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GET /api/1.2/patches/2226003/?format=api
{ "id": 2226003, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2226003/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-5-yi.zhang@huaweicloud.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/1.2/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": "<20260422021042.4157510-5-yi.zhang@huaweicloud.com>", "list_archive_url": null, "date": "2026-04-22T02:10:24", "name": "[v3,04/22] ext4: add iomap address space operations for buffered I/O", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "e1f72be5af8190dbaa00743503f21c07baa8bd4a", "submitter": { "id": 85428, "url": "http://patchwork.ozlabs.org/api/1.2/people/85428/?format=api", "name": "Zhang Yi", "email": "yi.zhang@huaweicloud.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-5-yi.zhang@huaweicloud.com/mbox/", "series": [ { "id": 500911, "url": "http://patchwork.ozlabs.org/api/1.2/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/2226003/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226003/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=MsF3=CV=vger.kernel.org=linux-ext4+bounces-15965-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", 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"ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=172.234.253.10; helo=sea.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15965-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=45.249.212.51" ], "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 04/22] ext4: add iomap address space operations for\n buffered I/O", "Date": "Wed, 22 Apr 2026 10:10:24 +0800", "Message-ID": "<20260422021042.4157510-5-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--.2635S8", "X-Coremail-Antispam": "1UD129KBjvJXoWxXF1DuryDWryrtF4rGryfZwb_yoW5Kw45pF\n\t98Kas8Gr18XF9rua1Sqa9rZF4Yka4fJw4UKFW3W3Wa9Fy5G3y7KFW0k3WYkFy5K3y8Ar42\n\tqF4j9rW7WF17CrDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUmI14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0\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_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI\n\t42IY6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCw\n\tCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnI\n\tWIevJa73UjIFyTuYvjfUriihUUUUU", "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\nIntroduce initial support for iomap in the buffered I/O path for regular\nfiles on ext4.\n\n - Add a new inode state flag EXT4_STATE_BUFFERED_IOMAP to indicate the\n inode uses iomap instead of buffer_head for buffered I/O\n - Add helper ext4_inode_buffered_iomap() to check the flag\n - Add new address space operations ext4_iomap_aops with callbacks that\n will use generic iomap implementations\n - Add ext4_iomap_aops to ext4_set_aops() when the flag is set\n\nThe following callbacks(read_folio(), readahead(), writepages()) are\nprovided as placeholders and will be implemented in later patches.\n\nSigned-off-by: Zhang Yi <yi.zhang@huawei.com>\n---\n fs/ext4/ext4.h | 7 +++++++\n fs/ext4/inode.c | 32 ++++++++++++++++++++++++++++++++\n 2 files changed, 39 insertions(+)", "diff": "diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\nindex 9e4353432325..fe3491ad2129 100644\n--- a/fs/ext4/ext4.h\n+++ b/fs/ext4/ext4.h\n@@ -1972,6 +1972,7 @@ enum {\n \tEXT4_STATE_FC_COMMITTING,\t/* Fast commit ongoing */\n \tEXT4_STATE_FC_FLUSHING_DATA,\t/* Fast commit flushing data */\n \tEXT4_STATE_ORPHAN_FILE,\t\t/* Inode orphaned in orphan file */\n+\tEXT4_STATE_BUFFERED_IOMAP,\t/* Inode use iomap for buffered IO */\n };\n \n #define EXT4_INODE_BIT_FNS(name, field, offset)\t\t\t\t\\\n@@ -2040,6 +2041,12 @@ static inline bool ext4_inode_orphan_tracked(struct inode *inode)\n \t\t!list_empty(&EXT4_I(inode)->i_orphan);\n }\n \n+/* Whether the inode pass through the iomap infrastructure for buffered I/O */\n+static inline bool ext4_inode_buffered_iomap(struct inode *inode)\n+{\n+\treturn ext4_test_inode_state(inode, EXT4_STATE_BUFFERED_IOMAP);\n+}\n+\n /*\n * Codes for operating systems\n */\ndiff --git a/fs/ext4/inode.c b/fs/ext4/inode.c\nindex 59405a95ecfc..9e9f421888ed 100644\n--- a/fs/ext4/inode.c\n+++ b/fs/ext4/inode.c\n@@ -3908,6 +3908,22 @@ const struct iomap_ops ext4_iomap_report_ops = {\n \t.iomap_begin = ext4_iomap_begin_report,\n };\n \n+static int ext4_iomap_read_folio(struct file *file, struct folio *folio)\n+{\n+\treturn 0;\n+}\n+\n+static void ext4_iomap_readahead(struct readahead_control *rac)\n+{\n+\n+}\n+\n+static int ext4_iomap_writepages(struct address_space *mapping,\n+\t\t\t\t struct writeback_control *wbc)\n+{\n+\treturn 0;\n+}\n+\n /*\n * For data=journal mode, folio should be marked dirty only when it was\n * writeably mapped. When that happens, it was already attached to the\n@@ -3994,6 +4010,20 @@ static const struct address_space_operations ext4_da_aops = {\n \t.swap_activate\t\t= ext4_iomap_swap_activate,\n };\n \n+static const struct address_space_operations ext4_iomap_aops = {\n+\t.read_folio\t\t= ext4_iomap_read_folio,\n+\t.readahead\t\t= ext4_iomap_readahead,\n+\t.writepages\t\t= ext4_iomap_writepages,\n+\t.dirty_folio\t\t= iomap_dirty_folio,\n+\t.bmap\t\t\t= ext4_bmap,\n+\t.invalidate_folio\t= iomap_invalidate_folio,\n+\t.release_folio\t\t= iomap_release_folio,\n+\t.migrate_folio\t\t= filemap_migrate_folio,\n+\t.is_partially_uptodate = iomap_is_partially_uptodate,\n+\t.error_remove_folio\t= generic_error_remove_folio,\n+\t.swap_activate\t\t= ext4_iomap_swap_activate,\n+};\n+\n static const struct address_space_operations ext4_dax_aops = {\n \t.writepages\t\t= ext4_dax_writepages,\n \t.dirty_folio\t\t= noop_dirty_folio,\n@@ -4015,6 +4045,8 @@ void ext4_set_aops(struct inode *inode)\n \t}\n \tif (IS_DAX(inode))\n \t\tinode->i_mapping->a_ops = &ext4_dax_aops;\n+\telse if (ext4_inode_buffered_iomap(inode))\n+\t\tinode->i_mapping->a_ops = &ext4_iomap_aops;\n \telse if (test_opt(inode->i_sb, DELALLOC))\n \t\tinode->i_mapping->a_ops = &ext4_da_aops;\n \telse\n", "prefixes": [ "v3", "04/22" ] }