bk commit into 4.1 tree (heikki:1.2375)

[Heikki Tuuri]

Below is the list of changes that have just been committed into a local
4.1 repository of heikki. When heikki does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
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ChangeSet
  1.2375 05/08/03 18:21:38 heikki@stripped +1 -0
  buf0buf.c:
    Fix a bug: InnoDB could in a crash recovery print a big false corruption warning if
the first page of an ibdata file was 'recreated' in the buffer pool; this could happen,
for example, if a table was dropped, and the page used later

  innobase/buf/buf0buf.c
    1.40 05/07/08 17:47:42 heikki@stripped +9 -0
    Fix a bug: InnoDB could in a crash recovery print a big false corruption warning if
the first page of an ibdata file was 'recreated' in the buffer pool; this could happen,
for example, if a table was dropped, and the page used later

# 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:	heikki
# Host:	hundin.mysql.fi
# Root:	/home/heikki/mysql-4.1

--- 1.39/innobase/buf/buf0buf.c	2004-11-26 00:09:23 +02:00
+++ 1.40/innobase/buf/buf0buf.c	2005-07-08 17:47:42 +03:00
@@ -1762,6 +1762,15 @@
 	buf_flush_free_margin();
 
 	frame = block->frame;
+
+	/* Reset to zero the file flush lsn field in the page; if the first
+	page of an ibdata file is 'created' in this function into the buffer
+	pool then we lose the original contents of the file flush lsn stamp.
+	Then InnoDB could in a crash recovery print a big, false, corruption
+	warning if the stamp contains an lsn bigger than the ib_logfile lsn. */
+
+	memset(frame + FIL_PAGE_FILE_FLUSH_LSN, 0, 8);
+
 #ifdef UNIV_DEBUG
 	buf_dbg_counter++;