blob: 1d21465a4108daf63d3f045fdcaab131f9df9ac1 [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
David Howellsec268152007-04-26 15:49:28 -07002/* /proc interface for AFS
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/seq_file.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040012#include <linux/sched.h>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080013#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include "internal.h"
15
David Howells0a5143f2018-10-20 00:57:57 +010016struct afs_vl_seq_net_private {
17 struct seq_net_private seq; /* Must be first */
18 struct afs_vlserver_list *vllist;
19};
20
David Howellsf044c882017-11-02 15:27:45 +000021static inline struct afs_net *afs_seq2net(struct seq_file *m)
22{
David Howells5b86d4f2018-05-18 11:46:15 +010023 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));
David Howellsf044c882017-11-02 15:27:45 +000029}
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031/*
David Howells5d9de252018-05-18 11:46:15 +010032 * Display the list of cells known to the namespace.
David Howellsf0691682018-05-18 11:46:14 +010033 */
34static int afs_proc_cells_show(struct seq_file *m, void *v)
35{
David Howellsded2f4c2018-10-20 00:57:57 +010036 struct afs_vlserver_list *vllist;
37 struct afs_cell *cell;
David Howellsf0691682018-05-18 11:46:14 +010038
David Howells6b3944e2018-10-11 22:45:49 +010039 if (v == SEQ_START_TOKEN) {
David Howellsf0691682018-05-18 11:46:14 +010040 /* display header on line 1 */
David Howellsded2f4c2018-10-20 00:57:57 +010041 seq_puts(m, "USE TTL SV NAME\n");
David Howellsf0691682018-05-18 11:46:14 +010042 return 0;
43 }
44
David Howellsded2f4c2018-10-20 00:57:57 +010045 cell = list_entry(v, struct afs_cell, proc_link);
46 vllist = rcu_dereference(cell->vl_servers);
47
David Howellsf0691682018-05-18 11:46:14 +010048 /* display one cell per line on subsequent lines */
David Howellsded2f4c2018-10-20 00:57:57 +010049 seq_printf(m, "%3u %6lld %2u %s\n",
50 atomic_read(&cell->usage),
51 cell->dns_expiry - ktime_get_real_seconds(),
David Howellsca1cbbd2019-05-07 15:30:34 +010052 vllist->nr_servers,
David Howellsded2f4c2018-10-20 00:57:57 +010053 cell->name);
David Howellsf0691682018-05-18 11:46:14 +010054 return 0;
55}
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
David Howellsfe342cf2018-04-09 21:12:31 +010058 __acquires(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
David Howells989782d2017-11-02 15:27:50 +000060 rcu_read_lock();
David Howells6b3944e2018-10-11 22:45:49 +010061 return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
David Howellsec268152007-04-26 15:49:28 -070062}
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
David Howellsf044c882017-11-02 15:27:45 +000064static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
David Howells6b3944e2018-10-11 22:45:49 +010066 return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
David Howellsec268152007-04-26 15:49:28 -070067}
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
David Howellsf044c882017-11-02 15:27:45 +000069static void afs_proc_cells_stop(struct seq_file *m, void *v)
David Howellsfe342cf2018-04-09 21:12:31 +010070 __releases(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
David Howells989782d2017-11-02 15:27:50 +000072 rcu_read_unlock();
David Howellsec268152007-04-26 15:49:28 -070073}
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
David Howells5d9de252018-05-18 11:46:15 +010075static const struct seq_operations afs_proc_cells_ops = {
76 .start = afs_proc_cells_start,
77 .next = afs_proc_cells_next,
78 .stop = afs_proc_cells_stop,
79 .show = afs_proc_cells_show,
80};
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 * handle writes to /proc/fs/afs/cells
84 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
85 */
David Howells5b86d4f2018-05-18 11:46:15 +010086static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
David Howells5b86d4f2018-05-18 11:46:15 +010088 struct seq_file *m = file->private_data;
89 struct afs_net *net = afs_seq2net(m);
90 char *name, *args;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 int ret;
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 /* trim to first NL */
David Howells5b86d4f2018-05-18 11:46:15 +010094 name = memchr(buf, '\n', size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 if (name)
96 *name = 0;
97
98 /* split into command, name and argslist */
David Howells5b86d4f2018-05-18 11:46:15 +010099 name = strchr(buf, ' ');
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (!name)
101 goto inval;
102 do {
103 *name++ = 0;
104 } while(*name == ' ');
105 if (!*name)
106 goto inval;
107
108 args = strchr(name, ' ');
David Howellsecfe9512018-09-07 23:55:17 +0100109 if (args) {
110 do {
111 *args++ = 0;
112 } while(*args == ' ');
113 if (!*args)
114 goto inval;
115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 /* determine command to perform */
David Howells5b86d4f2018-05-18 11:46:15 +0100118 _debug("cmd=%s name=%s args=%s", buf, name, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
David Howells5b86d4f2018-05-18 11:46:15 +0100120 if (strcmp(buf, "add") == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 struct afs_cell *cell;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
David Howells989782d2017-11-02 15:27:50 +0000123 cell = afs_lookup_cell(net, name, strlen(name), args, true);
David Howells08e0e7c2007-04-26 15:55:03 -0700124 if (IS_ERR(cell)) {
125 ret = PTR_ERR(cell);
126 goto done;
127 }
128
David Howells17814ae2018-04-09 21:12:31 +0100129 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
130 afs_put_cell(net, cell);
David Howellsec268152007-04-26 15:49:28 -0700131 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 goto inval;
133 }
134
David Howells5b86d4f2018-05-18 11:46:15 +0100135 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
David Howellsec268152007-04-26 15:49:28 -0700137done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 _leave(" = %d", ret);
139 return ret;
140
David Howellsec268152007-04-26 15:49:28 -0700141inval:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 ret = -EINVAL;
143 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
144 goto done;
David Howellsec268152007-04-26 15:49:28 -0700145}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
David Howells5d9de252018-05-18 11:46:15 +0100147/*
David Howells5b86d4f2018-05-18 11:46:15 +0100148 * Display the name of the current workstation cell.
David Howells5d9de252018-05-18 11:46:15 +0100149 */
David Howells5b86d4f2018-05-18 11:46:15 +0100150static int afs_proc_rootcell_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
David Howells37ab6362018-04-06 14:17:23 +0100152 struct afs_cell *cell;
David Howells5b86d4f2018-05-18 11:46:15 +0100153 struct afs_net *net;
David Howells37ab6362018-04-06 14:17:23 +0100154
David Howells5b86d4f2018-05-18 11:46:15 +0100155 net = afs_seq2net_single(m);
156 if (rcu_access_pointer(net->ws_cell)) {
157 rcu_read_lock();
158 cell = rcu_dereference(net->ws_cell);
159 if (cell)
160 seq_printf(m, "%s\n", cell->name);
161 rcu_read_unlock();
162 }
163 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166/*
David Howells5d9de252018-05-18 11:46:15 +0100167 * Set the current workstation cell and optionally supply its list of volume
168 * location servers.
169 *
170 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 */
David Howells5b86d4f2018-05-18 11:46:15 +0100172static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
David Howells5b86d4f2018-05-18 11:46:15 +0100174 struct seq_file *m = file->private_data;
175 struct afs_net *net = afs_seq2net_single(m);
176 char *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 int ret;
178
David Howells6f8880d2018-04-09 21:12:31 +0100179 ret = -EINVAL;
David Howells5b86d4f2018-05-18 11:46:15 +0100180 if (buf[0] == '.')
David Howells6f8880d2018-04-09 21:12:31 +0100181 goto out;
David Howells5b86d4f2018-05-18 11:46:15 +0100182 if (memchr(buf, '/', size))
David Howells6f8880d2018-04-09 21:12:31 +0100183 goto out;
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 /* trim to first NL */
David Howells5b86d4f2018-05-18 11:46:15 +0100186 s = memchr(buf, '\n', size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 if (s)
188 *s = 0;
189
190 /* determine command to perform */
David Howells5b86d4f2018-05-18 11:46:15 +0100191 _debug("rootcell=%s", buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
David Howells5b86d4f2018-05-18 11:46:15 +0100193 ret = afs_cell_init(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
David Howells6f8880d2018-04-09 21:12:31 +0100195out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 _leave(" = %d", ret);
197 return ret;
David Howellsec268152007-04-26 15:49:28 -0700198}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
David Howellsf0691682018-05-18 11:46:14 +0100200static const char afs_vol_types[3][3] = {
201 [AFSVL_RWVOL] = "RW",
202 [AFSVL_ROVOL] = "RO",
203 [AFSVL_BACKVOL] = "BK",
204};
205
206/*
David Howells5d9de252018-05-18 11:46:15 +0100207 * Display the list of volumes known to a cell.
David Howellsf0691682018-05-18 11:46:14 +0100208 */
209static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
210{
211 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
212 struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
213
214 /* Display header on line 1 */
215 if (v == &cell->proc_volumes) {
David Howells50559802019-12-11 08:58:59 +0000216 seq_puts(m, "USE VID TY NAME\n");
David Howellsf0691682018-05-18 11:46:14 +0100217 return 0;
218 }
219
David Howells50559802019-12-11 08:58:59 +0000220 seq_printf(m, "%3d %08llx %s %s\n",
David Howellsf0691682018-05-18 11:46:14 +0100221 atomic_read(&vol->usage), vol->vid,
David Howells50559802019-12-11 08:58:59 +0000222 afs_vol_types[vol->type],
223 vol->name);
David Howellsf0691682018-05-18 11:46:14 +0100224
225 return 0;
226}
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
David Howellsfe342cf2018-04-09 21:12:31 +0100229 __acquires(cell->proc_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Christoph Hellwig353861c2018-04-13 20:45:09 +0200231 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
David Howellsd2ddc772017-11-02 15:27:50 +0000233 read_lock(&cell->proc_lock);
234 return seq_list_start_head(&cell->proc_volumes, *_pos);
David Howellsec268152007-04-26 15:49:28 -0700235}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
David Howells5b86d4f2018-05-18 11:46:15 +0100237static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 loff_t *_pos)
239{
David Howells5b86d4f2018-05-18 11:46:15 +0100240 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
David Howellsd2ddc772017-11-02 15:27:50 +0000242 return seq_list_next(v, &cell->proc_volumes, _pos);
David Howellsec268152007-04-26 15:49:28 -0700243}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
David Howells5b86d4f2018-05-18 11:46:15 +0100245static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
David Howellsfe342cf2018-04-09 21:12:31 +0100246 __releases(cell->proc_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
David Howells5b86d4f2018-05-18 11:46:15 +0100248 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
David Howellsd2ddc772017-11-02 15:27:50 +0000250 read_unlock(&cell->proc_lock);
David Howellsec268152007-04-26 15:49:28 -0700251}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
David Howells5d9de252018-05-18 11:46:15 +0100253static const struct seq_operations afs_proc_cell_volumes_ops = {
254 .start = afs_proc_cell_volumes_start,
255 .next = afs_proc_cell_volumes_next,
256 .stop = afs_proc_cell_volumes_stop,
257 .show = afs_proc_cell_volumes_show,
258};
259
David Howells0a5143f2018-10-20 00:57:57 +0100260static const char *const dns_record_sources[NR__dns_record_source + 1] = {
261 [DNS_RECORD_UNAVAILABLE] = "unav",
262 [DNS_RECORD_FROM_CONFIG] = "cfg",
263 [DNS_RECORD_FROM_DNS_A] = "A",
264 [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB",
265 [DNS_RECORD_FROM_DNS_SRV] = "SRV",
266 [DNS_RECORD_FROM_NSS] = "nss",
267 [NR__dns_record_source] = "[weird]"
268};
269
270static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
271 [DNS_LOOKUP_NOT_DONE] = "no-lookup",
272 [DNS_LOOKUP_GOOD] = "good",
273 [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad",
274 [DNS_LOOKUP_BAD] = "bad",
275 [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found",
276 [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure",
277 [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure",
278 [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure",
279 [NR__dns_lookup_status] = "[weird]"
280};
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282/*
David Howells5d9de252018-05-18 11:46:15 +0100283 * Display the list of Volume Location servers we're using for a cell.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 */
David Howellsf0691682018-05-18 11:46:14 +0100285static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
David Howells0a5143f2018-10-20 00:57:57 +0100287 const struct afs_vl_seq_net_private *priv = m->private;
288 const struct afs_vlserver_list *vllist = priv->vllist;
289 const struct afs_vlserver_entry *entry;
290 const struct afs_vlserver *vlserver;
291 const struct afs_addr_list *alist;
292 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
David Howells0a5143f2018-10-20 00:57:57 +0100294 if (v == SEQ_START_TOKEN) {
295 seq_printf(m, "# source %s, status %s\n",
David Howellsca1cbbd2019-05-07 15:30:34 +0100296 dns_record_sources[vllist ? vllist->source : 0],
297 dns_lookup_statuses[vllist ? vllist->status : 0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 return 0;
299 }
300
David Howells0a5143f2018-10-20 00:57:57 +0100301 entry = v;
302 vlserver = entry->server;
303 alist = rcu_dereference(vlserver->addresses);
304
305 seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
306 vlserver->name, entry->priority, entry->weight,
307 dns_record_sources[alist ? alist->source : entry->source],
308 dns_lookup_statuses[alist ? alist->status : entry->status]);
309 if (alist) {
310 for (i = 0; i < alist->nr_addrs; i++)
311 seq_printf(m, " %c %pISpc\n",
David Howells3bf0fb62018-10-20 00:57:59 +0100312 alist->preferred == i ? '>' : '-',
David Howells0a5143f2018-10-20 00:57:57 +0100313 &alist->addrs[i].transport);
314 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 return 0;
David Howellsec268152007-04-26 15:49:28 -0700316}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
David Howellsfe342cf2018-04-09 21:12:31 +0100319 __acquires(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
David Howells0a5143f2018-10-20 00:57:57 +0100321 struct afs_vl_seq_net_private *priv = m->private;
322 struct afs_vlserver_list *vllist;
Christoph Hellwig353861c2018-04-13 20:45:09 +0200323 struct afs_cell *cell = PDE_DATA(file_inode(m->file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 loff_t pos = *_pos;
325
David Howells8b2a4642017-11-02 15:27:50 +0000326 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
David Howells0a5143f2018-10-20 00:57:57 +0100328 vllist = rcu_dereference(cell->vl_servers);
329 priv->vllist = vllist;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
David Howells0a5143f2018-10-20 00:57:57 +0100331 if (pos < 0)
332 *_pos = pos = 0;
333 if (pos == 0)
334 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
David Howellsca1cbbd2019-05-07 15:30:34 +0100336 if (pos - 1 >= vllist->nr_servers)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 return NULL;
338
David Howells0a5143f2018-10-20 00:57:57 +0100339 return &vllist->servers[pos - 1];
David Howellsec268152007-04-26 15:49:28 -0700340}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
David Howells5b86d4f2018-05-18 11:46:15 +0100342static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 loff_t *_pos)
344{
David Howells0a5143f2018-10-20 00:57:57 +0100345 struct afs_vl_seq_net_private *priv = m->private;
346 struct afs_vlserver_list *vllist = priv->vllist;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 loff_t pos;
348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 pos = *_pos;
David Howells0a5143f2018-10-20 00:57:57 +0100350 pos++;
351 *_pos = pos;
352 if (!vllist || pos - 1 >= vllist->nr_servers)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 return NULL;
354
David Howells0a5143f2018-10-20 00:57:57 +0100355 return &vllist->servers[pos - 1];
David Howellsec268152007-04-26 15:49:28 -0700356}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
David Howells5b86d4f2018-05-18 11:46:15 +0100358static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
David Howellsfe342cf2018-04-09 21:12:31 +0100359 __releases(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
David Howells8b2a4642017-11-02 15:27:50 +0000361 rcu_read_unlock();
David Howellsec268152007-04-26 15:49:28 -0700362}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
David Howells5d9de252018-05-18 11:46:15 +0100364static const struct seq_operations afs_proc_cell_vlservers_ops = {
365 .start = afs_proc_cell_vlservers_start,
366 .next = afs_proc_cell_vlservers_next,
367 .stop = afs_proc_cell_vlservers_stop,
368 .show = afs_proc_cell_vlservers_show,
369};
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371/*
David Howells5d9de252018-05-18 11:46:15 +0100372 * Display the list of fileservers we're using within a namespace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 */
David Howellsf0691682018-05-18 11:46:14 +0100374static int afs_proc_servers_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
David Howellsf0691682018-05-18 11:46:14 +0100376 struct afs_server *server;
377 struct afs_addr_list *alist;
David Howells0aac4bce2018-06-02 22:20:31 +0100378 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
David Howellsf0691682018-05-18 11:46:14 +0100380 if (v == SEQ_START_TOKEN) {
David Howells6d043a52020-04-20 22:34:12 +0100381 seq_puts(m, "UUID REF ACT\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return 0;
383 }
384
David Howellsf0691682018-05-18 11:46:14 +0100385 server = list_entry(v, struct afs_server, proc_link);
386 alist = rcu_dereference(server->addresses);
David Howells6d043a52020-04-20 22:34:12 +0100387 seq_printf(m, "%pU %3d %3d\n",
David Howellsf0691682018-05-18 11:46:14 +0100388 &server->uuid,
David Howells977e5f82020-04-17 17:31:26 +0100389 atomic_read(&server->ref),
David Howells6d043a52020-04-20 22:34:12 +0100390 atomic_read(&server->active));
391 seq_printf(m, " - ALIST v=%u osp=%u r=%lx f=%lx\n",
392 alist->version, atomic_read(&server->probe_outstanding),
393 alist->responded, alist->failed);
394 for (i = 0; i < alist->nr_addrs; i++)
395 seq_printf(m, " [%x] %pISpc%s\n",
396 i, &alist->addrs[i].transport,
David Howells3bf0fb62018-10-20 00:57:59 +0100397 alist->preferred == i ? "*" : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return 0;
David Howellsec268152007-04-26 15:49:28 -0700399}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
David Howellsd2ddc772017-11-02 15:27:50 +0000401static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
David Howellsfe342cf2018-04-09 21:12:31 +0100402 __acquires(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
David Howellsd2ddc772017-11-02 15:27:50 +0000404 rcu_read_lock();
David Howells5d9de252018-05-18 11:46:15 +0100405 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
David Howellsec268152007-04-26 15:49:28 -0700406}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
David Howellsd2ddc772017-11-02 15:27:50 +0000408static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409{
David Howells5d9de252018-05-18 11:46:15 +0100410 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
David Howellsec268152007-04-26 15:49:28 -0700411}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
David Howells5b86d4f2018-05-18 11:46:15 +0100413static void afs_proc_servers_stop(struct seq_file *m, void *v)
David Howellsfe342cf2018-04-09 21:12:31 +0100414 __releases(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
David Howellsd2ddc772017-11-02 15:27:50 +0000416 rcu_read_unlock();
David Howellsec268152007-04-26 15:49:28 -0700417}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
David Howells5d9de252018-05-18 11:46:15 +0100419static const struct seq_operations afs_proc_servers_ops = {
420 .start = afs_proc_servers_start,
421 .next = afs_proc_servers_next,
422 .stop = afs_proc_servers_stop,
423 .show = afs_proc_servers_show,
424};
David Howells6f8880d2018-04-09 21:12:31 +0100425
David Howells6f8880d2018-04-09 21:12:31 +0100426/*
David Howells5d9de252018-05-18 11:46:15 +0100427 * Display the list of strings that may be substituted for the @sys pathname
428 * macro.
David Howells6f8880d2018-04-09 21:12:31 +0100429 */
David Howells5d9de252018-05-18 11:46:15 +0100430static int afs_proc_sysname_show(struct seq_file *m, void *v)
David Howells6f8880d2018-04-09 21:12:31 +0100431{
David Howells5d9de252018-05-18 11:46:15 +0100432 struct afs_net *net = afs_seq2net(m);
433 struct afs_sysnames *sysnames = net->sysnames;
434 unsigned int i = (unsigned long)v - 1;
David Howells6f8880d2018-04-09 21:12:31 +0100435
David Howells5d9de252018-05-18 11:46:15 +0100436 if (i < sysnames->nr)
437 seq_printf(m, "%s\n", sysnames->subs[i]);
David Howells6f8880d2018-04-09 21:12:31 +0100438 return 0;
439}
440
David Howells5d9de252018-05-18 11:46:15 +0100441static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
442 __acquires(&net->sysnames_lock)
443{
444 struct afs_net *net = afs_seq2net(m);
David Howells5b86d4f2018-05-18 11:46:15 +0100445 struct afs_sysnames *names;
David Howells5d9de252018-05-18 11:46:15 +0100446
447 read_lock(&net->sysnames_lock);
448
David Howells5b86d4f2018-05-18 11:46:15 +0100449 names = net->sysnames;
David Howells5d9de252018-05-18 11:46:15 +0100450 if (*pos >= names->nr)
451 return NULL;
452 return (void *)(unsigned long)(*pos + 1);
453}
454
455static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
456{
457 struct afs_net *net = afs_seq2net(m);
458 struct afs_sysnames *names = net->sysnames;
459
460 *pos += 1;
461 if (*pos >= names->nr)
462 return NULL;
463 return (void *)(unsigned long)(*pos + 1);
464}
465
466static void afs_proc_sysname_stop(struct seq_file *m, void *v)
467 __releases(&net->sysnames_lock)
468{
469 struct afs_net *net = afs_seq2net(m);
470
471 read_unlock(&net->sysnames_lock);
472}
473
474static const struct seq_operations afs_proc_sysname_ops = {
475 .start = afs_proc_sysname_start,
476 .next = afs_proc_sysname_next,
477 .stop = afs_proc_sysname_stop,
478 .show = afs_proc_sysname_show,
479};
480
David Howells6f8880d2018-04-09 21:12:31 +0100481/*
David Howells5d9de252018-05-18 11:46:15 +0100482 * Allow the @sys substitution to be configured.
David Howells6f8880d2018-04-09 21:12:31 +0100483 */
David Howells5b86d4f2018-05-18 11:46:15 +0100484static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
David Howells6f8880d2018-04-09 21:12:31 +0100485{
David Howells5b86d4f2018-05-18 11:46:15 +0100486 struct afs_sysnames *sysnames, *kill;
David Howells6f8880d2018-04-09 21:12:31 +0100487 struct seq_file *m = file->private_data;
David Howells5b86d4f2018-05-18 11:46:15 +0100488 struct afs_net *net = afs_seq2net(m);
489 char *s, *p, *sub;
David Howells6f8880d2018-04-09 21:12:31 +0100490 int ret, len;
491
David Howells5b86d4f2018-05-18 11:46:15 +0100492 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
David Howells6f8880d2018-04-09 21:12:31 +0100493 if (!sysnames)
David Howells5b86d4f2018-05-18 11:46:15 +0100494 return -ENOMEM;
495 refcount_set(&sysnames->usage, 1);
496 kill = sysnames;
David Howells6f8880d2018-04-09 21:12:31 +0100497
David Howells5b86d4f2018-05-18 11:46:15 +0100498 p = buf;
David Howells6f8880d2018-04-09 21:12:31 +0100499 while ((s = strsep(&p, " \t\n"))) {
500 len = strlen(s);
501 if (len == 0)
502 continue;
503 ret = -ENAMETOOLONG;
504 if (len >= AFSNAMEMAX)
505 goto error;
506
507 if (len >= 4 &&
508 s[len - 4] == '@' &&
509 s[len - 3] == 's' &&
510 s[len - 2] == 'y' &&
511 s[len - 1] == 's')
512 /* Protect against recursion */
513 goto invalid;
514
515 if (s[0] == '.' &&
516 (len < 2 || (len == 2 && s[1] == '.')))
517 goto invalid;
518
519 if (memchr(s, '/', len))
520 goto invalid;
521
522 ret = -EFBIG;
523 if (sysnames->nr >= AFS_NR_SYSNAME)
524 goto out;
525
526 if (strcmp(s, afs_init_sysname) == 0) {
527 sub = (char *)afs_init_sysname;
528 } else {
529 ret = -ENOMEM;
530 sub = kmemdup(s, len + 1, GFP_KERNEL);
531 if (!sub)
532 goto out;
533 }
534
535 sysnames->subs[sysnames->nr] = sub;
536 sysnames->nr++;
537 }
538
David Howells5b86d4f2018-05-18 11:46:15 +0100539 if (sysnames->nr == 0) {
540 sysnames->subs[0] = sysnames->blank;
541 sysnames->nr++;
542 }
543
544 write_lock(&net->sysnames_lock);
545 kill = net->sysnames;
546 net->sysnames = sysnames;
547 write_unlock(&net->sysnames_lock);
548 ret = 0;
David Howells6f8880d2018-04-09 21:12:31 +0100549out:
David Howells5b86d4f2018-05-18 11:46:15 +0100550 afs_put_sysnames(kill);
David Howells6f8880d2018-04-09 21:12:31 +0100551 return ret;
552
553invalid:
554 ret = -EINVAL;
555error:
David Howells6f8880d2018-04-09 21:12:31 +0100556 goto out;
557}
558
David Howells5d9de252018-05-18 11:46:15 +0100559void afs_put_sysnames(struct afs_sysnames *sysnames)
560{
561 int i;
562
563 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
564 for (i = 0; i < sysnames->nr; i++)
565 if (sysnames->subs[i] != afs_init_sysname &&
566 sysnames->subs[i] != sysnames->blank)
567 kfree(sysnames->subs[i]);
568 }
569}
570
David Howellsd55b4da2018-04-06 14:17:24 +0100571/*
572 * Display general per-net namespace statistics
573 */
574static int afs_proc_stats_show(struct seq_file *m, void *v)
575{
David Howells5b86d4f2018-05-18 11:46:15 +0100576 struct afs_net *net = afs_seq2net_single(m);
David Howellsd55b4da2018-04-06 14:17:24 +0100577
578 seq_puts(m, "kAFS statistics\n");
579
David Howellsf3ddee82018-04-06 14:17:25 +0100580 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
David Howellsd55b4da2018-04-06 14:17:24 +0100581 atomic_read(&net->n_lookup),
582 atomic_read(&net->n_reval),
David Howellsf3ddee82018-04-06 14:17:25 +0100583 atomic_read(&net->n_inval),
584 atomic_read(&net->n_relpg));
David Howellsd55b4da2018-04-06 14:17:24 +0100585
586 seq_printf(m, "dir-data: rdpg=%u\n",
587 atomic_read(&net->n_read_dir));
David Howells63a46812018-04-06 14:17:25 +0100588
589 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
590 atomic_read(&net->n_dir_cr),
591 atomic_read(&net->n_dir_rm));
David Howells76a5cb62018-04-06 14:17:26 +0100592
593 seq_printf(m, "file-rd : n=%u nb=%lu\n",
594 atomic_read(&net->n_fetches),
595 atomic_long_read(&net->n_fetch_bytes));
596 seq_printf(m, "file-wr : n=%u nb=%lu\n",
597 atomic_read(&net->n_stores),
598 atomic_long_read(&net->n_store_bytes));
David Howellsd55b4da2018-04-06 14:17:24 +0100599 return 0;
600}
David Howells10495a02018-05-18 11:46:14 +0100601
602/*
603 * initialise /proc/fs/afs/<cell>/
604 */
David Howells5b86d4f2018-05-18 11:46:15 +0100605int afs_proc_cell_setup(struct afs_cell *cell)
David Howells10495a02018-05-18 11:46:14 +0100606{
607 struct proc_dir_entry *dir;
David Howells5b86d4f2018-05-18 11:46:15 +0100608 struct afs_net *net = cell->net;
David Howells10495a02018-05-18 11:46:14 +0100609
610 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
611
David Howells5b86d4f2018-05-18 11:46:15 +0100612 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
David Howells10495a02018-05-18 11:46:14 +0100613 if (!dir)
614 goto error_dir;
615
David Howells5b86d4f2018-05-18 11:46:15 +0100616 if (!proc_create_net_data("vlservers", 0444, dir,
617 &afs_proc_cell_vlservers_ops,
David Howells0a5143f2018-10-20 00:57:57 +0100618 sizeof(struct afs_vl_seq_net_private),
David Howells5b86d4f2018-05-18 11:46:15 +0100619 cell) ||
620 !proc_create_net_data("volumes", 0444, dir,
621 &afs_proc_cell_volumes_ops,
622 sizeof(struct seq_net_private),
623 cell))
David Howells10495a02018-05-18 11:46:14 +0100624 goto error_tree;
625
626 _leave(" = 0");
627 return 0;
628
629error_tree:
630 remove_proc_subtree(cell->name, net->proc_afs);
631error_dir:
632 _leave(" = -ENOMEM");
633 return -ENOMEM;
634}
635
636/*
637 * remove /proc/fs/afs/<cell>/
638 */
David Howells5b86d4f2018-05-18 11:46:15 +0100639void afs_proc_cell_remove(struct afs_cell *cell)
David Howells10495a02018-05-18 11:46:14 +0100640{
David Howells5b86d4f2018-05-18 11:46:15 +0100641 struct afs_net *net = cell->net;
642
David Howells10495a02018-05-18 11:46:14 +0100643 _enter("");
David Howells10495a02018-05-18 11:46:14 +0100644 remove_proc_subtree(cell->name, net->proc_afs);
David Howells10495a02018-05-18 11:46:14 +0100645 _leave("");
646}
647
648/*
649 * initialise the /proc/fs/afs/ directory
650 */
651int afs_proc_init(struct afs_net *net)
652{
David Howells5b86d4f2018-05-18 11:46:15 +0100653 struct proc_dir_entry *p;
654
David Howells10495a02018-05-18 11:46:14 +0100655 _enter("");
656
David Howells5b86d4f2018-05-18 11:46:15 +0100657 p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
658 if (!p)
David Howells10495a02018-05-18 11:46:14 +0100659 goto error_dir;
660
David Howells5b86d4f2018-05-18 11:46:15 +0100661 if (!proc_create_net_data_write("cells", 0644, p,
662 &afs_proc_cells_ops,
663 afs_proc_cells_write,
664 sizeof(struct seq_net_private),
665 NULL) ||
666 !proc_create_net_single_write("rootcell", 0644, p,
667 afs_proc_rootcell_show,
668 afs_proc_rootcell_write,
669 NULL) ||
670 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
671 sizeof(struct seq_net_private)) ||
672 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
673 !proc_create_net_data_write("sysname", 0644, p,
674 &afs_proc_sysname_ops,
675 afs_proc_sysname_write,
676 sizeof(struct seq_net_private),
677 NULL))
David Howells10495a02018-05-18 11:46:14 +0100678 goto error_tree;
679
David Howells5b86d4f2018-05-18 11:46:15 +0100680 net->proc_afs = p;
David Howells10495a02018-05-18 11:46:14 +0100681 _leave(" = 0");
682 return 0;
683
684error_tree:
David Howells5b86d4f2018-05-18 11:46:15 +0100685 proc_remove(p);
David Howells10495a02018-05-18 11:46:14 +0100686error_dir:
687 _leave(" = -ENOMEM");
688 return -ENOMEM;
689}
690
691/*
692 * clean up the /proc/fs/afs/ directory
693 */
694void afs_proc_cleanup(struct afs_net *net)
695{
696 proc_remove(net->proc_afs);
697 net->proc_afs = NULL;
698}