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

[Christoph Hellwig]

On Wed, May 11, 2011 at 12:24:58AM +0900, OGAWA Hirofumi wrote:
> > under writeback and when it's freed no writeback is started.
> 
> Sure for data -> data reallocated case. metadata -> data/metadata is
> still there.

That's usually handled differently.  For XFS take a look at the
xfs_alloc_busy_* function.  For 2.6.40 they've been mostly rewritten
to rarely wait for the reuse but instead avoid busy blocks.  But that's
a real data integrity issue even without stable pages for I/O.

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