Commit d4b20733 authored by Nikolay Borisov's avatar Nikolay Borisov Committed by David Sterba
Browse files

btrfs: Streamline shared ref check in alloc_reserved_tree_block 



Instead of setting "parent" to ref->parent only when dealing with
a shared ref and subsequently performing another check to see
if (parent > 0), check the "node->type" directly and act accordingly.
This makes the code more streamline. No functional changes.

Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 21ebfbe7

fs/btrfs/extent-tree.c

+2 −8
Original line number Diff line number Diff line
@@ -8143,17 +8143,11 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, 
	struct btrfs_delayed_tree_ref *ref;

	u32 size = sizeof(*extent_item) + sizeof(*iref);

	u64 num_bytes;

	u64 parent;

	u64 flags = extent_op->flags_to_set;

	bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);



	ref = btrfs_delayed_node_to_tree_ref(node);



	if (node->type == BTRFS_SHARED_BLOCK_REF_KEY)

		parent = ref->parent;

	else

		parent = 0;



	extent_key.objectid = node->bytenr;

	if (skinny_metadata) {

		extent_key.offset = ref->level;
@@ -8202,11 +8196,11 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, 
		iref = (struct btrfs_extent_inline_ref *)(block_info + 1);

	}



	if (parent > 0) {

	if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) {

		BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF));

		btrfs_set_extent_inline_ref_type(leaf, iref,

						 BTRFS_SHARED_BLOCK_REF_KEY);

		btrfs_set_extent_inline_ref_offset(leaf, iref, parent);

		btrfs_set_extent_inline_ref_offset(leaf, iref, ref->parent);

	} else {

		btrfs_set_extent_inline_ref_type(leaf, iref,

						 BTRFS_TREE_BLOCK_REF_KEY);

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