On 07/26, Linda Knippers wrote:
> My system has 4 8G NVDIMMs and I have them configured in different ways, as
> you can
> see from the ndctl output:
>
> $ ndctl list
> [
> {
> "dev":"namespace3.0",
> "mode":"raw",
> "size":8589934592,
> "blockdev":"pmem3"
> },
> {
> "dev":"namespace2.0",
> "mode":"memory",
> "size":8587837440,
> "uuid":"2567d762-68ae-486b-a6eb-2d3ab1b9dca9",
> "blockdev":"pmem2"
> },
> {
> "dev":"namespace1.0",
> "mode":"sector",
> "uuid":"44fb474e-7db8-4438-ad95-05ecb9f2075e",
> "sector_size":4096,
> "blockdev":"pmem1s"
> },
> {
> "dev":"namespace0.0",
> "mode":"memory",
> "size":8453619712,
> "uuid":"933ed54b-5b64-47f1-8409-c88f7c846522",
> "blockdev":"pmem0"
> }
> ]
>
> The two memory namespaces have different sizes because one is --map=dev and
> the other is --map=mem.
> It would be nice if the map option was displayed but my question is about the
> size value for the
> btt device, or lack of one.
>
> All the namespaces show a size except for the btt. The btt only shows a
> sector size. There
> is no size value exposed by the btt sysfs information, which is probably why
> it's not in ndctl.
>
> I know the size can be gotten from the block device but it looks like an
> omission here.
> Is this a bug or a feature?
Probably an omission :)
This patch should expose a size attribute in sysfs:
$ cat /sys/bus/nd/devices/btt7.0/size
32440320
I can look at the 'ndctl list' enabling too if this looks good.
8<------
>From fb119bf4380d1d65d82754e581bbd41161c2100f Mon Sep 17 00:00:00 2001
From: Vishal Verma <[email protected]>
Date: Tue, 26 Jul 2016 14:54:39 -0600
Subject: [PATCH] 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 <[email protected]>
Reported-by: Linda Knippers <[email protected]>
Signed-off-by: Vishal Verma <[email protected]>
---
drivers/nvdimm/btt.c | 1 +
drivers/nvdimm/btt_devs.c | 15 +++++++++++++++
drivers/nvdimm/nd.h | 1 +
3 files changed, 17 insertions(+)
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 68a7c3c..71ce0dc 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1270,6 +1270,7 @@ static int btt_blk_init(struct btt *btt)
}
}
set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);
+ btt->nd_btt->size = btt->nlba * btt->sector_size;
revalidate_disk(btt->btt_disk);
return 0;
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index 3fa7919..b54cfc7 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -140,10 +140,25 @@ 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;
+
+ nvdimm_bus_lock(dev);
+ rc = sprintf(buf, "%llu\n", nd_btt->size);
+ nvdimm_bus_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,
};
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 4047639..8024a0e 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -143,6 +143,7 @@ struct nd_btt {
struct nd_namespace_common *ndns;
struct btt *btt;
unsigned long lbasize;
+ u64 size;
u8 *uuid;
int id;
};
--
2.7.4
>
> -- ljk
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