diff options
| -rw-r--r-- | fs/namespace.c | 11 | ||||
| -rw-r--r-- | fs/pnode.h | 1 |
2 files changed, 9 insertions, 3 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 207c7ba84ad3..4dfcaf05d17c 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -786,7 +786,7 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root, if (!mnt) return ERR_PTR(-ENOMEM); - if (flag & (CL_SLAVE | CL_PRIVATE)) + if (flag & (CL_SLAVE | CL_PRIVATE | CL_SHARED_TO_SLAVE)) mnt->mnt_group_id = 0; /* not a peer of original */ else mnt->mnt_group_id = old->mnt_group_id; @@ -807,7 +807,8 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root, list_add_tail(&mnt->mnt_instance, &sb->s_mounts); br_write_unlock(&vfsmount_lock); - if (flag & CL_SLAVE) { + if ((flag & CL_SLAVE) || + ((flag & CL_SHARED_TO_SLAVE) && IS_MNT_SHARED(old))) { list_add(&mnt->mnt_slave, &old->mnt_slave_list); mnt->mnt_master = old; CLEAR_MNT_SHARED(mnt); @@ -2331,6 +2332,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns, struct mount *p, *q; struct mount *old = mnt_ns->root; struct mount *new; + int copy_flags; new_ns = alloc_mnt_ns(user_ns); if (IS_ERR(new_ns)) @@ -2338,7 +2340,10 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns, down_write(&namespace_sem); /* First pass: copy the tree topology */ - new = copy_tree(old, old->mnt.mnt_root, CL_COPY_ALL | CL_EXPIRE); + copy_flags = CL_COPY_ALL | CL_EXPIRE; + if (user_ns != mnt_ns->user_ns) + copy_flags |= CL_SHARED_TO_SLAVE; + new = copy_tree(old, old->mnt.mnt_root, copy_flags); if (IS_ERR(new)) { up_write(&namespace_sem); free_mnt_ns(new_ns); diff --git a/fs/pnode.h b/fs/pnode.h index 65c60979d541..19b853a3445c 100644 --- a/fs/pnode.h +++ b/fs/pnode.h @@ -22,6 +22,7 @@ #define CL_COPY_ALL 0x04 #define CL_MAKE_SHARED 0x08 #define CL_PRIVATE 0x10 +#define CL_SHARED_TO_SLAVE 0x20 static inline void set_mnt_shared(struct mount *mnt) { |