linux-ext4 - Re: [PATCH 8/9] fs/ext4: Introduce DAX inode flag

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Message-ID: <20200514065524.GC2140786@iweiny-DESK2.sc.intel.com>
Date:   Wed, 13 May 2020 23:55:25 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Al Viro <viro@...iv.linux.org.uk>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>, Jeff Moyer <jmoyer@...hat.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/9] fs/ext4: Introduce DAX inode flag

On Thu, May 14, 2020 at 08:43:35AM +0200, Jan Kara wrote:
> On Wed 13-05-20 14:41:55, Ira Weiny wrote:
> > On Wed, May 13, 2020 at 04:47:06PM +0200, Jan Kara wrote:
> > >
> > > So I think you'll have to check
> > > whether DAX flag is being changed,
> > 
> > ext4_dax_dontcache() does check if the flag is being changed.
> 
> Yes, but if you call it after inode flags change, you cannot determine that
> just from flags and EXT4_I(inode)->i_flags. So that logic needs to change.

I just caught this email... just after sending V1.

I've moved where ext4_dax_dontcache() is called.  I think it is ok now with the
current check.

LMK if I've messed it up...  :-/

Ira

> 
> 								Honza
> 
> -- 
> Jan Kara <jack@...e.com>
> SUSE Labs, CR