Merge mysql.com:/home/svoj/devel/bk/mysql-5.1

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.1-engines


mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/t/disabled.def:
  Auto merged
sql/handler.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged
storage/myisam/ha_myisam.cc:
  Auto merged

include/keycache.h

@@ -44,6 +44,7 @@ typedef struct st_keycache_wqueue
 typedef struct st_key_cache
 {
   my_bool key_cache_inited;
+  my_bool in_resize;             /* true during resize operation             */
   my_bool resize_in_flush;       /* true during flush of resize operation    */
   my_bool can_be_used;           /* usage of cache for read/write is allowed */
   uint key_cache_shift;
@@ -72,6 +73,11 @@ typedef struct st_key_cache
   BLOCK_LINK *used_ins;          /* ptr to the insertion block in LRU chain  */
   pthread_mutex_t cache_lock;    /* to lock access to the cache structure    */
   KEYCACHE_WQUEUE resize_queue;  /* threads waiting during resize operation  */
+  /*
+    Waiting for a zero resize count. Using a queue for symmetry though
+    only one thread can wait here.
+  */
+  KEYCACHE_WQUEUE waiting_for_resize_cnt;
   KEYCACHE_WQUEUE waiting_for_hash_link; /* waiting for a free hash link     */
   KEYCACHE_WQUEUE waiting_for_block;    /* requests waiting for a free block */
   BLOCK_LINK *changed_blocks[CHANGED_BLOCKS_HASH]; /* hash for dirty file bl.*/

include/my_sys.h

@@ -66,8 +66,8 @@ extern int NEAR my_errno;		/* Last error in mysys */
 #define MY_ALLOW_ZERO_PTR 64	/* my_realloc() ; zero ptr -> malloc */
 #define MY_FREE_ON_ERROR 128	/* my_realloc() ; Free old ptr on error */
 #define MY_HOLD_ON_ERROR 256	/* my_realloc() ; Return old ptr on error */
-#define MY_THREADSAFE	128	/* pread/pwrite:  Don't allow interrupts */
 #define MY_DONT_OVERWRITE_FILE 1024	/* my_copy: Don't overwrite file */
+#define MY_THREADSAFE 2048      /* my_seek(): lock fd mutex */
 
 #define MY_CHECK_ERROR	1	/* Params to my_end; Check open-close */
 #define MY_GIVE_INFO	2	/* Give time info about process*/

mysql-test/extra/binlog_tests/blackhole.test

@@ -124,6 +124,16 @@ let $VERSION=`select version()`;
 source include/show_binlog_events.inc;
 drop table t1,t2,t3;
 
+#
+# BUG#27998 - mysqld crashed when executing INSERT DELAYED on a BLACKHOLE
+#             table
+#
+CREATE TABLE t1(a INT) ENGINE=BLACKHOLE;
+INSERT DELAYED INTO t1 VALUES(1);
+DROP TABLE t1;
+
+# End of 4.1 tests
+
 #
 #Bug#19717: DELETE Query Error on BLACKHOLE when using WHERE on column with UNIQUE INDEX
 #
@@ -139,7 +149,8 @@ ALTER TABLE t1 ADD PRIMARY KEY(a);
 DELETE FROM t1 WHERE a=10;
 DROP TABLE t1;
 
-# End of 4.1 tests
+# End of 5.0 tests
+
 # Test that a transaction which is rolled back does not go into binlog
 # and that a transaction which is committed does
 
@@ -156,4 +167,4 @@ set autocommit=1;
 source include/show_binlog_events.inc;
 drop table if exists t1;
 
-# End of 5.0 tests
+# End of 5.1 tests

mysql-test/lib/mtr_io.pl

@@ -120,7 +120,11 @@ sub mtr_get_opts_from_file ($) {
       $arg =~ s/\$(\w+)/envsubst($1)/ge;
 
 #      print STDERR "ARG: $arg\n";
-      push(@args, $arg);
+      # Do not pass empty string since my_getopt is not capable to handle it.
+      if (length($arg))
+      {
+        push(@args, $arg)
+      }
     }
   }
   close FILE;

mysql-test/mysql-test-run.pl

@@ -1766,22 +1766,6 @@ sub environment_setup () {
     push(@ld_library_paths,  "$glob_basedir/storage/ndb/src/.libs");
   }
 
-  # --------------------------------------------------------------------------
-  # Add the path where mysqld will find udf_example.so
-  # --------------------------------------------------------------------------
-  if ( $lib_udf_example )
-  {
-    push(@ld_library_paths, dirname($lib_udf_example));
-  }
-
-  # --------------------------------------------------------------------------
-  # Add the path where mysqld will find ha_example.so
-  # --------------------------------------------------------------------------
-  if ( $lib_example_plugin )
-  {
-    push(@ld_library_paths, dirname($lib_example_plugin));
-  }
-
   # --------------------------------------------------------------------------
   # Valgrind need to be run with debug libraries otherwise it's almost
   # impossible to add correct supressions, that means if "/usr/lib/debug"
@@ -2060,12 +2044,16 @@ sub environment_setup () {
   # ----------------------------------------------------
   $ENV{'UDF_EXAMPLE_LIB'}=
     ($lib_udf_example ? basename($lib_udf_example) : "");
+  $ENV{'UDF_EXAMPLE_LIB_OPT'}=
+    ($lib_udf_example ? "--plugin_dir=" . dirname($lib_udf_example) : "");
 
   # ----------------------------------------------------
   # Add the path where mysqld will find ha_example.so
   # ----------------------------------------------------
   $ENV{'EXAMPLE_PLUGIN'}=
     ($lib_example_plugin ? basename($lib_example_plugin) : "");
+  $ENV{'EXAMPLE_PLUGIN_OPT'}=
+    ($lib_example_plugin ? "--plugin_dir=" . dirname($lib_example_plugin) : "");
 
   # ----------------------------------------------------
   # We are nice and report a bit about our settings
@@ -3821,9 +3809,6 @@ sub mysqld_arguments ($$$$) {
 	mtr_add_arg($args, "%s--ndb-extra-logging", $prefix);
       }
     }
-
-      mtr_add_arg($args, "%s--plugin_dir=%s", $prefix,
-		  dirname($lib_example_plugin));
   }
   else
   {

mysql-test/r/binlog_row_blackhole.result

@@ -121,6 +121,9 @@ master-bin.000001	#	Query	#	#	use `test`; alter table t1 add b int
 master-bin.000001	#	Query	#	#	use `test`; alter table t1 drop b
 master-bin.000001	#	Query	#	#	use `test`; create table t3 like t1
 drop table t1,t2,t3;
+CREATE TABLE t1(a INT) ENGINE=BLACKHOLE;
+INSERT DELAYED INTO t1 VALUES(1);
+DROP TABLE t1;
 CREATE TABLE t1(a INT, b INT) ENGINE=BLACKHOLE;
 DELETE FROM t1 WHERE a=10;
 ALTER TABLE t1 ADD INDEX(a);

mysql-test/r/binlog_stm_blackhole.result

@@ -122,6 +122,9 @@ master-bin.000001	#	Query	#	#	use `test`; create table t3 like t1
 master-bin.000001	#	Query	#	#	use `test`; insert into t1 select * from t3
 master-bin.000001	#	Query	#	#	use `test`; replace into t1 select * from t3
 drop table t1,t2,t3;
+CREATE TABLE t1(a INT) ENGINE=BLACKHOLE;
+INSERT DELAYED INTO t1 VALUES(1);
+DROP TABLE t1;
 CREATE TABLE t1(a INT, b INT) ENGINE=BLACKHOLE;
 DELETE FROM t1 WHERE a=10;
 ALTER TABLE t1 ADD INDEX(a);

mysql-test/r/plugin.result

 CREATE TABLE t1(a int) ENGINE=EXAMPLE;
 Warnings:
-Error	1286	Unknown table engine 'EXAMPLE'
+Warning	1286	Unknown table engine 'EXAMPLE'
+Warning	1266	Using storage engine MyISAM for table 't1'
 DROP TABLE t1;
 INSTALL PLUGIN example SONAME 'ha_example.so';
 INSTALL PLUGIN EXAMPLE SONAME 'ha_example.so';
@@ -11,5 +12,8 @@ CREATE TABLE t1(a int) ENGINE=EXAMPLE;
 SELECT * FROM t1;
 a
 DROP TABLE t1;
+UNINSTALL PLUGIN example;
+UNINSTALL PLUGIN EXAMPLE;
+ERROR 42000: PLUGIN EXAMPLE does not exist
 UNINSTALL PLUGIN non_exist;
 ERROR 42000: PLUGIN non_exist does not exist

mysql-test/t/disabled.def

@@ -37,7 +37,6 @@ synchronization          : Bug#24529  	Test 'synchronization' fails on Mac pushb
 #ndb_binlog_discover      : bug#21806 2006-08-24
 #ndb_autodiscover3        : bug#21806
 
-plugin                   : Bug#25659 memory leak via "plugins" test
 #rpl_ndb_dd_advance	 : Bug#25913 rpl_ndb_dd_advance fails randomly
 
 rpl_ndb_stm_innodb       : Bug#26783

mysql-test/t/plugin-master.opt

+$EXAMPLE_PLUGIN_OPT

mysql-test/t/plugin.test

@@ -18,9 +18,9 @@ SELECT * FROM t1;
 
 DROP TABLE t1;
 
-# Waiting for fix to BUG#22694
-#UNINSTALL PLUGIN example;
-#UNINSTALL PLUGIN EXAMPLE;
+UNINSTALL PLUGIN example;
+--error 1305
+UNINSTALL PLUGIN EXAMPLE;
 
 --error 1305
 UNINSTALL PLUGIN non_exist;

mysql-test/t/rpl_udf-master.opt

+$UDF_EXAMPLE_LIB_OPT

mysql-test/t/rpl_udf-slave.opt

+$UDF_EXAMPLE_LIB_OPT

mysql-test/t/udf-master.opt

+$UDF_EXAMPLE_LIB_OPT

mysql-test/valgrind.supp

@@ -426,6 +426,23 @@
    fun:_dl_map_object
 }
 
+{
+   libc pthread_exit 6
+   Memcheck:Leak
+   fun:malloc
+   fun:_dl_map_object
+   fun:openaux
+   fun:_dl_catch_error 
+}
+
+{
+   libc pthread_exit 7
+   Memcheck:Leak
+   fun:malloc
+   fun:dl_open_worker
+   fun:_dl_catch_error
+   fun:_dl_open
+}
 
 #
 # This is seen internally in the system libraries on 64-bit RHAS3.

mysys/my_seek.c

@@ -23,7 +23,9 @@
   my_off_t pos     The expected position (absolute or relative)
   int whence       A direction parameter and one of 
                    {SEEK_SET, SEEK_CUR, SEEK_END}
-  myf MyFlags      Not used.
+  myf MyFlags      MY_THREADSAFE must be set in case my_seek may be mixed
+                   with my_pread/my_pwrite calls and fd is shared among
+                   threads.
 
   DESCRIPTION
     The my_seek  function  is a wrapper around the system call lseek and
@@ -54,9 +56,16 @@ my_off_t my_seek(File fd, my_off_t pos, int whence,
       Make sure we are using a valid file descriptor!
   */
   DBUG_ASSERT(fd != -1);
-
-  newpos= lseek(fd, pos, whence);
-  
+#if defined(THREAD) && !defined(HAVE_PREAD)
+  if (MyFlags & MY_THREADSAFE)
+  {
+    pthread_mutex_lock(&my_file_info[fd].mutex);
+    newpos= lseek(fd, pos, whence);
+    pthread_mutex_unlock(&my_file_info[fd].mutex);
+  }
+  else
+#endif
+    newpos= lseek(fd, pos, whence);
   if (newpos == (os_off_t) -1)
   {
     my_errno=errno;

mysys/my_static.c

@@ -48,9 +48,6 @@ struct st_remember _my_sig_remember[MAX_SIGNALS]={{0,0}};
 sigset_t my_signals;			/* signals blocked by mf_brkhant */
 #endif
 
-	/* from mf_keycache.c */
-my_bool key_cache_inited=0;
-
 	/* from mf_reccache.c */
 ulong my_default_record_cache_size=RECORD_CACHE_SIZE;
 

sql/handler.cc

@@ -2717,8 +2717,8 @@ int ha_init_key_cache(const char *name, KEY_CACHE *key_cache)
   if (!key_cache->key_cache_inited)
   {
     pthread_mutex_lock(&LOCK_global_system_variables);
-    long tmp_buff_size= (long) key_cache->param_buff_size;
-    long tmp_block_size= (long) key_cache->param_block_size;
+    ulong tmp_buff_size= (ulong) key_cache->param_buff_size;
+    uint tmp_block_size= (uint) key_cache->param_block_size;
     uint division_limit= key_cache->param_division_limit;
     uint age_threshold=  key_cache->param_age_threshold;
     pthread_mutex_unlock(&LOCK_global_system_variables);

sql/sql_table.cc

@@ -4653,8 +4653,13 @@ int reassign_keycache_tables(THD *thd, KEY_CACHE *src_cache,
 bool mysql_preload_keys(THD* thd, TABLE_LIST* tables)
 {
   DBUG_ENTER("mysql_preload_keys");
+  /*
+    We cannot allow concurrent inserts. The storage engine reads
+    directly from the index file, bypassing the cache. It could read
+    outdated information if parallel inserts into cache blocks happen.
+  */
   DBUG_RETURN(mysql_admin_table(thd, tables, 0,
-				"preload_keys", TL_READ, 0, 0, 0, 0,
+				"preload_keys", TL_READ_NO_INSERT, 0, 0, 0, 0,
 				&handler::preload_keys, 0));
 }
 

sql/sql_udf.cc

@@ -169,11 +169,15 @@ void udf_init()
       Ensure that the .dll doesn't have a path
       This is done to ensure that only approved dll from the system
       directories are used (to make this even remotely secure).
+
+      On windows we must check both FN_LIBCHAR and '/'.
     */
     if (my_strchr(files_charset_info, dl_name,
-                  dl_name + strlen(dl_name), FN_LIBCHAR) || 
-                  check_string_char_length(&name, "", NAME_CHAR_LEN,
-                                           system_charset_info, 1))
+                  dl_name + strlen(dl_name), FN_LIBCHAR) ||
+        IF_WIN(my_strchr(files_charset_info, dl_name,
+                         dl_name + strlen(dl_name), '/'), 0) ||
+        check_string_char_length(&name, "", NAME_CHAR_LEN,
+                                 system_charset_info, 1))
     {
       sql_print_error("Invalid row in mysql.func table for function '%.64s'",
                       name.str);
@@ -190,10 +194,13 @@ void udf_init()
     void *dl = find_udf_dl(tmp->dl);
     if (dl == NULL)
     {
-      if (!(dl= dlopen(tmp->dl, RTLD_NOW)))
+      char dlpath[FN_REFLEN];
+      strxnmov(dlpath, sizeof(dlpath) - 1, opt_plugin_dir, "/", tmp->dl,
+               NullS);
+      if (!(dl= dlopen(dlpath, RTLD_NOW)))
       {
 	/* Print warning to log */
-	sql_print_error(ER(ER_CANT_OPEN_LIBRARY), tmp->dl, errno, dlerror());
+        sql_print_error(ER(ER_CANT_OPEN_LIBRARY), tmp->dl, errno, dlerror());
 	/* Keep the udf in the hash so that we can remove it later */
 	continue;
       }
@@ -394,8 +401,13 @@ int mysql_create_function(THD *thd,udf_func *udf)
     Ensure that the .dll doesn't have a path
     This is done to ensure that only approved dll from the system
     directories are used (to make this even remotely secure).
+
+    On windows we must check both FN_LIBCHAR and '/'.
   */
-  if (my_strchr(files_charset_info, udf->dl, udf->dl + strlen(udf->dl), FN_LIBCHAR))
+  if (my_strchr(files_charset_info, udf->dl,
+                udf->dl + strlen(udf->dl), FN_LIBCHAR) ||
+      IF_WIN(my_strchr(files_charset_info, udf->dl,
+                       udf->dl + strlen(udf->dl), '/'), 0))
   {
     my_message(ER_UDF_NO_PATHS, ER(ER_UDF_NO_PATHS), MYF(0));
     DBUG_RETURN(1);
@@ -422,10 +434,12 @@ int mysql_create_function(THD *thd,udf_func *udf)
   }
   if (!(dl = find_udf_dl(udf->dl)))
   {
-    if (!(dl = dlopen(udf->dl, RTLD_NOW)))
+    char dlpath[FN_REFLEN];
+    strxnmov(dlpath, sizeof(dlpath) - 1, opt_plugin_dir, "/", udf->dl, NullS);
+    if (!(dl = dlopen(dlpath, RTLD_NOW)))
     {
       DBUG_PRINT("error",("dlopen of %s failed, error: %d (%s)",
-			  udf->dl, errno, dlerror()));
+                          udf->dl, errno, dlerror()));
       my_error(ER_CANT_OPEN_LIBRARY, MYF(0),
                udf->dl, errno, dlerror());
       goto err;

storage/blackhole/ha_blackhole.cc

@@ -31,6 +31,14 @@ static handler *blackhole_create_handler(handlerton *hton,
 }
 
 
+/* Static declarations for shared structures */
+
+static pthread_mutex_t blackhole_mutex;
+static HASH blackhole_open_tables;
+
+static st_blackhole_share *get_share(const char *table_name);
+static void free_share(st_blackhole_share *share);
+
 /*****************************************************************************
 ** BLACKHOLE tables
 *****************************************************************************/
@@ -53,15 +61,18 @@ const char **ha_blackhole::bas_ext() const
 int ha_blackhole::open(const char *name, int mode, uint test_if_locked)
 {
   DBUG_ENTER("ha_blackhole::open");
-  thr_lock_init(&thr_lock);
-  thr_lock_data_init(&thr_lock,&lock,NULL);
+
+  if (!(share= get_share(name)))
+    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+
+  thr_lock_data_init(&share->lock, &lock, NULL);
   DBUG_RETURN(0);
 }
 
 int ha_blackhole::close(void)
 {
   DBUG_ENTER("ha_blackhole::close");
-  thr_lock_delete(&thr_lock);
+  free_share(share);
   DBUG_RETURN(0);
 }
 
@@ -136,17 +147,39 @@ int ha_blackhole::external_lock(THD *thd, int lock_type)
 }
 
 
-uint ha_blackhole::lock_count(void) const
-{
-  DBUG_ENTER("ha_blackhole::lock_count");
-  DBUG_RETURN(0);
-}
-
 THR_LOCK_DATA **ha_blackhole::store_lock(THD *thd,
                                          THR_LOCK_DATA **to,
                                          enum thr_lock_type lock_type)
 {
   DBUG_ENTER("ha_blackhole::store_lock");
+  if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK)
+  {
+    /*
+      Here is where we get into the guts of a row level lock.
+      If TL_UNLOCK is set
+      If we are not doing a LOCK TABLE or DISCARD/IMPORT
+      TABLESPACE, then allow multiple writers
+    */
+
+    if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
+         lock_type <= TL_WRITE) && !thd_in_lock_tables(thd)
+        && !thd_tablespace_op(thd))
+      lock_type = TL_WRITE_ALLOW_WRITE;
+
+    /*
+      In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
+      MySQL would use the lock TL_READ_NO_INSERT on t2, and that
+      would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
+      to t2. Convert the lock to a normal read lock to allow
+      concurrent inserts to t2.
+    */
+
+    if (lock_type == TL_READ_NO_INSERT && !thd_in_lock_tables(thd))
+      lock_type = TL_READ;
+
+    lock.type= lock_type;
+  }
+  *to++= &lock;
   DBUG_RETURN(to);
 }
 
@@ -204,6 +237,63 @@ int ha_blackhole::index_last(byte * buf)
   DBUG_RETURN(HA_ERR_END_OF_FILE);
 }
 
+
+static st_blackhole_share *get_share(const char *table_name)
+{
+  st_blackhole_share *share;
+  uint length;
+
+  length= (uint) strlen(table_name);
+  pthread_mutex_lock(&blackhole_mutex);
+    
+  if (!(share= (st_blackhole_share*) hash_search(&blackhole_open_tables,
+                                                 (byte*) table_name, length)))
+  {
+    if (!(share= (st_blackhole_share*) my_malloc(sizeof(st_blackhole_share) +
+                                                 length,
+                                                 MYF(MY_WME | MY_ZEROFILL))))
+      goto error;
+
+    share->table_name_length= length;
+    strmov(share->table_name, table_name);
+    
+    if (my_hash_insert(&blackhole_open_tables, (byte*) share))
+    {
+      my_free((gptr) share, MYF(0));
+      share= NULL;
+      goto error;
+    }
+    
+    thr_lock_init(&share->lock);
+  }
+  share->use_count++;
+  
+error:
+  pthread_mutex_unlock(&blackhole_mutex);
+  return share;
+}
+
+static void free_share(st_blackhole_share *share)
+{
+  pthread_mutex_lock(&blackhole_mutex);
+  if (!--share->use_count)
+    hash_delete(&blackhole_open_tables, (byte*) share);
+  pthread_mutex_unlock(&blackhole_mutex);
+}
+
+static void blackhole_free_key(st_blackhole_share *share)
+{
+  thr_lock_delete(&share->lock);
+  my_free((gptr) share, MYF(0));
+}
+
+static byte* blackhole_get_key(st_blackhole_share *share, uint *length,
+                               my_bool not_used __attribute__((unused)))
+{
+  *length= share->table_name_length;
+  return (byte*) share->table_name;
+}
+
 static int blackhole_init(void *p)
 {
   handlerton *blackhole_hton;
@@ -212,6 +302,20 @@ static int blackhole_init(void *p)
   blackhole_hton->db_type= DB_TYPE_BLACKHOLE_DB;
   blackhole_hton->create= blackhole_create_handler;
   blackhole_hton->flags= HTON_CAN_RECREATE;
+  
+  VOID(pthread_mutex_init(&blackhole_mutex, MY_MUTEX_INIT_FAST));
+  (void) hash_init(&blackhole_open_tables, system_charset_info,32,0,0,
+                   (hash_get_key) blackhole_get_key,
+                   (hash_free_key) blackhole_free_key, 0);
+
+  return 0;
+}
+
+static int blackhole_fini(void *p)
+{
+  hash_free(&blackhole_open_tables);
+  pthread_mutex_destroy(&blackhole_mutex);
+
   return 0;
 }
 
@@ -227,7 +331,7 @@ mysql_declare_plugin(blackhole)
   "/dev/null storage engine (anything you write to it disappears)",
   PLUGIN_LICENSE_GPL,
   blackhole_init, /* Plugin Init */
-  NULL, /* Plugin Deinit */
+  blackhole_fini, /* Plugin Deinit */
   0x0100 /* 1.0 */,
   NULL,                       /* status variables                */
   NULL,                       /* system variables                */

storage/blackhole/ha_blackhole.h

@@ -17,6 +17,17 @@
 #pragma interface			/* gcc class implementation */
 #endif
 
+/*
+  Shared structure for correct LOCK operation
+*/
+struct st_blackhole_share {
+  THR_LOCK lock;
+  uint use_count;
+  uint table_name_length;
+  char table_name[1];
+};
+
+
 /*
   Class definition for the blackhole storage engine
   "Dumbest named feature ever"
@@ -24,7 +35,7 @@
 class ha_blackhole: public handler
 {
   THR_LOCK_DATA lock;      /* MySQL lock */
-  THR_LOCK thr_lock;
+  st_blackhole_share *share;
 
 public:
   ha_blackhole(handlerton *hton, TABLE_SHARE *table_arg);
@@ -76,7 +87,6 @@ public:
   void position(const byte *record);
   int info(uint flag);
   int external_lock(THD *thd, int lock_type);
-  uint lock_count(void) const;
   int create(const char *name, TABLE *table_arg,
              HA_CREATE_INFO *create_info);
   THR_LOCK_DATA **store_lock(THD *thd,

storage/myisam/ha_myisam.cc

@@ -1263,6 +1263,7 @@ int ha_myisam::preload_keys(THD* thd, HA_CHECK_OPT *check_opt)
   ulonglong map;
   TABLE_LIST *table_list= table->pos_in_table_list;
   my_bool ignore_leaves= table_list->ignore_leaves;
+  char buf[ERRMSGSIZE+20];
 
   DBUG_ENTER("ha_myisam::preload_keys");
 
@@ -1294,7 +1295,6 @@ int ha_myisam::preload_keys(THD* thd, HA_CHECK_OPT *check_opt)
       errmsg= "Failed to allocate buffer";
       break;
     default:
-      char buf[ERRMSGSIZE+20];
       my_snprintf(buf, ERRMSGSIZE,
                   "Failed to read from index file (errno: %d)", my_errno);
       errmsg= buf;

storage/myisam/mi_check.c

@@ -335,7 +335,7 @@ int chk_size(MI_CHECK *param, register MI_INFO *info)
   flush_key_blocks(info->s->key_cache,
 		   info->s->kfile, FLUSH_FORCE_WRITE);
 
-  size=my_seek(info->s->kfile,0L,MY_SEEK_END,MYF(0));
+  size= my_seek(info->s->kfile, 0L, MY_SEEK_END, MYF(MY_THREADSAFE));
   if ((skr=(my_off_t) info->state->key_file_length) != size)
   {
     /* Don't give error if file generated by myisampack */
@@ -595,7 +595,8 @@ static int chk_index_down(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
   {
     /* purecov: begin tested */
     /* Give it a chance to fit in the real file size. */
-    my_off_t max_length= my_seek(info->s->kfile, 0L, MY_SEEK_END, MYF(0));
+    my_off_t max_length= my_seek(info->s->kfile, 0L, MY_SEEK_END,
+                                 MYF(MY_THREADSAFE));
     mi_check_print_error(param, "Invalid key block position: %s  "
                          "key block size: %u  file_length: %s",
                          llstr(page, llbuff), keyinfo->block_length,
@@ -4080,10 +4081,10 @@ int test_if_almost_full(MI_INFO *info)
 {
   if (info->s->options & HA_OPTION_COMPRESS_RECORD)
     return 0;
-  return (my_seek(info->s->kfile,0L,MY_SEEK_END,MYF(0))/10*9 >
-	  (my_off_t) (info->s->base.max_key_file_length) ||
-	  my_seek(info->dfile,0L,MY_SEEK_END,MYF(0))/10*9 >
-	  (my_off_t) info->s->base.max_data_file_length);
+  return my_seek(info->s->kfile, 0L, MY_SEEK_END, MYF(MY_THREADSAFE)) / 10 * 9 >
+         (my_off_t) info->s->base.max_key_file_length ||
+         my_seek(info->dfile, 0L, MY_SEEK_END, MYF(0)) / 10 * 9 >
+         (my_off_t) info->s->base.max_data_file_length;
 }
 
 	/* Recreate table with bigger more alloced record-data */

storage/myisam/mi_preload.c

@@ -55,12 +55,17 @@ int mi_preload(MI_INFO *info, ulonglong key_map, my_bool ignore_leaves)
 
   block_length= keyinfo[0].block_length;
 
-  /* Check whether all indexes use the same block size */
-  for (i= 1 ; i < keys ; i++)
+  if (ignore_leaves)
   {
-    if (keyinfo[i].block_length != block_length)
-      DBUG_RETURN(my_errno= HA_ERR_NON_UNIQUE_BLOCK_SIZE);
+    /* Check whether all indexes use the same block size */
+    for (i= 1 ; i < keys ; i++)
+    {
+      if (keyinfo[i].block_length != block_length)
+        DBUG_RETURN(my_errno= HA_ERR_NON_UNIQUE_BLOCK_SIZE);
+    }
   }
+  else
+    block_length= share->key_cache->key_cache_block_size;
 
   length= info->preload_buff_size/block_length * block_length;
   set_if_bigger(length, block_length);