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| author | Joe Thornber <ejt@redhat.com> | 2013-08-09 14:19:32 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-11-09 18:20:24 -0500 |
| commit | 40c57f475f416ab241124e1e6a593b2f982eaae3 (patch) | |
| tree | 1d15b08035b871d9fd2fab9df882fdef68330ab1 /drivers/md/persistent-data | |
| parent | 41d35d25e9d4e1b5e944b70f1bec272bcff5f489 (diff) | |
| download | lwn-40c57f475f416ab241124e1e6a593b2f982eaae3.tar.gz lwn-40c57f475f416ab241124e1e6a593b2f982eaae3.zip | |
dm space map disk: optimise sm_disk_dec_block
Don't waste time spotting blocks that have been allocated and then freed
in the same transaction.
The extra lookup is expensive, and I don't think it really gives us much.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/persistent-data')
| -rw-r--r-- | drivers/md/persistent-data/dm-space-map-disk.c | 18 |
1 files changed, 1 insertions, 17 deletions
diff --git a/drivers/md/persistent-data/dm-space-map-disk.c b/drivers/md/persistent-data/dm-space-map-disk.c index e735a6d5a793..cfbf9617e465 100644 --- a/drivers/md/persistent-data/dm-space-map-disk.c +++ b/drivers/md/persistent-data/dm-space-map-disk.c @@ -140,26 +140,10 @@ static int sm_disk_inc_block(struct dm_space_map *sm, dm_block_t b) static int sm_disk_dec_block(struct dm_space_map *sm, dm_block_t b) { - int r; - uint32_t old_count; enum allocation_event ev; struct sm_disk *smd = container_of(sm, struct sm_disk, sm); - r = sm_ll_dec(&smd->ll, b, &ev); - if (!r && (ev == SM_FREE)) { - /* - * It's only free if it's also free in the last - * transaction. - */ - r = sm_ll_lookup(&smd->old_ll, b, &old_count); - if (r) - return r; - - if (!old_count) - smd->nr_allocated_this_transaction--; - } - - return r; + return sm_ll_dec(&smd->ll, b, &ev); } static int sm_disk_new_block(struct dm_space_map *sm, dm_block_t *b) |