From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Bryant G. Ly" Subject: [PATCH v4 1/5] tcmu: Support emulate_write_cache Date: Tue, 6 Jun 2017 09:28:48 -0500 Message-ID: <1496759332-35216-2-git-send-email-bryantly@linux.vnet.ibm.com> References: <1496759332-35216-1-git-send-email-bryantly@linux.vnet.ibm.com> Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:39122 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751399AbdFFO3C (ORCPT ); Tue, 6 Jun 2017 10:29:02 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v56EOcbN061082 for ; Tue, 6 Jun 2017 10:29:02 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0b-001b2d01.pphosted.com with ESMTP id 2awp6bt421-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 06 Jun 2017 10:29:01 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 6 Jun 2017 10:29:00 -0400 In-Reply-To: <1496759332-35216-1-git-send-email-bryantly@linux.vnet.ibm.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: nab@linux-iscsi.org, mchristi@redhat.com Cc: seroyer@linux.vnet.ibm.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, "Bryant G. Ly" This will enable the toggling of write_cache in tcmu through targetcli-fb Signed-off-by: Bryant G. Ly Reviewed-By: Mike Christie --- drivers/target/target_core_user.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index beb5f09..0c797cc 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -1290,6 +1290,8 @@ static int tcmu_configure_device(struct se_device *dev) /* Other attributes can be configured in userspace */ if (!dev->dev_attrib.hw_max_sectors) dev->dev_attrib.hw_max_sectors = 128; + if (!dev->dev_attrib.emulate_write_cache) + dev->dev_attrib.emulate_write_cache = 0; dev->dev_attrib.hw_queue_depth = 128; /* @@ -1546,6 +1548,32 @@ static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *pag } CONFIGFS_ATTR(tcmu_, cmd_time_out); +static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, + char *page) +{ + struct se_dev_attrib *da = container_of(to_config_group(item), + struct se_dev_attrib, da_group); + + return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); +} + +static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_dev_attrib *da = container_of(to_config_group(item), + struct se_dev_attrib, da_group); + int val; + int ret; + + ret = kstrtouint(page, 0, &val); + if (ret < 0) + return ret; + + da->emulate_write_cache = val; + return count; +} +CONFIGFS_ATTR(tcmu_, emulate_write_cache); + static struct configfs_attribute **tcmu_attrs; static struct target_backend_ops tcmu_ops = { @@ -1682,6 +1710,8 @@ static int __init tcmu_module_init(void) tcmu_attrs[i] = passthrough_attrib_attrs[i]; } tcmu_attrs[i] = &tcmu_attr_cmd_time_out; + i++; + tcmu_attrs[i] = &tcmu_attr_emulate_write_cache; tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; ret = transport_backend_register(&tcmu_ops); -- 2.5.4 (Apple Git-61)