https://origsvn.digium.com/svn/asterisk/branches/1.4 ................ r50782 | tilghman | 2007-01-13 23:13:47 -0600 (Sat, 13 Jan 2007) | 10 lines Merged revisions 50781 via svnmerge from https://origsvn.digium.com/svn/asterisk/branches/1.2 ........ r50781 | tilghman | 2007-01-13 23:01:16 -0600 (Sat, 13 Jan 2007) | 2 lines Bug 8814 - db should look for its header using a relative path, instead of the system path (Fixes FreeWRT) ........ ................ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@50783 65c4cc65-6c06-0410-ace0-fbb531ad65f3
669 lines
16 KiB
C
669 lines
16 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Margo Seltzer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)hash_bigkey.c 8.3 (Berkeley) 5/31/94";
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#endif /* LIBC_SCCS and not lint */
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/*
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* PACKAGE: hash
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* DESCRIPTION:
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* Big key/data handling for the hashing package.
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*
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* ROUTINES:
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* External
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* __big_keydata
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* __big_split
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* __big_insert
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* __big_return
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* __big_delete
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* __find_last_page
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* Internal
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* collect_key
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* collect_data
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*/
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#include <sys/param.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef DEBUG
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#include <assert.h>
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#endif
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#include "../include/db.h"
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#include "hash.h"
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#include "page.h"
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#include "extern.h"
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static int collect_key __P((HTAB *, BUFHEAD *, int, DBT *, int));
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static int collect_data __P((HTAB *, BUFHEAD *, int, int));
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/*
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* Big_insert
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*
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* You need to do an insert and the key/data pair is too big
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*
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* Returns:
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* 0 ==> OK
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*-1 ==> ERROR
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*/
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extern int
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__big_insert(hashp, bufp, key, val)
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HTAB *hashp;
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BUFHEAD *bufp;
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const DBT *key, *val;
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{
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register u_int16_t *p;
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int key_size, n, val_size;
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u_int16_t space, move_bytes, off;
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char *cp, *key_data, *val_data;
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cp = bufp->page; /* Character pointer of p. */
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p = (u_int16_t *)cp;
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key_data = (char *)key->data;
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key_size = key->size;
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val_data = (char *)val->data;
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val_size = val->size;
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/* First move the Key */
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for (space = FREESPACE(p) - BIGOVERHEAD; key_size;
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space = FREESPACE(p) - BIGOVERHEAD) {
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move_bytes = MIN(space, key_size);
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off = OFFSET(p) - move_bytes;
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memmove(cp + off, key_data, move_bytes);
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key_size -= move_bytes;
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key_data += move_bytes;
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n = p[0];
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p[++n] = off;
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p[0] = ++n;
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FREESPACE(p) = off - PAGE_META(n);
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OFFSET(p) = off;
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p[n] = PARTIAL_KEY;
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bufp = __add_ovflpage(hashp, bufp);
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if (!bufp)
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return (-1);
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n = p[0];
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if (!key_size) {
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if (FREESPACE(p)) {
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move_bytes = MIN(FREESPACE(p), val_size);
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off = OFFSET(p) - move_bytes;
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p[n] = off;
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memmove(cp + off, val_data, move_bytes);
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val_data += move_bytes;
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val_size -= move_bytes;
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p[n - 2] = FULL_KEY_DATA;
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FREESPACE(p) = FREESPACE(p) - move_bytes;
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OFFSET(p) = off;
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} else
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p[n - 2] = FULL_KEY;
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}
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p = (u_int16_t *)bufp->page;
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cp = bufp->page;
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bufp->flags |= BUF_MOD;
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}
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/* Now move the data */
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for (space = FREESPACE(p) - BIGOVERHEAD; val_size;
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space = FREESPACE(p) - BIGOVERHEAD) {
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move_bytes = MIN(space, val_size);
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/*
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* Here's the hack to make sure that if the data ends on the
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* same page as the key ends, FREESPACE is at least one.
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*/
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if ((int) space == val_size && (size_t) val_size == val->size)
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move_bytes--;
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off = OFFSET(p) - move_bytes;
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memmove(cp + off, val_data, move_bytes);
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val_size -= move_bytes;
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val_data += move_bytes;
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n = p[0];
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p[++n] = off;
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p[0] = ++n;
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FREESPACE(p) = off - PAGE_META(n);
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OFFSET(p) = off;
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if (val_size) {
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p[n] = FULL_KEY;
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bufp = __add_ovflpage(hashp, bufp);
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if (!bufp)
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return (-1);
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cp = bufp->page;
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p = (u_int16_t *)cp;
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} else
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p[n] = FULL_KEY_DATA;
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bufp->flags |= BUF_MOD;
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}
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return (0);
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}
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/*
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* Called when bufp's page contains a partial key (index should be 1)
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*
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* All pages in the big key/data pair except bufp are freed. We cannot
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* free bufp because the page pointing to it is lost and we can't get rid
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* of its pointer.
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*
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* Returns:
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* 0 => OK
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*-1 => ERROR
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*/
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extern int
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__big_delete(hashp, bufp)
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HTAB *hashp;
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BUFHEAD *bufp;
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{
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register BUFHEAD *last_bfp, *rbufp;
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u_int16_t *bp, pageno;
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int key_done, n;
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rbufp = bufp;
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last_bfp = NULL;
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bp = (u_int16_t *)bufp->page;
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pageno = 0;
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key_done = 0;
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while (!key_done || (bp[2] != FULL_KEY_DATA)) {
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if (bp[2] == FULL_KEY || bp[2] == FULL_KEY_DATA)
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key_done = 1;
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/*
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* If there is freespace left on a FULL_KEY_DATA page, then
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* the data is short and fits entirely on this page, and this
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* is the last page.
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*/
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if (bp[2] == FULL_KEY_DATA && FREESPACE(bp))
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break;
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pageno = bp[bp[0] - 1];
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rbufp->flags |= BUF_MOD;
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rbufp = __get_buf(hashp, pageno, rbufp, 0);
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if (last_bfp)
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__free_ovflpage(hashp, last_bfp);
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last_bfp = rbufp;
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if (!rbufp)
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return (-1); /* Error. */
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bp = (u_int16_t *)rbufp->page;
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}
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/*
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* If we get here then rbufp points to the last page of the big
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* key/data pair. Bufp points to the first one -- it should now be
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* empty pointing to the next page after this pair. Can't free it
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* because we don't have the page pointing to it.
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*/
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/* This is information from the last page of the pair. */
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n = bp[0];
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pageno = bp[n - 1];
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/* Now, bp is the first page of the pair. */
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bp = (u_int16_t *)bufp->page;
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if (n > 2) {
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/* There is an overflow page. */
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bp[1] = pageno;
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bp[2] = OVFLPAGE;
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bufp->ovfl = rbufp->ovfl;
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} else
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/* This is the last page. */
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bufp->ovfl = NULL;
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n -= 2;
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bp[0] = n;
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FREESPACE(bp) = hashp->BSIZE - PAGE_META(n);
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OFFSET(bp) = hashp->BSIZE - 1;
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bufp->flags |= BUF_MOD;
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if (rbufp)
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__free_ovflpage(hashp, rbufp);
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if (last_bfp && last_bfp != rbufp)
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__free_ovflpage(hashp, last_bfp);
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hashp->NKEYS--;
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return (0);
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}
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/*
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* Returns:
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* 0 = key not found
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* -1 = get next overflow page
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* -2 means key not found and this is big key/data
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* -3 error
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*/
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extern int
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__find_bigpair(hashp, bufp, ndx, key, size)
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HTAB *hashp;
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BUFHEAD *bufp;
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int ndx;
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char *key;
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int size;
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{
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register u_int16_t *bp;
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register char *p;
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int ksize;
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u_int16_t bytes;
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char *kkey;
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bp = (u_int16_t *)bufp->page;
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p = bufp->page;
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ksize = size;
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kkey = key;
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for (bytes = hashp->BSIZE - bp[ndx];
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bytes <= size && bp[ndx + 1] == PARTIAL_KEY;
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bytes = hashp->BSIZE - bp[ndx]) {
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if (memcmp(p + bp[ndx], kkey, bytes))
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return (-2);
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kkey += bytes;
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ksize -= bytes;
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bufp = __get_buf(hashp, bp[ndx + 2], bufp, 0);
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if (!bufp)
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return (-3);
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p = bufp->page;
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bp = (u_int16_t *)p;
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ndx = 1;
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}
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if (bytes != ksize || memcmp(p + bp[ndx], kkey, bytes)) {
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#ifdef HASH_STATISTICS
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++hash_collisions;
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#endif
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return (-2);
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} else
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return (ndx);
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}
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/*
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* Given the buffer pointer of the first overflow page of a big pair,
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* find the end of the big pair
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*
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* This will set bpp to the buffer header of the last page of the big pair.
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* It will return the pageno of the overflow page following the last page
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* of the pair; 0 if there isn't any (i.e. big pair is the last key in the
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* bucket)
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*/
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extern u_int16_t
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__find_last_page(hashp, bpp)
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HTAB *hashp;
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BUFHEAD **bpp;
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{
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BUFHEAD *bufp;
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u_int16_t *bp, pageno;
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int n;
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bufp = *bpp;
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bp = (u_int16_t *)bufp->page;
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for (;;) {
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n = bp[0];
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/*
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* This is the last page if: the tag is FULL_KEY_DATA and
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* either only 2 entries OVFLPAGE marker is explicit there
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* is freespace on the page.
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*/
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if (bp[2] == FULL_KEY_DATA &&
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((n == 2) || (bp[n] == OVFLPAGE) || (FREESPACE(bp))))
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break;
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pageno = bp[n - 1];
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bufp = __get_buf(hashp, pageno, bufp, 0);
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if (!bufp)
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return (0); /* Need to indicate an error! */
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bp = (u_int16_t *)bufp->page;
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}
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*bpp = bufp;
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if (bp[0] > 2)
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return (bp[3]);
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else
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return (0);
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}
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/*
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* Return the data for the key/data pair that begins on this page at this
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* index (index should always be 1).
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*/
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extern int
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__big_return(hashp, bufp, ndx, val, set_current)
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HTAB *hashp;
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BUFHEAD *bufp;
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int ndx;
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DBT *val;
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int set_current;
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{
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BUFHEAD *save_p;
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u_int16_t *bp, len, off, save_addr;
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char *tp;
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bp = (u_int16_t *)bufp->page;
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while (bp[ndx + 1] == PARTIAL_KEY) {
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bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
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if (!bufp)
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return (-1);
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bp = (u_int16_t *)bufp->page;
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ndx = 1;
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}
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if (bp[ndx + 1] == FULL_KEY) {
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bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
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if (!bufp)
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return (-1);
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bp = (u_int16_t *)bufp->page;
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save_p = bufp;
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save_addr = save_p->addr;
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off = bp[1];
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len = 0;
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} else
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if (!FREESPACE(bp)) {
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/*
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* This is a hack. We can't distinguish between
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* FULL_KEY_DATA that contains complete data or
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* incomplete data, so we require that if the data
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* is complete, there is at least 1 byte of free
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* space left.
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*/
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off = bp[bp[0]];
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len = bp[1] - off;
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save_p = bufp;
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save_addr = bufp->addr;
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bufp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
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if (!bufp)
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return (-1);
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bp = (u_int16_t *)bufp->page;
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} else {
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/* The data is all on one page. */
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tp = (char *)bp;
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off = bp[bp[0]];
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val->data = (u_char *)tp + off;
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val->size = bp[1] - off;
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if (set_current) {
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if (bp[0] == 2) { /* No more buckets in
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* chain */
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hashp->cpage = NULL;
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hashp->cbucket++;
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hashp->cndx = 1;
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} else {
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hashp->cpage = __get_buf(hashp,
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bp[bp[0] - 1], bufp, 0);
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if (!hashp->cpage)
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return (-1);
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hashp->cndx = 1;
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if (!((u_int16_t *)
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hashp->cpage->page)[0]) {
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hashp->cbucket++;
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hashp->cpage = NULL;
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}
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}
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}
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return (0);
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}
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val->size = collect_data(hashp, bufp, (int)len, set_current);
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if (val->size == (size_t) -1)
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return (-1);
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if (save_p->addr != save_addr) {
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/* We are pretty short on buffers. */
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errno = EINVAL; /* OUT OF BUFFERS */
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return (-1);
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}
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memmove(hashp->tmp_buf, (save_p->page) + off, len);
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val->data = (u_char *)hashp->tmp_buf;
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return (0);
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}
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/*
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* Count how big the total datasize is by recursing through the pages. Then
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* allocate a buffer and copy the data as you recurse up.
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*/
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static int
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collect_data(hashp, bufp, len, set)
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HTAB *hashp;
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BUFHEAD *bufp;
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int len, set;
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{
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register u_int16_t *bp;
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register char *p;
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BUFHEAD *xbp;
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u_int16_t save_addr;
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int mylen, totlen;
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p = bufp->page;
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bp = (u_int16_t *)p;
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mylen = hashp->BSIZE - bp[1];
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save_addr = bufp->addr;
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if (bp[2] == FULL_KEY_DATA) { /* End of Data */
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totlen = len + mylen;
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if (hashp->tmp_buf)
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free(hashp->tmp_buf);
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if ((hashp->tmp_buf = (char *)malloc(totlen)) == NULL)
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return (-1);
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if (set) {
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hashp->cndx = 1;
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if (bp[0] == 2) { /* No more buckets in chain */
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hashp->cpage = NULL;
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hashp->cbucket++;
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} else {
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hashp->cpage =
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__get_buf(hashp, bp[bp[0] - 1], bufp, 0);
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if (!hashp->cpage)
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return (-1);
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else if (!((u_int16_t *)hashp->cpage->page)[0]) {
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hashp->cbucket++;
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hashp->cpage = NULL;
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}
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}
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}
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} else {
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xbp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
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if (!xbp || ((totlen =
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collect_data(hashp, xbp, len + mylen, set)) < 1))
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return (-1);
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}
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if (bufp->addr != save_addr) {
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errno = EINVAL; /* Out of buffers. */
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return (-1);
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}
|
|
memmove(&hashp->tmp_buf[len], (bufp->page) + bp[1], mylen);
|
|
return (totlen);
|
|
}
|
|
|
|
/*
|
|
* Fill in the key and data for this big pair.
|
|
*/
|
|
extern int
|
|
__big_keydata(hashp, bufp, key, val, set)
|
|
HTAB *hashp;
|
|
BUFHEAD *bufp;
|
|
DBT *key, *val;
|
|
int set;
|
|
{
|
|
key->size = collect_key(hashp, bufp, 0, val, set);
|
|
if (key->size == (size_t) -1)
|
|
return (-1);
|
|
key->data = (u_char *)hashp->tmp_key;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Count how big the total key size is by recursing through the pages. Then
|
|
* collect the data, allocate a buffer and copy the key as you recurse up.
|
|
*/
|
|
static int
|
|
collect_key(hashp, bufp, len, val, set)
|
|
HTAB *hashp;
|
|
BUFHEAD *bufp;
|
|
int len;
|
|
DBT *val;
|
|
int set;
|
|
{
|
|
BUFHEAD *xbp;
|
|
char *p;
|
|
int mylen, totlen;
|
|
u_int16_t *bp, save_addr;
|
|
|
|
p = bufp->page;
|
|
bp = (u_int16_t *)p;
|
|
mylen = hashp->BSIZE - bp[1];
|
|
|
|
save_addr = bufp->addr;
|
|
totlen = len + mylen;
|
|
if (bp[2] == FULL_KEY || bp[2] == FULL_KEY_DATA) { /* End of Key. */
|
|
if (hashp->tmp_key != NULL)
|
|
free(hashp->tmp_key);
|
|
if ((hashp->tmp_key = (char *)malloc(totlen)) == NULL)
|
|
return (-1);
|
|
if (__big_return(hashp, bufp, 1, val, set))
|
|
return (-1);
|
|
} else {
|
|
xbp = __get_buf(hashp, bp[bp[0] - 1], bufp, 0);
|
|
if (!xbp || ((totlen =
|
|
collect_key(hashp, xbp, totlen, val, set)) < 1))
|
|
return (-1);
|
|
}
|
|
if (bufp->addr != save_addr) {
|
|
errno = EINVAL; /* MIS -- OUT OF BUFFERS */
|
|
return (-1);
|
|
}
|
|
memmove(&hashp->tmp_key[len], (bufp->page) + bp[1], mylen);
|
|
return (totlen);
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* 0 => OK
|
|
* -1 => error
|
|
*/
|
|
extern int
|
|
__big_split(hashp, op, np, big_keyp, addr, obucket, ret)
|
|
HTAB *hashp;
|
|
BUFHEAD *op; /* Pointer to where to put keys that go in old bucket */
|
|
BUFHEAD *np; /* Pointer to new bucket page */
|
|
/* Pointer to first page containing the big key/data */
|
|
BUFHEAD *big_keyp;
|
|
int addr; /* Address of big_keyp */
|
|
u_int32_t obucket;/* Old Bucket */
|
|
SPLIT_RETURN *ret;
|
|
{
|
|
register BUFHEAD *tmpp;
|
|
register u_int16_t *tp;
|
|
BUFHEAD *bp;
|
|
DBT key, val;
|
|
u_int32_t change;
|
|
u_int16_t free_space, n, off;
|
|
|
|
bp = big_keyp;
|
|
|
|
/* Now figure out where the big key/data goes */
|
|
if (__big_keydata(hashp, big_keyp, &key, &val, 0))
|
|
return (-1);
|
|
change = (__call_hash(hashp, key.data, key.size) != obucket);
|
|
|
|
if ((ret->next_addr = __find_last_page(hashp, &big_keyp))) {
|
|
if (!(ret->nextp =
|
|
__get_buf(hashp, ret->next_addr, big_keyp, 0)))
|
|
return (-1);;
|
|
} else
|
|
ret->nextp = NULL;
|
|
|
|
/* Now make one of np/op point to the big key/data pair */
|
|
#ifdef DEBUG
|
|
assert(np->ovfl == NULL);
|
|
#endif
|
|
if (change)
|
|
tmpp = np;
|
|
else
|
|
tmpp = op;
|
|
|
|
tmpp->flags |= BUF_MOD;
|
|
#ifdef DEBUG1
|
|
(void)fprintf(stderr,
|
|
"BIG_SPLIT: %d->ovfl was %d is now %d\n", tmpp->addr,
|
|
(tmpp->ovfl ? tmpp->ovfl->addr : 0), (bp ? bp->addr : 0));
|
|
#endif
|
|
tmpp->ovfl = bp; /* one of op/np point to big_keyp */
|
|
tp = (u_int16_t *)tmpp->page;
|
|
#ifdef DEBUG
|
|
assert(FREESPACE(tp) >= OVFLSIZE);
|
|
#endif
|
|
n = tp[0];
|
|
off = OFFSET(tp);
|
|
free_space = FREESPACE(tp);
|
|
tp[++n] = (u_int16_t)addr;
|
|
tp[++n] = OVFLPAGE;
|
|
tp[0] = n;
|
|
OFFSET(tp) = off;
|
|
FREESPACE(tp) = free_space - OVFLSIZE;
|
|
|
|
/*
|
|
* Finally, set the new and old return values. BIG_KEYP contains a
|
|
* pointer to the last page of the big key_data pair. Make sure that
|
|
* big_keyp has no following page (2 elements) or create an empty
|
|
* following page.
|
|
*/
|
|
|
|
ret->newp = np;
|
|
ret->oldp = op;
|
|
|
|
tp = (u_int16_t *)big_keyp->page;
|
|
big_keyp->flags |= BUF_MOD;
|
|
if (tp[0] > 2) {
|
|
/*
|
|
* There may be either one or two offsets on this page. If
|
|
* there is one, then the overflow page is linked on normally
|
|
* and tp[4] is OVFLPAGE. If there are two, tp[4] contains
|
|
* the second offset and needs to get stuffed in after the
|
|
* next overflow page is added.
|
|
*/
|
|
n = tp[4];
|
|
free_space = FREESPACE(tp);
|
|
off = OFFSET(tp);
|
|
tp[0] -= 2;
|
|
FREESPACE(tp) = free_space + OVFLSIZE;
|
|
OFFSET(tp) = off;
|
|
tmpp = __add_ovflpage(hashp, big_keyp);
|
|
if (!tmpp)
|
|
return (-1);
|
|
tp[4] = n;
|
|
} else
|
|
tmpp = big_keyp;
|
|
|
|
if (change)
|
|
ret->newp = tmpp;
|
|
else
|
|
ret->oldp = tmpp;
|
|
return (0);
|
|
}
|