source: vendor/current/lib/tdb/test/run-transaction-expand.c

#include "../common/tdb_private.h"

/* Speed up the tests, but do the actual sync tests. */
static unsigned int sync_counts = 0;
static inline int fake_fsync(int fd)
{
        sync_counts++;
        return 0;
}
#define fsync fake_fsync

#ifdef MS_SYNC
static inline int fake_msync(void *addr, size_t length, int flags)
{
        sync_counts++;
        return 0;
}
#define msync fake_msync
#endif

#ifdef HAVE_FDATASYNC
static inline int fake_fdatasync(int fd)
{
        sync_counts++;
        return 0;
}
#define fdatasync fake_fdatasync
#endif

#include "../common/io.c"
#include "../common/tdb.c"
#include "../common/lock.c"
#include "../common/freelist.c"
#include "../common/traverse.c"
#include "../common/transaction.c"
#include "../common/error.c"
#include "../common/open.c"
#include "../common/check.c"
#include "../common/hash.c"
#include "../common/mutex.c"
#include "tap-interface.h"
#include <stdlib.h>
#include "logging.h"

static void write_record(struct tdb_context *tdb, size_t extra_len,
                         TDB_DATA *data)
{
        TDB_DATA key;
        key.dsize = strlen("hi");
        key.dptr = discard_const_p(uint8_t, "hi");

        data->dsize += extra_len;
        tdb_transaction_start(tdb);
        tdb_store(tdb, key, *data, TDB_REPLACE);
        tdb_transaction_commit(tdb);
}

int main(int argc, char *argv[])
{
        struct tdb_context *tdb;
        size_t i;
        TDB_DATA data;
        struct tdb_record rec;
        tdb_off_t off;

        /* Do *not* suppress sync for this test; we do it ourselves. */
        unsetenv("TDB_NO_FSYNC");

        plan_tests(5);
        tdb = tdb_open_ex("run-transaction-expand.tdb",
                          1024, TDB_CLEAR_IF_FIRST,
                          O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
        ok1(tdb);

        data.dsize = 0;
        data.dptr = calloc(1000, getpagesize());
        if (data.dptr == NULL) {
                diag("Unable to allocate memory for data.dptr");
                tdb_close(tdb);
                exit(1);
        }

        /* Simulate a slowly growing record. */
        for (i = 0; i < 1000; i++)
                write_record(tdb, getpagesize(), &data);

        tdb_ofs_read(tdb, TDB_RECOVERY_HEAD, &off);
        tdb_read(tdb, off, &rec, sizeof(rec), DOCONV());
        diag("TDB size = %zu, recovery = %llu-%llu",
             (size_t)tdb->map_size, (unsigned long long)off, (unsigned long long)(off + sizeof(rec) + rec.rec_len));

        /* We should only be about 5 times larger than largest record. */
        ok1(tdb->map_size < 6 * i * getpagesize());
        tdb_close(tdb);

        tdb = tdb_open_ex("run-transaction-expand.tdb",
                          1024, TDB_CLEAR_IF_FIRST,
                          O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
        ok1(tdb);

        data.dsize = 0;

        /* Simulate a slowly growing record, repacking to keep
         * recovery area at end. */
        for (i = 0; i < 1000; i++) {
                write_record(tdb, getpagesize(), &data);
                if (i % 10 == 0)
                        tdb_repack(tdb);
        }

        tdb_ofs_read(tdb, TDB_RECOVERY_HEAD, &off);
        tdb_read(tdb, off, &rec, sizeof(rec), DOCONV());
        diag("TDB size = %zu, recovery = %llu-%llu",
             (size_t)tdb->map_size, (unsigned long long)off, (unsigned long long)(off + sizeof(rec) + rec.rec_len));

        /* We should only be about 4 times larger than largest record. */
        ok1(tdb->map_size < 5 * i * getpagesize());

        /* We should have synchronized multiple times. */
        ok1(sync_counts);
        tdb_close(tdb);
        free(data.dptr);

        return exit_status();
}