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 CRYPTO_LIB_MD5 if NFSD_LEGACY_CLIENT_TRACKING 9 select CRYPTO_LIB_SHA256 if NFSD_V4 10 select CRYPTO # required by RPCSEC_GSS_KRB5 and signed filehandles 11 select LOCKD 12 select SUNRPC 13 select EXPORTFS 14 select NFS_COMMON 15 select NFS_ACL_SUPPORT if NFSD_V2_ACL 16 select NFS_ACL_SUPPORT if NFSD_V3_ACL 17 depends on MULTIUSER 18 help 19 Choose Y here if you want to allow other computers to access 20 files residing on this system using Sun's Network File System 21 protocol. To compile the NFS server support as a module, 22 choose M here: the module will be called nfsd. 23 24 You may choose to use a user-space NFS server instead, in which 25 case you can choose N here. 26 27 To export local file systems using NFS, you also need to install 28 user space programs which can be found in the Linux nfs-utils 29 package, available from http://linux-nfs.org/. More detail about 30 the Linux NFS server implementation is available via the 31 exports(5) man page. 32 33 Below you can choose which versions of the NFS protocol are 34 available to clients mounting the NFS server on this system. 35 Support for NFS version 3 (RFC 1813) is always available when 36 CONFIG_NFSD is selected. 37 38 If unsure, say N. 39 40config NFSD_V2 41 bool "NFS server support for NFS version 2 (DEPRECATED)" 42 depends on NFSD 43 default n 44 help 45 NFSv2 (RFC 1094) was the first publicly-released version of NFS. 46 Unless you are hosting ancient (1990's era) NFS clients, you don't 47 need this. 48 49 If unsure, say N. 50 51config NFSD_V2_ACL 52 bool "NFS server support for the NFSv2 ACL protocol extension" 53 depends on NFSD_V2 54 55config NFSD_V3_ACL 56 bool "NFS server support for the NFSv3 ACL protocol extension" 57 depends on NFSD 58 help 59 Solaris NFS servers support an auxiliary NFSv3 ACL protocol that 60 never became an official part of the NFS version 3 protocol. 61 This protocol extension allows applications on NFS clients to 62 manipulate POSIX Access Control Lists on files residing on NFS 63 servers. NFS servers enforce POSIX ACLs on local files whether 64 this protocol is available or not. 65 66 This option enables support in your system's NFS server for the 67 NFSv3 ACL protocol extension allowing NFS clients to manipulate 68 POSIX ACLs on files exported by your system's NFS server. NFS 69 clients which support the Solaris NFSv3 ACL protocol can then 70 access and modify ACLs on your NFS server. 71 72 To store ACLs on your NFS server, you also need to enable ACL- 73 related CONFIG options for your local file systems of choice. 74 75 If unsure, say N. 76 77config NFSD_V4 78 bool "NFS server support for NFS version 4" 79 depends on NFSD && PROC_FS 80 select FS_POSIX_ACL 81 select RPCSEC_GSS_KRB5 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 n 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_POSIX_ACLS 181 bool "Support NFSv4 POSIX draft ACLs" 182 depends on NFSD_V4 183 default n 184 help 185 Include experimental support for POSIX Access Control Lists 186 (ACLs) in NFSv4 as specified in the IETF draft 187 draft-ietf-nfsv4-posix-acls. This protocol extension enables 188 NFSv4 clients to retrieve and modify POSIX ACLs on exported 189 filesystems that support them. 190 191 This feature is based on an unratified IETF draft 192 specification that may change in ways that impact 193 interoperability with existing clients. Enable only for 194 testing environments or when interoperability with specific 195 clients that implement this draft is required. 196 197 If unsure, say N. 198