[dm-devel] Re: [PATCH 6/7] blk_end_request: remove/unexport end_that_request_*

[Kiyoshi Ueda]

Hi,

On Tue, 4 Sep 2007 17:25:14 -0400, "Halevy, Benny" <bhalevy at panasas.com> wrote:
> We suspect we'll still need the extern entry points for handling the bidi 
> request in the scsi_io_completion() path as we only want to call
> end_that_request_chunk on req->next_rq and never
> end_that_request_last.
>  
> (see 
> http://www.bhalevy.com/open-osd/download/linux-2.6.23-rc2_and_iscsi-iscsi-2007_08_09/0005-SCSI-bidi-support.patch)

If this patch-set is merged, there may be other way to do that.

For tricky drivers, special interface, blk_end_request_callback(),
is added in the patch 5/7.
(http://marc.info/?l=linux-kernel&m=118860027714753&w=2)
Currently, only user of the interface is ide-cd (cdrom_newpc_intr()).
It needs to call only end_that_request_first() too.

With the patch 7/7, you can set your own handler in rq->end_io()
to complete the request by your own way.

Thanks,
Kiyoshi Ueda