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| author | Vishal Verma <vishal.l.verma@intel.com> | 2016-01-09 08:36:51 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-01-09 08:36:51 -0800 |
| commit | 99e6608c9e7414ae4f2168df8bf8fae3eb49e41f (patch) | |
| tree | 20ab40762557164e1358a960782410c33bd4f423 /include/linux/genhd.h | |
| parent | 9e0e252a048b0ba5066f0dc15c3b2468ffe5c422 (diff) | |
| download | lwn-99e6608c9e7414ae4f2168df8bf8fae3eb49e41f.tar.gz lwn-99e6608c9e7414ae4f2168df8bf8fae3eb49e41f.zip | |
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>
Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 847cc1d91634..0bbec6880051 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -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); |