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NFSD: Create PF_INET6 listener in write_ports

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Try to create a PF_INET6 listener for NFSD, if IPv6 is enabled in the
kernel.

Make sure nfsd_serv's reference count is decreased if
__write_ports_addxprt() failed to create a listener.  See
__write_ports_addfd().

Our current plan is to rely on rpc.nfsd to create appropriate IPv6
listeners when server-side NFS/IPv6 support is desired.  Legacy
behavior, via the write_threads or write_svc kernel APIs, will remain
the same -- only IPv4 listeners are created.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[bfields@citi.umich.edu: Move error-handling code to end]
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Chuck Lever 2010-01-26 14:04:22 -05:00 committed by J. Bruce Fields
parent 6871790815
commit 37498292aa
1 changed files with 17 additions and 1 deletions
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18
fs/nfsd/nfsctl.c
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@ -988,6 +988,7 @@ static ssize_t __write_ports_delfd(char *buf)
static ssize_t __write_ports_addxprt(char *buf)
{
char transport[16];
struct svc_xprt *xprt;
int port, err;
if (sscanf(buf, "%15s %4u", transport, &port) != 2)
@ -1003,8 +1004,23 @@ static ssize_t __write_ports_addxprt(char *buf)
err = svc_create_xprt(nfsd_serv, transport,
PF_INET, port, SVC_SOCK_ANONYMOUS);
if (err < 0)
return err;
goto out_err;
err = svc_create_xprt(nfsd_serv, transport,
PF_INET6, port, SVC_SOCK_ANONYMOUS);
if (err < 0 && err != -EAFNOSUPPORT)
goto out_close;
return 0;
out_close:
xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
if (xprt != NULL) {
svc_close_xprt(xprt);
svc_xprt_put(xprt);
}
out_err:
/* Decrease the count, but don't shut down the service */
nfsd_serv->sv_nrthreads--;
return err;
}
/*