| 1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>mount.cifs</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="mount.cifs"><a name="mount.cifs.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>mount.cifs — mount using the Common Internet File System (CIFS)</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="literal">mount.cifs</code> {service} {mount-point} [-o options]</p></div></div><div class="refsect1" title="DESCRIPTION"><a name="id298700"></a><h2>DESCRIPTION</h2><p>This tool is part of the <a class="citerefentry" href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a> suite.</p><p>mount.cifs mounts a Linux CIFS filesystem. It
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| 2 | is usually invoked indirectly by
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| 3 | the <a class="citerefentry" href="mount.8.html"><span class="citerefentry"><span class="refentrytitle">mount</span>(8)</span></a> command when using the
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| 4 | "-t cifs" option. This command only works in Linux, and the kernel must
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| 5 | support the cifs filesystem. The CIFS protocol is the successor to the
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| 6 | SMB protocol and is supported by most Windows servers and many other
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| 7 | commercial servers and Network Attached Storage appliances as well as
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| 8 | by the popular Open Source server Samba.
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| 9 | </p><p>
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| 10 | The mount.cifs utility attaches the UNC name (exported network resource)
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| 11 | specified as <span class="emphasis"><em>service</em></span> (using //server/share syntax,
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| 12 | where "server" is the server name or IP address and "share" is the name
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| 13 | of the share) to the local directory <span class="emphasis"><em>mount-point</em></span>.
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| 14 | </p><p>
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| 15 | Options to <span class="emphasis"><em>mount.cifs</em></span> are specified as a comma-separated
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| 16 | list of key=value pairs. It is possible to send options other
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| 17 | than those listed here, assuming that the cifs filesystem kernel module (cifs.ko) supports them.
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| 18 | Unrecognized cifs mount options passed to the cifs vfs kernel code will be logged to the
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| 19 | kernel log.
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| 20 |
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| 21 | </p><p><span class="emphasis"><em>mount.cifs</em></span> causes the cifs vfs to launch a thread named cifsd. After mounting it keeps running until
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| 22 | the mounted resource is unmounted (usually via the umount utility).
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| 23 | </p><p>
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| 24 | <span class="emphasis"><em>mount.cifs -V</em></span> command displays the version of cifs mount helper.
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| 25 | </p><p>
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| 26 |
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| 27 | <span class="emphasis"><em>modinfo cifs</em></span> command displays the version of cifs module.
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| 28 | </p></div><div class="refsect1" title="OPTIONS"><a name="id298775"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">user=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>specifies the username to connect as. If
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| 29 | this is not given, then the environment variable <span class="emphasis"><em>USER</em></span> is used. This option can also take the
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| 30 | form "user%password" or "workgroup/user" or
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| 31 | "workgroup/user%password" to allow the password and workgroup
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| 32 | to be specified as part of the username.
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| 33 | </p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
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| 34 | The cifs vfs accepts the parameter <em class="parameter"><code>user=</code></em>, or for users familiar with smbfs it accepts the longer form of the parameter <em class="parameter"><code>username=</code></em>. Similarly the longer smbfs style parameter names may be accepted as synonyms for the shorter cifs parameters <em class="parameter"><code>pass=</code></em>,<em class="parameter"><code>dom=</code></em> and <em class="parameter"><code>cred=</code></em>.
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| 35 | </p></div></dd><dt><span class="term">password=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>specifies the CIFS password. If this
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| 36 | option is not given then the environment variable
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| 37 | <span class="emphasis"><em>PASSWD</em></span> is used. If the password is not specified
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| 38 | directly or indirectly via an argument to mount, <span class="emphasis"><em>mount.cifs</em></span> will prompt
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| 39 | for a password, unless the guest option is specified.
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| 40 | </p><p>Note that a password which contains the delimiter
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| 41 | character (i.e. a comma ',') will fail to be parsed correctly
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| 42 | on the command line. However, the same password defined
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| 43 | in the PASSWD environment variable or via a credentials file (see
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| 44 | below) or entered at the password prompt will be read correctly.
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| 45 | </p></dd><dt><span class="term">credentials=<em class="replaceable"><code>filename</code></em></span></dt><dd><p>
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| 46 | specifies a file that contains a username
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| 47 | and/or password and optionally the name of the
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| 48 | workgroup. The format of the file is:
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| 49 | </p><pre class="programlisting">
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| 50 | username=<em class="replaceable"><code>value</code></em>
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| 51 | password=<em class="replaceable"><code>value</code></em>
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| 52 | domain=<em class="replaceable"><code>value</code></em>
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| 53 | </pre><p>
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| 54 | This is preferred over having passwords in plaintext in a
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| 55 | shared file, such as <code class="filename">/etc/fstab</code>. Be sure to protect any
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| 56 | credentials file properly.
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| 57 | </p></dd><dt><span class="term">uid=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>sets the uid that will own all files or directories on the
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| 58 | mounted filesystem when the server does not provide ownership
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| 59 | information. It may be specified as either a username or a numeric uid.
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| 60 | When not specified, the default is uid 0. The mount.cifs helper must be
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| 61 | at version 1.10 or higher to support specifying the uid in non-numeric
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| 62 | form. See the section on FILE AND DIRECTORY OWNERSHIP AND PERMISSIONS below for more
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| 63 | information. </p></dd><dt><span class="term">prefixpath=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>
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| 64 | It's possible to mount a subdirectory of a share. The preferred way
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| 65 | to do this is to append the path to the UNC when mounting. However,
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| 66 | it's also possible to do the same by setting this option and
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| 67 | providing the path there.
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| 68 | </p></dd><dt><span class="term">cifsacl</span></dt><dd><p>
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| 69 | This option is used to map CIFS/NTFS ACLs to/from Linux permission
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| 70 | bits, map SIDs to/from UIDs and GIDs, and get and set Security
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| 71 | Descriptors.
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| 72 | </p></dd><dt><span class="term">forceuid</span></dt><dd><p>instructs the client to ignore any uid provided by
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| 73 | the server for files and directories and to always assign the owner to
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| 74 | be the value of the uid= option. See the section on FILE AND DIRECTORY OWNERSHIP AND PERMISSIONS below for more information.</p></dd><dt><span class="term">gid=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>sets the gid that will own all files or
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| 75 | directories on the mounted filesystem when the server does not provide
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| 76 | ownership information. It may be specified as either a groupname or a
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| 77 | numeric gid. When not specified, the default is gid 0. The mount.cifs
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| 78 | helper must be at version 1.10 or higher to support specifying the gid
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| 79 | in non-numeric form. See the section on FILE AND DIRECTORY OWNERSHIP AND
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| 80 | PERMISSIONS below for more information.</p></dd><dt><span class="term">forcegid</span></dt><dd><p>instructs the client to ignore any gid provided by
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| 81 | the server for files and directories and to always assign the owner to
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| 82 | be the value of the gid= option. See the section on FILE AND DIRECTORY OWNERSHIP AND PERMISSIONS below for more information.</p></dd><dt><span class="term">port=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>sets the port number on the server to attempt to contact to negotiate
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| 83 | CIFS support. If the CIFS server is not listening on this port or
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| 84 | if it is not specified, the default ports will be tried i.e.
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| 85 | port 445 is tried and if no response then port 139 is tried.
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| 86 | </p></dd><dt><span class="term">servernetbiosname=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>
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| 87 | Specify the server netbios name (RFC1001 name) to use
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| 88 | when attempting to setup a session to the server. Although
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| 89 | rarely needed for mounting to newer servers, this option
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| 90 | is needed for mounting to some older servers (such
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| 91 | as OS/2 or Windows 98 and Windows ME) since when connecting
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| 92 | over port 139 they, unlike most newer servers, do not
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| 93 | support a default server name. A server name can be up
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| 94 | to 15 characters long and is usually uppercased.
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| 95 | </p></dd><dt><span class="term">servern=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>synonym for <span class="emphasis"><em>servernetbiosname=</em></span></p></dd><dt><span class="term">netbiosname=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>When mounting to servers via port 139, specifies the RFC1001
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| 96 | source name to use to represent the client netbios machine
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| 97 | name when doing the RFC1001 netbios session initialize.
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| 98 | </p></dd><dt><span class="term">file_mode=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>If the server does not support the CIFS Unix extensions this
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| 99 | overrides the default file mode.</p></dd><dt><span class="term">dir_mode=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>If the server does not support the CIFS Unix extensions this
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| 100 | overrides the default mode for directories. </p></dd><dt><span class="term">ip=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>sets the destination IP address. This option is set automatically if the server name portion of the requested UNC name can be resolved so rarely needs to be specified by the user.</p></dd><dt><span class="term">domain=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>sets the domain (workgroup) of the user </p></dd><dt><span class="term">guest</span></dt><dd><p>don't prompt for a password </p></dd><dt><span class="term">iocharset</span></dt><dd><p>Charset used to convert local path names to and from
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| 101 | Unicode. Unicode is used by default for network path
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| 102 | names if the server supports it. If iocharset is
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| 103 | not specified then the nls_default specified
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| 104 | during the local client kernel build will be used.
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| 105 | If server does not support Unicode, this parameter is
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| 106 | unused. </p></dd><dt><span class="term">ro</span></dt><dd><p>mount read-only</p></dd><dt><span class="term">rw</span></dt><dd><p>mount read-write</p></dd><dt><span class="term">setuids</span></dt><dd><p>If the CIFS Unix extensions are negotiated with the server
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| 107 | the client will attempt to set the effective uid and gid of
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| 108 | the local process on newly created files, directories, and
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| 109 | devices (create, mkdir, mknod). If the CIFS Unix Extensions
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| 110 | are not negotiated, for newly created files and directories
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| 111 | instead of using the default uid and gid specified on the
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| 112 | the mount, cache the new file's uid and gid locally which means
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| 113 | that the uid for the file can change when the inode is
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| 114 | reloaded (or the user remounts the share).</p></dd><dt><span class="term">nosetuids</span></dt><dd><p>The client will not attempt to set the uid and gid on
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| 115 | on newly created files, directories, and devices (create,
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| 116 | mkdir, mknod) which will result in the server setting the
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| 117 | uid and gid to the default (usually the server uid of the
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| 118 | user who mounted the share). Letting the server (rather than
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| 119 | the client) set the uid and gid is the default.If the CIFS
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| 120 | Unix Extensions are not negotiated then the uid and gid for
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| 121 | new files will appear to be the uid (gid) of the mounter or the
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| 122 | uid (gid) parameter specified on the mount.</p></dd><dt><span class="term">perm</span></dt><dd><p>Client does permission checks (vfs_permission check of uid
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| 123 | and gid of the file against the mode and desired operation),
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| 124 | Note that this is in addition to the normal ACL check on the
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| 125 | target machine done by the server software.
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| 126 | Client permission checking is enabled by default.</p></dd><dt><span class="term">noperm</span></dt><dd><p>Client does not do permission checks. This can expose
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| 127 | files on this mount to access by other users on the local
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| 128 | client system. It is typically only needed when the server
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| 129 | supports the CIFS Unix Extensions but the UIDs/GIDs on the
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| 130 | client and server system do not match closely enough to allow
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| 131 | access by the user doing the mount.
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| 132 | Note that this does not affect the normal ACL check on the
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| 133 | target machine done by the server software (of the server
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| 134 | ACL against the user name provided at mount time).</p></dd><dt><span class="term">dynperm</span></dt><dd><p>Instructs the server to maintain ownership and
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| 135 | permissions in memory that can't be stored on the server. This information can disappear at any time (whenever the inode is flushed from the cache), so while this may help make some applications work, it's behavior is somewhat unreliable. See the section below on FILE AND DIRECTORY OWNERSHIP AND PERMISSIONS for more information.
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| 136 | </p></dd><dt><span class="term">directio</span></dt><dd><p>Do not do inode data caching on files opened on this mount.
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| 137 | This precludes mmaping files on this mount. In some cases
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| 138 | with fast networks and little or no caching benefits on the
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| 139 | client (e.g. when the application is doing large sequential
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| 140 | reads bigger than page size without rereading the same data)
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| 141 | this can provide better performance than the default
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| 142 | behavior which caches reads (readahead) and writes
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| 143 | (writebehind) through the local Linux client pagecache
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| 144 | if oplock (caching token) is granted and held. Note that
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| 145 | direct allows write operations larger than page size
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| 146 | to be sent to the server. On some kernels this requires the cifs.ko module
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| 147 | to be built with the CIFS_EXPERIMENTAL configure option.</p></dd><dt><span class="term">mapchars</span></dt><dd><p>Translate six of the seven reserved characters (not backslash, but including the colon, question mark, pipe, asterik, greater than and less than characters)
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| 148 | to the remap range (above 0xF000), which also
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| 149 | allows the CIFS client to recognize files created with
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| 150 | such characters by Windows's POSIX emulation. This can
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| 151 | also be useful when mounting to most versions of Samba
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| 152 | (which also forbids creating and opening files
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| 153 | whose names contain any of these seven characters).
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| 154 | This has no effect if the server does not support
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| 155 | Unicode on the wire. Please note that the files created
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| 156 | with mapchars mount option may not be accessible
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| 157 | if the share is mounted without that option.</p></dd><dt><span class="term">nomapchars</span></dt><dd><p>Do not translate any of these seven characters (default)</p></dd><dt><span class="term">intr</span></dt><dd><p>currently unimplemented</p></dd><dt><span class="term">nointr</span></dt><dd><p>(default) currently unimplemented </p></dd><dt><span class="term">hard</span></dt><dd><p>The program accessing a file on the cifs mounted file system will hang when the
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| 158 | server crashes.</p></dd><dt><span class="term">soft</span></dt><dd><p>(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.</p></dd><dt><span class="term">noacl</span></dt><dd><p>Do not allow POSIX ACL operations even if server would support them.</p><p>
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| 159 | The CIFS client can get and set POSIX ACLs (getfacl, setfacl) to Samba servers
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| 160 | version 3.0.10 and later. Setting POSIX ACLs requires enabling both XATTR and
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| 161 | then POSIX support in the CIFS configuration options when building the cifs
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| 162 | module. POSIX ACL support can be disabled on a per mount basis by specifying
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| 163 | "noacl" on mount.</p></dd><dt><span class="term">nocase</span></dt><dd><p>Request case insensitive path name matching (case
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| 164 | sensitive is the default if the server suports it).
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| 165 | </p></dd><dt><span class="term">ignorecase</span></dt><dd><p>
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| 166 | Synonym for <span class="emphasis"><em>nocase</em></span>
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| 167 | </p></dd><dt><span class="term">sec=</span></dt><dd><p>Security mode. Allowed values are:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>none attempt to connection as a null user (no name) </p></li><li class="listitem"><p>krb5 Use Kerberos version 5 authentication</p></li><li class="listitem"><p>krb5i Use Kerberos authentication and packet signing</p></li><li class="listitem"><p>ntlm Use NTLM password hashing (default)</p></li><li class="listitem"><p>ntlmi Use NTLM password hashing with signing (if
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| 168 | /proc/fs/cifs/PacketSigningEnabled on or if
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| 169 | server requires signing also can be the default)</p></li><li class="listitem"><p>ntlmv2 Use NTLMv2 password hashing</p></li><li class="listitem"><p>ntlmv2i Use NTLMv2 password hashing with packet signing</p></li></ul></div><p>[NB This [sec parameter] is under development and expected to be available in cifs kernel module 1.40 and later]
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| 170 | </p></dd><dt><span class="term">nobrl</span></dt><dd><p>Do not send byte range lock requests to the server.
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| 171 | This is necessary for certain applications that break
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| 172 | with cifs style mandatory byte range locks (and most
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| 173 | cifs servers do not yet support requesting advisory
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| 174 | byte range locks).
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| 175 | </p></dd><dt><span class="term">sfu</span></dt><dd><p>
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| 176 | When the CIFS Unix Extensions are not negotiated, attempt to
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| 177 | create device files and fifos in a format compatible with
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| 178 | Services for Unix (SFU). In addition retrieve bits 10-12
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| 179 | of the mode via the SETFILEBITS extended attribute (as
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| 180 | SFU does). In the future the bottom 9 bits of the mode
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| 181 | mode also will be emulated using queries of the security
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| 182 | descriptor (ACL). [NB: requires version 1.39 or later
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| 183 | of the CIFS VFS. To recognize symlinks and be able
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| 184 | to create symlinks in an SFU interoperable form
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| 185 | requires version 1.40 or later of the CIFS VFS kernel module.
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| 186 | </p></dd><dt><span class="term">serverino</span></dt><dd><p>Use inode numbers (unique persistent file identifiers)
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| 187 | returned by the server instead of automatically generating
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| 188 | temporary inode numbers on the client. Although server inode numbers
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| 189 | make it easier to spot hardlinked files (as they will have
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| 190 | the same inode numbers) and inode numbers may be persistent (which is
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| 191 | userful for some sofware),
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| 192 | the server does not guarantee that the inode numbers
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| 193 | are unique if multiple server side mounts are exported under a
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| 194 | single share (since inode numbers on the servers might not
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| 195 | be unique if multiple filesystems are mounted under the same
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| 196 | shared higher level directory). Note that not all
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| 197 | servers support returning server inode numbers, although
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| 198 | those that support the CIFS Unix Extensions, and Windows 2000 and
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| 199 | later servers typically do support this (although not necessarily
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| 200 | on every local server filesystem). Parameter has no effect if
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| 201 | the server lacks support for returning inode numbers or equivalent.
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| 202 | </p></dd><dt><span class="term">noserverino</span></dt><dd><p>
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| 203 | Client generates inode numbers (rather than
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| 204 | using the actual one from the server) by default.
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| 205 | </p><p>
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| 206 | See section <span class="emphasis"><em>INODE NUMBERS</em></span> for
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| 207 | more information.
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| 208 | </p></dd><dt><span class="term">nounix</span></dt><dd><p>
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| 209 | Disable the CIFS Unix Extensions for this mount. This
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| 210 | can be useful in order to turn off multiple settings at once.
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| 211 | This includes POSIX acls, POSIX locks, POSIX paths, symlink
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| 212 | support and retrieving uids/gids/mode from the server. This
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| 213 | can also be useful to work around a bug in a server that
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| 214 | supports Unix Extensions.
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| 215 | </p><p>
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| 216 | See section <span class="emphasis"><em>INODE NUMBERS</em></span> for
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| 217 | more information.
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| 218 | </p></dd><dt><span class="term">nouser_xattr</span></dt><dd><p>(default) Do not allow getfattr/setfattr to get/set xattrs, even if server would support it otherwise. </p></dd><dt><span class="term">rsize=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>default network read size (usually 16K). The client currently
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| 219 | can not use rsize larger than CIFSMaxBufSize. CIFSMaxBufSize
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| 220 | defaults to 16K and may be changed (from 8K to the maximum
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| 221 | kmalloc size allowed by your kernel) at module install time
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| 222 | for cifs.ko. Setting CIFSMaxBufSize to a very large value
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| 223 | will cause cifs to use more memory and may reduce performance
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| 224 | in some cases. To use rsize greater than 127K (the original
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| 225 | cifs protocol maximum) also requires that the server support
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| 226 | a new Unix Capability flag (for very large read) which some
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| 227 | newer servers (e.g. Samba 3.0.26 or later) do. rsize can be
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| 228 | set from a minimum of 2048 to a maximum of 130048 (127K or
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| 229 | CIFSMaxBufSize, whichever is smaller)
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| 230 |
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| 231 | </p></dd><dt><span class="term">wsize=<em class="replaceable"><code>arg</code></em></span></dt><dd><p>default network write size (default 57344)
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| 232 | maximum wsize currently allowed by CIFS is 57344 (fourteen
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| 233 | 4096 byte pages)</p></dd><dt><span class="term">noposixpaths</span></dt><dd><p>
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| 234 | If unix extensions are enabled on a share, then the client will
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| 235 | typically allow filenames to include any character besides '/' in a
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| 236 | pathname component, and will use forward slashes as a pathname
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| 237 | delimiter. This option prevents the client from attempting to
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| 238 | negotiate the use of posix-style pathnames to the server.
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| 239 | </p></dd><dt><span class="term">posixpaths</span></dt><dd><p>
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| 240 | Inverse of <span class="emphasis"><em>noposixpaths</em></span>
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| 241 | </p></dd><dt><span class="term">--verbose</span></dt><dd><p>Print additional debugging information for the mount. Note that this parameter must be specified before the -o. For example:</p><p>mount -t cifs //server/share /mnt --verbose -o user=username</p></dd></dl></div></div><div class="refsect1" title="SERVICE FORMATTING AND DELIMITERS"><a name="id308149"></a><h2>SERVICE FORMATTING AND DELIMITERS</h2><p>
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| 242 | It's generally preferred to use forward slashes (/) as a delimiter in service names. They are considered to be the "universal delimiter" since they are generally not allowed to be embedded within path components on Windows machines and the client can convert them to blackslashes (\) unconditionally. Conversely, backslash characters are allowed by POSIX to be part of a path component, and can't be automatically converted in the same way.
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| 243 | </p><p>
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| 244 | mount.cifs will attempt to convert backslashes to forward slashes where it's able to do so, but it cannot do so in any path component following the sharename.
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| 245 | </p></div><div class="refsect1" title="INODE NUMBERS"><a name="id308167"></a><h2>INODE NUMBERS</h2><p>
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| 246 | When Unix Extensions are enabled, we use the actual inode
|
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| 247 | number provided by the server in response to the POSIX calls as an
|
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| 248 | inode number.
|
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| 249 | </p><p>
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| 250 | When Unix Extensions are disabled and "serverino" mount option
|
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| 251 | is enabled there is no way to get the server inode number. The
|
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| 252 | client typically maps the server-assigned "UniqueID" onto an inode
|
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| 253 | number.
|
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| 254 | </p><p>
|
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| 255 | Note that the UniqueID is a different value from the server
|
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| 256 | inode number. The UniqueID value is unique over the scope of the entire
|
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| 257 | server and is often greater than 2 power 32. This value often makes
|
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| 258 | programs that are not compiled with LFS (Large File Support), to
|
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| 259 | trigger a glibc EOVERFLOW error as this won't fit in the target
|
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| 260 | structure field. It is strongly recommended to compile your programs
|
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| 261 | with LFS support (i.e. with -D_FILE_OFFSET_BITS=64) to prevent this
|
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| 262 | problem. You can also use "noserverino" mount option to generate inode
|
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| 263 | numbers smaller than 2 power 32 on the client. But you may not be able
|
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| 264 | to detect hardlinks properly.
|
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| 265 | </p></div><div class="refsect1" title="FILE AND DIRECTORY OWNERSHIP AND PERMISSIONS"><a name="id308192"></a><h2>FILE AND DIRECTORY OWNERSHIP AND PERMISSIONS</h2><p> The core CIFS protocol does not provide unix ownership
|
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| 266 | information or mode for files and directories. Because of this, files
|
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| 267 | and directories will generally appear to be owned by whatever values the
|
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| 268 | uid= or gid= options are set, and will have permissions set to the
|
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| 269 | default file_mode and dir_mode for the mount. Attempting to change these
|
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| 270 | values via chmod/chown will return success but have no effect.</p><p>When the client and server negotiate unix extensions,
|
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| 271 | files and directories will be assigned the uid, gid, and mode provided
|
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| 272 | by the server. Because CIFS mounts are generally single-user, and the
|
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| 273 | same credentials are used no matter what user accesses the mount, newly
|
|---|
| 274 | created files and directories will generally be given ownership
|
|---|
| 275 | corresponding to whatever credentials were used to mount the
|
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| 276 | share.</p><p>If the uid's and gid's being used do not match on the
|
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| 277 | client and server, the forceuid and forcegid options may be helpful.
|
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| 278 | Note however, that there is no corresponding option to override the
|
|---|
| 279 | mode. Permissions assigned to a file when forceuid or forcegid are in
|
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| 280 | effect may not reflect the the real permissions.</p><p>When unix extensions are not negotiated, it's also
|
|---|
| 281 | possible to emulate them locally on the server using the "dynperm" mount
|
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| 282 | option. When this mount option is in effect, newly created files and
|
|---|
| 283 | directories will receive what appear to be proper permissions. These
|
|---|
| 284 | permissions are not stored on the server however and can disappear at
|
|---|
| 285 | any time in the future (subject to the whims of the kernel flushing out
|
|---|
| 286 | the inode cache). In general, this mount option is discouraged.
|
|---|
| 287 | </p><p>It's also possible to override permission checking on the client
|
|---|
| 288 | altogether via the noperm option. Server-side permission checks cannot be
|
|---|
| 289 | overriden. The permission checks done by the server will always correspond to
|
|---|
| 290 | the credentials used to mount the share, and not necessarily to the user who is accessing the share.</p></div><div class="refsect1" title="ENVIRONMENT VARIABLES"><a name="id308234"></a><h2>ENVIRONMENT VARIABLES</h2><p>
|
|---|
| 291 | The variable <span class="emphasis"><em>USER</em></span> may contain the username of the
|
|---|
| 292 | person to be used to authenticate to the server.
|
|---|
| 293 | The variable can be used to set both username and
|
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| 294 | password by using the format username%password.
|
|---|
| 295 | </p><p>
|
|---|
| 296 | The variable <span class="emphasis"><em>PASSWD</em></span> may contain the password of the
|
|---|
| 297 | person using the client.
|
|---|
| 298 | </p><p>
|
|---|
| 299 | The variable <span class="emphasis"><em>PASSWD_FILE</em></span> may contain the pathname
|
|---|
| 300 | of a file to read the password from. A single line of input is
|
|---|
| 301 | read and used as the password.
|
|---|
| 302 | </p></div><div class="refsect1" title="NOTES"><a name="id308262"></a><h2>NOTES</h2><p>This command may be used only by root, unless installed setuid, in which case the noeexec and nosuid mount flags are enabled. When installed as a setuid program, the program follows the conventions set forth by the mount program for user mounts.</p><p>
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| 303 | Some samba client tools like smbclient(8) honour client-side
|
|---|
| 304 | configuration parameters present in smb.conf. Unlike those
|
|---|
| 305 | client tools, <span class="emphasis"><em>mount.cifs</em></span> ignores smb.conf
|
|---|
| 306 | completely.
|
|---|
| 307 | </p></div><div class="refsect1" title="CONFIGURATION"><a name="id308282"></a><h2>CONFIGURATION</h2><p>
|
|---|
| 308 | The primary mechanism for making configuration changes and for reading
|
|---|
| 309 | debug information for the cifs vfs is via the Linux /proc filesystem.
|
|---|
| 310 | In the directory <code class="filename">/proc/fs/cifs</code> are various
|
|---|
| 311 | configuration files and pseudo files which can display debug information.
|
|---|
| 312 | There are additional startup options such as maximum buffer size and number
|
|---|
| 313 | of buffers which only may be set when the kernel cifs vfs (cifs.ko module) is
|
|---|
| 314 | loaded. These can be seen by running the modinfo utility against the file
|
|---|
| 315 | cifs.ko which will list the options that may be passed to cifs during module
|
|---|
| 316 | installation (device driver load).
|
|---|
| 317 | For more information see the kernel file <code class="filename">fs/cifs/README</code>.
|
|---|
| 318 | </p></div><div class="refsect1" title="BUGS"><a name="id308308"></a><h2>BUGS</h2><p>Mounting using the CIFS URL specification is currently not supported.
|
|---|
| 319 | </p><p>The credentials file does not handle usernames or passwords with
|
|---|
| 320 | leading space.</p><p>
|
|---|
| 321 | Note that the typical response to a bug report is a suggestion
|
|---|
| 322 | to try the latest version first. So please try doing that first,
|
|---|
| 323 | and always include which versions you use of relevant software
|
|---|
| 324 | when reporting bugs (minimum: mount.cifs (try mount.cifs -V), kernel (see /proc/version) and
|
|---|
| 325 | server type you are trying to contact.
|
|---|
| 326 | </p></div><div class="refsect1" title="VERSION"><a name="id308327"></a><h2>VERSION</h2><p>This man page is correct for version 1.52 of
|
|---|
| 327 | the cifs vfs filesystem (roughly Linux kernel 2.6.24).</p></div><div class="refsect1" title="SEE ALSO"><a name="id308338"></a><h2>SEE ALSO</h2><p>
|
|---|
| 328 | Documentation/filesystems/cifs.txt and fs/cifs/README in the linux kernel
|
|---|
| 329 | source tree may contain additional options and information.
|
|---|
| 330 | </p><p><a class="citerefentry" href="umount.cifs.8.html"><span class="citerefentry"><span class="refentrytitle">umount.cifs</span>(8)</span></a></p></div><div class="refsect1" title="AUTHOR"><a name="id308357"></a><h2>AUTHOR</h2><p>Steve French</p><p>The syntax and manpage were loosely based on that of smbmount. It
|
|---|
| 331 | was converted to Docbook/XML by Jelmer Vernooij.</p><p>The maintainer of the Linux cifs vfs and the userspace
|
|---|
| 332 | tool <span class="emphasis"><em>mount.cifs</em></span> is <a class="ulink" href="mailto:sfrench@samba.org" target="_top">Steve French</a>.
|
|---|
| 333 | The <a class="ulink" href="mailto:linux-cifs-client@lists.samba.org" target="_top">Linux CIFS Mailing list</a>
|
|---|
| 334 | is the preferred place to ask questions regarding these programs.
|
|---|
| 335 | </p></div></div></body></html>
|
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