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    Subject[patch 01/46] touch_mnt_namespace when the mount flags change
    2.6.27-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Dan Williams <dan.j.williams@intel.com>

    commit 0e55a7cca4b66f625d67b292f80b6a976e77c51b upstream

    Daemons that need to be launched while the rootfs is read-only can now
    poll /proc/mounts to be notified when their O_RDWR requests may no
    longer end in EROFS.

    Cc: Kay Sievers <kay.sievers@vrfy.org>
    Cc: Neil Brown <neilb@suse.de>
    Signed-off-by: Dan Williams <dan.j.williams@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    fs/namespace.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    --- a/fs/namespace.c
    +++ b/fs/namespace.c
    @@ -1553,8 +1553,13 @@ static noinline int do_remount(struct na
    if (!err)
    nd->path.mnt->mnt_flags = mnt_flags;
    up_write(&sb->s_umount);
    - if (!err)
    + if (!err) {
    security_sb_post_remount(nd->path.mnt, flags, data);
    +
    + spin_lock(&vfsmount_lock);
    + touch_mnt_namespace(nd->path.mnt->mnt_ns);
    + spin_unlock(&vfsmount_lock);
    + }
    return err;
    }

    --


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