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Old 08-05-2010, 06:45 PM
Jeff Moyer
 
Default bio, fs: update READA and SWRITE to match the corresponding BIO_RW_* bits

Tejun Heo <tj@kernel.org> writes:

> Commit a82afdf (block: use the same failfast bits for bio and request)
> moved BIO_RW_* bits around such that they match up with REQ_* bits.
> Unfortunately, fs.h hard coded READ, WRITE, READA and SWRITE as 0, 1,
> 2 and 3, and expected them to match with BIO_RW_* bits. READ/WRITE
> didn't change but BIO_RW_AHEAD was moved to bit 4 instead of bit 1,
> breaking READA and SWRITE.
>
> This patch updates READA and SWRITE such that they match the BIO_RW_*
> bits again. A follow up patch will update the definitions to directly
> use BIO_RW_* bits so that this kind of breakage won't happen again.
>
> Stable: The offending commit a82afdf was released with v2.6.32, so
> this patch should be applied to all kernels since then but it must
> _NOT_ be applied to kernels earlier than that.

Would someone be so kind as to remind me how this problem manifests
itself? I know I read this recently, but my memory and googling skills
are both failing me.

Cheers,
Jeff

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