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GET /api/1.2/patches/2226013/?format=api
{ "id": 2226013, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2226013/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-14-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": "<20260422021042.4157510-14-yi.zhang@huaweicloud.com>", "list_archive_url": null, "date": "2026-04-22T02:10:33", "name": "[v3,13/22] iomap: fix incorrect did_zero setting in iomap_zero_iter()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c42c636f26012732e9cc1b096baefed4f56fe2fa", "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/20260422021042.4157510-14-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/2226013/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226013/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=rXUj=CV=vger.kernel.org=linux-ext4+bounces-15981-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=1776824227; c=relaxed/simple;\n\tbh=MgOzNx3i4g+Amum0Bg8TWTc4SNzjpmUBOxr9SspLvkM=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=JpA1F4KeXFTHMFSq078bZZSDIfa1AZOpro+f1MuyjECdZ+au+TBTuNpEvBYRnqxlPAWmiTi75VPf/EsozgnFQUThIUhhvgh71hxvyo0apLZoSqyCq7KWptfSLqFLMU1riFIs1Xltg00+KQzzkv0gfIZvi1uN4yBgjJbqb7zVRpc=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15981-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 13/22] iomap: fix incorrect did_zero setting in\n iomap_zero_iter()", "Date": "Wed, 22 Apr 2026 10:10:33 +0800", "Message-ID": "<20260422021042.4157510-14-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--.2635S17", "X-Coremail-Antispam": "1UD129KBjvJXoWxJr1UJr4fuw1kXF18uw4kZwb_yoW8tr48p3\n\t9xKayDCFn2qrW7uFn5JF9Ivr1Yyws5JrW7Wr4UGwn8ZF4qvr4YkF1FgayYvF1xJ34fA3Wa\n\tyF4jyas2qF4UCrDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\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\nThe did_zero output parameter was unconditionally set after the loop,\nwhich is incorrect. It should only be set when the zeroing operation\nactually completes, not when IOMAP_F_STALE is set or when\nIOMAP_F_FOLIO_BATCH is set but !folio causes the loop to break early,\nor when iomap_iter_advance() returns an error.\n\nThis causes did_zero to be incorrectly set when zeroing a clean\nunwritten extent because the loop exits early without actually zeroing\nany data.\n\nFix it by using a local variable to track whether any folio was actually\nzeroed, and only set did_zero after the loop if zeroing happened.\n\nSigned-off-by: Zhang Yi <yi.zhang@huawei.com>\nReviewed-by: \"Darrick J. Wong\" <djwong@kernel.org>\n---\nThis is cherry picked form:\n https://lore.kernel.org/linux-fsdevel/20260310082250.3535486-1-yi.zhang@huaweicloud.com/\nNo changes.\n\n fs/iomap/buffered-io.c | 8 ++++++--\n 1 file changed, 6 insertions(+), 2 deletions(-)", "diff": "diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c\nindex b17296b61a6e..0ffc2c3230af 100644\n--- a/fs/iomap/buffered-io.c\n+++ b/fs/iomap/buffered-io.c\n@@ -1542,6 +1542,7 @@ static int iomap_zero_iter(struct iomap_iter *iter, bool *did_zero,\n \t\tconst struct iomap_write_ops *write_ops)\n {\n \tu64 bytes = iomap_length(iter);\n+\tbool zeroed = false;\n \tint status;\n \n \tdo {\n@@ -1560,6 +1561,8 @@ static int iomap_zero_iter(struct iomap_iter *iter, bool *did_zero,\n \t\t/* a NULL folio means we're done with a folio batch */\n \t\tif (!folio) {\n \t\t\tstatus = iomap_iter_advance_full(iter);\n+\t\t\tif (status)\n+\t\t\t\treturn status;\n \t\t\tbreak;\n \t\t}\n \n@@ -1570,6 +1573,7 @@ static int iomap_zero_iter(struct iomap_iter *iter, bool *did_zero,\n \t\t\t\tbytes);\n \n \t\tfolio_zero_range(folio, offset, bytes);\n+\t\tzeroed = true;\n \t\tfolio_mark_accessed(folio);\n \n \t\tret = iomap_write_end(iter, bytes, bytes, folio);\n@@ -1579,10 +1583,10 @@ static int iomap_zero_iter(struct iomap_iter *iter, bool *did_zero,\n \n \t\tstatus = iomap_iter_advance(iter, bytes);\n \t\tif (status)\n-\t\t\tbreak;\n+\t\t\treturn status;\n \t} while ((bytes = iomap_length(iter)) > 0);\n \n-\tif (did_zero)\n+\tif (did_zero && zeroed)\n \t\t*did_zero = true;\n \treturn status;\n }\n", "prefixes": [ "v3", "13/22" ] }