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libnvdimm, btt: add support for blk integrity

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Support multiple block sizes (sector + metadata) using the blk integrity
framework. This registers a new integrity template that defines the
protection information tuple size based on the configured metadata size,
and simply acts as a passthrough for protection information generated by
another layer. The metadata is written to the storage as-is, and read back
with each sector.

Signed-off-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vishal Verma
2015-06-25 04:21:52 -04:00
committed by Dan Williams
parent f68eb1e71a
commit 41cd8b70c3
5 changed files with 154 additions and 18 deletions
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37
drivers/nvdimm/core.c
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@@ -13,6 +13,7 @@
#include <linux/libnvdimm.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/ctype.h>
#include <linux/ndctl.h>
@@ -361,6 +362,42 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
}
EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
#ifdef CONFIG_BLK_DEV_INTEGRITY
static int nd_pi_nop_generate_verify(struct blk_integrity_iter *iter)
{
return 0;
}
int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
{
struct blk_integrity integrity = {
.name = "ND-PI-NOP",
.generate_fn = nd_pi_nop_generate_verify,
.verify_fn = nd_pi_nop_generate_verify,
.tuple_size = meta_size,
.tag_size = meta_size,
};
int ret;
ret = blk_integrity_register(disk, &integrity);
if (ret)
return ret;
blk_queue_max_integrity_segments(disk->queue, 1);
return 0;
}
EXPORT_SYMBOL(nd_integrity_init);
#else /* CONFIG_BLK_DEV_INTEGRITY */
int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
{
return 0;
}
EXPORT_SYMBOL(nd_integrity_init);
#endif
static __init int libnvdimm_init(void)
{
int rc;