On Tue, Aug 17, 2021 at 01:11:43PM +0300, Nikolay Borisov wrote:

quoted

+/*
+ * Extra info for subpapge bitmap.
+ *
+ * For subpage we pack all uptodate/error/dirty/writeback/ordered
+ * bitmaps into one larger bitmap.
+ *
+ * This structure records how they are organized in such bitmap:
+ *
+ * /- uptodate_offset	/- error_offset	/- dirty_offset
+ * |			|		|
+ * v			v		v
+ * |u|u|u|u|........|u|u|e|e|.......|e|e| ...	|o|o|

nit: the 'e' that the dirty offset is pointing to should be a 'd', I'm
sure David can fix this while merging.

I don't see any 'e' under the dirty offset arrow, there's just 'o' and
the arrow points to end of |e|e| and continues with ...