From abe8b4e3cef88b8202641d63f5ad58141b970b0f Mon Sep 17 00:00:00 2001 From: Vishal Verma Date: Wed, 27 Jul 2016 16:38:59 -0600 Subject: nvdimm, btt: add a size attribute for BTTs To be consistent with other namespaces, expose a 'size' attribute for BTT devices also. Cc: Dan Williams Reported-by: Linda Knippers Signed-off-by: Vishal Verma Signed-off-by: Dan Williams --- drivers/nvdimm/btt_devs.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'drivers/nvdimm/btt_devs.c') diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c index 3fa7919f94a8..97dd2925ed6e 100644 --- a/drivers/nvdimm/btt_devs.c +++ b/drivers/nvdimm/btt_devs.c @@ -140,10 +140,30 @@ static ssize_t namespace_store(struct device *dev, } static DEVICE_ATTR_RW(namespace); +static ssize_t size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + ssize_t rc; + + device_lock(dev); + if (dev->driver) + rc = sprintf(buf, "%llu\n", nd_btt->size); + else { + /* no size to convey if the btt instance is disabled */ + rc = -ENXIO; + } + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(size); + static struct attribute *nd_btt_attributes[] = { &dev_attr_sector_size.attr, &dev_attr_namespace.attr, &dev_attr_uuid.attr, + &dev_attr_size.attr, NULL, }; -- cgit v1.2.2