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authorJens Axboe <axboe@fb.com>2015-06-10 08:01:20 -0600
committerJens Axboe <axboe@fb.com>2015-06-10 08:01:20 -0600
commit0bb979472a7401022109e81dd89d777adea58710 (patch)
tree27cf4730d269d037ad5b0db1f89d5ecf788cb3d0 /include/linux/elevator.h
parentae11f7efda05dc568521924c890c80d0be908d43 (diff)
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>
Diffstat (limited to 'include/linux/elevator.h')
-rw-r--r--include/linux/elevator.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 45a91474487d..638b324f0291 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -39,6 +39,7 @@ typedef void (elevator_deactivate_req_fn) (struct request_queue *, struct reques
typedef int (elevator_init_fn) (struct request_queue *,
struct elevator_type *e);
typedef void (elevator_exit_fn) (struct elevator_queue *);
+typedef void (elevator_registered_fn) (struct request_queue *);
struct elevator_ops
{
@@ -68,6 +69,7 @@ struct elevator_ops
elevator_init_fn *elevator_init_fn;
elevator_exit_fn *elevator_exit_fn;
+ elevator_registered_fn *elevator_registered_fn;
};
#define ELV_NAME_MAX (16)