[PATCH] blktrace: Add 'P' identifier to mark I/O with REQ_POLLED flag

[Yongpeng Yang <yangyongpeng1@xxxxxxxx>]

blk_fill_rwbs function currently does not recognize REQ_POLLED I/O,
it's not convenient to trace the I/O handling process on the
HCTX_TYPE_POLL type hardware queue. Add a 'P' identifier to 'rwbs'
to mark such I/O for tracing.

Signed-off-by: Yongpeng Yang <yangyongpeng1@xxxxxxxx>
---
 kernel/trace/blktrace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 8fd292d34d89..69b7857d0189 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1908,6 +1908,8 @@ void blk_fill_rwbs(char *rwbs, blk_opf_t opf)
 		rwbs[i++] = 'S';
 	if (opf & REQ_META)
 		rwbs[i++] = 'M';
+	if (opf & REQ_POLLED)
+		rwbs[i++] = 'P';
 
 	rwbs[i] = '\0';
 }
-- 
2.40.1