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| author | Keith Busch <keith.busch@intel.com> | 2018-07-24 15:07:58 -0600 |
|---|---|---|
| committer | Dave Jiang <dave.jiang@intel.com> | 2018-07-25 14:11:43 -0700 |
| commit | 1e687220ef2d95a582e13d8de79932bfe32fdfa8 (patch) | |
| tree | f3e15d37cff8ebc26e86a679938f4a4f276b47cb /drivers/nvdimm/region_devs.c | |
| parent | 12e3129e29b406c41bc89231092a20d79dbf802c (diff) | |
| download | lwn-1e687220ef2d95a582e13d8de79932bfe32fdfa8.tar.gz lwn-1e687220ef2d95a582e13d8de79932bfe32fdfa8.zip | |
libnvdimm: Export max available extent
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 unallocated space that may be allocated
to create a new namespace.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Diffstat (limited to 'drivers/nvdimm/region_devs.c')
| -rw-r--r-- | drivers/nvdimm/region_devs.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index c30d5af02cc2..fa37afcd43ff 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -434,6 +434,21 @@ 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_allocatable_dpa(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) { @@ -585,6 +600,7 @@ 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, |