db2/btree/bt_close.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 /*
   8  * Copyright (c) 1990, 1993, 1994, 1995, 1996
   9  *      Keith Bostic.  All rights reserved.
  10  */
  11 /*
  12  * Copyright (c) 1990, 1993, 1994, 1995
  13  *      The Regents of the University of California.  All rights reserved.
  14  *
  15  * This code is derived from software contributed to Berkeley by
  16  * Mike Olson.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  * 3. All advertising materials mentioning features or use of this software
  27  *    must display the following acknowledgement:
  28  *      This product includes software developed by the University of
  29  *      California, Berkeley and its contributors.
  30  * 4. Neither the name of the University nor the names of its contributors
  31  *    may be used to endorse or promote products derived from this software
  32  *    without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  35  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  36  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  37  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  38  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  39  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  40  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  41  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  42  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  43  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  44  * SUCH DAMAGE.
  45  */
  46
  47 #include "config.h"
  48
  49 #ifndef lint
  50 static const char sccsid[] = "@(#)bt_close.c    10.32 (Sleepycat) 5/6/98";
  51 #endif /* not lint */
  52
  53 #ifndef NO_SYSTEM_INCLUDES
  54 #include <sys/types.h>
  55
  56 #include <string.h>
  57 #endif
  58
  59 #include "db_int.h"
  60 #include "db_page.h"
  61 #include "btree.h"
  62
  63 static void __bam_upstat __P((DB *dbp));
  64
  65 /*
  66  * __bam_close --
  67  *      Close a btree.
  68  *
  69  * PUBLIC: int __bam_close __P((DB *));
  70  */
  71 int
  72 __bam_close(dbp)
  73         DB *dbp;
  74 {
  75         BTREE *t;
  76
  77         DEBUG_LWRITE(dbp, NULL, "bam_close", NULL, NULL, 0);
  78
  79         t = dbp->internal;
  80
  81         /* Update tree statistics. */
  82         __bam_upstat(dbp);
  83
  84         /* Free any allocated memory. */
  85         if (t->bt_rkey.data)
  86                 FREE(t->bt_rkey.data, t->bt_rkey.size);
  87         if (t->bt_rdata.data)
  88                 FREE(t->bt_rdata.data, t->bt_rdata.ulen);
  89         if (t->bt_sp != t->bt_stack)
  90                 FREE(t->bt_sp, (t->bt_esp - t->bt_sp) * sizeof(EPG));
  91
  92         FREE(t, sizeof(BTREE));
  93         dbp->internal = NULL;
  94
  95         return (0);
  96 }
  97
  98 /*
  99  * __bam_sync --
 100  *      Sync the btree to disk.
 101  *
 102  * PUBLIC: int __bam_sync __P((DB *, u_int32_t));
 103  */
 104 int
 105 __bam_sync(argdbp, flags)
 106         DB *argdbp;
 107         u_int32_t flags;
 108 {
 109         DB *dbp;
 110         int ret;
 111
 112         DEBUG_LWRITE(argdbp, NULL, "bam_sync", NULL, NULL, flags);
 113
 114         /* Check for invalid flags. */
 115         if ((ret = __db_syncchk(argdbp, flags)) != 0)
 116                 return (ret);
 117
 118         /* If it wasn't possible to modify the file, we're done. */
 119         if (F_ISSET(argdbp, DB_AM_INMEM | DB_AM_RDONLY))
 120                 return (0);
 121
 122         GETHANDLE(argdbp, NULL, &dbp, ret);
 123
 124         /* Flush any dirty pages from the cache to the backing file. */
 125         if ((ret = memp_fsync(dbp->mpf)) == DB_INCOMPLETE)
 126                 ret = 0;
 127
 128         PUTHANDLE(dbp);
 129         return (ret);
 130 }
 131
 132 /*
 133  * __bam_upstat --
 134  *      Update tree statistics.
 135  */
 136 static void
 137 __bam_upstat(dbp)
 138         DB *dbp;
 139 {
 140         BTREE *t;
 141         BTMETA *meta;
 142         DB_LOCK metalock;
 143         db_pgno_t pgno;
 144         u_int32_t flags;
 145
 146         /*
 147          * We use a no-op log call to log the update of the statistics onto the
 148          * metadata page.  The Db->close call isn't transaction protected to
 149          * start with, and I'm not sure what undoing a statistics update means,
 150          * anyway.
 151          */
 152         if (F_ISSET(dbp, DB_AM_INMEM | DB_AM_RDONLY))
 153                 return;
 154
 155         flags = 0;
 156         pgno = PGNO_METADATA;
 157
 158         /* Lock and retrieve the page. */
 159         if (__bam_lget(dbp, 0, pgno, DB_LOCK_WRITE, &metalock) != 0)
 160                 return;
 161         if (__bam_pget(dbp, (PAGE **)&meta, &pgno, 0) == 0) {
 162                 /* Log the change. */
 163                 if (DB_LOGGING(dbp) &&
 164                     __db_noop_log(dbp->dbenv->lg_info, dbp->txn, &LSN(meta), 0,
 165                     dbp->log_fileid, PGNO_METADATA, &LSN(meta)) != 0)
 166                         goto err;
 167
 168                 /* Update the statistics. */
 169                 t = dbp->internal;
 170                 __bam_add_mstat(&t->lstat, &meta->stat);
 171
 172                 flags = DB_MPOOL_DIRTY;
 173         }
 174
 175 err:    (void)memp_fput(dbp->mpf, (PAGE *)meta, flags);
 176         (void)__BT_LPUT(dbp, metalock);
 177 }