Re: EXT2 and BadBlock updating.....

[Andrzej Krzysztofowicz]

> 
>    Date: 	Tue, 11 Apr 2000 22:20:43 -0700 (PDT)
>    From: Andre Hedrick <[e-mail]>
> 
>    On Thu, 6 Apr 2000, Alan Cox wrote:
> 
>    > > > Multiwrite IDE breaks on a disk error
>    > >
>    > > Explain.........Please........
>    >
>    > If you have one bad sector you should write the other 7..
> 
>    Now if the ata/ide driver does not address this recovery then I see big
>    problems.  Alan's case (my reading) states that regardless if we blow the
>    write to a sector (based on 8 multi-write command) we should write all
>    that we can........
> 
> That's definitely the case.  If you're writing 8 sectors, and sector #4
> has an error, the driver shouldn't give up and not write sectors 5-8!

Some time ago I observed similar problem with reading. If there was a bad
block on the disk ll_rw_block() returned an error while reading some blocks 
following the bad one in PIO/DMA mode when multicount/readahead were set,
respectively.
However, I can't check this with present kernels as I do not have a disk
with bad blocks now...

I observed this efect running badblocks program with different disk
settings: 
- when multicount/readahead were set to 0 (or 1) only the really bad
  blocks were reported as bad,
- when multicount/readahead were set to >1 more blocks were reported as
  bad...

Andrzej