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Alexey Dobriyanbb26b962008-10-18 20:28:49 -07001config CIFS
2 tristate "CIFS support (advanced network filesystem, SMBFS successor)"
3 depends on INET
4 select NLS
Shirish Pargaonkard2b91522010-10-21 14:25:08 -05005 select CRYPTO
6 select CRYPTO_MD5
7 select CRYPTO_ARC4
Alexey Dobriyanbb26b962008-10-18 20:28:49 -07008 help
9 This is the client VFS module for the Common Internet File System
10 (CIFS) protocol which is the successor to the Server Message Block
11 (SMB) protocol, the native file sharing mechanism for most early
12 PC operating systems. The CIFS protocol is fully supported by
13 file servers such as Windows 2000 (including Windows 2003, NT 4
14 and Windows XP) as well by Samba (which provides excellent CIFS
15 server support for Linux and many other operating systems). Limited
16 support for OS/2 and Windows ME and similar servers is provided as
17 well.
18
19 The cifs module provides an advanced network file system
20 client for mounting to CIFS compliant servers. It includes
21 support for DFS (hierarchical name space), secure per-user
22 session establishment via Kerberos or NTLM or NTLMv2,
23 safe distributed caching (oplock), optional packet
24 signing, Unicode and other internationalization improvements.
25 If you need to mount to Samba or Windows from this machine, say Y.
26
27config CIFS_STATS
28 bool "CIFS statistics"
29 depends on CIFS
30 help
31 Enabling this option will cause statistics for each server share
32 mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
33
34config CIFS_STATS2
35 bool "Extended statistics"
36 depends on CIFS_STATS
37 help
38 Enabling this option will allow more detailed statistics on SMB
39 request timing to be displayed in /proc/fs/cifs/DebugData and also
40 allow optional logging of slow responses to dmesg (depending on the
41 value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
42 These additional statistics may have a minor effect on performance
43 and memory utilization.
44
45 Unless you are a developer or are doing network performance analysis
46 or tuning, say N.
47
48config CIFS_WEAK_PW_HASH
49 bool "Support legacy servers which use weaker LANMAN security"
50 depends on CIFS
51 help
52 Modern CIFS servers including Samba and most Windows versions
53 (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
54 security mechanisms. These hash the password more securely
55 than the mechanisms used in the older LANMAN version of the
56 SMB protocol but LANMAN based authentication is needed to
57 establish sessions with some old SMB servers.
58
59 Enabling this option allows the cifs module to mount to older
60 LANMAN based servers such as OS/2 and Windows 95, but such
61 mounts may be less secure than mounts using NTLM or more recent
62 security mechanisms if you are on a public network. Unless you
63 have a need to access old SMB servers (and are on a private
64 network) you probably want to say N. Even if this support
65 is enabled in the kernel build, LANMAN authentication will not be
66 used automatically. At runtime LANMAN mounts are disabled but
67 can be set to required (or optional) either in
68 /proc/fs/cifs (see fs/cifs/README for more detail) or via an
69 option on the mount command. This support is disabled by
70 default in order to reduce the possibility of a downgrade
71 attack.
72
73 If unsure, say N.
74
75config CIFS_UPCALL
Wang Lei1a4240f2010-08-04 15:16:33 +010076 bool "Kerberos/SPNEGO advanced session setup"
77 depends on CIFS && KEYS
78 select DNS_RESOLVER
79 help
80 Enables an upcall mechanism for CIFS which accesses userspace helper
81 utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
82 which are needed to mount to certain secure servers (for which more
83 secure Kerberos authentication is required). If unsure, say N.
Alexey Dobriyanbb26b962008-10-18 20:28:49 -070084
85config CIFS_XATTR
86 bool "CIFS extended attributes"
87 depends on CIFS
88 help
89 Extended attributes are name:value pairs associated with inodes by
90 the kernel or by users (see the attr(5) manual page, or visit
91 <http://acl.bestbits.at/> for details). CIFS maps the name of
92 extended attributes beginning with the user namespace prefix
93 to SMB/CIFS EAs. EAs are stored on Windows servers without the
94 user namespace prefix, but their names are seen by Linux cifs clients
95 prefaced by the user namespace prefix. The system namespace
96 (used by some filesystems to store ACLs) is not supported at
97 this time.
98
99 If unsure, say N.
100
101config CIFS_POSIX
102 bool "CIFS POSIX Extensions"
103 depends on CIFS_XATTR
104 help
105 Enabling this option will cause the cifs client to attempt to
106 negotiate a newer dialect with servers, such as Samba 3.0.5
107 or later, that optionally can handle more POSIX like (rather
108 than Windows like) file behavior. It also enables
109 support for POSIX ACLs (getfacl and setfacl) to servers
110 (such as Samba 3.10 and later) which can negotiate
111 CIFS POSIX ACL support. If unsure, say N.
112
113config CIFS_DEBUG2
114 bool "Enable additional CIFS debugging routines"
115 depends on CIFS
116 help
117 Enabling this option adds a few more debugging routines
118 to the cifs code which slightly increases the size of
119 the cifs module and can cause additional logging of debug
120 messages in some error paths, slowing performance. This
121 option can be turned off unless you are debugging
122 cifs problems. If unsure, say N.
123
Steve French10e70af2009-02-22 01:33:07 +0000124config CIFS_DFS_UPCALL
125 bool "DFS feature support"
126 depends on CIFS && KEYS
Wang Lei1a4240f2010-08-04 15:16:33 +0100127 select DNS_RESOLVER
Steve French10e70af2009-02-22 01:33:07 +0000128 help
129 Distributed File System (DFS) support is used to access shares
130 transparently in an enterprise name space, even if the share
131 moves to a different server. This feature also enables
132 an upcall mechanism for CIFS which contacts userspace helper
133 utilities to provide server name resolution (host names to
134 IP addresses) which is needed for implicit mounts of DFS junction
135 points. If unsure, say N.
136
Suresh Jayaraman3feb41c2010-07-05 18:11:33 +0530137config CIFS_FSCACHE
138 bool "Provide CIFS client caching support (EXPERIMENTAL)"
139 depends on EXPERIMENTAL
140 depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
141 help
142 Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
143 to be cached locally on disk through the general filesystem cache
144 manager. If unsure, say N.
145
Alexey Dobriyanbb26b962008-10-18 20:28:49 -0700146config CIFS_EXPERIMENTAL
147 bool "CIFS Experimental Features (EXPERIMENTAL)"
148 depends on CIFS && EXPERIMENTAL
149 help
150 Enables cifs features under testing. These features are
151 experimental and currently include DFS support and directory
152 change notification ie fcntl(F_DNOTIFY), as well as the upcall
153 mechanism which will be used for Kerberos session negotiation
154 and uid remapping. Some of these features also may depend on
155 setting a value of 1 to the pseudo-file /proc/fs/cifs/Experimental
156 (which is disabled by default). See the file fs/cifs/README
157 for more details. If unsure, say N.
158