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 <asm/uaccess.h>
  28 #include "cifspdu.h"
  29 #include "cifsglob.h"
  30 #include "cifsproto.h"
  31 #include "cifs_debug.h"
  32 #include "cifsfs.h"
  33
  34 void
  35 cifs_dump_mem(char *label, void *data, int length)
  36 {
  37         int i, j;
  38         int *intptr = data;
  39         char *charptr = data;
  40         char buf[10], line[80];
  41
  42         printk(KERN_DEBUG "%s: dump of %d bytes of data at 0x%p\n",
  43                 label, length, data);
  44         for (i = 0; i < length; i += 16) {
  45                 line[0] = 0;
  46                 for (j = 0; (j < 4) && (i + j * 4 < length); j++) {
  47                         sprintf(buf, " %08x", intptr[i / 4 + j]);
  48                         strcat(line, buf);
  49                 }
  50                 buf[0] = ' ';
  51                 buf[2] = 0;
  52                 for (j = 0; (j < 16) && (i + j < length); j++) {
  53                         buf[1] = isprint(charptr[i + j]) ? charptr[i + j] : '.';
  54                         strcat(line, buf);
  55                 }
  56                 printk(KERN_DEBUG "%s\n", line);
  57         }
  58 }
  59
  60 void cifs_dump_detail(void *buf)
  61 {
  62 #ifdef CONFIG_CIFS_DEBUG2
  63         struct smb_hdr *smb = (struct smb_hdr *)buf;
  64
  65         cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d",
  66                   smb->Command, smb->Status.CifsError,
  67                   smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
  68         cERROR(1, "smb buf %p len %u", smb, smbCalcSize(smb));
  69 #endif /* CONFIG_CIFS_DEBUG2 */
  70 }
  71
  72 void cifs_dump_mids(struct TCP_Server_Info *server)
  73 {
  74 #ifdef CONFIG_CIFS_DEBUG2
  75         struct list_head *tmp;
  76         struct mid_q_entry *mid_entry;
  77
  78         if (server == NULL)
  79                 return;
  80
  81         cERROR(1, "Dump pending requests:");
  82         spin_lock(&GlobalMid_Lock);
  83         list_for_each(tmp, &server->pending_mid_q) {
  84                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
  85                 cERROR(1, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu",
  86                         mid_entry->mid_state,
  87                         le16_to_cpu(mid_entry->command),
  88                         mid_entry->pid,
  89                         mid_entry->callback_data,
  90                         mid_entry->mid);
  91 #ifdef CONFIG_CIFS_STATS2
  92                 cERROR(1, "IsLarge: %d buf: %p time rcv: %ld now: %ld",
  93                         mid_entry->large_buf,
  94                         mid_entry->resp_buf,
  95                         mid_entry->when_received,
  96                         jiffies);
  97 #endif /* STATS2 */
  98                 cERROR(1, "IsMult: %d IsEnd: %d", mid_entry->multiRsp,
  99                           mid_entry->multiEnd);
 100                 if (mid_entry->resp_buf) {
 101                         cifs_dump_detail(mid_entry->resp_buf);
 102                         cifs_dump_mem("existing buf: ",
 103                                 mid_entry->resp_buf, 62);
 104                 }
 105         }
 106         spin_unlock(&GlobalMid_Lock);
 107 #endif /* CONFIG_CIFS_DEBUG2 */
 108 }
 109
 110 #ifdef CONFIG_PROC_FS
 111 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 112 {
 113         struct list_head *tmp1, *tmp2, *tmp3;
 114         struct mid_q_entry *mid_entry;
 115         struct TCP_Server_Info *server;
 116         struct cifs_ses *ses;
 117         struct cifs_tcon *tcon;
 118         int i, j;
 119         __u32 dev_type;
 120
 121         seq_puts(m,
 122                     "Display Internal CIFS Data Structures for Debugging\n"
 123                     "---------------------------------------------------\n");
 124         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 125         seq_printf(m, "Features:");
 126 #ifdef CONFIG_CIFS_DFS_UPCALL
 127         seq_printf(m, " dfs");
 128 #endif
 129 #ifdef CONFIG_CIFS_FSCACHE
 130         seq_printf(m, " fscache");
 131 #endif
 132 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 133         seq_printf(m, " lanman");
 134 #endif
 135 #ifdef CONFIG_CIFS_POSIX
 136         seq_printf(m, " posix");
 137 #endif
 138 #ifdef CONFIG_CIFS_UPCALL
 139         seq_printf(m, " spnego");
 140 #endif
 141 #ifdef CONFIG_CIFS_XATTR
 142         seq_printf(m, " xattr");
 143 #endif
 144 #ifdef CONFIG_CIFS_ACL
 145         seq_printf(m, " acl");
 146 #endif
 147         seq_putc(m, '\n');
 148         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 149         seq_printf(m, "Servers:");
 150
 151         i = 0;
 152         spin_lock(&cifs_tcp_ses_lock);
 153         list_for_each(tmp1, &cifs_tcp_ses_list) {
 154                 server = list_entry(tmp1, struct TCP_Server_Info,
 155                                     tcp_ses_list);
 156                 i++;
 157                 list_for_each(tmp2, &server->smb_ses_list) {
 158                         ses = list_entry(tmp2, struct cifs_ses,
 159                                          smb_ses_list);
 160                         if ((ses->serverDomain == NULL) ||
 161                                 (ses->serverOS == NULL) ||
 162                                 (ses->serverNOS == NULL)) {
 163                                 seq_printf(m, "\n%d) entry for %s not fully "
 164                                            "displayed\n\t", i, ses->serverName);
 165                         } else {
 166                                 seq_printf(m,
 167                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 168                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 169                                     " session status: %d\t",
 170                                 i, ses->serverName, ses->serverDomain,
 171                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 172                                 ses->capabilities, ses->status);
 173                         }
 174                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 175                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 176                                    server->tcpStatus, server->srv_count,
 177                                    server->sec_mode, in_flight(server));
 178
 179 #ifdef CONFIG_CIFS_STATS2
 180                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 181                                 atomic_read(&server->in_send),
 182                                 atomic_read(&server->num_waiters));
 183 #endif
 184
 185                         seq_puts(m, "\n\tShares:");
 186                         j = 0;
 187                         list_for_each(tmp3, &ses->tcon_list) {
 188                                 tcon = list_entry(tmp3, struct cifs_tcon,
 189                                                   tcon_list);
 190                                 ++j;
 191                                 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 192                                 seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
 193                                            tcon->treeName, tcon->tc_count);
 194                                 if (tcon->nativeFileSystem) {
 195                                         seq_printf(m, "Type: %s ",
 196                                                    tcon->nativeFileSystem);
 197                                 }
 198                                 seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
 199                                         "\nPathComponentMax: %d Status: 0x%d",
 200                                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 201                                         le32_to_cpu(tcon->fsAttrInfo.Attributes),
 202                                         le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 203                                         tcon->tidStatus);
 204                                 if (dev_type == FILE_DEVICE_DISK)
 205                                         seq_puts(m, " type: DISK ");
 206                                 else if (dev_type == FILE_DEVICE_CD_ROM)
 207                                         seq_puts(m, " type: CDROM ");
 208                                 else
 209                                         seq_printf(m, " type: %d ", dev_type);
 210
 211                                 if (tcon->need_reconnect)
 212                                         seq_puts(m, "\tDISCONNECTED ");
 213                                 seq_putc(m, '\n');
 214                         }
 215
 216                         seq_puts(m, "\n\tMIDs:\n");
 217
 218                         spin_lock(&GlobalMid_Lock);
 219                         list_for_each(tmp3, &server->pending_mid_q) {
 220                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 221                                         qhead);
 222                                 seq_printf(m, "\tState: %d com: %d pid:"
 223                                               " %d cbdata: %p mid %llu\n",
 224                                               mid_entry->mid_state,
 225                                               le16_to_cpu(mid_entry->command),
 226                                               mid_entry->pid,
 227                                               mid_entry->callback_data,
 228                                               mid_entry->mid);
 229                         }
 230                         spin_unlock(&GlobalMid_Lock);
 231                 }
 232         }
 233         spin_unlock(&cifs_tcp_ses_lock);
 234         seq_putc(m, '\n');
 235
 236         /* BB add code to dump additional info such as TCP session info now */
 237         return 0;
 238 }
 239
 240 static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 241 {
 242         return single_open(file, cifs_debug_data_proc_show, NULL);
 243 }
 244
 245 static const struct file_operations cifs_debug_data_proc_fops = {
 246         .owner          = THIS_MODULE,
 247         .open           = cifs_debug_data_proc_open,
 248         .read           = seq_read,
 249         .llseek         = seq_lseek,
 250         .release        = single_release,
 251 };
 252
 253 #ifdef CONFIG_CIFS_STATS
 254 static ssize_t cifs_stats_proc_write(struct file *file,
 255                 const char __user *buffer, size_t count, loff_t *ppos)
 256 {
 257         char c;
 258         int rc;
 259         struct list_head *tmp1, *tmp2, *tmp3;
 260         struct TCP_Server_Info *server;
 261         struct cifs_ses *ses;
 262         struct cifs_tcon *tcon;
 263
 264         rc = get_user(c, buffer);
 265         if (rc)
 266                 return rc;
 267
 268         if (c == '1' || c == 'y' || c == 'Y' || c == '0') {
 269 #ifdef CONFIG_CIFS_STATS2
 270                 atomic_set(&totBufAllocCount, 0);
 271                 atomic_set(&totSmBufAllocCount, 0);
 272 #endif /* CONFIG_CIFS_STATS2 */
 273                 spin_lock(&cifs_tcp_ses_lock);
 274                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 275                         server = list_entry(tmp1, struct TCP_Server_Info,
 276                                             tcp_ses_list);
 277                         list_for_each(tmp2, &server->smb_ses_list) {
 278                                 ses = list_entry(tmp2, struct cifs_ses,
 279                                                  smb_ses_list);
 280                                 list_for_each(tmp3, &ses->tcon_list) {
 281                                         tcon = list_entry(tmp3,
 282                                                           struct cifs_tcon,
 283                                                           tcon_list);
 284                                         atomic_set(&tcon->num_smbs_sent, 0);
 285                                         if (server->ops->clear_stats)
 286                                                 server->ops->clear_stats(tcon);
 287                                 }
 288                         }
 289                 }
 290                 spin_unlock(&cifs_tcp_ses_lock);
 291         }
 292
 293         return count;
 294 }
 295
 296 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 297 {
 298         int i;
 299         struct list_head *tmp1, *tmp2, *tmp3;
 300         struct TCP_Server_Info *server;
 301         struct cifs_ses *ses;
 302         struct cifs_tcon *tcon;
 303
 304         seq_printf(m,
 305                         "Resources in use\nCIFS Session: %d\n",
 306                         sesInfoAllocCount.counter);
 307         seq_printf(m, "Share (unique mount targets): %d\n",
 308                         tconInfoAllocCount.counter);
 309         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 310                         bufAllocCount.counter,
 311                         cifs_min_rcv + tcpSesAllocCount.counter);
 312         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 313                         smBufAllocCount.counter, cifs_min_small);
 314 #ifdef CONFIG_CIFS_STATS2
 315         seq_printf(m, "Total Large %d Small %d Allocations\n",
 316                                 atomic_read(&totBufAllocCount),
 317                                 atomic_read(&totSmBufAllocCount));
 318 #endif /* CONFIG_CIFS_STATS2 */
 319
 320         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 321         seq_printf(m,
 322                 "\n%d session %d share reconnects\n",
 323                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 324
 325         seq_printf(m,
 326                 "Total vfs operations: %d maximum at one time: %d\n",
 327                 GlobalCurrentXid, GlobalMaxActiveXid);
 328
 329         i = 0;
 330         spin_lock(&cifs_tcp_ses_lock);
 331         list_for_each(tmp1, &cifs_tcp_ses_list) {
 332                 server = list_entry(tmp1, struct TCP_Server_Info,
 333                                     tcp_ses_list);
 334                 list_for_each(tmp2, &server->smb_ses_list) {
 335                         ses = list_entry(tmp2, struct cifs_ses,
 336                                          smb_ses_list);
 337                         list_for_each(tmp3, &ses->tcon_list) {
 338                                 tcon = list_entry(tmp3,
 339                                                   struct cifs_tcon,
 340                                                   tcon_list);
 341                                 i++;
 342                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 343                                 if (tcon->need_reconnect)
 344                                         seq_puts(m, "\tDISCONNECTED ");
 345                                 seq_printf(m, "\nSMBs: %d",
 346                                            atomic_read(&tcon->num_smbs_sent));
 347                                 if (server->ops->print_stats)
 348                                         server->ops->print_stats(m, tcon);
 349                         }
 350                 }
 351         }
 352         spin_unlock(&cifs_tcp_ses_lock);
 353
 354         seq_putc(m, '\n');
 355         return 0;
 356 }
 357
 358 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 359 {
 360         return single_open(file, cifs_stats_proc_show, NULL);
 361 }
 362
 363 static const struct file_operations cifs_stats_proc_fops = {
 364         .owner          = THIS_MODULE,
 365         .open           = cifs_stats_proc_open,
 366         .read           = seq_read,
 367         .llseek         = seq_lseek,
 368         .release        = single_release,
 369         .write          = cifs_stats_proc_write,
 370 };
 371 #endif /* STATS */
 372
 373 static struct proc_dir_entry *proc_fs_cifs;
 374 static const struct file_operations cifsFYI_proc_fops;
 375 static const struct file_operations cifs_lookup_cache_proc_fops;
 376 static const struct file_operations traceSMB_proc_fops;
 377 static const struct file_operations cifs_security_flags_proc_fops;
 378 static const struct file_operations cifs_linux_ext_proc_fops;
 379
 380 void
 381 cifs_proc_init(void)
 382 {
 383         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 384         if (proc_fs_cifs == NULL)
 385                 return;
 386
 387         proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 388
 389 #ifdef CONFIG_CIFS_STATS
 390         proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 391 #endif /* STATS */
 392         proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 393         proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 394         proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 395                     &cifs_linux_ext_proc_fops);
 396         proc_create("SecurityFlags", 0, proc_fs_cifs,
 397                     &cifs_security_flags_proc_fops);
 398         proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 399                     &cifs_lookup_cache_proc_fops);
 400 }
 401
 402 void
 403 cifs_proc_clean(void)
 404 {
 405         if (proc_fs_cifs == NULL)
 406                 return;
 407
 408         remove_proc_entry("DebugData", proc_fs_cifs);
 409         remove_proc_entry("cifsFYI", proc_fs_cifs);
 410         remove_proc_entry("traceSMB", proc_fs_cifs);
 411 #ifdef CONFIG_CIFS_STATS
 412         remove_proc_entry("Stats", proc_fs_cifs);
 413 #endif
 414         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 415         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 416         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 417         remove_proc_entry("fs/cifs", NULL);
 418 }
 419
 420 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 421 {
 422         seq_printf(m, "%d\n", cifsFYI);
 423         return 0;
 424 }
 425
 426 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 427 {
 428         return single_open(file, cifsFYI_proc_show, NULL);
 429 }
 430
 431 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 432                 size_t count, loff_t *ppos)
 433 {
 434         char c;
 435         int rc;
 436
 437         rc = get_user(c, buffer);
 438         if (rc)
 439                 return rc;
 440         if (c == '0' || c == 'n' || c == 'N')
 441                 cifsFYI = 0;
 442         else if (c == '1' || c == 'y' || c == 'Y')
 443                 cifsFYI = 1;
 444         else if ((c > '1') && (c <= '9'))
 445                 cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
 446
 447         return count;
 448 }
 449
 450 static const struct file_operations cifsFYI_proc_fops = {
 451         .owner          = THIS_MODULE,
 452         .open           = cifsFYI_proc_open,
 453         .read           = seq_read,
 454         .llseek         = seq_lseek,
 455         .release        = single_release,
 456         .write          = cifsFYI_proc_write,
 457 };
 458
 459 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 460 {
 461         seq_printf(m, "%d\n", linuxExtEnabled);
 462         return 0;
 463 }
 464
 465 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 466 {
 467         return single_open(file, cifs_linux_ext_proc_show, NULL);
 468 }
 469
 470 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 471                 const char __user *buffer, size_t count, loff_t *ppos)
 472 {
 473         char c;
 474         int rc;
 475
 476         rc = get_user(c, buffer);
 477         if (rc)
 478                 return rc;
 479         if (c == '0' || c == 'n' || c == 'N')
 480                 linuxExtEnabled = 0;
 481         else if (c == '1' || c == 'y' || c == 'Y')
 482                 linuxExtEnabled = 1;
 483
 484         return count;
 485 }
 486
 487 static const struct file_operations cifs_linux_ext_proc_fops = {
 488         .owner          = THIS_MODULE,
 489         .open           = cifs_linux_ext_proc_open,
 490         .read           = seq_read,
 491         .llseek         = seq_lseek,
 492         .release        = single_release,
 493         .write          = cifs_linux_ext_proc_write,
 494 };
 495
 496 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 497 {
 498         seq_printf(m, "%d\n", lookupCacheEnabled);
 499         return 0;
 500 }
 501
 502 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 503 {
 504         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 505 }
 506
 507 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 508                 const char __user *buffer, size_t count, loff_t *ppos)
 509 {
 510         char c;
 511         int rc;
 512
 513         rc = get_user(c, buffer);
 514         if (rc)
 515                 return rc;
 516         if (c == '0' || c == 'n' || c == 'N')
 517                 lookupCacheEnabled = 0;
 518         else if (c == '1' || c == 'y' || c == 'Y')
 519                 lookupCacheEnabled = 1;
 520
 521         return count;
 522 }
 523
 524 static const struct file_operations cifs_lookup_cache_proc_fops = {
 525         .owner          = THIS_MODULE,
 526         .open           = cifs_lookup_cache_proc_open,
 527         .read           = seq_read,
 528         .llseek         = seq_lseek,
 529         .release        = single_release,
 530         .write          = cifs_lookup_cache_proc_write,
 531 };
 532
 533 static int traceSMB_proc_show(struct seq_file *m, void *v)
 534 {
 535         seq_printf(m, "%d\n", traceSMB);
 536         return 0;
 537 }
 538
 539 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 540 {
 541         return single_open(file, traceSMB_proc_show, NULL);
 542 }
 543
 544 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 545                 size_t count, loff_t *ppos)
 546 {
 547         char c;
 548         int rc;
 549
 550         rc = get_user(c, buffer);
 551         if (rc)
 552                 return rc;
 553         if (c == '0' || c == 'n' || c == 'N')
 554                 traceSMB = 0;
 555         else if (c == '1' || c == 'y' || c == 'Y')
 556                 traceSMB = 1;
 557
 558         return count;
 559 }
 560
 561 static const struct file_operations traceSMB_proc_fops = {
 562         .owner          = THIS_MODULE,
 563         .open           = traceSMB_proc_open,
 564         .read           = seq_read,
 565         .llseek         = seq_lseek,
 566         .release        = single_release,
 567         .write          = traceSMB_proc_write,
 568 };
 569
 570 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 571 {
 572         seq_printf(m, "0x%x\n", global_secflags);
 573         return 0;
 574 }
 575
 576 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 577 {
 578         return single_open(file, cifs_security_flags_proc_show, NULL);
 579 }
 580
 581 static ssize_t cifs_security_flags_proc_write(struct file *file,
 582                 const char __user *buffer, size_t count, loff_t *ppos)
 583 {
 584         unsigned int flags;
 585         char flags_string[12];
 586         char c;
 587
 588         if ((count < 1) || (count > 11))
 589                 return -EINVAL;
 590
 591         memset(flags_string, 0, 12);
 592
 593         if (copy_from_user(flags_string, buffer, count))
 594                 return -EFAULT;
 595
 596         if (count < 3) {
 597                 /* single char or single char followed by null */
 598                 c = flags_string[0];
 599                 if (c == '0' || c == 'n' || c == 'N') {
 600                         global_secflags = CIFSSEC_DEF; /* default */
 601                         return count;
 602                 } else if (c == '1' || c == 'y' || c == 'Y') {
 603                         global_secflags = CIFSSEC_MAX;
 604                         return count;
 605                 } else if (!isdigit(c)) {
 606                         cERROR(1, "invalid flag %c", c);
 607                         return -EINVAL;
 608                 }
 609         }
 610         /* else we have a number */
 611
 612         flags = simple_strtoul(flags_string, NULL, 0);
 613
 614         cFYI(1, "sec flags 0x%x", flags);
 615
 616         if (flags <= 0)  {
 617                 cERROR(1, "invalid security flags %s", flags_string);
 618                 return -EINVAL;
 619         }
 620
 621         if (flags & ~CIFSSEC_MASK) {
 622                 cERROR(1, "attempt to set unsupported security flags 0x%x",
 623                         flags & ~CIFSSEC_MASK);
 624                 return -EINVAL;
 625         }
 626         /* flags look ok - update the global security flags for cifs module */
 627         global_secflags = flags;
 628         if (global_secflags & CIFSSEC_MUST_SIGN) {
 629                 /* requiring signing implies signing is allowed */
 630                 global_secflags |= CIFSSEC_MAY_SIGN;
 631                 cFYI(1, "packet signing now required");
 632         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 633                 cFYI(1, "packet signing disabled");
 634         }
 635         /* BB should we turn on MAY flags for other MUST options? */
 636         return count;
 637 }
 638
 639 static const struct file_operations cifs_security_flags_proc_fops = {
 640         .owner          = THIS_MODULE,
 641         .open           = cifs_security_flags_proc_open,
 642         .read           = seq_read,
 643         .llseek         = seq_lseek,
 644         .release        = single_release,
 645         .write          = cifs_security_flags_proc_write,
 646 };
 647 #else
 648 inline void cifs_proc_init(void)
 649 {
 650 }
 651
 652 inline void cifs_proc_clean(void)
 653 {
 654 }
 655 #endif /* PROC_FS */