linux-toradex.git/block/elevator.c, branch v2.6.16.9

[PATCH] block: implement elv_insert and use it (fix ordcolor flipping bug)

2006-02-08T15:52:58+00:00

q->ordcolor must only be flipped on initial queueing of a hardbarrier
request.

Constructing ordered sequence and requeueing used to pass through
__elv_add_request() which flips q->ordcolor when it sees a barrier
request.

This patch separates out elv_insert() from __elv_add_request() and uses
elv_insert() when constructing ordered sequence and requeueing.
elv_insert() inserts the given request at the specified position and
does nothing else.

Signed-off-by: Tejun Heo 
Acked-by: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] block: request_queue->ordcolor must not be flipped on SOFTBARRIER

2006-02-05T19:06:51+00:00

q->ordcolor must not be flipped on SOFTBARRIER.

Signed-off-by: Tejun Heo 
Acked-by: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[BLOCK] elevator: allow default scheduler to potentially be modular

2006-01-24T09:09:14+00:00

Jens has decided that allowing the default scheduler to be a module is
a bug, and should not be allowed under kconfig.  However, I find that
scenario useful for debugging, and wish for the kernel to be able to
handle this situation without OOPSing, if I enable such an option in
the .config directly.  This patch dynamically checks for the presence
of the compiled-in default, and falls back to no-op, emitting a
suitable error message, when the default is not available

Tested for a range of boot options on 2.6.16-rc1-mm2.

Signed-off-by: Nate Diller 
Signed-off-by: Jens Axboe

[BLOCK] elevator: default choice selection

2006-01-24T09:07:58+00:00

My previous default iosched patch did a poor job dealing with the
'elevator=' boot-time option.  The old behavior falls back to the
compiled-in default if the requested one is not registered at boot
time.  This patch dynamically evaluates which default
to use, and emits a suitable error message when the requested scheduler
is not available.  It also does the 'as' -> 'anticipatory' conversion
before elevator registration, which along with a modified registration
function, allows it to correctly indicate which default scheduler is
in use.

Tested for a range of boot options on 2.6.16-rc1-mm2.

Signed-off-by: Nate Diller 
Signed-off-by: Jens Axboe

[BLOCK] elevator: if specified scheduler is not found, fall back to default

2006-01-16T08:48:58+00:00

Signed-off-by: Jens Axboe

[BLOCK] elevator: Make elevator=as work again for anticipatory

2006-01-16T08:47:37+00:00

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Jens Axboe

[PATCH] fix queue stalling while barrier sequencing

2006-01-12T17:05:39+00:00

If ordered tag isn't supported, request ordering for barrier
sequencing is performed by queue draining, which basically hangs the
request queue until elv_completed_request() reports completion of all
previous fs requests.

The condition check in elv_completed_request() was only performed for
fs requests.  If a special request is queued between the last
to-be-drained request and the barrier sequence, draining is never
completed and the queue is stalled forever.

This patch moves the end-of-draining condition check such that it's
performed for all requests.

Signed-off-by: Tejun Heo 
Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

make elv_try_merge() static, kill the dead declaration of

2006-01-09T13:44:15+00:00

elv_try_last_merge().

Signed-off-by: Coywolf Qi Hunt 
Signed-off-by: Jens Axboe

[BLOCK] reimplement handling of barrier request

2006-01-06T08:51:03+00:00

Reimplement handling of barrier requests.

* Flexible handling to deal with various capabilities of
  target devices.
* Retry support for falling back.
* Tagged queues which don't support ordered tag can do ordered.

Signed-off-by: Tejun Heo 
Signed-off-by: Jens Axboe

[BLOCK] add @uptodate to end_that_request_last() and @error to rq_end_io_fn()

2006-01-06T08:49:03+00:00

add @uptodate argument to end_that_request_last() and @error
to rq_end_io_fn().  there's no generic way to pass error code
to request completion function, making generic error handling
of non-fs request difficult (rq->errors is driver-specific and
each driver uses it differently).  this patch adds @uptodate
to end_that_request_last() and @error to rq_end_io_fn().

for fs requests, this doesn't really matter, so just using the
same uptodate argument used in the last call to
end_that_request_first() should suffice.  imho, this can also
help the generic command-carrying request jens is working on.

Signed-off-by: tejun heo 
Signed-Off-By: Jens Axboe