1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "NFS server support"
5 depends on FILE_LOCKING
11 select NFS_ACL_SUPPORT if NFSD_V2_ACL
12 select NFS_ACL_SUPPORT if NFSD_V3_ACL
15 Choose Y here if you want to allow other computers to access
16 files residing on this system using Sun's Network File System
17 protocol. To compile the NFS server support as a module,
18 choose M here: the module will be called nfsd.
20 You may choose to use a user-space NFS server instead, in which
21 case you can choose N here.
23 To export local file systems using NFS, you also need to install
24 user space programs which can be found in the Linux nfs-utils
25 package, available from http://linux-nfs.org/. More detail about
26 the Linux NFS server implementation is available via the
29 Below you can choose which versions of the NFS protocol are
30 available to clients mounting the NFS server on this system.
31 Support for NFS version 3 (RFC 1813) is always available when
32 CONFIG_NFSD is selected.
37 bool "NFS server support for NFS version 2 (DEPRECATED)"
41 NFSv2 (RFC 1094) was the first publicly-released version of NFS.
42 Unless you are hosting ancient (1990's era) NFS clients, you don't
48 bool "NFS server support for the NFSv2 ACL protocol extension"
52 bool "NFS server support for the NFSv3 ACL protocol extension"
55 Solaris NFS servers support an auxiliary NFSv3 ACL protocol that
56 never became an official part of the NFS version 3 protocol.
57 This protocol extension allows applications on NFS clients to
58 manipulate POSIX Access Control Lists on files residing on NFS
59 servers. NFS servers enforce POSIX ACLs on local files whether
60 this protocol is available or not.
62 This option enables support in your system's NFS server for the
63 NFSv3 ACL protocol extension allowing NFS clients to manipulate
64 POSIX ACLs on files exported by your system's NFS server. NFS
65 clients which support the Solaris NFSv3 ACL protocol can then
66 access and modify ACLs on your NFS server.
68 To store ACLs on your NFS server, you also need to enable ACL-
69 related CONFIG options for your local file systems of choice.
74 bool "NFS server support for NFS version 4"
75 depends on NFSD && PROC_FS
77 select RPCSEC_GSS_KRB5
82 select NFS_V4_2_SSC_HELPER if NFS_V4_2
84 This option enables support in your system's NFS server for
85 version 4 of the NFS protocol (RFC 3530).
87 To export files using NFSv4, you need to install additional user
88 space programs which can be found in the Linux nfs-utils package,
89 available from http://linux-nfs.org/.
96 config NFSD_BLOCKLAYOUT
97 bool "NFSv4.1 server support for pNFS block layouts"
98 depends on NFSD_V4 && BLOCK
100 select EXPORTFS_BLOCK_OPS
102 This option enables support for the exporting pNFS block layouts
103 in the kernel's NFS server. The pNFS block layout enables NFS
104 clients to directly perform I/O to block devices accessible to both
105 the server and the clients. See RFC 5663 for more details.
109 config NFSD_SCSILAYOUT
110 bool "NFSv4.1 server support for pNFS SCSI layouts"
111 depends on NFSD_V4 && BLOCK
113 select EXPORTFS_BLOCK_OPS
115 This option enables support for the exporting pNFS SCSI layouts
116 in the kernel's NFS server. The pNFS SCSI layout enables NFS
117 clients to directly perform I/O to SCSI devices accessible to both
118 the server and the clients. See draft-ietf-nfsv4-scsi-layout for
123 config NFSD_FLEXFILELAYOUT
124 bool "NFSv4.1 server support for pNFS Flex File layouts"
128 This option enables support for the exporting pNFS Flex File
129 layouts in the kernel's NFS server. The pNFS Flex File layout
130 enables NFS clients to directly perform I/O to NFSv3 devices
131 accessible to both the server and the clients. See
132 draft-ietf-nfsv4-flex-files for more details.
134 Warning, this server implements the bare minimum functionality
135 to be a flex file server - it is for testing the client,
136 not for use in production.
140 config NFSD_V4_2_INTER_SSC
141 bool "NFSv4.2 inter server to server COPY"
142 depends on NFSD_V4 && NFS_V4_2
144 This option enables support for NFSv4.2 inter server to
145 server copy where the destination server calls the NFSv4.2
146 client to read the data to copy from the source server.
150 config NFSD_V4_SECURITY_LABEL
151 bool "Provide Security Label support for NFSv4 server"
152 depends on NFSD_V4 && SECURITY
155 Say Y here if you want enable fine-grained security label attribute
156 support for NFS version 4. Security labels allow security modules like
157 SELinux and Smack to label files to facilitate enforcement of their policies.
158 Without this an NFSv4 mount will have the same label on each file.
160 If you do not wish to enable fine-grained security labels SELinux or
161 Smack policies on NFSv4 files, say N.
163 config NFSD_LEGACY_CLIENT_TRACKING
164 bool "Support legacy NFSv4 client tracking methods (DEPRECATED)"
168 The NFSv4 server needs to store a small amount of information on
169 stable storage in order to handle state recovery after reboot. Most
170 modern deployments upcall to a userland daemon for this (nfsdcld),
171 but older NFS servers may store information directly in a
172 recoverydir, or spawn a process directly using a usermodehelper
175 These legacy client tracking methods have proven to be probelmatic
176 and will be removed in the future. Say Y here if you need support
177 for them in the interim.