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.
-- Daniel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Sep 23 2000 - 21:00:21 EST