[LIP] Asynchronous IO in kernel space

Hi All,
I am writing a RAM Disk and it is a kernel module and I want to back up the 
RAM disk data in to a IDE/SCSI Disk.
As of now I am using the blockdevice calls
getblk();
then memcpy my buffer to the buffer received by my buffer
and then calling
ll_rw_block()
and waiting for the completion
There are two problems I am facing one
1. Unnecessarily I am using buffer cache and there is on additional mem copy
2. If some other applications issues open for that device node I am getting 
error
"Invalidate:Busy Buffer"
and write for few blocks are failing

Any suggestions for skipping buffer cache/ proper way to write buffers from 
kernel
I tried to follow the kiobuffer approach but in which my driver thread 
blocks for the end_io function to wake up but the end io is not at all 
getting called

Any help is appreciated

TIA
Sathya

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