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SubjectRe: The INN/mmap bug
Daniel Phillips wrote:
> Alexander Viro wrote:
> > On Tue, 19 Sep 2000, Daniel Phillips wrote:
> >
> > > !Mapped, !Uptodate, Dirty: pending map and write
> >
> > Wrong. It's an instant BUG at line 711 in ll_rw_blk.c - remember these
> > reports?

Yes, correct, this state should not escape from prepare_write, though
that's only a limitation of the current code.

Here's the corrected, corrected table:

Mapped, Uptodate, Dirty: pending write
!Mapped, Uptodate, Dirty: not possible
Mapped, !Uptodate, Dirty: not possible
!Mapped, !Uptodate, Dirty: not possible
Mapped, Uptodate, !Dirty: regular block
!Mapped, Uptodate, !Dirty: hole of zeroes
Mapped, !Uptodate, !Dirty: unread
!Mapped, !Uptodate, !Dirty: pending map

And here's the punchline: why not have 5 states instead of 3 bits and
set the state with a single function call, instead of the mutiple bit
sets we see now.

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