Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1# SPDX-License-Identifier: GPL-2.0-only
2config NFS_FS
3 tristate "NFS client support"
4 depends on INET && FILE_LOCKING && MULTIUSER
5 select CRC32
6 select LOCKD
7 select SUNRPC
8 select NFS_COMMON
9 select NFS_ACL_SUPPORT if NFS_V3_ACL
10 help
11 Choose Y here if you want to access files residing on other
12 computers using Sun's Network File System protocol. To compile
13 this file system support as a module, choose M here: the module
14 will be called nfs.
15
16 To mount file systems exported by NFS servers, you also need to
17 install the user space mount.nfs command which can be found in
18 the Linux nfs-utils package, available from http://linux-nfs.org/.
19 Information about using the mount command is available in the
20 mount(8) man page. More detail about the Linux NFS client
21 implementation is available via the nfs(5) man page.
22
23 Below you can choose which versions of the NFS protocol are
24 available in the kernel to mount NFS servers. Support for NFS
25 version 2 (RFC 1094) is always available when NFS_FS is selected.
26
27 To configure a system which mounts its root file system via NFS
28 at boot time, say Y here, select "Kernel level IP
29 autoconfiguration" in the NETWORK menu, and select "Root file
30 system on NFS" below. You cannot compile this file system as a
31 module in this case.
32
33 If unsure, say N.
34
35config NFS_V2
36 tristate "NFS client support for NFS version 2"
37 depends on NFS_FS
38 default n
39 help
40 This option enables support for version 2 of the NFS protocol
41 (RFC 1094) in the kernel's NFS client.
42
43 If unsure, say N.
44
45config NFS_V3
46 tristate "NFS client support for NFS version 3"
47 depends on NFS_FS
48 default y
49 help
50 This option enables support for version 3 of the NFS protocol
51 (RFC 1813) in the kernel's NFS client.
52
53 If unsure, say Y.
54
55config NFS_V3_ACL
56 bool "NFS client support for the NFSv3 ACL protocol extension"
57 depends on NFS_V3
58 help
59 Some NFS servers support an auxiliary NFSv3 ACL protocol that
60 Sun added to Solaris but never became an official part of the
61 NFS version 3 protocol. This protocol extension allows
62 applications on NFS clients to manipulate POSIX Access Control
63 Lists on files residing on NFS servers. NFS servers enforce
64 ACLs on local files whether this protocol is available or not.
65
66 Choose Y here if your NFS server supports the Solaris NFSv3 ACL
67 protocol extension and you want your NFS client to allow
68 applications to access and modify ACLs on files on the server.
69
70 Most NFS servers don't support the Solaris NFSv3 ACL protocol
71 extension. You can choose N here or specify the "noacl" mount
72 option to prevent your NFS client from trying to use the NFSv3
73 ACL protocol.
74
75 If unsure, say N.
76
77config NFS_V4
78 tristate "NFS client support for NFS version 4"
79 depends on NFS_FS
80 select KEYS
81 help
82 This option enables support for version 4 of the NFS protocol
83 (RFC 3530) in the kernel's NFS client.
84
85 To mount NFS servers using NFSv4, you also need to install user
86 space programs which can be found in the Linux nfs-utils package,
87 available from http://linux-nfs.org/.
88
89 If unsure, say Y.
90
91config NFS_SWAP
92 bool "Provide swap over NFS support"
93 default n
94 depends on NFS_FS && SWAP
95 select SUNRPC_SWAP
96 help
97 This option enables swapon to work on files located on NFS mounts.
98
99config NFS_V4_1
100 bool "NFS client support for NFSv4.1"
101 depends on NFS_V4
102 select SUNRPC_BACKCHANNEL
103 help
104 This option enables support for minor version 1 of the NFSv4 protocol
105 (RFC 5661) in the kernel's NFS client.
106
107 If unsure, say N.
108
109config NFS_V4_2
110 bool "NFS client support for NFSv4.2"
111 depends on NFS_V4_1
112 help
113 This option enables support for minor version 2 of the NFSv4 protocol
114 in the kernel's NFS client.
115
116 If unsure, say N.
117
118config PNFS_FILE_LAYOUT
119 tristate
120 depends on NFS_V4_1
121 default NFS_V4
122
123config PNFS_BLOCK
124 tristate
125 depends on NFS_V4_1 && BLK_DEV_DM
126 default NFS_V4
127
128config PNFS_FLEXFILE_LAYOUT
129 tristate
130 depends on NFS_V4_1
131 default NFS_V4
132
133config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
134 string "NFSv4.1 Implementation ID Domain"
135 depends on NFS_V4_1
136 default "kernel.org"
137 help
138 This option defines the domain portion of the implementation ID that
139 may be sent in the NFS exchange_id operation. The value must be in
140 the format of a DNS domain name and should be set to the DNS domain
141 name of the distribution.
142 If the NFS client is unchanged from the upstream kernel, this
143 option should be set to the default "kernel.org".
144
145config NFS_V4_1_MIGRATION
146 bool "NFSv4.1 client support for migration"
147 depends on NFS_V4_1
148 default n
149 help
150 This option makes the NFS client advertise to NFSv4.1 servers that
151 it can support NFSv4 migration.
152
153 The NFSv4.1 pieces of the Linux NFSv4 migration implementation are
154 still experimental. If you are not an NFSv4 developer, say N here.
155
156config NFS_V4_SECURITY_LABEL
157 bool
158 depends on NFS_V4_2 && SECURITY
159 default y
160
161config ROOT_NFS
162 bool "Root file system on NFS"
163 depends on NFS_FS=y && IP_PNP
164 help
165 If you want your system to mount its root file system via NFS,
166 choose Y here. This is common practice for managing systems
167 without local permanent storage. For details, read
168 <file:Documentation/admin-guide/nfs/nfsroot.rst>.
169
170 Most people say N here.
171
172config NFS_FSCACHE
173 bool "Provide NFS client caching support"
174 depends on NFS_FS
175 select NETFS_SUPPORT
176 select FSCACHE
177 help
178 Say Y here if you want NFS data to be cached locally on disc through
179 the general filesystem cache manager
180
181config NFS_USE_LEGACY_DNS
182 bool "Use the legacy NFS DNS resolver"
183 depends on NFS_V4
184 help
185 The kernel now provides a method for translating a host name into an
186 IP address. Select Y here if you would rather use your own DNS
187 resolver script.
188
189 If unsure, say N
190
191config NFS_USE_KERNEL_DNS
192 bool
193 depends on NFS_V4 && !NFS_USE_LEGACY_DNS
194 select DNS_RESOLVER
195 default y
196
197config NFS_DEBUG
198 bool
199 depends on NFS_FS && SUNRPC_DEBUG
200 default y
201
202config NFS_DISABLE_UDP_SUPPORT
203 bool "NFS: Disable NFS UDP protocol support"
204 depends on NFS_FS
205 default y
206 help
207 Choose Y here to disable the use of NFS over UDP. NFS over UDP
208 on modern networks (1Gb+) can lead to data corruption caused by
209 fragmentation during high loads.
210
211config NFS_V4_2_READ_PLUS
212 bool "NFS: Enable support for the NFSv4.2 READ_PLUS operation"
213 depends on NFS_V4_2
214 default y
215 help
216 Choose Y here to enable use of the NFS v4.2 READ_PLUS operation.