Jan Kara wrote:
>> This is exactly the solution I proposed earlier (to check
>> buffer_mapped() before calling submit_bh()).
>> But at that time, Jan pointed out that the whole handling is wrong.
> Yes, and it was. However it turned out that there are more problems
> than I thought ;).
>
>> But if this is the only case we need to handle, I am okay with this band
>> aid :)
> I think Eric's patch may be a part of it. But we still need to check whether
> the buffer is not after EOF before submitting it (or better said just
> after we manage to lock the buffer). Because while we are waiting for
> the buffer lock, journal_unmap_buffer() can still come and steal the
> buffer - at least the write-out in journal_dirty_data() definitely needs
> the check if I haven't overlooked something.
Ok, let me think on that today. My first reaction is that if we have
the bh state lock and pay attention to mapped in journal_dirty_data(),
then any blocks past EOF which have gotten unmapped by
journal_unmap_buffer will be recognized as such (because they are now
unmapped... without needing to check for past EOF...) and we'll be fine.
As a datapoint, davej's stresstest (several fsx's and fsstresses)
survived an overnight run on his box, which used to panic in < 2 hrs.
Survived about 6 hours on my box until I intentionally stopped it; my
box had added a write/truncate test in a loop, with a bunch of periodic
syncs as well....
-Eric
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