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. 217