2 tristate "CIFS support (advanced network filesystem, SMBFS successor)"
11 This is the client VFS module for the Common Internet File System
12 (CIFS) protocol which is the successor to the Server Message Block
13 (SMB) protocol, the native file sharing mechanism for most early
14 PC operating systems. The CIFS protocol is fully supported by
15 file servers such as Windows 2000 (including Windows 2003, NT 4
16 and Windows XP) as well by Samba (which provides excellent CIFS
17 server support for Linux and many other operating systems). Limited
18 support for OS/2 and Windows ME and similar servers is provided as
21 The cifs module provides an advanced network file system
22 client for mounting to CIFS compliant servers. It includes
23 support for DFS (hierarchical name space), secure per-user
24 session establishment via Kerberos or NTLM or NTLMv2,
25 safe distributed caching (oplock), optional packet
26 signing, Unicode and other internationalization improvements.
27 If you need to mount to Samba or Windows from this machine, say Y.
30 bool "CIFS statistics"
33 Enabling this option will cause statistics for each server share
34 mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
37 bool "Extended statistics"
40 Enabling this option will allow more detailed statistics on SMB
41 request timing to be displayed in /proc/fs/cifs/DebugData and also
42 allow optional logging of slow responses to dmesg (depending on the
43 value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
44 These additional statistics may have a minor effect on performance
45 and memory utilization.
47 Unless you are a developer or are doing network performance analysis
50 config CIFS_WEAK_PW_HASH
51 bool "Support legacy servers which use weaker LANMAN security"
54 Modern CIFS servers including Samba and most Windows versions
55 (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
56 security mechanisms. These hash the password more securely
57 than the mechanisms used in the older LANMAN version of the
58 SMB protocol but LANMAN based authentication is needed to
59 establish sessions with some old SMB servers.
61 Enabling this option allows the cifs module to mount to older
62 LANMAN based servers such as OS/2 and Windows 95, but such
63 mounts may be less secure than mounts using NTLM or more recent
64 security mechanisms if you are on a public network. Unless you
65 have a need to access old SMB servers (and are on a private
66 network) you probably want to say N. Even if this support
67 is enabled in the kernel build, LANMAN authentication will not be
68 used automatically. At runtime LANMAN mounts are disabled but
69 can be set to required (or optional) either in
70 /proc/fs/cifs (see fs/cifs/README for more detail) or via an
71 option on the mount command. This support is disabled by
72 default in order to reduce the possibility of a downgrade
78 bool "Kerberos/SPNEGO advanced session setup"
79 depends on CIFS && KEYS
82 Enables an upcall mechanism for CIFS which accesses userspace helper
83 utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
84 which are needed to mount to certain secure servers (for which more
85 secure Kerberos authentication is required). If unsure, say N.
88 bool "CIFS extended attributes"
91 Extended attributes are name:value pairs associated with inodes by
92 the kernel or by users (see the attr(5) manual page, or visit
93 <http://acl.bestbits.at/> for details). CIFS maps the name of
94 extended attributes beginning with the user namespace prefix
95 to SMB/CIFS EAs. EAs are stored on Windows servers without the
96 user namespace prefix, but their names are seen by Linux cifs clients
97 prefaced by the user namespace prefix. The system namespace
98 (used by some filesystems to store ACLs) is not supported at
104 bool "CIFS POSIX Extensions"
105 depends on CIFS_XATTR
107 Enabling this option will cause the cifs client to attempt to
108 negotiate a newer dialect with servers, such as Samba 3.0.5
109 or later, that optionally can handle more POSIX like (rather
110 than Windows like) file behavior. It also enables
111 support for POSIX ACLs (getfacl and setfacl) to servers
112 (such as Samba 3.10 and later) which can negotiate
113 CIFS POSIX ACL support. If unsure, say N.
116 bool "Enable additional CIFS debugging routines"
119 Enabling this option adds a few more debugging routines
120 to the cifs code which slightly increases the size of
121 the cifs module and can cause additional logging of debug
122 messages in some error paths, slowing performance. This
123 option can be turned off unless you are debugging
124 cifs problems. If unsure, say N.
126 config CIFS_DFS_UPCALL
127 bool "DFS feature support"
128 depends on CIFS && KEYS
131 Distributed File System (DFS) support is used to access shares
132 transparently in an enterprise name space, even if the share
133 moves to a different server. This feature also enables
134 an upcall mechanism for CIFS which contacts userspace helper
135 utilities to provide server name resolution (host names to
136 IP addresses) which is needed for implicit mounts of DFS junction
137 points. If unsure, say N.
140 bool "Provide CIFS client caching support (EXPERIMENTAL)"
141 depends on EXPERIMENTAL
142 depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
144 Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
145 to be cached locally on disk through the general filesystem cache
146 manager. If unsure, say N.
149 bool "Provide CIFS ACL support (EXPERIMENTAL)"
150 depends on EXPERIMENTAL && CIFS_XATTR
152 Allows to fetch CIFS/NTFS ACL from the server. The DACL blob
153 is handed over to the application/caller.
155 config CIFS_EXPERIMENTAL
156 bool "CIFS Experimental Features (EXPERIMENTAL)"
157 depends on CIFS && EXPERIMENTAL
159 Enables cifs features under testing. These features are
160 experimental and currently include DFS support and directory
161 change notification ie fcntl(F_DNOTIFY), as well as the upcall
162 mechanism which will be used for Kerberos session negotiation
163 and uid remapping. Some of these features also may depend on
164 setting a value of 1 to the pseudo-file /proc/fs/cifs/Experimental
165 (which is disabled by default). See the file fs/cifs/README
166 for more details. If unsure, say N.