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GET /api/1.2/patches/2226002/?format=api
{ "id": 2226002, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2226002/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-12-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": "<20260422021042.4157510-12-yi.zhang@huaweicloud.com>", "list_archive_url": null, "date": "2026-04-22T02:10:31", "name": "[v3,11/22] iomap: correct the range of a partial dirty clear", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "0e84901a8f5e97cca467f57a34eda428e1b177ff", "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/20260422021042.4157510-12-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/2226002/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226002/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=iene=CV=vger.kernel.org=linux-ext4+bounces-15968-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=150.107.74.76; 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a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1776824220; c=relaxed/simple;\n\tbh=x1EARZ+iPskL6tZ0XIQegu+D7qkGMNZuUfvY3uTByYs=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=VlshnyqVOabJMOiOH5aI8baGHvmdDxC8BtkZWvqOb+3HZ8yS1aUA4lx3GuwGMvtbtcJC0ui5d9L9zY7pJvvTxBT5VDQDeSFYVb9XPO8isR3YFEeAxUw1OsPspma5goIX2kYWXrWrOgLvD9kHEorhC0uL/Yv6UrQl6RYaflJwU5I=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=2600:3c15:e001:75::12fc:5321; helo=sin.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15968-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=none 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 11/22] iomap: correct the range of a partial dirty clear", "Date": "Wed, 22 Apr 2026 10:10:31 +0800", "Message-ID": "<20260422021042.4157510-12-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--.2635S15", "X-Coremail-Antispam": "1UD129KBjvJXoW7ury5ArW5Wr4DKF1xuryDJrb_yoW8CFW8pF\n\ts3KFs8KrWDW34kuay8ZFWrXFnYka9rXF4xArW3W3s3Wa15AFyFgFn293y5uF92gr4xAF10\n\tvF13KrWxCrWDAaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\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 block range calculation in ifs_clear_range_dirty() is incorrect when\npartially clearing a range in a folio. We cannot clear the dirty bit of\nthe first block or the last block if the start or end offset is not\nblocksize-aligned. This has not yet caused any issues since we always\nclear a whole folio in iomap_writeback_folio().\n\nFix this by rounding up the first block to blocksize alignment, and\ncalculate the last block by rounding down (using truncation). Correct\nthe nr_blks calculation accordingly.\n\nSigned-off-by: Zhang Yi <yi.zhang@huawei.com>\n---\nThis is modified from:\n https://lore.kernel.org/linux-fsdevel/20240812121159.3775074-2-yi.zhang@huaweicloud.com/\nChanges:\n - Use round_up() instead of DIV_ROUND_UP() to prevent wasted integer\n division.\n\n fs/iomap/buffered-io.c | 10 +++++++---\n 1 file changed, 7 insertions(+), 3 deletions(-)", "diff": "diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c\nindex d7b648421a70..7e7d5b776d35 100644\n--- a/fs/iomap/buffered-io.c\n+++ b/fs/iomap/buffered-io.c\n@@ -176,11 +176,15 @@ static void ifs_clear_range_dirty(struct folio *folio,\n {\n \tstruct inode *inode = folio->mapping->host;\n \tunsigned int blks_per_folio = i_blocks_per_folio(inode, folio);\n-\tunsigned int first_blk = (off >> inode->i_blkbits);\n-\tunsigned int last_blk = (off + len - 1) >> inode->i_blkbits;\n-\tunsigned int nr_blks = last_blk - first_blk + 1;\n+\tunsigned int first_blk = round_up(off, i_blocksize(inode)) >>\n+\t\t\t\t inode->i_blkbits;\n+\tunsigned int last_blk = (off + len) >> inode->i_blkbits;\n+\tunsigned int nr_blks = last_blk - first_blk;\n \tunsigned long flags;\n \n+\tif (!nr_blks)\n+\t\treturn;\n+\n \tspin_lock_irqsave(&ifs->state_lock, flags);\n \tbitmap_clear(ifs->state, first_blk + blks_per_folio, nr_blks);\n \tspin_unlock_irqrestore(&ifs->state_lock, flags);\n", "prefixes": [ "v3", "11/22" ] }