82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/****************************************************************
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* *
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* Copyright 2005, 2009 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gtm_string.h"
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#include "gdsroot.h"
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#include "v15_gdsroot.h"
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#include "gdsblk.h"
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#include "gdsdbver.h"
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#include "gds_blk_upgrade.h"
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#include "iosp.h"
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#include "copy.h"
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#define SPACE_NEEDED (SIZEOF(blk_hdr) - SIZEOF(v15_blk_hdr))
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GBLREF boolean_t gtm_blkupgrade_override;
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GBLREF uint4 gtm_blkupgrade_flag; /* control whether dynamic upgrade is attempted or not */
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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)
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{
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blk_hdr_ptr_t bp;
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v15_blk_hdr_ptr_t v15bp;
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v15_trans_num v15tn;
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uint4 v15bsiz, v15levl;
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error_def(ERR_DYNUPGRDFAIL);
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assert(gds_blk_src);
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assert(gds_blk_trg);
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/* Assert that the input buffer is 8-byte aligned for us to freely de-reference 8-byte tn fields from the buffer header.
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* If not, we should have had to use GET/PUT_xxxx macros from copy.
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* Note that in GDSV4 format in VMS, the "tn" field in the block-header is not 4-byte offset aligned so we
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* need to use the GET_ULONG macro to fetch the field from the block header. But since "tn" is 8-byte
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* offset aligned in the new format, there is no need of any such macro while assigning bp->tn.
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*/
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assert(0 == ((long)gds_blk_src & 0x7)); /* Assume 8 byte alignment */
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assert(0 == ((long)gds_blk_trg & 0x7));
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v15bp = (v15_blk_hdr_ptr_t)gds_blk_src;
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bp = (blk_hdr_ptr_t)gds_blk_trg;
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assert((SIZEOF(v15_blk_hdr) <= v15bp->bsiz) || (UPGRADE_ALWAYS == gtm_blkupgrade_flag));
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UNIX_ONLY(v15tn = v15bp->tn);
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VMS_ONLY(GET_ULONG(v15tn, &v15bp->tn));
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v15bsiz = v15bp->bsiz;
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if (v15bsiz > blksize) /* Exceeds maximum block size. Not a valid V4 block. Return without upgrading */
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{
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assert(UPGRADE_NEVER != gtm_blkupgrade_flag);
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if (UPGRADE_IF_NEEDED == gtm_blkupgrade_flag)
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{
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if (NULL != ondsk_blkver)
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*ondsk_blkver = GDSV5;
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return SS_NORMAL;
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} else
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{
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if (NULL != ondsk_blkver)
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*ondsk_blkver = GDSV4;
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return ERR_DYNUPGRDFAIL;
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}
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}
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if (NULL != ondsk_blkver)
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*ondsk_blkver = GDSV4;
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v15bsiz += SPACE_NEEDED;
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if (v15bsiz > blksize) /* Exceeds maximum block size */
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return ERR_DYNUPGRDFAIL;
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v15levl = v15bp->levl;
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memmove((gds_blk_trg + SPACE_NEEDED), gds_blk_src, v15bp->bsiz); /* Shift/copy block requisite amount */
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bp->tn = v15tn;
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bp->bsiz = v15bsiz;
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bp->levl = v15levl;
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bp->bver = GDSV5;
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return SS_NORMAL;
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}
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