linux-kernel - Re: [PATCH v2 2/2] FUSE: Retire superblock on force unmount

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Message-ID: <YoQfls6hFcP3kCaH@zeniv-ca.linux.org.uk>
Date:   Tue, 17 May 2022 22:20:06 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Daniil Lunev <dlunev@...omium.org>
Cc:     linux-fsdevel@...r.kernel.org, hch@...radead.org,
        fuse-devel@...ts.sourceforge.net, tytso@....edu, miklos@...redi.hu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] FUSE: Retire superblock on force unmount

On Thu, May 12, 2022 at 08:29:10AM +1000, Daniil Lunev wrote:
> Force unmount of FUSE severes the connection with the user space, even
> if there are still open files. Subsequent remount tries to re-use the
> superblock held by the open files, which is meaningless in the FUSE case
> after disconnect - reused super block doesn't have userspace counterpart
> attached to it and is incapable of doing any IO.

	Why not simply have those simply rejected by fuse_test_super()?
Looks like that would be much smaller and less invasive patch...
Confused...