/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998
 *      Sleepycat Software.  All rights reserved.
 */
#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)mp_pr.c       10.30 (Sleepycat) 10/1/98";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#endif

#include "db_int.h"
#include "db_page.h"
#include "shqueue.h"
#include "db_shash.h"
#include "mp.h"
#include "db_auto.h"
#include "db_ext.h"
#include "common_ext.h"

static void __memp_pbh __P((DB_MPOOL *, BH *, size_t *, FILE *));

/*
 * memp_stat --
 *      Display MPOOL statistics.
 */
int
memp_stat(dbmp, gspp, fspp, db_malloc)
        DB_MPOOL *dbmp;
        DB_MPOOL_STAT **gspp;
        DB_MPOOL_FSTAT ***fspp;
        void *(*db_malloc) __P((size_t));
{
        DB_MPOOL_FSTAT **tfsp;
        MPOOLFILE *mfp;
        size_t len, nlen;
        int ret;
        char *name;

        MP_PANIC_CHECK(dbmp);

        /* Allocate space for the global statistics. */
        if (gspp != NULL) {
                *gspp = NULL;

                if ((ret = __os_malloc(sizeof(**gspp), db_malloc, gspp)) != 0)
                        return (ret);

                LOCKREGION(dbmp);

                /* Copy out the global statistics. */
                **gspp = dbmp->mp->stat;
                (*gspp)->st_hash_buckets = dbmp->mp->htab_buckets;
                (*gspp)->st_region_wait =
                    dbmp->mp->rlayout.lock.mutex_set_wait;
                (*gspp)->st_region_nowait =
                    dbmp->mp->rlayout.lock.mutex_set_nowait;
                (*gspp)->st_refcnt = dbmp->mp->rlayout.refcnt;
                (*gspp)->st_regsize = dbmp->mp->rlayout.size;

                UNLOCKREGION(dbmp);
        }

        if (fspp != NULL) {
                *fspp = NULL;

                LOCKREGION(dbmp);

                /* Count the MPOOLFILE structures. */
                for (len = 0,
                    mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
                    mfp != NULL;
                    ++len, mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile))
                        ;

                UNLOCKREGION(dbmp);

                if (len == 0)
                        return (0);

                /* Allocate space for the pointers. */
                len = (len + 1) * sizeof(DB_MPOOL_FSTAT *);
                if ((ret = __os_malloc(len, db_malloc, fspp)) != 0)
                        return (ret);

                LOCKREGION(dbmp);

                /* Build each individual entry. */
                for (tfsp = *fspp,
                    mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
                    mfp != NULL;
                    ++tfsp, mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile)) {
                        name = __memp_fns(dbmp, mfp);
                        nlen = strlen(name);
                        len = sizeof(DB_MPOOL_FSTAT) + nlen + 1;
                        if ((ret = __os_malloc(len, db_malloc, tfsp)) != 0)
                                return (ret);
                        **tfsp = mfp->stat;
                        (*tfsp)->file_name = (char *)
                            (u_int8_t *)*tfsp + sizeof(DB_MPOOL_FSTAT);
                        memcpy((*tfsp)->file_name, name, nlen + 1);
                }
                *tfsp = NULL;

                UNLOCKREGION(dbmp);
        }
        return (0);
}

/*
 * __memp_fn --
 *      On errors we print whatever is available as the file name.
 *
 * PUBLIC: char * __memp_fn __P((DB_MPOOLFILE *));
 */
char *
__memp_fn(dbmfp)
        DB_MPOOLFILE *dbmfp;
{
        return (__memp_fns(dbmfp->dbmp, dbmfp->mfp));
}

/*
 * __memp_fns --
 *      On errors we print whatever is available as the file name.
 *
 * PUBLIC: char * __memp_fns __P((DB_MPOOL *, MPOOLFILE *));
 *
 */
char *
__memp_fns(dbmp, mfp)
        DB_MPOOL *dbmp;
        MPOOLFILE *mfp;
{
        if (mfp->path_off == 0)
                return ((char *)"temporary");

        return ((char *)R_ADDR(dbmp, mfp->path_off));
}

#define FMAP_ENTRIES    200                     /* Files we map. */

#define MPOOL_DUMP_HASH 0x01                    /* Debug hash chains. */
#define MPOOL_DUMP_LRU  0x02                    /* Debug LRU chains. */
#define MPOOL_DUMP_MEM  0x04                    /* Debug region memory. */
#define MPOOL_DUMP_ALL  0x07                    /* Debug all. */


/*
 * __memp_dump_region --
 *      Display MPOOL structures.
 *
 * PUBLIC: void __memp_dump_region __P((DB_MPOOL *, char *, FILE *));
 */
void
__memp_dump_region(dbmp, area, fp)
        DB_MPOOL *dbmp;
        char *area;
        FILE *fp;
{
        BH *bhp;
        DB_HASHTAB *htabp;
        DB_MPOOLFILE *dbmfp;
        MPOOL *mp;
        MPOOLFILE *mfp;
        size_t bucket, fmap[FMAP_ENTRIES + 1];
        u_int32_t flags;
        int cnt;

        /* Make it easy to call from the debugger. */
        if (fp == NULL)
                fp = stderr;

        for (flags = 0; *area != '\0'; ++area)
                switch (*area) {
                case 'A':
                        LF_SET(MPOOL_DUMP_ALL);
                        break;
                case 'h':
                        LF_SET(MPOOL_DUMP_HASH);
                        break;
                case 'l':
                        LF_SET(MPOOL_DUMP_LRU);
                        break;
                case 'm':
                        LF_SET(MPOOL_DUMP_MEM);
                        break;
                }

        LOCKREGION(dbmp);

        mp = dbmp->mp;

        /* Display MPOOL structures. */
        (void)fprintf(fp, "%s\nPool (region addr 0x%lx, alloc addr 0x%lx)\n",
            DB_LINE, (u_long)dbmp->reginfo.addr, (u_long)dbmp->addr);

        /* Display the MPOOLFILE structures. */
        cnt = 0;
        for (mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
            mfp != NULL; mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile), ++cnt) {
                (void)fprintf(fp, "file #%d: %s: refs %lu, type %ld, %s\n",
                    cnt + 1, __memp_fns(dbmp, mfp), (u_long)mfp->ref,
                    (long)mfp->ftype,
                    F_ISSET(mfp, MP_CAN_MMAP) ? "mmap" : "read/write");
                    if (cnt < FMAP_ENTRIES)
                        fmap[cnt] = R_OFFSET(dbmp, mfp);
        }

        for (dbmfp = TAILQ_FIRST(&dbmp->dbmfq);
            dbmfp != NULL; dbmfp = TAILQ_NEXT(dbmfp, q), ++cnt) {
                (void)fprintf(fp, "file #%d: %s: fd: %d: per-process, %s\n",
                    cnt + 1, __memp_fn(dbmfp), dbmfp->fd,
                    F_ISSET(dbmfp, MP_READONLY) ? "readonly" : "read/write");
                    if (cnt < FMAP_ENTRIES)
                        fmap[cnt] = R_OFFSET(dbmp, mfp);
        }
        if (cnt < FMAP_ENTRIES)
                fmap[cnt] = INVALID;
        else
                fmap[FMAP_ENTRIES] = INVALID;

        /* Display the hash table list of BH's. */
        if (LF_ISSET(MPOOL_DUMP_HASH)) {
                (void)fprintf(fp,
            "%s\nBH hash table (%lu hash slots)\npageno, file, ref, address\n",
                    DB_LINE, (u_long)mp->htab_buckets);
                for (htabp = dbmp->htab,
                    bucket = 0; bucket < mp->htab_buckets; ++htabp, ++bucket) {
                        if (SH_TAILQ_FIRST(&dbmp->htab[bucket], __bh) != NULL)
                                (void)fprintf(fp, "%lu:\n", (u_long)bucket);
                        for (bhp = SH_TAILQ_FIRST(&dbmp->htab[bucket], __bh);
                            bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, hq, __bh))
                                __memp_pbh(dbmp, bhp, fmap, fp);
                }
        }

        /* Display the LRU list of BH's. */
        if (LF_ISSET(MPOOL_DUMP_LRU)) {
                (void)fprintf(fp, "%s\nBH LRU list\n", DB_LINE);
                (void)fprintf(fp, "pageno, file, ref, address\n");
                for (bhp = SH_TAILQ_FIRST(&dbmp->mp->bhq, __bh);
                    bhp != NULL; bhp = SH_TAILQ_NEXT(bhp, q, __bh))
                        __memp_pbh(dbmp, bhp, fmap, fp);
        }

        if (LF_ISSET(MPOOL_DUMP_MEM))
                __db_shalloc_dump(dbmp->addr, fp);

        UNLOCKREGION(dbmp);

        /* Flush in case we're debugging. */
        (void)fflush(fp);
}

/*
 * __memp_pbh --
 *      Display a BH structure.
 */
static void
__memp_pbh(dbmp, bhp, fmap, fp)
        DB_MPOOL *dbmp;
        BH *bhp;
        size_t *fmap;
        FILE *fp;
{
        static const FN fn[] = {
                { BH_CALLPGIN,  "callpgin" },
                { BH_DIRTY,     "dirty" },
                { BH_DISCARD,   "discard" },
                { BH_LOCKED,    "locked" },
                { BH_TRASH,     "trash" },
                { BH_WRITE,     "write" },
                { 0 },
        };
        int i;

        for (i = 0; i < FMAP_ENTRIES; ++i)
                if (fmap[i] == INVALID || fmap[i] == bhp->mf_offset)
                        break;

        if (fmap[i] == INVALID)
                (void)fprintf(fp, "  %4lu, %lu, %2lu, %lu",
                    (u_long)bhp->pgno, (u_long)bhp->mf_offset,
                    (u_long)bhp->ref, (u_long)R_OFFSET(dbmp, bhp));
        else
                (void)fprintf(fp, "  %4lu,   #%d,  %2lu, %lu",
                    (u_long)bhp->pgno, i + 1,
                    (u_long)bhp->ref, (u_long)R_OFFSET(dbmp, bhp));

        __db_prflags(bhp->flags, fn, fp);

        (void)fprintf(fp, "\n");
}