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TOMOYO Linux Cross Reference
Linux/fs/nfsd/Kconfig

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

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