similarity index 60%
rename from Documentation/filesystems/cifs/AUTHORS
rename to Documentation/admin-guide/cifs/authors.rst
@@ -1,5 +1,10 @@
+=======
+Authors
+=======
+
Original Author
-===============
+---------------
+
Steve French (sfrench@samba.org)
The author wishes to express his appreciation and thanks to:
@@ -12,7 +17,7 @@ side of the original CIFS Unix extensions and reviewing and implementing
portions of the newer CIFS POSIX extensions into the Samba 3 file server. Thank
Dave Boutcher of IBM Rochester (author of the OS/400 smb/cifs filesystem client)
for proving years ago that very good smb/cifs clients could be done on Unix-like
-operating systems. Volker Lendecke, Andrew Tridgell, Urban Widmark, John
+operating systems. Volker Lendecke, Andrew Tridgell, Urban Widmark, John
Newbigin and others for their work on the Linux smbfs module. Thanks to
the other members of the Storage Network Industry Association CIFS Technical
Workgroup for their work specifying this highly complex protocol and finally
@@ -20,33 +25,34 @@ thanks to the Samba team for their technical advice and encouragement.
Patch Contributors
------------------
-Zwane Mwaikambo
-Andi Kleen
-Amrut Joshi
-Shobhit Dayal
-Sergey Vlasov
-Richard Hughes
-Yury Umanets
-Mark Hamzy (for some of the early cifs IPv6 work)
-Domen Puncer
-Jesper Juhl (in particular for lots of whitespace/formatting cleanup)
-Vince Negri and Dave Stahl (for finding an important caching bug)
-Adrian Bunk (kcalloc cleanups)
-Miklos Szeredi
-Kazeon team for various fixes especially for 2.4 version.
-Asser Ferno (Change Notify support)
-Shaggy (Dave Kleikamp) for innumerable small fs suggestions and some good cleanup
-Gunter Kukkukk (testing and suggestions for support of old servers)
-Igor Mammedov (DFS support)
-Jeff Layton (many, many fixes, as well as great work on the cifs Kerberos code)
-Scott Lovenberg
-Pavel Shilovsky (for great work adding SMB2 support, and various SMB3 features)
-Aurelien Aptel (for DFS SMB3 work and some key bug fixes)
-Ronnie Sahlberg (for SMB3 xattr work, bug fixes, and lots of great work on compounding)
-Shirish Pargaonkar (for many ACL patches over the years)
-Sachin Prabhu (many bug fixes, including for reconnect, copy offload and security)
-Paulo Alcantara
-Long Li (some great work on RDMA, SMB Direct)
+
+- Zwane Mwaikambo
+- Andi Kleen
+- Amrut Joshi
+- Shobhit Dayal
+- Sergey Vlasov
+- Richard Hughes
+- Yury Umanets
+- Mark Hamzy (for some of the early cifs IPv6 work)
+- Domen Puncer
+- Jesper Juhl (in particular for lots of whitespace/formatting cleanup)
+- Vince Negri and Dave Stahl (for finding an important caching bug)
+- Adrian Bunk (kcalloc cleanups)
+- Miklos Szeredi
+- Kazeon team for various fixes especially for 2.4 version.
+- Asser Ferno (Change Notify support)
+- Shaggy (Dave Kleikamp) for innumerable small fs suggestions and some good cleanup
+- Gunter Kukkukk (testing and suggestions for support of old servers)
+- Igor Mammedov (DFS support)
+- Jeff Layton (many, many fixes, as well as great work on the cifs Kerberos code)
+- Scott Lovenberg
+- Pavel Shilovsky (for great work adding SMB2 support, and various SMB3 features)
+- Aurelien Aptel (for DFS SMB3 work and some key bug fixes)
+- Ronnie Sahlberg (for SMB3 xattr work, bug fixes, and lots of great work on compounding)
+- Shirish Pargaonkar (for many ACL patches over the years)
+- Sachin Prabhu (many bug fixes, including for reconnect, copy offload and security)
+- Paulo Alcantara
+- Long Li (some great work on RDMA, SMB Direct)
Test case and Bug Report contributors
similarity index 91%
rename from Documentation/filesystems/cifs/CHANGES
rename to Documentation/admin-guide/cifs/changes.rst
@@ -1,3 +1,7 @@
+=======
+Changes
+=======
+
See https://wiki.samba.org/index.php/LinuxCIFSKernel for summary
information (that may be easier to read than parsing the output of
"git log fs/cifs") about fixes/improvements to CIFS/SMB2/SMB3 support (changes
new file mode 100644
@@ -0,0 +1,21 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+====
+CIFS
+====
+
+.. toctree::
+ :maxdepth: 2
+
+ introduction
+ usage
+ todo
+ changes
+ authors
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
similarity index 98%
rename from Documentation/filesystems/cifs/cifs.txt
rename to Documentation/admin-guide/cifs/introduction.rst
@@ -1,3 +1,7 @@
+============
+Introduction
+============
+
This is the client VFS module for the SMB3 NAS protocol as well
as for older dialects such as the Common Internet File System (CIFS)
protocol which was the successor to the Server Message Block
@@ -33,7 +37,9 @@
tools (including smbinfo and setcifsacl) that can be obtained from
https://git.samba.org/?p=cifs-utils.git
+
or
+
git://git.samba.org/cifs-utils.git
mount.cifs should be installed in the directory with the other mount helpers.
@@ -41,5 +47,7 @@
For more information on the module see the project wiki page at
https://wiki.samba.org/index.php/LinuxCIFS
+
and
+
https://wiki.samba.org/index.php/LinuxCIFS_utils
similarity index 58%
rename from Documentation/filesystems/cifs/TODO
rename to Documentation/admin-guide/cifs/todo.rst
@@ -1,3 +1,7 @@
+====
+TODO
+====
+
Version 2.14 December 21, 2018
A Partial List of Missing Features
@@ -8,6 +12,7 @@ for visible, important contributions to this module. Here
is a partial list of the known problems and missing features:
a) SMB3 (and SMB3.1.1) missing optional features:
+
- multichannel (started), integration with RDMA
- directory leases (improved metadata caching), started (root dir only)
- T10 copy offload ie "ODX" (copy chunk, and "Duplicate Extents" ioctl
@@ -16,45 +21,46 @@ a) SMB3 (and SMB3.1.1) missing optional features:
b) improved sparse file support
c) Directory entry caching relies on a 1 second timer, rather than
-using Directory Leases, currently only the root file handle is cached longer
+ using Directory Leases, currently only the root file handle is cached longer
d) quota support (needs minor kernel change since quota calls
-to make it to network filesystems or deviceless filesystems)
+ to make it to network filesystems or deviceless filesystems)
e) Additional use cases where we use "compoounding" (e.g. open/query/close
-and open/setinfo/close) to reduce the number of roundtrips, and also
-open to reduce redundant opens (using deferred close and reference counts more).
+ and open/setinfo/close) to reduce the number of roundtrips, and also
+ open to reduce redundant opens (using deferred close and reference counts
+ more).
f) Finish inotify support so kde and gnome file list windows
-will autorefresh (partially complete by Asser). Needs minor kernel
-vfs change to support removing D_NOTIFY on a file.
+ will autorefresh (partially complete by Asser). Needs minor kernel
+ vfs change to support removing D_NOTIFY on a file.
g) Add GUI tool to configure /proc/fs/cifs settings and for display of
-the CIFS statistics (started)
+ the CIFS statistics (started)
h) implement support for security and trusted categories of xattrs
-(requires minor protocol extension) to enable better support for SELINUX
+ (requires minor protocol extension) to enable better support for SELINUX
i) Add support for tree connect contexts (see MS-SMB2) a new SMB3.1.1 protocol
feature (may be especially useful for virtualization).
j) Create UID mapping facility so server UIDs can be mapped on a per
-mount or a per server basis to client UIDs or nobody if no mapping
-exists. Also better integration with winbind for resolving SID owners
+ mount or a per server basis to client UIDs or nobody if no mapping
+ exists. Also better integration with winbind for resolving SID owners
k) Add tools to take advantage of more smb3 specific ioctls and features
-(passthrough ioctl/fsctl for sending various SMB3 fsctls to the server
-is in progress, and a passthrough query_info call is already implemented
-in cifs.ko to allow smb3 info levels queries to be sent from userspace)
+ (passthrough ioctl/fsctl for sending various SMB3 fsctls to the server
+ is in progress, and a passthrough query_info call is already implemented
+ in cifs.ko to allow smb3 info levels queries to be sent from userspace)
l) encrypted file support
m) improved stats gathering tools (perhaps integration with nfsometer?)
-to extend and make easier to use what is currently in /proc/fs/cifs/Stats
+ to extend and make easier to use what is currently in /proc/fs/cifs/Stats
-n) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
-file attribute via chflags) and improve user space tools for managing and
-viewing them.
+n) allow setting more NTFS/SMB3 file attributes remotely (currently limited to
+ compressed file attribute via chflags) and improve user space tools for
+ managing and viewing them.
o) mount helper GUI (to simplify the various configuration options on mount)
@@ -65,55 +71,56 @@ p) Add support for witness protocol (perhaps ioctl to cifs.ko from user space
different servers, and the server we are connected to has gone down.
q) Allow mount.cifs to be more verbose in reporting errors with dialect
-or unsupported feature errors.
+ or unsupported feature errors.
r) updating cifs documentation, and user guide.
s) Addressing bugs found by running a broader set of xfstests in standard
-file system xfstest suite.
+ file system xfstest suite.
t) split cifs and smb3 support into separate modules so legacy (and less
-secure) CIFS dialect can be disabled in environments that don't need it
-and simplify the code.
+ secure) CIFS dialect can be disabled in environments that don't need it
+ and simplify the code.
v) POSIX Extensions for SMB3.1.1 (started, create and mkdir support added
-so far).
+ so far).
w) Add support for additional strong encryption types, and additional spnego
-authentication mechanisms (see MS-SMB2)
+ authentication mechanisms (see MS-SMB2)
+
+Known Bugs
+==========
-KNOWN BUGS
-====================================
See http://bugzilla.samba.org - search on product "CifsVFS" for
current bug list. Also check http://bugzilla.kernel.org (Product = File System, Component = CIFS)
1) existing symbolic links (Windows reparse points) are recognized but
-can not be created remotely. They are implemented for Samba and those that
-support the CIFS Unix extensions, although earlier versions of Samba
-overly restrict the pathnames.
+ can not be created remotely. They are implemented for Samba and those that
+ support the CIFS Unix extensions, although earlier versions of Samba
+ overly restrict the pathnames.
2) follow_link and readdir code does not follow dfs junctions
-but recognizes them
+ but recognizes them
Misc testing to do
==================
1) check out max path names and max path name components against various server
-types. Try nested symlinks (8 deep). Return max path name in stat -f information
+ types. Try nested symlinks (8 deep). Return max path name in stat -f information
2) Improve xfstest's cifs/smb3 enablement and adapt xfstests where needed to test
-cifs/smb3 better
+ cifs/smb3 better
-3) Additional performance testing and optimization using iozone and similar -
-there are some easy changes that can be done to parallelize sequential writes,
-and when signing is disabled to request larger read sizes (larger than
-negotiated size) and send larger write sizes to modern servers.
+3) Additional performance testing and optimization using iozone and similar -
+ there are some easy changes that can be done to parallelize sequential writes,
+ and when signing is disabled to request larger read sizes (larger than
+ negotiated size) and send larger write sizes to modern servers.
4) More exhaustively test against less common servers
5) Continue to extend the smb3 "buildbot" which does automated xfstesting
-against Windows, Samba and Azure currently - to add additional tests and
-to allow the buildbot to execute the tests faster. The URL for the
-buildbot is: http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com
+ against Windows, Samba and Azure currently - to add additional tests and
+ to allow the buildbot to execute the tests faster. The URL for the
+ buildbot is: http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com
6) Address various coverity warnings (most are not bugs per-se, but
-the more warnings are addressed, the easier it is to spot real
-problems that static analyzers will point out in the future).
+ the more warnings are addressed, the easier it is to spot real
+ problems that static analyzers will point out in the future).
similarity index 72%
rename from Documentation/filesystems/cifs/README
rename to Documentation/admin-guide/cifs/usage.rst
@@ -1,53 +1,61 @@
+=====
+Usage
+=====
+
This module supports the SMB3 family of advanced network protocols (as well
as older dialects, originally called "CIFS" or SMB1).
The CIFS VFS module for Linux supports many advanced network filesystem
features such as hierarchical DFS like namespace, hardlinks, locking and more.
-It was designed to comply with the SNIA CIFS Technical Reference (which
-supersedes the 1992 X/Open SMB Standard) as well as to perform best practice
-practical interoperability with Windows 2000, Windows XP, Samba and equivalent
+It was designed to comply with the SNIA CIFS Technical Reference (which
+supersedes the 1992 X/Open SMB Standard) as well as to perform best practice
+practical interoperability with Windows 2000, Windows XP, Samba and equivalent
servers. This code was developed in participation with the Protocol Freedom
Information Foundation. CIFS and now SMB3 has now become a defacto
standard for interoperating between Macs and Windows and major NAS appliances.
Please see
- MS-SMB2 (for detailed SMB2/SMB3/SMB3.1.1 protocol specification)
- http://protocolfreedom.org/ and
- http://samba.org/samba/PFIF/
+MS-SMB2 (for detailed SMB2/SMB3/SMB3.1.1 protocol specification)
+http://protocolfreedom.org/ and
+http://samba.org/samba/PFIF/
for more details.
For questions or bug reports please contact:
+
smfrench@gmail.com
See the project page at: https://wiki.samba.org/index.php/LinuxCIFS_utils
-Build instructions:
+Build instructions
==================
+
For Linux:
+
1) Download the kernel (e.g. from http://www.kernel.org)
-and change directory into the top of the kernel directory tree
-(e.g. /usr/src/linux-2.5.73)
+ and change directory into the top of the kernel directory tree
+ (e.g. /usr/src/linux-2.5.73)
2) make menuconfig (or make xconfig)
3) select cifs from within the network filesystem choices
4) save and exit
5) make
-Installation instructions:
+Installation instructions
=========================
+
If you have built the CIFS vfs as module (successfully) simply
-type "make modules_install" (or if you prefer, manually copy the file to
+type ``make modules_install`` (or if you prefer, manually copy the file to
the modules directory e.g. /lib/modules/2.4.10-4GB/kernel/fs/cifs/cifs.ko).
If you have built the CIFS vfs into the kernel itself, follow the instructions
for your distribution on how to install a new kernel (usually you
-would simply type "make install").
+would simply type ``make install``).
If you do not have the utility mount.cifs (in the Samba 4.x source tree and on
the CIFS VFS web site) copy it to the same directory in which mount helpers
reside (usually /sbin). Although the helper software is not
-required, mount.cifs is recommended. Most distros include a "cifs-utils"
+required, mount.cifs is recommended. Most distros include a ``cifs-utils``
package that includes this utility so it is recommended to install this.
Note that running the Winbind pam/nss module (logon service) on all of your
@@ -57,13 +65,16 @@ found at cifs-utils.git on git.samba.org
If cifs is built as a module, then the size and number of network buffers
and maximum number of simultaneous requests to one server can be configured.
-Changing these from their defaults is not recommended. By executing modinfo
+Changing these from their defaults is not recommended. By executing modinfo::
+
modinfo kernel/fs/cifs/cifs.ko
+
on kernel/fs/cifs/cifs.ko the list of configuration changes that can be made
at module initialization time (by running insmod cifs.ko) can be seen.
Recommendations
===============
+
To improve security the SMB2.1 dialect or later (usually will get SMB3) is now
the new default. To use old dialects (e.g. to mount Windows XP) use "vers=1.0"
on mount (or vers=2.0 for Windows Vista). Note that the CIFS (vers=1.0) is
@@ -72,156 +83,168 @@ many advanced security features such as downgrade attack detection
and encrypted shares and stronger signing and authentication algorithms.
There are additional mount options that may be helpful for SMB3 to get
improved POSIX behavior (NB: can use vers=3.0 to force only SMB3, never 2.1):
- "mfsymlinks" and "cifsacl" and "idsfromsid"
+
+ ``mfsymlinks`` and ``cifsacl`` and ``idsfromsid``
Allowing User Mounts
====================
+
To permit users to mount and unmount over directories they own is possible
with the cifs vfs. A way to enable such mounting is to mark the mount.cifs
-utility as suid (e.g. "chmod +s /sbin/mount.cifs). To enable users to
+utility as suid (e.g. ``chmod +s /sbin/mount.cifs``). To enable users to
umount shares they mount requires
+
1) mount.cifs version 1.4 or later
2) an entry for the share in /etc/fstab indicating that a user may
-unmount it e.g.
-//server/usersharename /mnt/username cifs user 0 0
+ unmount it e.g.::
-Note that when the mount.cifs utility is run suid (allowing user mounts),
-in order to reduce risks, the "nosuid" mount flag is passed in on mount to
+ //server/usersharename /mnt/username cifs user 0 0
+
+Note that when the mount.cifs utility is run suid (allowing user mounts),
+in order to reduce risks, the ``nosuid`` mount flag is passed in on mount to
disallow execution of an suid program mounted on the remote target.
When mount is executed as root, nosuid is not passed in by default,
and execution of suid programs on the remote target would be enabled
-by default. This can be changed, as with nfs and other filesystems,
-by simply specifying "nosuid" among the mount options. For user mounts
-though to be able to pass the suid flag to mount requires rebuilding
+by default. This can be changed, as with nfs and other filesystems,
+by simply specifying ``nosuid`` among the mount options. For user mounts
+though to be able to pass the suid flag to mount requires rebuilding
mount.cifs with the following flag: CIFS_ALLOW_USR_SUID
There is a corresponding manual page for cifs mounting in the Samba 3.0 and
-later source tree in docs/manpages/mount.cifs.8
+later source tree in docs/manpages/mount.cifs.8
Allowing User Unmounts
======================
+
To permit users to ummount directories that they have user mounted (see above),
-the utility umount.cifs may be used. It may be invoked directly, or if
+the utility umount.cifs may be used. It may be invoked directly, or if
umount.cifs is placed in /sbin, umount can invoke the cifs umount helper
(at least for most versions of the umount utility) for umount of cifs
mounts, unless umount is invoked with -i (which will avoid invoking a umount
helper). As with mount.cifs, to enable user unmounts umount.cifs must be marked
-as suid (e.g. "chmod +s /sbin/umount.cifs") or equivalent (some distributions
+as suid (e.g. ``chmod +s /sbin/umount.cifs``) or equivalent (some distributions
allow adding entries to a file to the /etc/permissions file to achieve the
equivalent suid effect). For this utility to succeed the target path
must be a cifs mount, and the uid of the current user must match the uid
of the user who mounted the resource.
-Also note that the customary way of allowing user mounts and unmounts is
+Also note that the customary way of allowing user mounts and unmounts is
(instead of using mount.cifs and unmount.cifs as suid) to add a line
to the file /etc/fstab for each //server/share you wish to mount, but
this can become unwieldy when potential mount targets include many
or unpredictable UNC names.
-Samba Considerations
+Samba Considerations
====================
+
Most current servers support SMB2.1 and SMB3 which are more secure,
but there are useful protocol extensions for the older less secure CIFS
dialect, so to get the maximum benefit if mounting using the older dialect
(CIFS/SMB1), we recommend using a server that supports the SNIA CIFS
Unix Extensions standard (e.g. almost any version of Samba ie version
2.2.5 or later) but the CIFS vfs works fine with a wide variety of CIFS servers.
-Note that uid, gid and file permissions will display default values if you do
-not have a server that supports the Unix extensions for CIFS (such as Samba
-2.2.5 or later). To enable the Unix CIFS Extensions in the Samba server, add
-the line:
+Note that uid, gid and file permissions will display default values if you do
+not have a server that supports the Unix extensions for CIFS (such as Samba
+2.2.5 or later). To enable the Unix CIFS Extensions in the Samba server, add
+the line::
unix extensions = yes
-
-to your smb.conf file on the server. Note that the following smb.conf settings
-are also useful (on the Samba server) when the majority of clients are Unix or
-Linux:
+
+to your smb.conf file on the server. Note that the following smb.conf settings
+are also useful (on the Samba server) when the majority of clients are Unix or
+Linux::
case sensitive = yes
- delete readonly = yes
+ delete readonly = yes
ea support = yes
Note that server ea support is required for supporting xattrs from the Linux
-cifs client, and that EA support is present in later versions of Samba (e.g.
+cifs client, and that EA support is present in later versions of Samba (e.g.
3.0.6 and later (also EA support works in all versions of Windows, at least to
shares on NTFS filesystems). Extended Attribute (xattr) support is an optional
feature of most Linux filesystems which may require enabling via
make menuconfig. Client support for extended attributes (user xattr) can be
-disabled on a per-mount basis by specifying "nouser_xattr" on mount.
+disabled on a per-mount basis by specifying ``nouser_xattr`` on mount.
The CIFS client can get and set POSIX ACLs (getfacl, setfacl) to Samba servers
-version 3.10 and later. Setting POSIX ACLs requires enabling both XATTR and
+version 3.10 and later. Setting POSIX ACLs requires enabling both XATTR and
then POSIX support in the CIFS configuration options when building the cifs
module. POSIX ACL support can be disabled on a per mount basic by specifying
-"noacl" on mount.
-
-Some administrators may want to change Samba's smb.conf "map archive" and
-"create mask" parameters from the default. Unless the create mask is changed
+``noacl`` on mount.
+
+Some administrators may want to change Samba's smb.conf ``map archive`` and
+``create mask`` parameters from the default. Unless the create mask is changed
newly created files can end up with an unnecessarily restrictive default mode,
which may not be what you want, although if the CIFS Unix extensions are
enabled on the server and client, subsequent setattr calls (e.g. chmod) can
-fix the mode. Note that creating special devices (mknod) remotely
-may require specifying a mkdev function to Samba if you are not using
+fix the mode. Note that creating special devices (mknod) remotely
+may require specifying a mkdev function to Samba if you are not using
Samba 3.0.6 or later. For more information on these see the manual pages
-("man smb.conf") on the Samba server system. Note that the cifs vfs,
-unlike the smbfs vfs, does not read the smb.conf on the client system
-(the few optional settings are passed in on mount via -o parameters instead).
+(``man smb.conf``) on the Samba server system. Note that the cifs vfs,
+unlike the smbfs vfs, does not read the smb.conf on the client system
+(the few optional settings are passed in on mount via -o parameters instead).
Note that Samba 2.2.7 or later includes a fix that allows the CIFS VFS to delete
-open files (required for strict POSIX compliance). Windows Servers already
+open files (required for strict POSIX compliance). Windows Servers already
supported this feature. Samba server does not allow symlinks that refer to files
outside of the share, so in Samba versions prior to 3.0.6, most symlinks to
-files with absolute paths (ie beginning with slash) such as:
+files with absolute paths (ie beginning with slash) such as::
+
ln -s /mnt/foo bar
-would be forbidden. Samba 3.0.6 server or later includes the ability to create
-such symlinks safely by converting unsafe symlinks (ie symlinks to server
+
+would be forbidden. Samba 3.0.6 server or later includes the ability to create
+such symlinks safely by converting unsafe symlinks (ie symlinks to server
files that are outside of the share) to a samba specific format on the server
that is ignored by local server applications and non-cifs clients and that will
not be traversed by the Samba server). This is opaque to the Linux client
application using the cifs vfs. Absolute symlinks will work to Samba 3.0.5 or
later, but only for remote clients using the CIFS Unix extensions, and will
be invisbile to Windows clients and typically will not affect local
-applications running on the same server as Samba.
+applications running on the same server as Samba.
-Use instructions:
+Use instructions
================
-Once the CIFS VFS support is built into the kernel or installed as a module
+
+Once the CIFS VFS support is built into the kernel or installed as a module
(cifs.ko), you can use mount syntax like the following to access Samba or
-Mac or Windows servers:
+Mac or Windows servers::
mount -t cifs //9.53.216.11/e$ /mnt -o username=myname,password=mypassword
Before -o the option -v may be specified to make the mount.cifs
-mount helper display the mount steps more verbosely.
+mount helper display the mount steps more verbosely.
After -o the following commonly used cifs vfs specific options
-are supported:
+are supported::
username=<username>
password=<password>
domain=<domain name>
-
+
Other cifs mount options are described below. Use of TCP names (in addition to
ip addresses) is available if the mount helper (mount.cifs) is installed. If
you do not trust the server to which are mounted, or if you do not have
cifs signing enabled (and the physical network is insecure), consider use
-of the standard mount options "noexec" and "nosuid" to reduce the risk of
+of the standard mount options ``noexec`` and ``nosuid`` to reduce the risk of
running an altered binary on your local system (downloaded from a hostile server
or altered by a hostile router).
Although mounting using format corresponding to the CIFS URL specification is
not possible in mount.cifs yet, it is possible to use an alternate format
for the server and sharename (which is somewhat similar to NFS style mount
-syntax) instead of the more widely used UNC format (i.e. \\server\share):
+syntax) instead of the more widely used UNC format (i.e. \\server\share)::
+
mount -t cifs tcp_name_of_server:share_name /mnt -o user=myname,pass=mypasswd
When using the mount helper mount.cifs, passwords may be specified via alternate
-mechanisms, instead of specifying it after -o using the normal "pass=" syntax
+mechanisms, instead of specifying it after -o using the normal ``pass=`` syntax
on the command line:
1) By including it in a credential file. Specify credentials=filename as one
-of the mount options. Credential files contain two lines
- username=someuser
- password=your_password
+of the mount options. Credential files contain two lines::
+
+ username=someuser
+ password=your_password
+
2) By specifying the password in the PASSWD environment variable (similarly
-the user name can be taken from the USER environment variable).
+ the user name can be taken from the USER environment variable).
3) By specifying the password in a file by name via PASSWD_FILE
4) By specifying the password in a file by file descriptor via PASSWD_FD
@@ -229,39 +252,47 @@ If no password is provided, mount.cifs will prompt for password entry
Restrictions
============
-Servers must support either "pure-TCP" (port 445 TCP/IP CIFS connections) or RFC
-1001/1002 support for "Netbios-Over-TCP/IP." This is not likely to be a
+
+Servers must support either "pure-TCP" (port 445 TCP/IP CIFS connections) or RFC
+1001/1002 support for "Netbios-Over-TCP/IP." This is not likely to be a
problem as most servers support this.
Valid filenames differ between Windows and Linux. Windows typically restricts
-filenames which contain certain reserved characters (e.g.the character :
+filenames which contain certain reserved characters (e.g.the character :
which is used to delimit the beginning of a stream name by Windows), while
Linux allows a slightly wider set of valid characters in filenames. Windows
servers can remap such characters when an explicit mapping is specified in
-the Server's registry. Samba starting with version 3.10 will allow such
+the Server's registry. Samba starting with version 3.10 will allow such
filenames (ie those which contain valid Linux characters, which normally
would be forbidden for Windows/CIFS semantics) as long as the server is
configured for Unix Extensions (and the client has not disabled
/proc/fs/cifs/LinuxExtensionsEnabled). In addition the mount option
-"mapposix" can be used on CIFS (vers=1.0) to force the mapping of
+``mapposix`` can be used on CIFS (vers=1.0) to force the mapping of
illegal Windows/NTFS/SMB characters to a remap range (this mount parm
-is the default for SMB3). This remap ("mapposix") range is also
+is the default for SMB3). This remap (``mapposix``) range is also
compatible with Mac (and "Services for Mac" on some older Windows).
CIFS VFS Mount Options
======================
A partial list of the supported mount options follows:
- username The user name to use when trying to establish
+
+ username
+ The user name to use when trying to establish
the CIFS session.
- password The user password. If the mount helper is
+ password
+ The user password. If the mount helper is
installed, the user will be prompted for password
if not supplied.
- ip The ip address of the target server
- unc The target server Universal Network Name (export) to
- mount.
- domain Set the SMB/CIFS workgroup name prepended to the
+ ip
+ The ip address of the target server
+ unc
+ The target server Universal Network Name (export) to
+ mount.
+ domain
+ Set the SMB/CIFS workgroup name prepended to the
username during CIFS session establishment
- forceuid Set the default uid for inodes to the uid
+ forceuid
+ Set the default uid for inodes to the uid
passed in on mount. For mounts to servers
which do support the CIFS Unix extensions, such as a
properly configured Samba server, the server provides
@@ -276,32 +307,39 @@ A partial list of the supported mount options follows:
extensions, the default uid (and gid) returned on lookup
of existing files will be the uid (gid) of the person
who executed the mount (root, except when mount.cifs
- is configured setuid for user mounts) unless the "uid="
+ is configured setuid for user mounts) unless the ``uid=``
(gid) mount option is specified. Also note that permission
checks (authorization checks) on accesses to a file occur
at the server, but there are cases in which an administrator
may want to restrict at the client as well. For those
servers which do not report a uid/gid owner
(such as Windows), permissions can also be checked at the
- client, and a crude form of client side permission checking
- can be enabled by specifying file_mode and dir_mode on
+ client, and a crude form of client side permission checking
+ can be enabled by specifying file_mode and dir_mode on
the client. (default)
- forcegid (similar to above but for the groupid instead of uid) (default)
- noforceuid Fill in file owner information (uid) by requesting it from
+ forcegid
+ (similar to above but for the groupid instead of uid) (default)
+ noforceuid
+ Fill in file owner information (uid) by requesting it from
the server if possible. With this option, the value given in
the uid= option (on mount) will only be used if the server
can not support returning uids on inodes.
- noforcegid (similar to above but for the group owner, gid, instead of uid)
- uid Set the default uid for inodes, and indicate to the
+ noforcegid
+ (similar to above but for the group owner, gid, instead of uid)
+ uid
+ Set the default uid for inodes, and indicate to the
cifs kernel driver which local user mounted. If the server
supports the unix extensions the default uid is
not used to fill in the owner fields of inodes (files)
- unless the "forceuid" parameter is specified.
- gid Set the default gid for inodes (similar to above).
- file_mode If CIFS Unix extensions are not supported by the server
+ unless the ``forceuid`` parameter is specified.
+ gid
+ Set the default gid for inodes (similar to above).
+ file_mode
+ If CIFS Unix extensions are not supported by the server
this overrides the default mode for file inodes.
- fsc Enable local disk caching using FS-Cache (off by default). This
- option could be useful to improve performance on a slow link,
+ fsc
+ Enable local disk caching using FS-Cache (off by default). This
+ option could be useful to improve performance on a slow link,
heavily loaded server and/or network where reading from the
disk is faster than reading from the server (over the network).
This could also impact scalability positively as the
@@ -310,18 +348,22 @@ A partial list of the supported mount options follows:
type workloads. So, you need to consider carefully your
workload/scenario before using this option. Currently, local
disk caching is functional for CIFS files opened as read-only.
- dir_mode If CIFS Unix extensions are not supported by the server
+ dir_mode
+ If CIFS Unix extensions are not supported by the server
this overrides the default mode for directory inodes.
- port attempt to contact the server on this tcp port, before
+ port
+ attempt to contact the server on this tcp port, before
trying the usual ports (port 445, then 139).
- iocharset Codepage used to convert local path names to and from
+ iocharset
+ Codepage used to convert local path names to and from
Unicode. Unicode is used by default for network path
names if the server supports it. If iocharset is
not specified then the nls_default specified
during the local client kernel build will be used.
If server does not support Unicode, this parameter is
unused.
- rsize default read size (usually 16K). The client currently
+ rsize
+ default read size (usually 16K). The client currently
can not use rsize larger than CIFSMaxBufSize. CIFSMaxBufSize
defaults to 16K and may be changed (from 8K to the maximum
kmalloc size allowed by your kernel) at module install time
@@ -333,10 +375,12 @@ A partial list of the supported mount options follows:
newer servers (e.g. Samba 3.0.26 or later) do. rsize can be
set from a minimum of 2048 to a maximum of 130048 (127K or
CIFSMaxBufSize, whichever is smaller)
- wsize default write size (default 57344)
+ wsize
+ default write size (default 57344)
maximum wsize currently allowed by CIFS is 57344 (fourteen
4096 byte pages)
- actimeo=n attribute cache timeout in seconds (default 1 second).
+ actimeo=n
+ attribute cache timeout in seconds (default 1 second).
After this timeout, the cifs client requests fresh attribute
information from the server. This option allows to tune the
attribute cache timeout to suit the workload needs. Shorter
@@ -345,49 +389,67 @@ A partial list of the supported mount options follows:
of calls to the server at the expense of less stricter cache
coherency checks (i.e. incorrect attribute cache for a short
period of time).
- rw mount the network share read-write (note that the
+ rw
+ mount the network share read-write (note that the
server may still consider the share read-only)
- ro mount network share read-only
- version used to distinguish different versions of the
+ ro
+ mount network share read-only
+ version
+ used to distinguish different versions of the
mount helper utility (not typically needed)
- sep if first mount option (after the -o), overrides
+ sep
+ if first mount option (after the -o), overrides
the comma as the separator between the mount
- parms. e.g.
+ parms. e.g.::
+
-o user=myname,password=mypassword,domain=mydom
- could be passed instead with period as the separator by
+
+ could be passed instead with period as the separator by::
+
-o sep=.user=myname.password=mypassword.domain=mydom
+
this might be useful when comma is contained within username
or password or domain. This option is less important
when the cifs mount helper cifs.mount (version 1.1 or later)
is used.
- nosuid Do not allow remote executables with the suid bit
+ nosuid
+ Do not allow remote executables with the suid bit
program to be executed. This is only meaningful for mounts
to servers such as Samba which support the CIFS Unix Extensions.
If you do not trust the servers in your network (your mount
targets) it is recommended that you specify this option for
greater security.
- exec Permit execution of binaries on the mount.
- noexec Do not permit execution of binaries on the mount.
- dev Recognize block devices on the remote mount.
- nodev Do not recognize devices on the remote mount.
- suid Allow remote files on this mountpoint with suid enabled to
+ exec
+ Permit execution of binaries on the mount.
+ noexec
+ Do not permit execution of binaries on the mount.
+ dev
+ Recognize block devices on the remote mount.
+ nodev
+ Do not recognize devices on the remote mount.
+ suid
+ Allow remote files on this mountpoint with suid enabled to
be executed (default for mounts when executed as root,
nosuid is default for user mounts).
- credentials Although ignored by the cifs kernel component, it is used by
+ credentials
+ Although ignored by the cifs kernel component, it is used by
the mount helper, mount.cifs. When mount.cifs is installed it
- opens and reads the credential file specified in order
+ opens and reads the credential file specified in order
to obtain the userid and password arguments which are passed to
the cifs vfs.
- guest Although ignored by the kernel component, the mount.cifs
+ guest
+ Although ignored by the kernel component, the mount.cifs
mount helper will not prompt the user for a password
if guest is specified on the mount options. If no
password is specified a null password will be used.
- perm Client does permission checks (vfs_permission check of uid
+ perm
+ Client does permission checks (vfs_permission check of uid
and gid of the file against the mode and desired operation),
Note that this is in addition to the normal ACL check on the
- target machine done by the server software.
+ target machine done by the server software.
Client permission checking is enabled by default.
- noperm Client does not do permission checks. This can expose
+ noperm
+ Client does not do permission checks. This can expose
files on this mount to access by other users on the local
client system. It is typically only needed when the server
supports the CIFS Unix Extensions but the UIDs/GIDs on the
@@ -399,7 +461,8 @@ A partial list of the supported mount options follows:
Note that this does not affect the normal ACL check on the
target machine done by the server software (of the server
ACL against the user name provided at mount time).
- serverino Use server's inode numbers instead of generating automatically
+ serverino
+ Use server's inode numbers instead of generating automatically
incrementing inode numbers on the client. Although this will
make it easier to spot hardlinked files (as they will have
the same inode numbers) and inode numbers may be persistent,
@@ -412,14 +475,16 @@ A partial list of the supported mount options follows:
or the CIFS Unix Extensions equivalent and for those
this mount option will have no effect. Exporting cifs mounts
under nfsd requires this mount option on the cifs mount.
- This is now the default if server supports the
+ This is now the default if server supports the
required network operation.
- noserverino Client generates inode numbers (rather than using the actual one
+ noserverino
+ Client generates inode numbers (rather than using the actual one
from the server). These inode numbers will vary after
unmount or reboot which can confuse some applications,
but not all server filesystems support unique inode
numbers.
- setuids If the CIFS Unix extensions are negotiated with the server
+ setuids
+ If the CIFS Unix extensions are negotiated with the server
the client will attempt to set the effective uid and gid of
the local process on newly created files, directories, and
devices (create, mkdir, mknod). If the CIFS Unix Extensions
@@ -427,9 +492,10 @@ A partial list of the supported mount options follows:
instead of using the default uid and gid specified on
the mount, cache the new file's uid and gid locally which means
that the uid for the file can change when the inode is
- reloaded (or the user remounts the share).
- nosetuids The client will not attempt to set the uid and gid on
- on newly created files, directories, and devices (create,
+ reloaded (or the user remounts the share).
+ nosetuids
+ The client will not attempt to set the uid and gid on
+ on newly created files, directories, and devices (create,
mkdir, mknod) which will result in the server setting the
uid and gid to the default (usually the server uid of the
user who mounted the share). Letting the server (rather than
@@ -437,38 +503,49 @@ A partial list of the supported mount options follows:
Unix Extensions are not negotiated then the uid and gid for
new files will appear to be the uid (gid) of the mounter or the
uid (gid) parameter specified on the mount.
- netbiosname When mounting to servers via port 139, specifies the RFC1001
- source name to use to represent the client netbios machine
+ netbiosname
+ When mounting to servers via port 139, specifies the RFC1001
+ source name to use to represent the client netbios machine
name when doing the RFC1001 netbios session initialize.
- direct Do not do inode data caching on files opened on this mount.
+ direct
+ Do not do inode data caching on files opened on this mount.
This precludes mmapping files on this mount. In some cases
with fast networks and little or no caching benefits on the
client (e.g. when the application is doing large sequential
- reads bigger than page size without rereading the same data)
+ reads bigger than page size without rereading the same data)
this can provide better performance than the default
- behavior which caches reads (readahead) and writes
- (writebehind) through the local Linux client pagecache
+ behavior which caches reads (readahead) and writes
+ (writebehind) through the local Linux client pagecache
if oplock (caching token) is granted and held. Note that
direct allows write operations larger than page size
to be sent to the server.
- strictcache Use for switching on strict cache mode. In this mode the
+ strictcache
+ Use for switching on strict cache mode. In this mode the
client read from the cache all the time it has Oplock Level II,
otherwise - read from the server. All written data are stored
in the cache, but if the client doesn't have Exclusive Oplock,
it writes the data to the server.
- rwpidforward Forward pid of a process who opened a file to any read or write
+ rwpidforward
+ Forward pid of a process who opened a file to any read or write
operation on that file. This prevent applications like WINE
from failing on read and write if we use mandatory brlock style.
- acl Allow setfacl and getfacl to manage posix ACLs if server
+ acl
+ Allow setfacl and getfacl to manage posix ACLs if server
supports them. (default)
- noacl Do not allow setfacl and getfacl calls on this mount
- user_xattr Allow getting and setting user xattrs (those attributes whose
- name begins with "user." or "os2.") as OS/2 EAs (extended
+ noacl
+ Do not allow setfacl and getfacl calls on this mount
+ user_xattr
+ Allow getting and setting user xattrs (those attributes whose
+ name begins with ``user.`` or ``os2.``) as OS/2 EAs (extended
attributes) to the server. This allows support of the
setfattr and getfattr utilities. (default)
- nouser_xattr Do not allow getfattr/setfattr to get/set/list xattrs
- mapchars Translate six of the seven reserved characters (not backslash)
+ nouser_xattr
+ Do not allow getfattr/setfattr to get/set/list xattrs
+ mapchars
+ Translate six of the seven reserved characters (not backslash)::
+
*?<>|:
+
to the remap range (above 0xF000), which also
allows the CIFS client to recognize files created with
such characters by Windows's POSIX emulation. This can
@@ -477,39 +554,47 @@ A partial list of the supported mount options follows:
whose names contain any of these seven characters).
This has no effect if the server does not support
Unicode on the wire.
- nomapchars Do not translate any of these seven characters (default).
- nocase Request case insensitive path name matching (case
+ nomapchars
+ Do not translate any of these seven characters (default).
+ nocase
+ Request case insensitive path name matching (case
sensitive is the default if the server supports it).
- (mount option "ignorecase" is identical to "nocase")
- posixpaths If CIFS Unix extensions are supported, attempt to
+ (mount option ``ignorecase`` is identical to ``nocase``)
+ posixpaths
+ If CIFS Unix extensions are supported, attempt to
negotiate posix path name support which allows certain
characters forbidden in typical CIFS filenames, without
requiring remapping. (default)
- noposixpaths If CIFS Unix extensions are supported, do not request
+ noposixpaths
+ If CIFS Unix extensions are supported, do not request
posix path name support (this may cause servers to
reject creatingfile with certain reserved characters).
- nounix Disable the CIFS Unix Extensions for this mount (tree
+ nounix
+ Disable the CIFS Unix Extensions for this mount (tree
connection). This is rarely needed, but it may be useful
in order to turn off multiple settings all at once (ie
posix acls, posix locks, posix paths, symlink support
and retrieving uids/gids/mode from the server) or to
work around a bug in server which implement the Unix
Extensions.
- nobrl Do not send byte range lock requests to the server.
+ nobrl
+ Do not send byte range lock requests to the server.
This is necessary for certain applications that break
with cifs style mandatory byte range locks (and most
cifs servers do not yet support requesting advisory
byte range locks).
- forcemandatorylock Even if the server supports posix (advisory) byte range
+ forcemandatorylock
+ Even if the server supports posix (advisory) byte range
locking, send only mandatory lock requests. For some
(presumably rare) applications, originally coded for
DOS/Windows, which require Windows style mandatory byte range
locking, they may be able to take advantage of this option,
forcing the cifs client to only send mandatory locks
even if the cifs server would support posix advisory locks.
- "forcemand" is accepted as a shorter form of this mount
+ ``forcemand`` is accepted as a shorter form of this mount
option.
- nostrictsync If this mount option is set, when an application does an
+ nostrictsync
+ If this mount option is set, when an application does an
fsync call then the cifs client does not send an SMB Flush
to the server (to force the server to write all dirty data
for this file immediately to disk), although cifs still sends
@@ -522,41 +607,50 @@ A partial list of the supported mount options follows:
crash. If this mount option is not set, by default cifs will
send an SMB flush request (and wait for a response) on every
fsync call.
- nodfs Disable DFS (global name space support) even if the
+ nodfs
+ Disable DFS (global name space support) even if the
server claims to support it. This can help work around
a problem with parsing of DFS paths with Samba server
versions 3.0.24 and 3.0.25.
- remount remount the share (often used to change from ro to rw mounts
- or vice versa)
- cifsacl Report mode bits (e.g. on stat) based on the Windows ACL for
- the file. (EXPERIMENTAL)
- servern Specify the server 's netbios name (RFC1001 name) to use
- when attempting to setup a session to the server.
+ remount
+ remount the share (often used to change from ro to rw mounts
+ or vice versa)
+ cifsacl
+ Report mode bits (e.g. on stat) based on the Windows ACL for
+ the file. (EXPERIMENTAL)
+ servern
+ Specify the server 's netbios name (RFC1001 name) to use
+ when attempting to setup a session to the server.
This is needed for mounting to some older servers (such
as OS/2 or Windows 98 and Windows ME) since they do not
support a default server name. A server name can be up
to 15 characters long and is usually uppercased.
- sfu When the CIFS Unix Extensions are not negotiated, attempt to
+ sfu
+ When the CIFS Unix Extensions are not negotiated, attempt to
create device files and fifos in a format compatible with
Services for Unix (SFU). In addition retrieve bits 10-12
of the mode via the SETFILEBITS extended attribute (as
SFU does). In the future the bottom 9 bits of the
mode also will be emulated using queries of the security
descriptor (ACL).
- mfsymlinks Enable support for Minshall+French symlinks
+ mfsymlinks
+ Enable support for Minshall+French symlinks
(see http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks)
This option is ignored when specified together with the
'sfu' option. Minshall+French symlinks are used even if
the server supports the CIFS Unix Extensions.
- sign Must use packet signing (helps avoid unwanted data modification
+ sign
+ Must use packet signing (helps avoid unwanted data modification
by intermediate systems in the route). Note that signing
does not work with lanman or plaintext authentication.
- seal Must seal (encrypt) all data on this mounted share before
+ seal
+ Must seal (encrypt) all data on this mounted share before
sending on the network. Requires support for Unix Extensions.
Note that this differs from the sign mount option in that it
causes encryption of data sent over this mounted share but other
shares mounted to the same server are unaffected.
- locallease This option is rarely needed. Fcntl F_SETLEASE is
+ locallease
+ This option is rarely needed. Fcntl F_SETLEASE is
used by some applications such as Samba and NFSv4 server to
check to see whether a file is cacheable. CIFS has no way
to explicitly request a lease, but can check whether a file
@@ -569,51 +663,73 @@ A partial list of the supported mount options follows:
will allow the cifs client to check for leases (only) locally
for files which are not oplocked instead of denying leases
in that case. (EXPERIMENTAL)
- sec Security mode. Allowed values are:
- none attempt to connection as a null user (no name)
- krb5 Use Kerberos version 5 authentication
- krb5i Use Kerberos authentication and packet signing
- ntlm Use NTLM password hashing (default)
- ntlmi Use NTLM password hashing with signing (if
+ sec
+ Security mode. Allowed values are:
+
+ none
+ attempt to connection as a null user (no name)
+ krb5
+ Use Kerberos version 5 authentication
+ krb5i
+ Use Kerberos authentication and packet signing
+ ntlm
+ Use NTLM password hashing (default)
+ ntlmi
+ Use NTLM password hashing with signing (if
/proc/fs/cifs/PacketSigningEnabled on or if
- server requires signing also can be the default)
- ntlmv2 Use NTLMv2 password hashing
- ntlmv2i Use NTLMv2 password hashing with packet signing
- lanman (if configured in kernel config) use older
+ server requires signing also can be the default)
+ ntlmv2
+ Use NTLMv2 password hashing
+ ntlmv2i
+ Use NTLMv2 password hashing with packet signing
+ lanman
+ (if configured in kernel config) use older
lanman hash
-hard Retry file operations if server is not responding
-soft Limit retries to unresponsive servers (usually only
+ hard
+ Retry file operations if server is not responding
+ soft
+ Limit retries to unresponsive servers (usually only
one retry) before returning an error. (default)
The mount.cifs mount helper also accepts a few mount options before -o
including:
+=============== ===============================================================
-S take password from stdin (equivalent to setting the environment
- variable "PASSWD_FD=0"
+ variable ``PASSWD_FD=0``
-V print mount.cifs version
-? display simple usage information
+=============== ===============================================================
With most 2.6 kernel versions of modutils, the version of the cifs kernel
module can be displayed via modinfo.
Misc /proc/fs/cifs Flags and Debug Info
=======================================
+
Informational pseudo-files:
+
+======================= =======================================================
DebugData Displays information about active CIFS sessions and
shares, features enabled as well as the cifs.ko
version.
Stats Lists summary resource usage information as well as per
share statistics.
+======================= =======================================================
Configuration pseudo-files:
+
+======================= =======================================================
SecurityFlags Flags which control security negotiation and
also packet signing. Authentication (may/must)
flags (e.g. for NTLM and/or NTLMv2) may be combined with
the signing flags. Specifying two different password
- hashing mechanisms (as "must use") on the other hand
- does not make much sense. Default flags are
- 0x07007
- (NTLM, NTLMv2 and packet signing allowed). The maximum
+ hashing mechanisms (as "must use") on the other hand
+ does not make much sense. Default flags are::
+
+ 0x07007
+
+ (NTLM, NTLMv2 and packet signing allowed). The maximum
allowable flags if you want to allow mounts to servers
using weaker password hashes is 0x37037 (lanman,
plaintext, ntlm, ntlmv2, signing allowed). Some
@@ -626,21 +742,21 @@ SecurityFlags Flags which control security negotiation and
laintext passwords using the older lanman dialect
form of the session setup SMB. (e.g. for authentication
using plain text passwords, set the SecurityFlags
- to 0x30030):
-
- may use packet signing 0x00001
- must use packet signing 0x01001
- may use NTLM (most common password hash) 0x00002
- must use NTLM 0x02002
- may use NTLMv2 0x00004
- must use NTLMv2 0x04004
- may use Kerberos security 0x00008
- must use Kerberos 0x08008
- may use lanman (weak) password hash 0x00010
- must use lanman password hash 0x10010
- may use plaintext passwords 0x00020
- must use plaintext passwords 0x20020
- (reserved for future packet encryption) 0x00040
+ to 0x30030)::
+
+ may use packet signing 0x00001
+ must use packet signing 0x01001
+ may use NTLM (most common password hash) 0x00002
+ must use NTLM 0x02002
+ may use NTLMv2 0x00004
+ must use NTLMv2 0x04004
+ may use Kerberos security 0x00008
+ must use Kerberos 0x08008
+ may use lanman (weak) password hash 0x00010
+ must use lanman password hash 0x10010
+ may use plaintext passwords 0x00020
+ must use plaintext passwords 0x20020
+ (reserved for future packet encryption) 0x00040
cifsFYI If set to non-zero value, additional debug information
will be logged to the system error log. This field
@@ -650,14 +766,19 @@ cifsFYI If set to non-zero value, additional debug information
Some debugging statements are not compiled into the
cifs kernel unless CONFIG_CIFS_DEBUG2 is enabled in the
kernel configuration. cifsFYI may be set to one or
- nore of the following flags (7 sets them all):
+ nore of the following flags (7 sets them all)::
+
+ +-----------------------------------------------+------+
+ | log cifs informational messages | 0x01 |
+ +-----------------------------------------------+------+
+ | log return codes from cifs entry points | 0x02 |
+ +-----------------------------------------------+------+
+ | log slow responses | 0x04 |
+ | (ie which take longer than 1 second) | |
+ | | |
+ | CONFIG_CIFS_STATS2 must be enabled in .config | |
+ +-----------------------------------------------+------+
- log cifs informational messages 0x01
- log return codes from cifs entry points 0x02
- log slow responses (ie which take longer than 1 second)
- CONFIG_CIFS_STATS2 must be enabled in .config 0x04
-
-
traceSMB If set to one, debug information is logged to the
system error log with the start of smb requests
and responses (default 0)
@@ -671,24 +792,25 @@ LinuxExtensionsEnabled If set to one then the client will attempt to
as support symbolic links. If you use servers
such as Samba that support the CIFS Unix
extensions but do not want to use symbolic link
- support and want to map the uid and gid fields
- to values supplied at mount (rather than the
+ support and want to map the uid and gid fields
+ to values supplied at mount (rather than the
actual values, then set this to zero. (default 1)
+======================= =======================================================
-These experimental features and tracing can be enabled by changing flags in
-/proc/fs/cifs (after the cifs module has been installed or built into the
-kernel, e.g. insmod cifs). To enable a feature set it to 1 e.g. to enable
-tracing to the kernel message log type:
+These experimental features and tracing can be enabled by changing flags in
+/proc/fs/cifs (after the cifs module has been installed or built into the
+kernel, e.g. insmod cifs). To enable a feature set it to 1 e.g. to enable
+tracing to the kernel message log type::
echo 7 > /proc/fs/cifs/cifsFYI
-
+
cifsFYI functions as a bit mask. Setting it to 1 enables additional kernel
logging of various informational messages. 2 enables logging of non-zero
SMB return codes while 4 enables logging of requests that take longer
-than one second to complete (except for byte range lock requests).
+than one second to complete (except for byte range lock requests).
Setting it to 4 requires CONFIG_CIFS_STATS2 to be set in kernel configuration
(.config). Setting it to seven enables all three. Finally, tracing
-the start of smb requests and responses can be enabled via:
+the start of smb requests and responses can be enabled via::
echo 1 > /proc/fs/cifs/traceSMB
@@ -700,10 +822,10 @@ server) SMB3 (or cifs) requests grouped by request type (read, write, close etc.
Also recorded is the total bytes read and bytes written to the server for
that share. Note that due to client caching effects this can be less than the
number of bytes read and written by the application running on the client.
-Statistics can be reset to zero by "echo 0 > /proc/fs/cifs/Stats" which may be
+Statistics can be reset to zero by ``echo 0 > /proc/fs/cifs/Stats`` which may be
useful if comparing performance of two different scenarios.
-
-Also note that "cat /proc/fs/cifs/DebugData" will display information about
+
+Also note that ``cat /proc/fs/cifs/DebugData`` will display information about
the active sessions and the shares that are mounted.
Enabling Kerberos (extended security) works but requires version 1.2 or later
@@ -725,19 +847,23 @@ space to ease network configuration and improve reliability.
To use cifs Kerberos and DFS support, the Linux keyutils package should be
installed and something like the following lines should be added to the
-/etc/request-key.conf file:
+/etc/request-key.conf file::
-create cifs.spnego * * /usr/local/sbin/cifs.upcall %k
-create dns_resolver * * /usr/local/sbin/cifs.upcall %k
+ create cifs.spnego * * /usr/local/sbin/cifs.upcall %k
+ create dns_resolver * * /usr/local/sbin/cifs.upcall %k
CIFS kernel module parameters
=============================
These module parameters can be specified or modified either during the time of
-module loading or during the runtime by using the interface
+module loading or during the runtime by using the interface::
+
/proc/module/cifs/parameters/<param>
-i.e. echo "value" > /sys/module/cifs/parameters/<param>
+i.e.::
-1. enable_oplocks - Enable or disable oplocks. Oplocks are enabled by default.
- [Y/y/1]. To disable use any of [N/n/0].
+ echo "value" > /sys/module/cifs/parameters/<param>
+================= ==========================================================
+1. enable_oplocks Enable or disable oplocks. Oplocks are enabled by default.
+ [Y/y/1]. To disable use any of [N/n/0].
+================= ==========================================================
similarity index 100%
rename from Documentation/filesystems/cifs/winucase_convert.pl
rename to Documentation/admin-guide/cifs/winucase_convert.pl
@@ -77,6 +77,7 @@ configure specific aspects of kernel behavior to your liking.
blockdev/index
ext4
binderfs
+ cifs/index
xfs
pm/index
thunderbolt
@@ -4099,7 +4099,7 @@ L: samba-technical@lists.samba.org (moderated for non-subscribers)
W: http://linux-cifs.samba.org/
T: git git://git.samba.org/sfrench/cifs-2.6.git
S: Supported
-F: Documentation/filesystems/cifs/
+F: Documentation/admin-guide/cifs/
F: fs/cifs/
COMPACTPCI HOTPLUG CORE
The filenames for cifs documentation is not using the same convention as almost all Kernel documents is using. So, rename them to a more appropriate name. Then, manually convert the documentation files for CIFS to ReST. By doing a manual conversion, we can preserve the original author's style, while making it to look more like the other Kernel documents. Most of the conversion here is trivial. The most complex one was the README file (which was renamed to usage.rst). Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> --- .../AUTHORS => admin-guide/cifs/authors.rst} | 64 +- .../CHANGES => admin-guide/cifs/changes.rst} | 4 + Documentation/admin-guide/cifs/index.rst | 21 + .../cifs/introduction.rst} | 8 + .../cifs/TODO => admin-guide/cifs/todo.rst} | 87 +-- .../README => admin-guide/cifs/usage.rst} | 560 +++++++++++------- .../cifs/winucase_convert.pl | 0 Documentation/admin-guide/index.rst | 1 + MAINTAINERS | 2 +- 9 files changed, 460 insertions(+), 287 deletions(-) rename Documentation/{filesystems/cifs/AUTHORS => admin-guide/cifs/authors.rst} (60%) rename Documentation/{filesystems/cifs/CHANGES => admin-guide/cifs/changes.rst} (91%) create mode 100644 Documentation/admin-guide/cifs/index.rst rename Documentation/{filesystems/cifs/cifs.txt => admin-guide/cifs/introduction.rst} (98%) rename Documentation/{filesystems/cifs/TODO => admin-guide/cifs/todo.rst} (58%) rename Documentation/{filesystems/cifs/README => admin-guide/cifs/usage.rst} (72%) rename Documentation/{filesystems => admin-guide}/cifs/winucase_convert.pl (100%)