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{ "id": 2223446, "url": "http://patchwork.ozlabs.org/api/1.2/covers/2223446/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260415105505.342358-1-yebin@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": "<20260415105505.342358-1-yebin@huaweicloud.com>", "list_archive_url": null, "date": "2026-04-15T10:55:01", "name": "[v2,0/4] show orphan file inode detail info", "submitter": { "id": 85089, "url": "http://patchwork.ozlabs.org/api/1.2/people/85089/?format=api", "name": "Ye Bin", "email": "yebin@huaweicloud.com" }, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260415105505.342358-1-yebin@huaweicloud.com/mbox/", "series": [ { "id": 499966, "url": "http://patchwork.ozlabs.org/api/1.2/series/499966/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=499966", "date": "2026-04-15T10:55:03", "name": "show orphan file inode detail info", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/499966/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2223446/comments/", "headers": { "Return-Path": "\n <SRS0=h4sK=CO=vger.kernel.org=linux-ext4+bounces-15844-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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gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15844-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": "Ye Bin <yebin@huaweicloud.com>", "To": "tytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tlinux-ext4@vger.kernel.org", "Cc": "jack@suse.cz", "Subject": "[PATCH v2 0/4] show orphan file inode detail info", "Date": "Wed, 15 Apr 2026 18:55:01 +0800", "Message-Id": "<20260415105505.342358-1-yebin@huaweicloud.com>", "X-Mailer": "git-send-email 2.34.1", "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": "_Ch0CgAHtL0fb99pbf70AQ--.45727S4", "X-Coremail-Antispam": "1UD129KBjvJXoW7uF4UuFWxCF17Aw4rGr17ZFb_yoW8KFy3pa\n\t9xCw45t3WDJasIkrs3A3WxXFyrKFn3Gw45Gr1agryUt398WrZYgr1xK3yY9a4kCrWfAFn0\n\tqr4jqryj9FyDZaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUglb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k2\n\t6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4\n\tvEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7Cj\n\txVAFwI0_Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I\n\t0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40E\n\tx7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x\n\t0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Y\n\tz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zV\n\tAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4l\n\tIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCw\n\tCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r1j6r4UYxBIdaVF\n\txhVjvjDU0xZFpf9x07UE-erUUUUU=", "X-CM-SenderInfo": "p1hex046kxt4xhlfz01xgou0bp/", "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: Ye Bin <yebin10@huawei.com>\n\nDiffs v2 vs v1:\n(1) Fix sashiko review issues:\nhttps://sashiko.dev/#/patchset/20260403082507.1882703-1-yebin%40huaweicloud.com\n(2) Change \"orphan_list\" file mode from 0444 to 0400;\n(3) The display format of the \"orphan_list\" file is modified according\n to Andreas' suggestions.\nFault injection tests have been conducted to address the issues raised\nin the sashik review. There is no UAF issue in the ext4_seq_orphan_release()\nfunction. The reason for this has already been explained in the code comments.\nIn addition to the fault injection tests, we also performed a stress test by\nobserving the /proc/fs/ext4/XX/orphan_list and the concurrent processes of\nadding and removing orphan nodes, and no issues were found so far.\n\n\nIn actual production environments, the issue of inconsistency between\ndf and du is frequently encountered. In many cases, the cause of the\nproblem can be identified through the use of lsof. However, when\noverlayfs is combined with project quota configuration, the issue becomes\nmore complex and troublesome to diagnose. First, to determine the project\nID, one needs to obtain orphaned nodes using `fsck.ext4 -fn /dev/xx`, and\nthen retrieve file information through `debugfs`. However, the file names\ncannot always be obtained, and it is often unclear which files they are.\nTo identify which files these are, one would need to use crash for online\ndebugging or use kprobe to gather information incrementally. However, some\ncustomers in production environments do not agree to upload any tools, and\nonline debugging might impact the business. There are also scenarios where\nfiles are opened in kernel mode, which do not generate file descriptors(fds),\nmaking it impossible to identify which files were deleted but still have\nreferences through lsof. This patchset adds a procfs interface to query\ninformation about orphaned nodes, which can assist in the analysis and\nlocalization of such issues.\n\nYe Bin (4):\n ext4: register 'orphan_list' procfs\n ext4: skip cursor node in ext4_orphan_del()\n ext4: show inode orphan list detail information\n ext4: show orphan file inode detail info\n\n fs/ext4/ext4.h | 1 +\n fs/ext4/orphan.c | 326 ++++++++++++++++++++++++++++++++++++++++++++++-\n fs/ext4/sysfs.c | 2 +\n 3 files changed, 328 insertions(+), 1 deletion(-)" }