diff options
Diffstat (limited to 'drivers/nvdimm/dimm_devs.c')
| -rw-r--r-- | drivers/nvdimm/dimm_devs.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c index b55acef..101d3b7 100644 --- a/drivers/nvdimm/dimm_devs.c +++ b/drivers/nvdimm/dimm_devs.c @@ -290,6 +290,42 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data, EXPORT_SYMBOL_GPL(nvdimm_create); /** + * nd_blk_available_dpa - account the unused dpa of BLK region + * @nd_mapping: container of dpa-resource-root + labels + * + * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges. + */ +resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping) +{ + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + resource_size_t map_end, busy = 0, available; + struct resource *res; + + if (!ndd) + return 0; + + map_end = nd_mapping->start + nd_mapping->size - 1; + for_each_dpa_resource(ndd, res) + if (res->start >= nd_mapping->start && res->start < map_end) { + resource_size_t end = min(map_end, res->end); + + busy += end - res->start + 1; + } else if (res->end >= nd_mapping->start + && res->end <= map_end) { + busy += res->end - nd_mapping->start; + } else if (nd_mapping->start > res->start + && nd_mapping->start < res->end) { + /* total eclipse of the BLK region mapping */ + busy += nd_mapping->size; + } + + available = map_end - nd_mapping->start + 1; + if (busy < available) + return available - busy; + return 0; +} + +/** * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa * @nd_mapping: container of dpa-resource-root + labels * @nd_region: constrain available space check to this reference region |
