cleanup: mysys_test_invalid_symlink

Remove maria_test_invalid_symlink() and myisam_test_invalid_symlink(),
introduce mysys_test_invalid_symlink(). Other engines might need it too

include/my_sys.h

@@ -548,6 +548,8 @@ extern ulong my_crc_dbug_check;
 typedef int (*Process_option_func)(void *ctx, const char *group_name,
                                    const char *option);
 
+extern int (*mysys_test_invalid_symlink)(const char *filename);
+
 #include <my_alloc.h>
 
 

mysys/my_symlink.c

 /*
    Copyright (c) 2001, 2011, Oracle and/or its affiliates
+   Copyright (c) 2010, 2017, MariaDB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -23,6 +24,14 @@
 #include <sys/stat.h>
 #endif
 
+static int always_valid(const char *filename __attribute__((unused)))
+{
+  return 0;
+}
+
+int (*mysys_test_invalid_symlink)(const char *filename)= always_valid;
+
+
 /*
   Reads the content of a symbolic link
   If the file is not a symbolic link, return the original file name in to.

sql/mysqld.cc

@@ -7267,7 +7267,7 @@ static int mysql_init_variables(void)
   mysql_home[0]= pidfile_name[0]= log_error_file[0]= 0;
 #if defined(HAVE_REALPATH) && !defined(HAVE_valgrind) && !defined(HAVE_BROKEN_REALPATH)
   /*  We can only test for sub paths if my_symlink.c is using realpath */
-  myisam_test_invalid_symlink= test_if_data_home_dir;
+  mysys_test_invalid_symlink= test_if_data_home_dir;
 #endif
   opt_log= opt_slow_log= 0;
   opt_bin_log= opt_bin_log_used= 0;

storage/maria/ha_maria.cc

@@ -3572,10 +3572,6 @@ static int ha_maria_init(void *p)
   maria_pagecache->extra_debug= 1;
   maria_assert_if_crashed_table= debug_assert_if_crashed_table;
 
-#if defined(HAVE_REALPATH) && !defined(HAVE_valgrind) && !defined(HAVE_BROKEN_REALPATH)
-  /*  We can only test for sub paths if my_symlink.c is using realpath */
-  maria_test_invalid_symlink= test_if_data_home_dir;
-#endif
   if (res)
     maria_hton= 0;
 

storage/maria/ma_open.c

@@ -288,7 +288,7 @@ MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
                                                  MARIA_NAME_IEXT,
                                                  MY_UNPACK_FILENAME),MYF(0));
   if (my_is_symlink(org_name) &&
-      (realpath_err || (*maria_test_invalid_symlink)(name_buff)))
+      (realpath_err || mysys_test_invalid_symlink(name_buff)))
   {
     my_errno= HA_WRONG_CREATE_OPTION;
     DBUG_RETURN(0);
@@ -1880,7 +1880,7 @@ int _ma_open_datafile(MARIA_HA *info, MARIA_SHARE *share, const char *org_name,
     if (my_is_symlink(real_data_name))
     {
       if (my_realpath(real_data_name, real_data_name, MYF(0)) ||
-          (*maria_test_invalid_symlink)(real_data_name))
+          mysys_test_invalid_symlink(real_data_name))
       {
         my_errno= HA_WRONG_CREATE_OPTION;
         return 1;

storage/maria/ma_static.c

@@ -106,12 +106,6 @@ uint32 maria_readnext_vec[]=
   SEARCH_BIGGER, SEARCH_SMALLER, SEARCH_SMALLER
 };
 
-static int always_valid(const char *filename __attribute__((unused)))
-{
-  return 0;
-}
-
-int (*maria_test_invalid_symlink)(const char *filename)= always_valid;
 my_bool (*ma_killed)(MARIA_HA *)= ma_killed_standalone;
 
 #ifdef HAVE_PSI_INTERFACE

storage/myisam/mi_delete_table.c

@@ -30,7 +30,7 @@ int mi_delete_table(const char *name)
 #endif
 
   fn_format(from,name,"",MI_NAME_IEXT,MY_UNPACK_FILENAME|MY_APPEND_EXT);
-  if (my_is_symlink(from) && (*myisam_test_invalid_symlink)(from))
+  if (my_is_symlink(from) && mysys_test_invalid_symlink(from))
   {
     /*
       Symlink is pointing to file in data directory.
@@ -45,7 +45,7 @@ int mi_delete_table(const char *name)
       DBUG_RETURN(my_errno);
   }
   fn_format(from,name,"",MI_NAME_DEXT,MY_UNPACK_FILENAME|MY_APPEND_EXT);
-  if (my_is_symlink(from) && (*myisam_test_invalid_symlink)(from))
+  if (my_is_symlink(from) && mysys_test_invalid_symlink(from))
   {
     /*
       Symlink is pointing to file in data directory.

storage/myisam/mi_open.c

@@ -93,7 +93,7 @@ MI_INFO *mi_open(const char *name, int mode, uint open_flags)
   realpath_err= my_realpath(name_buff,
                             fn_format(org_name,name,"",MI_NAME_IEXT,4),MYF(0));
   if (my_is_symlink(org_name) &&
-      (realpath_err || (*myisam_test_invalid_symlink)(name_buff)))
+      (realpath_err || mysys_test_invalid_symlink(name_buff)))
   {
     my_errno= HA_WRONG_CREATE_OPTION;
     DBUG_RETURN (NULL);
@@ -1246,7 +1246,7 @@ int mi_open_datafile(MI_INFO *info, MYISAM_SHARE *share, const char *org_name,
     if (my_is_symlink(real_data_name))
     {
       if (my_realpath(real_data_name, real_data_name, MYF(0)) ||
-          (*myisam_test_invalid_symlink)(real_data_name))
+          mysys_test_invalid_symlink(real_data_name))
       {
         my_errno= HA_WRONG_CREATE_OPTION;
         return 1;

storage/myisam/mi_static.c

@@ -42,14 +42,6 @@ ulong    myisam_data_pointer_size=4;
 ulonglong    myisam_mmap_size= SIZE_T_MAX, myisam_mmap_used= 0;
 my_bool (*mi_killed)(MI_INFO *)= mi_killed_standalone;
 
-static int always_valid(const char *filename __attribute__((unused)))
-{
-  return 0;
-}
-
-int (*myisam_test_invalid_symlink)(const char *filename)= always_valid;
-
-
 /*
   read_vec[] is used for converting between P_READ_KEY.. and SEARCH_
   Position is , == , >= , <= , > , <