xref: /openbmc/linux/fs/nfs/Kconfig (revision 4f38b9f2) 
1config NFS_FS
2	tristate "NFS client support"
3	depends on INET && FILE_LOCKING && MULTIUSER
4	select LOCKD
5	select SUNRPC
6	select NFS_ACL_SUPPORT if NFS_V3_ACL
7	help
8	  Choose Y here if you want to access files residing on other
9	  computers using Sun's Network File System protocol.  To compile
10	  this file system support as a module, choose M here: the module
11	  will be called nfs.
12
13	  To mount file systems exported by NFS servers, you also need to
14	  install the user space mount.nfs command which can be found in
15	  the Linux nfs-utils package, available from http://linux-nfs.org/.
16	  Information about using the mount command is available in the
17	  mount(8) man page.  More detail about the Linux NFS client
18	  implementation is available via the nfs(5) man page.
19
20	  Below you can choose which versions of the NFS protocol are
21	  available in the kernel to mount NFS servers.  Support for NFS
22	  version 2 (RFC 1094) is always available when NFS_FS is selected.
23
24	  To configure a system which mounts its root file system via NFS
25	  at boot time, say Y here, select "Kernel level IP
26	  autoconfiguration" in the NETWORK menu, and select "Root file
27	  system on NFS" below.  You cannot compile this file system as a
28	  module in this case.
29
30	  If unsure, say N.
31
32config NFS_V2
33	tristate "NFS client support for NFS version 2"
34	depends on NFS_FS
35	default y
36	help
37	  This option enables support for version 2 of the NFS protocol
38	  (RFC 1094) in the kernel's NFS client.
39
40	  If unsure, say Y.
41
42config NFS_V3
43	tristate "NFS client support for NFS version 3"
44	depends on NFS_FS
45	default y
46	help
47	  This option enables support for version 3 of the NFS protocol
48	  (RFC 1813) in the kernel's NFS client.
49
50	  If unsure, say Y.
51
52config NFS_V3_ACL
53	bool "NFS client support for the NFSv3 ACL protocol extension"
54	depends on NFS_V3
55	help
56	  Some NFS servers support an auxiliary NFSv3 ACL protocol that
57	  Sun added to Solaris but never became an official part of the
58	  NFS version 3 protocol.  This protocol extension allows
59	  applications on NFS clients to manipulate POSIX Access Control
60	  Lists on files residing on NFS servers.  NFS servers enforce
61	  ACLs on local files whether this protocol is available or not.
62
63	  Choose Y here if your NFS server supports the Solaris NFSv3 ACL
64	  protocol extension and you want your NFS client to allow
65	  applications to access and modify ACLs on files on the server.
66
67	  Most NFS servers don't support the Solaris NFSv3 ACL protocol
68	  extension.  You can choose N here or specify the "noacl" mount
69	  option to prevent your NFS client from trying to use the NFSv3
70	  ACL protocol.
71
72	  If unsure, say N.
73
74config NFS_V4
75	tristate "NFS client support for NFS version 4"
76	depends on NFS_FS
77	select SUNRPC_GSS
78	select KEYS
79	help
80	  This option enables support for version 4 of the NFS protocol
81	  (RFC 3530) in the kernel's NFS client.
82
83	  To mount NFS servers using NFSv4, you also need to install user
84	  space programs which can be found in the Linux nfs-utils package,
85	  available from http://linux-nfs.org/.
86
87	  If unsure, say Y.
88
89config NFS_SWAP
90	bool "Provide swap over NFS support"
91	default n
92	depends on NFS_FS
93	select SUNRPC_SWAP
94	help
95	  This option enables swapon to work on files located on NFS mounts.
96
97config NFS_V4_1
98	bool "NFS client support for NFSv4.1"
99	depends on NFS_V4
100	select SUNRPC_BACKCHANNEL
101	help
102	  This option enables support for minor version 1 of the NFSv4 protocol
103	  (RFC 5661) in the kernel's NFS client.
104
105	  If unsure, say N.
106
107config NFS_V4_2
108	bool "NFS client support for NFSv4.2"
109	depends on NFS_V4_1
110	help
111	  This option enables support for minor version 2 of the NFSv4 protocol
112	  in the kernel's NFS client.
113
114	  If unsure, say N.
115
116config PNFS_FILE_LAYOUT
117	tristate
118	depends on NFS_V4_1
119	default NFS_V4
120
121config PNFS_BLOCK
122	tristate
123	depends on NFS_V4_1 && BLK_DEV_DM
124	default NFS_V4
125
126config PNFS_OBJLAYOUT
127	tristate
128	depends on NFS_V4_1 && SCSI_OSD_ULD
129	default NFS_V4
130
131config PNFS_FLEXFILE_LAYOUT
132	tristate
133	depends on NFS_V4_1 && NFS_V3
134	default m
135
136config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
137	string "NFSv4.1 Implementation ID Domain"
138	depends on NFS_V4_1
139	default "kernel.org"
140	help
141	  This option defines the domain portion of the implementation ID that
142	  may be sent in the NFS exchange_id operation.  The value must be in
143	  the format of a DNS domain name and should be set to the DNS domain
144	  name of the distribution.
145	  If the NFS client is unchanged from the upstream kernel, this
146	  option should be set to the default "kernel.org".
147
148config NFS_V4_1_MIGRATION
149	bool "NFSv4.1 client support for migration"
150	depends on NFS_V4_1
151	default n
152	help
153	  This option makes the NFS client advertise to NFSv4.1 servers that
154          it can support NFSv4 migration.
155
156          The NFSv4.1 pieces of the Linux NFSv4 migration implementation are
157          still experimental.  If you are not an NFSv4 developer, say N here.
158
159config NFS_V4_SECURITY_LABEL
160	bool
161	depends on NFS_V4_2 && SECURITY
162	default y
163
164config ROOT_NFS
165	bool "Root file system on NFS"
166	depends on NFS_FS=y && IP_PNP
167	help
168	  If you want your system to mount its root file system via NFS,
169	  choose Y here.  This is common practice for managing systems
170	  without local permanent storage.  For details, read
171	  <file:Documentation/filesystems/nfs/nfsroot.txt>.
172
173	  Most people say N here.
174
175config NFS_FSCACHE
176	bool "Provide NFS client caching support"
177	depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
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	select CRC32
202	default y
203