db2/btree/bt_close.c

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1996, 1997
   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    10.25 (Sleepycat) 1/6/98";
  51 #endif /* not lint */
  52
  53 #ifndef NO_SYSTEM_INCLUDES
  54 #include <sys/types.h>
  55 #include <sys/mman.h>
  56
  57 #include <errno.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62 #endif
  63
  64 #include "db_int.h"
  65 #include "db_page.h"
  66 #include "btree.h"
  67
  68 static void __bam_upstat __P((DB *dbp));
  69
  70 /*
  71  * __bam_close --
  72  *      Close a btree.
  73  *
  74  * PUBLIC: int __bam_close __P((DB *));
  75  */
  76 int
  77 __bam_close(dbp)
  78         DB *dbp;
  79 {
  80         BTREE *t;
  81
  82         DEBUG_LWRITE(dbp, NULL, "bam_close", NULL, NULL, 0);
  83
  84         t = dbp->internal;
  85
  86         /* Update tree statistics. */
  87         __bam_upstat(dbp);
  88
  89         /* Free any allocated memory. */
  90         if (t->bt_rkey.data)
  91                 FREE(t->bt_rkey.data, t->bt_rkey.size);
  92         if (t->bt_rdata.data)
  93                 FREE(t->bt_rdata.data, t->bt_rdata.ulen);
  94         if (t->bt_sp != t->bt_stack)
  95                 FREE(t->bt_sp, (t->bt_esp - t->bt_sp) * sizeof(EPG));
  96
  97         FREE(t, sizeof(BTREE));
  98         dbp->internal = NULL;
  99
 100         return (0);
 101 }
 102
 103 /*
 104  * __bam_sync --
 105  *      Sync the btree to disk.
 106  *
 107  * PUBLIC: int __bam_sync __P((DB *, int));
 108  */
 109 int
 110 __bam_sync(argdbp, flags)
 111         DB *argdbp;
 112         int flags;
 113 {
 114         DB *dbp;
 115         int ret;
 116
 117         DEBUG_LWRITE(argdbp, NULL, "bam_sync", NULL, NULL, flags);
 118
 119         /* Check for invalid flags. */
 120         if ((ret = __db_syncchk(argdbp, flags)) != 0)
 121                 return (ret);
 122
 123         /* If it wasn't possible to modify the file, we're done. */
 124         if (F_ISSET(argdbp, DB_AM_INMEM | DB_AM_RDONLY))
 125                 return (0);
 126
 127         GETHANDLE(argdbp, NULL, &dbp, ret);
 128
 129         /* Flush any dirty pages from the cache to the backing file. */
 130         if ((ret = memp_fsync(dbp->mpf)) == DB_INCOMPLETE)
 131                 ret = 0;
 132
 133         PUTHANDLE(dbp);
 134         return (ret);
 135 }
 136
 137 /*
 138  * __bam_upstat --
 139  *      Update tree statistics.
 140  */
 141 static void
 142 __bam_upstat(dbp)
 143         DB *dbp;
 144 {
 145         BTREE *t;
 146         BTMETA *meta;
 147         DB_LOCK metalock;
 148         db_pgno_t pgno;
 149         int flags, ret;
 150
 151         /*
 152          * We use a no-op log call to log the update of the statistics onto the
 153          * metadata page.  The Db->close call isn't transaction protected to
 154          * start with, and I'm not sure what undoing a statistics update means,
 155          * anyway.
 156          */
 157         if (F_ISSET(dbp, DB_AM_INMEM | DB_AM_RDONLY))
 158                 return;
 159
 160         flags = 0;
 161         pgno = PGNO_METADATA;
 162
 163         /* Lock and retrieve the page. */
 164         if (__bam_lget(dbp, 0, pgno, DB_LOCK_WRITE, &metalock) != 0)
 165                 return;
 166         if (__bam_pget(dbp, (PAGE **)&meta, &pgno, 0) == 0) {
 167                 /* Log the change. */
 168                 if (DB_LOGGING(dbp) &&
 169                     (ret = __db_noop_log(dbp->dbenv->lg_info, dbp->txn,
 170                     &LSN(meta), 0)) == 0)
 171                         goto err;
 172
 173                 /* Update the statistics. */
 174                 t = dbp->internal;
 175                 __bam_add_mstat(&t->lstat, &meta->stat);
 176
 177                 flags = DB_MPOOL_DIRTY;
 178         }
 179
 180 err:    (void)memp_fput(dbp->mpf, (PAGE *)meta, flags);
 181         (void)__BT_LPUT(dbp, metalock);
 182 }