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

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