// SPDX-License-Identifier: GPL-2.0-or-later
/* FS-Cache statistics
 *
 * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#define FSCACHE_DEBUG_LEVEL CACHE
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include "internal.h"

/*
 * operation counters
 */
atomic_t fscache_n_volumes;
atomic_t fscache_n_volumes_collision;
atomic_t fscache_n_volumes_nomem;
atomic_t fscache_n_cookies;
atomic_t fscache_n_cookies_lru;
atomic_t fscache_n_cookies_lru_expired;
atomic_t fscache_n_cookies_lru_removed;
atomic_t fscache_n_cookies_lru_dropped;

atomic_t fscache_n_acquires;
atomic_t fscache_n_acquires_ok;
atomic_t fscache_n_acquires_oom;

atomic_t fscache_n_invalidates;

atomic_t fscache_n_updates;
EXPORT_SYMBOL(fscache_n_updates);

atomic_t fscache_n_relinquishes;
atomic_t fscache_n_relinquishes_retire;
atomic_t fscache_n_relinquishes_dropped;

atomic_t fscache_n_resizes;
atomic_t fscache_n_resizes_null;

atomic_t fscache_n_read;
EXPORT_SYMBOL(fscache_n_read);
atomic_t fscache_n_write;
EXPORT_SYMBOL(fscache_n_write);
atomic_t fscache_n_no_write_space;
EXPORT_SYMBOL(fscache_n_no_write_space);
atomic_t fscache_n_no_create_space;
EXPORT_SYMBOL(fscache_n_no_create_space);
atomic_t fscache_n_culled;
EXPORT_SYMBOL(fscache_n_culled);
atomic_t fscache_n_dio_misfit;
EXPORT_SYMBOL(fscache_n_dio_misfit);

/*
 * display the general statistics
 */
int fscache_stats_show(struct seq_file *m)
{
        seq_puts(m, "-- FS-Cache statistics --\n");
        seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
                   atomic_read(&fscache_n_cookies),
                   atomic_read(&fscache_n_volumes),
                   atomic_read(&fscache_n_volumes_collision),
                   atomic_read(&fscache_n_volumes_nomem)
                   );

        seq_printf(m, "Acquire: n=%u ok=%u oom=%u\n",
                   atomic_read(&fscache_n_acquires),
                   atomic_read(&fscache_n_acquires_ok),
                   atomic_read(&fscache_n_acquires_oom));

        seq_printf(m, "LRU    : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
                   atomic_read(&fscache_n_cookies_lru),
                   atomic_read(&fscache_n_cookies_lru_expired),
                   atomic_read(&fscache_n_cookies_lru_removed),
                   atomic_read(&fscache_n_cookies_lru_dropped),
                   timer_pending(&fscache_cookie_lru_timer) ?
                   fscache_cookie_lru_timer.expires - jiffies : 0);

        seq_printf(m, "Invals : n=%u\n",
                   atomic_read(&fscache_n_invalidates));

        seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
                   atomic_read(&fscache_n_updates),
                   atomic_read(&fscache_n_resizes),
                   atomic_read(&fscache_n_resizes_null));

        seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
                   atomic_read(&fscache_n_relinquishes),
                   atomic_read(&fscache_n_relinquishes_retire),
                   atomic_read(&fscache_n_relinquishes_dropped));

        seq_printf(m, "NoSpace: nwr=%u ncr=%u cull=%u\n",
                   atomic_read(&fscache_n_no_write_space),
                   atomic_read(&fscache_n_no_create_space),
                   atomic_read(&fscache_n_culled));

        seq_printf(m, "IO     : rd=%u wr=%u mis=%u\n",
                   atomic_read(&fscache_n_read),
                   atomic_read(&fscache_n_write),
                   atomic_read(&fscache_n_dio_misfit));
        return 0;
}