* Sebastian Hammer, Adam Dickmeiss
*
* $Log: cfile.c,v $
- * Revision 1.4 1995-12-01 16:24:28 adam
+ * 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
int bno = 1;
const char *tab = (char*) cf->array;
+ if (!tab)
+ return 0;
while (left >= HASH_BSIZE)
{
mf_write (cf->hash_mf, bno++, 0, 0, tab);
int bno = 1;
char *tab = (char*) cf->array;
+ if (!tab)
+ return 0;
while (left >= HASH_BSIZE)
{
mf_read (cf->hash_mf, bno++, 0, 0, tab);
CFile cf_open (MFile mf, MFile_area area, const char *fname,
int block_size, int wflag, int *firstp)
{
- char path[256];
+ char path[1024];
int i;
CFile cf = xmalloc (sizeof(*cf));
int hash_bytes;
cf->rmf = mf;
- sprintf (path, "%s.b", fname);
+ logf (LOG_LOG, "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.h", fname);
+ 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);
}
- if (!mf_read (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head))
+ assert (firstp);
+ if (!mf_read (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head) ||
+ !cf->head.state)
{
*firstp = 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)
{
*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);
+ assert (cf->head.next_block > 0);
+ if (cf->head.state == 1)
+ cf->array = 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 = 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 = 400;
+ cf->max_bucket_in_memory = 100;
cf->dirty = 0;
cf->iobuf = xmalloc (cf->head.block_size);
memset (cf->iobuf, 0, cf->head.block_size);
+ cf->no_hits = 0;
+ cf->no_miss = 0;
return cf;
}
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;
+ (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_LOG, "Moving to flat shadow: %s", cf->rmf->name);
+ logf (LOG_LOG, "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 = 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;
+ (cf->no_miss)++;
hb = get_bucket (cf, *bucketpp, hno);
assert (hb);
for (i = 0; i<HASH_BUCKET; i++)
return vno;
}
+int cf_new (CFile cf, int no)
+{
+ if (cf->head.state > 1)
+ return cf_new_flat (cf, no);
+ if (cf->no_miss*5 > 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 num, void *buf)
{
int block;
int cf_close (CFile cf)
{
+ logf (LOG_LOG, "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)
{
+ logf (LOG_LOG, "dirty. write header");
mf_write (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head);
write_head (cf);
}
xfree (cf->parray);
xfree (cf->iobuf);
xfree (cf);
+ logf (LOG_LOG, "cf_close %s", cf->rmf->name);
return 0;
}
projects / idzebra-moved-to-github.git / blobdiff