{"id":2223444,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2223444/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260415105505.342358-2-yebin@huaweicloud.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.2/projects/8/?format=json","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":"<20260415105505.342358-2-yebin@huaweicloud.com>","list_archive_url":null,"date":"2026-04-15T10:55:02","name":"[v2,1/4] ext4: register 'orphan_list' procfs","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"24b2480259f1d2fdbfee6458ec5148715ec46e4c","submitter":{"id":85089,"url":"http://patchwork.ozlabs.org/api/1.2/people/85089/?format=json","name":"Ye Bin","email":"yebin@huaweicloud.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260415105505.342358-2-yebin@huaweicloud.com/mbox/","series":[{"id":499966,"url":"http://patchwork.ozlabs.org/api/1.2/series/499966/?format=json","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/patches/2223444/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223444/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","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=172.234.253.10; helo=sea.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15843-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":"Ye Bin ","To":"tytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tlinux-ext4@vger.kernel.org","Cc":"jack@suse.cz","Subject":"[PATCH v2 1/4] ext4: register 'orphan_list' procfs","Date":"Wed, 15 Apr 2026 18:55:02 +0800","Message-Id":"<20260415105505.342358-2-yebin@huaweicloud.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20260415105505.342358-1-yebin@huaweicloud.com>","References":"<20260415105505.342358-1-yebin@huaweicloud.com>","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"_Ch0CgAHtL0fb99pbf70AQ--.45727S5","X-Coremail-Antispam":"1UD129KBjvJXoWxXry3Kr45XrWDXF18Cw47twb_yoWrAFykpF\n\tZ8A34rJa1UWF9xWanxGF4UXrn3t3WxGw1Utr92934aqryaqryktF18t3Wj9F1rJrWUGr13\n\tXa1jgFyUKr4a9FJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUvmb4IE77IF4wAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k2\n\t6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUGw\n\tA2048vs2IY020Ec7CjxVAFwI0_Jrv_JF4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS\n\tw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV\n\tWxJVW8Jr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_\n\tGcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx\n\t0E2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWU\n\tJVW8JwACjcxG0xvY0x0EwIxGrwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJV\n\tW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF\n\t1VAFwI0_JF0_Jw1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6x\n\tIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvE\n\tx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnU\n\tUI43ZEXa7IU14CJJUUUUU==","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 \n\nThis patch register '/proc/fs/ext4/XXX/orphan_list' procfs for show inode\norphan list about EXT4 file system.\nIn actual production environments, there may be inconsistencies in df/du,\nsometimes due to kernel occupation, making it difficult to find such files,\nand it is also difficult to operate in the current network environment. So\nadd \"orphan_list\" procfs to quickly query files that have been deleted but\nare occupied.\n\nSigned-off-by: Ye Bin \n---\n fs/ext4/ext4.h | 1 +\n fs/ext4/orphan.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++\n fs/ext4/sysfs.c | 2 ++\n 3 files changed, 80 insertions(+)","diff":"diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\nindex 0cf68f85dfd1..ccb0fd1e63e7 100644\n--- a/fs/ext4/ext4.h\n+++ b/fs/ext4/ext4.h\n@@ -3875,6 +3875,7 @@ extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);\n extern const struct fsverity_operations ext4_verityops;\n \n /* orphan.c */\n+extern const struct proc_ops ext4_orphan_proc_ops;\n extern int ext4_orphan_add(handle_t *, struct inode *);\n extern int ext4_orphan_del(handle_t *, struct inode *);\n extern void ext4_orphan_cleanup(struct super_block *sb,\ndiff --git a/fs/ext4/orphan.c b/fs/ext4/orphan.c\nindex 64ea47624233..f7e7f77e021e 100644\n--- a/fs/ext4/orphan.c\n+++ b/fs/ext4/orphan.c\n@@ -4,6 +4,8 @@\n #include \n #include \n #include \n+#include \n+#include \n \n #include \"ext4.h\"\n #include \"ext4_jbd2.h\"\n@@ -657,3 +659,78 @@ int ext4_orphan_file_empty(struct super_block *sb)\n \t\t\treturn 0;\n \treturn 1;\n }\n+\n+struct ext4_proc_orphan {\n+\tstruct ext4_inode_info cursor;\n+};\n+\n+static void *ext4_orphan_seq_start(struct seq_file *seq, loff_t *pos)\n+{\n+\treturn NULL;\n+}\n+\n+static void *ext4_orphan_seq_next(struct seq_file *seq, void *v, loff_t *pos)\n+{\n+\treturn NULL;\n+}\n+\n+static int ext4_orphan_seq_show(struct seq_file *seq, void *v)\n+{\n+\treturn 0;\n+}\n+\n+static void ext4_orphan_seq_stop(struct seq_file *seq, void *v)\n+{\n+}\n+\n+const struct seq_operations ext4_orphan_seq_ops = {\n+\t.start = ext4_orphan_seq_start,\n+\t.next = ext4_orphan_seq_next,\n+\t.stop = ext4_orphan_seq_stop,\n+\t.show = ext4_orphan_seq_show,\n+};\n+\n+static int ext4_seq_orphan_open(struct inode *inode, struct file *file)\n+{\n+\tint rc;\n+\tstruct seq_file *m;\n+\tstruct ext4_proc_orphan *private;\n+\n+\trc = seq_open_private(file, &ext4_orphan_seq_ops,\n+\t\t\t sizeof(struct ext4_proc_orphan));\n+\tif (!rc) {\n+\t\tm = file->private_data;\n+\t\tprivate = m->private;\n+\t\tINIT_LIST_HEAD(&private->cursor.i_orphan);\n+\t\tprivate->cursor.vfs_inode.i_ino = 0;\n+\t}\n+\n+\treturn rc;\n+}\n+\n+static int ext4_seq_orphan_release(struct inode *inode, struct file *file)\n+{\n+\tstruct seq_file *seq = file->private_data;\n+\tstruct ext4_proc_orphan *s = seq->private;\n+\tstruct ext4_sb_info *sbi = EXT4_SB(pde_data(inode));\n+\n+\t/*\n+\t * The function close_pdeo() is called when deleting the procfs\n+\t * in ext4_unregister_sysfs(), and this function is used to remove\n+\t * the entry from the 'pde->pde_openers' list. Therefore, when the\n+\t * file is closed, proc_reg_release() will not call close_pdeo()\n+\t * again because it cannot find the node on the 'pde->pde_openers'\n+\t * list. This prevents the UAF issue from occurring.\n+\t */\n+\tmutex_lock(&sbi->s_orphan_lock);\n+\tlist_del(&s->cursor.i_orphan);\n+\tmutex_unlock(&sbi->s_orphan_lock);\n+\n+\treturn seq_release_private(inode, file);\n+}\n+\n+const struct proc_ops ext4_orphan_proc_ops = {\n+\t.proc_open = ext4_seq_orphan_open,\n+\t.proc_read = seq_read,\n+\t.proc_release = ext4_seq_orphan_release,\n+};\ndiff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c\nindex 923b375e017f..b40a934e30c9 100644\n--- a/fs/ext4/sysfs.c\n+++ b/fs/ext4/sysfs.c\n@@ -639,6 +639,8 @@ int ext4_register_sysfs(struct super_block *sb)\n \t\t\t\text4_seq_mb_stats_show, sb);\n \t\tproc_create_seq_data(\"mb_structs_summary\", 0444, sbi->s_proc,\n \t\t\t\t&ext4_mb_seq_structs_summary_ops, sb);\n+\t\tproc_create_data(\"orphan_list\", 0400, sbi->s_proc,\n+\t\t\t\t &ext4_orphan_proc_ops, sb);\n \t}\n \treturn 0;\n }\n","prefixes":["v2","1/4"]}