diff options
Diffstat (limited to 'net/sunrpc/cache.c')
| -rw-r--r-- | net/sunrpc/cache.c | 31 |
1 files changed, 16 insertions, 15 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 80aff0474572..14274490f92e 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -34,7 +34,7 @@ #define RPCDBG_FACILITY RPCDBG_CACHE -static void cache_defer_req(struct cache_req *req, struct cache_head *item); +static int cache_defer_req(struct cache_req *req, struct cache_head *item); static void cache_revisit_request(struct cache_head *item); static void cache_init(struct cache_head *h) @@ -185,6 +185,7 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h); * * Returns 0 if the cache_head can be used, or cache_puts it and returns * -EAGAIN if upcall is pending, + * -ETIMEDOUT if upcall failed and should be retried, * -ENOENT if cache entry was negative */ int cache_check(struct cache_detail *detail, @@ -236,7 +237,8 @@ int cache_check(struct cache_detail *detail, } if (rv == -EAGAIN) - cache_defer_req(rqstp, h); + if (cache_defer_req(rqstp, h) != 0) + rv = -ETIMEDOUT; if (rv) cache_put(h, detail); @@ -523,14 +525,21 @@ static LIST_HEAD(cache_defer_list); static struct list_head cache_defer_hash[DFR_HASHSIZE]; static int cache_defer_cnt; -static void cache_defer_req(struct cache_req *req, struct cache_head *item) +static int cache_defer_req(struct cache_req *req, struct cache_head *item) { struct cache_deferred_req *dreq; int hash = DFR_HASH(item); + if (cache_defer_cnt >= DFR_MAX) { + /* too much in the cache, randomly drop this one, + * or continue and drop the oldest below + */ + if (net_random()&1) + return -ETIMEDOUT; + } dreq = req->defer(req); if (dreq == NULL) - return; + return -ETIMEDOUT; dreq->item = item; dreq->recv_time = get_seconds(); @@ -546,17 +555,8 @@ static void cache_defer_req(struct cache_req *req, struct cache_head *item) /* it is in, now maybe clean up */ dreq = NULL; if (++cache_defer_cnt > DFR_MAX) { - /* too much in the cache, randomly drop - * first or last - */ - if (net_random()&1) - dreq = list_entry(cache_defer_list.next, - struct cache_deferred_req, - recent); - else - dreq = list_entry(cache_defer_list.prev, - struct cache_deferred_req, - recent); + dreq = list_entry(cache_defer_list.prev, + struct cache_deferred_req, recent); list_del(&dreq->recent); list_del(&dreq->hash); cache_defer_cnt--; @@ -571,6 +571,7 @@ static void cache_defer_req(struct cache_req *req, struct cache_head *item) /* must have just been validated... */ cache_revisit_request(item); } + return 0; } static void cache_revisit_request(struct cache_head *item) |