dm: submit stacked requests in irq enabled context

Browse source

Switch to having request-based DM enqueue all prep'ed requests into work
processed by another thread.  This allows request-based DM to invoke
block APIs that assume interrupt enabled context (e.g. blk_get_request)
and is a prerequisite for adding blk-mq support to request-based DM.

The new kernel thread is only initialized for request-based DM devices.

multipath_map() is now always in irq enabled context so change multipath
spinlock (m->lock) locking to always disable interrupts.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

...

This commit is contained in:

Keith Busch 2014-10-17 17:46:36 -06:00 • committed by Mike Snitzer

parent 1ae49ea2cf

commit 2eb6e1e3aa

2 changed files with 46 additions and 18 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

20

drivers/md/dm-mpath.c

View file

46

drivers/md/dm.c

View file