Re: [PATCH 0/4] New FC timeout handler

[Ren Mingxin <renmx@cn.fujitsu.com>]

Hi, Hannes:

On 05/24/2013 05:50 PM, Hannes Reinecke wrote:
> this is the first step towards a new FC error handler.
> This patch implements a new FC command timeout handler
> which will be sending command aborts inline without
> engaging SCSI EH.
>
> In addition the commands will be returned directly
> if the command abort succeeded, cutting down recovery
> times dramatically.

To the commands which can be aborted successfully, I guess your
patchset has solved the problem "the error handler can't even be
called until host_failed == host_busy", because it needn't to
wait for the scheduling of EH threads(without engaging SCSI EH
as you said) now, right?

> For any other return code from 'eh_abort_handler' the command
> will be pushed onto the existing SCSI EH handler, or aborted
> with an error if that fails.

To the commands which can NOT be aborted successfully, there is
not any improvements for the SCSI EH will be invoked as usual.
But should we consider the repetitive/time-consuming issue for
the commands will be tried to abort again in the SCSI EH handler?

Thanks,
Ren