db2/mp/mp_fset.c

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1996, 1997, 1998
   5  *      Sleepycat Software.  All rights reserved.
   6  */
   7 #include "config.h"
   8
   9 #ifndef lint
  10 static const char sccsid[] = "@(#)mp_fset.c     10.15 (Sleepycat) 4/26/98";
  11 #endif /* not lint */
  12
  13 #ifndef NO_SYSTEM_INCLUDES
  14 #include <sys/types.h>
  15
  16 #include <errno.h>
  17 #endif
  18
  19 #include "db_int.h"
  20 #include "shqueue.h"
  21 #include "db_shash.h"
  22 #include "mp.h"
  23 #include "common_ext.h"
  24
  25 /*
  26  * memp_fset --
  27  *      Mpool page set-flag routine.
  28  */
  29 int
  30 memp_fset(dbmfp, pgaddr, flags)
  31         DB_MPOOLFILE *dbmfp;
  32         void *pgaddr;
  33         u_int32_t flags;
  34 {
  35         BH *bhp;
  36         DB_MPOOL *dbmp;
  37         MPOOL *mp;
  38         int ret;
  39
  40         dbmp = dbmfp->dbmp;
  41         mp = dbmp->mp;
  42
  43         /* Validate arguments. */
  44         if (flags == 0)
  45                 return (__db_ferr(dbmp->dbenv, "memp_fset", 1));
  46
  47         if ((ret = __db_fchk(dbmp->dbenv, "memp_fset", flags,
  48             DB_MPOOL_DIRTY | DB_MPOOL_CLEAN | DB_MPOOL_DISCARD)) != 0)
  49                 return (ret);
  50         if ((ret = __db_fcchk(dbmp->dbenv, "memp_fset",
  51             flags, DB_MPOOL_CLEAN, DB_MPOOL_DIRTY)) != 0)
  52                 return (ret);
  53
  54         if (LF_ISSET(DB_MPOOL_DIRTY) && F_ISSET(dbmfp, MP_READONLY)) {
  55                 __db_err(dbmp->dbenv,
  56                     "%s: dirty flag set for readonly file page",
  57                     __memp_fn(dbmfp));
  58                 return (EACCES);
  59         }
  60
  61         /* Convert the page address to a buffer header. */
  62         bhp = (BH *)((u_int8_t *)pgaddr - SSZA(BH, buf));
  63
  64         LOCKREGION(dbmp);
  65
  66         if (LF_ISSET(DB_MPOOL_CLEAN) && F_ISSET(bhp, BH_DIRTY)) {
  67                 ++mp->stat.st_page_clean;
  68                 --mp->stat.st_page_dirty;
  69                 F_CLR(bhp, BH_DIRTY);
  70         }
  71         if (LF_ISSET(DB_MPOOL_DIRTY) && !F_ISSET(bhp, BH_DIRTY)) {
  72                 --mp->stat.st_page_clean;
  73                 ++mp->stat.st_page_dirty;
  74                 F_SET(bhp, BH_DIRTY);
  75         }
  76         if (LF_ISSET(DB_MPOOL_DISCARD))
  77                 F_SET(bhp, BH_DISCARD);
  78
  79         UNLOCKREGION(dbmp);
  80         return (0);
  81 }