1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "NFS client support"
4 depends on INET && FILE_LOCKING && MULTIUSER
7 select NFS_ACL_SUPPORT if NFS_V3_ACL
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
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.
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.
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
34 tristate "NFS client support for NFS version 2"
38 This option enables support for version 2 of the NFS protocol
39 (RFC 1094) in the kernel's NFS client.
44 tristate "NFS client support for NFS version 3"
48 This option enables support for version 3 of the NFS protocol
49 (RFC 1813) in the kernel's NFS client.
54 bool "NFS client support for the NFSv3 ACL protocol extension"
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.
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.
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
76 tristate "NFS client support for NFS version 4"
81 This option enables support for version 4 of the NFS protocol
82 (RFC 3530) in the kernel's NFS client.
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/.
91 bool "Provide swap over NFS support"
93 depends on NFS_FS && SWAP
96 This option enables swapon to work on files located on NFS mounts.
99 bool "NFS client support for NFSv4.1"
101 select SUNRPC_BACKCHANNEL
103 This option enables support for minor version 1 of the NFSv4 protocol
104 (RFC 5661) in the kernel's NFS client.
109 bool "NFS client support for NFSv4.2"
112 This option enables support for minor version 2 of the NFSv4 protocol
113 in the kernel's NFS client.
117 config PNFS_FILE_LAYOUT
124 depends on NFS_V4_1 && BLK_DEV_DM
127 config PNFS_FLEXFILE_LAYOUT
129 depends on NFS_V4_1 && NFS_V3
132 config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
133 string "NFSv4.1 Implementation ID Domain"
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".
144 config NFS_V4_1_MIGRATION
145 bool "NFSv4.1 client support for migration"
149 This option makes the NFS client advertise to NFSv4.1 servers that
150 it can support NFSv4 migration.
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.
155 config NFS_V4_SECURITY_LABEL
157 depends on NFS_V4_2 && SECURITY
161 bool "Root file system on NFS"
162 depends on NFS_FS=y && IP_PNP
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>.
169 Most people say N here.
172 bool "Provide NFS client caching support"
173 depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
175 Say Y here if you want NFS data to be cached locally on disc through
176 the general filesystem cache manager
178 config NFS_USE_LEGACY_DNS
179 bool "Use the legacy NFS DNS resolver"
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
188 config NFS_USE_KERNEL_DNS
190 depends on NFS_V4 && !NFS_USE_LEGACY_DNS
196 depends on NFS_FS && SUNRPC_DEBUG
200 config NFS_DISABLE_UDP_SUPPORT
201 bool "NFS: Disable NFS UDP protocol support"
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.