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

[Jan Kara]

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.

								Honza
-- 
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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