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{ "id": 2216386, "url": "http://patchwork.ozlabs.org/api/covers/2216386/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260326111054.907252-1-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": "<20260326111054.907252-1-yi.zhang@huaweicloud.com>", "list_archive_url": null, "date": "2026-03-26T11:10:43", "name": "[v3,00/11] ext4: refactor partial block zero-out for iomap conversion", "submitter": { "id": 85428, "url": "http://patchwork.ozlabs.org/api/people/85428/?format=api", "name": "Zhang Yi", "email": "yi.zhang@huaweicloud.com" }, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260326111054.907252-1-yi.zhang@huaweicloud.com/mbox/", "series": [ { "id": 497571, "url": "http://patchwork.ozlabs.org/api/series/497571/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=497571", "date": "2026-03-26T11:10:46", "name": "ext4: refactor partial block zero-out for iomap conversion", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/497571/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2216386/comments/", "headers": { "Return-Path": "\n <SRS0=btxx=B2=vger.kernel.org=linux-ext4+bounces-15442-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=1774523755; c=relaxed/simple;\n\tbh=Hxc8UH8WPI8wcqXMrD03NNoiKWXOjOhhiVA6fSKslf4=;\n\th=From:To:Cc:Subject:Date:Message-ID:MIME-Version;\n b=Kjve3Cddy1vZqzPnzUUVsk5/f7oCExuw7SqUA+8/+72LSOvorinCCVRWWRB8XW35QPoBCW8QV0MeEUY2SpooNJiVM2yBrxWHyRJvZG+TVAag/4hh6HGQpPkV8q4wUgfQfd1B9zSi7D2PoQnjUGp5HX4PwTyr45i8aKLAYPPf2HY=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=172.232.135.74; helo=sto.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15442-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", "Cc": "linux-fsdevel@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\ttytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tjack@suse.cz,\n\tojaswin@linux.ibm.com,\n\tritesh.list@gmail.com,\n\tlibaokun@linux.alibaba.com,\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 00/11] ext4: refactor partial block zero-out for iomap\n conversion", "Date": "Thu, 26 Mar 2026 19:10:43 +0800", "Message-ID": "<20260326111054.907252-1-yi.zhang@huaweicloud.com>", "X-Mailer": "git-send-email 2.52.0", "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": "cCh0CgD3+NhWFcVprDInCQ--.2580S4", "X-Coremail-Antispam": "1UD129KBjvJXoWxXw4kZrWxKFyxXr1kXw4fKrg_yoWrAF1fpF\n\tWakw1S9r4xG39F9a97Ca1xX3WS9wn3WF4rGrW3G34UZ3yUZF1xCF4kK3WF9FWUKrWfG3Wj\n\tqF4jya4UGF1DAa7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUU9Y14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0\n\trVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02\n\t1l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U\n\tJVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc\n\tCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E\n\t2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV\n\tW8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2\n\tY2ka0xkIwI1lc7CjxVAaw2AFwI0_Jw0_GFyl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x\n\t0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2\n\tzVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF\n\t4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWU\n\tCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCT\n\tnIWIevJa73UjIFyTuYvjfUonmRUUUUU", "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\nChanges since v2:\n - Drop patch 02 in v2 because it will not be used in the later iomap\n conversion.\n - In patch 08, modify ext4_alloc_file_blocks() to zero out EOF block\n when new_size is larger than old_size, preventing the exposure of\n stale data when the user performs fallocate starting within the\n old_size. This was pointed out by Sashiko.\n - In patch 08, add checks for the return value of\n ext4_block_zero_eof().\n - Add patches 09 and 10, move pagecache_isize_extended() out of an\n active journal handle as well to prevent opposite lock ordering.\n This was pointed out by Sashiko.\n - In patch 11, add a check for IOCB_NOWAIT, which was also pointed out\n by Sashiko.\n\nChanges since v1:\n - In patch 04, rename ext4_block_get_zero_range() to\n ext4_load_tail_bh() and drop the unused 'length' parameter as Jan\n suggested.\n - In patch 06, modify the commit message, add another reason to drop\n data=ordered mode when zeroing partial blocks in ext4_punch_hole()\n and ext4_punch_hole() as Jan pointed out.\n - In patch 10, modify the commit message, explain the race condition\n between the buffered write and mmap write that pointed out by Jan.\n - Collect reviewed tags from Jan.\n\nv2: https://lore.kernel.org/linux-ext4/20260325072850.3997161-1-yi.zhang@huaweicloud.com/\nv1: https://lore.kernel.org/linux-ext4/20260310014101.4140698-1-yi.zhang@huaweicloud.com/\n\nOriginal cover letter:\n\nThis patch series extracted from my iomap conversion v2 series[1]. It\nrefactors the ext4 zero partial block code path in preparation for\nconverting buffered I/O to the iomap infrastructure. The main changes\nare:\n\n[1] https://lore.kernel.org/linux-ext4/20260203062523.3869120-1-yi.zhang@huawei.com/\n\n1. Introduce ext4_block_zero_eof(): Extend and rename\n ext4_block_truncate_page() to handle post-EOF partial block zeroing\n for both append writes and truncate operations.\n2. Separate ordered data handling: Move data=ordered mode handling from\n __ext4_block_zero_page_range to ext4_block_zero_eof(). Only truncate\n and post-EOF append write/fallocate paths need ordered data mode,\n hole punching and zero range paths don't need ordered data handling.\n3. Split journal mode handling: Extract\n ext4_block_journalled_zero_range() from\n __ext4_block_zero_page_range() for data=journal mode, leaving\n ext4_block_do_zero_range() for data=ordered/writeback modes.\n4. Refactor ext4_alloc_file_blocks(): Change parameters to loff_t byte\n granularity to simplify callers and prepares removing the zero call\n from the allocation loop for unaligned append writes.\n5. Remove handle parameters: Stop passing handle_t * to zero functions.\n Make ext4_block_journalled_zero_range() start its own handle, and\n move zero operations outside active handles. This is required because\n iomap uses \"folio lock -> transaction start\" lock ordering, opposite\n to the current lock ordering.\n6. Centralize zeroing in ext4_write_checks(): Move all post-EOF partial\n block zeroing to ext4_write_checks() so it applies to both regular\n buffered writes and the upcoming iomap path.\n\nThanks\nYi.\n\nZhang Yi (11):\n ext4: add did_zero output parameter to ext4_block_zero_page_range()\n ext4: rename and extend ext4_block_truncate_page()\n ext4: factor out journalled block zeroing range\n ext4: rename ext4_block_zero_page_range() to ext4_block_zero_range()\n ext4: move ordered data handling out of ext4_block_do_zero_range()\n ext4: remove handle parameters from zero partial block functions\n ext4: pass allocate range as loff_t to ext4_alloc_file_blocks()\n ext4: move zero partial block range functions out of active handle\n ext4: remove ctime/mtime update from ext4_alloc_file_blocks()\n ext4: move pagecache_isize_extended() out of active handle\n ext4: zero post-EOF partial block before appending write\n\n fs/ext4/ext4.h | 5 +-\n fs/ext4/extents.c | 154 +++++++++++++--------------\n fs/ext4/file.c | 17 +++\n fs/ext4/inode.c | 262 ++++++++++++++++++++++++++++------------------\n 4 files changed, 260 insertions(+), 178 deletions(-)" }