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libnvdimm: check and clear poison before writing to pmem

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We need to clear any poison when we are writing to pmem. The granularity
will be sector size. If it's less then we can't do anything about it
barring corruption.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
[djbw: fixup 0-length write request to succeed]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2016-11-11 12:37:36 -07:00 committed by Dan Williams
parent dafb104874
commit 82bf1037f2
1 changed files with 26 additions and 4 deletions
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30
drivers/nvdimm/claim.c
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@ -226,6 +226,12 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size, int rw)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
sector_t sector = offset >> 9;
int rc = 0;
if (unlikely(!size))
return 0;
if (unlikely(offset + size > nsio->size)) {
dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
@ -233,17 +239,33 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
}
if (rw == READ) {
unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
if (unlikely(is_bad_pmem(&nsio->bb, offset / 512, sz_align)))
if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align)))
return -EIO;
return memcpy_from_pmem(buf, nsio->addr + offset, size);
} else {
if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)) {
long cleared;
cleared = nvdimm_clear_poison(&ndns->dev,
offset, size);
if (cleared != size) {
size = cleared;
rc = -EIO;
}
badblocks_clear(&nsio->bb, sector,
cleared >> 9);
} else
rc = -EIO;
}
memcpy_to_pmem(nsio->addr + offset, buf, size);
nvdimm_flush(to_nd_region(ndns->dev.parent));
}
return 0;
return rc;
}
int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio)