| From 102c6ddb1d081a6a1fede38c43a42c9811313ec7 Mon Sep 17 00:00:00 2001 |
| From: Mikulas Patocka <mpatocka@redhat.com> |
| Date: Thu, 10 Dec 2009 23:52:08 +0000 |
| Subject: dm snapshot: simplify sector_to_chunk expression |
| |
| From: Mikulas Patocka <mpatocka@redhat.com> |
| |
| commit 102c6ddb1d081a6a1fede38c43a42c9811313ec7 upstream. |
| |
| Removed unnecessary 'and' masking: The right shift discards the lower |
| bits so there is no need to clear them. |
| |
| (A later patch needs this change to support a 32-bit chunk_mask.) |
| |
| Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> |
| Reviewed-by: Mike Snitzer <snitzer@redhat.com> |
| Reviewed-by: Jonathan Brassow <jbrassow@redhat.com> |
| Signed-off-by: Alasdair G Kergon <agk@redhat.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
| |
| --- |
| drivers/md/dm-exception-store.h | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/drivers/md/dm-exception-store.h |
| +++ b/drivers/md/dm-exception-store.h |
| @@ -162,7 +162,7 @@ static inline sector_t get_dev_size(stru |
| static inline chunk_t sector_to_chunk(struct dm_exception_store *store, |
| sector_t sector) |
| { |
| - return (sector & ~store->chunk_mask) >> store->chunk_shift; |
| + return sector >> store->chunk_shift; |
| } |
| |
| int dm_exception_store_type_register(struct dm_exception_store_type *type); |
