Re: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses

[Chris Mason <chris.mason@oracle.com>]

Excerpts from Jan Kara's message of 2011-05-10 08:51:24 -0400:
> On Mon 09-05-11 16:03:18, Darrick J. Wong wrote:
> > I am still chasing down what exactly is broken in ext3.  data=writeback mode
> > passes with no failures.  data=ordered, however, does not pass; my current
> > suspicion is that jbd is calling submit_bh on data buffers but doesn't call
> > page_mkclean to kick the userspace programs off the page before writing it.
>   Yes, ext3 in data=ordered mode writes pages from
> journal_commit_transaction() via submit_bh() without clearing page dirty
> bits thus page_mkclean() is not called for these pages. Frankly, do you
> really want to bother with adding support for ext2 and ext3? People can use
> ext4 as a fs driver when they want to start using blk-integrity support.
> Especially ext2 patch looks really painful and just from a quick look I can
> see code e.g. in fs/ext2/namei.c which isn't handled by your patch yet.

I think ext23 are going to be pretty big changes, we're best off just
going with ext4.

-chris

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