linux-stable.git/block/elevator.c, branch linux-2.6.25.y

elevator: make elevator_get() attempt to load the appropriate module

2008-02-19T09:20:37+00:00

Currently we fail if someone requests a valid io scheduler, but it's
modular and not currently loaded. That can happen from a driver init
asking for a different scheduler, or online switching through sysfs
as requested by a user.

This patch makes elevator_get() request_module() to attempt to load
the appropriate module, instead of requiring that done manually.

Signed-off-by: Jens Axboe

block: make elevator lib checkpatch compliant

2008-02-01T08:26:33+00:00

Signed-off-by: Jens Axboe

block: implement drain buffers

2008-01-28T09:54:11+00:00

These DMA drain buffer implementations in drivers are pretty horrible
to do in terms of manipulating the scatterlist.  Plus they're being
done at least in drivers/ide and drivers/ata, so we now have code
duplication.

The one use case for this, as I understand it is AHCI controllers doing
PIO mode to mmc devices but translating this to DMA at the controller
level.

So, what about adding a callback to the block layer that permits the
adding of the drain buffer for the problem devices.  The idea is that
you'd do this in slave_configure after you find one of these devices.

The beauty of doing it in the block layer is that it quietly adds the
drain buffer to the end of the sg list, so it automatically gets mapped
(and unmapped) without anything unusual having to be done to the
scatterlist in driver/scsi or drivers/ata and without any alteration to
the transfer length.

Signed-off-by: James Bottomley 
Signed-off-by: Jens Axboe

Kobject: rename kobject_init_ng() to kobject_init()

2008-01-25T04:40:38+00:00

Now that the old kobject_init() function is gone, rename
kobject_init_ng() to kobject_init() to clean up the namespace.

Cc: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

Kobject: rename kobject_add_ng() to kobject_add()

2008-01-25T04:40:38+00:00

Now that the old kobject_add() function is gone, rename kobject_add_ng()
to kobject_add() to clean up the namespace.

Cc: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

Kobject: convert block/elevator.c to use kobject_init/add_ng()

2008-01-25T04:40:36+00:00

This converts the code to use the new kobject functions, cleaning up the
logic in doing so.

Cc: Jens Axboe 
Cc: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

block: let elv_register() return void

2007-12-18T07:29:28+00:00

elv_register() always returns 0, and there isn't anything it does where
it should return an error (the only error condition is so grave that
it's handled with a BUG_ON).

Signed-off-by: Adrian Bunk 
Signed-off-by: Jens Axboe

fix typo "insted" -> "instead"

2007-10-19T23:55:04+00:00

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Adrian Bunk

block: Initial support for data-less (or empty) barrier support

2007-10-16T09:03:56+00:00

This implements functionality to pass down or insert a barrier
in a queue, without having data attached to it. The ->prepare_flush_fn()
infrastructure from data barriers are reused to provide this
functionality.

Signed-off-by: Jens Axboe

block: add end_queued_request() and end_dequeued_request() helpers

2007-10-16T09:03:53+00:00

We can use this helper in the elevator core for BLKPREP_KILL, and it'll
also be useful for the empty barrier patch.

Signed-off-by: Jens Axboe