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| author | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 11:20:04 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 11:20:04 +0300 |
| commit | 8c2f7e8658df1d3b7cbfa62706941d14c715823a (patch) | |
| tree | ac93512841113f4d1d7a38d788ec73bb21e2d605 /drivers/nvdimm/bus.c | |
| parent | 0ba1c634892b3590779803a701bcb82e8c32cc7a (diff) | |
| download | linux-8c2f7e8658df1d3b7cbfa62706941d14c715823a.tar.xz | |
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/bus.c')
| -rw-r--r-- | drivers/nvdimm/bus.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index ca802702440e..dd12f38397db 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -14,8 +14,10 @@ #include <linux/vmalloc.h> #include <linux/uaccess.h> #include <linux/module.h> +#include <linux/blkdev.h> #include <linux/fcntl.h> #include <linux/async.h> +#include <linux/genhd.h> #include <linux/ndctl.h> #include <linux/sched.h> #include <linux/slab.h> @@ -103,6 +105,7 @@ static int nvdimm_bus_probe(struct device *dev) dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name, dev_name(dev), rc); + if (rc != 0) module_put(provider); return rc; @@ -163,14 +166,19 @@ static void nd_async_device_unregister(void *d, async_cookie_t cookie) put_device(dev); } -void nd_device_register(struct device *dev) +void __nd_device_register(struct device *dev) { dev->bus = &nvdimm_bus_type; - device_initialize(dev); get_device(dev); async_schedule_domain(nd_async_device_register, dev, &nd_async_domain); } + +void nd_device_register(struct device *dev) +{ + device_initialize(dev); + __nd_device_register(dev); +} EXPORT_SYMBOL(nd_device_register); void nd_device_unregister(struct device *dev, enum nd_async_mode mode) |