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 select SUNRPC_BACKCHANNEL 82 help 83 This option enables support for version 4.1 of the NFS protocol 84 (RFC 5661) in the kernel's NFS client. 85 86 To mount NFS servers using NFSv4, you also need to install user 87 space programs which can be found in the Linux nfs-utils package, 88 available from http://linux-nfs.org/. 89 90 If unsure, say N. 91 92config NFS_SWAP 93 bool "Provide swap over NFS support" 94 default n 95 depends on NFS_FS && SWAP 96 select SUNRPC_SWAP 97 help 98 This option enables swapon to work on files located on NFS mounts. 99 100config NFS_V4_0 101 bool "NFS client support for NFSv4.0" 102 depends on NFS_V4 103 default y 104 help 105 This option enables support for minor version 0 of the NFSv4 protocol 106 (RFC 3530) in the kernel's NFS client. 107 108 If unsure, say N. 109 110config NFS_V4_2 111 bool "NFS client support for NFSv4.2" 112 depends on NFS_V4 113 help 114 This option enables support for minor version 2 of the NFSv4 protocol 115 in the kernel's NFS client. 116 117 If unsure, say N. 118 119config PNFS_FILE_LAYOUT 120 tristate 121 depends on NFS_V4 122 default NFS_V4 123 124config PNFS_BLOCK 125 tristate 126 depends on NFS_V4 && BLK_DEV_DM 127 default NFS_V4 128 129config PNFS_FLEXFILE_LAYOUT 130 tristate 131 depends on NFS_V4 132 default NFS_V4 133 134config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN 135 string "NFSv4.1 Implementation ID Domain" 136 depends on NFS_V4 137 default "kernel.org" 138 help 139 This option defines the domain portion of the implementation ID that 140 may be sent in the NFS exchange_id operation. The value must be in 141 the format of a DNS domain name and should be set to the DNS domain 142 name of the distribution. 143 If the NFS client is unchanged from the upstream kernel, this 144 option should be set to the default "kernel.org". 145 146config NFS_V4_1_MIGRATION 147 bool "NFSv4.1 client support for migration" 148 depends on NFS_V4 149 default n 150 help 151 This option makes the NFS client advertise to NFSv4.1 servers that 152 it can support NFSv4 migration. 153 154 The NFSv4.1 pieces of the Linux NFSv4 migration implementation are 155 still experimental. If you are not an NFSv4 developer, say N here. 156 157config NFS_V4_SECURITY_LABEL 158 bool 159 depends on NFS_V4_2 && SECURITY 160 default y 161 162config ROOT_NFS 163 bool "Root file system on NFS" 164 depends on NFS_FS=y && IP_PNP 165 help 166 If you want your system to mount its root file system via NFS, 167 choose Y here. This is common practice for managing systems 168 without local permanent storage. For details, read 169 <file:Documentation/admin-guide/nfs/nfsroot.rst>. 170 171 Most people say N here. 172 173config NFS_FSCACHE 174 bool "Provide NFS client caching support" 175 depends on NFS_FS 176 select NETFS_SUPPORT 177 select FSCACHE 178 help 179 Say Y here if you want NFS data to be cached locally on disc through 180 the general filesystem cache manager 181 182config NFS_USE_LEGACY_DNS 183 bool "Use the legacy NFS DNS resolver" 184 depends on NFS_V4 185 help 186 The kernel now provides a method for translating a host name into an 187 IP address. Select Y here if you would rather use your own DNS 188 resolver script. 189 190 If unsure, say N 191 192config NFS_USE_KERNEL_DNS 193 bool 194 depends on NFS_V4 && !NFS_USE_LEGACY_DNS 195 select DNS_RESOLVER 196 default y 197 198config NFS_DEBUG 199 bool 200 depends on NFS_FS && SUNRPC_DEBUG 201 default y 202 203config NFS_DISABLE_UDP_SUPPORT 204 bool "NFS: Disable NFS UDP protocol support" 205 depends on NFS_FS 206 default y 207 help 208 Choose Y here to disable the use of NFS over UDP. NFS over UDP 209 on modern networks (1Gb+) can lead to data corruption caused by 210 fragmentation during high loads. 211 212config NFS_V4_2_READ_PLUS 213 bool "NFS: Enable support for the NFSv4.2 READ_PLUS operation" 214 depends on NFS_V4_2 215 default y 216 help 217 Choose Y here to enable use of the NFS v4.2 READ_PLUS operation. 218