blkcg: remove blkio_group->path[]

blkio_group->path[] stores the path of the associated cgroup and is
used only for debug messages.  Just format the path from blkg->cgroup
when printing debug messages.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 14 insertions, 7 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index eb07eb64e85b..901286b5f5cb 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -573,14 +573,21 @@ static inline void cfqg_put(struct cfq_group *cfqg)
         return blkg_put(cfqg_to_blkg(cfqg));
 }
 
-#define cfq_log_cfqq(cfqd, cfqq, fmt, args...)  \
+#define cfq_log_cfqq(cfqd, cfqq, fmt, args...)  do {                    \
+        char __pbuf[128];                                               \
+                                                                        \
+        blkg_path(cfqg_to_blkg((cfqq)->cfqg), __pbuf, sizeof(__pbuf));  \
         blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \
-                        cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
-                        blkg_path(cfqg_to_blkg((cfqq)->cfqg)), ##args)
-
-#define cfq_log_cfqg(cfqd, cfqg, fmt, args...)                          \
-        blk_add_trace_msg((cfqd)->queue, "%s " fmt,                     \
-                        blkg_path(cfqg_to_blkg((cfqg))), ##args)        \
+                          cfq_cfqq_sync((cfqq)) ? 'S' : 'A',            \
+                          __pbuf, ##args);                              \
+} while (0)
+
+#define cfq_log_cfqg(cfqd, cfqg, fmt, args...)  do {                    \
+        char __pbuf[128];                                               \
+                                                                        \
+        blkg_path(cfqg_to_blkg(cfqg), __pbuf, sizeof(__pbuf));          \
+        blk_add_trace_msg((cfqd)->queue, "%s " fmt, __pbuf, ##args);    \
+} while (0)
 
 static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg,
                                             struct cfq_group *curr_cfqg, int rw)