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=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 BECDFC33C99 for ; Fri, 15 Nov 2019 12:28:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A8AB207DD for ; Fri, 15 Nov 2019 12:28:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727569AbfKOM2N (ORCPT ); Fri, 15 Nov 2019 07:28:13 -0500 Received: from mx2.suse.de ([195.135.220.15]:57708 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727399AbfKOM2M (ORCPT ); Fri, 15 Nov 2019 07:28:12 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 04258B203; Fri, 15 Nov 2019 12:28:10 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , James Bottomley , linux-scsi@vger.kernel.org, Hannes Reinecke , Hannes Reinecke Subject: [PATCH 1/5] scsi: add scsi_host_busy_iter() Date: Fri, 15 Nov 2019 13:27:53 +0100 Message-Id: <20191115122757.132006-2-hare@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20191115122757.132006-1-hare@suse.de> References: <20191115122757.132006-1-hare@suse.de> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add an iterator scsi_host_busy_iter() to traverse all busy commands. If locking against concurrent command completions is required it has to be provided by the caller. Signed-off-by: Hannes Reinecke --- drivers/scsi/hosts.c | 33 +++++++++++++++++++++++++++++++++ include/scsi/scsi_host.h | 5 +++++ 2 files changed, 38 insertions(+) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 55522b7162d3..b32b5186d05e 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -633,3 +633,36 @@ void scsi_flush_work(struct Scsi_Host *shost) flush_workqueue(shost->work_q); } EXPORT_SYMBOL_GPL(scsi_flush_work); + +struct scsi_host_busy_iter_data { + scsi_host_busy_iter_fn *fn; + void *priv; +}; + +static bool __scsi_host_busy_iter_fn(struct request *req, void *priv, + bool reserved) +{ + struct scsi_host_busy_iter_data *iter_data = priv; + struct scsi_cmnd *sc = blk_mq_rq_to_pdu(req); + + return iter_data->fn(sc, iter_data->priv, reserved); +} + +/** + * scsi_host_busy_iter - Iterate over all busy commands + * @shost: Pointer to Scsi_Host. + * @fn: Function to call on each busy command + * @priv: Data pointer passed to @fn + **/ +void scsi_host_busy_iter(struct Scsi_Host *shost, + scsi_host_busy_iter_fn *fn, void *priv) +{ + struct scsi_host_busy_iter_data iter_data = { + .fn = fn, + .priv = priv, + }; + + blk_mq_tagset_busy_iter(&shost->tag_set, __scsi_host_busy_iter_fn, + &iter_data); +} +EXPORT_SYMBOL_GPL(scsi_host_busy_iter); diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 2c3f0c58869b..67386c5ac71e 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -774,6 +774,11 @@ static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) extern void scsi_unblock_requests(struct Scsi_Host *); extern void scsi_block_requests(struct Scsi_Host *); +typedef bool (scsi_host_busy_iter_fn)(struct scsi_cmnd *, void *, bool); + +void scsi_host_busy_iter(struct Scsi_Host *, + scsi_host_busy_iter_fn *fn, void *priv); + struct class_container; /* -- 2.16.4