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