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-rw-r--r--fs/nfsd/stats.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c
new file mode 100644
index 000000000..777e24e5d
--- /dev/null
+++ b/fs/nfsd/stats.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * procfs-based user access to knfsd statistics
+ *
+ * /proc/net/rpc/nfsd
+ *
+ * Format:
+ * rc <hits> <misses> <nocache>
+ * Statistsics for the reply cache
+ * fh <stale> <deprecated filehandle cache stats>
+ * statistics for filehandle lookup
+ * io <bytes-read> <bytes-written>
+ * statistics for IO throughput
+ * th <threads> <deprecated thread usage histogram stats>
+ * number of threads
+ * ra <deprecated ra-cache stats>
+ *
+ * plus generic RPC stats (see net/sunrpc/stats.c)
+ *
+ * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <linux/sunrpc/stats.h>
+#include <net/net_namespace.h>
+
+#include "nfsd.h"
+
+struct nfsd_stats nfsdstats;
+struct svc_stat nfsd_svcstats = {
+ .program = &nfsd_program,
+};
+
+static int nfsd_show(struct seq_file *seq, void *v)
+{
+ int i;
+
+ seq_printf(seq, "rc %lld %lld %lld\nfh %lld 0 0 0 0\nio %lld %lld\n",
+ percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_HITS]),
+ percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_MISSES]),
+ percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_NOCACHE]),
+ percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_FH_STALE]),
+ percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_READ]),
+ percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_WRITE]));
+
+ /* thread usage: */
+ seq_printf(seq, "th %u 0", atomic_read(&nfsdstats.th_cnt));
+
+ /* deprecated thread usage histogram stats */
+ for (i = 0; i < 10; i++)
+ seq_puts(seq, " 0.000");
+
+ /* deprecated ra-cache stats */
+ seq_puts(seq, "\nra 0 0 0 0 0 0 0 0 0 0 0 0\n");
+
+ /* show my rpc info */
+ svc_seq_show(seq, &nfsd_svcstats);
+
+#ifdef CONFIG_NFSD_V4
+ /* Show count for individual nfsv4 operations */
+ /* Writing operation numbers 0 1 2 also for maintaining uniformity */
+ seq_printf(seq,"proc4ops %u", LAST_NFS4_OP + 1);
+ for (i = 0; i <= LAST_NFS4_OP; i++) {
+ seq_printf(seq, " %lld",
+ percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_NFS4_OP(i)]));
+ }
+
+ seq_putc(seq, '\n');
+#endif
+
+ return 0;
+}
+
+DEFINE_PROC_SHOW_ATTRIBUTE(nfsd);
+
+int nfsd_percpu_counters_init(struct percpu_counter counters[], int num)
+{
+ int i, err = 0;
+
+ for (i = 0; !err && i < num; i++)
+ err = percpu_counter_init(&counters[i], 0, GFP_KERNEL);
+
+ if (!err)
+ return 0;
+
+ for (; i > 0; i--)
+ percpu_counter_destroy(&counters[i-1]);
+
+ return err;
+}
+
+void nfsd_percpu_counters_reset(struct percpu_counter counters[], int num)
+{
+ int i;
+
+ for (i = 0; i < num; i++)
+ percpu_counter_set(&counters[i], 0);
+}
+
+void nfsd_percpu_counters_destroy(struct percpu_counter counters[], int num)
+{
+ int i;
+
+ for (i = 0; i < num; i++)
+ percpu_counter_destroy(&counters[i]);
+}
+
+static int nfsd_stat_counters_init(void)
+{
+ return nfsd_percpu_counters_init(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
+}
+
+static void nfsd_stat_counters_destroy(void)
+{
+ nfsd_percpu_counters_destroy(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
+}
+
+int nfsd_stat_init(void)
+{
+ int err;
+
+ err = nfsd_stat_counters_init();
+ if (err)
+ return err;
+
+ svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_ops);
+
+ return 0;
+}
+
+void nfsd_stat_shutdown(void)
+{
+ nfsd_stat_counters_destroy();
+ svc_proc_unregister(&init_net, "nfsd");
+}