glibc/db2/db/db_dup.c
Ulrich Drepper cc3fa75512 Update.
1997-11-11 21:30  Ulrich Drepper  <drepper@cygnus.com>

	* include/sys/stat.h: Define stat, fstat, lstat and *64 variants
	as macros so the the library compiles correctly even without
	optimization.
	* io/fstat.c: Undef fstat.
	* io/fstat64.c: Undef fstat64
	* io/lstat.c: Undef lstat.
	* io/lstat64.c: Undef lstat64
	* io/stat.c: Undef stat.
	* io/stat64.c: Undef stat64
	* io/fts.c: Include <include/sys/stat.h> to get macro definitions.
	* io/ftw.c: Likewise.
	* io/getdirname.c: Likewise.

	* Makefile (install): Run test-installation.pl if possible.

	* db2/Makefile: Update from db-2.3.12.
	* db2/db.h: Likewise.
	* db2/db_int.h: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.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/btree/btree_auto.c: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.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/btree/btree_auto.c: Likewise.
	* db2/common/db_appinit.c: Likewise.
	* db2/common/db_apprec.c: Likewise.
	* db2/common/db_byteorder.c: Likewise.
	* db2/common/db_region.c: Likewise.
	* db2/db/db.c: Likewise
	* db2/db/db.src: Likewise
	* db2/db/db_auto.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/db185/db185.c: Likewise.
	* db2/hash/hash.c: Likewise.
	* db2/hash/hash.src: Likewise.
	* db2/hash/hash_auto.c: Likewise.
	* db2/hash/hash_dup.c: Likewise.
	* db2/hash/hash_page.c: Likewise.
	* db2/hash/hash_rec.c: Likewise.
	* db2/include/btree_auto.h: Likewise.
	* db2/include/btree_ext.h: Likewise.
	* db2/include/clib_ext.h: Likewise.
	* db2/include/common_ext.h: Likewise.
	* db2/include/db.h.src: Likewise.
	* db2/include/db_am.h: Likewise.
	* db2/include/db_auto.h: Likewise.
	* db2/include/db_cxx.h: Likewise.
	* db2/include/db_ext.h: Likewise.
	* db2/include/db_int.h.src: Likewise.
	* db2/include/hash.h: Likewise.
	* db2/include/hash_auto.h: Likewise.
	* db2/include/hash_ext.h: Likewise.
	* db2/include/lock.h: Likewise.
	* db2/include/lock_ext.h: Likewise.
	* db2/include/log.h: Likewise.
	* db2/include/log_ext.h: Likewise.
	* db2/include/mp.h: Likewise.
	* db2/include/mp_ext.h: Likewise.
	* db2/include/mutex_ext.h: Likewise.
	* db2/include/os_ext.h: Likewise.
	* db2/include/os_func.h: Likewise.
	* db2/include/txn.h: Likewise.
	* db2/include/txn_ext.h: Likewise.
	* db2/lock/lock.c: Likewise.
	* db2/lock/lock_deadlock.c: Likewise.
	* db2/log/log.c: Likewise.
	* db2/log/log_archive.c: Likewise.
	* db2/log/log_auto.c: Likewise.
	* db2/log/log_findckp.c: Likewise.
	* db2/log/log_get.c: Likewise.
	* db2/log/log_put.c: Likewise.
	* db2/log/log_rec.c: Likewise.
	* db2/log/log_register.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_pr.c: Likewise.
	* db2/mp/mp_region.c: Likewise.
	* db2/mp/mp_sync.c: Likewise.
	* db2/mutex/mutex.c: Likewise.
	* db2/os/os_abs.c: Likewise.
	* db2/os/os_dir.c: Likewise.
	* db2/os/os_fid.c: Likewise.
	* db2/os/os_fsync.c: Likewise.
	* db2/os/os_func.c: Likewise.
	* db2/os/os_map.c: Likewise.
	* db2/os/os_oflags.c: Likewise.
	* db2/os/os_open.c: Likewise.
	* db2/os/os_rpath.c: Likewise.
	* db2/os/os_rw.c: Likewise.
	* db2/os/os_seek.c: Likewise.
	* db2/os/os_sleep.c: Likewise.
	* db2/os/os_stat.c: Likewise.
	* db2/os/os_unlink.c: Likewise.
	* db2/progs/db_deadlock/db_deadlock.c: Likewise.
	* db2/progs/db_dump/db_dump.c: Likewise.
	* db2/progs/db_load/db_load.c: Likewise.
	* db2/progs/db_recover/db_recover.c: Likewise.
	* db2/progs/db_stat/db_stat.c: Likewise.
	* db2/txn/txn.c: Likewise.
	* db2/txn/txn_auto.c: Likewise.
	* db2/txn/txn_rec.c: Likewise.
	* db2/os/db_os_abs.c: Removed.
	* db2/os/db_os_dir.c: Removed.
	* db2/os/db_os_fid.c: Removed.
	* db2/os/db_os_lseek.c: Removed.
	* db2/os/db_os_mmap.c: Removed.
	* db2/os/db_os_open.c: Removed.
	* db2/os/db_os_rw.c: Removed.
	* db2/os/db_os_sleep.c: Removed.
	* db2/os/db_os_stat.c: Removed.
	* db2/os/db_os_unlink.c: Removed.

	* libio/stdio.h (fopen): Add __restrict to parameters.

	* manual/process.texi (system): Describe behaviour for NULL argument.

	* stdio-common/printf-parse.h: Parse hh modifier.
	* stdio-common/vfprintf.c: Handle hh modifier.
	* stdio-common/vfscanf.c: Likewise.
	* manual/stdio.texi: Describe hh modifier for scanf/printf.

	* math/complex.h: Don't define _Imaginary_I, but instead _Complex_I.
	gcc does no yet know the `imaginary' keyword.

	* math/test-math.c: Add little test for know gcc bug.

	* math/tgmath.h: Make complex versions of log10() only available
	if __USE_GNU.

	* stdlib/test-canon.c: Fix typo.

	* sysdeps/generic/setenv.c: Avoid compilation warnings.
	Reported by Jim Meyering.

	* sysdeps/generic/bits/errno.h: EILSEQ is an ISO C error number.
	* sysdeps/mach/hurd/bits/errno.h: Likewise.
	* sysdeps/standalone/bits/errno.h: Likewise.
	* sysdeps/unix/sysv/linux/bits/errno.h: Likewise.

	* sysdeps/i386/i586/memcpy.S: New file.
	* sysdeps/i386/i586/mempcpy.S: New file.

	* sysdeps/i386/i586/memset.S: Fix typo.

	* sysdeps/posix/getcwd.c: Define HAVE_MEMPCPY for _LIBC.  Add casts.

	* sysdeps/posix/system.c: Add comment to explain code.

	* sysdeps/wordsize-32/inttypes.h: Include <stddef.h> for wchar_t.
	Define PTRDIFF_{MIN,MAX}, SIG_ATOMIC_{MIN,MAX}, SIZE_MAX,
	WCHAR_{MIN,MAX}, WINT_{MIN,MAX}.
	Define wcstoimax, wcstoumax.
	* sysdeps/wordsize-64/inttypes.h: Likewise.

	* wcsmbs/wchar.h: Define WCHAR_{MIN,MAX} if not already defined.
	Declare __wcsto{l,ul,ll,ull}_internal only if not already done.

	* time/Makefile (routines): Add strfxtime.
	* time/strftime.c: Implement %F and %f format.
	* time/strfxtime.c: New file.
	* time/time.h: Define new types and symbols from ISO C 9X.

	* time/mktime.c: Little comment correction.

1997-11-10  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/libm-ieee754/s_sincosl.c: Fix typo.

	* sysdeps/libm-ieee754/s_tanl.c: Fix typo.

	* sysdeps/libm-ieee754/s_floorl.c: Correct typos.

	* sysdeps/libm-ieee754/e_remainderl.c: Replace
	EXTRACT_LDOUBLE_WORDS by GET_LDOUBLE_WORDS.

	* sysdeps/libm-ieee754/e_atan2l.c: Replace EXTRACT_LDOUBLE_WORDS
	by GET_LDOUBLE_WORDS.

	* sysdeps/libm-ieee754/s_scalbnl.c: Replace ";" by "," for correct
	variable declaration.
	* sysdeps/libm-ieee754/s_scalblnl.c: Likewise.

	* sysdeps/libm-ieee754/s_lrint.c (__lrint): Correct function.

	* math/libm-test.c (sqrt_test): Add test for sqrt (0.25).
	(asin_test): Add more test.

1997-11-10 23:34  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/libm-ieee754/e_asin.c: Add braces to make code clearer
	and to not confuse the poor compiler.
	* sysdeps/libm-ieee754/e_asinf.c: Likewise.
	Reported by vertex@cagent.com.

1997-11-09  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* elf/dl-lookup.c (do_lookup): Don't accept the base version if we
	require a specific one.

	* libio/oldfreopen.c: Bind old symbols to version GLIBC_2.0.
	* libio/oldiofopen.c: Likewise.
	* libio/oldstdfiles.c: Likewise.
	* libc.map: Export them.

1997-11-10 07:40  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* stdlib/exit.c (exit): Handle recursive calls to exit ().

1997-11-09  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/fpu/s_llrint.c: Fixed to take double argument
	instead of long double.
	* sysdeps/m68k/fpu/s_llrintf.c: New file.
	* sysdeps/m68k/fpu/s_llrintl.c: New file.

	* sysdeps/libm-ieee754/s_llrint.c: Make compilable and fix
	overflow condition.
	* sysdeps/libm-ieee754/s_llrintf.c: Fix overflow condition.
	* sysdeps/libm-ieee754/s_llrintl.c: Likewise.
	* sysdeps/libm-ieee754/s_llround.c: Likewise.
	* sysdeps/libm-ieee754/s_llroundf.c: Likewise.
	* sysdeps/libm-ieee754/s_llroundl.c: Likewise.
	* sysdeps/libm-ieee754/s_lrint.c: Likewise.
	* sysdeps/libm-ieee754/s_lrintf.c: Likewise.
	* sysdeps/libm-ieee754/s_lrintl.c: Likewise.
	* sysdeps/libm-ieee754/s_lround.c: Likewise.
	* sysdeps/libm-ieee754/s_lroundf.c: Likewise.
	* sysdeps/libm-ieee754/s_lroundl.c: Likewise.

	* math/libm-test.c: Test all three variants of lrint and llrint.
	Fix typos in lround and llround tests.  Add tests for boundary
	cases for lrint and llround.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/arith.texi: Misc doc fixes.
	* manual/ctype.texi: Likewise.
	* manual/pattern.texi: Likewise.
	* manual/terminal.texi: Likewise.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/xstatconv.c: Use struct assignment
	instead of memcpy to let the compiler use whatever it regards as
	optimal.
	* sysdeps/unix/sysv/linux/alpha/xstatconv.c: Likewise.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/Makefile (sysdep_headers)
	[$(subdir)=misc]: Add sys/prctl.h.
	* sysdeps/unix/sysv/linux/Dist: Distribute it.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* io/ftwtest-sh: Don't use the unknown which command, instead try
	pwd as /bin/pwd and /usr/bin/pwd.

1997-11-08  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/maint.texi (Tools for Installation): Don't recommend
	broken version 3.76.1 of make.
	(Porting): Fix wording.

1997-11-06 06:13  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* config.make.in (build-pic-default): New, defined with
	pic_default.

	* configure.in (pic_default): New, set to yes if PIC is
	default.

	* Makeconfig (CPPFLAGS-.o, CPPFLAGS-.op, CPPFLAGS-.og,
	CPPFLAGS-.ob): Add -DPIC if $(build-pic-default) is yes.

1997-11-09 18:15  Ulrich Drepper  <drepper@cygnus.com>

	* Makerules (libc.so): Fix typo.

	* csu/Makefile (CFLAGS-initfini.s): Correctly fix moving function
	definition.  Patch by Zack Weinberg <zack@rabi.phys.columbia.edu>.

	* stdlib/strtod.c: Handle numbers like 0.0e10000 correctly which
	produce ±0.0.  Reported by Joe Keane <jgk@jgk.org>.

	* sysdeps/libm-ieee754/s_ceill.c: Fix typos.
	* sysdeps/libm-ieee754/s_llrint.c: Correct code, it never worked.

1997-11-06 07:00  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* sysdeps/unix/sysv/i386/i686/time.S: Removed.

1997-11-08 14:07  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* nis/libnsl.map: Add __do_niscall2 for nis_cachemgr.

	* nis/nis_call.c: Set UDP resend timeout correct.

	* nis/nss_compat/compat-grp.c: Rewritten to make it faster.
	* nis/nss_compat/compat-pwd.c: Likewise.
	* nis/nss_compat/compat-spwd.c: Likewise.
	* nis/ypclnt.c: Fix UDP resend timeout, fix yp_bind/do_ypcall
	interaction.

	* inet/protocols/routed.h: Include sys/socket.h.
	* inet/protocols/talkd.h: Likewise.
	* inet/protocols/timed.h: Include rpc/types.h.
	* sunrpc/rpc/pmap_clnt.h: Include rpc/clnt.h.

1997-11-06 01:39  Ulrich Drepper  <drepper@cygnus.com>

	* Makerules (libc.so): Add missing closing brace.

1997-11-05  Brendan Kehoe  <brendan@lisa.cygnus.com>

	* libio.h (__P): Name its arg `p' instead of `params'.
	This was added solely to work around problems with
	the definition of __P in the Solaris math.h header.
1997-11-12 00:06:02 +00:00

679 lines
16 KiB
C

/*-
* 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[] = "@(#)db_dup.c 10.10 (Sleepycat) 10/25/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "db_swap.h"
#include "btree.h"
#include "db_am.h"
#include "common_ext.h"
static int __db_addpage __P((DB *,
PAGE **, db_indx_t *, int (*)(DB *, u_int32_t, PAGE **)));
static int __db_dsplit __P((DB *,
PAGE **, db_indx_t *, u_int32_t, int (*)(DB *, u_int32_t, PAGE **)));
/*
* __db_dput --
* Put a duplicate item onto a duplicate page at the given index.
*
* PUBLIC: int __db_dput __P((DB *,
* PUBLIC: DBT *, PAGE **, db_indx_t *, int (*)(DB *, u_int32_t, PAGE **)));
*/
int
__db_dput(dbp, dbt, pp, indxp, newfunc)
DB *dbp;
DBT *dbt;
PAGE **pp;
db_indx_t *indxp;
int (*newfunc) __P((DB *, u_int32_t, PAGE **));
{
BOVERFLOW bo;
DBT *data_dbtp, hdr_dbt, *hdr_dbtp;
PAGE *pagep;
db_indx_t size, isize;
db_pgno_t pgno;
int ret;
/*
* We need some access method independent threshold for when we put
* a duplicate item onto an overflow page.
*/
if (dbt->size > 0.25 * dbp->pgsize) {
if ((ret = __db_poff(dbp, dbt, &pgno, newfunc)) != 0)
return (ret);
B_TSET(bo.type, B_OVERFLOW, 0);
bo.tlen = dbt->size;
bo.pgno = pgno;
hdr_dbt.data = &bo;
hdr_dbt.size = isize = BOVERFLOW_SIZE;
hdr_dbtp = &hdr_dbt;
size = BOVERFLOW_PSIZE;
data_dbtp = NULL;
} else {
size = BKEYDATA_PSIZE(dbt->size);
isize = BKEYDATA_SIZE(dbt->size);
hdr_dbtp = NULL;
data_dbtp = dbt;
}
pagep = *pp;
if (size > P_FREESPACE(pagep)) {
if (*indxp == NUM_ENT(*pp) && NEXT_PGNO(*pp) == PGNO_INVALID)
ret = __db_addpage(dbp, pp, indxp, newfunc);
else
ret = __db_dsplit(dbp, pp, indxp, isize, newfunc);
if (ret != 0)
/* XXX: Pages not returned to free list. */
return (ret);
pagep = *pp;
}
/*
* Now, pagep references the page on which to insert and indx is the
* the location to insert.
*/
if ((ret = __db_pitem(dbp,
pagep, (u_int32_t)*indxp, isize, hdr_dbtp, data_dbtp)) != 0)
return (ret);
(void)memp_fset(dbp->mpf, pagep, DB_MPOOL_DIRTY);
return (0);
}
/*
* __db_drem --
* Remove a duplicate at the given index on the given page.
*
* PUBLIC: int __db_drem __P((DB *,
* PUBLIC: PAGE **, u_int32_t, int (*)(DB *, PAGE *)));
*/
int
__db_drem(dbp, pp, indx, freefunc)
DB *dbp;
PAGE **pp;
u_int32_t indx;
int (*freefunc) __P((DB *, PAGE *));
{
PAGE *pagep;
int ret;
pagep = *pp;
/* Check if we are freeing a big item. */
if (B_TYPE(GET_BKEYDATA(pagep, indx)->type) == B_OVERFLOW) {
if ((ret = __db_doff(dbp,
GET_BOVERFLOW(pagep, indx)->pgno, freefunc)) != 0)
return (ret);
ret = __db_ditem(dbp, pagep, indx, BOVERFLOW_SIZE);
} else
ret = __db_ditem(dbp, pagep, indx,
BKEYDATA_SIZE(GET_BKEYDATA(pagep, indx)->len));
if (ret != 0)
return (ret);
if (NUM_ENT(pagep) == 0) {
/*
* If the page is emptied, then the page is freed and the pp
* parameter is set to reference the next, locked page in the
* duplicate chain, if one exists. If there was no such page,
* then it is set to NULL.
*
* !!!
* __db_relink will set the dirty bit for us.
*/
if ((ret = __db_relink(dbp, pagep, pp, 0)) != 0)
return (ret);
if ((ret = freefunc(dbp, pagep)) != 0)
return (ret);
} else
(void)memp_fset(dbp->mpf, pagep, DB_MPOOL_DIRTY);
return (0);
}
/*
* __db_dend --
* Find the last page in a set of offpage duplicates.
*
* PUBLIC: int __db_dend __P((DB *, db_pgno_t, PAGE **));
*/
int
__db_dend(dbp, pgno, pagep)
DB *dbp;
db_pgno_t pgno;
PAGE **pagep;
{
PAGE *h;
int ret;
/*
* This implements DB_KEYLAST. The last page is returned in pp; pgno
* should be the page number of the first page of the duplicate chain.
*/
for (;;) {
if ((ret = memp_fget(dbp->mpf, &pgno, 0, &h)) != 0) {
(void)__db_pgerr(dbp, pgno);
return (ret);
}
if ((pgno = NEXT_PGNO(h)) == PGNO_INVALID)
break;
(void)memp_fput(dbp->mpf, h, 0);
}
*pagep = h;
return (0);
}
/*
* __db_dsplit --
* Split a page of duplicates, calculating the split point based
* on an element of size "size" being added at "*indxp".
* On entry hp contains a pointer to the page-pointer of the original
* page. On exit, it returns a pointer to the page containing "*indxp"
* and "indxp" has been modified to reflect the index on the new page
* where the element should be added. The function returns with
* the page on which the insert should happen, not yet put.
*/
static int
__db_dsplit(dbp, hp, indxp, size, newfunc)
DB *dbp;
PAGE **hp;
db_indx_t *indxp;
u_int32_t size;
int (*newfunc) __P((DB *, u_int32_t, PAGE **));
{
PAGE *h, *np, *tp;
BKEYDATA *bk;
DBT page_dbt;
db_indx_t indx, nindex, oindex, sum;
db_indx_t halfbytes, i, lastsum;
int did_indx, ret, s;
h = *hp;
indx = *indxp;
/* Create a temporary page to do compaction onto. */
if ((tp = (PAGE *)__db_malloc(dbp->pgsize)) == NULL)
return (ENOMEM);
#ifdef DEBUG
memset(tp, 0xff, dbp->pgsize);
#endif
/* Create new page for the split. */
if ((ret = newfunc(dbp, P_DUPLICATE, &np)) != 0) {
FREE(tp, dbp->pgsize);
return (ret);
}
P_INIT(np, dbp->pgsize, PGNO(np), PGNO(h), NEXT_PGNO(h), 0,
P_DUPLICATE);
P_INIT(tp, dbp->pgsize, PGNO(h), PREV_PGNO(h), PGNO(np), 0,
P_DUPLICATE);
/* Figure out the split point */
halfbytes = (dbp->pgsize - HOFFSET(h)) / 2;
did_indx = 0;
for (sum = 0, lastsum = 0, i = 0; i < NUM_ENT(h); i++) {
if (i == indx) {
sum += size;
if (lastsum < halfbytes && sum >= halfbytes) {
/* We've crossed the halfway point. */
if ((db_indx_t)(halfbytes - lastsum) <
(db_indx_t)(sum - halfbytes)) {
*hp = np;
*indxp = 0;
i--;
} else
*indxp = i;
break;
}
*indxp = i;
lastsum = sum;
did_indx = 1;
}
if (B_TYPE(GET_BKEYDATA(h, i)->type) == B_KEYDATA)
sum += BKEYDATA_SIZE(GET_BKEYDATA(h, i)->len);
else
sum += BOVERFLOW_SIZE;
if (lastsum < halfbytes && sum >= halfbytes) {
/* We've crossed the halfway point. */
if ((db_indx_t)(halfbytes - lastsum) <
(db_indx_t)(sum - halfbytes))
i--;
break;
}
}
/*
* Check if we have set the return values of the index pointer and
* page pointer.
*/
if (!did_indx) {
*hp = np;
*indxp = indx - i - 1;
}
if (DB_LOGGING(dbp)) {
page_dbt.size = dbp->pgsize;
page_dbt.data = h;
if ((ret = __db_split_log(dbp->dbenv->lg_info,
dbp->txn, &LSN(h), 0, DB_SPLITOLD, dbp->log_fileid,
PGNO(h), &page_dbt, &LSN(h))) != 0) {
FREE(tp, dbp->pgsize);
return (ret);
}
LSN(tp) = LSN(h);
}
/*
* If it's a btree, adjust the cursors.
*
* i is the index of the last element to stay on the page.
*/
if (dbp->type == DB_BTREE || dbp->type == DB_RECNO)
__bam_ca_split(dbp, PGNO(h), PGNO(h), PGNO(np), i + 1, 0);
for (nindex = 0, oindex = i + 1; oindex < NUM_ENT(h); oindex++) {
bk = GET_BKEYDATA(h, oindex);
if (B_TYPE(bk->type) == B_KEYDATA)
s = BKEYDATA_SIZE(bk->len);
else
s = BOVERFLOW_SIZE;
np->inp[nindex++] = HOFFSET(np) -= s;
memcpy((u_int8_t *)np + HOFFSET(np), bk, s);
NUM_ENT(np)++;
}
/*
* Now do data compaction by copying the remaining stuff onto the
* temporary page and then copying it back to the real page.
*/
for (nindex = 0, oindex = 0; oindex <= i; oindex++) {
bk = GET_BKEYDATA(h, oindex);
if (B_TYPE(bk->type) == B_KEYDATA)
s = BKEYDATA_SIZE(bk->len);
else
s = BOVERFLOW_SIZE;
tp->inp[nindex++] = HOFFSET(tp) -= s;
memcpy((u_int8_t *)tp + HOFFSET(tp), bk, s);
NUM_ENT(tp)++;
}
/*
* This page (the temporary) should be only half full, so we do two
* memcpy's, one for the top of the page and one for the bottom of
* the page. This way we avoid copying the middle which should be
* about half a page.
*/
memcpy(h, tp, LOFFSET(tp));
memcpy((u_int8_t *)h + HOFFSET(tp),
(u_int8_t *)tp + HOFFSET(tp), dbp->pgsize - HOFFSET(tp));
FREE(tp, dbp->pgsize);
if (DB_LOGGING(dbp)) {
page_dbt.size = dbp->pgsize;
page_dbt.data = h;
if ((ret = __db_split_log(dbp->dbenv->lg_info,
dbp->txn, &LSN(h), 0, DB_SPLITNEW, dbp->log_fileid,
PGNO(h), &page_dbt, &LSN(h))) != 0)
return (ret);
page_dbt.size = dbp->pgsize;
page_dbt.data = np;
if ((ret = __db_split_log(dbp->dbenv->lg_info,
dbp->txn, &LSN(np), 0, DB_SPLITNEW, dbp->log_fileid,
PGNO(np), &page_dbt, &LSN(np))) != 0)
return (ret);
}
/*
* Figure out if the location we're interested in is on the new
* page, and if so, reset the callers' pointer. Push the other
* page back to the store.
*/
if (*hp == h)
ret = memp_fput(dbp->mpf, np, DB_MPOOL_DIRTY);
else
ret = memp_fput(dbp->mpf, h, DB_MPOOL_DIRTY);
return (ret);
}
/*
* __db_ditem --
* Remove an item from a page.
*
* PUBLIC: int __db_ditem __P((DB *, PAGE *, int, u_int32_t));
*/
int
__db_ditem(dbp, pagep, indx, nbytes)
DB *dbp;
PAGE *pagep;
int indx;
u_int32_t nbytes;
{
DBT ldbt;
db_indx_t cnt, offset;
int ret;
u_int8_t *from;
if (DB_LOGGING(dbp)) {
ldbt.data = P_ENTRY(pagep, indx);
ldbt.size = nbytes;
if ((ret = __db_addrem_log(dbp->dbenv->lg_info, dbp->txn,
&LSN(pagep), 0, DB_REM_DUP, dbp->log_fileid, PGNO(pagep),
(u_int32_t)indx, nbytes, &ldbt, NULL, &LSN(pagep))) != 0)
return (ret);
}
/*
* If there's only a single item on the page, we don't have to
* work hard.
*/
if (NUM_ENT(pagep) == 1) {
NUM_ENT(pagep) = 0;
HOFFSET(pagep) = dbp->pgsize;
return (0);
}
/*
* Pack the remaining key/data items at the end of the page. Use
* memmove(3), the regions may overlap.
*/
from = (u_int8_t *)pagep + HOFFSET(pagep);
memmove(from + nbytes, from, pagep->inp[indx] - HOFFSET(pagep));
HOFFSET(pagep) += nbytes;
/* Adjust the indices' offsets. */
offset = pagep->inp[indx];
for (cnt = 0; cnt < NUM_ENT(pagep); ++cnt)
if (pagep->inp[cnt] < offset)
pagep->inp[cnt] += nbytes;
/* Shift the indices down. */
--NUM_ENT(pagep);
if (indx != NUM_ENT(pagep))
memmove(&pagep->inp[indx], &pagep->inp[indx + 1],
sizeof(db_indx_t) * (NUM_ENT(pagep) - indx));
/* If it's a btree, adjust the cursors. */
if (dbp->type == DB_BTREE || dbp->type == DB_RECNO)
__bam_ca_di(dbp, PGNO(pagep), indx, -1);
return (0);
}
/*
* __db_pitem --
* Put an item on a page.
*
* PUBLIC: int __db_pitem
* PUBLIC: __P((DB *, PAGE *, u_int32_t, u_int32_t, DBT *, DBT *));
*/
int
__db_pitem(dbp, pagep, indx, nbytes, hdr, data)
DB *dbp;
PAGE *pagep;
u_int32_t indx;
u_int32_t nbytes;
DBT *hdr, *data;
{
BKEYDATA bk;
DBT thdr;
int ret;
u_int8_t *p;
/*
* Put a single item onto a page. The logic figuring out where to
* insert and whether it fits is handled in the caller. All we do
* here is manage the page shuffling. We cheat a little bit in that
* we don't want to copy the dbt on a normal put twice. If hdr is
* NULL, we create a BKEYDATA structure on the page, otherwise, just
* copy the caller's information onto the page.
*
* This routine is also used to put entries onto the page where the
* entry is pre-built, e.g., during recovery. In this case, the hdr
* will point to the entry, and the data argument will be NULL.
*
* !!!
* There's a tremendous potential for off-by-one errors here, since
* the passed in header sizes must be adjusted for the structure's
* placeholder for the trailing variable-length data field.
*/
if (DB_LOGGING(dbp))
if ((ret = __db_addrem_log(dbp->dbenv->lg_info, dbp->txn,
&LSN(pagep), 0, DB_ADD_DUP, dbp->log_fileid, PGNO(pagep),
(u_int32_t)indx, nbytes, hdr, data, &LSN(pagep))) != 0)
return (ret);
if (hdr == NULL) {
B_TSET(bk.type, B_KEYDATA, 0);
bk.len = data == NULL ? 0 : data->size;
thdr.data = &bk;
thdr.size = SSZA(BKEYDATA, data);
hdr = &thdr;
}
/* Adjust the index table, then put the item on the page. */
if (indx != NUM_ENT(pagep))
memmove(&pagep->inp[indx + 1], &pagep->inp[indx],
sizeof(db_indx_t) * (NUM_ENT(pagep) - indx));
HOFFSET(pagep) -= nbytes;
pagep->inp[indx] = HOFFSET(pagep);
++NUM_ENT(pagep);
p = P_ENTRY(pagep, indx);
memcpy(p, hdr->data, hdr->size);
if (data != NULL)
memcpy(p + hdr->size, data->data, data->size);
/* If it's a btree, adjust the cursors. */
if (dbp->type == DB_BTREE || dbp->type == DB_RECNO)
__bam_ca_di(dbp, PGNO(pagep), indx, 1);
return (0);
}
/*
* __db_relink --
* Relink around a deleted page.
*
* PUBLIC: int __db_relink __P((DB *, PAGE *, PAGE **, int));
*/
int
__db_relink(dbp, pagep, new_next, needlock)
DB *dbp;
PAGE *pagep, **new_next;
int needlock;
{
PAGE *np, *pp;
DB_LOCK npl, ppl;
DB_LSN *nlsnp, *plsnp;
int ret;
ret = 0;
np = pp = NULL;
npl = ppl = LOCK_INVALID;
nlsnp = plsnp = NULL;
/* Retrieve and lock the two pages. */
if (pagep->next_pgno != PGNO_INVALID) {
if (needlock && (ret = __bam_lget(dbp,
0, pagep->next_pgno, DB_LOCK_WRITE, &npl)) != 0)
goto err;
if ((ret = memp_fget(dbp->mpf,
&pagep->next_pgno, 0, &np)) != 0) {
(void)__db_pgerr(dbp, pagep->next_pgno);
goto err;
}
nlsnp = &np->lsn;
}
if (pagep->prev_pgno != PGNO_INVALID) {
if (needlock && (ret = __bam_lget(dbp,
0, pagep->prev_pgno, DB_LOCK_WRITE, &ppl)) != 0)
goto err;
if ((ret = memp_fget(dbp->mpf,
&pagep->prev_pgno, 0, &pp)) != 0) {
(void)__db_pgerr(dbp, pagep->next_pgno);
goto err;
}
plsnp = &pp->lsn;
}
/* Log the change. */
if (DB_LOGGING(dbp)) {
if ((ret = __db_relink_log(dbp->dbenv->lg_info, dbp->txn,
&pagep->lsn, 0, dbp->log_fileid, pagep->pgno, &pagep->lsn,
pagep->prev_pgno, plsnp, pagep->next_pgno, nlsnp)) != 0)
goto err;
if (np != NULL)
np->lsn = pagep->lsn;
if (pp != NULL)
pp->lsn = pagep->lsn;
}
/*
* Modify and release the two pages.
*
* !!!
* The parameter new_next gets set to the page following the page we
* are removing. If there is no following page, then new_next gets
* set to NULL.
*/
if (np != NULL) {
np->prev_pgno = pagep->prev_pgno;
if (new_next == NULL)
ret = memp_fput(dbp->mpf, np, DB_MPOOL_DIRTY);
else {
*new_next = np;
ret = memp_fset(dbp->mpf, np, DB_MPOOL_DIRTY);
}
if (ret != 0)
goto err;
if (needlock)
(void)__bam_lput(dbp, npl);
} else if (new_next != NULL)
*new_next = NULL;
if (pp != NULL) {
pp->next_pgno = pagep->next_pgno;
if ((ret = memp_fput(dbp->mpf, pp, DB_MPOOL_DIRTY)) != 0)
goto err;
if (needlock)
(void)__bam_lput(dbp, ppl);
}
return (0);
err: if (np != NULL)
(void)memp_fput(dbp->mpf, np, 0);
if (needlock && npl != LOCK_INVALID)
(void)__bam_lput(dbp, npl);
if (pp != NULL)
(void)memp_fput(dbp->mpf, pp, 0);
if (needlock && ppl != LOCK_INVALID)
(void)__bam_lput(dbp, ppl);
return (ret);
}
/*
* __db_ddup --
* Delete an offpage chain of duplicates.
*
* PUBLIC: int __db_ddup __P((DB *, db_pgno_t, int (*)(DB *, PAGE *)));
*/
int
__db_ddup(dbp, pgno, freefunc)
DB *dbp;
db_pgno_t pgno;
int (*freefunc) __P((DB *, PAGE *));
{
PAGE *pagep;
DBT tmp_dbt;
int ret;
do {
if ((ret = memp_fget(dbp->mpf, &pgno, 0, &pagep)) != 0) {
(void)__db_pgerr(dbp, pgno);
return (ret);
}
if (DB_LOGGING(dbp)) {
tmp_dbt.data = pagep;
tmp_dbt.size = dbp->pgsize;
if ((ret = __db_split_log(dbp->dbenv->lg_info, dbp->txn,
&LSN(pagep), 0, DB_SPLITOLD, dbp->log_fileid,
PGNO(pagep), &tmp_dbt, &LSN(pagep))) != 0)
return (ret);
}
pgno = pagep->next_pgno;
if ((ret = freefunc(dbp, pagep)) != 0)
return (ret);
} while (pgno != PGNO_INVALID);
return (0);
}
/*
* __db_addpage --
* Create a new page and link it onto the next_pgno field of the
* current page.
*/
static int
__db_addpage(dbp, hp, indxp, newfunc)
DB *dbp;
PAGE **hp;
db_indx_t *indxp;
int (*newfunc) __P((DB *, u_int32_t, PAGE **));
{
PAGE *newpage;
int ret;
if ((ret = newfunc(dbp, P_DUPLICATE, &newpage)) != 0)
return (ret);
if (DB_LOGGING(dbp)) {
if ((ret = __db_addpage_log(dbp->dbenv->lg_info,
dbp->txn, &LSN(*hp), 0, dbp->log_fileid,
PGNO(*hp), &LSN(*hp), PGNO(newpage), &LSN(newpage))) != 0) {
return (ret);
}
LSN(newpage) = LSN(*hp);
}
PREV_PGNO(newpage) = PGNO(*hp);
NEXT_PGNO(*hp) = PGNO(newpage);
if ((ret = memp_fput(dbp->mpf, *hp, DB_MPOOL_DIRTY)) != 0)
return (ret);
*hp = newpage;
*indxp = 0;
return (0);
}