+++ /dev/null
-/* $Id: isam.c,v 1.28 2004-01-22 11:27:21 adam Exp $
- Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004
- Index Data Aps
-
-This file is part of the Zebra server.
-
-Zebra is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
-version.
-
-Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-for more details.
-
-You should have received a copy of the GNU General Public License
-along with Zebra; see the file LICENSE.zebra. If not, write to the
-Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.
-*/
-
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-
-#include <zebrautl.h>
-#include <bfile.h>
-#include <isam.h>
-#include "isutil.h"
-#include "rootblk.h"
-#include "keyops.h"
-
-static ispt_struct *ispt_freelist = 0;
-
-static struct
-{
- int total_merge_operations;
- int total_items;
- int dub_items_removed;
- int new_items;
- int failed_deletes;
- int skipped_inserts;
- int delete_insert_noop;
- int delete_replace;
- int deletes;
- int remaps;
- int block_jumps;
- int tab_deletes;
- int new_tables;
-} statistics;
-
-static ISPT ispt_alloc()
-{
- ISPT p;
-
- if (ispt_freelist)
- {
- p = ispt_freelist;
- ispt_freelist = ispt_freelist->next;
- }
- else
- p = (ISPT) xmalloc(sizeof(ispt_struct));
- return p;
-}
-
-static void ispt_free(ISPT pt)
-{
- pt->next = ispt_freelist;
- ispt_freelist = pt;
-}
-
-static int splitargs(const char *s, char *bf[], int max)
-{
- int ct = 0;
- for (;;)
- {
- while (*s && isspace(*s))
- s++;
- bf[ct] = (char *) s;
- if (!*s)
- return ct;
- ct++;
- if (ct > max)
- {
- logf (LOG_WARN, "Ignoring extra args to is resource");
- bf[ct] = '\0';
- return(ct - 1);
- }
- while (*s && !isspace(*s))
- s++;
- }
-}
-
-/*
- * Open isam file.
- * Process resources.
- */
-ISAM is_open(BFiles bfs, const char *name,
- int (*cmp)(const void *p1, const void *p2),
- int writeflag, int keysize, Res res)
-{
- ISAM inew;
- char *nm, *pp[IS_MAX_BLOCKTYPES+1], m[2];
- int num, size, rs, tmp, i;
- const char *r;
- is_type_header th;
-
- logf (LOG_DEBUG, "is_open(%s, %s)", name, writeflag ? "RW" : "RDONLY");
- if (writeflag)
- {
- statistics.total_merge_operations = 0;
- statistics.total_items = 0;
- statistics.dub_items_removed = 0;
- statistics.new_items = 0;
- statistics.failed_deletes = 0;
- statistics.skipped_inserts = 0;
- statistics.delete_insert_noop = 0;
- statistics.delete_replace = 0;
- statistics.deletes = 0;
- statistics.remaps = 0;
- statistics.new_tables = 0;
- statistics.block_jumps = 0;
- statistics.tab_deletes = 0;
- }
-
- inew = (ISAM) xmalloc(sizeof(*inew));
- inew->writeflag = writeflag;
- for (i = 0; i < IS_MAX_BLOCKTYPES; i++)
- inew->types[i].index = 0; /* dummy */
-
- /* determine number and size of blocktypes */
- if (!(r = res_get_def(res,
- nm = strconcat(name, ".",
- "blocktypes", 0), "64 512 4K 32K")) ||
- !(num = splitargs(r, pp, IS_MAX_BLOCKTYPES)))
- {
- logf (LOG_FATAL, "Failed to locate resource %s", nm);
- return 0;
- }
- inew->num_types = num;
- for (i = 0; i < num; i++)
- {
- if ((rs = sscanf(pp[i], "%d%1[bBkKmM]", &size, m)) < 1)
- {
- logf (LOG_FATAL, "Error in resource %s: %s", r, pp[i]);
- return 0;
- }
- if (rs == 1)
- *m = 'b';
- switch (*m)
- {
- case 'b': case 'B':
- inew->types[i].blocksize = size; break;
- case 'k': case 'K':
- inew->types[i].blocksize = size * 1024; break;
- case 'm': case 'M':
- inew->types[i].blocksize = size * 1048576; break;
- default:
- logf (LOG_FATAL, "Illegal size suffix: %c", *m);
- return 0;
- }
- inew->types[i].dbuf = (char *) xmalloc(inew->types[i].blocksize);
- m[0] = 'A' + i;
- m[1] = '\0';
- if (!(inew->types[i].bf = bf_open(bfs, strconcat(name, m, 0),
- inew->types[i].blocksize, writeflag)))
- {
- logf (LOG_FATAL, "bf_open failed");
- return 0;
- }
- if ((rs = is_rb_read(&inew->types[i], &th)) > 0)
- {
- if (th.blocksize != inew->types[i].blocksize)
- {
- logf (LOG_FATAL, "File blocksize mismatch in %s", name);
- exit(1);
- }
- inew->types[i].freelist = th.freelist;
- inew->types[i].top = th.top;
- }
- else if (writeflag) /* write dummy superblock to determine top */
- {
- if ((rs = is_rb_write(&inew->types[i], &th)) <=0) /* dummy */
- {
- logf (LOG_FATAL, "Failed to write initial superblock.");
- exit(1);
- }
- inew->types[i].freelist = -1;
- inew->types[i].top = rs;
- }
- /* ELSE: this is an empty file opened in read-only mode. */
- }
- if (keysize > 0)
- inew->keysize = keysize;
- else
- {
- if (!(r = res_get_def(res, nm = strconcat(name, ".",
- "keysize", 0), "4")))
- {
- logf (LOG_FATAL, "Failed to locate resource %s", nm);
- return 0;
- }
- if ((inew->keysize = atoi(r)) <= 0)
- {
- logf (LOG_FATAL, "Must specify positive keysize.");
- return 0;
- }
- }
-
- /* determine repack percent */
- if (!(r = res_get_def(res, nm = strconcat(name, ".", "repack",
- 0), IS_DEF_REPACK_PERCENT)))
- {
- logf (LOG_FATAL, "Failed to locate resource %s", nm);
- return 0;
- }
- inew->repack = atoi(r);
-
- /* determine max keys/blocksize */
- if (!(r = res_get_def(res,
- nm = strconcat(name, ".",
- "maxkeys", 0), "50 640 10000")) ||
- !(num = splitargs(r, pp, IS_MAX_BLOCKTYPES)))
- {
- logf (LOG_FATAL, "Failed to locate resource %s", nm);
- return 0;
- }
- if (num < inew->num_types -1)
- {
- logf (LOG_FATAL, "Not enough elements in %s", nm);
- return 0;
- }
- for (i = 0; i < num; i++)
- {
- if ((rs = sscanf(pp[i], "%d", &tmp)) < 1)
- {
- logf (LOG_FATAL, "Error in resource %s: %s", r, pp[i]);
- return 0;
- }
- inew->types[i].max_keys = tmp;
- }
-
- /* determine max keys/block */
- for (i = 0; i < inew->num_types; i++)
- {
- if (!inew->types[i].index)
- {
- inew->types[i].max_keys_block = (inew->types[i].blocksize - 2 *
- sizeof(int)) / inew->keysize;
- inew->types[i].max_keys_block0 = (inew->types[i].blocksize - 3 *
- sizeof(int)) / inew->keysize;
- }
- else
- inew->types[i].max_keys_block = inew->types[i].max_keys_block0 /
- inew->keysize;
- if (inew->types[i].max_keys_block0 < 1)
- {
- logf (LOG_FATAL, "Blocksize too small in %s", name);
- exit(1);
- }
- }
-
- /* determine nice fill rates */
- if (!(r = res_get_def(res,
- nm = strconcat(name, ".",
- "nicefill", 0), "90 90 90 95")) ||
- !(num = splitargs(r, pp, IS_MAX_BLOCKTYPES)))
- {
- logf (LOG_FATAL, "Failed to locate resource %s", nm);
- return 0;
- }
- if (num < inew->num_types)
- {
- logf (LOG_FATAL, "Not enough elements in %s", nm);
- return 0;
- }
- for (i = 0; i < num; i++)
- {
- if ((rs = sscanf(pp[i], "%d", &tmp)) < 1)
- {
- logf (LOG_FATAL, "Error in resource %s: %s", r, pp[i]);
- return 0;
- }
- inew->types[i].nice_keys_block = (inew->types[i].max_keys_block0 * tmp) /
- 100;
- if (inew->types[i].nice_keys_block < 1)
- inew->types[i].nice_keys_block = 1;
- }
-
- inew->cmp = cmp ? cmp : is_default_cmp;
- return inew;
-}
-
-/*
- * Close isam file.
- */
-int is_close(ISAM is)
-{
- int i;
- is_type_header th;
-
- logf (LOG_DEBUG, "is_close()");
- for (i = 0; i < is->num_types; i++)
- {
- if (is->types[i].bf)
- {
- if (is->writeflag)
- {
- th.blocksize = is->types[i].blocksize;
- th.keysize = is->keysize;
- th.freelist = is->types[i].freelist;
- th.top = is->types[i].top;
- if (is_rb_write(&is->types[i], &th) < 0)
- {
- logf (LOG_FATAL, "Failed to write headerblock");
- exit(1);
- }
- }
- bf_close(is->types[i].bf);
- }
- }
- for (i = 0; i < is->num_types; i++)
- xfree (is->types[i].dbuf);
-
- if (is->writeflag)
- {
- logf(LOG_LOG, "ISAM statistics:");
- logf(LOG_LOG, "total_merge_operations %d",
- statistics.total_merge_operations);
- logf(LOG_LOG, "total_items %d", statistics.total_items);
- logf(LOG_LOG, "dub_items_removed %d",
- statistics.dub_items_removed);
- logf(LOG_LOG, "new_items %d", statistics.new_items);
- logf(LOG_LOG, "failed_deletes %d",
- statistics.failed_deletes);
- logf(LOG_LOG, "skipped_inserts %d",
- statistics.skipped_inserts);
- logf(LOG_LOG, "delete_insert_noop %d",
- statistics.delete_insert_noop);
- logf(LOG_LOG, "delete_replace %d",
- statistics.delete_replace);
- logf(LOG_LOG, "delete %d", statistics.deletes);
- logf(LOG_LOG, "remaps %d", statistics.remaps);
- logf(LOG_LOG, "block_jumps %d", statistics.block_jumps);
- logf(LOG_LOG, "tab_deletes %d", statistics.tab_deletes);
- }
- xfree(is);
- return 0;
-}
-
-static ISAM_P is_address(int type, int pos)
-{
- ISAM_P r;
-
- r = pos << 2;
- r |= type;
- return r;
-}
-
-ISAM_P is_merge(ISAM is, ISAM_P pos, int num, char *data)
-{
- is_mtable tab;
- int res;
- char keybuf[IS_MAX_RECORD];
- int oldnum, oldtype, i;
- char operation, *record;
-
- statistics.total_merge_operations++;
- statistics.total_items += num;
- if (!pos)
- statistics.new_tables++;
-
- is_m_establish_tab(is, &tab, pos);
- if (pos)
- if (is_m_read_full(&tab, tab.data) < 0)
- {
- logf (LOG_FATAL, "read_full failed");
- exit(1);
- }
- oldnum = tab.num_records;
- oldtype = tab.pos_type;
- while (num)
- {
- operation = *(data)++;
- record = (char*) data;
- data += is_keysize(is);
- num--;
- while (num && !memcmp(record - 1, data, is_keysize(tab.is) + 1))
- {
- data += 1 + is_keysize(is);
- num--;
- statistics.dub_items_removed++;
- }
- if ((res = is_m_seek_record(&tab, record)) > 0) /* no match */
- {
- if (operation == KEYOP_INSERT)
- {
- logf (LOG_DEBUG, "XXInserting new record.");
- is_m_write_record(&tab, record);
- statistics.new_items++;
- }
- else
- {
- logf (LOG_DEBUG, "XXDeletion failed to find match.");
- statistics.failed_deletes++;
- }
- }
- else /* match found */
- {
- if (operation == KEYOP_INSERT)
- {
- logf (LOG_DEBUG, "XXSkipping insertion - match found.");
- statistics.skipped_inserts++;
- continue;
- }
- else if (operation == KEYOP_DELETE)
- {
- /* try to avoid needlessly moving data */
- if (num && *(data) == KEYOP_INSERT)
- {
- /* next key is identical insert? - NOOP - skip it */
- if (!memcmp(record, data + 1, is_keysize(is)))
- {
- logf (LOG_DEBUG, "XXNoop delete. skipping.");
- data += 1 + is_keysize(is);
- num--;
- while (num && !memcmp(data, data + is_keysize(tab.is) +
- 1, is_keysize(tab.is) + 1))
- {
- data += 1 + is_keysize(is);
- num--;
- statistics.dub_items_removed++;
- }
- statistics.delete_insert_noop++;
- continue;
- }
- /* else check if next key can fit in this position */
- if (is_m_peek_record(&tab, keybuf) &&
- (*is->cmp)(data + 1, keybuf) < 0)
- {
- logf (LOG_DEBUG, "XXReplacing record.");
- is_m_replace_record(&tab, data + 1);
- data += 1 + is_keysize(is);
- num--;
- while (num && !memcmp(data, data + is_keysize(tab.is) +
- 1, is_keysize(tab.is) + 1))
- {
- data += 1 + is_keysize(is);
- num--;
- statistics.dub_items_removed++;
- }
- statistics.delete_replace++;
- continue;
- }
- }
- logf (LOG_DEBUG, "Deleting record.");
- is_m_delete_record(&tab);
- statistics.deletes++;
- }
- }
- }
- i = tab.pos_type;
- while (i < tab.is->num_types - 1 && tab.num_records >
- tab.is->types[i].max_keys)
- i++;
- if (i != tab.pos_type)
- {
- /* read remaining blocks */
- for (; tab.cur_mblock; tab.cur_mblock = tab.cur_mblock->next)
- if (tab.cur_mblock->state < IS_MBSTATE_CLEAN)
- is_m_read_full(&tab, tab.cur_mblock);
- is_p_unmap(&tab);
- tab.pos_type = i;
- if (pos)
- statistics.block_jumps++;
- }
- if (!oldnum || tab.pos_type != oldtype || (abs(oldnum - tab.num_records) *
- 100) / oldnum > tab.is->repack)
- {
- is_p_remap(&tab);
- statistics.remaps++;
- }
- else
- is_p_align(&tab);
- if (tab.data)
- {
- is_p_sync(&tab);
- pos = is_address(tab.pos_type, tab.data->diskpos);
- }
- else
- {
- pos = 0;
- statistics.tab_deletes++;
- }
- is_m_release_tab(&tab);
- return pos;
-}
-
-/*
- * Locate a table of keys in an isam file. The ISPT is an individual
- * position marker for that table.
- */
-ISPT is_position(ISAM is, ISAM_P pos)
-{
- ispt_struct *p;
-
- p = ispt_alloc();
- is_m_establish_tab(is, &p->tab, pos);
- return p;
-}
-
-/*
- * Release ISPT.
- */
-void is_pt_free(ISPT ip)
-{
- is_m_release_tab(&ip->tab);
- ispt_free(ip);
-}
-
-/*
- * Read a key from a table.
- */
-int is_readkey(ISPT ip, void *buf)
-{
- return is_m_read_record(&ip->tab, buf, 0);
-}
-
-int is_numkeys(ISPT ip)
-{
- return is_m_num_records(&ip->tab);
-}
-
-void is_rewind(ISPT ip)
-{
- is_m_rewind(&ip->tab);
-}
projects / idzebra-moved-to-github.git / blobdiff