Index: linux-2.6.20-rc1/include/linux/page-flags.h
===================================================================
--- linux-2.6.20-rc1.orig/include/linux/page-flags.h 2006-12-14 04:14:23.000000000 +0300
+++ linux-2.6.20-rc1/include/linux/page-flags.h 2006-12-22 20:05:31.000000000 +0300
@@ -90,6 +90,7 @@
#define PG_reclaim 17 /* To be reclaimed asap */
#define PG_nosave_free 18 /* Used for system suspend/resume */
#define PG_buddy 19 /* Page is free, on buddy lists */
+#define PG_booked 20 /* Has blocks reserved on-disk */
#if (BITS_PER_LONG > 32)
@@ -230,6 +231,10 @@ static inline void SetPageUptodate(struc
#define SetPageMappedToDisk(page) set_bit(PG_mappedtodisk, &(page)->flags)
#define ClearPageMappedToDisk(page) clear_bit(PG_mappedtodisk, &(page)->flags)
+#define PageBooked(page) test_bit(PG_booked, &(page)->flags)
+#define SetPageBooked(page) set_bit(PG_booked, &(page)->flags)
+#define ClearPageBooked(page) clear_bit(PG_booked, &(page)->flags)
+
#define PageReclaim(page) test_bit(PG_reclaim, &(page)->flags)
#define SetPageReclaim(page) set_bit(PG_reclaim, &(page)->flags)
#define ClearPageReclaim(page) clear_bit(PG_reclaim, &(page)->flags)
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