[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_DES
	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_NFSD_EXPORT
	  bool "Allow nfsd to export CIFS file system (EXPERIMENTAL)"
	  depends on CIFS && EXPERIMENTAL
	  help
	   Allows NFS server to export a CIFS mounted share (nfsd over cifs)
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
43988d76	10	select CRYPTO_DES
bb26b963 AD	11	help
	12	This is the client VFS module for the Common Internet File System
	13	(CIFS) protocol which is the successor to the Server Message Block
	14	(SMB) protocol, the native file sharing mechanism for most early
	15	PC operating systems. The CIFS protocol is fully supported by
	16	file servers such as Windows 2000 (including Windows 2003, NT 4
	17	and Windows XP) as well by Samba (which provides excellent CIFS
	18	server support for Linux and many other operating systems). Limited
	19	support for OS/2 and Windows ME and similar servers is provided as
	20	well.
	21
	22	The cifs module provides an advanced network file system
	23	client for mounting to CIFS compliant servers. It includes
	24	support for DFS (hierarchical name space), secure per-user
	25	session establishment via Kerberos or NTLM or NTLMv2,
	26	safe distributed caching (oplock), optional packet
	27	signing, Unicode and other internationalization improvements.
	28	If you need to mount to Samba or Windows from this machine, say Y.
	29
	30	config CIFS_STATS
	31	bool "CIFS statistics"
	32	depends on CIFS
	33	help
	34	Enabling this option will cause statistics for each server share
	35	mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
	36
	37	config CIFS_STATS2
	38	bool "Extended statistics"
	39	depends on CIFS_STATS
	40	help
	41	Enabling this option will allow more detailed statistics on SMB
	42	request timing to be displayed in /proc/fs/cifs/DebugData and also
	43	allow optional logging of slow responses to dmesg (depending on the
	44	value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	45	These additional statistics may have a minor effect on performance
	46	and memory utilization.
	47
	48	Unless you are a developer or are doing network performance analysis
	49	or tuning, say N.
	50
	51	config CIFS_WEAK_PW_HASH
	52	bool "Support legacy servers which use weaker LANMAN security"
	53	depends on CIFS
	54	help
	55	Modern CIFS servers including Samba and most Windows versions
	56	(since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	57	security mechanisms. These hash the password more securely
	58	than the mechanisms used in the older LANMAN version of the
	59	SMB protocol but LANMAN based authentication is needed to
	60	establish sessions with some old SMB servers.
	61
	62	Enabling this option allows the cifs module to mount to older
	63	LANMAN based servers such as OS/2 and Windows 95, but such
	64	mounts may be less secure than mounts using NTLM or more recent
	65	security mechanisms if you are on a public network. Unless you
	66	have a need to access old SMB servers (and are on a private
	67	network) you probably want to say N. Even if this support
	68	is enabled in the kernel build, LANMAN authentication will not be
	69	used automatically. At runtime LANMAN mounts are disabled but
	70	can be set to required (or optional) either in
	71	/proc/fs/cifs (see fs/cifs/README for more detail) or via an
	72	option on the mount command. This support is disabled by
	73	default in order to reduce the possibility of a downgrade
	74	attack.
75
76	If unsure, say N.
77
78	config CIFS_UPCALL
1a4240f4 WL	79	bool "Kerberos/SPNEGO advanced session setup"
	80	depends on CIFS && KEYS
	81	select DNS_RESOLVER
	82	help
	83	Enables an upcall mechanism for CIFS which accesses userspace helper
	84	utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	85	which are needed to mount to certain secure servers (for which more
	86	secure Kerberos authentication is required). If unsure, say N.
bb26b963 AD	87
	88	config CIFS_XATTR
	89	bool "CIFS extended attributes"
	90	depends on CIFS
	91	help
	92	Extended attributes are name:value pairs associated with inodes by
	93	the kernel or by users (see the attr(5) manual page, or visit
	94	<http://acl.bestbits.at/> for details). CIFS maps the name of
	95	extended attributes beginning with the user namespace prefix
	96	to SMB/CIFS EAs. EAs are stored on Windows servers without the
	97	user namespace prefix, but their names are seen by Linux cifs clients
	98	prefaced by the user namespace prefix. The system namespace
	99	(used by some filesystems to store ACLs) is not supported at
	100	this time.
	101
	102	If unsure, say N.
	103
	104	config CIFS_POSIX
	105	bool "CIFS POSIX Extensions"
	106	depends on CIFS_XATTR
	107	help
	108	Enabling this option will cause the cifs client to attempt to
	109	negotiate a newer dialect with servers, such as Samba 3.0.5
	110	or later, that optionally can handle more POSIX like (rather
	111	than Windows like) file behavior. It also enables
	112	support for POSIX ACLs (getfacl and setfacl) to servers
	113	(such as Samba 3.10 and later) which can negotiate
	114	CIFS POSIX ACL support. If unsure, say N.
	115
	116	config CIFS_DEBUG2
	117	bool "Enable additional CIFS debugging routines"
	118	depends on CIFS
	119	help
	120	Enabling this option adds a few more debugging routines
	121	to the cifs code which slightly increases the size of
	122	the cifs module and can cause additional logging of debug
	123	messages in some error paths, slowing performance. This
	124	option can be turned off unless you are debugging
	125	cifs problems. If unsure, say N.
	126
10e70afa SF	127	config CIFS_DFS_UPCALL
	128	bool "DFS feature support"
	129	depends on CIFS && KEYS
1a4240f4	130	select DNS_RESOLVER
10e70afa SF	131	help
	132	Distributed File System (DFS) support is used to access shares
	133	transparently in an enterprise name space, even if the share
	134	moves to a different server. This feature also enables
	135	an upcall mechanism for CIFS which contacts userspace helper
	136	utilities to provide server name resolution (host names to
	137	IP addresses) which is needed for implicit mounts of DFS junction
	138	points. If unsure, say N.
	139
3feb41cf SJ	140	config CIFS_FSCACHE
	141	bool "Provide CIFS client caching support (EXPERIMENTAL)"
	142	depends on EXPERIMENTAL
	143	depends on CIFS=m && FSCACHE \|\| CIFS=y && FSCACHE=y
	144	help
	145	Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	146	to be cached locally on disk through the general filesystem cache
	147	manager. If unsure, say N.
	148
fbeba8bb SP	149	config CIFS_ACL
	150	bool "Provide CIFS ACL support (EXPERIMENTAL)"
	151	depends on EXPERIMENTAL && CIFS_XATTR
	152	help
	153	Allows to fetch CIFS/NTFS ACL from the server. The DACL blob
	154	is handed over to the application/caller.
	155
25720873 SP	156	config CIFS_NFSD_EXPORT
25720873 SP	157	bool "Allow nfsd to export CIFS file system (EXPERIMENTAL)"
bb26b963 AD	158	depends on CIFS && EXPERIMENTAL
bb26b963 AD	159	help
25720873	160	Allows NFS server to export a CIFS mounted share (nfsd over cifs)