Clean up: I'd like to refactor __write_ports() to make it easier to
understand and maintain. Introduce a set of helper functions to
handle the details of the __write_ports() function.
New helpers are not used yet.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfsd/nfsctl.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 110 insertions(+), 0 deletions(-)
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 5c75f8a..0e64d92 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -879,6 +879,116 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size)
return rv;
}
+/*
+ * Zero-length write. Return a list of NFSD's current listener
+ * transports.
+ */
+static ssize_t __write_ports_names(char *buf, size_t size)
+{
+ if (!nfsd_serv)
+ return 0;
+ return svc_xprt_names(nfsd_serv, buf, 0);
+}
+
+/*
+ * A single 'fd' number was written, in which case it must be for
+ * a socket of a supported family/protocol, and we use it as an
+ * nfsd listener.
+ */
+static ssize_t __write_ports_addfd(char *buf, size_t size)
+{
+ char *mesg = buf;
+ int fd, err;
+
+ err = get_int(&mesg, &fd);
+ if (err || fd < 0)
+ return -EINVAL;
+
+ err = nfsd_create_serv();
+ if (err)
+ return err;
+
+ err = svc_addsock(nfsd_serv, fd, buf);
+ if (err < 0)
+ return err;
+
+ err = lockd_up();
+ if (err < 0)
+ svc_sock_names(buf + strlen(buf) + 1, nfsd_serv, buf);
+
+ /* Decrease the count, but don't shut down the the service */
+ nfsd_serv->sv_nrthreads--;
+
+ return err < 0 ? err : 0;
+}
+
+/*
+ * A '-' followed by the 'name' of a socket means we close the socket.
+ */
+static ssize_t __write_ports_delfd(char *buf, size_t size)
+{
+ char *toclose;
+ int len = 0;
+
+ toclose = kstrdup(buf + 1, GFP_KERNEL);
+ if (!toclose)
+ return -ENOMEM;
+
+ if (nfsd_serv)
+ len = svc_sock_names(buf, nfsd_serv, toclose);
+ if (len >= 0)
+ lockd_down();
+
+ kfree(toclose);
+ return len;
+}
+
+/*
+ * A transport listener is added by writing it's transport name and
+ * a port number
+ */
+static ssize_t __write_ports_addxprt(char *buf, size_t size,
+ char *transport, unsigned short port)
+{
+ int err;
+
+ err = nfsd_create_serv();
+ if (err)
+ return err;
+
+ 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;
+}
+
+/*
+ * A transport listener is removed by writing a "-", it's transport
+ * name, and it's port number
+ */
+static ssize_t __write_ports_delxprt(char *buf, size_t size,
+ char *transport, int port)
+{
+ struct svc_xprt *xprt;
+ int err = -EINVAL;
+
+ if (port == 0 || nfsd_serv == NULL)
+ return err;
+
+ xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
+ if (xprt) {
+ svc_close_xprt(xprt);
+ svc_xprt_put(xprt);
+ err = 0;
+ } else
+ err = -ENOTCONN;
+
+ return err < 0 ? err : 0;
+}
+
static ssize_t __write_ports(struct file *file, char *buf, size_t size)
{
if (size == 0) {
--
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