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dm snapshot: simplify sector_to_chunk expression

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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>
This commit is contained in:
Mikulas Patocka 2009-12-10 23:52:08 +00:00 committed by Alasdair G Kergon
parent f5acc83428
commit 102c6ddb1d
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-exception-store.h
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@ -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);