{"id":2234981,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2234981/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260508121539.4174601-11-libaokun@linux.alibaba.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":"<20260508121539.4174601-11-libaokun@linux.alibaba.com>","list_archive_url":null,"date":"2026-05-08T12:15:32","name":"[RFC,10/17] ext4: use fast incremental CRC update in ext4_free_inode()","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"ad5d82c28095f0751da4d6d2bdbed6c645b55e33","submitter":{"id":92757,"url":"http://patchwork.ozlabs.org/api/1.2/people/92757/?format=json","name":"Baokun Li","email":"libaokun@linux.alibaba.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260508121539.4174601-11-libaokun@linux.alibaba.com/mbox/","series":[{"id":503377,"url":"http://patchwork.ozlabs.org/api/1.2/series/503377/?format=json","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/2234981/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2234981/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\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=h3SnqpWM;\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=1778242568; h=From:To:Subject:Date:Message-ID:MIME-Version;\n\tbh=Rlokru3c3o+OyN0sDITif8sT6fm26WlVenfbU5I/VP4=;\n\tb=h3SnqpWMoVMXg0B4ZK3CW/6o5zc+4q+1JwvmR2qmtL+l7myx0l/RzZhKDFwcFIzU96g9gF1ldg9Mwiz+5GjV5Zu5wNy0F+XRpb6YRYtAeUwKlBxNfz7uTuWjtl4bGcDd6RLhBlBe8IYV0p9Cvxm1144SMG8jDkQnbp9eTip/7RM=","X-Alimail-AntiSpam":"\n AC=PASS;BC=-1|-1;BR=01201311R841e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037033178;MF=libaokun@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0X2XQgqK_1778242567;","From":"Baokun Li ","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 ","Subject":"[PATCH RFC 10/17] ext4: use fast incremental CRC update in\n ext4_free_inode()","Date":"Fri, 8 May 2026 20:15:32 +0800","Message-ID":"<20260508121539.4174601-11-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":"","List-Subscribe":"","List-Unsubscribe":"","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":"Replace ext4_inode_bitmap_csum_set() with the newly added\next4_inode_bitmap_csum_set_fast() in ext4_free_inode() for incremental\ninode bitmap checksum update.\n\nThis is safe because:\n - At inode free time, the inode bitmap checksum has already been\n initialized, so the old checksum is always valid.\n - The bitmap buffer modification and checksum update are protected\n by the same group lock, ensuring the old checksum is consistent\n with the bitmap content before the bit flip.\n\nSigned-off-by: Baokun Li \n---\n fs/ext4/ialloc.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)","diff":"diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c\nindex 3fd8f0099852..55eb69fbb4c9 100644\n--- a/fs/ext4/ialloc.c\n+++ b/fs/ext4/ialloc.c\n@@ -327,7 +327,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)\n \t\tif (percpu_counter_initialized(&sbi->s_dirs_counter))\n \t\t\tpercpu_counter_dec(&sbi->s_dirs_counter);\n \t}\n-\text4_inode_bitmap_csum_set(sb, gdp, bitmap_bh);\n+\text4_inode_bitmap_csum_set_fast(sb, gdp, bit);\n \text4_group_desc_csum_set(sb, block_group, gdp);\n \text4_unlock_group(sb, block_group);\n \n","prefixes":["RFC","10/17"]}