From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 37B80311C32 for ; Tue, 2 Dec 2025 12:19:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764677991; cv=none; b=b5YKlBgaK0UI5nxsZvvc6c0xAKklPgqv5l4682VjuTwuk7I0cmr5wlr9Wf8lZLvJrmhKVrMLvuhNhqcxRlCljNTS1e1RnO+JjTA8GqolEsZU+kGOl41wguejGoIY7mFifVIX6g5XF03T+GR1a730uqJdcYJp6fmgzvBgxOoLrRs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764677991; c=relaxed/simple; bh=R3seLI8FNCKCQa9DM0ikgR+asSU/auf6EKY6BL7QVqk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MGi8Bok2Eurs4VR3wfAmNbLmjB2airOs1O3QoBcG5qwfh7joF3JNhl4NSdIle99Ll8ByxfpKWSFCUqmKIwEjbRik/0rkhROvcqUYIJwJPGFsBiVMxNpRj88CZU/zkRVuKEDc5aZ6Xlu/x5lZIXv+FQjfrI9nuDw4VBvGdH6uXg0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=hSz4wxzd; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="hSz4wxzd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1764677989; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MthCLlk49Z7fztmr3dh2cnJW2OPZdngvjA5V3D2wIBA=; b=hSz4wxzdOg53wUNQVKoMyRBBKEuhP+gy/k5mSPq1orfZeFHxwB2Z6DIyygmR30560tSeTT bZjTL11JPHT3Ab1npf2rwhIMhPo4ry6djJJdVGFRYOXK5aA4XHCqtcj5CsbkgfxoB6X343 1rMqNLbWdTO/p8pGBIBfA5GK5OttKwU= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-112-sHeVc-UzPD2AQ5tQ5sN6nw-1; Tue, 02 Dec 2025 07:19:46 -0500 X-MC-Unique: sHeVc-UzPD2AQ5tQ5sN6nw-1 X-Mimecast-MFC-AGG-ID: sHeVc-UzPD2AQ5tQ5sN6nw_1764677985 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 251851956095; Tue, 2 Dec 2025 12:19:45 +0000 (UTC) Received: from localhost (unknown [10.72.116.20]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id AA9F21800876; Tue, 2 Dec 2025 12:19:41 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org Cc: Caleb Sander Mateos , Uday Shankar , Ming Lei Subject: [PATCH V5 01/21] ublk: define ublk_ch_batch_io_fops for the coming feature F_BATCH_IO Date: Tue, 2 Dec 2025 20:18:55 +0800 Message-ID: <20251202121917.1412280-2-ming.lei@redhat.com> In-Reply-To: <20251202121917.1412280-1-ming.lei@redhat.com> References: <20251202121917.1412280-1-ming.lei@redhat.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Introduces the basic structure for a batched I/O feature in the ublk driver. It adds placeholder functions and a new file operations structure, ublk_ch_batch_io_fops, which will be used for fetching and committing I/O commands in batches. Currently, the feature is disabled. Reviewed-by: Caleb Sander Mateos Signed-off-by: Ming Lei --- drivers/block/ublk_drv.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index c2250172de4c..7219ccbd6364 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -254,6 +254,11 @@ static inline struct request *__ublk_check_and_get_req(struct ublk_device *ub, u16 q_id, u16 tag, struct ublk_io *io, size_t offset); static inline unsigned int ublk_req_build_flags(struct request *req); +static inline bool ublk_dev_support_batch_io(const struct ublk_device *ub) +{ + return false; +} + static inline struct ublksrv_io_desc * ublk_get_iod(const struct ublk_queue *ubq, unsigned tag) { @@ -2512,6 +2517,12 @@ static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) return ublk_ch_uring_cmd_local(cmd, issue_flags); } +static int ublk_ch_batch_io_uring_cmd(struct io_uring_cmd *cmd, + unsigned int issue_flags) +{ + return -EOPNOTSUPP; +} + static inline bool ublk_check_ubuf_dir(const struct request *req, int ubuf_dir) { @@ -2618,6 +2629,16 @@ static const struct file_operations ublk_ch_fops = { .mmap = ublk_ch_mmap, }; +static const struct file_operations ublk_ch_batch_io_fops = { + .owner = THIS_MODULE, + .open = ublk_ch_open, + .release = ublk_ch_release, + .read_iter = ublk_ch_read_iter, + .write_iter = ublk_ch_write_iter, + .uring_cmd = ublk_ch_batch_io_uring_cmd, + .mmap = ublk_ch_mmap, +}; + static void ublk_deinit_queue(struct ublk_device *ub, int q_id) { struct ublk_queue *ubq = ub->queues[q_id]; @@ -2778,7 +2799,10 @@ static int ublk_add_chdev(struct ublk_device *ub) if (ret) goto fail; - cdev_init(&ub->cdev, &ublk_ch_fops); + if (ublk_dev_support_batch_io(ub)) + cdev_init(&ub->cdev, &ublk_ch_batch_io_fops); + else + cdev_init(&ub->cdev, &ublk_ch_fops); ret = cdev_device_add(&ub->cdev, dev); if (ret) goto fail; -- 2.47.0