On Fri, 2007-12-14 at 18:51 -0500, J. Bruce Fields wrote:
> On Tue, Dec 11, 2007 at 05:33:16PM -0600, Tom Tucker wrote:
> >
> > 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]>
> > ---
> >
> > fs/nfsd/nfsctl.c | 52
> > ++++++++++++++++++++++++++++++++++++++++++++++++-
> > net/sunrpc/svc_xprt.c | 1 +
> > 2 files changed, 52 insertions(+), 1 deletions(-)
> >
> > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> > index 77dc989..5b9ed0e 100644
> > --- a/fs/nfsd/nfsctl.c
> > +++ b/fs/nfsd/nfsctl.c
> > @@ -540,7 +540,7 @@ static ssize_t write_ports(struct file *file, char
> > *buf, size_t size)
> > }
> > return err < 0 ? err : 0;
> > }
> > - if (buf[0] == '-') {
> > + if (buf[0] == '-' && isdigit(buf[1])) {
> > char *toclose = kstrdup(buf+1, GFP_KERNEL);
> > int len = 0;
> > if (!toclose)
> > @@ -554,6 +554,56 @@ static ssize_t write_ports(struct file *file, char
> > *buf, size_t size)
> > kfree(toclose);
> > return len;
> > }
> > + /*
> > + * Add a transport listener by writing it's transport name
> > + */
> > + if (isalpha(buf[0])) {
> > + int err;
> > + char transport[16];
> > + int port;
> > + if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
> > + err = nfsd_create_serv();
> > + if (!err) {
> > + if (svc_find_xprt(nfsd_serv, transport,
> > + AF_UNSPEC, port))
> > + return -EADDRINUSE;
>
> Shouldn't svc_create_xprt do this check for us itself? (And if it
> doesn't, isn't there some minor race between two writers both checking,
> finding nothing, and then both svc_create_xprt()ing?)
>
You're right. fixed.
> > +
> > + err = svc_create_xprt(nfsd_serv,
> > + transport, port,
> > + SVC_SOCK_ANONYMOUS);
> > + if (err == -ENOENT)
> > + /* Give a reasonable perror msg for
> > + * bad transport string */
> > + err = -EPROTONOSUPPORT;
> > + }
> > + return err < 0 ? err : 0;
> > + }
> > + }
> > + /*
> > + * Remove a transport by writing it's transport name and port number
> > + */
> > + if (buf[0] == '-' && isalpha(buf[1])) {
> > + struct svc_xprt *xprt;
> > + int err = -EINVAL;
> > + char transport[16];
> > + int port;
> > + if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
> > + if (port == 0)
> > + return -EINVAL;
> > + lock_kernel();
> > + if (nfsd_serv) {
> > + xprt = svc_find_xprt(nfsd_serv, transport,
> > + AF_UNSPEC, port);
> > + if (xprt) {
> > + svc_close_xprt(xprt);
> > + err = 0;
>
> Hm, also: I'd have thought that svc_find_xprt should be incrementing the
> reference count on the returned xprt, if we're expecting the caller to
> do anything with it other than check it against NULL.
>
> --b.
>
>
> > + } else
> > + err = -ENOTCONN;
> > + }
> > + unlock_kernel();
> > + return err < 0 ? err : 0;
> > + }
> > + }
> > return -EINVAL;
> > }
> >
> > diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
> > index 9815c6f..6708aa2 100644
> > --- a/net/sunrpc/svc_xprt.c
> > +++ b/net/sunrpc/svc_xprt.c
> > @@ -827,6 +827,7 @@ 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)
> > {
> -
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