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nfsd: allow disabling NFSv2 at compile time

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[ Upstream commit 2f3a4b2ac2 ]

rpc.nfsd stopped supporting NFSv2 a year ago. Take the next logical
step toward deprecating it and allow NFSv2 support to be compiled out.

Add a new CONFIG_NFSD_V2 option that can be turned off and rework the
CONFIG_NFSD_V?_ACL option dependencies. Add a description that
discourages enabling it.

Also, change the description of CONFIG_NFSD to state that the always-on
version is now 3 instead of 2.

Finally, add an #ifdef around "case 2:" in __write_versions. When NFSv2
is disabled at compile time, this should make the kernel ignore attempts
to disable it at runtime, but still error out when trying to enable it.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeff Layton 2022-10-18 07:47:56 -04:00 committed by Greg Kroah-Hartman
parent 850333a25a
commit f82865e2a0
5 changed files with 27 additions and 8 deletions
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19
fs/nfsd/Kconfig
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@ -8,6 +8,7 @@ config NFSD
select SUNRPC
select EXPORTFS
select NFS_ACL_SUPPORT if NFSD_V2_ACL
select NFS_ACL_SUPPORT if NFSD_V3_ACL
depends on MULTIUSER
help
Choose Y here if you want to allow other computers to access
@ -26,19 +27,29 @@ config NFSD
Below you can choose which versions of the NFS protocol are
available to clients mounting the NFS server on this system.
Support for NFS version 2 (RFC 1094) is always available when
Support for NFS version 3 (RFC 1813) is always available when
CONFIG_NFSD is selected.
If unsure, say N.
config NFSD_V2_ACL
bool
config NFSD_V2
bool "NFS server support for NFS version 2 (DEPRECATED)"
depends on NFSD
default n
help
NFSv2 (RFC 1094) was the first publicly-released version of NFS.
Unless you are hosting ancient (1990's era) NFS clients, you don't
need this.
If unsure, say N.
config NFSD_V2_ACL
bool "NFS server support for the NFSv2 ACL protocol extension"
depends on NFSD_V2
config NFSD_V3_ACL
bool "NFS server support for the NFSv3 ACL protocol extension"
depends on NFSD
select NFSD_V2_ACL
help
Solaris NFS servers support an auxiliary NFSv3 ACL protocol that
never became an official part of the NFS version 3 protocol.

5
fs/nfsd/Makefile
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@ -10,9 +10,10 @@ obj-$(CONFIG_NFSD) += nfsd.o
# this one should be compiled first, as the tracing macros can easily blow up
nfsd-y += trace.o
nfsd-y += nfssvc.o nfsctl.o nfsproc.o nfsfh.o vfs.o \
export.o auth.o lockd.o nfscache.o nfsxdr.o \
nfsd-y += nfssvc.o nfsctl.o nfsfh.o vfs.o \
export.o auth.o lockd.o nfscache.o \
stats.o filecache.o nfs3proc.o nfs3xdr.o
nfsd-$(CONFIG_NFSD_V2) += nfsproc.o nfsxdr.o
nfsd-$(CONFIG_NFSD_V2_ACL) += nfs2acl.o
nfsd-$(CONFIG_NFSD_V3_ACL) += nfs3acl.o
nfsd-$(CONFIG_NFSD_V4) += nfs4proc.o nfs4xdr.o nfs4state.o nfs4idmap.o \

2
fs/nfsd/nfsctl.c
View File

@ -581,7 +581,9 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
switch(num) {
#ifdef CONFIG_NFSD_V2
case 2:
#endif
case 3:
nfsd_vers(nn, num, cmd);
break;

3
fs/nfsd/nfsd.h
View File

@ -64,8 +64,7 @@ struct readdir_cd {
extern struct svc_program nfsd_program;
extern const struct svc_version nfsd_version2, nfsd_version3,
nfsd_version4;
extern const struct svc_version nfsd_version2, nfsd_version3, nfsd_version4;
extern struct mutex nfsd_mutex;
extern spinlock_t nfsd_drc_lock;
extern unsigned long nfsd_drc_max_mem;

6
fs/nfsd/nfssvc.c
View File

@ -91,8 +91,12 @@ unsigned long nfsd_drc_mem_used;
#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
static struct svc_stat nfsd_acl_svcstats;
static const struct svc_version *nfsd_acl_version[] = {
# if defined(CONFIG_NFSD_V2_ACL)
[2] = &nfsd_acl_version2,
# endif
# if defined(CONFIG_NFSD_V3_ACL)
[3] = &nfsd_acl_version3,
# endif
};
#define NFSD_ACL_MINVERS 2
@ -116,7 +120,9 @@ static struct svc_stat nfsd_acl_svcstats = {
#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
static const struct svc_version *nfsd_version[] = {
#if defined(CONFIG_NFSD_V2)
[2] = &nfsd_version2,
#endif
[3] = &nfsd_version3,
#if defined(CONFIG_NFSD_V4)
[4] = &nfsd_version4,