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f2fs: skip releasing nodes in chindless extent tree

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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>
This commit is contained in:
Chao Yu 2016-01-08 20:24:00 +08:00 committed by Jaegeuk Kim
parent 68e3538510
commit 9b72a388f5
1 changed files with 9 additions and 4 deletions
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13
fs/f2fs/extent_cache.c
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@ -570,9 +570,11 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
/* 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 @@ free_node:
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 @@ unsigned int f2fs_destroy_extent_node(struct inode *inode)
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);