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knfsd: Support adding transports by writing portlist file

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Update the write handler for the portlist file to allow creating new
listening endpoints on a transport. The general form of the string is:

<transport_name><space><port number>

For example:

echo "tcp 2049" > /proc/fs/nfsd/portlist

This is intended to support the creation of a listening endpoint for
RDMA transports without adding #ifdef code to the nfssvc.c file.

Transports can also be removed as follows:

'-'<transport_name><space><port number>

For example:

echo "-tcp 2049" > /proc/fs/nfsd/portlist

Attempting to add a listener with an invalid transport string results
in EPROTONOSUPPORT and a perror string of "Protocol not supported".

Attempting to remove an non-existent listener (.e.g. bad proto or port)
results in ENOTCONN and a perror string of
"Transport endpoint is not connected"

Signed-off-by: Tom Tucker <[email protected]>
Acked-by: Neil Brown <[email protected]>
Reviewed-by: Chuck Lever <[email protected]>
Reviewed-by: Greg Banks <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
This commit is contained in:
Tom Tucker 2007-12-30 21:08:35 -06:00 • committed by J. Bruce Fields
commit a217813f90
3 changed files with 63 additions and 6 deletions
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18
fs/lockd/svc.c
View file

@ -227,17 +227,25 @@ lockd(struct svc_rqst *rqstp)
static int make_socks(struct svc_serv *serv, int proto)
{
static int warned;
struct svc_xprt *xprt;
int err = 0;
if (proto == IPPROTO_UDP || nlm_udpport)
if (!svc_find_xprt(serv, "udp", 0, 0))
if (proto == IPPROTO_UDP || nlm_udpport) {
xprt = svc_find_xprt(serv, "udp", 0, 0);
if (!xprt)
err = svc_create_xprt(serv, "udp", nlm_udpport,
SVC_SOCK_DEFAULTS);
if (err >= 0 && (proto == IPPROTO_TCP || nlm_tcpport))
if (!svc_find_xprt(serv, "tcp", 0, 0))
else
svc_xprt_put(xprt);
}
if (err >= 0 && (proto == IPPROTO_TCP || nlm_tcpport)) {
xprt = svc_find_xprt(serv, "tcp", 0, 0);
if (!xprt)
err = svc_create_xprt(serv, "tcp", nlm_tcpport,
SVC_SOCK_DEFAULTS);
else
svc_xprt_put(xprt);
}
if (err >= 0) {
warned = 0;
err = 0;