2 tristate "CIFS support (advanced network filesystem, SMBFS successor)"
14 This is the client VFS module for the Common Internet File System
15 (CIFS) protocol which is the successor to the Server Message Block
16 (SMB) protocol, the native file sharing mechanism for most early
17 PC operating systems. The CIFS protocol is fully supported by
18 file servers such as Windows 2000 (including Windows 2003, Windows 2008,
19 NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
20 server support for Linux and many other operating systems). Limited
21 support for OS/2 and Windows ME and similar servers is provided as
24 The cifs module provides an advanced network file system
25 client for mounting to CIFS compliant servers. It includes
26 support for DFS (hierarchical name space), secure per-user
27 session establishment via Kerberos or NTLM or NTLMv2,
28 safe distributed caching (oplock), optional packet
29 signing, Unicode and other internationalization improvements.
30 If you need to mount to Samba or Windows from this machine, say Y.
33 bool "CIFS statistics"
36 Enabling this option will cause statistics for each server share
37 mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
40 bool "Extended statistics"
43 Enabling this option will allow more detailed statistics on SMB
44 request timing to be displayed in /proc/fs/cifs/DebugData and also
45 allow optional logging of slow responses to dmesg (depending on the
46 value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
47 These additional statistics may have a minor effect on performance
48 and memory utilization.
50 Unless you are a developer or are doing network performance analysis
53 config CIFS_WEAK_PW_HASH
54 bool "Support legacy servers which use weaker LANMAN security"
57 Modern CIFS servers including Samba and most Windows versions
58 (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
59 security mechanisms. These hash the password more securely
60 than the mechanisms used in the older LANMAN version of the
61 SMB protocol but LANMAN based authentication is needed to
62 establish sessions with some old SMB servers.
64 Enabling this option allows the cifs module to mount to older
65 LANMAN based servers such as OS/2 and Windows 95, but such
66 mounts may be less secure than mounts using NTLM or more recent
67 security mechanisms if you are on a public network. Unless you
68 have a need to access old SMB servers (and are on a private
69 network) you probably want to say N. Even if this support
70 is enabled in the kernel build, LANMAN authentication will not be
71 used automatically. At runtime LANMAN mounts are disabled but
72 can be set to required (or optional) either in
73 /proc/fs/cifs (see fs/cifs/README for more detail) or via an
74 option on the mount command. This support is disabled by
75 default in order to reduce the possibility of a downgrade
81 bool "Kerberos/SPNEGO advanced session setup"
82 depends on CIFS && KEYS
85 Enables an upcall mechanism for CIFS which accesses userspace helper
86 utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
87 which are needed to mount to certain secure servers (for which more
88 secure Kerberos authentication is required). If unsure, say N.
91 bool "CIFS extended attributes"
94 Extended attributes are name:value pairs associated with inodes by
95 the kernel or by users (see the attr(5) manual page, or visit
96 <http://acl.bestbits.at/> for details). CIFS maps the name of
97 extended attributes beginning with the user namespace prefix
98 to SMB/CIFS EAs. EAs are stored on Windows servers without the
99 user namespace prefix, but their names are seen by Linux cifs clients
100 prefaced by the user namespace prefix. The system namespace
101 (used by some filesystems to store ACLs) is not supported at
107 bool "CIFS POSIX Extensions"
108 depends on CIFS_XATTR
110 Enabling this option will cause the cifs client to attempt to
111 negotiate a newer dialect with servers, such as Samba 3.0.5
112 or later, that optionally can handle more POSIX like (rather
113 than Windows like) file behavior. It also enables
114 support for POSIX ACLs (getfacl and setfacl) to servers
115 (such as Samba 3.10 and later) which can negotiate
116 CIFS POSIX ACL support. If unsure, say N.
119 bool "Provide CIFS ACL support"
120 depends on CIFS_XATTR && KEYS
122 Allows fetching CIFS/NTFS ACL from the server. The DACL blob
123 is handed over to the application/caller.
126 bool "Enable additional CIFS debugging routines"
129 Enabling this option adds a few more debugging routines
130 to the cifs code which slightly increases the size of
131 the cifs module and can cause additional logging of debug
132 messages in some error paths, slowing performance. This
133 option can be turned off unless you are debugging
134 cifs problems. If unsure, say N.
136 config CIFS_DFS_UPCALL
137 bool "DFS feature support"
138 depends on CIFS && KEYS
141 Distributed File System (DFS) support is used to access shares
142 transparently in an enterprise name space, even if the share
143 moves to a different server. This feature also enables
144 an upcall mechanism for CIFS which contacts userspace helper
145 utilities to provide server name resolution (host names to
146 IP addresses) which is needed for implicit mounts of DFS junction
147 points. If unsure, say N.
149 config CIFS_NFSD_EXPORT
150 bool "Allow nfsd to export CIFS file system (EXPERIMENTAL)"
151 depends on CIFS && EXPERIMENTAL && BROKEN
153 Allows NFS server to export a CIFS mounted share (nfsd over cifs)
156 bool "SMB2 network file system support (EXPERIMENTAL)"
157 depends on CIFS && EXPERIMENTAL && INET
164 This enables experimental support for the SMB2 (Server Message Block
165 version 2) protocol. The SMB2 protocol is the successor to the
166 popular CIFS and SMB network file sharing protocols. SMB2 is the
167 native file sharing mechanism for recent versions of Windows
168 operating systems (since Vista). SMB2 enablement will eventually
169 allow users better performance, security and features, than would be
170 possible with cifs. Note that smb2 mount options also are simpler
171 (compared to cifs) due to protocol improvements.
173 Unless you are a developer or tester, say N.
176 bool "Provide CIFS client caching support"
177 depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
179 Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
180 to be cached locally on disk through the general filesystem cache
181 manager. If unsure, say N.