Revert "ext4: use old interface for ext4_readdir()"
[linux-3.10.git] / 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 */