tree 20ab40762557164e1358a960782410c33bd4f423
parent 9e0e252a048b0ba5066f0dc15c3b2468ffe5c422
author Vishal Verma <vishal.l.verma@intel.com> 1452357411 -0800
committer Dan Williams <dan.j.williams@intel.com> 1452357411 -0800

block: Add badblock management for gendisks

NVDIMM devices, which can behave more like DRAM rather than block
devices, may develop bad cache lines, or 'poison'. A block device
exposed by the pmem driver can then consume poison via a read (or
write), and cause a machine check. On platforms without machine
check recovery features, this would mean a crash.

The block device maintaining a runtime list of all known sectors that
have poison can directly avoid this, and also provide a path forward
to enable proper handling/recovery for DAX faults on such a device.

Use the new badblock management interfaces to add a badblocks list to
gendisks.

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>