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libnvdimm/pfn_dev: Don't clear device memmap area during generic namespace probe

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nvdimm core use nd_pfn_validate when looking for devdax or fsdax namespace. In this
case device resources are allocated against nd_namespace_io dev. In-order to
allow remap of range in nd_pfn_clear_memmap_error(), move the device memmap
area clearing while initializing pfn namespace. With this device
resource are allocated against nd_pfn and we can use nd_pfn->dev for remapping.

This also avoids calling nd_pfn_clear_mmap_errors twice. Once while probing the
namespace and second while initializing a pfn namespace.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/20191101032728.113001-1-aneesh.kumar@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Aneesh Kumar K.V 2019-11-01 08:57:28 +05:30 committed by Dan Williams
parent 2f4741497c
commit c1f45d86a5
1 changed files with 7 additions and 1 deletions
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8
drivers/nvdimm/pfn_devs.c
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@ -591,7 +591,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
return -ENXIO;
}
return nd_pfn_clear_memmap_errors(nd_pfn);
return 0;
}
EXPORT_SYMBOL(nd_pfn_validate);
@ -729,6 +729,8 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
sig = PFN_SIG;
rc = nd_pfn_validate(nd_pfn, sig);
if (rc == 0)
return nd_pfn_clear_memmap_errors(nd_pfn);
if (rc != -ENODEV)
return rc;
@ -796,6 +798,10 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
pfn_sb->checksum = cpu_to_le64(checksum);
rc = nd_pfn_clear_memmap_errors(nd_pfn);
if (rc)
return rc;
return nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0);
}