MDEV-8770: Incorrect error message when importing page compressed tablespace

Added decompression and after page update recompression support for
import.

mysql-test/suite/encryption/r/innodb-discard-import.result

+call mtr.add_suppression("InnoDB: Table .* tablespace is set as discarded");
+SET GLOBAL innodb_file_format = `Barracuda`;
+SET GLOBAL innodb_file_per_table = ON;
+SET GLOBAL innodb_compression_algorithm = 1;
+create table t1(c1 bigint not null, b char(200))  engine=innodb encrypted=yes encryption_key_id=4;
+show warnings;
+Level	Code	Message
+create table t2(c1 bigint not null, b char(200))  engine=innodb page_compressed=1 encrypted=yes encryption_key_id=4;
+show warnings;
+Level	Code	Message
+create table t3(c1 bigint not null, b char(200))  engine=innodb row_format=compressed encrypted=yes encryption_key_id=4;
+show warnings;
+Level	Code	Message
+create table t4(c1 bigint not null, b char(200))  engine=innodb page_compressed=1;
+show warnings;
+Level	Code	Message
+create procedure innodb_insert_proc (repeat_count int)
+begin
+declare current_num int;
+set current_num = 0;
+while current_num < repeat_count do
+insert into t1 values(current_num, repeat('foobar',30));
+insert into t2 values(current_num, repeat('barfoo',30));
+insert into t3 values(current_num, repeat('tmpres',30));
+insert into t4 values(current_num, repeat('mysql',30));
+set current_num = current_num + 1;
+end while;
+end//
+commit;
+set autocommit=0;
+call innodb_insert_proc(2000);
+commit;
+set autocommit=1;
+select count(*) from t1;
+count(*)
+2000
+select count(*) from t2;
+count(*)
+2000
+select count(*) from t3;
+count(*)
+2000
+select count(*) from t4;
+count(*)
+2000
+FLUSH TABLE t1,t2,t3,t4 FOR EXPORT;
+# List before copying files
+t1.cfg
+t1.frm
+t1.ibd
+t2.cfg
+t2.frm
+t2.ibd
+t3.cfg
+t3.frm
+t3.ibd
+t4.cfg
+t4.frm
+t4.ibd
+UNLOCK TABLES;
+# tables should be either encrypted and/or compressed
+# t1 yes on expecting NOT FOUND
+NOT FOUND /foobar/ in t1.ibd
+# t2 yes on expecting NOT FOUND
+NOT FOUND /barfoo/ in t2.ibd
+# t3 yes on expecting NOT FOUND
+NOT FOUND /tmpres/ in t3.ibd
+# t4 yes on expecting NOT FOUND
+NOT FOUND /mysql/ in t4.ibd
+ALTER TABLE t1 DISCARD TABLESPACE;
+ALTER TABLE t2 DISCARD TABLESPACE;
+ALTER TABLE t3 DISCARD TABLESPACE;
+ALTER TABLE t4 DISCARD TABLESPACE;
+SET GLOBAL innodb_file_format = `Barracuda`;
+SET GLOBAL innodb_file_per_table = ON;
+SET GLOBAL innodb_compression_algorithm = 1;
+# List after t1 DISCARD
+t1.frm
+t2.frm
+t3.frm
+t4.frm
+ALTER TABLE t1 IMPORT TABLESPACE;
+Warnings:
+Warning	1814	Tablespace has been discarded for table 't1'
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c1` bigint(20) NOT NULL,
+  `b` char(200) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 `encrypted`=yes `encryption_key_id`=4
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+2000
+ALTER TABLE t2 IMPORT TABLESPACE;
+Warnings:
+Warning	1814	Tablespace has been discarded for table 't2'
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `c1` bigint(20) NOT NULL,
+  `b` char(200) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 `page_compressed`=1 `encrypted`=yes `encryption_key_id`=4
+SELECT COUNT(*) FROM t2;
+COUNT(*)
+2000
+ALTER TABLE t3 IMPORT TABLESPACE;
+Warnings:
+Warning	1814	Tablespace has been discarded for table 't3'
+SHOW CREATE TABLE t3;
+Table	Create Table
+t3	CREATE TABLE `t3` (
+  `c1` bigint(20) NOT NULL,
+  `b` char(200) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=COMPRESSED `encrypted`=yes `encryption_key_id`=4
+SELECT COUNT(*) FROM t3;
+COUNT(*)
+2000
+ALTER TABLE t4 IMPORT TABLESPACE;
+Warnings:
+Warning	1814	Tablespace has been discarded for table 't4'
+SHOW CREATE TABLE t4;
+Table	Create Table
+t4	CREATE TABLE `t4` (
+  `c1` bigint(20) NOT NULL,
+  `b` char(200) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 `page_compressed`=1
+SELECT COUNT(*) FROM t4;
+COUNT(*)
+2000
+flush data to disk
+SET GLOBAL innodb_file_format = `Barracuda`;
+SET GLOBAL innodb_file_per_table = ON;
+SET GLOBAL innodb_compression_algorithm = 1;
+# tables should be still either encrypted and/or compressed
+# t1 yes on expecting NOT FOUND
+NOT FOUND /foobar/ in t1.ibd
+# t2 yes on expecting NOT FOUND
+NOT FOUND /barfoo/ in t2.ibd
+# t3 yes on expecting NOT FOUND
+NOT FOUND /tmpres/ in t3.ibd
+# t4 yes on expecting NOT FOUND
+NOT FOUND /mysql/ in t4.ibd
+DROP PROCEDURE innodb_insert_proc;
+DROP TABLE t1,t2,t3,t4;

mysql-test/suite/encryption/t/innodb-discard-import.test

+-- source include/have_innodb.inc
+-- source include/have_file_key_management_plugin.inc
+# embedded does not support restart
+-- source include/not_embedded.inc
+-- source include/not_valgrind.inc
+# Avoid CrashReporter popup on Mac
+-- source include/not_crashrep.inc
+
+#
+# MDEV-8770: Incorrect error message when importing page compressed tablespace
+#
+
+call mtr.add_suppression("InnoDB: Table .* tablespace is set as discarded");
+
+--disable_query_log
+let $innodb_file_format_orig = `SELECT @@innodb_file_format`;
+let $innodb_file_per_table_orig = `SELECT @@innodb_file_per_table`;
+let $innodb_compression_algo = `SELECT @@innodb_compression_algorithm`;
+--enable_query_log
+
+SET GLOBAL innodb_file_format = `Barracuda`;
+SET GLOBAL innodb_file_per_table = ON;
+SET GLOBAL innodb_compression_algorithm = 1;
+
+--let $MYSQLD_TMPDIR = `SELECT @@tmpdir`
+--let $MYSQLD_DATADIR = `SELECT @@datadir`
+--let SEARCH_RANGE = 10000000
+--let t1_IBD = $MYSQLD_DATADIR/test/t1.ibd
+--let t2_IBD = $MYSQLD_DATADIR/test/t2.ibd
+--let t3_IBD = $MYSQLD_DATADIR/test/t3.ibd
+--let t4_IBD = $MYSQLD_DATADIR/test/t4.ibd
+
+create table t1(c1 bigint not null, b char(200))  engine=innodb encrypted=yes encryption_key_id=4;
+show warnings;
+create table t2(c1 bigint not null, b char(200))  engine=innodb page_compressed=1 encrypted=yes encryption_key_id=4;
+show warnings;
+create table t3(c1 bigint not null, b char(200))  engine=innodb row_format=compressed encrypted=yes encryption_key_id=4;
+show warnings;
+create table t4(c1 bigint not null, b char(200))  engine=innodb page_compressed=1;
+show warnings;
+
+delimiter //;
+create procedure innodb_insert_proc (repeat_count int)
+begin
+  declare current_num int;
+  set current_num = 0;
+  while current_num < repeat_count do
+    insert into t1 values(current_num, repeat('foobar',30));
+    insert into t2 values(current_num, repeat('barfoo',30));
+    insert into t3 values(current_num, repeat('tmpres',30));
+    insert into t4 values(current_num, repeat('mysql',30));
+   set current_num = current_num + 1;
+  end while;
+end//
+delimiter ;//
+commit;
+
+set autocommit=0;
+call innodb_insert_proc(2000);
+commit;
+set autocommit=1;
+
+select count(*) from t1;
+select count(*) from t2;
+select count(*) from t3;
+select count(*) from t4;
+
+FLUSH TABLE t1,t2,t3,t4 FOR EXPORT;
+--echo # List before copying files
+--list_files $MYSQLD_DATADIR/test
+--copy_file $MYSQLD_DATADIR/test/t1.cfg $MYSQLD_TMPDIR/t1.cfg
+--copy_file $MYSQLD_DATADIR/test/t1.ibd $MYSQLD_TMPDIR/t1.ibd
+--copy_file $MYSQLD_DATADIR/test/t2.cfg $MYSQLD_TMPDIR/t2.cfg
+--copy_file $MYSQLD_DATADIR/test/t2.ibd $MYSQLD_TMPDIR/t2.ibd
+--copy_file $MYSQLD_DATADIR/test/t3.cfg $MYSQLD_TMPDIR/t3.cfg
+--copy_file $MYSQLD_DATADIR/test/t3.ibd $MYSQLD_TMPDIR/t3.ibd
+--copy_file $MYSQLD_DATADIR/test/t4.cfg $MYSQLD_TMPDIR/t4.cfg
+--copy_file $MYSQLD_DATADIR/test/t4.ibd $MYSQLD_TMPDIR/t4.ibd
+UNLOCK TABLES;
+
+--echo # tables should be either encrypted and/or compressed
+--let SEARCH_PATTERN=foobar
+--echo # t1 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t1_IBD
+-- source include/search_pattern_in_file.inc
+--let SEARCH_PATTERN=barfoo
+--echo # t2 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t2_IBD
+-- source include/search_pattern_in_file.inc
+--let SEARCH_PATTERN=tmpres
+--echo # t3 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t3_IBD
+-- source include/search_pattern_in_file.inc
+--let SEARCH_PATTERN=mysql
+--echo # t4 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t4_IBD
+-- source include/search_pattern_in_file.inc
+
+ALTER TABLE t1 DISCARD TABLESPACE;
+ALTER TABLE t2 DISCARD TABLESPACE;
+ALTER TABLE t3 DISCARD TABLESPACE;
+ALTER TABLE t4 DISCARD TABLESPACE;
+
+--source include/restart_mysqld.inc
+
+SET GLOBAL innodb_file_format = `Barracuda`;
+SET GLOBAL innodb_file_per_table = ON;
+SET GLOBAL innodb_compression_algorithm = 1;
+
+--echo # List after t1 DISCARD
+--list_files $MYSQLD_DATADIR/test
+--copy_file $MYSQLD_TMPDIR/t1.cfg $MYSQLD_DATADIR/test/t1.cfg
+--copy_file $MYSQLD_TMPDIR/t1.ibd $MYSQLD_DATADIR/test/t1.ibd
+--copy_file $MYSQLD_TMPDIR/t2.cfg $MYSQLD_DATADIR/test/t2.cfg
+--copy_file $MYSQLD_TMPDIR/t2.ibd $MYSQLD_DATADIR/test/t2.ibd
+--copy_file $MYSQLD_TMPDIR/t3.cfg $MYSQLD_DATADIR/test/t3.cfg
+--copy_file $MYSQLD_TMPDIR/t3.ibd $MYSQLD_DATADIR/test/t3.ibd
+--copy_file $MYSQLD_TMPDIR/t4.cfg $MYSQLD_DATADIR/test/t4.cfg
+--copy_file $MYSQLD_TMPDIR/t4.ibd $MYSQLD_DATADIR/test/t4.ibd
+
+ALTER TABLE t1 IMPORT TABLESPACE;
+SHOW CREATE TABLE t1;
+SELECT COUNT(*) FROM t1;
+ALTER TABLE t2 IMPORT TABLESPACE;
+SHOW CREATE TABLE t2;
+SELECT COUNT(*) FROM t2;
+ALTER TABLE t3 IMPORT TABLESPACE;
+SHOW CREATE TABLE t3;
+SELECT COUNT(*) FROM t3;
+ALTER TABLE t4 IMPORT TABLESPACE;
+SHOW CREATE TABLE t4;
+SELECT COUNT(*) FROM t4;
+
+--echo flush data to disk
+--source include/restart_mysqld.inc
+
+SET GLOBAL innodb_file_format = `Barracuda`;
+SET GLOBAL innodb_file_per_table = ON;
+SET GLOBAL innodb_compression_algorithm = 1;
+
+--echo # tables should be still either encrypted and/or compressed
+--let SEARCH_PATTERN=foobar
+--echo # t1 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t1_IBD
+-- source include/search_pattern_in_file.inc
+--let SEARCH_PATTERN=barfoo
+--echo # t2 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t2_IBD
+-- source include/search_pattern_in_file.inc
+--let SEARCH_PATTERN=tmpres
+--echo # t3 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t3_IBD
+-- source include/search_pattern_in_file.inc
+--let SEARCH_PATTERN=mysql
+--echo # t4 yes on expecting NOT FOUND
+-- let SEARCH_FILE=$t4_IBD
+-- source include/search_pattern_in_file.inc
+
+DROP PROCEDURE innodb_insert_proc;
+DROP TABLE t1,t2,t3,t4;
+
+# reset system
+--disable_query_log
+EVAL SET GLOBAL innodb_file_per_table = $innodb_file_per_table_orig;
+EVAL SET GLOBAL innodb_file_format = $innodb_file_format_orig;
+EVAL SET GLOBAL innodb_compression_algorithm = $innodb_compression_algo;
+--enable_query_log

storage/innobase/buf/buf0buf.cc

@@ -5892,6 +5892,7 @@ buf_page_init_for_backup_restore(
 Reserve unused slot from temporary memory array and allocate necessary
 temporary memory if not yet allocated.
 @return reserved slot */
+UNIV_INTERN
 buf_tmp_buffer_t*
 buf_pool_reserve_tmp_slot(
 /*======================*/

storage/innobase/fil/fil0crypt.cc

@@ -613,6 +613,9 @@ fil_encrypt_buf(
 		memcpy(dst_frame + page_size - FIL_PAGE_DATA_END,
 			src_frame + page_size - FIL_PAGE_DATA_END,
 			FIL_PAGE_DATA_END);
+	} else {
+		/* Clean up rest of buffer */
+		memset(dst_frame+header_len+srclen, 0, page_size - (header_len+srclen));
 	}
 
 	/* handle post encryption checksum */

storage/innobase/fil/fil0fil.cc

@@ -6444,17 +6444,24 @@ fil_iterate(
 		bool		decrypted = false;
 
 		for (ulint i = 0; i < n_pages_read; ++i) {
-			ulint size = iter.page_size;
+			ulint 	size = iter.page_size;
 			dberr_t	err = DB_SUCCESS;
+			byte*	src = (readptr + (i * size));
+			byte*	dst = (io_buffer + (i * size));
+
+			ulint page_type = mach_read_from_2(src+FIL_PAGE_TYPE);
+
+			bool page_compressed = (page_type == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED ||
+				page_type == FIL_PAGE_PAGE_COMPRESSED);
 
 			/* If tablespace is encrypted, we need to decrypt
 			the page. */
 			if (encrypted) {
 				decrypted = fil_space_decrypt(
 							iter.crypt_data,
-							io_buffer + i * size, //dst
+							dst, //dst
 							iter.page_size,
-							readptr + i * size, // src
+							src, // src
 							&err); // src
 
 				if (err != DB_SUCCESS) {
@@ -6465,12 +6472,18 @@ fil_iterate(
 					updated = true;
 				} else {
 					/* TODO: remove unnecessary memcpy's */
-					memcpy(io_buffer + i * size, readptr + i * size, size);
+					memcpy(dst, src, size);
 				}
 			}
 
-			buf_block_set_file_page(block, space_id, page_no++);
+			/* If the original page is page_compressed, we need
+			to decompress page before we can update it. */
+			if (page_compressed) {
+				fil_decompress_page(NULL, dst, size, NULL);
+				updated = true;
+			}
 
+			buf_block_set_file_page(block, space_id, page_no++);
 
 			if ((err = callback(page_off, block)) != DB_SUCCESS) {
 
@@ -6484,12 +6497,28 @@ fil_iterate(
 			buf_block_set_state(block, BUF_BLOCK_NOT_USED);
 			buf_block_set_state(block, BUF_BLOCK_READY_FOR_USE);
 
+			src =  (io_buffer + (i * size));
+
+			if (page_compressed) {
+				ulint len = 0;
+				byte* res = fil_compress_page(space_id,
+					src,
+					NULL,
+					size,
+					fil_space_get_page_compression_level(space_id),
+					fil_space_get_block_size(space_id, offset, size),
+					encrypted,
+					&len,
+					NULL);
+
+				updated = true;
+			}
+
 			/* If tablespace is encrypted, encrypt page before we
 			write it back. Note that we should not encrypt the
 			buffer that is in buffer pool. */
 			if (decrypted && encrypted) {
-				unsigned char *src = io_buffer + (i * size);
-				unsigned char *dst = writeptr + (i * size);
+				unsigned char *dest = (writeptr + (i * size));
 				ulint space = mach_read_from_4(
 					src + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
 				ulint offset = mach_read_from_4(src + FIL_PAGE_OFFSET);
@@ -6502,12 +6531,14 @@ fil_iterate(
 							lsn,
 							src,
 							iter.page_size == UNIV_PAGE_SIZE ? 0 : iter.page_size,
-							dst);
+							dest);
 
 				if (tmp == src) {
 					/* TODO: remove unnecessary memcpy's */
-					memcpy(writeptr, src, size);
+					memcpy(dest, src, size);
 				}
+
+				updated = true;
 			}
 
 			page_off += iter.page_size;

storage/innobase/fil/fil0pagecompress.cc

@@ -111,11 +111,23 @@ fil_compress_page(
 	/* Cache to avoid change during function execution */
 	ulint comp_method = innodb_compression_algorithm;
 	ulint orig_page_type;
+	bool allocated=false;
 
 	if (encrypted) {
 		header_len += FIL_PAGE_COMPRESSION_METHOD_SIZE;
 	}
 
+	if (!out_buf) {
+		allocated = true;
+		out_buf = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
+#ifdef HAVE_LZO
+		if (comp_method == PAGE_LZO_ALGORITHM) {
+			lzo_mem = static_cast<byte *>(ut_malloc(LZO1X_1_15_MEM_COMPRESS));
+			memset(lzo_mem, 0, LZO1X_1_15_MEM_COMPRESS);
+		}
+#endif
+	}
+
 	ut_ad(buf);
 	ut_ad(out_buf);
 	ut_ad(len);
@@ -124,6 +136,10 @@ fil_compress_page(
 	/* read original page type */
 	orig_page_type = mach_read_from_2(buf + FIL_PAGE_TYPE);
 
+	fil_system_enter();
+	fil_space_t* space = fil_space_get_by_id(space_id);
+	fil_system_exit();
+
 	/* Let's not compress file space header or
 	extent descriptor */
 	if (orig_page_type == 0 ||
@@ -131,12 +147,9 @@ fil_compress_page(
 	    orig_page_type == FIL_PAGE_TYPE_XDES ||
 		orig_page_type == FIL_PAGE_PAGE_COMPRESSED) {
 		*out_len = len;
-		return (buf);
-	}
 
-	fil_system_enter();
-	fil_space_t* space = fil_space_get_by_id(space_id);
-	fil_system_exit();
+		goto err_exit;
+	}
 
 	/* If no compression level was provided to this table, use system
 	default level */
@@ -174,7 +187,7 @@ fil_compress_page(
 #endif
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 #endif /* HAVE_LZ4 */
@@ -190,9 +203,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, err, write_size);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 
 		break;
@@ -218,9 +232,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, err, out_pos);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 
 		write_size = out_pos;
@@ -248,9 +263,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, err, write_size);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 	}
@@ -270,9 +286,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, (int)cstatus, write_size);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 	}
@@ -293,7 +310,7 @@ fil_compress_page(
 
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 
@@ -339,15 +356,17 @@ fil_compress_page(
 		byte *comp_page;
 		byte *uncomp_page;
 
-		comp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE*3));
-		uncomp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE*3));
+		comp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
+		uncomp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
 		memcpy(comp_page, out_buf, UNIV_PAGE_SIZE);
 
 		fil_decompress_page(uncomp_page, comp_page, len, NULL);
+
 		if(buf_page_is_corrupted(false, uncomp_page, 0)) {
 			buf_page_print(uncomp_page, 0, BUF_PAGE_PRINT_NO_CRASH);
 			ut_error;
 		}
+
 		ut_free(comp_page);
 		ut_free(uncomp_page);
 	}
@@ -366,6 +385,8 @@ fil_compress_page(
 		size_t tmp = write_size;
 
 		write_size =  (size_t)ut_uint64_align_up((ib_uint64_t)write_size, block_size);
+		/* Clean up the end of buffer */
+		memset(out_buf+tmp, 0, write_size - tmp);
 #ifdef UNIV_DEBUG
 		ut_a(write_size > 0 && ((write_size % block_size) == 0));
 		ut_a(write_size >= tmp);
@@ -384,12 +405,30 @@ fil_compress_page(
 	/* If we do not persistently trim rest of page, we need to write it
 	all */
 	if (!srv_use_trim) {
+		memset(out_buf+write_size,0,len-write_size);
 		write_size = len;
 	}
 
 	*out_len = write_size;
 
-	return(out_buf);
+	if (allocated) {
+		/* TODO: reduce number of memcpy's */
+		memcpy(buf, out_buf, len);
+	} else {
+		return(out_buf);
+	}
+
+err_exit:
+	if (allocated) {
+		ut_free(out_buf);
+#ifdef HAVE_LZO
+		if (comp_method == PAGE_LZO_ALGORITHM) {
+			ut_free(lzo_mem);
+		}
+#endif
+	}
+
+	return (buf);
 
 }
 
@@ -432,7 +471,8 @@ fil_decompress_page(
 
 	// If no buffer was given, we need to allocate temporal buffer
 	if (page_buf == NULL) {
-		in_buf = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE*3));
+		in_buf = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
+		memset(in_buf, 0, UNIV_PAGE_SIZE);
 	} else {
 		in_buf = page_buf;
 	}

storage/innobase/include/fsp0pagecompress.ic

@@ -21,7 +21,8 @@ this program; if not, write to the Free Software Foundation, Inc.,
 Implementation for helper functions for extracting/storing page
 compression and atomic writes information to file space.
 
-Created 11/12/2013 Jan Lindström jan.lindstrom@skysql.com
+Created 11/12/2013 Jan Lindström jan.lindstrom@mariadb.com
+
 ***********************************************************************/
 
 /********************************************************************//**
@@ -100,7 +101,7 @@ fil_page_is_compressed_encrypted(
 /*******************************************************************//**
 Returns the page compression level of the space, or 0 if the space
 is not compressed. The tablespace must be cached in the memory cache.
-@return	page compression level, ULINT_UNDEFINED if space not found */
+@return	page compression level, 0 if space not found */
 UNIV_INLINE
 ulint
 fil_space_get_page_compression_level(
@@ -116,7 +117,7 @@ fil_space_get_page_compression_level(
 		return(fsp_flags_get_page_compression_level(flags));
 	}
 
-	return(flags);
+	return(0);
 }
 
 /*******************************************************************//**
@@ -138,7 +139,7 @@ fil_space_is_page_compressed(
 		return(fsp_flags_is_page_compressed(flags));
 	}
 
-	return(flags);
+	return(0);
 }
 
 #endif /* UNIV_INNOCHECKSUM */

storage/xtradb/buf/buf0buf.cc

@@ -6070,6 +6070,7 @@ buf_pool_mutex_exit(
 Reserve unused slot from temporary memory array and allocate necessary
 temporary memory if not yet allocated.
 @return reserved slot */
+UNIV_INTERN
 buf_tmp_buffer_t*
 buf_pool_reserve_tmp_slot(
 /*======================*/

storage/xtradb/fil/fil0crypt.cc

@@ -613,6 +613,9 @@ fil_encrypt_buf(
 		memcpy(dst_frame + page_size - FIL_PAGE_DATA_END,
 			src_frame + page_size - FIL_PAGE_DATA_END,
 			FIL_PAGE_DATA_END);
+	} else {
+		/* Clean up rest of buffer */
+		memset(dst_frame+header_len+srclen, 0, page_size - (header_len+srclen));
 	}
 
 	/* handle post encryption checksum */

storage/xtradb/fil/fil0fil.cc

@@ -6501,17 +6501,24 @@ fil_iterate(
 		bool		decrypted = false;
 
 		for (ulint i = 0; i < n_pages_read; ++i) {
-			ulint size = iter.page_size;
+			ulint 	size = iter.page_size;
 			dberr_t	err = DB_SUCCESS;
+			byte*	src = (readptr + (i * size));
+			byte*	dst = (io_buffer + (i * size));
+
+			ulint page_type = mach_read_from_2(src+FIL_PAGE_TYPE);
+
+			bool page_compressed = (page_type == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED ||
+				page_type == FIL_PAGE_PAGE_COMPRESSED);
 
 			/* If tablespace is encrypted, we need to decrypt
 			the page. */
 			if (encrypted) {
 				decrypted = fil_space_decrypt(
 							iter.crypt_data,
-							io_buffer + i * size, //dst
+							dst, //dst
 							iter.page_size,
-							readptr + i * size, // src
+							src, // src
 							&err); // src
 
 				if (err != DB_SUCCESS) {
@@ -6522,12 +6529,18 @@ fil_iterate(
 					updated = true;
 				} else {
 					/* TODO: remove unnecessary memcpy's */
-					memcpy(io_buffer + i * size, readptr + i * size, size);
+					memcpy(dst, src, size);
 				}
 			}
 
-			buf_block_set_file_page(block, space_id, page_no++);
+			/* If the original page is page_compressed, we need
+			to decompress page before we can update it. */
+			if (page_compressed) {
+				fil_decompress_page(NULL, dst, size, NULL);
+				updated = true;
+			}
 
+			buf_block_set_file_page(block, space_id, page_no++);
 
 			if ((err = callback(page_off, block)) != DB_SUCCESS) {
 
@@ -6541,12 +6554,28 @@ fil_iterate(
 			buf_block_set_state(block, BUF_BLOCK_NOT_USED);
 			buf_block_set_state(block, BUF_BLOCK_READY_FOR_USE);
 
+			src =  (io_buffer + (i * size));
+
+			if (page_compressed) {
+				ulint len = 0;
+				byte* res = fil_compress_page(space_id,
+					src,
+					NULL,
+					size,
+					fil_space_get_page_compression_level(space_id),
+					fil_space_get_block_size(space_id, offset, size),
+					encrypted,
+					&len,
+					NULL);
+
+				updated = true;
+			}
+
 			/* If tablespace is encrypted, encrypt page before we
 			write it back. Note that we should not encrypt the
 			buffer that is in buffer pool. */
 			if (decrypted && encrypted) {
-				unsigned char *src = io_buffer + (i * size);
-				unsigned char *dst = writeptr + (i * size);
+				unsigned char *dest = (writeptr + (i * size));
 				ulint space = mach_read_from_4(
 					src + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
 				ulint offset = mach_read_from_4(src + FIL_PAGE_OFFSET);
@@ -6559,12 +6588,14 @@ fil_iterate(
 							lsn,
 							src,
 							iter.page_size == UNIV_PAGE_SIZE ? 0 : iter.page_size,
-							dst);
+							dest);
 
 				if (tmp == src) {
 					/* TODO: remove unnecessary memcpy's */
-					memcpy(writeptr, src, size);
+					memcpy(dest, src, size);
 				}
+
+				updated = true;
 			}
 
 			page_off += iter.page_size;

storage/xtradb/fil/fil0pagecompress.cc

@@ -111,11 +111,23 @@ fil_compress_page(
 	/* Cache to avoid change during function execution */
 	ulint comp_method = innodb_compression_algorithm;
 	ulint orig_page_type;
+	bool allocated=false;
 
 	if (encrypted) {
 		header_len += FIL_PAGE_COMPRESSION_METHOD_SIZE;
 	}
 
+	if (!out_buf) {
+		allocated = true;
+		out_buf = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
+#ifdef HAVE_LZO
+		if (comp_method == PAGE_LZO_ALGORITHM) {
+			lzo_mem = static_cast<byte *>(ut_malloc(LZO1X_1_15_MEM_COMPRESS));
+			memset(lzo_mem, 0, LZO1X_1_15_MEM_COMPRESS);
+		}
+#endif
+	}
+
 	ut_ad(buf);
 	ut_ad(out_buf);
 	ut_ad(len);
@@ -124,6 +136,10 @@ fil_compress_page(
 	/* read original page type */
 	orig_page_type = mach_read_from_2(buf + FIL_PAGE_TYPE);
 
+	fil_system_enter();
+	fil_space_t* space = fil_space_get_by_id(space_id);
+	fil_system_exit();
+
 	/* Let's not compress file space header or
 	extent descriptor */
 	if (orig_page_type == 0 ||
@@ -131,12 +147,9 @@ fil_compress_page(
 	    orig_page_type == FIL_PAGE_TYPE_XDES ||
 		orig_page_type == FIL_PAGE_PAGE_COMPRESSED) {
 		*out_len = len;
-		return (buf);
-	}
 
-	fil_system_enter();
-	fil_space_t* space = fil_space_get_by_id(space_id);
-	fil_system_exit();
+		goto err_exit;
+	}
 
 	/* If no compression level was provided to this table, use system
 	default level */
@@ -174,7 +187,7 @@ fil_compress_page(
 #endif
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 #endif /* HAVE_LZ4 */
@@ -190,9 +203,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, err, write_size);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 
 		break;
@@ -218,9 +232,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, err, out_pos);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 
 		write_size = out_pos;
@@ -248,9 +263,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, err, write_size);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 	}
@@ -270,9 +286,10 @@ fil_compress_page(
 					space_id, fil_space_name(space), len, (int)cstatus, write_size);
 				space->printed_compression_failure = true;
 			}
+
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 	}
@@ -293,7 +310,7 @@ fil_compress_page(
 
 			srv_stats.pages_page_compression_error.inc();
 			*out_len = len;
-			return (buf);
+			goto err_exit;
 		}
 		break;
 
@@ -339,15 +356,17 @@ fil_compress_page(
 		byte *comp_page;
 		byte *uncomp_page;
 
-		comp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE*3));
-		uncomp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE*3));
+		comp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
+		uncomp_page = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
 		memcpy(comp_page, out_buf, UNIV_PAGE_SIZE);
 
 		fil_decompress_page(uncomp_page, comp_page, len, NULL);
+
 		if(buf_page_is_corrupted(false, uncomp_page, 0)) {
 			buf_page_print(uncomp_page, 0, BUF_PAGE_PRINT_NO_CRASH);
 			ut_error;
 		}
+
 		ut_free(comp_page);
 		ut_free(uncomp_page);
 	}
@@ -363,10 +382,10 @@ fil_compress_page(
 
 	/* Actual write needs to be alligned on block size */
 	if (write_size % block_size) {
-#ifdef UNIV_DEBUG
 		size_t tmp = write_size;
-#endif
 		write_size =  (size_t)ut_uint64_align_up((ib_uint64_t)write_size, block_size);
+		/* Clean up the end of buffer */
+		memset(out_buf+tmp, 0, write_size - tmp);
 #ifdef UNIV_DEBUG
 		ut_a(write_size > 0 && ((write_size % block_size) == 0));
 		ut_a(write_size >= tmp);
@@ -385,12 +404,30 @@ fil_compress_page(
 	/* If we do not persistently trim rest of page, we need to write it
 	all */
 	if (!srv_use_trim) {
+		memset(out_buf+write_size,0,len-write_size);
 		write_size = len;
 	}
 
 	*out_len = write_size;
 
-	return(out_buf);
+	if (allocated) {
+		/* TODO: reduce number of memcpy's */
+		memcpy(buf, out_buf, len);
+	} else {
+		return(out_buf);
+	}
+
+err_exit:
+	if (allocated) {
+		ut_free(out_buf);
+#ifdef HAVE_LZO
+		if (comp_method == PAGE_LZO_ALGORITHM) {
+			ut_free(lzo_mem);
+		}
+#endif
+	}
+
+	return (buf);
 
 }
 
@@ -433,7 +470,8 @@ fil_decompress_page(
 
 	// If no buffer was given, we need to allocate temporal buffer
 	if (page_buf == NULL) {
-		in_buf = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE*3));
+		in_buf = static_cast<byte *>(ut_malloc(UNIV_PAGE_SIZE));
+		memset(in_buf, 0, UNIV_PAGE_SIZE);
 	} else {
 		in_buf = page_buf;
 	}

storage/xtradb/include/fsp0pagecompress.ic

@@ -21,7 +21,8 @@ this program; if not, write to the Free Software Foundation, Inc.,
 Implementation for helper functions for extracting/storing page
 compression and atomic writes information to file space.
 
-Created 11/12/2013 Jan Lindström jan.lindstrom@skysql.com
+Created 11/12/2013 Jan Lindström jan.lindstrom@mariadb.com
+
 ***********************************************************************/
 
 /********************************************************************//**
@@ -100,7 +101,7 @@ fil_page_is_compressed_encrypted(
 /*******************************************************************//**
 Returns the page compression level of the space, or 0 if the space
 is not compressed. The tablespace must be cached in the memory cache.
-@return	page compression level, ULINT_UNDEFINED if space not found */
+@return	page compression level, 0 if space not found */
 UNIV_INLINE
 ulint
 fil_space_get_page_compression_level(
@@ -116,7 +117,7 @@ fil_space_get_page_compression_level(
 		return(fsp_flags_get_page_compression_level(flags));
 	}
 
-	return(flags);
+	return(0);
 }
 
 /*******************************************************************//**
@@ -138,7 +139,7 @@ fil_space_is_page_compressed(
 		return(fsp_flags_is_page_compressed(flags));
 	}
 
-	return(flags);
+	return(0);
 }
 
 #endif /* UNIV_INNOCHECKSUM */