fs/cifs/Kconfig

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