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libnvdimm: blk labels and namespace instantiation

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A blk label set describes a namespace comprised of one or more
discontiguous dpa ranges on a single dimm.  They may alias with one or
more pmem interleave sets that include the given dimm.

This is the runtime/volatile configuration infrastructure for sysfs
manipulation of 'alt_name', 'uuid', 'size', and 'sector_size'.  A later
patch will make these settings persistent by writing back the label(s).

Unlike pmem namespaces, multiple blk namespaces can be created per
region.  Once a blk namespace has been created a new seed device
(unconfigured child of a parent blk region) is instantiated.  As long as
a region has 'available_size' != 0 new child namespaces may be created.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2015-05-01 13:34:01 -04:00
parent bf9bccc14c
commit 1b40e09a12
8 changed files with 594 additions and 38 deletions
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25
include/linux/nd.h
View file

@ -50,6 +50,26 @@ struct nd_namespace_pmem {
u8 *uuid;
};
/**
* struct nd_namespace_blk - namespace for dimm-bounded persistent memory
* @dev: namespace device creation by the nd region driver
* @alt_name: namespace name supplied in the dimm label
* @uuid: namespace name supplied in the dimm label
* @id: ida allocated id
* @lbasize: blk namespaces have a native sector size when btt not present
* @num_resources: number of dpa extents to claim
* @res: discontiguous dpa extents for given dimm
*/
struct nd_namespace_blk {
struct device dev;
char *alt_name;
u8 *uuid;
int id;
unsigned long lbasize;
int num_resources;
struct resource **res;
};
static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
{
return container_of(dev, struct nd_namespace_io, dev);
@ -62,6 +82,11 @@ static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
return container_of(nsio, struct nd_namespace_pmem, nsio);
}
static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
{
return container_of(dev, struct nd_namespace_blk, dev);
}
#define MODULE_ALIAS_ND_DEVICE(type) \
MODULE_ALIAS("nd:t" __stringify(type) "*")
#define ND_DEVICE_MODALIAS_FMT "nd:t%d"