xref: /linux/fs/afs/proc.c (revision 24b10e5f8e0d2bee1a10fc67011ea5d936c1a389)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* /proc interface for AFS
3  *
4  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5  * Written by David Howells (dhowells@redhat.com)
6  */
7 
8 #include <linux/slab.h>
9 #include <linux/module.h>
10 #include <linux/proc_fs.h>
11 #include <linux/seq_file.h>
12 #include <linux/sched.h>
13 #include <linux/uaccess.h>
14 #include "internal.h"
15 
16 struct afs_vl_seq_net_private {
17 	struct seq_net_private		seq;	/* Must be first */
18 	struct afs_vlserver_list	*vllist;
19 };
20 
21 static inline struct afs_net *afs_seq2net(struct seq_file *m)
22 {
23 	return afs_net(seq_file_net(m));
24 }
25 
26 static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
27 {
28 	return afs_net(seq_file_single_net(m));
29 }
30 
31 /*
32  * Display the list of cells known to the namespace.
33  */
34 static int afs_proc_cells_show(struct seq_file *m, void *v)
35 {
36 	struct afs_vlserver_list *vllist;
37 	struct afs_cell *cell;
38 
39 	if (v == SEQ_START_TOKEN) {
40 		/* display header on line 1 */
41 		seq_puts(m, "USE ACT    TTL SV ST NAME\n");
42 		return 0;
43 	}
44 
45 	cell = list_entry(v, struct afs_cell, proc_link);
46 	vllist = rcu_dereference(cell->vl_servers);
47 
48 	/* display one cell per line on subsequent lines */
49 	seq_printf(m, "%3u %3u %6lld %2u %2u %s\n",
50 		   refcount_read(&cell->ref),
51 		   atomic_read(&cell->active),
52 		   cell->dns_expiry - ktime_get_real_seconds(),
53 		   vllist ? vllist->nr_servers : 0,
54 		   cell->state,
55 		   cell->name);
56 	return 0;
57 }
58 
59 static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
60 	__acquires(rcu)
61 {
62 	rcu_read_lock();
63 	return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
64 }
65 
66 static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
67 {
68 	return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
69 }
70 
71 static void afs_proc_cells_stop(struct seq_file *m, void *v)
72 	__releases(rcu)
73 {
74 	rcu_read_unlock();
75 }
76 
77 static const struct seq_operations afs_proc_cells_ops = {
78 	.start	= afs_proc_cells_start,
79 	.next	= afs_proc_cells_next,
80 	.stop	= afs_proc_cells_stop,
81 	.show	= afs_proc_cells_show,
82 };
83 
84 /*
85  * handle writes to /proc/fs/afs/cells
86  * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
87  */
88 static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
89 {
90 	struct seq_file *m = file->private_data;
91 	struct afs_net *net = afs_seq2net(m);
92 	char *name, *args;
93 	int ret;
94 
95 	/* trim to first NL */
96 	name = memchr(buf, '\n', size);
97 	if (name)
98 		*name = 0;
99 
100 	/* split into command, name and argslist */
101 	name = strchr(buf, ' ');
102 	if (!name)
103 		goto inval;
104 	do {
105 		*name++ = 0;
106 	} while(*name == ' ');
107 	if (!*name)
108 		goto inval;
109 
110 	args = strchr(name, ' ');
111 	if (args) {
112 		do {
113 			*args++ = 0;
114 		} while(*args == ' ');
115 		if (!*args)
116 			goto inval;
117 	}
118 
119 	/* determine command to perform */
120 	_debug("cmd=%s name=%s args=%s", buf, name, args);
121 
122 	if (strcmp(buf, "add") == 0) {
123 		struct afs_cell *cell;
124 
125 		cell = afs_lookup_cell(net, name, strlen(name), args, true);
126 		if (IS_ERR(cell)) {
127 			ret = PTR_ERR(cell);
128 			goto done;
129 		}
130 
131 		if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
132 			afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin);
133 	} else {
134 		goto inval;
135 	}
136 
137 	ret = 0;
138 
139 done:
140 	_leave(" = %d", ret);
141 	return ret;
142 
143 inval:
144 	ret = -EINVAL;
145 	printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
146 	goto done;
147 }
148 
149 /*
150  * Display the list of addr_prefs known to the namespace.
151  */
152 static int afs_proc_addr_prefs_show(struct seq_file *m, void *v)
153 {
154 	struct afs_addr_preference_list *preflist;
155 	struct afs_addr_preference *pref;
156 	struct afs_net *net = afs_seq2net_single(m);
157 	union {
158 		struct sockaddr_in sin;
159 		struct sockaddr_in6 sin6;
160 	} addr;
161 	unsigned int i;
162 	char buf[44]; /* Maximum ipv6 + max subnet is 43 */
163 
164 	rcu_read_lock();
165 	preflist = rcu_dereference(net->address_prefs);
166 
167 	if (!preflist) {
168 		seq_puts(m, "NO PREFS\n");
169 		return 0;
170 	}
171 
172 	seq_printf(m, "PROT SUBNET                                      PRIOR (v=%u n=%u/%u/%u)\n",
173 		   preflist->version, preflist->ipv6_off, preflist->nr, preflist->max_prefs);
174 
175 	memset(&addr, 0, sizeof(addr));
176 
177 	for (i = 0; i < preflist->nr; i++) {
178 		pref = &preflist->prefs[i];
179 
180 		addr.sin.sin_family = pref->family;
181 		if (pref->family == AF_INET) {
182 			memcpy(&addr.sin.sin_addr, &pref->ipv4_addr,
183 			       sizeof(addr.sin.sin_addr));
184 			snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin, pref->subnet_mask);
185 			seq_printf(m, "UDP  %-43.43s %5u\n", buf, pref->prio);
186 		} else {
187 			memcpy(&addr.sin6.sin6_addr, &pref->ipv6_addr,
188 			       sizeof(addr.sin6.sin6_addr));
189 			snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin6, pref->subnet_mask);
190 			seq_printf(m, "UDP  %-43.43s %5u\n", buf, pref->prio);
191 		}
192 	}
193 
194 	rcu_read_lock();
195 	return 0;
196 }
197 
198 /*
199  * Display the name of the current workstation cell.
200  */
201 static int afs_proc_rootcell_show(struct seq_file *m, void *v)
202 {
203 	struct afs_cell *cell;
204 	struct afs_net *net;
205 
206 	net = afs_seq2net_single(m);
207 	down_read(&net->cells_lock);
208 	cell = net->ws_cell;
209 	if (cell)
210 		seq_printf(m, "%s\n", cell->name);
211 	up_read(&net->cells_lock);
212 	return 0;
213 }
214 
215 /*
216  * Set the current workstation cell and optionally supply its list of volume
217  * location servers.
218  *
219  *	echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
220  */
221 static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
222 {
223 	struct seq_file *m = file->private_data;
224 	struct afs_net *net = afs_seq2net_single(m);
225 	char *s;
226 	int ret;
227 
228 	ret = -EINVAL;
229 	if (buf[0] == '.')
230 		goto out;
231 	if (memchr(buf, '/', size))
232 		goto out;
233 
234 	/* trim to first NL */
235 	s = memchr(buf, '\n', size);
236 	if (s)
237 		*s = 0;
238 
239 	/* determine command to perform */
240 	_debug("rootcell=%s", buf);
241 
242 	ret = afs_cell_init(net, buf);
243 
244 out:
245 	_leave(" = %d", ret);
246 	return ret;
247 }
248 
249 static const char afs_vol_types[3][3] = {
250 	[AFSVL_RWVOL]	= "RW",
251 	[AFSVL_ROVOL]	= "RO",
252 	[AFSVL_BACKVOL]	= "BK",
253 };
254 
255 /*
256  * Display the list of volumes known to a cell.
257  */
258 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
259 {
260 	struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
261 
262 	/* Display header on line 1 */
263 	if (v == SEQ_START_TOKEN) {
264 		seq_puts(m, "USE VID      TY NAME\n");
265 		return 0;
266 	}
267 
268 	seq_printf(m, "%3d %08llx %s %s\n",
269 		   refcount_read(&vol->ref), vol->vid,
270 		   afs_vol_types[vol->type],
271 		   vol->name);
272 
273 	return 0;
274 }
275 
276 static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
277 	__acquires(cell->proc_lock)
278 {
279 	struct afs_cell *cell = pde_data(file_inode(m->file));
280 
281 	rcu_read_lock();
282 	return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
283 }
284 
285 static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
286 					loff_t *_pos)
287 {
288 	struct afs_cell *cell = pde_data(file_inode(m->file));
289 
290 	return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
291 }
292 
293 static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
294 	__releases(cell->proc_lock)
295 {
296 	rcu_read_unlock();
297 }
298 
299 static const struct seq_operations afs_proc_cell_volumes_ops = {
300 	.start	= afs_proc_cell_volumes_start,
301 	.next	= afs_proc_cell_volumes_next,
302 	.stop	= afs_proc_cell_volumes_stop,
303 	.show	= afs_proc_cell_volumes_show,
304 };
305 
306 static const char *const dns_record_sources[NR__dns_record_source + 1] = {
307 	[DNS_RECORD_UNAVAILABLE]	= "unav",
308 	[DNS_RECORD_FROM_CONFIG]	= "cfg",
309 	[DNS_RECORD_FROM_DNS_A]		= "A",
310 	[DNS_RECORD_FROM_DNS_AFSDB]	= "AFSDB",
311 	[DNS_RECORD_FROM_DNS_SRV]	= "SRV",
312 	[DNS_RECORD_FROM_NSS]		= "nss",
313 	[NR__dns_record_source]		= "[weird]"
314 };
315 
316 static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
317 	[DNS_LOOKUP_NOT_DONE]		= "no-lookup",
318 	[DNS_LOOKUP_GOOD]		= "good",
319 	[DNS_LOOKUP_GOOD_WITH_BAD]	= "good/bad",
320 	[DNS_LOOKUP_BAD]		= "bad",
321 	[DNS_LOOKUP_GOT_NOT_FOUND]	= "not-found",
322 	[DNS_LOOKUP_GOT_LOCAL_FAILURE]	= "local-failure",
323 	[DNS_LOOKUP_GOT_TEMP_FAILURE]	= "temp-failure",
324 	[DNS_LOOKUP_GOT_NS_FAILURE]	= "ns-failure",
325 	[NR__dns_lookup_status]		= "[weird]"
326 };
327 
328 /*
329  * Display the list of Volume Location servers we're using for a cell.
330  */
331 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
332 {
333 	const struct afs_vl_seq_net_private *priv = m->private;
334 	const struct afs_vlserver_list *vllist = priv->vllist;
335 	const struct afs_vlserver_entry *entry;
336 	const struct afs_vlserver *vlserver;
337 	const struct afs_addr_list *alist;
338 	int i;
339 
340 	if (v == SEQ_START_TOKEN) {
341 		seq_printf(m, "# source %s, status %s\n",
342 			   dns_record_sources[vllist ? vllist->source : 0],
343 			   dns_lookup_statuses[vllist ? vllist->status : 0]);
344 		return 0;
345 	}
346 
347 	entry = v;
348 	vlserver = entry->server;
349 	alist = rcu_dereference(vlserver->addresses);
350 
351 	seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
352 		   vlserver->name, entry->priority, entry->weight,
353 		   dns_record_sources[alist ? alist->source : entry->source],
354 		   dns_lookup_statuses[alist ? alist->status : entry->status]);
355 	if (alist) {
356 		for (i = 0; i < alist->nr_addrs; i++)
357 			seq_printf(m, " %c %pISpc\n",
358 				   alist->preferred == i ? '>' : '-',
359 				   rxrpc_kernel_remote_addr(alist->addrs[i].peer));
360 	}
361 	seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
362 	seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
363 		   vlserver->probe.flags, vlserver->probe.error,
364 		   vlserver->probe.abort_code,
365 		   atomic_read(&vlserver->probe_outstanding));
366 	return 0;
367 }
368 
369 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
370 	__acquires(rcu)
371 {
372 	struct afs_vl_seq_net_private *priv = m->private;
373 	struct afs_vlserver_list *vllist;
374 	struct afs_cell *cell = pde_data(file_inode(m->file));
375 	loff_t pos = *_pos;
376 
377 	rcu_read_lock();
378 
379 	vllist = rcu_dereference(cell->vl_servers);
380 	priv->vllist = vllist;
381 
382 	if (pos < 0)
383 		*_pos = pos = 0;
384 	if (pos == 0)
385 		return SEQ_START_TOKEN;
386 
387 	if (pos - 1 >= vllist->nr_servers)
388 		return NULL;
389 
390 	return &vllist->servers[pos - 1];
391 }
392 
393 static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
394 					  loff_t *_pos)
395 {
396 	struct afs_vl_seq_net_private *priv = m->private;
397 	struct afs_vlserver_list *vllist = priv->vllist;
398 	loff_t pos;
399 
400 	pos = *_pos;
401 	pos++;
402 	*_pos = pos;
403 	if (!vllist || pos - 1 >= vllist->nr_servers)
404 		return NULL;
405 
406 	return &vllist->servers[pos - 1];
407 }
408 
409 static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
410 	__releases(rcu)
411 {
412 	rcu_read_unlock();
413 }
414 
415 static const struct seq_operations afs_proc_cell_vlservers_ops = {
416 	.start	= afs_proc_cell_vlservers_start,
417 	.next	= afs_proc_cell_vlservers_next,
418 	.stop	= afs_proc_cell_vlservers_stop,
419 	.show	= afs_proc_cell_vlservers_show,
420 };
421 
422 /*
423  * Display the list of fileservers we're using within a namespace.
424  */
425 static int afs_proc_servers_show(struct seq_file *m, void *v)
426 {
427 	struct afs_endpoint_state *estate;
428 	struct afs_addr_list *alist;
429 	struct afs_server *server;
430 	unsigned long failed;
431 	int i;
432 
433 	if (v == SEQ_START_TOKEN) {
434 		seq_puts(m, "UUID                                 REF ACT CELL\n");
435 		return 0;
436 	}
437 
438 	server = list_entry(v, struct afs_server, proc_link);
439 	estate = rcu_dereference(server->endpoint_state);
440 	alist = estate->addresses;
441 	seq_printf(m, "%pU %3d %3d %s\n",
442 		   &server->uuid,
443 		   refcount_read(&server->ref),
444 		   atomic_read(&server->active),
445 		   server->cell->name);
446 	seq_printf(m, "  - info: fl=%lx rtt=%u\n",
447 		   server->flags, server->rtt);
448 	seq_printf(m, "  - probe: last=%d\n",
449 		   (int)(jiffies - server->probed_at) / HZ);
450 	failed = estate->failed_set;
451 	seq_printf(m, "  - ESTATE pq=%x np=%u rsp=%lx f=%lx\n",
452 		   estate->probe_seq, atomic_read(&estate->nr_probing),
453 		   estate->responsive_set, estate->failed_set);
454 	seq_printf(m, "  - ALIST v=%u ap=%u\n",
455 		   alist->version, alist->addr_pref_version);
456 	for (i = 0; i < alist->nr_addrs; i++) {
457 		const struct afs_address *addr = &alist->addrs[i];
458 
459 		seq_printf(m, "    [%x] %pISpc%s rtt=%d err=%d p=%u\n",
460 			   i, rxrpc_kernel_remote_addr(addr->peer),
461 			   alist->preferred == i ? "*" :
462 			   test_bit(i, &failed) ? "!" : "",
463 			   rxrpc_kernel_get_srtt(addr->peer),
464 			   addr->last_error, addr->prio);
465 	}
466 	return 0;
467 }
468 
469 static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
470 	__acquires(rcu)
471 {
472 	rcu_read_lock();
473 	return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
474 }
475 
476 static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
477 {
478 	return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
479 }
480 
481 static void afs_proc_servers_stop(struct seq_file *m, void *v)
482 	__releases(rcu)
483 {
484 	rcu_read_unlock();
485 }
486 
487 static const struct seq_operations afs_proc_servers_ops = {
488 	.start	= afs_proc_servers_start,
489 	.next	= afs_proc_servers_next,
490 	.stop	= afs_proc_servers_stop,
491 	.show	= afs_proc_servers_show,
492 };
493 
494 /*
495  * Display the list of strings that may be substituted for the @sys pathname
496  * macro.
497  */
498 static int afs_proc_sysname_show(struct seq_file *m, void *v)
499 {
500 	struct afs_net *net = afs_seq2net(m);
501 	struct afs_sysnames *sysnames = net->sysnames;
502 	unsigned int i = (unsigned long)v - 1;
503 
504 	if (i < sysnames->nr)
505 		seq_printf(m, "%s\n", sysnames->subs[i]);
506 	return 0;
507 }
508 
509 static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
510 	__acquires(&net->sysnames_lock)
511 {
512 	struct afs_net *net = afs_seq2net(m);
513 	struct afs_sysnames *names;
514 
515 	read_lock(&net->sysnames_lock);
516 
517 	names = net->sysnames;
518 	if (*pos >= names->nr)
519 		return NULL;
520 	return (void *)(unsigned long)(*pos + 1);
521 }
522 
523 static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
524 {
525 	struct afs_net *net = afs_seq2net(m);
526 	struct afs_sysnames *names = net->sysnames;
527 
528 	*pos += 1;
529 	if (*pos >= names->nr)
530 		return NULL;
531 	return (void *)(unsigned long)(*pos + 1);
532 }
533 
534 static void afs_proc_sysname_stop(struct seq_file *m, void *v)
535 	__releases(&net->sysnames_lock)
536 {
537 	struct afs_net *net = afs_seq2net(m);
538 
539 	read_unlock(&net->sysnames_lock);
540 }
541 
542 static const struct seq_operations afs_proc_sysname_ops = {
543 	.start	= afs_proc_sysname_start,
544 	.next	= afs_proc_sysname_next,
545 	.stop	= afs_proc_sysname_stop,
546 	.show	= afs_proc_sysname_show,
547 };
548 
549 /*
550  * Allow the @sys substitution to be configured.
551  */
552 static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
553 {
554 	struct afs_sysnames *sysnames, *kill;
555 	struct seq_file *m = file->private_data;
556 	struct afs_net *net = afs_seq2net(m);
557 	char *s, *p, *sub;
558 	int ret, len;
559 
560 	sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
561 	if (!sysnames)
562 		return -ENOMEM;
563 	refcount_set(&sysnames->usage, 1);
564 	kill = sysnames;
565 
566 	p = buf;
567 	while ((s = strsep(&p, " \t\n"))) {
568 		len = strlen(s);
569 		if (len == 0)
570 			continue;
571 		ret = -ENAMETOOLONG;
572 		if (len >= AFSNAMEMAX)
573 			goto error;
574 
575 		if (len >= 4 &&
576 		    s[len - 4] == '@' &&
577 		    s[len - 3] == 's' &&
578 		    s[len - 2] == 'y' &&
579 		    s[len - 1] == 's')
580 			/* Protect against recursion */
581 			goto invalid;
582 
583 		if (s[0] == '.' &&
584 		    (len < 2 || (len == 2 && s[1] == '.')))
585 			goto invalid;
586 
587 		if (memchr(s, '/', len))
588 			goto invalid;
589 
590 		ret = -EFBIG;
591 		if (sysnames->nr >= AFS_NR_SYSNAME)
592 			goto out;
593 
594 		if (strcmp(s, afs_init_sysname) == 0) {
595 			sub = (char *)afs_init_sysname;
596 		} else {
597 			ret = -ENOMEM;
598 			sub = kmemdup(s, len + 1, GFP_KERNEL);
599 			if (!sub)
600 				goto out;
601 		}
602 
603 		sysnames->subs[sysnames->nr] = sub;
604 		sysnames->nr++;
605 	}
606 
607 	if (sysnames->nr == 0) {
608 		sysnames->subs[0] = sysnames->blank;
609 		sysnames->nr++;
610 	}
611 
612 	write_lock(&net->sysnames_lock);
613 	kill = net->sysnames;
614 	net->sysnames = sysnames;
615 	write_unlock(&net->sysnames_lock);
616 	ret = 0;
617 out:
618 	afs_put_sysnames(kill);
619 	return ret;
620 
621 invalid:
622 	ret = -EINVAL;
623 error:
624 	goto out;
625 }
626 
627 void afs_put_sysnames(struct afs_sysnames *sysnames)
628 {
629 	int i;
630 
631 	if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
632 		for (i = 0; i < sysnames->nr; i++)
633 			if (sysnames->subs[i] != afs_init_sysname &&
634 			    sysnames->subs[i] != sysnames->blank)
635 				kfree(sysnames->subs[i]);
636 		kfree(sysnames);
637 	}
638 }
639 
640 /*
641  * Display general per-net namespace statistics
642  */
643 static int afs_proc_stats_show(struct seq_file *m, void *v)
644 {
645 	struct afs_net *net = afs_seq2net_single(m);
646 
647 	seq_puts(m, "kAFS statistics\n");
648 
649 	seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
650 		   atomic_read(&net->n_lookup),
651 		   atomic_read(&net->n_reval),
652 		   atomic_read(&net->n_inval),
653 		   atomic_read(&net->n_relpg));
654 
655 	seq_printf(m, "dir-data: rdpg=%u\n",
656 		   atomic_read(&net->n_read_dir));
657 
658 	seq_printf(m, "dir-edit: cr=%u rm=%u\n",
659 		   atomic_read(&net->n_dir_cr),
660 		   atomic_read(&net->n_dir_rm));
661 
662 	seq_printf(m, "file-rd : n=%u nb=%lu\n",
663 		   atomic_read(&net->n_fetches),
664 		   atomic_long_read(&net->n_fetch_bytes));
665 	seq_printf(m, "file-wr : n=%u nb=%lu\n",
666 		   atomic_read(&net->n_stores),
667 		   atomic_long_read(&net->n_store_bytes));
668 	return 0;
669 }
670 
671 /*
672  * initialise /proc/fs/afs/<cell>/
673  */
674 int afs_proc_cell_setup(struct afs_cell *cell)
675 {
676 	struct proc_dir_entry *dir;
677 	struct afs_net *net = cell->net;
678 
679 	_enter("%p{%s},%p", cell, cell->name, net->proc_afs);
680 
681 	dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
682 	if (!dir)
683 		goto error_dir;
684 
685 	if (!proc_create_net_data("vlservers", 0444, dir,
686 				  &afs_proc_cell_vlservers_ops,
687 				  sizeof(struct afs_vl_seq_net_private),
688 				  cell) ||
689 	    !proc_create_net_data("volumes", 0444, dir,
690 				  &afs_proc_cell_volumes_ops,
691 				  sizeof(struct seq_net_private),
692 				  cell))
693 		goto error_tree;
694 
695 	_leave(" = 0");
696 	return 0;
697 
698 error_tree:
699 	remove_proc_subtree(cell->name, net->proc_afs);
700 error_dir:
701 	_leave(" = -ENOMEM");
702 	return -ENOMEM;
703 }
704 
705 /*
706  * remove /proc/fs/afs/<cell>/
707  */
708 void afs_proc_cell_remove(struct afs_cell *cell)
709 {
710 	struct afs_net *net = cell->net;
711 
712 	_enter("");
713 	remove_proc_subtree(cell->name, net->proc_afs);
714 	_leave("");
715 }
716 
717 /*
718  * initialise the /proc/fs/afs/ directory
719  */
720 int afs_proc_init(struct afs_net *net)
721 {
722 	struct proc_dir_entry *p;
723 
724 	_enter("");
725 
726 	p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
727 	if (!p)
728 		goto error_dir;
729 
730 	if (!proc_create_net_data_write("cells", 0644, p,
731 					&afs_proc_cells_ops,
732 					afs_proc_cells_write,
733 					sizeof(struct seq_net_private),
734 					NULL) ||
735 	    !proc_create_net_single_write("rootcell", 0644, p,
736 					  afs_proc_rootcell_show,
737 					  afs_proc_rootcell_write,
738 					  NULL) ||
739 	    !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
740 			     sizeof(struct seq_net_private)) ||
741 	    !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
742 	    !proc_create_net_data_write("sysname", 0644, p,
743 					&afs_proc_sysname_ops,
744 					afs_proc_sysname_write,
745 					sizeof(struct seq_net_private),
746 					NULL) ||
747 	    !proc_create_net_single_write("addr_prefs", 0644, p,
748 					  afs_proc_addr_prefs_show,
749 					  afs_proc_addr_prefs_write,
750 					  NULL))
751 		goto error_tree;
752 
753 	net->proc_afs = p;
754 	_leave(" = 0");
755 	return 0;
756 
757 error_tree:
758 	proc_remove(p);
759 error_dir:
760 	_leave(" = -ENOMEM");
761 	return -ENOMEM;
762 }
763 
764 /*
765  * clean up the /proc/fs/afs/ directory
766  */
767 void afs_proc_cleanup(struct afs_net *net)
768 {
769 	proc_remove(net->proc_afs);
770 	net->proc_afs = NULL;
771 }
772