From patchwork Thu Jan 16 12:59:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinpu Wang X-Patchwork-Id: 11336799 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 CEF541820 for ; Thu, 16 Jan 2020 12:59:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ACAAF2087E for ; Thu, 16 Jan 2020 12:59:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Vg8xnilE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728925AbgAPM7u (ORCPT ); Thu, 16 Jan 2020 07:59:50 -0500 Received: from mail-ed1-f66.google.com ([209.85.208.66]:45577 "EHLO mail-ed1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728596AbgAPM7s (ORCPT ); Thu, 16 Jan 2020 07:59:48 -0500 Received: by mail-ed1-f66.google.com with SMTP id v28so18789250edw.12; Thu, 16 Jan 2020 04:59:47 -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=h38sH/BsaE0qxLOUlFU1pf6gJLw7I+0+tjv2Y6OQ32E=; b=Vg8xnilEBFVFenrZZXTNPv2fsHyqK+iOYLZwipjaxDYuO0kykSDgcTAkRGlc7nEHYw ktN1lIJsqunbvbrvo+v35WcI2+QJNr1+r0frbGOw0UAH+zS1jCpIJ7pJzcp/sVdya5AN nW9fuMXy5XlDaeeA1xbquuXoKhBJuBqFSVs/iXDztGupMy+IUPE1I8ExWlpf6s2G69sj ayc0EC0ESJfx2f1Qfp/Th2N9zvNVLhMXmWXJVMBI8t6sajANRsoV6gBckFAj7eF4yAiw +iATjV3V8ZUxni8/mB4IeNBmdJnysse9m0kcwkPfJEzq0ZYJittIfEsbY30QwU1mOfLM 0Zog== 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=h38sH/BsaE0qxLOUlFU1pf6gJLw7I+0+tjv2Y6OQ32E=; b=ZKrqATmeQ56vLyYZYvC1YXunwPC/r/Xcq9CwoRzuahLMCYqTsO2DccPDEA5R2nI866 OILbJwk2v/kgP5CdmSECXqEGx6yY24NE/x4zpmY5xbBjiORwYiF5P2FFxNpTHLUO/PkV SLuPMCbAnpfYQeMfJVHkMS+d69Jr4aG+pBuQv5FeLqvxQmWjYzXZeut6+h5cz0rJRvH1 wZNRnjt74P4jI+ve6V1Bw0vtZ+CwEYV/TZuCAi/NYWGEOUnefsYfMD0HKBvTtUQKNFr6 YlRFiaMFruXhYcm3ywPXOS5VAvhZfXkNN3NX0AtLjJ9mOG4z8C/zp8lcdPqHxLmkhezN DRdg== X-Gm-Message-State: APjAAAVVjvOrEfCJRc5+g8nYUGWOavIeByzAibL6848CcD0tSgIRJmDs xD09da9Iar1+2Oj2ss5bnjEgP66/ X-Google-Smtp-Source: APXvYqxRkdE/Tq0kS8NURvO5gBmpMeN/9hw4qrWWj115MSCJ8R+ZcwcF7VY7rkIhvvfhIc3uvyLDNA== X-Received: by 2002:aa7:c80b:: with SMTP id a11mr36188157edt.240.1579179586656; Thu, 16 Jan 2020 04:59:46 -0800 (PST) Received: from jwang-Latitude-5491.fritz.box ([2001:16b8:4956:1800:d464:b0ea:3ef4:abbb]) by smtp.gmail.com with ESMTPSA id b13sm697289ejl.5.2020.01.16.04.59.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jan 2020 04:59:46 -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 Subject: [PATCH v7 22/25] block/rnbd: server: sysfs interface functions Date: Thu, 16 Jan 2020 13:59:12 +0100 Message-Id: <20200116125915.14815-23-jinpuwang@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200116125915.14815-1-jinpuwang@gmail.com> References: <20200116125915.14815-1-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 is the sysfs interface to rnbd mapped devices on server side: /sys/devices/virtual/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 --- drivers/block/rnbd/rnbd-srv-sysfs.c | 213 ++++++++++++++++++++++++++++ 1 file changed, 213 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..b0b871b5105c --- /dev/null +++ b/drivers/block/rnbd/rnbd-srv-sysfs.c @@ -0,0 +1,213 @@ +// 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 struct kobj_type ktype = { + .sysfs_ops = &kobj_sysfs_ops, +}; + +int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev, + struct block_device *bdev, + const char *dir_name) +{ + struct kobject *bdev_kobj; + int ret; + + ret = kobject_init_and_add(&dev->dev_kobj, &ktype, + rnbd_devs_kobj, dir_name); + if (ret) + return ret; + + ret = kobject_init_and_add(&dev->dev_sessions_kobj, + &ktype, + &dev->dev_kobj, "sessions"); + if (ret) + goto err; + + bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj; + ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev"); + if (ret) + goto err2; + + return 0; + +err2: + kobject_put(&dev->dev_sessions_kobj); +err: + 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, "%s\n", + (sess_dev->open_flags & FMODE_WRITE) ? "0" : "1"); +} + +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) +{ + DECLARE_COMPLETION_ONSTACK(sysfs_compl); + + sysfs_remove_group(&sess_dev->kobj, + &rnbd_srv_default_dev_session_attr_group); + + sess_dev->sysfs_release_compl = &sysfs_compl; + kobject_del(&sess_dev->kobj); + kobject_put(&sess_dev->kobj); + wait_for_completion(&sysfs_compl); +} + +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); + if (sess_dev->sysfs_release_compl) + complete_all(sess_dev->sysfs_release_compl); +} + +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 (unlikely(!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); +}