fs: reserve fallocate flag codepoint
As discussed at the Plumber's Conference, reserve the bit 0x04 in
fallocate() to prevent collisions with a commonly used out-of-tree
patch which implements the no-hide-stale feature.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/include/linux/falloc.h b/include/linux/falloc.h
index 73e0b62..d39b824 100644
--- a/include/linux/falloc.h
+++ b/include/linux/falloc.h
@@ -3,6 +3,7 @@
#define FALLOC_FL_KEEP_SIZE 0x01 /* default is extend size */
#define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */
+#define FALLOC_FL_NO_HIDE_STALE 0x04 /* reserved codepoint */
#ifdef __KERNEL__