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diff --git a/storage/innobase/include/fil0fil.inl b/storage/innobase/include/fil0fil.inl
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+++ b/storage/innobase/include/fil0fil.inl
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+/*****************************************************************************
+
+Copyright (c) 2015, 2019, MariaDB Corporation.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file include/fil0fil.ic
+The low-level file system support functions
+
+Created 31/03/2015 Jan Lindström
+*******************************************************/
+
+#ifndef fil0fil_ic
+#define fil0fil_ic
+
+/*******************************************************************//**
+Return page type name */
+UNIV_INLINE
+const char*
+fil_get_page_type_name(
+/*===================*/
+	ulint	page_type)	/*!< in: FIL_PAGE_TYPE */
+{
+	switch(page_type) {
+	case FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED:
+		return "PAGE_COMPRESSED_ENRYPTED";
+	case FIL_PAGE_PAGE_COMPRESSED:
+		return "PAGE_COMPRESSED";
+	case FIL_PAGE_TYPE_INSTANT:
+	case FIL_PAGE_INDEX:
+		return "INDEX";
+	case FIL_PAGE_RTREE:
+		return "RTREE";
+	case FIL_PAGE_UNDO_LOG:
+		return "UNDO LOG";
+	case FIL_PAGE_INODE:
+		return "INODE";
+	case FIL_PAGE_IBUF_FREE_LIST:
+		return "IBUF_FREE_LIST";
+	case FIL_PAGE_TYPE_ALLOCATED:
+		return "ALLOCATED";
+	case FIL_PAGE_IBUF_BITMAP:
+		return "IBUF_BITMAP";
+	case FIL_PAGE_TYPE_SYS:
+		return "SYS";
+	case FIL_PAGE_TYPE_TRX_SYS:
+		return "TRX_SYS";
+	case FIL_PAGE_TYPE_FSP_HDR:
+		return "FSP_HDR";
+	case FIL_PAGE_TYPE_XDES:
+		return "XDES";
+	case FIL_PAGE_TYPE_BLOB:
+		return "BLOB";
+	case FIL_PAGE_TYPE_ZBLOB:
+		return "ZBLOB";
+	case FIL_PAGE_TYPE_ZBLOB2:
+		return "ZBLOB2";
+	case FIL_PAGE_TYPE_UNKNOWN:
+		return "OLD UNKNOWN PAGE TYPE";
+	default:
+		return "PAGE TYPE CORRUPTED";
+	}
+}
+
+#ifdef UNIV_DEBUG
+/** Validate page type.
+@param[in]	space	Tablespace object
+@param[in]	page	page to validate
+@return true if valid, false if not */
+UNIV_INLINE
+bool
+fil_page_type_validate(
+	fil_space_t*	space,
+	const byte*	page)
+{
+	ulint page_type = mach_read_from_2(page + FIL_PAGE_TYPE);
+
+	if ((page_type & 1U << FIL_PAGE_COMPRESS_FCRC32_MARKER)
+	    && space->full_crc32()
+	    && space->is_compressed()) {
+		return true;
+	}
+
+	/* Validate page type */
+	if (!((page_type == FIL_PAGE_PAGE_COMPRESSED ||
+		page_type == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED ||
+		page_type == FIL_PAGE_INDEX ||
+		page_type == FIL_PAGE_TYPE_INSTANT ||
+		page_type == FIL_PAGE_RTREE ||
+		page_type == FIL_PAGE_UNDO_LOG ||
+		page_type == FIL_PAGE_INODE ||
+		page_type == FIL_PAGE_IBUF_FREE_LIST ||
+		page_type == FIL_PAGE_TYPE_ALLOCATED ||
+		page_type == FIL_PAGE_IBUF_BITMAP ||
+		page_type == FIL_PAGE_TYPE_SYS ||
+		page_type == FIL_PAGE_TYPE_TRX_SYS ||
+		page_type == FIL_PAGE_TYPE_FSP_HDR ||
+		page_type == FIL_PAGE_TYPE_XDES ||
+		page_type == FIL_PAGE_TYPE_BLOB ||
+		page_type == FIL_PAGE_TYPE_ZBLOB ||
+		page_type == FIL_PAGE_TYPE_ZBLOB2 ||
+		page_type == FIL_PAGE_TYPE_UNKNOWN))) {
+
+		ulint space_id = mach_read_from_4(
+			page + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
+
+		ulint offset = mach_read_from_4(page + FIL_PAGE_OFFSET);
+
+		ulint key_version = mach_read_from_4(
+			page + FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION);
+
+		if (space && space->full_crc32()) {
+			key_version = mach_read_from_4(
+				page + FIL_PAGE_FCRC32_KEY_VERSION);
+		}
+
+		/* Dump out the page info */
+		ib::fatal() << "Page " << space_id << ":" << offset
+			<< " name " << (space ? space->name : "???")
+			<< " page_type " << page_type
+			<< " key_version " << key_version
+			<< " lsn " << mach_read_from_8(page + FIL_PAGE_LSN)
+			<< " compressed_len " << mach_read_from_2(page + FIL_PAGE_DATA);
+		return false;
+	}
+
+	return true;
+}
+#endif /* UNIV_DEBUG */
+
+#endif /* fil0fil_ic */