Added cxl v2.1 format region label deletion routine. This function is used to delete region label from LSA
Signed-off-by: Neeraj Kumar <[email protected]> --- drivers/nvdimm/label.c | 77 ++++++++++++++++++++++++++++++--- drivers/nvdimm/label.h | 6 +++ drivers/nvdimm/namespace_devs.c | 12 +++++ drivers/nvdimm/nd.h | 9 ++++ include/linux/libnvdimm.h | 1 + 5 files changed, 100 insertions(+), 5 deletions(-) diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c index 94f2d0ba7aca..be18278d6cea 100644 --- a/drivers/nvdimm/label.c +++ b/drivers/nvdimm/label.c @@ -1044,7 +1044,8 @@ static int init_labels(struct nd_mapping *nd_mapping, int num_labels) return max(num_labels, old_num_labels); } -static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid) +static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid, + enum label_type ltype) { struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); struct nd_label_ent *label_ent, *e; @@ -1068,8 +1069,23 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid) if (!nd_label) continue; active++; - if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid)) - continue; + + switch (ltype) { + case NS_LABEL_TYPE: + if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid)) + continue; + + break; + case RG_LABEL_TYPE: + if (!rgl_uuid_equal(&nd_label->rg_label, uuid)) + continue; + + break; + default: + dev_err(ndd->dev, "Invalid label type\n"); + return 0; + } + active--; slot = to_slot(ndd, nd_label); nd_label_free_slot(ndd, slot); @@ -1079,7 +1095,7 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid) } list_splice_tail_init(&list, &nd_mapping->labels); - if (active == 0) { + if ((ltype == NS_LABEL_TYPE) && (active == 0)) { nd_mapping_free_labels(nd_mapping); dev_dbg(ndd->dev, "no more active labels\n"); } @@ -1101,7 +1117,8 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region, int count = 0; if (size == 0) { - rc = del_labels(nd_mapping, nspm->uuid); + rc = del_labels(nd_mapping, nspm->uuid, + NS_LABEL_TYPE); if (rc) return rc; continue; @@ -1268,6 +1285,56 @@ int nd_pmem_region_label_update(struct nd_region *nd_region) return 0; } +int nd_pmem_region_label_delete(struct nd_region *nd_region) +{ + int i, rc; + struct nd_interleave_set *nd_set = nd_region->nd_set; + struct nd_label_ent *label_ent; + int ns_region_cnt = 0; + + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + + /* Find non cxl format supported ndr_mappings */ + if (!ndd->cxl) { + dev_info(&nd_region->dev, "Region label unsupported\n"); + return -EINVAL; + } + + /* Find if any NS label using this region */ + mutex_lock(&nd_mapping->lock); + list_for_each_entry(label_ent, &nd_mapping->labels, list) { + if (!label_ent->label) + continue; + + /* + * Check if any available NS labels has same + * region_uuid in LSA + */ + if (nsl_region_uuid_equal(&label_ent->label->ns_label, + &nd_set->uuid)) + ns_region_cnt++; + } + mutex_unlock(&nd_mapping->lock); + } + + if (ns_region_cnt) { + dev_dbg(&nd_region->dev, "Region/Namespace label in use\n"); + return -EBUSY; + } + + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + + rc = del_labels(nd_mapping, &nd_set->uuid, RG_LABEL_TYPE); + if (rc) + return rc; + } + + return 0; +} + int __init nd_label_init(void) { WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid)); diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h index 0f428695017d..cc14068511cf 100644 --- a/drivers/nvdimm/label.h +++ b/drivers/nvdimm/label.h @@ -30,6 +30,11 @@ enum { ND_NSINDEX_INIT = 0x1, }; +enum label_type { + RG_LABEL_TYPE, + NS_LABEL_TYPE, +}; + /** * struct nd_namespace_index - label set superblock * @sig: NAMESPACE_INDEX\0 @@ -235,4 +240,5 @@ struct nd_namespace_pmem; int nd_pmem_namespace_label_update(struct nd_region *nd_region, struct nd_namespace_pmem *nspm, resource_size_t size); int nd_pmem_region_label_update(struct nd_region *nd_region); +int nd_pmem_region_label_delete(struct nd_region *nd_region); #endif /* __LABEL_H__ */ diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index 02ae8162566c..e5c2f78ca7dd 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -244,6 +244,18 @@ int nd_region_label_update(struct nd_region *nd_region) } EXPORT_SYMBOL_GPL(nd_region_label_update); +int nd_region_label_delete(struct nd_region *nd_region) +{ + int rc; + + nvdimm_bus_lock(&nd_region->dev); + rc = nd_pmem_region_label_delete(nd_region); + nvdimm_bus_unlock(&nd_region->dev); + + return rc; +} +EXPORT_SYMBOL_GPL(nd_region_label_delete); + static int nd_namespace_label_update(struct nd_region *nd_region, struct device *dev) { diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index 15d94e3937f0..6585747154c2 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -322,6 +322,15 @@ static inline void nsl_set_region_uuid(struct nvdimm_drvdata *ndd, export_uuid(ns_label->cxl.region_uuid, uuid); } +static inline bool nsl_region_uuid_equal(struct nd_namespace_label *ns_label, + const uuid_t *uuid) +{ + uuid_t tmp; + + import_uuid(&tmp, ns_label->cxl.region_uuid); + return uuid_equal(&tmp, uuid); +} + static inline bool rgl_uuid_equal(struct cxl_region_label *rg_label, const uuid_t *uuid) { diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index b06bd45373f4..b2e16914ab52 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -310,6 +310,7 @@ int nvdimm_has_cache(struct nd_region *nd_region); int nvdimm_in_overwrite(struct nvdimm *nvdimm); bool is_nvdimm_sync(struct nd_region *nd_region); int nd_region_label_update(struct nd_region *nd_region); +int nd_region_label_delete(struct nd_region *nd_region); static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc) -- 2.34.1
