linux-kernel - Re: [RFC 08/23] filemap: align the index to mapping_min_order in filemap_get_folios

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Message-ID: <ZQiYkhDDsWS7PNzZ@bombadil.infradead.org>
Date:   Mon, 18 Sep 2023 11:36:02 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Pankaj Raghav <kernel@...kajraghav.com>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, p.raghav@...sung.com,
        david@...morbit.com, da.gomez@...sung.com,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        djwong@...nel.org, linux-mm@...ck.org, chandan.babu@...cle.com,
        gost.dev@...sung.com
Subject: Re: [RFC 08/23] filemap: align the index to mapping_min_order in
 filemap_get_folios_tag()

On Fri, Sep 15, 2023 at 08:50:59PM +0100, Matthew Wilcox wrote:
> On Fri, Sep 15, 2023 at 08:38:33PM +0200, Pankaj Raghav wrote:
> > From: Luis Chamberlain <mcgrof@...nel.org>
> > 
> > Align the index to the mapping_min_order number of pages while setting
> > the XA_STATE in filemap_get_folios_tag().
> 
> ... because?  It should already search backwards in the page cache,
> otherwise calling sync_file_range() would skip the start if it landed
> in a tail page of a folio.

Thanks! Will drop and verify!

  Luis