+/* Downgrade if superblock is at a higher version than currently supported: */
+void bch2_sb_maybe_downgrade(struct bch_fs *c)
+{
+ lockdep_assert_held(&c->sb_lock);
+
+ /*
+ * Downgrade, if superblock is at a higher version than currently
+ * supported:
+ */
+ if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current)
+ SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
+ if (c->sb.version > bcachefs_metadata_version_current)
+ c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
+ if (c->sb.version_min > bcachefs_metadata_version_current)
+ c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
+ c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
+}
+
+void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
+{
+ lockdep_assert_held(&c->sb_lock);
+
+ c->disk_sb.sb->version = cpu_to_le16(new_version);
+ c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
+}
+