From: Jan Kara <jack@suse.cz>
To: Christoph Hellwig <hch@infradead.org>
Cc: Toshi Kani <toshi.kani@hpe.com>,
dan.j.williams@intel.com, jack@suse.cz, david@fromorbit.com,
viro@zeniv.linux.org.uk, axboe@fb.com, boaz@plexistor.com,
tytso@mit.edu, adilger.kernel@dilger.ca,
ross.zwisler@linux.intel.com, micah.parrish@hpe.com,
linux-nvdimm@ml01.01.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 4/5] ext2: Add alignment check for DAX mount
Date: Mon, 9 May 2016 10:23:31 +0200 [thread overview]
Message-ID: <20160509082331.GB11897@quack2.suse.cz> (raw)
In-Reply-To: <20160508085937.GD15458@infradead.org>
On Sun 08-05-16 01:59:37, Christoph Hellwig wrote:
> Not really for the patch, but given that we have the right people
> on CC:
>
> Do we really want to keep DAX support in ext2 in the long run? ext2
> is missing a lot of the useful features for a modern FS, shouldn't
> we direct people to use ext4 (in non-journal mode if needed) if they
> want to use DAX? ext4 will even support the unmodified ext2 fs, so it
> shouldn't be a big hurdle, and it would avoid a lot of churn in ext2.
I've heard concerns that embedded people use ext2 driver (due to smaller
code size than ext4 - 1.7 MB object for ext2 vs over 7 MB object for ext4
in my build) including old XIP support. DAX has replaced the old XIP code
so removing DAX from ext2 would be a regression for them - either they'd
have to go with significantly larger module or without XIP. So for now I'd
leave DAX in ext2.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2016-05-09 8:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-06 0:29 [PATCH v3 0/5] Add alignment check for DAX mount Toshi Kani
2016-05-06 0:29 ` [PATCH v3 1/5] block: Add vfs_msg() interface Toshi Kani
2016-05-08 8:56 ` Christoph Hellwig
2016-05-06 0:29 ` [PATCH v3 2/5] block: Add bdev_supports_dax() for dax mount checks Toshi Kani
2016-05-08 8:57 ` Christoph Hellwig
2016-05-08 19:14 ` Dan Williams
2016-05-09 18:12 ` Toshi Kani
2016-05-09 18:23 ` Dan Williams
2016-05-09 21:19 ` Dave Chinner
2016-05-09 22:34 ` Toshi Kani
2016-05-09 22:50 ` Toshi Kani
2016-05-06 0:29 ` [PATCH v3 3/5] ext4: Add alignment check for DAX mount Toshi Kani
2016-05-09 8:15 ` Jan Kara
2016-05-06 0:29 ` [PATCH v3 4/5] ext2: " Toshi Kani
2016-05-08 8:59 ` Christoph Hellwig
2016-05-09 8:23 ` Jan Kara [this message]
2016-05-09 8:31 ` Jan Kara
2016-05-06 0:29 ` [PATCH v3 5/5] xfs: " Toshi Kani
2016-05-08 8:58 ` Christoph Hellwig
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