svc: Add svc_xprt_names service to replace svc_sock_names

Create a transport independent version of the svc_sock_names function.

The toclose capability of the svc_sock_names service can be implemented
using the svc_xprt_find and svc_xprt_close services.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

3 files changed, 37 insertions, 1 deletions

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index eff6a6b4c2f6..bc22e0b0343a 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -503,7 +503,7 @@ static ssize_t write_ports(struct file *file, char *buf, size_t size)
                 int len = 0;
                 lock_kernel();
                 if (nfsd_serv)
-                        len = svc_sock_names(buf, nfsd_serv, NULL);
+                        len = svc_xprt_names(nfsd_serv, buf, 0);
                 unlock_kernel();
                 return len;
         }
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 68862d51bb36..6fd7b016517f 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -81,6 +81,7 @@ void	svc_delete_xprt(struct svc_xprt *xprt);
 int     svc_port_is_privileged(struct sockaddr *sin);
 int     svc_print_xprts(char *buf, int maxlen);
 struct  svc_xprt *svc_find_xprt(struct svc_serv *, char *, int, int);
+int     svc_xprt_names(struct svc_serv *serv, char *buf, int buflen);
 
 static inline void svc_xprt_get(struct svc_xprt *xprt)
 {
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 783597343877..c3fb36784f3b 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -1014,3 +1014,38 @@ struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
         return found;
 }
 EXPORT_SYMBOL_GPL(svc_find_xprt);
+
+/*
+ * Format a buffer with a list of the active transports. A zero for
+ * the buflen parameter disables target buffer overflow checking.
+ */
+int svc_xprt_names(struct svc_serv *serv, char *buf, int buflen)
+{
+        struct svc_xprt *xprt;
+        char xprt_str[64];
+        int totlen = 0;
+        int len;
+
+        /* Sanity check args */
+        if (!serv)
+                return 0;
+
+        spin_lock_bh(&serv->sv_lock);
+        list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
+                len = snprintf(xprt_str, sizeof(xprt_str),
+                               "%s %d\n", xprt->xpt_class->xcl_name,
+                               svc_xprt_local_port(xprt));
+                /* If the string was truncated, replace with error string */
+                if (len >= sizeof(xprt_str))
+                        strcpy(xprt_str, "name-too-long\n");
+                /* Don't overflow buffer */
+                len = strlen(xprt_str);
+                if (buflen && (len + totlen >= buflen))
+                        break;
+                strcpy(buf+totlen, xprt_str);
+                totlen += len;
+        }
+        spin_unlock_bh(&serv->sv_lock);
+        return totlen;
+}
+EXPORT_SYMBOL_GPL(svc_xprt_names);