From nobody Tue Nov 26 05:58:34 2024 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (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 F09351474BF; Tue, 22 Oct 2024 03:13:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729566783; cv=none; b=epPpTKZe+sNEsb6iJtOXxNHKKlQR+Y16fEp/bvTQCkZB9oW6BebaNbypqr/gqVZWKpV76jkWiI0OOH34IyleTYXFWSv35HtbORtbszUZkES+xHFFToHGnP4hRKLrBjmPXpE2pZsRQFEaCE2qNgO+5+iCRIzy3jXHgbZB8ZbIt+w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729566783; c=relaxed/simple; bh=mfpbSaLpTZWPmr7Qv9kGMuWgxyR1PGeQlGnSV9/uK1M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TYhS0NATSfBhQ4zAs9wpB6ZbA7mya340rL5HIai0logD0bomUbUWtLc7vDPn/+uKGEbGdQYvXaq4kdzScU4wQcrU2/u1q5HpbXBsaDMtREZ+CFY51SBLY5Me8wq70gnn/YvXIVpePjfmOFRPyk+jnE3EBNFoVFEpqd2jikB+XGI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=none smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4XXcgK66cyz4f3jkk; Tue, 22 Oct 2024 11:12:45 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 227051A018D; Tue, 22 Oct 2024 11:12:58 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.112.188]) by APP4 (Coremail) with SMTP id gCh0CgCXysYlGBdnPSwWEw--.716S18; Tue, 22 Oct 2024 11:12:57 +0800 (CST) From: Zhang Yi To: linux-ext4@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca, jack@suse.cz, ritesh.list@gmail.com, hch@infradead.org, djwong@kernel.org, david@fromorbit.com, zokeefe@google.com, yi.zhang@huawei.com, yi.zhang@huaweicloud.com, chengzhihao1@huawei.com, yukuai3@huawei.com, yangerkun@huawei.com Subject: [PATCH 14/27] ext4: implement buffered read iomap path Date: Tue, 22 Oct 2024 19:10:45 +0800 Message-ID: <20241022111059.2566137-15-yi.zhang@huaweicloud.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20241022111059.2566137-1-yi.zhang@huaweicloud.com> References: <20241022111059.2566137-1-yi.zhang@huaweicloud.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: gCh0CgCXysYlGBdnPSwWEw--.716S18 X-Coremail-Antispam: 1UD129KBjvJXoW7CFyDXF1UXrW3Zw4UurWkXrb_yoW8KrWrpF 98KFy5GF47XrnI9a1SgFZrJr1Fk3WxtF45ZrWfWasxuFyYkrW2gay0gFyYvF1Yq3yxAr10 qr4jkr1xWF1UArDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUQl14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2jI8I6cxK62vIxIIY0VWUZVW8XwA2048vs2IY02 0E87I2jVAFwI0_JF0E3s1l82xGYIkIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0 rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6x IIjxv20xvEc7CjxVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK 6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4 xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVWUJVW8 JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20V AGYxC7M4IIrI8v6xkF7I0E8cxan2IY04v7MxkF7I0En4kS14v26r1q6r43MxAIw28IcxkI 7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxV Cjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y0x0EwIxGrwCI42IY 6xIIjxv20xvE14v26r4j6ryUMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UMIIF0x vE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv 6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7sRRgAFtUUUUU== X-CM-SenderInfo: d1lo6xhdqjqx5xdzvxpfor3voofrz/ Content-Type: text/plain; charset="utf-8" From: Zhang Yi Introduce a new iomap_ops, ext4_iomap_buffered_read_ops to implement the iomap read paths, specifically .read_folio() and .readahead() of ext4_iomap_aops. This .iomap_begin() handle invokes ext4_map_blocks() to query the extent mapping status of the read range and then converts the mapping information to iomap. Signed-off-by: Zhang Yi --- fs/ext4/inode.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index b233f36efefa..f0bc4b58ac4f 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3526,14 +3526,47 @@ const struct iomap_ops ext4_iomap_report_ops =3D { .iomap_begin =3D ext4_iomap_begin_report, }; =20 -static int ext4_iomap_read_folio(struct file *file, struct folio *folio) +static int ext4_iomap_buffered_read_begin(struct inode *inode, loff_t offs= et, + loff_t length, unsigned int flags, struct iomap *iomap, + struct iomap *srcmap) { + int ret; + struct ext4_map_blocks map; + u8 blkbits =3D inode->i_blkbits; + + if (unlikely(ext4_forced_shutdown(inode->i_sb))) + return -EIO; + if ((offset >> blkbits) > EXT4_MAX_LOGICAL_BLOCK) + return -EINVAL; + /* Inline data support is not yet available. */ + if (WARN_ON_ONCE(ext4_has_inline_data(inode))) + return -ERANGE; + + /* Calculate the first and last logical blocks respectively. */ + map.m_lblk =3D offset >> blkbits; + map.m_len =3D min_t(loff_t, (offset + length - 1) >> blkbits, + EXT4_MAX_LOGICAL_BLOCK) - map.m_lblk + 1; + + ret =3D ext4_map_blocks(NULL, inode, &map, 0); + if (ret < 0) + return ret; + + ext4_set_iomap(inode, iomap, &map, offset, length, flags); return 0; } =20 -static void ext4_iomap_readahead(struct readahead_control *rac) +const struct iomap_ops ext4_iomap_buffered_read_ops =3D { + .iomap_begin =3D ext4_iomap_buffered_read_begin, +}; + +static int ext4_iomap_read_folio(struct file *file, struct folio *folio) { + return iomap_read_folio(folio, &ext4_iomap_buffered_read_ops); +} =20 +static void ext4_iomap_readahead(struct readahead_control *rac) +{ + iomap_readahead(rac, &ext4_iomap_buffered_read_ops); } =20 static int ext4_iomap_writepages(struct address_space *mapping, --=20 2.46.1