fs/cifs/cifs_debug.c

   1 /*
   2  *   fs/cifs_debug.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2000,2005
   5  *
   6  *   Modified by Steve French (sfrench@us.ibm.com)
   7  *
   8  *   This program is free software;  you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16  *   the GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program;  if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22 #include <linux/fs.h>
  23 #include <linux/string.h>
  24 #include <linux/ctype.h>
  25 #include <linux/module.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/uaccess.h>
  28 #include "cifspdu.h"
  29 #include "cifsglob.h"
  30 #include "cifsproto.h"
  31 #include "cifs_debug.h"
  32 #include "cifsfs.h"
  33 #ifdef CONFIG_CIFS_SMB_DIRECT
  34 #include "smbdirect.h"
  35 #endif
  36
  37 void
  38 cifs_dump_mem(char *label, void *data, int length)
  39 {
  40         pr_debug("%s: dump of %d bytes of data at 0x%p\n", label, length, data);
  41         print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
  42                        data, length, true);
  43 }
  44
  45 void cifs_dump_detail(void *buf, struct TCP_Server_Info *server)
  46 {
  47 #ifdef CONFIG_CIFS_DEBUG2
  48         struct smb_hdr *smb = (struct smb_hdr *)buf;
  49
  50         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d\n",
  51                  smb->Command, smb->Status.CifsError,
  52                  smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
  53         cifs_dbg(VFS, "smb buf %p len %u\n", smb,
  54                  server->ops->calc_smb_size(smb, server));
  55 #endif /* CONFIG_CIFS_DEBUG2 */
  56 }
  57
  58 void cifs_dump_mids(struct TCP_Server_Info *server)
  59 {
  60 #ifdef CONFIG_CIFS_DEBUG2
  61         struct list_head *tmp;
  62         struct mid_q_entry *mid_entry;
  63
  64         if (server == NULL)
  65                 return;
  66
  67         cifs_dbg(VFS, "Dump pending requests:\n");
  68         spin_lock(&GlobalMid_Lock);
  69         list_for_each(tmp, &server->pending_mid_q) {
  70                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
  71                 cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
  72                          mid_entry->mid_state,
  73                          le16_to_cpu(mid_entry->command),
  74                          mid_entry->pid,
  75                          mid_entry->callback_data,
  76                          mid_entry->mid);
  77 #ifdef CONFIG_CIFS_STATS2
  78                 cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
  79                          mid_entry->large_buf,
  80                          mid_entry->resp_buf,
  81                          mid_entry->when_received,
  82                          jiffies);
  83 #endif /* STATS2 */
  84                 cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
  85                          mid_entry->multiRsp, mid_entry->multiEnd);
  86                 if (mid_entry->resp_buf) {
  87                         cifs_dump_detail(mid_entry->resp_buf, server);
  88                         cifs_dump_mem("existing buf: ",
  89                                 mid_entry->resp_buf, 62);
  90                 }
  91         }
  92         spin_unlock(&GlobalMid_Lock);
  93 #endif /* CONFIG_CIFS_DEBUG2 */
  94 }
  95
  96 #ifdef CONFIG_PROC_FS
  97 static void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
  98 {
  99         __u32 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 100
 101         seq_printf(m, "%s Mounts: %d ", tcon->treeName, tcon->tc_count);
 102         if (tcon->nativeFileSystem)
 103                 seq_printf(m, "Type: %s ", tcon->nativeFileSystem);
 104         seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x\n\tPathComponentMax: %d Status: %d",
 105                    le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 106                    le32_to_cpu(tcon->fsAttrInfo.Attributes),
 107                    le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 108                    tcon->tidStatus);
 109         if (dev_type == FILE_DEVICE_DISK)
 110                 seq_puts(m, " type: DISK ");
 111         else if (dev_type == FILE_DEVICE_CD_ROM)
 112                 seq_puts(m, " type: CDROM ");
 113         else
 114                 seq_printf(m, " type: %d ", dev_type);
 115         if (tcon->seal)
 116                 seq_printf(m, " Encrypted");
 117         if (tcon->nocase)
 118                 seq_printf(m, " nocase");
 119         if (tcon->unix_ext)
 120                 seq_printf(m, " POSIX Extensions");
 121         if (tcon->ses->server->ops->dump_share_caps)
 122                 tcon->ses->server->ops->dump_share_caps(m, tcon);
 123
 124         if (tcon->need_reconnect)
 125                 seq_puts(m, "\tDISCONNECTED ");
 126         seq_putc(m, '\n');
 127 }
 128
 129 static void
 130 cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
 131 {
 132         struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
 133         struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
 134
 135         seq_printf(m, "\t\tSpeed: %zu bps\n", iface->speed);
 136         seq_puts(m, "\t\tCapabilities: ");
 137         if (iface->rdma_capable)
 138                 seq_puts(m, "rdma ");
 139         if (iface->rss_capable)
 140                 seq_puts(m, "rss ");
 141         seq_putc(m, '\n');
 142         if (iface->sockaddr.ss_family == AF_INET)
 143                 seq_printf(m, "\t\tIPv4: %pI4\n", &ipv4->sin_addr);
 144         else if (iface->sockaddr.ss_family == AF_INET6)
 145                 seq_printf(m, "\t\tIPv6: %pI6\n", &ipv6->sin6_addr);
 146 }
 147
 148 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 149 {
 150         struct list_head *tmp1, *tmp2, *tmp3;
 151         struct mid_q_entry *mid_entry;
 152         struct TCP_Server_Info *server;
 153         struct cifs_ses *ses;
 154         struct cifs_tcon *tcon;
 155         int i, j;
 156
 157         seq_puts(m,
 158                     "Display Internal CIFS Data Structures for Debugging\n"
 159                     "---------------------------------------------------\n");
 160         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 161         seq_printf(m, "Features:");
 162 #ifdef CONFIG_CIFS_DFS_UPCALL
 163         seq_printf(m, " dfs");
 164 #endif
 165 #ifdef CONFIG_CIFS_FSCACHE
 166         seq_printf(m, " fscache");
 167 #endif
 168 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 169         seq_printf(m, " lanman");
 170 #endif
 171 #ifdef CONFIG_CIFS_POSIX
 172         seq_printf(m, " posix");
 173 #endif
 174 #ifdef CONFIG_CIFS_UPCALL
 175         seq_printf(m, " spnego");
 176 #endif
 177 #ifdef CONFIG_CIFS_XATTR
 178         seq_printf(m, " xattr");
 179 #endif
 180 #ifdef CONFIG_CIFS_ACL
 181         seq_printf(m, " acl");
 182 #endif
 183         seq_putc(m, '\n');
 184         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 185         seq_printf(m, "Servers:");
 186
 187         i = 0;
 188         spin_lock(&cifs_tcp_ses_lock);
 189         list_for_each(tmp1, &cifs_tcp_ses_list) {
 190                 server = list_entry(tmp1, struct TCP_Server_Info,
 191                                     tcp_ses_list);
 192
 193 #ifdef CONFIG_CIFS_SMB_DIRECT
 194                 if (!server->rdma)
 195                         goto skip_rdma;
 196
 197                 seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
 198                         "transport status: %x",
 199                         server->smbd_conn->protocol,
 200                         server->smbd_conn->transport_status);
 201                 seq_printf(m, "\nConn receive_credit_max: %x "
 202                         "send_credit_target: %x max_send_size: %x",
 203                         server->smbd_conn->receive_credit_max,
 204                         server->smbd_conn->send_credit_target,
 205                         server->smbd_conn->max_send_size);
 206                 seq_printf(m, "\nConn max_fragmented_recv_size: %x "
 207                         "max_fragmented_send_size: %x max_receive_size:%x",
 208                         server->smbd_conn->max_fragmented_recv_size,
 209                         server->smbd_conn->max_fragmented_send_size,
 210                         server->smbd_conn->max_receive_size);
 211                 seq_printf(m, "\nConn keep_alive_interval: %x "
 212                         "max_readwrite_size: %x rdma_readwrite_threshold: %x",
 213                         server->smbd_conn->keep_alive_interval,
 214                         server->smbd_conn->max_readwrite_size,
 215                         server->smbd_conn->rdma_readwrite_threshold);
 216                 seq_printf(m, "\nDebug count_get_receive_buffer: %x "
 217                         "count_put_receive_buffer: %x count_send_empty: %x",
 218                         server->smbd_conn->count_get_receive_buffer,
 219                         server->smbd_conn->count_put_receive_buffer,
 220                         server->smbd_conn->count_send_empty);
 221                 seq_printf(m, "\nRead Queue count_reassembly_queue: %x "
 222                         "count_enqueue_reassembly_queue: %x "
 223                         "count_dequeue_reassembly_queue: %x "
 224                         "fragment_reassembly_remaining: %x "
 225                         "reassembly_data_length: %x "
 226                         "reassembly_queue_length: %x",
 227                         server->smbd_conn->count_reassembly_queue,
 228                         server->smbd_conn->count_enqueue_reassembly_queue,
 229                         server->smbd_conn->count_dequeue_reassembly_queue,
 230                         server->smbd_conn->fragment_reassembly_remaining,
 231                         server->smbd_conn->reassembly_data_length,
 232                         server->smbd_conn->reassembly_queue_length);
 233                 seq_printf(m, "\nCurrent Credits send_credits: %x "
 234                         "receive_credits: %x receive_credit_target: %x",
 235                         atomic_read(&server->smbd_conn->send_credits),
 236                         atomic_read(&server->smbd_conn->receive_credits),
 237                         server->smbd_conn->receive_credit_target);
 238                 seq_printf(m, "\nPending send_pending: %x send_payload_pending:"
 239                         " %x smbd_send_pending: %x smbd_recv_pending: %x",
 240                         atomic_read(&server->smbd_conn->send_pending),
 241                         atomic_read(&server->smbd_conn->send_payload_pending),
 242                         server->smbd_conn->smbd_send_pending,
 243                         server->smbd_conn->smbd_recv_pending);
 244                 seq_printf(m, "\nReceive buffers count_receive_queue: %x "
 245                         "count_empty_packet_queue: %x",
 246                         server->smbd_conn->count_receive_queue,
 247                         server->smbd_conn->count_empty_packet_queue);
 248                 seq_printf(m, "\nMR responder_resources: %x "
 249                         "max_frmr_depth: %x mr_type: %x",
 250                         server->smbd_conn->responder_resources,
 251                         server->smbd_conn->max_frmr_depth,
 252                         server->smbd_conn->mr_type);
 253                 seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
 254                         atomic_read(&server->smbd_conn->mr_ready_count),
 255                         atomic_read(&server->smbd_conn->mr_used_count));
 256 skip_rdma:
 257 #endif
 258                 seq_printf(m, "\nNumber of credits: %d Dialect 0x%x",
 259                         server->credits,  server->dialect);
 260                 if (server->sign)
 261                         seq_printf(m, " signed");
 262 #ifdef CONFIG_CIFS_SMB311
 263                 if (server->posix_ext_supported)
 264                         seq_printf(m, " posix");
 265 #endif /* 3.1.1 */
 266                 i++;
 267                 list_for_each(tmp2, &server->smb_ses_list) {
 268                         ses = list_entry(tmp2, struct cifs_ses,
 269                                          smb_ses_list);
 270                         if ((ses->serverDomain == NULL) ||
 271                                 (ses->serverOS == NULL) ||
 272                                 (ses->serverNOS == NULL)) {
 273                                 seq_printf(m, "\n%d) Name: %s Uses: %d Capability: 0x%x\tSession Status: %d\t",
 274                                         i, ses->serverName, ses->ses_count,
 275                                         ses->capabilities, ses->status);
 276                                 if (ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 277                                         seq_printf(m, "Guest\t");
 278                                 else if (ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 279                                         seq_printf(m, "Anonymous\t");
 280                         } else {
 281                                 seq_printf(m,
 282                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 283                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 284                                     " session status: %d\t",
 285                                 i, ses->serverName, ses->serverDomain,
 286                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 287                                 ses->capabilities, ses->status);
 288                         }
 289                         if (server->rdma)
 290                                 seq_printf(m, "RDMA\n\t");
 291                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 292                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 293                                    server->tcpStatus, server->srv_count,
 294                                    server->sec_mode, in_flight(server));
 295
 296 #ifdef CONFIG_CIFS_STATS2
 297                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 298                                 atomic_read(&server->in_send),
 299                                 atomic_read(&server->num_waiters));
 300 #endif
 301
 302                         seq_puts(m, "\n\tShares:");
 303                         j = 0;
 304
 305                         seq_printf(m, "\n\t%d) IPC: ", j);
 306                         if (ses->tcon_ipc)
 307                                 cifs_debug_tcon(m, ses->tcon_ipc);
 308                         else
 309                                 seq_puts(m, "none\n");
 310
 311                         list_for_each(tmp3, &ses->tcon_list) {
 312                                 tcon = list_entry(tmp3, struct cifs_tcon,
 313                                                   tcon_list);
 314                                 ++j;
 315                                 seq_printf(m, "\n\t%d) ", j);
 316                                 cifs_debug_tcon(m, tcon);
 317                         }
 318
 319                         seq_puts(m, "\n\tMIDs:\n");
 320
 321                         spin_lock(&GlobalMid_Lock);
 322                         list_for_each(tmp3, &server->pending_mid_q) {
 323                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 324                                         qhead);
 325                                 seq_printf(m, "\tState: %d com: %d pid:"
 326                                               " %d cbdata: %p mid %llu\n",
 327                                               mid_entry->mid_state,
 328                                               le16_to_cpu(mid_entry->command),
 329                                               mid_entry->pid,
 330                                               mid_entry->callback_data,
 331                                               mid_entry->mid);
 332                         }
 333                         spin_unlock(&GlobalMid_Lock);
 334
 335                         spin_lock(&ses->iface_lock);
 336                         if (ses->iface_count)
 337                                 seq_printf(m, "\n\tServer interfaces: %zu\n",
 338                                            ses->iface_count);
 339                         for (j = 0; j < ses->iface_count; j++) {
 340                                 seq_printf(m, "\t%d)\n", j);
 341                                 cifs_dump_iface(m, &ses->iface_list[j]);
 342                         }
 343                         spin_unlock(&ses->iface_lock);
 344                 }
 345         }
 346         spin_unlock(&cifs_tcp_ses_lock);
 347         seq_putc(m, '\n');
 348
 349         /* BB add code to dump additional info such as TCP session info now */
 350         return 0;
 351 }
 352
 353 #ifdef CONFIG_CIFS_STATS
 354 static ssize_t cifs_stats_proc_write(struct file *file,
 355                 const char __user *buffer, size_t count, loff_t *ppos)
 356 {
 357         bool bv;
 358         int rc;
 359         struct list_head *tmp1, *tmp2, *tmp3;
 360         struct TCP_Server_Info *server;
 361         struct cifs_ses *ses;
 362         struct cifs_tcon *tcon;
 363
 364         rc = kstrtobool_from_user(buffer, count, &bv);
 365         if (rc == 0) {
 366 #ifdef CONFIG_CIFS_STATS2
 367                 atomic_set(&totBufAllocCount, 0);
 368                 atomic_set(&totSmBufAllocCount, 0);
 369 #endif /* CONFIG_CIFS_STATS2 */
 370                 spin_lock(&cifs_tcp_ses_lock);
 371                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 372                         server = list_entry(tmp1, struct TCP_Server_Info,
 373                                             tcp_ses_list);
 374                         list_for_each(tmp2, &server->smb_ses_list) {
 375                                 ses = list_entry(tmp2, struct cifs_ses,
 376                                                  smb_ses_list);
 377                                 list_for_each(tmp3, &ses->tcon_list) {
 378                                         tcon = list_entry(tmp3,
 379                                                           struct cifs_tcon,
 380                                                           tcon_list);
 381                                         atomic_set(&tcon->num_smbs_sent, 0);
 382                                         if (server->ops->clear_stats)
 383                                                 server->ops->clear_stats(tcon);
 384                                 }
 385                         }
 386                 }
 387                 spin_unlock(&cifs_tcp_ses_lock);
 388         } else {
 389                 return rc;
 390         }
 391
 392         return count;
 393 }
 394
 395 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 396 {
 397         int i;
 398         struct list_head *tmp1, *tmp2, *tmp3;
 399         struct TCP_Server_Info *server;
 400         struct cifs_ses *ses;
 401         struct cifs_tcon *tcon;
 402
 403         seq_printf(m,
 404                         "Resources in use\nCIFS Session: %d\n",
 405                         sesInfoAllocCount.counter);
 406         seq_printf(m, "Share (unique mount targets): %d\n",
 407                         tconInfoAllocCount.counter);
 408         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 409                         bufAllocCount.counter,
 410                         cifs_min_rcv + tcpSesAllocCount.counter);
 411         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 412                         smBufAllocCount.counter, cifs_min_small);
 413 #ifdef CONFIG_CIFS_STATS2
 414         seq_printf(m, "Total Large %d Small %d Allocations\n",
 415                                 atomic_read(&totBufAllocCount),
 416                                 atomic_read(&totSmBufAllocCount));
 417 #endif /* CONFIG_CIFS_STATS2 */
 418
 419         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 420         seq_printf(m,
 421                 "\n%d session %d share reconnects\n",
 422                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 423
 424         seq_printf(m,
 425                 "Total vfs operations: %d maximum at one time: %d\n",
 426                 GlobalCurrentXid, GlobalMaxActiveXid);
 427
 428         i = 0;
 429         spin_lock(&cifs_tcp_ses_lock);
 430         list_for_each(tmp1, &cifs_tcp_ses_list) {
 431                 server = list_entry(tmp1, struct TCP_Server_Info,
 432                                     tcp_ses_list);
 433                 list_for_each(tmp2, &server->smb_ses_list) {
 434                         ses = list_entry(tmp2, struct cifs_ses,
 435                                          smb_ses_list);
 436                         list_for_each(tmp3, &ses->tcon_list) {
 437                                 tcon = list_entry(tmp3,
 438                                                   struct cifs_tcon,
 439                                                   tcon_list);
 440                                 i++;
 441                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 442                                 if (tcon->need_reconnect)
 443                                         seq_puts(m, "\tDISCONNECTED ");
 444                                 seq_printf(m, "\nSMBs: %d",
 445                                            atomic_read(&tcon->num_smbs_sent));
 446                                 if (server->ops->print_stats)
 447                                         server->ops->print_stats(m, tcon);
 448                         }
 449                 }
 450         }
 451         spin_unlock(&cifs_tcp_ses_lock);
 452
 453         seq_putc(m, '\n');
 454         return 0;
 455 }
 456
 457 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 458 {
 459         return single_open(file, cifs_stats_proc_show, NULL);
 460 }
 461
 462 static const struct file_operations cifs_stats_proc_fops = {
 463         .open           = cifs_stats_proc_open,
 464         .read           = seq_read,
 465         .llseek         = seq_lseek,
 466         .release        = single_release,
 467         .write          = cifs_stats_proc_write,
 468 };
 469 #endif /* STATS */
 470
 471 #ifdef CONFIG_CIFS_SMB_DIRECT
 472 #define PROC_FILE_DEFINE(name) \
 473 static ssize_t name##_write(struct file *file, const char __user *buffer, \
 474         size_t count, loff_t *ppos) \
 475 { \
 476         int rc; \
 477         rc = kstrtoint_from_user(buffer, count, 10, & name); \
 478         if (rc) \
 479                 return rc; \
 480         return count; \
 481 } \
 482 static int name##_proc_show(struct seq_file *m, void *v) \
 483 { \
 484         seq_printf(m, "%d\n", name ); \
 485         return 0; \
 486 } \
 487 static int name##_open(struct inode *inode, struct file *file) \
 488 { \
 489         return single_open(file, name##_proc_show, NULL); \
 490 } \
 491 \
 492 static const struct file_operations cifs_##name##_proc_fops = { \
 493         .open           = name##_open, \
 494         .read           = seq_read, \
 495         .llseek         = seq_lseek, \
 496         .release        = single_release, \
 497         .write          = name##_write, \
 498 }
 499
 500 PROC_FILE_DEFINE(rdma_readwrite_threshold);
 501 PROC_FILE_DEFINE(smbd_max_frmr_depth);
 502 PROC_FILE_DEFINE(smbd_keep_alive_interval);
 503 PROC_FILE_DEFINE(smbd_max_receive_size);
 504 PROC_FILE_DEFINE(smbd_max_fragmented_recv_size);
 505 PROC_FILE_DEFINE(smbd_max_send_size);
 506 PROC_FILE_DEFINE(smbd_send_credit_target);
 507 PROC_FILE_DEFINE(smbd_receive_credit_max);
 508 #endif
 509
 510 static struct proc_dir_entry *proc_fs_cifs;
 511 static const struct file_operations cifsFYI_proc_fops;
 512 static const struct file_operations cifs_lookup_cache_proc_fops;
 513 static const struct file_operations traceSMB_proc_fops;
 514 static const struct file_operations cifs_security_flags_proc_fops;
 515 static const struct file_operations cifs_linux_ext_proc_fops;
 516
 517 void
 518 cifs_proc_init(void)
 519 {
 520         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 521         if (proc_fs_cifs == NULL)
 522                 return;
 523
 524         proc_create_single("DebugData", 0, proc_fs_cifs,
 525                         cifs_debug_data_proc_show);
 526
 527 #ifdef CONFIG_CIFS_STATS
 528         proc_create("Stats", 0644, proc_fs_cifs, &cifs_stats_proc_fops);
 529 #endif /* STATS */
 530         proc_create("cifsFYI", 0644, proc_fs_cifs, &cifsFYI_proc_fops);
 531         proc_create("traceSMB", 0644, proc_fs_cifs, &traceSMB_proc_fops);
 532         proc_create("LinuxExtensionsEnabled", 0644, proc_fs_cifs,
 533                     &cifs_linux_ext_proc_fops);
 534         proc_create("SecurityFlags", 0644, proc_fs_cifs,
 535                     &cifs_security_flags_proc_fops);
 536         proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,
 537                     &cifs_lookup_cache_proc_fops);
 538 #ifdef CONFIG_CIFS_SMB_DIRECT
 539         proc_create("rdma_readwrite_threshold", 0644, proc_fs_cifs,
 540                 &cifs_rdma_readwrite_threshold_proc_fops);
 541         proc_create("smbd_max_frmr_depth", 0644, proc_fs_cifs,
 542                 &cifs_smbd_max_frmr_depth_proc_fops);
 543         proc_create("smbd_keep_alive_interval", 0644, proc_fs_cifs,
 544                 &cifs_smbd_keep_alive_interval_proc_fops);
 545         proc_create("smbd_max_receive_size", 0644, proc_fs_cifs,
 546                 &cifs_smbd_max_receive_size_proc_fops);
 547         proc_create("smbd_max_fragmented_recv_size", 0644, proc_fs_cifs,
 548                 &cifs_smbd_max_fragmented_recv_size_proc_fops);
 549         proc_create("smbd_max_send_size", 0644, proc_fs_cifs,
 550                 &cifs_smbd_max_send_size_proc_fops);
 551         proc_create("smbd_send_credit_target", 0644, proc_fs_cifs,
 552                 &cifs_smbd_send_credit_target_proc_fops);
 553         proc_create("smbd_receive_credit_max", 0644, proc_fs_cifs,
 554                 &cifs_smbd_receive_credit_max_proc_fops);
 555 #endif
 556 }
 557
 558 void
 559 cifs_proc_clean(void)
 560 {
 561         if (proc_fs_cifs == NULL)
 562                 return;
 563
 564         remove_proc_entry("DebugData", proc_fs_cifs);
 565         remove_proc_entry("cifsFYI", proc_fs_cifs);
 566         remove_proc_entry("traceSMB", proc_fs_cifs);
 567 #ifdef CONFIG_CIFS_STATS
 568         remove_proc_entry("Stats", proc_fs_cifs);
 569 #endif
 570         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 571         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 572         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 573 #ifdef CONFIG_CIFS_SMB_DIRECT
 574         remove_proc_entry("rdma_readwrite_threshold", proc_fs_cifs);
 575         remove_proc_entry("smbd_max_frmr_depth", proc_fs_cifs);
 576         remove_proc_entry("smbd_keep_alive_interval", proc_fs_cifs);
 577         remove_proc_entry("smbd_max_receive_size", proc_fs_cifs);
 578         remove_proc_entry("smbd_max_fragmented_recv_size", proc_fs_cifs);
 579         remove_proc_entry("smbd_max_send_size", proc_fs_cifs);
 580         remove_proc_entry("smbd_send_credit_target", proc_fs_cifs);
 581         remove_proc_entry("smbd_receive_credit_max", proc_fs_cifs);
 582 #endif
 583         remove_proc_entry("fs/cifs", NULL);
 584 }
 585
 586 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 587 {
 588         seq_printf(m, "%d\n", cifsFYI);
 589         return 0;
 590 }
 591
 592 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 593 {
 594         return single_open(file, cifsFYI_proc_show, NULL);
 595 }
 596
 597 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 598                 size_t count, loff_t *ppos)
 599 {
 600         char c[2] = { '\0' };
 601         bool bv;
 602         int rc;
 603
 604         rc = get_user(c[0], buffer);
 605         if (rc)
 606                 return rc;
 607         if (strtobool(c, &bv) == 0)
 608                 cifsFYI = bv;
 609         else if ((c[0] > '1') && (c[0] <= '9'))
 610                 cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
 611         else
 612                 return -EINVAL;
 613
 614         return count;
 615 }
 616
 617 static const struct file_operations cifsFYI_proc_fops = {
 618         .open           = cifsFYI_proc_open,
 619         .read           = seq_read,
 620         .llseek         = seq_lseek,
 621         .release        = single_release,
 622         .write          = cifsFYI_proc_write,
 623 };
 624
 625 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 626 {
 627         seq_printf(m, "%d\n", linuxExtEnabled);
 628         return 0;
 629 }
 630
 631 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 632 {
 633         return single_open(file, cifs_linux_ext_proc_show, NULL);
 634 }
 635
 636 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 637                 const char __user *buffer, size_t count, loff_t *ppos)
 638 {
 639         int rc;
 640
 641         rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
 642         if (rc)
 643                 return rc;
 644
 645         return count;
 646 }
 647
 648 static const struct file_operations cifs_linux_ext_proc_fops = {
 649         .open           = cifs_linux_ext_proc_open,
 650         .read           = seq_read,
 651         .llseek         = seq_lseek,
 652         .release        = single_release,
 653         .write          = cifs_linux_ext_proc_write,
 654 };
 655
 656 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 657 {
 658         seq_printf(m, "%d\n", lookupCacheEnabled);
 659         return 0;
 660 }
 661
 662 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 663 {
 664         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 665 }
 666
 667 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 668                 const char __user *buffer, size_t count, loff_t *ppos)
 669 {
 670         int rc;
 671
 672         rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
 673         if (rc)
 674                 return rc;
 675
 676         return count;
 677 }
 678
 679 static const struct file_operations cifs_lookup_cache_proc_fops = {
 680         .open           = cifs_lookup_cache_proc_open,
 681         .read           = seq_read,
 682         .llseek         = seq_lseek,
 683         .release        = single_release,
 684         .write          = cifs_lookup_cache_proc_write,
 685 };
 686
 687 static int traceSMB_proc_show(struct seq_file *m, void *v)
 688 {
 689         seq_printf(m, "%d\n", traceSMB);
 690         return 0;
 691 }
 692
 693 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 694 {
 695         return single_open(file, traceSMB_proc_show, NULL);
 696 }
 697
 698 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 699                 size_t count, loff_t *ppos)
 700 {
 701         int rc;
 702
 703         rc = kstrtobool_from_user(buffer, count, &traceSMB);
 704         if (rc)
 705                 return rc;
 706
 707         return count;
 708 }
 709
 710 static const struct file_operations traceSMB_proc_fops = {
 711         .open           = traceSMB_proc_open,
 712         .read           = seq_read,
 713         .llseek         = seq_lseek,
 714         .release        = single_release,
 715         .write          = traceSMB_proc_write,
 716 };
 717
 718 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 719 {
 720         seq_printf(m, "0x%x\n", global_secflags);
 721         return 0;
 722 }
 723
 724 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 725 {
 726         return single_open(file, cifs_security_flags_proc_show, NULL);
 727 }
 728
 729 /*
 730  * Ensure that if someone sets a MUST flag, that we disable all other MAY
 731  * flags except for the ones corresponding to the given MUST flag. If there are
 732  * multiple MUST flags, then try to prefer more secure ones.
 733  */
 734 static void
 735 cifs_security_flags_handle_must_flags(unsigned int *flags)
 736 {
 737         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
 738
 739         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
 740                 *flags = CIFSSEC_MUST_KRB5;
 741         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
 742                 *flags = CIFSSEC_MUST_NTLMSSP;
 743         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 744                 *flags = CIFSSEC_MUST_NTLMV2;
 745         else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
 746                 *flags = CIFSSEC_MUST_NTLM;
 747         else if (CIFSSEC_MUST_LANMAN &&
 748                  (*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
 749                 *flags = CIFSSEC_MUST_LANMAN;
 750         else if (CIFSSEC_MUST_PLNTXT &&
 751                  (*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
 752                 *flags = CIFSSEC_MUST_PLNTXT;
 753
 754         *flags |= signflags;
 755 }
 756
 757 static ssize_t cifs_security_flags_proc_write(struct file *file,
 758                 const char __user *buffer, size_t count, loff_t *ppos)
 759 {
 760         int rc;
 761         unsigned int flags;
 762         char flags_string[12];
 763         bool bv;
 764
 765         if ((count < 1) || (count > 11))
 766                 return -EINVAL;
 767
 768         memset(flags_string, 0, 12);
 769
 770         if (copy_from_user(flags_string, buffer, count))
 771                 return -EFAULT;
 772
 773         if (count < 3) {
 774                 /* single char or single char followed by null */
 775                 if (strtobool(flags_string, &bv) == 0) {
 776                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
 777                         return count;
 778                 } else if (!isdigit(flags_string[0])) {
 779                         cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 780                                         flags_string);
 781                         return -EINVAL;
 782                 }
 783         }
 784
 785         /* else we have a number */
 786         rc = kstrtouint(flags_string, 0, &flags);
 787         if (rc) {
 788                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 789                                 flags_string);
 790                 return rc;
 791         }
 792
 793         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
 794
 795         if (flags == 0)  {
 796                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
 797                 return -EINVAL;
 798         }
 799
 800         if (flags & ~CIFSSEC_MASK) {
 801                 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
 802                          flags & ~CIFSSEC_MASK);
 803                 return -EINVAL;
 804         }
 805
 806         cifs_security_flags_handle_must_flags(&flags);
 807
 808         /* flags look ok - update the global security flags for cifs module */
 809         global_secflags = flags;
 810         if (global_secflags & CIFSSEC_MUST_SIGN) {
 811                 /* requiring signing implies signing is allowed */
 812                 global_secflags |= CIFSSEC_MAY_SIGN;
 813                 cifs_dbg(FYI, "packet signing now required\n");
 814         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 815                 cifs_dbg(FYI, "packet signing disabled\n");
 816         }
 817         /* BB should we turn on MAY flags for other MUST options? */
 818         return count;
 819 }
 820
 821 static const struct file_operations cifs_security_flags_proc_fops = {
 822         .open           = cifs_security_flags_proc_open,
 823         .read           = seq_read,
 824         .llseek         = seq_lseek,
 825         .release        = single_release,
 826         .write          = cifs_security_flags_proc_write,
 827 };
 828 #else
 829 inline void cifs_proc_init(void)
 830 {
 831 }
 832
 833 inline void cifs_proc_clean(void)
 834 {
 835 }
 836 #endif /* PROC_FS */