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