Messages in this thread | | | Date | Mon, 10 Jul 2017 15:31:18 -0600 | From | Vishal Verma <> | Subject | Re: [PATCH] libnvdimm: fix badblock range handling of ARS range |
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On 07/07, Toshi Kani wrote: > __add_badblock_range() does not account sector alignment when > it sets 'num_sectors'. Therefore, an ARS error record range > spanning across two sectors is set to a single sector length, > which leaves the 2nd sector unprotected. > > Change __add_badblock_range() to set 'num_sectors' properly. > > Fixes: 0caeef63e6d2f866d85bb507bf63e0ce8ec91cef > Signed-off-by: Toshi Kani <toshi.kani@hpe.com> > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Vishal Verma <vishal.l.verma@intel.com> > Cc: <stable@vger.kernel.org> > --- > drivers/nvdimm/core.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-)
Good find! I don't know why I assumed a poison entry spanning past the end of a sector wouldn't span past multiple sectors :)
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
> > diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c > index 2dee908..932c3994 100644 > --- a/drivers/nvdimm/core.c > +++ b/drivers/nvdimm/core.c > @@ -421,14 +421,15 @@ static void set_badblock(struct badblocks *bb, sector_t s, int num) > static void __add_badblock_range(struct badblocks *bb, u64 ns_offset, u64 len) > { > const unsigned int sector_size = 512; > - sector_t start_sector; > + sector_t start_sector, end_sector; > u64 num_sectors; > u32 rem; > > start_sector = div_u64(ns_offset, sector_size); > - num_sectors = div_u64_rem(len, sector_size, &rem); > + end_sector = div_u64_rem(ns_offset + len, sector_size, &rem); > if (rem) > - num_sectors++; > + end_sector++; > + num_sectors = end_sector - start_sector; > > if (unlikely(num_sectors > (u64)INT_MAX)) { > u64 remaining = num_sectors;
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