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authorMikulas Patocka <mpatocka@redhat.com>2009-12-10 23:52:08 +0000
committerAlasdair G Kergon <agk@redhat.com>2009-12-10 23:52:08 +0000
commit102c6ddb1d081a6a1fede38c43a42c9811313ec7 (patch)
tree2274305e73dccefa6a4620180339ec04504f93fb /drivers/md/dm-exception-store.h
parentf5acc834287dd4f6cf712093ce0e779e38caad70 (diff)
dm snapshot: simplify sector_to_chunk expression
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>
Diffstat (limited to 'drivers/md/dm-exception-store.h')
-rw-r--r--drivers/md/dm-exception-store.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 8a223a48802..5f9315b32a4 100644
--- 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(struct block_device *bdev)
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);