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/****************************************************************
* *
* Copyright (c) 2001-2018 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 "gtm_ipc.h"
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include "gtm_unistd.h"
#include "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "error.h"
#include "filestruct.h"
#include "gvcst_protos.h"
#include "jnl.h"
#include "do_semop.h"
#include "mmseg.h"
#include "ipcrmid.h"
#include "util.h"
#include "ftok_sems.h"
#include "gtmimagename.h"
#include "gtmio.h"
#include "have_crit.h"
GBLREF gd_region *db_init_region;
error_def(ERR_VERMISMATCH);
CONDITION_HANDLER(dbinit_ch)
{
START_CH(TRUE);
db_init_err_cleanup(FALSE);
NEXTCH
}
void db_init_err_cleanup(boolean_t retry_dbinit)
{
unix_db_info *udi;
gd_segment *seg;
sgmnt_addrs *csa;
int rc, lcl_new_dbinit_ipc;
boolean_t ftok_counter_halted, access_counter_halted, decrement_ftok_counter;
/* Here, we can not rely on the validity of csa->hdr because this function can be triggered anywhere in db_init().Because
* we don't have access to file header, we can not know if counters are disabled so we go by our best guess, not disabled,
* during cleanup.
*/
assert(NULL != db_init_region);
seg = db_init_region->dyn.addr;
udi = NULL;
if (NULL != seg->file_cntl)
udi = FILE_INFO(db_init_region);
if (NULL != udi)
{
if (FD_INVALID != udi->fd && !retry_dbinit)
CLOSEFILE_RESET(udi->fd, rc); /* resets "udi->fd" to FD_INVALID */
assert(FD_INVALID == udi->fd || retry_dbinit);
csa = &udi->s_addrs;
# ifdef _AIX
if ((NULL != csa->hdr) && (dba_mm == db_init_region->dyn.addr->acc_meth))
{
assert((NULL != csa->db_addrs[1]) && (csa->db_addrs[1] > csa->db_addrs[0]));
munmap((caddr_t)csa->db_addrs[0], (size_t)(csa->db_addrs[1] - csa->db_addrs[0]));
}
# endif
if (NULL != csa->jnl)
{
free(csa->jnl);
csa->jnl = NULL;
}
/* If shared memory is not available or if this is a VERMISMATCH error situation (where we do not know the exact
* position of csa->nl->ftok_counter_halted or if it even exists in the other version), we have to be pessimistic
* and assume the counters are halted. This avoids prematurely removing the semaphores.
*/
if ((NULL != csa->nl) && ((int)ERR_VERMISMATCH != SIGNAL))
{
ftok_counter_halted = csa->nl->ftok_counter_halted;
access_counter_halted = csa->nl->access_counter_halted;
if (csa->now_crit)
{ /* Ensure that we don't hold crit before detaching shared memory */
assert(!csa->now_crit);
rel_crit(db_init_region);
}
shmdt((caddr_t)csa->nl);
csa->nl = (node_local_ptr_t)NULL;
} else
{
ftok_counter_halted = TRUE;
access_counter_halted = TRUE;
}
if (udi->shm_created && (INVALID_SHMID != udi->shmid))
{
shm_rmid(udi->shmid);
udi->shmid = INVALID_SHMID;
udi->shm_created = FALSE;
}
if (udi->sem_created && (INVALID_SEMID != udi->semid))
{
sem_rmid(udi->semid);
udi->semid = INVALID_SEMID;
udi->sem_created = FALSE;
udi->grabbed_access_sem = FALSE;
udi->counter_acc_incremented = FALSE;
}
if (udi->counter_acc_incremented && !access_counter_halted)
{
assert((INVALID_SEMID != udi->semid) && !db_init_region->read_only);
/* decrement the read-write sem */
do_semop(udi->semid, DB_COUNTER_SEM, -DB_COUNTER_SEM_INCR, SEM_UNDO | IPC_NOWAIT);
udi->counter_acc_incremented = FALSE;
}
if (udi->grabbed_access_sem)
{
do_semop(udi->semid, DB_CONTROL_SEM, -1, SEM_UNDO | IPC_NOWAIT); /* release the startup-shutdown sem */
udi->grabbed_access_sem = FALSE;
}
decrement_ftok_counter = udi->counter_ftok_incremented
? (ftok_counter_halted ? DECR_CNT_SAFE : DECR_CNT_TRUE)
: DECR_CNT_FALSE;
if (udi->grabbed_ftok_sem)
{
ftok_sem_release(db_init_region, decrement_ftok_counter, TRUE);
assert(FALSE == udi->counter_ftok_incremented);
} else if (udi->counter_ftok_incremented)
do_semop(udi->ftok_semid, DB_COUNTER_SEM, -DB_COUNTER_SEM_INCR, SEM_UNDO | IPC_NOWAIT);
/* Below reset needed for "else if" case above but do it for "if" case too (in pro) just in case */
udi->counter_ftok_incremented = FALSE;
udi->grabbed_ftok_sem = FALSE;
if (!IS_GTCM_GNP_SERVER_IMAGE && !retry_dbinit) /* gtcm_gnp_server reuses file_cntl */
{
free(seg->file_cntl->file_info);
free(seg->file_cntl);
seg->file_cntl = NULL;
}
}
/* Enable interrupts in case we are here with intrpt_ok_state == INTRPT_IN_GVCST_INIT due to an rts error.
* Normally we would have the new state stored in "prev_intrpt_state" but that is not possible here because
* the corresponding DEFER_INTERRUPTS happened in gvcst_init.c (a different function) so we have an assert
* there that the previous state was INTRPT_OK_TO_INTERRUPT and use that instead of prev_intrpt_state here.
*/
if (!retry_dbinit)
ENABLE_INTERRUPTS(INTRPT_IN_GVCST_INIT, INTRPT_OK_TO_INTERRUPT);
}
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