btrfs: switch return_bigger to bool in find_ref_head

Using bool is more suitable than int here, and add the comment about the
return_bigger.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 5d8f6d5..5149165 100644 (file)
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -168,11 +168,12 @@ static struct btrfs_delayed_ref_node* tree_insert(struct rb_root_cached *root,
  * find an head entry based on bytenr. This returns the delayed ref
  * head if it was able to find one, or NULL if nothing was in that spot.
  * If return_bigger is given, the next bigger entry is returned if no exact
- * match is found.
+ * match is found. But if no bigger one is found then the first node of the
+ * ref head tree will be returned.
  */
 static struct btrfs_delayed_ref_head* find_ref_head(
                struct btrfs_delayed_ref_root *dr, u64 bytenr,
-               int return_bigger)
+               bool return_bigger)
 {
        struct rb_root *root = &dr->href_root.rb_root;
        struct rb_node *n;
@@ -359,12 +360,12 @@ struct btrfs_delayed_ref_head *btrfs_select_ref_head(
 
 again:
        start = delayed_refs->run_delayed_start;
-       head = find_ref_head(delayed_refs, start, 1);
+       head = find_ref_head(delayed_refs, start, true);
        if (!head && !loop) {
                delayed_refs->run_delayed_start = 0;
                start = 0;
                loop = true;
-               head = find_ref_head(delayed_refs, start, 1);
+               head = find_ref_head(delayed_refs, start, true);
                if (!head)
                        return NULL;
        } else if (!head && loop) {
@@ -905,7 +906,7 @@ int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
 struct btrfs_delayed_ref_head *
 btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, u64 bytenr)
 {
-       return find_ref_head(delayed_refs, bytenr, 0);
+       return find_ref_head(delayed_refs, bytenr, false);
 }
 
 void __cold btrfs_delayed_ref_exit(void)