Re: [PATCH v3 4/5] ext2: Add alignment check for DAX mount

[Jan Kara]

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@xxxxxxxx>
SUSE Labs, CR