[PATCH] uml: add host AIO support to block driver
commit09ace81c1d737bcbb2423db235ac980cac4d5de9
authorJeff Dike <jdike@addtoit.com>
Sat, 3 Sep 2005 22:57:46 +0000 (3 15:57 -0700)
committerLinus Torvalds <torvalds@evo.osdl.org>
Mon, 5 Sep 2005 07:06:23 +0000 (5 00:06 -0700)
treed31987b15d57429bd40843c02b2283b8e2d90cb0
parent75e5584c89d213d6089f64f22cd899fb172e4c95
[PATCH] uml: add host AIO support to block driver

This adds AIO support to the ubd driver.

The driver breaks a struct request into IO requests to the host, based on the
hardware segments in the request and on any COW blocks covered by the request.

The ubd IO thread is gone, since there is now an equivalent thread in the AIO
module.

There is provision for multiple outstanding requests now.  Requests aren't
retired until all pieces of it have been completed.  The AIO requests have a
shared count, which is decremented as IO operations come in until it reaches
0.  This can be possibly moved to the request struct - haven't looked at this
yet.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
arch/um/drivers/Makefile
arch/um/drivers/ubd_kern.c
arch/um/include/aio.h
arch/um/os-Linux/aio.c