doc2k: "formatting block"?
Ian Eure <Ian Eure
ieure at insynq.com
Wed Feb 7 12:20:45 EST 2001
David Woodhouse writes:
> On Tue, 6 Feb 2001, Ian Eure <Ian Eure wrote:
> > while testing a 32mb doc2000, i see these messages:
> > -- snip --
> > DiskOnChip 2000 found at address 0xD0000
> > Flash chip found: Manufacturer ID: 98, Chip ID: 73 (Toshiba TH58V128DC)
> > 2 flash chips found. Total DiskOnChip size: 32 Mb
> > Block 807: referencing block 110 already in another chain
> > Formatting chain at block 807
> > Formatting block 807
> > Unreferenced block 366, formatting it
> > -- snip --
> Eep. Can you reproduce it? Did this happen after the M-Systems drivers (or
> firmware) had been writing to the device, or is it purely our software?
> It's unlikely to be hardware.
it's reproducible, but only with this one 32mb doc2000. i only have
this chip, and a 48mb doc2000 for testing right now.
the doc had been written to by the m-sys driver before.
> I'm trying to grok that code - even if the block _is_ linked in another
> chain, we should be able to work out which chain it _ought_ to be in by
> its own VirtUnitNum entry. We still have to format the chain in which the
> block _isn't_ supposed to be, and there's definitely some data corruption
> happened, but we should be able to do a little better than we do ATM, I
> I don't see how this could be caused by a fold in progress - we don't fold
> one chain into _another_, only into itself. But the comment implies
> printk("Block %d: referencing block %d already in another chain\n",
> block, rep_block);
> /* XXX: should handle correctly fold in progress chains */
> do_format_chain = 1;
> s->ReplUnitTable[block] = BLOCK_NIL;
i'm an intermediate c programmer, and have no experience with kernel
programming. but, i'd like to try and help you, so i'm just gonna jump
in. some patches may (or may not) fly out in a few days or weeks. :)
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