[PATCH] btt: Cleaned up patches for SEEK additions, DM, Q2A and seek fixes

Added changes to handle DM devices:

- Used __pad field in struct blk_io_trace_remap to store from device,
  contains partition device information. Required modification in
  blkparse_fmt.c:process_default() to handle this change.

- To better handle DM devices, noted that REMAP traces can refer to other
  REMAP traces, and thus added A_A and A_Q types (much like Q_A and Q_X)
  types.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 4 insertions, 0 deletions

diff --git a/btt/inlines.h b/btt/inlines.h
index 4b7f10e..6c7c640 100644
--- a/btt/inlines.h
+++ b/btt/inlines.h
@@ -111,6 +111,10 @@ static inline struct list_head *dip_get_head(struct d_info *dip,
 
 static inline struct list_head *dip_get_head_dev(__u32 dev, enum iop_type type)
 {
+	struct d_info *dip = __dip_find(dev);
+
+	if (!dip) 
+		return NULL;
 	return dip_get_head(__dip_find(dev), type);
 }