Commit fb8f07d2 authored by David Sterba's avatar David Sterba
Browse files

btrfs: add fast path for extent_state insertion 



In two cases the exact location where to insert the extent state is
known at the call time so we don't need to pass it to insert_state that
takes the fast path.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 6d92b304

fs/btrfs/extent_io.c

+16 −7
Original line number Diff line number Diff line
@@ -569,6 +569,20 @@ static int insert_state(struct extent_io_tree *tree, 
	return 0;

}



/*

 * Insert state to @tree to the location given by @node and @parent.

 */

static void insert_state_fast(struct extent_io_tree *tree,

			      struct extent_state *state, struct rb_node **node,

			      struct rb_node *parent, unsigned bits,

			      struct extent_changeset *changeset)

{

	set_state_bits(tree, state, bits, changeset);

	rb_link_node(&state->rb_node, parent, node);

	rb_insert_color(&state->rb_node, &tree->state);

	merge_state(tree, state);

}



/*

 * split a given extent state struct in two, inserting the preallocated

 * struct 'prealloc' as the newly created second half.  'split' indicates an
@@ -1021,10 +1035,7 @@ int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits, 
		BUG_ON(!prealloc);

		prealloc->start = start;

		prealloc->end = end;

		err = insert_state(tree, prealloc, &p, &parent, bits, changeset);

		if (err)

			extent_io_tree_panic(tree, err);



		insert_state_fast(tree, prealloc, p, parent, bits, changeset);

		cache_state(prealloc, cached_state);

		prealloc = NULL;

		goto out;
@@ -1264,9 +1275,7 @@ int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 
		}

		prealloc->start = start;

		prealloc->end = end;

		err = insert_state(tree, prealloc, &p, &parent, bits, NULL);

		if (err)

			extent_io_tree_panic(tree, err);

		insert_state_fast(tree, prealloc, p, parent, bits, NULL);

		cache_state(prealloc, cached_state);

		prealloc = NULL;

		goto out;