linux-kernel - Re: [PATCH v14 128/138] iomap: Support multi-page folios in invalidatepage

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Message-ID: <YPDzu5Upm85z1tDN@casper.infradead.org>
Date:   Fri, 16 Jul 2021 03:49:31 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v14 128/138] iomap: Support multi-page folios in
 invalidatepage

On Thu, Jul 15, 2021 at 03:10:18PM -0700, Darrick J. Wong wrote:
> On Thu, Jul 15, 2021 at 04:36:54AM +0100, Matthew Wilcox (Oracle) wrote:
> > If we're punching a hole in a multi-page folio, we need to remove the
> > per-page iomap data as the folio is about to be split and each page will
> > need its own.  This means that writepage can now come across a page with
> > no iop allocated, so remove the assertion that there is already one,
> > and just create one (with the uptodate bits set) if there isn't one.
> > 
> > Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> 
> Lol, Andreas already did the bottom half of the change for you.

Heh, yes, I copy-and-pasted it from this patch ;-)  Thanks for
merging it!