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Date:   Tue, 16 Nov 2021 17:52:55 +0000 (GMT)
From:   Mark Hills <>
To:     Andreas Dilger <>
cc:     Ext4 Developers List <>
Subject: Re: Maildir quickly hitting max htree

On Sat, 13 Nov 2021, Andreas Dilger wrote:

> >>> On Nov 12, 2021, at 11:37, Mark Hills <> wrote:
> >>> 
> >>> ´╗┐Surprised to hit a limit when handling a modest Maildir case; does 
> >>> this reflect a bug?
> >>> 
> >>> rsync'ing to a new mail server, after fewer than 100,000 files there 
> >>> are intermittent failures:
> >> 
> >> This is probably because you are using 1KB blocksize instead of 4KB, 
> > Is block size the only factor? If so, a patch like below (untested) could 
> > make it clear it's relevant, and saved the question in this case.
> The patch looks reasonable, but should be submitted separately with
> [patch] in the subject so that it will not be lost.  
> You can also add on your patch:
> Reviewed-by: Andreas Dilger <>

Thanks. When I get a moment I'll aim to test the patch and submit 


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