1 =====
2 Usage
3 =====
4
5 This module supports the SMB3 family of advanc
6 as older dialects, originally called "CIFS" or
7
8 The CIFS VFS module for Linux supports many ad
9 features such as hierarchical DFS like namespa
10 It was designed to comply with the SNIA CIFS T
11 supersedes the 1992 X/Open SMB Standard) as we
12 practical interoperability with Windows 2000,
13 servers. This code was developed in participa
14 Information Foundation. CIFS and now SMB3 has
15 standard for interoperating between Macs and W
16
17 Please see
18 MS-SMB2 (for detailed SMB2/SMB3/SMB3.1.1 proto
19 or https://samba.org/samba/PFIF/
20 for more details.
21
22
23 For questions or bug reports please contact:
24
25 smfrench@gmail.com
26
27 See the project page at: https://wiki.samba.or
28
29 Build instructions
30 ==================
31
32 For Linux:
33
34 1) Download the kernel (e.g. from https://www.
35 and change directory into the top of the ke
36 (e.g. /usr/src/linux-2.5.73)
37 2) make menuconfig (or make xconfig)
38 3) select cifs from within the network filesys
39 4) save and exit
40 5) make
41
42
43 Installation instructions
44 =========================
45
46 If you have built the CIFS vfs as module (succ
47 type ``make modules_install`` (or if you prefe
48 the modules directory e.g. /lib/modules/6.3.0-
49
50 If you have built the CIFS vfs into the kernel
51 for your distribution on how to install a new
52 would simply type ``make install``).
53
54 If you do not have the utility mount.cifs (in
55 the CIFS VFS web site) copy it to the same dir
56 reside (usually /sbin). Although the helper s
57 required, mount.cifs is recommended. Most dis
58 package that includes this utility so it is re
59
60 Note that running the Winbind pam/nss module (
61 Linux clients is useful in mapping Uids and Gi
62 domain to the proper network user. The mount.
63 found at cifs-utils.git on git.samba.org
64
65 If cifs is built as a module, then the size an
66 and maximum number of simultaneous requests to
67 Changing these from their defaults is not reco
68
69 modinfo <path to cifs.ko>
70
71 on kernel/fs/smb/client/cifs.ko the list of co
72 at module initialization time (by running insm
73
74 Recommendations
75 ===============
76
77 To improve security the SMB2.1 dialect or late
78 the new default. To use old dialects (e.g. to
79 on mount (or vers=2.0 for Windows Vista). Not
80 much older and less secure than the default di
81 many advanced security features such as downgr
82 and encrypted shares and stronger signing and
83 There are additional mount options that may be
84 improved POSIX behavior (NB: can use vers=3 to
85
86 ``mfsymlinks`` and either ``cifsacl`` or ``
87
88 Allowing User Mounts
89 ====================
90
91 To permit users to mount and unmount over dire
92 with the cifs vfs. A way to enable such mount
93 utility as suid (e.g. ``chmod +s /sbin/mount.c
94 umount shares they mount requires
95
96 1) mount.cifs version 1.4 or later
97 2) an entry for the share in /etc/fstab indica
98 unmount it e.g.::
99
100 //server/usersharename /mnt/username cif
101
102 Note that when the mount.cifs utility is run s
103 in order to reduce risks, the ``nosuid`` mount
104 disallow execution of an suid program mounted
105 When mount is executed as root, nosuid is not
106 and execution of suid programs on the remote t
107 by default. This can be changed, as with nfs a
108 by simply specifying ``nosuid`` among the moun
109 though to be able to pass the suid flag to mou
110 mount.cifs with the following flag: CIFS_ALLOW
111
112 There is a corresponding manual page for cifs
113 later source tree in docs/manpages/mount.cifs.
114
115 Allowing User Unmounts
116 ======================
117
118 To permit users to unmount directories that th
119 the utility umount.cifs may be used. It may b
120 umount.cifs is placed in /sbin, umount can inv
121 (at least for most versions of the umount util
122 mounts, unless umount is invoked with -i (whic
123 helper). As with mount.cifs, to enable user un
124 as suid (e.g. ``chmod +s /sbin/umount.cifs``)
125 allow adding entries to a file to the /etc/per
126 equivalent suid effect). For this utility to
127 must be a cifs mount, and the uid of the curre
128 of the user who mounted the resource.
129
130 Also note that the customary way of allowing u
131 (instead of using mount.cifs and unmount.cifs
132 to the file /etc/fstab for each //server/share
133 this can become unwieldy when potential mount
134 or unpredictable UNC names.
135
136 Samba Considerations
137 ====================
138
139 Most current servers support SMB2.1 and SMB3 w
140 but there are useful protocol extensions for t
141 dialect, so to get the maximum benefit if moun
142 (CIFS/SMB1), we recommend using a server that
143 Unix Extensions standard (e.g. almost any ver
144 2.2.5 or later) but the CIFS vfs works fine wi
145 Note that uid, gid and file permissions will d
146 not have a server that supports the Unix exten
147 2.2.5 or later). To enable the Unix CIFS Exte
148 the line::
149
150 unix extensions = yes
151
152 to your smb.conf file on the server. Note tha
153 are also useful (on the Samba server) when the
154 Linux::
155
156 case sensitive = yes
157 delete readonly = yes
158 ea support = yes
159
160 Note that server ea support is required for su
161 cifs client, and that EA support is present in
162 3.0.6 and later (also EA support works in all
163 shares on NTFS filesystems). Extended Attribu
164 feature of most Linux filesystems which may re
165 make menuconfig. Client support for extended a
166 disabled on a per-mount basis by specifying ``
167
168 The CIFS client can get and set POSIX ACLs (ge
169 version 3.10 and later. Setting POSIX ACLs re
170 then POSIX support in the CIFS configuration o
171 module. POSIX ACL support can be disabled on
172 ``noacl`` on mount.
173
174 Some administrators may want to change Samba's
175 ``create mask`` parameters from the default.
176 newly created files can end up with an unneces
177 which may not be what you want, although if th
178 enabled on the server and client, subsequent s
179 fix the mode. Note that creating special devi
180 may require specifying a mkdev function to Sam
181 Samba 3.0.6 or later. For more information on
182 (``man smb.conf``) on the Samba server system.
183 unlike the smbfs vfs, does not read the smb.co
184 (the few optional settings are passed in on mo
185 Note that Samba 2.2.7 or later includes a fix
186 open files (required for strict POSIX complian
187 supported this feature. Samba server does not
188 outside of the share, so in Samba versions pri
189 files with absolute paths (ie beginning with s
190
191 ln -s /mnt/foo bar
192
193 would be forbidden. Samba 3.0.6 server or late
194 such symlinks safely by converting unsafe syml
195 files that are outside of the share) to a samb
196 that is ignored by local server applications a
197 not be traversed by the Samba server). This i
198 application using the cifs vfs. Absolute symli
199 later, but only for remote clients using the C
200 be invisible to Windows clients and typically
201 applications running on the same server as Sam
202
203 Use instructions
204 ================
205
206 Once the CIFS VFS support is built into the ke
207 (cifs.ko), you can use mount syntax like the f
208 Mac or Windows servers::
209
210 mount -t cifs //9.53.216.11/e$ /mnt -o usern
211
212 Before -o the option -v may be specified to ma
213 mount helper display the mount steps more verb
214 After -o the following commonly used cifs vfs
215 are supported::
216
217 username=<username>
218 password=<password>
219 domain=<domain name>
220
221 Other cifs mount options are described below.
222 ip addresses) is available if the mount helper
223 you do not trust the server to which are mount
224 cifs signing enabled (and the physical network
225 of the standard mount options ``noexec`` and `
226 running an altered binary on your local system
227 or altered by a hostile router).
228
229 Although mounting using format corresponding t
230 not possible in mount.cifs yet, it is possible
231 for the server and sharename (which is somewha
232 syntax) instead of the more widely used UNC fo
233
234 mount -t cifs tcp_name_of_server:share_name
235
236 When using the mount helper mount.cifs, passwo
237 mechanisms, instead of specifying it after -o
238 on the command line:
239 1) By including it in a credential file. Speci
240 of the mount options. Credential files contain
241
242 username=someuser
243 password=your_password
244
245 2) By specifying the password in the PASSWD en
246 the user name can be taken from the USER en
247 3) By specifying the password in a file by nam
248 4) By specifying the password in a file by fil
249
250 If no password is provided, mount.cifs will pr
251
252 Restrictions
253 ============
254
255 Servers must support either "pure-TCP" (port 4
256 1001/1002 support for "Netbios-Over-TCP/IP." T
257 problem as most servers support this.
258
259 Valid filenames differ between Windows and Lin
260 filenames which contain certain reserved chara
261 which is used to delimit the beginning of a st
262 Linux allows a slightly wider set of valid cha
263 servers can remap such characters when an expl
264 the Server's registry. Samba starting with ve
265 filenames (ie those which contain valid Linux
266 would be forbidden for Windows/CIFS semantics)
267 configured for Unix Extensions (and the client
268 /proc/fs/cifs/LinuxExtensionsEnabled). In addi
269 ``mapposix`` can be used on CIFS (vers=1.0) to
270 illegal Windows/NTFS/SMB characters to a remap
271 is the default for SMB3). This remap (``mappos
272 compatible with Mac (and "Services for Mac" on
273
274 CIFS VFS Mount Options
275 ======================
276 A partial list of the supported mount options
277
278 username
279 The user name to use when tryi
280 the CIFS session.
281 password
282 The user password. If the mou
283 installed, the user will be pr
284 if not supplied.
285 ip
286 The ip address of the target s
287 unc
288 The target server Universal Ne
289 mount.
290 domain
291 Set the SMB/CIFS workgroup nam
292 username during CIFS session e
293 forceuid
294 Set the default uid for inodes
295 passed in on mount. For mounts
296 which do support the CIFS Unix
297 properly configured Samba serv
298 the uid, gid and mode so this
299 specified unless the server an
300 numbering differ. If the serv
301 same domain (e.g. running winb
302 the server supports the Unix E
303 and gid can be retrieved from
304 and gid would not have to be s
305 For servers which do not suppo
306 extensions, the default uid (a
307 of existing files will be the
308 who executed the mount (root,
309 is configured setuid for user
310 (gid) mount option is specifie
311 checks (authorization checks)
312 at the server, but there are c
313 may want to restrict at the cl
314 servers which do not report a
315 (such as Windows), permissions
316 client, and a crude form of cl
317 can be enabled by specifying f
318 the client. (default)
319 forcegid
320 (similar to above but for the
321 noforceuid
322 Fill in file owner information
323 the server if possible. With t
324 the uid= option (on mount) wil
325 can not support returning uids
326 noforcegid
327 (similar to above but for the
328 uid
329 Set the default uid for inodes
330 cifs kernel driver which local
331 supports the unix extensions t
332 not used to fill in the owner
333 unless the ``forceuid`` parame
334 gid
335 Set the default gid for inodes
336 file_mode
337 If CIFS Unix extensions are no
338 this overrides the default mod
339 fsc
340 Enable local disk caching usin
341 option could be useful to impr
342 heavily loaded server and/or n
343 disk is faster than reading fr
344 This could also impact scalabi
345 number of calls to the server
346 caching is not suitable for al
347 type workloads. So, you need t
348 workload/scenario before using
349 disk caching is functional for
350 dir_mode
351 If CIFS Unix extensions are no
352 this overrides the default mod
353 port
354 attempt to contact the server
355 trying the usual ports (port 4
356 iocharset
357 Codepage used to convert local
358 Unicode. Unicode is used by de
359 names if the server supports i
360 not specified then the nls_def
361 during the local client kernel
362 If server does not support Uni
363 unused.
364 rsize
365 default read size (usually 16K
366 can not use rsize larger than
367 defaults to 16K and may be cha
368 kmalloc size allowed by your k
369 for cifs.ko. Setting CIFSMaxBu
370 will cause cifs to use more me
371 in some cases. To use rsize g
372 cifs protocol maximum) also re
373 a new Unix Capability flag (fo
374 newer servers (e.g. Samba 3.0.
375 set from a minimum of 2048 to
376 CIFSMaxBufSize, whichever is s
377 wsize
378 default write size (default 57
379 maximum wsize currently allowe
380 4096 byte pages)
381 actimeo=n
382 attribute cache timeout in sec
383 After this timeout, the cifs c
384 information from the server. T
385 attribute cache timeout to sui
386 timeouts mean better the cache
387 of calls to the server. Longer
388 of calls to the server at the
389 coherency checks (i.e. incorre
390 period of time).
391 rw
392 mount the network share read-w
393 server may still consider the
394 ro
395 mount network share read-only
396 version
397 used to distinguish different
398 mount helper utility (not typi
399 sep
400 if first mount option (after t
401 the comma as the separator bet
402 parameters. e.g.::
403
404 -o user=myname,passwor
405
406 could be passed instead with p
407
408 -o sep=.user=myname.pa
409
410 this might be useful when comm
411 or password or domain. This op
412 when the cifs mount helper cif
413 is used.
414 nosuid
415 Do not allow remote executable
416 program to be executed. This
417 to servers such as Samba which
418 If you do not trust the server
419 targets) it is recommended tha
420 greater security.
421 exec
422 Permit execution of binaries o
423 noexec
424 Do not permit execution of bin
425 dev
426 Recognize block devices on the
427 nodev
428 Do not recognize devices on th
429 suid
430 Allow remote files on this mou
431 be executed (default for mount
432 nosuid is default for user mou
433 credentials
434 Although ignored by the cifs k
435 the mount helper, mount.cifs.
436 opens and reads the credential
437 to obtain the userid and passw
438 the cifs vfs.
439 guest
440 Although ignored by the kernel
441 mount helper will not prompt t
442 if guest is specified on the m
443 password is specified a null p
444 perm
445 Client does permission checks
446 and gid of the file against th
447 Note that this is in addition
448 target machine done by the ser
449 Client permission checking is
450 noperm
451 Client does not do permission
452 files on this mount to access
453 client system. It is typically
454 supports the CIFS Unix Extensi
455 client and server system do no
456 access by the user doing the m
457 non CIFS Unix Extension mounts
458 mode is specified on the mount
459 client (e.g. perhaps when Mult
460 Note that this does not affect
461 target machine done by the ser
462 ACL against the user name prov
463 serverino
464 Use server's inode numbers ins
465 incrementing inode numbers on
466 make it easier to spot hardlin
467 the same inode numbers) and in
468 note that the server does not
469 are unique if multiple server
470 single share (since inode numb
471 be unique if multiple filesyst
472 shared higher level directory)
473 (e.g. pre-Windows 2000) do not
474 or the CIFS Unix Extensions eq
475 this mount option will have no
476 under nfsd requires this mount
477 This is now the default if ser
478 required network operation.
479 noserverino
480 Client generates inode numbers
481 from the server). These inode
482 unmount or reboot which can co
483 but not all server filesystems
484 numbers.
485 setuids
486 If the CIFS Unix extensions ar
487 the client will attempt to set
488 the local process on newly cre
489 devices (create, mkdir, mknod)
490 are not negotiated, for newly
491 instead of using the default u
492 the mount, cache the new file'
493 that the uid for the file can
494 reloaded (or the user remounts
495 nosetuids
496 The client will not attempt to
497 on newly created files, direct
498 mkdir, mknod) which will resul
499 uid and gid to the default (us
500 user who mounted the share).
501 the client) set the uid and gi
502 Unix Extensions are not negoti
503 new files will appear to be th
504 uid (gid) parameter specified
505 netbiosname
506 When mounting to servers via p
507 source name to use to represen
508 name when doing the RFC1001 ne
509 direct
510 Do not do inode data caching o
511 This precludes mmapping files
512 with fast networks and little
513 client (e.g. when the applicat
514 reads bigger than page size wi
515 this can provide better perfor
516 behavior which caches reads (r
517 (writebehind) through the loca
518 if oplock (caching token) is g
519 direct allows write operations
520 to be sent to the server.
521 strictcache
522 Use for switching on strict ca
523 client read from the cache all
524 otherwise - read from the serv
525 in the cache, but if the clien
526 it writes the data to the serv
527 rwpidforward
528 Forward pid of a process who o
529 operation on that file. This p
530 from failing on read and write
531 acl
532 Allow setfacl and getfacl to m
533 supports them. (default)
534 noacl
535 Do not allow setfacl and getfa
536 user_xattr
537 Allow getting and setting user
538 name begins with ``user.`` or
539 attributes) to the server. Th
540 setfattr and getfattr utilitie
541 nouser_xattr
542 Do not allow getfattr/setfattr
543 mapchars
544 Translate six of the seven res
545
546 *?<>|:
547
548 to the remap range (above 0xF0
549 allows the CIFS client to reco
550 such characters by Windows's P
551 also be useful when mounting t
552 (which also forbids creating a
553 whose names contain any of the
554 This has no effect if the serv
555 Unicode on the wire.
556 nomapchars
557 Do not translate any of these
558 nocase
559 Request case insensitive path
560 sensitive is the default if th
561 (mount option ``ignorecase`` i
562 posixpaths
563 If CIFS Unix extensions are su
564 negotiate posix path name supp
565 characters forbidden in typica
566 requiring remapping. (default)
567 noposixpaths
568 If CIFS Unix extensions are su
569 posix path name support (this
570 reject creatingfile with certa
571 nounix
572 Disable the CIFS Unix Extensio
573 connection). This is rarely ne
574 in order to turn off multiple
575 posix acls, posix locks, posix
576 and retrieving uids/gids/mode
577 work around a bug in server wh
578 Extensions.
579 nobrl
580 Do not send byte range lock re
581 This is necessary for certain
582 with cifs style mandatory byte
583 cifs servers do not yet suppor
584 byte range locks).
585 forcemandatorylock
586 Even if the server supports po
587 locking, send only mandatory l
588 (presumably rare) applications
589 DOS/Windows, which require Win
590 locking, they may be able to t
591 forcing the cifs client to onl
592 even if the cifs server would
593 ``forcemand`` is accepted as a
594 option.
595 nostrictsync
596 If this mount option is set, w
597 fsync call then the cifs clien
598 to the server (to force the se
599 for this file immediately to d
600 all dirty (cached) file data t
601 server to respond to the write
602 very slow, and some servers ma
603 delaying slightly flushing the
604 turning on this option may be
605 applications that fsync too mu
606 crash. If this mount option i
607 send an SMB flush request (and
608 fsync call.
609 nodfs
610 Disable DFS (global name space
611 server claims to support it.
612 a problem with parsing of DFS
613 versions 3.0.24 and 3.0.25.
614 remount
615 remount the share (often used
616 or vice versa)
617 cifsacl
618 Report mode bits (e.g. on stat
619 the file. (EXPERIMENTAL)
620 servern
621 Specify the server 's netbios
622 when attempting to setup a ses
623 This is needed for mounting to
624 as OS/2 or Windows 98 and Wind
625 support a default server name.
626 to 15 characters long and is u
627 sfu
628 When the CIFS Unix Extensions
629 create device files and fifos
630 Services for Unix (SFU). In a
631 of the mode via the SETFILEBIT
632 SFU does). In the future the
633 mode also will be emulated usi
634 descriptor (ACL).
635 mfsymlinks
636 Enable support for Minshall+Fr
637 (see http://wiki.samba.org/ind
638 This option is ignored when sp
639 'sfu' option. Minshall+French
640 the server supports the CIFS U
641 sign
642 Must use packet signing (helps
643 by intermediate systems in the
644 does not work with lanman or p
645 seal
646 Must seal (encrypt) all data o
647 sending on the network. Requi
648 Note that this differs from th
649 causes encryption of data sent
650 shares mounted to the same ser
651 locallease
652 This option is rarely needed.
653 used by some applications such
654 check to see whether a file is
655 to explicitly request a lease,
656 is cacheable (oplocked). Unfo
657 is not oplocked, it could stil
658 could grant fcntl leases if no
659 the file) for cases for exampl
660 support oplocks and the user i
661 the file will be from this cli
662 will allow the cifs client to
663 for files which are not oplock
664 in that case. (EXPERIMENTAL)
665 sec
666 Security mode. Allowed values
667
668 none
669 attempt to con
670 krb5
671 Use Kerberos v
672 krb5i
673 Use Kerberos a
674 ntlm
675 Use NTLM passw
676 ntlmi
677 Use NTLM passw
678 /proc/fs/cifs/
679 server require
680 ntlmv2
681 Use NTLMv2 pas
682 ntlmv2i
683 Use NTLMv2 pas
684 lanman
685 (if configured
686 lanman hash
687 hard
688 Retry file operations if serve
689 soft
690 Limit retries to unresponsive
691 one retry) before returning an
692
693 The mount.cifs mount helper also accepts a few
694 including:
695
696 =============== ==============================
697 -S take password from stdin (equi
698 variable ``PASSWD_FD=0``
699 -V print mount.cifs version
700 -? display simple usage informati
701 =============== ==============================
702
703 With most 2.6 kernel versions of modutils, the
704 module can be displayed via modinfo.
705
706 Misc /proc/fs/cifs Flags and Debug Info
707 =======================================
708
709 Informational pseudo-files:
710
711 ======================= ======================
712 DebugData Displays information a
713 shares, features enabl
714 version.
715 Stats Lists summary resource
716 share statistics.
717 open_files List all the open file
718 mount_params List of all mount para
719 ======================= ======================
720
721 Configuration pseudo-files:
722
723 ======================= ======================
724 SecurityFlags Flags which control se
725 also packet signing. A
726 flags (e.g. for NTLMv2
727 the signing flags. Sp
728 hashing mechanisms (as
729 does not make much sen
730
731 0x00C5
732
733 (NTLMv2 and packet sig
734 may require enabling a
735
736 may use packet signi
737 must use packet sign
738 may use NTLMv2
739 must use NTLMv2
740 may use Kerberos sec
741 must use Kerberos
742 may use NTLMSSP
743 must use NTLMSSP
744 seal (packet encrypt
745 must seal
746
747 cifsFYI If set to non-zero val
748 will be logged to the
749 contains three flags c
750 debugging entries. Th
751 to is 7 which enables
752 Some debugging stateme
753 cifs kernel unless CON
754 kernel configuration.
755 more of the following
756
757 +-------------------
758 | log cifs informati
759 +-------------------
760 | log return codes f
761 +-------------------
762 | log slow responses
763 | (ie which take lon
764 |
765 | CONFIG_CIFS_STATS2
766 +-------------------
767
768 traceSMB If set to one, debug i
769 system error log with
770 and responses (default
771 LookupCacheEnable If set to one, inode i
772 for one second improvi
773 (default 1)
774 LinuxExtensionsEnabled If set to one then the
775 use the CIFS "UNIX" ex
776 protocol enhancements
777 to return accurate UID
778 as support symbolic li
779 such as Samba that sup
780 extensions but do not
781 support and want to ma
782 to values supplied at
783 actual values, then se
784 dfscache List the content of th
785 If set to 0, the clien
786 ======================= ======================
787
788 These experimental features and tracing can be
789 /proc/fs/cifs (after the cifs module has been
790 kernel, e.g. insmod cifs). To enable a featu
791 tracing to the kernel message log type::
792
793 echo 7 > /proc/fs/cifs/cifsFYI
794
795 cifsFYI functions as a bit mask. Setting it to
796 logging of various informational messages. 2
797 SMB return codes while 4 enables logging of re
798 than one second to complete (except for byte r
799 Setting it to 4 requires CONFIG_CIFS_STATS2 to
800 (.config). Setting it to seven enables all thr
801 the start of smb requests and responses can be
802
803 echo 1 > /proc/fs/cifs/traceSMB
804
805 Per share (per client mount) statistics are av
806 Additional information is available if CONFIG_
807 kernel configuration (.config). The statistic
808 represent the number of attempted and failed (
809 server) SMB3 (or cifs) requests grouped by req
810 Also recorded is the total bytes read and byte
811 that share. Note that due to client caching e
812 number of bytes read and written by the applic
813 Statistics can be reset to zero by ``echo 0 >
814 useful if comparing performance of two differe
815
816 Also note that ``cat /proc/fs/cifs/DebugData``
817 the active sessions and the shares that are mo
818
819 Enabling Kerberos (extended security) works bu
820 of the helper program cifs.upcall to be presen
821 /etc/request-key.conf file. The cifs.upcall h
822 project(https://www.samba.org). NTLM and NTLMv
823 require this helper. Note that NTLMv2 security
824 cifs.upcall helper program), instead of using
825 some use cases.
826
827 DFS support allows transparent redirection to
828 In addition, DFS support for target shares whi
829 names which begin with host names (rather than
830 a user space helper (such as cifs.upcall) to b
831 translate host names to ip address, and the us
832 be configured in the file /etc/request-key.con
833 many NAS appliances support DFS as a way of co
834 space to ease network configuration and improv
835
836 To use cifs Kerberos and DFS support, the Linu
837 installed and something like the following lin
838 /etc/request-key.conf file::
839
840 create cifs.spnego * * /usr/local/sbin/cifs.
841 create dns_resolver * * /usr/local/sbin/cifs
842
843 CIFS kernel module parameters
844 =============================
845 These module parameters can be specified or mo
846 module loading or during the runtime by using
847
848 /sys/module/cifs/parameters/<param>
849
850 i.e.::
851
852 echo "value" > /sys/module/cifs/parameters
853
854 More detailed descriptions of the available mo
855 can be seen by doing:
856
857 modinfo cifs (or modinfo smb3)
858
859 ================= ============================
860 1. enable_oplocks Enable or disable oplocks. O
861 [Y/y/1]. To disable use any
862 ================= ============================
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