Re: 2.6.4-mm2

[Andrew Morton]

Andrew Morton <akpm@xxxxxxxx> wrote:
>
> I'm thinking that the right thing to do here is to change submit_bh()
> callers and ll_rw_block() to run set_page_writeback(bh->b_page) when they
> start the buffer writeout and to do the run-around-the-buffer_heads thing
> at I/O completion.

A page may have a mix of writeback and dirty+non-writeback buffers.  It
appears that the page-level writeback code will handle this correctly.  But
it requires that the page lock be held when we run set_page_writeback(), so
that tears that.  hmm.

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