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Date: Thu, 12 Dec 2013 20:06:09 +0100 (CET)
From: Andreas Gruenbacher <andreas.gruenbacher@linbit.com>
To: Christoph Hellwig <hch@infradead.org>
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Subject: Re: [PATCH 02/18] fs: add get_acl helper
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Cc: xfs@oss.sgi.com, Jan Kara <jack@suse.cz>, Mark Fasheh <mfasheh@suse.com>,
 reiserfs-devel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net,
 cluster-devel@redhat.com, linux-mtd@lists.infradead.org,
 viro@zeniv.linux.org.uk, jfs-discussion@lists.sourceforge.net,
 linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
 linux-nfs@vger.kernel.org, linux-btrfs@vger.kernel.org,
 Joel Becker <jlbec@evilplan.org>
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Christoph,

> +struct posix_acl *get_acl(struct inode *inode, int type)
> +{
> +	struct posix_acl *acl;
> +
> +	acl = get_cached_acl(inode, type);
> +	if (acl != ACL_NOT_CACHED)
> +		return acl;
> +
> +	if (!IS_POSIXACL(inode))
> +		return NULL;
> +
> +	/*
> +	 * A filesystem can force a ACL callback by just never filling the
> +	 * ACL cache. But normally you'd fill the cache either at inode
> +	 * instantiation time, or on the first ->get_acl call.
> +	 *
> +	 * If the filesystem doesn't have a get_acl() function at all, we'll
> +	 * just create the negative cache entry.
> +	 */
> +	if (!inode->i_op->get_acl) {
> +		set_cached_acl(inode, type, NULL);
> +		return ERR_PTR(-EAGAIN);

The function should return NULL here.

Andreas