Re: [RFC] [PATCH] 2.5.35 patch for making DIO async

[Suparna Bhattacharya <suparna@in.ibm.com>]

On Wed, Sep 18, 2002 at 01:47:06PM -0700, Badari Pulavarty wrote:
> Ben,
> 
> aio_read/aio_write() are now working with a minor fix to fs/aio.c
> 
> io_submit_one():
> 	
> 	if (likely(EIOCBQUEUED == ret))
> 
> 		needs to be changed to
> 
> 	if (likely(-EIOCBQUEUED == ret))
> 		  ^^^
> 
> 
> I was wondering what happens to following case (I think this
> happend in my test program).
> 
> Lets say, I did an sys_io_submit() and my test program did exit().
> When the IO complete happend, it tried to do following and got
> an OOPS in aio_complete().
> 
> 	if (ctx == &ctx->mm->default_kioctx) { 
> 
> I think "mm" is freed up, when process exited. Do you think this is
> possible ?  How do we handle this ?

Do you see this only in the sync case ?
init_sync_iocb ought to increment ctx->reqs_active, so that
exit_aio waits for the iocb's to complete.

Regards
Suparna