kernel-patch-2.6.27

   1 touch_mnt_namespace when the mount flags change
   2
   3 From: Dan Williams <dan.j.williams@intel.com>
   4
   5 Daemons that need to be launched while the rootfs is read-only can now
   6 poll /proc/mounts to be notified when their O_RDWR requests may no
   7 longer end in EROFS.
   8
   9 Cc: Kay Sievers <kay.sievers@vrfy.org>
  10 Cc: Neil Brown <neilb@suse.de>
  11 Signed-off-by: Dan Williams <dan.j.williams@intel.com>
  12 ---
  13
  14  fs/namespace.c |    7 ++++++-
  15  1 files changed, 6 insertions(+), 1 deletions(-)
  16
  17
  18 diff --git a/fs/namespace.c b/fs/namespace.c
  19 index 6e283c9..1bd5ba2 100644
  20 --- a/fs/namespace.c
  21 +++ b/fs/namespace.c
  22 @@ -1553,8 +1553,13 @@ static noinline int do_remount(struct nameidata *nd, int flags, int mnt_flags,
  23         if (!err)
  24                 nd->path.mnt->mnt_flags = mnt_flags;
  25         up_write(&sb->s_umount);
  26 -       if (!err)
  27 +       if (!err) {
  28                 security_sb_post_remount(nd->path.mnt, flags, data);
  29 +
  30 +               spin_lock(&vfsmount_lock);
  31 +               touch_mnt_namespace(nd->path.mnt->mnt_ns);
  32 +               spin_unlock(&vfsmount_lock);
  33 +       }
  34         return err;
  35  }
  36