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libnvdimm/pmem: Advance namespace seed for specific probe errors 

In order to support marking namespaces with unsupported feature/versions
disabled, nvdimm core should advance the namespace seed on these
probe failures. Otherwise, these failed namespaces will be considered a
seed namespace and will be wrongly used while creating new namespaces.

Add -EOPNOTSUPP as return from pmem probe callback to indicate a namespace
initialization failures due to pfn superblock feature/version mismatch.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/20190905154603.10349-3-aneesh.kumar@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Aneesh Kumar K.V 2019-09-05 21:15:58 +05:30 committed by Dan Williams
parent a2d1c7a61d
commit 1c97afa714
2 changed files with 27 additions and 5 deletions
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3
drivers/nvdimm/bus.c
View File

@ -95,7 +95,8 @@ static int nvdimm_bus_probe(struct device *dev)
rc = nd_drv->probe(dev);
debug_nvdimm_unlock(dev);
if (rc == 0 && dev->parent && is_nd_region(dev->parent))
if ((rc == 0 || rc == -EOPNOTSUPP) &&
dev->parent && is_nd_region(dev->parent))
nd_region_advance_seeds(to_nd_region(dev->parent), dev);
nvdimm_bus_probe_end(nvdimm_bus);

29
drivers/nvdimm/pmem.c
View File

@ -490,6 +490,7 @@ static int pmem_attach_disk(struct device *dev,
static int nd_pmem_probe(struct device *dev)
{
int ret;
struct nd_namespace_common *ndns;
ndns = nvdimm_namespace_common_probe(dev);
@ -505,12 +506,32 @@ static int nd_pmem_probe(struct device *dev)
if (is_nd_pfn(dev))
return pmem_attach_disk(dev, ndns);
/* if we find a valid info-block we'll come back as that personality */
if (nd_btt_probe(dev, ndns) == 0 || nd_pfn_probe(dev, ndns) == 0
|| nd_dax_probe(dev, ndns) == 0)
ret = nd_btt_probe(dev, ndns);
if (ret == 0)
return -ENXIO;
/* ...otherwise we're just a raw pmem device */
/*
* We have two failure conditions here, there is no
* info reserver block or we found a valid info reserve block
* but failed to initialize the pfn superblock.
*
* For the first case consider namespace as a raw pmem namespace
* and attach a disk.
*
* For the latter, consider this a success and advance the namespace
* seed.
*/
ret = nd_pfn_probe(dev, ndns);
if (ret == 0)
return -ENXIO;
else if (ret == -EOPNOTSUPP)
return ret;
ret = nd_dax_probe(dev, ndns);
if (ret == 0)
return -ENXIO;
else if (ret == -EOPNOTSUPP)
return ret;
return pmem_attach_disk(dev, ndns);
}