Untangle the if/else sequence setting the trace action in
__blk_add_trace() and turn it into a switch statement for better
extensibility.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 kernel/trace/blktrace.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 51745832c713..11e264f67851 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -278,10 +278,19 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
 	what |= MASK_TC_BIT(opf, META);
 	what |= MASK_TC_BIT(opf, PREFLUSH);
 	what |= MASK_TC_BIT(opf, FUA);
-	if (op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)
+
+	switch (op) {
+	case REQ_OP_DISCARD:
+	case REQ_OP_SECURE_ERASE:
 		what |= BLK_TC_ACT(BLK_TC_DISCARD);
-	if (op == REQ_OP_FLUSH)
+		break;
+	case REQ_OP_FLUSH:
 		what |= BLK_TC_ACT(BLK_TC_FLUSH);
+		break;
+	default:
+		break;
+	}
+
 	if (cgid)
 		what |= __BLK_TA_CGROUP;
 
-- 
2.51.0