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 B2526328B49 for ; Fri, 16 Jan 2026 14:19:16 +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=1768573159; cv=none; b=X0FRFCGTqGFCR/RpD7UMIf0XHHQa5k8g9hetXK3QFy237ke2VWqeB7xWHaxLmS4CJET5D4oWmlWy878xtR5FFTZH7C0TxsjBlKvKgRNVf5UZyQYITt8F3hwRwFvxuCYF/gk9dssvmCivHIOaFs4FGMkKlnfqjNlylPeJwiWZb3Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768573159; c=relaxed/simple; bh=2gCvFNSUM5zNOY5TNtDET/xUO4NpprvNZd25n4pxBTs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FBbJBKrwn79oWKvbKp3kjzZFkeRCHv3JLk4bXuoN+HuluQkf3LRF9PI7bW9ZwfWW5mreI3eCgoEDRKlM1ghEvUg2yqr7nNXtfCI0+yzqALIBBPCC+LUkJ5aD4++1uDVsnQsjZJbz0aCpoxWh+TzIwJL7v18uerHhBAMqOpxVXJo= 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=Exh7tbgd; 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="Exh7tbgd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1768573154; 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=E1l+w8NQcRuKCFheKrJCsaS7JmnZfpFxc+2BuXevCoQ=; b=Exh7tbgdHxvRrSckjj70J2Dvd4Mf1X+VDZnmIxaN7uHH2FQXoU/gRsFTPXkJREJ//YnBvs Z0jDe8+l2SpUnVUyz+uhmeJh5NvJIR0ZYkZGAlFoXOBjgD+LYnW+22oRpLjFzQOQWo1iSg XK+FsSxil6r2mto3klxB5cOZyjLKR/g= Received: from mx-prod-mc-05.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-652-tz_1txiXP5qeLFA1iePdhg-1; Fri, 16 Jan 2026 09:19:11 -0500 X-MC-Unique: tz_1txiXP5qeLFA1iePdhg-1 X-Mimecast-MFC-AGG-ID: tz_1txiXP5qeLFA1iePdhg_1768573150 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (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-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 21FAC195609F; Fri, 16 Jan 2026 14:19:10 +0000 (UTC) Received: from localhost (unknown [10.72.116.198]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 3E27819560A7; Fri, 16 Jan 2026 14:19:08 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org Cc: Caleb Sander Mateos , Uday Shankar , Ming Lei Subject: [PATCH V6 01/24] ublk: define ublk_ch_batch_io_fops for the coming feature F_BATCH_IO Date: Fri, 16 Jan 2026 22:18:34 +0800 Message-ID: <20260116141859.719929-2-ming.lei@redhat.com> In-Reply-To: <20260116141859.719929-1-ming.lei@redhat.com> References: <20260116141859.719929-1-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 3.0 on 10.30.177.12 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 d1385f414bce..dfb5b1177cfd 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -263,6 +263,11 @@ static inline struct request *__ublk_check_and_get_req(struct ublk_device *ub, u16 q_id, u16 tag, struct ublk_io *io); 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) { @@ -2679,6 +2684,12 @@ 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) { @@ -2798,6 +2809,16 @@ 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]; @@ -2958,7 +2979,10 @@ 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