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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>
This commit is contained in:
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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7
include/linux/genhd.h
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@@ -162,6 +162,7 @@ struct disk_part_tbl {
};
struct disk_events;
struct badblocks;
#if defined(CONFIG_BLK_DEV_INTEGRITY)
@@ -213,6 +214,7 @@ struct gendisk {
struct kobject integrity_kobj;
#endif /* CONFIG_BLK_DEV_INTEGRITY */
int node_id;
struct badblocks *bb;
};
static inline struct gendisk *part_to_disk(struct hd_struct *part)
@@ -433,6 +435,11 @@ extern void add_disk(struct gendisk *disk);
extern void del_gendisk(struct gendisk *gp);
extern struct gendisk *get_gendisk(dev_t dev, int *partno);
extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
int disk_alloc_badblocks(struct gendisk *disk);
extern int disk_check_badblocks(struct gendisk *disk, sector_t s, int sectors,
sector_t *first_bad, int *bad_sectors);
extern int disk_set_badblocks(struct gendisk *disk, sector_t s, int sectors);
extern int disk_clear_badblocks(struct gendisk *disk, sector_t s, int sectors);
extern void set_device_ro(struct block_device *bdev, int flag);
extern void set_disk_ro(struct gendisk *disk, int flag);