Messages in this thread Patch in this message | | | From | Neil Brown <> | Date | Fri, 18 May 2007 10:21:53 +1000 | Subject | RE: Software raid0 will crash the file-system, when each disk is 5TB |
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On Friday May 18, Jeff.Zheng@endace.com wrote: > Fix confirmed, filled the whole 11T hard disk, without crashing. > I presume this would go into 2.6.22
Yes, and probably 2.6.21.y, though the patch will be slightly different, see below. > > Thanks again.
And thank-you for pursuing this with me.
NeilBrown
--------------------------- Avoid overflow in raid0 calculation with large components.
If a raid0 has a component device larger than 4TB, and is accessed on a 32bit machines, then as 'chunk' is unsigned lock, chunk << chunksize_bits can overflow (this can be as high as the size of the device in KB). chunk itself will not overflow (without triggering a BUG).
So change 'chunk' to be 'sector_t, and get rid of the 'BUG' as it becomes impossible to hit.
Cc: "Jeff Zheng" <Jeff.Zheng@endace.com> Signed-off-by: Neil Brown <neilb@suse.de>
### Diffstat output ./drivers/md/raid0.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff .prev/drivers/md/raid0.c ./drivers/md/raid0.c --- .prev/drivers/md/raid0.c 2007-05-17 10:33:30.000000000 +1000 +++ ./drivers/md/raid0.c 2007-05-17 16:14:12.000000000 +1000 @@ -415,7 +415,7 @@ static int raid0_make_request (request_q raid0_conf_t *conf = mddev_to_conf(mddev); struct strip_zone *zone; mdk_rdev_t *tmp_dev; - unsigned long chunk; + sector_t chunk; sector_t block, rsect; const int rw = bio_data_dir(bio); @@ -470,7 +470,6 @@ static int raid0_make_request (request_q sector_div(x, zone->nb_dev); chunk = x; - BUG_ON(x != (sector_t)chunk); x = block >> chunksize_bits; tmp_dev = zone->dev[sector_div(x, zone->nb_dev)]; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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