1 files changed, 14 insertions, 0 deletions

diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h
index 5ff562ddac0b..d1197ae3723c 100644
--- a/include/uapi/linux/falloc.h
+++ b/include/uapi/linux/falloc.h
@@ -27,4 +27,18 @@
  */
 #define FALLOC_FL_COLLAPSE_RANGE        0x08
 
+/*
+ * FALLOC_FL_ZERO_RANGE is used to convert a range of file to zeros preferably
+ * without issuing data IO. Blocks should be preallocated for the regions that
+ * span holes in the file, and the entire range is preferable converted to
+ * unwritten extents - even though file system may choose to zero out the
+ * extent or do whatever which will result in reading zeros from the range
+ * while the range remains allocated for the file.
+ *
+ * This can be also used to preallocate blocks past EOF in the same way as
+ * with fallocate. Flag FALLOC_FL_KEEP_SIZE should cause the inode
+ * size to remain the same.
+ */
+#define FALLOC_FL_ZERO_RANGE            0x10
+
 #endif /* _UAPI_FALLOC_H_ */