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GET /api/1.2/patches/2226012/?format=api
{ "id": 2226012, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2226012/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-6-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": "<20260422021042.4157510-6-yi.zhang@huaweicloud.com>", "list_archive_url": null, "date": "2026-04-22T02:10:25", "name": "[v3,05/22] ext4: implement buffered read path using iomap", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "5461a87e95437655f5451a08b0e12906ca9bcff0", "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/20260422021042.4157510-6-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/2226012/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226012/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=xZy/=CV=vger.kernel.org=linux-ext4+bounces-15972-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=1776824222; c=relaxed/simple;\n\tbh=AxOhwkfgQS+PDWAJdieVpQIzyuhddjFIhmvSBwoE34k=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=Fxl5HUM890duuOJG+w7RM1KjkfzyBIRBk0Wa+kEASeVgUmfRGOYHlLzyAX1/wj1PxfTKGyek+v9efeFOSt+zghUsHNWMgKJpESnrL8vrhIrNJRrmnj/stHrN0ZzzLdQHMifcJuN5F0WsEVQD+HNl6+VutZBXSMkLFposcWRHLLU=" ], "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-15972-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 05/22] ext4: implement buffered read path using iomap", "Date": "Wed, 22 Apr 2026 10:10:25 +0800", "Message-ID": "<20260422021042.4157510-6-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--.2635S9", "X-Coremail-Antispam": "1UD129KBjvJXoWxGrW3tr4DXry8JFWktr1DJrb_yoW5Xr47pF\n\t90kFy5Gr4UWrnF9F4SqFZrXr1Ykan7Ja1UWryfGwnxWF90krW2gayjgF1YvF15tw47Ar40\n\tqF4jkry8Wr1UArDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUma14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0\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_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI\n\t42IY6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCw\n\tCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4UJVWxJrUvcSsG\n\tvfC2KfnxnUUI43ZEXa7VU1zpBDUUUUU==", "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\nImplement the iomap read path for ext4 by introducing a new\next4_iomap_buffered_read_ops instance. This provides the read_folio()\nand readahead() callbacks for ext4_iomap_aops. The implementation\nintroduces:\n\n - ext4_iomap_map_blocks(): Helper function to query extent mappings for\n a given read range using ext4_map_blocks() and convert the mapping\n information to iomap type\n - ext4_iomap_buffered_read_begin(): The iomap_begin callback that maps\n blocks, validates filesystem state, and populates the iomap. It\n returns -ERANGE for inline data which is not yet supported.\n\nSigned-off-by: Zhang Yi <yi.zhang@huawei.com>\n---\n fs/ext4/inode.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-\n 1 file changed, 44 insertions(+), 1 deletion(-)", "diff": "diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c\nindex 9e9f421888ed..df21f6870ec4 100644\n--- a/fs/ext4/inode.c\n+++ b/fs/ext4/inode.c\n@@ -3908,14 +3908,57 @@ const struct iomap_ops ext4_iomap_report_ops = {\n \t.iomap_begin = ext4_iomap_begin_report,\n };\n \n+static int ext4_iomap_map_blocks(struct inode *inode, loff_t offset,\n+\t\tloff_t length, struct ext4_map_blocks *map)\n+{\n+\tu8 blkbits = inode->i_blkbits;\n+\n+\tif ((offset >> blkbits) > EXT4_MAX_LOGICAL_BLOCK)\n+\t\treturn -EINVAL;\n+\n+\t/* Calculate the first and last logical blocks respectively. */\n+\tmap->m_lblk = offset >> blkbits;\n+\tmap->m_len = min_t(loff_t, (offset + length - 1) >> blkbits,\n+\t\t\t EXT4_MAX_LOGICAL_BLOCK) - map->m_lblk + 1;\n+\n+\treturn ext4_map_blocks(NULL, inode, map, 0);\n+}\n+\n+static int ext4_iomap_buffered_read_begin(struct inode *inode, loff_t offset,\n+\t\tloff_t length, unsigned int flags, struct iomap *iomap,\n+\t\tstruct iomap *srcmap)\n+{\n+\tstruct ext4_map_blocks map;\n+\tint ret;\n+\n+\tif (unlikely(ext4_forced_shutdown(inode->i_sb)))\n+\t\treturn -EIO;\n+\n+\t/* Inline data support is not yet available. */\n+\tif (WARN_ON_ONCE(ext4_has_inline_data(inode)))\n+\t\treturn -ERANGE;\n+\n+\tret = ext4_iomap_map_blocks(inode, offset, length, &map);\n+\tif (ret < 0)\n+\t\treturn ret;\n+\n+\text4_set_iomap(inode, iomap, &map, offset, length, flags);\n+\treturn 0;\n+}\n+\n+const struct iomap_ops ext4_iomap_buffered_read_ops = {\n+\t.iomap_begin = ext4_iomap_buffered_read_begin,\n+};\n+\n static int ext4_iomap_read_folio(struct file *file, struct folio *folio)\n {\n+\tiomap_bio_read_folio(folio, &ext4_iomap_buffered_read_ops);\n \treturn 0;\n }\n \n static void ext4_iomap_readahead(struct readahead_control *rac)\n {\n-\n+\tiomap_bio_readahead(rac, &ext4_iomap_buffered_read_ops);\n }\n \n static int ext4_iomap_writepages(struct address_space *mapping,\n", "prefixes": [ "v3", "05/22" ] }