From patchwork Fri Dec 20 15:51:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinpu Wang X-Patchwork-Id: 11305925 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 35D871892 for ; Fri, 20 Dec 2019 15:51:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C3AB2467F for ; Fri, 20 Dec 2019 15:51:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="b99VlYfv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727607AbfLTPvp (ORCPT ); Fri, 20 Dec 2019 10:51:45 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:45784 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727508AbfLTPvp (ORCPT ); Fri, 20 Dec 2019 10:51:45 -0500 Received: by mail-wr1-f68.google.com with SMTP id j42so9835924wrj.12; Fri, 20 Dec 2019 07:51:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=zhHusrUtCQBKQmN9sEDR9yNkJcrwcrrgHlWgb9v6lZg=; b=b99VlYfvK61OADNq5Cu437tJ7dLfTpMdaUJvnPojmyPTRJG2H6JdYe/n1fmapT3aZ3 Maksmwo7MGxFK0hhOvWti/B84p0WhIeFZS3ayM81s0sP+2qeRxAT8GcwDltNfjrSGQ2C ztqxM/xjMrh5e6liET3b+cnfzdMK/W06Lp3MJebejGECBfZqZZPU/srIWWqBdMc6pvgl b5EYG1ZM9ii+peDqo9tJbYsCnsIxMmkEJjAPhCvgkB94lBjXxHnUObMnbCdVNbWEDhRW 1EktLog4+FlFnE9gqNgmQcMrYFBOOduwfXHLvyW4HezLoa7bINkB93/LQ4x7p+om0/tI Z+FA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=zhHusrUtCQBKQmN9sEDR9yNkJcrwcrrgHlWgb9v6lZg=; b=tnrsRxZGXOMG1eNWXyh6SI5EaHNzfKCF0sa76wLBWG4+t/6O+kE2a/rzEnG5yIG2Lt Shp543qktwCEBILoGixqqHJAvB1G9mnWrqkUJ4fyAonwnwAi6QUIF7VN5G1ksFuyq6SY BKa6MibyjrsJicrGejWYKsKl3IddPd8n7pzgwMJiUAY3uKvI+p0eDjie0CGmfp4KmKPw s9+K+cfm32KKQvHRxByCsFG/Ln2VELs0Z8BGgC73q4E63zTBv4jGA1/3wkX3EnF3aujW vNw6Dn+M5ykv6S3saQSPKiGb+CIvj63mqCaff7QB6l4jzUDXHCd2MbalxlTvmDeLEGWk mLow== X-Gm-Message-State: APjAAAVvPk8WAGkPAgZfBhxD2F5foodigwqmTx3csE3J6iolC0MdniRg Ahc0dHBhJ8Yj/Cz0yQ2w1uGiCnSv X-Google-Smtp-Source: APXvYqzs1E6tNJrQQtDZio9C2YfVJm/WKmlC+M+RPZ8KDpVSoTY3CK0uZ7VU1OC4Gn/4jRD7RT9o7w== X-Received: by 2002:adf:ef0b:: with SMTP id e11mr154843wro.128.1576857101157; Fri, 20 Dec 2019 07:51:41 -0800 (PST) Received: from jwang-Latitude-5491.fritz.box ([2001:16b8:4972:cc00:b9e0:6ef7:286d:4897]) by smtp.gmail.com with ESMTPSA id u14sm10372139wrm.51.2019.12.20.07.51.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Dec 2019 07:51:40 -0800 (PST) From: Jack Wang To: linux-block@vger.kernel.org, linux-rdma@vger.kernel.org Cc: axboe@kernel.dk, hch@infradead.org, sagi@grimberg.me, bvanassche@acm.org, leon@kernel.org, dledford@redhat.com, danil.kipnis@cloud.ionos.com, jinpu.wang@cloud.ionos.com, rpenyaev@suse.de Subject: [PATCH v5 21/25] rnbd: server: functionality for IO submission to file or block dev Date: Fri, 20 Dec 2019 16:51:05 +0100 Message-Id: <20191220155109.8959-22-jinpuwang@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191220155109.8959-1-jinpuwang@gmail.com> References: <20191220155109.8959-1-jinpuwang@gmail.com> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Jack Wang This provides helper functions for IO submission to file or block dev. Signed-off-by: Danil Kipnis Signed-off-by: Jack Wang --- drivers/block/rnbd/rnbd-srv-dev.c | 162 ++++++++++++++++++++++++++++++ drivers/block/rnbd/rnbd-srv-dev.h | 130 ++++++++++++++++++++++++ 2 files changed, 292 insertions(+) create mode 100644 drivers/block/rnbd/rnbd-srv-dev.c create mode 100644 drivers/block/rnbd/rnbd-srv-dev.h diff --git a/drivers/block/rnbd/rnbd-srv-dev.c b/drivers/block/rnbd/rnbd-srv-dev.c new file mode 100644 index 000000000000..1f876d7fa685 --- /dev/null +++ b/drivers/block/rnbd/rnbd-srv-dev.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * InfiniBand Network Block Driver + * + * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved. + * Authors: Fabian Holler + * Jack Wang + * Kleber Souza + * Danil Kipnis + * Roman Penyaev + * Milind Dumbare + * + * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved. + * Authors: Danil Kipnis + * Roman Penyaev + * + * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. + * Authors: Roman Penyaev + * Jack Wang + * Danil Kipnis + */ + +/* Copyright (c) 2019 1&1 IONOS SE. All rights reserved. + * Authors: Jack Wang + * Danil Kipnis + * Guoqing Jiang + * Lutz Pogrell + */ +#undef pr_fmt +#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt + +#include "rnbd-srv-dev.h" +#include "rnbd-log.h" + +struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags, + struct bio_set *bs, rnbd_dev_io_fn io_cb) +{ + struct rnbd_dev *dev; + int ret; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return ERR_PTR(-ENOMEM); + + dev->blk_open_flags = flags; + dev->bdev = blkdev_get_by_path(path, flags, THIS_MODULE); + ret = PTR_ERR_OR_ZERO(dev->bdev); + if (ret) + goto err; + + dev->blk_open_flags = flags; + dev->io_cb = io_cb; + bdevname(dev->bdev, dev->name); + dev->ibd_bio_set = bs; + + return dev; + +err: + kfree(dev); + return ERR_PTR(ret); +} + +void rnbd_dev_close(struct rnbd_dev *dev) +{ + blkdev_put(dev->bdev, dev->blk_open_flags); + kfree(dev); +} + +static void rnbd_dev_bi_end_io(struct bio *bio) +{ + struct rnbd_dev_blk_io *io = bio->bi_private; + + io->dev->io_cb(io->priv, blk_status_to_errno(bio->bi_status)); + bio_put(bio); +} + +/** + * rnbd_bio_map_kern - map kernel address into bio + * @q: the struct request_queue for the bio + * @data: pointer to buffer to map + * @bs: bio_set to use. + * @len: length in bytes + * @gfp_mask: allocation flags for bio allocation + * + * Map the kernel address into a bio suitable for io to a block + * device. Returns an error pointer in case of error. + */ +static struct bio *rnbd_bio_map_kern(struct request_queue *q, void *data, + struct bio_set *bs, + unsigned int len, gfp_t gfp_mask) +{ + unsigned long kaddr = (unsigned long)data; + unsigned long end = (kaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT; + unsigned long start = kaddr >> PAGE_SHIFT; + const int nr_pages = end - start; + int offset, i; + struct bio *bio; + + bio = bio_alloc_bioset(gfp_mask, nr_pages, bs); + if (!bio) + return ERR_PTR(-ENOMEM); + + offset = offset_in_page(kaddr); + for (i = 0; i < nr_pages; i++) { + unsigned int bytes = PAGE_SIZE - offset; + + if (len <= 0) + break; + + if (bytes > len) + bytes = len; + + if (bio_add_pc_page(q, bio, virt_to_page(data), bytes, + offset) < bytes) { + /* we don't support partial mappings */ + bio_put(bio); + return ERR_PTR(-EINVAL); + } + + data += bytes; + len -= bytes; + offset = 0; + } + + bio->bi_end_io = bio_put; + return bio; +} + +int rnbd_dev_submit_io(struct rnbd_dev *dev, sector_t sector, void *data, + size_t len, u32 bi_size, enum rnbd_io_flags flags, + short prio, void *priv) +{ + struct request_queue *q = bdev_get_queue(dev->bdev); + struct rnbd_dev_blk_io *io; + struct bio *bio; + + /* check if the buffer is suitable for bdev */ + if (WARN_ON(!blk_rq_aligned(q, (unsigned long)data, len))) + return -EINVAL; + + /* Generate bio with pages pointing to the rdma buffer */ + bio = rnbd_bio_map_kern(q, data, dev->ibd_bio_set, len, GFP_KERNEL); + if (IS_ERR(bio)) + return PTR_ERR(bio); + + io = container_of(bio, struct rnbd_dev_blk_io, bio); + + io->dev = dev; + io->priv = priv; + + bio->bi_end_io = rnbd_dev_bi_end_io; + bio->bi_private = io; + bio->bi_opf = rnbd_to_bio_flags(flags); + bio->bi_iter.bi_sector = sector; + bio->bi_iter.bi_size = bi_size; + bio_set_prio(bio, prio); + bio_set_dev(bio, dev->bdev); + + submit_bio(bio); + + return 0; +} diff --git a/drivers/block/rnbd/rnbd-srv-dev.h b/drivers/block/rnbd/rnbd-srv-dev.h new file mode 100644 index 000000000000..724a2a650e2d --- /dev/null +++ b/drivers/block/rnbd/rnbd-srv-dev.h @@ -0,0 +1,130 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * InfiniBand Network Block Driver + * + * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved. + * Authors: Fabian Holler + * Jack Wang + * Kleber Souza + * Danil Kipnis + * Roman Penyaev + * Milind Dumbare + * + * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved. + * Authors: Danil Kipnis + * Roman Penyaev + * + * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. + * Authors: Roman Penyaev + * Jack Wang + * Danil Kipnis + */ + +/* Copyright (c) 2019 1&1 IONOS SE. All rights reserved. + * Authors: Jack Wang + * Danil Kipnis + * Guoqing Jiang + * Lutz Pogrell + */ +#ifndef RNBD_SRV_DEV_H +#define RNBD_SRV_DEV_H + +#include +#include "rnbd-proto.h" + +typedef void rnbd_dev_io_fn(void *priv, int error); + +struct rnbd_dev { + struct block_device *bdev; + struct bio_set *ibd_bio_set; + fmode_t blk_open_flags; + char name[BDEVNAME_SIZE]; + rnbd_dev_io_fn *io_cb; +}; + +struct rnbd_dev_blk_io { + struct rnbd_dev *dev; + void *priv; + /* have to be last member for front_pad usage of bioset_init */ + struct bio bio; +}; + +/** + * rnbd_dev_open() - Open a device + * @flags: open flags + * @bs: bio_set to use during block io, + * @io_cb: is called when I/O finished + */ +struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags, + struct bio_set *bs, rnbd_dev_io_fn io_cb); + +/** + * rnbd_dev_close() - Close a device + */ +void rnbd_dev_close(struct rnbd_dev *dev); + +static inline int rnbd_dev_get_logical_bsize(const struct rnbd_dev *dev) +{ + return bdev_logical_block_size(dev->bdev); +} + +static inline int rnbd_dev_get_phys_bsize(const struct rnbd_dev *dev) +{ + return bdev_physical_block_size(dev->bdev); +} + +static inline int rnbd_dev_get_max_segs(const struct rnbd_dev *dev) +{ + return queue_max_segments(bdev_get_queue(dev->bdev)); +} + +static inline int rnbd_dev_get_max_hw_sects(const struct rnbd_dev *dev) +{ + return queue_max_hw_sectors(bdev_get_queue(dev->bdev)); +} + +static inline int +rnbd_dev_get_max_write_same_sects(const struct rnbd_dev *dev) +{ + return bdev_write_same(dev->bdev); +} + +static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev) +{ + return blk_queue_secure_erase(bdev_get_queue(dev->bdev)); +} + +static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev) +{ + if (!blk_queue_discard(bdev_get_queue(dev->bdev))) + return 0; + + return blk_queue_get_max_sectors(bdev_get_queue(dev->bdev), + REQ_OP_DISCARD); +} + +static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev) +{ + return bdev_get_queue(dev->bdev)->limits.discard_granularity; +} + +static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev) +{ + return bdev_get_queue(dev->bdev)->limits.discard_alignment; +} + +/** + * rnbd_dev_submit_io() - Submit an I/O to the disk + * @dev: device to that the I/O is submitted + * @sector: address to read/write data to + * @data: I/O data to write or buffer to read I/O date into + * @len: length of @data + * @bi_size: Amount of data that will be read/written + * @prio: IO priority + * @priv: private data passed to @io_fn + */ +int rnbd_dev_submit_io(struct rnbd_dev *dev, sector_t sector, void *data, + size_t len, u32 bi_size, enum rnbd_io_flags flags, + short prio, void *priv); + +#endif /* RNBD_SRV_DEV_H */