bcache: bcache_write tracepoint was crashing

Signed-off-by: Kent Overstreet <kmo@daterainc.com>

2 files changed, 11 insertions, 7 deletions

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 15fff4f68a7c..62e6e98186b5 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -311,7 +311,8 @@ void bch_data_insert(struct closure *cl)
 {
         struct data_insert_op *op = container_of(cl, struct data_insert_op, cl);
 
-        trace_bcache_write(op->bio, op->writeback, op->bypass);
+        trace_bcache_write(op->c, op->inode, op->bio,
+                           op->writeback, op->bypass);
 
         bch_keylist_init(&op->insert_keys);
         bio_get(op->bio);
diff --git a/include/trace/events/bcache.h b/include/trace/events/bcache.h
index c9c3c044b32f..6778e4135a8e 100644
--- a/include/trace/events/bcache.h
+++ b/include/trace/events/bcache.h
@@ -148,11 +148,13 @@ TRACE_EVENT(bcache_read,
 );
 
 TRACE_EVENT(bcache_write,
-        TP_PROTO(struct bio *bio, bool writeback, bool bypass),
-        TP_ARGS(bio, writeback, bypass),
+        TP_PROTO(struct cache_set *c, u64 inode, struct bio *bio,
+                bool writeback, bool bypass),
+        TP_ARGS(c, inode, bio, writeback, bypass),
 
         TP_STRUCT__entry(
-                __field(dev_t,          dev                     )
+                __array(char,           uuid,   16              )
+                __field(u64,            inode                   )
                 __field(sector_t,       sector                  )
                 __field(unsigned int,   nr_sector               )
                 __array(char,           rwbs,   6               )
@@ -161,7 +163,8 @@ TRACE_EVENT(bcache_write,
         ),
 
         TP_fast_assign(
-                __entry->dev            = bio->bi_bdev->bd_dev;
+                memcpy(__entry->uuid, c->sb.set_uuid, 16);
+                __entry->inode          = inode;
                 __entry->sector         = bio->bi_iter.bi_sector;
                 __entry->nr_sector      = bio->bi_iter.bi_size >> 9;
                 blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
@@ -169,8 +172,8 @@ TRACE_EVENT(bcache_write,
                 __entry->bypass = bypass;
         ),
 
-        TP_printk("%d,%d  %s %llu + %u hit %u bypass %u",
-                  MAJOR(__entry->dev), MINOR(__entry->dev),
+        TP_printk("%pU inode %llu  %s %llu + %u hit %u bypass %u",
+                  __entry->uuid, __entry->inode,
                   __entry->rwbs, (unsigned long long)__entry->sector,
                   __entry->nr_sector, __entry->writeback, __entry->bypass)
 );