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authorTejun Heo <tj@kernel.org>2015-08-18 14:55:32 -0700
committerJens Axboe <axboe@fb.com>2015-08-18 15:49:18 -0700
commit69948b070ee2bc3cc253e862cbe2bb09b173d7bd (patch)
treec32f9439d234f7325c7de5c24aba5e97bcde0d70 /block/blk-throttle.c
parent36aa9e5f591e84d67aad2c5bff75e413d77660dd (diff)
downloadlinux-69948b070ee2bc3cc253e862cbe2bb09b173d7bd.tar.bz2
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>
Diffstat (limited to 'block/blk-throttle.c')
-rw-r--r--block/blk-throttle.c60
1 files changed, 32 insertions, 28 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 0e17c8f92d25..a8bb2fd8f523 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1144,35 +1144,11 @@ static int tg_print_conf_uint(struct seq_file *sf, void *v)
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 @@ static ssize_t tg_set_conf(struct kernfs_open_file *of,
* 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 @@ static ssize_t tg_set_conf(struct kernfs_open_file *of,
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);