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1997-08-10 19:17  Philip Blundell  <Philip.Blundell@pobox.com>

	* nss/nss_db/db-XXX.c: Include <db_185.h> not <db.h>.  Somebody
	should update this to use the new db API.
	* nss/nss_db/db-netgrp.c: Likewise.
	* nss/nss_db/db-alias.c: Likewise.
	* db2/Makefile: Makefile for db-2.x in glibc.

1997-08-27 21:20  Ulrich Drepper  <drepper@cygnus.com>

	* csu/Makefile (before-compile): New goal.  Make sure abi-tag.h
	is generated.
	[$(elf)=yes] (asm-CPPFLAGS): Make sure abi-tag.h file can be found.

	* Makeconfig [$(build-omitfp)=yes] (CFLAGS-.o): Add
	-D__USE_STRING_INLINES.
	* string/string.f: Move strnlen optimization after inclusion of
	<bits/string.h>.  Include <bits/string.h> only if __USE_STRING_INLINES
	is defined.
	* sysdeps/generic/memcpy.c: Undef memcpy to allow macro of this name
	in <bits/string.h>.
	* sysdeps/generic/memset.c: Likewise.
	* sysdeps/i386/string.h: i386 optimized string functions.
	* sysdeps/i386/i486string.h: i486+ optimized string functions.

	* Makefile (subdirs): Change db to db2.
	* shlib-versions: Bump libdb verion number to 3.
	* include/db.h: Include from db2 directory.
	* include/db_185.h: New file.
	* sysdeps/i386/Makefile [$(subdirs)=db2] (CPPFLAGS): Add macros
	to provide spinlock information for db2.
	* sysdeps/m68k/m68020/Makefile: New file.  Likewise.
	* sysdeps/sparc/Makefile: New file.  Likewise.
	* sysdeps/unix/sysv/linux/Makefile [$(subdirs)=db2] (CPPFLAGS):
	Add -DHAVE_LLSEEK.
	* db2/config.h: Hand-edited config file for db2 in glibc.
	* db2/compat.h: New file from db-2.3.4.
	* db2/db.h: Likewise.
	* db2/db_185.h: Likewise.
	* db2/db_int.h: Likewise.
	* db2/makedb.c: Likewise.
	* db2/btree/bt_close.c: Likewise.
	* db2/btree/bt_compare.c: Likewise.
	* db2/btree/bt_conv.c: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_page.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.c: Likewise.
	* db2/btree/btree_auto.c: Likewise.
	* db2/btree/bt_rsearch.c: Likewise.
	* db2/btree/bt_search.c: Likewise.
	* db2/btree/bt_split.c: Likewise.
	* db2/btree/bt_stat.c: Likewise.
	* db2/btree/btree.src: Likewise.
	* db2/common/db_appinit.c: Likewise.
	* db2/common/db_err.c: Likewise.
	* db2/common/db_byteorder.c: Likewise.
	* db2/common/db_apprec.c: Likewise.
	* db2/common/db_salloc.c: Likewise.
	* db2/common/db_log2.c: Likewise.
	* db2/common/db_region.c: Likewise.
	* db2/common/db_shash.c: Likewise.
	* db2/db/db.c: Likewise.
	* db2/db/db.src: Likewise.
	* db2/db/db_conv.c: Likewise.
	* db2/db/db_dispatch.c: Likewise.
	* db2/db/db_dup.c: Likewise.
	* db2/db/db_overflow.c: Likewise.
	* db2/db/db_pr.c: Likewise.
	* db2/db/db_rec.c: Likewise.
	* db2/db/db_ret.c: Likewise.
	* db2/db/db_thread.c: Likewise.
	* db2/db/db_auto.c: Likewise.
	* db2/db185/db185.c: Likewise.
	* db2/db185/db185_int.h: Likewise.
	* db2/dbm/dbm.c: Likewise.
	* db2/hash/hash.c: Likewise.
	* db2/hash/hash.src: Likewise.
	* db2/hash/hash_page.c: Likewise.
	* db2/hash/hash_conv.c: Likewise.
	* db2/hash/hash_debug.c: Likewise.
	* db2/hash/hash_stat.c: Likewise.
	* db2/hash/hash_rec.c: Likewise.
	* db2/hash/hash_dup.c: Likewise.
	* db2/hash/hash_func.c: Likewise.
	* db2/hash/hash_auto.c: Likewise.
	* db2/include/mp.h: Likewise.
	* db2/include/btree.h: Likewise.
	* db2/include/db.h.src: Likewise.
	* db2/include/db_int.h.src: Likewise.
	* db2/include/db_shash.h: Likewise.
	* db2/include/db_swap.h: Likewise.
	* db2/include/db_185.h.src: Likewise.
	* db2/include/txn.h: Likewise.
	* db2/include/db_am.h: Likewise.
	* db2/include/shqueue.h: Likewise.
	* db2/include/hash.h: Likewise.
	* db2/include/db_dispatch.h: Likewise.
	* db2/include/lock.h: Likewise.
	* db2/include/db_page.h: Likewise.
	* db2/include/log.h: Likewise.
	* db2/include/db_auto.h: Likewise.
	* db2/include/btree_auto.h: Likewise.
	* db2/include/hash_auto.h: Likewise.
	* db2/include/log_auto.h: Likewise.
	* db2/include/txn_auto.h: Likewise.
	* db2/include/db_ext.h: Likewise.
	* db2/include/btree_ext.h: Likewise.
	* db2/include/clib_ext.h: Likewise.
	* db2/include/common_ext.h: Likewise.
	* db2/include/hash_ext.h: Likewise.
	* db2/include/lock_ext.h: Likewise.
	* db2/include/log_ext.h: Likewise.
	* db2/include/mp_ext.h: Likewise.
	* db2/include/mutex_ext.h: Likewise.
	* db2/include/os_ext.h: Likewise.
	* db2/include/txn_ext.h: Likewise.
	* db2/include/cxx_int.h: Likewise.
	* db2/include/db_cxx.h: Likewise.
	* db2/include/queue.h: Likewise.
	* db2/lock/lock.c: Likewise.
	* db2/lock/lock_conflict.c: Likewise.
	* db2/lock/lock_util.c: Likewise.
	* db2/lock/lock_deadlock.c: Likewise.
	* db2/log/log.c: Likewise.
	* db2/log/log_get.c: Likewise.
	* db2/log/log.src: Likewise.
	* db2/log/log_compare.c: Likewise.
	* db2/log/log_put.c: Likewise.
	* db2/log/log_rec.c: Likewise.
	* db2/log/log_archive.c: Likewise.
	* db2/log/log_register.c: Likewise.
	* db2/log/log_auto.c: Likewise.
	* db2/log/log_findckp.c: Likewise.
	* db2/mp/mp_bh.c: Likewise.
	* db2/mp/mp_fget.c: Likewise.
	* db2/mp/mp_fopen.c: Likewise.
	* db2/mp/mp_fput.c: Likewise.
	* db2/mp/mp_fset.c: Likewise.
	* db2/mp/mp_open.c: Likewise.
	* db2/mp/mp_region.c: Likewise.
	* db2/mp/mp_pr.c: Likewise.
	* db2/mp/mp_sync.c: Likewise.
	* db2/mutex/68020.gcc: Likewise.
	* db2/mutex/mutex.c: Likewise.
	* db2/mutex/README: Likewise.
	* db2/mutex/x86.gcc: Likewise.
	* db2/mutex/sparc.gcc: Likewise.
	* db2/mutex/uts4.cc.s: Likewise.
	* db2/mutex/alpha.dec: Likewise.
	* db2/mutex/alpha.gcc: Likewise.
	* db2/mutex/parisc.gcc: Likewise.
	* db2/mutex/parisc.hp: Likewise.
	* db2/os/db_os_abs.c: Likewise.
	* db2/os/db_os_dir.c: Likewise.
	* db2/os/db_os_fid.c: Likewise.
	* db2/os/db_os_lseek.c: Likewise.
	* db2/os/db_os_mmap.c: Likewise.
	* db2/os/db_os_open.c: Likewise.
	* db2/os/db_os_rw.c: Likewise.
	* db2/os/db_os_sleep.c: Likewise.
	* db2/os/db_os_stat.c: Likewise.
	* db2/os/db_os_unlink.c: Likewise.
	* db2/txn/txn.c: Likewise.
	* db2/txn/txn.src: Likewise.
	* db2/txn/txn_rec.c: Likewise.
	* db2/txn/txn_auto.c: Likewise.
	* db2/clib/getlong.c: Likewise.
	* db2/progs/db_archive/db_archive.c: Likewise.
	* db2/progs/db_checkpoint/db_checkpoint.c: Likewise.
	* db2/progs/db_deadlock/db_deadlock.c: Likewise.
	* db2/progs/db_dump/db_dump.c: Likewise.
	* db2/progs/db_dump185/db_dump185.c: Likewise.
	* db2/progs/db_load/db_load.c: Likewise.
	* db2/progs/db_printlog/db_printlog.c: Likewise.
	* db2/progs/db_recover/db_recover.c: Likewise.
	* db2/progs/db_stat/db_stat.c: Likewise.

	* libio/stdio.h [__cplusplus] (__STDIO_INLINE): Define as inline.

	* po/de.po, po/sv.po: Update from 2.0.5 translations.

	* sysdeps/unix/sysv/linux/netinet/tcp.h: Pretty print.

	* sunrpc/rpc/xdr.h (XDR): Don't define argument of x_destroy callback
	as const.
	* sunrpc/xdr_mem.c (xdrmem_destroy): Don't define argument as const.
	* sunrpx/xdr_rec.c (xdrrec_destroy): Likewise.
	* sunrpx/xdr_stdio.c (xdrstdio_destroy): Likewise.

1997-08-27 18:47  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/if_index.c: Include <errno.h>.
	Reported by Benjamin Kosnik <bkoz@cygnus.com>.

1997-08-27 02:27  Roland McGrath  <roland@baalperazim.frob.com>

	* abi-tags: New file.
	* csu/Makefile (distribute): Remove abi-tag.h.
	($(objpfx)abi-tag.h): New target.
	* Makefile (distribute): Add abi-tags.
	* sysdeps/unix/sysv/linux/abi-tag.h: File removed.
	* sysdeps/mach/hurd/abi-tag.h: File removed.
	* sysdeps/stub/abi-tag.h: File removed.

1997-08-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/make-syscalls.sh: Change output so that it
	generates compilation rules only for the currently selected object
	suffixes.

1997-08-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/dl-machine.h (RTLD_START): Switch back to previous
	section to avoid confusing the compiler.
	* sysdeps/alpha/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/i386/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/mips/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/mips/mips64/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/sparc/sparc32/dl-machine.h (RTLD_START): Likewise.

	* sysdeps/m68k/dl-machine.h (elf_machine_load_address): Use a GOT
	relocation instead of a constant to avoid text relocation.
	(ELF_MACHINE_BEFORE_RTLD_RELOC): Removed.
	(RTLD_START): Declare global labels as functions and add size
	directive.

1997-08-25 17:01  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/i386/bits/select.h: Correct assembler versions to work even
	for descriptors >= 32.

	* stdlib/alloca.h: Don't define alloca to __alloca since if gcc
	is used __alloca is not defined to __builtin_alloca and so might
	not be available.
	Reported by Uwe Ohse <uwe@ohse.de>.

	* sysdeps/unix/sysv/linux/sys/sysmacros.h: Define macros in a special
	way if gcc is not used and so dev_t is an array.
	Reported by Uwe Ohse <uwe@ohse.de>.

1997-08-23  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/libc.texinfo: Reorder chapters to match logical order.

1997-08-25 12:22  Ulrich Drepper  <drepper@cygnus.com>

	* sunrpc/rpc/xdr.h: Change name of parameters in prototypes of
	xdr_reference, xdrmem_create, and xdrstdio_create because of clash
	with g++ internal symbols.
	Patch by Sudish Joseph <sj@eng.mindspring.net>.

	* elf/dl-deps.c: Implement handling of DT_FILTER.
This commit is contained in:
Ulrich Drepper
1997-08-27 20:26:10 +00:00
parent 22be878ecb
commit 92f1da4da0
192 changed files with 48405 additions and 485 deletions
Download Patch File Download Diff File Expand all files Collapse all files

184
db2/btree/bt_close.c Normal file
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@ -0,0 +1,184 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_close.c 10.22 (Sleepycat) 8/23/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
static void __bam_upstat __P((DB *dbp));
/*
* __bam_close --
* Close a btree.
*
* PUBLIC: int __bam_close __P((DB *));
*/
int
__bam_close(dbp)
DB *dbp;
{
BTREE *t;
DEBUG_LWRITE(dbp, NULL, "bam_close", NULL, NULL, 0);
t = dbp->internal;
/* Update tree statistics. */
__bam_upstat(dbp);
/* Free any allocated memory. */
if (t->bt_rkey.data)
FREE(t->bt_rkey.data, t->bt_rkey.size);
if (t->bt_rdata.data)
FREE(t->bt_rdata.data, t->bt_rdata.ulen);
if (t->bt_sp != t->bt_stack)
FREE(t->bt_sp, (t->bt_esp - t->bt_sp) * sizeof(EPG));
FREE(t, sizeof(BTREE));
dbp->internal = NULL;
return (0);
}
/*
* __bam_sync --
* Sync the btree to disk.
*
* PUBLIC: int __bam_sync __P((DB *, int));
*/
int
__bam_sync(argdbp, flags)
DB *argdbp;
int flags;
{
DB *dbp;
int ret;
DEBUG_LWRITE(argdbp, NULL, "bam_sync", NULL, NULL, flags);
/* Check for invalid flags. */
if ((ret = __db_syncchk(argdbp, flags)) != 0)
return (ret);
/* If it wasn't possible to modify the file, we're done. */
if (F_ISSET(argdbp, DB_AM_INMEM | DB_AM_RDONLY))
return (0);
GETHANDLE(argdbp, NULL, &dbp, ret);
/* Flush any dirty pages from the cache to the backing file. */
if ((ret = memp_fsync(dbp->mpf)) == DB_INCOMPLETE)
ret = 0;
PUTHANDLE(dbp);
return (ret);
}
/*
* __bam_upstat --
* Update tree statistics.
*/
static void
__bam_upstat(dbp)
DB *dbp;
{
BTREE *t;
BTMETA *meta;
DB_LOCK mlock;
db_pgno_t pgno;
int flags, ret;
/*
* We use a no-op log call to log the update of the statistics onto the
* metadata page. The dbp->close() call isn't transaction protected to
* start with, and I'm not sure what undoing a statistics update means,
* anyway.
*/
if (F_ISSET(dbp, DB_AM_INMEM | DB_AM_RDONLY))
return;
/* Lock the page. */
if (__bam_lget(dbp, 0, pgno, DB_LOCK_WRITE, &mlock) != 0)
return;
flags = 0;
pgno = PGNO_METADATA;
/* Get the page. */
if (__bam_pget(dbp, (PAGE **)&meta, &pgno, 0) == 0) {
/* Log the change. */
if (DB_LOGGING(dbp) &&
(ret = __db_noop_log(dbp->dbenv->lg_info, dbp->txn,
&LSN(meta), 0)) == 0)
goto err;
/* Update the statistics. */
t = dbp->internal;
__bam_add_mstat(&t->lstat, &meta->stat);
flags = DB_MPOOL_DIRTY;
}
err: (void)memp_fput(dbp->mpf, (PAGE *)meta, flags);
(void)__BT_LPUT(dbp, mlock);
}

205
db2/btree/bt_compare.c Normal file
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@ -0,0 +1,205 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_compare.c 10.3 (Sleepycat) 7/19/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
/*
* __bam_cmp --
* Compare a key to a given record.
*
* PUBLIC: int __bam_cmp __P((DB *, const DBT *, EPG *));
*/
int
__bam_cmp(dbp, k1, e)
DB *dbp;
const DBT *k1;
EPG *e;
{
BINTERNAL *bi;
BKEYDATA *bk;
BOVERFLOW *bo;
BTREE *t;
DBT k2;
PAGE *h;
t = dbp->internal;
/*
* Returns:
* < 0 if k1 is < record
* = 0 if k1 is = record
* > 0 if k1 is > record
*
* The left-most key on internal pages, at any level of the tree, is
* guaranteed, by the following code, to be less than any user key.
* This saves us from having to update the leftmost key on an internal
* page when the user inserts a new key in the tree smaller than
* anything we've yet seen.
*/
h = e->page;
if (e->indx == 0 &&
h->prev_pgno == PGNO_INVALID && TYPE(h) != P_LBTREE)
return (1);
bo = NULL;
if (TYPE(h) == P_LBTREE) {
bk = GET_BKEYDATA(h, e->indx);
if (bk->type == B_OVERFLOW)
bo = (BOVERFLOW *)bk;
else {
memset(&k2, 0, sizeof(k2));
k2.data = bk->data;
k2.size = bk->len;
}
} else {
bi = GET_BINTERNAL(h, e->indx);
if (bi->type == B_OVERFLOW)
bo = (BOVERFLOW *)(bi->data);
else {
memset(&k2, 0, sizeof(k2));
k2.data = bi->data;
k2.size = bi->len;
}
}
/*
* XXX
* We ignore system errors; the only recoverable one is ENOMEM, and we
* don't want to require that comparison routines handle random errors.
* We don't want to return a valid comparison, either, so we stop.
*/
if (bo != NULL) {
/*
* If using the default comparison routine, use __db_moff(),
* which compares the overflow key a page at a time.
*/
if (t->bt_compare == __bam_defcmp)
return (__db_moff(dbp, k1, bo->pgno));
/*
* Otherwise, we need a contiguous record so we can hand it
* to the user's routine.
*/
if (__db_goff(dbp, &k2, bo->tlen,
bo->pgno, &t->bt_rdata.data, &t->bt_rdata.ulen) != 0)
abort();
}
return ((*t->bt_compare)(k1, &k2));
}
/*
* __bam_defcmp --
* Default comparison routine.
*
* PUBLIC: int __bam_defcmp __P((const DBT *, const DBT *));
*/
int
__bam_defcmp(a, b)
const DBT *a, *b;
{
size_t len;
u_int8_t *p1, *p2;
/*
* Returns:
* < 0 if a is < b
* = 0 if a is = b
* > 0 if a is > b
*
* XXX
* If a size_t doesn't fit into a long, or if the difference between
* any two characters doesn't fit into an int, this routine can lose.
* What we need is a signed integral type that's guaranteed to be at
* least as large as a size_t, and there is no such thing.
*/
len = a->size > b->size ? b->size : a->size;
for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2)
if (*p1 != *p2)
return ((long)*p1 - (long)*p2);
return ((long)a->size - (long)b->size);
}
/*
* __bam_defpfx --
* Default prefix routine.
*
* PUBLIC: size_t __bam_defpfx __P((const DBT *, const DBT *));
*/
size_t
__bam_defpfx(a, b)
const DBT *a, *b;
{
size_t cnt, len;
u_int8_t *p1, *p2;
cnt = 1;
len = a->size > b->size ? b->size : a->size;
for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2, ++cnt)
if (*p1 != *p2)
return (cnt);
/*
* We know that a->size must be <= b->size, or they wouldn't be
* in this order.
*/
return (a->size < b->size ? a->size + 1 : a->size);
}

83
db2/btree/bt_conv.c Normal file
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@ -0,0 +1,83 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_conv.c 10.3 (Sleepycat) 8/9/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "db_swap.h"
#include "btree.h"
/*
* __bam_pgin, __bam_pgout --
* Convert host-specific page layout to/from the host-independent
* format stored on disk.
*
* PUBLIC: int __bam_pgin __P((db_pgno_t, void *, DBT *));
* PUBLIC: int __bam_pgout __P((db_pgno_t, void *, DBT *));
*/
int
__bam_pgin(pg, pp, cookie)
db_pgno_t pg;
void *pp;
DBT *cookie;
{
DB_PGINFO *pginfo;
pginfo = (DB_PGINFO *)cookie->data;
if (!pginfo->needswap)
return (0);
return (pg == PGNO_METADATA ? __bam_mswap(pp) : __db_pgin(pg, pp));
}
int
__bam_pgout(pg, pp, cookie)
db_pgno_t pg;
void *pp;
DBT *cookie;
{
DB_PGINFO *pginfo;
pginfo = (DB_PGINFO *)cookie->data;
if (!pginfo->needswap)
return (0);
return (pg == PGNO_METADATA ? __bam_mswap(pp) : __db_pgout(pg, pp));
}
/*
* __bam_mswap --
* Swap the bytes on the btree metadata page.
*
* PUBLIC: int __bam_mswap __P((PAGE *));
*/
int
__bam_mswap(pg)
PAGE *pg;
{
u_int8_t *p;
p = (u_int8_t *)pg;
SWAP32(p); /* lsn.file */
SWAP32(p); /* lsn.offset */
SWAP32(p); /* pgno */
SWAP32(p); /* magic */
SWAP32(p); /* version */
SWAP32(p); /* pagesize */
SWAP32(p); /* maxkey */
SWAP32(p); /* minkey */
SWAP32(p); /* free */
SWAP32(p); /* flags */
return (0);
}

1577
db2/btree/bt_cursor.c Normal file
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607
db2/btree/bt_delete.c Normal file
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@ -0,0 +1,607 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_delete.c 10.18 (Sleepycat) 8/24/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
static int __bam_dpages __P((DB *, BTREE *));
/*
* __bam_delete --
* Delete the items referenced by a key.
*
* PUBLIC: int __bam_delete __P((DB *, DB_TXN *, DBT *, int));
*/
int
__bam_delete(argdbp, txn, key, flags)
DB *argdbp;
DB_TXN *txn;
DBT *key;
int flags;
{
BTREE *t;
DB *dbp;
PAGE *h;
db_indx_t cnt, i, indx;
int dpage, exact, ret, stack;
DEBUG_LWRITE(argdbp, txn, "bam_delete", key, NULL, flags);
stack = 0;
/* Check for invalid flags. */
if ((ret =
__db_delchk(argdbp, flags, F_ISSET(argdbp, DB_AM_RDONLY))) != 0)
return (ret);
GETHANDLE(argdbp, txn, &dbp, ret);
t = dbp->internal;
/* Search the tree for the key; delete only deletes exact matches. */
if ((ret = __bam_search(dbp, key, S_DELETE, 1, NULL, &exact)) != 0)
goto err;
stack = 1;
h = t->bt_csp->page;
indx = t->bt_csp->indx;
/* Delete the key/data pair, including any duplicates. */
for (cnt = 1, i = indx;; ++cnt)
if ((i += P_INDX) >= NUM_ENT(h) || h->inp[i] != h->inp[indx])
break;
for (; cnt > 0; --cnt, ++t->lstat.bt_deleted)
if (__bam_ca_delete(dbp, h->pgno, indx, NULL) != 0) {
GET_BKEYDATA(h, indx + O_INDX)->deleted = 1;
indx += P_INDX;
} else if ((ret = __bam_ditem(dbp, h, indx)) != 0 ||
(ret = __bam_ditem(dbp, h, indx)) != 0)
goto err;
/* If we're using record numbers, update internal page record counts. */
if (F_ISSET(dbp, DB_BT_RECNUM) && (ret = __bam_adjust(dbp, t, -1)) != 0)
goto err;
/* If the page is now empty, delete it. */
dpage = NUM_ENT(h) == 0 && h->pgno != PGNO_ROOT;
__bam_stkrel(dbp);
stack = 0;
ret = dpage ? __bam_dpage(dbp, key) : 0;
err: if (stack)
__bam_stkrel(dbp);
PUTHANDLE(dbp);
return (ret);
}
/*
* __ram_delete --
* Delete the items referenced by a key.
*
* PUBLIC: int __ram_delete __P((DB *, DB_TXN *, DBT *, int));
*/
int
__ram_delete(argdbp, txn, key, flags)
DB *argdbp;
DB_TXN *txn;
DBT *key;
int flags;
{
BKEYDATA bk;
BTREE *t;
DB *dbp;
DBT hdr, data;
PAGE *h;
db_indx_t indx;
db_recno_t recno;
int exact, ret, stack;
stack = 0;
/* Check for invalid flags. */
if ((ret =
__db_delchk(argdbp, flags, F_ISSET(argdbp, DB_AM_RDONLY))) != 0)
return (ret);
GETHANDLE(argdbp, txn, &dbp, ret);
t = dbp->internal;
/* Check the user's record number and fill in as necessary. */
if ((ret = __ram_getno(argdbp, key, &recno, 0)) != 0)
goto err;
/* Search the tree for the key; delete only deletes exact matches. */
if ((ret = __bam_rsearch(dbp, &recno, S_DELETE, 1, &exact)) != 0)
goto err;
if (!exact) {
ret = DB_NOTFOUND;
goto err;
}
h = t->bt_csp->page;
indx = t->bt_csp->indx;
stack = 1;
/* If the record has already been deleted, we couldn't have found it. */
if (GET_BKEYDATA(h, indx)->deleted) {
ret = DB_KEYEMPTY;
goto done;
}
/*
* If we're not renumbering records, replace the record with a marker
* and return.
*/
if (!F_ISSET(dbp, DB_RE_RENUMBER)) {
if ((ret = __bam_ditem(dbp, h, indx)) != 0)
goto err;
bk.deleted = 1;
bk.type = B_KEYDATA;
bk.len = 0;
memset(&hdr, 0, sizeof(hdr));
hdr.data = &bk;
hdr.size = SSZA(BKEYDATA, data);
memset(&data, 0, sizeof(data));
data.data = (char *) "";
data.size = 0;
if ((ret = __db_pitem(dbp,
h, indx, BKEYDATA_SIZE(0), &hdr, &data)) != 0)
goto err;
++t->lstat.bt_deleted;
goto done;
}
/* Delete the item. */
if ((ret = __bam_ditem(dbp, h, indx)) != 0)
goto err;
++t->lstat.bt_deleted;
if (t->bt_recno != NULL)
F_SET(t->bt_recno, RECNO_MODIFIED);
/* Adjust the counts. */
__bam_adjust(dbp, t, -1);
/* Adjust the cursors. */
__ram_ca(dbp, recno, CA_DELETE);
/*
* If the page is now empty, delete it -- we have the whole tree
* locked, so there are no preparations to make. Else, release
* the pages.
*/
if (NUM_ENT(h) == 0 && h->pgno != PGNO_ROOT) {
stack = 0;
ret = __bam_dpages(dbp, t);
}
done:
err: if (stack)
__bam_stkrel(dbp);
PUTHANDLE(dbp);
return (ret);
}
/*
* __bam_ditem --
* Delete one or more entries from a page.
*
* PUBLIC: int __bam_ditem __P((DB *, PAGE *, u_int32_t));
*/
int
__bam_ditem(dbp, h, indx)
DB *dbp;
PAGE *h;
u_int32_t indx;
{
BINTERNAL *bi;
BKEYDATA *bk;
BOVERFLOW *bo;
u_int32_t nbytes;
int ret;
switch (TYPE(h)) {
case P_IBTREE:
bi = GET_BINTERNAL(h, indx);
switch (bi->type) {
case B_DUPLICATE:
case B_OVERFLOW:
nbytes = BINTERNAL_SIZE(bi->len);
goto offpage;
case B_KEYDATA:
nbytes = BKEYDATA_SIZE(bi->len);
break;
default:
return (__db_pgfmt(dbp, h->pgno));
}
break;
case P_IRECNO:
nbytes = RINTERNAL_SIZE;
break;
case P_LBTREE:
/*
* If it's a duplicate key, discard the index and don't touch
* the actual page item. This works because no data item can
* have an index that matches any other index so even if the
* data item is in an index "slot", it won't match any other
* index.
*/
if (!(indx % 2)) {
if (indx > 0 && h->inp[indx] == h->inp[indx - P_INDX])
return (__bam_adjindx(dbp,
h, indx, indx - P_INDX, 0));
if (indx < (u_int32_t)(NUM_ENT(h) - P_INDX) &&
h->inp[indx] == h->inp[indx + P_INDX])
return (__bam_adjindx(dbp,
h, indx, indx + O_INDX, 0));
}
/* FALLTHROUGH */
case P_LRECNO:
bk = GET_BKEYDATA(h, indx);
switch (bk->type) {
case B_DUPLICATE:
case B_OVERFLOW:
nbytes = BOVERFLOW_SIZE;
offpage: /* Delete duplicate/offpage chains. */
bo = GET_BOVERFLOW(h, indx);
if (bo->type == B_DUPLICATE) {
if ((ret =
__db_ddup(dbp, bo->pgno, __bam_free)) != 0)
return (ret);
} else
if ((ret =
__db_doff(dbp, bo->pgno, __bam_free)) != 0)
return (ret);
break;
case B_KEYDATA:
nbytes = BKEYDATA_SIZE(bk->len);
break;
default:
return (__db_pgfmt(dbp, h->pgno));
}
break;
default:
return (__db_pgfmt(dbp, h->pgno));
}
/* Delete the item. */
if ((ret = __db_ditem(dbp, h, indx, nbytes)) != 0)
return (ret);
/* Mark the page dirty. */
return (memp_fset(dbp->mpf, h, DB_MPOOL_DIRTY));
}
/*
* __bam_adjindx --
* Adjust an index on the page.
*
* PUBLIC: int __bam_adjindx __P((DB *, PAGE *, u_int32_t, u_int32_t, int));
*/
int
__bam_adjindx(dbp, h, indx, indx_copy, is_insert)
DB *dbp;
PAGE *h;
u_int32_t indx, indx_copy;
int is_insert;
{
db_indx_t copy;
int ret;
/* Log the change. */
if (DB_LOGGING(dbp) &&
(ret = __bam_adj_log(dbp->dbenv->lg_info, dbp->txn, &LSN(h),
0, dbp->log_fileid, PGNO(h), &LSN(h), indx, indx_copy,
(u_int32_t)is_insert)) != 0)
return (ret);
if (is_insert) {
copy = h->inp[indx_copy];
if (indx != NUM_ENT(h))
memmove(&h->inp[indx + O_INDX], &h->inp[indx],
sizeof(db_indx_t) * (NUM_ENT(h) - indx));
h->inp[indx] = copy;
++NUM_ENT(h);
} else {
--NUM_ENT(h);
if (indx != NUM_ENT(h))
memmove(&h->inp[indx], &h->inp[indx + O_INDX],
sizeof(db_indx_t) * (NUM_ENT(h) - indx));
}
/* Mark the page dirty. */
ret = memp_fset(dbp->mpf, h, DB_MPOOL_DIRTY);
/* Adjust the cursors. */
__bam_ca_di(dbp, h->pgno, indx, is_insert ? 1 : -1);
return (0);
}
/*
* __bam_dpage --
* Delete a page from the tree.
*
* PUBLIC: int __bam_dpage __P((DB *, const DBT *));
*/
int
__bam_dpage(dbp, key)
DB *dbp;
const DBT *key;
{
BTREE *t;
DB_LOCK lock;
PAGE *h;
db_pgno_t pgno;
int exact, level, ret;
ret = 0;
t = dbp->internal;
/*
* The locking protocol is that we acquire locks by walking down the
* tree, to avoid the obvious deadlocks.
*
* Call __bam_search to reacquire the empty leaf page, but this time
* get both the leaf page and it's parent, locked. Walk back up the
* tree, until we have the top pair of pages that we want to delete.
* Once we have the top page that we want to delete locked, lock the
* underlying pages and check to make sure they're still empty. If
* they are, delete them.
*/
for (level = LEAFLEVEL;; ++level) {
/* Acquire a page and its parent, locked. */
if ((ret =
__bam_search(dbp, key, S_WRPAIR, level, NULL, &exact)) != 0)
return (ret);
/*
* If we reach the root or the page isn't going to be empty
* when we delete one record, quit.
*/
h = t->bt_csp[-1].page;
if (h->pgno == PGNO_ROOT || NUM_ENT(h) != 1)
break;
/* Release the two locked pages. */
(void)memp_fput(dbp->mpf, t->bt_csp[-1].page, 0);
(void)__BT_TLPUT(dbp, t->bt_csp[-1].lock);
(void)memp_fput(dbp->mpf, t->bt_csp[0].page, 0);
(void)__BT_TLPUT(dbp, t->bt_csp[0].lock);
}
/*
* Leave the stack pointer one after the last entry, we may be about
* to push more items on the stack.
*/
++t->bt_csp;
/*
* t->bt_csp[-2].page is the top page, which we're not going to delete,
* and t->bt_csp[-1].page is the first page we are going to delete.
*
* Walk down the chain, acquiring the rest of the pages until we've
* retrieved the leaf page. If we find any pages that aren't going
* to be emptied by the delete, someone else added something while we
* were walking the tree, and we discontinue the delete.
*/
for (h = t->bt_csp[-1].page;;) {
if (ISLEAF(h)) {
if (NUM_ENT(h) != 0)
goto release;
break;
} else
if (NUM_ENT(h) != 1)
goto release;
/*
* Get the next page, write lock it and push it onto the stack.
* We know it's index 0, because it can only have one element.
*/
pgno = TYPE(h) == P_IBTREE ?
GET_BINTERNAL(h, 0)->pgno : GET_RINTERNAL(h, 0)->pgno;
if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_WRITE, &lock)) != 0)
goto release;
if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0)
goto release;
BT_STK_PUSH(t, h, 0, lock, ret);
if (ret != 0)
goto release;
}
BT_STK_POP(t);
return (__bam_dpages(dbp, t));
release:
/* Discard any locked pages and return. */
BT_STK_POP(t);
__bam_stkrel(dbp);
return (ret);
}
/*
* __bam_dpages --
* Delete a set of locked pages.
*/
static int
__bam_dpages(dbp, t)
DB *dbp;
BTREE *t;
{
DBT a, b;
DB_LOCK lock;
EPG *epg;
PAGE *h;
db_pgno_t pgno;
db_recno_t rcnt;
int ret;
rcnt = 0; /* XXX: Shut the compiler up. */
epg = t->bt_sp;
/*
* !!!
* There is an interesting deadlock situation here. We have to relink
* the leaf page chain around the leaf page being deleted. Consider
* a cursor walking through the leaf pages, that has the previous page
* read-locked and is waiting on a lock for the page we're deleting.
* It will deadlock here. This is a problem, because if our process is
* selected to resolve the deadlock, we'll leave an empty leaf page
* that we can never again access by walking down the tree. So, before
* we unlink the subtree, we relink the leaf page chain.
*/
if ((ret = __db_relink(dbp, t->bt_csp->page, NULL, 1)) != 0)
goto release;
/*
* We have the entire stack of deletable pages locked. Start from the
* top of the tree and move to the bottom, as it's better to release
* the inner pages as soon as possible.
*/
if ((ret = __bam_ditem(dbp, epg->page, epg->indx)) != 0)
goto release;
/*
* If we deleted the next-to-last item from the root page, the tree
* has collapsed a level. Try and write lock the remaining root + 1
* page and copy it onto the root page. If we can't get the lock,
* that's okay, the tree just stays a level deeper than we'd like.
*/
h = epg->page;
if (h->pgno == PGNO_ROOT && NUM_ENT(h) == 1) {
pgno = TYPE(epg->page) == P_IBTREE ?
GET_BINTERNAL(epg->page, 0)->pgno :
GET_RINTERNAL(epg->page, 0)->pgno;
if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_WRITE, &lock)) != 0)
goto release;
if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0)
goto release;
/* Log the change. */
if (DB_LOGGING(dbp)) {
memset(&a, 0, sizeof(a));
a.data = h;
a.size = dbp->pgsize;
memset(&b, 0, sizeof(b));
b.data = P_ENTRY(epg->page, 0);
b.size = BINTERNAL_SIZE(((BINTERNAL *)b.data)->len);
__bam_rsplit_log(dbp->dbenv->lg_info, dbp->txn,
&h->lsn, 0, dbp->log_fileid, h->pgno, &a, &b,
&epg->page->lsn);
}
/*
* Make the switch.
*
* One fixup -- if the tree has record numbers and we're not
* converting to a leaf page, we have to preserve the total
* record count.
*/
if (TYPE(h) == P_IRECNO ||
(TYPE(h) == P_IBTREE && F_ISSET(dbp, DB_BT_RECNUM)))
rcnt = RE_NREC(epg->page);
memcpy(epg->page, h, dbp->pgsize);
epg->page->pgno = PGNO_ROOT;
if (TYPE(h) == P_IRECNO ||
(TYPE(h) == P_IBTREE && F_ISSET(dbp, DB_BT_RECNUM)))
RE_NREC_SET(epg->page, rcnt);
/* Free the last page in that level of the btree. */
++t->lstat.bt_freed;
(void)__bam_free(dbp, h);
/* Adjust the cursors. */
__bam_ca_move(dbp, t, h->pgno, PGNO_ROOT);
(void)__BT_TLPUT(dbp, lock);
}
/* Release the top page in the subtree. */
(void)memp_fput(dbp->mpf, epg->page, 0);
(void)__BT_TLPUT(dbp, epg->lock);
/*
* Free the rest of the pages.
*
* XXX
* Don't bother checking for errors. We've unlinked the subtree from
* the tree, and there's no possibility of recovery.
*/
for (; ++epg <= t->bt_csp; ++t->lstat.bt_freed) {
if (NUM_ENT(epg->page) != 0)
(void)__bam_ditem(dbp, epg->page, epg->indx);
(void)__bam_free(dbp, epg->page);
(void)__BT_TLPUT(dbp, epg->lock);
}
return (0);
release:
/* Discard any remaining pages and return. */
for (; epg <= t->bt_csp; ++epg) {
(void)memp_fput(dbp->mpf, epg->page, 0);
(void)__BT_TLPUT(dbp, epg->lock);
}
return (ret);
}

355
db2/btree/bt_open.c Normal file
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@ -0,0 +1,355 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_open.c 10.20 (Sleepycat) 8/19/97";
#endif /* not lint */
/*
* Implementation of btree access method for 4.4BSD.
*
* The design here was originally based on that of the btree access method
* used in the Postgres database system at UC Berkeley. This implementation
* is wholly independent of the Postgres code.
*/
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
#include "common_ext.h"
static int __bam_keyalloc __P((BTREE *));
static int __bam_setmeta __P((DB *, BTREE *));
/*
* __bam_open --
* Open a btree.
*
* PUBLIC: int __bam_open __P((DB *, DBTYPE, DB_INFO *));
*/
int
__bam_open(dbp, type, dbinfo)
DB *dbp;
DBTYPE type;
DB_INFO *dbinfo;
{
BTREE *t;
int ret;
/* Allocate the btree internal structure. */
if ((t = (BTREE *)calloc(1, sizeof(BTREE))) == NULL)
return (ENOMEM);
t->bt_sp = t->bt_csp = t->bt_stack;
t->bt_esp = t->bt_stack + sizeof(t->bt_stack) / sizeof(t->bt_stack[0]);
if ((type == DB_RECNO || F_ISSET(dbp, DB_BT_RECNUM)) &&
(ret = __bam_keyalloc(t)) != 0)
goto err;
/*
* Intention is to make sure all of the user's selections are okay
* here and then use them without checking.
*/
if (dbinfo != NULL) {
/* Minimum number of keys per page. */
if (dbinfo->bt_minkey == 0)
t->bt_minkey = DEFMINKEYPAGE;
else {
if (dbinfo->bt_minkey < 2)
goto einval;
t->bt_minkey = dbinfo->bt_minkey;
}
/* Maximum number of keys per page. */
if (dbinfo->bt_maxkey == 0)
t->bt_maxkey = 0;
else {
if (dbinfo->bt_maxkey < 1)
goto einval;
t->bt_maxkey = dbinfo->bt_maxkey;
}
/*
* If no comparison, use default comparison. If no comparison
* and no prefix, use default prefix. (We can't default the
* prefix if the user supplies a comparison routine; shortening
* the keys may break their comparison algorithm.)
*/
t->bt_compare = dbinfo->bt_compare == NULL ?
__bam_defcmp : dbinfo->bt_compare;
t->bt_prefix = dbinfo->bt_prefix == NULL ?
(dbinfo->bt_compare == NULL ?
__bam_defpfx : NULL) : dbinfo->bt_prefix;
} else {
t->bt_minkey = DEFMINKEYPAGE;
t->bt_compare = __bam_defcmp;
t->bt_prefix = __bam_defpfx;
}
/* Initialize the remaining fields of the DB. */
dbp->type = type;
dbp->internal = t;
dbp->cursor = __bam_cursor;
dbp->del = __bam_delete;
dbp->get = __bam_get;
dbp->put = __bam_put;
dbp->stat = __bam_stat;
dbp->sync = __bam_sync;
/*
* The btree data structure requires that at least two key/data pairs
* can fit on a page, but other than that there's no fixed requirement.
* Translate the minimum number of items into the bytes a key/data pair
* can use before being placed on an overflow page. We calculate for
* the worst possible alignment by assuming every item requires the
* maximum alignment for padding.
*
* Recno uses the btree bt_ovflsize value -- it's close enough.
*/
t->bt_ovflsize = (dbp->pgsize - P_OVERHEAD) / (t->bt_minkey * P_INDX)
- (BKEYDATA_PSIZE(0) + ALIGN(1, 4));
/* Create a root page if new tree. */
if ((ret = __bam_setmeta(dbp, t)) != 0)
goto err;
return (0);
einval: ret = EINVAL;
err: if (t != NULL) {
/* If we allocated room for key/data return, discard it. */
if (t->bt_rkey.data != NULL)
free(t->bt_rkey.data);
FREE(t, sizeof(BTREE));
}
return (ret);
}
/*
* __bam_bdup --
* Create a BTREE handle for a threaded DB handle.
*
* PUBLIC: int __bam_bdup __P((DB *, DB *));
*/
int
__bam_bdup(orig, new)
DB *orig, *new;
{
BTREE *t, *ot;
int ret;
ot = orig->internal;
if ((t = (BTREE *)calloc(1, sizeof(*t))) == NULL)
return (ENOMEM);
/*
* !!!
* Ignore the cursor queue, only the first DB has attached cursors.
*/
t->bt_sp = t->bt_csp = t->bt_stack;
t->bt_esp = t->bt_stack + sizeof(t->bt_stack) / sizeof(t->bt_stack[0]);
if ((orig->type == DB_RECNO || F_ISSET(orig, DB_BT_RECNUM)) &&
(ret = __bam_keyalloc(t)) != 0) {
FREE(t, sizeof(*t));
return (ret);
}
t->bt_maxkey = ot->bt_maxkey;
t->bt_minkey = ot->bt_minkey;
t->bt_compare = ot->bt_compare;
t->bt_prefix = ot->bt_prefix;
t->bt_ovflsize = ot->bt_ovflsize;
/*
* !!!
* The entire RECNO structure is shared. If it breaks, the application
* was misusing it to start with.
*/
t->bt_recno = ot->bt_recno;
new->internal = t;
return (0);
}
/*
* __bam_keyalloc --
* Allocate return memory for recno keys.
*/
static int
__bam_keyalloc(t)
BTREE *t;
{
/*
* Recno keys are always the same size, and we don't want to have
* to check for space on each return. Allocate it now.
*/
if ((t->bt_rkey.data = (void *)malloc(sizeof(db_recno_t))) == NULL)
return (ENOMEM);
t->bt_rkey.ulen = sizeof(db_recno_t);
return (0);
}
/*
* __bam_setmeta --
* Check (and optionally create) a tree.
*/
static int
__bam_setmeta(dbp, t)
DB *dbp;
BTREE *t;
{
BTMETA *meta;
PAGE *root;
DB_LOCK mlock, rlock;
db_pgno_t pgno;
int ret;
/* Get, and optionally create the metadata page. */
pgno = PGNO_METADATA;
if ((ret =
__bam_lget(dbp, 0, PGNO_METADATA, DB_LOCK_WRITE, &mlock)) != 0)
return (ret);
if ((ret =
__bam_pget(dbp, (PAGE **)&meta, &pgno, DB_MPOOL_CREATE)) != 0) {
(void)__BT_LPUT(dbp, mlock);
return (ret);
}
/*
* If the magic number is correct, we're not creating the tree.
* Correct any fields that may not be right. Note, all of the
* local flags were set by db_open(3).
*/
if (meta->magic != 0) {
t->bt_maxkey = meta->maxkey;
t->bt_minkey = meta->minkey;
(void)memp_fput(dbp->mpf, (PAGE *)meta, 0);
(void)__BT_LPUT(dbp, mlock);
return (0);
}
/* Initialize the tree structure metadata information. */
ZERO_LSN(meta->lsn);
meta->pgno = PGNO_METADATA;
meta->magic = DB_BTREEMAGIC;
meta->version = DB_BTREEVERSION;
meta->pagesize = dbp->pgsize;
meta->maxkey = t->bt_maxkey;
meta->minkey = t->bt_minkey;
meta->free = PGNO_INVALID;
meta->flags = 0;
if (dbp->type == DB_RECNO)
F_SET(meta, BTM_RECNO);
if (F_ISSET(dbp, DB_AM_DUP))
F_SET(meta, BTM_DUP);
if (F_ISSET(dbp, DB_RE_FIXEDLEN))
F_SET(meta, BTM_FIXEDLEN);
if (F_ISSET(dbp, DB_BT_RECNUM))
F_SET(meta, BTM_RECNUM);
if (F_ISSET(dbp, DB_RE_RENUMBER))
F_SET(meta, BTM_RENUMBER);
meta->re_len = 0;
meta->re_pad = 0;
memcpy(meta->uid, dbp->lock.fileid, DB_FILE_ID_LEN);
/* Create and initialize a root page. */
pgno = PGNO_ROOT;
if ((ret = __bam_lget(dbp, 0, PGNO_ROOT, DB_LOCK_WRITE, &rlock)) != 0)
return (ret);
if ((ret = __bam_pget(dbp, &root, &pgno, DB_MPOOL_CREATE)) != 0) {
(void)__BT_LPUT(dbp, rlock);
return (ret);
}
P_INIT(root, dbp->pgsize, PGNO_ROOT, PGNO_INVALID,
PGNO_INVALID, 1, dbp->type == DB_RECNO ? P_LRECNO : P_LBTREE);
ZERO_LSN(root->lsn);
/* Release the metadata and root pages. */
if ((ret = memp_fput(dbp->mpf, (PAGE *)meta, DB_MPOOL_DIRTY)) != 0)
return (ret);
if ((ret = memp_fput(dbp->mpf, root, DB_MPOOL_DIRTY)) != 0)
return (ret);
/*
* Flush the metadata and root pages to disk -- since the user can't
* transaction protect open, the pages have to exist during recovery.
*
* XXX
* It's not useful to return not-yet-flushed here -- convert it to
* an error.
*/
if ((ret = memp_fsync(dbp->mpf)) == DB_INCOMPLETE)
ret = EINVAL;
/* Release the locks. */
(void)__BT_LPUT(dbp, mlock);
(void)__BT_LPUT(dbp, rlock);
return (ret);
}

312
db2/btree/bt_page.c Normal file
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@ -0,0 +1,312 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_page.c 10.5 (Sleepycat) 8/18/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
/*
* __bam_new --
* Get a new page, preferably from the freelist.
*
* PUBLIC: int __bam_new __P((DB *, u_int32_t, PAGE **));
*/
int
__bam_new(dbp, type, pagepp)
DB *dbp;
u_int32_t type;
PAGE **pagepp;
{
BTMETA *meta;
DB_LOCK mlock;
PAGE *h;
db_pgno_t pgno;
int ret;
meta = NULL;
h = NULL;
mlock = LOCK_INVALID;
pgno = PGNO_METADATA;
if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_WRITE, &mlock)) != 0)
goto err;
if ((ret = __bam_pget(dbp, (PAGE **)&meta, &pgno, 0)) != 0)
goto err;
if (meta->free == PGNO_INVALID) {
if ((ret = __bam_pget(dbp, &h, &pgno, DB_MPOOL_NEW)) != 0)
goto err;
ZERO_LSN(h->lsn);
h->pgno = pgno;
} else {
pgno = meta->free;
if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0)
goto err;
meta->free = h->next_pgno;
}
/* Log the change. */
if (DB_LOGGING(dbp)) {
if ((ret = __bam_pg_alloc_log(dbp->dbenv->lg_info, dbp->txn,
&meta->lsn, 0, dbp->log_fileid, &meta->lsn, &h->lsn,
h->pgno, (u_int32_t)type, meta->free)) != 0)
goto err;
LSN(h) = LSN(meta);
}
(void)memp_fput(dbp->mpf, (PAGE *)meta, DB_MPOOL_DIRTY);
(void)__BT_TLPUT(dbp, mlock);
P_INIT(h, dbp->pgsize, h->pgno, PGNO_INVALID, PGNO_INVALID, 0, type);
*pagepp = h;
return (0);
err: if (h != NULL)
(void)memp_fput(dbp->mpf, h, 0);
if (meta != NULL)
(void)memp_fput(dbp->mpf, meta, 0);
if (mlock != LOCK_INVALID)
(void)__BT_TLPUT(dbp, mlock);
return (ret);
}
/*
* __bam_free --
* Add a page to the head of the freelist.
*
* PUBLIC: int __bam_free __P((DB *, PAGE *));
*/
int
__bam_free(dbp, h)
DB *dbp;
PAGE *h;
{
BTMETA *meta;
DBT ldbt;
DB_LOCK mlock;
db_pgno_t pgno;
int is_dirty, ret, t_ret;
/*
* Retrieve the metadata page and insert the page at the head of
* the free list. If either the lock get or page get routines
* fail, then we need to put the page with which we were called
* back because our caller assumes we take care of it.
*/
is_dirty = 0;
pgno = PGNO_METADATA;
if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_WRITE, &mlock)) != 0)
goto err;
if ((ret = __bam_pget(dbp, (PAGE **)&meta, &pgno, 0)) != 0) {
(void)__BT_TLPUT(dbp, mlock);
goto err;
}
/* Log the change. */
if (DB_LOGGING(dbp)) {
memset(&ldbt, 0, sizeof(ldbt));
ldbt.data = h;
ldbt.size = P_OVERHEAD;
if ((ret = __bam_pg_free_log(dbp->dbenv->lg_info,
dbp->txn, &meta->lsn, 0, dbp->log_fileid, h->pgno,
&meta->lsn, &ldbt, meta->free)) != 0) {
(void)memp_fput(dbp->mpf, (PAGE *)meta, 0);
(void)__BT_TLPUT(dbp, mlock);
return (ret);
}
LSN(h) = LSN(meta);
}
/*
* The page should have nothing interesting on it, re-initialize it,
* leaving only the page number and the LSN.
*/
#ifdef DEBUG
{ db_pgno_t __pgno; DB_LSN __lsn;
__pgno = h->pgno;
__lsn = h->lsn;
memset(h, 0xff, dbp->pgsize);
h->pgno = __pgno;
h->lsn = __lsn;
}
#endif
P_INIT(h, dbp->pgsize, h->pgno, PGNO_INVALID, meta->free, 0, P_INVALID);
/* Link the page on the metadata free list. */
meta->free = h->pgno;
/* Discard the metadata page. */
ret = memp_fput(dbp->mpf, (PAGE *)meta, DB_MPOOL_DIRTY);
if ((t_ret = __BT_TLPUT(dbp, mlock)) != 0)
ret = t_ret;
/* Discard the caller's page reference. */
is_dirty = DB_MPOOL_DIRTY;
err: if ((t_ret = memp_fput(dbp->mpf, h, is_dirty)) != 0 && ret == 0)
ret = t_ret;
/*
* XXX
* We have to unlock the caller's page in the caller!
*/
return (ret);
}
#ifdef DEBUG
/*
* __bam_lt --
* Print out the list of currently held locks.
*/
int
__bam_lt(dbp)
DB *dbp;
{
DB_LOCKREQ req;
if (F_ISSET(dbp, DB_AM_LOCKING)) {
req.op = DB_LOCK_DUMP;
lock_vec(dbp->dbenv->lk_info, dbp->locker, 0, &req, 1, NULL);
}
return (0);
}
#endif
/*
* __bam_lget --
* The standard lock get call.
*
* PUBLIC: int __bam_lget __P((DB *, int, db_pgno_t, db_lockmode_t, DB_LOCK *));
*/
int
__bam_lget(dbp, do_couple, pgno, mode, lockp)
DB *dbp;
int do_couple;
db_pgno_t pgno;
db_lockmode_t mode;
DB_LOCK *lockp;
{
DB_LOCKREQ couple[2];
u_int32_t locker;
int ret;
if (!F_ISSET(dbp, DB_AM_LOCKING))
return (0);
locker = dbp->txn == NULL ? dbp->locker : dbp->txn->txnid;
dbp->lock.pgno = pgno;
/*
* If the object not currently locked, acquire the lock and return,
* otherwise, lock couple. If we fail and it's not a system error,
* convert to EAGAIN.
*/
if (do_couple) {
couple[0].op = DB_LOCK_GET;
couple[0].obj = &dbp->lock_dbt;
couple[0].mode = mode;
couple[1].op = DB_LOCK_PUT;
couple[1].lock = *lockp;
ret = lock_vec(dbp->dbenv->lk_info, locker, 0, couple, 2, NULL);
if (ret != 0) {
/* If we fail, discard the lock we held. */
__bam_lput(dbp, *lockp);
return (ret < 0 ? EAGAIN : ret);
}
*lockp = couple[0].lock;
} else {
ret = lock_get(dbp->dbenv->lk_info,
locker, 0, &dbp->lock_dbt, mode, lockp);
return (ret < 0 ? EAGAIN : ret);
}
return (0);
}
/*
* __bam_lput --
* The standard lock put call.
*
* PUBLIC: int __bam_lput __P((DB *, DB_LOCK));
*/
int
__bam_lput(dbp, lock)
DB *dbp;
DB_LOCK lock;
{
return (__BT_LPUT(dbp, lock));
}
/*
* __bam_pget --
* The standard page get call.
*
* PUBLIC: int __bam_pget __P((DB *, PAGE **, db_pgno_t *, int));
*/
int
__bam_pget(dbp, hp, pgnop, mflags)
DB *dbp;
PAGE **hp;
db_pgno_t *pgnop;
int mflags;
{
return (memp_fget((dbp)->mpf,
pgnop, mflags, hp) == 0 ? 0 : __db_pgerr(dbp, *pgnop));
}

919
db2/btree/bt_put.c Normal file
View File

@ -0,0 +1,919 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_put.c 10.23 (Sleepycat) 8/22/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
static int __bam_fixed __P((BTREE *, DBT *));
static int __bam_lookup __P((DB *, DBT *, int *));
static int __bam_ndup __P((DB *, PAGE *, u_int32_t));
static int __bam_partial __P((DB *, DBT *, PAGE *, u_int32_t));
/*
* __bam_put --
* Add a new key/data pair or replace an existing pair (btree).
*
* PUBLIC: int __bam_put __P((DB *, DB_TXN *, DBT *, DBT *, int));
*/
int
__bam_put(argdbp, txn, key, data, flags)
DB *argdbp;
DB_TXN *txn;
DBT *key, *data;
int flags;
{
BTREE *t;
CURSOR c;
DB *dbp;
PAGE *h;
db_indx_t indx;
int exact, iflags, newkey, replace, ret, stack;
DEBUG_LWRITE(argdbp, txn, "bam_put", key, data, flags);
/* Check flags. */
if ((ret = __db_putchk(argdbp, key, data, flags,
F_ISSET(argdbp, DB_AM_RDONLY), F_ISSET(argdbp, DB_AM_DUP))) != 0)
return (ret);
GETHANDLE(argdbp, txn, &dbp, ret);
t = dbp->internal;
retry: /*
* Find the location at which to insert. The call to bt_lookup()
* leaves the returned page pinned.
*/
if ((ret = __bam_lookup(dbp, key, &exact)) != 0) {
PUTHANDLE(dbp);
return (ret);
}
h = t->bt_csp->page;
indx = t->bt_csp->indx;
stack = 1;
/*
* If an identical key is already in the tree, and DB_NOOVERWRITE is
* set, an error is returned. If an identical key is already in the
* tree and DB_NOOVERWRITE is not set, the key is either added (when
* duplicates are permitted) or an error is returned. The exception
* is when the item located is referenced by a cursor and marked for
* deletion, in which case we permit the overwrite and flag the cursor.
*/
replace = 0;
if (exact && flags == DB_NOOVERWRITE) {
if (!GET_BKEYDATA(h, indx + O_INDX)->deleted) {
ret = DB_KEYEXIST;
goto err;
}
replace = 1;
__bam_ca_replace(dbp, h->pgno, indx, REPLACE_SETUP);
}
/*
* If we're inserting into the first or last page of the tree,
* remember where we did it so we can do fast lookup next time.
*
* XXX
* Does reverse order still work (did it ever!?!?)
*/
t->bt_lpgno =
h->next_pgno == PGNO_INVALID || h->prev_pgno == PGNO_INVALID ?
h->pgno : PGNO_INVALID;
/*
* Select the arguments for __bam_iitem() and do the insert. If the
* key is an exact match, we're either adding a new duplicate at the
* end of the duplicate set, or we're replacing the data item with a
* new data item. If the key isn't an exact match, we're inserting
* a new key/data pair, before the search location.
*/
newkey = dbp->type == DB_BTREE && !exact;
if (exact) {
if (F_ISSET(dbp, DB_AM_DUP)) {
/*
* Make sure that we're not looking at a page of
* duplicates -- if so, move to the last entry on
* that page.
*/
c.page = h;
c.pgno = h->pgno;
c.indx = indx;
c.dpgno = PGNO_INVALID;
c.dindx = 0;
if ((ret =
__bam_ovfl_chk(dbp, &c, indx + O_INDX, 1)) != 0)
goto err;
if (c.dpgno != PGNO_INVALID) {
/*
* XXX
* The __bam_ovfl_chk() routine memp_fput() the
* current page and acquired a new one, but did
* not do anything about the lock we're holding.
*/
t->bt_csp->page = h = c.page;
indx = c.dindx;
}
iflags = DB_AFTER;
} else
iflags = DB_CURRENT;
} else
iflags = DB_BEFORE;
/*
* The pages we're using may be modified by __bam_iitem(), so make
* sure we reset the stack.
*/
ret = __bam_iitem(dbp,
&h, &indx, key, data, iflags, newkey ? BI_NEWKEY : 0);
t->bt_csp->page = h;
t->bt_csp->indx = indx;
switch (ret) {
case 0:
/*
* Done. Clean up the cursor, and, if we're doing record
* numbers, adjust the internal page counts.
*/
if (replace)
__bam_ca_replace(dbp, h->pgno, indx, REPLACE_SUCCESS);
if (!replace && F_ISSET(dbp, DB_BT_RECNUM))
ret = __bam_adjust(dbp, t, 1);
break;
case DB_NEEDSPLIT:
/*
* We have to split the page. Back out the cursor setup,
* discard the stack of pages, and do the split.
*/
if (replace) {
replace = 0;
__bam_ca_replace(dbp, h->pgno, indx, REPLACE_FAILED);
}
(void)__bam_stkrel(dbp);
stack = 0;
if ((ret = __bam_split(dbp, key)) != 0)
break;
goto retry;
/* NOTREACHED */
default:
if (replace)
__bam_ca_replace(dbp, h->pgno, indx, REPLACE_FAILED);
break;
}
err: if (stack)
(void)__bam_stkrel(dbp);
PUTHANDLE(dbp);
return (ret);
}
/*
* __bam_lookup --
* Find the right location in the tree for the key.
*/
static int
__bam_lookup(dbp, key, exactp)
DB *dbp;
DBT *key;
int *exactp;
{
BTREE *t;
DB_LOCK lock;
EPG e;
PAGE *h;
db_indx_t indx;
int cmp, ret;
t = dbp->internal;
h = NULL;
/*
* Record numbers can't be fast-tracked, we have to lock the entire
* tree.
*/
if (F_ISSET(dbp, DB_BT_RECNUM))
goto slow;
/* Check to see if we've been seeing sorted input. */
if (t->bt_lpgno == PGNO_INVALID)
goto slow;
/*
* Retrieve the page on which we did the last insert. It's okay if
* it doesn't exist, or if it's not the page type we expect, it just
* means that the world changed.
*/
if (__bam_lget(dbp, 0, t->bt_lpgno, DB_LOCK_WRITE, &lock))
goto miss;
if (__bam_pget(dbp, &h, &t->bt_lpgno, 0)) {
(void)__BT_LPUT(dbp, lock);
goto miss;
}
if (TYPE(h) != P_LBTREE)
goto miss;
if (NUM_ENT(h) == 0)
goto miss;
/*
* We have to be at the end or beginning of the tree to know that
* we're inserting in a sort order. If that's the case and we're
* in the right order in comparison to the first/last key/data pair,
* we have the right position.
*/
if (h->next_pgno == PGNO_INVALID) {
e.page = h;
e.indx = NUM_ENT(h) - P_INDX;
if ((cmp = __bam_cmp(dbp, key, &e)) >= 0) {
if (cmp > 0)
e.indx += P_INDX;
goto fast;
}
}
if (h->prev_pgno == PGNO_INVALID) {
e.page = h;
e.indx = 0;
if ((cmp = __bam_cmp(dbp, key, &e)) <= 0) {
/*
* We're doing a put, so we want to insert as the last
* of any set of duplicates.
*/
if (cmp == 0) {
for (indx = 0;
indx < (db_indx_t)(NUM_ENT(h) - P_INDX) &&
h->inp[indx] == h->inp[indx + P_INDX];
indx += P_INDX);
e.indx = indx;
}
goto fast;
}
}
goto miss;
/* Set the exact match flag in case we've already inserted this key. */
fast: *exactp = cmp == 0;
/* Enter the entry in the stack. */
BT_STK_CLR(t);
BT_STK_ENTER(t, e.page, e.indx, lock, ret);
if (ret != 0)
return (ret);
++t->lstat.bt_cache_hit;
return (0);
miss: ++t->lstat.bt_cache_miss;
if (h != NULL) {
(void)memp_fput(dbp->mpf, h, 0);
(void)__BT_LPUT(dbp, lock);
}
slow: return (__bam_search(dbp, key, S_INSERT, 1, NULL, exactp));
}
/*
* OVPUT --
* Copy an overflow item onto a page.
*/
#undef OVPUT
#define OVPUT(h, indx, bo) do { \
DBT __hdr; \
memset(&__hdr, 0, sizeof(__hdr)); \
__hdr.data = &bo; \
__hdr.size = BOVERFLOW_SIZE; \
if ((ret = __db_pitem(dbp, \
h, indx, BOVERFLOW_SIZE, &__hdr, NULL)) != 0) \
return (ret); \
} while (0)
/*
* __bam_iitem --
* Insert an item into the tree.
*
* PUBLIC: int __bam_iitem __P((DB *,
* PUBLIC: PAGE **, db_indx_t *, DBT *, DBT *, int, int));
*/
int
__bam_iitem(dbp, hp, indxp, key, data, op, flags)
DB *dbp;
PAGE **hp;
db_indx_t *indxp;
DBT *key, *data;
int op, flags;
{
BTREE *t;
BKEYDATA *bk;
BOVERFLOW kbo, dbo;
DBT tdbt;
PAGE *h;
db_indx_t indx;
u_int32_t have_bytes, need_bytes, needed;
int bigkey, bigdata, dcopy, dupadjust, ret;
t = dbp->internal;
h = *hp;
indx = *indxp;
dupadjust = 0;
bk = NULL; /* XXX: Shut the compiler up. */
/*
* If it's a page of duplicates, call the common code to do the work.
*
* !!!
* Here's where the hp and indxp are important. The duplicate code
* may decide to rework/rearrange the pages and indices we're using,
* so the caller must understand that the stack has to change.
*/
if (TYPE(h) == P_DUPLICATE) {
/* Adjust the index for the new item if it's a DB_AFTER op. */
if (op == DB_AFTER)
++*indxp;
/* Remove the current item if it's a DB_CURRENT op. */
if (op == DB_CURRENT && (ret = __db_ditem(dbp, *hp, *indxp,
BKEYDATA_SIZE(GET_BKEYDATA(*hp, *indxp)->len))) != 0)
return (ret);
/* Put the new/replacement item onto the page. */
return (__db_dput(dbp, data, hp, indxp, __bam_new));
}
/*
* XXX
* Handle partial puts.
*
* This is truly awful from a performance standput. We don't optimize
* for partial puts at all, we delete the record and add it back in,
* regardless of size or if we're simply overwriting current data.
* The hash access method does this a lot better than we do, and we're
* eventually going to have to fix it.
*/
if (F_ISSET(data, DB_DBT_PARTIAL)) {
tdbt = *data;
if ((ret = __bam_partial(dbp, &tdbt, h, indx)) != 0)
return (ret);
data = &tdbt;
}
/* If it's a short fixed-length record, fix it up. */
if (F_ISSET(dbp, DB_RE_FIXEDLEN) && data->size != t->bt_recno->re_len) {
tdbt = *data;
if ((ret = __bam_fixed(t, &tdbt)) != 0)
return (ret);
data = &tdbt;
}
/*
* If the key or data item won't fit on a page, store it in the
* overflow pages.
*
* !!!
* From this point on, we have to recover the allocated overflow
* pages on error.
*/
bigkey = bigdata = 0;
if (LF_ISSET(BI_NEWKEY) && key->size > t->bt_ovflsize) {
kbo.deleted = 0;
kbo.type = B_OVERFLOW;
kbo.tlen = key->size;
if ((ret = __db_poff(dbp, key, &kbo.pgno, __bam_new)) != 0)
goto err;
bigkey = 1;
}
if (data->size > t->bt_ovflsize) {
dbo.deleted = 0;
dbo.type = B_OVERFLOW;
dbo.tlen = data->size;
if ((ret = __db_poff(dbp, data, &dbo.pgno, __bam_new)) != 0)
goto err;
bigdata = 1;
}
dcopy = 0;
needed = 0;
if (LF_ISSET(BI_NEWKEY)) {
/* If BI_NEWKEY is set we're adding a new key and data pair. */
if (bigkey)
needed += BOVERFLOW_PSIZE;
else
needed += BKEYDATA_PSIZE(key->size);
if (bigdata)
needed += BOVERFLOW_PSIZE;
else
needed += BKEYDATA_PSIZE(data->size);
} else {
/*
* We're either overwriting the data item of a key/data pair
* or we're adding the data item only, i.e. a new duplicate.
*/
if (op == DB_CURRENT) {
bk = GET_BKEYDATA(h,
indx + (TYPE(h) == P_LBTREE ? O_INDX : 0));
if (bk->type == B_OVERFLOW)
have_bytes = BOVERFLOW_PSIZE;
else
have_bytes = BKEYDATA_PSIZE(bk->len);
need_bytes = 0;
} else {
have_bytes = 0;
need_bytes = sizeof(db_indx_t);
}
if (bigdata)
need_bytes += BOVERFLOW_PSIZE;
else
need_bytes += BKEYDATA_PSIZE(data->size);
/*
* If we're overwriting a data item, we copy it if it's not a
* special record type and it's the same size (including any
* alignment) and do a delete/insert otherwise.
*/
if (op == DB_CURRENT && !bigdata &&
bk->type == B_KEYDATA && have_bytes == need_bytes)
dcopy = 1;
if (have_bytes < need_bytes)
needed += need_bytes - have_bytes;
}
/*
* If there's not enough room, or the user has put a ceiling on the
* number of keys permitted in the page, split the page.
*
* XXX
* The t->bt_maxkey test here may be insufficient -- do we have to
* check in the btree split code, so we don't undo it there!?!?
*/
if (P_FREESPACE(h) < needed ||
(t->bt_maxkey != 0 && NUM_ENT(h) > t->bt_maxkey)) {
ret = DB_NEEDSPLIT;
goto err;
}
/*
* The code breaks it up into six cases:
*
* 1. Append a new key/data pair.
* 2. Insert a new key/data pair.
* 3. Copy the data item.
* 4. Delete/insert the data item.
* 5. Append a new data item.
* 6. Insert a new data item.
*/
if (LF_ISSET(BI_NEWKEY)) {
switch (op) {
case DB_AFTER: /* 1. Append a new key/data pair. */
indx += 2;
*indxp += 2;
break;
case DB_BEFORE: /* 2. Insert a new key/data pair. */
break;
default:
abort();
}
/* Add the key. */
if (bigkey)
OVPUT(h, indx, kbo);
else {
DBT __data;
memset(&__data, 0, sizeof(__data));
__data.data = key->data;
__data.size = key->size;
if ((ret = __db_pitem(dbp, h, indx,
BKEYDATA_SIZE(key->size), NULL, &__data)) != 0)
goto err;
}
++indx;
} else {
switch (op) {
case DB_CURRENT: /* 3. Copy the data item. */
/*
* If we're not logging and it's possible, overwrite
* the current item.
*
* XXX
* We should add a separate logging message so that
* we can do this anytime it's possible, including
* for partial record puts.
*/
if (dcopy && !DB_LOGGING(dbp)) {
bk->len = data->size;
memcpy(bk->data, data->data, data->size);
goto done;
}
/* 4. Delete/insert the data item. */
if (TYPE(h) == P_LBTREE)
++indx;
if ((ret = __bam_ditem(dbp, h, indx)) != 0)
goto err;
break;
case DB_AFTER: /* 5. Append a new data item. */
if (TYPE(h) == P_LBTREE) {
/*
* Adjust the cursor and copy in the key for
* the duplicate.
*/
if ((ret = __bam_adjindx(dbp,
h, indx + P_INDX, indx, 1)) != 0)
goto err;
indx += 3;
dupadjust = 1;
*indxp += 2;
} else {
++indx;
__bam_ca_di(dbp, h->pgno, indx, 1);
*indxp += 1;
}
break;
case DB_BEFORE: /* 6. Insert a new data item. */
if (TYPE(h) == P_LBTREE) {
/*
* Adjust the cursor and copy in the key for
* the duplicate.
*/
if ((ret =
__bam_adjindx(dbp, h, indx, indx, 1)) != 0)
goto err;
++indx;
dupadjust = 1;
} else
__bam_ca_di(dbp, h->pgno, indx, 1);
break;
default:
abort();
}
}
/* Add the data. */
if (bigdata)
OVPUT(h, indx, dbo);
else {
BKEYDATA __bk;
DBT __hdr, __data;
memset(&__data, 0, sizeof(__data));
__data.data = data->data;
__data.size = data->size;
if (LF_ISSET(BI_DELETED)) {
__bk.len = __data.size;
__bk.deleted = 1;
__bk.type = B_KEYDATA;
__hdr.data = &__bk;
__hdr.size = SSZA(BKEYDATA, data);
ret = __db_pitem(dbp, h, indx,
BKEYDATA_SIZE(__data.size), &__hdr, &__data);
} else
ret = __db_pitem(dbp, h, indx,
BKEYDATA_SIZE(data->size), NULL, &__data);
if (ret != 0)
goto err;
}
done: ++t->lstat.bt_added;
ret = memp_fset(dbp->mpf, h, DB_MPOOL_DIRTY);
/*
* If the page is at least 50% full, and we added a duplicate, see if
* that set of duplicates takes up at least 25% of the space. If it
* does, move it off onto its own page.
*/
if (dupadjust && P_FREESPACE(h) <= dbp->pgsize / 2) {
--indx;
if ((ret = __bam_ndup(dbp, h, indx)) != 0)
goto err;
}
if (t->bt_recno != NULL)
F_SET(t->bt_recno, RECNO_MODIFIED);
if (0) {
err: if (bigkey)
(void)__db_doff(dbp, kbo.pgno, __bam_free);
if (bigdata)
(void)__db_doff(dbp, dbo.pgno, __bam_free);
}
return (ret);
}
/*
* __bam_ndup --
* Check to see if the duplicate set at indx should have its own page.
* If it should, create it.
*/
static int
__bam_ndup(dbp, h, indx)
DB *dbp;
PAGE *h;
u_int32_t indx;
{
BKEYDATA *bk;
BOVERFLOW bo;
DBT hdr;
PAGE *cp;
db_indx_t cnt, cpindx, first, sz;
int ret;
while (indx > 0 && h->inp[indx] == h->inp[indx - P_INDX])
indx -= P_INDX;
for (cnt = 0, sz = 0, first = indx;; ++cnt, indx += P_INDX) {
if (indx >= NUM_ENT(h) || h->inp[first] != h->inp[indx])
break;
bk = GET_BKEYDATA(h, indx);
sz += bk->type == B_KEYDATA ?
BKEYDATA_PSIZE(bk->len) : BOVERFLOW_PSIZE;
bk = GET_BKEYDATA(h, indx + O_INDX);
sz += bk->type == B_KEYDATA ?
BKEYDATA_PSIZE(bk->len) : BOVERFLOW_PSIZE;
}
/*
* If this set of duplicates is using more than 25% of the page, move
* them off. The choice of 25% is a WAG, but it has to be small enough
* that we can always split regardless of the presence of duplicates.
*/
if (sz < dbp->pgsize / 4)
return (0);
/* Get a new page. */
if ((ret = __bam_new(dbp, P_DUPLICATE, &cp)) != 0)
return (ret);
/*
* Move this set of duplicates off the page. First points to the first
* key of the first duplicate key/data pair, cnt is the number of pairs
* we're dealing with.
*/
memset(&hdr, 0, sizeof(hdr));
for (indx = first + O_INDX, cpindx = 0;; ++cpindx) {
/* Copy the entry to the new page. */
bk = GET_BKEYDATA(h, indx);
hdr.data = bk;
hdr.size = bk->type == B_KEYDATA ?
BKEYDATA_SIZE(bk->len) : BOVERFLOW_SIZE;
if ((ret =
__db_pitem(dbp, cp, cpindx, hdr.size, &hdr, NULL)) != 0)
goto err;
/*
* Move cursors referencing the old entry to the new entry.
* Done after the page put because __db_pitem() adjusts
* cursors on the new page, and before the delete because
* __db_ditem adjusts cursors on the old page.
*/
__bam_ca_dup(dbp,
PGNO(h), first, indx - O_INDX, PGNO(cp), cpindx);
/* Delete the data item. */
if ((ret = __db_ditem(dbp, h, indx, hdr.size)) != 0)
goto err;
/* Delete all but the first reference to the key. */
if (--cnt == 0)
break;
if ((ret = __bam_adjindx(dbp, h, indx, first, 0)) != 0)
goto err;
}
/* Put in a new data item that points to the duplicates page. */
bo.deleted = 0;
bo.type = B_DUPLICATE;
bo.pgno = cp->pgno;
bo.tlen = 0;
OVPUT(h, indx, bo);
return (memp_fput(dbp->mpf, cp, DB_MPOOL_DIRTY));
err: (void)__bam_free(dbp, cp);
return (ret);
}
/*
* __bam_fixed --
* Build the real record for a fixed length put.
*/
static int
__bam_fixed(t, dbt)
BTREE *t;
DBT *dbt;
{
RECNO *rp;
rp = t->bt_recno;
/*
* If using fixed-length records, and the record is long, return
* EINVAL. If it's short, pad it out. Use the record data return
* memory, it's only short-term.
*/
if (dbt->size > rp->re_len)
return (EINVAL);
if (t->bt_rdata.ulen < rp->re_len) {
t->bt_rdata.data = t->bt_rdata.data == NULL ?
(void *)malloc(rp->re_len) :
(void *)realloc(t->bt_rdata.data, rp->re_len);
if (t->bt_rdata.data == NULL) {
t->bt_rdata.ulen = 0;
return (ENOMEM);
}
t->bt_rdata.ulen = rp->re_len;
}
memcpy(t->bt_rdata.data, dbt->data, dbt->size);
memset((u_int8_t *)t->bt_rdata.data + dbt->size,
rp->re_pad, rp->re_len - dbt->size);
/* Set the DBT to reference our new record. */
t->bt_rdata.size = rp->re_len;
t->bt_rdata.dlen = 0;
t->bt_rdata.doff = 0;
t->bt_rdata.flags = 0;
*dbt = t->bt_rdata;
return (0);
}
/*
* __bam_partial --
* Build the real record for a partial put.
*/
static int
__bam_partial(dbp, dbt, h, indx)
DB *dbp;
DBT *dbt;
PAGE *h;
u_int32_t indx;
{
BTREE *t;
BKEYDATA *bk, tbk;
BOVERFLOW *bo;
DBT copy;
u_int32_t len, nbytes, tlen;
int ret;
u_int8_t *p;
bo = NULL; /* XXX: Shut the compiler up. */
t = dbp->internal;
/*
* Figure out how much total space we'll need. Worst case is where
* the record is 0 bytes long, in which case doff causes the record
* to extend, and the put data is appended to it.
*/
if (indx < NUM_ENT(h)) {
bk = GET_BKEYDATA(h, indx + (TYPE(h) == P_LBTREE ? O_INDX : 0));
if (bk->type == B_OVERFLOW) {
bo = (BOVERFLOW *)bk;
nbytes = bo->tlen;
} else
nbytes = bk->len;
} else {
bk = &tbk;
bk->type = B_KEYDATA;
nbytes = bk->len = 0;
}
nbytes += dbt->doff + dbt->size + dbt->dlen;
/* Allocate the space. */
if (t->bt_rdata.ulen < nbytes) {
t->bt_rdata.data = t->bt_rdata.data == NULL ?
(void *)malloc(nbytes) :
(void *)realloc(t->bt_rdata.data, nbytes);
if (t->bt_rdata.data == NULL) {
t->bt_rdata.ulen = 0;
return (ENOMEM);
}
t->bt_rdata.ulen = nbytes;
}
/* We use nul bytes for extending the record, get it over with. */
memset(t->bt_rdata.data, 0, nbytes);
tlen = 0;
if (bk->type == B_OVERFLOW) {
/* Take up to doff bytes from the record. */
memset(&copy, 0, sizeof(copy));
if ((ret = __db_goff(dbp, &copy, bo->tlen,
bo->pgno, &t->bt_rdata.data, &t->bt_rdata.ulen)) != 0)
return (ret);
tlen += dbt->doff;
/*
* If the original record was larger than the offset:
* If dlen > size, shift the remaining data down.
* If dlen < size, shift the remaining data up.
* Use memmove(), the regions may overlap.
*/
p = t->bt_rdata.data;
if (bo->tlen > dbt->doff)
if (dbt->dlen > dbt->size) {
tlen += len = bo->tlen -
dbt->doff - (dbt->dlen - dbt->size);
memmove(p + dbt->doff + dbt->size,
p + dbt->doff + dbt->dlen, len);
} else if (dbt->dlen < dbt->size) {
tlen += len = bo->tlen -
dbt->doff - (dbt->size - dbt->dlen);
memmove(p + dbt->doff + dbt->dlen,
p + dbt->doff + dbt->size, len);
} else
tlen += bo->tlen - dbt->doff;
/* Copy in the user's data. */
memcpy((u_int8_t *)t->bt_rdata.data + dbt->doff,
dbt->data, dbt->size);
tlen += dbt->size;
} else {
/* Take up to doff bytes from the record. */
memcpy(t->bt_rdata.data,
bk->data, dbt->doff > bk->len ? bk->len : dbt->doff);
tlen += dbt->doff;
/* Copy in the user's data. */
memcpy((u_int8_t *)t->bt_rdata.data +
dbt->doff, dbt->data, dbt->size);
tlen += dbt->size;
/* Copy in any remaining data. */
len = dbt->doff + dbt->dlen;
if (bk->len > len) {
memcpy((u_int8_t *)t->bt_rdata.data + dbt->doff +
dbt->size, bk->data + len, bk->len - len);
tlen += bk->len - len;
}
}
/* Set the DBT to reference our new record. */
t->bt_rdata.size = tlen;
t->bt_rdata.dlen = 0;
t->bt_rdata.doff = 0;
t->bt_rdata.flags = 0;
*dbt = t->bt_rdata;
return (0);
}

767
db2/btree/bt_rec.c Normal file
View File

@ -0,0 +1,767 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_rec.c 10.11 (Sleepycat) 8/22/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "shqueue.h"
#include "hash.h"
#include "btree.h"
#include "log.h"
#include "db_dispatch.h"
#include "common_ext.h"
/*
* __bam_pg_alloc_recover --
* Recovery function for pg_alloc.
*
* PUBLIC: int __bam_pg_alloc_recover
* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
*/
int
__bam_pg_alloc_recover(logp, dbtp, lsnp, redo, info)
DB_LOG *logp;
DBT *dbtp;
DB_LSN *lsnp;
int redo;
void *info;
{
__bam_pg_alloc_args *argp;
BTMETA *meta;
DB_MPOOLFILE *mpf;
PAGE *pagep;
DB *file_dbp, *mdbp;
db_pgno_t pgno;
int cmp_n, cmp_p, created, modified, ret;
REC_PRINT(__bam_pg_alloc_print);
REC_INTRO(__bam_pg_alloc_read);
/*
* Fix up the allocated page. If we're redoing the operation, we have
* to get the page (creating it if it doesn't exist), and update its
* LSN. If we're undoing the operation, we have to reset the page's
* LSN and put it on the free list.
*
* Fix up the metadata page. If we're redoing the operation, we have
* to get the metadata page and update its LSN and its free pointer.
* If we're undoing the operation and the page was ever created, we put
* it on the freelist.
*/
pgno = PGNO_METADATA;
if ((ret = memp_fget(mpf, &pgno, 0, &meta)) != 0) {
(void)__db_pgerr(file_dbp, pgno);
goto out;
}
if ((ret = memp_fget(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
(void)__db_pgerr(file_dbp, argp->pgno);
(void)memp_fput(mpf, meta, 0);
goto out;
}
/* Fix up the allocated page. */
created = IS_ZERO_LSN(LSN(pagep));
modified = 0;
cmp_n = log_compare(lsnp, &LSN(pagep));
cmp_p = log_compare(&LSN(pagep), &argp->page_lsn);
if ((created || cmp_p == 0) && redo) {
/* Need to redo update described. */
P_INIT(pagep, file_dbp->pgsize,
argp->pgno, PGNO_INVALID, PGNO_INVALID, 0, argp->ptype);
pagep->lsn = *lsnp;
modified = 1;
} else if ((created || cmp_n == 0) && !redo) {
/* Need to undo update described. */
P_INIT(pagep, file_dbp->pgsize,
argp->pgno, PGNO_INVALID, meta->free, 0, P_INVALID);
pagep->lsn = argp->page_lsn;
modified = 1;
}
if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
(void)__db_panic(file_dbp);
(void)memp_fput(mpf, meta, 0);
goto out;
}
/* Fix up the metadata page. */
modified = 0;
cmp_n = log_compare(lsnp, &LSN(meta));
cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
meta->lsn = *lsnp;
meta->free = argp->next;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
meta->lsn = argp->meta_lsn;
meta->free = argp->pgno;
modified = 1;
}
if ((ret = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
(void)__db_panic(file_dbp);
goto out;
}
*lsnp = argp->prev_lsn;
ret = 0;
out: REC_CLOSE;
}
/*
* __bam_pg_free_recover --
* Recovery function for pg_free.
*
* PUBLIC: int __bam_pg_free_recover
* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
*/
int
__bam_pg_free_recover(logp, dbtp, lsnp, redo, info)
DB_LOG *logp;
DBT *dbtp;
DB_LSN *lsnp;
int redo;
void *info;
{
__bam_pg_free_args *argp;
BTMETA *meta;
DB *file_dbp, *mdbp;
DB_MPOOLFILE *mpf;
PAGE *pagep;
db_pgno_t pgno;
int cmp_n, cmp_p, modified, ret;
REC_PRINT(__bam_pg_free_print);
REC_INTRO(__bam_pg_free_read);
/*
* Fix up the freed page. If we're redoing the operation we get the
* page and explicitly discard its contents, then update its LSN. If
* we're undoing the operation, we get the page and restore its header.
*/
if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
(void)__db_pgerr(file_dbp, argp->pgno);
goto out;
}
modified = 0;
cmp_n = log_compare(lsnp, &LSN(pagep));
cmp_p = log_compare(&LSN(pagep), &LSN(argp->header.data));
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
P_INIT(pagep, file_dbp->pgsize,
pagep->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
pagep->lsn = *lsnp;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
memcpy(pagep, argp->header.data, argp->header.size);
modified = 1;
}
if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
(void)__db_panic(file_dbp);
goto out;
}
/*
* Fix up the metadata page. If we're redoing or undoing the operation
* we get the page and update its LSN and free pointer.
*/
pgno = PGNO_METADATA;
if ((ret = memp_fget(mpf, &pgno, 0, &meta)) != 0) {
(void)__db_pgerr(file_dbp, pgno);
goto out;
}
modified = 0;
cmp_n = log_compare(lsnp, &LSN(meta));
cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
meta->free = argp->pgno;
meta->lsn = *lsnp;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
meta->free = argp->next;
meta->lsn = argp->meta_lsn;
modified = 1;
}
if ((ret = memp_fput(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
(void)__db_panic(file_dbp);
goto out;
}
*lsnp = argp->prev_lsn;
ret = 0;
out: REC_CLOSE;
}
/*
* __bam_split_recover --
* Recovery function for split.
*
* PUBLIC: int __bam_split_recover
* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
*/
int
__bam_split_recover(logp, dbtp, lsnp, redo, info)
DB_LOG *logp;
DBT *dbtp;
DB_LSN *lsnp;
int redo;
void *info;
{
__bam_split_args *argp;
DB *file_dbp, *mdbp;
DB_MPOOLFILE *mpf;
PAGE *_lp, *lp, *np, *pp, *_rp, *rp, *sp;
db_pgno_t pgno;
int l_update, p_update, r_update, ret, rootsplit, t_ret;
REC_PRINT(__bam_split_print);
mpf = NULL;
_lp = lp = np = pp = _rp = rp = NULL;
REC_INTRO(__bam_split_read);
/*
* There are two kinds of splits that we have to recover from. The
* first is a root-page split, where the root page is split from a
* leaf page into an internal page and two new leaf pages are created.
* The second is where a page is split into two pages, and a new key
* is inserted into the parent page.
*/
sp = argp->pg.data;
pgno = PGNO(sp);
rootsplit = pgno == PGNO_ROOT;
if (memp_fget(mpf, &argp->left, 0, &lp) != 0)
lp = NULL;
if (memp_fget(mpf, &argp->right, 0, &rp) != 0)
rp = NULL;
if (redo) {
l_update = r_update = p_update = 0;
/*
* Decide if we need to resplit the page.
*
* If this is a root split, then the root has to exist, it's
* the page we're splitting and it gets modified. If this is
* not a root split, then the left page has to exist, for the
* same reason.
*/
if (rootsplit) {
if ((ret = memp_fget(mpf, &pgno, 0, &pp)) != 0) {
(void)__db_pgerr(file_dbp, pgno);
pp = NULL;
goto out;
}
p_update =
log_compare(&LSN(pp), &LSN(argp->pg.data)) == 0;
} else
if (lp == NULL) {
(void)__db_pgerr(file_dbp, argp->left);
goto out;
}
if (lp == NULL || log_compare(&LSN(lp), &argp->llsn) == 0)
l_update = 1;
if (rp == NULL || log_compare(&LSN(rp), &argp->rlsn) == 0)
r_update = 1;
if (!p_update && !l_update && !r_update)
goto done;
/* Allocate and initialize new left/right child pages. */
if ((_lp = (PAGE *)malloc(file_dbp->pgsize)) == NULL)
goto nomem;
if ((_rp = (PAGE *)malloc(file_dbp->pgsize)) == NULL) {
nomem: errno = ENOMEM;
__db_err(file_dbp->dbenv, "%s", strerror(errno));
goto out;
}
if (rootsplit) {
P_INIT(_lp, file_dbp->pgsize, argp->left,
PGNO_INVALID,
ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
LEVEL(sp), TYPE(sp));
P_INIT(_rp, file_dbp->pgsize, argp->right,
ISINTERNAL(sp) ? PGNO_INVALID : argp->left,
PGNO_INVALID, LEVEL(sp), TYPE(sp));
} else {
P_INIT(_lp, file_dbp->pgsize, PGNO(sp),
ISINTERNAL(sp) ? PGNO_INVALID : PREV_PGNO(sp),
ISINTERNAL(sp) ? PGNO_INVALID : argp->right,
LEVEL(sp), TYPE(sp));
P_INIT(_rp, file_dbp->pgsize, argp->right,
ISINTERNAL(sp) ? PGNO_INVALID : sp->pgno,
ISINTERNAL(sp) ? PGNO_INVALID : NEXT_PGNO(sp),
LEVEL(sp), TYPE(sp));
}
/* Split the page. */
if ((ret = __bam_copy(file_dbp, sp, _lp, 0, argp->indx)) != 0 ||
(ret = __bam_copy(file_dbp, sp, _rp, argp->indx,
NUM_ENT(sp))) != 0)
goto out;
/* If the left child is wrong, update it. */
if (lp == NULL && (ret =
memp_fget(mpf, &argp->left, DB_MPOOL_CREATE, &lp)) != 0) {
(void)__db_pgerr(file_dbp, argp->left);
lp = NULL;
goto out;
}
if (l_update) {
memcpy(lp, _lp, file_dbp->pgsize);
lp->lsn = *lsnp;
if ((ret = memp_fput(mpf, lp, DB_MPOOL_DIRTY)) != 0)
goto fatal;
lp = NULL;
}
/* If the right child is wrong, update it. */
if (rp == NULL && (ret = memp_fget(mpf,
&argp->right, DB_MPOOL_CREATE, &rp)) != 0) {
(void)__db_pgerr(file_dbp, argp->right);
rp = NULL;
goto out;
}
if (r_update) {
memcpy(rp, _rp, file_dbp->pgsize);
rp->lsn = *lsnp;
if ((ret = memp_fput(mpf, rp, DB_MPOOL_DIRTY)) != 0)
goto fatal;
rp = NULL;
}
/*
* If the parent page is wrong, update it. This is of interest
* only if it was a root split, since root splits create parent
* pages. All other splits modify a parent page, but those are
* separately logged and recovered.
*/
if (rootsplit && p_update) {
if (file_dbp->type == DB_BTREE)
P_INIT(pp, file_dbp->pgsize,
PGNO_ROOT, PGNO_INVALID, PGNO_INVALID,
_lp->level + 1, P_IBTREE);
else
P_INIT(pp, file_dbp->pgsize,
PGNO_ROOT, PGNO_INVALID, PGNO_INVALID,
_lp->level + 1, P_IRECNO);
RE_NREC_SET(pp,
file_dbp->type == DB_RECNO ||
F_ISSET(file_dbp, DB_BT_RECNUM) ?
__bam_total(_lp) + __bam_total(_rp) : 0);
pp->lsn = *lsnp;
if ((ret = memp_fput(mpf, pp, DB_MPOOL_DIRTY)) != 0)
goto fatal;
pp = NULL;
}
/*
* Finally, redo the next-page link if necessary. This is of
* interest only if it wasn't a root split -- inserting a new
* page in the tree requires that any following page have its
* previous-page pointer updated to our new page. The next
* page had better exist.
*/
if (!rootsplit && !IS_ZERO_LSN(argp->nlsn)) {
if ((ret = memp_fget(mpf, &argp->npgno, 0, &np)) != 0) {
(void)__db_pgerr(file_dbp, argp->npgno);
np = NULL;
goto out;
}
if (log_compare(&LSN(np), &argp->nlsn) == 0) {
PREV_PGNO(np) = argp->right;
np->lsn = *lsnp;
if ((ret = memp_fput(mpf,
np, DB_MPOOL_DIRTY)) != 0)
goto fatal;
np = NULL;
}
}
} else {
/*
* If the split page is wrong, replace its contents with the
* logged page contents. The split page had better exist.
*/
if ((ret = memp_fget(mpf, &pgno, 0, &pp)) != 0) {
(void)__db_pgerr(file_dbp, pgno);
pp = NULL;
goto out;
}
if (log_compare(lsnp, &LSN(pp)) == 0) {
memcpy(pp, argp->pg.data, argp->pg.size);
if ((ret = memp_fput(mpf, pp, DB_MPOOL_DIRTY)) != 0)
goto fatal;
pp = NULL;
}
/*
* If it's a root split and the left child ever existed, put
* it on the free list. (If it's not a root split, we just
* updated the left page -- it's the same as the split page.)
* If the right child ever existed, root split or not, put it
* on the free list.
*/
if ((rootsplit && lp != NULL) || rp != NULL) {
if (rootsplit && lp != NULL &&
log_compare(lsnp, &LSN(lp)) == 0) {
lp->lsn = argp->llsn;
if ((ret =
memp_fput(mpf, lp, DB_MPOOL_DIRTY)) != 0)
goto fatal;
lp = NULL;
}
if (rp != NULL &&
log_compare(lsnp, &LSN(rp)) == 0) {
rp->lsn = argp->rlsn;
if ((ret =
memp_fput(mpf, rp, DB_MPOOL_DIRTY)) != 0)
goto fatal;
rp = NULL;
}
}
/*
* Finally, undo the next-page link if necessary. This is of
* interest only if it wasn't a root split -- inserting a new
* page in the tree requires that any following page have its
* previous-page pointer updated to our new page. The next
* page had better exist.
*/
if (!rootsplit && !IS_ZERO_LSN(argp->nlsn)) {
if ((ret = memp_fget(mpf, &argp->npgno, 0, &np)) != 0) {
(void)__db_pgerr(file_dbp, argp->npgno);
np = NULL;
goto out;
}
if (log_compare(lsnp, &LSN(np)) == 0) {
PREV_PGNO(np) = argp->left;
np->lsn = argp->nlsn;
if (memp_fput(mpf, np, DB_MPOOL_DIRTY))
goto fatal;
np = NULL;
}
}
}
done: ret = 0;
*lsnp = argp->prev_lsn;
if (0) {
fatal: (void)__db_panic(file_dbp);
}
out: /* Free any pages that weren't dirtied. */
if (pp != NULL && (t_ret = memp_fput(mpf, pp, 0)) != 0 && ret == 0)
ret = t_ret;
if (lp != NULL && (t_ret = memp_fput(mpf, lp, 0)) != 0 && ret == 0)
ret = t_ret;
if (np != NULL && (t_ret = memp_fput(mpf, np, 0)) != 0 && ret == 0)
ret = t_ret;
if (rp != NULL && (t_ret = memp_fput(mpf, rp, 0)) != 0 && ret == 0)
ret = t_ret;
/* Free any allocated space. */
if (_lp != NULL)
free(_lp);
if (_rp != NULL)
free(_rp);
REC_CLOSE;
}
/*
* __bam_rsplit_recover --
* Recovery function for a reverse split.
*
* PUBLIC: int __bam_rsplit_recover
* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
*/
int
__bam_rsplit_recover(logp, dbtp, lsnp, redo, info)
DB_LOG *logp;
DBT *dbtp;
DB_LSN *lsnp;
int redo;
void *info;
{
__bam_rsplit_args *argp;
DB *file_dbp, *mdbp;
DB_MPOOLFILE *mpf;
PAGE *pagep;
db_pgno_t pgno;
int cmp_n, cmp_p, modified, ret;
REC_PRINT(__bam_rsplit_print);
REC_INTRO(__bam_rsplit_read);
/* Fix the root page. */
pgno = PGNO_ROOT;
if ((ret = memp_fget(mpf, &pgno, 0, &pagep)) != 0) {
__db_pgerr(file_dbp, pgno);
pagep = NULL;
goto out;
}
modified = 0;
cmp_n = log_compare(lsnp, &LSN(pagep));
cmp_p = log_compare(&LSN(pagep), &argp->rootlsn);
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
pagep->pgno = PGNO_ROOT;
pagep->lsn = *lsnp;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
P_INIT(pagep, file_dbp->pgsize, PGNO_ROOT,
PGNO_INVALID, PGNO_INVALID, pagep->level + 1, TYPE(pagep));
if ((ret = __db_pitem(file_dbp, pagep, 0,
argp->rootent.size, &argp->rootent, NULL)) != 0)
goto out;
pagep->lsn = argp->rootlsn;
modified = 1;
}
if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
(void)__db_panic(file_dbp);
goto out;
}
/* Fix the page copied over the root page. */
if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
(void)__db_pgerr(file_dbp, argp->pgno);
pagep = NULL;
goto out;
}
modified = 0;
cmp_n = log_compare(lsnp, &LSN(pagep));
cmp_p = log_compare(&LSN(pagep), &LSN(argp->pgdbt.data));
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
pagep->lsn = *lsnp;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
memcpy(pagep, argp->pgdbt.data, argp->pgdbt.size);
modified = 1;
}
if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0) {
(void)__db_panic(file_dbp);
goto out;
}
ret = 0;
*lsnp = argp->prev_lsn;
out: REC_CLOSE;
}
/*
* __bam_adj_recover --
* Recovery function for adj.
*
* PUBLIC: int __bam_adj_recover
* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
*/
int
__bam_adj_recover(logp, dbtp, lsnp, redo, info)
DB_LOG *logp;
DBT *dbtp;
DB_LSN *lsnp;
int redo;
void *info;
{
__bam_adj_args *argp;
DB *file_dbp, *mdbp;
DB_MPOOLFILE *mpf;
PAGE *pagep;
int cmp_n, cmp_p, modified, ret;
REC_PRINT(__bam_adj_print);
REC_INTRO(__bam_adj_read);
if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
(void)__db_pgerr(file_dbp, argp->pgno);
pagep = NULL;
goto out;
}
modified = 0;
cmp_n = log_compare(lsnp, &LSN(pagep));
cmp_p = log_compare(&LSN(pagep), &argp->lsn);
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
if ((ret = __bam_adjindx(file_dbp,
pagep, argp->indx, argp->indx_copy, argp->is_insert)) != 0)
goto err;
LSN(pagep) = *lsnp;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
if ((ret = __bam_adjindx(file_dbp,
pagep, argp->indx, argp->indx_copy, !argp->is_insert)) != 0)
goto err;
LSN(pagep) = argp->lsn;
modified = 1;
}
if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) == 0)
*lsnp = argp->prev_lsn;
if (0) {
err: (void)memp_fput(mpf, pagep, 0);
}
out: REC_CLOSE;
}
/*
* __bam_cadjust_recover --
* Recovery function for the adjust of a count change in an internal
* page.
*
* PUBLIC: int __bam_cadjust_recover
* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
*/
int
__bam_cadjust_recover(logp, dbtp, lsnp, redo, info)
DB_LOG *logp;
DBT *dbtp;
DB_LSN *lsnp;
int redo;
void *info;
{
__bam_cadjust_args *argp;
DB *file_dbp, *mdbp;
DB_MPOOLFILE *mpf;
PAGE *pagep;
int cmp_n, cmp_p, modified, ret;
REC_PRINT(__bam_cadjust_print);
REC_INTRO(__bam_cadjust_read);
if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
errno = __db_pgerr(file_dbp, argp->pgno);
pagep = NULL;
goto out;
}
modified = 0;
cmp_n = log_compare(lsnp, &LSN(pagep));
cmp_p = log_compare(&LSN(pagep), &argp->lsn);
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
if (file_dbp->type == DB_BTREE &&
F_ISSET(file_dbp, DB_BT_RECNUM)) {
GET_BINTERNAL(pagep, argp->indx)->nrecs += argp->adjust;
if (argp->total && PGNO(pagep) == PGNO_ROOT)
RE_NREC_ADJ(pagep, argp->adjust);
}
if (file_dbp->type == DB_RECNO) {
GET_RINTERNAL(pagep, argp->indx)->nrecs += argp->adjust;
if (argp->total && PGNO(pagep) == PGNO_ROOT)
RE_NREC_ADJ(pagep, argp->adjust);
}
LSN(pagep) = *lsnp;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
if (file_dbp->type == DB_BTREE &&
F_ISSET(file_dbp, DB_BT_RECNUM)) {
GET_BINTERNAL(pagep, argp->indx)->nrecs -= argp->adjust;
if (argp->total && PGNO(pagep) == PGNO_ROOT)
RE_NREC_ADJ(pagep, argp->adjust);
}
if (file_dbp->type == DB_RECNO) {
GET_RINTERNAL(pagep, argp->indx)->nrecs -= argp->adjust;
if (argp->total && PGNO(pagep) == PGNO_ROOT)
RE_NREC_ADJ(pagep, -(argp->adjust));
}
LSN(pagep) = argp->lsn;
modified = 1;
}
if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) == 0)
*lsnp = argp->prev_lsn;
out: REC_CLOSE;
}
/*
* __bam_cdel_recover --
* Recovery function for the intent-to-delete of a cursor record.
*
* PUBLIC: int __bam_cdel_recover
* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
*/
int
__bam_cdel_recover(logp, dbtp, lsnp, redo, info)
DB_LOG *logp;
DBT *dbtp;
DB_LSN *lsnp;
int redo;
void *info;
{
__bam_cdel_args *argp;
DB *file_dbp, *mdbp;
DB_MPOOLFILE *mpf;
PAGE *pagep;
int cmp_n, cmp_p, modified, ret;
REC_PRINT(__bam_cdel_print);
REC_INTRO(__bam_cdel_read);
if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
(void)__db_pgerr(file_dbp, argp->pgno);
pagep = NULL;
goto out;
}
modified = 0;
cmp_n = log_compare(lsnp, &LSN(pagep));
cmp_p = log_compare(&LSN(pagep), &argp->lsn);
if (cmp_p == 0 && redo) {
/* Need to redo update described. */
GET_BKEYDATA(pagep, argp->indx + O_INDX)->deleted = 1;
LSN(pagep) = *lsnp;
modified = 1;
} else if (cmp_n == 0 && !redo) {
/* Need to undo update described. */
GET_BKEYDATA(pagep, argp->indx + O_INDX)->deleted = 0;
LSN(pagep) = argp->lsn;
modified = 1;
}
if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) == 0)
*lsnp = argp->prev_lsn;
out: REC_CLOSE;
}

1195
db2/btree/bt_recno.c Normal file
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File diff suppressed because it is too large Load Diff

347
db2/btree/bt_rsearch.c Normal file
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@ -0,0 +1,347 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_rsearch.c 10.8 (Sleepycat) 8/24/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
/*
* __bam_rsearch --
* Search a btree for a record number.
*
* PUBLIC: int __bam_rsearch __P((DB *, db_recno_t *, u_int, int, int *));
*/
int
__bam_rsearch(dbp, recnop, flags, stop, exactp)
DB *dbp;
db_recno_t *recnop;
u_int flags;
int stop, *exactp;
{
BINTERNAL *bi;
BTREE *t;
DB_LOCK lock;
PAGE *h;
RINTERNAL *ri;
db_indx_t indx, top;
db_pgno_t pg;
db_recno_t recno, total;
int isappend, ret, stack;
t = dbp->internal;
/*
* We test for groups of flags, S_APPEND is the only one that can be
* OR'd into the set. Clear it now so that the tests for equality
* will work.
*/
if ((isappend = LF_ISSET(S_APPEND)) != 0)
LF_CLR(S_APPEND);
/*
* There are several ways we search a btree tree. The flags argument
* specifies if we're acquiring read or write locks and if we are
* locking pairs of pages. See btree.h for more details.
*
* If write-locking pages, we need to know whether or not to acquire a
* write lock on a page before getting it. This depends on how deep it
* is in tree, which we don't know until we acquire the root page. So,
* if we need to lock the root page we may have to upgrade it later,
* because we won't get the correct lock initially.
*
* Retrieve the root page.
*/
pg = PGNO_ROOT;
if ((ret = __bam_lget(dbp, 0, PGNO_ROOT,
flags == S_INSERT || flags == S_DELETE ?
DB_LOCK_WRITE : DB_LOCK_READ, &lock)) != 0)
return (ret);
if ((ret = __bam_pget(dbp, &h, &pg, 0)) != 0) {
(void)__BT_LPUT(dbp, lock);
return (ret);
}
total = RE_NREC(h);
/*
* If appending to the tree, set the record number now -- we have the
* root page locked.
*
* Delete only deletes exact matches, read only returns exact matches.
* Note, this is different from __bam_search(), which returns non-exact
* matches for read.
*
* The record may not exist. We can only return the correct location
* for the record immediately after the last record in the tree, so do
* a fast check now.
*/
if (isappend) {
*exactp = 0;
*recnop = recno = total + 1;
} else {
recno = *recnop;
if (recno <= total)
*exactp = 1;
else {
*exactp = 0;
if (flags == S_DELETE ||
flags == S_FIND || recno > total + 1) {
(void)memp_fput(dbp->mpf, h, 0);
(void)__BT_LPUT(dbp, lock);
return (DB_NOTFOUND);
}
}
}
/* Decide if we're building a stack based on the operation. */
BT_STK_CLR(t);
stack = flags == S_DELETE || flags == S_INSERT;
/*
* Decide if we need to save this page; if we do, write lock it, and
* start to build a stack.
*/
if (LF_ISSET(S_PARENT) && (u_int8_t)(stop + 1) >= h->level) {
(void)memp_fput(dbp->mpf, h, 0);
if ((ret = __bam_lget(dbp, 1, pg, DB_LOCK_WRITE, &lock)) != 0)
return (ret);
if ((ret = __bam_pget(dbp, &h, &pg, 0)) != 0) {
(void)__BT_LPUT(dbp, lock);
return (ret);
}
stack = 1;
}
/* Records in the tree are 0-based, and record numbers are 1-based. */
--recno;
for (total = 0;;) {
switch (TYPE(h)) {
case P_LBTREE:
BT_STK_ENTER(t, h, (recno - total) * P_INDX, lock, ret);
return (ret);
case P_IBTREE:
for (indx = 0, top = NUM_ENT(h);;) {
bi = GET_BINTERNAL(h, indx);
if (++indx == top || total + bi->nrecs > recno)
break;
total += bi->nrecs;
}
pg = bi->pgno;
break;
case P_LRECNO:
BT_STK_ENTER(t, h, recno - total, lock, ret);
return (ret);
case P_IRECNO:
for (indx = 0, top = NUM_ENT(h);;) {
ri = GET_RINTERNAL(h, indx);
if (++indx == top || total + ri->nrecs > recno)
break;
total += ri->nrecs;
}
pg = ri->pgno;
break;
default:
return (__db_pgfmt(dbp, h->pgno));
}
--indx;
if (stack) {
/* Return if this is the lowest page wanted. */
if (LF_ISSET(S_PARENT) && stop == h->level) {
BT_STK_ENTER(t, h, indx, lock, ret);
return (ret);
}
BT_STK_PUSH(t, h, indx, lock, ret);
if (ret)
goto err;
if ((ret = __bam_lget(dbp, 0, pg,
LF_ISSET(S_WRITE) ? DB_LOCK_WRITE : DB_LOCK_READ,
&lock)) != 0)
goto err;
} else {
(void)memp_fput(dbp->mpf, h, 0);
/*
* Decide if we want to return a pointer to the next
* page in the stack. If we do, write lock it and
* never unlock it.
*/
if (LF_ISSET(S_PARENT) &&
(u_int8_t)(stop + 1) >= (u_int8_t)(h->level - 1))
stack = 1;
if ((ret = __bam_lget(dbp, 1, pg,
LF_ISSET(S_WRITE) ? DB_LOCK_WRITE : DB_LOCK_READ,
&lock)) != 0)
goto err;
}
if ((ret = __bam_pget(dbp, &h, &pg, 0)) != 0)
goto err;
}
/* NOTREACHED */
err: BT_STK_POP(t);
__bam_stkrel(dbp);
return (ret);
}
/*
* __bam_adjust --
* Adjust the tree after adding or deleting a record.
*
* PUBLIC: int __bam_adjust __P((DB *, BTREE *, int));
*/
int
__bam_adjust(dbp, t, adjust)
DB *dbp;
BTREE *t;
int adjust;
{
EPG *epg;
PAGE *h;
int ret;
/* Update the record counts for the tree. */
for (epg = t->bt_sp; epg <= t->bt_csp; ++epg) {
h = epg->page;
if (TYPE(h) == P_IBTREE || TYPE(h) == P_IRECNO) {
if (DB_LOGGING(dbp) &&
(ret = __bam_cadjust_log(dbp->dbenv->lg_info,
dbp->txn, &LSN(h), 0, dbp->log_fileid,
PGNO(h), &LSN(h), (u_int32_t)epg->indx,
(int32_t)adjust, 1)) != 0)
return (ret);
if (TYPE(h) == P_IBTREE)
GET_BINTERNAL(h, epg->indx)->nrecs += adjust;
else
GET_RINTERNAL(h, epg->indx)->nrecs += adjust;
if (PGNO(h) == PGNO_ROOT)
RE_NREC_ADJ(h, adjust);
if ((ret = memp_fset(dbp->mpf, h, DB_MPOOL_DIRTY)) != 0)
return (ret);
}
}
return (0);
}
/*
* __bam_nrecs --
* Return the number of records in the tree.
*
* PUBLIC: int __bam_nrecs __P((DB *, db_recno_t *));
*/
int
__bam_nrecs(dbp, rep)
DB *dbp;
db_recno_t *rep;
{
DB_LOCK lock;
PAGE *h;
db_pgno_t pgno;
int ret;
pgno = PGNO_ROOT;
if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_READ, &lock)) != 0)
return (ret);
if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0)
return (ret);
*rep = RE_NREC(h);
(void)memp_fput(dbp->mpf, h, 0);
(void)__BT_TLPUT(dbp, lock);
return (0);
}
/*
* __bam_total --
* Return the number of records below a page.
*
* PUBLIC: db_recno_t __bam_total __P((PAGE *));
*/
db_recno_t
__bam_total(h)
PAGE *h;
{
db_recno_t recs;
db_indx_t nxt, top;
switch (TYPE(h)) {
case P_LBTREE:
recs = NUM_ENT(h) / 2;
break;
case P_IBTREE:
for (recs = 0, nxt = 0, top = NUM_ENT(h); nxt < top; ++nxt)
recs += GET_BINTERNAL(h, nxt)->nrecs;
break;
case P_LRECNO:
recs = NUM_ENT(h);
break;
case P_IRECNO:
for (recs = 0, nxt = 0, top = NUM_ENT(h); nxt < top; ++nxt)
recs += GET_RINTERNAL(h, nxt)->nrecs;
break;
default:
abort();
}
return (recs);
}

335
db2/btree/bt_search.c Normal file
View File

@ -0,0 +1,335 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_search.c 10.6 (Sleepycat) 8/22/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
/*
* __bam_search --
* Search a btree for a key.
*
* PUBLIC: int __bam_search __P((DB *,
* PUBLIC: const DBT *, u_int, int, db_recno_t *, int *));
*/
int
__bam_search(dbp, key, flags, stop, recnop, exactp)
DB *dbp;
const DBT *key;
u_int flags;
int stop, *exactp;
db_recno_t *recnop;
{
BTREE *t;
DB_LOCK lock;
EPG cur;
PAGE *h;
db_indx_t base, i, indx, lim;
db_pgno_t pg;
db_recno_t recno;
int cmp, jump, ret, stack;
t = dbp->internal;
recno = 0;
BT_STK_CLR(t);
/*
* There are several ways we search a btree tree. The flags argument
* specifies if we're acquiring read or write locks, if we position
* to the first or last item in a set of duplicates, if we return
* deleted items, and if we are locking pairs of pages. See btree.h
* for more details. In addition, if we're doing record numbers, we
* have to lock the entire tree regardless.
*
* If write-locking pages, we need to know whether or not to acquire a
* write lock on a page before getting it. This depends on how deep it
* is in tree, which we don't know until we acquire the root page. So,
* if we need to lock the root page we may have to upgrade it later,
* because we won't get the correct lock initially.
*
* Retrieve the root page.
*/
pg = PGNO_ROOT;
stack = F_ISSET(dbp, DB_BT_RECNUM) &&
(flags == S_INSERT || flags == S_DELETE);
if ((ret = __bam_lget(dbp,
0, pg, stack ? DB_LOCK_WRITE : DB_LOCK_READ, &lock)) != 0)
return (ret);
if ((ret = __bam_pget(dbp, &h, &pg, 0)) != 0) {
(void)__BT_LPUT(dbp, lock);
return (ret);
}
/* Decide if we need to save this page; if we do, write lock it. */
if (!stack &&
((LF_ISSET(S_PARENT) && (u_int8_t)(stop + 1) >= h->level) ||
(LF_ISSET(S_WRITE) && h->level == LEAFLEVEL))) {
(void)memp_fput(dbp->mpf, h, 0);
if ((ret = __bam_lget(dbp, 1, pg, DB_LOCK_WRITE, &lock)) != 0)
return (ret);
if ((ret = __bam_pget(dbp, &h, &pg, 0)) != 0) {
(void)__BT_LPUT(dbp, lock);
return (ret);
}
stack = 1;
}
for (;;) {
/*
* Do a binary search on the current page. If we're searching
* a leaf page, we have to manipulate the indices in groups of
* two. If we're searching an internal page, they're an index
* per page item. If we find an exact match on a leaf page,
* we're done.
*/
cur.page = h;
jump = TYPE(h) == P_LBTREE ? P_INDX : O_INDX;
for (base = 0,
lim = NUM_ENT(h) / (db_indx_t)jump; lim != 0; lim >>= 1) {
cur.indx = indx = base + ((lim >> 1) * jump);
if ((cmp = __bam_cmp(dbp, key, &cur)) == 0) {
if (TYPE(h) == P_LBTREE)
goto match;
goto next;
}
if (cmp > 0) {
base = indx + jump;
--lim;
}
}
/*
* No match found. Base is the smallest index greater than
* key and may be zero or a last + O_INDX index.
*
* If it's a leaf page, return base as the "found" value.
* Delete only deletes exact matches.
*/
if (TYPE(h) == P_LBTREE) {
*exactp = 0;
if (LF_ISSET(S_EXACT))
goto notfound;
BT_STK_ENTER(t, h, base, lock, ret);
return (ret);
}
/*
* If it's not a leaf page, record the internal page (which is
* a parent page for the key). Decrement the base by 1 if it's
* non-zero so that if a split later occurs, the inserted page
* will be to the right of the saved page.
*/
indx = base > 0 ? base - O_INDX : base;
/*
* If we're trying to calculate the record number, sum up
* all the record numbers on this page up to the indx point.
*/
if (recnop != NULL)
for (i = 0; i < indx; ++i)
recno += GET_BINTERNAL(h, i)->nrecs;
next: pg = GET_BINTERNAL(h, indx)->pgno;
if (stack) {
/* Return if this is the lowest page wanted. */
if (LF_ISSET(S_PARENT) && stop == h->level) {
BT_STK_ENTER(t, h, indx, lock, ret);
return (ret);
}
BT_STK_PUSH(t, h, indx, lock, ret);
if (ret != 0)
goto err;
if ((ret =
__bam_lget(dbp, 0, pg, DB_LOCK_WRITE, &lock)) != 0)
goto err;
} else {
(void)memp_fput(dbp->mpf, h, 0);
/*
* Decide if we want to return a pointer to the next
* page in the stack. If we do, write lock it and
* never unlock it.
*/
if ((LF_ISSET(S_PARENT) &&
(u_int8_t)(stop + 1) >= (u_int8_t)(h->level - 1)) ||
(h->level - 1) == LEAFLEVEL)
stack = 1;
if ((ret =
__bam_lget(dbp, 1, pg, stack && LF_ISSET(S_WRITE) ?
DB_LOCK_WRITE : DB_LOCK_READ, &lock)) != 0)
goto err;
}
if ((ret = __bam_pget(dbp, &h, &pg, 0)) != 0)
goto err;
}
/* NOTREACHED */
match: *exactp = 1;
/*
* If we're trying to calculate the record number, add in the
* offset on this page and correct for the fact that records
* in the tree are 0-based.
*/
if (recnop != NULL)
*recnop = recno + (indx / P_INDX) + 1;
/*
* If we got here, we know that we have a btree leaf page.
*
* If there are duplicates, go to the first/last one.
*/
if (LF_ISSET(S_DUPLAST))
while (indx < (db_indx_t)(NUM_ENT(h) - P_INDX) &&
h->inp[indx] == h->inp[indx + P_INDX])
indx += P_INDX;
else
while (indx > 0 &&
h->inp[indx] == h->inp[indx - P_INDX])
indx -= P_INDX;
/*
* Now check if we are allowed to return deleted item; if not
* find/last the first non-deleted item.
*/
if (LF_ISSET(S_DELNO)) {
if (LF_ISSET(S_DUPLAST))
while (GET_BKEYDATA(h, indx + O_INDX)->deleted &&
indx > 0 &&
h->inp[indx] == h->inp[indx - P_INDX])
indx -= P_INDX;
else
while (GET_BKEYDATA(h, indx + O_INDX)->deleted &&
indx < (db_indx_t)(NUM_ENT(h) - P_INDX) &&
h->inp[indx] == h->inp[indx + P_INDX])
indx += P_INDX;
if (GET_BKEYDATA(h, indx + O_INDX)->deleted)
goto notfound;
}
BT_STK_ENTER(t, h, indx, lock, ret);
return (ret);
notfound:
(void)memp_fput(dbp->mpf, h, 0);
(void)__BT_LPUT(dbp, lock);
ret = DB_NOTFOUND;
err: if (t->bt_csp > t->bt_sp) {
BT_STK_POP(t);
__bam_stkrel(dbp);
}
return (ret);
}
/*
* __bam_stkrel --
* Release all pages currently held in the stack.
*
* PUBLIC: int __bam_stkrel __P((DB *));
*/
int
__bam_stkrel(dbp)
DB *dbp;
{
BTREE *t;
EPG *epg;
t = dbp->internal;
for (epg = t->bt_sp; epg <= t->bt_csp; ++epg) {
(void)memp_fput(dbp->mpf, epg->page, 0);
(void)__BT_TLPUT(dbp, epg->lock);
}
return (0);
}
/*
* __bam_stkgrow --
* Grow the stack.
*
* PUBLIC: int __bam_stkgrow __P((BTREE *));
*/
int
__bam_stkgrow(t)
BTREE *t;
{
EPG *p;
size_t entries;
entries = t->bt_esp - t->bt_sp;
if ((p = (EPG *)calloc(entries * 2, sizeof(EPG))) == NULL)
return (ENOMEM);
memcpy(p, t->bt_sp, entries * sizeof(EPG));
if (t->bt_sp != t->bt_stack)
FREE(t->bt_sp, entries * sizeof(EPG));
t->bt_sp = p;
t->bt_csp = p + entries;
t->bt_esp = p + entries * 2;
return (0);
}

952
db2/btree/bt_split.c Normal file
View File

@ -0,0 +1,952 @@
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*/
/*
* Copyright (c) 1990, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_split.c 10.12 (Sleepycat) 8/24/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
static int __bam_page __P((DB *, EPG *, EPG *));
static int __bam_pinsert __P((DB *, EPG *, PAGE *, PAGE *));
static int __bam_psplit __P((DB *, EPG *, PAGE *, PAGE *, int));
static int __bam_root __P((DB *, EPG *));
/*
* __bam_split --
* Split a page.
*
* PUBLIC: int __bam_split __P((DB *, void *));
*/
int
__bam_split(dbp, arg)
DB *dbp;
void *arg;
{
BTREE *t;
enum { UP, DOWN } dir;
int exact, level, ret;
t = dbp->internal;
/*
* The locking protocol we use to avoid deadlock to acquire locks by
* walking down the tree, but we do it as lazily as possible, locking
* the root only as a last resort. We expect all stack pages to have
* been discarded before we're called; we discard all short-term locks.
*
* When __bam_split is first called, we know that a leaf page was too
* full for an insert. We don't know what leaf page it was, but we
* have the key/recno that caused the problem. We call XX_search to
* reacquire the leaf page, but this time get both the leaf page and
* its parent, locked. We then split the leaf page and see if the new
* internal key will fit into the parent page. If it will, we're done.
*
* If it won't, we discard our current locks and repeat the process,
* only this time acquiring the parent page and its parent, locked.
* This process repeats until we succeed in the split, splitting the
* root page as the final resort. The entire process then repeats,
* as necessary, until we split a leaf page.
*
* XXX
* A traditional method of speeding this up is to maintain a stack of
* the pages traversed in the original search. You can detect if the
* stack is correct by storing the page's LSN when it was searched and
* comparing that LSN with the current one when it's locked during the
* split. This would be an easy change for this code, but I have no
* numbers that indicate it's worthwhile.
*/
for (dir = UP, level = LEAFLEVEL;; dir == UP ? ++level : --level) {
/*
* Acquire a page and its parent, locked.
*/
if ((ret = (dbp->type == DB_BTREE ?
__bam_search(dbp, arg, S_WRPAIR, level, NULL, &exact) :
__bam_rsearch(dbp,
(db_recno_t *)arg, S_WRPAIR, level, &exact))) != 0)
return (ret);
/* Split the page. */
ret = t->bt_csp[0].page->pgno == PGNO_ROOT ?
__bam_root(dbp, &t->bt_csp[0]) :
__bam_page(dbp, &t->bt_csp[-1], &t->bt_csp[0]);
switch (ret) {
case 0:
/* Once we've split the leaf page, we're done. */
if (level == LEAFLEVEL)
return (0);
/* Switch directions. */
if (dir == UP)
dir = DOWN;
break;
case DB_NEEDSPLIT:
/*
* It's possible to fail to split repeatedly, as other
* threads may be modifying the tree, or the page usage
* is sufficiently bad that we don't get enough space
* the first time.
*/
if (dir == DOWN)
dir = UP;
break;
default:
return (ret);
}
}
/* NOTREACHED */
}
/*
* __bam_root --
* Split the root page of a btree.
*/
static int
__bam_root(dbp, cp)
DB *dbp;
EPG *cp;
{
BTREE *t;
PAGE *lp, *rp;
int ret;
t = dbp->internal;
/* Yeah, right. */
if (cp->page->level >= MAXBTREELEVEL)
return (ENOSPC);
/* Create new left and right pages for the split. */
lp = rp = NULL;
if ((ret = __bam_new(dbp, TYPE(cp->page), &lp)) != 0 ||
(ret = __bam_new(dbp, TYPE(cp->page), &rp)) != 0)
goto err;
P_INIT(lp, dbp->pgsize, lp->pgno,
PGNO_INVALID, ISINTERNAL(cp->page) ? PGNO_INVALID : rp->pgno,
cp->page->level, TYPE(cp->page));
P_INIT(rp, dbp->pgsize, rp->pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : lp->pgno, PGNO_INVALID,
cp->page->level, TYPE(cp->page));
/* Split the page. */
if ((ret = __bam_psplit(dbp, cp, lp, rp, 1)) != 0)
goto err;
/* Log the change. */
if (DB_LOGGING(dbp)) {
DBT __a;
DB_LSN __lsn;
memset(&__a, 0, sizeof(__a));
__a.data = cp->page;
__a.size = dbp->pgsize;
ZERO_LSN(__lsn);
if ((ret = __bam_split_log(dbp->dbenv->lg_info, dbp->txn,
&LSN(cp->page), 0, dbp->log_fileid, PGNO(lp), &LSN(lp),
PGNO(rp), &LSN(rp), (u_int32_t)NUM_ENT(lp), 0, &__lsn,
&__a)) != 0)
goto err;
LSN(lp) = LSN(rp) = LSN(cp->page);
}
/* Clean up the new root page. */
if ((ret = (dbp->type == DB_RECNO ?
__ram_root(dbp, cp->page, lp, rp) :
__bam_broot(dbp, cp->page, lp, rp))) != 0)
goto err;
/* Success -- write the real pages back to the store. */
(void)memp_fput(dbp->mpf, cp->page, DB_MPOOL_DIRTY);
(void)__BT_TLPUT(dbp, cp->lock);
(void)memp_fput(dbp->mpf, lp, DB_MPOOL_DIRTY);
(void)memp_fput(dbp->mpf, rp, DB_MPOOL_DIRTY);
++t->lstat.bt_split;
++t->lstat.bt_rootsplit;
return (0);
err: if (lp != NULL)
(void)__bam_free(dbp, lp);
if (rp != NULL)
(void)__bam_free(dbp, rp);
(void)memp_fput(dbp->mpf, cp->page, 0);
(void)__BT_TLPUT(dbp, cp->lock);
return (ret);
}
/*
* __bam_page --
* Split the non-root page of a btree.
*/
static int
__bam_page(dbp, pp, cp)
DB *dbp;
EPG *pp, *cp;
{
BTREE *t;
DB_LOCK tplock;
PAGE *lp, *rp, *tp;
int ret;
t = dbp->internal;
lp = rp = tp = NULL;
ret = -1;
/* Create new right page for the split. */
if ((ret = __bam_new(dbp, TYPE(cp->page), &rp)) != 0)
return (ret);
P_INIT(rp, dbp->pgsize, rp->pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : cp->page->pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : cp->page->next_pgno,
cp->page->level, TYPE(cp->page));
/* Create new left page for the split. */
if ((lp = (PAGE *)malloc(dbp->pgsize)) == NULL) {
ret = ENOMEM;
goto err;
}
#ifdef DEBUG
memset(lp, 0xff, dbp->pgsize);
#endif
P_INIT(lp, dbp->pgsize, cp->page->pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : cp->page->prev_pgno,
ISINTERNAL(cp->page) ? PGNO_INVALID : rp->pgno,
cp->page->level, TYPE(cp->page));
ZERO_LSN(lp->lsn);
/*
* Split right.
*
* Only the indices are sorted on the page, i.e., the key/data pairs
* aren't, so it's simpler to copy the data from the split page onto
* two new pages instead of copying half the data to the right page
* and compacting the left page in place. Since the left page can't
* change, we swap the original and the allocated left page after the
* split.
*/
if ((ret = __bam_psplit(dbp, cp, lp, rp, 0)) != 0)
goto err;
/*
* Fix up the previous pointer of any leaf page following the split
* page.
*
* !!!
* There are interesting deadlock situations here as we write-lock a
* page that's not in our direct ancestry. Consider a cursor walking
* through the leaf pages, that has the previous page read-locked and
* is waiting on a lock for the page we just split. It will deadlock
* here. If this is a problem, we can fail in the split; it's not a
* problem as the split will succeed after the cursor passes through
* the page we're splitting.
*/
if (TYPE(cp->page) == P_LBTREE && rp->next_pgno != PGNO_INVALID) {
if ((ret = __bam_lget(dbp,
0, rp->next_pgno, DB_LOCK_WRITE, &tplock)) != 0)
goto err;
if ((ret = __bam_pget(dbp, &tp, &rp->next_pgno, 0)) != 0)
goto err;
}
/* Insert the new pages into the parent page. */
if ((ret = __bam_pinsert(dbp, pp, lp, rp)) != 0)
goto err;
/* Log the change. */
if (DB_LOGGING(dbp)) {
DBT __a;
DB_LSN __lsn;
memset(&__a, 0, sizeof(__a));
__a.data = cp->page;
__a.size = dbp->pgsize;
if (tp == NULL)
ZERO_LSN(__lsn);
if ((ret = __bam_split_log(dbp->dbenv->lg_info, dbp->txn,
&cp->page->lsn, 0, dbp->log_fileid, PGNO(cp->page),
&LSN(cp->page), PGNO(rp), &LSN(rp), (u_int32_t)NUM_ENT(lp),
tp == NULL ? 0 : PGNO(tp),
tp == NULL ? &__lsn : &LSN(tp), &__a)) != 0)
goto err;
LSN(lp) = LSN(rp) = LSN(cp->page);
if (tp != NULL)
LSN(tp) = LSN(cp->page);
}
/* Copy the allocated page into place. */
memcpy(cp->page, lp, LOFFSET(lp));
memcpy((u_int8_t *)cp->page + HOFFSET(lp),
(u_int8_t *)lp + HOFFSET(lp), dbp->pgsize - HOFFSET(lp));
FREE(lp, dbp->pgsize);
lp = NULL;
/* Finish the next-page link. */
if (tp != NULL)
tp->prev_pgno = rp->pgno;
/* Success -- write the real pages back to the store. */
(void)memp_fput(dbp->mpf, pp->page, DB_MPOOL_DIRTY);
(void)__BT_TLPUT(dbp, pp->lock);
(void)memp_fput(dbp->mpf, cp->page, DB_MPOOL_DIRTY);
(void)__BT_TLPUT(dbp, cp->lock);
(void)memp_fput(dbp->mpf, rp, DB_MPOOL_DIRTY);
if (tp != NULL) {
(void)memp_fput(dbp->mpf, tp, DB_MPOOL_DIRTY);
(void)__BT_TLPUT(dbp, tplock);
}
return (0);
err: if (lp != NULL)
FREE(lp, dbp->pgsize);
if (rp != NULL)
(void)__bam_free(dbp, rp);
if (tp != NULL) {
(void)memp_fput(dbp->mpf, tp, 0);
(void)__BT_TLPUT(dbp, tplock);
}
(void)memp_fput(dbp->mpf, pp->page, 0);
(void)__BT_TLPUT(dbp, pp->lock);
(void)memp_fput(dbp->mpf, cp->page, 0);
(void)__BT_TLPUT(dbp, cp->lock);
return (ret);
}
/*
* __bam_broot --
* Fix up the btree root page after it has been split.
*
* PUBLIC: int __bam_broot __P((DB *, PAGE *, PAGE *, PAGE *));
*/
int
__bam_broot(dbp, rootp, lp, rp)
DB *dbp;
PAGE *rootp, *lp, *rp;
{
BINTERNAL bi, *child_bi;
BKEYDATA *child_bk;
DBT hdr, data;
int ret;
/*
* If the root page was a leaf page, change it into an internal page.
* We copy the key we split on (but not the key's data, in the case of
* a leaf page) to the new root page.
*/
P_INIT(rootp, dbp->pgsize,
PGNO_ROOT, PGNO_INVALID, PGNO_INVALID, lp->level + 1, P_IBTREE);
/*
* The btree comparison code guarantees that the left-most key on any
* level of the tree is never used, so it doesn't need to be filled in.
*/
bi.len = 0;
bi.deleted = 0;
bi.type = B_KEYDATA;
bi.pgno = lp->pgno;
if (F_ISSET(dbp, DB_BT_RECNUM)) {
bi.nrecs = __bam_total(lp);
RE_NREC_SET(rootp, bi.nrecs);
}
memset(&hdr, 0, sizeof(hdr));
hdr.data = &bi;
hdr.size = SSZA(BINTERNAL, data);
memset(&data, 0, sizeof(data));
data.data = (char *) "";
data.size = 0;
if ((ret =
__db_pitem(dbp, rootp, 0, BINTERNAL_SIZE(0), &hdr, &data)) != 0)
return (ret);
switch (TYPE(rp)) {
case P_IBTREE:
/* Copy the first key of the child page onto the root page. */
child_bi = GET_BINTERNAL(rp, 0);
bi.len = child_bi->len;
bi.deleted = 0;
bi.type = child_bi->type;
bi.pgno = rp->pgno;
if (F_ISSET(dbp, DB_BT_RECNUM)) {
bi.nrecs = __bam_total(rp);
RE_NREC_ADJ(rootp, bi.nrecs);
}
hdr.data = &bi;
hdr.size = SSZA(BINTERNAL, data);
data.data = child_bi->data;
data.size = child_bi->len;
if ((ret = __db_pitem(dbp, rootp, 1,
BINTERNAL_SIZE(child_bi->len), &hdr, &data)) != 0)
return (ret);
/* Increment the overflow ref count. */
if (child_bi->type == B_OVERFLOW && (ret =
__db_ioff(dbp, ((BOVERFLOW *)(child_bi->data))->pgno)) != 0)
return (ret);
break;
case P_LBTREE:
/* Copy the first key of the child page onto the root page. */
child_bk = GET_BKEYDATA(rp, 0);
switch (child_bk->type) {
case B_KEYDATA:
bi.len = child_bk->len;
bi.deleted = 0;
bi.type = child_bk->type;
bi.pgno = rp->pgno;
if (F_ISSET(dbp, DB_BT_RECNUM)) {
bi.nrecs = __bam_total(rp);
RE_NREC_ADJ(rootp, bi.nrecs);
}
hdr.data = &bi;
hdr.size = SSZA(BINTERNAL, data);
data.data = child_bk->data;
data.size = child_bk->len;
if ((ret = __db_pitem(dbp, rootp, 1,
BINTERNAL_SIZE(child_bk->len), &hdr, &data)) != 0)
return (ret);
break;
case B_DUPLICATE:
case B_OVERFLOW:
bi.len = BOVERFLOW_SIZE;
bi.deleted = 0;
bi.type = child_bk->type;
bi.pgno = rp->pgno;
if (F_ISSET(dbp, DB_BT_RECNUM)) {
bi.nrecs = __bam_total(rp);
RE_NREC_ADJ(rootp, bi.nrecs);
}
hdr.data = &bi;
hdr.size = SSZA(BINTERNAL, data);
data.data = child_bk;
data.size = BOVERFLOW_SIZE;
if ((ret = __db_pitem(dbp, rootp, 1,
BINTERNAL_SIZE(BOVERFLOW_SIZE), &hdr, &data)) != 0)
return (ret);
/* Increment the overflow ref count. */
if (child_bk->type == B_OVERFLOW && (ret =
__db_ioff(dbp, ((BOVERFLOW *)child_bk)->pgno)) != 0)
return (ret);
break;
default:
return (__db_pgfmt(dbp, rp->pgno));
}
break;
default:
return (__db_pgfmt(dbp, rp->pgno));
}
return (0);
}
/*
* __ram_root --
* Fix up the recno root page after it has been split.
*
* PUBLIC: int __ram_root __P((DB *, PAGE *, PAGE *, PAGE *));
*/
int
__ram_root(dbp, rootp, lp, rp)
DB *dbp;
PAGE *rootp, *lp, *rp;
{
DBT hdr;
RINTERNAL ri;
int ret;
/* Initialize the page. */
P_INIT(rootp, dbp->pgsize,
PGNO_ROOT, PGNO_INVALID, PGNO_INVALID, lp->level + 1, P_IRECNO);
/* Initialize the header. */
memset(&hdr, 0, sizeof(hdr));
hdr.data = &ri;
hdr.size = RINTERNAL_SIZE;
/* Insert the left and right keys, set the header information. */
ri.pgno = lp->pgno;
ri.nrecs = __bam_total(lp);
if ((ret = __db_pitem(dbp, rootp, 0, RINTERNAL_SIZE, &hdr, NULL)) != 0)
return (ret);
RE_NREC_SET(rootp, ri.nrecs);
ri.pgno = rp->pgno;
ri.nrecs = __bam_total(rp);
if ((ret = __db_pitem(dbp, rootp, 1, RINTERNAL_SIZE, &hdr, NULL)) != 0)
return (ret);
RE_NREC_ADJ(rootp, ri.nrecs);
return (0);
}
/*
* __bam_pinsert --
* Insert a new key into a parent page, completing the split.
*/
static int
__bam_pinsert(dbp, parent, lchild, rchild)
DB *dbp;
EPG *parent;
PAGE *lchild, *rchild;
{
BINTERNAL bi, *child_bi;
BKEYDATA *child_bk, *tmp_bk;
BTREE *t;
DBT a, b, hdr, data;
PAGE *ppage;
RINTERNAL ri;
db_indx_t off;
db_recno_t nrecs;
u_int32_t n, nbytes, nksize;
int ret;
t = dbp->internal;
ppage = parent->page;
/* If handling record numbers, count records split to the right page. */
nrecs = dbp->type == DB_RECNO || F_ISSET(dbp, DB_BT_RECNUM) ?
__bam_total(rchild) : 0;
/*
* Now we insert the new page's first key into the parent page, which
* completes the split. The parent points to a PAGE and a page index
* offset, where the new key goes ONE AFTER the index, because we split
* to the right.
*
* XXX
* Some btree algorithms replace the key for the old page as well as
* the new page. We don't, as there's no reason to believe that the
* first key on the old page is any better than the key we have, and,
* in the case of a key being placed at index 0 causing the split, the
* key is unavailable.
*/
off = parent->indx + O_INDX;
/*
* Calculate the space needed on the parent page.
*
* Prefix trees: space hack used when inserting into BINTERNAL pages.
* Retain only what's needed to distinguish between the new entry and
* the LAST entry on the page to its left. If the keys compare equal,
* retain the entire key. We ignore overflow keys, and the entire key
* must be retained for the next-to-leftmost key on the leftmost page
* of each level, or the search will fail. Applicable ONLY to internal
* pages that have leaf pages as children. Further reduction of the
* key between pairs of internal pages loses too much information.
*/
switch (TYPE(rchild)) {
case P_IBTREE:
child_bi = GET_BINTERNAL(rchild, 0);
nbytes = BINTERNAL_PSIZE(child_bi->len);
if (P_FREESPACE(ppage) < nbytes)
return (DB_NEEDSPLIT);
/* Add a new record for the right page. */
bi.len = child_bi->len;
bi.deleted = 0;
bi.type = child_bi->type;
bi.pgno = rchild->pgno;
bi.nrecs = nrecs;
memset(&hdr, 0, sizeof(hdr));
hdr.data = &bi;
hdr.size = SSZA(BINTERNAL, data);
memset(&data, 0, sizeof(data));
data.data = child_bi->data;
data.size = child_bi->len;
if ((ret = __db_pitem(dbp, ppage, off,
BINTERNAL_SIZE(child_bi->len), &hdr, &data)) != 0)
return (ret);
/* Increment the overflow ref count. */
if (child_bi->type == B_OVERFLOW && (ret =
__db_ioff(dbp, ((BOVERFLOW *)(child_bi->data))->pgno)) != 0)
return (ret);
break;
case P_LBTREE:
child_bk = GET_BKEYDATA(rchild, 0);
switch (child_bk->type) {
case B_KEYDATA:
nbytes = BINTERNAL_PSIZE(child_bk->len);
nksize = child_bk->len;
if (t->bt_prefix == NULL)
goto noprefix;
if (ppage->prev_pgno == PGNO_INVALID && off <= 1)
goto noprefix;
tmp_bk = GET_BKEYDATA(lchild, NUM_ENT(lchild) - P_INDX);
if (tmp_bk->type != B_KEYDATA)
goto noprefix;
memset(&a, 0, sizeof(a));
a.size = tmp_bk->len;
a.data = tmp_bk->data;
memset(&b, 0, sizeof(b));
b.size = child_bk->len;
b.data = child_bk->data;
nksize = t->bt_prefix(&a, &b);
if ((n = BINTERNAL_PSIZE(nksize)) < nbytes) {
t->lstat.bt_pfxsaved += nbytes - n;
nbytes = n;
} else
noprefix: nksize = child_bk->len;
if (P_FREESPACE(ppage) < nbytes)
return (DB_NEEDSPLIT);
bi.len = nksize;
bi.deleted = 0;
bi.type = child_bk->type;
bi.pgno = rchild->pgno;
bi.nrecs = nrecs;
memset(&hdr, 0, sizeof(hdr));
hdr.data = &bi;
hdr.size = SSZA(BINTERNAL, data);
memset(&data, 0, sizeof(data));
data.data = child_bk->data;
data.size = nksize;
if ((ret = __db_pitem(dbp, ppage, off,
BINTERNAL_SIZE(nksize), &hdr, &data)) != 0)
return (ret);
break;
case B_DUPLICATE:
case B_OVERFLOW:
nbytes = BINTERNAL_PSIZE(BOVERFLOW_SIZE);
if (P_FREESPACE(ppage) < nbytes)
return (DB_NEEDSPLIT);
bi.len = BOVERFLOW_SIZE;
bi.deleted = 0;
bi.type = child_bk->type;
bi.pgno = rchild->pgno;
bi.nrecs = nrecs;
memset(&hdr, 0, sizeof(hdr));
hdr.data = &bi;
hdr.size = SSZA(BINTERNAL, data);
memset(&data, 0, sizeof(data));
data.data = child_bk;
data.size = BOVERFLOW_SIZE;
if ((ret = __db_pitem(dbp, ppage, off,
BINTERNAL_SIZE(BOVERFLOW_SIZE), &hdr, &data)) != 0)
return (ret);
/* Increment the overflow ref count. */
if (child_bk->type == B_OVERFLOW && (ret =
__db_ioff(dbp, ((BOVERFLOW *)child_bk)->pgno)) != 0)
return (ret);
break;
default:
return (__db_pgfmt(dbp, rchild->pgno));
}
break;
case P_IRECNO:
case P_LRECNO:
nbytes = RINTERNAL_PSIZE;
if (P_FREESPACE(ppage) < nbytes)
return (DB_NEEDSPLIT);
/* Add a new record for the right page. */
memset(&hdr, 0, sizeof(hdr));
hdr.data = &ri;
hdr.size = RINTERNAL_SIZE;
ri.pgno = rchild->pgno;
ri.nrecs = nrecs;
if ((ret = __db_pitem(dbp,
ppage, off, RINTERNAL_SIZE, &hdr, NULL)) != 0)
return (ret);
break;
default:
return (__db_pgfmt(dbp, rchild->pgno));
}
/* Adjust the parent page's left page record count. */
if (dbp->type == DB_RECNO || F_ISSET(dbp, DB_BT_RECNUM)) {
/* Log the change. */
if (DB_LOGGING(dbp) &&
(ret = __bam_cadjust_log(dbp->dbenv->lg_info,
dbp->txn, &LSN(ppage), 0, dbp->log_fileid,
PGNO(ppage), &LSN(ppage), (u_int32_t)parent->indx,
-(int32_t)nrecs, (int32_t)0)) != 0)
return (ret);
/* Update the left page count. */
if (dbp->type == DB_RECNO)
GET_RINTERNAL(ppage, parent->indx)->nrecs -= nrecs;
else
GET_BINTERNAL(ppage, parent->indx)->nrecs -= nrecs;
}
return (0);
}
/*
* __bam_psplit --
* Do the real work of splitting the page.
*/
static int
__bam_psplit(dbp, cp, lp, rp, cleft)
DB *dbp;
EPG *cp;
PAGE *lp, *rp;
int cleft;
{
BTREE *t;
PAGE *pp;
db_indx_t half, nbytes, off, splitp, top;
int adjust, cnt, isbigkey, ret;
t = dbp->internal;
pp = cp->page;
adjust = TYPE(pp) == P_LBTREE ? P_INDX : O_INDX;
/*
* If we're splitting the first (last) page on a level because we're
* inserting (appending) a key to it, it's likely that the data is
* sorted. Moving a single item to the new page is less work and can
* push the fill factor higher than normal. If we're wrong it's not
* a big deal, we'll just do the split the right way next time.
*/
off = 0;
if (NEXT_PGNO(pp) == PGNO_INVALID &&
((ISINTERNAL(pp) && cp->indx == NUM_ENT(cp->page) - 1) ||
(!ISINTERNAL(pp) && cp->indx == NUM_ENT(cp->page))))
off = NUM_ENT(cp->page) - adjust;
else if (PREV_PGNO(pp) == PGNO_INVALID && cp->indx == 0)
off = adjust;
++t->lstat.bt_split;
if (off != 0) {
++t->lstat.bt_fastsplit;
goto sort;
}
/*
* Split the data to the left and right pages. Try not to split on
* an overflow key. (Overflow keys on internal pages will slow down
* searches.) Refuse to split in the middle of a set of duplicates.
*
* First, find the optimum place to split.
*
* It's possible to try and split past the last record on the page if
* there's a very large record at the end of the page. Make sure this
* doesn't happen by bounding the check at the next-to-last entry on
* the page.
*
* Note, we try and split half the data present on the page. This is
* because another process may have already split the page and left
* it half empty. We don't try and skip the split -- we don't know
* how much space we're going to need on the page, and we may need up
* to half the page for a big item, so there's no easy test to decide
* if we need to split or not. Besides, if two threads are inserting
* data into the same place in the database, we're probably going to
* need more space soon anyway.
*/
top = NUM_ENT(pp) - adjust;
half = (dbp->pgsize - HOFFSET(pp)) / 2;
for (nbytes = 0, off = 0; off < top && nbytes < half; ++off)
switch (TYPE(pp)) {
case P_IBTREE:
if (GET_BINTERNAL(pp, off)->type == B_KEYDATA)
nbytes +=
BINTERNAL_SIZE(GET_BINTERNAL(pp, off)->len);
else
nbytes += BINTERNAL_SIZE(BOVERFLOW_SIZE);
break;
case P_LBTREE:
if (GET_BKEYDATA(pp, off)->type == B_KEYDATA)
nbytes +=
BKEYDATA_SIZE(GET_BKEYDATA(pp, off)->len);
else
nbytes += BOVERFLOW_SIZE;
++off;
if (GET_BKEYDATA(pp, off)->type == B_KEYDATA)
nbytes +=
BKEYDATA_SIZE(GET_BKEYDATA(pp, off)->len);
else
nbytes += BOVERFLOW_SIZE;
break;
case P_IRECNO:
nbytes += RINTERNAL_SIZE;
break;
case P_LRECNO:
nbytes += BKEYDATA_SIZE(GET_BKEYDATA(pp, off)->len);
break;
default:
return (__db_pgfmt(dbp, pp->pgno));
}
sort: splitp = off;
/*
* Splitp is either at or just past the optimum split point. If
* it's a big key, try and find something close by that's not.
*/
if (TYPE(pp) == P_IBTREE)
isbigkey = GET_BINTERNAL(pp, off)->type != B_KEYDATA;
else if (TYPE(pp) == P_LBTREE)
isbigkey = GET_BKEYDATA(pp, off)->type != B_KEYDATA;
else
isbigkey = 0;
if (isbigkey)
for (cnt = 1; cnt <= 3; ++cnt) {
off = splitp + cnt * adjust;
if (off < (db_indx_t)NUM_ENT(pp) &&
((TYPE(pp) == P_IBTREE &&
GET_BINTERNAL(pp, off)->type == B_KEYDATA) ||
GET_BKEYDATA(pp, off)->type == B_KEYDATA)) {
splitp = off;
break;
}
if (splitp <= (db_indx_t)(cnt * adjust))
continue;
off = splitp - cnt * adjust;
if (TYPE(pp) == P_IBTREE ?
GET_BINTERNAL(pp, off)->type == B_KEYDATA :
GET_BKEYDATA(pp, off)->type == B_KEYDATA) {
splitp = off;
break;
}
}
/*
* We can't split in the middle a set of duplicates. We know that
* no duplicate set can take up more than about 25% of the page,
* because that's the point where we push it off onto a duplicate
* page set. So, this loop can't be unbounded.
*/
if (F_ISSET(dbp, DB_AM_DUP) && TYPE(pp) == P_LBTREE &&
pp->inp[splitp] == pp->inp[splitp - adjust])
for (cnt = 1;; ++cnt) {
off = splitp + cnt * adjust;
if (off < NUM_ENT(pp) &&
pp->inp[splitp] != pp->inp[off]) {
splitp = off;
break;
}
if (splitp <= (db_indx_t)(cnt * adjust))
continue;
off = splitp - cnt * adjust;
if (pp->inp[splitp] != pp->inp[off]) {
splitp = off + adjust;
break;
}
}
/* We're going to split at splitp. */
if ((ret = __bam_copy(dbp, pp, lp, 0, splitp)) != 0)
return (ret);
if ((ret = __bam_copy(dbp, pp, rp, splitp, NUM_ENT(pp))) != 0)
return (ret);
/* Adjust the cursors. */
__bam_ca_split(dbp, pp->pgno, lp->pgno, rp->pgno, splitp, cleft);
return (0);
}
/*
* __bam_copy --
* Copy a set of records from one page to another.
*
* PUBLIC: int __bam_copy __P((DB *, PAGE *, PAGE *, u_int32_t, u_int32_t));
*/
int
__bam_copy(dbp, pp, cp, nxt, stop)
DB *dbp;
PAGE *pp, *cp;
u_int32_t nxt, stop;
{
db_indx_t dup, nbytes, off;
/*
* Copy the rest of the data to the right page. Nxt is the next
* offset placed on the target page.
*/
for (dup = off = 0; nxt < stop; ++nxt, ++NUM_ENT(cp), ++off) {
switch (TYPE(pp)) {
case P_IBTREE:
if (GET_BINTERNAL(pp, nxt)->type == B_KEYDATA)
nbytes =
BINTERNAL_SIZE(GET_BINTERNAL(pp, nxt)->len);
else
nbytes = BINTERNAL_SIZE(BOVERFLOW_SIZE);
break;
case P_LBTREE:
/*
* If we're on a key and it's a duplicate, just copy
* the offset.
*/
if (off != 0 && (nxt % P_INDX) == 0 &&
pp->inp[nxt] == pp->inp[nxt - P_INDX]) {
cp->inp[off] = cp->inp[off - P_INDX];
continue;
}
/* FALLTHROUGH */
case P_LRECNO:
if (GET_BKEYDATA(pp, nxt)->type == B_KEYDATA)
nbytes =
BKEYDATA_SIZE(GET_BKEYDATA(pp, nxt)->len);
else
nbytes = BOVERFLOW_SIZE;
break;
case P_IRECNO:
nbytes = RINTERNAL_SIZE;
break;
default:
return (__db_pgfmt(dbp, pp->pgno));
}
cp->inp[off] = HOFFSET(cp) -= nbytes;
memcpy(P_ENTRY(cp, off), P_ENTRY(pp, nxt), nbytes);
}
return (0);
}

257
db2/btree/bt_stat.c Normal file
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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)bt_stat.c 10.11 (Sleepycat) 8/19/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "btree.h"
static void __bam_add_rstat __P((DB_BTREE_LSTAT *, DB_BTREE_STAT *));
/*
* __bam_stat --
* Gather/print the btree statistics
*
* PUBLIC: int __bam_stat __P((DB *, void *, void *(*)(size_t), int));
*/
int
__bam_stat(argdbp, spp, db_malloc, flags)
DB *argdbp;
void *spp;
void *(*db_malloc) __P((size_t));
int flags;
{
BTMETA *meta;
BTREE *t;
DB *dbp;
DB_BTREE_STAT *sp;
DB_LOCK lock;
PAGE *h;
db_pgno_t lastpgno, pgno;
int ret;
DEBUG_LWRITE(argdbp, NULL, "bam_stat", NULL, NULL, flags);
/* Check for invalid flags. */
if ((ret = __db_statchk(argdbp, flags)) != 0)
return (ret);
if (spp == NULL)
return (0);
GETHANDLE(argdbp, NULL, &dbp, ret);
t = dbp->internal;
/* Allocate and clear the structure. */
if ((sp = db_malloc == NULL ?
(DB_BTREE_STAT *)malloc(sizeof(*sp)) :
(DB_BTREE_STAT *)db_malloc(sizeof(*sp))) == NULL) {
ret = ENOMEM;
goto err;
}
memset(sp, 0, sizeof(*sp));
/* If the app just wants the record count, make it fast. */
if (LF_ISSET(DB_RECORDCOUNT)) {
pgno = PGNO_ROOT;
if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_READ, &lock)) != 0)
goto err;
if ((ret = __bam_pget(dbp, (PAGE **)&h, &pgno, 0)) != 0)
goto err;
sp->bt_nrecs = RE_NREC(h);
(void)memp_fput(dbp->mpf, h, 0);
(void)__BT_LPUT(dbp, lock);
goto done;
}
/* Get the meta-data page. */
pgno = PGNO_METADATA;
if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_READ, &lock)) != 0)
goto err;
if ((ret = __bam_pget(dbp, (PAGE **)&meta, &pgno, 0)) != 0)
goto err;
/* Translate the metadata flags. */
if (F_ISSET(meta, BTM_DUP))
sp->bt_flags |= DB_DUP;
if (F_ISSET(meta, BTM_FIXEDLEN))
sp->bt_flags |= DB_FIXEDLEN;
if (F_ISSET(meta, BTM_RECNUM))
sp->bt_flags |= DB_RECNUM;
if (F_ISSET(meta, BTM_RENUMBER))
sp->bt_flags |= DB_RENUMBER;
/*
* Get the maxkey, minkey, re_len and re_pad fields from the
* metadata.
*/
sp->bt_minkey = meta->minkey;
sp->bt_maxkey = meta->maxkey;
sp->bt_re_len = meta->re_len;
sp->bt_re_pad = meta->re_pad;
/* Get the page size from the DB. */
sp->bt_pagesize = dbp->pgsize;
/* Initialize counters with the meta-data page information. */
__bam_add_rstat(&meta->stat, sp);
/*
* Add in the local information from this handle.
*
* !!!
* This is a bit odd, but it gets us closer to the truth.
*/
__bam_add_rstat(&t->lstat, sp);
/* Walk the free list, counting pages. */
for (sp->bt_free = 0, pgno = meta->free; pgno != PGNO_INVALID;) {
++sp->bt_free;
if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0) {
(void)memp_fput(dbp->mpf, meta, 0);
(void)__BT_TLPUT(dbp, lock);
goto err;
}
pgno = h->next_pgno;
(void)memp_fput(dbp->mpf, h, 0);
}
/* Discard the meta-data page. */
(void)memp_fput(dbp->mpf, meta, 0);
(void)__BT_TLPUT(dbp, lock);
/* Get the root page. */
pgno = PGNO_ROOT;
if ((ret = __bam_lget(dbp, 0, PGNO_ROOT, DB_LOCK_READ, &lock)) != 0)
goto err;
if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0) {
(void)__BT_LPUT(dbp, lock);
goto err;
}
/* Get the levels from the root page. */
sp->bt_levels = h->level;
/*
* Determine the last page of the database, then walk it, counting
* things.
*/
if ((ret = memp_fget(dbp->mpf, &lastpgno, DB_MPOOL_LAST, &h)) != 0)
goto err;
(void)memp_fput(dbp->mpf, h, 0);
for (;;) {
switch (TYPE(h)) {
case P_INVALID:
break;
case P_IBTREE:
case P_IRECNO:
++sp->bt_int_pg;
sp->bt_int_pgfree += HOFFSET(h) - LOFFSET(h);
break;
case P_LBTREE:
++sp->bt_leaf_pg;
sp->bt_leaf_pgfree += HOFFSET(h) - LOFFSET(h);
sp->bt_nrecs += NUM_ENT(h) / P_INDX;
break;
case P_LRECNO:
++sp->bt_leaf_pg;
sp->bt_leaf_pgfree += HOFFSET(h) - LOFFSET(h);
sp->bt_nrecs += NUM_ENT(h);
break;
case P_DUPLICATE:
++sp->bt_dup_pg;
/* XXX MARGO: sp->bt_dup_pgfree; */
break;
case P_OVERFLOW:
++sp->bt_over_pg;
/* XXX MARGO: sp->bt_over_pgfree; */
break;
default:
(void)memp_fput(dbp->mpf, h, 0);
(void)__BT_LPUT(dbp, lock);
return (__db_pgfmt(dbp, pgno));
}
(void)memp_fput(dbp->mpf, h, 0);
(void)__BT_LPUT(dbp, lock);
if (++pgno > lastpgno)
break;
if (__bam_lget(dbp, 0, pgno, DB_LOCK_READ, &lock))
break;
if (memp_fget(dbp->mpf, &pgno, 0, &h) != 0) {
(void)__BT_LPUT(dbp, lock);
break;
}
}
done: *(DB_BTREE_STAT **)spp = sp;
ret = 0;
err: PUTHANDLE(dbp);
return (ret);
}
/*
* __bam_add_mstat --
* Add the local statistics to the meta-data page statistics.
*
* PUBLIC: void __bam_add_mstat __P((DB_BTREE_LSTAT *, DB_BTREE_LSTAT *));
*/
void
__bam_add_mstat(from, to)
DB_BTREE_LSTAT *from;
DB_BTREE_LSTAT *to;
{
to->bt_freed += from->bt_freed;
to->bt_pfxsaved += from->bt_pfxsaved;
to->bt_split += from->bt_split;
to->bt_rootsplit += from->bt_rootsplit;
to->bt_fastsplit += from->bt_fastsplit;
to->bt_added += from->bt_added;
to->bt_deleted += from->bt_deleted;
to->bt_get += from->bt_get;
to->bt_cache_hit += from->bt_cache_hit;
to->bt_cache_miss += from->bt_cache_miss;
}
/*
* __bam_add_rstat --
* Add the local statistics to the returned statistics.
*/
static void
__bam_add_rstat(from, to)
DB_BTREE_LSTAT *from;
DB_BTREE_STAT *to;
{
to->bt_freed += from->bt_freed;
to->bt_pfxsaved += from->bt_pfxsaved;
to->bt_split += from->bt_split;
to->bt_rootsplit += from->bt_rootsplit;
to->bt_fastsplit += from->bt_fastsplit;
to->bt_added += from->bt_added;
to->bt_deleted += from->bt_deleted;
to->bt_get += from->bt_get;
to->bt_cache_hit += from->bt_cache_hit;
to->bt_cache_miss += from->bt_cache_miss;
}

137
db2/btree/btree.src Normal file
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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)btree.src 10.3 (Sleepycat) 8/17/97";
#endif /* not lint */
PREFIX bam
/*
* BTREE-pg_alloc: used to record allocating a new page.
*
* meta_lsn: the meta-data page's original lsn.
* page_lsn: the allocated page's original lsn.
* pgno: the page allocated.
* next: the next page on the free list.
*/
BEGIN pg_alloc
ARG fileid u_int32_t lu
POINTER meta_lsn DB_LSN * lu
POINTER page_lsn DB_LSN * lu
ARG pgno db_pgno_t lu
ARG ptype u_int32_t lu
ARG next db_pgno_t lu
END
/*
* BTREE-pg_free: used to record freeing a page.
*
* pgno: the page being freed.
* meta_lsn: the meta-data page's original lsn.
* header: the header from the free'd page.
* next: the previous next pointer on the metadata page.
*/
BEGIN pg_free
ARG fileid u_int32_t lu
ARG pgno db_pgno_t lu
POINTER meta_lsn DB_LSN * lu
DBT header DBT s
ARG next db_pgno_t lu
END
/*
* BTREE-split: used to log a page split.
*
* left: the page number for the low-order contents.
* llsn: the left page's original LSN.
* right: the page number for the high-order contents.
* rlsn: the right page's original LSN.
* indx: the number of entries that went to the left page.
* npgno: the next page number
* nlsn: the next page's original LSN (or 0 if no next page).
* pg: the split page's contents before the split.
*/
BEGIN split
ARG fileid u_int32_t lu
ARG left db_pgno_t lu
POINTER llsn DB_LSN * lu
ARG right db_pgno_t lu
POINTER rlsn DB_LSN * lu
ARG indx u_int32_t lu
ARG npgno db_pgno_t lu
POINTER nlsn DB_LSN * lu
DBT pg DBT s
END
/*
* BTREE-rsplit: used to log a reverse-split
*
* pgno: the page number of the page copied over the root.
* pgdbt: the page being copied on the root page.
* rootent: last entry on the root page.
* rootlsn: the root page's original lsn.
*/
BEGIN rsplit
ARG fileid u_int32_t lu
ARG pgno db_pgno_t lu
DBT pgdbt DBT s
DBT rootent DBT s
POINTER rootlsn DB_LSN * lu
END
/*
* BTREE-adj: used to log the adjustment of an index.
*
* pgno: the page modified.
* lsn: the page's original lsn.
* indx: the index adjusted.
* indx_copy: the index to copy if inserting.
* is_insert: 0 if a delete, 1 if an insert.
*/
BEGIN adj
ARG fileid u_int32_t lu
ARG pgno db_pgno_t lu
POINTER lsn DB_LSN * lu
ARG indx u_int32_t lu
ARG indx_copy u_int32_t lu
ARG is_insert u_int32_t lu
END
/*
* BTREE-cadjust: used to adjust the count change in an internal page.
*
* pgno: the page modified.
* lsn: the page's original lsn.
* indx: the index to be adjusted.
* adjust: the signed adjustment.
* total: if the total tree entries count should be adjusted
*/
BEGIN cadjust
ARG fileid u_int32_t lu
ARG pgno db_pgno_t lu
POINTER lsn DB_LSN * lu
ARG indx u_int32_t lu
ARG adjust int32_t ld
ARG total int32_t ld
END
/*
* BTREE-cdel: used to log the intent-to-delete of a cursor record.
*
* pgno: the page modified.
* lsn: the page's original lsn.
* indx: the index to be deleted.
*/
BEGIN cdel
ARG fileid u_int32_t lu
ARG pgno db_pgno_t lu
POINTER lsn DB_LSN * lu
ARG indx u_int32_t lu
END

1279
db2/btree/btree_auto.c Normal file
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