linux-kernel - Re: [patch 02/12] fuse: fix race between getattr and write

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Date:	Thu, 4 Oct 2007 15:43:48 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-kernel@...r.kernel.org, jakub.bogusz@...ius.pl
Subject: Re: [patch 02/12] fuse: fix race between getattr and write

On Tue, 02 Oct 2007 17:50:28 +0200
Miklos Szeredi <miklos@...redi.hu> wrote:

> @@ -228,6 +243,7 @@ static struct dentry *fuse_lookup(struct
>  	struct fuse_conn *fc = get_fuse_conn(dir);
>  	struct fuse_req *req;
>  	struct fuse_req *forget_req;
> +	u64 attr_version;
>  
>  	if (entry->d_name.len > FUSE_NAME_MAX)
>  		return ERR_PTR(-ENAMETOOLONG);
> @@ -242,6 +258,10 @@ static struct dentry *fuse_lookup(struct
>  		return ERR_PTR(PTR_ERR(forget_req));
>  	}
>  
> +	spin_lock(&fc->lock);
> +	attr_version = fc->attr_version;
> +	spin_unlock(&fc->lock);

You might want to do this (oft-repeated) operation in a little helper
function.

Because I suspect that the lock isn't needed if CONFIG_64BIT=y.
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