Re: [SSI-devel] cfs_writepages(): Is it a bug?

[Roger T. <rog...@gm...>]

I believe I fixed your problem with CFS over dm with my latest CVS checkin.

Roger

On 6/21/06, Vladimir Razgulin <one...@gm...> wrote:
> All,
> Here's what I've found in the cfs code, and believe might be an issue:
>
> 1. cfs_writepages() function uses test_and_set_bit() and clear_bit()
> to manipulate BDI_write_congested bit in &bdi->state, and calls
> wake_up_all()  to wake up cfs_write_on_congestion().
>
> 2. cfs_write_on_congestion() uses a different way to access
> BDI_write_congested bit - it calls bdi_write_congested() function.
>
> 3. bdi_write_congested() checks bdi->congested_fn, and call the
> corresponding function if it's not NULL. In that case it just ignore
> bdi->state field that was set by cfs_writepages()
>
> 4. bdi->congested_fn is not NULL, if cfs sits on toop of an ext3 fs
> residing on a device-mapped device (it points to dm_any_congested() in
> that case)
>
> The same problem seems to exist for NFS as well.
>
> Is cfs able to work with dm-ed devices?
>
> Thanks
> Vladimir
>
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