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GET /api/patches/2226017/?format=api
{ "id": 2226017, "url": "http://patchwork.ozlabs.org/api/patches/2226017/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-19-yi.zhang@huaweicloud.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/projects/8/?format=api", "name": "Linux ext4 filesystem development", "link_name": "linux-ext4", "list_id": "linux-ext4.vger.kernel.org", "list_email": "linux-ext4@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260422021042.4157510-19-yi.zhang@huaweicloud.com>", "list_archive_url": null, "date": "2026-04-22T02:10:38", "name": "[v3,18/22] ext4: introduce a mount option for iomap buffered I/O path", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c93a22a97461df90a515b3e584768df0667391e8", "submitter": { "id": 85428, "url": "http://patchwork.ozlabs.org/api/people/85428/?format=api", "name": "Zhang Yi", "email": "yi.zhang@huaweicloud.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-19-yi.zhang@huaweicloud.com/mbox/", "series": [ { "id": 500911, "url": "http://patchwork.ozlabs.org/api/series/500911/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=500911", "date": "2026-04-22T02:10:23", "name": "ext4: use iomap for regular file's buffered I/O path", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/500911/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226017/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226017/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=pS5e=CV=vger.kernel.org=linux-ext4+bounces-15983-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-ext4@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1776824228; c=relaxed/simple;\n\tbh=8p0Z9TxyTBGaGe+jUygLLGUtsOnSGgzFOKdWwjlKTR0=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=BCQ0VibC+r3TqYoTBdzaWG1jD07kDUkXjvjN3ABsskzXrcMZc99/4VWkGpwgXK3gTPGOUbigE/O2EcQWDzbij9E6b6JgKrWNqLOBvEf/IQAhGUXzdLCMUeTclyHYBhiHO8GwjKj4imxw4QFFO3VMkeraIQcCbQvskLIFdX5NCks=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15983-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org", "i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56" ], "From": "Zhang Yi <yi.zhang@huaweicloud.com>", "To": "linux-ext4@vger.kernel.org,\n\tlinux-fsdevel@vger.kernel.org", "Cc": "linux-kernel@vger.kernel.org,\n\ttytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tlibaokun@linux.alibaba.com,\n\tjack@suse.cz,\n\tojaswin@linux.ibm.com,\n\tritesh.list@gmail.com,\n\tdjwong@kernel.org,\n\thch@infradead.org,\n\tyi.zhang@huawei.com,\n\tyi.zhang@huaweicloud.com,\n\tyizhang089@gmail.com,\n\tyangerkun@huawei.com,\n\tyukuai@fnnas.com", "Subject": "[PATCH v3 18/22] ext4: introduce a mount option for iomap buffered\n I/O path", "Date": "Wed, 22 Apr 2026 10:10:38 +0800", "Message-ID": "<20260422021042.4157510-19-yi.zhang@huaweicloud.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260422021042.4157510-1-yi.zhang@huaweicloud.com>", "References": "<20260422021042.4157510-1-yi.zhang@huaweicloud.com>", "Precedence": "bulk", "X-Mailing-List": "linux-ext4@vger.kernel.org", "List-Id": "<linux-ext4.vger.kernel.org>", "List-Subscribe": "<mailto:linux-ext4+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-ext4+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-CM-TRANSID": "_Ch0CgB3JL6PL+hpqkgUBQ--.2635S22", "X-Coremail-Antispam": "1UD129KBjvJXoWxXr48Cw45uw1ftF4UKFWfXwb_yoW5Cr1xpr\n\t90kFy8Gr1kXryF93yxuF48Gr1Fy3Z09a1UCrWFgrsrWFZrAryxXFyfKFn5CFWagrW8X34I\n\tqF18Ww17WF43CrDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUmS14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0\n\trVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI\n\tkIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2\n\tz4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F\n\t4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq\n\t3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7\n\tIYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U\n\tM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2\n\tkIc2xKxwCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkE\n\tbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67\n\tAF67kF1VAFwI0_GFv_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVW8JVW5JwCI\n\t42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF\n\t4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBI\n\tdaVFxhVjvjDU0xZFpf9x0JUWMKtUUUUU=", "X-CM-SenderInfo": "d1lo6xhdqjqx5xdzvxpfor3voofrz/", "X-Spam-Status": "No, score=-1.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDMARC_MISSING,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "From: Zhang Yi <yi.zhang@huawei.com>\n\nSince the iomap buffered I/O path does not yet support all existing\nfeatures, it cannot be enabled by default. Introduce 'buffered_iomap'\nand 'nobuffered_iomap' mount options to enable and disable the iomap\nbuffered I/O path for regular files.\n\nSigned-off-by: Zhang Yi <yi.zhang@huawei.com>\n---\n fs/ext4/ext4.h | 1 +\n fs/ext4/inode.c | 2 ++\n fs/ext4/super.c | 7 +++++++\n 3 files changed, 10 insertions(+)", "diff": "diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\nindex 80d086d40990..60ba488b01c5 100644\n--- a/fs/ext4/ext4.h\n+++ b/fs/ext4/ext4.h\n@@ -1281,6 +1281,7 @@ struct ext4_inode_info {\n \t\t\t\t\t\t * scanning in mballoc\n \t\t\t\t\t\t */\n #define EXT4_MOUNT2_ABORT\t\t0x00000100 /* Abort filesystem */\n+#define EXT4_MOUNT2_BUFFERED_IOMAP\t0x00000200 /* Use iomap for buffered I/O */\n \n #define clear_opt(sb, opt)\t\tEXT4_SB(sb)->s_mount_opt &= \\\n \t\t\t\t\t\t~EXT4_MOUNT_##opt\ndiff --git a/fs/ext4/inode.c b/fs/ext4/inode.c\nindex 57b5708235cf..d2f7af7922d7 100644\n--- a/fs/ext4/inode.c\n+++ b/fs/ext4/inode.c\n@@ -5750,6 +5750,8 @@ void ext4_enable_buffered_iomap(struct inode *inode)\n {\n \tstruct super_block *sb = inode->i_sb;\n \n+\tif (!test_opt2(sb, BUFFERED_IOMAP))\n+\t\treturn;\n \tif (!S_ISREG(inode->i_mode))\n \t\treturn;\n \tif (ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE))\ndiff --git a/fs/ext4/super.c b/fs/ext4/super.c\nindex 62bfe05a64bc..b2da4834b6bb 100644\n--- a/fs/ext4/super.c\n+++ b/fs/ext4/super.c\n@@ -1722,6 +1722,7 @@ enum {\n \tOpt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,\n \tOpt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,\n \tOpt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,\n+\tOpt_buffered_iomap, Opt_nobuffered_iomap,\n \tOpt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,\n #ifdef CONFIG_EXT4_DEBUG\n \tOpt_fc_debug_max_replay, Opt_fc_debug_force\n@@ -1860,6 +1861,8 @@ static const struct fs_parameter_spec ext4_param_specs[] = {\n \tfsparam_flag\t(\"no_prefetch_block_bitmaps\",\n \t\t\t\t\t\tOpt_no_prefetch_block_bitmaps),\n \tfsparam_s32\t(\"mb_optimize_scan\",\tOpt_mb_optimize_scan),\n+\tfsparam_flag\t(\"buffered_iomap\",\tOpt_buffered_iomap),\n+\tfsparam_flag\t(\"nobuffered_iomap\",\tOpt_nobuffered_iomap),\n \tfsparam_string\t(\"check\",\t\tOpt_removed),\t/* mount option from ext2/3 */\n \tfsparam_flag\t(\"nocheck\",\t\tOpt_removed),\t/* mount option from ext2/3 */\n \tfsparam_flag\t(\"reservation\",\t\tOpt_removed),\t/* mount option from ext2/3 */\n@@ -1953,6 +1956,10 @@ static const struct mount_opts {\n \t{Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},\n \t{Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,\n \t MOPT_SET},\n+\t{Opt_buffered_iomap, EXT4_MOUNT2_BUFFERED_IOMAP,\n+\t MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},\n+\t{Opt_nobuffered_iomap, EXT4_MOUNT2_BUFFERED_IOMAP,\n+\t MOPT_CLEAR | MOPT_2 | MOPT_EXT4_ONLY},\n #ifdef CONFIG_EXT4_DEBUG\n \t{Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,\n \t MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},\n", "prefixes": [ "v3", "18/22" ] }