1config 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 select CRYPTO_ECB 11 select CRYPTO_DES 12 select CRYPTO_SHA256 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 18 file servers such as Windows 2000 (including Windows 2003, Windows 2008, 19 NT 4 and Windows XP) as well by Samba (which provides excellent CIFS 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 32config 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 39config 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 53config 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 80config CIFS_UPCALL 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. 89 90config 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 106config 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 118config 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 125config CIFS_DEBUG 126 bool "Enable CIFS debugging routines" 127 default y 128 depends on CIFS 129 help 130 Enabling this option adds helpful debugging messages to 131 the cifs code which increases the size of the cifs module. 132 If unsure, say Y. 133config CIFS_DEBUG2 134 bool "Enable additional CIFS debugging routines" 135 depends on CIFS_DEBUG 136 help 137 Enabling this option adds a few more debugging routines 138 to the cifs code which slightly increases the size of 139 the cifs module and can cause additional logging of debug 140 messages in some error paths, slowing performance. This 141 option can be turned off unless you are debugging 142 cifs problems. If unsure, say N. 143 144config CIFS_DFS_UPCALL 145 bool "DFS feature support" 146 depends on CIFS && KEYS 147 select DNS_RESOLVER 148 help 149 Distributed File System (DFS) support is used to access shares 150 transparently in an enterprise name space, even if the share 151 moves to a different server. This feature also enables 152 an upcall mechanism for CIFS which contacts userspace helper 153 utilities to provide server name resolution (host names to 154 IP addresses) which is needed for implicit mounts of DFS junction 155 points. If unsure, say N. 156 157config CIFS_NFSD_EXPORT 158 bool "Allow nfsd to export CIFS file system" 159 depends on CIFS && BROKEN 160 help 161 Allows NFS server to export a CIFS mounted share (nfsd over cifs) 162 163config CIFS_SMB2 164 bool "SMB2 network file system support" 165 depends on CIFS && INET 166 select NLS 167 select KEYS 168 select FSCACHE 169 select DNS_RESOLVER 170 171 help 172 This enables experimental support for the SMB2 (Server Message Block 173 version 2) protocol. The SMB2 protocol is the successor to the 174 popular CIFS and SMB network file sharing protocols. SMB2 is the 175 native file sharing mechanism for recent versions of Windows 176 operating systems (since Vista). SMB2 enablement will eventually 177 allow users better performance, security and features, than would be 178 possible with cifs. Note that smb2 mount options also are simpler 179 (compared to cifs) due to protocol improvements. 180 181 Unless you are a developer or tester, say N. 182 183config CIFS_FSCACHE 184 bool "Provide CIFS client caching support" 185 depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y 186 help 187 Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data 188 to be cached locally on disk through the general filesystem cache 189 manager. If unsure, say N. 190 191