linux-ext4 - Re: [PATCH v3] fsverity: stop using PG

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Date:   Thu, 10 Nov 2022 00:21:06 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-fscrypt@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH v3] fsverity: stop using PG_error to track error status

On Fri, Oct 28, 2022 at 10:58:07AM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> As a step towards freeing the PG_error flag for other uses, change ext4
> and f2fs to stop using PG_error to track verity errors.  Instead, if a
> verity error occurs, just mark the whole bio as failed.  The coarser
> granularity isn't really a problem since it isn't any worse than what
> the block layer provides, and errors from a multi-page readahead aren't
> reported to applications unless a single-page read fails too.
> 
> f2fs supports compression, which makes the f2fs changes a bit more
> complicated than desired, but the basic premise still works.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> ---
> 
> In v3, I made a small simplification to the f2fs changes.  I'm also only
> sending the fsverity patch now, since the fscrypt one is now upstream.  
> 
>  fs/ext4/readpage.c |  8 ++----
>  fs/f2fs/compress.c | 64 ++++++++++++++++++++++------------------------
>  fs/f2fs/data.c     | 48 +++++++++++++++++++---------------
>  fs/verity/verify.c | 12 ++++-----
>  4 files changed, 67 insertions(+), 65 deletions(-)

I've applied this to the fsverity tree for 6.2.

Reviews would be greatly appreciated, of course.

- Eric