linux-stable.git/block/elevator.c, branch v4.11.2

block: respect BLK_MQ_F_NO_SCHED

2017-04-19T20:15:43+00:00

If one driver claims that it doesn't support io scheduler via
BLK_MQ_F_NO_SCHED, we should not allow to change and show the
availabe io schedulers.

This patch adds check to enhance this behaviour.

Signed-off-by: Ming Lei 
Signed-off-by: Jens Axboe

blk-mq-sched: fix crash in switch error path

2017-04-07T14:56:48+00:00

In elevator_switch(), if blk_mq_init_sched() fails, we attempt to fall
back to the original scheduler. However, at this point, we've already
torn down the original scheduler's tags, so this causes a crash. Doing
the fallback like the legacy elevator path is much harder for mq, so fix
it by just falling back to none, instead.

Signed-off-by: Omar Sandoval 
Signed-off-by: Jens Axboe

blk-mq-sched: refactor scheduler initialization

2017-04-07T14:56:44+00:00

Preparation cleanup for the next couple of fixes, push
blk_mq_sched_setup() and e->ops.mq.init_sched() into a helper.

Signed-off-by: Omar Sandoval 
Signed-off-by: Jens Axboe

block: don't call ioc_exit_icq() with the queue lock held for blk-mq

2017-03-02T20:59:08+00:00

For legacy scheduling, we always call ioc_exit_icq() with both the
ioc and queue lock held. This poses a problem for blk-mq with
scheduling, since the queue lock isn't what we use in the scheduler.
And since we don't need the queue lock held for ioc exit there,
don't grab it and leave any extra locking up to the blk-mq scheduler.

Reported-by: Paolo Valente 
Tested-by: Paolo Valente 
Reviewed-by: Omar Sandoval 
Signed-off-by: Jens Axboe

block: get rid of blk-mq default scheduler choice Kconfig entries

2017-02-22T20:19:45+00:00

The wording in the entries were poor and not understandable
by even deities. Kill the selection for default block scheduler,
and impose a policy with sane defaults.

Architected-by: Linus Torvalds 
Reviewed-by: Omar Sandoval 
Signed-off-by: Jens Axboe

Merge branch 'for-4.11/next' into for-4.11/linus-merge

2017-02-17T21:08:19+00:00

Signed-off-by: Jens Axboe

elevator: fix loading wrong elevator type for blk-mq devices

2017-02-14T15:16:41+00:00

The old elevator= boot parameter blindly attempts to load the
same scheduler for mq and !mq devices, leading to a crash if
we specify the wrong one.

Ensure that we only apply this boot parameter to old !mq devices.

Signed-off-by: Jens Axboe

block: enumify ELEVATOR_*_MERGE

2017-02-08T20:43:06+00:00

Switch these constants to an enum, and make let the compiler ensure that
all callers of blk_try_merge and elv_merge handle all potential values.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

blk-mq-debug: Avoid that sparse complains about req_flags_t usage

2017-02-01T19:22:23+00:00

Avoid that sparse reports the following complaints:

block/elevator.c:541:29: warning: incorrect type in assignment (different base types)
block/elevator.c:541:29:    expected bool [unsigned] [usertype] next_sorted
block/elevator.c:541:29:    got restricted req_flags_t

block/blk-mq-debugfs.c:92:54: warning: cast from restricted req_flags_t

Signed-off-by: Bart Van Assche 
Reviewed-by: Omar Sandoval 
Signed-off-by: Jens Axboe

block: introduce blk_rq_is_passthrough

2017-01-31T21:00:34+00:00

This can be used to check for fs vs non-fs requests and basically
removes all knowledge of BLOCK_PC specific from the block layer,
as well as preparing for removing the cmd_type field in struct request.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe