blkcg: separate out tg_conf_updated() from tg_set_conf()
tg_set_conf() is largely consisted of parsing and setting the new
config and the follow-up application and propagation. This patch
separates out the latter part into tg_conf_updated(). This will be
used to implement interface for the unified hierarchy.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 0e17c8f..a8bb2fd 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1144,35 +1144,11 @@
return 0;
}
-static ssize_t tg_set_conf(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off, bool is_u64)
+static void tg_conf_updated(struct throtl_grp *tg)
{
- struct blkcg *blkcg = css_to_blkcg(of_css(of));
- struct blkg_conf_ctx ctx;
- struct throtl_grp *tg;
- struct throtl_service_queue *sq;
- struct blkcg_gq *blkg;
+ struct throtl_service_queue *sq = &tg->service_queue;
struct cgroup_subsys_state *pos_css;
- int ret;
- u64 v;
-
- ret = blkg_conf_prep(blkcg, &blkcg_policy_throtl, buf, &ctx);
- if (ret)
- return ret;
-
- ret = -EINVAL;
- if (sscanf(ctx.body, "%llu", &v) != 1)
- goto out_finish;
- if (!v)
- v = -1;
-
- tg = blkg_to_tg(ctx.blkg);
- sq = &tg->service_queue;
-
- if (is_u64)
- *(u64 *)((void *)tg + of_cft(of)->private) = v;
- else
- *(unsigned int *)((void *)tg + of_cft(of)->private) = v;
+ struct blkcg_gq *blkg;
throtl_log(&tg->service_queue,
"limit change rbps=%llu wbps=%llu riops=%u wiops=%u",
@@ -1186,7 +1162,7 @@
* restrictions in the whole hierarchy and allows them to bypass
* blk-throttle.
*/
- blkg_for_each_descendant_pre(blkg, pos_css, ctx.blkg)
+ blkg_for_each_descendant_pre(blkg, pos_css, tg_to_blkg(tg))
tg_update_has_rules(blkg_to_tg(blkg));
/*
@@ -1204,7 +1180,35 @@
tg_update_disptime(tg);
throtl_schedule_next_dispatch(sq->parent_sq, true);
}
+}
+static ssize_t tg_set_conf(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off, bool is_u64)
+{
+ struct blkcg *blkcg = css_to_blkcg(of_css(of));
+ struct blkg_conf_ctx ctx;
+ struct throtl_grp *tg;
+ int ret;
+ u64 v;
+
+ ret = blkg_conf_prep(blkcg, &blkcg_policy_throtl, buf, &ctx);
+ if (ret)
+ return ret;
+
+ ret = -EINVAL;
+ if (sscanf(ctx.body, "%llu", &v) != 1)
+ goto out_finish;
+ if (!v)
+ v = -1;
+
+ tg = blkg_to_tg(ctx.blkg);
+
+ if (is_u64)
+ *(u64 *)((void *)tg + of_cft(of)->private) = v;
+ else
+ *(unsigned int *)((void *)tg + of_cft(of)->private) = v;
+
+ tg_conf_updated(tg);
ret = 0;
out_finish:
blkg_conf_finish(&ctx);