X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=bfile%2Fcfile.c;h=5b27f49ba1928d8da4e89f84f910326fe0393045;hb=2b1851bd5565e3d21f9cf9a37661a584c063b75f;hp=57be83322c31f325401c28ba20063c4471c4079b;hpb=13b6e86170cf02550bb4abc6e1598d09be7d5bae;p=idzebra-moved-to-github.git

diff --git a/bfile/cfile.c b/bfile/cfile.c
index 57be833..5b27f49 100644
--- a/bfile/cfile.c
+++ b/bfile/cfile.c
@@ -1,10 +1,71 @@
 /*
- * Copyright (C) 1995, Index Data I/S 
+ * Copyright (C) 1995-2000, Index Data ApS
  * All rights reserved.
- * Sebastian Hammer, Adam Dickmeiss
  *
  * $Log: cfile.c,v $
- * Revision 1.7  1995-12-15 10:35:07  adam
+ * Revision 1.26  2000-03-20 19:08:35  adam
+ * Added remote record import using Z39.50 extended services and Segment
+ * Requests.
+ *
+ * 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
@@ -32,7 +93,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <alexutil.h>
+#include <zebrautl.h>
 #include <mfile.h>
 #include "cfile.h"
 
@@ -42,7 +103,9 @@ static int write_head (CFile cf)
     int bno = 1;
     const char *tab = (char*) cf->array;
 
-    while (left >= HASH_BSIZE)
+    if (!tab)
+        return 0;
+    while (left >= (int) HASH_BSIZE)
     {
         mf_write (cf->hash_mf, bno++, 0, 0, tab);
         tab += HASH_BSIZE;
@@ -59,7 +122,9 @@ static int read_head (CFile cf)
     int bno = 1;
     char *tab = (char*) cf->array;
 
-    while (left >= HASH_BSIZE)
+    if (!tab)
+        return 0;
+    while (left >= (int) HASH_BSIZE)
     {
         mf_read (cf->hash_mf, bno++, 0, 0, tab);
         tab += HASH_BSIZE;
@@ -74,12 +139,13 @@ static int read_head (CFile cf)
 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));
+    CFile cf = (CFile) xmalloc (sizeof(*cf));
     int hash_bytes;
    
     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)))
     {
@@ -99,14 +165,14 @@ CFile cf_open (MFile mf, MFile_area area, const char *fname,
         *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)
             mf_write (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head);
-        cf->array = xmalloc (hash_bytes);
+        cf->array = (int *) xmalloc (hash_bytes);
         for (i = 0; i<cf->head.hash_size; i++)
             cf->array[i] = 0;
         if (wflag)
@@ -116,21 +182,34 @@ CFile cf_open (MFile mf, MFile_area area, const char *fname,
     {
         *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 = (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 = 400;
+    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;
+    zebra_mutex_init (&cf->mutex);
     return cf;
 }
 
@@ -185,7 +264,7 @@ static struct CFile_hash_bucket *alloc_bucket (CFile cf, int block_no, int hno)
         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;
@@ -219,13 +298,13 @@ static struct CFile_hash_bucket *get_bucket (CFile cf, int block_no, int hno)
     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++)
     {
@@ -233,12 +312,22 @@ static struct CFile_hash_bucket *new_bucket (CFile cf, int *block_no, int hno)
         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;
@@ -248,7 +337,10 @@ int cf_lookup (CFile cf, int no)
     {
         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)
     {
@@ -259,6 +351,24 @@ int cf_lookup (CFile cf, int no)
         }
         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)
@@ -267,19 +377,78 @@ int cf_lookup (CFile cf, int 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;
@@ -297,6 +466,19 @@ int cf_new (CFile cf, int no)
             }
         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++)
@@ -318,14 +500,33 @@ int cf_new (CFile cf, int no)
     return vno;
 }
 
-int cf_read (CFile cf, int no, int offset, int num, void *buf)
+int cf_new (CFile cf, int no)
+{
+    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);
+    zebra_mutex_lock (&cf->mutex);
     if (!(block = cf_lookup (cf, no)))
+    {
+	zebra_mutex_unlock (&cf->mutex);
         return -1;
-    if (!mf_read (cf->block_mf, block, offset, num, buf))
+    }
+    zebra_mutex_unlock (&cf->mutex);
+    if (!mf_read (cf->block_mf, block, offset, nbytes, buf))
     {
         logf (LOG_FATAL|LOG_ERRNO, "cf_read no=%d, block=%d", no, block);
         exit (1);
@@ -333,24 +534,26 @@ int cf_read (CFile cf, int no, int offset, int num, void *buf)
     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;
 
     assert (cf);
+    zebra_mutex_lock (&cf->mutex);
     if (!(block = cf_lookup (cf, no)))
     {
         block = cf_new (cf, no);
-        if (offset || num)
+        if (offset || nbytes)
         {
             mf_read (cf->rmf, no, 0, 0, cf->iobuf);
-            memcpy (cf->iobuf + offset, buf, num);
+            memcpy (cf->iobuf + offset, buf, nbytes);
             buf = cf->iobuf;
             offset = 0;
-            num = 0;
+            nbytes = 0;
         }
     }
-    if (mf_write (cf->block_mf, block, offset, num, buf))
+    zebra_mutex_unlock (&cf->mutex);
+    if (mf_write (cf->block_mf, block, offset, nbytes, buf))
     {
         logf (LOG_FATAL|LOG_ERRNO, "cf_write no=%d, block=%d", no, block);
         exit (1);
@@ -360,6 +563,9 @@ int cf_write (CFile cf, int no, int offset, int num, const void *buf)
 
 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)
     {
@@ -371,6 +577,7 @@ int cf_close (CFile cf)
     xfree (cf->array);
     xfree (cf->parray);
     xfree (cf->iobuf);
+    zebra_mutex_destroy (&cf->mutex);
     xfree (cf);
     return 0;
 }