From patchwork Tue Mar 18 07:35:43 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Yi X-Patchwork-Id: 14020465 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (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 08DFF205AA4 for ; Tue, 18 Mar 2025 07:44:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742283860; cv=none; b=B45dAok/sJi4fTHrgCFtbxZZgKoGYxr0ucst9tFmYuZuCVAKXis/rq2cxGerKhYjBZRqRX6m57srfJYpX58Uq3wp1zG86mt9f0+wI7WP3oYXYQUG9HG8gynDoJ6KsanjCx898Uem/td2xFPsMGtUBaLvq8t1ngUFpnNTRK3sR8I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742283860; c=relaxed/simple; bh=D4yvQuOrva3N4RqMW+Z7bBekFXn+bqMagBn05Fj76rw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gCxb7lP83H679hpH/q+GDRagatgonYYzTFg8vC2d9tr58qy8doZ4hCR6zUT8sd/+9SlLd1V9pFbOs/1I2znryh1kgcKq9ob+ObLpsqmHeoVGdDhO8P5wXpS4N1flIkiMZoPO5M76ErgPC9a+u2xno+kwkKRQPmM/EMunmkrCBkI= 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=45.249.212.51 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 [172.19.93.142]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4ZH3kP5fjPz4f3k6M for ; Tue, 18 Mar 2025 15:43:57 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 115651A0E8E for ; Tue, 18 Mar 2025 15:44:15 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.112.188]) by APP4 (Coremail) with SMTP id gCh0CgCH6189JNlnEt1YGw--.55732S12; Tue, 18 Mar 2025 15:44:14 +0800 (CST) From: Zhang Yi To: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-block@vger.kernel.org, dm-devel@lists.linux.dev, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org Cc: linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, hch@lst.de, tytso@mit.edu, djwong@kernel.org, john.g.garry@oracle.com, bmarzins@redhat.com, chaitanyak@nvidia.com, shinichiro.kawasaki@wdc.com, yi.zhang@huawei.com, yi.zhang@huaweicloud.com, chengzhihao1@huawei.com, yukuai3@huawei.com, yangerkun@huawei.com Subject: [RFC PATCH -next v3 08/10] block: add FALLOC_FL_WRITE_ZEROES support Date: Tue, 18 Mar 2025 15:35:43 +0800 Message-ID: <20250318073545.3518707-9-yi.zhang@huaweicloud.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20250318073545.3518707-1-yi.zhang@huaweicloud.com> References: <20250318073545.3518707-1-yi.zhang@huaweicloud.com> Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: gCh0CgCH6189JNlnEt1YGw--.55732S12 X-Coremail-Antispam: 1UD129KBjvJXoW7Zry7Wr4xCr18Cw13ury3Arb_yoW8WFykpF WDJF1rJFZ5Was7X3WfCF4DuFyYya1kJrWrGayI93Z5uwsxXF97Krn8WF45KryUWFy5Aws8 ZF909r98uF17ArDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUma14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr1j6r xdM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0D M2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjx v20xvE14v26r126r1DMcIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1l F7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E8cxan2 IY04v7MxkF7I0En4kS14v26r4a6rW5MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY 6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17 CEb7AF67AKxVW8ZVWrXwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26ryj6F1UMIIF 0xvE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCw CI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4UJVWxJrUvcSsG vfC2KfnxnUUI43ZEXa7sRitxhPUUUUU== X-CM-SenderInfo: d1lo6xhdqjqx5xdzvxpfor3voofrz/ From: Zhang Yi Add support for FALLOC_FL_WRITE_ZEROES. It directly calls blkdev_issue_zeroout() with flags set to 0. The underlying process will attempt to use the fastest method for issuing zeroes. First, the block layer will try to issue a write zeroes command if the storage device supports it; if not, it will fall back to issuing zeroed data. Then, the storage device driver may attempt to submit an unmap write zero command if the device supports it; if not, the driver may fall back to submitting a no-unmap write zeroes command. Signed-off-by: Zhang Yi --- block/fops.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/block/fops.c b/block/fops.c index be9f1dbea9ce..5a519581d7e3 100644 --- a/block/fops.c +++ b/block/fops.c @@ -803,7 +803,7 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) #define BLKDEV_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ - FALLOC_FL_ZERO_RANGE) + FALLOC_FL_ZERO_RANGE | FALLOC_FL_WRITE_ZEROES) static long blkdev_fallocate(struct file *file, int mode, loff_t start, loff_t len) @@ -862,6 +862,15 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start, len >> SECTOR_SHIFT, GFP_KERNEL, BLKDEV_ZERO_NOFALLBACK); break; + case FALLOC_FL_WRITE_ZEROES: + error = truncate_bdev_range(bdev, file_to_blk_mode(file), start, end); + if (error) + goto fail; + + error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT, + len >> SECTOR_SHIFT, GFP_KERNEL, + 0); + break; default: error = -EOPNOTSUPP; }