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| author | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 04:20:04 -0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 04:20:04 -0400 |
| commit | 8c2f7e8658df1d3b7cbfa62706941d14c715823a (patch) | |
| tree | ac93512841113f4d1d7a38d788ec73bb21e2d605 /drivers/nvdimm/region.c | |
| parent | 0ba1c634892b3590779803a701bcb82e8c32cc7a (diff) | |
| download | lwn-8c2f7e8658df1d3b7cbfa62706941d14c715823a.tar.gz lwn-8c2f7e8658df1d3b7cbfa62706941d14c715823a.zip | |
libnvdimm: infrastructure for btt devices
NVDIMM namespaces, in addition to accepting "struct bio" based requests,
also have the capability to perform byte-aligned accesses. By default
only the bio/block interface is used. However, if another driver can
make effective use of the byte-aligned capability it can claim namespace
interface and use the byte-aligned ->rw_bytes() interface.
The BTT driver is the initial first consumer of this mechanism to allow
adding atomic sector update semantics to a pmem or blk namespace. This
patch is the sysfs infrastructure to allow configuring a BTT instance
for a namespace. Enabling that BTT and performing i/o is in a
subsequent patch.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/region.c')
| -rw-r--r-- | drivers/nvdimm/region.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c index 9aba44e483e0..2a5f3f53d79d 100644 --- a/drivers/nvdimm/region.c +++ b/drivers/nvdimm/region.c @@ -33,12 +33,13 @@ static int nd_region_probe(struct device *dev) num_ns->count = rc + err; dev_set_drvdata(dev, num_ns); + if (rc && err && rc == err) + return -ENODEV; + + nd_region->btt_seed = nd_btt_create(nd_region); if (err == 0) return 0; - if (rc == err) - return -ENODEV; - /* * Given multiple namespaces per region, we do not want to * disable all the successfully registered peer namespaces upon @@ -66,6 +67,7 @@ static int nd_region_remove(struct device *dev) /* flush attribute readers and disable */ nvdimm_bus_lock(dev); nd_region->ns_seed = NULL; + nd_region->btt_seed = NULL; dev_set_drvdata(dev, NULL); nvdimm_bus_unlock(dev); |