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 #ifdef CONFIG_CIFS_DEBUG
  61 void cifs_vfs_err(const char *fmt, ...)
  62 {
  63         struct va_format vaf;
  64         va_list args;
  65
  66         va_start(args, fmt);
  67
  68         vaf.fmt = fmt;
  69         vaf.va = &args;
  70
  71         printk(KERN_ERR "CIFS VFS: %pV", &vaf);
  72
  73         va_end(args);
  74 }
  75 #endif
  76
  77 void cifs_dump_detail(void *buf)
  78 {
  79 #ifdef CONFIG_CIFS_DEBUG2
  80         struct smb_hdr *smb = (struct smb_hdr *)buf;
  81
  82         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d\n",
  83                  smb->Command, smb->Status.CifsError,
  84                  smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
  85         cifs_dbg(VFS, "smb buf %p len %u\n", smb, smbCalcSize(smb));
  86 #endif /* CONFIG_CIFS_DEBUG2 */
  87 }
  88
  89 void cifs_dump_mids(struct TCP_Server_Info *server)
  90 {
  91 #ifdef CONFIG_CIFS_DEBUG2
  92         struct list_head *tmp;
  93         struct mid_q_entry *mid_entry;
  94
  95         if (server == NULL)
  96                 return;
  97
  98         cifs_dbg(VFS, "Dump pending requests:\n");
  99         spin_lock(&GlobalMid_Lock);
 100         list_for_each(tmp, &server->pending_mid_q) {
 101                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 102                 cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
 103                          mid_entry->mid_state,
 104                          le16_to_cpu(mid_entry->command),
 105                          mid_entry->pid,
 106                          mid_entry->callback_data,
 107                          mid_entry->mid);
 108 #ifdef CONFIG_CIFS_STATS2
 109                 cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
 110                          mid_entry->large_buf,
 111                          mid_entry->resp_buf,
 112                          mid_entry->when_received,
 113                          jiffies);
 114 #endif /* STATS2 */
 115                 cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
 116                          mid_entry->multiRsp, mid_entry->multiEnd);
 117                 if (mid_entry->resp_buf) {
 118                         cifs_dump_detail(mid_entry->resp_buf);
 119                         cifs_dump_mem("existing buf: ",
 120                                 mid_entry->resp_buf, 62);
 121                 }
 122         }
 123         spin_unlock(&GlobalMid_Lock);
 124 #endif /* CONFIG_CIFS_DEBUG2 */
 125 }
 126
 127 #ifdef CONFIG_PROC_FS
 128 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 129 {
 130         struct list_head *tmp1, *tmp2, *tmp3;
 131         struct mid_q_entry *mid_entry;
 132         struct TCP_Server_Info *server;
 133         struct cifs_ses *ses;
 134         struct cifs_tcon *tcon;
 135         int i, j;
 136         __u32 dev_type;
 137
 138         seq_puts(m,
 139                     "Display Internal CIFS Data Structures for Debugging\n"
 140                     "---------------------------------------------------\n");
 141         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 142         seq_printf(m, "Features:");
 143 #ifdef CONFIG_CIFS_DFS_UPCALL
 144         seq_printf(m, " dfs");
 145 #endif
 146 #ifdef CONFIG_CIFS_FSCACHE
 147         seq_printf(m, " fscache");
 148 #endif
 149 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 150         seq_printf(m, " lanman");
 151 #endif
 152 #ifdef CONFIG_CIFS_POSIX
 153         seq_printf(m, " posix");
 154 #endif
 155 #ifdef CONFIG_CIFS_UPCALL
 156         seq_printf(m, " spnego");
 157 #endif
 158 #ifdef CONFIG_CIFS_XATTR
 159         seq_printf(m, " xattr");
 160 #endif
 161 #ifdef CONFIG_CIFS_ACL
 162         seq_printf(m, " acl");
 163 #endif
 164         seq_putc(m, '\n');
 165         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 166         seq_printf(m, "Servers:");
 167
 168         i = 0;
 169         spin_lock(&cifs_tcp_ses_lock);
 170         list_for_each(tmp1, &cifs_tcp_ses_list) {
 171                 server = list_entry(tmp1, struct TCP_Server_Info,
 172                                     tcp_ses_list);
 173                 i++;
 174                 list_for_each(tmp2, &server->smb_ses_list) {
 175                         ses = list_entry(tmp2, struct cifs_ses,
 176                                          smb_ses_list);
 177                         if ((ses->serverDomain == NULL) ||
 178                                 (ses->serverOS == NULL) ||
 179                                 (ses->serverNOS == NULL)) {
 180                                 seq_printf(m, "\n%d) entry for %s not fully "
 181                                            "displayed\n\t", i, ses->serverName);
 182                         } else {
 183                                 seq_printf(m,
 184                                     "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 185                                     " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 186                                     " session status: %d\t",
 187                                 i, ses->serverName, ses->serverDomain,
 188                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 189                                 ses->capabilities, ses->status);
 190                         }
 191                         seq_printf(m, "TCP status: %d\n\tLocal Users To "
 192                                    "Server: %d SecMode: 0x%x Req On Wire: %d",
 193                                    server->tcpStatus, server->srv_count,
 194                                    server->sec_mode, in_flight(server));
 195
 196 #ifdef CONFIG_CIFS_STATS2
 197                         seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 198                                 atomic_read(&server->in_send),
 199                                 atomic_read(&server->num_waiters));
 200 #endif
 201
 202                         seq_puts(m, "\n\tShares:");
 203                         j = 0;
 204                         list_for_each(tmp3, &ses->tcon_list) {
 205                                 tcon = list_entry(tmp3, struct cifs_tcon,
 206                                                   tcon_list);
 207                                 ++j;
 208                                 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 209                                 seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
 210                                            tcon->treeName, tcon->tc_count);
 211                                 if (tcon->nativeFileSystem) {
 212                                         seq_printf(m, "Type: %s ",
 213                                                    tcon->nativeFileSystem);
 214                                 }
 215                                 seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
 216                                         "\nPathComponentMax: %d Status: 0x%d",
 217                                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 218                                         le32_to_cpu(tcon->fsAttrInfo.Attributes),
 219                                         le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 220                                         tcon->tidStatus);
 221                                 if (dev_type == FILE_DEVICE_DISK)
 222                                         seq_puts(m, " type: DISK ");
 223                                 else if (dev_type == FILE_DEVICE_CD_ROM)
 224                                         seq_puts(m, " type: CDROM ");
 225                                 else
 226                                         seq_printf(m, " type: %d ", dev_type);
 227
 228                                 if (tcon->need_reconnect)
 229                                         seq_puts(m, "\tDISCONNECTED ");
 230                                 seq_putc(m, '\n');
 231                         }
 232
 233                         seq_puts(m, "\n\tMIDs:\n");
 234
 235                         spin_lock(&GlobalMid_Lock);
 236                         list_for_each(tmp3, &server->pending_mid_q) {
 237                                 mid_entry = list_entry(tmp3, struct mid_q_entry,
 238                                         qhead);
 239                                 seq_printf(m, "\tState: %d com: %d pid:"
 240                                               " %d cbdata: %p mid %llu\n",
 241                                               mid_entry->mid_state,
 242                                               le16_to_cpu(mid_entry->command),
 243                                               mid_entry->pid,
 244                                               mid_entry->callback_data,
 245                                               mid_entry->mid);
 246                         }
 247                         spin_unlock(&GlobalMid_Lock);
 248                 }
 249         }
 250         spin_unlock(&cifs_tcp_ses_lock);
 251         seq_putc(m, '\n');
 252
 253         /* BB add code to dump additional info such as TCP session info now */
 254         return 0;
 255 }
 256
 257 static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 258 {
 259         return single_open(file, cifs_debug_data_proc_show, NULL);
 260 }
 261
 262 static const struct file_operations cifs_debug_data_proc_fops = {
 263         .owner          = THIS_MODULE,
 264         .open           = cifs_debug_data_proc_open,
 265         .read           = seq_read,
 266         .llseek         = seq_lseek,
 267         .release        = single_release,
 268 };
 269
 270 #ifdef CONFIG_CIFS_STATS
 271 static ssize_t cifs_stats_proc_write(struct file *file,
 272                 const char __user *buffer, size_t count, loff_t *ppos)
 273 {
 274         char c;
 275         int rc;
 276         struct list_head *tmp1, *tmp2, *tmp3;
 277         struct TCP_Server_Info *server;
 278         struct cifs_ses *ses;
 279         struct cifs_tcon *tcon;
 280
 281         rc = get_user(c, buffer);
 282         if (rc)
 283                 return rc;
 284
 285         if (c == '1' || c == 'y' || c == 'Y' || c == '0') {
 286 #ifdef CONFIG_CIFS_STATS2
 287                 atomic_set(&totBufAllocCount, 0);
 288                 atomic_set(&totSmBufAllocCount, 0);
 289 #endif /* CONFIG_CIFS_STATS2 */
 290                 spin_lock(&cifs_tcp_ses_lock);
 291                 list_for_each(tmp1, &cifs_tcp_ses_list) {
 292                         server = list_entry(tmp1, struct TCP_Server_Info,
 293                                             tcp_ses_list);
 294                         list_for_each(tmp2, &server->smb_ses_list) {
 295                                 ses = list_entry(tmp2, struct cifs_ses,
 296                                                  smb_ses_list);
 297                                 list_for_each(tmp3, &ses->tcon_list) {
 298                                         tcon = list_entry(tmp3,
 299                                                           struct cifs_tcon,
 300                                                           tcon_list);
 301                                         atomic_set(&tcon->num_smbs_sent, 0);
 302                                         if (server->ops->clear_stats)
 303                                                 server->ops->clear_stats(tcon);
 304                                 }
 305                         }
 306                 }
 307                 spin_unlock(&cifs_tcp_ses_lock);
 308         }
 309
 310         return count;
 311 }
 312
 313 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 314 {
 315         int i;
 316         struct list_head *tmp1, *tmp2, *tmp3;
 317         struct TCP_Server_Info *server;
 318         struct cifs_ses *ses;
 319         struct cifs_tcon *tcon;
 320
 321         seq_printf(m,
 322                         "Resources in use\nCIFS Session: %d\n",
 323                         sesInfoAllocCount.counter);
 324         seq_printf(m, "Share (unique mount targets): %d\n",
 325                         tconInfoAllocCount.counter);
 326         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 327                         bufAllocCount.counter,
 328                         cifs_min_rcv + tcpSesAllocCount.counter);
 329         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 330                         smBufAllocCount.counter, cifs_min_small);
 331 #ifdef CONFIG_CIFS_STATS2
 332         seq_printf(m, "Total Large %d Small %d Allocations\n",
 333                                 atomic_read(&totBufAllocCount),
 334                                 atomic_read(&totSmBufAllocCount));
 335 #endif /* CONFIG_CIFS_STATS2 */
 336
 337         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 338         seq_printf(m,
 339                 "\n%d session %d share reconnects\n",
 340                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 341
 342         seq_printf(m,
 343                 "Total vfs operations: %d maximum at one time: %d\n",
 344                 GlobalCurrentXid, GlobalMaxActiveXid);
 345
 346         i = 0;
 347         spin_lock(&cifs_tcp_ses_lock);
 348         list_for_each(tmp1, &cifs_tcp_ses_list) {
 349                 server = list_entry(tmp1, struct TCP_Server_Info,
 350                                     tcp_ses_list);
 351                 list_for_each(tmp2, &server->smb_ses_list) {
 352                         ses = list_entry(tmp2, struct cifs_ses,
 353                                          smb_ses_list);
 354                         list_for_each(tmp3, &ses->tcon_list) {
 355                                 tcon = list_entry(tmp3,
 356                                                   struct cifs_tcon,
 357                                                   tcon_list);
 358                                 i++;
 359                                 seq_printf(m, "\n%d) %s", i, tcon->treeName);
 360                                 if (tcon->need_reconnect)
 361                                         seq_puts(m, "\tDISCONNECTED ");
 362                                 seq_printf(m, "\nSMBs: %d",
 363                                            atomic_read(&tcon->num_smbs_sent));
 364                                 if (server->ops->print_stats)
 365                                         server->ops->print_stats(m, tcon);
 366                         }
 367                 }
 368         }
 369         spin_unlock(&cifs_tcp_ses_lock);
 370
 371         seq_putc(m, '\n');
 372         return 0;
 373 }
 374
 375 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 376 {
 377         return single_open(file, cifs_stats_proc_show, NULL);
 378 }
 379
 380 static const struct file_operations cifs_stats_proc_fops = {
 381         .owner          = THIS_MODULE,
 382         .open           = cifs_stats_proc_open,
 383         .read           = seq_read,
 384         .llseek         = seq_lseek,
 385         .release        = single_release,
 386         .write          = cifs_stats_proc_write,
 387 };
 388 #endif /* STATS */
 389
 390 static struct proc_dir_entry *proc_fs_cifs;
 391 static const struct file_operations cifsFYI_proc_fops;
 392 static const struct file_operations cifs_lookup_cache_proc_fops;
 393 static const struct file_operations traceSMB_proc_fops;
 394 static const struct file_operations cifs_security_flags_proc_fops;
 395 static const struct file_operations cifs_linux_ext_proc_fops;
 396
 397 void
 398 cifs_proc_init(void)
 399 {
 400         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 401         if (proc_fs_cifs == NULL)
 402                 return;
 403
 404         proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 405
 406 #ifdef CONFIG_CIFS_STATS
 407         proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 408 #endif /* STATS */
 409         proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 410         proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 411         proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 412                     &cifs_linux_ext_proc_fops);
 413         proc_create("SecurityFlags", 0, proc_fs_cifs,
 414                     &cifs_security_flags_proc_fops);
 415         proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 416                     &cifs_lookup_cache_proc_fops);
 417 }
 418
 419 void
 420 cifs_proc_clean(void)
 421 {
 422         if (proc_fs_cifs == NULL)
 423                 return;
 424
 425         remove_proc_entry("DebugData", proc_fs_cifs);
 426         remove_proc_entry("cifsFYI", proc_fs_cifs);
 427         remove_proc_entry("traceSMB", proc_fs_cifs);
 428 #ifdef CONFIG_CIFS_STATS
 429         remove_proc_entry("Stats", proc_fs_cifs);
 430 #endif
 431         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 432         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 433         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 434         remove_proc_entry("fs/cifs", NULL);
 435 }
 436
 437 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 438 {
 439         seq_printf(m, "%d\n", cifsFYI);
 440         return 0;
 441 }
 442
 443 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 444 {
 445         return single_open(file, cifsFYI_proc_show, NULL);
 446 }
 447
 448 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 449                 size_t count, loff_t *ppos)
 450 {
 451         char c;
 452         int rc;
 453
 454         rc = get_user(c, buffer);
 455         if (rc)
 456                 return rc;
 457         if (c == '0' || c == 'n' || c == 'N')
 458                 cifsFYI = 0;
 459         else if (c == '1' || c == 'y' || c == 'Y')
 460                 cifsFYI = 1;
 461         else if ((c > '1') && (c <= '9'))
 462                 cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
 463
 464         return count;
 465 }
 466
 467 static const struct file_operations cifsFYI_proc_fops = {
 468         .owner          = THIS_MODULE,
 469         .open           = cifsFYI_proc_open,
 470         .read           = seq_read,
 471         .llseek         = seq_lseek,
 472         .release        = single_release,
 473         .write          = cifsFYI_proc_write,
 474 };
 475
 476 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 477 {
 478         seq_printf(m, "%d\n", linuxExtEnabled);
 479         return 0;
 480 }
 481
 482 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 483 {
 484         return single_open(file, cifs_linux_ext_proc_show, NULL);
 485 }
 486
 487 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 488                 const char __user *buffer, size_t count, loff_t *ppos)
 489 {
 490         char c;
 491         int rc;
 492
 493         rc = get_user(c, buffer);
 494         if (rc)
 495                 return rc;
 496         if (c == '0' || c == 'n' || c == 'N')
 497                 linuxExtEnabled = 0;
 498         else if (c == '1' || c == 'y' || c == 'Y')
 499                 linuxExtEnabled = 1;
 500
 501         return count;
 502 }
 503
 504 static const struct file_operations cifs_linux_ext_proc_fops = {
 505         .owner          = THIS_MODULE,
 506         .open           = cifs_linux_ext_proc_open,
 507         .read           = seq_read,
 508         .llseek         = seq_lseek,
 509         .release        = single_release,
 510         .write          = cifs_linux_ext_proc_write,
 511 };
 512
 513 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 514 {
 515         seq_printf(m, "%d\n", lookupCacheEnabled);
 516         return 0;
 517 }
 518
 519 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 520 {
 521         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 522 }
 523
 524 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 525                 const char __user *buffer, size_t count, loff_t *ppos)
 526 {
 527         char c;
 528         int rc;
 529
 530         rc = get_user(c, buffer);
 531         if (rc)
 532                 return rc;
 533         if (c == '0' || c == 'n' || c == 'N')
 534                 lookupCacheEnabled = 0;
 535         else if (c == '1' || c == 'y' || c == 'Y')
 536                 lookupCacheEnabled = 1;
 537
 538         return count;
 539 }
 540
 541 static const struct file_operations cifs_lookup_cache_proc_fops = {
 542         .owner          = THIS_MODULE,
 543         .open           = cifs_lookup_cache_proc_open,
 544         .read           = seq_read,
 545         .llseek         = seq_lseek,
 546         .release        = single_release,
 547         .write          = cifs_lookup_cache_proc_write,
 548 };
 549
 550 static int traceSMB_proc_show(struct seq_file *m, void *v)
 551 {
 552         seq_printf(m, "%d\n", traceSMB);
 553         return 0;
 554 }
 555
 556 static int traceSMB_proc_open(struct inode *inode, struct file *file)
 557 {
 558         return single_open(file, traceSMB_proc_show, NULL);
 559 }
 560
 561 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 562                 size_t count, loff_t *ppos)
 563 {
 564         char c;
 565         int rc;
 566
 567         rc = get_user(c, buffer);
 568         if (rc)
 569                 return rc;
 570         if (c == '0' || c == 'n' || c == 'N')
 571                 traceSMB = 0;
 572         else if (c == '1' || c == 'y' || c == 'Y')
 573                 traceSMB = 1;
 574
 575         return count;
 576 }
 577
 578 static const struct file_operations traceSMB_proc_fops = {
 579         .owner          = THIS_MODULE,
 580         .open           = traceSMB_proc_open,
 581         .read           = seq_read,
 582         .llseek         = seq_lseek,
 583         .release        = single_release,
 584         .write          = traceSMB_proc_write,
 585 };
 586
 587 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 588 {
 589         seq_printf(m, "0x%x\n", global_secflags);
 590         return 0;
 591 }
 592
 593 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 594 {
 595         return single_open(file, cifs_security_flags_proc_show, NULL);
 596 }
 597
 598 static ssize_t cifs_security_flags_proc_write(struct file *file,
 599                 const char __user *buffer, size_t count, loff_t *ppos)
 600 {
 601         unsigned int flags;
 602         char flags_string[12];
 603         char c;
 604
 605         if ((count < 1) || (count > 11))
 606                 return -EINVAL;
 607
 608         memset(flags_string, 0, 12);
 609
 610         if (copy_from_user(flags_string, buffer, count))
 611                 return -EFAULT;
 612
 613         if (count < 3) {
 614                 /* single char or single char followed by null */
 615                 c = flags_string[0];
 616                 if (c == '0' || c == 'n' || c == 'N') {
 617                         global_secflags = CIFSSEC_DEF; /* default */
 618                         return count;
 619                 } else if (c == '1' || c == 'y' || c == 'Y') {
 620                         global_secflags = CIFSSEC_MAX;
 621                         return count;
 622                 } else if (!isdigit(c)) {
 623                         cifs_dbg(VFS, "invalid flag %c\n", c);
 624                         return -EINVAL;
 625                 }
 626         }
 627         /* else we have a number */
 628
 629         flags = simple_strtoul(flags_string, NULL, 0);
 630
 631         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
 632
 633         if (flags <= 0)  {
 634                 cifs_dbg(VFS, "invalid security flags %s\n", flags_string);
 635                 return -EINVAL;
 636         }
 637
 638         if (flags & ~CIFSSEC_MASK) {
 639                 cifs_dbg(VFS, "attempt to set unsupported security flags 0x%x\n",
 640                          flags & ~CIFSSEC_MASK);
 641                 return -EINVAL;
 642         }
 643         /* flags look ok - update the global security flags for cifs module */
 644         global_secflags = flags;
 645         if (global_secflags & CIFSSEC_MUST_SIGN) {
 646                 /* requiring signing implies signing is allowed */
 647                 global_secflags |= CIFSSEC_MAY_SIGN;
 648                 cifs_dbg(FYI, "packet signing now required\n");
 649         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 650                 cifs_dbg(FYI, "packet signing disabled\n");
 651         }
 652         /* BB should we turn on MAY flags for other MUST options? */
 653         return count;
 654 }
 655
 656 static const struct file_operations cifs_security_flags_proc_fops = {
 657         .owner          = THIS_MODULE,
 658         .open           = cifs_security_flags_proc_open,
 659         .read           = seq_read,
 660         .llseek         = seq_lseek,
 661         .release        = single_release,
 662         .write          = cifs_security_flags_proc_write,
 663 };
 664 #else
 665 inline void cifs_proc_init(void)
 666 {
 667 }
 668
 669 inline void cifs_proc_clean(void)
 670 {
 671 }
 672 #endif /* PROC_FS */