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/****************************************************************
* *
* Copyright (c) 2016 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 "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsblk.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "jnl.h"
#include "aio_shim.h"
#include "gtmio.h"
#include "anticipatory_freeze.h"
#include "wcs_wt.h"
#include "gdsbgtr.h"
GBLREF uint4 process_id;
/* Reissues a pending qio from the WIP queue. In case of EAGAIN and holding crit, it issues a SYNCIO instead.
* And if the SYNCIO succeeds, a special value of SYNCIO_MORPH_SUCCESS is returned so caller can handle this
* situation appropriately (by moving the cr from wip queue to active queue or out of all queues).
*/
int wcs_wt_restart(unix_db_info *udi, cache_state_rec_ptr_t csr)
{
int save_errno;
blk_hdr_ptr_t bp, save_bp;
sgmnt_data_ptr_t csd;
cache_que_head_ptr_t ahead;
sgmnt_addrs *csa;
assert(0 > SYNCIO_MORPH_SUCCESS); /* save_errno should be positive in all cases except when == SYNCIO_MORPH_SUCCESS */
csa = &udi->s_addrs;
BG_TRACE_PRO_ANY(csa, wcs_wt_restart_invoked);
csd = csa->hdr;
bp = (blk_hdr_ptr_t)(GDS_ANY_REL2ABS(csa, csr->buffaddr));
if (!csr->wip_is_encr_buf)
save_bp = bp;
else
save_bp = (blk_hdr_ptr_t)GDS_ANY_ENCRYPTGLOBUF(bp, csa);
DB_LSEEKWRITEASYNCRESTART(csa, udi, udi->fn, udi->fd, save_bp, csr, save_errno);
assert(0 == save_errno IF_LIBAIO(|| EAGAIN == save_errno));
if (0 == save_errno)
csr->epid = process_id;
else if (EAGAIN == save_errno)
{ /* ASYNC IO could not be started */
BG_TRACE_PRO_ANY(csa, wcs_wt_restart_eagain);
if (csa->now_crit && !csa->region->read_only)
{ /* Holding crit and have read-write access to the database.
* Do synchronous IO given OS does not have enough memory temporarily.
*/
DB_LSEEKWRITE(csa, udi, udi->fn, udi->fd,
csr->aiocb.aio_offset, save_bp, csr->aiocb.aio_nbytes, save_errno);
assert(0 <= save_errno);
if (0 == save_errno)
{ /* SYNCIO succeeded. Return special status */
save_errno = SYNCIO_MORPH_SUCCESS;
}
} else
{ /* Need to reinsert this back into the active queue.
* Clearing csr->epid and returning 0 indicates this to caller.
*/
BG_TRACE_PRO_ANY(csa, wcs_wt_restart_reinsert);
csr->epid = 0;
save_errno = 0;
}
}
return save_errno;
}
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