blktrace: support discard requests

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

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index d084b8d227a5..27da2cc682ee 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -21,6 +21,7 @@ enum blktrace_cat {
         BLK_TC_NOTIFY   = 1 << 10,      /* special message */
         BLK_TC_AHEAD    = 1 << 11,      /* readahead */
         BLK_TC_META     = 1 << 12,      /* metadata */
+        BLK_TC_DISCARD  = 1 << 13,      /* discard requests */
 
         BLK_TC_END      = 1 << 15,      /* only 16-bits, reminder */
 };
@@ -195,6 +196,9 @@ static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
         if (likely(!bt))
                 return;
 
+        if (blk_discard_rq(rq))
+                rw |= (1 << BIO_RW_DISCARD);
+
         if (blk_pc_request(rq)) {
                 what |= BLK_TC_ACT(BLK_TC_PC);
                 __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);