btrfs: simplify btrfs_should_throttle_delayed_refs()

Currently btrfs_should_throttle_delayed_refs() returns 1 or 2 in case the
delayed refs should be throttled, however the only caller (inode eviction
and truncation path) does not care about those two different conditions,
it treats the return value as a boolean. This allows us to remove one of
the conditions in btrfs_should_throttle_delayed_refs() and change its
return value from 'int' to 'bool'. So just do that.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/delayed-ref.c

@@ -53,7 +53,7 @@ bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info)
 	return ret;
 }
 
-int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans)
+bool btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans)
 {
 	u64 num_entries =
 		atomic_read(&trans->transaction->delayed_refs.num_entries);
@@ -63,10 +63,8 @@ int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans)
 	smp_mb();
 	avg_runtime = trans->fs_info->avg_delayed_ref_runtime;
 	val = num_entries * avg_runtime;
-	if (val >= NSEC_PER_SEC)
-		return 1;
 	if (val >= NSEC_PER_SEC / 2)
-		return 2;
+		return true;
 
 	return btrfs_check_space_for_delayed_refs(trans->fs_info);
 }

fs/btrfs/delayed-ref.h

@@ -385,7 +385,7 @@ int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
 void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
 				       struct btrfs_block_rsv *src,
 				       u64 num_bytes);
-int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans);
+bool btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans);
 bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info);
 
 /*