block: Add badblock management for gendisks

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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>

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Vishal Verma 2016-01-09 08:36:51 -08:00 • committed by Dan Williams

parent 9e0e252a04

commit 99e6608c9e

2 changed files with 83 additions and 0 deletions

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76

block/genhd.c

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7

include/linux/genhd.h

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