From patchwork Tue Apr 1 03:58:00 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chao Yu X-Patchwork-Id: 14034331 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 lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 57497C36008 for ; Tue, 1 Apr 2025 03:58:34 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-3.v29.lw.sourceforge.com) by sfs-ml-3.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1tzSlk-00083c-NO; Tue, 01 Apr 2025 03:58:32 +0000 Received: from [172.30.29.66] (helo=mx.sourceforge.net) by sfs-ml-3.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1tzSlj-00083W-6j for linux-f2fs-devel@lists.sourceforge.net; Tue, 01 Apr 2025 03:58:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=Content-Transfer-Encoding:MIME-Version:Message-ID: Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=cMr4Q+qNpowtulxHBQpkzcPBlBH/XPlra7y4M2CMyrw=; b=A7kKqj9P81jHGD8PeevMknsqTl /hXjr/XUEyFOPcz0OMXca3l5J9akqkq2EyYkyB9OZmBa316LJvn8csOdUJLDIr1NWjwv6TflNBK9A Ff0evB46baxftMrZNsx4K/HvF8KMPX0Z7o3BRR82cR0gKoZNIKTxX6meIiW2t46HMpd0=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:Cc:To:From :Sender:Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post: List-Owner:List-Archive; bh=cMr4Q+qNpowtulxHBQpkzcPBlBH/XPlra7y4M2CMyrw=; b=J 5JkQm+7Siu4wMIADf6JPB9sVFW9bX+tQ/lRVL/OIb18f/jOuKEimikjlk8EZQQUZTeRG1QqCXmLuK OqyA5kO8ZK9i4PPK9jTnjGO/670toGjes1QiDxudbBMQfC06t/tOWwgofmhEpNMceA+FMed5iF5f8 dpFOF5wGfrv22Pk0=; Received: from nyc.source.kernel.org ([147.75.193.91]) by sfi-mx-2.v28.lw.sourceforge.com with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.95) id 1tzSlS-0007gr-UV for linux-f2fs-devel@lists.sourceforge.net; Tue, 01 Apr 2025 03:58:30 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 1FDCDA43F84; Tue, 1 Apr 2025 03:52:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69AD6C4CEE8; Tue, 1 Apr 2025 03:58:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1743479888; bh=1TBiipQ5bL3J8DK3rX68uUimSVJ9/Yx0mbLiTLmPbCs=; h=From:To:Cc:Subject:Date:From; b=HBqiZ59IMke7Ae8d77JCZKlnF4hSWguWaWKFK960kMTJax6OQ8VyN45A8qIiZBaob FAZbY6evlq16Z+6eDYddOhgZ97yrrtZwJXX2nJqQ0vWVE2TaLOPtqyw8e6jUeTNGS5 QETngR8aEy40RXFzqV0qh293cKrAiRiwwtwXoEw/VH4BggX0pifu81/nS6f66l9cLx LAcbTsf4aSD8D9gORa7rCzewH8OmTIbzQjAUBD8BnHK+gR4he+ixYly92eDbe8XcGg mSBTfbmP5rWCcZojoB0eCzbu4UlzVB5Dnbf8Vlaq/VqV3ueCDVj+ZvTT2CH8Tbyf7D ECAu9DQr9Ueww== To: jaegeuk@kernel.org Date: Tue, 1 Apr 2025 11:58:00 +0800 Message-ID: <20250401035800.51504-1-chao@kernel.org> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 X-Headers-End: 1tzSlS-0007gr-UV Subject: [f2fs-dev] [PATCH v2] f2fs: support to disable linear lookup fallback X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Chao Yu via Linux-f2fs-devel From: Chao Yu Reply-To: Chao Yu Cc: Gabriel Krisman Bertazi , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net After commit 91b587ba79e1 ("f2fs: Introduce linear search for dentries"), f2fs forced to use linear lookup whenever a hash-based lookup fails on casefolded directory, it may affect performance for scenarios: a) create a new file w/ filename it doesn't exist in directory, b) lookup a file which may be removed. This patch supports to disable linear lookup fallback, so, once there is a solution for commit 5c26d2f1d3f5 ("unicode: Don't special case ignorable code points") to fix red heart unicode issue, then we can set an encodeing flag to disable the fallback for performance recovery. The way is kept in line w/ ext4, refer to commit 9e28059d5664 ("ext4: introduce linear search for dentries"). Cc: Daniel Lee Cc: Gabriel Krisman Bertazi Signed-off-by: Chao Yu --- v2: - check sb_no_casefold_compat_fallback in prior to other condition fs/f2fs/dir.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index 5a63ff0df03b..a9f21bc1915d 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -366,7 +366,8 @@ struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir, out: #if IS_ENABLED(CONFIG_UNICODE) - if (IS_CASEFOLDED(dir) && !de && use_hash) { + if (!sb_no_casefold_compat_fallback(dir->i_sb) && + IS_CASEFOLDED(dir) && !de && use_hash) { use_hash = false; goto start_find_entry; }