Re: [RFC] block integrity: Fix write after checksum calculation problem

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Excerpts from Christoph Hellwig's message of 2011-04-11 14:25:41 -0400:
> On Mon, Apr 11, 2011 at 01:41:16PM -0400, Chris Mason wrote:
> > Actually this isn't a nit.  Keeping the page locked closes an important
> > hole where it can become writeback again.  It might fix the last
> > remaining problem.
> 
> Note that the generic block_page_mkwrite atually does that.  But only
> xfs and nilfs2 actually make use of it.
> 

Btrfs does return VM_FAULT_LOCKED though.  I had forgotten to look for
this in the ext4 page_mkwrite call.

-chris
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