[RFC 09/26] linux/stat.h: Add the filetype white-out

[Jan Blunck]

A white-out stops the VFS from further lookups of the white-out's name and
returns -ENOENT. This is the same behaviour as if the filename isn't
found. This can be used in combination with union mounts to virtually
delete (white-out) files by creating a file of this file type.

Signed-off-by: Jan Blunck <jblunck@xxxxxxx>
---
 include/linux/stat.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/linux/stat.h
+++ b/include/linux/stat.h
@@ -10,6 +10,7 @@
 #if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
 
 #define S_IFMT  00170000
+#define S_IFWHT  0160000	/* whiteout */
 #define S_IFSOCK 0140000
 #define S_IFLNK	 0120000
 #define S_IFREG  0100000
@@ -28,6 +29,7 @@
 #define S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)
 #define S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)
 #define S_ISSOCK(m)	(((m) & S_IFMT) == S_IFSOCK)
+#define S_ISWHT(m)	(((m) & S_IFMT) == S_IFWHT)
 
 #define S_IRWXU 00700
 #define S_IRUSR 00400

-- 

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