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Commit 24cdc847 authored by Filipe Manana's avatar Filipe Manana Committed by Chris Mason
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Btrfs: unlock nodes earlier when inserting items in a btree 



In ctree.c:setup_items_for_insert(), we can unlock all nodes in our
path before we process the leaf (shift items and data, adjust data
offsets, etc). This allows for better btree concurrency, as we're
often holding a write lock on at least the node at level 1.

Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent d1b00a47

fs/btrfs/ctree.c

+6 −6
Original line number Diff line number Diff line
@@ -4738,6 +4738,12 @@ void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, 
	int slot;

	struct btrfs_map_token token;



	if (path->slots[0] == 0) {

		btrfs_cpu_key_to_disk(&disk_key, cpu_key);

		fixup_low_keys(root, path, &disk_key, 1);

	}

	btrfs_unlock_up_safe(path, 1);



	btrfs_init_map_token(&token);



	leaf = path->nodes[0];
@@ -4798,12 +4804,6 @@ void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, 
	}



	btrfs_set_header_nritems(leaf, nritems + nr);



	if (slot == 0) {

		btrfs_cpu_key_to_disk(&disk_key, cpu_key);

		fixup_low_keys(root, path, &disk_key, 1);

	}

	btrfs_unlock_up_safe(path, 1);

	btrfs_mark_buffer_dirty(leaf);



	if (btrfs_leaf_free_space(root, leaf) < 0) {