linux-kernel - Re: [PATCH] mm/filemap: do not allocate cache pages beyond end of file at read

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Message-ID: <CAHpGcM+o2OwXdrj+A2_OqRg6YokfauFNiBJF-BQp0dJFvq_BrQ@mail.gmail.com>
Date:   Sat, 23 Nov 2019 00:59:18 +0100
From:   Andreas Grünbacher <andreas.gruenbacher@...il.com>
To:     Steven Whitehouse <swhiteho@...hat.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Linux-MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Johannes Weiner <hannes@...xchg.org>,
        "cluster-devel@...hat.com" <cluster-devel@...hat.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Steve French <sfrench@...ba.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Bob Peterson <rpeterso@...hat.com>
Subject: Re: [PATCH] mm/filemap: do not allocate cache pages beyond end of
 file at read

Hi,

Am Do., 31. Okt. 2019 um 12:43 Uhr schrieb Steven Whitehouse
<swhiteho@...hat.com>:
> Andreas, Bob, have I missed anything here?

I've looked into this a bit, and it seems that there's a reasonable
way to get rid of the lock taking in ->readpage and ->readpages
without a lot of code duplication. My proposal for that consists of
multiple patches, so I've posted it separately:

https://lore.kernel.org/linux-fsdevel/20191122235324.17245-1-agruenba@redhat.com/T/#t

Thanks,
Andreas