| # 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 RPCSEC_GSS_KRB5 |
| 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. |
