fs/nfs/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config NFS_FS
   3         tristate "NFS client support"
   4         depends on INET && FILE_LOCKING && MULTIUSER
   5         select LOCKD
   6         select SUNRPC
   7         select NFS_ACL_SUPPORT if NFS_V3_ACL
   8         help
   9           Choose Y here if you want to access files residing on other
  10           computers using Sun's Network File System protocol.  To compile
  11           this file system support as a module, choose M here: the module
  12           will be called nfs.
  13
  14           To mount file systems exported by NFS servers, you also need to
  15           install the user space mount.nfs command which can be found in
  16           the Linux nfs-utils package, available from http://linux-nfs.org/.
  17           Information about using the mount command is available in the
  18           mount(8) man page.  More detail about the Linux NFS client
  19           implementation is available via the nfs(5) man page.
  20
  21           Below you can choose which versions of the NFS protocol are
  22           available in the kernel to mount NFS servers.  Support for NFS
  23           version 2 (RFC 1094) is always available when NFS_FS is selected.
  24
  25           To configure a system which mounts its root file system via NFS
  26           at boot time, say Y here, select "Kernel level IP
  27           autoconfiguration" in the NETWORK menu, and select "Root file
  28           system on NFS" below.  You cannot compile this file system as a
  29           module in this case.
  30
  31           If unsure, say N.
  32
  33 config NFS_V2
  34         tristate "NFS client support for NFS version 2"
  35         depends on NFS_FS
  36         default y
  37         help
  38           This option enables support for version 2 of the NFS protocol
  39           (RFC 1094) in the kernel's NFS client.
  40
  41           If unsure, say Y.
  42
  43 config NFS_V3
  44         tristate "NFS client support for NFS version 3"
  45         depends on NFS_FS
  46         default y
  47         help
  48           This option enables support for version 3 of the NFS protocol
  49           (RFC 1813) in the kernel's NFS client.
  50
  51           If unsure, say Y.
  52
  53 config NFS_V3_ACL
  54         bool "NFS client support for the NFSv3 ACL protocol extension"
  55         depends on NFS_V3
  56         help
  57           Some NFS servers support an auxiliary NFSv3 ACL protocol that
  58           Sun added to Solaris but never became an official part of the
  59           NFS version 3 protocol.  This protocol extension allows
  60           applications on NFS clients to manipulate POSIX Access Control
  61           Lists on files residing on NFS servers.  NFS servers enforce
  62           ACLs on local files whether this protocol is available or not.
  63
  64           Choose Y here if your NFS server supports the Solaris NFSv3 ACL
  65           protocol extension and you want your NFS client to allow
  66           applications to access and modify ACLs on files on the server.
  67
  68           Most NFS servers don't support the Solaris NFSv3 ACL protocol
  69           extension.  You can choose N here or specify the "noacl" mount
  70           option to prevent your NFS client from trying to use the NFSv3
  71           ACL protocol.
  72
  73           If unsure, say N.
  74
  75 config NFS_V4
  76         tristate "NFS client support for NFS version 4"
  77         depends on NFS_FS
  78         select SUNRPC_GSS
  79         select KEYS
  80         help
  81           This option enables support for version 4 of the NFS protocol
  82           (RFC 3530) in the kernel's NFS client.
  83
  84           To mount NFS servers using NFSv4, you also need to install user
  85           space programs which can be found in the Linux nfs-utils package,
  86           available from http://linux-nfs.org/.
  87
  88           If unsure, say Y.
  89
  90 config NFS_SWAP
  91         bool "Provide swap over NFS support"
  92         default n
  93         depends on NFS_FS && SWAP
  94         select SUNRPC_SWAP
  95         help
  96           This option enables swapon to work on files located on NFS mounts.
  97
  98 config NFS_V4_1
  99         bool "NFS client support for NFSv4.1"
 100         depends on NFS_V4
 101         select SUNRPC_BACKCHANNEL
 102         help
 103           This option enables support for minor version 1 of the NFSv4 protocol
 104           (RFC 5661) in the kernel's NFS client.
 105
 106           If unsure, say N.
 107
 108 config NFS_V4_2
 109         bool "NFS client support for NFSv4.2"
 110         depends on NFS_V4_1
 111         help
 112           This option enables support for minor version 2 of the NFSv4 protocol
 113           in the kernel's NFS client.
 114
 115           If unsure, say N.
 116
 117 config PNFS_FILE_LAYOUT
 118         tristate
 119         depends on NFS_V4_1
 120         default NFS_V4
 121
 122 config PNFS_BLOCK
 123         tristate
 124         depends on NFS_V4_1 && BLK_DEV_DM
 125         default NFS_V4
 126
 127 config PNFS_FLEXFILE_LAYOUT
 128         tristate
 129         depends on NFS_V4_1 && NFS_V3
 130         default NFS_V4
 131
 132 config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
 133         string "NFSv4.1 Implementation ID Domain"
 134         depends on NFS_V4_1
 135         default "kernel.org"
 136         help
 137           This option defines the domain portion of the implementation ID that
 138           may be sent in the NFS exchange_id operation.  The value must be in
 139           the format of a DNS domain name and should be set to the DNS domain
 140           name of the distribution.
 141           If the NFS client is unchanged from the upstream kernel, this
 142           option should be set to the default "kernel.org".
 143
 144 config NFS_V4_1_MIGRATION
 145         bool "NFSv4.1 client support for migration"
 146         depends on NFS_V4_1
 147         default n
 148         help
 149           This option makes the NFS client advertise to NFSv4.1 servers that
 150           it can support NFSv4 migration.
 151
 152           The NFSv4.1 pieces of the Linux NFSv4 migration implementation are
 153           still experimental.  If you are not an NFSv4 developer, say N here.
 154
 155 config NFS_V4_SECURITY_LABEL
 156         bool
 157         depends on NFS_V4_2 && SECURITY
 158         default y
 159
 160 config ROOT_NFS
 161         bool "Root file system on NFS"
 162         depends on NFS_FS=y && IP_PNP
 163         help
 164           If you want your system to mount its root file system via NFS,
 165           choose Y here.  This is common practice for managing systems
 166           without local permanent storage.  For details, read
 167           <file:Documentation/admin-guide/nfs/nfsroot.rst>.
 168
 169           Most people say N here.
 170
 171 config NFS_FSCACHE
 172         bool "Provide NFS client caching support"
 173         depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
 174         help
 175           Say Y here if you want NFS data to be cached locally on disc through
 176           the general filesystem cache manager
 177
 178 config NFS_USE_LEGACY_DNS
 179         bool "Use the legacy NFS DNS resolver"
 180         depends on NFS_V4
 181         help
 182           The kernel now provides a method for translating a host name into an
 183           IP address.  Select Y here if you would rather use your own DNS
 184           resolver script.
 185
 186           If unsure, say N
 187
 188 config NFS_USE_KERNEL_DNS
 189         bool
 190         depends on NFS_V4 && !NFS_USE_LEGACY_DNS
 191         select DNS_RESOLVER
 192         default y
 193
 194 config NFS_DEBUG
 195         bool
 196         depends on NFS_FS && SUNRPC_DEBUG
 197         select CRC32
 198         default y
 199
 200 config NFS_DISABLE_UDP_SUPPORT
 201        bool "NFS: Disable NFS UDP protocol support"
 202        depends on NFS_FS
 203        default y
 204        help
 205          Choose Y here to disable the use of NFS over UDP. NFS over UDP
 206          on modern networks (1Gb+) can lead to data corruption caused by
 207          fragmentation during high loads.
 208
 209 config NFS_V4_2_READ_PLUS
 210         bool "NFS: Enable support for the NFSv4.2 READ_PLUS operation"
 211         depends on NFS_V4_2
 212         default n
 213         help
 214          This is intended for developers only. The READ_PLUS operation has
 215          been shown to have issues under specific conditions and should not
 216          be used in production.