Bug #13116225 LIVE DOWNGRADE CRASHES WITH INNODB_PAGE_SIZE=4K

This bug ensures that a live downgrade from an InnoDB 5.6 with WL5756 and
a database created with innodb-page-size=8k or 4k will make a version 5.5
installation politely refuse to start. Instead of crashing or giving some
indication about a corrupted database, it will indicate the page size
difference. 

This patch takes only that part of the Wl5756 patch that is needed to
protect against opening a tablespace that is stamped with a different
page size.

It also contains the change in dict_index_find_on_id_low() just in case
a database with another page size is created by recompiling a pre-WL5756
InnoDB.

7 files changed, 193 insertions, 92 deletions

diff --git a/storage/innobase/dict/dict0dict.c b/storage/innobase/dict/dict0dict.c
index 19f1e145085..9dc3cef229e 100644
--- a/storage/innobase/dict/dict0dict.c
+++ b/storage/innobase/dict/dict0dict.c
@@ -911,6 +911,11 @@ dict_index_find_on_id_low(
 	dict_table_t*	table;
 	dict_index_t*	index;
 
+	/* This can happen if the system tablespace is the wrong page size */
+	if (dict_sys == NULL) {
+		return(NULL);
+	}
+
 	table = UT_LIST_GET_FIRST(dict_sys->table_LRU);
 
 	while (table) {
diff --git a/storage/innobase/fil/fil0fil.c b/storage/innobase/fil/fil0fil.c
index 196f4bd3f42..2e4c6aeeb60 100644
--- a/storage/innobase/fil/fil0fil.c
+++ b/storage/innobase/fil/fil0fil.c
@@ -1803,36 +1803,44 @@ fil_write_flushed_lsn_to_data_files(
 }
 
 /*******************************************************************//**
-Reads the flushed lsn and arch no fields from a data file at database
-startup. */
+Reads the flushed lsn, arch no, and tablespace flag fields from a data
+file at database startup. */
 UNIV_INTERN
 void
-fil_read_flushed_lsn_and_arch_log_no(
-/*=================================*/
+fil_read_first_page(
+/*================*/
 	os_file_t	data_file,		/*!< in: open data file */
 	ibool		one_read_already,	/*!< in: TRUE if min and max
 						parameters below already
 						contain sensible data */
+	ulint*		flags,			/*!< out: tablespace flags */
 #ifdef UNIV_LOG_ARCHIVE
-	ulint*		min_arch_log_no,	/*!< in/out: */
-	ulint*		max_arch_log_no,	/*!< in/out: */
+	ulint*		min_arch_log_no,	/*!< out: min of archived
+						log numbers in data files */
+	ulint*		max_arch_log_no,	/*!< out: max of archived
+						log numbers in data files */
 #endif /* UNIV_LOG_ARCHIVE */
-	ib_uint64_t*	min_flushed_lsn,	/*!< in/out: */
-	ib_uint64_t*	max_flushed_lsn)	/*!< in/out: */
+	ib_uint64_t*	min_flushed_lsn,	/*!< out: min of flushed
+						lsn values in data files */
+	ib_uint64_t*	max_flushed_lsn)	/*!< out: max of flushed
+						lsn values in data files */
 {
 	byte*		buf;
-	byte*		buf2;
+	page_t*		page;
 	ib_uint64_t	flushed_lsn;
 
-	buf2 = ut_malloc(2 * UNIV_PAGE_SIZE);
+	buf = ut_malloc(2 * UNIV_PAGE_SIZE);
 	/* Align the memory for a possible read from a raw device */
-	buf = ut_align(buf2, UNIV_PAGE_SIZE);
+	page = ut_align(buf, UNIV_PAGE_SIZE);
 
-	os_file_read(data_file, buf, 0, 0, UNIV_PAGE_SIZE);
+	os_file_read(data_file, page, 0, 0, UNIV_PAGE_SIZE);
 
-	flushed_lsn = mach_read_from_8(buf + FIL_PAGE_FILE_FLUSH_LSN);
+	*flags = mach_read_from_4(page +
+		FSP_HEADER_OFFSET + FSP_SPACE_FLAGS);
 
-	ut_free(buf2);
+	flushed_lsn = mach_read_from_8(page + FIL_PAGE_FILE_FLUSH_LSN);
+
+	ut_free(buf);
 
 	if (!one_read_already) {
 		*min_flushed_lsn = flushed_lsn;
diff --git a/storage/innobase/fsp/fsp0fsp.c b/storage/innobase/fsp/fsp0fsp.c
index 3f09732a676..2d626405c5c 100644
--- a/storage/innobase/fsp/fsp0fsp.c
+++ b/storage/innobase/fsp/fsp0fsp.c
@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1995, 2010, Innobase Oy. All Rights Reserved.
+Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
 
 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
@@ -11,8 +11,8 @@ 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., 59 Temple
-Place, Suite 330, Boston, MA 02111-1307 USA
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
 
 *****************************************************************************/
 
@@ -50,67 +50,6 @@ Created 11/29/1995 Heikki Tuuri
 #include "dict0mem.h"
 
 
-#define FSP_HEADER_OFFSET	FIL_PAGE_DATA	/* Offset of the space header
-						within a file page */
-
-/* The data structures in files are defined just as byte strings in C */
-typedef	byte	fsp_header_t;
-typedef	byte	xdes_t;
-
-/*			SPACE HEADER
-			============
-
-File space header data structure: this data structure is contained in the
-first page of a space. The space for this header is reserved in every extent
-descriptor page, but used only in the first. */
-
-/*-------------------------------------*/
-#define FSP_SPACE_ID		0	/* space id */
-#define FSP_NOT_USED		4	/* this field contained a value up to
-					which we know that the modifications
-					in the database have been flushed to
-					the file space; not used now */
-#define	FSP_SIZE		8	/* Current size of the space in
-					pages */
-#define	FSP_FREE_LIMIT		12	/* Minimum page number for which the
-					free list has not been initialized:
-					the pages >= this limit are, by
-					definition, free; note that in a
-					single-table tablespace where size
-					< 64 pages, this number is 64, i.e.,
-					we have initialized the space
-					about the first extent, but have not
-					physically allocted those pages to the
-					file */
-#define	FSP_SPACE_FLAGS		16	/* table->flags & ~DICT_TF_COMPACT */
-#define	FSP_FRAG_N_USED		20	/* number of used pages in the
-					FSP_FREE_FRAG list */
-#define	FSP_FREE		24	/* list of free extents */
-#define	FSP_FREE_FRAG		(24 + FLST_BASE_NODE_SIZE)
-					/* list of partially free extents not
-					belonging to any segment */
-#define	FSP_FULL_FRAG		(24 + 2 * FLST_BASE_NODE_SIZE)
-					/* list of full extents not belonging
-					to any segment */
-#define FSP_SEG_ID		(24 + 3 * FLST_BASE_NODE_SIZE)
-					/* 8 bytes which give the first unused
-					segment id */
-#define FSP_SEG_INODES_FULL	(32 + 3 * FLST_BASE_NODE_SIZE)
-					/* list of pages containing segment
-					headers, where all the segment inode
-					slots are reserved */
-#define FSP_SEG_INODES_FREE	(32 + 4 * FLST_BASE_NODE_SIZE)
-					/* list of pages containing segment
-					headers, where not all the segment
-					header slots are reserved */
-/*-------------------------------------*/
-/* File space header size */
-#define	FSP_HEADER_SIZE		(32 + 5 * FLST_BASE_NODE_SIZE)
-
-#define	FSP_FREE_ADD		4	/* this many free extents are added
-					to the free list from above
-					FSP_FREE_LIMIT at a time */
-
 /*			FILE SEGMENT INODE
 			==================
 
diff --git a/storage/innobase/include/fil0fil.h b/storage/innobase/include/fil0fil.h
index 3a6336f1a01..d50b0cb4162 100644
--- a/storage/innobase/include/fil0fil.h
+++ b/storage/innobase/include/fil0fil.h
@@ -328,18 +328,23 @@ Reads the flushed lsn and arch no fields from a data file at database
 startup. */
 UNIV_INTERN
 void
-fil_read_flushed_lsn_and_arch_log_no(
-/*=================================*/
+fil_read_first_page(
+/*================*/
 	os_file_t	data_file,		/*!< in: open data file */
 	ibool		one_read_already,	/*!< in: TRUE if min and max
 						parameters below already
 						contain sensible data */
+	ulint*		flags,			/*!< out: tablespace flags */
 #ifdef UNIV_LOG_ARCHIVE
-	ulint*		min_arch_log_no,	/*!< in/out: */
-	ulint*		max_arch_log_no,	/*!< in/out: */
+	ulint*		min_arch_log_no,	/*!< out: min of archived
+						log numbers in data files */
+	ulint*		max_arch_log_no,	/*!< out: max of archived
+						log numbers in data files */
 #endif /* UNIV_LOG_ARCHIVE */
-	ib_uint64_t*	min_flushed_lsn,	/*!< in/out: */
-	ib_uint64_t*	max_flushed_lsn);	/*!< in/out: */
+	ib_uint64_t*	min_flushed_lsn,	/*!< out: min of flushed
+						lsn values in data files */
+	ib_uint64_t*	max_flushed_lsn);	/*!< out: max of flushed
+						lsn values in data files */
 /*******************************************************************//**
 Increments the count of pending insert buffer page merges, if space is not
 being deleted.
diff --git a/storage/innobase/include/fsp0fsp.h b/storage/innobase/include/fsp0fsp.h
index 7abd3914eda..d5e235aa870 100644
--- a/storage/innobase/include/fsp0fsp.h
+++ b/storage/innobase/include/fsp0fsp.h
@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
+Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
 
 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
@@ -11,8 +11,8 @@ 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., 59 Temple
-Place, Suite 330, Boston, MA 02111-1307 USA
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
 
 *****************************************************************************/
 
@@ -34,6 +34,90 @@ Created 12/18/1995 Heikki Tuuri
 #include "page0types.h"
 #include "fsp0types.h"
 
+/* @defgroup fsp_flags InnoDB Tablespace Flag Constants @{ */
+
+/** Number of flag bits used to indicate the tablespace page size */
+#define FSP_FLAGS_WIDTH_PAGE_SSIZE	4
+/** Zero relative shift position of the PAGE_SSIZE field */
+#define FSP_FLAGS_POS_PAGE_SSIZE	6
+/** Bit mask of the PAGE_SSIZE field */
+#define FSP_FLAGS_MASK_PAGE_SSIZE				\
+		((~(~0 << FSP_FLAGS_WIDTH_PAGE_SSIZE))		\
+		<< FSP_FLAGS_POS_PAGE_SSIZE)
+/** Return the value of the PAGE_SSIZE field */
+#define FSP_FLAGS_GET_PAGE_SSIZE(flags)				\
+		((flags & FSP_FLAGS_MASK_PAGE_SSIZE)		\
+		>> FSP_FLAGS_POS_PAGE_SSIZE)
+
+/* @} */
+
+/* @defgroup Tablespace Header Constants (moved from fsp0fsp.c) @{ */
+
+/** Offset of the space header within a file page */
+#define FSP_HEADER_OFFSET	FIL_PAGE_DATA
+
+/* The data structures in files are defined just as byte strings in C */
+typedef	byte	fsp_header_t;
+typedef	byte	xdes_t;
+
+/*			SPACE HEADER
+			============
+
+File space header data structure: this data structure is contained in the
+first page of a space. The space for this header is reserved in every extent
+descriptor page, but used only in the first. */
+
+/*-------------------------------------*/
+#define FSP_SPACE_ID		0	/* space id */
+#define FSP_NOT_USED		4	/* this field contained a value up to
+					which we know that the modifications
+					in the database have been flushed to
+					the file space; not used now */
+#define	FSP_SIZE		8	/* Current size of the space in
+					pages */
+#define	FSP_FREE_LIMIT		12	/* Minimum page number for which the
+					free list has not been initialized:
+					the pages >= this limit are, by
+					definition, free; note that in a
+					single-table tablespace where size
+					< 64 pages, this number is 64, i.e.,
+					we have initialized the space
+					about the first extent, but have not
+					physically allocted those pages to the
+					file */
+#define	FSP_SPACE_FLAGS		16	/* fsp_space_t.flags, similar to
+					dict_table_t::flags */
+#define	FSP_FRAG_N_USED		20	/* number of used pages in the
+					FSP_FREE_FRAG list */
+#define	FSP_FREE		24	/* list of free extents */
+#define	FSP_FREE_FRAG		(24 + FLST_BASE_NODE_SIZE)
+					/* list of partially free extents not
+					belonging to any segment */
+#define	FSP_FULL_FRAG		(24 + 2 * FLST_BASE_NODE_SIZE)
+					/* list of full extents not belonging
+					to any segment */
+#define FSP_SEG_ID		(24 + 3 * FLST_BASE_NODE_SIZE)
+					/* 8 bytes which give the first unused
+					segment id */
+#define FSP_SEG_INODES_FULL	(32 + 3 * FLST_BASE_NODE_SIZE)
+					/* list of pages containing segment
+					headers, where all the segment inode
+					slots are reserved */
+#define FSP_SEG_INODES_FREE	(32 + 4 * FLST_BASE_NODE_SIZE)
+					/* list of pages containing segment
+					headers, where not all the segment
+					header slots are reserved */
+/*-------------------------------------*/
+/* File space header size */
+#define	FSP_HEADER_SIZE		(32 + 5 * FLST_BASE_NODE_SIZE)
+
+#define	FSP_FREE_ADD		4	/* this many free extents are added
+					to the free list from above
+					FSP_FREE_LIMIT at a time */
+/* @} */
+
+/* @} */
+
 /**********************************************************************//**
 Initializes the file space system. */
 UNIV_INTERN
@@ -352,6 +436,18 @@ fseg_print(
 	mtr_t*		mtr);	/*!< in: mtr */
 #endif /* UNIV_BTR_PRINT */
 
+/********************************************************************//**
+Extract the page size from tablespace flags.
+This feature, storing the page_ssize into the tablespace flags, is added
+to InnoDB 5.6.4.  This is here only to protect against a crash if a newer
+database is opened with this code branch.
+@return	page size of the tablespace in bytes */
+UNIV_INLINE
+ulint
+fsp_flags_get_page_size(
+/*====================*/
+	ulint	flags);	/*!< in: tablespace flags */
+
 #ifndef UNIV_NONINL
 #include "fsp0fsp.ic"
 #endif
diff --git a/storage/innobase/include/fsp0fsp.ic b/storage/innobase/include/fsp0fsp.ic
index 434c370b527..c92111a9d89 100644
--- a/storage/innobase/include/fsp0fsp.ic
+++ b/storage/innobase/include/fsp0fsp.ic
@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
+Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
 
 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
@@ -11,8 +11,8 @@ 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., 59 Temple
-Place, Suite 330, Boston, MA 02111-1307 USA
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
 
 *****************************************************************************/
 
@@ -43,3 +43,31 @@ fsp_descr_page(
 
 	return(UNIV_UNLIKELY((page_no & (zip_size - 1)) == FSP_XDES_OFFSET));
 }
+/********************************************************************//**
+Extract the page size from tablespace flags.
+This feature, storing the page_ssize into the tablespace flags, is added
+to InnoDB 5.6.4.  This is here only to protect against a crash if a newer
+database is opened with this code branch.
+@return	page size of the tablespace in bytes */
+UNIV_INLINE
+ulint
+fsp_flags_get_page_size(
+/*====================*/
+	ulint	flags)	/*!< in: tablespace flags */
+{
+	ulint	page_size = 0;
+	ulint	ssize = FSP_FLAGS_GET_PAGE_SSIZE(flags);
+
+	/* Convert from a 'log2 minus 9' to a page size in bytes. */
+	if (UNIV_UNLIKELY(ssize)) {
+		page_size = (512 << ssize);
+
+		ut_ad(page_size <= UNIV_PAGE_SIZE);
+	} else {
+		/* If the page size was not stored, then it is the
+		original 16k. */
+		page_size = UNIV_PAGE_SIZE;
+	}
+
+	return(page_size);
+}
diff --git a/storage/innobase/srv/srv0start.c b/storage/innobase/srv/srv0start.c
index cf11e75b8e0..edc655e93b9 100644
--- a/storage/innobase/srv/srv0start.c
+++ b/storage/innobase/srv/srv0start.c
@@ -733,6 +733,7 @@ open_or_create_data_files(
 	ibool	one_created	= FALSE;
 	ulint	size;
 	ulint	size_high;
+	ulint	flags;
 	ulint	rounded_size_pages;
 	char	name[10000];
 
@@ -914,12 +915,31 @@ open_or_create_data_files(
 				return(DB_ERROR);
 			}
 skip_size_check:
-			fil_read_flushed_lsn_and_arch_log_no(
-				files[i], one_opened,
+			fil_read_first_page(
+				files[i], one_opened, &flags,
 #ifdef UNIV_LOG_ARCHIVE
 				min_arch_log_no, max_arch_log_no,
 #endif /* UNIV_LOG_ARCHIVE */
 				min_flushed_lsn, max_flushed_lsn);
+
+			if (UNIV_PAGE_SIZE
+			    != fsp_flags_get_page_size(flags)) {
+
+				ut_print_timestamp(stderr);
+				fprintf(stderr,
+					" InnoDB: Error: data file %s"
+					" uses page size %lu,\n",
+					name,
+					fsp_flags_get_page_size(flags));
+				ut_print_timestamp(stderr);
+				fprintf(stderr,
+					" InnoDB: but the only supported"
+					" page size in this release is=%lu\n",
+					(ulong) UNIV_PAGE_SIZE);
+
+				return(DB_ERROR);
+			}
+
 			one_opened = TRUE;
 		} else {
 			/* We created the data file and now write it full of