Re: [dm-devel] Re: [PATCH RFC 0/4] use scatter lists for all block pc requests and simplify hw handlers

[Michael Christie <michaelc cs wisc edu>]

Quoting Lars Marowsky-Bree <lmb suse de>:

> On 2005-06-05T11:41:46, christophe varoqui <christophe varoqui free fr>
> wrote:
> 
> > While the focus is in this area, I'd like to mention multipath tools
> > userland checkers will need to insert SG request on queue head (Ed
> > Gaggin will explain this at OLS). I guess the API is lacking there, and
> > would like to know if this feature is on your TODOs ...
> 
> It's on the TODO list. It's just not done yet. Essentially we need to be
> able to set BW_RW_FAILFAST from user-space for SGIO.
> 

Isn't this a seperate issue? It looks like the RHAT bugzilla asks to be able to
insert directly at the head of the queue so you do you not have to wait for
possibly a hundred IO to complete before the test IO. Setting failfast just
means in case of en error it will be returned faster (no wasting time
retying).


> This is Novell bugzilla #81694 and RHAT bugzilla #154436.
>