+ switch (type) {
+ case XFS_AG_RESV_RMAPBT:
+ /*
+ * Space taken by the rmapbt is not subtracted from fdblocks
+ * because the rmapbt lives in the free space. Here we must
+ * subtract the entire reservation from fdblocks so that we
+ * always have blocks available for rmapbt expansion.
+ */
+ hidden_space = ask;
+ break;
+ case XFS_AG_RESV_METADATA:
+ /*
+ * Space taken by all other metadata btrees are accounted
+ * on-disk as used space. We therefore only hide the space
+ * that is reserved but not used by the trees.
+ */
+ hidden_space = ask - used;
+ break;
+ default:
+ ASSERT(0);
+ return -EINVAL;
+ }
+ error = xfs_mod_fdblocks(mp, -(int64_t)hidden_space, true);