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 73e0b628e058cc28c8ae4eab030ff88f6f523d58..d39b824a780c2b48016e38370e36e039d192e90f 100644 (file)
--- 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__