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libnvdimm: write blk label set

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After 'uuid', 'size', 'sector_size', and optionally 'alt_name' have been
set to valid values the labels on the dimm can be updated.  The
difference with the pmem case is that blk namespaces are limited to one
dimm and can cover discontiguous ranges in dpa space.

Also, after allocating label slots, it is useful for userspace to know
how many slots are left.  Export this information in sysfs.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2015-05-30 12:35:36 -04:00
parent f524bf271a
commit 0ba1c63489
6 changed files with 370 additions and 25 deletions
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25
drivers/nvdimm/dimm_devs.c
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@@ -19,6 +19,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include "nd-core.h"
#include "label.h"
#include "nd.h"
static DEFINE_IDA(dimm_ida);
@@ -296,9 +297,33 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(state);
static ssize_t available_slots_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
ssize_t rc;
u32 nfree;
if (!ndd)
return -ENXIO;
nvdimm_bus_lock(dev);
nfree = nd_label_nfree(ndd);
if (nfree - 1 > nfree) {
dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
nfree = 0;
} else
nfree--;
rc = sprintf(buf, "%d\n", nfree);
nvdimm_bus_unlock(dev);
return rc;
}
static DEVICE_ATTR_RO(available_slots);
static struct attribute *nvdimm_attributes[] = {
&dev_attr_state.attr,
&dev_attr_commands.attr,
&dev_attr_available_slots.attr,
NULL,
};