[net-next-2.6.git] / fs / cifs / Kconfig

config CIFS
	tristate "CIFS support (advanced network filesystem, SMBFS successor)"
	depends on INET
	select NLS
	select CRYPTO
	select CRYPTO_MD5
	select CRYPTO_ARC4
	help
	  This is the client VFS module for the Common Internet File System
	  (CIFS) protocol which is the successor to the Server Message Block
	  (SMB) protocol, the native file sharing mechanism for most early
	  PC operating systems.  The CIFS protocol is fully supported by
	  file servers such as Windows 2000 (including Windows 2003, NT 4
	  and Windows XP) as well by Samba (which provides excellent CIFS
	  server support for Linux and many other operating systems). Limited
	  support for OS/2 and Windows ME and similar servers is provided as
	  well.

	  The cifs module provides an advanced network file system
	  client for mounting to CIFS compliant servers.  It includes
	  support for DFS (hierarchical name space), secure per-user
	  session establishment via Kerberos or NTLM or NTLMv2,
	  safe distributed caching (oplock), optional packet
	  signing, Unicode and other internationalization improvements.
	  If you need to mount to Samba or Windows from this machine, say Y.

config CIFS_STATS
        bool "CIFS statistics"
        depends on CIFS
        help
          Enabling this option will cause statistics for each server share
	  mounted by the cifs client to be displayed in /proc/fs/cifs/Stats

config CIFS_STATS2
	bool "Extended statistics"
	depends on CIFS_STATS
	help
	  Enabling this option will allow more detailed statistics on SMB
	  request timing to be displayed in /proc/fs/cifs/DebugData and also
	  allow optional logging of slow responses to dmesg (depending on the
	  value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	  These additional statistics may have a minor effect on performance
	  and memory utilization.

	  Unless you are a developer or are doing network performance analysis
	  or tuning, say N.

config CIFS_WEAK_PW_HASH
	bool "Support legacy servers which use weaker LANMAN security"
	depends on CIFS
	help
	  Modern CIFS servers including Samba and most Windows versions
	  (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	  security mechanisms. These hash the password more securely
	  than the mechanisms used in the older LANMAN version of the
	  SMB protocol but LANMAN based authentication is needed to
	  establish sessions with some old SMB servers.

	  Enabling this option allows the cifs module to mount to older
	  LANMAN based servers such as OS/2 and Windows 95, but such
	  mounts may be less secure than mounts using NTLM or more recent
	  security mechanisms if you are on a public network.  Unless you
	  have a need to access old SMB servers (and are on a private
	  network) you probably want to say N.  Even if this support
	  is enabled in the kernel build, LANMAN authentication will not be
	  used automatically. At runtime LANMAN mounts are disabled but
	  can be set to required (or optional) either in
	  /proc/fs/cifs (see fs/cifs/README for more detail) or via an
	  option on the mount command. This support is disabled by
	  default in order to reduce the possibility of a downgrade
	  attack.

	  If unsure, say N.

config CIFS_UPCALL
	bool "Kerberos/SPNEGO advanced session setup"
	depends on CIFS && KEYS
	select DNS_RESOLVER
	help
	  Enables an upcall mechanism for CIFS which accesses userspace helper
	  utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	  which are needed to mount to certain secure servers (for which more
	  secure Kerberos authentication is required). If unsure, say N.

config CIFS_XATTR
        bool "CIFS extended attributes"
        depends on CIFS
        help
          Extended attributes are name:value pairs associated with inodes by
          the kernel or by users (see the attr(5) manual page, or visit
          <http://acl.bestbits.at/> for details).  CIFS maps the name of
          extended attributes beginning with the user namespace prefix
          to SMB/CIFS EAs. EAs are stored on Windows servers without the
          user namespace prefix, but their names are seen by Linux cifs clients
          prefaced by the user namespace prefix. The system namespace
          (used by some filesystems to store ACLs) is not supported at
          this time.

          If unsure, say N.

config CIFS_POSIX
        bool "CIFS POSIX Extensions"
        depends on CIFS_XATTR
        help
          Enabling this option will cause the cifs client to attempt to
	  negotiate a newer dialect with servers, such as Samba 3.0.5
	  or later, that optionally can handle more POSIX like (rather
	  than Windows like) file behavior.  It also enables
	  support for POSIX ACLs (getfacl and setfacl) to servers
	  (such as Samba 3.10 and later) which can negotiate
	  CIFS POSIX ACL support.  If unsure, say N.

config CIFS_DEBUG2
	bool "Enable additional CIFS debugging routines"
	depends on CIFS
	help
	   Enabling this option adds a few more debugging routines
	   to the cifs code which slightly increases the size of
	   the cifs module and can cause additional logging of debug
	   messages in some error paths, slowing performance. This
	   option can be turned off unless you are debugging
	   cifs problems.  If unsure, say N.

config CIFS_DFS_UPCALL
	  bool "DFS feature support"
	  depends on CIFS && KEYS
	  select DNS_RESOLVER
	  help
	    Distributed File System (DFS) support is used to access shares
	    transparently in an enterprise name space, even if the share
	    moves to a different server.  This feature also enables
	    an upcall mechanism for CIFS which contacts userspace helper
	    utilities to provide server name resolution (host names to
	    IP addresses) which is needed for implicit mounts of DFS junction
	    points. If unsure, say N.

config CIFS_FSCACHE
	  bool "Provide CIFS client caching support (EXPERIMENTAL)"
	  depends on EXPERIMENTAL
	  depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
	  help
	    Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	    to be cached locally on disk through the general filesystem cache
	    manager. If unsure, say N.

config CIFS_EXPERIMENTAL
	  bool "CIFS Experimental Features (EXPERIMENTAL)"
	  depends on CIFS && EXPERIMENTAL
	  help
	    Enables cifs features under testing. These features are
	    experimental and currently include DFS support and directory
	    change notification ie fcntl(F_DNOTIFY), as well as the upcall
	    mechanism which will be used for Kerberos session negotiation
	    and uid remapping.  Some of these features also may depend on
	    setting a value of 1 to the pseudo-file /proc/fs/cifs/Experimental
	    (which is disabled by default). See the file fs/cifs/README
	    for more details.  If unsure, say N.
Commit	Line	Data
bb26b963 AD	1	config CIFS
	2	tristate "CIFS support (advanced network filesystem, SMBFS successor)"
	3	depends on INET
	4	select NLS
d2b91521 SP	5	select CRYPTO
	6	select CRYPTO_MD5
	7	select CRYPTO_ARC4
bb26b963 AD	8	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
	27	config 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
	34	config 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
	48	config 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
75	config CIFS_UPCALL
1a4240f4 WL	76	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.
bb26b963 AD	84
	85	config 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
	101	config 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
	113	config 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
10e70afa SF	124	config CIFS_DFS_UPCALL
	125	bool "DFS feature support"
	126	depends on CIFS && KEYS
1a4240f4	127	select DNS_RESOLVER
10e70afa SF	128	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
3feb41cf SJ	137	config 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
bb26b963 AD	146	config 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