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
 16struct afs_vl_seq_net_private {
 17	struct seq_net_private		seq;	/* Must be first */
 18	struct afs_vlserver_list	*vllist;
 19};
 20
 21static inline struct afs_net *afs_seq2net(struct seq_file *m)
 22{
 23	return afs_net(seq_file_net(m));
 24}
 25
 26static 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 */
 34static 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
 59static 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
 66static 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
 71static void afs_proc_cells_stop(struct seq_file *m, void *v)
 72	__releases(rcu)
 73{
 74	rcu_read_unlock();
 75}
 76
 77static 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 */
 88static 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
139done:
140	_leave(" = %d", ret);
141	return ret;
142
143inval:
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 */
152static 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		goto out;
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
194out:
195	rcu_read_unlock();
196	return 0;
197}
198
199/*
200 * Display the name of the current workstation cell.
201 */
202static int afs_proc_rootcell_show(struct seq_file *m, void *v)
203{
204	struct afs_cell *cell;
205	struct afs_net *net;
206
207	net = afs_seq2net_single(m);
208	down_read(&net->cells_lock);
209	cell = net->ws_cell;
210	if (cell)
211		seq_printf(m, "%s\n", cell->name);
212	up_read(&net->cells_lock);
 
 
213	return 0;
214}
215
216/*
217 * Set the current workstation cell and optionally supply its list of volume
218 * location servers.
219 *
220 *	echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
221 */
222static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
223{
224	struct seq_file *m = file->private_data;
225	struct afs_net *net = afs_seq2net_single(m);
226	char *s;
227	int ret;
228
229	ret = -EINVAL;
230	if (buf[0] == '.')
231		goto out;
232	if (memchr(buf, '/', size))
233		goto out;
234
235	/* trim to first NL */
236	s = memchr(buf, '\n', size);
237	if (s)
238		*s = 0;
239
240	/* determine command to perform */
241	_debug("rootcell=%s", buf);
242
243	ret = afs_cell_init(net, buf);
244
245out:
246	_leave(" = %d", ret);
247	return ret;
248}
249
250static const char afs_vol_types[3][3] = {
251	[AFSVL_RWVOL]	= "RW",
252	[AFSVL_ROVOL]	= "RO",
253	[AFSVL_BACKVOL]	= "BK",
254};
255
256/*
257 * Display the list of volumes known to a cell.
258 */
259static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
260{
261	struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
 
262
263	/* Display header on line 1 */
264	if (v == SEQ_START_TOKEN) {
265		seq_puts(m, "USE VID      TY NAME\n");
266		return 0;
267	}
268
269	seq_printf(m, "%3d %08llx %s %s\n",
270		   refcount_read(&vol->ref), vol->vid,
271		   afs_vol_types[vol->type],
272		   vol->name);
273
274	return 0;
275}
276
277static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
278	__acquires(cell->proc_lock)
279{
280	struct afs_cell *cell = pde_data(file_inode(m->file));
281
282	rcu_read_lock();
283	return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
284}
285
286static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
287					loff_t *_pos)
288{
289	struct afs_cell *cell = pde_data(file_inode(m->file));
290
291	return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
292}
293
294static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
295	__releases(cell->proc_lock)
296{
297	rcu_read_unlock();
 
 
298}
299
300static const struct seq_operations afs_proc_cell_volumes_ops = {
301	.start	= afs_proc_cell_volumes_start,
302	.next	= afs_proc_cell_volumes_next,
303	.stop	= afs_proc_cell_volumes_stop,
304	.show	= afs_proc_cell_volumes_show,
305};
306
307static const char *const dns_record_sources[NR__dns_record_source + 1] = {
308	[DNS_RECORD_UNAVAILABLE]	= "unav",
309	[DNS_RECORD_FROM_CONFIG]	= "cfg",
310	[DNS_RECORD_FROM_DNS_A]		= "A",
311	[DNS_RECORD_FROM_DNS_AFSDB]	= "AFSDB",
312	[DNS_RECORD_FROM_DNS_SRV]	= "SRV",
313	[DNS_RECORD_FROM_NSS]		= "nss",
314	[NR__dns_record_source]		= "[weird]"
315};
316
317static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
318	[DNS_LOOKUP_NOT_DONE]		= "no-lookup",
319	[DNS_LOOKUP_GOOD]		= "good",
320	[DNS_LOOKUP_GOOD_WITH_BAD]	= "good/bad",
321	[DNS_LOOKUP_BAD]		= "bad",
322	[DNS_LOOKUP_GOT_NOT_FOUND]	= "not-found",
323	[DNS_LOOKUP_GOT_LOCAL_FAILURE]	= "local-failure",
324	[DNS_LOOKUP_GOT_TEMP_FAILURE]	= "temp-failure",
325	[DNS_LOOKUP_GOT_NS_FAILURE]	= "ns-failure",
326	[NR__dns_lookup_status]		= "[weird]"
327};
328
329/*
330 * Display the list of Volume Location servers we're using for a cell.
331 */
332static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
333{
334	const struct afs_vl_seq_net_private *priv = m->private;
335	const struct afs_vlserver_list *vllist = priv->vllist;
336	const struct afs_vlserver_entry *entry;
337	const struct afs_vlserver *vlserver;
338	const struct afs_addr_list *alist;
339	int i;
340
341	if (v == SEQ_START_TOKEN) {
342		seq_printf(m, "# source %s, status %s\n",
343			   dns_record_sources[vllist ? vllist->source : 0],
344			   dns_lookup_statuses[vllist ? vllist->status : 0]);
345		return 0;
346	}
347
348	entry = v;
349	vlserver = entry->server;
350	alist = rcu_dereference(vlserver->addresses);
351
352	seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
353		   vlserver->name, entry->priority, entry->weight,
354		   dns_record_sources[alist ? alist->source : entry->source],
355		   dns_lookup_statuses[alist ? alist->status : entry->status]);
356	if (alist) {
357		for (i = 0; i < alist->nr_addrs; i++)
358			seq_printf(m, " %c %pISpc\n",
359				   alist->preferred == i ? '>' : '-',
360				   rxrpc_kernel_remote_addr(alist->addrs[i].peer));
361	}
362	seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
363	seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
364		   vlserver->probe.flags, vlserver->probe.error,
365		   vlserver->probe.abort_code,
366		   atomic_read(&vlserver->probe_outstanding));
367	return 0;
368}
369
370static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
371	__acquires(rcu)
372{
373	struct afs_vl_seq_net_private *priv = m->private;
374	struct afs_vlserver_list *vllist;
375	struct afs_cell *cell = pde_data(file_inode(m->file));
376	loff_t pos = *_pos;
377
378	rcu_read_lock();
379
380	vllist = rcu_dereference(cell->vl_servers);
381	priv->vllist = vllist;
382
383	if (pos < 0)
384		*_pos = pos = 0;
385	if (pos == 0)
386		return SEQ_START_TOKEN;
387
388	if (pos - 1 >= vllist->nr_servers)
389		return NULL;
390
391	return &vllist->servers[pos - 1];
392}
393
394static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
395					  loff_t *_pos)
396{
397	struct afs_vl_seq_net_private *priv = m->private;
398	struct afs_vlserver_list *vllist = priv->vllist;
399	loff_t pos;
400
401	pos = *_pos;
402	pos++;
403	*_pos = pos;
404	if (!vllist || pos - 1 >= vllist->nr_servers)
405		return NULL;
406
407	return &vllist->servers[pos - 1];
408}
409
410static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
411	__releases(rcu)
412{
413	rcu_read_unlock();
414}
415
416static const struct seq_operations afs_proc_cell_vlservers_ops = {
417	.start	= afs_proc_cell_vlservers_start,
418	.next	= afs_proc_cell_vlservers_next,
419	.stop	= afs_proc_cell_vlservers_stop,
420	.show	= afs_proc_cell_vlservers_show,
421};
422
423/*
424 * Display the list of fileservers we're using within a namespace.
425 */
426static int afs_proc_servers_show(struct seq_file *m, void *v)
427{
428	struct afs_endpoint_state *estate;
429	struct afs_addr_list *alist;
430	struct afs_server *server;
431	unsigned long failed;
432	int i;
433
434	if (v == SEQ_START_TOKEN) {
435		seq_puts(m, "UUID                                 REF ACT CELL\n");
436		return 0;
437	}
438
439	server = list_entry(v, struct afs_server, proc_link);
440	estate = rcu_dereference(server->endpoint_state);
441	alist = estate->addresses;
442	seq_printf(m, "%pU %3d %3d %s\n",
443		   &server->uuid,
444		   refcount_read(&server->ref),
445		   atomic_read(&server->active),
446		   server->cell->name);
447	seq_printf(m, "  - info: fl=%lx rtt=%u\n",
448		   server->flags, server->rtt);
449	seq_printf(m, "  - probe: last=%d\n",
450		   (int)(jiffies - server->probed_at) / HZ);
451	failed = estate->failed_set;
452	seq_printf(m, "  - ESTATE pq=%x np=%u rsp=%lx f=%lx\n",
453		   estate->probe_seq, atomic_read(&estate->nr_probing),
454		   estate->responsive_set, estate->failed_set);
455	seq_printf(m, "  - ALIST v=%u ap=%u\n",
456		   alist->version, alist->addr_pref_version);
457	for (i = 0; i < alist->nr_addrs; i++) {
458		const struct afs_address *addr = &alist->addrs[i];
459
460		seq_printf(m, "    [%x] %pISpc%s rtt=%d err=%d p=%u\n",
461			   i, rxrpc_kernel_remote_addr(addr->peer),
462			   alist->preferred == i ? "*" :
463			   test_bit(i, &failed) ? "!" : "",
464			   rxrpc_kernel_get_srtt(addr->peer),
465			   addr->last_error, addr->prio);
466	}
467	return 0;
468}
469
470static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
471	__acquires(rcu)
472{
473	rcu_read_lock();
474	return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
475}
476
477static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
478{
479	return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
480}
481
482static void afs_proc_servers_stop(struct seq_file *m, void *v)
483	__releases(rcu)
484{
485	rcu_read_unlock();
486}
487
488static const struct seq_operations afs_proc_servers_ops = {
489	.start	= afs_proc_servers_start,
490	.next	= afs_proc_servers_next,
491	.stop	= afs_proc_servers_stop,
492	.show	= afs_proc_servers_show,
493};
494
495/*
496 * Display the list of strings that may be substituted for the @sys pathname
497 * macro.
498 */
499static int afs_proc_sysname_show(struct seq_file *m, void *v)
500{
501	struct afs_net *net = afs_seq2net(m);
502	struct afs_sysnames *sysnames = net->sysnames;
503	unsigned int i = (unsigned long)v - 1;
504
505	if (i < sysnames->nr)
506		seq_printf(m, "%s\n", sysnames->subs[i]);
507	return 0;
508}
509
510static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
511	__acquires(&net->sysnames_lock)
512{
513	struct afs_net *net = afs_seq2net(m);
514	struct afs_sysnames *names;
515
516	read_lock(&net->sysnames_lock);
517
518	names = net->sysnames;
519	if (*pos >= names->nr)
520		return NULL;
521	return (void *)(unsigned long)(*pos + 1);
522}
523
524static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
525{
526	struct afs_net *net = afs_seq2net(m);
527	struct afs_sysnames *names = net->sysnames;
528
529	*pos += 1;
530	if (*pos >= names->nr)
531		return NULL;
532	return (void *)(unsigned long)(*pos + 1);
533}
534
535static void afs_proc_sysname_stop(struct seq_file *m, void *v)
536	__releases(&net->sysnames_lock)
537{
538	struct afs_net *net = afs_seq2net(m);
539
540	read_unlock(&net->sysnames_lock);
541}
542
543static const struct seq_operations afs_proc_sysname_ops = {
544	.start	= afs_proc_sysname_start,
545	.next	= afs_proc_sysname_next,
546	.stop	= afs_proc_sysname_stop,
547	.show	= afs_proc_sysname_show,
548};
549
550/*
551 * Allow the @sys substitution to be configured.
552 */
553static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
554{
555	struct afs_sysnames *sysnames, *kill;
556	struct seq_file *m = file->private_data;
557	struct afs_net *net = afs_seq2net(m);
558	char *s, *p, *sub;
559	int ret, len;
560
561	sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
562	if (!sysnames)
563		return -ENOMEM;
564	refcount_set(&sysnames->usage, 1);
565	kill = sysnames;
566
567	p = buf;
568	while ((s = strsep(&p, " \t\n"))) {
569		len = strlen(s);
570		if (len == 0)
571			continue;
572		ret = -ENAMETOOLONG;
573		if (len >= AFSNAMEMAX)
574			goto error;
575
576		if (len >= 4 &&
577		    s[len - 4] == '@' &&
578		    s[len - 3] == 's' &&
579		    s[len - 2] == 'y' &&
580		    s[len - 1] == 's')
581			/* Protect against recursion */
582			goto invalid;
583
584		if (s[0] == '.' &&
585		    (len < 2 || (len == 2 && s[1] == '.')))
586			goto invalid;
587
588		if (memchr(s, '/', len))
589			goto invalid;
590
591		ret = -EFBIG;
592		if (sysnames->nr >= AFS_NR_SYSNAME)
593			goto out;
594
595		if (strcmp(s, afs_init_sysname) == 0) {
596			sub = (char *)afs_init_sysname;
597		} else {
598			ret = -ENOMEM;
599			sub = kmemdup(s, len + 1, GFP_KERNEL);
600			if (!sub)
601				goto out;
602		}
603
604		sysnames->subs[sysnames->nr] = sub;
605		sysnames->nr++;
606	}
607
608	if (sysnames->nr == 0) {
609		sysnames->subs[0] = sysnames->blank;
610		sysnames->nr++;
611	}
612
613	write_lock(&net->sysnames_lock);
614	kill = net->sysnames;
615	net->sysnames = sysnames;
616	write_unlock(&net->sysnames_lock);
617	ret = 0;
618out:
619	afs_put_sysnames(kill);
620	return ret;
621
622invalid:
623	ret = -EINVAL;
624error:
625	goto out;
626}
627
628void afs_put_sysnames(struct afs_sysnames *sysnames)
629{
630	int i;
631
632	if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
633		for (i = 0; i < sysnames->nr; i++)
634			if (sysnames->subs[i] != afs_init_sysname &&
635			    sysnames->subs[i] != sysnames->blank)
636				kfree(sysnames->subs[i]);
637		kfree(sysnames);
638	}
639}
640
641/*
642 * Display general per-net namespace statistics
643 */
644static int afs_proc_stats_show(struct seq_file *m, void *v)
645{
646	struct afs_net *net = afs_seq2net_single(m);
647
648	seq_puts(m, "kAFS statistics\n");
649
650	seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
651		   atomic_read(&net->n_lookup),
652		   atomic_read(&net->n_reval),
653		   atomic_read(&net->n_inval),
654		   atomic_read(&net->n_relpg));
655
656	seq_printf(m, "dir-data: rdpg=%u\n",
657		   atomic_read(&net->n_read_dir));
658
659	seq_printf(m, "dir-edit: cr=%u rm=%u\n",
660		   atomic_read(&net->n_dir_cr),
661		   atomic_read(&net->n_dir_rm));
662
663	seq_printf(m, "file-rd : n=%u nb=%lu\n",
664		   atomic_read(&net->n_fetches),
665		   atomic_long_read(&net->n_fetch_bytes));
666	seq_printf(m, "file-wr : n=%u nb=%lu\n",
667		   atomic_read(&net->n_stores),
668		   atomic_long_read(&net->n_store_bytes));
669	return 0;
670}
671
672/*
673 * initialise /proc/fs/afs/<cell>/
674 */
675int afs_proc_cell_setup(struct afs_cell *cell)
676{
677	struct proc_dir_entry *dir;
678	struct afs_net *net = cell->net;
679
680	_enter("%p{%s},%p", cell, cell->name, net->proc_afs);
681
682	dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
683	if (!dir)
684		goto error_dir;
685
686	if (!proc_create_net_data("vlservers", 0444, dir,
687				  &afs_proc_cell_vlservers_ops,
688				  sizeof(struct afs_vl_seq_net_private),
689				  cell) ||
690	    !proc_create_net_data("volumes", 0444, dir,
691				  &afs_proc_cell_volumes_ops,
692				  sizeof(struct seq_net_private),
693				  cell))
694		goto error_tree;
695
696	_leave(" = 0");
697	return 0;
698
699error_tree:
700	remove_proc_subtree(cell->name, net->proc_afs);
701error_dir:
702	_leave(" = -ENOMEM");
703	return -ENOMEM;
704}
705
706/*
707 * remove /proc/fs/afs/<cell>/
708 */
709void afs_proc_cell_remove(struct afs_cell *cell)
710{
711	struct afs_net *net = cell->net;
712
713	_enter("");
714	remove_proc_subtree(cell->name, net->proc_afs);
715	_leave("");
716}
717
718/*
719 * initialise the /proc/fs/afs/ directory
720 */
721int afs_proc_init(struct afs_net *net)
722{
723	struct proc_dir_entry *p;
724
725	_enter("");
726
727	p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
728	if (!p)
729		goto error_dir;
730
731	if (!proc_create_net_data_write("cells", 0644, p,
732					&afs_proc_cells_ops,
733					afs_proc_cells_write,
734					sizeof(struct seq_net_private),
735					NULL) ||
736	    !proc_create_net_single_write("rootcell", 0644, p,
737					  afs_proc_rootcell_show,
738					  afs_proc_rootcell_write,
739					  NULL) ||
740	    !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
741			     sizeof(struct seq_net_private)) ||
742	    !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
743	    !proc_create_net_data_write("sysname", 0644, p,
744					&afs_proc_sysname_ops,
745					afs_proc_sysname_write,
746					sizeof(struct seq_net_private),
747					NULL) ||
748	    !proc_create_net_single_write("addr_prefs", 0644, p,
749					  afs_proc_addr_prefs_show,
750					  afs_proc_addr_prefs_write,
751					  NULL))
752		goto error_tree;
753
754	net->proc_afs = p;
755	_leave(" = 0");
756	return 0;
757
758error_tree:
759	proc_remove(p);
760error_dir:
761	_leave(" = -ENOMEM");
762	return -ENOMEM;
763}
764
765/*
766 * clean up the /proc/fs/afs/ directory
767 */
768void afs_proc_cleanup(struct afs_net *net)
769{
770	proc_remove(net->proc_afs);
771	net->proc_afs = NULL;
772}