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| author | Zhao Lei <zhaolei@cn.fujitsu.com> | 2015-12-18 21:48:48 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-02-16 13:21:45 +0100 |
| commit | c37f49c7ef317fb8043fd28594d1e5d728a1ef89 (patch) | |
| tree | 1a665e48696503f004fbeae82c2cb7de48e2b977 /fs/btrfs/reada.c | |
| parent | 503785306d182ab624a2232856ef8ab503ee85f9 (diff) | |
| download | linux-rt-c37f49c7ef317fb8043fd28594d1e5d728a1ef89.tar.gz | |
btrfs: reada: reduce additional fs_info->reada_lock in reada_find_zone
We can avoid additional locking-acquirment and one pair of
kref_get/put by combine two condition.
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/reada.c')
| -rw-r--r-- | fs/btrfs/reada.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c index 49b3fb73ffbf..74480809be76 100644 --- a/fs/btrfs/reada.c +++ b/fs/btrfs/reada.c @@ -260,18 +260,14 @@ static struct reada_zone *reada_find_zone(struct btrfs_fs_info *fs_info, spin_lock(&fs_info->reada_lock); ret = radix_tree_gang_lookup(&dev->reada_zones, (void **)&zone, logical >> PAGE_CACHE_SHIFT, 1); - if (ret == 1) + if (ret == 1 && logical >= zone->start && logical <= zone->end) { kref_get(&zone->refcnt); - spin_unlock(&fs_info->reada_lock); - - if (ret == 1) { - if (logical >= zone->start && logical <= zone->end) - return zone; - spin_lock(&fs_info->reada_lock); - kref_put(&zone->refcnt, reada_zone_release); spin_unlock(&fs_info->reada_lock); + return zone; } + spin_unlock(&fs_info->reada_lock); + cache = btrfs_lookup_block_group(fs_info, logical); if (!cache) return NULL; |