Messages in this thread |  | | Date | Mon, 22 Jan 2001 19:36:30 +0000 | From | Edward <> | Subject | Re: [PATCH] - filesystem corruption on soft RAID5 in 2.4.0+ |
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Neil Brown wrote: > > There have been assorted reports of filesystem corruption on raid5 in > 2.4.0, and I have finally got a patch - see below. > I don't know if it addresses everybody's problems, but it fixed a very > really problem that is very reproducable. > > The problem is that parity can be calculated wrongly when doing a > read-modify-write update cycle. If you have a fully functional, you > wont notice this problem as the parity block is never used to return > data. But if you have a degraded array, you will get corruption very > quickly. > So I think this will solve the reported corruption with ext2fs, as I > think they were mostly on degradred arrays. I have no idea whether it > will address the reiserfs problems as I don't think anybody reporting > those problems described their array.
But we deal with a fully functional one. Nevertheless this patch fixed reiserfs corruption.. Thanks. Edward.
> > In any case, please apply, and let me know of any further problems. > > --- ./drivers/md/raid5.c 2001/01/21 04:01:57 1.1 > +++ ./drivers/md/raid5.c 2001/01/21 20:36:05 1.2 > @@ -714,6 +714,11 @@ > break; > } > spin_unlock_irq(&conf->device_lock); > + if (count>1) { > + xor_block(count, bh_ptr); > + count = 1; > + } > + > for (i = disks; i--;) > if (chosen[i]) { > struct buffer_head *bh = sh->bh_cache[i]; - 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/
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