linux-kernel - Re: [RFC 0/4] convert create_page_buffers to create_folio

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Date:   Fri, 14 Apr 2023 15:56:19 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Pankaj Raghav <p.raghav@...sung.com>, brauner@...nel.org,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mcgrof@...nel.org, gost.dev@...sung.com
Subject: Re: [RFC 0/4] convert create_page_buffers to create_folio_buffers

On 4/14/23 15:51, Matthew Wilcox wrote:
> On Fri, Apr 14, 2023 at 03:47:13PM +0200, Hannes Reinecke wrote:
>> BTW; I've got another patch replacing 'writepage' with 'write_folio'
>> (and the corresponding argument update). Is that a direction you want to go?
> 
> No; ->writepage is being deleted.  It's already gone from ext4 and xfs.

Aw.
And here's me having converted block/fops over to using iomap w/ 
iomap_writepage(). Tough.

Oh well.
Wasn't a great fit anyway as for a sb_bread() replacement we would need 
a sub-page access for iomap.
Question is whether we really need that or shouldn't read PAGE_SIZE 
sectors always. Surely would make life easier. And would save us all the 
logic with bh_lru etc as we can rely on the page cache.

But probably an item for the iomap discussion at LSF.

Unless you got plans already ...

Cheers,

Hannes