linux-ext4 - Re: [PATCH v2 00/11] fsverity: support for non-4K pages

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Date:   Thu, 5 Jan 2023 16:54:21 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-btrfs@...r.kernel.org, linux-xfs@...r.kernel.org,
        Andrey Albershteyn <aalbersh@...hat.com>
Subject: Re: [PATCH v2 00/11] fsverity: support for non-4K pages

On Tue, Jan 03, 2023 at 11:25:18PM -0800, Eric Biggers wrote:
> 

Hi Eric,

> Thanks Ojaswin!  That's a good point about generic/692.  The right fix for it is
> to make it use $FSV_BLOCK_SIZE instead of 4K in its calculations.
Yes, that should fix the issue, I'll try to send in a patch for this
when I find some time.

> 
> I suppose you saw that issue by running the test on ext4 with fs_block_size ==
> page_size == 64K, causing xfstests to use merkle_tree_block_size == 64K by
> default.  Thanks for doing that; that's something I haven't been able to test
> yet.  My focus has been on merkle_tree_block_size < page_size.
Correct, I was testing "everything = 64k" scenario when I
noticed the slowdown.

> merkle_tree_block_size > 4K should just work, though, assuming
> merkle_tree_block_size <= min(fs_block_size, page_size).  (Or
> merkle_tree_block_size == fs_block_size == page_size before this patch series.)

Yes true, I still tested them just in case :) 

Regards,
Ojaswin