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

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Message-ID: <ZQS1o38TOOI+AY5H@casper.infradead.org>
Date:   Fri, 15 Sep 2023 20:50:59 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Pankaj Raghav <kernel@...kajraghav.com>
Cc:     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,
        mcgrof@...nel.org, 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 08:38:33PM +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.