From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 993EA27AC4C; Wed, 25 Mar 2026 07:33:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774424028; cv=none; b=iidLM3eQbM/kBJHnjdwOs26yiGb0zZu53qecSu9IWYDcMMi7A5j4KQkWuZP3jUCJucXiESlsOripqJoTCZN8GHDjBti1H7GgegyIJ5TWu2pzSHnZByk6nGObBIEogiAulIE/3YZyh6YhJLwIrja43gSetzQYMeBBJCOxIpB6IiU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774424028; c=relaxed/simple; bh=KKd39nSq2/Q+ECUd1egjak+o/qKi+d5in9fXewxY3bc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kQzHJrPcr/RSQpn7PgKZ1uF5Nbg2AT48RpTbP+BmvkrINhLxZMX3G95/RyLOnPMIhADVRfPopu9QXgSB1Hr5UQ+1C/qDVuR4oiLYWxeExyiMk3t3nIk2sy1gqtEbV5z9j2puaVxz3JmQJMJhb1jotvUDlVfNW9pht79b3Y6lqe0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.198]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4fgdt46mQTzKHMYn; Wed, 25 Mar 2026 15:33:00 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id 4876740575; Wed, 25 Mar 2026 15:33:39 +0800 (CST) Received: from huaweicloud.com (unknown [10.50.85.155]) by APP1 (Coremail) with SMTP id cCh0CgAHC9vFj8NpuR6cCA--.49898S6; Wed, 25 Mar 2026 15:33:39 +0800 (CST) From: Zhang Yi To: linux-ext4@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca, jack@suse.cz, ojaswin@linux.ibm.com, ritesh.list@gmail.com, libaokun@linux.alibaba.com, yi.zhang@huawei.com, yi.zhang@huaweicloud.com, yizhang089@gmail.com, yangerkun@huawei.com, yukuai@fnnas.com Subject: [PATCH v2 02/10] ext4: ext4_block_truncate_page() returns zeroed length on success Date: Wed, 25 Mar 2026 15:28:41 +0800 Message-ID: <20260325072850.3997161-3-yi.zhang@huaweicloud.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260325072850.3997161-1-yi.zhang@huaweicloud.com> References: <20260325072850.3997161-1-yi.zhang@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:cCh0CgAHC9vFj8NpuR6cCA--.49898S6 X-Coremail-Antispam: 1UD129KBjvJXoWxJrWrXFW3Jw4xWFyUWF1xZrb_yoW8AFykpr 98K3yrGr4Dua4q9an29F1aqr1ak3WfGFW8Way7K34Y934fXF1xKF93KF1Fva1jqrWxXayj qF45tFWa9w17A3DanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUm014x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jryl82xGYIkIc2 x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJw A2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq3wAS 0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2 IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0 Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2kIc2 xKxwCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWU JVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67 kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY 6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0x vEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVj vjDU0xZFpf9x0JUADGOUUUUU= X-CM-SenderInfo: d1lo6xhdqjqx5xdzvxpfor3voofrz/ From: Zhang Yi Return the actual zeroed length instead of 0 on success. This prepares for the upcoming iomap buffered I/O conversion by exposing zeroed length information to callers. Signed-off-by: Zhang Yi Reviewed-by: Jan Kara --- fs/ext4/inode.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 1c9474d5d11d..f21be26b4642 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4136,6 +4136,7 @@ static int ext4_block_zero_page_range(handle_t *handle, * up to the end of the block which corresponds to `from'. * This required during truncate. We need to physically zero the tail end * of that block so it doesn't yield old data if the file is later grown. + * Return the zeroed length on success. */ static int ext4_block_truncate_page(handle_t *handle, struct address_space *mapping, loff_t from) @@ -4143,6 +4144,8 @@ static int ext4_block_truncate_page(handle_t *handle, unsigned length; unsigned blocksize; struct inode *inode = mapping->host; + bool did_zero = false; + int err; /* If we are processing an encrypted inode during orphan list handling */ if (IS_ENCRYPTED(inode) && !fscrypt_has_encryption_key(inode)) @@ -4151,7 +4154,12 @@ static int ext4_block_truncate_page(handle_t *handle, blocksize = i_blocksize(inode); length = blocksize - (from & (blocksize - 1)); - return ext4_block_zero_page_range(handle, mapping, from, length, NULL); + err = ext4_block_zero_page_range(handle, mapping, from, length, + &did_zero); + if (err) + return err; + + return did_zero ? length : 0; } int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, -- 2.52.0