From patchwork Fri Feb 2 14:09:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roman Pen X-Patchwork-Id: 10196871 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E7D1C6037D for ; Fri, 2 Feb 2018 14:11:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D736D28E61 for ; Fri, 2 Feb 2018 14:11:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CC05428E68; Fri, 2 Feb 2018 14:11:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3834228E61 for ; Fri, 2 Feb 2018 14:11:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752021AbeBBOLg (ORCPT ); Fri, 2 Feb 2018 09:11:36 -0500 Received: from mail-wm0-f66.google.com ([74.125.82.66]:55203 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752133AbeBBOLI (ORCPT ); Fri, 2 Feb 2018 09:11:08 -0500 Received: by mail-wm0-f66.google.com with SMTP id i186so12856337wmi.4 for ; Fri, 02 Feb 2018 06:11:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=profitbricks-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=yXnMGspv6swT5FHoY8cPrX3914hhXE5ihY/U6fNCBD0=; b=Oj9aPvctT4xiIgxWPPvZu5gxljHTpvvXBpSv8f7bEPxMoFYNs6Y7jOfyDgSagBjpcM icZ073YC3zHNvyiYGz5ZnKI4xH8T23DYNtZw/DyGWCRlXujGblTGOEqitZAkQtpFCWDM FJwkeUOhv2r4hZIjOPCVkb5ofb/uexwo2mqqFRLV+AbKGkIxnrXiSDuZLLH1zzusy+DF eC6pfSggWgvUhnMwU6VV8E0z5yA2GVcYR7BTxSnMlboZd6eknH+YOvwkjwz8hlxr3Kvh 3AeBtNytgybbGH3HqOIpzJ1dpCXzmOu41niK+bFIlPBOo2wcAvQj3MvzuHb4Q8ipl9HP LyFA== 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=yXnMGspv6swT5FHoY8cPrX3914hhXE5ihY/U6fNCBD0=; b=nDEMj2P0C7ibqIEx4Vgb095sBCDk98B0bCkcUOFsDkSc/gYXq2P3R2xNlfY+smqtUk QF+kypFH0kNS16e3lneEoLt87wKAaplcpFa/rqTgmQUFLZLY7cHWwSgXpMwd53+CkILZ P9Ib6Q7YIoebyPMNzUJ8lfVF1iEWBnLbutB4xpObimda7hyRdGKAA4opHRvMFEqitLfs 2G/NwdiPL5F4Ek6ZKDmEhIEQqEqmcypEZzzdRTXOgpBbA2V/iE91wqGdypmJ0H/oijSx 2nLFrWVuh6FdP6EcqAV345vaazPHGId4MFiXUsKVBLOavTeuMhwQqmG1PQ75avyE0pcE HnrA== X-Gm-Message-State: AKwxyteniSYz3d4TkoL/7C+4r+mK+m4+6yjqyOr+TGRNjw28J2wWR+KI 4/+jsA4m1G5j87I86E5heX/JLimX X-Google-Smtp-Source: AH8x227zTzLJQzWSJB00ITzdPLVR0IQHXUFc8IxSxAB+68PwnKF6z89N0iN3EKcwJSI5Ql+BtfjJgA== X-Received: by 10.28.4.206 with SMTP id 197mr27489238wme.42.1517580666757; Fri, 02 Feb 2018 06:11:06 -0800 (PST) Received: from pb.pb.local ([62.217.45.26]) by smtp.gmail.com with ESMTPSA id v186sm798819wmf.17.2018.02.02.06.11.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 02 Feb 2018 06:11:06 -0800 (PST) From: Roman Pen To: linux-block@vger.kernel.org, linux-rdma@vger.kernel.org Cc: Jens Axboe , Christoph Hellwig , Sagi Grimberg , Bart Van Assche , Or Gerlitz , Roman Pen , Danil Kipnis , Jack Wang Subject: [PATCH 21/24] ibnbd: server: sysfs interface functions Date: Fri, 2 Feb 2018 15:09:01 +0100 Message-Id: <20180202140904.2017-22-roman.penyaev@profitbricks.com> X-Mailer: git-send-email 2.13.1 In-Reply-To: <20180202140904.2017-1-roman.penyaev@profitbricks.com> References: <20180202140904.2017-1-roman.penyaev@profitbricks.com> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is the sysfs interface to IBNBD mapped devices on server side: /sys/kernel/ibnbd_server/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: Roman Pen Signed-off-by: Danil Kipnis Cc: Jack Wang --- drivers/block/ibnbd/ibnbd-srv-sysfs.c | 264 ++++++++++++++++++++++++++++++++++ 1 file changed, 264 insertions(+) diff --git a/drivers/block/ibnbd/ibnbd-srv-sysfs.c b/drivers/block/ibnbd/ibnbd-srv-sysfs.c new file mode 100644 index 000000000000..a0efd6a2accb --- /dev/null +++ b/drivers/block/ibnbd/ibnbd-srv-sysfs.c @@ -0,0 +1,264 @@ +/* + * 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 + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + */ + +#undef pr_fmt +#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt + +#include +#include +#include +#include +#include +#include +#include + +#include "ibnbd-srv.h" + +static struct kobject *ibnbd_srv_kobj; +static struct kobject *ibnbd_srv_devices_kobj; + +static struct attribute *ibnbd_srv_default_dev_attrs[] = { + NULL, +}; + +static struct attribute_group ibnbd_srv_default_dev_attr_group = { + .attrs = ibnbd_srv_default_dev_attrs, +}; + +static ssize_t ibnbd_srv_attr_show(struct kobject *kobj, struct attribute *attr, + char *page) +{ + struct kobj_attribute *kattr; + int ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->show) + ret = kattr->show(kobj, kattr, page); + return ret; +} + +static ssize_t ibnbd_srv_attr_store(struct kobject *kobj, + struct attribute *attr, + const char *page, size_t length) +{ + struct kobj_attribute *kattr; + int ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->store) + ret = kattr->store(kobj, kattr, page, length); + return ret; +} + +static const struct sysfs_ops ibnbd_srv_sysfs_ops = { + .show = ibnbd_srv_attr_show, + .store = ibnbd_srv_attr_store, +}; + +static struct kobj_type ibnbd_srv_dev_ktype = { + .sysfs_ops = &ibnbd_srv_sysfs_ops, +}; + +static struct kobj_type ibnbd_srv_dev_sessions_ktype = { + .sysfs_ops = &ibnbd_srv_sysfs_ops, +}; + +int ibnbd_srv_create_dev_sysfs(struct ibnbd_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, &ibnbd_srv_dev_ktype, + ibnbd_srv_devices_kobj, dir_name); + if (ret) + return ret; + + ret = kobject_init_and_add(&dev->dev_sessions_kobj, + &ibnbd_srv_dev_sessions_ktype, + &dev->dev_kobj, "sessions"); + if (ret) + goto err; + + ret = sysfs_create_group(&dev->dev_kobj, + &ibnbd_srv_default_dev_attr_group); + if (ret) + goto err2; + + bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj; + ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev"); + if (ret) + goto err3; + + return 0; + +err3: + sysfs_remove_group(&dev->dev_kobj, + &ibnbd_srv_default_dev_attr_group); +err2: + kobject_del(&dev->dev_sessions_kobj); + kobject_put(&dev->dev_sessions_kobj); +err: + kobject_del(&dev->dev_kobj); + kobject_put(&dev->dev_kobj); + return ret; +} + +void ibnbd_srv_destroy_dev_sysfs(struct ibnbd_srv_dev *dev) +{ + sysfs_remove_link(&dev->dev_kobj, "block_dev"); + sysfs_remove_group(&dev->dev_kobj, &ibnbd_srv_default_dev_attr_group); + 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 ibnbd_srv_dev_session_ro_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *page) +{ + struct ibnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct ibnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%s\n", + (sess_dev->open_flags & FMODE_WRITE) ? "0" : "1"); +} + +static struct kobj_attribute ibnbd_srv_dev_session_ro_attr = + __ATTR(read_only, 0444, + ibnbd_srv_dev_session_ro_show, + NULL); + +static ssize_t +ibnbd_srv_dev_session_mapping_path_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + struct ibnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct ibnbd_srv_sess_dev, kobj); + + return scnprintf(page, PAGE_SIZE, "%s\n", sess_dev->pathname); +} + +static struct kobj_attribute ibnbd_srv_dev_session_mapping_path_attr = + __ATTR(mapping_path, 0444, + ibnbd_srv_dev_session_mapping_path_show, + NULL); + +static struct attribute *ibnbd_srv_default_dev_sessions_attrs[] = { + &ibnbd_srv_dev_session_ro_attr.attr, + &ibnbd_srv_dev_session_mapping_path_attr.attr, + NULL, +}; + +static struct attribute_group ibnbd_srv_default_dev_session_attr_group = { + .attrs = ibnbd_srv_default_dev_sessions_attrs, +}; + +void ibnbd_srv_destroy_dev_session_sysfs(struct ibnbd_srv_sess_dev *sess_dev) +{ + DECLARE_COMPLETION_ONSTACK(sysfs_compl); + + sysfs_remove_group(&sess_dev->kobj, + &ibnbd_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 ibnbd_srv_sess_dev_release(struct kobject *kobj) +{ + struct ibnbd_srv_sess_dev *sess_dev; + + sess_dev = container_of(kobj, struct ibnbd_srv_sess_dev, kobj); + if (sess_dev->sysfs_release_compl) + complete_all(sess_dev->sysfs_release_compl); +} + +static struct kobj_type ibnbd_srv_sess_dev_ktype = { + .sysfs_ops = &ibnbd_srv_sysfs_ops, + .release = ibnbd_srv_sess_dev_release, +}; + +int ibnbd_srv_create_dev_session_sysfs(struct ibnbd_srv_sess_dev *sess_dev) +{ + int ret; + + ret = kobject_init_and_add(&sess_dev->kobj, &ibnbd_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, + &ibnbd_srv_default_dev_session_attr_group); + if (ret) + goto err; + + return 0; + +err: + kobject_del(&sess_dev->kobj); + kobject_put(&sess_dev->kobj); + + return ret; +} + +int ibnbd_srv_create_sysfs_files(void) +{ + int err; + + ibnbd_srv_kobj = kobject_create_and_add(KBUILD_MODNAME, kernel_kobj); + if (!ibnbd_srv_kobj) + return -ENOMEM; + + ibnbd_srv_devices_kobj = kobject_create_and_add("devices", + ibnbd_srv_kobj); + if (!ibnbd_srv_devices_kobj) { + err = -ENOMEM; + goto err; + } + + return 0; + +err: + kobject_put(ibnbd_srv_kobj); + return err; +} + +void ibnbd_srv_destroy_sysfs_files(void) +{ + kobject_put(ibnbd_srv_devices_kobj); + kobject_put(ibnbd_srv_kobj); +}