// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"

struct xstats xfsstats;

static int counter_val(struct xfsstats __percpu *stats, int idx)
{
        int val = 0, cpu;

        for_each_possible_cpu(cpu)
                val += *(((__u32 *)per_cpu_ptr(stats, cpu) + idx));
        return val;
}

int xfs_stats_format(struct xfsstats __percpu *stats, char *buf)
{
        int             i, j;
        int             len = 0;
        uint64_t        xs_xstrat_bytes = 0;
        uint64_t        xs_write_bytes = 0;
        uint64_t        xs_read_bytes = 0;

        static const struct xstats_entry {
                char    *desc;
                int     endpoint;
        } xstats[] = {
                { "extent_alloc",       xfsstats_offset(xs_abt_lookup)  },
                { "abt",                xfsstats_offset(xs_blk_mapr)    },
                { "blk_map",            xfsstats_offset(xs_bmbt_lookup) },
                { "bmbt",               xfsstats_offset(xs_dir_lookup)  },
                { "dir",                xfsstats_offset(xs_trans_sync)  },
                { "trans",              xfsstats_offset(xs_ig_attempts) },
                { "ig",                 xfsstats_offset(xs_log_writes)  },
                { "log",                xfsstats_offset(xs_try_logspace)},
                { "push_ail",           xfsstats_offset(xs_xstrat_quick)},
                { "xstrat",             xfsstats_offset(xs_write_calls) },
                { "rw",                 xfsstats_offset(xs_attr_get)    },
                { "attr",               xfsstats_offset(xs_iflush_count)},
                { "icluster",           xfsstats_offset(vn_active)      },
                { "vnodes",             xfsstats_offset(xb_get)         },
                { "buf",                xfsstats_offset(xs_abtb_2)      },
                { "abtb2",              xfsstats_offset(xs_abtc_2)      },
                { "abtc2",              xfsstats_offset(xs_bmbt_2)      },
                { "bmbt2",              xfsstats_offset(xs_ibt_2)       },
                { "ibt2",               xfsstats_offset(xs_fibt_2)      },
                { "fibt2",              xfsstats_offset(xs_rmap_2)      },
                { "rmapbt",             xfsstats_offset(xs_refcbt_2)    },
                { "refcntbt",           xfsstats_offset(xs_qm_dqreclaims)},
                /* we print both series of quota information together */
                { "qm",                 xfsstats_offset(xs_xstrat_bytes)},
        };

        /* Loop over all stats groups */

        for (i = j = 0; i < ARRAY_SIZE(xstats); i++) {
                len += snprintf(buf + len, PATH_MAX - len, "%s",
                                xstats[i].desc);
                /* inner loop does each group */
                for (; j < xstats[i].endpoint; j++)
                        len += snprintf(buf + len, PATH_MAX - len, " %u",
                                        counter_val(stats, j));
                len += snprintf(buf + len, PATH_MAX - len, "\n");
        }
        /* extra precision counters */
        for_each_possible_cpu(i) {
                xs_xstrat_bytes += per_cpu_ptr(stats, i)->s.xs_xstrat_bytes;
                xs_write_bytes += per_cpu_ptr(stats, i)->s.xs_write_bytes;
                xs_read_bytes += per_cpu_ptr(stats, i)->s.xs_read_bytes;
        }

        len += snprintf(buf + len, PATH_MAX-len, "xpc %Lu %Lu %Lu\n",
                        xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
        len += snprintf(buf + len, PATH_MAX-len, "debug %u\n",
#if defined(DEBUG)
                1);
#else
                0);
#endif

        return len;
}

void xfs_stats_clearall(struct xfsstats __percpu *stats)
{
        int             c;
        uint32_t        vn_active;

        xfs_notice(NULL, "Clearing xfsstats");
        for_each_possible_cpu(c) {
                preempt_disable();
                /* save vn_active, it's a universal truth! */
                vn_active = per_cpu_ptr(stats, c)->s.vn_active;
                memset(per_cpu_ptr(stats, c), 0, sizeof(*stats));
                per_cpu_ptr(stats, c)->s.vn_active = vn_active;
                preempt_enable();
        }
}

#ifdef CONFIG_PROC_FS
/* legacy quota interfaces */
#ifdef CONFIG_XFS_QUOTA

#define XFSSTAT_START_XQMSTAT xfsstats_offset(xs_qm_dqreclaims)
#define XFSSTAT_END_XQMSTAT xfsstats_offset(xs_qm_dquot)

static int xqm_proc_show(struct seq_file *m, void *v)
{
        /* maximum; incore; ratio free to inuse; freelist */
        seq_printf(m, "%d\t%d\t%d\t%u\n",
                   0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT),
                   0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT + 1));
        return 0;
}

/* legacy quota stats interface no 2 */
static int xqmstat_proc_show(struct seq_file *m, void *v)
{
        int j;

        seq_printf(m, "qm");
        for (j = XFSSTAT_START_XQMSTAT; j < XFSSTAT_END_XQMSTAT; j++)
                seq_printf(m, " %u", counter_val(xfsstats.xs_stats, j));
        seq_putc(m, '\n');
        return 0;
}
#endif /* CONFIG_XFS_QUOTA */

int
xfs_init_procfs(void)
{
        if (!proc_mkdir("fs/xfs", NULL))
                return -ENOMEM;

        if (!proc_symlink("fs/xfs/stat", NULL,
                          "/sys/fs/xfs/stats/stats"))
                goto out;

#ifdef CONFIG_XFS_QUOTA
        if (!proc_create_single("fs/xfs/xqmstat", 0, NULL, xqmstat_proc_show))
                goto out;
        if (!proc_create_single("fs/xfs/xqm", 0, NULL, xqm_proc_show))
                goto out;
#endif
        return 0;

out:
        remove_proc_subtree("fs/xfs", NULL);
        return -ENOMEM;
}

void
xfs_cleanup_procfs(void)
{
        remove_proc_subtree("fs/xfs", NULL);
}
#endif /* CONFIG_PROC_FS */