NFSD: Refactor socket creation out of __write_ports()

Clean up: Refactor the socket creation logic out of __write_ports() to
make it easier to understand and maintain.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 34 insertions, 30 deletions

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index fa268d1b775f..b6a847faa0bb 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -911,6 +911,37 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size)
 }
 
 /*
+ * 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)
+{
+        char *mesg = buf;
+        int fd, err;
+
+        err = get_int(&mesg, &fd);
+        if (err != 0 || fd < 0)
+                return -EINVAL;
+
+        err = nfsd_create_serv();
+        if (err != 0)
+                return err;
+
+        err = svc_addsock(nfsd_serv, fd, buf);
+        if (err >= 0) {
+                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 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)
@@ -995,36 +1026,9 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
                         len = svc_xprt_names(nfsd_serv, buf, 0);
                 return len;
         }
-        /* Either a single 'fd' number is written, in which
-         * case it must be for a socket of a supported family/protocol,
-         * and we use it as an nfsd socket, or
-         * A '-' followed by the 'name' of a socket in which case
-         * we close the socket.
-         */
-        if (isdigit(buf[0])) {
-                char *mesg = buf;
-                int fd;
-                int err;
-                err = get_int(&mesg, &fd);
-                if (err)
-                        return -EINVAL;
-                if (fd < 0)
-                        return -EINVAL;
-                err = nfsd_create_serv();
-                if (!err) {
-                        err = svc_addsock(nfsd_serv, fd, buf);
-                        if (err >= 0) {
-                                err = lockd_up();
-                                if (err < 0)
-                                        svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
-                        }
-                        /* Decrease the count, but don't shutdown the
-                         * the service
-                         */
-                        nfsd_serv->sv_nrthreads--;
-                }
-                return err < 0 ? err : 0;
-        }
+
+        if (isdigit(buf[0]))
+                return __write_ports_addfd(buf);
 
         if (buf[0] == '-' && isdigit(buf[1]))
                 return __write_ports_delfd(buf);