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authorVishal Verma <vishal.l.verma@intel.com>2016-01-09 19:36:51 +0300
committerDan Williams <dan.j.williams@intel.com>2016-01-09 19:36:51 +0300
commit99e6608c9e7414ae4f2168df8bf8fae3eb49e41f (patch)
tree20ab40762557164e1358a960782410c33bd4f423 /include/linux/genhd.h
parent9e0e252a048b0ba5066f0dc15c3b2468ffe5c422 (diff)
downloadlinux-99e6608c9e7414ae4f2168df8bf8fae3eb49e41f.tar.xz
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.h7
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);