branches/zip: Allow a build with UNIV_PAGE_SIZE set to 4096.

TRX_RSEG_N_SLOTS: Make the definition dependent of UNIV_PAGE_SIZE.

FSP_EXTENT_SIZE: Define as 1 megabyte, as assumed by the code elsewhere.

fseg_create_general(): Add a debug assertion against page overflow.

fsp/fsp0fsp.c

@@ -2172,6 +2172,8 @@ fseg_create_general(
 	ulint		i;
 
 	ut_ad(mtr);
+	ut_ad(byte_offset + FSEG_HEADER_SIZE
+	      <= UNIV_PAGE_SIZE - FIL_PAGE_DATA_END);
 
 	latch = fil_space_get_latch(space, &zip_size);
 

include/fsp0fsp.h

@@ -24,8 +24,8 @@ fseg_alloc_free_page): */
 #define	FSP_DOWN	((byte)112)	/* alphabetically downwards */
 #define	FSP_NO_DIR	((byte)113)	/* no order */
 
-/* File space extent size in pages */
-#define	FSP_EXTENT_SIZE		64
+/* File space extent size (one megabyte) in pages */
+#define	FSP_EXTENT_SIZE		(1 << (20 - UNIV_PAGE_SIZE_SHIFT))
 
 /* On a page of any file segment, data may be put starting from this offset: */
 #define FSEG_PAGE_DATA		FIL_PAGE_DATA

include/trx0rseg.h

@@ -116,7 +116,7 @@ trx_rseg_create(
 
 
 /* Number of undo log slots in a rollback segment file copy */
-#define TRX_RSEG_N_SLOTS	1024
+#define TRX_RSEG_N_SLOTS	(UNIV_PAGE_SIZE / 16)
 
 /* Maximum number of transactions supported by a single rollback segment */
 #define TRX_RSEG_MAX_N_TRXS	(TRX_RSEG_N_SLOTS / 2)