Re: [PATCH v4 06/40] fs: add mount_setattr()

From: Christoph Hellwig <hch@lst.de>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Lennart Poettering <lennart@poettering.net>,
	Mimi Zohar <zohar@linux.ibm.com>,
	David Howells <dhowells@redhat.com>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	containers@lists.linux-foundation.org,
	Christoph Hellwig <hch@lst.de>, Tycho Andersen <tycho@tycho.ws>,
	Paul Moore <paul@paul-moore.com>,
	Jonathan Corbet <corbet@lwn.net>,
	smbarber@chromium.org, Christoph Hellwig <hch@infradead.org>,
	Alban Crequy <alban@kinvolk.io>,
	linux-ext4@vger.kernel.org, Mrunal Patel <mpatel@redhat.com>,
	Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
	selinux@vger.kernel.org, Josh Triplett <josh@joshtriplett.org>,
	Seth Forshee <seth.forshee@canonical.com>,
	Aleksa Sarai <cyphar@cyphar.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andy Lutomirski <luto@kernel.org>,
	OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
	Geoffrey Thomas <geofft@ldpreload.com>,
	James Bottomley <James.Bottomley@hansenpartnership.com>,
	John Johansen <john.johansen@canonical.com>,
	Theodore Tso <tytso@mit.edu>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	Stephen Smalley <stephen.smalley.work@gmail.com>,
	linux-security-module@vger.kernel.org,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	linux-api@vger.kernel.org,
	Casey Schaufler <casey@schaufler-ca.com>,
	linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org,
	Todd Kjos <tkjos@google.com>
Subject: Re: [PATCH v4 06/40] fs: add mount_setattr()
Date: Mon, 7 Dec 2020 18:14:56 +0100	[thread overview]
Message-ID: <20201207171456.GC13614@lst.de> (raw)
In-Reply-To: <20201203235736.3528991-7-christian.brauner@ubuntu.com>

> +	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>
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