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