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Commit 9b72a388 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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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: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 68e35385

fs/f2fs/extent_cache.c

+9 −4
Original line number Diff line number Diff line
@@ -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) {

		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 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) 
		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);