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