Use my_b_append instead of my_b_write on a SEQ_READ_APPEND cache, when we write

the first 4 bytes of the relay log. Indeed comments in mysys/mf_iocache.c 
say we must always use my_b_append for such a cache.
This *could* avoid a very rare assertion failure which is: 
030524 19:32:38  Slave SQL thread initialized, starting replication in log 'FIRST' at position 0, relay log '/
users/gbichot/4.1.1/mysql-test/var/log/slave-relay-bin.000001' position: 4
030524 19:32:38  next log '/users/gbichot/4.1.1/mysql-test/var/log/slave-relay-bin.000002' is currently active
mysqld: mf_iocache.c:701: _my_b_seq_read: Assertion `pos_in_file == info->end_of_file' failed.
and which seemed to happen always when the SQL thread and/or the I/O thread
were at position 4 in a relay log.


include/my_sys.h:
  moving a function from log_event.cc so that it can be widely used
mysys/mf_iocache.c:
  moving a function from log_event.cc so that it can be widely used
sql/log.cc:
  my_b_write should not be used on a SEQ_READ_APPEND cache, one should use my_b_append
  (otherwise there could be some locking problems).
sql/log_event.cc:
  moved to mysys/mf_iocache.c for wider use.
  A typo.

1 files changed, 1 insertions, 1 deletions

diff --git a/sql/log.cc b/sql/log.cc
index 17715620950..4dce26d23ea 100644
--- a/sql/log.cc
+++ b/sql/log.cc
@@ -263,7 +263,7 @@ bool MYSQL_LOG::open(const char *log_name, enum_log_type log_type_arg,
 	an extension for the binary log files.
 	In this case we write a standard header to it.
       */
-      if (my_b_write(&log_file, (byte*) BINLOG_MAGIC, BIN_LOG_HEADER_SIZE))
+      if (my_b_safe_write(&log_file, (byte*) BINLOG_MAGIC, BIN_LOG_HEADER_SIZE))
         goto err;
       bytes_written += BIN_LOG_HEADER_SIZE;
       write_file_name_to_index_file=1;