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CIFS/SMB3: Update documentation to reflect SMB3 and various changes
Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
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Steve French
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@ -41,6 +41,11 @@ Igor Mammedov (DFS support)
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Jeff Layton (many, many fixes, as well as great work on the cifs Kerberos code)
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Scott Lovenberg
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Pavel Shilovsky (for great work adding SMB2 support, and various SMB3 features)
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Aurelien Aptel (for DFS SMB3 work and some key bug fixes)
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Ronnie Sahlberg (for SMB3 xattr work and bug fixes)
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Shirish Pargaonkar (for many ACL patches over the years)
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Sachin Prabhu (many bug fixes, including for reconnect, copy offload and security)
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Test case and Bug Report contributors
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-------------------------------------
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@ -1,10 +1,14 @@
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The CIFS VFS support for Linux supports many advanced network filesystem
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features such as hierarchical dfs like namespace, hardlinks, locking and more.
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This module supports the SMB3 family of advanced network protocols (as well
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as older dialects, originally called "CIFS" or SMB1).
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The CIFS VFS module for Linux supports many advanced network filesystem
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features such as hierarchical DFS like namespace, hardlinks, locking and more.
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It was designed to comply with the SNIA CIFS Technical Reference (which
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supersedes the 1992 X/Open SMB Standard) as well as to perform best practice
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practical interoperability with Windows 2000, Windows XP, Samba and equivalent
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servers. This code was developed in participation with the Protocol Freedom
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Information Foundation.
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Information Foundation. CIFS and now SMB3 has now become a defacto
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standard for interoperating between Macs and Windows and major NAS appliances.
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Please see
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http://protocolfreedom.org/ and
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@ -15,30 +19,11 @@ for more details.
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For questions or bug reports please contact:
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sfrench@samba.org (sfrench@us.ibm.com)
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See the project page at: https://wiki.samba.org/index.php/LinuxCIFS_utils
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Build instructions:
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==================
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For Linux 2.4:
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1) Get the kernel source (e.g.from http://www.kernel.org)
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and download the cifs vfs source (see the project page
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at http://us1.samba.org/samba/Linux_CIFS_client.html)
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and change directory into the top of the kernel directory
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then patch the kernel (e.g. "patch -p1 < cifs_24.patch")
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to add the cifs vfs to your kernel configure options if
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it has not already been added (e.g. current SuSE and UL
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users do not need to apply the cifs_24.patch since the cifs vfs is
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already in the kernel configure menu) and then
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mkdir linux/fs/cifs and then copy the current cifs vfs files from
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the cifs download to your kernel build directory e.g.
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cp <cifs_download_dir>/fs/cifs/* to <kernel_download_dir>/fs/cifs
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2) make menuconfig (or make xconfig)
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3) select cifs from within the network filesystem choices
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4) save and exit
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5) make dep
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6) make modules (or "make" if CIFS VFS not to be built as a module)
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For Linux 2.6:
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For Linux:
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1) Download the kernel (e.g. from http://www.kernel.org)
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and change directory into the top of the kernel directory tree
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(e.g. /usr/src/linux-2.5.73)
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@ -61,16 +46,13 @@ would simply type "make install").
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If you do not have the utility mount.cifs (in the Samba 3.0 source tree and on
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the CIFS VFS web site) copy it to the same directory in which mount.smbfs and
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similar files reside (usually /sbin). Although the helper software is not
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required, mount.cifs is recommended. Eventually the Samba 3.0 utility program
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"net" may also be helpful since it may someday provide easier mount syntax for
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users who are used to Windows e.g.
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net use <mount point> <UNC name or cifs URL>
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required, mount.cifs is recommended. Most distros include a "cifs-utils"
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package that includes this utility so it is recommended to install this.
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Note that running the Winbind pam/nss module (logon service) on all of your
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Linux clients is useful in mapping Uids and Gids consistently across the
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domain to the proper network user. The mount.cifs mount helper can be
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trivially built from Samba 3.0 or later source e.g. by executing:
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gcc samba/source/client/mount.cifs.c -o mount.cifs
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found at cifs-utils.git on git.samba.org
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If cifs is built as a module, then the size and number of network buffers
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and maximum number of simultaneous requests to one server can be configured.
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@ -79,6 +61,18 @@ Changing these from their defaults is not recommended. By executing modinfo
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on kernel/fs/cifs/cifs.ko the list of configuration changes that can be made
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at module initialization time (by running insmod cifs.ko) can be seen.
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Recommendations
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===============
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To improve security the SMB2.1 dialect or later (usually will get SMB3) is now
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the new default. To use old dialects (e.g. to mount Windows XP) use "vers=1.0"
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on mount (or vers=2.0 for Windows Vista). Note that the CIFS (vers=1.0) is
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much older and less secure than the default dialect SMB3 which includes
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many advanced security features such as downgrade attack detection
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and encrypted shares and stronger signing and authentication algorithms.
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There are additional mount options that may be helpful for SMB3 to get
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improved POSIX behavior (NB: can use vers=3.0 to force only SMB3, never 2.1):
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"mfsymlinks" and "cifsacl" and "idsfromsid"
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Allowing User Mounts
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====================
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To permit users to mount and unmount over directories they own is possible
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@ -98,9 +92,7 @@ and execution of suid programs on the remote target would be enabled
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by default. This can be changed, as with nfs and other filesystems,
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by simply specifying "nosuid" among the mount options. For user mounts
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though to be able to pass the suid flag to mount requires rebuilding
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mount.cifs with the following flag:
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gcc samba/source/client/mount.cifs.c -DCIFS_ALLOW_USR_SUID -o mount.cifs
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mount.cifs with the following flag: CIFS_ALLOW_USR_SUID
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There is a corresponding manual page for cifs mounting in the Samba 3.0 and
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later source tree in docs/manpages/mount.cifs.8
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@ -189,18 +181,18 @@ applications running on the same server as Samba.
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Use instructions:
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================
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Once the CIFS VFS support is built into the kernel or installed as a module
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(cifs.o), you can use mount syntax like the following to access Samba or Windows
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servers:
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(cifs.ko), you can use mount syntax like the following to access Samba or
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Mac or Windows servers:
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mount -t cifs //9.53.216.11/e$ /mnt -o user=myname,pass=mypassword
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mount -t cifs //9.53.216.11/e$ /mnt -o username=myname,password=mypassword
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Before -o the option -v may be specified to make the mount.cifs
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mount helper display the mount steps more verbosely.
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After -o the following commonly used cifs vfs specific options
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are supported:
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user=<username>
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pass=<password>
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username=<username>
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password=<password>
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domain=<domain name>
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Other cifs mount options are described below. Use of TCP names (in addition to
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@ -246,13 +238,16 @@ the Server's registry. Samba starting with version 3.10 will allow such
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filenames (ie those which contain valid Linux characters, which normally
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would be forbidden for Windows/CIFS semantics) as long as the server is
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configured for Unix Extensions (and the client has not disabled
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/proc/fs/cifs/LinuxExtensionsEnabled).
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/proc/fs/cifs/LinuxExtensionsEnabled). In addition the mount option
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"mapposix" can be used on CIFS (vers=1.0) to force the mapping of
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illegal Windows/NTFS/SMB characters to a remap range (this mount parm
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is the default for SMB3). This remap ("mapposix") range is also
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compatible with Mac (and "Services for Mac" on some older Windows).
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CIFS VFS Mount Options
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======================
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A partial list of the supported mount options follows:
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user The user name to use when trying to establish
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username The user name to use when trying to establish
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the CIFS session.
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password The user password. If the mount helper is
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installed, the user will be prompted for password
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@ -1,4 +1,4 @@
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Version 2.03 August 1, 2014
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Version 2.04 September 13, 2017
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A Partial List of Missing Features
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==================================
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@ -8,73 +8,69 @@ for visible, important contributions to this module. Here
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is a partial list of the known problems and missing features:
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a) SMB3 (and SMB3.02) missing optional features:
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- RDMA
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- RDMA (started)
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- multichannel (started)
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- directory leases (improved metadata caching)
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- T10 copy offload (copy chunk is only mechanism supported)
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- encrypted shares
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b) improved sparse file support
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c) Directory entry caching relies on a 1 second timer, rather than
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using FindNotify or equivalent. - (started)
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using Directory Leases
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d) quota support (needs minor kernel change since quota calls
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to make it to network filesystems or deviceless filesystems)
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e) improve support for very old servers (OS/2 and Win9x for example)
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Including support for changing the time remotely (utimes command).
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e) Better optimize open to reduce redundant opens (using reference
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counts more) and to improve use of compounding in SMB3 to reduce
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number of roundtrips.
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f) hook lower into the sockets api (as NFS/SunRPC does) to avoid the
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extra copy in/out of the socket buffers in some cases.
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g) Better optimize open (and pathbased setfilesize) to reduce the
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oplock breaks coming from windows srv. Piggyback identical file
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opens on top of each other by incrementing reference count rather
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than resending (helps reduce server resource utilization and avoid
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spurious oplock breaks).
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h) Add support for storing symlink info to Windows servers
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in the Extended Attribute format their SFU clients would recognize.
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i) Finish inotify support so kde and gnome file list windows
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f) Finish inotify support so kde and gnome file list windows
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will autorefresh (partially complete by Asser). Needs minor kernel
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vfs change to support removing D_NOTIFY on a file.
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j) Add GUI tool to configure /proc/fs/cifs settings and for display of
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g) Add GUI tool to configure /proc/fs/cifs settings and for display of
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the CIFS statistics (started)
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k) implement support for security and trusted categories of xattrs
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h) implement support for security and trusted categories of xattrs
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(requires minor protocol extension) to enable better support for SELINUX
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l) Implement O_DIRECT flag on open (already supported on mount)
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i) Implement O_DIRECT flag on open (already supported on mount)
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m) Create UID mapping facility so server UIDs can be mapped on a per
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j) Create UID mapping facility so server UIDs can be mapped on a per
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mount or a per server basis to client UIDs or nobody if no mapping
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exists. This is helpful when Unix extensions are negotiated to
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allow better permission checking when UIDs differ on the server
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and client. Add new protocol request to the CIFS protocol
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standard for asking the server for the corresponding name of a
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particular uid.
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exists. Also better integration with winbind for resolving SID owners
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n) DOS attrs - returned as pseudo-xattr in Samba format (check VFAT and NTFS for this too)
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k) Add tools to take advantage of more smb3 specific ioctls and features
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o) mount check for unmatched uids
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l) encrypted file support
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p) Add support for new vfs entry point for fallocate
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m) improved stats gathering, tools (perhaps integration with nfsometer?)
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q) Add tools to take advantage of cifs/smb3 specific ioctls and features
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such as "CopyChunk" (fast server side file copy)
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n) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
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file attribute via chflags) and improve user space tools for managing and
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viewing them.
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r) encrypted file support
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o) mount helper GUI (to simplify the various configuration options on mount)
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s) improved stats gathering, tools (perhaps integration with nfsometer?)
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p) autonegotiation of dialects (offering more than one dialect ie SMB3.02,
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SMB3, SMB2.1 not just SMB3).
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t) allow setting more NTFS/SMB3 file attributes remotely (currently limited to compressed
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file attribute via chflags)
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q) Allow mount.cifs to be more verbose in reporting errors with dialect
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or unsupported feature errors.
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u) mount helper GUI (to simplify the various configuration options on mount)
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r) updating cifs documentation, and user guid.
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s) Addressing bugs found by running a broader set of xfstests in standard
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file system xfstest suite.
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t) split cifs and smb3 support into separate modules so legacy (and less
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secure) CIFS dialect can be disabled in environments that don't need it
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and simplify the code.
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u) Finish up SMB3.1.1 dialect support
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v) POSIX Extensions for SMB3.1.1
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KNOWN BUGS
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====================================
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@ -1,24 +1,28 @@
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This is the client VFS module for the Common Internet File System
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(CIFS) protocol which is the successor to the Server Message Block
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This is the client VFS module for the SMB3 NAS protocol as well
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older dialects such as the Common Internet File System (CIFS)
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protocol which was the successor to the Server Message Block
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(SMB) protocol, the native file sharing mechanism for most early
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PC operating systems. New and improved versions of CIFS are now
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called SMB2 and SMB3. These dialects are also supported by the
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CIFS VFS module. CIFS is fully supported by network
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file servers such as Windows 2000, 2003, 2008 and 2012
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file servers such as Windows 2000, 2003, 2008, 2012 and 2016
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as well by Samba (which provides excellent CIFS
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server support for Linux and many other operating systems), so
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server support for Linux and many other operating systems), Apple
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systems, as well as most Network Attached Storage vendors, so
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this network filesystem client can mount to a wide variety of
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servers.
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The intent of this module is to provide the most advanced network
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file system function for CIFS compliant servers, including better
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POSIX compliance, secure per-user session establishment, high
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performance safe distributed caching (oplock), optional packet
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file system function for SMB3 compliant servers, including advanced
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security features, excellent parallelized high performance i/o, better
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POSIX compliance, secure per-user session establishment, encryption,
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high performance safe distributed caching (leases/oplocks), optional packet
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signing, large files, Unicode support and other internationalization
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improvements. Since both Samba server and this filesystem client support
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the CIFS Unix extensions, the combination can provide a reasonable
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alternative to NFSv4 for fileserving in some Linux to Linux environments,
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not just in Linux to Windows environments.
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the CIFS Unix extensions (and in the future SMB3 POSIX extensions),
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the combination can provide a reasonable alternative to other network and
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cluster file systems for fileserving in some Linux to Linux environments,
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not just in Linux to Windows (or Linux to Mac) environments.
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This filesystem has an mount utility (mount.cifs) that can be obtained from
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