71 lines
2.8 KiB
C
71 lines
2.8 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2008 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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#ifdef UNIX
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#include <errno.h> /* for DSK_WRITE macro */
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#elif defined(VMS)
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#include "efn.h" /* for DSK_WRITE macro */
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#else
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#error UNSUPPORTED PLATFORM
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#endif
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#include "gdsroot.h"
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#include "gdsbt.h"
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#include "gdsblk.h"
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#include "gdsbml.h"
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#include "gtm_facility.h"
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#include "fileinfo.h"
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#include "gdsfhead.h"
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#include "filestruct.h"
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#include "jnl.h"
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GBLREF gd_region *gv_cur_region;
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GBLREF sgmnt_addrs *cs_addrs;
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GBLREF sgmnt_data_ptr_t cs_data;
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GBLREF jnl_gbls_t jgbl;
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int4 bml_init(block_id bml)
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{
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blk_hdr_ptr_t ptr;
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uint4 size;
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uint4 status;
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trans_num blktn;
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size = BM_SIZE(cs_data->bplmap);
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/* Allocate full block .. bml_newmap will set the write size, dsk_write will write part or all of it as appropriate. */
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ptr = (blk_hdr_ptr_t)malloc(cs_addrs->hdr->blk_size);
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/* We are about to create a local bitmap. Setting its block transaction number to the current database transaction
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* number gives us a clear history of when this bitmap got created. There are two exceptions.
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* 1) If before-image journaling, it implies the possibility of using backward recovery/rollback both of which can
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* take the database to a transaction number MUCH BEFORE the current database transaction number. In that case, the
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* recovered database will have DBTNTOOLG integrity errors since the bitmap block's transaction number will be greater
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* than the post-recovery database transaction number. Since we have no control over what transaction number backward
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* recovery can take the database to, we set the bitmap block transaction number to 0 (the least possible) for the
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* before-image journaling case.
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* 2) If in forward recovery, then the database current transaction number is not incremented in gdsfilext (the caller
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* of this function) so we have to create the local bitmap blocks with curr_tn-1 in order to avoid a DBTNTOOLG error.
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*/
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if (JNL_ENABLED(cs_data) && cs_addrs->jnl && cs_addrs->jnl->jnl_buff && cs_addrs->jnl->jnl_buff->before_images)
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blktn = 0;
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else if (jgbl.forw_phase_recovery && !JNL_ENABLED(cs_data)) /* forward recovery */
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blktn = cs_data->trans_hist.curr_tn - 1;
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else
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blktn = cs_data->trans_hist.curr_tn;
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bml_newmap(ptr, size, blktn);
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/* status holds the status of any error return from dsk_write */
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DSK_WRITE_NOCACHE(gv_cur_region, bml, (sm_uc_ptr_t)ptr, cs_data->desired_db_format, status);
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free(ptr);
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return status;
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}
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