linux-ext4 - Re: [PATCH 02/18] fs: add get

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

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
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