Re: [PATCH v2 0/4] Write-hint for FS journal

Jan Kara
2019-01-28T12:47:13Z

On Fri 25-01-19 09:23:53, Keith Busch wrote:
> On Wed, Jan 09, 2019 at 09:00:57PM +0530, Kanchan Joshi wrote:
> > Towards supporing write-hints/streams for filesystem journal.
> >
> > Here is the v1 patch for background -
> > https://marc.info/?l=linux-fsdevel&m=154444637519020&w=2
> >
> > Changes since v1:
> > - introduce four more hints for in-kernel use, as recommended by Dave chinner
> > & Jens axboe. This isolates kernel-mode hints from user-mode ones.
>
> The nvme driver disables streams if the controller doesn't support
> BLK_MAX_WRITE_HINT number of streams, so this series breaks the feature
> for controllers that only support up to 4.

Right. Do you know if there are such controllers? Or are you just afraid
that there could be?

Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR