From patchwork Mon Apr 27 14:10:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Danil Kipnis X-Patchwork-Id: 11512285 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 A8B8F14B4 for ; Mon, 27 Apr 2020 14:11:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91C46206CD for ; Mon, 27 Apr 2020 14:11:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=cloud.ionos.com header.i=@cloud.ionos.com header.b="BExPtTmv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727995AbgD0OLm (ORCPT ); Mon, 27 Apr 2020 10:11:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727990AbgD0OLm (ORCPT ); Mon, 27 Apr 2020 10:11:42 -0400 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF123C03C1A7 for ; Mon, 27 Apr 2020 07:11:40 -0700 (PDT) Received: by mail-wm1-x342.google.com with SMTP id x4so19711021wmj.1 for ; Mon, 27 Apr 2020 07:11:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.ionos.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=XkffJNStOBvRAiOGwO+3XR0/SnMIarXv0c30avQ1rKg=; b=BExPtTmvDKE2vJjFpK6nUJUxMhP9NEld3l8DJ0tTZFaN6uKyhtXC0mrluDzKSkBYIp 0xn2/yrni54XpppAModtf7uD0ryIPCvlFYUX30ZC7QTyi1WSQ3aaoId+j+7Q5AaNkrfJ WY2lPGZPEKCNoToTqy4T4RwT7SU2L0O1TgtDEoOegwQzr9WSKmFnpUY3mBWDxlK7IADB ng7PyQE8j5s0aoC12asfn6VwWCcsfJh9ESNsNkrjXmpxnT4rOO7pLbRFeQNRBaXm4KhQ g/hK7XGM92aRqAT5Rp6t4TD/0diNza0w5BR1FYOIF4xt8Maytb42nxAhkM/GsJC1lYvM 3Zug== 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:mime-version:content-transfer-encoding; bh=XkffJNStOBvRAiOGwO+3XR0/SnMIarXv0c30avQ1rKg=; b=udxZ6RevBPMez65CPR0/150EIW0In8VDM5Li/Ub3PLxh7QTsbsx8BUvoKeWeHB98Dz J3DWxeEGotV7zSC1PdoTZrZNjCZYwqz4xs/XZU4Gwo8g1j76sBkN7dxxt18gJvgoDTBR uwGfNnVP8ok84wFiOf1vOYwredHpRB6u1CE0emqSqmi2ydPhFbQdKgMflS0+6eM4Q9i3 nJ6UTCszbIkKiaWYIRNMTreGvHGja4sr7hS2gFBcQU4s4ooJbFXRP9rNu2msOd1gOZE7 qDjaWsV32FnaA4SQJ4EiQBvi/iuGIq3QZsvkXtiM0gau9DdOTgt5cS2MnEKLy8yqwPnu 4M1g== X-Gm-Message-State: AGi0Pua5xb3wPhppacn6UKcSQFRQunAGVenBpqKbdhfpa07pRFCw9qpR 5KxdBAhCmoT8jmhHvfhWrEXiz3Gnxv7f92k= X-Google-Smtp-Source: APiQypJj8RyyricEoxmjzeEAw45GVhWrcysbS8gtKTLjtaQqdThAVXIL0IcoXl0RmUF3JaSCWd04Ug== X-Received: by 2002:a1c:4e15:: with SMTP id g21mr25780035wmh.29.1587996699337; Mon, 27 Apr 2020 07:11:39 -0700 (PDT) Received: from dkxps.fkb.profitbricks.net (dslb-002-204-227-207.002.204.pools.vodafone-ip.de. [2.204.227.207]) by smtp.gmail.com with ESMTPSA id o3sm21499756wru.68.2020.04.27.07.11.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Apr 2020 07:11:38 -0700 (PDT) From: Danil Kipnis 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, pankaj.gupta@cloud.ionos.com Subject: [PATCH v13 22/25] block/rnbd: server: sysfs interface functions Date: Mon, 27 Apr 2020 16:10:17 +0200 Message-Id: <20200427141020.655-23-danil.kipnis@cloud.ionos.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200427141020.655-1-danil.kipnis@cloud.ionos.com> References: <20200427141020.655-1-danil.kipnis@cloud.ionos.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Jack Wang This is the sysfs interface to rnbd mapped devices on server side: /sys/class/rnbd-server/ctl/devices// |- block_dev | *** link pointing to the corresponding block device sysfs entry | |- sessions// | *** sessions directory | |- read_only | *** is devices mapped as read only | |- mapping_path *** relative device path provided by the client during mapping Signed-off-by: Danil Kipnis Signed-off-by: Jack Wang Reviewed-by: Bart Van Assche --- drivers/block/rnbd/rnbd-srv-sysfs.c | 215 ++++++++++++++++++++++++++++ 1 file changed, 215 insertions(+) create mode 100644 drivers/block/rnbd/rnbd-srv-sysfs.c diff --git a/drivers/block/rnbd/rnbd-srv-sysfs.c b/drivers/block/rnbd/rnbd-srv-sysfs.c new file mode 100644 index 000000000000..106775c074d1 --- /dev/null +++ b/drivers/block/rnbd/rnbd-srv-sysfs.c @@ -0,0 +1,215 @@ +// 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 +#include +#include +#include +#include +#include +#include +#include + +#include "rnbd-srv.h" + +static struct device *rnbd_dev; +static struct class *rnbd_dev_class; +static struct kobject *rnbd_devs_kobj; + +static void rnbd_srv_dev_release(struct kobject *kobj) +{ + struct rnbd_srv_dev *dev; + + dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj); + + kfree(dev); +} + +static struct kobj_type dev_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = rnbd_srv_dev_release +}; + +int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev, + struct block_device *bdev, + const char *dev_name) +{ + struct kobject *bdev_kobj; + int ret; + + ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype, + rnbd_devs_kobj, dev_name); + if (ret) + return ret; + + dev->dev_sessions_kobj = kobject_create_and_add("sessions", + &dev->dev_kobj); + if (!dev->dev_sessions_kobj) + goto put_dev_kobj; + + bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj; + ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev"); + if (ret) + goto put_sess_kobj; + + return 0; + +put_sess_kobj: + kobject_put(dev->dev_sessions_kobj); +put_dev_kobj: + kobject_put(&dev->dev_kobj); + return ret; +} + +void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev) +{ + sysfs_remove_link(&dev->dev_kobj, "block_dev"); + kobject_del(dev->dev_sessions_kobj); + kobject_put(dev->dev_sessions_kobj); + kobject_del(&dev->dev_kobj); + kobject_put(&dev->dev_kobj); +} + +static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr, + char *page) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%d\n", + !(sess_dev->open_flags & FMODE_WRITE)); +} + +static struct kobj_attribute rnbd_srv_dev_session_ro_attr = + __ATTR_RO(read_only); + +static ssize_t access_mode_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *page) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%s\n", + rnbd_access_mode_str(sess_dev->access_mode)); +} + +static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr = + __ATTR_RO(access_mode); + +static ssize_t mapping_path_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%s\n", sess_dev->pathname); +} + +static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr = + __ATTR_RO(mapping_path); + +static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = { + &rnbd_srv_dev_session_access_mode_attr.attr, + &rnbd_srv_dev_session_ro_attr.attr, + &rnbd_srv_dev_session_mapping_path_attr.attr, + NULL, +}; + +static struct attribute_group rnbd_srv_default_dev_session_attr_group = { + .attrs = rnbd_srv_default_dev_sessions_attrs, +}; + +void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev) +{ + sysfs_remove_group(&sess_dev->kobj, + &rnbd_srv_default_dev_session_attr_group); + + kobject_del(&sess_dev->kobj); + kobject_put(&sess_dev->kobj); +} + +static void rnbd_srv_sess_dev_release(struct kobject *kobj) +{ + struct rnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); + rnbd_destroy_sess_dev(sess_dev); +} + +static struct kobj_type rnbd_srv_sess_dev_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = rnbd_srv_sess_dev_release, +}; + +int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev) +{ + int ret; + + ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype, + sess_dev->dev->dev_sessions_kobj, "%s", + sess_dev->sess->sessname); + if (ret) + return ret; + + ret = sysfs_create_group(&sess_dev->kobj, + &rnbd_srv_default_dev_session_attr_group); + if (ret) + goto err; + + return 0; + +err: + kobject_put(&sess_dev->kobj); + + return ret; +} + +int rnbd_srv_create_sysfs_files(void) +{ + int err; + + rnbd_dev_class = class_create(THIS_MODULE, "rnbd-server"); + if (IS_ERR(rnbd_dev_class)) + return PTR_ERR(rnbd_dev_class); + + rnbd_dev = device_create(rnbd_dev_class, NULL, + MKDEV(0, 0), NULL, "ctl"); + if (IS_ERR(rnbd_dev)) { + err = PTR_ERR(rnbd_dev); + goto cls_destroy; + } + rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj); + if (!rnbd_devs_kobj) { + err = -ENOMEM; + goto dev_destroy; + } + + return 0; + +dev_destroy: + device_destroy(rnbd_dev_class, MKDEV(0, 0)); +cls_destroy: + class_destroy(rnbd_dev_class); + + return err; +} + +void rnbd_srv_destroy_sysfs_files(void) +{ + kobject_del(rnbd_devs_kobj); + kobject_put(rnbd_devs_kobj); + device_destroy(rnbd_dev_class, MKDEV(0, 0)); + class_destroy(rnbd_dev_class); +}