static int do_make_slave(struct mount *mnt) { struct mount *peer_mnt = mnt, *master = mnt->mnt_master; struct mount *slave_mnt; /* * slave 'mnt' to a peer mount that has the * same root dentry. If none is available then * slave it to anything that is available. */ while ((peer_mnt = next_peer(peer_mnt)) != mnt && peer_mnt->mnt.mnt_root != mnt->mnt.mnt_root) ; if (peer_mnt == mnt) { peer_mnt = next_peer(mnt); if (peer_mnt == mnt) peer_mnt = NULL; } if (mnt->mnt_group_id && IS_MNT_SHARED(mnt) && list_empty(&mnt->mnt_share)) mnt_release_group_id(mnt); list_del_init(&mnt->mnt_share); mnt->mnt_group_id = 0; if (peer_mnt) master = peer_mnt; if (master) { list_for_each_entry(slave_mnt, &mnt->mnt_slave_list, mnt_slave) slave_mnt->mnt_master = master; list_move(&mnt->mnt_slave, &master->mnt_slave_list); list_splice(&mnt->mnt_slave_list, master->mnt_slave_list.prev); INIT_LIST_HEAD(&mnt->mnt_slave_list); } else { struct list_head *p = &mnt->mnt_slave_list; while (!list_empty(p)) { slave_mnt = list_first_entry(p, struct mount, mnt_slave); list_del_init(&slave_mnt->mnt_slave); slave_mnt->mnt_master = NULL; } } mnt->mnt_master = master; CLEAR_MNT_SHARED(mnt); return 0; }
static int do_make_slave(struct mount *mnt) { struct mount *master, *slave_mnt; if (list_empty(&mnt->mnt_share)) { if (IS_MNT_SHARED(mnt)) { mnt_release_group_id(mnt); CLEAR_MNT_SHARED(mnt); } master = mnt->mnt_master; if (!master) { struct list_head *p = &mnt->mnt_slave_list; while (!list_empty(p)) { slave_mnt = list_first_entry(p, struct mount, mnt_slave); list_del_init(&slave_mnt->mnt_slave); slave_mnt->mnt_master = NULL; } return 0; } } else {