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authorJelmer Vernooij <jelmer@samba.org>2005-05-02 08:28:41 +0000
committerGerald W. Carter <jerry@samba.org>2008-04-23 08:46:32 -0500
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+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
+<refentry id="mount.cifs.8">
+
+<refmeta>
+ <refentrytitle>mount.cifs</refentrytitle>
+ <manvolnum>8</manvolnum>
+</refmeta>
+
+
+<refnamediv>
+ <refname>mount.cifs</refname>
+ <refpurpose>mount using the Common Internet File System (CIFS)</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+ <cmdsynopsis>
+
+ <command>mount.cifs</command>
+ <arg choice="req">service</arg>
+ <arg choice="req">mount-point</arg>
+ <arg choice="opt">-o options</arg>
+ </cmdsynopsis>
+</refsynopsisdiv>
+
+<refsect1>
+ <title>DESCRIPTION</title>
+
+ <para>This tool is part of the <citerefentry><refentrytitle>samba</refentrytitle>
+ <manvolnum>7</manvolnum></citerefentry> suite.</para>
+
+ <para>mount.cifs mounts a Linux CIFS filesystem. It
+is usually invoked indirectly by
+the <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry> command when using the
+"-t cifs" option. This command only works in Linux, and the kernel must
+support the cifs filesystem. The CIFS protocol is the successor to the
+SMB protocol and is supported by most Windows servers and many other
+commercial servers and Network Attached Storage appliances as well as
+by the popular Open Source server Samba.
+ </para>
+
+ <para>
+ The mount.cifs utility attaches the UNC name (exported network resource) to
+ the local directory <emphasis>mount-point</emphasis>. It is possible to set the mode for mount.cifs to
+setuid root to allow non-root users to mount shares to directories for which they
+have write permission.
+ </para>
+
+ <para>
+ Options to <emphasis>mount.cifs</emphasis> are specified as a comma-separated
+list of key=value pairs. It is possible to send options other
+than those listed here, assuming that the cifs filesystem kernel module (cifs.ko) supports them.
+Unrecognized cifs mount options passed to the cifs vfs kernel code will be logged to the
+kernel log.
+
+ </para>
+
+ <para><emphasis>mount.cifs</emphasis> causes the cifs vfs to launch a thread named cifsd. After mounting it keeps running until
+ the mounted resource is unmounted (usually via the umount utility).
+ </para>
+
+</refsect1>
+
+<refsect1>
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry><term>user=<replaceable>arg</replaceable></term>
+
+ <listitem><para>specifies the username to connect as. If
+ this is not given, then the environment variable <emphasis>USER</emphasis> is used. This option can also take the
+form "user%password" or "workgroup/user" or
+"workgroup/user%password" to allow the password and workgroup
+to be specified as part of the username.
+ </para>
+
+<note>
+ <para>
+ The cifs vfs accepts the parameter <parameter>user=</parameter>, or for users familiar with smbfs it accepts the longer form of the parameter <parameter>username=</parameter>. Similarly the longer smbfs style parameter names may be accepted as synonyms for the shorter cifs parameters <parameter>pass=</parameter>,<parameter>dom=</parameter> and <parameter>cred=</parameter>.
+ </para>
+</note>
+
+ </listitem>
+ </varlistentry>
+
+ <varlistentry><term>password=<replaceable>arg</replaceable></term>
+
+ <listitem><para>specifies the CIFS password. If this
+option is not given then the environment variable
+<emphasis>PASSWD</emphasis> is used. If the password is not specified
+directly or indirectly via an argument to mount <emphasis>mount.cifs</emphasis> will prompt
+for a password, unless the guest option is specified.
+</para>
+
+<para>Note that a password which contains the delimiter
+character (i.e. a comma ',') will fail to be parsed correctly
+on the command line. However, the same password defined
+in the PASSWD environment variable or via a credentials file (see
+below) or entered at the password prompt will be read correctly.
+</para>
+ </listitem></varlistentry>
+
+ <varlistentry><term>credentials=<replaceable>filename</replaceable></term>
+
+ <listitem><para>
+ specifies a file that contains a username
+ and/or password. The format of the file is:
+ </para>
+
+<programlisting>
+ username=<replaceable>value</replaceable>
+ password=<replaceable>value</replaceable>
+</programlisting>
+
+ <para>
+This is preferred over having passwords in plaintext in a
+shared file, such as <filename>/etc/fstab</filename>. Be sure to protect any
+credentials file properly.
+ </para>
+ </listitem></varlistentry>
+
+ <varlistentry>
+ <term>uid=<replaceable>arg</replaceable></term>
+
+ <listitem><para>sets the uid that will own all files on
+ the mounted filesystem.
+ It may be specified as either a username or a numeric uid.
+ This parameter is ignored when the target server supports
+ the CIFS Unix extensions.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>gid=<replaceable>arg</replaceable></term>
+
+ <listitem><para>sets the gid that will own all files on
+the mounted filesystem.
+It may be specified as either a groupname or a numeric
+gid. This parameter is ignored when the target server supports
+the CIFS Unix extensions.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>port=<replaceable>arg</replaceable></term>
+
+ <listitem><para>sets the port number on the server to attempt to contact to negotiate
+CIFS support. If the CIFS server is not listening on this port or
+if it is not specified, the default ports will be tried i.e.
+port 445 is tried and if no response then port 139 is tried.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>netbiosname=<replaceable>arg</replaceable></term>
+
+ <listitem><para>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.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>file_mode=<replaceable>arg</replaceable></term>
+
+ <listitem><para>If the server does not support the CIFS Unix extensions this
+ overrides the default file mode.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>dir_mode=<replaceable>arg</replaceable></term>
+
+ <listitem><para>If the server does not support the CIFS Unix extensions this
+ overrides the default mode for directories. </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>ip=<replaceable>arg</replaceable></term>
+
+ <listitem><para>sets the destination host or IP address.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>domain=<replaceable>arg</replaceable></term>
+
+ <listitem><para>sets the domain (workgroup) of the user </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>guest</term>
+
+ <listitem><para>don't prompt for a password </para></listitem>
+
+ </varlistentry>
+
+ <varlistentry>
+ <term>iocharset</term>
+
+ <listitem><para>Charset 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. </para></listitem>
+
+ </varlistentry>
+
+ <varlistentry>
+ <term>ro</term>
+
+ <listitem><para>mount read-only</para></listitem>
+
+ </varlistentry>
+
+ <varlistentry>
+ <term>rw</term>
+ <listitem><para>mount read-write</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>setuids</term>
+ <listitem><para>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).</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>nosetuids</term>
+ <listitem><para>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
+ the client) set the uid and gid is the default. This
+ parameter has no effect if the CIFS Unix Extensions are not
+ negotiated.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>perm</term>
+ <listitem><para>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.
+ Client permission checking is enabled by default.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>noperm</term>
+ <listitem><para>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
+ client and server system do not match closely enough to allow
+ access by the user doing the mount.
+ 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).</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>directio</term>
+ <listitem><para>Do not do inode data caching on files opened on this mount.
+ This precludes mmaping 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)
+ this can provide better performance than the default
+ 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. On some kernels this requires the cifs.ko module
+ to be built with the CIFS_EXPERIMENTAL configure option.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>mapchars</term>
+ <listitem><para>Translate six of the seven reserved characters (not backslash, but including the colon, question mark, pipe, asterik, greater than and less than characters)
+ 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
+ also be useful when mounting to most versions of Samba
+ (which also forbids creating and opening files
+ whose names contain any of these seven characters).
+ This has no effect if the server does not support
+ Unicode on the wire.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>nomapchars</term>
+ <listitem><para>Do not translate any of these seven characters (default)</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>intr</term>
+ <listitem><para>currently unimplemented</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>nointr</term>
+ <listitem><para>(default) currently unimplemented </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>hard</term>
+ <listitem><para>The program accessing a file on the cifs mounted file system will hang when the
+ server crashes.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>soft</term>
+ <listitem><para>(default) The program accessing a file on the cifs mounted file system will not hang when the server crashes and will return errors to the user application.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>--verbose</term>
+ <listitem><para>Print additional debugging information for the mount. Note that this parameter must be specified before the -o. For example:</para><para>mount -t cifs //server/share /mnt --verbose -o user=username</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>noacl</term>
+ <listitem><para>Do not allow POSIX ACL operations even if server would support them.</para><para>
+ 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
+ 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.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>serverino</term>
+ <listitem><para>Use inode numbers (unique persistent file identifiers)
+ returned by the server instead of automatically generating
+ temporary inode numbers on the client. Although server inode numbers
+ make it easier to spot hardlinked files (as they will have
+ the same inode numbers) and inode numbers may be persistent (which is
+ userful for some sofware),
+ the server does not guarantee that the inode numbers
+ are unique if multiple server side mounts are exported under a
+ single share (since inode numbers on the servers might not
+ be unique if multiple filesystems are mounted under the same
+ shared higher level directory). Note that not all
+ servers support returning server inode numbers, although
+ those that support the CIFS Unix Extensions, and Windows 2000 and
+ later servers typically do support this (although not necessarily
+ on every local server filesystem). Parameter has no effect if
+ the server lacks support for returning inode numbers or equivalent.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>noserverino</term>
+ <listitem><para>client generates inode numbers (rather than using the actual one
+ from the server) by default.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>nouser_xattr</term>
+ <listitem><para>(default) Do not allow getfattr/setfattr to get/set xattrs, even if server would support it otherwise. </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>rsize=<replaceable>arg</replaceable></term>
+ <listitem><para>default network read size</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>wsize=<replaceable>arg</replaceable></term>
+
+ <listitem><para>default network write size</para></listitem>
+ </varlistentry>
+
+ </variablelist>
+</refsect1>
+
+<refsect1>
+ <title>ENVIRONMENT VARIABLES</title>
+
+ <para>
+ The variable <emphasis>USER</emphasis> may contain the username of the
+person to be used to authenticate to the server.
+The variable can be used to set both username and
+password by using the format username%password.
+ </para>
+
+ <para>
+ The variable <emphasis>PASSWD</emphasis> may contain the password of the
+person using the client.
+ </para>
+
+ <para>
+ The variable <emphasis>PASSWD_FILE</emphasis> may contain the pathname
+of a file to read the password from. A single line of input is
+read and used as the password.
+ </para>
+
+</refsect1>
+
+<refsect1>
+ <title>NOTES</title>
+
+ <para>This command may be used only by root, unless installed setuid, in which case the noeexec and nosuid mount flags are enabled.</para>
+</refsect1>
+
+<refsect1>
+ <title>CONFIGURATION</title>
+ <para>
+The primary mechanism for making configuration changes and for reading
+debug information for the cifs vfs is via the Linux /proc filesystem.
+In the directory <filename>/proc/fs/cifs</filename> are various
+configuration files and pseudo files which can display debug information.
+For more information see the kernel file <filename>fs/cifs/README</filename>.
+</para>
+</refsect1>
+
+<refsect1>
+ <title>BUGS</title>
+
+ <para>Mounting using the CIFS URL specification is currently not supported.
+ </para>
+
+ <para>The credentials file does not handle usernames or passwords with
+ leading space.</para>
+
+ <para>
+Note that the typical response to a bug report is a suggestion
+to try the latest version first. So please try doing that first,
+and always include which versions you use of relevant software
+when reporting bugs (minimum: mount.cifs (try mount.cifs -V), kernel (see /proc/version) and
+server type you are trying to contact.
+</para>
+</refsect1>
+
+
+
+<refsect1>
+ <title>VERSION</title>
+
+ <para>This man page is correct for version 1.34 of
+ the cifs vfs filesystem (roughly Linux kernel 2.6.12).</para>
+</refsect1>
+
+<refsect1>
+ <title>SEE ALSO</title>
+ <para>
+ Documentation/filesystems/cifs.txt and fs/cifs/README in the linux kernel
+ source tree may contain additional options and information.
+</para>
+ <para><citerefentry><refentrytitle>umount.cifs</refentrytitle>
+ <manvolnum>8</manvolnum></citerefentry></para>
+
+</refsect1>
+
+<refsect1>
+ <title>AUTHOR</title>
+
+ <para>Steve French</para>
+
+ <para>The syntax and manpage were loosely based on that of smbmount. It
+ was converted to Docbook/XML by Jelmer Vernooij.</para>
+
+ <para>The maintainer of the Linux cifs vfs and the userspace
+ tool <emphasis>mount.cifs</emphasis> is <ulink url="mailto:sfrench@samba.org">Steve French</ulink>.
+ The <ulink url="mailto:linux-cifs-client@lists.samba.org">Linux CIFS Mailing list</ulink>
+ is the preferred place to ask questions regarding these programs.
+ </para>
+
+</refsect1>
+
+</refentry>