linux-kernel - Re: trouble with mounting a 1.5 TB raid6 volume in 2.6.19-rc5-mm1

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Date:	Mon, 13 Nov 2006 16:01:59 +1100
From:	Neil Brown <neilb@...e.de>
To:	Jurriaan <thunder7@...all.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: trouble with mounting a 1.5 TB raid6 volume in 2.6.19-rc5-mm1

On Saturday November 11, thunder7@...all.nl wrote:
> I have a 8 disk 1.5 TB raid6 volume that won't mount in 2.6.19-rc5-mm1.
> Below the output of trying to mount the ext3 volume, which fails, and
> the very wrong output after mounting it as ext2. Also, mdstat details,
> .config and dmesg output.
> 
> This volume works just fine in 2.6.18-mm3 or 2.6.19-rc2-mm2. I'm willing
> to test, but I'm not that willing to wreck my volume :-)

Can you try reverting this patch (patch -p1 -R) ?

It is the most likely candidate.  Meanwhile I look to see if I can
see how this could be happening.

NeilBrown


--------------------------
Enable bypassing cache for reads.

From: "Raz Ben-Jehuda(caro)" <raziebe@...il.com>

Call the chunk_aligned_read where appropriate.

Signed-off-by: Neil Brown <neilb@...e.de>

### Diffstat output
 ./drivers/md/raid5.c |    5 +++++
 1 file changed, 5 insertions(+)

diff .prev/drivers/md/raid5.c ./drivers/md/raid5.c
--- .prev/drivers/md/raid5.c	2006-11-06 11:29:14.000000000 +1100
+++ ./drivers/md/raid5.c	2006-11-06 11:29:14.000000000 +1100
@@ -2798,6 +2798,11 @@ static int make_request(request_queue_t 
 	disk_stat_inc(mddev->gendisk, ios[rw]);
 	disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi));
 
+	if ( bio_data_dir(bi) == READ &&
+	     mddev->reshape_position == MaxSector &&
+	     chunk_aligned_read(q,bi))
+            		return 0;
+
 	logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1);
 	last_sector = bi->bi_sector + (bi->bi_size>>9);
 	bi->bi_next = NULL;
-
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