Clearing out the poison in the metadata block of the namespace before we use it. Range from start + 8k to pfn_sb->dataoff. Signed-off-by: Dave Jiang <dave.jiang(a)intel.com&gt; --- drivers/nvdimm/pfn_devs.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index cea8350..7fa428e 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -527,11 +527,39 @@ static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn, .base_pfn = init_altmap_base(base), .reserve = init_altmap_reserve(base), }; + sector_t sector; + resource_size_t meta_start, meta_size; + long cleared; + unsigned int sz_align; memcpy(res, &nsio->res, sizeof(*res)); res->start += start_pad; res->end -= end_trunc; + meta_start = res->start + SZ_8K; + meta_size = offset - meta_start + 1; + + if (meta_start + meta_size > offset) + return ERR_PTR(-EINVAL); + + sector = meta_start >> 9; + sz_align = ALIGN(meta_size + (meta_start & (512 - 1)), 512); + + if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) { + if (!IS_ALIGNED(meta_start, 512) || + !IS_ALIGNED(meta_size, 512)) + return ERR_PTR(-EIO); + + cleared = nvdimm_clear_poison(&nd_pfn->dev, + meta_start, meta_size); + if (cleared <= 0) + return ERR_PTR(-EIO); + + badblocks_clear(&nsio->bb, sector, cleared >> 9); + if (cleared != meta_size) + return ERR_PTR(-EIO); + } + if (nd_pfn->mode == PFN_MODE_RAM) { if (offset < SZ_8K) return ERR_PTR(-EINVAL);