From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 94DCF37C0EA; Thu, 8 Jan 2026 07:50:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.2 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767858647; cv=none; b=MjMId6LX6znr80TdYRYAzNQyYD9mQjaIKf0XGrGxcz1vQ6vXE8h/eXtbGO1Vg5Z8ldtwsV18xRVhqVqToQ2XjbTKtO230WWWKFxdaUkDxOfJikLounFaDgnOXDVzfiFA/2P5NN/9hVz76J1CYmO7bpGT/cDkMKkSaXSSGzZTLdU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767858647; c=relaxed/simple; bh=rfHZT9404eaU8nG9PXA0f9ytaTjUnDYBY8SrxdySRpM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=aR3pw4IXyrfZlWlXb+Es21bspwplFIrE+ShhznCS5/03eCcXXyRHmSegZjc+8Jc2mc8+NTyb1lMxusIGegoC8/1CNYortvPPAh/rIf/+B8PiJKC/VAcYysakVNLhOSe5Gbiimxt+045p0G5RhDauYaH0KIeO1c23EfrKaHrSamQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=R4OzD8sv; arc=none smtp.client-ip=220.197.31.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="R4OzD8sv" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; bh=wd6pUirE51Jyz5Ivjwx97OdORTMjX3uKUwgkcmX3iBM=; b=R4OzD8sv1BPLSjU3Go6lNFBmQ7o5iAsvoJs0nZrBtKVylOSv2QL210ztY68MET JsieTaMNbPRXQseVbf6cPjzJjBdsvQjtLGNwoUoiMu5DcDhtum10SK9OBg0/yrVz ndsTxrA+SbbL+lPeJbG8M7pA42ROnbcP4EJ5xn169xJMY= Received: from czl-ubuntu-pc.. (unknown []) by gzga-smtp-mtada-g1-2 (Coremail) with SMTP id _____wBH6+WpYV9pdSx_Eg--.889S2; Thu, 08 Jan 2026 15:50:04 +0800 (CST) From: Chi Zhiling To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Namjae Jeon , Sungjong Seo , Yuezhang Mo , Chi Zhiling Subject: [PATCH v2 00/13] Enable multi-cluster fetching for exfat_get_block. Date: Thu, 8 Jan 2026 15:49:16 +0800 Message-ID: <20260108074929.356683-1-chizhiling@163.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wBH6+WpYV9pdSx_Eg--.889S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Aw15ZFWktFyUuw17tr48Crg_yoW8ur4fpr W3KwsxJrn5Xwn3JrsxAw1ktr4furn3JF17X347Gw17Cr1DZF4I9rZrtFn5CFyDG3yIqFs0 qr15Gw1j9r9xCrJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jnzVbUUUUU= X-CM-SenderInfo: hfkl6xxlol0wi6rwjhhfrp/xtbC2w21U2lfYa0AdgAA38 From: Chi Zhiling This patch series significantly improves exFAT read performance by adding multi-cluster mapping support. The changes reduce get_block calls during sequential reads, particularly benefiting small cluster sizes. - Extends exfat_get_cluster() and exfat_map_cluster() to handle multiple contiguous clusters - Adds buffer head caching for FAT table reads Performance results show ~10% improvement for 512-byte clusters (454->511 MB/s) and reduced get_block overhead from 10.8% to 0.02% for NO_FAT_CHAIN files. All criticism and suggestions are welcome :) Changes: - Cache the last dis-continuous cluster - Continue collect clusters after cache hit - Some cleanup. V1: https://lore.kernel.org/linux-fsdevel/20251226094440.455563-1-chizhiling@163.com/T/#u rfc: https://lore.kernel.org/linux-fsdevel/20251118082208.1034186-1-chizhiling@163.com/T/#u Chi Zhiling (13): exfat: add cache option for __exfat_ent_get exfat: support reuse buffer head for exfat_ent_get exfat: improve exfat_count_num_clusters exfat: improve exfat_find_last_cluster exfat: remove the check for infinite cluster chain loop exfat: remove the unreachable warning for cache miss cases exfat: reduce the number of parameters for exfat_get_cluster() exfat: reuse cache to improve exfat_get_cluster exfat: remove handling of non-file types in exfat_map_cluster exfat: support multi-cluster for exfat_map_cluster exfat: tweak cluster cache to support zero offset exfat: return the start of next cache in exfat_cache_lookup exfat: support multi-cluster for exfat_get_cluster fs/exfat/cache.c | 149 ++++++++++++++++++++++++++++---------------- fs/exfat/exfat_fs.h | 7 +-- fs/exfat/fatent.c | 61 +++++++++++------- fs/exfat/inode.c | 52 ++++++---------- 4 files changed, 157 insertions(+), 112 deletions(-) base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 prerequisite-patch-id: e5f54b5b252924be0d139310a81d57eda55bead3 -- 2.43.0