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libnvdimm/region: Rewrite _probe_success() to _advance_seeds()

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The nd_region_probe_success() helper collides seed management with
nvdimm->busy tracking. Given the 'busy' increment is handled internal to the
nd_region driver 'probe' path move the decrement to the 'remove' path.
With that cleanup the routine can be renamed to the more descriptive
nd_region_advance_seeds().

The change is prompted by an incoming need to optionally advance the
seeds on other events besides 'probe' success.

Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/20190905154603.10349-2-aneesh.kumar@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2019-09-05 21:15:57 +05:30
parent 7b60422cb7
commit a2d1c7a61d
4 changed files with 41 additions and 71 deletions
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68
drivers/nvdimm/region_devs.c
View File

@@ -715,85 +715,37 @@ void nd_mapping_free_labels(struct nd_mapping *nd_mapping)
}
/*
* Upon successful probe/remove, take/release a reference on the
* associated interleave set (if present), and plant new btt + namespace
* seeds. Also, on the removal of a BLK region, notify the provider to
* disable the region.
* When a namespace is activated create new seeds for the next
* namespace, or namespace-personality to be configured.
*/
static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
struct device *dev, bool probe)
void nd_region_advance_seeds(struct nd_region *nd_region, struct device *dev)
{
struct nd_region *nd_region;
if (!probe && is_nd_region(dev)) {
int i;
nd_region = to_nd_region(dev);
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nvdimm_drvdata *ndd = nd_mapping->ndd;
struct nvdimm *nvdimm = nd_mapping->nvdimm;
mutex_lock(&nd_mapping->lock);
nd_mapping_free_labels(nd_mapping);
mutex_unlock(&nd_mapping->lock);
put_ndd(ndd);
nd_mapping->ndd = NULL;
if (ndd)
atomic_dec(&nvdimm->busy);
}
}
if (dev->parent && is_nd_region(dev->parent) && probe) {
nd_region = to_nd_region(dev->parent);
nvdimm_bus_lock(dev);
if (nd_region->ns_seed == dev)
nd_region_create_ns_seed(nd_region);
nvdimm_bus_unlock(dev);
}
if (is_nd_btt(dev) && probe) {
nvdimm_bus_lock(dev);
if (nd_region->ns_seed == dev) {
nd_region_create_ns_seed(nd_region);
} else if (is_nd_btt(dev)) {
struct nd_btt *nd_btt = to_nd_btt(dev);
nd_region = to_nd_region(dev->parent);
nvdimm_bus_lock(dev);
if (nd_region->btt_seed == dev)
nd_region_create_btt_seed(nd_region);
if (nd_region->ns_seed == &nd_btt->ndns->dev)
nd_region_create_ns_seed(nd_region);
nvdimm_bus_unlock(dev);
}
if (is_nd_pfn(dev) && probe) {
} else if (is_nd_pfn(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
nd_region = to_nd_region(dev->parent);
nvdimm_bus_lock(dev);
if (nd_region->pfn_seed == dev)
nd_region_create_pfn_seed(nd_region);
if (nd_region->ns_seed == &nd_pfn->ndns->dev)
nd_region_create_ns_seed(nd_region);
nvdimm_bus_unlock(dev);
}
if (is_nd_dax(dev) && probe) {
} else if (is_nd_dax(dev)) {
struct nd_dax *nd_dax = to_nd_dax(dev);
nd_region = to_nd_region(dev->parent);
nvdimm_bus_lock(dev);
if (nd_region->dax_seed == dev)
nd_region_create_dax_seed(nd_region);
if (nd_region->ns_seed == &nd_dax->nd_pfn.ndns->dev)
nd_region_create_ns_seed(nd_region);
nvdimm_bus_unlock(dev);
}
}
void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
{
nd_region_notify_driver_action(nvdimm_bus, dev, true);
}
void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
{
nd_region_notify_driver_action(nvdimm_bus, dev, false);
nvdimm_bus_unlock(dev);
}
static ssize_t mappingN(struct device *dev, char *buf, int n)