From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 6890B2097DD18 for ; Tue, 26 Jun 2018 08:34:45 -0700 (PDT) From: Keith Busch Subject: [PATCH 2/2] libnvdimm: Export max available extent Date: Tue, 26 Jun 2018 09:37:36 -0600 Message-Id: <20180626153736.6770-4-keith.busch@intel.com> In-Reply-To: <20180626153736.6770-1-keith.busch@intel.com> References: <20180626153736.6770-1-keith.busch@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: linux-nvdimm@lists.01.org, Dan Williams , Dave Jiang , Ross Zwisler , Vishal Verma Cc: Yasunori Goto List-ID: The 'available_size' attribute showing the combined total of all unallocated space isn't always useful to know how large of a namespace a user may be able to allocate if the region is fragmented. This patch will export the largest extent of contiguous unallocated space that may be allocated to create a new namespace. Signed-off-by: Keith Busch --- drivers/nvdimm/region_devs.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 8af483d7ef57..82aaf7d6488d 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -433,6 +433,21 @@ static ssize_t available_size_show(struct device *dev, } static DEVICE_ATTR_RO(available_size); +static ssize_t max_available_extent_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + unsigned long long available = 0; + + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + available = nd_region_contiguous_max(nd_region); + nvdimm_bus_unlock(dev); + + return sprintf(buf, "%llu\n", available); +} +static DEVICE_ATTR_RO(max_available_extent); + static ssize_t init_namespaces_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -584,6 +599,7 @@ static struct attribute *nd_region_attributes[] = { &dev_attr_read_only.attr, &dev_attr_set_cookie.attr, &dev_attr_available_size.attr, + &dev_attr_max_available_extent.attr, &dev_attr_namespace_seed.attr, &dev_attr_init_namespaces.attr, &dev_attr_badblocks.attr, -- 2.14.3 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm