bk commit into 5.0 tree (acurtis:1.2224) BUG#15669

[antony]

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5.0 repository of antony. When antony does a push these changes will
be propagated to the main repository and, within 24 hours after the
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ChangeSet@stripped, 2006-07-21 14:16:46-07:00, acurtis@stripped +1 -0
  Bug#15669
    "CSV test giving incorrect results on OpenBSD"
    Force invalidation of cached mmap pages

  sql/examples/ha_tina.cc@stripped, 2006-07-21 14:16:37-07:00, acurtis@stripped +40 -8
    Bug#15669
      "CSV test giving incorrect results on OpenBSD"
      Force invalidation of cached mmap pages when file is altered via
      traditional I/O primatives

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	acurtis
# Host:	ltantony.xiphis.org
# Root:	/opt2/tmp/openbsd/p2-bug15669.2

--- 1.22/sql/examples/ha_tina.cc	2006-07-21 14:16:55 -07:00
+++ 1.23/sql/examples/ha_tina.cc	2006-07-21 14:16:55 -07:00
@@ -101,13 +101,28 @@
   return (byte*) share->table_name;
 }
 
+
+int free_mmap(TINA_SHARE *share)
+{
+  DBUG_ENTER("ha_tina::free_mmap");
+  if (share->mapped_file)
+  {
+    msync(share->mapped_file, 0, MS_INVALIDATE);
+    if (munmap(share->mapped_file, share->file_stat.st_size))
+      DBUG_RETURN(1);
+  }
+  share->mapped_file= NULL;
+  DBUG_RETURN(0);
+}
+
 /*
   Reloads the mmap file.
 */
 int get_mmap(TINA_SHARE *share, int write)
 {
   DBUG_ENTER("ha_tina::get_mmap");
-  if (share->mapped_file && munmap(share->mapped_file, share->file_stat.st_size))
+  
+  if (free_mmap(share))
     DBUG_RETURN(1);
 
   if (my_fstat(share->data_file, &share->file_stat, MYF(MY_WME)) == -1)
@@ -230,8 +245,7 @@
   int result_code= 0;
   if (!--share->use_count){
     /* Drop the mapped file */
-    if (share->mapped_file) 
-      munmap(share->mapped_file, share->file_stat.st_size);
+    free_mmap(share);
     result_code= my_close(share->data_file,MYF(0));
     hash_delete(&tina_open_tables, (byte*) share);
     thr_lock_delete(&share->lock);
@@ -493,6 +507,9 @@
 
   size= encode_quote(buf);
 
+  if (free_mmap(share))
+    DBUG_RETURN(-1);
+
   if (my_write(share->data_file, buffer.ptr(), size, MYF(MY_WME | MY_NABP)))
     DBUG_RETURN(-1);
 
@@ -534,8 +551,22 @@
   if (chain_append())
     DBUG_RETURN(-1);
 
+  if (free_mmap(share))
+    DBUG_RETURN(-1);
+
   if (my_write(share->data_file, buffer.ptr(), size, MYF(MY_WME | MY_NABP)))
     DBUG_RETURN(-1);
+
+  /* 
+    Ok, this is means that we will be doing potentially bad things 
+    during a bulk insert on some OS'es. What we need is a cleanup
+    call for ::write_row that would let us fix up everything after the bulk
+    insert. The archive handler does this with an extra mutx call, which
+    might be a solution for this.
+  */
+  if (get_mmap(share, 0) > 0) 
+    DBUG_RETURN(-1);
+
   DBUG_RETURN(0);
 }
 
@@ -812,15 +843,13 @@
       length= length - (size_t)(ptr->end - ptr->begin);
     }
 
-    /* Truncate the file to the new size */
-    if (my_chsize(share->data_file, length, 0, MYF(MY_WME)))
+    if (free_mmap(share))
       DBUG_RETURN(-1);
 
-    if (munmap(share->mapped_file, length))
+    /* Truncate the file to the new size */
+    if (my_chsize(share->data_file, length, 0, MYF(MY_WME)))
       DBUG_RETURN(-1);
 
-    /* We set it to null so that get_mmap() won't try to unmap it */
-    share->mapped_file= NULL;
     if (get_mmap(share, 0) > 0) 
       DBUG_RETURN(-1);
   }
@@ -837,6 +866,9 @@
 
   if (!records_is_known)
     return (my_errno=HA_ERR_WRONG_COMMAND);
+
+  if (free_mmap(share)) 
+    DBUG_RETURN(-1);
 
   int rc= my_chsize(share->data_file, 0, 0, MYF(MY_WME));