linux-kernel - Re: [PATCH 03/41] VFS: Make lookup

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Message-Id: <200911300604.nAU64D0s021921@agora.fsl.cs.sunysb.edu>
Date:	Mon, 30 Nov 2009 01:04:13 -0500
From:	Erez Zadok <ezk@...sunysb.edu>
To:	Valerie Aurora <vaurora@...hat.com>
Cc:	Jan Blunck <jblunck@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Whitcroft <apw@...onical.com>,
	Scott James Remnant <scott@...onical.com>,
	Sandu Popa Marius <sandupopamarius@...il.com>,
	Jan Rekorajski <baggins@...h.mimuw.edu.pl>,
	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	Arnd Bergmann <arnd@...db.de>,
	Vladimir Dronnikov <dronnikov@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/41] VFS: Make lookup_hash() return a struct path 

In message <1256152779-10054-4-git-send-email-vaurora@...hat.com>, Valerie Aurora writes:

> @@ -1937,7 +1942,8 @@ EXPORT_SYMBOL(filp_open);
>   */
>  struct dentry *lookup_create(struct nameidata *nd, int is_dir)
>  {
> -	struct dentry *dentry = ERR_PTR(-EEXIST);
> +	struct path path = { .dentry = ERR_PTR(-EEXIST) } ;

I assume the compiler will initialize path.mnt to NULL.  Is NULL what you
want?  Even if the compiler guarantees it, I think you should either
explicitly init .mnt to NULL or leave a comment explaining what's going on
-- so no future code reader will think that this was omitted; a comment can
clarify your intentions more explicitly.

A struct path often requires both .mnt and .dentry to be set; it's not like,
say, inode_operations, where clearly some fields can be initialized to NULL
just fine.

Erez.
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