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-rw-r--r--block/blk-cgroup.h14
1 files changed, 9 insertions, 5 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 604f6d99ab92..371fe8e92ab5 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -186,7 +186,7 @@ static inline struct blkcg *css_to_blkcg(struct cgroup_subsys_state *css)
static inline struct blkcg *task_blkcg(struct task_struct *tsk)
{
- return css_to_blkcg(task_css(tsk, blkio_subsys_id));
+ return css_to_blkcg(task_css(tsk, blkio_cgrp_id));
}
static inline struct blkcg *bio_blkcg(struct bio *bio)
@@ -241,12 +241,16 @@ static inline struct blkcg_gq *pd_to_blkg(struct blkg_policy_data *pd)
*/
static inline int blkg_path(struct blkcg_gq *blkg, char *buf, int buflen)
{
- int ret;
+ char *p;
- ret = cgroup_path(blkg->blkcg->css.cgroup, buf, buflen);
- if (ret)
+ p = cgroup_path(blkg->blkcg->css.cgroup, buf, buflen);
+ if (!p) {
strncpy(buf, "<unavailable>", buflen);
- return ret;
+ return -ENAMETOOLONG;
+ }
+
+ memmove(buf, p, buf + buflen - p);
+ return 0;
}
/**