Re: [PATCH 18/25] btrfs: Use readahead_batch_length

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

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;