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dm thin: cleanup schedule_zero() to read more logically 

The overwrite has only ever about optimizing away the need to zero a
block if the entire block was being overwritten.  As such it is only
relevant when zeroing is enabled.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
This commit is contained in:
Mike Snitzer 2015-05-14 11:28:37 -04:00
parent 8b908f8e94
commit f8ae75253e
1 changed files with 7 additions and 9 deletions
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12
drivers/md/dm-thin.c
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@ -1086,16 +1086,14 @@ static void schedule_zero(struct thin_c *tc, dm_block_t virt_block,
* zeroing pre-existing data, we can issue the bio immediately.
* Otherwise we use kcopyd to zero the data first.
*/
if (!pool->pf.zero_new_blocks)
process_prepared_mapping(m);
else if (io_overwrites_block(pool, bio))
if (pool->pf.zero_new_blocks) {
if (io_overwrites_block(pool, bio))
remap_and_issue_overwrite(tc, bio, data_block, m);
else
ll_zero(tc, m,
data_block * pool->sectors_per_block,
ll_zero(tc, m, data_block * pool->sectors_per_block,
(data_block + 1) * pool->sectors_per_block);
} else
process_prepared_mapping(m);
}
static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block,