linux.git/block/blk.h, branch v2.6.29

block: fix oops in blk_queue_io_stat()

2009-02-02T07:42:32+00:00

Some initial probe requests don't have disk->queue mapped yet, so we
can't rely on a non-NULL queue in blk_queue_io_stat(). Wrap it in
blk_do_io_stat().

Signed-off-by: Jens Axboe

cpumask: Replace cpu_coregroup_map with cpu_coregroup_mask

2008-12-26T11:53:43+00:00

cpu_coregroup_map returned a cpumask_t: it's going away.

(Note, the sched part of this patch won't apply meaningfully to the
sched tree, but I'm posting it to show the goal).

Signed-off-by: Rusty Russell 
Signed-off-by: Mike Travis 
Cc: Jens Axboe 
Cc: Ingo Molnar

block: remove __generic_unplug_device() from exports

2008-10-17T12:03:08+00:00

The only out-of-core user is IDE, and that should be using
blk_start_queueing() instead.

Signed-off-by: Jens Axboe

block: add fault injection mechanism for faking request timeouts

2008-10-09T06:56:17+00:00

Only works for the generic request timer handling. Allows one to
sporadically ignore request completions, thus exercising the timeout
handling.

Signed-off-by: Jens Axboe

block: unify request timeout handling

2008-10-09T06:56:13+00:00

Right now SCSI and others do their own command timeout handling.
Move those bits to the block layer.

Instead of having a timer per command, we try to be a bit more clever
and simply have one per-queue. This avoids the overhead of having to
tear down and setup a timer for each command, so it will result in a lot
less timer fiddling.

Signed-off-by: Mike Anderson 
Signed-off-by: Jens Axboe

block: add support for IO CPU affinity

2008-10-09T06:56:09+00:00

This patch adds support for controlling the IO completion CPU of
either all requests on a queue, or on a per-request basis. We export
a sysfs variable (rq_affinity) which, if set, migrates completions
of requests to the CPU that originally submitted it. A bio helper
(bio_set_completion_cpu()) is also added, so that queuers can ask
for completion on that specific CPU.

In testing, this has been show to cut the system time by as much
as 20-40% on synthetic workloads where CPU affinity is desired.

This requires a little help from the architecture, so it'll only
work as designed for archs that are using the new generic smp
helper infrastructure.

Signed-off-by: Jens Axboe

block: Block layer data integrity support

2008-07-03T11:21:13+00:00

Some block devices support verifying the integrity of requests by way
of checksums or other protection information that is submitted along
with the I/O.

This patch implements support for generating and verifying integrity
metadata, as well as correctly merging, splitting and cloning bios and
requests that have this extra information attached.

See Documentation/block/data-integrity.txt for more information.

Signed-off-by: Martin K. Petersen 
Signed-off-by: Jens Axboe

block: rename and export rq_init()

2008-04-29T12:48:55+00:00

This rename rq_init() blk_rq_init() and export it. Any path that hands
the request to the block layer needs to call it to initialize the
request.

This is a preparation for large command support, which needs to
initialize the request in a proper way (that is, just doing a memset()
will not work).

Signed-off-by: FUJITA Tomonori 
Cc: Jens Axboe 
Signed-off-by: Jens Axboe

proper prototype for blk_dev_init()

2008-03-04T10:28:29+00:00

This patch adds a proper prototye for blk_dev_init() in block/blk.h

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

block: ll_rw_blk.c split, add blk-merge.c

2008-01-29T20:55:12+00:00

Signed-off-by: Jens Axboe