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authorMartin K. Petersen <martin.petersen@oracle.com>2009-11-10 11:50:21 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-11-10 11:50:21 +0100
commit86b37281411cf1e9bc0a6b5406c45edb7bd9ea5d (patch)
tree729db57dd52054af1bc16b4afb131093dfc9d255 /include/linux/genhd.h
parentcf7c25cf91f632a3528669fc0876e1fc8355ff9b (diff)
block: Expose discard granularity
While SSDs track block usage on a per-sector basis, RAID arrays often have allocation blocks that are bigger. Allow the discard granularity and alignment to be set and teach the topology stacking logic how to handle them. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/genhd.h')
-rw-r--r--include/linux/genhd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 297df45ffd0a..c6c0c41af35f 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -91,6 +91,7 @@ struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
sector_t alignment_offset;
+ unsigned int discard_alignment;
struct device __dev;
struct kobject *holder_dir;
int policy, partno;