linux-kernel - Re: [PATCH 03/34] teach move_mount(2) to work with OPEN_TREE

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Message-ID: <16587.1540082426@warthog.procyon.org.uk>
Date:   Sun, 21 Oct 2018 01:40:26 +0100
From:   David Howells <dhowells@...hat.com>
To:     Alan Jenkins <alan.christopher.jenkins@...il.com>
Cc:     dhowells@...hat.com, viro@...iv.linux.org.uk,
        torvalds@...ux-foundation.org, ebiederm@...ssion.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mszeredi@...hat.com
Subject: Re: [PATCH 03/34] teach move_mount(2) to work with OPEN_TREE_CLONE [ver #12]

Alan Jenkins <alan.christopher.jenkins@...il.com> wrote:

> diff --git a/fs/namespace.c b/fs/namespace.c
> index 4dfe7e23b7ee..e8d61d5f581d 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -1763,7 +1763,7 @@ void dissolve_on_fput(struct vfsmount *mnt)
>  {
>  	namespace_lock();
>  	lock_mount_hash();
> -	if (!real_mount(mnt)->mnt_ns) {
> +	if (!real_mount(mnt)->mnt_ns && !(mnt->mnt_flags & MNT_UMOUNT)) {
>  		mntget(mnt);
>  		umount_tree(real_mount(mnt), UMOUNT_CONNECTED);
>  	}
> @@ -2469,7 +2469,7 @@ static int do_move_mount(struct path *old_path, struct path *new_path)
>  	if (old->mnt_ns && !attached)
>  		goto out1;
>  
> -	if (old->mnt.mnt_flags & MNT_LOCKED)
> +	if (old->mnt.mnt_flags & (MNT_LOCKED | MNT_UMOUNT))
>  		goto out1;
>  
>  	if (old_path->dentry != old_path->mnt->mnt_root)

I've already got one of these; I'll fold in the other also.

David