[dm-devel] [PATCH 3/3] dm-thin: fix discard_granularity
Mikulas Patocka
mpatocka at redhat.com
Mon Jul 16 18:35:45 UTC 2012
dm-thin: fix discard_granularity
The kernel expects that limits->discard_granularity is a power of two.
Set this limit only if we use a power of two block size.
Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>
---
drivers/md/dm-thin.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Index: linux-3.5-rc6-fast/drivers/md/dm-thin.c
===================================================================
--- linux-3.5-rc6-fast.orig/drivers/md/dm-thin.c 2012-07-16 20:07:49.000000000 +0200
+++ linux-3.5-rc6-fast/drivers/md/dm-thin.c 2012-07-16 20:08:01.000000000 +0200
@@ -2502,7 +2502,8 @@ static void set_discard_limits(struct po
* bios cover a block partially. A discard that spans a block boundary
* is not sent to this target.
*/
- limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT;
+ if (pool->sectors_per_block_shift >= 0)
+ limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT;
limits->discard_zeroes_data = pool->pf.zero_new_blocks;
}
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