LXR linux/fs/nfs/Kconfig

   1# SPDX-License-Identifier: GPL-2.0-only
   2config 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
  33config 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
  43config 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
  53config 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
  75config 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
  90config 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
  98config 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
 108config 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
 117config PNFS_FILE_LAYOUT
 118        tristate
 119        depends on NFS_V4_1
 120        default NFS_V4
 121
 122config PNFS_BLOCK
 123        tristate
 124        depends on NFS_V4_1 && BLK_DEV_DM
 125        default NFS_V4
 126
 127config PNFS_FLEXFILE_LAYOUT
 128        tristate
 129        depends on NFS_V4_1 && NFS_V3
 130        default m
 131
 132config 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
 144config 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
 155config NFS_V4_SECURITY_LABEL
 156        bool
 157        depends on NFS_V4_2 && SECURITY
 158        default y
 159
 160config 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
 171config 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
 178config 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
 188config NFS_USE_KERNEL_DNS
 189        bool
 190        depends on NFS_V4 && !NFS_USE_LEGACY_DNS
 191        select DNS_RESOLVER
 192        default y
 193
 194config NFS_DEBUG
 195        bool
 196        depends on NFS_FS && SUNRPC_DEBUG
 197        select CRC32
 198        default y
 199
 200config 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