Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
>
> v2: Always drop the lock when exiting early.
> v3: Make detach_mounts robust about freeing several
> mounts on the same mountpoint at one time, and remove
> the unneeded mnt_list list test.
>
> Signed-off-by: Eric W. Biederman <ebiederman@xxxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
> ---
> fs/mount.h | 1 +
> fs/namespace.c | 24 ++++++++++++++++++++++++
> 2 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/fs/mount.h b/fs/mount.h
> index e4342b8dfab1..7a6a2bb3f290 100644
> --- a/fs/mount.h
> +++ b/fs/mount.h
> @@ -79,6 +79,7 @@ static inline int is_mounted(struct vfsmount *mnt)
> }
>
> extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
> +extern void detach_mounts(struct dentry *dentry);
>
> static inline void get_mnt_ns(struct mnt_namespace *ns)
> {
> diff --git a/fs/namespace.c b/fs/namespace.c
> index e4fe22c23e00..78f7c5c9e673 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -1295,6 +1295,30 @@ static int do_umount(struct mount *mnt, int flags)
> return retval;
> }
>
> +void detach_mounts(struct dentry *dentry)
> +{
> + struct mountpoint *mp;
> + struct mount *mnt;
> +
> + namespace_lock();
> + if (!d_mountpoint(dentry))
> + goto out_unlock;
> +
> + mp = new_mountpoint(dentry);
> + if (IS_ERR(mp))
> + goto out_unlock;
> +
> + br_write_lock(&vfsmount_lock);
> + while (!list_empty(&mp->m_list)) {
> + mnt = list_first_entry(&mp->m_list, struct mount, mnt_mp_list);
> + umount_tree(mnt, 1);
> + }
> + br_write_unlock(&vfsmount_lock);
> + put_mountpoint(mp);
> +out_unlock:
> + namespace_unlock();
> +}
> +
> /*
> * Is the caller allowed to modify his namespace?
> */
> --
> 1.7.5.4
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