linux-kernel - Re: [PATCH v7 05/14] ext4, dax: introduce ext4_dax

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Message-ID: <CAPcyv4gknYC3WUEEfGjNH8ufFvokdZarSaZUm-cczCXyEz_D0w@mail.gmail.com>
Date:   Thu, 29 Mar 2018 15:47:55 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jan Kara <jack@...e.cz>, linux-nvdimm <linux-nvdimm@...ts.01.org>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        david <david@...morbit.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 05/14] ext4, dax: introduce ext4_dax_aops

On Thu, Mar 29, 2018 at 11:09 AM, Christoph Hellwig <hch@....de> wrote:
> On Thu, Mar 29, 2018 at 05:40:35PM +0200, Jan Kara wrote:
>> So ext4_direct_IO() for IS_DAX() files will just bail out. So could you
>> just provide ext4_dax_direct_IO() which will bail out and use it here? With
>> a similar comment as in xfs_vm_direct_IO() that open still needs this
>> method set... Thanks!
>
> In fact a common noop_direct_IO might make sense.

Ok, I introduced noop_direct_IO() in "fs, dax: prepare for
dax-specific address_space_operations", and cleaned up xfs, ext4, and
ext2 accordingly. Let me know if you want to see a resend of the
series with those changes. Otherwise this will appear in -next
shortly.