Revert: MDEV-22351 InnoDB may recover wrong information after RESET MASTER

This commit can cause the wrong (old) binlog position to be recovered by
mariabackup --prepare. It implements that the value of the FIL_PAGE_LSN is
compared to determine which binlog position is the last one and should be
recoved. However, it is not guaranteed that the FIL_PAGE_LSN order matches the
commit order, as is assumed by the code. This is because the page LSN could be
modified by an unrelated update of the page after the commit.

In one example, the recovery first encountered this in trx_rseg_mem_restore():

  lsn=27282754  binlog position (./master-bin.000001, 472908)

and then later:

  lsn=27282699  binlog position (./master-bin.000001, 477164)

The last one 477164 is the correct position. However, because the LSN
encountered for the first one is higher, that position is recovered instead.
This results in too old binlog position, and a newly provisioned slave will
start replicating too early and get duplicate key error or similar.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Author: knielsen

storage/innobase/include/trx0sys.h

@@ -867,8 +867,6 @@ class trx_sys_t
   uint64_t recovered_binlog_offset;
   /** Latest recovered binlog file name */
   char recovered_binlog_filename[TRX_SYS_MYSQL_LOG_NAME_LEN];
-  /** FIL_PAGE_LSN of the page with the latest recovered binlog metadata */
-  lsn_t recovered_binlog_lsn;
 
 
   /**

storage/innobase/trx/trx0rseg.cc

@@ -451,13 +451,8 @@ static dberr_t trx_undo_lists_init(trx_rseg_t *rseg, trx_id_t &max_trx_id,
 static dberr_t trx_rseg_mem_restore(trx_rseg_t *rseg, trx_id_t &max_trx_id,
                                     mtr_t *mtr)
 {
-	/* This is based on trx_rsegf_get_new().
-	We need to access buf_block_t. */
-	buf_block_t *block = buf_page_get(
-		page_id_t(rseg->space->id, rseg->page_no), 0, RW_S_LATCH, mtr);
-	buf_block_dbg_add_level(block, SYNC_RSEG_HEADER_NEW);
-
-	const trx_rsegf_t* rseg_header = TRX_RSEG + block->frame;
+	trx_rsegf_t*	rseg_header = trx_rsegf_get_new(
+		rseg->space->id, rseg->page_no, mtr);
 
 	if (mach_read_from_4(rseg_header + TRX_RSEG_FORMAT) == 0) {
 		trx_id_t id = mach_read_from_8(rseg_header
@@ -468,20 +463,32 @@ static dberr_t trx_rseg_mem_restore(trx_rseg_t *rseg, trx_id_t &max_trx_id,
 		}
 
 		if (rseg_header[TRX_RSEG_BINLOG_NAME]) {
-			lsn_t lsn = std::max(block->page.newest_modification,
-					     mach_read_from_8(FIL_PAGE_LSN
-							      + block->frame));
+			const char* binlog_name = reinterpret_cast<const char*>
+				(rseg_header) + TRX_RSEG_BINLOG_NAME;
 			compile_time_assert(TRX_RSEG_BINLOG_NAME_LEN == sizeof
 					    trx_sys.recovered_binlog_filename);
-			if (lsn > trx_sys.recovered_binlog_lsn) {
-				trx_sys.recovered_binlog_lsn = lsn;
-				trx_sys.recovered_binlog_offset
-					= mach_read_from_8(
-						rseg_header
-						+ TRX_RSEG_BINLOG_OFFSET);
-				memcpy(trx_sys.recovered_binlog_filename,
-				       rseg_header + TRX_RSEG_BINLOG_NAME,
-				       TRX_RSEG_BINLOG_NAME_LEN);
+
+			int cmp = *trx_sys.recovered_binlog_filename
+				? strncmp(binlog_name,
+					  trx_sys.recovered_binlog_filename,
+					  TRX_RSEG_BINLOG_NAME_LEN)
+				: 1;
+
+			if (cmp >= 0) {
+				uint64_t binlog_offset = mach_read_from_8(
+					rseg_header + TRX_RSEG_BINLOG_OFFSET);
+				if (cmp) {
+					memcpy(trx_sys.
+					       recovered_binlog_filename,
+					       binlog_name,
+					       TRX_RSEG_BINLOG_NAME_LEN);
+					trx_sys.recovered_binlog_offset
+						= binlog_offset;
+				} else if (binlog_offset >
+					   trx_sys.recovered_binlog_offset) {
+					trx_sys.recovered_binlog_offset
+						= binlog_offset;
+				}
 			}
 
 #ifdef WITH_WSREP