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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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2
net/sunrpc/svc_xprt.c
View file

@ -842,6 +842,7 @@ void svc_close_xprt(struct svc_xprt *xprt)
clear_bit(XPT_BUSY, &xprt->xpt_flags);
svc_xprt_put(xprt);
}
EXPORT_SYMBOL_GPL(svc_close_xprt);
void svc_close_all(struct list_head *xprt_list)
{
@ -1006,6 +1007,7 @@ struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
if (port && port != svc_xprt_local_port(xprt))
continue;
found = xprt;
svc_xprt_get(xprt);
break;
}
spin_unlock_bh(&serv->sv_lock);