MDEV-12112/MDEV-12114: Relax strict_innodb, strict_none

Starting with commit 6b698715
the encrypted page checksum is only computed with crc32.
Encrypted data pages that were written earlier can contain
other checksums, but new ones will only contain crc32.

Because of this, it does not make sense to implement strict
checks of innodb_checksum_algorithm for other than strict_crc32.

fil_space_verify_crypt_checksum(): Treat strict_innodb as innodb
and strict_none as none. That is, allow a match from any of the
algorithms none, innodb, crc32. (This is how it worked before the
second MDEV-12112 fix.)

Thanks to Thirunarayanan Balathandayuthapani for pointing this out.

storage/innobase/fil/fil0crypt.cc

@@ -2588,10 +2588,8 @@ bool fil_space_verify_crypt_checksum(const byte* page, ulint zip_size)
 
 	/* If stored checksum matches one of the calculated checksums
 	page is not corrupted. */
-	srv_checksum_algorithm_t algorithm = srv_checksum_algorithm_t(
-		srv_checksum_algorithm);
 
-	switch (algorithm) {
+	switch (srv_checksum_algorithm_t(srv_checksum_algorithm)) {
 	case SRV_CHECKSUM_ALGORITHM_STRICT_CRC32:
 		if (zip_size) {
 			return checksum == page_zip_calc_checksum(
@@ -2599,32 +2597,29 @@ bool fil_space_verify_crypt_checksum(const byte* page, ulint zip_size)
 		}
 
 		return checksum == buf_calc_page_crc32(page);
-	case SRV_CHECKSUM_ALGORITHM_STRICT_INNODB:
-		if (zip_size) {
-			return checksum == page_zip_calc_checksum(
-				page, zip_size, SRV_CHECKSUM_ALGORITHM_INNODB);
-		}
-		return checksum == buf_calc_page_new_checksum(page);
 	case SRV_CHECKSUM_ALGORITHM_STRICT_NONE:
-		return checksum == BUF_NO_CHECKSUM_MAGIC;
+		/* Starting with MariaDB 10.1.25, 10.2.7, 10.3.1,
+		due to MDEV-12114, fil_crypt_calculate_checksum()
+		is only using CRC32 for the encrypted pages.
+		Due to this, we must treat "strict_none" as "none". */
 	case SRV_CHECKSUM_ALGORITHM_NONE:
 		return true;
+	case SRV_CHECKSUM_ALGORITHM_STRICT_INNODB:
+		/* Starting with MariaDB 10.1.25, 10.2.7, 10.3.1,
+		due to MDEV-12114, fil_crypt_calculate_checksum()
+		is only using CRC32 for the encrypted pages.
+		Due to this, we must treat "strict_innodb" as "innodb". */
 	case SRV_CHECKSUM_ALGORITHM_INNODB:
 	case SRV_CHECKSUM_ALGORITHM_CRC32:
 		if (checksum == BUF_NO_CHECKSUM_MAGIC) {
 			return true;
 		}
 		if (zip_size) {
-			if (checksum == page_zip_calc_checksum(
-				    page, zip_size, algorithm)) {
-				return true;
-			}
-
-			algorithm = algorithm == SRV_CHECKSUM_ALGORITHM_INNODB
-				? SRV_CHECKSUM_ALGORITHM_CRC32
-				: SRV_CHECKSUM_ALGORITHM_INNODB;
 			return checksum == page_zip_calc_checksum(
-				page, zip_size, algorithm);
+				page, zip_size, SRV_CHECKSUM_ALGORITHM_CRC32)
+				|| checksum == page_zip_calc_checksum(
+					page, zip_size,
+					SRV_CHECKSUM_ALGORITHM_INNODB);
 		}
 
 		return checksum == buf_calc_page_crc32(page)

storage/xtradb/fil/fil0crypt.cc

@@ -2588,10 +2588,8 @@ bool fil_space_verify_crypt_checksum(const byte* page, ulint zip_size)
 
 	/* If stored checksum matches one of the calculated checksums
 	page is not corrupted. */
-	srv_checksum_algorithm_t algorithm = srv_checksum_algorithm_t(
-		srv_checksum_algorithm);
 
-	switch (algorithm) {
+	switch (srv_checksum_algorithm_t(srv_checksum_algorithm)) {
 	case SRV_CHECKSUM_ALGORITHM_STRICT_CRC32:
 		if (zip_size) {
 			return checksum == page_zip_calc_checksum(
@@ -2599,32 +2597,29 @@ bool fil_space_verify_crypt_checksum(const byte* page, ulint zip_size)
 		}
 
 		return checksum == buf_calc_page_crc32(page);
-	case SRV_CHECKSUM_ALGORITHM_STRICT_INNODB:
-		if (zip_size) {
-			return checksum == page_zip_calc_checksum(
-				page, zip_size, SRV_CHECKSUM_ALGORITHM_INNODB);
-		}
-		return checksum == buf_calc_page_new_checksum(page);
 	case SRV_CHECKSUM_ALGORITHM_STRICT_NONE:
-		return checksum == BUF_NO_CHECKSUM_MAGIC;
+		/* Starting with MariaDB 10.1.25, 10.2.7, 10.3.1,
+		due to MDEV-12114, fil_crypt_calculate_checksum()
+		is only using CRC32 for the encrypted pages.
+		Due to this, we must treat "strict_none" as "none". */
 	case SRV_CHECKSUM_ALGORITHM_NONE:
 		return true;
+	case SRV_CHECKSUM_ALGORITHM_STRICT_INNODB:
+		/* Starting with MariaDB 10.1.25, 10.2.7, 10.3.1,
+		due to MDEV-12114, fil_crypt_calculate_checksum()
+		is only using CRC32 for the encrypted pages.
+		Due to this, we must treat "strict_innodb" as "innodb". */
 	case SRV_CHECKSUM_ALGORITHM_INNODB:
 	case SRV_CHECKSUM_ALGORITHM_CRC32:
 		if (checksum == BUF_NO_CHECKSUM_MAGIC) {
 			return true;
 		}
 		if (zip_size) {
-			if (checksum == page_zip_calc_checksum(
-				    page, zip_size, algorithm)) {
-				return true;
-			}
-
-			algorithm = algorithm == SRV_CHECKSUM_ALGORITHM_INNODB
-				? SRV_CHECKSUM_ALGORITHM_CRC32
-				: SRV_CHECKSUM_ALGORITHM_INNODB;
 			return checksum == page_zip_calc_checksum(
-				page, zip_size, algorithm);
+				page, zip_size, SRV_CHECKSUM_ALGORITHM_CRC32)
+				|| checksum == page_zip_calc_checksum(
+					page, zip_size,
+					SRV_CHECKSUM_ALGORITHM_INNODB);
 		}
 
 		return checksum == buf_calc_page_crc32(page)