[PATCH] blktrace: fix read-ahead bit
It should be toggling the same bit on and off, fix it up.
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/block/blktrace.c b/block/blktrace.c
index b8c0702..265f7a8 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -80,7 +80,7 @@
#define trace_sync_bit(rw) \
(((rw) & (1 << BIO_RW_SYNC)) >> (BIO_RW_SYNC - 1))
#define trace_ahead_bit(rw) \
- (((rw) & (1 << BIO_RW_AHEAD)) << (BIO_RW_AHEAD - 0))
+ (((rw) & (1 << BIO_RW_AHEAD)) << (2 - BIO_RW_AHEAD))
/*
* The worker for the various blk_add_trace*() types. Fills out a
