blkcg currently returns -EINVAL for most errors which can be pretty
confusing given that the failure modes are quite varied. Update the
error returns so that
* -EINVAL only for syntactic errors.
* -ERANGE if the value is out of range.
* -ENODEV if the target device can't be found.
* -EOPNOTSUPP if the policy is not enabled on the target device.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
block/blk-cgroup.c | 12 ++++++------
block/cfq-iosched.c | 2 +-
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 63c0914..a192f98 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -179,7 +179,7 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
/* blkg holds a reference to blkcg */
if (!css_tryget_online(&blkcg->css)) {
- ret = -EINVAL;
+ ret = -ENODEV;
goto err_free_blkg;
}
@@ -205,7 +205,7 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
if (blkcg_parent(blkcg)) {
blkg->parent = __blkg_lookup(blkcg_parent(blkcg), q, false);
if (WARN_ON_ONCE(!blkg->parent)) {
- ret = -EINVAL;
+ ret = -ENODEV;
goto err_put_congested;
}
blkg_get(blkg->parent);
@@ -279,7 +279,7 @@ struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
* we shouldn't allow anything to go through for a bypassing queue.
*/
if (unlikely(blk_queue_bypass(q)))
- return ERR_PTR(blk_queue_dying(q) ? -EINVAL : -EBUSY);
+ return ERR_PTR(blk_queue_dying(q) ? -ENODEV : -EBUSY);
blkg = __blkg_lookup(blkcg, q, true);
if (blkg)
@@ -792,10 +792,10 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
disk = get_gendisk(MKDEV(major, minor), &part);
if (!disk)
- return -EINVAL;
+ return -ENODEV;
if (part) {
put_disk(disk);
- return -EINVAL;
+ return -ENODEV;
}
rcu_read_lock();
@@ -804,7 +804,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
if (blkcg_policy_enabled(disk->queue, pol))
blkg = blkg_lookup_create(blkcg, disk->queue);
else
- blkg = ERR_PTR(-EINVAL);
+ blkg = ERR_PTR(-EOPNOTSUPP);
if (IS_ERR(blkg)) {
ret = PTR_ERR(blkg);
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index bcf4026..38277e3 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1755,7 +1755,7 @@ static ssize_t __cfqg_set_weight_device(struct kernfs_open_file *of,
cfqg = blkg_to_cfqg(ctx.blkg);
cfqgd = blkcg_to_cfqgd(blkcg);
- ret = -EINVAL;
+ ret = -ERANGE;
if (!ctx.v || (ctx.v >= CFQ_WEIGHT_MIN && ctx.v <= CFQ_WEIGHT_MAX)) {
if (!is_leaf_weight) {
cfqg->dev_weight = ctx.v;
--
2.4.3
--
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