On Fri, 20 Apr 2007 12:25:33 +0200 Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > From: Miklos Szeredi <mszeredi@xxxxxxx> > > Add ownership information to mounts. > > A new mount flag, MS_SETUSER is used to make a mount owned by a user. > If this flag is specified, then the owner will be set to the current > real user id and the mount will be marked with the MNT_USER flag. On > remount don't preserve previous owner, and treat MS_SETUSER as for a > new mount. The MS_SETUSER flag is ignored on mount move. So is a modified mount(8) needed? If so, is there some convenient way in which testers can get hold of it? > The MNT_USER flag is not copied on any kind of mount cloning: > namespace creation, binding or propagation. For bind mounts the > cloned mount(s) are set to MNT_USER depending on the MS_SETUSER mount > flag. In all the other cases MNT_USER is always cleared. > > For MNT_USER mounts a "user=UID" option is added to /proc/PID/mounts. > This is compatible with how mount ownership is stored in /etc/mtab. > > Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx> > --- > > Index: linux/fs/namespace.c > =================================================================== > --- linux.orig/fs/namespace.c 2007-04-20 11:55:02.000000000 +0200 > +++ linux/fs/namespace.c 2007-04-20 11:55:05.000000000 +0200 > @@ -227,6 +227,13 @@ static struct vfsmount *skip_mnt_tree(st > return p; > } > > +static void set_mnt_user(struct vfsmount *mnt) > +{ > + BUG_ON(mnt->mnt_flags & MNT_USER); > + mnt->mnt_uid = current->uid; > + mnt->mnt_flags |= MNT_USER; > +} I'm a bit surprised to see this. Using uids in-kernel is all rather old-fashioned and restricted. I'd have expected mnt->user = get_uid(current->user); - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html