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mac80211: mesh data structures and first mesh changes
[linux-2.6/sactl.git] / fs / hppfs / hppfs_kern.c
bloba1e1f0f61aa5b750971cc81f7369541ed95c0ad0
1 /*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6 #include <linux/fs.h>
7 #include <linux/file.h>
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 {
41 return container_of(inode, struct hppfs_inode_info, vfs_inode);
42 }
43
44 #define HPPFS_SUPER_MAGIC 0xb00000ee
45
46 static const 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_blocks = proc_ino->i_blocks;
156 }
157
158 static struct inode *hppfs_iget(struct super_block *sb)
159 {
160 struct inode *inode;
161
162 inode = iget_locked(sb, 0);
163 if (!inode)
164 return ERR_PTR(-ENOMEM);
165 if (inode->i_state & I_NEW) {
166 hppfs_read_inode(inode);
167 unlock_new_inode(inode);
168 }
169 return inode;
170 }
171
172 static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
173 struct nameidata *nd)
174 {
175 struct dentry *proc_dentry, *new, *parent;
176 struct inode *inode;
177 int err, deleted;
178
179 deleted = file_removed(dentry, NULL);
180 if(deleted < 0)
181 return(ERR_PTR(deleted));
182 else if(deleted)
183 return(ERR_PTR(-ENOENT));
184
185 err = -ENOMEM;
186 parent = HPPFS_I(ino)->proc_dentry;
187 mutex_lock(&parent->d_inode->i_mutex);
188 proc_dentry = d_lookup(parent, &dentry->d_name);
189 if(proc_dentry == NULL){
190 proc_dentry = d_alloc(parent, &dentry->d_name);
191 if(proc_dentry == NULL){
192 mutex_unlock(&parent->d_inode->i_mutex);
193 goto out;
194 }
195 new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
196 proc_dentry, NULL);
197 if(new){
198 dput(proc_dentry);
199 proc_dentry = new;
200 }
201 }
202 mutex_unlock(&parent->d_inode->i_mutex);
203
204 if(IS_ERR(proc_dentry))
205 return(proc_dentry);
206
207 inode = hppfs_iget(ino->i_sb);
208 if (IS_ERR(inode)) {
209 err = PTR_ERR(inode);
210 goto out_dput;
211 }
212
213 err = init_inode(inode, proc_dentry);
214 if(err)
215 goto out_put;
216
217 hppfs_read_inode(inode);
218
219 d_add(dentry, inode);
220 dentry->d_op = &hppfs_dentry_ops;
221 return(NULL);
222
223 out_put:
224 iput(inode);
225 out_dput:
226 dput(proc_dentry);
227 out:
228 return(ERR_PTR(err));
229 }
230
231 static const struct inode_operations hppfs_file_iops = {
232 };
233
234 static ssize_t read_proc(struct file *file, char __user *buf, ssize_t count,
235 loff_t *ppos, int is_user)
236 {
237 ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
238 ssize_t n;
239
240 read = file->f_path.dentry->d_inode->i_fop->read;
241
242 if(!is_user)
243 set_fs(KERNEL_DS);
244
245 n = (*read)(file, buf, count, &file->f_pos);
246
247 if(!is_user)
248 set_fs(USER_DS);
249
250 if(ppos) *ppos = file->f_pos;
251 return n;
252 }
253
254 static ssize_t hppfs_read_file(int fd, char __user *buf, ssize_t count)
255 {
256 ssize_t n;
257 int cur, err;
258 char *new_buf;
259
260 n = -ENOMEM;
261 new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
262 if(new_buf == NULL){
263 printk("hppfs_read_file : kmalloc failed\n");
264 goto out;
265 }
266 n = 0;
267 while(count > 0){
268 cur = min_t(ssize_t, count, PAGE_SIZE);
269 err = os_read_file(fd, new_buf, cur);
270 if(err < 0){
271 printk("hppfs_read : read failed, errno = %d\n",
272 err);
273 n = err;
274 goto out_free;
275 }
276 else if(err == 0)
277 break;
278
279 if(copy_to_user(buf, new_buf, err)){
280 n = -EFAULT;
281 goto out_free;
282 }
283 n += err;
284 count -= err;
285 }
286 out_free:
287 kfree(new_buf);
288 out:
289 return n;
290 }
291
292 static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
293 loff_t *ppos)
294 {
295 struct hppfs_private *hppfs = file->private_data;
296 struct hppfs_data *data;
297 loff_t off;
298 int err;
299
300 if(hppfs->contents != NULL){
301 if(*ppos >= hppfs->len) return(0);
302
303 data = hppfs->contents;
304 off = *ppos;
305 while(off >= sizeof(data->contents)){
306 data = list_entry(data->list.next, struct hppfs_data,
307 list);
308 off -= sizeof(data->contents);
309 }
310
311 if(off + count > hppfs->len)
312 count = hppfs->len - off;
313 copy_to_user(buf, &data->contents[off], count);
314 *ppos += count;
315 }
316 else if(hppfs->host_fd != -1){
317 err = os_seek_file(hppfs->host_fd, *ppos);
318 if(err){
319 printk("hppfs_read : seek failed, errno = %d\n", err);
320 return(err);
321 }
322 count = hppfs_read_file(hppfs->host_fd, buf, count);
323 if(count > 0)
324 *ppos += count;
325 }
326 else count = read_proc(hppfs->proc_file, buf, count, ppos, 1);
327
328 return(count);
329 }
330
331 static ssize_t hppfs_write(struct file *file, const char __user *buf, size_t len,
332 loff_t *ppos)
333 {
334 struct hppfs_private *data = file->private_data;
335 struct file *proc_file = data->proc_file;
336 ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
337 int err;
338
339 write = proc_file->f_path.dentry->d_inode->i_fop->write;
340
341 proc_file->f_pos = file->f_pos;
342 err = (*write)(proc_file, buf, len, &proc_file->f_pos);
343 file->f_pos = proc_file->f_pos;
344
345 return(err);
346 }
347
348 static int open_host_sock(char *host_file, int *filter_out)
349 {
350 char *end;
351 int fd;
352
353 end = &host_file[strlen(host_file)];
354 strcpy(end, "/rw");
355 *filter_out = 1;
356 fd = os_connect_socket(host_file);
357 if(fd > 0)
358 return(fd);
359
360 strcpy(end, "/r");
361 *filter_out = 0;
362 fd = os_connect_socket(host_file);
363 return(fd);
364 }
365
366 static void free_contents(struct hppfs_data *head)
367 {
368 struct hppfs_data *data;
369 struct list_head *ele, *next;
370
371 if(head == NULL) return;
372
373 list_for_each_safe(ele, next, &head->list){
374 data = list_entry(ele, struct hppfs_data, list);
375 kfree(data);
376 }
377 kfree(head);
378 }
379
380 static struct hppfs_data *hppfs_get_data(int fd, int filter,
381 struct file *proc_file,
382 struct file *hppfs_file,
383 loff_t *size_out)
384 {
385 struct hppfs_data *data, *new, *head;
386 int n, err;
387
388 err = -ENOMEM;
389 data = kmalloc(sizeof(*data), GFP_KERNEL);
390 if(data == NULL){
391 printk("hppfs_get_data : head allocation failed\n");
392 goto failed;
393 }
394
395 INIT_LIST_HEAD(&data->list);
396
397 head = data;
398 *size_out = 0;
399
400 if(filter){
401 while((n = read_proc(proc_file, data->contents,
402 sizeof(data->contents), NULL, 0)) > 0)
403 os_write_file(fd, data->contents, n);
404 err = os_shutdown_socket(fd, 0, 1);
405 if(err){
406 printk("hppfs_get_data : failed to shut down "
407 "socket\n");
408 goto failed_free;
409 }
410 }
411 while(1){
412 n = os_read_file(fd, data->contents, sizeof(data->contents));
413 if(n < 0){
414 err = n;
415 printk("hppfs_get_data : read failed, errno = %d\n",
416 err);
417 goto failed_free;
418 }
419 else if(n == 0)
420 break;
421
422 *size_out += n;
423
424 if(n < sizeof(data->contents))
425 break;
426
427 new = kmalloc(sizeof(*data), GFP_KERNEL);
428 if(new == 0){
429 printk("hppfs_get_data : data allocation failed\n");
430 err = -ENOMEM;
431 goto failed_free;
432 }
433
434 INIT_LIST_HEAD(&new->list);
435 list_add(&new->list, &data->list);
436 data = new;
437 }
438 return(head);
439
440 failed_free:
441 free_contents(head);
442 failed:
443 return(ERR_PTR(err));
444 }
445
446 static struct hppfs_private *hppfs_data(void)
447 {
448 struct hppfs_private *data;
449
450 data = kmalloc(sizeof(*data), GFP_KERNEL);
451 if(data == NULL)
452 return(data);
453
454 *data = ((struct hppfs_private ) { .host_fd = -1,
455 .len = -1,
456 .contents = NULL } );
457 return(data);
458 }
459
460 static int file_mode(int fmode)
461 {
462 if(fmode == (FMODE_READ | FMODE_WRITE))
463 return(O_RDWR);
464 if(fmode == FMODE_READ)
465 return(O_RDONLY);
466 if(fmode == FMODE_WRITE)
467 return(O_WRONLY);
468 return(0);
469 }
470
471 static int hppfs_open(struct inode *inode, struct file *file)
472 {
473 struct hppfs_private *data;
474 struct dentry *proc_dentry;
475 char *host_file;
476 int err, fd, type, filter;
477
478 err = -ENOMEM;
479 data = hppfs_data();
480 if(data == NULL)
481 goto out;
482
483 host_file = dentry_name(file->f_path.dentry, strlen("/rw"));
484 if(host_file == NULL)
485 goto out_free2;
486
487 proc_dentry = HPPFS_I(inode)->proc_dentry;
488
489 /* XXX This isn't closed anywhere */
490 data->proc_file = dentry_open(dget(proc_dentry), NULL,
491 file_mode(file->f_mode));
492 err = PTR_ERR(data->proc_file);
493 if(IS_ERR(data->proc_file))
494 goto out_free1;
495
496 type = os_file_type(host_file);
497 if(type == OS_TYPE_FILE){
498 fd = os_open_file(host_file, of_read(OPENFLAGS()), 0);
499 if(fd >= 0)
500 data->host_fd = fd;
501 else printk("hppfs_open : failed to open '%s', errno = %d\n",
502 host_file, -fd);
503
504 data->contents = NULL;
505 }
506 else if(type == OS_TYPE_DIR){
507 fd = open_host_sock(host_file, &filter);
508 if(fd > 0){
509 data->contents = hppfs_get_data(fd, filter,
510 data->proc_file,
511 file, &data->len);
512 if(!IS_ERR(data->contents))
513 data->host_fd = fd;
514 }
515 else printk("hppfs_open : failed to open a socket in "
516 "'%s', errno = %d\n", host_file, -fd);
517 }
518 kfree(host_file);
519
520 file->private_data = data;
521 return(0);
522
523 out_free1:
524 kfree(host_file);
525 out_free2:
526 free_contents(data->contents);
527 kfree(data);
528 out:
529 return(err);
530 }
531
532 static int hppfs_dir_open(struct inode *inode, struct file *file)
533 {
534 struct hppfs_private *data;
535 struct dentry *proc_dentry;
536 int err;
537
538 err = -ENOMEM;
539 data = hppfs_data();
540 if(data == NULL)
541 goto out;
542
543 proc_dentry = HPPFS_I(inode)->proc_dentry;
544 data->proc_file = dentry_open(dget(proc_dentry), NULL,
545 file_mode(file->f_mode));
546 err = PTR_ERR(data->proc_file);
547 if(IS_ERR(data->proc_file))
548 goto out_free;
549
550 file->private_data = data;
551 return(0);
552
553 out_free:
554 kfree(data);
555 out:
556 return(err);
557 }
558
559 static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
560 {
561 struct hppfs_private *data = file->private_data;
562 struct file *proc_file = data->proc_file;
563 loff_t (*llseek)(struct file *, loff_t, int);
564 loff_t ret;
565
566 llseek = proc_file->f_path.dentry->d_inode->i_fop->llseek;
567 if(llseek != NULL){
568 ret = (*llseek)(proc_file, off, where);
569 if(ret < 0)
570 return(ret);
571 }
572
573 return(default_llseek(file, off, where));
574 }
575
576 static const struct file_operations hppfs_file_fops = {
577 .owner = NULL,
578 .llseek = hppfs_llseek,
579 .read = hppfs_read,
580 .write = hppfs_write,
581 .open = hppfs_open,
582 };
583
584 struct hppfs_dirent {
585 void *vfs_dirent;
586 filldir_t filldir;
587 struct dentry *dentry;
588 };
589
590 static int hppfs_filldir(void *d, const char *name, int size,
591 loff_t offset, u64 inode, unsigned int type)
592 {
593 struct hppfs_dirent *dirent = d;
594
595 if(file_removed(dirent->dentry, name))
596 return(0);
597
598 return((*dirent->filldir)(dirent->vfs_dirent, name, size, offset,
599 inode, type));
600 }
601
602 static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir)
603 {
604 struct hppfs_private *data = file->private_data;
605 struct file *proc_file = data->proc_file;
606 int (*readdir)(struct file *, void *, filldir_t);
607 struct hppfs_dirent dirent = ((struct hppfs_dirent)
608 { .vfs_dirent = ent,
609 .filldir = filldir,
610 .dentry = file->f_path.dentry } );
611 int err;
612
613 readdir = proc_file->f_path.dentry->d_inode->i_fop->readdir;
614
615 proc_file->f_pos = file->f_pos;
616 err = (*readdir)(proc_file, &dirent, hppfs_filldir);
617 file->f_pos = proc_file->f_pos;
618
619 return(err);
620 }
621
622 static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync)
623 {
624 return(0);
625 }
626
627 static const struct file_operations hppfs_dir_fops = {
628 .owner = NULL,
629 .readdir = hppfs_readdir,
630 .open = hppfs_dir_open,
631 .fsync = hppfs_fsync,
632 };
633
634 static int hppfs_statfs(struct dentry *dentry, struct kstatfs *sf)
635 {
636 sf->f_blocks = 0;
637 sf->f_bfree = 0;
638 sf->f_bavail = 0;
639 sf->f_files = 0;
640 sf->f_ffree = 0;
641 sf->f_type = HPPFS_SUPER_MAGIC;
642 return(0);
643 }
644
645 static struct inode *hppfs_alloc_inode(struct super_block *sb)
646 {
647 struct hppfs_inode_info *hi;
648
649 hi = kmalloc(sizeof(*hi), GFP_KERNEL);
650 if(hi == NULL)
651 return(NULL);
652
653 *hi = ((struct hppfs_inode_info) { .proc_dentry = NULL });
654 inode_init_once(&hi->vfs_inode);
655 return(&hi->vfs_inode);
656 }
657
658 void hppfs_delete_inode(struct inode *ino)
659 {
660 clear_inode(ino);
661 }
662
663 static void hppfs_destroy_inode(struct inode *inode)
664 {
665 kfree(HPPFS_I(inode));
666 }
667
668 static const struct super_operations hppfs_sbops = {
669 .alloc_inode = hppfs_alloc_inode,
670 .destroy_inode = hppfs_destroy_inode,
671 .delete_inode = hppfs_delete_inode,
672 .statfs = hppfs_statfs,
673 };
674
675 static int hppfs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
676 {
677 struct file *proc_file;
678 struct dentry *proc_dentry;
679 int ret;
680
681 proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
682 proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY);
683 if (IS_ERR(proc_file))
684 return PTR_ERR(proc_file);
685
686 ret = proc_dentry->d_inode->i_op->readlink(proc_dentry, buffer, buflen);
687
688 fput(proc_file);
689
690 return ret;
691 }
692
693 static void* hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
694 {
695 struct file *proc_file;
696 struct dentry *proc_dentry;
697 void *ret;
698
699 proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry;
700 proc_file = dentry_open(dget(proc_dentry), NULL, O_RDONLY);
701 if (IS_ERR(proc_file))
702 return proc_file;
703
704 ret = proc_dentry->d_inode->i_op->follow_link(proc_dentry, nd);
705
706 fput(proc_file);
707
708 return ret;
709 }
710
711 static const struct inode_operations hppfs_dir_iops = {
712 .lookup = hppfs_lookup,
713 };
714
715 static const struct inode_operations hppfs_link_iops = {
716 .readlink = hppfs_readlink,
717 .follow_link = hppfs_follow_link,
718 };
719
720 static int init_inode(struct inode *inode, struct dentry *dentry)
721 {
722 if(S_ISDIR(dentry->d_inode->i_mode)){
723 inode->i_op = &hppfs_dir_iops;
724 inode->i_fop = &hppfs_dir_fops;
725 }
726 else if(S_ISLNK(dentry->d_inode->i_mode)){
727 inode->i_op = &hppfs_link_iops;
728 inode->i_fop = &hppfs_file_fops;
729 }
730 else {
731 inode->i_op = &hppfs_file_iops;
732 inode->i_fop = &hppfs_file_fops;
733 }
734
735 HPPFS_I(inode)->proc_dentry = dentry;
736
737 return(0);
738 }
739
740 static int hppfs_fill_super(struct super_block *sb, void *d, int silent)
741 {
742 struct inode *root_inode;
743 struct file_system_type *procfs;
744 struct super_block *proc_sb;
745 int err;
746
747 err = -ENOENT;
748 procfs = get_fs_type("proc");
749 if(procfs == NULL)
750 goto out;
751
752 if(list_empty(&procfs->fs_supers))
753 goto out;
754
755 proc_sb = list_entry(procfs->fs_supers.next, struct super_block,
756 s_instances);
757
758 sb->s_blocksize = 1024;
759 sb->s_blocksize_bits = 10;
760 sb->s_magic = HPPFS_SUPER_MAGIC;
761 sb->s_op = &hppfs_sbops;
762
763 root_inode = hppfs_iget(sb);
764 if (IS_ERR(root_inode)) {
765 err = PTR_ERR(root_inode);
766 goto out;
767 }
768
769 err = init_inode(root_inode, proc_sb->s_root);
770 if(err)
771 goto out_put;
772
773 err = -ENOMEM;
774 sb->s_root = d_alloc_root(root_inode);
775 if(sb->s_root == NULL)
776 goto out_put;
777
778 hppfs_read_inode(root_inode);
779
780 return(0);
781
782 out_put:
783 iput(root_inode);
784 out:
785 return(err);
786 }
787
788 static int hppfs_read_super(struct file_system_type *type,
789 int flags, const char *dev_name,
790 void *data, struct vfsmount *mnt)
791 {
792 return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt);
793 }
794
795 static struct file_system_type hppfs_type = {
796 .owner = THIS_MODULE,
797 .name = "hppfs",
798 .get_sb = hppfs_read_super,
799 .kill_sb = kill_anon_super,
800 .fs_flags = 0,
801 };
802
803 static int __init init_hppfs(void)
804 {
805 return(register_filesystem(&hppfs_type));
806 }
807
808 static void __exit exit_hppfs(void)
809 {
810 unregister_filesystem(&hppfs_type);
811 }
812
813 module_init(init_hppfs)
814 module_exit(exit_hppfs)
815 MODULE_LICENSE("GPL");
816
817 /*
818 * Overrides for Emacs so that we follow Linus's tabbing style.
819 * Emacs will notice this stuff at the end of the file and automatically
820 * adjust the settings for this buffer only. This must remain at the end
821 * of the file.
822 * ---------------------------------------------------------------------------
823 * Local variables:
824 * c-file-style: "linux"
825 * End:
826 */
SocketAccessConTroL development