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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 2F244C433E0 for ; Fri, 24 Jul 2020 17:25:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F72420674 for ; Fri, 24 Jul 2020 17:25:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b="fW5eJ/mg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727108AbgGXRZ3 (ORCPT ); Fri, 24 Jul 2020 13:25:29 -0400 Received: from ale.deltatee.com ([204.191.154.188]:58566 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726326AbgGXRZ1 (ORCPT ); Fri, 24 Jul 2020 13:25:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=90mIqs/Rdt7ebnBY9w+aJugKi/FPdGKSj5lvcFCwxT4=; b=fW5eJ/mgZqfOmzmtqgMINjanWs aUSSem16BLiBaT3iXXkqXW42tIrokQTfVsoBE4AvsZ7nRYZTmNd3Ew/QhX+K3Mm4M9JCijb9baJYp yj3n4XrrS5mY1e25g+0UaNuynPozLISm6IIkrrye6uIq3yGZJbmTd/ZVaLVOeKzUmchC3Uk2i+LK6 kofA/QR8U6pYTYEnA2n91VU74AyGJxS7I92zooPXruTEh/jqq6MtP6jPCfACGze5DkYGshxkhwOnF JkNvHIqVz6g2qDhbNCGfV2JoFJln5UArItOY8xcY8mccE8vsXIu+LRrFmzkuMnKn25z7WYJ50iLDD mI16Ji1Q==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jz1Rk-0006yq-5m; Fri, 24 Jul 2020 11:25:26 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1jz1Ri-0004GF-AA; Fri, 24 Jul 2020 11:25:22 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org Cc: Christoph Hellwig , Sagi Grimberg , Keith Busch , Jens Axboe , Chaitanya Kulkarni , Max Gurtovoy , Stephen Bates , Logan Gunthorpe Date: Fri, 24 Jul 2020 11:25:15 -0600 Message-Id: <20200724172520.16318-5-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200724172520.16318-1-logang@deltatee.com> References: <20200724172520.16318-1-logang@deltatee.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, hch@lst.de, sagi@grimberg.me, kbusch@kernel.org, axboe@fb.com, Chaitanya.Kulkarni@wdc.com, maxg@mellanox.com, sbates@raithlin.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v16 4/9] nvme-core: Introduce nvme_ctrl_get_by_path() X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org nvme_ctrl_get_by_path() is analogous to blkdev_get_by_path() except it gets a struct nvme_ctrl from the path to its char dev (/dev/nvme0). It makes use of filp_open() to open the file and uses the private data to obtain a pointer to the struct nvme_ctrl. If the fops of the file do not match, -EINVAL is returned. The purpose of this function is to support NVMe-OF target passthru and is exported under the NVME_TARGET_PASSTHRU namespace. Signed-off-by: Logan Gunthorpe Reviewed-by: Max Gurtovoy Reviewed-by: Sagi Grimberg --- drivers/nvme/host/core.c | 23 +++++++++++++++++++++++ drivers/nvme/host/nvme.h | 1 + 2 files changed, 24 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index ccca36f881d6..35b1d13db2e9 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4575,6 +4575,29 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl) } EXPORT_SYMBOL_GPL(nvme_sync_queues); +struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path) +{ + struct nvme_ctrl *ctrl; + struct file *f; + + f = filp_open(path, O_RDWR, 0); + if (IS_ERR(f)) + return ERR_CAST(f); + + if (f->f_op != &nvme_dev_fops) { + ctrl = ERR_PTR(-EINVAL); + goto out_close; + } + + ctrl = f->private_data; + nvme_get_ctrl(ctrl); + +out_close: + filp_close(f, NULL); + return ctrl; +} +EXPORT_SYMBOL_NS_GPL(nvme_ctrl_get_by_path, NVME_TARGET_PASSTHRU); + /* * Check we didn't inadvertently grow the command structure sizes: */ diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index c43e0e4e0b97..4bec44ab5a96 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -787,5 +787,6 @@ static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { } u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode); void nvme_execute_passthru_rq(struct request *rq); +struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path); #endif /* _NVME_H */ -- 2.20.1