From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C5B3AC35663 for ; Fri, 21 Feb 2020 10:47:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8D32F24653 for ; Fri, 21 Feb 2020 10:47:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="dafBZLTU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728313AbgBUKrs (ORCPT ); Fri, 21 Feb 2020 05:47:48 -0500 Received: from mail-ed1-f68.google.com ([209.85.208.68]:36166 "EHLO mail-ed1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728280AbgBUKrr (ORCPT ); Fri, 21 Feb 2020 05:47:47 -0500 Received: by mail-ed1-f68.google.com with SMTP id j17so1800123edp.3; Fri, 21 Feb 2020 02:47:46 -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=5LqOAK11viWDiZ73xXxl+8g89M5P1oyPwSH9BZ/09No=; b=dafBZLTUyMJltF0IZE/xhsnusUwLWE3hmMO/FAzpfFfph4R0vhny3zX/mp97JwzPGM UyofRMiwNPGbk9hRpFNy5Qds/YYgsy2EgKzL23h5p6Yizfrj20b5JXVb/qi8v4UfGOeI EqkLFInHo7R9XdP9OMSHfOTyKRXYp6OkauHLux04l0ybjSCxI266ZI6r71kgo1hRFal0 YVYzjiFJ8GbmE5O+bAGKsdBLc9CGB+AUyyOx2Eq5/4uWpSKEUwTn/YCFvz/HakAwnCOi pRv8Annb1xpJpbdHT5Uj7umt8f+49KfXqWOOGgWhLqvDzZw13WVOThNlIZ5bBMvU0TYi pkSA== 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=5LqOAK11viWDiZ73xXxl+8g89M5P1oyPwSH9BZ/09No=; b=iY+xKjGKiwXqELWQuhShOEsMHDVIkMP+caiK7sLQtXnD3NmaqGxq4cQgK/l5HZ+C+C R4EJkdMHxFVPgMQgbv66MpF8t4V37N4dNOYAS527g5GFSwHS2TXiFf//hfn1k3lzcu6V XZbYYM88b/Z/WqDcxraRsIcDkmpwvUSLZyvjRSSFT77RwLXzLNvnof+r7mv323YOZH/L AGCk5X0el6aNq162G/NjOhYE8+GIgtK7BPWs15t+/xnS5FI0twZyjx8N4fjUKgAKEd28 I5VuOLqB3DH0AsrGBsymg4p7xOES+0MsDhKckrB9kteU2+Lwf3OPK3ioVRDBB13BuAC2 6x1g== X-Gm-Message-State: APjAAAUMlxcADv9oaHCZZ353squeDYqPgml1c9jKkGpBG2T+iKee1mwu wZrfYmlj+oiG5X4sLFYIlufqPYL4 X-Google-Smtp-Source: APXvYqwtyoYzqoTEAOAllVi1VBbH8ViUTw1btXA777+hDq77yo2cjNyjhwvxVI8yq0e8UFzhUu9ORw== X-Received: by 2002:a17:906:8306:: with SMTP id j6mr33355819ejx.105.1582282065677; Fri, 21 Feb 2020 02:47:45 -0800 (PST) Received: from jwang-Latitude-5491.pb.local ([2001:1438:4010:2558:d8ec:cf8e:d7de:fb22]) by smtp.gmail.com with ESMTPSA id 2sm270594edv.87.2020.02.21.02.47.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Feb 2020 02:47:45 -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, jgg@ziepe.ca, danil.kipnis@cloud.ionos.com, jinpu.wang@cloud.ionos.com, rpenyaev@suse.de, pankaj.gupta@cloud.ionos.com Subject: [PATCH v9 21/25] block/rnbd: server: functionality for IO submission to file or block dev Date: Fri, 21 Feb 2020 11:47:17 +0100 Message-Id: <20200221104721.350-22-jinpuwang@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200221104721.350-1-jinpuwang@gmail.com> References: <20200221104721.350-1-jinpuwang@gmail.com> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@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 | 142 ++++++++++++++++++++++++++++++ drivers/block/rnbd/rnbd-srv-dev.h | 110 +++++++++++++++++++++++ 2 files changed, 252 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..ef8d35411b6d --- /dev/null +++ b/drivers/block/rnbd/rnbd-srv-dev.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * RDMA Network Block Driver + * + * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. + * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. + * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. + */ +#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..4bd28aadb86f --- /dev/null +++ b/drivers/block/rnbd/rnbd-srv-dev.h @@ -0,0 +1,110 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * RDMA Network Block Driver + * + * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. + * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. + * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. + */ +#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 */ -- 2.17.1