Return-Path: Received: from mail-pa0-f54.google.com ([209.85.220.54]:32945 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751885AbbGKMvZ (ORCPT ); Sat, 11 Jul 2015 08:51:25 -0400 Message-ID: <55A11141.3050806@gmail.com> Date: Sat, 11 Jul 2015 20:51:13 +0800 From: Kinglong Mee MIME-Version: 1.0 To: Al Viro , "J. Bruce Fields" , "linux-nfs@vger.kernel.org" , linux-fsdevel@vger.kernel.org CC: NeilBrown , Trond Myklebust , kinglongmee@gmail.com Subject: [PATCH 08/10 v7] sunrpc: New helper cache_delete_entry for deleting cache_head directly References: <55A11010.6050005@gmail.com> In-Reply-To: <55A11010.6050005@gmail.com> Content-Type: text/plain; charset=utf-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: A new helper cache_delete_entry() for delete cache_head from cache_detail directly. It will be used by pin_kill, so make sure the cache_detail is valid before deleting is needed. Because pin_kill is not many times, so the influence of performance is accepted. v7, same as v6. Signed-off-by: Kinglong Mee --- include/linux/sunrpc/cache.h | 1 + net/sunrpc/cache.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index ecc0ff6..5a4b921 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -210,6 +210,7 @@ extern int cache_check(struct cache_detail *detail, struct cache_head *h, struct cache_req *rqstp); extern void cache_flush(void); extern void cache_purge(struct cache_detail *detail); +extern void cache_delete_entry(struct cache_detail *cd, struct cache_head *h); #define NEVER (0x7FFFFFFF) extern void __init cache_initialize(void); extern int cache_register_net(struct cache_detail *cd, struct net *net); diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index ad2155c..8a27483 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -458,6 +458,36 @@ static int cache_clean(void) return rv; } +void cache_delete_entry(struct cache_detail *detail, struct cache_head *h) +{ + struct cache_detail *tmp; + + if (!detail || !h) + return; + + spin_lock(&cache_list_lock); + list_for_each_entry(tmp, &cache_list, others) { + if (tmp == detail) + goto found; + } + spin_unlock(&cache_list_lock); + printk(KERN_WARNING "%s: Deleted cache detail %p\n", __func__, detail); + return ; + +found: + write_lock(&detail->hash_lock); + + list_del_init(&h->cache_list); + detail->entries--; + set_bit(CACHE_CLEANED, &h->flags); + + write_unlock(&detail->hash_lock); + spin_unlock(&cache_list_lock); + + cache_put(h, detail); +} +EXPORT_SYMBOL_GPL(cache_delete_entry); + /* * We want to regularly clean the cache, so we need to schedule some work ... */ -- 2.4.3