From patchwork Fri Jun 23 06:18:16 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Christie X-Patchwork-Id: 9805759 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 CD2AE600C5 for ; Fri, 23 Jun 2017 06:18:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C011A285D1 for ; Fri, 23 Jun 2017 06:18:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4D81286EC; Fri, 23 Jun 2017 06:18:32 +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,RCVD_IN_DNSWL_HI autolearn=ham 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 5B6CA285D1 for ; Fri, 23 Jun 2017 06:18:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754464AbdFWGSb (ORCPT ); Fri, 23 Jun 2017 02:18:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47316 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754448AbdFWGSb (ORCPT ); Fri, 23 Jun 2017 02:18:31 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E6AA37EBD3; Fri, 23 Jun 2017 06:18:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E6AA37EBD3 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=mchristi@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com E6AA37EBD3 Received: from rh2.redhat.com (ovpn-120-27.rdu2.redhat.com [10.10.120.27]) by smtp.corp.redhat.com (Postfix) with ESMTP id E0AA880E70; Fri, 23 Jun 2017 06:18:29 +0000 (UTC) From: Mike Christie To: bart.vanassche@wdc.com, bryantly@linux.vnet.ibm.com, pkalever@redhat.com, target-devel@vger.kernel.org, nab@linux-iscsi.org Cc: Mike Christie Subject: [PATCH 06/10] target: add helper to iterate over devices Date: Fri, 23 Jun 2017 01:18:16 -0500 Message-Id: <1498198700-6325-7-git-send-email-mchristi@redhat.com> In-Reply-To: <1498198700-6325-1-git-send-email-mchristi@redhat.com> References: <1498198700-6325-1-git-send-email-mchristi@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 23 Jun 2017 06:18:31 +0000 (UTC) Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This adds a wrapper around idr_for_each so the xcopy code can loop over the devices in the next patch. Signed-off-by: Mike Christie Reviewed-by: Bart Van Assche --- v2: Add check for configured devices. drivers/target/target_core_device.c | 45 +++++++++++++++++++++++++++++++++++ drivers/target/target_core_internal.h | 2 ++ 2 files changed, 47 insertions(+) diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index de11316..bd32a0c 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -904,6 +904,51 @@ struct se_device *target_find_device(int id, bool do_depend) } EXPORT_SYMBOL(target_find_device); +struct devices_idr_iter { + int (*fn)(struct se_device *dev, void *data); + void *data; +}; + +static int target_devices_idr_iter(int id, void *p, void *data) +{ + struct devices_idr_iter *iter = data; + struct se_device *dev = p; + + /* + * We add the device early to the idr, so it can be used + * by backend modules during configuration. We do not want + * to allow other callers to access partially setup devices, + * so we skip them here. + */ + if (!(dev->dev_flags & DF_CONFIGURED)) + return 0; + + return iter->fn(dev, iter->data); +} + +/** + * target_for_each_device - iterate over configured devices + * @fn: iterator function + * @data: pointer to data that will be passed to fn + * + * fn must return 0 to continue looping over devices. non-zero will break + * from the loop and return that value to the caller. + */ +int target_for_each_device(int (*fn)(struct se_device *dev, void *data), + void *data) +{ + struct devices_idr_iter iter; + int ret; + + iter.fn = fn; + iter.data = data; + + mutex_lock(&g_device_mutex); + ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter); + mutex_unlock(&g_device_mutex); + return ret; +} + int target_configure_device(struct se_device *dev) { struct se_hba *hba = dev->se_hba; diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h index 0912de7..1d3ac02 100644 --- a/drivers/target/target_core_internal.h +++ b/drivers/target/target_core_internal.h @@ -87,6 +87,8 @@ void core_dev_release_virtual_lun0(void); struct se_device *target_alloc_device(struct se_hba *hba, const char *name); int target_configure_device(struct se_device *dev); void target_free_device(struct se_device *); +int target_for_each_device(int (*fn)(struct se_device *dev, void *data), + void *data); /* target_core_configfs.c */ void target_setup_backend_cits(struct target_backend *);