fs/afs/proc.c

   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                 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
 194 out:
 195         rcu_read_unlock();
 196         return 0;
 197 }
 198
 199 /*
 200  * Display the name of the current workstation cell.
 201  */
 202 static 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  */
 222 static 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
 245 out:
 246         _leave(" = %d", ret);
 247         return ret;
 248 }
 249
 250 static 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  */
 259 static 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
 277 static 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
 286 static 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
 294 static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
 295         __releases(cell->proc_lock)
 296 {
 297         rcu_read_unlock();
 298 }
 299
 300 static 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
 307 static 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
 317 static 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  */
 332 static 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
 370 static 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
 394 static 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
 410 static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
 411         __releases(rcu)
 412 {
 413         rcu_read_unlock();
 414 }
 415
 416 static 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  */
 426 static 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
 470 static 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
 477 static 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
 482 static void afs_proc_servers_stop(struct seq_file *m, void *v)
 483         __releases(rcu)
 484 {
 485         rcu_read_unlock();
 486 }
 487
 488 static 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  */
 499 static 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
 510 static 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
 524 static 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
 535 static 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
 543 static 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  */
 553 static 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;
 618 out:
 619         afs_put_sysnames(kill);
 620         return ret;
 621
 622 invalid:
 623         ret = -EINVAL;
 624 error:
 625         goto out;
 626 }
 627
 628 void 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  */
 644 static 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  */
 675 int 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
 699 error_tree:
 700         remove_proc_subtree(cell->name, net->proc_afs);
 701 error_dir:
 702         _leave(" = -ENOMEM");
 703         return -ENOMEM;
 704 }
 705
 706 /*
 707  * remove /proc/fs/afs/<cell>/
 708  */
 709 void 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  */
 721 int 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
 758 error_tree:
 759         proc_remove(p);
 760 error_dir:
 761         _leave(" = -ENOMEM");
 762         return -ENOMEM;
 763 }
 764
 765 /*
 766  * clean up the /proc/fs/afs/ directory
 767  */
 768 void afs_proc_cleanup(struct afs_net *net)
 769 {
 770         proc_remove(net->proc_afs);
 771         net->proc_afs = NULL;
 772 }