[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_MD4
	select CRYPTO_MD5
	select CRYPTO_HMAC
	select CRYPTO_ARC4
	select CRYPTO_ECB
	select CRYPTO_DES
	select CRYPTO_SHA256
	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, Windows 2008,
	  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_ACL
	  bool "Provide CIFS ACL support"
	  depends on CIFS_XATTR && KEYS
	  help
	    Allows fetching CIFS/NTFS ACL from the server.  The DACL blob
	    is handed over to the application/caller.

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_NFSD_EXPORT
	  bool "Allow nfsd to export CIFS file system (EXPERIMENTAL)"
	  depends on CIFS && EXPERIMENTAL && BROKEN
	  help
	   Allows NFS server to export a CIFS mounted share (nfsd over cifs)

config CIFS_SMB2
	bool "SMB2 network file system support (EXPERIMENTAL)"
	depends on CIFS && EXPERIMENTAL && INET
	select NLS
	select KEYS
	select FSCACHE
	select DNS_RESOLVER

	help
	  This enables experimental support for the SMB2 (Server Message Block
	  version 2) protocol. The SMB2 protocol is the successor to the
	  popular CIFS and SMB network file sharing protocols. SMB2 is the
	  native file sharing mechanism for recent versions of Windows
	  operating systems (since Vista).  SMB2 enablement will eventually
	  allow users better performance, security and features, than would be
	  possible with cifs. Note that smb2 mount options also are simpler
	  (compared to cifs) due to protocol improvements.

	  Unless you are a developer or tester, say N.

config CIFS_FSCACHE
	  bool "Provide CIFS client caching support"
	  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.
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	5	select CRYPTO
f855f6cb	6	select CRYPTO_MD4
d2b91521	7	select CRYPTO_MD5
362d3129	8	select CRYPTO_HMAC
d2b91521	9	select CRYPTO_ARC4
5f0b23ee	10	select CRYPTO_ECB
43988d76	11	select CRYPTO_DES
3c1bf7e4	12	select CRYPTO_SHA256
bb26b963 AD	13	help
	14	This is the client VFS module for the Common Internet File System
	15	(CIFS) protocol which is the successor to the Server Message Block
	16	(SMB) protocol, the native file sharing mechanism for most early
	17	PC operating systems. The CIFS protocol is fully supported by
1d4ab907 SF	18	file servers such as Windows 2000 (including Windows 2003, Windows 2008,
1d4ab907 SF	19	NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
bb26b963 AD	20	server support for Linux and many other operating systems). Limited
	21	support for OS/2 and Windows ME and similar servers is provided as
	22	well.
	23
	24	The cifs module provides an advanced network file system
	25	client for mounting to CIFS compliant servers. It includes
	26	support for DFS (hierarchical name space), secure per-user
	27	session establishment via Kerberos or NTLM or NTLMv2,
	28	safe distributed caching (oplock), optional packet
	29	signing, Unicode and other internationalization improvements.
	30	If you need to mount to Samba or Windows from this machine, say Y.
	31
	32	config CIFS_STATS
	33	bool "CIFS statistics"
	34	depends on CIFS
	35	help
	36	Enabling this option will cause statistics for each server share
	37	mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
	38
	39	config CIFS_STATS2
	40	bool "Extended statistics"
	41	depends on CIFS_STATS
	42	help
	43	Enabling this option will allow more detailed statistics on SMB
	44	request timing to be displayed in /proc/fs/cifs/DebugData and also
	45	allow optional logging of slow responses to dmesg (depending on the
	46	value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	47	These additional statistics may have a minor effect on performance
	48	and memory utilization.
	49
	50	Unless you are a developer or are doing network performance analysis
	51	or tuning, say N.
	52
	53	config CIFS_WEAK_PW_HASH
	54	bool "Support legacy servers which use weaker LANMAN security"
	55	depends on CIFS
	56	help
	57	Modern CIFS servers including Samba and most Windows versions
	58	(since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	59	security mechanisms. These hash the password more securely
	60	than the mechanisms used in the older LANMAN version of the
	61	SMB protocol but LANMAN based authentication is needed to
	62	establish sessions with some old SMB servers.
	63
	64	Enabling this option allows the cifs module to mount to older
	65	LANMAN based servers such as OS/2 and Windows 95, but such
	66	mounts may be less secure than mounts using NTLM or more recent
	67	security mechanisms if you are on a public network. Unless you
	68	have a need to access old SMB servers (and are on a private
	69	network) you probably want to say N. Even if this support
	70	is enabled in the kernel build, LANMAN authentication will not be
	71	used automatically. At runtime LANMAN mounts are disabled but
	72	can be set to required (or optional) either in
	73	/proc/fs/cifs (see fs/cifs/README for more detail) or via an
	74	option on the mount command. This support is disabled by
	75	default in order to reduce the possibility of a downgrade
	76	attack.
	77
	78	If unsure, say N.
	79
	80	config CIFS_UPCALL
1a4240f4 WL	81	bool "Kerberos/SPNEGO advanced session setup"
	82	depends on CIFS && KEYS
	83	select DNS_RESOLVER
	84	help
	85	Enables an upcall mechanism for CIFS which accesses userspace helper
	86	utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	87	which are needed to mount to certain secure servers (for which more
	88	secure Kerberos authentication is required). If unsure, say N.
bb26b963 AD	89
	90	config CIFS_XATTR
	91	bool "CIFS extended attributes"
	92	depends on CIFS
	93	help
	94	Extended attributes are name:value pairs associated with inodes by
	95	the kernel or by users (see the attr(5) manual page, or visit
	96	<http://acl.bestbits.at/> for details). CIFS maps the name of
	97	extended attributes beginning with the user namespace prefix
	98	to SMB/CIFS EAs. EAs are stored on Windows servers without the
	99	user namespace prefix, but their names are seen by Linux cifs clients
	100	prefaced by the user namespace prefix. The system namespace
	101	(used by some filesystems to store ACLs) is not supported at
	102	this time.
	103
	104	If unsure, say N.
	105
	106	config CIFS_POSIX
	107	bool "CIFS POSIX Extensions"
	108	depends on CIFS_XATTR
	109	help
	110	Enabling this option will cause the cifs client to attempt to
	111	negotiate a newer dialect with servers, such as Samba 3.0.5
	112	or later, that optionally can handle more POSIX like (rather
	113	than Windows like) file behavior. It also enables
	114	support for POSIX ACLs (getfacl and setfacl) to servers
	115	(such as Samba 3.10 and later) which can negotiate
	116	CIFS POSIX ACL support. If unsure, say N.
	117
1d4ab907 SF	118	config CIFS_ACL
	119	bool "Provide CIFS ACL support"
	120	depends on CIFS_XATTR && KEYS
	121	help
	122	Allows fetching CIFS/NTFS ACL from the server. The DACL blob
	123	is handed over to the application/caller.
	124
bb26b963 AD	125	config CIFS_DEBUG2
	126	bool "Enable additional CIFS debugging routines"
	127	depends on CIFS
	128	help
	129	Enabling this option adds a few more debugging routines
	130	to the cifs code which slightly increases the size of
	131	the cifs module and can cause additional logging of debug
	132	messages in some error paths, slowing performance. This
	133	option can be turned off unless you are debugging
	134	cifs problems. If unsure, say N.
	135
10e70afa SF	136	config CIFS_DFS_UPCALL
	137	bool "DFS feature support"
	138	depends on CIFS && KEYS
1a4240f4	139	select DNS_RESOLVER
10e70afa SF	140	help
	141	Distributed File System (DFS) support is used to access shares
	142	transparently in an enterprise name space, even if the share
	143	moves to a different server. This feature also enables
	144	an upcall mechanism for CIFS which contacts userspace helper
	145	utilities to provide server name resolution (host names to
	146	IP addresses) which is needed for implicit mounts of DFS junction
	147	points. If unsure, say N.
	148
25720873 SP	149	config CIFS_NFSD_EXPORT
25720873 SP	150	bool "Allow nfsd to export CIFS file system (EXPERIMENTAL)"
9b8e072a	151	depends on CIFS && EXPERIMENTAL && BROKEN
bb26b963	152	help
25720873	153	Allows NFS server to export a CIFS mounted share (nfsd over cifs)
675f36fb SF	154
	155	config CIFS_SMB2
	156	bool "SMB2 network file system support (EXPERIMENTAL)"
1d4ab907	157	depends on CIFS && EXPERIMENTAL && INET
675f36fb SF	158	select NLS
	159	select KEYS
	160	select FSCACHE
	161	select DNS_RESOLVER
	162
	163	help
	164	This enables experimental support for the SMB2 (Server Message Block
	165	version 2) protocol. The SMB2 protocol is the successor to the
	166	popular CIFS and SMB network file sharing protocols. SMB2 is the
	167	native file sharing mechanism for recent versions of Windows
	168	operating systems (since Vista). SMB2 enablement will eventually
	169	allow users better performance, security and features, than would be
	170	possible with cifs. Note that smb2 mount options also are simpler
	171	(compared to cifs) due to protocol improvements.
	172
	173	Unless you are a developer or tester, say N.
1d4ab907 SF	174
	175	config CIFS_FSCACHE
	176	bool "Provide CIFS client caching support"
	177	depends on CIFS=m && FSCACHE \|\| CIFS=y && FSCACHE=y
	178	help
	179	Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	180	to be cached locally on disk through the general filesystem cache
	181	manager. If unsure, say N.
	182