Added HA_ERR_DISK_FULL handler error

Original code by Zardosht Kasheff

sql/handler.cc:
  Added HA_ERR_DISK_FULL and ENOSPC (for handler that uses normal errno).
  This sets 'fatal_error' to ensure that the error is logged to err file (which hopefully is on another disk...)

include/my_base.h

@@ -446,7 +446,8 @@ enum ha_base_keytype {
 #define HA_ERR_ROW_NOT_VISIBLE    177
 #define HA_ERR_TOO_MANY_CONCURRENT_TRXS 178 /*Too many active concurrent transactions */
 #define HA_ERR_ABORTED_BY_USER    179
-#define HA_ERR_LAST               179    /* Copy of last error nr */
+#define HA_ERR_DISK_FULL          180
+#define HA_ERR_LAST               180    /* Copy of last error nr */
 
 /* Number of different errors */
 #define HA_ERR_ERRORS            (HA_ERR_LAST - HA_ERR_FIRST + 1)

mysys/my_handler_errors.h

@@ -64,5 +64,6 @@ static const char *handler_error_messages[]=
   "Read page with wrong checksum",
   "Too many active concurrent transactions",
   "Row is not visible by the current transaction",
-  "Operation was interrupted by end user (probably kill command?)"
+  "Operation was interrupted by end user (probably kill command?)",
+  "Disk full"
 };

sql/handler.cc

@@ -345,6 +345,7 @@ int ha_init_errors(void)
   SETMSG(HA_ERR_AUTOINC_READ_FAILED,    ER(ER_AUTOINC_READ_FAILED));
   SETMSG(HA_ERR_AUTOINC_ERANGE,         ER(ER_WARN_DATA_OUT_OF_RANGE));
   SETMSG(HA_ERR_TOO_MANY_CONCURRENT_TRXS, ER(ER_TOO_MANY_CONCURRENT_TRXS));
+  SETMSG(HA_ERR_DISK_FULL,              ER(ER_DISK_FULL));
 
   /* Register the error messages for use with my_error(). */
   return my_error_register(errmsgs, HA_ERR_FIRST, HA_ERR_LAST);
@@ -2759,6 +2760,11 @@ void handler::print_error(int error, myf errflag)
   case ENOENT:
     textno=ER_FILE_NOT_FOUND;
     break;
+  case ENOSPC:
+  case HA_ERR_DISK_FULL:
+    textno= ER_DISK_FULL;
+    SET_FATAL_ERROR;                            // Ensure error is logged
+    break;
   case HA_ERR_KEY_NOT_FOUND:
   case HA_ERR_NO_ACTIVE_RECORD:
   case HA_ERR_END_OF_FILE: