Re: 2.0, 2.2, 2.4, 2.5: fsync buffer race

Andrew Morton (akpm@digeo.com)
Sun, 2 Feb 2003 17:20:05 -0800

Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> wrote:
>
> > void wait_and_rw_block(...)
> > {
> > wait_on_buffer(bh);
> > ll_rw_block(...);
> > }
>
> It would fail if other CPU submits IO with ll_rw_block after
> wait_on_buffer but before ll_rw_block.

In that case, the caller's data gets written anyway, and the caller will wait
upon the I/O which the other CPU started. So the ll_rw_block() behaviour is
appropriate.
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