[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_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
9fbc5908 SF	5	select CRYPTO_MD5
9fbc5908 SF	6	select CRYPTO_ARC4
bb26b963 AD	7	help
	8	This is the client VFS module for the Common Internet File System
	9	(CIFS) protocol which is the successor to the Server Message Block
	10	(SMB) protocol, the native file sharing mechanism for most early
	11	PC operating systems. The CIFS protocol is fully supported by
	12	file servers such as Windows 2000 (including Windows 2003, NT 4
	13	and Windows XP) as well by Samba (which provides excellent CIFS
	14	server support for Linux and many other operating systems). Limited
	15	support for OS/2 and Windows ME and similar servers is provided as
	16	well.
	17
	18	The cifs module provides an advanced network file system
	19	client for mounting to CIFS compliant servers. It includes
	20	support for DFS (hierarchical name space), secure per-user
	21	session establishment via Kerberos or NTLM or NTLMv2,
	22	safe distributed caching (oplock), optional packet
	23	signing, Unicode and other internationalization improvements.
	24	If you need to mount to Samba or Windows from this machine, say Y.
	25
	26	config CIFS_STATS
	27	bool "CIFS statistics"
	28	depends on CIFS
	29	help
	30	Enabling this option will cause statistics for each server share
	31	mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
	32
	33	config CIFS_STATS2
	34	bool "Extended statistics"
	35	depends on CIFS_STATS
	36	help
	37	Enabling this option will allow more detailed statistics on SMB
	38	request timing to be displayed in /proc/fs/cifs/DebugData and also
	39	allow optional logging of slow responses to dmesg (depending on the
	40	value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	41	These additional statistics may have a minor effect on performance
	42	and memory utilization.
	43
	44	Unless you are a developer or are doing network performance analysis
	45	or tuning, say N.
	46
	47	config CIFS_WEAK_PW_HASH
	48	bool "Support legacy servers which use weaker LANMAN security"
	49	depends on CIFS
	50	help
	51	Modern CIFS servers including Samba and most Windows versions
	52	(since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	53	security mechanisms. These hash the password more securely
	54	than the mechanisms used in the older LANMAN version of the
	55	SMB protocol but LANMAN based authentication is needed to
	56	establish sessions with some old SMB servers.
	57
	58	Enabling this option allows the cifs module to mount to older
	59	LANMAN based servers such as OS/2 and Windows 95, but such
	60	mounts may be less secure than mounts using NTLM or more recent
	61	security mechanisms if you are on a public network. Unless you
	62	have a need to access old SMB servers (and are on a private
	63	network) you probably want to say N. Even if this support
	64	is enabled in the kernel build, LANMAN authentication will not be
	65	used automatically. At runtime LANMAN mounts are disabled but
	66	can be set to required (or optional) either in
	67	/proc/fs/cifs (see fs/cifs/README for more detail) or via an
	68	option on the mount command. This support is disabled by
	69	default in order to reduce the possibility of a downgrade
	70	attack.
71
72	If unsure, say N.
73
74	config CIFS_UPCALL
1a4240f4 WL	75	bool "Kerberos/SPNEGO advanced session setup"
	76	depends on CIFS && KEYS
	77	select DNS_RESOLVER
	78	help
	79	Enables an upcall mechanism for CIFS which accesses userspace helper
	80	utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	81	which are needed to mount to certain secure servers (for which more
	82	secure Kerberos authentication is required). If unsure, say N.
bb26b963 AD	83
	84	config CIFS_XATTR
	85	bool "CIFS extended attributes"
	86	depends on CIFS
	87	help
	88	Extended attributes are name:value pairs associated with inodes by
	89	the kernel or by users (see the attr(5) manual page, or visit
	90	<http://acl.bestbits.at/> for details). CIFS maps the name of
	91	extended attributes beginning with the user namespace prefix
	92	to SMB/CIFS EAs. EAs are stored on Windows servers without the
	93	user namespace prefix, but their names are seen by Linux cifs clients
	94	prefaced by the user namespace prefix. The system namespace
	95	(used by some filesystems to store ACLs) is not supported at
	96	this time.
	97
	98	If unsure, say N.
	99
	100	config CIFS_POSIX
	101	bool "CIFS POSIX Extensions"
	102	depends on CIFS_XATTR
	103	help
	104	Enabling this option will cause the cifs client to attempt to
	105	negotiate a newer dialect with servers, such as Samba 3.0.5
	106	or later, that optionally can handle more POSIX like (rather
	107	than Windows like) file behavior. It also enables
	108	support for POSIX ACLs (getfacl and setfacl) to servers
	109	(such as Samba 3.10 and later) which can negotiate
	110	CIFS POSIX ACL support. If unsure, say N.
	111
	112	config CIFS_DEBUG2
	113	bool "Enable additional CIFS debugging routines"
	114	depends on CIFS
	115	help
	116	Enabling this option adds a few more debugging routines
	117	to the cifs code which slightly increases the size of
	118	the cifs module and can cause additional logging of debug
	119	messages in some error paths, slowing performance. This
	120	option can be turned off unless you are debugging
	121	cifs problems. If unsure, say N.
	122
10e70afa SF	123	config CIFS_DFS_UPCALL
	124	bool "DFS feature support"
	125	depends on CIFS && KEYS
1a4240f4	126	select DNS_RESOLVER
10e70afa SF	127	help
	128	Distributed File System (DFS) support is used to access shares
	129	transparently in an enterprise name space, even if the share
	130	moves to a different server. This feature also enables
	131	an upcall mechanism for CIFS which contacts userspace helper
	132	utilities to provide server name resolution (host names to
	133	IP addresses) which is needed for implicit mounts of DFS junction
	134	points. If unsure, say N.
	135
3feb41cf SJ	136	config CIFS_FSCACHE
	137	bool "Provide CIFS client caching support (EXPERIMENTAL)"
	138	depends on EXPERIMENTAL
	139	depends on CIFS=m && FSCACHE \|\| CIFS=y && FSCACHE=y
	140	help
	141	Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	142	to be cached locally on disk through the general filesystem cache
	143	manager. If unsure, say N.
	144
bb26b963 AD	145	config CIFS_EXPERIMENTAL
	146	bool "CIFS Experimental Features (EXPERIMENTAL)"
	147	depends on CIFS && EXPERIMENTAL
	148	help
	149	Enables cifs features under testing. These features are
	150	experimental and currently include DFS support and directory
	151	change notification ie fcntl(F_DNOTIFY), as well as the upcall
	152	mechanism which will be used for Kerberos session negotiation
	153	and uid remapping. Some of these features also may depend on
	154	setting a value of 1 to the pseudo-file /proc/fs/cifs/Experimental
	155	(which is disabled by default). See the file fs/cifs/README
	156	for more details. If unsure, say N.
	157