diff options
Diffstat (limited to 'drivers/nvdimm/label.c')
| -rw-r--r-- | drivers/nvdimm/label.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c index 43bad0d5bdb6..563f24af01b5 100644 --- a/drivers/nvdimm/label.c +++ b/drivers/nvdimm/label.c @@ -417,6 +417,44 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd) return 0; } +int nd_label_data_init(struct nvdimm_drvdata *ndd) +{ + size_t config_size, read_size; + int rc = 0; + + if (ndd->data) + return 0; + + if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0) { + dev_dbg(ndd->dev, "failed to init config data area: (%u:%u)\n", + ndd->nsarea.max_xfer, ndd->nsarea.config_size); + return -ENXIO; + } + + /* + * We need to determine the maximum index area as this is the section + * we must read and validate before we can start processing labels. + * + * If the area is too small to contain the two indexes and 2 labels + * then we abort. + * + * Start at a label size of 128 as this should result in the largest + * possible namespace index size. + */ + ndd->nslabel_size = 128; + read_size = sizeof_namespace_index(ndd) * 2; + if (!read_size) + return -ENXIO; + + /* Allocate config data */ + config_size = ndd->nsarea.config_size; + ndd->data = kvzalloc(config_size, GFP_KERNEL); + if (!ndd->data) + return -ENOMEM; + + return nvdimm_get_config_data(ndd, ndd->data, 0, config_size); +} + int nd_label_active_count(struct nvdimm_drvdata *ndd) { struct nd_namespace_index *nsindex; |