mnt: Factor out unhash_mnt from detach_mnt and umount_tree
Create a function unhash_mnt that contains the common code between detach_mnt and umount_tree, and use unhash_mnt in place of the common code. This add a unncessary list_del_init(mnt->mnt_child) into umount_tree but given that mnt_child is already empty this extra line is a noop. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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@ -798,10 +798,8 @@ static void __touch_mnt_namespace(struct mnt_namespace *ns)
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/*
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* vfsmount lock must be held for write
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*/
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static void detach_mnt(struct mount *mnt, struct path *old_path)
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static void unhash_mnt(struct mount *mnt)
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{
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old_path->dentry = mnt->mnt_mountpoint;
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old_path->mnt = &mnt->mnt_parent->mnt;
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mnt->mnt_parent = mnt;
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mnt->mnt_mountpoint = mnt->mnt.mnt_root;
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list_del_init(&mnt->mnt_child);
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@ -811,6 +809,16 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
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mnt->mnt_mp = NULL;
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}
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/*
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* vfsmount lock must be held for write
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*/
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static void detach_mnt(struct mount *mnt, struct path *old_path)
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{
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old_path->dentry = mnt->mnt_mountpoint;
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old_path->mnt = &mnt->mnt_parent->mnt;
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unhash_mnt(mnt);
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}
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/*
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* vfsmount lock must be held for write
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*/
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@ -1362,15 +1370,10 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how)
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pin_insert_group(&p->mnt_umount, &p->mnt_parent->mnt, &unmounted);
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if (mnt_has_parent(p)) {
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hlist_del_init(&p->mnt_mp_list);
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put_mountpoint(p->mnt_mp);
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mnt_add_count(p->mnt_parent, -1);
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/* old mountpoint will be dropped when we can do that */
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p->mnt_ex_mountpoint = p->mnt_mountpoint;
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p->mnt_mountpoint = p->mnt.mnt_root;
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p->mnt_parent = p;
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p->mnt_mp = NULL;
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hlist_del_init_rcu(&p->mnt_hash);
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unhash_mnt(p);
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}
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change_mnt_propagation(p, MS_PRIVATE);
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}
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