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| author | Dan Williams <dan.j.williams@intel.com> | 2015-05-30 16:35:36 (GMT) |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 01:24:10 (GMT) |
| commit | 0ba1c634892b3590779803a701bcb82e8c32cc7a (patch) | |
| tree | c23d1c952ec837729700b5e3c34cdb42a073b055 /drivers/nvdimm/dimm_devs.c | |
| parent | f524bf271a5cf12a44253194abcf8b6688ff5b9d (diff) | |
| download | linux-0ba1c634892b3590779803a701bcb82e8c32cc7a.tar.xz | |
libnvdimm: write blk label set
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>
Diffstat (limited to 'drivers/nvdimm/dimm_devs.c')
| -rw-r--r-- | drivers/nvdimm/dimm_devs.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c index 156d518..83b179e 100644 --- a/drivers/nvdimm/dimm_devs.c +++ b/drivers/nvdimm/dimm_devs.c @@ -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, }; |