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GET /api/1.2/patches/2234995/?format=api
{ "id": 2234995, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2234995/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260508121539.4174601-17-libaokun@linux.alibaba.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": "<20260508121539.4174601-17-libaokun@linux.alibaba.com>", "list_archive_url": null, "date": "2026-05-08T12:15:38", "name": "[RFC,16/17] ext4: extract ext4_update_inode_group_desc() to reduce duplication", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "411a4bc414cf1932afe0368c4ea5b8975bd8fcb8", "submitter": { "id": 92757, "url": "http://patchwork.ozlabs.org/api/1.2/people/92757/?format=api", "name": "Baokun Li", "email": "libaokun@linux.alibaba.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260508121539.4174601-17-libaokun@linux.alibaba.com/mbox/", "series": [ { "id": 503377, "url": "http://patchwork.ozlabs.org/api/1.2/series/503377/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=503377", "date": "2026-05-08T12:15:22", "name": "ext4/lib-crc: LBS performance part 1 - incremental CRC32c for bitmap checksums", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/503377/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2234995/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2234995/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=ZYre=DF=vger.kernel.org=linux-ext4+bounces-16373-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=linux.alibaba.com header.i=@linux.alibaba.com\n header.a=rsa-sha256 header.s=default header.b=UMSTwu8G;\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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a=rsa-sha256; c=relaxed/relaxed;\n\td=linux.alibaba.com; s=default;\n\tt=1778242572; h=From:To:Subject:Date:Message-ID:MIME-Version;\n\tbh=dB3zSaZqP7/b8wHGDUalrkHyVRQutKa9azzVpRzhLnQ=;\n\tb=UMSTwu8GwEjITJsF8pcxMkH2p9jJQzaDSRC0PknV2dbkId9htebVKxzq5ANYfoaAXc0vaxxeMg1/OL9FPQ6Xy99UQO4Ygy8SKilcWMUEWZeQGVyzICB3aZxhaA97JzzMpFKLPtIigjNg14WMKDzzGvw/D0kcHq07GDwszfwo1oQ=", "X-Alimail-AntiSpam": "\n AC=PASS;BC=-1|-1;BR=01201311R161e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045098064;MF=libaokun@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0X2XQgre_1778242571;", "From": "Baokun Li <libaokun@linux.alibaba.com>", "To": "linux-ext4@vger.kernel.org", "Cc": "linux-crypto@vger.kernel.org,\n\tebiggers@kernel.org,\n\tardb@kernel.org,\n\ttytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tjack@suse.cz,\n\tyi.zhang@huawei.com,\n\tojaswin@linux.ibm.com,\n\tritesh.list@gmail.com,\n\tBaokun Li <libaokun@linux.alibaba.com>", "Subject": "[PATCH RFC 16/17] ext4: extract ext4_update_inode_group_desc() to\n reduce duplication", "Date": "Fri, 8 May 2026 20:15:38 +0800", "Message-ID": "<20260508121539.4174601-17-libaokun@linux.alibaba.com>", "X-Mailer": "git-send-email 2.43.7", "In-Reply-To": "<20260508121539.4174601-1-libaokun@linux.alibaba.com>", "References": "<20260508121539.4174601-1-libaokun@linux.alibaba.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-Spam-Status": "No, score=-8.7 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tHEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,\n\tSPF_PASS,UNPARSEABLE_RELAY,USER_IN_DEF_DKIM_WL autolearn=disabled\n\tversion=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "ext4_mark_inode_used() and __ext4_new_inode() contain nearly\nidentical code blocks for updating group descriptor fields after\ninode allocation (UNINIT flag clearing, itable_unused update,\ninode bitmap checksum, group desc checksum). Extract the common\nlogic into ext4_update_inode_group_desc() to eliminate duplication.\n\nSigned-off-by: Baokun Li <libaokun@linux.alibaba.com>\n---\n fs/ext4/ialloc.c | 136 ++++++++++++++++++++---------------------------\n 1 file changed, 57 insertions(+), 79 deletions(-)", "diff": "diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c\nindex 9dd1cdb367ba..25430c572818 100644\n--- a/fs/ext4/ialloc.c\n+++ b/fs/ext4/ialloc.c\n@@ -808,12 +808,63 @@ static int ext4_might_init_block_bitmap(handle_t *handle,\n \treturn err;\n }\n \n+/*\n+ * Update group descriptor checksums and itable_unused after allocating\n+ * inode @bit (0-based relative inode number within the group).\n+ * Must be called with the group lock held.\n+ */\n+static void ext4_update_inode_group_desc(struct super_block *sb,\n+\t\t\t\t\t ext4_group_t group,\n+\t\t\t\t\t struct ext4_group_desc *gdp,\n+\t\t\t\t\t struct buffer_head *inode_bitmap_bh,\n+\t\t\t\t\t int bit, umode_t mode)\n+{\n+\tint free;\n+\tstruct ext4_sb_info *sbi = EXT4_SB(sb);\n+\tbool fast_crc = true;\n+\n+\text4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);\n+\tif (S_ISDIR(mode)) {\n+\t\text4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1);\n+\t\tif (sbi->s_log_groups_per_flex) {\n+\t\t\text4_group_t f = ext4_flex_group(sbi, group);\n+\n+\t\t\tatomic_inc(&sbi_array_rcu_deref(sbi, s_flex_groups,\n+\t\t\t\t\t\t\tf)->used_dirs);\n+\t\t}\n+\t}\n+\n+\tif (!ext4_has_group_desc_csum(sb))\n+\t\treturn;\n+\n+\tfree = EXT4_INODES_PER_GROUP(sb) - ext4_itable_unused_count(sb, gdp);\n+\tif (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {\n+\t\tgdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);\n+\t\tfree = 0;\n+\t\t/* Incremental CRC needs a valid checksum baseline */\n+\t\tfast_crc = false;\n+\t}\n+\n+\t/*\n+\t * Check the relative inode number against the last used\n+\t * relative inode number in this group. If it is greater\n+\t * we need to update the bg_itable_unused count.\n+\t */\n+\tif (bit >= free)\n+\t\text4_itable_unused_set(sb, gdp,\n+\t\t\t\t EXT4_INODES_PER_GROUP(sb) - bit - 1);\n+\tif (fast_crc)\n+\t\text4_inode_bitmap_csum_set_fast(sb, gdp, bit);\n+\telse\n+\t\text4_inode_bitmap_csum_set(sb, gdp, inode_bitmap_bh);\n+\text4_group_desc_csum_set(sb, group, gdp);\n+}\n+\n int ext4_mark_inode_used(struct super_block *sb, int ino, umode_t mode)\n {\n \tunsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);\n \tstruct buffer_head *inode_bitmap_bh = NULL, *group_desc_bh = NULL;\n \tstruct ext4_group_desc *gdp;\n-\tstruct ext4_sb_info *sbi = EXT4_SB(sb);\n \text4_group_t group;\n \tint bit;\n \tint err;\n@@ -848,44 +899,8 @@ int ext4_mark_inode_used(struct super_block *sb, int ino, umode_t mode)\n \text4_set_bit(bit, inode_bitmap_bh->b_data);\n \n \t/* Update the relevant bg descriptor fields */\n-\text4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);\n-\tif (S_ISDIR(mode)) {\n-\t\text4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1);\n-\t\tif (sbi->s_log_groups_per_flex) {\n-\t\t\text4_group_t f = ext4_flex_group(sbi, group);\n-\n-\t\t\tatomic_inc(&sbi_array_rcu_deref(sbi, s_flex_groups,\n-\t\t\t\t\t\t\tf)->used_dirs);\n-\t\t}\n-\t}\n-\n-\tif (ext4_has_group_desc_csum(sb)) {\n-\t\tbool fast_crc = true;\n-\t\tint free = EXT4_INODES_PER_GROUP(sb) -\n-\t\t\t\text4_itable_unused_count(sb, gdp);\n-\n-\t\tif (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {\n-\t\t\tgdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);\n-\t\t\tfree = 0;\n-\t\t\t/* Incremental CRC needs a valid checksum baseline */\n-\t\t\tfast_crc = false;\n-\t\t}\n-\n-\t\t/*\n-\t\t * Check the relative inode number against the last used\n-\t\t * relative inode number in this group. if it is greater\n-\t\t * we need to update the bg_itable_unused count\n-\t\t */\n-\t\tif (bit >= free)\n-\t\t\text4_itable_unused_set(sb, gdp,\n-\t\t\t\t\t(EXT4_INODES_PER_GROUP(sb) - bit - 1));\n-\t\tif (fast_crc)\n-\t\t\text4_inode_bitmap_csum_set_fast(sb, gdp, bit);\n-\t\telse\n-\t\t\text4_inode_bitmap_csum_set(sb, gdp, inode_bitmap_bh);\n-\t\text4_group_desc_csum_set(sb, group, gdp);\n-\t}\n-\n+\text4_update_inode_group_desc(sb, group, gdp,\n+\t\t\t\t inode_bitmap_bh, bit, mode);\n \text4_unlock_group(sb, group);\n \n \tBUFFER_TRACE(inode_bitmap_bh, \"call ext4_handle_dirty_metadata\");\n@@ -1165,50 +1180,13 @@ struct inode *__ext4_new_inode(struct mnt_idmap *idmap,\n \t\t\t\tret2 = 0;\n \t\t\t} else {\n \t\t\t\tret2 = 1; /* we didn't grab the inode */\n-\t\t\t\tgoto unlock_group;\n \t\t\t}\n \t\t}\n \n \t\t/* Update the relevant bg descriptor fields */\n-\t\text4_free_inodes_set(sb, gdp,\n-\t\t\t\t ext4_free_inodes_count(sb, gdp) - 1);\n-\t\tif (S_ISDIR(mode)) {\n-\t\t\text4_used_dirs_set(sb, gdp,\n-\t\t\t\t\t ext4_used_dirs_count(sb, gdp) + 1);\n-\t\t\tif (sbi->s_log_groups_per_flex) {\n-\t\t\t\text4_group_t f = ext4_flex_group(sbi, group);\n-\t\t\t\tatomic_inc(&sbi_array_rcu_deref(sbi, s_flex_groups,\n-\t\t\t\t\t\t\t\tf)->used_dirs);\n-\t\t\t}\n-\t\t}\n-\n-\t\tif (ext4_has_group_desc_csum(sb)) {\n-\t\t\tbool fast_crc = true;\n-\t\t\tint free = EXT4_INODES_PER_GROUP(sb) -\n-\t\t\t\t\text4_itable_unused_count(sb, gdp);\n-\n-\t\t\tif (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {\n-\t\t\t\tgdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);\n-\t\t\t\tfree = 0;\n-\t\t\t\t/* Incremental CRC needs a valid csum baseline */\n-\t\t\t\tfast_crc = false;\n-\t\t\t}\n-\t\t\t/*\n-\t\t\t * Check the relative inode number against the\n-\t\t\t * last used relative inode number in this group.\n-\t\t\t * If it is greater we need to update the\n-\t\t\t * bg_itable_unused count.\n-\t\t\t */\n-\t\t\tif (bit >= free)\n-\t\t\t\text4_itable_unused_set(sb, gdp,\n-\t\t\t\t\tEXT4_INODES_PER_GROUP(sb) - bit - 1);\n-\t\t\tif (fast_crc)\n-\t\t\t\text4_inode_bitmap_csum_set_fast(sb, gdp, bit);\n-\t\t\telse\n-\t\t\t\text4_inode_bitmap_csum_set(sb, gdp, inode_bitmap_bh);\n-\t\t\text4_group_desc_csum_set(sb, group, gdp);\n-\t\t}\n-unlock_group:\n+\t\tif (!ret2)\n+\t\t\text4_update_inode_group_desc(sb, group, gdp,\n+\t\t\t\t\t\t inode_bitmap_bh, bit, mode);\n \t\text4_unlock_group(sb, group);\n \t\tif (ext4_has_group_desc_csum(sb) &&\n \t\t !(sbi->s_mount_state & EXT4_FC_REPLAY))\n", "prefixes": [ "RFC", "16/17" ] }