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: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 20ba7c272e2db814750e5ebbf12b9027cddf6eb8..937c8eafe861834f5e949c1589b7c2d22f714c84 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -569,6 +569,20 @@ insert_new:
        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 @@ again:
                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 @@ again:
                }
                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;