MDEV-29692 Assertion `(writeptr + (i * size)) != local_frame' failed upon IMPORT TABLESPACE

fil_iterate(): Allocation bitmap pages are never encrypted.

Reviewed by: Thirunarayanan Balathandayuthapani

mysql-test/suite/encryption/r/import_4k.result

+set @save_limit = @@GLOBAL.innodb_limit_optimistic_insert_debug;
+set global innodb_limit_optimistic_insert_debug=3;
+create table t1 (a INT PRIMARY KEY) engine=InnoDB ENCRYPTED=YES;
+insert into t1 select * from seq_1_to_6000;
+flush table t1 for export;
+unlock tables;
+alter table t1 discard tablespace;
+alter table t1 import tablespace;
+set global innodb_limit_optimistic_insert_debug=@save_limit;
+drop table t1;

mysql-test/suite/encryption/t/import_4k.opt

+--innodb-page-size=4k

mysql-test/suite/encryption/t/import_4k.test

+--source include/have_innodb.inc
+--source include/have_sequence.inc
+--source include/have_example_key_management_plugin.inc
+--source include/have_debug.inc
+
+set @save_limit = @@GLOBAL.innodb_limit_optimistic_insert_debug;
+set global innodb_limit_optimistic_insert_debug=3;
+create table t1 (a INT PRIMARY KEY) engine=InnoDB ENCRYPTED=YES;
+insert into t1 select * from seq_1_to_6000;
+flush table t1 for export;
+--let $datadir= `select @@datadir`
+--copy_file $datadir/test/t1.ibd $datadir/t1.ibd
+--copy_file $datadir/test/t1.cfg $datadir/t1.cfg
+unlock tables;
+alter table t1 discard tablespace;
+--move_file $datadir/t1.ibd $datadir/test/t1.ibd
+--move_file $datadir/t1.cfg $datadir/test/t1.cfg
+alter table t1 import tablespace;
+set global innodb_limit_optimistic_insert_debug=@save_limit;
+drop table t1;

storage/innobase/row/row0import.cc

@@ -3971,14 +3971,15 @@ static dberr_t fil_iterate(
 					src + FIL_PAGE_SPACE_ID);
 			}
 
+			const uint16_t type = fil_page_get_type(src);
 			page_compressed =
 				(full_crc32
 				 && fil_space_t::is_compressed(
 					callback.get_space_flags())
 				 && buf_page_is_compressed(
 					src, callback.get_space_flags()))
-				|| (fil_page_is_compressed_encrypted(src)
-				    || fil_page_is_compressed(src));
+				|| type == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED
+				|| type == FIL_PAGE_PAGE_COMPRESSED;
 
 			if (page_compressed && block->page.zip.data) {
 				goto page_corrupted;
@@ -3997,6 +3998,7 @@ static dberr_t fil_iterate(
 					block->page.zip.data = src;
 					frame_changed = true;
 				} else if (!page_compressed
+					   && type != FIL_PAGE_TYPE_XDES
 					   && !block->page.zip.data) {
 					block->frame = src;
 					frame_changed = true;