[deliverable/linux.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_HMAC
	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_ACL
	  bool "Provide CIFS ACL support (EXPERIMENTAL)"
	  depends on EXPERIMENTAL && CIFS_XATTR
	  help
	    Allows to fetch CIFS/NTFS ACL from the server.  The DACL blob
	    is handed over to the application/caller.

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
d2b91521 SP	6	select CRYPTO_MD5
362d3129	7	select CRYPTO_HMAC
d2b91521	8	select CRYPTO_ARC4
bb26b963 AD	9	help
	10	This is the client VFS module for the Common Internet File System
	11	(CIFS) protocol which is the successor to the Server Message Block
	12	(SMB) protocol, the native file sharing mechanism for most early
	13	PC operating systems. The CIFS protocol is fully supported by
	14	file servers such as Windows 2000 (including Windows 2003, NT 4
	15	and Windows XP) as well by Samba (which provides excellent CIFS
	16	server support for Linux and many other operating systems). Limited
	17	support for OS/2 and Windows ME and similar servers is provided as
	18	well.
	19
	20	The cifs module provides an advanced network file system
	21	client for mounting to CIFS compliant servers. It includes
	22	support for DFS (hierarchical name space), secure per-user
	23	session establishment via Kerberos or NTLM or NTLMv2,
	24	safe distributed caching (oplock), optional packet
	25	signing, Unicode and other internationalization improvements.
	26	If you need to mount to Samba or Windows from this machine, say Y.
	27
	28	config CIFS_STATS
	29	bool "CIFS statistics"
	30	depends on CIFS
	31	help
	32	Enabling this option will cause statistics for each server share
	33	mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
	34
	35	config CIFS_STATS2
	36	bool "Extended statistics"
	37	depends on CIFS_STATS
	38	help
	39	Enabling this option will allow more detailed statistics on SMB
	40	request timing to be displayed in /proc/fs/cifs/DebugData and also
	41	allow optional logging of slow responses to dmesg (depending on the
	42	value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	43	These additional statistics may have a minor effect on performance
	44	and memory utilization.
	45
	46	Unless you are a developer or are doing network performance analysis
	47	or tuning, say N.
	48
	49	config CIFS_WEAK_PW_HASH
	50	bool "Support legacy servers which use weaker LANMAN security"
	51	depends on CIFS
	52	help
	53	Modern CIFS servers including Samba and most Windows versions
	54	(since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	55	security mechanisms. These hash the password more securely
	56	than the mechanisms used in the older LANMAN version of the
	57	SMB protocol but LANMAN based authentication is needed to
	58	establish sessions with some old SMB servers.
	59
	60	Enabling this option allows the cifs module to mount to older
	61	LANMAN based servers such as OS/2 and Windows 95, but such
	62	mounts may be less secure than mounts using NTLM or more recent
	63	security mechanisms if you are on a public network. Unless you
	64	have a need to access old SMB servers (and are on a private
	65	network) you probably want to say N. Even if this support
	66	is enabled in the kernel build, LANMAN authentication will not be
	67	used automatically. At runtime LANMAN mounts are disabled but
	68	can be set to required (or optional) either in
	69	/proc/fs/cifs (see fs/cifs/README for more detail) or via an
	70	option on the mount command. This support is disabled by
	71	default in order to reduce the possibility of a downgrade
	72	attack.
73
74	If unsure, say N.
75
76	config CIFS_UPCALL
1a4240f4 WL	77	bool "Kerberos/SPNEGO advanced session setup"
	78	depends on CIFS && KEYS
	79	select DNS_RESOLVER
	80	help
	81	Enables an upcall mechanism for CIFS which accesses userspace helper
	82	utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	83	which are needed to mount to certain secure servers (for which more
	84	secure Kerberos authentication is required). If unsure, say N.
bb26b963 AD	85
	86	config CIFS_XATTR
	87	bool "CIFS extended attributes"
	88	depends on CIFS
	89	help
	90	Extended attributes are name:value pairs associated with inodes by
	91	the kernel or by users (see the attr(5) manual page, or visit
	92	<http://acl.bestbits.at/> for details). CIFS maps the name of
	93	extended attributes beginning with the user namespace prefix
	94	to SMB/CIFS EAs. EAs are stored on Windows servers without the
	95	user namespace prefix, but their names are seen by Linux cifs clients
	96	prefaced by the user namespace prefix. The system namespace
	97	(used by some filesystems to store ACLs) is not supported at
	98	this time.
	99
	100	If unsure, say N.
	101
	102	config CIFS_POSIX
	103	bool "CIFS POSIX Extensions"
	104	depends on CIFS_XATTR
	105	help
	106	Enabling this option will cause the cifs client to attempt to
	107	negotiate a newer dialect with servers, such as Samba 3.0.5
	108	or later, that optionally can handle more POSIX like (rather
	109	than Windows like) file behavior. It also enables
	110	support for POSIX ACLs (getfacl and setfacl) to servers
	111	(such as Samba 3.10 and later) which can negotiate
	112	CIFS POSIX ACL support. If unsure, say N.
	113
	114	config CIFS_DEBUG2
	115	bool "Enable additional CIFS debugging routines"
	116	depends on CIFS
	117	help
	118	Enabling this option adds a few more debugging routines
	119	to the cifs code which slightly increases the size of
	120	the cifs module and can cause additional logging of debug
	121	messages in some error paths, slowing performance. This
	122	option can be turned off unless you are debugging
	123	cifs problems. If unsure, say N.
	124
10e70afa SF	125	config CIFS_DFS_UPCALL
	126	bool "DFS feature support"
	127	depends on CIFS && KEYS
1a4240f4	128	select DNS_RESOLVER
10e70afa SF	129	help
	130	Distributed File System (DFS) support is used to access shares
	131	transparently in an enterprise name space, even if the share
	132	moves to a different server. This feature also enables
	133	an upcall mechanism for CIFS which contacts userspace helper
	134	utilities to provide server name resolution (host names to
	135	IP addresses) which is needed for implicit mounts of DFS junction
	136	points. If unsure, say N.
	137
3feb41cf SJ	138	config CIFS_FSCACHE
	139	bool "Provide CIFS client caching support (EXPERIMENTAL)"
	140	depends on EXPERIMENTAL
	141	depends on CIFS=m && FSCACHE \|\| CIFS=y && FSCACHE=y
	142	help
	143	Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	144	to be cached locally on disk through the general filesystem cache
	145	manager. If unsure, say N.
	146
fbeba8bb SP	147	config CIFS_ACL
	148	bool "Provide CIFS ACL support (EXPERIMENTAL)"
	149	depends on EXPERIMENTAL && CIFS_XATTR
	150	help
	151	Allows to fetch CIFS/NTFS ACL from the server. The DACL blob
	152	is handed over to the application/caller.
	153
bb26b963 AD	154	config CIFS_EXPERIMENTAL
	155	bool "CIFS Experimental Features (EXPERIMENTAL)"
	156	depends on CIFS && EXPERIMENTAL
	157	help
	158	Enables cifs features under testing. These features are
	159	experimental and currently include DFS support and directory
	160	change notification ie fcntl(F_DNOTIFY), as well as the upcall
	161	mechanism which will be used for Kerberos session negotiation
	162	and uid remapping. Some of these features also may depend on
	163	setting a value of 1 to the pseudo-file /proc/fs/cifs/Experimental
	164	(which is disabled by default). See the file fs/cifs/README
	165	for more details. If unsure, say N.
	166