[PATCH 3/4] btrfs: convert btrfs_block_group::needs_free_space to runtime flag

[David Sterba <dsterba@suse.com>]

We already have flags in block group to track various status bits,
convert needs_free_space as well and reduce size of btrfs_block_group.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/block-group.c                 |  2 +-
 fs/btrfs/block-group.h                 |  8 ++------
 fs/btrfs/free-space-tree.c             | 10 +++++-----
 fs/btrfs/tests/free-space-tree-tests.c |  2 +-
 4 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index ea5fcb665daa..708d843daa72 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -2553,7 +2553,7 @@ struct btrfs_block_group *btrfs_make_block_group(struct btrfs_trans_handle *tran
 	cache->global_root_id = calculate_global_root_id(fs_info, cache->start);
 
 	if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
-		cache->needs_free_space = 1;
+		set_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &cache->runtime_flags);
 
 	ret = btrfs_load_block_group_zone_info(cache, true);
 	if (ret) {
diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h
index 6c970a486b68..4cee23c11938 100644
--- a/fs/btrfs/block-group.h
+++ b/fs/btrfs/block-group.h
@@ -55,6 +55,8 @@ enum btrfs_block_group_flags {
 	BLOCK_GROUP_FLAG_CHUNK_ITEM_INSERTED,
 	BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
 	BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
+	/* Does the block group need to be added to the free space tree? */
+	BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE,
 };
 
 enum btrfs_caching_type {
@@ -208,12 +210,6 @@ struct btrfs_block_group {
 	/* Lock for free space tree operations. */
 	struct mutex free_space_lock;
 
-	/*
-	 * Does the block group need to be added to the free space tree?
-	 * Protected by free_space_lock.
-	 */
-	int needs_free_space;
-
 	/* Flag indicating this block group is placed on a sequential zone */
 	bool seq_zone;
 
diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c
index 869d062d6765..c667e878ef1a 100644
--- a/fs/btrfs/free-space-tree.c
+++ b/fs/btrfs/free-space-tree.c
@@ -808,7 +808,7 @@ int __remove_from_free_space_tree(struct btrfs_trans_handle *trans,
 	u32 flags;
 	int ret;
 
-	if (block_group->needs_free_space) {
+	if (test_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &block_group->runtime_flags)) {
 		ret = __add_block_group_free_space(trans, block_group, path);
 		if (ret)
 			return ret;
@@ -1001,7 +1001,7 @@ int __add_to_free_space_tree(struct btrfs_trans_handle *trans,
 	u32 flags;
 	int ret;
 
-	if (block_group->needs_free_space) {
+	if (test_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &block_group->runtime_flags)) {
 		ret = __add_block_group_free_space(trans, block_group, path);
 		if (ret)
 			return ret;
@@ -1304,7 +1304,7 @@ static int __add_block_group_free_space(struct btrfs_trans_handle *trans,
 {
 	int ret;
 
-	block_group->needs_free_space = 0;
+	clear_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &block_group->runtime_flags);
 
 	ret = add_new_free_space_info(trans, block_group, path);
 	if (ret)
@@ -1326,7 +1326,7 @@ int add_block_group_free_space(struct btrfs_trans_handle *trans,
 		return 0;
 
 	mutex_lock(&block_group->free_space_lock);
-	if (!block_group->needs_free_space)
+	if (!test_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &block_group->runtime_flags))
 		goto out;
 
 	path = btrfs_alloc_path();
@@ -1359,7 +1359,7 @@ int remove_block_group_free_space(struct btrfs_trans_handle *trans,
 	if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE))
 		return 0;
 
-	if (block_group->needs_free_space) {
+	if (test_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &block_group->runtime_flags)) {
 		/* We never added this block group to the free space tree. */
 		return 0;
 	}
diff --git a/fs/btrfs/tests/free-space-tree-tests.c b/fs/btrfs/tests/free-space-tree-tests.c
index 53a17b1d1744..b61972046feb 100644
--- a/fs/btrfs/tests/free-space-tree-tests.c
+++ b/fs/btrfs/tests/free-space-tree-tests.c
@@ -471,7 +471,7 @@ static int run_test(test_func_t test_func, int bitmaps, u32 sectorsize,
 	}
 	cache->bitmap_low_thresh = 0;
 	cache->bitmap_high_thresh = (u32)-1;
-	cache->needs_free_space = 1;
+	set_bit(BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE, &cache->runtime_flags);
 	cache->fs_info = root->fs_info;
 
 	btrfs_init_dummy_trans(&trans, root->fs_info);
-- 
2.37.3