f2fs: skip releasing nodes in chindless extent tree
If there are no nodes in extent tree, let's skip releasing step to avoid
any overhead of grabbing/releasing extent tree lock.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 9febbc6..ccd5c63 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -570,9 +570,11 @@
/* 1. remove unreferenced extent tree */
list_for_each_entry_safe(et, next, &sbi->zombie_list, list) {
- write_lock(&et->lock);
- node_cnt += __free_extent_tree(sbi, et, true);
- write_unlock(&et->lock);
+ if (atomic_read(&et->node_cnt)) {
+ write_lock(&et->lock);
+ node_cnt += __free_extent_tree(sbi, et, true);
+ write_unlock(&et->lock);
+ }
list_del_init(&et->list);
radix_tree_delete(&sbi->extent_tree_root, et->ino);
@@ -618,6 +620,9 @@
for (i = 0; i < found; i++) {
struct extent_tree *et = treevec[i];
+ if (!atomic_read(&et->node_cnt))
+ continue;
+
if (write_trylock(&et->lock)) {
node_cnt += __free_extent_tree(sbi, et, false);
write_unlock(&et->lock);
@@ -641,7 +646,7 @@
struct extent_tree *et = F2FS_I(inode)->extent_tree;
unsigned int node_cnt = 0;
- if (!et)
+ if (!et || !atomic_read(&et->node_cnt))
return 0;
write_lock(&et->lock);