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+# SPDX-License-Identifier: GPL-2.0-only
+config NFS_FS
+ tristate "NFS client support"
+ depends on INET && FILE_LOCKING && MULTIUSER
+ select LOCKD
+ select SUNRPC
+ select NFS_ACL_SUPPORT if NFS_V3_ACL
+ help
+ Choose Y here if you want to access files residing on other
+ computers using Sun's Network File System protocol. To compile
+ this file system support as a module, choose M here: the module
+ will be called nfs.
+
+ To mount file systems exported by NFS servers, you also need to
+ install the user space mount.nfs command which can be found in
+ the Linux nfs-utils package, available from http://linux-nfs.org/.
+ Information about using the mount command is available in the
+ mount(8) man page. More detail about the Linux NFS client
+ implementation is available via the nfs(5) man page.
+
+ Below you can choose which versions of the NFS protocol are
+ available in the kernel to mount NFS servers. Support for NFS
+ version 2 (RFC 1094) is always available when NFS_FS is selected.
+
+ To configure a system which mounts its root file system via NFS
+ at boot time, say Y here, select "Kernel level IP
+ autoconfiguration" in the NETWORK menu, and select "Root file
+ system on NFS" below. You cannot compile this file system as a
+ module in this case.
+
+ If unsure, say N.
+
+config NFS_V2
+ tristate "NFS client support for NFS version 2"
+ depends on NFS_FS
+ default y
+ help
+ This option enables support for version 2 of the NFS protocol
+ (RFC 1094) in the kernel's NFS client.
+
+ If unsure, say Y.
+
+config NFS_V3
+ tristate "NFS client support for NFS version 3"
+ depends on NFS_FS
+ default y
+ help
+ This option enables support for version 3 of the NFS protocol
+ (RFC 1813) in the kernel's NFS client.
+
+ If unsure, say Y.
+
+config NFS_V3_ACL
+ bool "NFS client support for the NFSv3 ACL protocol extension"
+ depends on NFS_V3
+ help
+ Some NFS servers support an auxiliary NFSv3 ACL protocol that
+ Sun added to Solaris but never became an official part of the
+ NFS version 3 protocol. This protocol extension allows
+ applications on NFS clients to manipulate POSIX Access Control
+ Lists on files residing on NFS servers. NFS servers enforce
+ ACLs on local files whether this protocol is available or not.
+
+ Choose Y here if your NFS server supports the Solaris NFSv3 ACL
+ protocol extension and you want your NFS client to allow
+ applications to access and modify ACLs on files on the server.
+
+ Most NFS servers don't support the Solaris NFSv3 ACL protocol
+ extension. You can choose N here or specify the "noacl" mount
+ option to prevent your NFS client from trying to use the NFSv3
+ ACL protocol.
+
+ If unsure, say N.
+
+config NFS_V4
+ tristate "NFS client support for NFS version 4"
+ depends on NFS_FS
+ select SUNRPC_GSS
+ select KEYS
+ help
+ This option enables support for version 4 of the NFS protocol
+ (RFC 3530) in the kernel's NFS client.
+
+ To mount NFS servers using NFSv4, you also need to install user
+ space programs which can be found in the Linux nfs-utils package,
+ available from http://linux-nfs.org/.
+
+ If unsure, say Y.
+
+config NFS_SWAP
+ bool "Provide swap over NFS support"
+ default n
+ depends on NFS_FS && SWAP
+ select SUNRPC_SWAP
+ help
+ This option enables swapon to work on files located on NFS mounts.
+
+config NFS_V4_1
+ bool "NFS client support for NFSv4.1"
+ depends on NFS_V4
+ select SUNRPC_BACKCHANNEL
+ help
+ This option enables support for minor version 1 of the NFSv4 protocol
+ (RFC 5661) in the kernel's NFS client.
+
+ If unsure, say N.
+
+config NFS_V4_2
+ bool "NFS client support for NFSv4.2"
+ depends on NFS_V4_1
+ help
+ This option enables support for minor version 2 of the NFSv4 protocol
+ in the kernel's NFS client.
+
+ If unsure, say N.
+
+config PNFS_FILE_LAYOUT
+ tristate
+ depends on NFS_V4_1
+ default NFS_V4
+
+config PNFS_BLOCK
+ tristate
+ depends on NFS_V4_1 && BLK_DEV_DM
+ default NFS_V4
+
+config PNFS_FLEXFILE_LAYOUT
+ tristate
+ depends on NFS_V4_1 && NFS_V3
+ default NFS_V4
+
+config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
+ string "NFSv4.1 Implementation ID Domain"
+ depends on NFS_V4_1
+ default "kernel.org"
+ help
+ This option defines the domain portion of the implementation ID that
+ may be sent in the NFS exchange_id operation. The value must be in
+ the format of a DNS domain name and should be set to the DNS domain
+ name of the distribution.
+ If the NFS client is unchanged from the upstream kernel, this
+ option should be set to the default "kernel.org".
+
+config NFS_V4_1_MIGRATION
+ bool "NFSv4.1 client support for migration"
+ depends on NFS_V4_1
+ default n
+ help
+ This option makes the NFS client advertise to NFSv4.1 servers that
+ it can support NFSv4 migration.
+
+ The NFSv4.1 pieces of the Linux NFSv4 migration implementation are
+ still experimental. If you are not an NFSv4 developer, say N here.
+
+config NFS_V4_SECURITY_LABEL
+ bool
+ depends on NFS_V4_2 && SECURITY
+ default y
+
+config ROOT_NFS
+ bool "Root file system on NFS"
+ depends on NFS_FS=y && IP_PNP
+ help
+ If you want your system to mount its root file system via NFS,
+ choose Y here. This is common practice for managing systems
+ without local permanent storage. For details, read
+ <file:Documentation/admin-guide/nfs/nfsroot.rst>.
+
+ Most people say N here.
+
+config NFS_FSCACHE
+ bool "Provide NFS client caching support"
+ depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
+ help
+ Say Y here if you want NFS data to be cached locally on disc through
+ the general filesystem cache manager
+
+config NFS_USE_LEGACY_DNS
+ bool "Use the legacy NFS DNS resolver"
+ depends on NFS_V4
+ help
+ The kernel now provides a method for translating a host name into an
+ IP address. Select Y here if you would rather use your own DNS
+ resolver script.
+
+ If unsure, say N
+
+config NFS_USE_KERNEL_DNS
+ bool
+ depends on NFS_V4 && !NFS_USE_LEGACY_DNS
+ select DNS_RESOLVER
+ default y
+
+config NFS_DEBUG
+ bool
+ depends on NFS_FS && SUNRPC_DEBUG
+ select CRC32
+ default y
+
+config NFS_DISABLE_UDP_SUPPORT
+ bool "NFS: Disable NFS UDP protocol support"
+ depends on NFS_FS
+ default y
+ help
+ Choose Y here to disable the use of NFS over UDP. NFS over UDP
+ on modern networks (1Gb+) can lead to data corruption caused by
+ fragmentation during high loads.
+
+config NFS_V4_2_READ_PLUS
+ bool "NFS: Enable support for the NFSv4.2 READ_PLUS operation"
+ depends on NFS_V4_2
+ default n
+ help
+ This is intended for developers only. The READ_PLUS operation has
+ been shown to have issues under specific conditions and should not
+ be used in production.