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-rw-r--r--fs/debugfs/internal.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/debugfs/internal.h b/fs/debugfs/internal.h
index 0eea99432840..cb1e8139c398 100644
--- a/fs/debugfs/internal.h
+++ b/fs/debugfs/internal.h
@@ -25,4 +25,12 @@ struct debugfs_fsdata {
struct completion active_users_drained;
};
+/*
+ * A dentry's ->d_fsdata either points to the real fops or to a
+ * dynamically allocated debugfs_fsdata instance.
+ * In order to distinguish between these two cases, a real fops
+ * pointer gets its lowest bit set.
+ */
+#define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)
+
#endif /* _DEBUGFS_INTERNAL_H_ */