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GET /api/1.1/patches/2224871/?format=api
{ "id": 2224871, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2224871/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260419063436.17999-3-liubaolin12138@163.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/1.1/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 }, "msgid": "<20260419063436.17999-3-liubaolin12138@163.com>", "date": "2026-04-19T06:34:36", "name": "[v2,v2,2/2] ext4: allow clearing mballoc stats through mb_stats", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "dc8cdcd8bc6db7d804ab0b323aab208065f5c1d7", "submitter": { "id": 89479, "url": "http://patchwork.ozlabs.org/api/1.1/people/89479/?format=api", "name": "Baolin Liu", "email": "liubaolin12138@163.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260419063436.17999-3-liubaolin12138@163.com/mbox/", "series": [ { "id": 500484, "url": "http://patchwork.ozlabs.org/api/1.1/series/500484/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=500484", "date": "2026-04-19T06:34:34", "name": "add blocks_allocated to mb_stats and clear mb_stats", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/500484/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224871/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224871/checks/", "tags": {}, "headers": { "Return-Path": "\n <SRS0=DdtI=CS=vger.kernel.org=linux-ext4+bounces-15904-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\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=BORXkzTC;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; 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arc=none smtp.client-ip=117.135.210.2" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com;\n\ts=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=E9\n\tAclkEwYTBKthkg3Pap5rseCoa48EkPaTwn3i5g9gs=; b=BORXkzTCjzHuf8KvXw\n\tG8oWLq1l/4UVELyuiKBfeoUKdaZ3MeDs+qjdDVQiP3eMeWbIEgeZ8uQYEYNL7kcd\n\t50S2nZCyEM26sCYbDV9U07cEmpShicBDaNroTndoc9MHgybFam++GHoM9mk3lgbs\n\ta0P0o1jQLI7W2a5idsbrYkE48=", "From": "Baolin Liu <liubaolin12138@163.com>", "To": "tytso@mit.edu,\n\tadilger.kernel@dilger.ca", "Cc": "wangguanyu@vivo.com,\n\tliubaolin12138@163.com,\n\tyi.zhang@huaweicloud.com,\n\tritesh.list@gmail.com,\n\tojaswin@linux.ibm.com,\n\tlinux-ext4@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tBaolin Liu <liubaolin@kylinos.cn>", "Subject": "[PATCH v2 v2 2/2] ext4: allow clearing mballoc stats through mb_stats", "Date": "Sun, 19 Apr 2026 14:34:36 +0800", "Message-ID": "<20260419063436.17999-3-liubaolin12138@163.com>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260419063436.17999-1-liubaolin12138@163.com>", "References": "<20260419063436.17999-1-liubaolin12138@163.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": "PigvCgBHBQKBd+Rp1PA9Ag--.97S4", "X-Coremail-Antispam": "1Uf129KBjvJXoWxCFyUtFW3uFyDtF4UWr1kGrg_yoWrCrW7pF\n\ts8Za15Gr4UW3Wxuws3GF4fZwn093W0k34UtrWSv34rCryagryrJFnYqFyjyFyYqrWUJ3Wk\n\tXa1q934DWr4xKa7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0zMMKZUUUUUU=", "X-CM-SenderInfo": "xolxutxrol0iasrtmqqrwthudrp/xtbC6hiXYmnkd5gOhAAA3v", "X-Spam-Status": "No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY\n\tautolearn=disabled version=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "From: Baolin Liu <liubaolin@kylinos.cn>\n\nMake /proc/fs/ext4/<dev>/mb_stats writable and clear the runtime\nmballoc statistics when 0 is written.\n\nSigned-off-by: Baolin Liu <liubaolin@kylinos.cn>\n---\n fs/ext4/ext4.h | 1 +\n fs/ext4/mballoc.c | 29 +++++++++++++++++++++++++++++\n fs/ext4/sysfs.c | 40 ++++++++++++++++++++++++++++++++++++++--\n 3 files changed, 68 insertions(+), 2 deletions(-)", "diff": "diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\nindex 293f698b7042..3223e73612ae 100644\n--- a/fs/ext4/ext4.h\n+++ b/fs/ext4/ext4.h\n@@ -2994,6 +2994,7 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,\n extern const struct seq_operations ext4_mb_seq_groups_ops;\n extern const struct seq_operations ext4_mb_seq_structs_summary_ops;\n extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);\n+extern void ext4_mb_stats_clear(struct ext4_sb_info *sbi);\n extern int ext4_mb_init(struct super_block *);\n extern void ext4_mb_release(struct super_block *);\n extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,\ndiff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c\nindex 1e13ef62cb9d..79ddfa935813 100644\n--- a/fs/ext4/mballoc.c\n+++ b/fs/ext4/mballoc.c\n@@ -4723,6 +4723,35 @@ static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)\n \t\ttrace_ext4_mballoc_prealloc(ac);\n }\n \n+void ext4_mb_stats_clear(struct ext4_sb_info *sbi)\n+{\n+\tint i;\n+\n+\tatomic_set(&sbi->s_bal_reqs, 0);\n+\tatomic_set(&sbi->s_bal_success, 0);\n+\tatomic_set(&sbi->s_bal_allocated, 0);\n+\tatomic_set(&sbi->s_bal_groups_scanned, 0);\n+\n+\tfor (i = 0; i < EXT4_MB_NUM_CRS; i++) {\n+\t\tatomic64_set(&sbi->s_bal_cX_hits[i], 0);\n+\t\tatomic64_set(&sbi->s_bal_cX_groups_considered[i], 0);\n+\t\tatomic_set(&sbi->s_bal_cX_ex_scanned[i], 0);\n+\t\tatomic64_set(&sbi->s_bal_cX_failed[i], 0);\n+\t}\n+\n+\tatomic_set(&sbi->s_bal_ex_scanned, 0);\n+\tatomic_set(&sbi->s_bal_goals, 0);\n+\tatomic_set(&sbi->s_bal_stream_goals, 0);\n+\tatomic_set(&sbi->s_bal_len_goals, 0);\n+\tatomic_set(&sbi->s_bal_2orders, 0);\n+\tatomic_set(&sbi->s_bal_breaks, 0);\n+\tatomic_set(&sbi->s_mb_lost_chunks, 0);\n+\tatomic_set(&sbi->s_mb_buddies_generated, 0);\n+\tatomic64_set(&sbi->s_mb_generation_time, 0);\n+\tatomic_set(&sbi->s_mb_preallocated, 0);\n+\tatomic_set(&sbi->s_mb_discarded, 0);\n+}\n+\n /*\n * Called on failure; free up any blocks from the inode PA for this\n * context. We don't need this for MB_GROUP_PA because we only change\ndiff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c\nindex b87d7bdab06a..e90885d470ab 100644\n--- a/fs/ext4/sysfs.c\n+++ b/fs/ext4/sysfs.c\n@@ -52,6 +52,42 @@ typedef enum {\n static const char proc_dirname[] = \"fs/ext4\";\n static struct proc_dir_entry *ext4_proc_root;\n \n+static int ext4_mb_stats_open(struct inode *inode, struct file *file)\n+{\n+\treturn single_open(file, ext4_seq_mb_stats_show, pde_data(inode));\n+}\n+\n+static ssize_t ext4_mb_stats_write(struct file *file, const char __user *buf,\n+\t\t\t\t\t size_t count, loff_t *ppos)\n+{\n+\tstruct super_block *sb = pde_data(file_inode(file));\n+\tchar kbuf[2];\n+\n+\tif (count == 0 || count > sizeof(kbuf))\n+\t\treturn -EINVAL;\n+\n+\tif (copy_from_user(kbuf, buf, count))\n+\t\treturn -EFAULT;\n+\n+\tif (count == 2) {\n+\t\tif (kbuf[0] != '0' || kbuf[1] != '\\n')\n+\t\t\treturn -EINVAL;\n+\t} else if (kbuf[0] != '0') {\n+\t\treturn -EINVAL;\n+\t}\n+\n+\text4_mb_stats_clear(EXT4_SB(sb));\n+\treturn count;\n+}\n+\n+static const struct proc_ops ext4_mb_stats_proc_ops = {\n+\t.proc_open\t= ext4_mb_stats_open,\n+\t.proc_read\t= seq_read,\n+\t.proc_lseek\t= seq_lseek,\n+\t.proc_release\t= single_release,\n+\t.proc_write\t= ext4_mb_stats_write,\n+};\n+\n struct ext4_attr {\n \tstruct attribute attr;\n \tshort attr_id;\n@@ -630,8 +666,8 @@ int ext4_register_sysfs(struct super_block *sb)\n \t\t\t\t\text4_fc_info_show, sb);\n \t\tproc_create_seq_data(\"mb_groups\", S_IRUGO, sbi->s_proc,\n \t\t\t\t&ext4_mb_seq_groups_ops, sb);\n-\t\tproc_create_single_data(\"mb_stats\", 0444, sbi->s_proc,\n-\t\t\t\text4_seq_mb_stats_show, sb);\n+\t\tproc_create_data(\"mb_stats\", 0644, sbi->s_proc,\n+\t\t\t\t &ext4_mb_stats_proc_ops, 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}\n", "prefixes": [ "v2", "v2", "2/2" ] }