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

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Date:	Mon, 14 Feb 2011 23:12:08 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
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, 14 Feb 2011, Trond Myklebust wrote:

> 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).
> 
Ouch, I completely misread/misunderstood that. Thanks for the 
clarification and please ignore the patch...

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
Plain text mails only, please.
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