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Date:   Mon, 7 Dec 2020 18:14:56 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Christian Brauner <christian.brauner@ubuntu.com>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Christoph Hellwig <hch@infradead.org>,
        linux-fsdevel@vger.kernel.org,
        John Johansen <john.johansen@canonical.com>,
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Subject: Re: [PATCH v4 06/40] fs: add mount_setattr()
Message-ID: <20201207171456.GC13614@lst.de>
References: <20201203235736.3528991-1-christian.brauner@ubuntu.com> <20201203235736.3528991-7-christian.brauner@ubuntu.com>
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> +	switch (attr->propagation) {
> +	case 0:
> +		kattr->propagation = 0;
> +		break;
> +	case MS_UNBINDABLE:
> +		kattr->propagation = MS_UNBINDABLE;
> +		break;
> +	case MS_PRIVATE:
> +		kattr->propagation = MS_PRIVATE;
> +		break;
> +	case MS_SLAVE:
> +		kattr->propagation = MS_SLAVE;
> +		break;
> +	case MS_SHARED:
> +		kattr->propagation = MS_SHARED;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}

This can be shortened to:

#define MOUNT_SETATTR_PROPAGATION_FLAGS \
	(MS_UNBINDABLE | MS_PRIVATE | MS_SLAVE | MS_SHARED)

	if (attr->propagation & ~MOUNT_SETATTR_PROPAGATION_FLAGS)
		return -EINVAL;
	if (hweight32(attr->propagation & MOUNT_SETATTR_PROPAGATION_FLAGS) > 1)
		return -EINVAL;
	kattr->propagation = attr->propagation;

> +asmlinkage long sys_mount_setattr(int dfd, const char __user *path, unsigned int flags,

Overly long line.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>