From nobody Tue Feb 10 00:02:51 2026 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) (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 40D9E2D641C; Tue, 18 Nov 2025 08:26:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763454413; cv=none; b=RItDNZ7gmFWJNHqRtDi8g3U/x/LE0sfZtafPOQmwcbJ5oo1vPjq1NG1O4A40zS0X8J+5ZXv5hYDeMi1txeMUxQxb8hUlnceqwkvgBH82gFBeXBcqsh56ALl+6e31M0Z3rtNAz2kHa0oBGh04B3sOic62oVAbb5ahZr8uHgb5M/M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763454413; c=relaxed/simple; bh=83CUkqg3DKZvhqPz7BeX2UXkFHH04US6sL7GjVRTLQc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pWkauelo4AG+ZPQs8BMa9J7J2sHlEmrn6ePAQPBb0DdBjkWWUhk870jZQDewF/s6FU2yeyV3ss0ZPhkk2GqUvSSDepZC7cMT7Uj+Z0fnQxH3U5BNxKph73Wxu0rEHfxFOu28++AvG+4UKWBAneHt0uUDWt5qXj+kpqVRy94UxgA= 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=K7Op5jgB; arc=none smtp.client-ip=220.197.31.4 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="K7Op5jgB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=U0 7yPNefwy1OYQZSIN4NA7Tac2w5lWyx5VcfQ4rt6EI=; b=K7Op5jgBAj3tIU6Pnq qp89i4N/LWOMAsgybDgYxbcaowgtQovP4RUAhTGZ4lhwED2miA3SibaNawigFVEu M3McD/jIzBdOuHnDrgRed/6u8lwG2pQTNlYYzXziZhNr0+4B/WmwS909knaG/7k9 wdQO1Td05YF3L1twxz/qPTIGU= Received: from czl-ubuntu-pc.. (unknown []) by gzsmtp3 (Coremail) with SMTP id PigvCgAnu_KILRxpyC6zEQ--.29019S5; Tue, 18 Nov 2025 16:25:45 +0800 (CST) From: Chi Zhiling To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Alexander Viro , Christian Brauner , Jan Kara , Matthew Wilcox , Namjae Jeon , Sungjong Seo , Yuezhang Mo , Chi Zhiling Subject: [RFC PATCH 3/7] exfat: reuse cache to improve exfat_get_cluster Date: Tue, 18 Nov 2025 16:22:04 +0800 Message-ID: <20251118082208.1034186-4-chizhiling@163.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251118082208.1034186-1-chizhiling@163.com> References: <20251118082208.1034186-1-chizhiling@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: PigvCgAnu_KILRxpyC6zEQ--.29019S5 X-Coremail-Antispam: 1Uf129KBjvJXoW7Ar15Gr4ftr4fXF43GF43GFg_yoW8Wr4kpr Z8KayUtrW5A397uw48KFn3Z3WS9FZ7Ja1UGa13A3Wjkryqyr4F9r17Kr9xA3WrJw48uF4Y 9r15K3WUurnrG3JanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jqOJnUUUUU= X-CM-SenderInfo: hfkl6xxlol0wi6rwjhhfrp/xtbBcxEKnWkcJZTfwgAAss Content-Type: text/plain; charset="utf-8" From: Chi Zhiling Since exfat_ent_get supports cache buffer head, we can use this option to reduce sb_bread calls when fetching consecutive entries. Signed-off-by: Chi Zhiling --- fs/exfat/cache.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/exfat/cache.c b/fs/exfat/cache.c index 61af3fa05ab7..a5e6858e5a20 100644 --- a/fs/exfat/cache.c +++ b/fs/exfat/cache.c @@ -241,6 +241,7 @@ int exfat_get_cluster(struct inode *inode, unsigned int= cluster, struct exfat_sb_info *sbi =3D EXFAT_SB(sb); unsigned int limit =3D sbi->num_clusters; struct exfat_inode_info *ei =3D EXFAT_I(inode); + struct buffer_head *bh =3D NULL; struct exfat_cache_id cid; unsigned int content; =20 @@ -284,10 +285,10 @@ int exfat_get_cluster(struct inode *inode, unsigned i= nt cluster, exfat_fs_error(sb, "detected the cluster chain loop (i_pos %u)", (*fclus)); - return -EIO; + goto err; } =20 - if (exfat_ent_get(sb, *dclus, &content, NULL)) + if (exfat_ent_get(sb, *dclus, &content, &bh)) return -EIO; =20 *last_dclus =3D *dclus; @@ -299,7 +300,7 @@ int exfat_get_cluster(struct inode *inode, unsigned int= cluster, exfat_fs_error(sb, "invalid cluster chain (i_pos %u, last_clus 0x%08x is EOF)", *fclus, (*last_dclus)); - return -EIO; + goto err; } =20 break; @@ -309,6 +310,10 @@ int exfat_get_cluster(struct inode *inode, unsigned in= t cluster, cache_init(&cid, *fclus, *dclus); } =20 + brelse(bh); exfat_cache_add(inode, &cid); return 0; +err: + brelse(bh); + return -EIO; } --=20 2.43.0