return list_entry(p->mnt_slave.next, struct vfsmount, mnt_slave);
}
-/*
- * Return true if path is reachable from root
- *
- * namespace_sem is held, and mnt is attached
- */
-static bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,
- const struct path *root)
-{
- while (mnt != root->mnt && mnt->mnt_parent != mnt) {
- dentry = mnt->mnt_mountpoint;
- mnt = mnt->mnt_parent;
- }
- return mnt == root->mnt && is_subdir(dentry, root->dentry);
-}
-
-static struct vfsmount *get_peer_under_root(struct vfsmount *mnt,
- struct mnt_namespace *ns,
- const struct path *root)
+static struct mount *get_peer_under_root(struct mount *mnt,
+ struct mnt_namespace *ns,
+ const struct path *root)
{
- struct vfsmount *m = mnt;
+ struct mount *m = mnt;
do {
/* Check the namespace first for optimization */
- if (m->mnt_ns == ns && is_path_reachable(m, m->mnt_root, root))
+ if (m->mnt.mnt_ns == ns && is_path_reachable(m, m->mnt.mnt_root, root))
return m;
- m = next_peer(m);
+ m = real_mount(next_peer(&m->mnt));
} while (m != mnt);
return NULL;
*
* Caller must hold namespace_sem
*/
-int get_dominating_id(struct vfsmount *mnt, const struct path *root)
+int get_dominating_id(struct mount *mnt, const struct path *root)
{
- struct vfsmount *m;
+ struct mount *m;
- for (m = mnt->mnt_master; m != NULL; m = m->mnt_master) {
- struct vfsmount *d = get_peer_under_root(m, mnt->mnt_ns, root);
+ for (m = real_mount(mnt->mnt.mnt_master); m != NULL; m = real_mount(m->mnt.mnt_master)) {
+ struct mount *d = get_peer_under_root(m, mnt->mnt.mnt_ns, root);
if (d)
- return d->mnt_group_id;
+ return d->mnt.mnt_group_id;
}
return 0;
}
-static int do_make_slave(struct vfsmount *mnt)
+static int do_make_slave(struct mount *mnt)
{
- struct vfsmount *peer_mnt = mnt, *master = mnt->mnt_master;
+ struct mount *peer_mnt = mnt, *master = real_mount(mnt->mnt.mnt_master);
struct vfsmount *slave_mnt;
/*
* 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_root != mnt->mnt_root) ;
+ while ((peer_mnt = real_mount(next_peer(&peer_mnt->mnt))) != mnt &&
+ peer_mnt->mnt.mnt_root != mnt->mnt.mnt_root) ;
if (peer_mnt == mnt) {
- peer_mnt = next_peer(mnt);
+ peer_mnt = real_mount(next_peer(&mnt->mnt));
if (peer_mnt == mnt)
peer_mnt = NULL;
}
- if (IS_MNT_SHARED(mnt) && list_empty(&mnt->mnt_share))
+ if (IS_MNT_SHARED(&mnt->mnt) && list_empty(&mnt->mnt.mnt_share))
mnt_release_group_id(mnt);
- list_del_init(&mnt->mnt_share);
- mnt->mnt_group_id = 0;
+ list_del_init(&mnt->mnt.mnt_share);
+ mnt->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);
+ list_for_each_entry(slave_mnt, &mnt->mnt.mnt_slave_list, mnt_slave)
+ slave_mnt->mnt_master = &master->mnt;
+ list_move(&mnt->mnt.mnt_slave, &master->mnt.mnt_slave_list);
+ list_splice(&mnt->mnt.mnt_slave_list, master->mnt.mnt_slave_list.prev);
+ INIT_LIST_HEAD(&mnt->mnt.mnt_slave_list);
} else {
- struct list_head *p = &mnt->mnt_slave_list;
+ struct list_head *p = &mnt->mnt.mnt_slave_list;
while (!list_empty(p)) {
slave_mnt = list_first_entry(p,
struct vfsmount, mnt_slave);
slave_mnt->mnt_master = NULL;
}
}
- mnt->mnt_master = master;
- CLEAR_MNT_SHARED(mnt);
+ mnt->mnt.mnt_master = &master->mnt;
+ CLEAR_MNT_SHARED(&mnt->mnt);
return 0;
}
/*
* vfsmount lock must be held for write
*/
-void change_mnt_propagation(struct vfsmount *mnt, int type)
+void change_mnt_propagation(struct mount *mnt, int type)
{
if (type == MS_SHARED) {
set_mnt_shared(mnt);
}
do_make_slave(mnt);
if (type != MS_SLAVE) {
- list_del_init(&mnt->mnt_slave);
- mnt->mnt_master = NULL;
+ list_del_init(&mnt->mnt.mnt_slave);
+ mnt->mnt.mnt_master = NULL;
if (type == MS_UNBINDABLE)
- mnt->mnt_flags |= MNT_UNBINDABLE;
+ mnt->mnt.mnt_flags |= MNT_UNBINDABLE;
else
- mnt->mnt_flags &= ~MNT_UNBINDABLE;
+ mnt->mnt.mnt_flags &= ~MNT_UNBINDABLE;
}
}
int propagate_mnt(struct vfsmount *dest_mnt, struct dentry *dest_dentry,
struct vfsmount *source_mnt, struct list_head *tree_list)
{
- struct vfsmount *m, *child;
+ struct vfsmount *m;
+ struct mount *child;
int ret = 0;
struct vfsmount *prev_dest_mnt = dest_mnt;
struct vfsmount *prev_src_mnt = source_mnt;
source = get_source(m, prev_dest_mnt, prev_src_mnt, &type);
- if (!(child = copy_tree(source, source->mnt_root, type))) {
+ if (!(child = copy_tree(real_mount(source), source->mnt_root, type))) {
ret = -ENOMEM;
list_splice(tree_list, tmp_list.prev);
goto out;
list_add_tail(&child->mnt_hash, &tmp_list);
}
prev_dest_mnt = m;
- prev_src_mnt = child;
+ prev_src_mnt = &child->mnt;
}
out:
br_write_lock(vfsmount_lock);
while (!list_empty(&tmp_list)) {
- child = list_first_entry(&tmp_list, struct vfsmount, mnt_hash);
+ child = list_first_entry(&tmp_list, struct mount, mnt_hash);
umount_tree(child, 0, &umount_list);
}
br_write_unlock(vfsmount_lock);
/*
* return true if the refcount is greater than count
*/
-static inline int do_refcount_check(struct vfsmount *mnt, int count)
+static inline int do_refcount_check(struct mount *mnt, int count)
{
- int mycount = mnt_get_count(mnt) - mnt->mnt_ghosts;
+ int mycount = mnt_get_count(mnt) - mnt->mnt.mnt_ghosts;
return (mycount > count);
}
*
* vfsmount lock must be held for write
*/
-int propagate_mount_busy(struct vfsmount *mnt, int refcnt)
+int propagate_mount_busy(struct mount *mnt, int refcnt)
{
- struct vfsmount *m, *child;
- struct vfsmount *parent = mnt->mnt_parent;
+ struct vfsmount *m;
+ struct mount *child;
+ struct mount *parent = mnt->mnt_parent;
int ret = 0;
if (mnt == parent)
if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt))
return 1;
- for (m = propagation_next(parent, parent); m;
- m = propagation_next(m, parent)) {
+ for (m = propagation_next(&parent->mnt, &parent->mnt); m;
+ m = propagation_next(m, &parent->mnt)) {
child = __lookup_mnt(m, mnt->mnt_mountpoint, 0);
if (child && list_empty(&child->mnt_mounts) &&
(ret = do_refcount_check(child, 1)))
* NOTE: unmounting 'mnt' naturally propagates to all other mounts its
* parent propagates to.
*/
-static void __propagate_umount(struct vfsmount *mnt)
+static void __propagate_umount(struct mount *mnt)
{
- struct vfsmount *parent = mnt->mnt_parent;
+ struct mount *parent = mnt->mnt_parent;
struct vfsmount *m;
BUG_ON(parent == mnt);
- for (m = propagation_next(parent, parent); m;
- m = propagation_next(m, parent)) {
+ for (m = propagation_next(&parent->mnt, &parent->mnt); m;
+ m = propagation_next(m, &parent->mnt)) {
- struct vfsmount *child = __lookup_mnt(m,
+ struct mount *child = __lookup_mnt(m,
mnt->mnt_mountpoint, 0);
/*
* umount the child only if the child has no
*/
int propagate_umount(struct list_head *list)
{
- struct vfsmount *mnt;
+ struct mount *mnt;
list_for_each_entry(mnt, list, mnt_hash)
__propagate_umount(mnt);
projects / firefly-linux-kernel-4.4.55.git / blobdiff