linux-kernel - Re: [RFC PATCH] Introduce filesystem type tracking

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Date:	Wed, 21 May 2008 11:42:19 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Tom Spink <tspink@...il.com>
cc:	Matthew Wilcox <matthew@....cx>,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] Introduce filesystem type tracking


On Tuesday 2008-05-20 23:08, Tom Spink wrote:
>
>I *think* I may have got it right, but please, let me know what you
>think!  The only thing that I think may be wrong with this patch is
>the
>spin_lock/unlock at the end of sget, where the superblock is
>list_add_tailed into the super_blocks list.  I believe this opens the
>possibility for the same superblock being list_add_tailed twice... can
>anyone else see this code-path, and is it a problem?
>
>+	mutex_lock(&type->fs_supers_lock);
>+	if (list_empty(&type->fs_supers) && type->init) {
>+		err = type->init();
>+		if (err) {

The filesystem may want to have the superblock passed.
Well, will see once a filesystem has the need for it.

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