On Wed, Apr 01, 2009 at 07:28:13AM +1100, Greg Banks wrote:
> Make REQHASH() an inline function. Rename hash_list to cache_hash.
> Fix an obsolete comment.
OK--applying for 2.6.31.--b.
>
> Signed-off-by: Greg Banks <gnb@xxxxxxx>
> ---
>
> fs/nfsd/nfscache.c | 29 +++++++++++++++++++----------
> include/linux/nfsd/cache.h | 3 +--
> 2 files changed, 20 insertions(+), 12 deletions(-)
>
> Index: bfields/fs/nfsd/nfscache.c
> ===================================================================
> --- bfields.orig/fs/nfsd/nfscache.c
> +++ bfields/fs/nfsd/nfscache.c
> @@ -29,15 +29,24 @@
> */
> #define CACHESIZE 1024
> #define HASHSIZE 64
> -#define REQHASH(xid) (((((__force __u32)xid) >> 24) ^ ((__force __u32)xid)) & (HASHSIZE-1))
>
> -static struct hlist_head * hash_list;
> +static struct hlist_head * cache_hash;
> static struct list_head lru_head;
> static int cache_disabled = 1;
>
> +/*
> + * Calculate the hash index from an XID.
> + */
> +static inline u32 request_hash(u32 xid)
> +{
> + u32 h = xid;
> + h ^= (xid >> 24);
> + return h & (HASHSIZE-1);
> +}
> +
> static int nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *vec);
>
> -/*
> +/*
> * locking for the reply cache:
> * A cache entry is "single use" if c_state == RC_INPROG
> * Otherwise, it when accessing _prev or _next, the lock must be held.
> @@ -62,8 +71,8 @@ int nfsd_reply_cache_init(void)
> i--;
> }
>
> - hash_list = kcalloc (HASHSIZE, sizeof(struct hlist_head), GFP_KERNEL);
> - if (!hash_list)
> + cache_hash = kcalloc (HASHSIZE, sizeof(struct hlist_head), GFP_KERNEL);
> + if (!cache_hash)
> goto out_nomem;
>
> cache_disabled = 0;
> @@ -88,8 +97,8 @@ void nfsd_reply_cache_shutdown(void)
>
> cache_disabled = 1;
>
> - kfree (hash_list);
> - hash_list = NULL;
> + kfree (cache_hash);
> + cache_hash = NULL;
> }
>
> /*
> @@ -108,7 +117,7 @@ static void
> hash_refile(struct svc_cacherep *rp)
> {
> hlist_del_init(&rp->c_hash);
> - hlist_add_head(&rp->c_hash, hash_list + REQHASH(rp->c_xid));
> + hlist_add_head(&rp->c_hash, cache_hash + request_hash(rp->c_xid));
> }
>
> /*
> @@ -138,7 +147,7 @@ nfsd_cache_lookup(struct svc_rqst *rqstp
> spin_lock(&cache_lock);
> rtn = RC_DOIT;
>
> - rh = &hash_list[REQHASH(xid)];
> + rh = &cache_hash[request_hash(xid)];
> hlist_for_each_entry(rp, hn, rh, c_hash) {
> if (rp->c_state != RC_UNUSED &&
> xid == rp->c_xid && proc == rp->c_proc &&
> @@ -264,7 +273,7 @@ nfsd_cache_update(struct svc_rqst *rqstp
>
> len = resv->iov_len - ((char*)statp - (char*)resv->iov_base);
> len >>= 2;
> -
> +
> /* Don't cache excessive amounts of data and XDR failures */
> if (!statp || len > (256 >> 2)) {
> rp->c_state = RC_UNUSED;
> Index: bfields/include/linux/nfsd/cache.h
> ===================================================================
> --- bfields.orig/include/linux/nfsd/cache.h
> +++ bfields/include/linux/nfsd/cache.h
> @@ -14,8 +14,7 @@
> #include <linux/uio.h>
>
> /*
> - * Representation of a reply cache entry. The first two members *must*
> - * be hash_next and hash_prev.
> + * Representation of a reply cache entry.
> */
> struct svc_cacherep {
> struct hlist_node c_hash;
>
> --
> Greg
--
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