1# SPDX-License-Identifier: GPL-2.0-only 2config NFSD 3 tristate "NFS server support" 4 depends on INET 5 depends on FILE_LOCKING 6 depends on FSNOTIFY 7 select CRC32 8 select LOCKD 9 select SUNRPC 10 select EXPORTFS 11 select NFS_COMMON 12 select NFS_ACL_SUPPORT if NFSD_V2_ACL 13 select NFS_ACL_SUPPORT if NFSD_V3_ACL 14 depends on MULTIUSER 15 help 16 Choose Y here if you want to allow other computers to access 17 files residing on this system using Sun's Network File System 18 protocol. To compile the NFS server support as a module, 19 choose M here: the module will be called nfsd. 20 21 You may choose to use a user-space NFS server instead, in which 22 case you can choose N here. 23 24 To export local file systems using NFS, you also need to install 25 user space programs which can be found in the Linux nfs-utils 26 package, available from http://linux-nfs.org/. More detail about 27 the Linux NFS server implementation is available via the 28 exports(5) man page. 29 30 Below you can choose which versions of the NFS protocol are 31 available to clients mounting the NFS server on this system. 32 Support for NFS version 3 (RFC 1813) is always available when 33 CONFIG_NFSD is selected. 34 35 If unsure, say N. 36 37config NFSD_V2 38 bool "NFS server support for NFS version 2 (DEPRECATED)" 39 depends on NFSD 40 default n 41 help 42 NFSv2 (RFC 1094) was the first publicly-released version of NFS. 43 Unless you are hosting ancient (1990's era) NFS clients, you don't 44 need this. 45 46 If unsure, say N. 47 48config NFSD_V2_ACL 49 bool "NFS server support for the NFSv2 ACL protocol extension" 50 depends on NFSD_V2 51 52config NFSD_V3_ACL 53 bool "NFS server support for the NFSv3 ACL protocol extension" 54 depends on NFSD 55 help 56 Solaris NFS servers support an auxiliary NFSv3 ACL protocol that 57 never became an official part of the NFS version 3 protocol. 58 This protocol extension allows applications on NFS clients to 59 manipulate POSIX Access Control Lists on files residing on NFS 60 servers. NFS servers enforce POSIX ACLs on local files whether 61 this protocol is available or not. 62 63 This option enables support in your system's NFS server for the 64 NFSv3 ACL protocol extension allowing NFS clients to manipulate 65 POSIX ACLs on files exported by your system's NFS server. NFS 66 clients which support the Solaris NFSv3 ACL protocol can then 67 access and modify ACLs on your NFS server. 68 69 To store ACLs on your NFS server, you also need to enable ACL- 70 related CONFIG options for your local file systems of choice. 71 72 If unsure, say N. 73 74config NFSD_V4 75 bool "NFS server support for NFS version 4" 76 depends on NFSD && PROC_FS 77 select FS_POSIX_ACL 78 select RPCSEC_GSS_KRB5 79 select CRYPTO 80 select CRYPTO_MD5 81 select CRYPTO_SHA256 82 select GRACE_PERIOD 83 select NFS_V4_2_SSC_HELPER if NFS_V4_2 84 help 85 This option enables support in your system's NFS server for 86 version 4 of the NFS protocol (RFC 3530). 87 88 To export files using NFSv4, you need to install additional user 89 space programs which can be found in the Linux nfs-utils package, 90 available from http://linux-nfs.org/. 91 92 If unsure, say N. 93 94config NFSD_PNFS 95 bool 96 97config NFSD_BLOCKLAYOUT 98 bool "NFSv4.1 server support for pNFS block layouts" 99 depends on NFSD_V4 && BLOCK 100 select NFSD_PNFS 101 select EXPORTFS_BLOCK_OPS 102 help 103 This option enables support for the exporting pNFS block layouts 104 in the kernel's NFS server. The pNFS block layout enables NFS 105 clients to directly perform I/O to block devices accessible to both 106 the server and the clients. See RFC 5663 for more details. 107 108 If unsure, say N. 109 110config NFSD_SCSILAYOUT 111 bool "NFSv4.1 server support for pNFS SCSI layouts" 112 depends on NFSD_V4 && BLOCK 113 select NFSD_PNFS 114 select EXPORTFS_BLOCK_OPS 115 help 116 This option enables support for the exporting pNFS SCSI layouts 117 in the kernel's NFS server. The pNFS SCSI layout enables NFS 118 clients to directly perform I/O to SCSI devices accessible to both 119 the server and the clients. See draft-ietf-nfsv4-scsi-layout for 120 more details. 121 122 If unsure, say N. 123 124config NFSD_FLEXFILELAYOUT 125 bool "NFSv4.1 server support for pNFS Flex File layouts" 126 depends on NFSD_V4 127 select NFSD_PNFS 128 help 129 This option enables support for the exporting pNFS Flex File 130 layouts in the kernel's NFS server. The pNFS Flex File layout 131 enables NFS clients to directly perform I/O to NFSv3 devices 132 accessible to both the server and the clients. See 133 draft-ietf-nfsv4-flex-files for more details. 134 135 Warning, this server implements the bare minimum functionality 136 to be a flex file server - it is for testing the client, 137 not for use in production. 138 139 If unsure, say N. 140 141config NFSD_V4_2_INTER_SSC 142 bool "NFSv4.2 inter server to server COPY" 143 depends on NFSD_V4 && NFS_V4_2 144 help 145 This option enables support for NFSv4.2 inter server to 146 server copy where the destination server calls the NFSv4.2 147 client to read the data to copy from the source server. 148 149 If unsure, say N. 150 151config NFSD_V4_SECURITY_LABEL 152 bool "Provide Security Label support for NFSv4 server" 153 depends on NFSD_V4 && SECURITY 154 help 155 156 Say Y here if you want enable fine-grained security label attribute 157 support for NFS version 4. Security labels allow security modules like 158 SELinux and Smack to label files to facilitate enforcement of their policies. 159 Without this an NFSv4 mount will have the same label on each file. 160 161 If you do not wish to enable fine-grained security labels SELinux or 162 Smack policies on NFSv4 files, say N. 163 164config NFSD_LEGACY_CLIENT_TRACKING 165 bool "Support legacy NFSv4 client tracking methods (DEPRECATED)" 166 depends on NFSD_V4 167 default y 168 help 169 The NFSv4 server needs to store a small amount of information on 170 stable storage in order to handle state recovery after reboot. Most 171 modern deployments upcall to a userland daemon for this (nfsdcld), 172 but older NFS servers may store information directly in a 173 recoverydir, or spawn a process directly using a usermodehelper 174 upcall. 175 176 These legacy client tracking methods have proven to be problematic 177 and will be removed in the future. Say Y here if you need support 178 for them in the interim. 179 180config NFSD_V4_DELEG_TIMESTAMPS 181 bool "Support delegated timestamps" 182 depends on NFSD_V4 183 default n 184 help 185 NFSD implements delegated timestamps according to 186 draft-ietf-nfsv4-delstid-08 "Extending the Opening of Files". This 187 is currently an experimental feature and is therefore left disabled 188 by default. 189