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/****************************************************************
* *
* Copyright (c) 2012-2021 Fidelity National Information *
* Services, Inc. and/or its subsidiaries. All rights reserved. *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include <errno.h>
#include <sys/sem.h>
#include "gtm_string.h"
#include "gdsroot.h"
#include "gdsblk.h"
#include "gdsbml.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "gdsblkops.h"
#include "gdscc.h"
#include "filestruct.h"
#include "jnl.h"
#include "min_max.h"
#include "gtmmsg.h"
#include "error.h"
#include "eintr_wrappers.h"
#include "recover_truncate.h"
#include "interlock.h"
#include "shmpool.h"
#include "gtmio.h"
#include "clear_cache_array.h"
#include "is_proc_alive.h"
#include "do_semop.h"
#include "gtm_semutils.h"
#include "db_write_eof_block.h"
error_def(ERR_DBFILERR);
error_def(ERR_MUTRUNCERROR);
GBLREF uint4 process_id;
void recover_truncate(sgmnt_addrs *csa, sgmnt_data_ptr_t csd, gd_region* reg)
{
char *err_msg;
block_id old_total, cur_total, new_total;
off_t old_size, cur_size, new_size;
int ftrunc_status, status;
unix_db_info *udi;
int blk_size, semval;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
if (NULL != csa->nl && csa->nl->trunc_pid && !is_proc_alive(csa->nl->trunc_pid, 0))
csa->nl->trunc_pid = 0;
if (!csd->before_trunc_total_blks)
return;
assert(((GDSVCURR == csd->desired_db_format) || (GDSV7m == csd->desired_db_format)
|| (BLK_ID_32_VER > csd->desired_db_format))
&& (csd->blks_to_upgrd == 0)
&& (dba_mm != csd->acc_meth));
/* If called from db_init, assure we've grabbed the access semaphor and are the only process attached to the database.
* Otherwise, we should have crit when called from wcs_recover. */
udi = FILE_INFO(reg);
assert((udi->grabbed_access_sem && (DB_COUNTER_SEM_INCR == (semval = semctl(udi->semid, DB_COUNTER_SEM, GETVAL))))
|| csa->now_crit);
/* Interrupted truncate scenario */
if (NULL != csa->nl)
csa->nl->root_search_cycle++;
old_total = csd->before_trunc_total_blks; /* Pre-truncate total_blks */
blk_size = csd->blk_size;
old_size = (off_t)SIZEOF_FILE_HDR(csd) + (off_t)(old_total + 1) * blk_size; /* Pre-truncate file size (in bytes) */
cur_total = csa->ti->total_blks; /* Actual total_blks right now */
cur_size = (off_t)gds_file_size(reg->dyn.addr->file_cntl) * DISK_BLOCK_SIZE; /* Actual file size right now (in bytes) */
new_total = csd->after_trunc_total_blks; /* Post-truncate total_blks */
new_size = old_size - (off_t)(old_total - new_total) * blk_size; /* Post-truncate file size (in bytes) */
/* We don't expect FTRUNCATE to leave the file size in an 'in between' state, hence the assert below. */
assert(old_size == cur_size || new_size == cur_size);
if (new_total == cur_total && old_size == cur_size)
{ /* Crash after reducing total_blks, before successful FTRUNCATE. Complete the FTRUNCATE here. */
DBGEHND((stdout, "DBG:: recover_truncate() -- completing truncate, old_total = [%lu], cur_total = [%lu]\n",
old_total, new_total));
assert(csd->before_trunc_free_blocks >= DELTA_FREE_BLOCKS(old_total, new_total));
csa->ti->free_blocks = csd->before_trunc_free_blocks - DELTA_FREE_BLOCKS(old_total, new_total);
clear_cache_array(csa, csd, reg, new_total, old_total);
status = db_write_eof_block(udi, udi->fd, blk_size, new_size - blk_size, &(TREF(dio_buff)));
if (status != 0)
{
err_msg = (char *)STRERROR(errno);
rts_error_csa(CSA_ARG(csa) VARLSTCNT(6) ERR_MUTRUNCERROR, 4, REG_LEN_STR(reg), LEN_AND_STR(err_msg));
return;
}
FTRUNCATE(FILE_INFO(reg)->fd, new_size, ftrunc_status);
if (ftrunc_status != 0)
{
err_msg = (char *)STRERROR(errno);
rts_error_csa(CSA_ARG(csa) VARLSTCNT(6) ERR_MUTRUNCERROR, 4, REG_LEN_STR(reg), LEN_AND_STR(err_msg));
return;
}
} else
{ /* Crash before even changing csa->ti->total_blks OR after successful FTRUNCATE */
/* In either case, the db file is in a consistent state, so no need to do anything further */
assert((old_total == cur_total && old_size == cur_size) || (new_total == cur_total && new_size == cur_size));
if (!((old_total == cur_total && old_size == cur_size) || (new_total == cur_total && new_size == cur_size)))
RTS_ERROR_CSA_ABT(csa, VARLSTCNT(4) ERR_DBFILERR, 2, DB_LEN_STR(reg));
}
csd->before_trunc_total_blks = 0; /* indicate CONSISTENT */
}
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