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cfq-iosched: fix the setting of IOPS mode on SSDs

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A previous commit wanted to make CFQ default to IOPS mode on
non-rotational storage, however it did so when the queue was
initialized and the non-rotational flag is only set later on
in the probe.

Add an elevator hook that gets called off the add_disk() path,
at that point we know that feature probing has finished, and
we can reliably check for the various flags that drivers can
set.

Fixes: 41c0126b ("block: Make CFQ default to IOPS mode on SSDs")
Tested-by: Romain Francoise <romain@orebokech.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe
2015-06-10 08:01:20 -06:00
parent ae11f7efda
commit 0bb979472a
3 changed files with 18 additions and 1 deletions
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block/elevator.c
+2
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@@ -810,6 +810,8 @@ int elv_register_queue(struct request_queue *q)
}
kobject_uevent(&e->kobj, KOBJ_ADD);
e->registered = 1;
if (e->type->ops.elevator_registered_fn)
e->type->ops.elevator_registered_fn(q);
}
return error;
}