sunrpc: Change rpc_print_iostats to rpc_clnt_show_stats and handle rpc_clnt clones

The existing rpc_print_iostats has a few shortcomings.  First, the naming
is not consistent with other functions in the kernel that display stats.
Second, it is really displaying stats for an rpc_clnt structure as it
displays both xprt stats and per-op stats.  Third, it does not handle
rpc_clnt clones, which is important for the one in-kernel tree caller
of this function, the NFS client's nfs_show_stats function.

Fix all of the above by renaming the rpc_print_iostats to
rpc_clnt_show_stats and looping through any rpc_clnt clones via
cl_parent.

Once this interface is fixed, this addresses a problem with NFSv4.
Before this patch, the /proc/self/mountstats always showed incorrect
counts for NFSv4 lease and session related opcodes such as SEQUENCE,
RENEW, SETCLIENTID, CREATE_SESSION, etc.  These counts were always 0
even though many ops would go over the wire.  The reason for this is
there are multiple rpc_clnt structures allocated for any given NFSv4
mount, and inside nfs_show_stats() we callled into rpc_print_iostats()
which only handled one of them, nfs_server->client.  Fix these counts
by calling sunrpc's new rpc_clnt_show_stats() function, which handles
cloned rpc_clnt structs and prints the stats together.

Note that one side-effect of the above is that multiple mounts from
the same NFS server will show identical counts in the above ops due
to the fact the one rpc_clnt (representing the NFSv4 client state)
is shared across mounts.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/net/sunrpc/stats.c b/net/sunrpc/stats.c
index 32adddd7fb78..ffae7c2245b1 100644
--- a/net/sunrpc/stats.c
+++ b/net/sunrpc/stats.c
@@ -235,13 +235,12 @@ static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
                    ktime_to_ms(stats->om_execute));
 }
 
-void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
+void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
 {
-        struct rpc_iostats *stats = clnt->cl_metrics;
         struct rpc_xprt *xprt;
         unsigned int op, maxproc = clnt->cl_maxproc;
 
-        if (!stats)
+        if (!clnt->cl_metrics)
                 return;
 
         seq_printf(seq, "\tRPC iostats version: %s  ", RPC_IOSTATS_VERS);
@@ -256,10 +255,18 @@ void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
 
         seq_printf(seq, "\tper-op statistics\n");
         for (op = 0; op < maxproc; op++) {
-                _print_rpc_iostats(seq, &stats[op], op, clnt->cl_procinfo);
+                struct rpc_iostats stats = {};
+                struct rpc_clnt *next = clnt;
+                do {
+                        _add_rpc_iostats(&stats, &next->cl_metrics[op]);
+                        if (next == next->cl_parent)
+                                break;
+                        next = next->cl_parent;
+                } while (next);
+                _print_rpc_iostats(seq, &stats, op, clnt->cl_procinfo);
         }
 }
-EXPORT_SYMBOL_GPL(rpc_print_iostats);
+EXPORT_SYMBOL_GPL(rpc_clnt_show_stats);
 
 /*
  * Register/unregister RPC proc files