0dd11 | 632 | return 0; |
1da177e4 LT |
633 | } |
634 | ||
4b6f5d20 | 635 | static const struct file_operations hppfs_dir_fops = { |
1da177e4 LT |
636 | .owner = NULL, |
637 | .readdir = hppfs_readdir, | |
638 | .open = hppfs_dir_open, | |
639 | .fsync = hppfs_fsync, | |
640 | }; | |
641 | ||
726c3342 | 642 | static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf) |
1da177e4 LT |
643 | { |
644 | sf->f_blocks = 0; | |
645 | sf->f_bfree = 0; | |
646 | sf->f_bavail = 0; | |
647 | sf->f_files = 0; | |
648 | sf->f_ffree = 0; | |
649 | sf->f_type = HPPFS_SUPER_MAGIC; | |
1dd0dd11 | 650 | return 0; |
1da177e4 LT |
651 | } |
652 | ||
653 | static struct inode *hppfs_alloc_inode(struct super_block *sb) | |
654 | { | |
655 | struct hppfs_inode_info *hi; | |
656 | ||
657 | hi = kmalloc(sizeof(*hi), GFP_KERNEL); | |
1dd0dd11 DH |
658 | if (!hi) |
659 | return NULL; | |
1da177e4 | 660 | |
1dd0dd11 DH |
661 | hi->proc_dentry = NULL; |
662 | hi->proc_mnt = NULL; | |
1da177e4 | 663 | inode_init_once(&hi->vfs_inode); |
1dd0dd11 | 664 | return &hi->vfs_inode; |
1da177e4 LT |
665 | } |
666 | ||
667 | void hppfs_delete_inode(struct inode *ino) | |
668 | { | |
669 | clear_inode(ino); | |
670 | } | |
671 | ||
672 | static void hppfs_destroy_inode(struct inode *inode) | |
673 | { | |
674 | kfree(HPPFS_I(inode)); | |
675 | } | |
676 | ||
1dd0dd11 DH |
677 | static void hppfs_put_super(struct super_block *sb) |
678 | { | |
679 | mntput(HPPFS_I(sb->s_root->d_inode)->proc_mnt); | |
680 | } | |
681 | ||
ee9b6d61 | 682 | static const struct super_operations hppfs_sbops = { |
1da177e4 LT |
683 | .alloc_inode = hppfs_alloc_inode, |
684 | .destroy_inode = hppfs_destroy_inode, | |
1da177e4 LT |
685 | .delete_inode = hppfs_delete_inode, |
686 | .statfs = hppfs_statfs, | |
1dd0dd11 | 687 | .put_super = hppfs_put_super, |
1da177e4 LT |
688 | }; |
689 | ||
1dd0dd11 DH |
690 | static int hppfs_readlink(struct dentry *dentry, char __user *buffer, |
691 | int buflen) | |
1da177e4 LT |
692 | { |
693 | struct file *proc_file; | |
694 | struct dentry *proc_dentry; | |
1dd0dd11 | 695 | struct vfsmount *proc_mnt; |
fd589e0b | 696 | int ret; |
1da177e4 LT |
697 | |
698 | proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; | |
1dd0dd11 DH |
699 | proc_mnt = HPPFS_I(dentry->d_inode)->proc_mnt; |
700 | ||
701 | proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), O_RDONLY); | |
fd589e0b PBG |
702 | if (IS_ERR(proc_file)) |
703 | return PTR_ERR(proc_file); | |
1da177e4 | 704 | |
fd589e0b | 705 | ret = proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, buflen); |
1da177e4 LT |
706 | |
707 | fput(proc_file); | |
708 | ||
fd589e0b | 709 | return ret; |
1da177e4 LT |
710 | } |
711 | ||
d7a60d50 | 712 | static void* hppfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
713 | { |
714 | struct file *proc_file; | |
715 | struct dentry *proc_dentry; | |
1dd0dd11 | 716 | struct vfsmount *proc_mnt; |
d7a60d50 | 717 | void *ret; |
1da177e4 LT |
718 | |
719 | proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; | |
1dd0dd11 DH |
720 | proc_mnt = HPPFS_I(dentry->d_inode)->proc_mnt; |
721 | ||
722 | proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt), O_RDONLY); | |
fd589e0b PBG |
723 | if (IS_ERR(proc_file)) |
724 | return proc_file; | |
d7a60d50 | 725 | |
fd589e0b | 726 | ret = proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd); |
1da177e4 LT |
727 | |
728 | fput(proc_file); | |
729 | ||
d7a60d50 | 730 | return ret; |
1da177e4 LT |
731 | } |
732 | ||
92e1d5be | 733 | static const struct inode_operations hppfs_dir_iops = { |
1da177e4 LT |
734 | .lookup = hppfs_lookup, |
735 | }; | |
736 | ||
92e1d5be | 737 | static const struct inode_operations hppfs_link_iops = { |
1da177e4 LT |
738 | .readlink = hppfs_readlink, |
739 | .follow_link = hppfs_follow_link, | |
740 | }; | |
741 | ||
1dd0dd11 DH |
742 | static int init_inode(struct inode *inode, struct dentry *dentry, |
743 | struct vfsmount *mnt) | |
1da177e4 | 744 | { |
1dd0dd11 | 745 | if (S_ISDIR(dentry->d_inode->i_mode)) { |
1da177e4 LT |
746 | inode->i_op = &hppfs_dir_iops; |
747 | inode->i_fop = &hppfs_dir_fops; | |
1dd0dd11 | 748 | } else if (S_ISLNK(dentry->d_inode->i_mode)) { |
1da177e4 LT |
749 | inode->i_op = &hppfs_link_iops; |
750 | inode->i_fop = &hppfs_file_fops; | |
1dd0dd11 | 751 | } else { |
1da177e4 LT |
752 | inode->i_op = &hppfs_file_iops; |
753 | inode->i_fop = &hppfs_file_fops; | |
754 | } | |
755 | ||
756 | HPPFS_I(inode)->proc_dentry = dentry; | |
1dd0dd11 | 757 | HPPFS_I(inode)->proc_mnt = mnt; |
1da177e4 | 758 | |
1dd0dd11 | 759 | return 0; |
1da177e4 LT |
760 | } |
761 | ||
762 | static int hppfs_fill_super(struct super_block *sb, void *d, int silent) | |
763 | { | |
764 | struct inode *root_inode; | |
765 | struct file_system_type *procfs; | |
1dd0dd11 | 766 | struct vfsmount *proc_mnt; |
1da177e4 LT |
767 | int err; |
768 | ||
769 | err = -ENOENT; | |
770 | procfs = get_fs_type("proc"); | |
1dd0dd11 | 771 | if (!procfs) |
1da177e4 LT |
772 | goto out; |
773 | ||
1dd0dd11 DH |
774 | proc_mnt = vfs_kern_mount(procfs, 0, procfs->name, NULL); |
775 | put_filesystem(procfs); | |
776 | if (IS_ERR(proc_mnt)) | |
1da177e4 LT |
777 | goto out; |
778 | ||
1da177e4 LT |
779 | sb->s_blocksize = 1024; |
780 | sb->s_blocksize_bits = 10; | |
781 | sb->s_magic = HPPFS_SUPER_MAGIC; | |
782 | sb->s_op = &hppfs_sbops; | |
783 | ||
755aedc1 DH |
784 | root_inode = hppfs_iget(sb); |
785 | if (IS_ERR(root_inode)) { | |
786 | err = PTR_ERR(root_inode); | |
1da177e4 | 787 | goto out; |
755aedc1 | 788 | } |
1da177e4 | 789 | |
1dd0dd11 DH |
790 | err = init_inode(root_inode, proc_mnt->mnt_sb->s_root, proc_mnt); |
791 | if (err) | |
792 | goto out_iput; | |
1da177e4 LT |
793 | |
794 | err = -ENOMEM; | |
795 | sb->s_root = d_alloc_root(root_inode); | |
1dd0dd11 DH |
796 | if (!sb->s_root) |
797 | goto out_iput; | |
1da177e4 LT |
798 | |
799 | hppfs_read_inode(root_inode); | |
800 | ||
1dd0dd11 | 801 | return 0; |
1da177e4 | 802 | |
1dd0dd11 | 803 | out_iput: |
1da177e4 | 804 | iput(root_inode); |
1dd0dd11 DH |
805 | out_mntput: |
806 | mntput(proc_mnt); | |
1da177e4 LT |
807 | out: |
808 | return(err); | |
809 | } | |
810 | ||
454e2398 DH |
811 | static int hppfs_read_super(struct file_system_type *type, |
812 | int flags, const char *dev_name, | |
813 | void *data, struct vfsmount *mnt) | |
1da177e4 | 814 | { |
454e2398 | 815 | return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt); |
1da177e4 LT |
816 | } |
817 | ||
818 | static struct file_system_type hppfs_type = { | |
819 | .owner = THIS_MODULE, | |
820 | .name = "hppfs", | |
821 | .get_sb = hppfs_read_super, | |
822 | .kill_sb = kill_anon_super, | |
823 | .fs_flags = 0, | |
824 | }; | |
825 | ||
826 | static int __init init_hppfs(void) | |
827 | { | |
1dd0dd11 | 828 | return register_filesystem(&hppfs_type); |
1da177e4 LT |
829 | } |
830 | ||
831 | static void __exit exit_hppfs(void) | |
832 | { | |
833 | unregister_filesystem(&hppfs_type); | |
834 | } | |
835 | ||
836 | module_init(init_hppfs) | |
837 | module_exit(exit_hppfs) | |
838 | MODULE_LICENSE("GPL"); |