tree 27cf4730d269d037ad5b0db1f89d5ecf788cb3d0
parent ae11f7efda05dc568521924c890c80d0be908d43
author Jens Axboe <axboe@fb.com> 1433944880 -0600
committer Jens Axboe <axboe@fb.com> 1433944880 -0600

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

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>