From patchwork Tue Jan 17 22:00:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paulo Alcantara X-Patchwork-Id: 13105139 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15039C00A5A for ; Tue, 17 Jan 2023 22:23:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229704AbjAQWXw (ORCPT ); Tue, 17 Jan 2023 17:23:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60914 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230126AbjAQWVL (ORCPT ); Tue, 17 Jan 2023 17:21:11 -0500 Received: from mx.cjr.nz (mx.cjr.nz [51.158.111.142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9962261882 for ; Tue, 17 Jan 2023 14:00:56 -0800 (PST) Received: from authenticated-user (mx.cjr.nz [51.158.111.142]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: pc) by mx.cjr.nz (Postfix) with ESMTPSA id 2D3B080CF7; Tue, 17 Jan 2023 22:00:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cjr.nz; s=dkim; t=1673992855; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bM1gJFc+tNJJwlTFw9QEOZDd0XBC1HlF9j/fpfhnEYw=; b=mLkutIPY6KBdEis5b58fcvQ89y9e/cB/YhO6iFaj+Se1z+JiyGXm5/lxWgdueeGkkv6Usz iWTK41AVEEIhyEe0F7t8zI29Unp40FAvjcJqLB5YuzZ5scc5b1fu2QgQXGWqEbPcc9x4Mq lm16D/pdif0ZafJbM1fYWXnNXvPPNFECvKBS1bBGsn7bIG19LAWprpGw4xR7yb92j0S7bj I+vRqDcou0hrakSjo2mxTvW6ZHwE96QAPzTgSpcIZqHga+ruDkDXfaFUAU3ZI8T34qSquQ p55qmoJ9l4swIHPimPvBNN+WowGdDBYGgSgONNPRyClhiLg+toANOIaNGS2r7A== From: Paulo Alcantara To: smfrench@gmail.com Cc: linux-cifs@vger.kernel.org, aurelien.aptel@gmail.com, Paulo Alcantara Subject: [PATCH v2 2/5] cifs: avoid re-lookups in dfs_cache_find() Date: Tue, 17 Jan 2023 19:00:38 -0300 Message-Id: <20230117220041.15905-3-pc@cjr.nz> In-Reply-To: <20230117220041.15905-1-pc@cjr.nz> References: <20230117000952.9965-1-pc@cjr.nz> <20230117220041.15905-1-pc@cjr.nz> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Simply downgrade the write lock on cache updates from cache_refresh_path() and avoid unnecessary re-lookup in dfs_cache_find(). Signed-off-by: Paulo Alcantara (SUSE) --- fs/cifs/dfs_cache.c | 58 ++++++++++++++++++++++++++------------------- 1 file changed, 34 insertions(+), 24 deletions(-) diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c index a6d7ae5f49a4..755a00c4cba1 100644 --- a/fs/cifs/dfs_cache.c +++ b/fs/cifs/dfs_cache.c @@ -558,7 +558,8 @@ static void remove_oldest_entry_locked(void) } /* Add a new DFS cache entry */ -static int add_cache_entry_locked(struct dfs_info3_param *refs, int numrefs) +static struct cache_entry *add_cache_entry_locked(struct dfs_info3_param *refs, + int numrefs) { int rc; struct cache_entry *ce; @@ -573,11 +574,11 @@ static int add_cache_entry_locked(struct dfs_info3_param *refs, int numrefs) rc = cache_entry_hash(refs[0].path_name, strlen(refs[0].path_name), &hash); if (rc) - return rc; + return ERR_PTR(rc); ce = alloc_cache_entry(refs, numrefs); if (IS_ERR(ce)) - return PTR_ERR(ce); + return ce; spin_lock(&cache_ttl_lock); if (!cache_ttl) { @@ -594,7 +595,7 @@ static int add_cache_entry_locked(struct dfs_info3_param *refs, int numrefs) atomic_inc(&cache_count); - return 0; + return ce; } /* Check if two DFS paths are equal. @s1 and @s2 are expected to be in @cache_cp's charset */ @@ -767,8 +768,12 @@ static int get_dfs_referral(const unsigned int xid, struct cifs_ses *ses, const * * For interlinks, cifs_mount() and expand_dfs_referral() are supposed to * handle them properly. + * + * On success, return entry with acquired lock for reading, otherwise error ptr. */ -static int cache_refresh_path(const unsigned int xid, struct cifs_ses *ses, const char *path) +static struct cache_entry *cache_refresh_path(const unsigned int xid, + struct cifs_ses *ses, + const char *path) { struct dfs_info3_param *refs = NULL; struct cache_entry *ce; @@ -780,10 +785,9 @@ static int cache_refresh_path(const unsigned int xid, struct cifs_ses *ses, cons down_read(&htable_rw_lock); ce = lookup_cache_entry(path); - if (!IS_ERR(ce) && !cache_entry_expired(ce)) { - up_read(&htable_rw_lock); - return 0; - } + if (!IS_ERR(ce) && !cache_entry_expired(ce)) + return ce; + /* * Unlock shared access as we don't want to hold any locks while getting * a new referral. The @ses used for performing the I/O could be @@ -797,8 +801,10 @@ static int cache_refresh_path(const unsigned int xid, struct cifs_ses *ses, cons * Request a new DFS referral in order to create or update a cache entry. */ rc = get_dfs_referral(xid, ses, path, &refs, &numrefs); - if (rc) + if (rc) { + ce = ERR_PTR(rc); goto out; + } dump_refs(refs, numrefs); @@ -806,16 +812,24 @@ static int cache_refresh_path(const unsigned int xid, struct cifs_ses *ses, cons /* Re-check as another task might have it added or refreshed already */ ce = lookup_cache_entry(path); if (!IS_ERR(ce)) { - if (cache_entry_expired(ce)) + if (cache_entry_expired(ce)) { rc = update_cache_entry_locked(ce, refs, numrefs); + if (rc) + ce = ERR_PTR(rc); + } } else { - rc = add_cache_entry_locked(refs, numrefs); + ce = add_cache_entry_locked(refs, numrefs); } - up_write(&htable_rw_lock); + if (IS_ERR(ce)) { + up_write(&htable_rw_lock); + goto out; + } + + downgrade_write(&htable_rw_lock); out: free_dfs_info_array(refs, numrefs); - return rc; + return ce; } /* @@ -935,15 +949,8 @@ int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses, const struct nl if (IS_ERR(npath)) return PTR_ERR(npath); - rc = cache_refresh_path(xid, ses, npath); - if (rc) - goto out_free_path; - - down_read(&htable_rw_lock); - - ce = lookup_cache_entry(npath); + ce = cache_refresh_path(xid, ses, npath); if (IS_ERR(ce)) { - up_read(&htable_rw_lock); rc = PTR_ERR(ce); goto out_free_path; } @@ -1039,10 +1046,13 @@ int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses, cifs_dbg(FYI, "%s: update target hint - path: %s\n", __func__, npath); - rc = cache_refresh_path(xid, ses, npath); - if (rc) + ce = cache_refresh_path(xid, ses, npath); + if (IS_ERR(ce)) { + rc = PTR_ERR(ce); goto out_free_path; + } + up_read(&htable_rw_lock); down_write(&htable_rw_lock); ce = lookup_cache_entry(npath);