-/*
- * Copyright (c) 2000-2002, Index Data.
- * See the file LICENSE for details.
- *
- * $Id: isamb.c,v 1.17 2002-06-19 10:29:17 adam Exp $
- */
+/* $Id: isamb.c,v 1.23 2003-03-02 23:12:50 adam Exp $
+ Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003
+ 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 <string.h>
#include <yaz/xmalloc.h>
#include <yaz/log.h>
#include <isamb.h>
int last_block;
int block_size;
int block_max;
+ int free_list;
};
#define ISAMB_DATA_OFFSET 3
/* approx 2*4 K + max size of item */
#define DST_BUF_SIZE 8448
+#define ISAMB_CACHE_ENTRY_SIZE 4096
+
+struct ISAMB_cache_entry {
+ ISAMB_P pos;
+ char *buf;
+ int dirty;
+ int hits;
+ struct ISAMB_cache_entry *next;
+};
+
struct ISAMB_file {
BFile bf;
int head_dirty;
struct ISAMB_head head;
+ struct ISAMB_cache_entry *cache_entries;
};
struct ISAMB_s {
struct ISAMB_file *file;
int no_cat;
+ int cache; /* 0=no cache, 1=use cache, -1=dummy isam (for testing only) */
+ int log_io; /* log level for bf_read/bf_write calls */
+ int log_freelist; /* log level for freelist handling */
};
struct ISAMB_block {
int size;
int leaf;
int dirty;
+ int deleted;
int offset;
char *bytes;
unsigned char *buf;
void *decodeClientData;
+ int log_rw;
};
struct ISAMB_PP_s {
(*src) += sizeof(*pos);
}
-ISAMB isamb_open (BFiles bfs, const char *name, int writeflag, ISAMC_M method)
+ISAMB isamb_open (BFiles bfs, const char *name, int writeflag, ISAMC_M method,
+ int cache)
{
ISAMB isamb = xmalloc (sizeof(*isamb));
int i, b_size = 32;
isamb->method = (ISAMC_M) xmalloc (sizeof(*method));
memcpy (isamb->method, method, sizeof(*method));
isamb->no_cat = 4;
+ isamb->log_io = 0;
+ isamb->cache = cache;
isamb->file = xmalloc (sizeof(*isamb->file) * isamb->no_cat);
for (i = 0; i<isamb->no_cat; i++)
{
char fname[DST_BUF_SIZE];
+ isamb->file[i].cache_entries = 0;
isamb->file[i].head_dirty = 0;
sprintf (fname, "%s%c", name, i+'A');
- isamb->file[i].bf = bf_open (bfs, fname, b_size, writeflag);
-
+ if (cache)
+ isamb->file[i].bf = bf_open (bfs, fname, ISAMB_CACHE_ENTRY_SIZE,
+ writeflag);
+ else
+ isamb->file[i].bf = bf_open (bfs, fname, b_size, writeflag);
+
+
if (!bf_read (isamb->file[i].bf, 0, 0, sizeof(struct ISAMB_head),
- &isamb->file[i].head))
+ &isamb->file[i].head))
{
- isamb->file[i].head.first_block = 1;
- isamb->file[i].head.last_block = 1;
+ isamb->file[i].head.first_block = ISAMB_CACHE_ENTRY_SIZE/b_size+1;
+ isamb->file[i].head.last_block = isamb->file[i].head.first_block;
isamb->file[i].head.block_size = b_size;
isamb->file[i].head.block_max = b_size - ISAMB_DATA_OFFSET;
+ isamb->file[i].head.free_list = 0;
}
assert (isamb->file[i].head.block_size >= ISAMB_DATA_OFFSET);
isamb->file[i].head_dirty = 0;
+ assert(isamb->file[i].head.block_size == b_size);
b_size = b_size * 4;
}
return isamb;
}
+static void flush_blocks (ISAMB b, int cat)
+{
+ while (b->file[cat].cache_entries)
+ {
+ struct ISAMB_cache_entry *ce_this = b->file[cat].cache_entries;
+ b->file[cat].cache_entries = ce_this->next;
+
+ if (ce_this->dirty)
+ {
+ yaz_log (b->log_io, "bf_write: flush_blocks");
+ bf_write (b->file[cat].bf, ce_this->pos, 0, 0, ce_this->buf);
+ }
+ xfree (ce_this->buf);
+ xfree (ce_this);
+ }
+}
+
+static int get_block (ISAMB b, ISAMC_P pos, char *userbuf, int wr)
+{
+ int cat = pos&3;
+ int off = ((pos/4) &
+ (ISAMB_CACHE_ENTRY_SIZE / b->file[cat].head.block_size - 1))
+ * b->file[cat].head.block_size;
+ int norm = pos / (4*ISAMB_CACHE_ENTRY_SIZE / b->file[cat].head.block_size);
+ int no = 0;
+ struct ISAMB_cache_entry **ce, *ce_this = 0, **ce_last = 0;
+
+ if (!b->cache)
+ return 0;
+
+ assert (ISAMB_CACHE_ENTRY_SIZE >= b->file[cat].head.block_size);
+ for (ce = &b->file[cat].cache_entries; *ce; ce = &(*ce)->next, no++)
+ {
+ ce_last = ce;
+ if ((*ce)->pos == norm)
+ {
+ ce_this = *ce;
+ *ce = (*ce)->next; /* remove from list */
+
+ ce_this->next = b->file[cat].cache_entries; /* move to front */
+ b->file[cat].cache_entries = ce_this;
+
+ if (wr)
+ {
+ memcpy (ce_this->buf + off, userbuf,
+ b->file[cat].head.block_size);
+ ce_this->dirty = 1;
+ }
+ else
+ memcpy (userbuf, ce_this->buf + off,
+ b->file[cat].head.block_size);
+ return 1;
+ }
+ }
+ if (no >= 40)
+ {
+ assert (no == 40);
+ assert (ce_last && *ce_last);
+ ce_this = *ce_last;
+ *ce_last = 0; /* remove the last entry from list */
+ if (ce_this->dirty)
+ {
+ yaz_log (b->log_io, "bf_write: get_block");
+ bf_write (b->file[cat].bf, ce_this->pos, 0, 0, ce_this->buf);
+ }
+ xfree (ce_this->buf);
+ xfree (ce_this);
+ }
+ ce_this = xmalloc (sizeof(*ce_this));
+ ce_this->next = b->file[cat].cache_entries;
+ b->file[cat].cache_entries = ce_this;
+ ce_this->buf = xmalloc (ISAMB_CACHE_ENTRY_SIZE);
+ ce_this->pos = norm;
+ yaz_log (b->log_io, "bf_read: get_block");
+ if (!bf_read (b->file[cat].bf, norm, 0, 0, ce_this->buf))
+ memset (ce_this->buf, 0, ISAMB_CACHE_ENTRY_SIZE);
+ if (wr)
+ {
+ memcpy (ce_this->buf + off, userbuf, b->file[cat].head.block_size);
+ ce_this->dirty = 1;
+ }
+ else
+ {
+ ce_this->dirty = 0;
+ memcpy (userbuf, ce_this->buf + off, b->file[cat].head.block_size);
+ }
+ return 1;
+}
+
+
void isamb_close (ISAMB isamb)
{
int i;
for (i = 0; i<isamb->no_cat; i++)
{
+ flush_blocks (isamb, i);
if (isamb->file[i].head_dirty)
bf_write (isamb->file[i].bf, 0, 0,
sizeof(struct ISAMB_head), &isamb->file[i].head);
+
+ bf_close (isamb->file[i].bf);
}
xfree (isamb->file);
xfree (isamb->method);
xfree (isamb);
}
+
struct ISAMB_block *open_block (ISAMB b, ISAMC_P pos)
{
int cat = pos&3;
p->pos = pos;
p->cat = pos & 3;
p->buf = xmalloc (b->file[cat].head.block_size);
- if (!bf_read (b->file[cat].bf, pos/4, 0, 0, p->buf))
+
+ if (!get_block (b, pos, p->buf, 0))
{
- yaz_log (LOG_FATAL, "read failure for pos=%ld block=%ld",
- (long) pos, (long) pos/4);
- abort();
+ yaz_log (b->log_io, "bf_read: open_block");
+ if (!bf_read (b->file[cat].bf, pos/4, 0, 0, p->buf))
+ {
+ yaz_log (LOG_FATAL, "read failure for pos=%ld block=%ld",
+ (long) pos, (long) pos/4);
+ abort();
+ }
}
p->bytes = p->buf + ISAMB_DATA_OFFSET;
p->leaf = p->buf[0];
p->size = p->buf[1] + 256 * p->buf[2] - ISAMB_DATA_OFFSET;
p->offset = 0;
p->dirty = 0;
+ p->deleted = 0;
p->decodeClientData = (*b->method->code_start)(ISAMC_DECODE);
return p;
}
struct ISAMB_block *new_block (ISAMB b, int leaf, int cat)
{
struct ISAMB_block *p;
- int block_no;
-
+
p = xmalloc (sizeof(*p));
- block_no = b->file[cat].head.last_block++;
- p->cat = cat;
- p->pos = block_no * 4 + cat;
+ p->buf = xmalloc (b->file[cat].head.block_size);
+
+ if (!b->file[cat].head.free_list)
+ {
+ int block_no;
+ block_no = b->file[cat].head.last_block++;
+ p->pos = block_no * 4 + cat;
+ }
+ else
+ {
+ p->pos = b->file[cat].head.free_list;
+ if (!get_block (b, p->pos, p->buf, 0))
+ {
+ yaz_log (b->log_io, "bf_read: new_block");
+ if (!bf_read (b->file[cat].bf, p->pos/4, 0, 0, p->buf))
+ {
+ yaz_log (LOG_FATAL, "read failure for pos=%ld block=%ld",
+ (long) p->pos/4, (long) p->pos/4);
+ abort ();
+ }
+ }
+ yaz_log (b->log_freelist, "got block %d from freelist %d:%d", p->pos,
+ cat, p->pos/4);
+ memcpy (&b->file[cat].head.free_list, p->buf, sizeof(int));
+ }
p->cat = cat;
b->file[cat].head_dirty = 1;
- p->buf = xmalloc (b->file[cat].head.block_size);
memset (p->buf, 0, b->file[cat].head.block_size);
p->bytes = p->buf + ISAMB_DATA_OFFSET;
p->leaf = leaf;
p->size = 0;
p->dirty = 1;
+ p->deleted = 0;
p->offset = 0;
p->decodeClientData = (*b->method->code_start)(ISAMC_DECODE);
return p;
{
if (!p)
return;
- if (p->dirty)
+ if (p->deleted)
+ {
+ yaz_log (b->log_freelist, "release block %d from freelist %d:%d",
+ p->pos, p->cat, p->pos/4);
+ memcpy (p->buf, &b->file[p->cat].head.free_list, sizeof(int));
+ b->file[p->cat].head.free_list = p->pos;
+ if (!get_block (b, p->pos, p->buf, 1))
+ {
+ yaz_log (b->log_io, "bf_write: close_block");
+ bf_write (b->file[p->cat].bf, p->pos/4, 0, 0, p->buf);
+ }
+ }
+ else if (p->dirty)
{
int size = p->size + ISAMB_DATA_OFFSET;
p->buf[0] = p->leaf;
p->buf[1] = size & 255;
p->buf[2] = size >> 8;
- bf_write (b->file[p->cat].bf, p->pos/4, 0, 0, p->buf);
+ if (!get_block (b, p->pos, p->buf, 1))
+ {
+ yaz_log (b->log_io, "bf_write: close_block");
+ bf_write (b->file[p->cat].bf, p->pos/4, 0, 0, p->buf);
+ }
}
(*b->method->code_stop)(ISAMC_DECODE, p->decodeClientData);
xfree (p->buf);
new_size > b->file[p->cat].head.block_max)
{
/* non-btree block will be removed */
+ p->deleted = 1;
close_block (b, p);
/* delete it too!! */
p = 0; /* make a new one anyway */
int i_mode;
int more;
+ if (b->cache < 0)
+ {
+ int more = 1;
+ while (more)
+ {
+ item_ptr = item_buf;
+ more =
+ (*stream->read_item)(stream->clientData, &item_ptr, &i_mode);
+ }
+ return 1;
+ }
item_ptr = item_buf;
more = (*stream->read_item)(stream->clientData, &item_ptr, &i_mode);
while (more)
void isamb_pp_close (ISAMB_PP pp)
{
- return isamb_pp_close_x (pp, 0, 0);
+ isamb_pp_close_x (pp, 0, 0);
}
int isamb_pp_read (ISAMB_PP pp, void *buf)
projects / idzebra-moved-to-github.git / blobdiff