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Linux/fs/afs/proc.c

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  1 /* /proc interface for AFS
  2  *
  3  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/slab.h>
 13 #include <linux/module.h>
 14 #include <linux/proc_fs.h>
 15 #include <linux/seq_file.h>
 16 #include <linux/sched.h>
 17 #include <asm/uaccess.h>
 18 #include "internal.h"
 19 
 20 static struct proc_dir_entry *proc_afs;
 21 
 22 
 23 static int afs_proc_cells_open(struct inode *inode, struct file *file);
 24 static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
 25 static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
 26 static void afs_proc_cells_stop(struct seq_file *p, void *v);
 27 static int afs_proc_cells_show(struct seq_file *m, void *v);
 28 static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
 29                                     size_t size, loff_t *_pos);
 30 
 31 static const struct seq_operations afs_proc_cells_ops = {
 32         .start  = afs_proc_cells_start,
 33         .next   = afs_proc_cells_next,
 34         .stop   = afs_proc_cells_stop,
 35         .show   = afs_proc_cells_show,
 36 };
 37 
 38 static const struct file_operations afs_proc_cells_fops = {
 39         .open           = afs_proc_cells_open,
 40         .read           = seq_read,
 41         .write          = afs_proc_cells_write,
 42         .llseek         = seq_lseek,
 43         .release        = seq_release,
 44         .owner          = THIS_MODULE,
 45 };
 46 
 47 static int afs_proc_rootcell_open(struct inode *inode, struct file *file);
 48 static int afs_proc_rootcell_release(struct inode *inode, struct file *file);
 49 static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
 50                                       size_t size, loff_t *_pos);
 51 static ssize_t afs_proc_rootcell_write(struct file *file,
 52                                        const char __user *buf,
 53                                        size_t size, loff_t *_pos);
 54 
 55 static const struct file_operations afs_proc_rootcell_fops = {
 56         .open           = afs_proc_rootcell_open,
 57         .read           = afs_proc_rootcell_read,
 58         .write          = afs_proc_rootcell_write,
 59         .llseek         = no_llseek,
 60         .release        = afs_proc_rootcell_release,
 61         .owner          = THIS_MODULE,
 62 };
 63 
 64 static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
 65 static int afs_proc_cell_volumes_release(struct inode *inode,
 66                                          struct file *file);
 67 static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
 68 static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
 69                                         loff_t *pos);
 70 static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
 71 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
 72 
 73 static const struct seq_operations afs_proc_cell_volumes_ops = {
 74         .start  = afs_proc_cell_volumes_start,
 75         .next   = afs_proc_cell_volumes_next,
 76         .stop   = afs_proc_cell_volumes_stop,
 77         .show   = afs_proc_cell_volumes_show,
 78 };
 79 
 80 static const struct file_operations afs_proc_cell_volumes_fops = {
 81         .open           = afs_proc_cell_volumes_open,
 82         .read           = seq_read,
 83         .llseek         = seq_lseek,
 84         .release        = afs_proc_cell_volumes_release,
 85         .owner          = THIS_MODULE,
 86 };
 87 
 88 static int afs_proc_cell_vlservers_open(struct inode *inode,
 89                                         struct file *file);
 90 static int afs_proc_cell_vlservers_release(struct inode *inode,
 91                                            struct file *file);
 92 static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
 93 static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
 94                                           loff_t *pos);
 95 static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
 96 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
 97 
 98 static const struct seq_operations afs_proc_cell_vlservers_ops = {
 99         .start  = afs_proc_cell_vlservers_start,
100         .next   = afs_proc_cell_vlservers_next,
101         .stop   = afs_proc_cell_vlservers_stop,
102         .show   = afs_proc_cell_vlservers_show,
103 };
104 
105 static const struct file_operations afs_proc_cell_vlservers_fops = {
106         .open           = afs_proc_cell_vlservers_open,
107         .read           = seq_read,
108         .llseek         = seq_lseek,
109         .release        = afs_proc_cell_vlservers_release,
110         .owner          = THIS_MODULE,
111 };
112 
113 static int afs_proc_cell_servers_open(struct inode *inode, struct file *file);
114 static int afs_proc_cell_servers_release(struct inode *inode,
115                                          struct file *file);
116 static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos);
117 static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
118                                         loff_t *pos);
119 static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
120 static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
121 
122 static const struct seq_operations afs_proc_cell_servers_ops = {
123         .start  = afs_proc_cell_servers_start,
124         .next   = afs_proc_cell_servers_next,
125         .stop   = afs_proc_cell_servers_stop,
126         .show   = afs_proc_cell_servers_show,
127 };
128 
129 static const struct file_operations afs_proc_cell_servers_fops = {
130         .open           = afs_proc_cell_servers_open,
131         .read           = seq_read,
132         .llseek         = seq_lseek,
133         .release        = afs_proc_cell_servers_release,
134         .owner          = THIS_MODULE,
135 };
136 
137 /*
138  * initialise the /proc/fs/afs/ directory
139  */
140 int afs_proc_init(void)
141 {
142         struct proc_dir_entry *p;
143 
144         _enter("");
145 
146         proc_afs = proc_mkdir("fs/afs", NULL);
147         if (!proc_afs)
148                 goto error_dir;
149 
150         p = proc_create("cells", 0, proc_afs, &afs_proc_cells_fops);
151         if (!p)
152                 goto error_cells;
153 
154         p = proc_create("rootcell", 0, proc_afs, &afs_proc_rootcell_fops);
155         if (!p)
156                 goto error_rootcell;
157 
158         _leave(" = 0");
159         return 0;
160 
161 error_rootcell:
162         remove_proc_entry("cells", proc_afs);
163 error_cells:
164         remove_proc_entry("fs/afs", NULL);
165 error_dir:
166         _leave(" = -ENOMEM");
167         return -ENOMEM;
168 }
169 
170 /*
171  * clean up the /proc/fs/afs/ directory
172  */
173 void afs_proc_cleanup(void)
174 {
175         remove_proc_entry("rootcell", proc_afs);
176         remove_proc_entry("cells", proc_afs);
177         remove_proc_entry("fs/afs", NULL);
178 }
179 
180 /*
181  * open "/proc/fs/afs/cells" which provides a summary of extant cells
182  */
183 static int afs_proc_cells_open(struct inode *inode, struct file *file)
184 {
185         struct seq_file *m;
186         int ret;
187 
188         ret = seq_open(file, &afs_proc_cells_ops);
189         if (ret < 0)
190                 return ret;
191 
192         m = file->private_data;
193         m->private = PDE_DATA(inode);
194 
195         return 0;
196 }
197 
198 /*
199  * set up the iterator to start reading from the cells list and return the
200  * first item
201  */
202 static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
203 {
204         /* lock the list against modification */
205         down_read(&afs_proc_cells_sem);
206         return seq_list_start_head(&afs_proc_cells, *_pos);
207 }
208 
209 /*
210  * move to next cell in cells list
211  */
212 static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos)
213 {
214         return seq_list_next(v, &afs_proc_cells, pos);
215 }
216 
217 /*
218  * clean up after reading from the cells list
219  */
220 static void afs_proc_cells_stop(struct seq_file *p, void *v)
221 {
222         up_read(&afs_proc_cells_sem);
223 }
224 
225 /*
226  * display a header line followed by a load of cell lines
227  */
228 static int afs_proc_cells_show(struct seq_file *m, void *v)
229 {
230         struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
231 
232         if (v == &afs_proc_cells) {
233                 /* display header on line 1 */
234                 seq_puts(m, "USE NAME\n");
235                 return 0;
236         }
237 
238         /* display one cell per line on subsequent lines */
239         seq_printf(m, "%3d %s\n",
240                    atomic_read(&cell->usage), cell->name);
241         return 0;
242 }
243 
244 /*
245  * handle writes to /proc/fs/afs/cells
246  * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
247  */
248 static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
249                                     size_t size, loff_t *_pos)
250 {
251         char *kbuf, *name, *args;
252         int ret;
253 
254         /* start by dragging the command into memory */
255         if (size <= 1 || size >= PAGE_SIZE)
256                 return -EINVAL;
257 
258         kbuf = kmalloc(size + 1, GFP_KERNEL);
259         if (!kbuf)
260                 return -ENOMEM;
261 
262         ret = -EFAULT;
263         if (copy_from_user(kbuf, buf, size) != 0)
264                 goto done;
265         kbuf[size] = 0;
266 
267         /* trim to first NL */
268         name = memchr(kbuf, '\n', size);
269         if (name)
270                 *name = 0;
271 
272         /* split into command, name and argslist */
273         name = strchr(kbuf, ' ');
274         if (!name)
275                 goto inval;
276         do {
277                 *name++ = 0;
278         } while(*name == ' ');
279         if (!*name)
280                 goto inval;
281 
282         args = strchr(name, ' ');
283         if (!args)
284                 goto inval;
285         do {
286                 *args++ = 0;
287         } while(*args == ' ');
288         if (!*args)
289                 goto inval;
290 
291         /* determine command to perform */
292         _debug("cmd=%s name=%s args=%s", kbuf, name, args);
293 
294         if (strcmp(kbuf, "add") == 0) {
295                 struct afs_cell *cell;
296 
297                 cell = afs_cell_create(name, strlen(name), args, false);
298                 if (IS_ERR(cell)) {
299                         ret = PTR_ERR(cell);
300                         goto done;
301                 }
302 
303                 afs_put_cell(cell);
304                 printk("kAFS: Added new cell '%s'\n", name);
305         } else {
306                 goto inval;
307         }
308 
309         ret = size;
310 
311 done:
312         kfree(kbuf);
313         _leave(" = %d", ret);
314         return ret;
315 
316 inval:
317         ret = -EINVAL;
318         printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
319         goto done;
320 }
321 
322 /*
323  * Stubs for /proc/fs/afs/rootcell
324  */
325 static int afs_proc_rootcell_open(struct inode *inode, struct file *file)
326 {
327         return 0;
328 }
329 
330 static int afs_proc_rootcell_release(struct inode *inode, struct file *file)
331 {
332         return 0;
333 }
334 
335 static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
336                                       size_t size, loff_t *_pos)
337 {
338         return 0;
339 }
340 
341 /*
342  * handle writes to /proc/fs/afs/rootcell
343  * - to initialize rootcell: echo "cell.name:192.168.231.14"
344  */
345 static ssize_t afs_proc_rootcell_write(struct file *file,
346                                        const char __user *buf,
347                                        size_t size, loff_t *_pos)
348 {
349         char *kbuf, *s;
350         int ret;
351 
352         /* start by dragging the command into memory */
353         if (size <= 1 || size >= PAGE_SIZE)
354                 return -EINVAL;
355 
356         ret = -ENOMEM;
357         kbuf = kmalloc(size + 1, GFP_KERNEL);
358         if (!kbuf)
359                 goto nomem;
360 
361         ret = -EFAULT;
362         if (copy_from_user(kbuf, buf, size) != 0)
363                 goto infault;
364         kbuf[size] = 0;
365 
366         /* trim to first NL */
367         s = memchr(kbuf, '\n', size);
368         if (s)
369                 *s = 0;
370 
371         /* determine command to perform */
372         _debug("rootcell=%s", kbuf);
373 
374         ret = afs_cell_init(kbuf);
375         if (ret >= 0)
376                 ret = size;     /* consume everything, always */
377 
378 infault:
379         kfree(kbuf);
380 nomem:
381         _leave(" = %d", ret);
382         return ret;
383 }
384 
385 /*
386  * initialise /proc/fs/afs/<cell>/
387  */
388 int afs_proc_cell_setup(struct afs_cell *cell)
389 {
390         struct proc_dir_entry *p;
391 
392         _enter("%p{%s}", cell, cell->name);
393 
394         cell->proc_dir = proc_mkdir(cell->name, proc_afs);
395         if (!cell->proc_dir)
396                 goto error_dir;
397 
398         p = proc_create_data("servers", 0, cell->proc_dir,
399                              &afs_proc_cell_servers_fops, cell);
400         if (!p)
401                 goto error_servers;
402 
403         p = proc_create_data("vlservers", 0, cell->proc_dir,
404                              &afs_proc_cell_vlservers_fops, cell);
405         if (!p)
406                 goto error_vlservers;
407 
408         p = proc_create_data("volumes", 0, cell->proc_dir,
409                              &afs_proc_cell_volumes_fops, cell);
410         if (!p)
411                 goto error_volumes;
412 
413         _leave(" = 0");
414         return 0;
415 
416 error_volumes:
417         remove_proc_entry("vlservers", cell->proc_dir);
418 error_vlservers:
419         remove_proc_entry("servers", cell->proc_dir);
420 error_servers:
421         remove_proc_entry(cell->name, proc_afs);
422 error_dir:
423         _leave(" = -ENOMEM");
424         return -ENOMEM;
425 }
426 
427 /*
428  * remove /proc/fs/afs/<cell>/
429  */
430 void afs_proc_cell_remove(struct afs_cell *cell)
431 {
432         _enter("");
433 
434         remove_proc_entry("volumes", cell->proc_dir);
435         remove_proc_entry("vlservers", cell->proc_dir);
436         remove_proc_entry("servers", cell->proc_dir);
437         remove_proc_entry(cell->name, proc_afs);
438 
439         _leave("");
440 }
441 
442 /*
443  * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
444  */
445 static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
446 {
447         struct afs_cell *cell;
448         struct seq_file *m;
449         int ret;
450 
451         cell = PDE_DATA(inode);
452         if (!cell)
453                 return -ENOENT;
454 
455         ret = seq_open(file, &afs_proc_cell_volumes_ops);
456         if (ret < 0)
457                 return ret;
458 
459         m = file->private_data;
460         m->private = cell;
461 
462         return 0;
463 }
464 
465 /*
466  * close the file and release the ref to the cell
467  */
468 static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file)
469 {
470         return seq_release(inode, file);
471 }
472 
473 /*
474  * set up the iterator to start reading from the cells list and return the
475  * first item
476  */
477 static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
478 {
479         struct afs_cell *cell = m->private;
480 
481         _enter("cell=%p pos=%Ld", cell, *_pos);
482 
483         /* lock the list against modification */
484         down_read(&cell->vl_sem);
485         return seq_list_start_head(&cell->vl_list, *_pos);
486 }
487 
488 /*
489  * move to next cell in cells list
490  */
491 static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
492                                         loff_t *_pos)
493 {
494         struct afs_cell *cell = p->private;
495 
496         _enter("cell=%p pos=%Ld", cell, *_pos);
497         return seq_list_next(v, &cell->vl_list, _pos);
498 }
499 
500 /*
501  * clean up after reading from the cells list
502  */
503 static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
504 {
505         struct afs_cell *cell = p->private;
506 
507         up_read(&cell->vl_sem);
508 }
509 
510 static const char afs_vlocation_states[][4] = {
511         [AFS_VL_NEW]                    = "New",
512         [AFS_VL_CREATING]               = "Crt",
513         [AFS_VL_VALID]                  = "Val",
514         [AFS_VL_NO_VOLUME]              = "NoV",
515         [AFS_VL_UPDATING]               = "Upd",
516         [AFS_VL_VOLUME_DELETED]         = "Del",
517         [AFS_VL_UNCERTAIN]              = "Unc",
518 };
519 
520 /*
521  * display a header line followed by a load of volume lines
522  */
523 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
524 {
525         struct afs_cell *cell = m->private;
526         struct afs_vlocation *vlocation =
527                 list_entry(v, struct afs_vlocation, link);
528 
529         /* display header on line 1 */
530         if (v == &cell->vl_list) {
531                 seq_puts(m, "USE STT VLID[0]  VLID[1]  VLID[2]  NAME\n");
532                 return 0;
533         }
534 
535         /* display one cell per line on subsequent lines */
536         seq_printf(m, "%3d %s %08x %08x %08x %s\n",
537                    atomic_read(&vlocation->usage),
538                    afs_vlocation_states[vlocation->state],
539                    vlocation->vldb.vid[0],
540                    vlocation->vldb.vid[1],
541                    vlocation->vldb.vid[2],
542                    vlocation->vldb.name);
543 
544         return 0;
545 }
546 
547 /*
548  * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
549  * location server
550  */
551 static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
552 {
553         struct afs_cell *cell;
554         struct seq_file *m;
555         int ret;
556 
557         cell = PDE_DATA(inode);
558         if (!cell)
559                 return -ENOENT;
560 
561         ret = seq_open(file, &afs_proc_cell_vlservers_ops);
562         if (ret<0)
563                 return ret;
564 
565         m = file->private_data;
566         m->private = cell;
567 
568         return 0;
569 }
570 
571 /*
572  * close the file and release the ref to the cell
573  */
574 static int afs_proc_cell_vlservers_release(struct inode *inode,
575                                            struct file *file)
576 {
577         return seq_release(inode, file);
578 }
579 
580 /*
581  * set up the iterator to start reading from the cells list and return the
582  * first item
583  */
584 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
585 {
586         struct afs_cell *cell = m->private;
587         loff_t pos = *_pos;
588 
589         _enter("cell=%p pos=%Ld", cell, *_pos);
590 
591         /* lock the list against modification */
592         down_read(&cell->vl_sem);
593 
594         /* allow for the header line */
595         if (!pos)
596                 return (void *) 1;
597         pos--;
598 
599         if (pos >= cell->vl_naddrs)
600                 return NULL;
601 
602         return &cell->vl_addrs[pos];
603 }
604 
605 /*
606  * move to next cell in cells list
607  */
608 static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
609                                           loff_t *_pos)
610 {
611         struct afs_cell *cell = p->private;
612         loff_t pos;
613 
614         _enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos);
615 
616         pos = *_pos;
617         (*_pos)++;
618         if (pos >= cell->vl_naddrs)
619                 return NULL;
620 
621         return &cell->vl_addrs[pos];
622 }
623 
624 /*
625  * clean up after reading from the cells list
626  */
627 static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
628 {
629         struct afs_cell *cell = p->private;
630 
631         up_read(&cell->vl_sem);
632 }
633 
634 /*
635  * display a header line followed by a load of volume lines
636  */
637 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
638 {
639         struct in_addr *addr = v;
640 
641         /* display header on line 1 */
642         if (v == (struct in_addr *) 1) {
643                 seq_puts(m, "ADDRESS\n");
644                 return 0;
645         }
646 
647         /* display one cell per line on subsequent lines */
648         seq_printf(m, "%pI4\n", &addr->s_addr);
649         return 0;
650 }
651 
652 /*
653  * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
654  * servers
655  */
656 static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
657 {
658         struct afs_cell *cell;
659         struct seq_file *m;
660         int ret;
661 
662         cell = PDE_DATA(inode);
663         if (!cell)
664                 return -ENOENT;
665 
666         ret = seq_open(file, &afs_proc_cell_servers_ops);
667         if (ret < 0)
668                 return ret;
669 
670         m = file->private_data;
671         m->private = cell;
672         return 0;
673 }
674 
675 /*
676  * close the file and release the ref to the cell
677  */
678 static int afs_proc_cell_servers_release(struct inode *inode,
679                                          struct file *file)
680 {
681         return seq_release(inode, file);
682 }
683 
684 /*
685  * set up the iterator to start reading from the cells list and return the
686  * first item
687  */
688 static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
689         __acquires(m->private->servers_lock)
690 {
691         struct afs_cell *cell = m->private;
692 
693         _enter("cell=%p pos=%Ld", cell, *_pos);
694 
695         /* lock the list against modification */
696         read_lock(&cell->servers_lock);
697         return seq_list_start_head(&cell->servers, *_pos);
698 }
699 
700 /*
701  * move to next cell in cells list
702  */
703 static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
704                                         loff_t *_pos)
705 {
706         struct afs_cell *cell = p->private;
707 
708         _enter("cell=%p pos=%Ld", cell, *_pos);
709         return seq_list_next(v, &cell->servers, _pos);
710 }
711 
712 /*
713  * clean up after reading from the cells list
714  */
715 static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
716         __releases(p->private->servers_lock)
717 {
718         struct afs_cell *cell = p->private;
719 
720         read_unlock(&cell->servers_lock);
721 }
722 
723 /*
724  * display a header line followed by a load of volume lines
725  */
726 static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
727 {
728         struct afs_cell *cell = m->private;
729         struct afs_server *server = list_entry(v, struct afs_server, link);
730         char ipaddr[20];
731 
732         /* display header on line 1 */
733         if (v == &cell->servers) {
734                 seq_puts(m, "USE ADDR            STATE\n");
735                 return 0;
736         }
737 
738         /* display one cell per line on subsequent lines */
739         sprintf(ipaddr, "%pI4", &server->addr);
740         seq_printf(m, "%3d %-15.15s %5d\n",
741                    atomic_read(&server->usage), ipaddr, server->fs_state);
742 
743         return 0;
744 }
745 

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