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    Subject[RFC 15/26] union-mount: Add union-mount mount flag
    Introduce MNT_UNION and MS_UNION flags. You need additional patches for
    util-linux for that to work.

    Signed-off-by: Jan Blunck <jblunck@suse.de>
    ---
    fs/namespace.c | 6 +++++-
    include/linux/fs.h | 1 +
    include/linux/mount.h | 1 +
    3 files changed, 7 insertions(+), 1 deletion(-)

    --- a/fs/namespace.c
    +++ b/fs/namespace.c
    @@ -437,6 +437,7 @@ static int show_vfsmnt(struct seq_file *
    { MNT_NODIRATIME, ",nodiratime" },
    { MNT_RELATIME, ",relatime" },
    { MNT_NOMNT, ",nomnt" },
    + { MNT_UNION, ",union" },
    { 0, NULL }
    };
    struct proc_fs_info *fs_infop;
    @@ -1558,9 +1559,12 @@ long do_mount(char *dev_name, char *dir_
    mnt_flags |= MNT_RELATIME;
    if (flags & MS_NOMNT)
    mnt_flags |= MNT_NOMNT;
    + if (flags & MS_UNION)
    + mnt_flags |= MNT_UNION;

    flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |
    - MS_NOATIME | MS_NODIRATIME | MS_RELATIME | MS_NOMNT);
    + MS_NOATIME | MS_NODIRATIME | MS_RELATIME | MS_NOMNT |
    + MS_UNION );

    /* ... and get the mountpoint */
    retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
    --- a/include/linux/fs.h
    +++ b/include/linux/fs.h
    @@ -114,6 +114,7 @@ extern int dir_notify_enable;
    #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
    #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
    #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
    +#define MS_UNION 256
    #define MS_NOATIME 1024 /* Do not update access times. */
    #define MS_NODIRATIME 2048 /* Do not update directory access times */
    #define MS_BIND 4096
    --- a/include/linux/mount.h
    +++ b/include/linux/mount.h
    @@ -36,6 +36,7 @@ struct mnt_namespace;
    #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
    #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
    #define MNT_PNODE_MASK 0x3000 /* propagation flag mask */
    +#define MNT_UNION 0x4000 /* if the vfsmount is a union mount */

    struct vfsmount {
    struct list_head mnt_hash;
    --

    -
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