Support 'discard sectors' operation in translation layer support core

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 26ececbbebe2..727886d25c4e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -81,6 +81,7 @@ enum {
          */
         REQ_LB_OP_EJECT = 0x40,         /* eject request */
         REQ_LB_OP_FLUSH = 0x41,         /* flush device */
+        REQ_LB_OP_DISCARD = 0x42,       /* discard sectors */
 };
 
 /*
diff --git a/include/linux/mtd/blktrans.h b/include/linux/mtd/blktrans.h
index 310e61606415..8b4aa0523db7 100644
--- a/include/linux/mtd/blktrans.h
+++ b/include/linux/mtd/blktrans.h
@@ -41,6 +41,8 @@ struct mtd_blktrans_ops {
                     unsigned long block, char *buffer);
         int (*writesect)(struct mtd_blktrans_dev *dev,
                      unsigned long block, char *buffer);
+        int (*discard)(struct mtd_blktrans_dev *dev,
+                       unsigned long block, unsigned nr_blocks);
 
         /* Block layer ioctls */
         int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);