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libnvdimm, label: add address abstraction identifiers

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Starting with v1.2 labels, 'address abstractions' can be hinted via an
address abstraction id that implies an info-block format. The standard
address abstraction in the specification is the v2 format of the
Block-Translation-Table (BTT). Support for that is saved for a later
patch, for now we add support for the Linux supported address
abstractions BTT (v1), PFN, and DAX.

The new 'holder_class' attribute for namespace devices is added for
tooling to specify the 'abstraction_guid' to store in the namespace label.
For v1.1 labels this field is undefined and any setting of
'holder_class' away from the default 'none' value will only have effect
until the driver is unloaded. Setting 'holder_class' requires that
whatever device tries to claim the namespace must be of the specified
class.

Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2017-06-04 10:18:39 +09:00
parent 355d838878
commit b3fde74ea1
10 changed files with 203 additions and 0 deletions
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58
drivers/nvdimm/label.c
View File

@@ -12,6 +12,7 @@
*/
#include <linux/device.h>
#include <linux/ndctl.h>
#include <linux/uuid.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/nd.h>
@@ -19,6 +20,10 @@
#include "label.h"
#include "nd.h"
static guid_t nvdimm_btt_guid;
static guid_t nvdimm_pfn_guid;
static guid_t nvdimm_dax_guid;
static u32 best_seq(u32 a, u32 b)
{
a &= NSINDEX_SEQ_MASK;
@@ -565,10 +570,44 @@ static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
- (unsigned long) to_namespace_index(ndd, 0);
}
enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid)
{
if (guid_equal(guid, &nvdimm_btt_guid))
return NVDIMM_CCLASS_BTT;
else if (guid_equal(guid, &nvdimm_pfn_guid))
return NVDIMM_CCLASS_PFN;
else if (guid_equal(guid, &nvdimm_dax_guid))
return NVDIMM_CCLASS_DAX;
else if (guid_equal(guid, &guid_null))
return NVDIMM_CCLASS_NONE;
return NVDIMM_CCLASS_UNKNOWN;
}
static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class,
guid_t *target)
{
if (claim_class == NVDIMM_CCLASS_BTT)
return &nvdimm_btt_guid;
else if (claim_class == NVDIMM_CCLASS_PFN)
return &nvdimm_pfn_guid;
else if (claim_class == NVDIMM_CCLASS_DAX)
return &nvdimm_dax_guid;
else if (claim_class == NVDIMM_CCLASS_UNKNOWN) {
/*
* If we're modifying a namespace for which we don't
* know the claim_class, don't touch the existing guid.
*/
return target;
} else
return &guid_null;
}
static int __pmem_label_update(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
int pos)
{
struct nd_namespace_common *ndns = &nspm->nsio.common;
struct nd_interleave_set *nd_set = nd_region->nd_set;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_label_ent *label_ent, *victim = NULL;
@@ -616,6 +655,10 @@ static int __pmem_label_update(struct nd_region *nd_region,
nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->type_guid, &nd_set->type_guid);
if (namespace_label_has(ndd, abstraction_guid))
guid_copy(&nd_label->abstraction_guid,
to_abstraction_guid(ndns->claim_class,
&nd_label->abstraction_guid));
if (namespace_label_has(ndd, checksum)) {
u64 sum;
@@ -711,6 +754,7 @@ static int __blk_label_update(struct nd_region *nd_region,
{
int i, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
struct nd_interleave_set *nd_set = nd_region->nd_set;
struct nd_namespace_common *ndns = &nsblk->common;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_namespace_label *nd_label;
struct nd_label_ent *label_ent, *e;
@@ -848,6 +892,11 @@ static int __blk_label_update(struct nd_region *nd_region,
nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->type_guid, &nd_set->type_guid);
if (namespace_label_has(ndd, abstraction_guid))
guid_copy(&nd_label->abstraction_guid,
to_abstraction_guid(ndns->claim_class,
&nd_label->abstraction_guid));
if (namespace_label_has(ndd, checksum)) {
u64 sum;
@@ -1101,3 +1150,12 @@ int nd_blk_namespace_label_update(struct nd_region *nd_region,
return __blk_label_update(nd_region, nd_mapping, nsblk, count);
}
int __init nd_label_init(void)
{
WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid));
WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid));
return 0;
}