linux-toradex.git/drivers/md/raid5.h, branch v3.0.3

md - remove old plugging code.

2011-04-18T08:25:42+00:00

md has some plugging infrastructure for RAID5 to use because the
normal plugging infrastructure required a 'request_queue', and when
called from dm, RAID5 doesn't have one of those available.

This relied on the ->unplug_fn callback which doesn't exist any more.

So remove all of that code, both in md and raid5.  Subsequent patches
with restore the plugging functionality.

Signed-off-by: NeilBrown

block: remove per-queue plugging

2011-03-10T07:52:07+00:00

Code has been converted over to the new explicit on-stack plugging,
and delay users have been converted to use the new API for that.
So lets kill off the old plugging along with aops->sync_page().

Signed-off-by: Jens Axboe

md: implment REQ_FLUSH/FUA support

2010-09-10T10:35:38+00:00

This patch converts md to support REQ_FLUSH/FUA instead of now
deprecated REQ_HARDBARRIER.  In the core part (md.c), the following
changes are notable.

* Unlike REQ_HARDBARRIER, REQ_FLUSH/FUA don't interfere with
  processing of other requests and thus there is no reason to mark the
  queue congested while FLUSH/FUA is in progress.

* REQ_FLUSH/FUA failures are final and its users don't need retry
  logic.  Retry logic is removed.

* Preflush needs to be issued to all member devices but FUA writes can
  be handled the same way as other writes - their processing can be
  deferred to request_queue of member devices.  md_barrier_request()
  is renamed to md_flush_request() and simplified accordingly.

For linear, raid0 and multipath, the core changes are enough.  raid1,
5 and 10 need the following conversions.

* raid1: Handling of FLUSH/FUA bio's can simply be deferred to
  request_queues of member devices.  Barrier related logic removed.

* raid5: Queue draining logic dropped.  FUA bit is propagated through
  biodrain and stripe resconstruction such that all the updated parts
  of the stripe are written out with FUA writes if any of the dirtying
  writes was FUA.  preread_active_stripes handling in make_request()
  is updated as suggested by Neil Brown.

* raid10: FUA bit needs to be propagated to write clones.

linear, raid0, 1, 5 and 10 tested.

Signed-off-by: Tejun Heo 
Reviewed-by: Neil Brown 
Signed-off-by: Jens Axboe

md/raid5: export raid5 unplugging interface.

2010-07-26T02:53:10+00:00

Also remove remaining accesses to ->queue and ->gendisk when ->queue
is NULL (As it is in a DM target).

Signed-off-by: NeilBrown

md/raid5: add simple plugging infrastructure.

2010-07-26T02:53:08+00:00

md/raid5 uses the plugging infrastructure provided by the block layer
and 'struct request_queue'.  However when we plug raid5 under dm there
is no request queue so we cannot use that.

So create a similar infrastructure that is much lighter weight and use
it for raid5.

Signed-off-by: NeilBrown

md/raid5: export is_congested test

2010-07-26T02:52:29+00:00

the dm module will need this for dm-raid45.

Also only access ->queue->backing_dev_info->congested_fn
if ->queue actually exists.  It won't in a dm target.

Signed-off-by: NeilBrown

md/raid5: ensure we create a unique name for kmem_cache when mddev has no gendisk

2010-07-26T02:52:26+00:00

We will shortly allow md devices with no gendisk (they are attached to
a dm-target instead).  That will cause mdname() to return 'mdX'.
There is one place where mdname really needs to be unique: when
creating the name for a slab cache.
So in that case, if there is no gendisk, you the address of the mddev
formatted in HEX to provide a unique name.

Signed-off-by: NeilBrown

md/raid5: factor out code for changing size of stripe cache.

2010-07-21T03:28:15+00:00

Separate the actual 'change' code from the sysfs interface
so that it can eventually be called internally.

Signed-off-by: NeilBrown

percpu: add __percpu sparse annotations to what's left

2010-02-17T02:17:38+00:00

Add __percpu sparse annotations to places which didn't make it in one
of the previous patches.  All converions are trivial.

These annotations are to make sparse consider percpu variables to be
in a different address space and warn if accessed without going
through percpu accessors.  This patch doesn't affect normal builds.

Signed-off-by: Tejun Heo 
Acked-by: Borislav Petkov 
Cc: Dan Williams 
Cc: Huang Ying 
Cc: Len Brown 
Cc: Neil Brown

md: fix problems with RAID6 calculations for DDF.

2009-10-16T05:27:34+00:00

Signed-off-by: NeilBrown