diff options
| author | Tejun Heo <tj@kernel.org> | 2012-04-16 13:57:23 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-04-20 10:06:16 +0200 |
| commit | 54e7ed12bad1e3aa2a28558fab6850240465f973 (patch) | |
| tree | 907eb0451782f4eb1ad3f9236e51ec4acb7fb941 /block/blk-cgroup.h | |
| parent | c94bed89995e638e43a6663177358b9d20617361 (diff) | |
| download | lwn-54e7ed12bad1e3aa2a28558fab6850240465f973.tar.gz lwn-54e7ed12bad1e3aa2a28558fab6850240465f973.zip | |
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>
Diffstat (limited to 'block/blk-cgroup.h')
| -rw-r--r-- | block/blk-cgroup.h | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index ef6550a67a69..c524267e4f7f 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -77,8 +77,6 @@ struct blkio_group { struct list_head q_node; struct hlist_node blkcg_node; struct blkio_cgroup *blkcg; - /* Store cgroup path */ - char path[128]; /* reference count */ int refcnt; @@ -167,9 +165,24 @@ static inline struct blkio_group *pdata_to_blkg(void *pdata) return NULL; } -static inline char *blkg_path(struct blkio_group *blkg) +/** + * blkg_path - format cgroup path of blkg + * @blkg: blkg of interest + * @buf: target buffer + * @buflen: target buffer length + * + * Format the path of the cgroup of @blkg into @buf. + */ +static inline int blkg_path(struct blkio_group *blkg, char *buf, int buflen) { - return blkg->path; + int ret; + + rcu_read_lock(); + ret = cgroup_path(blkg->blkcg->css.cgroup, buf, buflen); + rcu_read_unlock(); + if (ret) + strncpy(buf, "<unavailable>", buflen); + return ret; } /** |