Currently, blktrace will not show requests that don't have any data as rq->__sector is initialized to -1 which is out of device range and thus discarded by act_log_check(). This is most notably the case for cache flush requests sent to the device. Fix the problem by making blk_rq_trace_sector() return 0 for requests without initialized sector.
Signed-off-by: Jan Kara <[email protected]> --- include/linux/blktrace_api.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h index 8804753805ac..353fd8c70760 100644 --- a/include/linux/blktrace_api.h +++ b/include/linux/blktrace_api.h @@ -116,7 +116,8 @@ extern void blk_fill_rwbs(char *rwbs, unsigned int op, int bytes); static inline sector_t blk_rq_trace_sector(struct request *rq) { - return blk_rq_is_passthrough(rq) ? 0 : blk_rq_pos(rq); + return (blk_rq_is_passthrough(rq) || blk_rq_pos(rq) == (sector_t)-1) ? + 0 : blk_rq_pos(rq); } static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq) -- 2.16.4
