linux-kernel - Re: [PATCH] NFS: Zap entire 'struct inode' in nfs_zap_caches

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Date:	Mon, 14 Feb 2011 17:09:45 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFS: Zap entire 'struct inode' in
 nfs_zap_caches_locked().

On Mon, 2011-02-14 at 22:56 +0100, Jesper Juhl wrote: 
> nfs_zap_caches_locked() attempts to zero all of the 'struct inode' that's 
> passed in via the pointer variable 'inode'. Unfortunately it only manages 
> to zero the size of a 'pointer to struct inode'. Fix that.
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>
> ---
>  inode.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
>  compile tested only
> 
> diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
> index 1cc600e..6c4236e 100644
> --- a/fs/nfs/inode.c
> +++ b/fs/nfs/inode.c
> @@ -145,7 +145,7 @@ static void nfs_zap_caches_locked(struct inode *inode)
>  	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
>  	nfsi->attrtimeo_timestamp = jiffies;
>  
> -	memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
> +	memset(NFS_COOKIEVERF(inode), 0, sizeof(*NFS_COOKIEVERF(inode)));
>  	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
>  		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
>  	else

That's incorrect.

NFS_COOKIEVERF(inode) expands to NFS_I(inode)->cookieverf, and since
cookieverf is declared inside the struct nfs_inode as 

	u32	cookieverf[2];

the sizeof(NFS_I(inode)->cookieverf) should expand to the size of the
cookieverf array (i.e. 8 bytes).

Cheers
  Trond

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com

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