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    Subject[RFC][PATCH 3/15] Add the whiteout file type
    From: Jan Blunck <j.blunck@tu-harburg.de>
    Subject: Add the whiteout file type

    A white-out stops the VFS from further lookups of the white-outs 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 with this file type.

    Signed-off-by: Jan Blunck <j.blunck@tu-harburg.de>
    Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
    ---
    include/linux/stat.h | 2 ++
    1 files 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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