Fixed bug #17823: 'arc' directories inside database directories.

Server created "arc" directories inside database directories and
maintained there useless copies of .frm files.

Creation and renaming procedures of those copies as well as
creation of "arc" directories has been discontinued.
Removal procedure has been kept untouched to be able to
cleanup existent database directories by the DROP DATABASE
query. Also view renaming procedure has been updated to remove
these directories.


sql/parse_file.cc:
  Fixed bug #17823: 'arc' directories inside database directories.
  View/table creation and renaming procedures maintained
  backup copies of .frm files. Those copies are unused yet,
  so this feature was incomplete and unnecessary.
  
  1. Unwanted code has been hidden by FRM_ARCHIVE ifdefs
  (the FRM_ARCHIVE macro is not defined).
  
  2. Renaming procedure has been modified to remove obsolete
  "arc" directories.
sql/parse_file.h:
  Fixed bug #17823: 'arc' directories inside database directories.
  The "thd" parameter has been added to the rename_in_schema_file()
  function.
sql/sql_db.cc:
  Fixed bug #17823: 'arc' directories inside database directories.
  Scope of the mysql_rm_arc_files() function has been changed to
  global for use from the parse_file.cc file.
sql/sql_view.cc:
  Fixed bug #17823: 'arc' directories inside database directories.
  Added the "thd" argument to rename_in_schema_file() calls.

sql/parse_file.cc

@@ -21,6 +21,9 @@
 #include <my_sys.h>
 #include <my_dir.h>
 
+/* from sql_db.cc */
+extern long mysql_rm_arc_files(THD *thd, MY_DIR *dirp, const char *org_path);
+
 
 /*
   write string with escaping
@@ -265,8 +268,9 @@ sql_create_definition_file(const LEX_STRING *dir, const LEX_STRING *file_name,
     DBUG_RETURN(TRUE);
   }
 
-  // archive copies management
   path[path_end]='\0';
+#ifdef FRM_ARCHIVE
+  // archive copies management: disabled unused feature (see bug #17823).
   if (!access(path, F_OK))
   {
     if (old_version != ULONGLONG_MAX && max_versions != 0)
@@ -313,6 +317,7 @@ sql_create_definition_file(const LEX_STRING *dir, const LEX_STRING *file_name,
       }
     }
   }
+#endif//FRM_ARCHIVE
 
   {
     // rename temporary file
@@ -337,6 +342,7 @@ err_w_file:
 
   SYNOPSIS
     rename_in_schema_file
+    thd               thread handler
     schema            name of given schema           
     old_name          original file name
     new_name          new file name
@@ -348,7 +354,8 @@ err_w_file:
     1 - Error (only if renaming of frm failed)
 
 */
-my_bool rename_in_schema_file(const char *schema, const char *old_name, 
+my_bool rename_in_schema_file(THD *thd,
+                              const char *schema, const char *old_name, 
                               const char *new_name, ulonglong revision, 
                               uint num_view_backups)
 {
@@ -365,10 +372,11 @@ my_bool rename_in_schema_file(const char *schema, const char *old_name,
   if (my_rename(old_path, new_path, MYF(MY_WME)))
     return 1;
 
-  /* check if arc_dir exists */
+  /* check if arc_dir exists: disabled unused feature (see bug #17823). */
   strxnmov(arc_path, FN_REFLEN, mysql_data_home, "/", schema, "/arc", NullS);
   (void) unpack_filename(arc_path, arc_path);
   
+#ifdef FRM_ARCHIVE
   if (revision > 0 && !access(arc_path, F_OK))
   {
     ulonglong limit= ((revision > num_view_backups) ?
@@ -384,6 +392,16 @@ my_bool rename_in_schema_file(const char *schema, const char *old_name,
       my_rename(old_path, new_path, MYF(0));
     }
   }
+#else//FRM_ARCHIVE
+  { // remove obsolete 'arc' directory and files if any
+    MY_DIR *new_dirp;
+    if ((new_dirp = my_dir(arc_path, MYF(MY_DONT_SORT))))
+    {
+      DBUG_PRINT("my",("Archive subdir found: %s", arc_path));
+      (void) mysql_rm_arc_files(thd, new_dirp, arc_path);
+    }
+  }
+#endif//FRM_ARCHIVE
   return 0;
 }
 

sql/parse_file.h

@@ -82,8 +82,9 @@ my_bool
 sql_create_definition_file(const LEX_STRING *dir, const  LEX_STRING *file_name,
 			   const LEX_STRING *type,
 			   gptr base, File_option *parameters, uint versions);
-my_bool rename_in_schema_file(const char *schema, const char *old_name, 
-                              const char *new_name, ulonglong revision, 
+my_bool rename_in_schema_file(THD *thd,
+                              const char *schema, const char *old_name,
+                              const char *new_name, ulonglong revision,
                               uint num_view_backups);
 
 class File_parser: public Sql_alloc

sql/sql_db.cc

@@ -35,7 +35,7 @@ static long mysql_rm_known_files(THD *thd, MY_DIR *dirp,
 				 const char *db, const char *path, uint level, 
                                  TABLE_LIST **dropped_tables);
          
-static long mysql_rm_arc_files(THD *thd, MY_DIR *dirp, const char *org_path);
+long mysql_rm_arc_files(THD *thd, MY_DIR *dirp, const char *org_path);
 static my_bool rm_dir_w_symlink(const char *org_path, my_bool send_error);
 /* Database options hash */
 static HASH dboptions;
@@ -906,7 +906,11 @@ static long mysql_rm_known_files(THD *thd, MY_DIR *dirp, const char *db,
     else if (file->name[0] == 'a' && file->name[1] == 'r' &&
              file->name[2] == 'c' && file->name[3] == '\0')
     {
-      /* .frm archive */
+      /* .frm archive:
+        Those archives are obsolete, but following code should
+        exist to remove existent "arc" directories.
+        See #ifdef FRM_ARCHIVE directives for obsolete code.
+      */
       char newpath[FN_REFLEN];
       MY_DIR *new_dirp;
       strxmov(newpath, org_path, "/", "arc", NullS);
@@ -1061,9 +1065,13 @@ static my_bool rm_dir_w_symlink(const char *org_path, my_bool send_error)
   RETURN
     > 0 number of removed files
     -1  error
+
+  NOTE
+    A support of "arc" directories is obsolete, however this
+    function should exist to remove existent "arc" directories.
+    See #ifdef FRM_ARCHIVE directives for obsolete code.
 */
-static long mysql_rm_arc_files(THD *thd, MY_DIR *dirp,
-				 const char *org_path)
+long mysql_rm_arc_files(THD *thd, MY_DIR *dirp, const char *org_path)
 {
   long deleted= 0;
   ulong found_other_files= 0;
@@ -1105,6 +1113,7 @@ static long mysql_rm_arc_files(THD *thd, MY_DIR *dirp,
     {
       goto err;
     }
+    deleted++;
   }
   if (thd->killed)
     goto err;

sql/sql_view.cc

@@ -1858,7 +1858,7 @@ mysql_rename_view(THD *thd,
       goto err;
 
     /* rename view and it's backups */
-    if (rename_in_schema_file(view->db, view->table_name, new_name, 
+    if (rename_in_schema_file(thd, view->db, view->table_name, new_name, 
                               view_def.revision - 1, num_view_backups))
       goto err;
 
@@ -1877,7 +1877,7 @@ mysql_rename_view(THD *thd,
                                    num_view_backups)) 
     {
       /* restore renamed view in case of error */
-      rename_in_schema_file(view->db, new_name, view->table_name, 
+      rename_in_schema_file(thd, view->db, new_name, view->table_name, 
                             view_def.revision - 1, num_view_backups);
       goto err;
     }