/*
- * Copyright (C) 1995, Index Data I/S
+ * Copyright (C) 1995-1999, Index Data ApS
* All rights reserved.
* Sebastian Hammer, Adam Dickmeiss
*
* $Log: cfile.c,v $
- * Revision 1.2 1995-11-30 17:00:49 adam
+ * Revision 1.25 1999-05-26 07:49:12 adam
+ * C++ compilation.
+ *
+ * Revision 1.24 1999/05/12 13:08:06 adam
+ * First version of ISAMS.
+ *
+ * Revision 1.23 1998/10/15 13:09:29 adam
+ * Minor changes.
+ *
+ * Revision 1.22 1998/10/13 20:07:22 adam
+ * Changed some log messages.
+ *
+ * Revision 1.21 1998/08/24 17:29:52 adam
+ * Minor changes.
+ *
+ * Revision 1.20 1998/08/07 15:07:13 adam
+ * Fixed but in cf_commit_flat.
+ *
+ * Revision 1.19 1997/02/12 20:37:17 adam
+ * Changed the messages logged. No real code changed.
+ *
+ * Revision 1.18 1996/10/29 13:56:15 adam
+ * Include of zebrautl.h instead of alexutil.h.
+ *
+ * Revision 1.17 1996/04/19 16:49:00 adam
+ * Minor changes.
+ *
+ * Revision 1.16 1996/04/19 16:23:47 adam
+ * Serious bug fix in shadow implementation; function new_bucket might
+ * set wrong bucket number on new bucket.
+ *
+ * Revision 1.15 1996/04/18 16:02:56 adam
+ * Changed logging a bit.
+ * Removed warning message when commiting flat shadow files.
+ *
+ * Revision 1.14 1996/04/12 07:01:55 adam
+ * Yet another bug fix (next_block was initialized to 0; now set to 1).
+ *
+ * Revision 1.13 1996/04/09 14:48:49 adam
+ * Bug fix: offset calculation when using flat files was completely broken.
+ *
+ * Revision 1.12 1996/04/09 06:47:28 adam
+ * Function scan_areadef doesn't use sscanf (%n fails on this Linux).
+ *
+ * Revision 1.11 1996/03/26 15:59:05 adam
+ * The directory of the shadow table file can be specified by the new
+ * bf_lockDir call.
+ *
+ * Revision 1.10 1996/02/07 14:03:46 adam
+ * Work on flat indexed shadow files.
+ *
+ * Revision 1.9 1996/02/07 10:08:43 adam
+ * Work on flat shadow (not finished yet).
+ *
+ * Revision 1.8 1995/12/15 12:36:52 adam
+ * Moved hash file information to union.
+ * Renamed commit files.
+ *
+ * Revision 1.7 1995/12/15 10:35:07 adam
+ * Changed names of commit files.
+ *
+ * Revision 1.6 1995/12/11 09:03:53 adam
+ * New function: cf_unlink.
+ * New member of commit file head: state (0) deleted, (1) hash file.
+ *
+ * Revision 1.5 1995/12/08 16:21:14 adam
+ * Work on commit/update.
+ *
+ * Revision 1.4 1995/12/01 16:24:28 adam
+ * Commit files use separate meta file area.
+ *
+ * Revision 1.3 1995/12/01 11:37:22 adam
+ * Cached/commit files implemented as meta-files.
+ *
+ * Revision 1.2 1995/11/30 17:00:49 adam
* Several bug fixes. Commit system runs now.
*
* Revision 1.1 1995/11/30 08:33:11 adam
*/
#include <assert.h>
-#include <fcntl.h>
-#include <unistd.h>
#include <stdlib.h>
#include <string.h>
-#include <alexutil.h>
+#include <zebrautl.h>
#include <mfile.h>
#include "cfile.h"
-static int hash_write (CFile cf, const void *buf, size_t bytes)
+static int write_head (CFile cf)
{
- int r;
+ int left = cf->head.hash_size * sizeof(int);
+ int bno = 1;
+ const char *tab = (char*) cf->array;
- r = write (cf->hash_fd, buf, bytes);
- if (r == bytes)
- return bytes;
- if (r == -1)
- logf (LOG_FATAL|LOG_ERRNO, "write in commit hash file");
- else
- logf (LOG_FATAL, "write in commit hash file. "
- "%d bytes instead of %d bytes", r, bytes);
- exit (1);
+ if (!tab)
+ return 0;
+ while (left >= (int) HASH_BSIZE)
+ {
+ mf_write (cf->hash_mf, bno++, 0, 0, tab);
+ tab += HASH_BSIZE;
+ left -= HASH_BSIZE;
+ }
+ if (left > 0)
+ mf_write (cf->hash_mf, bno, 0, left, tab);
return 0;
}
-static int hash_read (CFile cf, void *buf, size_t bytes)
+static int read_head (CFile cf)
{
- int r;
+ int left = cf->head.hash_size * sizeof(int);
+ int bno = 1;
+ char *tab = (char*) cf->array;
- r = read (cf->hash_fd, buf, bytes);
- if (r == bytes)
- return bytes;
- if (r == -1)
- logf (LOG_FATAL|LOG_ERRNO, "read in commit hash file");
- else
- logf (LOG_FATAL, "read in commit hash file. "
- "%d bytes instead of %d bytes", r, bytes);
- abort ();
+ if (!tab)
+ return 0;
+ while (left >= (int) HASH_BSIZE)
+ {
+ mf_read (cf->hash_mf, bno++, 0, 0, tab);
+ tab += HASH_BSIZE;
+ left -= HASH_BSIZE;
+ }
+ if (left > 0)
+ mf_read (cf->hash_mf, bno, 0, left, tab);
return 0;
}
-CFile cf_open (MFile mf, const char *cname, const char *fname,
+
+CFile cf_open (MFile mf, MFile_area area, const char *fname,
int block_size, int wflag, int *firstp)
{
- char path[256];
- int r, i;
- CFile cf = xmalloc (sizeof(*cf));
+ char path[1024];
+ int i;
+ CFile cf = (CFile) xmalloc (sizeof(*cf));
int hash_bytes;
- cf->mf = mf;
- sprintf (path, "%s.%s.b", cname, fname);
- if ((cf->block_fd =
- open (path, wflag ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
+ cf->rmf = mf;
+ logf (LOG_DEBUG, "cf: open %s %s", cf->rmf->name, wflag ? "rdwr" : "rd");
+ sprintf (path, "%s-b", fname);
+ if (!(cf->block_mf = mf_open (area, path, block_size, wflag)))
{
logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", path);
exit (1);
}
- sprintf (path, "%s.%s.h", cname, fname);
- if ((cf->hash_fd =
- open (path, wflag ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
+ sprintf (path, "%s-i", fname);
+ if (!(cf->hash_mf = mf_open (area, path, HASH_BSIZE, wflag)))
{
logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", path);
exit (1);
}
- r = read (cf->hash_fd, &cf->head, sizeof(cf->head));
- if (r != sizeof(cf->head))
+ assert (firstp);
+ if (!mf_read (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head) ||
+ !cf->head.state)
{
*firstp = 1;
- if (r == -1)
- {
- logf (LOG_FATAL|LOG_ERRNO, "read head of %s", path);
- exit (1);
- }
- if (r != 0)
- {
- logf (LOG_FATAL, "illegal head of %s", path);
- exit (1);
- }
+ cf->head.state = 1;
cf->head.block_size = block_size;
- cf->head.hash_size = 401;
+ cf->head.hash_size = 199;
hash_bytes = cf->head.hash_size * sizeof(int);
- cf->head.next_bucket =
+ cf->head.flat_bucket = cf->head.next_bucket = cf->head.first_bucket =
(hash_bytes+sizeof(cf->head))/HASH_BSIZE + 2;
cf->head.next_block = 1;
if (wflag)
- hash_write (cf, &cf->head, sizeof(cf->head));
- cf->array = xmalloc (hash_bytes);
+ mf_write (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head);
+ cf->array = (int *) xmalloc (hash_bytes);
for (i = 0; i<cf->head.hash_size; i++)
cf->array[i] = 0;
if (wflag)
- hash_write (cf, cf->array, hash_bytes);
+ write_head (cf);
}
else
{
*firstp = 0;
assert (cf->head.block_size == block_size);
- assert (cf->head.hash_size > 2 && cf->head.hash_size < 200000);
+ assert (cf->head.hash_size > 2);
hash_bytes = cf->head.hash_size * sizeof(int);
assert (cf->head.next_bucket > 0);
- cf->array = xmalloc (hash_bytes);
- hash_read (cf, cf->array, hash_bytes);
+ assert (cf->head.next_block > 0);
+ if (cf->head.state == 1)
+ cf->array = (int *) xmalloc (hash_bytes);
+ else
+ cf->array = NULL;
+ read_head (cf);
}
- cf->parray = xmalloc (cf->head.hash_size * sizeof(*cf->parray));
- for (i = 0; i<cf->head.hash_size; i++)
- cf->parray[i] = NULL;
+ if (cf->head.state == 1)
+ {
+ cf->parray = (struct CFile_hash_bucket **)
+ xmalloc (cf->head.hash_size * sizeof(*cf->parray));
+ for (i = 0; i<cf->head.hash_size; i++)
+ cf->parray[i] = NULL;
+ }
+ else
+ cf->parray = NULL;
cf->bucket_lru_front = cf->bucket_lru_back = NULL;
cf->bucket_in_memory = 0;
- cf->max_bucket_in_memory = 200;
+ cf->max_bucket_in_memory = 100;
cf->dirty = 0;
- cf->iobuf = xmalloc (cf->head.block_size);
+ cf->iobuf = (char *) xmalloc (cf->head.block_size);
memset (cf->iobuf, 0, cf->head.block_size);
+ cf->no_hits = 0;
+ cf->no_miss = 0;
return cf;
}
break;
if (p->dirty)
{
- if (lseek (cf->hash_fd, p->ph.this_bucket*HASH_BSIZE, SEEK_SET) < 0)
- {
- logf (LOG_FATAL|LOG_ERRNO, "lseek in flush_bucket");
- exit (1);
- }
- hash_write (cf, &p->ph, HASH_BSIZE);
+ mf_write (cf->hash_mf, p->ph.this_bucket, 0, 0, &p->ph);
cf->dirty = 1;
}
release_bucket (cf, p);
flush_bucket (cf, 1);
assert (cf->bucket_in_memory < cf->max_bucket_in_memory);
++(cf->bucket_in_memory);
- p = xmalloc (sizeof(*p));
+ p = (struct CFile_hash_bucket *) xmalloc (sizeof(*p));
p->lru_next = NULL;
p->lru_prev = cf->bucket_lru_front;
struct CFile_hash_bucket *p;
p = alloc_bucket (cf, block_no, hno);
-
- if (lseek (cf->hash_fd, block_no * HASH_BSIZE, SEEK_SET) < 0)
+ if (!mf_read (cf->hash_mf, block_no, 0, 0, &p->ph))
{
- logf (LOG_FATAL|LOG_ERRNO, "lseek in get_bucket");
+ logf (LOG_FATAL|LOG_ERRNO, "read get_bucket");
exit (1);
}
- hash_read (cf, &p->ph, HASH_BSIZE);
assert (p->ph.this_bucket == block_no);
p->dirty = 0;
return p;
}
-static struct CFile_hash_bucket *new_bucket (CFile cf, int *block_no, int hno)
+static struct CFile_hash_bucket *new_bucket (CFile cf, int *block_nop, int hno)
{
struct CFile_hash_bucket *p;
- int i;
+ int i, block_no;
- *block_no = cf->head.next_bucket++;
- p = alloc_bucket (cf, *block_no, hno);
+ block_no = *block_nop = cf->head.next_bucket++;
+ p = alloc_bucket (cf, block_no, hno);
for (i = 0; i<HASH_BUCKET; i++)
{
p->ph.no[i] = 0;
}
p->ph.next_bucket = 0;
- p->ph.this_bucket = *block_no;
+ p->ph.this_bucket = block_no;
p->dirty = 1;
return p;
}
-int cf_lookup (CFile cf, int no)
+static int cf_lookup_flat (CFile cf, int no)
+{
+ int hno = (no*sizeof(int))/HASH_BSIZE;
+ int off = (no*sizeof(int)) - hno*HASH_BSIZE;
+ int vno = 0;
+
+ mf_read (cf->hash_mf, hno+cf->head.next_bucket, off, sizeof(int), &vno);
+ return vno;
+}
+
+static int cf_lookup_hash (CFile cf, int no)
{
int hno = cf_hash (cf, no);
struct CFile_hash_bucket *hb;
{
for (i = 0; i<HASH_BUCKET && hb->ph.vno[i]; i++)
if (hb->ph.no[i] == no)
+ {
+ (cf->no_hits)++;
return hb->ph.vno[i];
+ }
}
for (block_no = cf->array[hno]; block_no; block_no = hb->ph.next_bucket)
{
}
if (hb)
continue;
+#if 0
+ /* extra check ... */
+ for (hb = cf->bucket_lru_back; hb; hb = hb->lru_next)
+ {
+ if (hb->ph.this_bucket == block_no)
+ {
+ logf (LOG_FATAL, "Found hash bucket on other chain (1)");
+ abort ();
+ }
+ for (i = 0; i<HASH_BUCKET && hb->ph.vno[i]; i++)
+ if (hb->ph.no[i] == no)
+ {
+ logf (LOG_FATAL, "Found hash bucket on other chain (2)");
+ abort ();
+ }
+ }
+#endif
+ (cf->no_miss)++;
hb = get_bucket (cf, block_no, hno);
for (i = 0; i<HASH_BUCKET && hb->ph.vno[i]; i++)
if (hb->ph.no[i] == no)
return 0;
}
-int cf_new (CFile cf, int no)
+static void cf_write_flat (CFile cf, int no, int vno)
+{
+ int hno = (no*sizeof(int))/HASH_BSIZE;
+ int off = (no*sizeof(int)) - hno*HASH_BSIZE;
+
+ hno += cf->head.next_bucket;
+ if (hno >= cf->head.flat_bucket)
+ cf->head.flat_bucket = hno+1;
+ cf->dirty = 1;
+ mf_write (cf->hash_mf, hno, off, sizeof(int), &vno);
+}
+
+static void cf_moveto_flat (CFile cf)
+{
+ struct CFile_hash_bucket *p;
+ int i, j;
+
+ logf (LOG_DEBUG, "cf: Moving to flat shadow: %s", cf->rmf->name);
+ logf (LOG_DEBUG, "cf: hits=%d miss=%d bucket_in_memory=%d total=%d",
+ cf->no_hits, cf->no_miss, cf->bucket_in_memory,
+ cf->head.next_bucket - cf->head.first_bucket);
+ assert (cf->head.state == 1);
+ flush_bucket (cf, -1);
+ assert (cf->bucket_in_memory == 0);
+ p = (struct CFile_hash_bucket *) xmalloc (sizeof(*p));
+ for (i = cf->head.first_bucket; i < cf->head.next_bucket; i++)
+ {
+ if (!mf_read (cf->hash_mf, i, 0, 0, &p->ph))
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "read bucket moveto flat");
+ exit (1);
+ }
+ for (j = 0; j < HASH_BUCKET && p->ph.vno[j]; j++)
+ cf_write_flat (cf, p->ph.no[j], p->ph.vno[j]);
+ }
+ xfree (p);
+ xfree (cf->array);
+ cf->array = NULL;
+ xfree (cf->parray);
+ cf->parray = NULL;
+ cf->head.state = 2;
+ cf->dirty = 1;
+}
+
+static int cf_lookup (CFile cf, int no)
+{
+ if (cf->head.state > 1)
+ return cf_lookup_flat (cf, no);
+ return cf_lookup_hash (cf, no);
+}
+
+static int cf_new_flat (CFile cf, int no)
+{
+ int vno = (cf->head.next_block)++;
+
+ cf_write_flat (cf, no, vno);
+ return vno;
+}
+
+static int cf_new_hash (CFile cf, int no)
{
int hno = cf_hash (cf, no);
struct CFile_hash_bucket *hbprev = NULL, *hb = cf->parray[hno];
- int *bucketpp = &cf->array[hno];
- int i;
- int vno = (cf->head.next_block)++;
-
+ int *bucketpp = &cf->array[hno];
+ int i, vno = (cf->head.next_block)++;
+
for (hb = cf->parray[hno]; hb; hb = hb->h_next)
if (!hb->ph.vno[HASH_BUCKET-1])
for (i = 0; i<HASH_BUCKET; i++)
if (!hb->ph.vno[i])
{
+ (cf->no_hits)++;
hb->ph.no[i] = no;
hb->ph.vno[i] = vno;
hb->dirty = 1;
}
if (hb)
continue;
+
+#if 0
+ /* extra check ... */
+ for (hb = cf->bucket_lru_back; hb; hb = hb->lru_next)
+ {
+ if (hb->ph.this_bucket == *bucketpp)
+ {
+ logf (LOG_FATAL, "Found hash bucket on other chain");
+ abort ();
+ }
+ }
+#endif
+ (cf->no_miss)++;
hb = get_bucket (cf, *bucketpp, hno);
assert (hb);
for (i = 0; i<HASH_BUCKET; i++)
return vno;
}
-int cf_read (CFile cf, int no, int offset, int num, void *buf)
+int cf_new (CFile cf, int no)
{
- int tor, block, r;
+ if (cf->head.state > 1)
+ return cf_new_flat (cf, no);
+ if (cf->no_miss*2 > cf->no_hits)
+ {
+ cf_moveto_flat (cf);
+ assert (cf->head.state > 1);
+ return cf_new_flat (cf, no);
+ }
+ return cf_new_hash (cf, no);
+}
+
+
+int cf_read (CFile cf, int no, int offset, int nbytes, void *buf)
+{
+ int block;
assert (cf);
if (!(block = cf_lookup (cf, no)))
return -1;
- if (lseek (cf->block_fd, cf->head.block_size * block + offset,
- SEEK_SET) < 0)
+ if (!mf_read (cf->block_mf, block, offset, nbytes, buf))
{
- logf (LOG_FATAL|LOG_ERRNO, "cf_read, lseek no=%d, block=%d",
- no, block);
- exit (1);
- }
- tor = num ? num : cf->head.block_size;
- r = read (cf->block_fd, buf, tor);
- if (r != tor)
- {
- logf (LOG_FATAL|LOG_ERRNO, "cf_read, read no=%d, block=%d",
- no, block);
+ logf (LOG_FATAL|LOG_ERRNO, "cf_read no=%d, block=%d", no, block);
exit (1);
}
return 1;
}
-int cf_write (CFile cf, int no, int offset, int num, const void *buf)
+int cf_write (CFile cf, int no, int offset, int nbytes, const void *buf)
{
- int block, r, tow;
+ int block;
assert (cf);
if (!(block = cf_lookup (cf, no)))
{
block = cf_new (cf, no);
- if (offset || num)
+ if (offset || nbytes)
{
- mf_read (cf->mf, no, 0, 0, cf->iobuf);
- memcpy (cf->iobuf + offset, buf, num);
+ mf_read (cf->rmf, no, 0, 0, cf->iobuf);
+ memcpy (cf->iobuf + offset, buf, nbytes);
buf = cf->iobuf;
offset = 0;
- num = 0;
+ nbytes = 0;
}
}
- if (lseek (cf->block_fd, cf->head.block_size * block + offset,
- SEEK_SET) < 0)
+ if (mf_write (cf->block_mf, block, offset, nbytes, buf))
{
- logf (LOG_FATAL|LOG_ERRNO, "cf_write, lseek no=%d, block=%d",
- no, block);
- exit (1);
- }
-
- tow = num ? num : cf->head.block_size;
- r = write (cf->block_fd, buf, tow);
- if (r != tow)
- {
- logf (LOG_FATAL|LOG_ERRNO, "cf_write, read no=%d, block=%d",
- no, block);
+ logf (LOG_FATAL|LOG_ERRNO, "cf_write no=%d, block=%d", no, block);
exit (1);
}
return 0;
int cf_close (CFile cf)
{
+ logf (LOG_DEBUG, "cf: close hits=%d miss=%d bucket_in_memory=%d total=%d",
+ cf->no_hits, cf->no_miss, cf->bucket_in_memory,
+ cf->head.next_bucket - cf->head.first_bucket);
flush_bucket (cf, -1);
if (cf->dirty)
{
- int hash_bytes = cf->head.hash_size * sizeof(int);
- if (lseek (cf->hash_fd, 0L, SEEK_SET) < 0)
- {
- logf (LOG_FATAL|LOG_ERRNO, "seek in hash fd");
- exit (1);
- }
- hash_write (cf, &cf->head, sizeof(cf->head));
- hash_write (cf, cf->array, hash_bytes);
- }
- if (close (cf->hash_fd) < 0)
- {
- logf (LOG_FATAL|LOG_ERRNO, "close hash fd");
- exit (1);
- }
- if (close (cf->block_fd) < 0)
- {
- logf (LOG_FATAL|LOG_ERRNO, "close block fd");
- exit (1);
+ mf_write (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head);
+ write_head (cf);
}
+ mf_close (cf->hash_mf);
+ mf_close (cf->block_mf);
xfree (cf->array);
xfree (cf->parray);
xfree (cf->iobuf);
projects / idzebra-moved-to-github.git / blobdiff