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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 78762C43603 for ; Thu, 12 Dec 2019 23:54:50 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 43B242054F for ; Thu, 12 Dec 2019 23:54:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="UoP1HlUg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 43B242054F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=deltatee.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Subject:MIME-Version:References: In-Reply-To:Message-Id:Date:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=6RqDYKSpfmMXcVA34Mj7L6PV42kexHPNsPi9hmJ06cU=; b=UoP1HlUgHeTGpE 7rWGQSVjO2AXvbQxmqAXtpMel26+C5n6pevPky+Y4mYbv0oh0/2BBZyaBvVOn8Qh6bJYBvxmXqm1S M/aNghQOogfPo5cLKaopxD5+U/f/Ctq87SvO4sclpvziigKKMROhz1jVbnYy7MY9swAX3eZVquMsU DFKqllUuX/OQUZJG7uSVMReOG59ONEDi+gQTCXvYjJWoergPoPiTFN0Z4+NY7jX5bcw+TtW4CIbDJ BfKJpmCwrvwWWANTXpril6yT6fvP+YqFy+8lXLEoqIz04XY4dN/4lpu55NHme6sJBmzvAxtILsFqN R275rZ2DncOLTgZHvavA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ifYI8-0003jt-34; Thu, 12 Dec 2019 23:54:44 +0000 Received: from ale.deltatee.com ([207.54.116.67]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ifYHz-0003dD-O4 for linux-nvme@lists.infradead.org; Thu, 12 Dec 2019 23:54:37 +0000 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 1ifYHt-0004ZI-IL; Thu, 12 Dec 2019 16:54:31 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1ifYHn-0005qK-Q4; Thu, 12 Dec 2019 16:54:23 -0700 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org Date: Thu, 12 Dec 2019 16:54:14 -0700 Message-Id: <20191212235418.22396-6-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191212235418.22396-1-logang@deltatee.com> References: <20191212235418.22396-1-logang@deltatee.com> MIME-Version: 1.0 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 v10 5/9] 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) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191212_155435_781487_52E26E96 X-CRM114-Status: GOOD ( 12.63 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sagi Grimberg , Chaitanya Kulkarni , Stephen Bates , Jens Axboe , Keith Busch , Max Gurtovoy , Logan Gunthorpe , Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org nvme_ctrl_get_by_path() is analagous 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. Signed-off-by: Logan Gunthorpe Reviewed-by: Max Gurtovoy Reviewed-by: Sagi Grimberg --- drivers/nvme/host/core.c | 31 +++++++++++++++++++++++++++++++ drivers/nvme/host/nvme.h | 9 +++++++++ 2 files changed, 40 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index c79500b3b157..d7912e7a9911 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4219,6 +4219,37 @@ void nvme_sync_queues(struct nvme_ctrl *ctrl) } EXPORT_SYMBOL_GPL(nvme_sync_queues); +#ifdef CONFIG_NVME_TARGET_PASSTHRU +/* + * The exports that follow within this ifdef are only for + * use by the nvmet-passthru and should not be used for + * other things. + */ + +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_GPL(nvme_ctrl_get_by_path); +#endif /* CONFIG_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 3b9cbe0668fa..356e4062796e 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -681,4 +681,13 @@ void nvme_hwmon_init(struct nvme_ctrl *ctrl); static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl) { } #endif +#ifdef CONFIG_NVME_TARGET_PASSTHRU +/* + * The exports that follow within this ifdef are only for + * use by the nvmet-passthru and should not be used for + * other things. + */ +struct nvme_ctrl *nvme_ctrl_get_by_path(const char *path); +#endif /* CONFIG_NVME_TARGET_PASSTHRU */ + #endif /* _NVME_H */ -- 2.20.1 _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme