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/****************************************************************
* *
* Copyright 2005, 2012 Fidelity Information Services, Inc *
* *
* 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_string.h"
#include "gdsroot.h"
#include "v15_gdsroot.h"
#include "gdsblk.h"
#include "gdsdbver.h"
#include "gds_blk_upgrade.h"
#include "iosp.h"
#include "copy.h"
#define SPACE_NEEDED (SIZEOF(blk_hdr) - SIZEOF(v15_blk_hdr))
GBLREF boolean_t gtm_blkupgrade_override;
GBLREF uint4 gtm_blkupgrade_flag; /* control whether dynamic upgrade is attempted or not */
error_def(ERR_DYNUPGRDFAIL);
int4 gds_blk_upgrade(sm_uc_ptr_t gds_blk_src, sm_uc_ptr_t gds_blk_trg, int4 blksize, enum db_ver *ondsk_blkver)
{
blk_hdr_ptr_t bp;
v15_blk_hdr_ptr_t v15bp;
v15_trans_num v15tn;
uint4 v15bsiz, v15levl;
assert(gds_blk_src);
assert(gds_blk_trg);
/* Assert that the input buffer is 8-byte aligned for us to freely de-reference 8-byte tn fields from the buffer header.
* If not, we should have had to use GET/PUT_xxxx macros from copy.
* Note that in GDSV4 format in VMS, the "tn" field in the block-header is not 4-byte offset aligned so we
* need to use the GET_ULONG macro to fetch the field from the block header. But since "tn" is 8-byte
* offset aligned in the new format, there is no need of any such macro while assigning bp->tn.
*/
assert(0 == ((long)gds_blk_src & 0x7)); /* Assume 8 byte alignment */
assert(0 == ((long)gds_blk_trg & 0x7));
v15bp = (v15_blk_hdr_ptr_t)gds_blk_src;
bp = (blk_hdr_ptr_t)gds_blk_trg;
assert((SIZEOF(v15_blk_hdr) <= v15bp->bsiz) || (UPGRADE_ALWAYS == gtm_blkupgrade_flag));
UNIX_ONLY(v15tn = v15bp->tn);
VMS_ONLY(GET_ULONG(v15tn, &v15bp->tn));
v15bsiz = v15bp->bsiz;
if (v15bsiz > blksize) /* Exceeds maximum block size. Not a valid V4 block. Return without upgrading */
{
assert(UPGRADE_NEVER != gtm_blkupgrade_flag);
if (UPGRADE_IF_NEEDED == gtm_blkupgrade_flag)
{
if (NULL != ondsk_blkver)
*ondsk_blkver = GDSV6;
return SS_NORMAL;
} else
{
if (NULL != ondsk_blkver)
*ondsk_blkver = GDSV4;
return ERR_DYNUPGRDFAIL;
}
}
if (NULL != ondsk_blkver)
*ondsk_blkver = GDSV4;
v15bsiz += SPACE_NEEDED;
if (v15bsiz > blksize) /* Exceeds maximum block size */
return ERR_DYNUPGRDFAIL;
v15levl = v15bp->levl;
memmove((gds_blk_trg + SPACE_NEEDED), gds_blk_src, v15bp->bsiz); /* Shift/copy block requisite amount */
bp->tn = v15tn;
bp->bsiz = v15bsiz;
bp->levl = v15levl;
bp->bver = GDSV6;
return SS_NORMAL;
}
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