Fix a problem in crash recovery of .ibd files on Windows if the user used lower_case_table_names=0 or 2; the directory scan in crash recovery forgot to put all paths to lower case, so that the tablespace name would be consistent with the internal data dictionary of InnoDB; remember that InnoDB puts internally all database names and table names to lower case on Windows, regardless of the value of lower_case_table_names
Add fault tolerance in the scan of .ibd files at a crash recovery; formerly a single failure of readdir_get_next caused the rest of the directory to be skipped
At the shutdown, write the latest lsn only to the first pages of the ibdata files of the system tablespace, NOT to the .ibd files; writing to tens of thousands .ibd files can take minutes
We accidentally checked if the DIRECTORY is of type OS_FILE_TYPE_UNKNOWN; our intention was to check if the FILE is that; best to remove the check altogether, as in crash recovery it is safest to try to open also files whose type is unknown
os0file.c:
Fix a bug: in Windows, os_file_readdir_next_file() returned OS_FILE_TYPE_UNKNOWN as the type of a regular file; this did not break mysqld, but did break ibbackup on Windows
Fix a race condition that could cause the assertion space->n_pending_flushes == 0 to fail in fil0fil.c, in fil_space_free(), in DROP TABLE or in ALTER TABLE
Fix InnoDB critical bug #7496; we scan the InnoDB data dictionary also at a normal mysqld startup, and create the spaces, so that we know the mapping space id -> .ibd file name; fix an infinite loop if DISCARD TABLESPACE coincides with INSERT or some other table operation; fix a potential crash if DISCARD TABLESPACE coincides with a cascaded FOREIGN KEY operation in the same table; do not allow DISCARD TABLESPACE of a referenced table if FOREIGN_KEY_CHECKS=1
Print more warnings to the .err log if ALTER TABLE ... IMPORT TABLESPACE fails for some reason
os0file.c:
Do not call exit(1) if os_file_delete() fails; remove unused parameter from
handle_error_no_exit()
fil0fil.c:
Allow DROP TABLE even if the .ibd file for the table does not exist
Fix bug #5137: if innodb_file_per_table was specified, CREATE TEMPORARY TABLE ... TYPE=InnoDB said that cannot find path specified, and made mysqld to exit(1)
Remove the use of mem_realloc in fil0fil.c; mem_realloc() was broken and the patch to remove its definition will propagate from the 4.0 tree; crash recovery with innodb_file_per_table has to be tested after this patch, not tested yet
