From: Ross Zwisler <ross.zwisler@linux.intel.com>
To: Jan Kara <jack@suse.cz>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>,
linux-kernel@vger.kernel.org, "Theodore Ts'o" <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Dan Williams <dan.j.williams@intel.com>, Jan Kara <jack@suse.com>,
linux-ext4@vger.kernel.org, linux-nvdimm@ml01.01.org
Subject: Re: [PATCH] ext4: allow DAX writeback for hole punch
Date: Wed, 17 Aug 2016 12:07:22 -0600 [thread overview]
Message-ID: <20160817180722.GB16779@linux.intel.com> (raw)
In-Reply-To: <20160817171955.GA30893@quack2.suse.cz>
On Wed, Aug 17, 2016 at 07:19:55PM +0200, Jan Kara wrote:
> On Wed 17-08-16 10:11:02, Ross Zwisler wrote:
> > Currently when doing a DAX hole punch with ext4 we fail to do a writeback.
> > This is because the logic around filemap_write_and_wait_range() in
> > ext4_punch_hole() only looks for dirty page cache pages in the radix tree,
> > not for dirty DAX exceptional entries.
> >
> > Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
>
> Thanks. The patch looks correct, you can add:
>
> Reviewed-by: Jan Kara <jack@suse.cz>
>
> Although why don't we just simplify the test below to
> mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)? After all the mapping should
> not have the dirty tag set if there are no pages / no entries?
Sure, that works. I'll update to that in V2, and I'll add stable. Thanks!
next prev parent reply other threads:[~2016-08-17 18:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-17 16:11 [PATCH] ext4: allow DAX writeback for hole punch Ross Zwisler
2016-08-17 17:19 ` Jan Kara
2016-08-17 18:07 ` Ross Zwisler [this message]
2016-08-17 18:23 ` [PATCH v2] " Ross Zwisler
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