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libnvdimm, pmem: nvdimm_read_bytes() badblocks support

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Support badblock checking in all the pmem read paths that do not go
through the block layer.  This protects info block reads (btt or pfn) as
well as data reads to a pmem namespace via a btt instance.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-01-04 23:31:24 -08:00
parent 57f7f317ab
commit 710d69cc99
1 changed files with 10 additions and 2 deletions
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12
drivers/nvdimm/pmem.c
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@ -229,6 +229,7 @@ static int pmem_attach_disk(struct device *dev,
disk->driverfs_dev = dev;
set_capacity(disk, (pmem->size - pmem->data_offset) / 512);
pmem->pmem_disk = disk;
devm_exit_badblocks(dev, &pmem->bb);
if (devm_init_badblocks(dev, &pmem->bb))
return -ENOMEM;
nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset);
@ -250,9 +251,13 @@ static int pmem_rw_bytes(struct nd_namespace_common *ndns,
return -EFAULT;
}
if (rw == READ)
if (rw == READ) {
unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align)))
return -EIO;
memcpy_from_pmem(buf, pmem->virt_addr + offset, size);
else {
} else {
memcpy_to_pmem(pmem->virt_addr + offset, buf, size);
wmb_pmem();
}
@ -427,6 +432,9 @@ static int nd_pmem_probe(struct device *dev)
pmem->ndns = ndns;
dev_set_drvdata(dev, pmem);
ndns->rw_bytes = pmem_rw_bytes;
if (devm_init_badblocks(dev, &pmem->bb))
return -ENOMEM;
nvdimm_namespace_add_poison(ndns, &pmem->bb, 0);
if (is_nd_btt(dev))
return nvdimm_namespace_attach_btt(ndns);