Re: Linux 2.4.30-rc3 md/ext3 problems (ext3 gurus : please check)

[Andrew Morton <akpm@osdl.org>]

"Stephen C. Tweedie" <sct@redhat.com> wrote:
>
> Andrew, what was the exact illegal state of the pages you were seeing
>  when fixing that recent leak?  It looks like it's nothing more complex
>  than dirty buffers on an anon page.

Correct.

>  I think that simply calling
>  try_to_release_page() for all the remaining buffers at umount time will

Presumably these pages have no ->mapping, so try_to_release_page() will
call try_to_free_buffers().

>  be enough to catch these; if that function fails, it tells us that the
>  VM can't reclaim these pages.

Yes, if the buffers are dirty then 2.4's try_to_free_buffers() won't free
them.

>  The only thing that would be required on
>  top of that would be a check that the page is also on the VM LRU lists.

Why do we have dirty buffers left over at umount time?
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