On Oct 28, 2009, at 3:40 PM, Jeff Layton wrote:
Solaris uses netids as values for the proto= option, so that when
someone specifies "tcp6" they get traffic over TCP + IPv6. Until
recently, this has never really been an issue for Linux since it
didn't
support NFS over IPv6. The netid and the protocol name were generally
always the same (modulo any strange configuration in /etc/netconfig).
The solaris manpage documents their proto= option as:
proto= _netid_ | rdma
This patch is intended to bring Linux closer to how the Solaris proto=
option works, by declaring a static netid mapping in the kernel and
converting the proto= and mountproto= options to follow it and display
the proper values in /proc/mounts.
Much of this functionality will need to be provided by a userspace
mount.nfs patch. Chuck Lever has a draft patch to change mount.nfs in
the same way. In principle, we could do *all* of this in userspace but
for the fact that the mount options in /proc/mounts would no longer
reflect the options passed to mount.nfs.
The alternative to the static mapping here is to add a mechanism to
upcall to userspace for netid's. I'm not opposed to that option, but
it'll probably mean a bit more overhead (and quite a bit more code).
Rather than shoot for that at first, I figured it was probably
better to
start simply.
Comments welcome...
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/nfs/super.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++
+--------
1 files changed, 81 insertions(+), 13 deletions(-)
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 90be551..e63b8f4 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -175,14 +175,16 @@ static const match_table_t
nfs_mount_option_tokens = {
};
enum {
- Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
+ Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6,
Opt_xprt_rdma,
Opt_xprt_err
};
static const match_table_t nfs_xprt_protocol_tokens = {
{ Opt_xprt_udp, "udp" },
+ { Opt_xprt_udp6, "udp6" },
{ Opt_xprt_tcp, "tcp" },
+ { Opt_xprt_tcp6, "tcp6" },
{ Opt_xprt_rdma, "rdma" },
{ Opt_xprt_err, NULL }
@@ -492,6 +494,45 @@ static const char
*nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
return sec_flavours[i].str;
}
+static void nfs_show_mountd_netid(struct seq_file *m, struct
nfs_server *nfss,
+ int showdefaults)
+{
+ struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
+
+ seq_printf(m, ",mountproto=");
+ switch (sap->sa_family) {
+ case AF_INET:
+ switch (nfss->mountd_protocol) {
+ case IPPROTO_UDP:
+ seq_printf(m, RPCBIND_NETID_UDP);
+ break;
+ case IPPROTO_TCP:
+ seq_printf(m, RPCBIND_NETID_TCP);
+ break;
+ default:
+ if (showdefaults)
+ seq_printf(m, "auto");
+ }
+ break;
+ case AF_INET6:
+ switch (nfss->mountd_protocol) {
+ case IPPROTO_UDP:
+ seq_printf(m, RPCBIND_NETID_UDP6);
+ break;
+ case IPPROTO_TCP:
+ seq_printf(m, RPCBIND_NETID_TCP6);
+ break;
+ default:
+ if (showdefaults)
+ seq_printf(m, "auto");
+ }
+ break;
+ default:
+ if (showdefaults)
+ seq_printf(m, "auto");
+ }
+}
+
static void nfs_show_mountd_options(struct seq_file *m, struct
nfs_server *nfss,
int showdefaults)
{
@@ -518,17 +559,7 @@ static void nfs_show_mountd_options(struct
seq_file *m, struct nfs_server *nfss,
if (nfss->mountd_port || showdefaults)
seq_printf(m, ",mountport=%u", nfss->mountd_port);
- switch (nfss->mountd_protocol) {
- case IPPROTO_UDP:
- seq_printf(m, ",mountproto=udp");
- break;
- case IPPROTO_TCP:
- seq_printf(m, ",mountproto=tcp");
- break;
- default:
- if (showdefaults)
- seq_printf(m, ",mountproto=auto");
- }
+ nfs_show_mountd_netid(m, nfss, showdefaults);
}
/*
@@ -578,7 +609,7 @@ static void nfs_show_mount_options(struct
seq_file *m, struct nfs_server *nfss,
seq_puts(m, nfs_infop->nostr);
}
seq_printf(m, ",proto=%s",
- rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
+ rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
Does that do the right thing for rdma mounts, currently?
if (version == 4) {
if (nfss->port != NFS_PORT)
seq_printf(m, ",port=%u", nfss->port);
@@ -887,6 +918,8 @@ static int nfs_parse_mount_options(char *raw,
{
char *p, *string, *secdata;
int rc, sloppy = 0, invalid_option = 0;
+ unsigned short protofamily = AF_UNSPEC;
+ unsigned short mountfamily = AF_UNSPEC;
if (!raw) {
dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
@@ -1232,12 +1265,17 @@ static int nfs_parse_mount_options(char *raw,
token = match_token(string,
nfs_xprt_protocol_tokens, args);
+ protofamily = AF_INET;
switch (token) {
+ case Opt_xprt_udp6:
+ protofamily = AF_INET6;
case Opt_xprt_udp:
mnt->flags &= ~NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
kfree(string);
break;
+ case Opt_xprt_tcp6:
+ protofamily = AF_INET6;
case Opt_xprt_tcp:
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
@@ -1265,10 +1303,15 @@ static int nfs_parse_mount_options(char *raw,
nfs_xprt_protocol_tokens, args);
kfree(string);
+ mountfamily = AF_INET;
switch (token) {
+ case Opt_xprt_udp6:
+ mountfamily = AF_INET6;
case Opt_xprt_udp:
mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
+ case Opt_xprt_tcp6:
+ mountfamily = AF_INET6;
case Opt_xprt_tcp:
mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
break;
@@ -1367,8 +1410,33 @@ static int nfs_parse_mount_options(char *raw,
if (!sloppy && invalid_option)
return 0;
+ /*
+ * verify that any proto=/mountproto= options match the address
+ * familiies in the addr=/mountaddr= options.
+ */
+ if (protofamily != AF_UNSPEC &&
+ protofamily != mnt->nfs_server.address.ss_family)
+ goto out_proto_mismatch;
+
+ if (mountfamily != AF_UNSPEC) {
+ if (mnt->mount_server.addrlen) {
+ if (mountfamily != mnt->mount_server.address.ss_family)
+ goto out_mountproto_mismatch;
+ } else {
+ if (mountfamily != mnt->nfs_server.address.ss_family)
+ goto out_mountproto_mismatch;
+ }
+ }
+
return 1;
+out_mountproto_mismatch:
+ printk(KERN_INFO "NFS: mount server address does not match
mountproto= "
+ "option\n");
+ return 0;
+out_proto_mismatch:
+ printk(KERN_INFO "NFS: server address does not match proto= option
\n");
+ return 0;
out_invalid_address:
printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
return 0;
--
1.6.0.6
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--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com
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