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

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On 12/17/20 5:42 AM, Matthew Wilcox wrote:
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;


Yes, confirmed on my end, too.

thanks,
--
John Hubbard
NVIDIA




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