On Thu, Dec 17, 2020 at 12:12:46PM +0000, Matthew Wilcox wrote:> ehh ... probably an off-by-one. Does subtracting 1 from contig_end fix it?> I'll spool up a test VM shortly and try it out.Yes, this fixed it:- u64 contig_end = contig_start + readahead_batch_length(rac);+ u64 contig_end = contig_start + readahead_batch_length(rac) - 1;