linux-kernel - Re: [PATCH 1/7] nfsd: remove unused get_new

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Message-ID: <20130305200511.GB15816@fieldses.org>
Date:	Tue, 5 Mar 2013 15:05:11 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	jackm@....mellanox.co.il, ogerlitz@...lanox.com,
	roland@...estorage.com, dan.magenheimer@...cle.com,
	gregkh@...uxfoundation.org, vjaquez@...lia.com,
	rene.sapiens@...com, x0095078@...com, omar.ramirez@...com,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH 1/7] nfsd: remove unused get_new_stid()

On Tue, Mar 05, 2013 at 12:02:46PM -0800, Tejun Heo wrote:
> get_new_stid() is no longer used since 3abdb607125 ("nfsd4: simplify
> idr allocation").  Remove it.

Whoops, thanks for catching that.

Acked-by: J. Bruce Fields <bfields@...hat.com>

> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: "J. Bruce Fields" <bfields@...ldses.org>
> Cc: linux-nfs@...r.kernel.org
> ---
>  fs/nfsd/nfs4state.c | 31 -------------------------------
>  1 file changed, 31 deletions(-)
> 
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 16d39c6..d91d6db 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -230,37 +230,6 @@ static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
>  		__nfs4_file_put_access(fp, oflag);
>  }
>  
> -static inline int get_new_stid(struct nfs4_stid *stid)
> -{
> -	static int min_stateid = 0;
> -	struct idr *stateids = &stid->sc_client->cl_stateids;
> -	int new_stid;
> -	int error;
> -
> -	error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
> -	/*
> -	 * Note: the necessary preallocation was done in
> -	 * nfs4_alloc_stateid().  The idr code caps the number of
> -	 * preallocations that can exist at a time, but the state lock
> -	 * prevents anyone from using ours before we get here:
> -	 */
> -	WARN_ON_ONCE(error);
> -	/*
> -	 * It shouldn't be a problem to reuse an opaque stateid value.
> -	 * I don't think it is for 4.1.  But with 4.0 I worry that, for
> -	 * example, a stray write retransmission could be accepted by
> -	 * the server when it should have been rejected.  Therefore,
> -	 * adopt a trick from the sctp code to attempt to maximize the
> -	 * amount of time until an id is reused, by ensuring they always
> -	 * "increase" (mod INT_MAX):
> -	 */
> -
> -	min_stateid = new_stid+1;
> -	if (min_stateid == INT_MAX)
> -		min_stateid = 0;
> -	return new_stid;
> -}
> -
>  static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
>  kmem_cache *slab)
>  {
> -- 
> 1.8.1.4
> 
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